Frame of indoor plastic auto parts with cold runner multi gate

Frame of indoor Automotive injection parts with cold runner multi gate

Specifications:

Description

Injection Molding

Design Guideline

Injection molding is used for manufacturing a wide variety of parts, from small components like AAA battery boxes to large components like truck body panels. Once a component is designed, a mold is made and precision machined to form the features of the desired part. The injection molding takes place when a thermoplastic or thermoset plastic material is fed into a heated barrel, mixed, and forced into the metal mold cavity where it cools and hardens before being removed.

TOOLING

Mold and die are used interchangeably to describe the tooling applied to produce plastic parts. They are typically constructed from pre-hardened steel, hardened steel, aluminum, and/or beryllium-copper alloy. Of these materials, hardened steel molds are the most expensive to make, but offer the user a long lifespan, which offsets the cost per part by spreading it over a larger quantity. For low volumes or large components, pre-hardened steel molds provide a less wear-resistant and less expensive option.

The most economical molds are produced out of aluminum. When designed and built using CNC machines or Electrical Discharge Machining processes, these molds can economically produce tens of thousands to hundreds of thousands of parts. Note that beryllium copper is often used in areas of the mold that require fast heat removal or places that see the most shear heat generated.

INJECTION MOLDING

The injection molding process uses a granular plastic that is gravity fed from a hopper. A screw-type plunger forces the material into a heated chamber, called a barrel, where it is melted. The plunger continues to advance, pushing the polymer through a nozzle at the end of the barrel that is pressed against the mold. The plastic enters the mold cavity through a gate and runner system. After the cavity is filled, a holding pressure is maintained to compensate for material shrinkage as it cools. At this same time, the screw turns so that the next shot is moved into a ready position, and the barrel retracts as the next shot is heated. Because the mold is kept cold, the plastic solidifies soon after the mold is filled. Once the part inside the mold cools completely, the mold opens, and the part is ejected. The next injection molding cycle starts the moment the mold closes and the polymer is injected into the mold cavity.

INJECTION MOLDING MATERIALS

Materials Selection: Many types of thermoplastic materials are available. Selection depends on the specific application. The chart below shows some of the most common materials being used.

Being the leading plastic mold maker in China, Forwa has been actively and sincerely striving to improve itself. And we have been doing a good job in mold making and plastic parts manufacturing and have much to its credit.

Assembling of manufacturing, design, engineering and marketing, our company has engaged ourselves in the field of mold making and plastic part molding and won the title of the ISO9001:2000 certificated corporation which has introduced the 5S system into the management. In order to fulfill the requirements of different clients correctly and effectively, we built up a special team called cost and technology team to do the DFM (design for manufacture) to customers for each project.

Now, our products, including various components of automobile, electron, computer peripheral, house application, industrial application and medical application, have been sold all over the world and win the favorable comment from the customers.

Being the professional in this line with adequate fund, we have various advanced facilities in house most of them are imported from Japan, Germany, and the USA. In order to keep all of our staffs to be stable and well-educated, we devote a lot into the education and training, especially for the engineers and technicians. Therefore, all of them are always proficient in operating the updated machines introduced by the company.

Our honorific customer

Forwa has gone from strength to strength by improving good quality and excellent service as well as client' reliability.

Forwa pays much more attention to technician training and corporate culture development.
Forwa will be your best partner and always with you to create briliant tomorrow.