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Preparation method for powder metallurgy rotating hub gear

A powder metallurgy and gear technology, which is applied in the field of powder metallurgy hub gear preparation, can solve the problems of low elongation of powder metallurgy materials, inability to complete the welding process, reduced welding strength, etc., and achieves a simple preparation method and a firm structure of the hub gear. , the effect of reducing production costs

Inactive Publication Date: 2016-06-15
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After sintering, the two parts are welded, but for powder metallurgy parts, due to the presence of pores, the number, shape and distribution of pores will affect the physical properties of the material (such as thermal conductivity, thermal expansion rate, hardenability, etc.), these physical properties It directly affects the weldability of the material, and the shrinkage of the weld seam during the ordinary welding cooling process will produce a large tensile stress. Due to the low elongation of powder metallurgy materials, cracks are often prone to occur under the action of this tensile stress, resulting in a decrease in welding strength. , even unable to complete the soldering process
[0006] Therefore, adopt powder metallurgy technology to prepare the method for rotating hub gear in the prior art, all need to improve

Method used

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  • Preparation method for powder metallurgy rotating hub gear
  • Preparation method for powder metallurgy rotating hub gear
  • Preparation method for powder metallurgy rotating hub gear

Examples

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Effect test

Embodiment 1

[0036] The preparation method of the powder metallurgy hub gear in this embodiment is characterized in that it includes the following steps:

[0037] (1) Design material composition

[0038] In terms of mass percentage, the material used for the hub gear base includes the following components: 5% copper, 2% unavoidable impurity elements, and the balance is iron;

[0039] In terms of mass percentage, the material used for the hub gear shaft includes the following components: 5% copper, 2% or less unavoidable impurity elements, and the balance is iron;

[0040] (2) suppression

[0041] Such as Figure 2-4 As shown, the above-mentioned hub gear base material is pressed to a density of 6.5g / cm 3 The base body of the hub gear, the above-mentioned hub gear shaft material is pressed to a density of 6.5g / cm 3 The hub gear shaft; the center of the hub gear base 1 is formed with a circular through hole 10 for accommodating the hub gear shaft 2, and the end of the hub gear shaft 2 is...

Embodiment 2

[0045]The preparation method of the powder metallurgy hub gear in this embodiment is characterized in that it includes the following steps:

[0046] (1) Design material composition

[0047] In terms of mass percentage, the material used for the hub gear base includes the following components: 0.2% carbon, 3% copper, unavoidable impurity elements below 2%, and iron as the balance;

[0048] In terms of mass percentage, the material used for the hub gear shaft includes the following components: 5% copper, 2% or less unavoidable impurity elements, and the balance is iron;

[0049] (2) suppression

[0050] Such as Figure 2-4 As shown, the above-mentioned hub gear base material is pressed to a density of 7g / cm 3 The base body of the hub gear, the above-mentioned hub gear shaft material is pressed to a density of 6.5g / cm 3 The hub gear shaft; the center of the hub gear base 1 is formed with a circular through hole 10 for accommodating the hub gear shaft 2, and the end of the hub...

Embodiment 3

[0054] The preparation method of the powder metallurgy hub gear in this embodiment is characterized in that it includes the following steps:

[0055] (1) Design material composition

[0056] In terms of mass percentage, the material used for the hub gear base includes the following components: 0.2% carbon, unavoidable impurity elements below 2%, and iron as the balance;

[0057] In terms of mass percentage, the material used for the hub gear shaft includes the following components: 1.0% carbon, 2% or less unavoidable impurity elements, and the balance is iron;

[0058] (2) suppression

[0059] Such as Figure 5-7 As shown, the above-mentioned hub gear base material is pressed to a density of 7.2g / cm 3 The base body of the hub gear, the above-mentioned hub gear shaft material is pressed to a density of 7.5g / cm 3 The hub gear shaft; the center of the hub gear base body 1 is formed with an inner spline-shaped through hole 10 for accommodating the hub gear shaft 2, and the end...

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Abstract

The invention relates to a preparation method for a powder metallurgy rotating hub gear. The method comprises a process of designing material composition, a pressing process and a sintering welding process, wherein a brand-new welding method of connecting a rotating hub gear substrate with a rotating hub gear shaft together is employed in the sintering welding process; compared with a method for integrally forming the rotating hub gear in the prior art, the preparation method disclosed by the invention does not need to prepare a mold with a complicated structure, and does not need to specially equip high-end equipment, so that production cost is reduced; a sintering welding manner is adopted by the preparation method disclosed by the invention instead of a common welding manner in the prior art, and soldering flux is introduced into a connection gap through diversion trenches, and welded connection is reinforced from three parts, so that connection strength and positioning accuracy of the rotating hub gear substrate and the rotating hub gear shaft are increased, and the prepared rotating hub gear is firm in structure; and moreover, the preparation method disclosed by the invention is simple, and is convenient for performing mass production.

Description

technical field [0001] The invention relates to the technical field of preparation of powder metallurgy parts, in particular to a method for preparing a powder metallurgy hub gear. Background technique [0002] Rotary hub gears are widely used in gearboxes. Rotary hub gears are parts with multiple steps. The shape and structure are very complicated. They are generally manufactured by machining. The cost of machining is high, and the speed is slow and the production efficiency is low. , The consistency of the product is poor, so the current hub gear is generally produced by powder metallurgy process. [0003] The existing hub gear powder metallurgy manufacturing processes mainly include the following types: [0004] 1. The whole part is formed in a one-time forming method. Due to the complex structure of the part, there are many steps. According to the part structure, 3 upper punches and 5 lower punches are required, which requires an internationally advanced CNC press with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F5/08C22C38/16B22F7/06B23P15/14
CPCB22F3/16B22F5/08B22F7/062B23P15/14C22C38/16
Inventor 朱锋包崇玺王劲松徐锋朱承旭
Owner NBTM NEW MATERIALS GRP
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