Powdery metallurgy balance block for crankshaft of gasoline engine and production method for powdery metallurgy balance block

A powder metallurgy and gasoline engine technology is applied to the powder metallurgy balance weight of the gasoline engine crankshaft and its production field.

Inactive Publication Date: 2012-12-05
吕元之
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of the gasoline engine crankshaft balance weight and its production method are: due to the extremely high machining accuracy of the gasoline engine crankshaft balance weight, it is difficult to ensure the q

Method used

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  • Powdery metallurgy balance block for crankshaft of gasoline engine and production method for powdery metallurgy balance block
  • Powdery metallurgy balance block for crankshaft of gasoline engine and production method for powdery metallurgy balance block
  • Powdery metallurgy balance block for crankshaft of gasoline engine and production method for powdery metallurgy balance block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Implemented in our company, raw materials are weighed in batches of 100 pieces. produce as figure 1 , figure 2 , image 3 The shown gasoline engine crankshaft powder metallurgy balance weight.

[0029] The gasoline engine crankshaft powder metallurgy balance weight is characterized in that it includes a powder metallurgy semicircle block 1 and a powder metallurgy crank 2, and a fixing hole 3 at one end of the main shaft is provided at the connection part of the powder metallurgy semicircle block 1 and the powder metallurgy crank 2, and the powder The end of the metallurgical crank 2 is provided with a fixing hole 4 of the crank shaft, and the powder metallurgy semicircle fast 1 and the powder metallurgy crank 2 are symmetrical with respect to the fixing hole 3 at one end of the main shaft for weight balance; the fixing hole at one end of the main shaft One side of the inner wall of the 3 is a flat wall 8, and one end of the main shaft is inserted into the fixing hol...

Embodiment 2

[0045] The raw materials are weighed in batches of 100 pieces, including: copper powder 1%, nickel powder 3%, molybdenum powder 0.3%, graphite 0.7%, paraffin wax 0.6%, and the balance is iron powder.

[0046] Production steps (1), (2), (3) are the same as in Example 1.

[0047] In the production step (4), sinter the powder metallurgy balance block blank of the gasoline engine crankshaft: use a mesh belt furnace for sintering, the temperature in the pre-sintering stage is 780°C, last for 60 minutes, and the temperature in the alloying and sintering stage is 1120°C, last for 85 Minutes, cool down with the furnace.

[0048] In step (5), the qualified finished product is tested: After standard testing, its technical indicators are as follows: 100 pieces are all tested, and the test results are: 98 pieces have technical indicators as follows:

[0049] Average density: >7.52g / cm 3 ;

[0050] Average heat treatment hardness: HRC52;

[0051] Average tensile strength: >1050MPa;

[0...

Embodiment 3

[0055] The raw materials are weighed in batches of 100 pieces, including: copper powder 5%, nickel powder 1.5%, molybdenum powder 0.6%, graphite 0.8%, paraffin wax 1%, and the balance is iron powder.

[0056] Production steps (1), (2), (3) are the same as in Example 1.

[0057] In the production step (4), sinter the powder metallurgy balance block blank of the gasoline engine crankshaft: use a mesh belt furnace for sintering, the temperature in the pre-sintering stage is 850°C for 60 minutes, and the temperature in the alloying and sintering stage is 1120°C for 65 Minutes, cool down with the furnace.

[0058] In step (5), the qualified finished product is tested: After standard testing, its technical indicators are as follows: 100 pieces are all tested, and the test result is: 96 pieces reach:

[0059] Average density: >7.5g / cm 3 ;

[0060] Average heat treatment hardness: HRC56;

[0061] Average tensile strength: >1060MPa;

[0062] Dimensional accuracy grade: ≥IT 7 grade...

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Abstract

The invention discloses a powdery metallurgy balance block for a crankshaft of a gasoline engine and a production method for the powdery metallurgy balance block. The powdery metallurgy balance block is characterized by comprising a powdery metallurgy semi-circular block and a powdery metallurgy crank, wherein a fixing hole at one end of a main shaft is formed at the connection position between the powdery metallurgy semi-circular block and the powdery metallurgy crank; a fixing hole of the crankshaft is formed on the end part of the powdery metallurgy crank; and a flat wall is formed on one side of an inner wall of the fixing hole at one end of the main shaft, and is pressed and sintered into a whole through powdery metallurgy. According to the powdery metallurgy balance block for the crankshaft of the gasoline engine and the production method for the powdery metallurgy balance block, the main shaft is fixed in an interference mode by inserting into the fixing hole which is additionally formed at one end of the main shaft, and powdery metallurgy mixed powder is pressed and sintered into a whole, so that equipment is simplified, production cost is reduced, and marketing promotion is facilitated.

Description

technical field [0001] The invention relates to an improvement of a gasoline engine crankshaft balance weight and a production method thereof, in particular to a gasoline engine crankshaft powder metallurgy balance weight and a production method thereof. Background technique [0002] The gasoline engine crankshaft balance block is an accessory that makes the gasoline engine crankshaft rotate smoothly. It requires extremely high dimensional accuracy with a tolerance of 0.02mm. The gasoline engine crankshaft balance weight currently used includes a semicircular block and a crank. A main shaft perpendicular to the semicircular block is provided on one side of the connection between the semicircular block and the crank, and a fixing hole for the crank shaft is provided at the end of the crank. The thickness of the crankshaft is greater than that of the crank to balance the weight. They are all made of alloy steel by casting or turning. The shortcomings of the gasoline engine cr...

Claims

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Application Information

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IPC IPC(8): F16F15/28B22F3/16B22F5/00
Inventor 吕元之
Owner 吕元之
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