Plastic mold you must grasp these a few!
Plastic mold you must grasp these a few!
Plastic mold, a kind of used for pressure molding, extrusion molding, injection, blow molding and low foaming of the combined plastic mold.
classification
A. Injection molding mold -- TV shell, keyboard button, plastic products surrounding electronic products, computer, toys, household articles (the most common application)
B. Blowing mold -- beverage bottle
C. Compression molding mold -- bakelite switch, scientific porcelain dishes
D. Transfer mold - integrated circuit products
E. Extrusion mold -- glue tube, plastic bag
F. Thermal molding mold -- transparent molding packaging shell
G. Rotating mold -- soft glue doll toy
Plastic mold you must grasp these a few!
Plastic moulds
The design of plastic mold should pay attention to the following problems:
1. The glue inlet should be set on the thick part of the product to ensure smooth and complete filling;
2, try to open in the product appearance and function does not affect the place, can be at the edge or the bottom;
3. At the end of the cold material hole near the sprue, the pulling rod is often set to facilitate the sprue demoulding;
4, large or flat products, it is recommended to use multi-point pouring, can prevent product warpage deformation and lack of material;
5, its position should be selected in the shortest plastic mold filling process, in order to reduce the pressure loss, is conducive to mold exhaust;
6. Avoid opening a gate near the thin and long core, so as to avoid direct impact of the material flow on the core, resulting in deformation dislocation or bending;
7. The gate size is determined by the product size, geometric shape, structure and plastic type. Small size can be taken first and then modified according to the mold test condition.
8, through the mold flow analysis or experience, to determine whether the product due to the location of the gate combined with the line, affect the appearance and function of the product, can be added cold material hole to solve;
9. When a mold is multi-hole, the same product adopts symmetrical feeding method. When different products are formed in the same mold, the largest product is placed near the main channel first.
Pay attention to the point
First, do not only focus on product design, ignore the plastic mold manufacturing.
Some users in the development of products or new product trial production, often only focus on the initial product development and development, ignoring the communication with the plastic mold production unit. After the product design scheme is initially determined, there are two advantages to contacting the mold manufacturer in advance:
1, can ensure that the design of the product has a good forming process, not because of parts difficult to process and modify the design.
2, mold production can do the design preparation in advance, to prevent poor consideration in a hurry, affect the construction period.
3, the production of high quality plastic mold, only the supply and demand of the two sides closely cooperate, in order to eventually reduce the cost, shorten the cycle.
Second, do not only look at the price, from the quality, cycle, all-round consideration of service.
1. There are many kinds of molds, which can be roughly divided into ten categories. According to the parts material, physical and chemical properties, mechanical strength, dimensional accuracy, surface finish, service life, economy and other different requirements, choose different types of mold forming.
2, high precision requirements of the mold needs to use high-precision CNC machine tool processing, and the mold material, forming process have strict requirements, but also need to use CAD/CAE/CAM mold technology to design and analysis.
3, some parts due to the special requirements of molding, mold also need to use hot runner, gas auxiliary molding, nitrogen cylinder and other advanced technology.
4, manufacturers should have CNC, EDM, wire cutting machine tools and CNC copying milling equipment, high-precision grinder, high-precision three-coordinate measuring instrument, computer design and related software, etc.
5, general large stamping die (such as automobile cover die) to consider whether the machine tool has a blank holding mechanism, or even edge lubricant, multi-station progressive, etc. In addition to stamping tonnage, also consider the punching, feeding device, machine tools and die protection device.
6, the mold manufacturing means and process is not every enterprise have and master. In the choice of cooperative manufacturers must understand its processing capacity, not only to see the hardware equipment, but also combined with management level, processing experience and technical strength.
7, for the same set of molds, different manufacturers sometimes have a big gap in the price. You should not pay more than the value of the mold, nor less than the cost of the mold. Mold manufacturers, like you, want to make a reasonable profit in their business. To order a set of molds at a much lower price would be the start of trouble. Users must set out from their own requirements, comprehensive measurement.
Three, avoid multi-head collaboration, as far as possible plastic mold production and product processing.
1. With qualified molds (specimens qualified), it is not necessarily possible to produce batch qualified products. This is mainly related to the selection of machining machine tools, forming technology (forming temperature, forming time, etc.) and the technical quality of the operator.
2, with a good mold, but also a good forming processing, it is best to cooperate through a dragon, try to avoid multi-head collaboration. If the conditions are not met, it is necessary to choose one party to take full responsibility for the contract. It must be clearly written in the contract.
Injection Molding Information