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Piercing needle semi-movable semi-fixed extrusion method

An extrusion method and piercing needle technology, which is applied in the semi-following and semi-fixed extrusion field of piercing needles, can solve the problems of lengthening the length of the ingot

Inactive Publication Date: 2017-09-15
HARBIN ZHONGFEI NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the deficiencies of the above-mentioned prior art, and provides a semi-following and semi-fixed perforating needle extrusion method; A semi-following and semi-fixed compound extrusion method of the extrusion needle, which can not only ensure that the perforation needle is not damaged, but also lengthen the length of the ingot, and can also reduce the problem of uneven inner diameter of the pipe when extruding with a follower needle.

Method used

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  • Piercing needle semi-movable semi-fixed extrusion method

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Effect test

Embodiment 1

[0018] combine figure 1 As shown, a perforating needle semi-following semi-fixed extrusion method disclosed in this embodiment includes the following steps:

[0019] a. Selection of ingot: the length of the ingot is greater than 650mm;

[0020] b. Follower pin extrusion: select the follower pin as the piercing pin, move the selected ingot forward for a certain distance while keeping the follower pin relatively stationary, and then the follower pin stops moving;

[0021] c. The follower needle stops: After the follower needle moves a certain distance with the ingot, it remains fixed relative to the mold;

[0022] d. Continue to extrude: Since the follower needle remains still, the inner diameter of the product at the extruded position will remain the same.

[0023] Specifically, the moving distance of the follower needle in step b is 100mm-200mm.

[0024] Specifically, the follow-up speed in step b above is 0.2 mm / s.

[0025] Specifically, the extrusion temperature in step ...

Embodiment 2

[0028] Use a 25mn horizontal reverse double-action extrusion machine to extrude 7059 alloy. The extrusion specification is 140*5mm pipe. According to the tensile stress of the extrusion needle and the maximum pressure that the equipment can withstand, a semi-following and semi-fixed extrusion is adopted. Pressing method, adjust the follow-up distance to 150mm long, the ingot size used is φ252*132*650mm, the extrusion temperature is 400°C, the extrusion speed is 0.2mm / s; the diameter of the follow-up pin is 129mm at the head end, 131mm.

Embodiment 3

[0030] Use a 25mn horizontal reverse double-action extrusion machine to extrude 7059 alloy. The extrusion specification is 140*5mm pipe. According to the tensile stress of the extrusion needle and the maximum pressure that the equipment can withstand, a semi-following and semi-fixed extrusion is adopted. Pressing method, the ingot specification used is φ252*132*650mm, the extrusion temperature is 400°C, and the extrusion speed is 0.2mm / s. The maximum extrusion force in the entire extrusion is 24.5mn, and in the subsequent inspection process, the inner diameter of the pipe is 129 to 129.2 at the head end, and the mm tail end is 129.6 to 129.8mm.

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Abstract

The invention relates to a semi-following and semi-fixed perforating needle extrusion method, which comprises the following steps: a. selection of an ingot: the length of the ingot is greater than 650mm; The piercing needle moves the selected ingot forward for a certain distance while keeping relatively still with the follower needle, and then the follower needle stops moving; c. The follower needle stops: after the follower needle moves a certain distance with the ingot , remain fixed relative to the mold; d, continue to extrude: since the follower pin remains stationary, the inner diameter of the product at the extrusion point is consistent after this; the present invention combines the follower pin extrusion mode and the fixed pin extrusion mode to form a This kind of extrusion needle semi-following semi-fixed compound extrusion method can not only ensure that the perforating needle is not damaged, but also lengthen the length of the ingot, and can also reduce the problem of uneven inner diameter of the pipe when extruding with a follower needle.

Description

Technical field: [0001] The invention relates to the technical field of ingot extrusion, in particular to a half-following and half-fixed extrusion method of perforating needles. Background technique: [0002] When extruding with a follower needle, there is no relative motion between the undeformed part of the extrusion ingot and the perforation needle, but shear stress appears in the deformed area, and the follower needle moves forward during extrusion, and then passes through the The mold, between the extruded product and the corresponding perforator, produces Coulomb friction much smaller than the shear friction, which is negligible relative to the tensile stress load of the perforator; when the follower needle is used, the perforator is It is designed as a shuttle structure with a tip diameter smaller than that of the tail end, resulting in the inner diameter of the extruded pipe head end being smaller than the inner diameter of the tail end; The diameter of the inner h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/20
CPCB21C23/205
Inventor 李彦超黄有才李金鑫范长龙王壮吕秀婷王琳李亚红张春波季春洁
Owner HARBIN ZHONGFEI NEW TECH CO LTD
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