Sunday, May 20, 2018

BRIEF HISTORY OF CNC MACHINING

Before CNC machining was invented, all metalworking fabrication processes were completed with NC (Numerical Controlled) machines. The concept of was introduced in 1967 but the first CNC machines were introduced in 1976. Since then the popularity of CNC grew very significant and it was recognized as the industry standard in 1989. Today, we will tell you the brief history of CNC machining.
In 1948, representatives of the US Air Force (USAF) visited the Parsons Corp. headquarters and Parsons was awarded a contract to make new and innovative wing designs for military applications. This, in turn, led to a series of USAF research projects at the Massachusetts Institute of Technology (MIT) Servomechanisms Laboratory, culminating in the construction of the very first numerically-controlled, albeit awkward, machine prototype. To accomplish this, Parsons purchased a Cincinnati DK Series, 28-inch Hydro-tel verticle-spindle contour milling machine consisting of a table and spindle that moved along X, Y and Z-axes. Over the next two years, the Cincinnati was disassembled, significantly modified, retrofitted, and reassembled. As application studies proceeded, the prototype was augmented to produce a motion of the head, table, or cross-slide to within 0.0005″ for each electrical impulse fed by the director. To ensure the prototype was functioning as instructed, a feedback system was added. In response to movement, synchronous motors geared to each motion produced voltage. This voltage was sent back to the detector for comparison to the original command voltage.
By 1953, enough data had been culled to suggest practical, aeronautic applications, and the Cincinnati prototype, which employed a Friden Flexowriter with its 8-column paper tape, tape reader, and vacuum-tube control system, became the de facto prototype for all successive developments. To this day all CNC controlled machines, even the most sophisticated still require three basic systems to operate: a command function system, a drive/motion system, and a feedback system.
Although CNC gained slow acceptance throughout the ’50s, in 1958 MIT Servomechanisms Laboratory developed g-code, which has become the most universally used operating language for CNC devices.
In the early ’60’s the Electronic Industry Alliance (EIA) standardized g-code and computer-aided design (CAD) became a nascent technology providing a firmer technology foundation. As a result, CNC soared and began steadily supplanting older technologies.
By the ’70s, minicomputers such as the DEC PDP-8 and the Data General Nova made CNC machines more powerful and cost-effective. US companies responsible for the CNC revolution, focused on high-end equipment. German and Japanese companies sensing the need, began producing smaller, less expensive CNCs, and since 1979 they have been outselling the United States.
Finally, PCs have now made CNC controls even cheaper, making way for the use CNC-controlled machines for the hobby and general purpose markets. CNC control language now known as LinuxCNC (formerly known as Enhanced Machine Controller, or EMC2) continues to thrive, as are many other CNC technologies.

JasonMould is one of the best plastic injection molding makers that offer great services to their clients when it comes to manufacturing advanced molding tools. They export their tools to different parts of the world and have become one of the most famous names in the industrial sector.
Inquiry Contact:
Contact person: James Yuan
Company name: JasonMould Industrial Company Limited
Address: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China
Telephone: 86-752-6682869

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UNDERSTANDING WITH THE INJECTION MOLDING PROCESS

With the use of injection molding presses and high-performance resins, plastic injection molders are able to craft a broad range of quality custom parts. Just as all resins are unique, these sophisticated machines offer varied capabilities and performance options depending on press size and type.
To ensure optimal quality and value, it’s critical to partner with a manufacturer who can provide the right size press for your specific needs.
How Are Plastic Injection Molding Presses Rated?
An experienced plastic injection molder can help you select the correctly sized machine for your project, and will be able to provide you with an accurate size estimate right from the start based on a few key pieces of information.
Presses are rated, or classified, based on tonnage, which indicates how much clamping pressure a particular machine can offer. Press tonnage, or force, can range from less than 5 tons to over 4,000 tons. The higher a machines tonnage is rated, the larger it is.
Many plastic injection molders provide a list of molding equipment used in their facilities on their websites, along with each machines’ tonnage capabilities.
How Much Clamping Force Do I Need?
Pressure keeps a mold closed during the injection process; too much or too little can compromise quality and result in flashing — the appearance of excess material on the part edge. To determine the appropriate size press for your application, consider the following key variables:
  • Press rating— A machine with a 68-ton rating, for instance, will be able to deliver 68 tons of clamping pressure, or force. 
  • Material choice and MFI— The melt flow index (MFI) of plastic, or melt flow rate (MFR), indicates the ease of flow of a molten plastic material. A high MFI will require more pressure than a low MFI.
  • Size— The size of the part will naturally affect the size of the machine needed. Many calculations include platen size in addition to mold and part size.
  • Safety factor— A numerical percentage incorporated into size calculations to help avoid defects in the final part, the safety factor acts as a buffer; some experts recommend adding 10% to the overall press size estimate.

