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Fork for clutch and manufacturing method thereof

A manufacturing method and clutch technology, applied in clutches, mechanical drive clutches, manufacturing tools, etc., can solve problems such as increased production costs and low material yields

Inactive Publication Date: 2014-09-10
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, shift forks have been manufactured by forging high-strength steel in the past, but there are problems in that the production cost increases due to too many processes and low material yield.

Method used

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  • Fork for clutch and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In weight ratio, mix C:3.8%, Si:1.5%, Mn:0.3%, P:0.01%, S:0.01%, Cu:0.2% and Fe as the rest, put all raw materials into medium frequency induction resistance furnace The temperature of the nodular cast iron stock solution (stock solution) taken out from the furnace is 1500°C.

[0072] Spheroidizing and inoculating the stock solution of nodular cast iron taken out from the furnace after smelting, adding rare earth ferrosilicon-magnesium alloy (FeSiMg6RE1) equivalent to 1.1% of the mass of the stock solution as a spheroidizing agent, as an inoculation The agent added barium ferrosilicon alloy (FeSi72Ba2) equivalent to 0.15% of the mass of the stock solution. As a result, it was confirmed that the components (wt%) of the melt were C:3.8, Si:2.3, Mn:0.3, P:0.01, S:0.01, Cu:0.2, and Mg:0.04.

[0073] The melt that has been spheroidized and inoculated is injected into the pre-prepared wet sand mold. The temperature of the melt is controlled at 1398°C, and it is cooled after ...

Embodiment 2

[0077] C: 3.6%, Si: 1.6%, Mn: 0.26%, P: 0.008%, S: 0.01%, Cu: 0.2%, and the rest of Fe are mixed and melted, taken out at 1510°C, and put into the stock solution to melt 1.1% FeSiMg6RE1 of liquid mass and 0.15% FeSi72Ba2 of raw liquid mass. The composition (wt %) of the melt subjected to the spheroidization treatment and the inoculation treatment was C: 3.6, Si: 2.3, Mn: 0.3, P: 0.008, S: 0.012, Cu: 0.3, and Mg: 0.045.

[0078] After that, the wet sand film is injected at a temperature of 1403°C for 8 minutes and then cooled. After machining the semi-finished product of the shift fork, it is subjected to austempering treatment. At this time, heat the semi-finished product of the shift fork to 910°C, keep it for two hours, and then put it into the nitrate solution at 350°C for 1.5 hours. Thereafter, after cooling to room temperature in the air, fine grinding and polishing are performed.

Embodiment 3

[0080] C: 3.4%, Si: 1.8%, Mn: 0.3%, P: 0.01%, S: 0.013%, Cu: 0.25% are mixed and melted as the rest of Fe, taken out at 1515°C, and put into the stock solution 1.1% FeSiMg6RE1 by mass and 0.15% FeSi72Ba2 by stock solution mass. The composition (wt%) of the molten solution subjected to spheroidization treatment and inoculation treatment was C:3.4Si:2.35, Mn:0.3, P:0.01, S:0.013, Cu:0.25, Mg:0.04.

[0081]Afterwards, inject the wet sand film at a temperature of 1410°C for 8 minutes and then cool it down. After machining the semi-finished product of the shift fork, it is subjected to austempering treatment. At this time, heat the semi-finished product of the shift fork to 920°C, keep it for two hours, and then put it into the nitrate solution at 360°C for 1.5 hours. Thereafter, after cooling to room temperature in the air, fine grinding and polishing are performed.

[0082] figure 1 For the photograph of the internal organization of above-mentioned embodiment 1, refer to fig...

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Abstract

A fork for a clutch and a manufacturing method thereof are provided. The fork for a clutch may include C: 3.4˜3.9%, Si: 2.1˜2.5%, Mn: 0.2˜0.7%, P: 0.01% or less, S: 0.009˜0.02%, Cu: 0.2˜0.4%, and Mg: 0.04˜0.07% by weight ratio, with the remainder including iron (Fe) and other impurities. The material forming the fork for the clutch may have a structure in which spheroidal graphite is precipitated in an austenite matrix structure.

Description

technical field [0001] The invention relates to a shift fork for a clutch and a manufacturing method thereof, in particular to a shift fork constituting a clutch used in an automobile transmission and a manufacturing method thereof. Background technique [0002] Generally, the clutch of a manual transmission of a vehicle uses a pressure plate to press the clutch disc against the flywheel to transmit power, and when the flywheel is released from the clutch disc, the power is cut off and the shift mode is switched. Thus, when the gear needs to be changed, the driver depresses the clutch, and the pedal force is transmitted to the shift fork to run the clutch release bearing, thereby disengaging the clutch. [0003] Therefore, the above-mentioned shift fork must not only have wear resistance to prevent wear caused by friction with opposing members, but also have impact resistance to withstand the impact transmitted during shifting. For this reason, conventionally, the shift for...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21D1/20C21D9/00
CPCB22D23/02C22C37/04B22D31/002C21C1/10F16D23/12C21C1/105F16D2023/141C22C33/08C22C33/10C22C37/10
Inventor 朴载奉
Owner LG ELECTRONICS INC
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