The injection cycle time is as short as possible under the premise

The injection cycle time is as short as possible under the premise of ensuring product quality. The shorter the injection cycle time, the more the production quantity, the lower the manufacturing cost per unit product. Injection cycle time includes: injection time, holding pressure time, cooling time (melting time), mold opening time, ejection time (including dwell time), door opening time, pickup time, door closing time, and mold clamping time (special The situation also includes the forward/backward time of the shooting stage and the time of spraying release agent).

The most important methods to shorten the injection cycle time are: reduce the wall thickness of the plastic part/runner size (to shorten the cooling time), reduce the opening and closing distance/thimble stroke, quickly take out the product, manipulator operation, and accelerate the speed of opening/closing the safety door , Reduce the phenomenon of plastic parts sticking to the mold, correctly choose the cooling time, reasonably set the opening/closing speed and the ejector speed/number of times.


"Scrap is the biggest waste." If there is a high defect rate, a large amount of scrap or a return phenomenon in the injection molding production process, the loss of raw materials, electricity, labor, and equipment (excluding other costs) will be very high. Big.

If mold maintenance is not done in place, mold failures will often occur during the production process, and frequent production stops will be required for maintenance. This will affect the smooth production and the stability of the quality of rubber parts, and will cause economic losses to the enterprise (such as mold repairs) Costs, plastic materials/power consumption, labor costs, loss of machine shutdown, etc.)

Megosztás a facebookon

Plastic mold processing is basically divided into static mold and movable mold. The one with sprue sleeve on the side of the injection head processed by the plastic injection mold is a static mold. The static mold generally consists of a sprue sleeve, a backing plate, and a template. A simple mold can also use a thicker template instead of a backing plate. Up. Plastic mold processing sprue sleeves are generally standard parts, and it is not recommended to cancel unless there are special reasons. The use of sprue sleeves for plastic mold processing is conducive to mold installation and easy replacement, without self-polishing. Plastic mold processing Some special mold sprue sleeves can be drilled out or cut by taper line cutting. When part of the mold must be demolded from the static mold, the static mold release mechanism must be added. The structure of the movable mold for plastic mold processing is generally a movable template, a movable mold backing plate, a demolding mechanism, and a mold foot and a fixed plate for the installation.

In addition to the stripping rod, there is also a return rod in the demolding mechanism. In the injection molding part of the plastic shell, a spring must be added to realize functions such as automatic demolding. The basic structure of the mold is also indispensable for plastic shell injection processing, as well as guide posts, cooling water holes, and runners. Of course, the inclined guide mold also has inclined guide boxes, inclined guide posts, etc. When designing a mold for a product, the plastic shell injection molding process must first set the basic structural dimensions of the mold to prepare materials to speed up the mold manufacturing. Plastic shell injection molding complex products should first draw the product picture, and then determine the size of the mold.

The gate is directly related to the beauty of the plastic part. If the gate design is not good, defects are likely to occur. It is easy to produce snake-like flow when the plastic shell is sprayed without any obstruction. Plastic shell spraying should also be designed for overflow and exhaust for products with high requirements. The ejector pin can be used at the overflow, and there should be no overflow flash on the template, so as not to affect the life of the mold. There are also more and more software for plastic shell spraying design molds, and most of them rarely use pencils to draw mold drawings.

Megosztás a facebookon

Plastic trash can molds have very high requirements. Generally, environmental protection PP materials are mostly used, which can produce a bright surface and then do film printing and other treatments. It becomes a high-end trash can, but it is not necessary to make a good trash can. Easy. First of all, the quality of the mold must be controlled, including mold design, mold assembly, hot runner and cold runner selection, etc. As the saying goes, laymen watch the excitement, and experts watch the doorway. Annoy mold tells you how to better control plastic Problems in the mold processing process?

Mold asseFactory Custom newly design Plastic Injection dustbin Mould (JTP-A0119)mbly is just like assembling a machine. Every component and every screw cannot be wrong, otherwise the consequences will be very serious, from the slightest to the product defect, affecting the production, and the other to completely damaging the mold and causing scrap. Therefore, the assembly work must be very meticulous. During the assembly process, pay attention to the cleaning of the mold, especially the waterway and screw holes. The iron filings must be blown out, otherwise the customer will be very angry and the consequences will be very serious.

Megosztás a facebookon