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Step mold used for cold header and capable of preventing ejector rod damage and application method of step mold

A cold heading machine and ejector technology, which can be used in manufacturing tools, forging/pressing/hammering machinery, forging/pressing/hammer devices, etc., can solve problems such as inability to perform heading, brittle fracture, and ejector plastic bending, etc. To achieve the effect of reducing the number of components, reducing the difficulty, and facilitating assembly

Inactive Publication Date: 2015-11-04
AEROSPACE PRECISION PROD INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the cold heading forming process, for the cold heading products of slender rods, especially the cold heading products with both slender rods and high hardness, because the aspect ratio of the step mold ejector rod exposed outside the step mold is very large, The strength of the forming head is very large, and the ejector pin will be subjected to a large bending moment transmitted by the product, which can easily lead to plastic bending or brittle fracture of the ejector pin, resulting in the failure of upsetting

Method used

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  • Step mold used for cold header and capable of preventing ejector rod damage and application method of step mold
  • Step mold used for cold header and capable of preventing ejector rod damage and application method of step mold
  • Step mold used for cold header and capable of preventing ejector rod damage and application method of step mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a step mold structure for cold heading machine for preventing ejector pin damage of the present invention includes four parts: ejector pin 1 , spacer 2 , step mold 3 , and ejector pin seat 4 . Wherein, the die hole of step die is made into front and back two parts, and the aperture size of die hole front portion 3-1 is equal to the usual lower die aperture size, and the aperture size of die hole rear portion 3-2 is smaller than die hole front portion 3 -1 aperture size, a right angle step 3-3 is made between the die hole front portion 3-1 and the die hole rear portion 3-2. The ejector rod 1 is made into front and rear parts, the front part 1-1 of the ejector rod is the head of a cylinder, and its diameter of the cylinder fits in clearance with the front part 3-1 of the die hole of the step mold; the rear part 1-2 of the ejector rod is a thin Long straight rod, the diameter of the straight rod is matched with the 3-2 gap at the rear part of th...

Embodiment 2

[0036] Such as image 3 As shown, a step mold structure for cold heading machine to prevent damage to the ejector pin of the present invention combines the ejector pin and the cushion block in Example 1, and includes three parts: the ejector pin 1, the step mold 3, and the ejector pin seat 4. Wherein, the die hole of step die is made into front and back two parts, and the aperture size of die hole front part 3-1 is equal to the usual step die aperture size, and the aperture size of die hole rear part 3-2 is smaller than die hole front part 3 -1 aperture size, a right angle step 3-3 is made between the die hole front portion 3-1 and the die hole rear portion 3-2. The ejector rod 1 is made into front and rear parts, the front part 1-1 of the ejector rod is the head of a cylinder, and its diameter of the cylinder fits in clearance with the front part 3-1 of the die hole of the step mold; the rear part 1-2 of the ejector rod is a thin Long straight rod, the diameter of the strai...

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PUM

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Abstract

The invention provides a step mold used for a cold header and capable of preventing ejector rod damage and an application method of the step mold. The mold comprises an ejector rod, a step mold body and an ejector rod seat, wherein the step mold body comprises an outer mold and a hard alloy inner mold with the same central axis; a right-angle step mold hole is formed in the inner mold; the inner diameter of the part, close to the ejector rod seat, of the mold hole is smaller than that of the part, far away from the ejector rod seat, of the mold hole; the part, close to the ejector rod seat, of the mold hole in the inner mold extends to the end surface of one end, close to the ejector rod seat, of the outer mold; the mold hole with the large aperture has the same aperture with the existing mold; one end of the ejector rod is a cylinder, and the cylinder is in clearance fit with the large-aperture part of the step mold body; the other part of the ejector rod is a long and thin rod, and the long and thin rod is in clearance fit with the small-aperture part of the step mold body; the long and thin rod penetrates through the mold hole of the step mold body and is in interference fit with the ejector rod seat; cushion blocks in clearance fit with the mold hole of the step mold body are arranged between the head of the cylinder of the ejector rod and the step of the step mold body. The ejector rod is not likely to be bent or broken, and finally, a heading process of a super-long and super-thin rod product with high hardness can be performed smoothly.

Description

technical field [0001] The invention belongs to the field of cold heading equipment, and in particular relates to a stepped die for cold heading machines which prevents damage to ejector pins. Background technique [0002] Cold heading machine is a common equipment with high production efficiency and less cutting or no cutting. Its internal mold structure is the key to ensure the quality of heading. The function of the ejector pin is to eject the product formed in the die. During the cold heading forming process, for the cold heading products of slender rods, especially the cold heading products with both slender rods and high hardness, because the aspect ratio of the step mold ejector rod exposed outside the step mold is very large, The strength of the forming head is very large, and the ejector pin will be subjected to a large bending moment transmitted by the product, which can easily lead to plastic bending or brittle fracture of the ejector pin, resulting in the failur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J13/02B21J13/14
Inventor 郭双双马玲郭云楼张晓斌贾晓娇
Owner AEROSPACE PRECISION PROD INC LTD