Plasma cutting

Feb 22, 2010 at 07:57 o\clock

History of Tube forming manufacturers

by: sanben   Keywords: Tube, forming, manufacturers

The Company was registered as Tube Investments in 1919 combining the seamless steel Spiral Tubeformer businesses of Tubes Limited, New Credenda Tube (later known as Creda), Simplex and Accles & Pollock. In 1928 Reynolds Tube joined the Group.

In 1928 Ivan Stedeford joined the Company: he became Chief Executive in 1935 and Chairman in 1944. In 1946, the Company bought Swallow Coachbuilding Co. (1935) Ltd.

In 1946 The British Cycle Corporation subsidiary was formed which eventually composed of the following cycle companies: Phillips Cycles, Hercules Cycles (No connection with the German Hercules company), Armstrong, Rudge-Whitworth, Norman Cycles and Sun Cycles.

The period 1958/9 saw the Aluminium War when the Company fought a fierce and ultimately successful battle to acquire British Aluminium.

In 1960 Raleigh Industries joined the group bringing with it BSA Cycles and J. B. Brookes.

In 1963 the Company bought Russell Hobbs, kettle manufacturers and Sir Ivan Stedeford GBE retired as Chairman and CEO and assumed the title of Life President.

Alfred Herbert Ltd was purchased in 1982.

In 1987 Raleigh was sold to Derby International and Creda was sold to GEC.

Dowty Group was purchased in 1992 and in 1996 Accles & Pollock was sold to Hay Hall Group.

On 18 September 2000 Smiths Group announced its intention to merge with TI Group. The merger was completed on 4 December 2000. Smiths divested TI's automotive business shortly after the merger.
The three major divisions were John Crane International, a manufacturer of mechanical seals, Bundy Corporation, a Tube forming manufacturer and supplier to the refrigeration and automotive industries, and Dowty Group plc, an aerospace company. The Group also owned TI Creda, a manufacturer of domestic cookers. It also owned TI Chesterfield Cylinders, a manufacturer of pressurised gas cylinders for companies such as BOC and Air Products: the business was sold and the factory relocated from Chesterfield to Sheffield.

 

 

 

•  Special mould for various tube diameters, very easy to change and adjust, no need crane or too much manpower
•  Large diameter range
•  High speed synchro flying plasma cutting machine system
•  PLC control, convenient operation
•  Light and small, site work
•  Perfect swage, without leakage 

Main Technical Date:
Diameter range
Φ80-Φ1500mm
Tube Length
120-8000mm
Thickness of Strip
0.4-1.2mm
Width of Strip
137-140mm
Strip Speed
1-38/min
Dimension (L x W x H):
2650*1550*2000mm
Lockseam
Outside tube,on the inside on request
Weight
2200kg
Control System
PLC automatic control
Compressed air power
0.5-0.7kmp
Electrical
380V/3PH/50HZ
(Acorrding to customer’s request)
Main Motor Power
5.5kw
The power of cutting motor
4kw
Suitable Material
Aluminum, Stainless steel, Galvanized steel

 

 

from:answers

Feb 22, 2010 at 07:34 o\clock

Parsons and the invention of NC(Plasma Cutter)

by: sanben   Keywords: Plasma, Cutting, Machine

The birth of NC is generally credited to John T. Parsons, a machinist and salesman at his father's machining company, Parsons Corp. In 1942 he was told that helicopters were going to be the "next big thing" by the former head of Ford Trimotor production, Bill Stout. He called Sikorsky Aircraft to inquire about possible work, and soon got a contract to build the wooden stringers in the rotor blades. After setting up production at a disused furniture factory and ramping up production, one of the blades failed and it was traced to the spar. As at least some of the problem appeared to stem from spot welding a metal collar on the stringer to the metal spar, so Parsons suggested a new method of attaching the stringers to the spar using adhesives, never before tried on an aircraft design.

But that development led Parsons to wonder about the possibility of using stamped metal stringers instead of wood, which would be much easier to make and stronger too. The stringers for the rotors were built to a design provided by Sikorsky, which was sent to them as a series of 17 points defining the outline. Parsons then had to "fill in" the dots with a french curve to generate an outline they could use as a template to build the jigs for the wooden versions. But how to make a Plasma Cutting Machine able to cut metal with that shape was a much harder problem. Parsons went to visit Wright Field to see Frank Stulen, who was the head of the Rotary Ring Branch at the Propeller lab. Stulen concluded that Parsons didn't really know what he was talking about, and realizing this, Parsons hired him on the spot. Stulen started work on 1 April 1946 and hired three new engineers to join him.

