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A process method for improving the surface hardness of the journal at the rear end of the engine crankshaft

A technology of surface hardness and process method, applied in the field of mechanical processing, can solve the problems of high energy consumption, difficult process, and difficult control.

Active Publication Date: 2020-02-14
桂林福达曲轴有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the surface of the crankshaft oil seal is not strengthened during the machining stage, the oil seal is easy to wear due to the low hardness, and the medium frequency induction quenching for the oil seal of the crankshaft is difficult to control the quenching layer, consumes a lot of energy, and the ductile iron crankshaft does not Disadvantages such as applicable

Method used

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  • A process method for improving the surface hardness of the journal at the rear end of the engine crankshaft
  • A process method for improving the surface hardness of the journal at the rear end of the engine crankshaft

Examples

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Embodiment 1

[0032] A process method for improving the surface hardness of a journal at the rear end of an engine crankshaft, comprising the following steps:

[0033] 1) For the surface hardness improvement process of the rear end of the crankshaft that does not require the rear end bearing hole of the finishing car, including:

[0034] (1-1) Turn and mill the two ends of the crankshaft blank and drill the center hole on the two ends of the blank;

[0035] (1-2) Use a CNC lathe to turn the outer circle of the rear end of the big head. The CNC lathe is e-CA6140 and EL6140. The machining allowance reserved for turning the outer circle of the rear end of the big head is 0.45-0.65mm, and the required roughness is Ra6.3 -Ra1.6μm, the CNC lathe in this example is e-CA6140 CNC lathe;

[0036] (1-3) Carry out normal processing of the main journal, connecting rod journal and oil hole, and carry out journal quenching combined with fillet rolling strengthening for the main journal and connecting rod...

Embodiment 2

[0046] A process method for improving the surface hardness of a journal at the rear end of an engine crankshaft, comprising the following steps:

[0047] 2) For the surface hardness improvement process of the rear end of the crankshaft that requires the rear end bearing hole of the finish car, including:

[0048] (2-1) Turn and mill the two ends of the crankshaft blank and drill the center hole on the two ends of the blank;

[0049] (2-2) The outer circle of the rear end of the rough car;

[0050] (2-3) Carry out normal processing of main journal and connecting rod journal and drill oil holes;

[0051] (2-4) Use CNC lathe to finish turning the rear end big head and boss. The CNC lathes are e-CA6140 and EL6140. When finishing the outer circle of the rear end big head, the machining allowance is 0.5-0.6mm, and the required roughness is Ra12. 5-Ra6.3μm, the CNC lathe in this example is e-CA6140 CNC lathe;

[0052] (2-5) Use ordinary lathes to turn the big head hole at the rear...

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Abstract

The invention discloses a technological method for increasing surface hardness of a journal at the rear end of an engine crankshaft. The technological method comprises the following steps: (1-1) turn-milling a crankshaft blank, and drilling central holes; (1-2) turn-milling a rear-end big-head excircle; (1-3) strengthening a main journal and a connecting rod journal; (1-4) turn-milling a rear-endbig-head hole; (1-5) processing a front-end threaded hole, a rear-end flange hole and a key slot; (1-6) performing finish machining to obtain an end product; (2-1) turn-milling a crankshaft blank anddrilling central holes; (2-2) rough-turning a rear-end big-head excircle; (2-3) processing a main journal and a connecting rod journal and drilling an oil hole; (2-4) fine-turning a rear-end big headand a lug boss; (2-5) turning a rear-end big-head hole; (2-6) strengthening a journal and processing a front-end threaded hole; (2-7) performing semi-refining on the rear-end big-head excircle; (2-8)fine-turning a rear-end bearing hole; and (2-9) performing finish machining to obtain an end product. The technological method is simple and practical in process, low in cost, high in efficiency and easy to popularize, saves energy, protects the environment and can effectively improve the abrasion resistance of oil seal parts at the rear ends of various crankshafts.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a process method for improving the surface hardness of a journal at the rear end of an engine crankshaft. Background technique [0002] The crankshaft is one of the core parts of the engine. The force on the crankshaft is quite complicated when the engine is working. It mainly bears repeated bending and torsional loads and strong friction under high-speed rotation. In order to improve the fatigue strength and wear resistance of the crankshaft to achieve good use Performance, the journal must be strengthened during crankshaft machining. At present, the most commonly used strengthening methods in crankshaft processing are: nitriding, fillet rolling, induction hardening, that is, fillet quenching and journal quenching, and composite strengthening, such as fillet rolling combined with journal quenching, and most engine crankshafts and oil seals The front and rear jou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 黄学文夏志成
Owner 桂林福达曲轴有限公司