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Manufacturing method of cam of engine camshaft

A manufacturing method and camshaft technology, which are applied in the direction of manufacturing tools, furnace types, furnaces, etc., to achieve the effects of reducing production costs, improving production efficiency, and high precision

Inactive Publication Date: 2011-04-06
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a high-precision, high-strength, simple-process, and low-cost manufacturing method of an engine camshaft cam in view of the above-mentioned technical status, so as to solve the problem of precision forging cam dimensional accuracy, production efficiency, die life and cost. question

Method used

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  • Manufacturing method of cam of engine camshaft
  • Manufacturing method of cam of engine camshaft
  • Manufacturing method of cam of engine camshaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] ① Prepare the raw material, that is, the mixed powder of iron alloy and carbon. The ratio is: iron alloy (1.5% chromium, 0.2% molybdenum, 98.3% iron) is 99.45%, carbon is 0.25%, and then added content is 0.3% Organosilane wax lubricants;

[0036] ② Press the above mixed powder on a press with a pressure greater than 600Mpa to make the density greater than 7.45g / cm 3 Cam parts; pressing can adopt warm pressing forming, mold heating forming;

[0037] ③ Sintering, the cam part is sintered at a temperature of 1250° C., and the sintering time is 20 minutes. The sintering is carried out in a vacuum sintering furnace or in a sintering furnace based on nitrogen and the proportion of hydrogen is 10vol%;

[0038] ④Heat treatment: Determine the heat treatment process according to the chemical composition requirements of the sintered parts. The carbon potential of heat treatment is 0.8%, the quenching temperature is 840°C, and the heat preservation is 30 minutes. The tempering tem...

Embodiment 2

[0042] ① Prepare the raw material, that is, the mixed powder of iron alloy and carbon. The ratio is: iron alloy (1.5% chromium, 0.2% molybdenum, 98.3% iron) is 99.1%, carbon is 0.60%, and then added content is 0.3% Organosilane wax lubricants;

[0043] ② Press the above mixed powder on a press with a pressure greater than 600Mpa to make the density greater than 7.40g / cm 3 The cam parts; pressing can adopt warm pressing forming, mold heating forming.

[0044] ③Sintering, the cam part is sintered at a temperature of 1250°C, the sintering time is 30 minutes, and the sintering is carried out in a vacuum sintering furnace or in a sintering furnace based on nitrogen and the proportion of hydrogen is 10vol%;

[0045] ④Heat treatment, using high-frequency heat treatment, the depth of the heat treatment hardened layer is 2.5mm at the tip of the cam and the transition part, and 1.8mm at other parts, the hardness HV1 is greater than 520, the tempering temperature is 200 ° C, and the hea...

Embodiment 3

[0048]① Prepare the raw materials, that is, the mixed powder of iron, chromium, carbon and nickel. The ratio is: iron alloy (1.5% chromium, 0.2% molybdenum, 98.3% iron) is 97.95%, carbon is 0.25%, nickel is 1.5%, and then add 0.3% organosilane wax lubricant;

[0049] ② Press the above mixed powder on a press with a pressure greater than 600Mpa to make the density greater than 7.4g / cm 3 The cam parts; pressing can adopt warm pressing forming, mold heating forming.

[0050] ③Sintering, the cam part is sintered at a temperature of 1300°C, the sintering time is 30 minutes, and the sintering is carried out in a vacuum sintering furnace or in a sintering furnace based on nitrogen and the proportion of hydrogen is 75vol%;

[0051] ④Heat treatment: Determine the heat treatment process according to the chemical composition requirements of the sintered parts. The heat treatment quenching temperature is 900°C, the heat treatment carbon potential is 0.8%, the heat preservation is 35 minu...

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Abstract

The invention relates to a manufacturing method of a cam of an engine camshaft, which is characterized by successively comprising the following steps of: (1) preparing raw materials, namely a mixed powder of iron, chromium, molybdenum, nickel, carbon and copper, and adding a lubricant with 0.1-1% mass ratio; (2) pressing the mixed powder on a pressing machine under the pressure greater than 600 MPa into a cam part with density greater than 7.3 g / cm<3>; (3) sintering the cam part at the temperature of 1100-1350 DEG C for more than 10-30 min in a vacuum sintering furnace or a continuous sintering furnace; and (4) thermally treating, determining the thermal treatment process according to the chemical composition requirements of the sintered part, quenching at the temperature of 800-1000 DEG C, maintaining the temperature for 30-45 min, or adopting high-frequency thermal treatment, tempering at the temperature of 150-400 DEG C, and maintaining the temperature for 110-130 min. The manufacturing method has the advantages of simple process, high product precision, great strength, good surface smoothness, lowered production cost and enhanced production efficiency.

Description

technical field [0001] The invention relates to a method for manufacturing an engine camshaft cam. Background technique [0002] As an important part of the engine, the cam is responsible for the timing opening and closing of the intake and exhaust valves of each cylinder of the engine. The camshaft realizes the switch of the valve by the intake and exhaust valves of the cylinder jacked by the cam. [0003] The sides of the cam are egg-shaped. The purpose of its design is to ensure sufficient intake and exhaust of the cylinder, specifically to complete the opening and closing of the valve in the shortest possible time. In addition, considering the durability of the engine and the smoothness of operation, the valve cannot produce too much impact due to the acceleration and deceleration process in the switching action, otherwise it will cause serious wear of the valve, increased noise or other serious consequences. Therefore, there is a direct relationship between the cam a...

Claims

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Application Information

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IPC IPC(8): B22F5/08B22F3/16B22F3/24C21D1/18C21D9/32C22C38/44C22C38/42C22C38/40C22C38/22C22C38/20C22C38/18C22C38/16C22C38/12C22C38/08
Inventor 曹红斌包崇玺朱承旭
Owner NBTM NEW MATERIALS GRP
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