Stulen's brother worked at Curtis Wright Propeller, and mentioned that they were using punch card calculators for engineering calculations. Stulen decided to adopt the idea to run stress calculations on the rotors, the first detailed automated calculations on helicopter rotors. When Parsons saw what Stulen was doing with the punch card machines, he asked him if they could be used to generate an outline with 200 points instead of the 17 they were given, and offset each point by the radius of the cnc plasma cutter   on a mill. If you cut at each of those points, it would produce a relatively accurate cutout of the stringer even in hard steel, and it could easily be filed down to a smooth shape. The resulting tool would be useful as a template for stamping metal stringers. Stullen had no problem doing this, and used the points to make large tables of numbers that would be taken onto the machine floor. Here, one operator read the numbers off the charts to two other operators, one on each of the X- and Y- axes, and they would move the cutting head to that point and make a cut. This was called the "by-the-numbers method".

At that point Parsons conceived of a fully automated tool. With enough points no manual working would be needed at all, but with manual operation the time saved by having the part more closely match the outline was offset by the time needed to move the controls. If the machine's inputs were attached directly to the card reader this delay, and any associated manual errors, would be removed and the number of points could be dramatically increased. Such a machine could repeatedly punch out perfectly accurate templates on command. But at the time he had no funds to develop these ideas.

When one of Parsons's salesmen was on a visit to Wright Field, he was told of the problems the newly-formed US Air Force was having with new jet designs. He asked if Parsons had anything to help them. Parsons showed Lockheed their idea of an automated mill, but they were uninterested. They had already decided to use 5-axis template copiers to produce the stringers, cutting from a metal template, and had ordered the expensive cnc plasma cutting machine already. But as Parsons noted:

    Now just picture the situation for a minute. Lockheed had contracted to design a machine to make these wings. This machine had five axes of cutter movement, and each of these was tracer controlled using a template. Nobody was using my method of making templates, so just imagine what chance they were going to have of making an accurate airfoil shape with inaccurate templates.

Parsons worries soon came true, and in 1949 the Air Force arranged funding for Parsons to build his machines on his own. Early work with Snyder Machine & Tool Corp proved that the system of directly driving the controls from motors failed to have the accuracy needed to set the machine for a perfectly smooth cut. Since the mechanical controls did not respond in a linear fashion, you couldn't simply drive it with a certain amount of power, because the differing forces would mean the same amount of power would not always produce the same amount of motion in the controls. No matter how many points you included, the outline would still be rough.

This was not an impossible problem to solve, but would require some sort of feedback system, like a selsyn, to directly measure how far the controls had actually turned. Faced with the daunting task of building such a system, in the spring of 1949 Parsons turned to Gordon S. Brown's Servomechanisms Laboratory at MIT, which was a world leader in mechanical computing and feedback systems. During the war the Lab had built a number of complex motor-driven devices like the motorized gun turret systems for the B-29 and the automatic tracking system for the SCR-584 radar. They were naturally suited to technological transfer into a prototype of Parsons's automated "by-the-numbers" machine.

The MIT team was led by William Pease assisted by James McDonough. They quickly concluded that Parsons's design could be greatly improved; if the machine did not simply cut at points A and B, but instead moved smoothly between the points, then not only would it make a perfectly smooth cut, but could do so with many fewer points - the mill plasma cutting lines directly instead of having to define a large number of cutting points to "simulate" it. A three-way agreement was arranged between Parsons, MIT, and the Air Force, and the project officially ran from July 1949 to June 1950.[6] The contract called for the construction of two "Card-a-matic Milling Machine"s, a prototype and a production system. Both to be handed to Parsons for attachment to one of their mills in order to develop a deliverable system for cutting stringers.

Instead, in 1950 MIT bought a surplus Cincinnati Milling Machine Company "Hydro-Tel" mill of their own and arranged a new contract directly with the Air Force that froze Parsons out of further development. Parsons would later comment that he "never dreamed that anybody as reputable as MIT would deliberately go ahead and take over my project." In spite of the development being handed to MIT, Parsons filed for a patent on "Motor Controlled Apparatus for Positioning Machine Tool" on 5 May 1952, sparking a filing by MIT for a "Numerical Control Servo-System" on 14 August 1952. Parsons received US Patent 2,820,187 on 14 January 1958, and the company sold an exclusive license to Bendix. IBM, Fujitsu and General Electric all took sub-licenses after having already started development of their own devices.

