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Powder metallurgy compound cam and manufacturing method thereof

A composite cam and powder metallurgy technology, applied in the cam field, can solve the problems of uneven roundness of 2-2 inner lining, increase cost, etc., and achieve uniform hardness distribution, good inner hole dimensional accuracy, and good wear resistance.

Inactive Publication Date: 2015-06-17
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but figure 2 There is also a certain problem in the powder metallurgy composite cam described in , because the thickness of the cam 2-1 at the tip of the peach is greater than the thickness of the base circle, so when the cam shrinks, the difference between the tip of the peach and the base circle to the inner lining 2-2 The resulting stress is different, resulting in uneven roundness of the lining 2-2, which requires subsequent processing and increases the cost

Method used

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  • Powder metallurgy compound cam and manufacturing method thereof
  • Powder metallurgy compound cam and manufacturing method thereof
  • Powder metallurgy compound cam and manufacturing method thereof

Examples

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Embodiment 1

[0050] This embodiment provides a powder metallurgy composite cam, image 3 Its schematic top view is shown. Such as image 3 As shown, the powder metallurgy composite cam 3 includes a cam plate 3-1 and an inner lining 3-2. The shown cam piece 3-1 is combined with the inner liner 3-2.

[0051]In the application of the cam, the cam plate 3-1 of the cam needs to work together with the driving mechanism such as the tappet of the engine, which requires the outer edge of the cam plate 3-1 to have a higher hardness, so in this embodiment the cam plate 3 -1 is made of the first material by powder metallurgy. The first material is composed of a host material including iron, phosphorus, and carbon, and an additive material, and the additive material is any one or a combination of elements such as chromium, molybdenum, tungsten, copper, nickel, silicon, and manganese. The composition and mass percentage of the first material are 0-20% of chromium, 0-10% of molybdenum, 0-5% of tungst...

Embodiment 2

[0063] This embodiment provides another powder metallurgy composite cam, Figure 5 Its schematic top view is shown. Such as Figure 5 As shown, the powder metallurgy composite cam 4 includes a cam piece 4-1 and an inner lining 4-2. The shown cam piece 4-1 is combined with the inner lining 4-2.

[0064] In the application of the cam, the cam plate 4-1 of the cam needs to work together with the driving mechanism such as the tappet of the engine, which requires the outer edge of the cam plate 4-1 to have a higher hardness, so in this embodiment, the cam plate 4-1 -1 is made of the first material. The first material is composed of a host material including iron, phosphorus, and carbon, and an additive material, and the additive material is any one or a combination of elements such as chromium, molybdenum, tungsten, copper, nickel, silicon, and manganese. The composition and mass percentage of the first material are 0-20% of chromium, 0-10% of molybdenum, 0-5% of tungsten, 0-15...

Embodiment 3

[0073] This embodiment provides the preparation method of the powder metallurgy composite cam in the first embodiment and the second embodiment.

[0074] The preparation method includes the following steps.

[0075] Firstly, the cam piece green body and the lining green body are manufactured respectively, the raw material of the cam piece green body is a first material, and the first material is composed of a main body material including iron, phosphorus and carbon and an added material, and the added The material is any one or combination of chromium, molybdenum, tungsten, copper, nickel, silicon, manganese and other elements. The composition and mass percentage of the first material are 0-20% of chromium, 0-10% of molybdenum, 0-5% of tungsten, 0-15% of copper, 0-8% of nickel, and 0% of silicon. ~3%, manganese is 0~3%, phosphorus is 0.1~1%, carbon is 0.1~5%, and the rest is iron. In a preferred manner, the composition and mass percentage of the first material are 3-6% of chro...

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Abstract

The invention belongs to the technical field of cams, and in particular, relates to a powder metallurgy compound cam and a manufacturing method thereof. The powder metallurgy compound cam consists of a cam piece and a liner with different materials, wherein the cam piece and the liner both comprise outer edges and inner edges, and further comprise base circle parts and peach tip parts; the inner edge of the cam piece and the outer edge of the liner are compounded through metallurgical bonding; and the outer edge of the liner and the inner edge of the cam piece are the same in shape, are both similar to the outer edge of the cam piece in shape, and are both cam-shaped. Blanks of the cam piece and the liner are sintered to obtain the powder metallurgy compound cam. The compound cam is suitable for a mechanically assembled cam shaft; and compared with a conventional powder metallurgy cam or a steel cam, the compound cam can save such procedures as keyway pulling and induction hardening, and has such advantages as high density, good precision of inner hole size, high torque, even hardness distribution of the liner and the cam piece, stress relief and good wear resistance.

Description

technical field [0001] The invention belongs to the technical field of cams, in particular to a powder metallurgy composite cam and a manufacturing method thereof. Background technique [0002] Assembled camshafts have the advantages of light weight, flexible design and processing, and good wear resistance, and are currently widely used in automobile and motorcycle engines. Traditional cam pieces are generally prepared by forging, extrusion, drawing and other processes, and then subjected to surface quenching treatment. The steel sheet is directly hot-forged into a blank by using a forging process, and then cold-forged to prepare a cam sheet steel pipe blank with high dimensional accuracy. The cam piece can also be directly prepared by cold forging. It is also possible to directly prepare the cam piece by extrusion process, then carry out cold drawing to control the size, and then cut to obtain the cam piece with high dimensional accuracy. People have also developed and a...

Claims

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Application Information

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IPC IPC(8): B22F5/08F16H53/00B22F7/06
Inventor 王林山梁雪冰汪礼敏王磊
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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