Core pulling injection mold

What is core pull injection molding?

Elbow mold is called angel pin core pulling mold. Most of you probably have heard of the option “Core Pull” with Injection Molding Machines. Simply put, the core pull allows a cavity to be put in the product parallel to the clamp. The important component is that the product being create must need a place devoid of plastic that cannot be accommodated by the mold itself.

Molds, various molds, and tools used in industrial production to obtain required parts by injection molding blow molding, extrusion, Die-casting or forging molding, smelting, stamping, and other methods. In short, a mold is a tool used to make molded objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the article by changing the physical state of the formed material.

At present, the injection mold has become a very common mold used in the industrial production process. The slider is a mold component that can slide perpendicular to the mold opening direction or at a certain angle to the mold opening direction during the mold opening action. For some Parts with undercuts are often demoulded normally only by adopting a slider structure. But when the molded product is an arc-shaped hollow product, arc core-pulling molding is required

 

The core pulling system is used to handle the position where the product cannot be demolded on the parting surface. It is a special structure of the mold.

 

Core pulling is a definition: a mechanism that ensures the smooth demolding of the product, also called a slider.

 

For example, there is a hole on the side of a plastic part. After the mold is opened. If the core of the hole is not removed. The product cannot be ejected.

 

At this time, the structure of the mold must adopt the structure of the slider. The core of the hole is made movable, and the inclined guidepost is used to cooperate with the fixed mold. And the slider moves with the mold opening or closing. This kind of movement is called core pulling.

 

The core pulling mechanism is a common mechanism in the mold. The core pulling mechanism usually moves together with the upper mold and uses positioning or guiding mechanisms. Such as guide blocks to ensure the accuracy of the core pulling. In order to simplify the mold structure and reduce the mold space.

 

The common core pulling mechanism is mostly driven by a cylinder to complete the core pulling. There are various structures such as positive core pulling and reverse core pulling. The reverse core pulling structure takes up less space than the positive core-pulling structure. There are fewer restrictions on mold space.

 

However, the structure of the reverse core pulling is relatively complicated to set up. The process part is time-consuming, and the structure is complicated. The production and installation are time-consuming and labor-intensive, and too many parts affect the accuracy of the mold.

 

The positive core pulling adopts an oil cylinder to directly drive the pulling structure. This is simple in structure, but the oil cylinder requires a certain installation control and driving stroke. Which causes the increase of the mold and the cost of the mold. And the use of the mold increases the site requirements.