 

 

from:wiki

Feb 9, 2010 at 04:12 o\clock

Materials for flanges are usually under ASME designation

by: sanben   Keywords: flanges, machine

A flange is an external or internal rib, or rim (lip), for strength, as the flange of an iron beam or I-beam (or a T-beam); or for a guide, as the flange of a train wheel; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc, or on the lens mount of a camera. Thus a flanged rail is a rail with a flange on one side to keep wheels, etc., from running off. The term "flange" is also used for a kind of tool used to form flanges. By using flanges, pipes can be assembled or disassembled very easily.

Although flanging machine generally refers to the actual raised rim or lip of a fitting, many flanged plumbing fittings are themselves known as 'flanges':
Surrey Flange

Common flanges used in plumbing are the Surrey flange or Danzey flange, York flange, Sussex flange and Essex flange. Surrey and York flanges fit to the top of the hot water tank allowing all the water to be taken without disturbance to the tank. They are often used to ensure an even flow of water to showers. An Essex flange requires a hole to be drilled in the side of the tank.

There is also a Warix flange which is the same as a York flange but the shower output is on the top of the flange and the vent on the side. The York and Warix flange have female adapters so that they fit onto a male tank, whereas the Surrey flange connects to a female tank.

A closet flange machine provides the mount for a toilet.
There are many different flange standards to be found worldwide. To allow easy functionality and inter-changeability, these are designed to have standardised dimensions. Common world standards include ASA/ANSI (USA)see, PN/DIN (European), BS10 (British/Australian), and JIS/KS (Japanese/Korean).

ANSI designations such as ANSI 150, ANSI 300 and so on are often followed by a # (hash symbol). The ANSI number does not directly relate to a pressure rating, but to a class of flange. For example, the hash (#) or 'pound' reference; e.g. 300 pound, can be misleading in that an ANSI 300 flange is actually rated for a test pressure of 740 psi (~5100 kPa), and only within a certain working temperature range (-20 to 100 deg F.)

In most cases these are not interchangeable (e.g. an ANSI flange will not mate against a JIS flange). Further many of the flanges in each standard are divided into "pressure classes", allowing flanges to be capable of taking different pressure ratings. Again these are not generally interchangeable (e.g. an ANSI 150 will not mate with an ANSI 300). These "pressure classes" also have differing pressure and temperature ratings for different materials. "Pressure Classes" of piping are usually developed for a process plant or power generating station; these "pressure classes" may be unique to the specific corporation, Engineering Procurement and Construction (EPC) contractor, or the process plant owner.

The flange faces are made to standardized dimensions and are typically "flat face", "raised face", "tongue and groove", or "ring joint" styles, although other obscure styles are possible.

Flange designs are available as "welding neck", "slip-on", "boss", "lap joint", "socket weld", "threaded", and also "blind".Pipe flanges that are made to standards called out by ASME B16.5 or ASME B16.47 are typically made from forged materials and have machined surfaces. B16.5 refers to nominal pipe sizes (NPS) from 1/2 to 24. B16.47 covers NPSs from 26 to 60. Each specification further delineates flanges into classes 150, 300, 400, 600, 900, 1500 and 2500 for B16.5. B16.47 delineates its flanges into classes 75, 150, 300, 400, 600, 900.

The gasket type and bolt type are generally specified by the standard(s); however, sometimes the standards refer to the ASME Boiler and Pressure Vessel Code (B&PVC) for details (see ASME Code Section VIII Division 1 - Appendix 2). These flange machine manufacturers are recognized by ASME Pipe Codes such as ASME B31.1 Power Piping, and ASME B31.3 Process Piping.

Materials for flanges are usually under ASME designation: SA-105 (Specification for Carbon Steel Forgings for Piping Applications) , SA-266 (Specification for Carbon Steel Forgings for Pressure Vessel Components) or SA-182 (Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service). In addition, there are many "industry standard" flanges that in some circumstance may be used on ASME work.
Flanges in other countries also are manufactured according to the standards for materials, pressure ratings, etc. Such standards include DIN, BS and/or ISO standards.A vacuum flange is a flange at the end of a tube used to connect vacuum chambers, tubing and vacuum pumps to each other.
In microwave telecommunications, a flange is a type of cable joint which allows different types of waveguide to connect.

