Casting process for clutch pressure disc

A casting process and clutch technology, which is applied in the casting process field of clutch pressure plate, can solve the problems of unstable casting quality, reduced cutting amount, and large splitting effect, so as to increase pearlite content, improve work efficiency, and increase eutectic clusters number effect

Inactive Publication Date: 2017-12-01
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The clutch pressure plate is an important structure on the clutch, which plays an important role in the driving safety of the car. In the prior art, castings are usually obtained by casting. The shape and size are very close to the parts, reducing the amount of cutting. It is a non-cutting process, but at the same time The problem of unstable casting quality. In order to ensure the performance requirements of the automotive pressure plate, there are relatively strict requirements on the chemical composition, metallographic structure, graphite morphology, tensile strength, hardness, etc. of the automotive pressure plate castings. In actual production, due to the The strength, plasticity and toughness of flake graphite in the middle are almost zero, which destroys the continuity of the matrix, reduces the effective area of ​​the matrix, and forms stress concentration at the tip of the graphite flake, causing the material to form a brittle fracture. The number of graphite flakes The larger the size, the coarser the size, the more uneven the distribution, and the lower the tensile strength and plasticity of cast iron. Among them, C-type graphite has the greatest splitting effect on the matrix, and secondly, D+E-type graphite has a greater splitting effect on the matrix. Therefore, How to reduce the content of C, D, and E graphite has become a technical problem that needs to be studied in the casting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A casting process for a clutch pressure plate, comprising the following steps:

[0019] (1) In parts by weight, put 14 parts of scrap steel and 3 parts of ferromanganese into an intermediate frequency electric furnace to melt into molten steel, and when the temperature in the intermediate frequency electric furnace rises to 1150°C, add 44 parts of pig iron, 32 parts of Return to furnace charge, then slagging, add 1.8 parts of silicon carbide, 2.9 parts of molybdenum, and 0.6 parts of tin after slagging, and melt to form molten iron;

[0020] Wherein, the sulfur content in the molten iron after iron removal is 0.037wt%, the copper content is 0.04wt%, the manganese content is 0.65wt%, the molybdenum content is 0.26wt%, the silicon content is 2.7wt%, The carbon content is 4.5wt%, the tin content is 0.052wt%, the barium content is 0.012wt%, and the balance is unavoidable impurities and iron;

[0021] (2) At this time, take samples from the molten iron in the intermediate f...

Embodiment 2

[0028] A casting process for a clutch pressure plate, comprising the following steps:

[0029] (1) In parts by weight, put 12 parts of scrap steel and 3 parts of ferromanganese into an intermediate frequency electric furnace to melt into molten steel, and when the temperature in the intermediate frequency electric furnace rises to 1200°C, add 46 parts of pig iron, 30 parts of scrap steel and 15 parts of Return to furnace charge, then slagging, add 1.4 parts of silicon carbide, 3.4 parts of molybdenum, and 0.7 parts of tin after slagging, and melt to form molten iron;

[0030] Wherein, the sulfur content in the molten iron after iron removal is 0.025wt%, the copper content is 0.02wt%, the manganese content is 0.72wt%, the molybdenum content is 0.34wt%, the silicon content is 2.8wt%, The carbon content is 4.75wt%, the tin content is 0.72wt%, the barium content is 0.008wt%, and the balance is unavoidable impurities and iron;

[0031] (2) At this time, sample and analyze the molt...

Embodiment 3

[0038] A casting process for a clutch pressure plate, comprising the following steps:

[0039] (1) In parts by weight, put 16 parts of scrap steel and 2 parts of ferromanganese into an intermediate frequency electric furnace to melt into molten steel, and when the temperature in the intermediate frequency electric furnace rises to 1100°C, add 42 parts of pig iron, 34 parts of Return to the furnace charge, and then remove slagging, add 2.2 parts of silicon carbide, 2.5 parts of molybdenum, and 0.4 parts of tin after slagging, and smelt to form molten iron;

[0040] Wherein, the sulfur content in the molten iron after iron removal is 0.05wt%, the copper content is 0.05wt%, the manganese content is 0.58wt%, the molybdenum content is 0.17wt%, the silicon content is 2.6wt%, The carbon content is 4.25wt%, the tin content is 0.035wt%, the barium content is 0.016wt%, and the balance is unavoidable impurities and iron;

[0041] (2) At this time, take samples from the molten iron in th...

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PUM

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Abstract

The invention belongs to the technical field of casting processes for pressure discs, and particularly relates to a casting process for a clutch pressure disc. The casting process comprises the steps of molten iron preparation, molten iron standing and casting forming. Compared with the prior art, the casting process has the advantages that: pearlite content of a cast piece is increased, so that the metallographic structure and mechanical properties of the cast piece can meet requirements so as to perform nondestructive examination on the cast piece; examination requirements of radiographic inspection I-grade, ultrasonic flaw detection I-grade and magnetic powder inspection I-grade are met; the clutch pressure disc is manufactured through a casting method and a casting device; and a metal usage rate is increased by 40% or more, and working efficiency is improved by about 60%.

Description

technical field [0001] The invention belongs to the technical field of casting technology of a pressure plate, and in particular relates to a casting technology of a pressure plate of a clutch. Background technique [0002] The clutch pressure plate is an important structure on the clutch, which plays an important role in the driving safety of the car. In the prior art, castings are usually obtained by casting. The shape and size are very close to the parts, reducing the amount of cutting. It is a non-cutting process, but at the same time The problem of unstable casting quality. In order to ensure the performance requirements of the automotive pressure plate, there are relatively strict requirements on the chemical composition, metallographic structure, graphite morphology, tensile strength, hardness, etc. of the automotive pressure plate castings. In actual production, due to the The strength, plasticity and toughness of flake graphite in the middle are almost zero, which d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08C21D5/00
CPCC21D5/00C22C33/08C22C37/10
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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