Core pulling mechanism for injection mold

Abstract

A core pulling mechanism for an injection mold comprises a fixed die, a small sliding block and a big sliding block. A through hole is formed in the position, below the small sliding block, of the big sliding block. A limiting block is connected into the through hole in a sliding manner. A first limiting hole capable of being in limiting fit with the upper end of the limiting block is arranged in the lower portion of the small sliding block. A second limiting hole capable of being limiting fit with the lower end of the limiting block is formed in the upper end face of the fixed die. The length of the through hole plus the depth of the second limiting hole equals the length of the limiting block. The interval between the first limiting hole and the second limiting hole equals the sliding distance of the small sliding block relative to the big sliding block. A forcing limiting block for the small sliding block is arranged on the big sliding block. The interval between the forcing limiting block and the small sliding block equals the interval between the first limiting hole and the second limiting hole. The lower end of the limiting block is provided with a trapezoid or arc first protrusion. The second limiting hole is the same as the first protrusion in shape. Compared with the prior art, the core pulling mechanism has the beneficial effects of being small in size, simple in structure, good in use stability and long in service life.

Description

technical field [0001] The invention relates to a core pulling mechanism of an injection mold. Background technique [0002] At present, due to the complex product structure, there is an injection mold that requires a small slider to slide for a certain distance, and then the small slider and the large slider are pulled out together; in order to realize the delay action during core pulling in the prior art, most of them use The most popular is the combination of oblique rods and waist holes, but this structure makes the opening distance between the upper and lower molds large enough, otherwise the second core-pulling action cannot be realized, which leads to a larger overall mold and requires more space for the mold to be used. It is large enough to limit the scope of use of the mold, and it also makes the entire production cycle longer and the production efficiency lower; some of them use marbles to lock between the large and small sliders, but due to the existence of sprin...

AI Technical Summary

Problems solved by technology

[0002] At present, due to the complex product structure, there is an injection mold that requires a small slider to slide for a certain distance, and then the small slider and the large slider are pulled out together; in order to realize the delay action during core pulling in the prior art, most of them use The most popular is the combination of oblique rods and waist holes, but this structure makes the opening distance between the upper and lower molds large enough, otherwise the second core-pulling action cannot be realized, which leads to a larger overall mold and requires more space for the mold to be used. It is large enough to limit the scope of use of the mold, and it also makes the entire production cycle longer and the production efficiency lower; some of them use marbles to lock between the large and small sliders, but due to the existence of springs, during use Bite marks and scratches are prone to appear between the middle pin and the lock hole and on the lower end surface of the small slider, which will increase the friction force of the large and small sliders during the sliding process, which will easily lead to heat concentration, thereby deteriorating the sliding accuracy of the large and small sliders. The use stability is poor, and the service life is also shortened

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