Several different microwave RF flange types exist, such as CAR, CBR, OPC, PAR, PBJ, PBR, PDR, UAR, UBR, UDR, icp and UPX.

 

 

from:wiki

Feb 9, 2010 at 04:02 o\clock

Numerical control (NC) refers to the automation of machine tools

by: sanben   Keywords: CNC, plasma, cutter

Numerical control (NC) refers to the automation of machine tools that are operated by abstractly programmed commands encoded on a storage medium, as opposed to manually controlled via handwheels or levers, or mechanically automated via cams alone. The first NC machines were built in the 1940s and '50s, based on existing tools that were modified with motors that moved the controls to follow points fed into the system on paper tape. These early servomechanisms were rapidly augmented with analog and digital computers, creating the modern computer numerical controlled (CNC) machine tools that have revolutionized the design process.

In modern CNC plasma systems, end-to-end component design is highly automated using CAD/CAM programs. The programs produce a computer file that is interpreted to extract the commands needed to operate a particular machine, and then loaded into the CNC plasma cutter machines for production. Since any particular component might require the use of a number of different tools—drills, saws, etc.—modern machines often combine multiple tools into a single "cell". In other cases, a number of different machines are used with an external controller and human or robotic operators that move the component from machine to machine. In either case, the complex series of steps needed to produce any part is highly automated and produces a part that closely matches the original CAD design.

The automation of machine tool control began in the 1800s with cams that "played" a machine tool in the way that cams had long been playing musical boxes or operating elaborate cuckoo clocks. Thomas Blanchard built his gun-stock-copying lathes (1820s-30s), and the work of people such as Christopher Miner Spencer developed the turret lathe into the screw machine (1870s). Cam-based automation had already reached a highly advanced state by World War I (1910s).

However, automation via cams is fundamentally different from numerical control because it cannot be abstractly programmed. There is no direct connection between the design being produced and the Plasma Cutting Machine steps needed to create it. Cams can encode information, but getting the information from the abstract level of an engineering drawing into the cam is a manual process that requires sculpting and/or machining and filing. At least two forms of abstractly programmable control had existed during the 1800s: those of the Jacquard loom and of mechanical computers pioneered by Charles Babbage and others. These developments had the potential for convergence with the automation of machine tool control starting in that century, but the convergence did not happen until many decades later.

The application of hydraulics to cam-based automation resulted in tracing CNC plasma cutting machines that used a stylus to trace a template, such as the enormous Pratt & Whitney "Keller Machine", which could copy templates several feet across.Another approach was "record and playback", pioneered at General Motors (GM) in the 1950s, which used a storage system to record the movements of a human machinist, and then play them back on demand. Analogous systems are common even today, notably the "teaching lathe" which gives new machinists a hands-on feel for the process. None of these were numerically programmable, however, and required a master machinist at some point in the process, because the "programming" was physical rather than numerical.

One barrier to complete automation was the required tolerances of the machining process, which are routinely on the order of thousandths of an inch. Although it would be relatively easy to connect some sort of control to a storage device like punch cards, ensuring that the controls were moved to the correct position with the required accuracy was another issue. The movement of the tool resulted in varying forces on the controls that would mean a linear output would not result in linear motion of the tool. The key development in this area was the introduction of the servo, which produced highly accurate measurement information. Attaching two servos together produced a selsyn, where a remote servo's motions was accurately matched by another. Using a variety of mechanical or electrical systems, the output of the selsyns could be read to ensure proper movement had occurred.

The first serious suggestion that selsyns could be used for machining control was made by Ernst F. W. Alexanderson, a Swedish immigrant to the U.S. working at General Electric (GE). Alexanderson had worked on the problem of torque amplification that allowed the small output of a mechanical computer to drive very large motors, which GE used as part of a larger gun laying system for US Navy ships. Like machining, gun laying requires very high accuracies, less than a degree, and the motion of the gun turrets was non-linear. In November 1931 Alexanderson suggested to the Industrial Engineering Department that the same systems could be used to drive the inputs of machine tools, allowing it to follow the outline of a template without the strong physical contact needed by existing tools like the plasma cutting Machine . He stated that it was a "matter of straight engineering development." However, the concept was ahead of its time from a business development perspective, and GE did not take the matter seriously until years later, when others had pioneered the field.

