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A reverse extrusion production process of za27 zinc-based alloy shaft sleeve

A production process and reverse extrusion technology, which is applied in the field of reverse extrusion production of ZA27 zinc-based alloy bushings, can solve the problem of small zinc-based alloy bushings that are not easy to cast, difficult to manufacture water-cooled cores, and difficult to take out the bushings. and other problems, to achieve the effects of uniform ingot composition, improved mechanical properties, and improved wear reduction and wear resistance.

Active Publication Date: 2020-12-01
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the inner core water-cooled casting method can effectively improve the performance and yield of larger zinc-based alloy bushings, but for small zinc-based alloy bushings with an outer diameter between Φ60mm-Φ100mm, the inner core The tooling mold used in the water-cooled casting method is difficult to manufacture the water-cooled core, the casting process is inconvenient to operate, the shaft sleeve is not easy to take out from the tooling mold after cooling, and it is difficult to effectively avoid component segregation and bottom shrinkage defects in the casting. Using the existing technology It is not easy to cast a small zinc-based alloy bushing with excellent performance

Method used

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  • A reverse extrusion production process of za27 zinc-based alloy shaft sleeve

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Effect test

Embodiment 1

[0016] The reverse extrusion production process of a kind of ZA27 zinc-based alloy axle sleeve of embodiment 1 comprises the following steps:

[0017] 1) Assemble the corresponding reverse extrusion die to the extrusion machine to ensure that the centers of the punch, die and ejector rod are on the same straight line;

[0018] 2) Heat the mold to 180°C through a resistance preheater installed on the mold to obtain a preheated mold;

[0019] 3) Firstly, the ZA27 zinc-based alloy ingot was heated to 240°C and kept for 1.5 hours, and then the zinc-based alloy ingot was heated to 280°C and kept for 1 hour to obtain a zinc-based alloy ingot.

[0020] 4), first put the homogenized zinc-based alloy ingot prepared in step 3) into the preheated mold in step 2) for back extrusion, the extrusion speed of back extrusion is 5mm / s, and the back extrusion During the process, the temperature of the mold is kept at 180°C by a water cooling device; then the mold is opened and ejected by the ej...

Embodiment 2

[0021] The reverse extrusion production process of a kind of ZA27 zinc-based alloy axle sleeve of embodiment 2 comprises the following steps:

[0022] 1) Assemble the corresponding reverse extrusion die to the extrusion machine to ensure that the centers of the punch, die and ejector rod are on the same straight line;

[0023] 2) Heat the mold to 210°C through a resistance preheater installed on the mold to obtain a preheated mold;

[0024] 3) First, the ZA27 zinc-based alloy ingot was heated to 250° C. and held for 1.8 hours, and then the zinc-based alloy ingot was heated to 300° C. and held for 1 hour to obtain a zinc-based alloy ingot.

[0025] 4), first put the homogenized zinc-based alloy ingot prepared in step 3) into the preheated mold in step 2) for back extrusion, the extrusion speed of back extrusion is 8mm / s, and the back extrusion During the process, the temperature of the mold is kept at 200°C by a water cooling device; then the mold is opened and ejected by the ...

Embodiment 3

[0026] The reverse extrusion production process of a kind of ZA27 zinc-based alloy axle sleeve of embodiment 3 comprises the following steps:

[0027] 1) Assemble the corresponding reverse extrusion die to the extrusion machine to ensure that the centers of the punch, die and ejector rod are on the same straight line;

[0028] 2) Heat the mold to 240°C through a resistance preheater installed on the mold to obtain a preheated mold;

[0029] 3) First, the ZA27 zinc-based alloy ingot was heated to 260° C. and kept for 2 hours, and then the zinc-based alloy ingot was heated to 320° C. and kept for 1 hour to obtain a zinc-based alloy ingot.

[0030] 4), first put the homogenized zinc-based alloy ingot prepared in step 3) into the preheated mold in step 2) for back extrusion, the extrusion speed of back extrusion is 10mm / s, and the back extrusion During the process, the temperature of the mold is kept at 240°C by a water cooling device; then the mold is opened and ejected by the e...

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Abstract

The invention relates to the technical field of preparation of zinc-based alloy pipe sleeve products, and specifically discloses an extrusion production technology of a zinc-based alloy shaft sleeve.The extrusion production technology comprises the following steps: (1) assembling a backward extrusion die on an extrusion machine, and enabling centers of a male die, a female die and an ejector rodto be located on the same straight line; (2) heating a die to 180 to 240 DEG C, thus obtaining a preheated die; (3) carrying out homogenization treatment on a zinc-based alloy ingot for 2.5 to 3 hours, thus obtaining a homogenized zinc-based alloy ingot; (4) putting the homogenized zinc-based alloy ingot prepared in step (3) in the preheated die obtained in step (2) for carrying out backward extrusion, then opening the die, and ejecting through the ejector rod, thus obtaining the zinc-based alloy shaft sleeve. According to the extrusion production technology disclosed by the invention, the problems that when a casting method which is generally adopted at present is adopted for producing a small-size zinc-based alloy shaft sleeve, shrinkage cavity, dispersed shrinkage and composition segregation are caused at the bottom part of a casting can be solved, and meanwhile, the mechanical property and the wear-reduction and wear-resistant properties of the small-size zinc-based alloy shaft sleeve are increased.

Description

technical field [0001] The invention relates to the technical field of preparation of zinc-based alloy pipe sleeve products, in particular to a reverse extrusion production process of a ZA27 zinc-based alloy sleeve. Background technique [0002] ZA27 zinc-based alloy has successfully replaced copper alloy and Babbitt alloy for its good mechanical properties and anti-friction and wear-resisting properties, and is widely used in the production of various wear-resisting and wear-resisting products such as bushings, bearing bushes, sliders, and skateboards. At present, the vast majority of related production enterprises use conventional casting methods to manufacture zinc-based alloy shaft sleeves. There are phenomena such as composition segregation and shrinkage at the bottom of the sleeve, which greatly affect the yield and performance of the zinc-based alloy sleeve. [0003] In order to improve the mechanical properties and wear-reducing and wear-resistant properties of zinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/20C22F1/16
CPCB21C23/20C22F1/165
Inventor 王爱琴王震张琦飞刘哲朱爱民杨斌谢敬佩杨森马窦琴王文焱
Owner HENAN UNIV OF SCI & TECH
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