Core-pulling needle quick-changing device

Abstract

The invention relates to a core-pulling needle quick-changing device which comprises a needle sleeve, an oil cylinder connecting rod, an oil cylinder, and a first guiding sleeve, a second guiding sleeve and a third guiding sleeve sequentially connected in an axial direction. The rear end of the needle sleeve is arranged in the first guiding sleeve; a core-pulling needle is arranged in the needle sleeve and the second guiding sleeve; the oil cylinder connecting rod is arranged in the third guiding sleeve; the core-pulling needle is connected to the front end of the oil cylinder connecting rod;an oil cylinder connecting sleeve is arranged at the rear end of the oil cylinder connecting rod and is connected with an oil cylinder output end; the oil cylinder can drive the oil cylinder connecting rod to slide in the third guiding sleeve; a fixing plate is connected to the rear end of the third guiding sleeve and is connected to the outer side of a mold base; and the oil cylinder connecting rod is connected with a stroke guiding device. According to the core-pulling needle quick-changing device provided by the invention, the aims of quickly changing the needle sleeve and the core-pullingneedle are achieved, and the needle sleeve and the second guiding sleeve play a role in guiding, so that the core-pulling needle is smooth to move without being easily stuck or broken.

Description

technical field [0001] The invention relates to a quick-change device for a core-pulling needle. Background technique [0002] The clutch housing is one of the basic parts of mechanical transmission in various automobiles, aircrafts and other equipment. The product needs to be inspected for air tightness. It is required that the product has good mechanical properties, compact structure, and casting defects are not allowed inside. In order to reduce the defect rate of product air shrinkage cavity, the place with relatively thick wall thickness on the product should be solved by making core-pulling pins or extruding. If oil leakage is not allowed at the position of the oil passage hole, then the oil passage hole of the product should be solved by core pulling to reduce the excessive processing allowance of the product and the exposure of pores. During the core-pulling movement, there is sliding friction with the mold core. When the product is mass-produced in the later stage,...

AI Technical Summary

Problems solved by technology

The needle sleeve is usually fixed on the mold core with screws. Once the needle sleeve is replaced, the entire mold must be disassembled to take out the needle sleeve, which increases the difficulty of the mold manufacturing process and affects the mold manufacturing cycle.

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