 

 

from:wiki

Feb 2, 2010 at 06:07 o\clock

New machines and materials fuel prepackaged fresh beef

by: sanben   Keywords: rotary, machine

Many retailers envisioning the supermarket of the future are convinced that the fresh meat department will shift from a manufacturing and packaging department with some selling to a merchandising department with some trimming and repackaging. Prepackaged meats, ready for the display case, will play a big role in the transition. One company that's giving the concept a big push is Colorado Boxed Beef, Auburndale, FL, specifically with its case-ready, prepackaged ground beef. Through its senior vice president of finance and marketing, Steve Saterbo, CBB has invested in packaging materials from as far away as England and Japan along with new machine technology. Both create a prepackaged product with more than double the shelf life of most ground beef packaged at store level. CBB is a $700-million distributor of meats to retail and foodservice outlets in the Southeast. It projects that its ground beef program will reach $25 million in sales during its next fiscal year. After attending a packaging exposition in Europe a few years ago, Saterbo came away convinced that case-ready was "the way the industry is going to go." Developing a successful program at CBB, however, has not been easy. "We've done more R&D over the last few years than I want to talk about," says Saterbo.

 The firm even acquired its own supermarket in Groveland, FL, to test its case-ready beef program. "It was a good way to learn," says Saterbo of the now-closed store. "A tough experience, but valuable." The company's first efforts involved whole-muscle cuts of veal and lamb. But management quickly learned that the sales volume of those items was too low to return an acceptable profit. So about two years ago they refocused on high-volume ground beef and now run five ground beef packaging lines seven days a week. Packed in 1-, 2-, 3- and 5-lb weights, meat is formulated in five fat-to-lean ratios. How Kroger buys A key customer is Cincinnati-based Kroger's Atlanta division, which includes more than 150 stores. Individual stores send their ground beef requirements to division headquarters. That office sends the total order, five or six times weekly, to CBB via an EDI (electronic data interchange) link.

The next day, CBB fulfills the order and by about 7:00 p.m. the product is on its way. By 6:00 a.m. on Day 2 it reaches a central warehouse in Atlanta, where it's dispersed to individual stores, reaching them that same day or early on Day 3. Also, on a weekly basis, Kroger specifies the retail price per pound so CBB's plant can print and apply price labels. In turn this means that when the order arrives, the meat merchandisers need only open the shippers and stock the trays in the refrigerated meat display. CBB codes each price label with a seven-day sell-by date. Though the actual shelf life is ten days, says Saterbo, "That still gives the consumer three days in which to use the meat," he says. "It's important not to stretch your sell-by date to ten days. If you do, you leave no leeway for the consumer." Shelf life is that long thanks to high-barrier packaging materials and modified atmosphere packaging.

Each tray is backflushed with an 80/20 mix of oxygen and carbon dioxide. The carbon dioxide retards spoilage and the oxygen permits the meat to retain its bright red color. Continuous improvement Methods have evolved rapidly at CBB in just two short years. Take machines, for instance. "We used to take ground beef from the portioners and hand load it into trays," says processing plant manager Ed Baxter. "Now on our three high-speed lines we automatically load trays with beef." Materials have evolved, too, and they'll likely continue to do so. For now, at least, Saterbo is pleased with the preformed trays he gets from LinPac Plastics/Filmco (Ft. Lauderdale, FL) and the lidding material that comes from two sources: Cryovac (Duncan, SC) and Packaging Partners, Ltd. (Franklin, WI). Details on the makeup of the Cryovac material are unavailable from that converter. The other lidstock, says its supplier, is a seven-layer coextrusion called FreshWrap(TM) that's made in Japan. It has an oxygen transmission rate of 0.1 cc/100 sq"/24 hours.

Packaging Partners vice chairman Grover Foote declines to identify the Japanese converter that supplies the film. His firm has exclusive rights to market the material in Canada and the U.S. Although regularly used in Europe, especially in England, the material is just now making its mark here. Foote estimates some 15 applications are commercial in the U.S. Foote describes the lidding material as "essentially" nylon/ethylene vinyl alcohol/nylon/metallocene PE. Nylon gives the material toughness and puncture resistance and EVOH is for gas barrier. The inside layer of metallocene ensures seal strength. The material is coextruded to a thickness of 2 mils, then biaxially oriented in-line to a thickness of 1 mil. Orientation enhances barrier properties of the EVOH component, says Foote. It also gives the material memory, so when it's applied to a food tray it stays taut and wrinkle-free. And by way of England... While the multilayer lidstock from Packaging Partners hails from Japan, the LinPac tray used by CBB originates in England. Considering that such imports are typically more costly than materials sourced domestically, it seems odd they'd be used for ground beef, which is notorious for razor-thin profit margins.