For most projects, we recommend calculating required machine size using 2.5 times the surface square inches of the part and incorporating the 10% safety factor. So for example, a part with 42 square inches would need a press size with 105 tons of pressure.  If you add 10% for a safety factor, you will need to use a press with a minimum of 115 tons of clamping force.  A press size of 120 tons would be able to accommodate this plastic injection molded product.
Partnering With a Plastic Injection Molder
Once you have an accurate press size estimate, you can start looking for a manufacturer; generally, molders with a variety of press sizes at their disposal will be able to accommodate a wider range of project requirements. And if your project doesn’t have a completed mold from the start, it’s best to work with a company that excels at injection molding design and building a mold based on exact specifications; this will help ensure efficient, seamless operations and secure communication among all external and internal team members.
At The Rodon Group, our 125,000-square-foot manufacturing plant is home to 117 state-of-the-art injection molding presses, all highly automated, fully robotic, and microprocessor-controlled for industry-leading quality and precision.
To learn more about the plastic injection molding process, download our free eBook, “An Introduction to Plastic Injection Molding.”

About JasonMould Industrial Company Limited
Jasonmould is a manufacturer of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer- plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.

For more about custom manufacturer of plastic molding products,please visit https://www.jasonmolding.com/
Contact:
Contact person: James Yuan
Company name: JasonMould Industrial Company Limited
Address: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China
Telephone: 86-752-6682869

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Wednesday, May 2, 2018

THE STATUS OF MOULD IN PROCESSING INDUSTRY

A mold is a tool that uses its particular shape to shape a product of a certain shape and size. A variety of molds are widely used in various material processing industries. For example, the sand or die-casting mould used in metal casting, forging die for metal pressure processing, cold die and so on.
The overall requirement of the mould is that it can produce the public products which meet the requirements in dimension precision, appearance, physical properties and so on. From the angle of mould use, it requires high efficiency and simple automatic operation, and from the angle of mould manufacture, it requires reasonable structure, easy manufacture and low cost.
The mold affects the quality of the product. First, the shape, size, surface finish, surface finish, the position of the gate and the exhaust groove and the mode of demoulding, as well as the physical properties of the parts, the mechanical properties, the electrical performance, the internal stress size, the isotropy, the appearance quality, the surface finish, the bubble, and so on. Indentation, scorching, and silvery are very important. Secondly, in the process of processing, the structure of the mold has a great influence on the operation. In the mass production of plastic products, it is necessary to minimize the opening of the mould, the process of closing the mould and the manual labor in the process of taking the parts. It is also necessary to ensure that the products can be automatically removed from the mold. In addition, the mold has an impact on the cost of the products. When the batch is not large, the cost of the mold will be very large in the cost of the parts. At this time, a reasonable and simple mold should be used as much as possible to reduce the cost.
In modern production, reasonable processing technology, efficient equipment and advanced mould are three essential factors, especially the mold plays an important role in realizing the requirement of material processing, the application requirement of plastic parts and the modeling design. Efficient automatic equipment can play its role only if the mould can be automatically produced. The production and renewal of the products are based on the manufacturing and updating of the mould. Because of the great demand for product variety and production, the mould is required more and more. Therefore, to promote the continuous development of the mold.

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