The oddity is explained by the simple fact that these materials work well for CBB. Seal integrity, barrier properties, anti-fog properties, and other key performance characteristics are consistently on target. If such reliability requires imports, so be it, say Baxter and Saterbo, though both anticipate that domestic sources, maybe even plants run by the current suppliers, will be established in the next six months or so. While the LinPac tray is fabricated in the U.S., its barrier properties come from a five-layer coextruded film from Sidlaw Packaging (Hawkfield Way, Bristol, England). Called Baricol XPS45, the 45-micron (1.75-mil) film consists of polyethylene/ tie/EVOH/tie/proprietary sealant. The film is said to exhibit an oxygen transmission rate of 0.66 cc/sq m/24 hours. This film is shipped to LinPac's manufacturing plant in Wilson, NC. It's laminated to expanded polystyrene sheet that's produced there. Thermoforming follows. No details on the barrier characteristics of the finished tray were available. A key feature to the LinPac tray is its flange. According to Baxter, other barrier foam trays have a much wider flange so that the lidding material has plenty of surface area to grab on to when it's heat-sealed to the tray. But the wider flange makes the tray look different than conventional meat trays that are packed in-store. That was an issue since many consumers tend to believe products are fresher when packaged in-store.

The seal integrity of the lidding film to the 1/8" flange, Baxter says, has been perfectly acceptable. "Shelf life, burst strength, and other tests we've done have shown us this tray is up to the task," says Baxter. Another advantage of the tray is nearly vertical sidewalls. "The angle of the sidewall on other barrier foam trays is quite gradual," says Baxter. "With this nearly straight up-and-down design, you can put a pound of beef in a tray occupying twenty percent less space in the refrigerated case. And a smaller tray costs less, too." Rotary-style MAP system In CBB's plant, the newest development on the machinery side is the installation last fall of a rotary-style evacuation/backflush/lidding system from MAPfresh Inc. (Hilton Head, SC). The other four lines all have in-line systems. Baxter says it's a little early to pronounce final judgment on rotary vs in-line systems. But he does appreciate the speed of the rotary machine , which is rated at 70 packs/min. "We have it on cruise control at sixty-two packages per minute," says Baxter. Baxter also values the heavy-duty construction of the rotary machine , and that power is supplied primarily by servo motors. "You have fewer moving parts than with a chain-and-sprocket system," says Baxter. "Over time, the rotary machines may prove a better way to go. It may prove more durable." MAPfresh's Guy Foulkes says his firm has 16 patents on the T-300 machine running at CBB.

It's an intermittent-motion machine whose rotary platform is divided into four identical sections or carriers. Each carrier has cavities that hold trays of meat and take them through the gas-flushing and lidding process. Different sets of cavity tooling make it possible to hold as many as five 1-lb trays in each carrier. Carriers hold fewer trays when larger portions are being packed. So far CBB has used the T-300 exclusively for 1-lb trays. The beginning of the operation is automatic tray denesting by a Model 112 Portion-To-Pack system from Waldrup (Houston, TX). It uses rotary shafts to cleanly separate the bottom tray from its nested stack. Then a vacuum pick-up head reaches up, grabs the tray, and places it in a lugged conveyor. This conveyor has a 90o direction turn on its discharge end. Meanwhile, a vacuum stuffer/ portioner volumetrically dispenses 1-lb loaves of ground beef onto a declining belt conveyor. The conveyor is timed with the conveyor that delivers a tray just below the end of the belt carrying the meat. A loaf on the belt triggers a photocell that releases a tray to be in position for the meat to drop into it. The filled trays are conveyed toward the T-300 machine from MAPfresh. A "channelizer," or swing gate, directs the single-file trays out to one of five positions. When all five positions are filled, the five trays are pushed forward until they drop into the five cavities on the carrier plate.

Once meat trays are securely in the carrier, the table rotates first to an unused position, and then to the evacuation/backflush/lidding station. In the fourth and final station of the rotation, lidded trays are automatically lifted from their cavities and sent down a roller conveyor to labeling. Two labelers The first of two pressure-sensitive blow-down labelers on the line is an older model that was moved over from another line. It applies a paper pressure-sensitive label carrying the required nutrition statement, fat/lean ratio, and cut of meat (sirloin, chuck, etc.). "We've adopted a color-coding scheme on these labels that even our private-label customers are initiating," says Baxter. "It helps the shopper. If you like ground chuck, you get used to looking for an orange label. For ground round, it's blue." The second labeler, supplied by Bizerba (Piscataway, NJ), is a Model GS 7000 thermal-transfer weigh/ price unit that blows down a pressure-sensitive label carrying price per pound and unit price. Preprinted on this label are safe handling instructions. Between the two labelers is a metal detector from Advanced Detection (Milwaukee, WI).

Exiting the second labeler, packages drop onto a circular accumulation table. Three operators hand-pack finished packages of ground beef into corrugated shippers. The box size has been standardized for all tray sizes. It holds 18 1-lb, 12 2-lb, eight 3-lb, four 5-lb or 12 trays of patties. This shipper will be replaced soon, says Baxter, by a reusable plastic tote. Case labeling is done by hand using labels printed by a nearby thermal-transfer printer. Palletizing is done by hand, and the cases are stacked 10-high. Pallets go into a holding cooler, where temperatures are kept between 31o and 34oF. Product is shipped that night on one of CBB's 80 refrigerated tractor/trailers. Temperatures, says Saterbo, never go above 40oF. Now that CBB has established its case-ready ground beef program, will whole-muscle meats be next? Both Saterbo and Baxter indicate the answer is likely yes, though neither specifies a time frame. But if they do expand beyond ground beef and are successful with it, a contributing factor is sure to be their willingness to experiment. "We're always open to trying new materials and machines," says Baxter. "That's how we got to where we're at."

 

 

from:packworld

Feb 2, 2010 at 05:26 o\clock

The useful effect of CNC Router for projects

by: sanben   Keywords: CNC, Router

A CNC Router is used to make useful parts for projects or complete projects. A complete project can be a 3d caving. Parts of a project can be made and then assembled to produce a complete project like a robot.

The CNC router works like a printer. Work is composed on a computer and then the design or drawing is sent to the CNC router for the hard copy. This outputs a 3 dimensional copy of the work. The CNC router uses a cutting tool instead of an ink jet. The cutting tool is generally a router but other cutters can be used as well. The CNC router can be fitted with a laser, plasma torch, or knife.

The CNC Plasma Cutter works on the Cartesian coordinate system (X, Y, Z) for 3D motion control. CNC stands for computer numerically controlled cutting tool. This gives the computer a printer like ability to drive a CNC machine to make parts.

For engraving and general purpose cutting all that is needed is some material to engrave or cut on and an engraving or cutting tool bit.

A file of a picture or part has to be converted to g-code. Clamp the work piece down and then use the driver program to zero the CNC Plasma and run the g-code file. This will command the CNC to make the desired parts for you, quickly and accurately. Use it for all kinds of projects to make PCBs, gears, molds, etc.

The CNC Router is great for hobbies, engineering prototyping, product development, art, robotic education, and production work.

 

 

 

 

 

一.
The frame is of a steel welded construction, with a vibration treated coil to reduce internal stress , thus the frame is of good quality. X axis adopts high precision line cycle guide ,Y axis adopts high precision line guide which reduces moving resistance ,X and Y axis have been installed with high precision equipment ,in order to guarantee two guide line tolerance of X axis less than 0.05mm and vertical tolerance of X and Y axis less than 0.05mm .The industrial operation system works in DOS either in English or Chinese ,,which can be changed easily .The maximum work-speed of X axis and Y axis is 8m/min.The industrial computer uses standard CNC language and can be programmed.
二.
Utilizing a stable gasvalue for discharge and gun floating to make the movement more stable and reliable.
SBKJ-Plasma cutting machine has a machinery height adjustment device,The torch gun has a float device which can adjust the height of the gun according to the sheet’s level thus keeping the distance between the sheet and the gun constant.
SBKJ Plasma Cutting Machine system includes a upper main computer and a high efficient industrial computer control system. Upper main computer uses a DELL LCD and CPU utilizes intel Petium(1GHz);The industrial computer control system utilizes a MISUBISHI servomotor system with industrial control software and a high clarity LCD. To connect them, a advanced communication system and composing software are used.
SBPC-3100 has American HUPERTHERM plasma unit.

 

 

from:townhall|cnc plasma