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Integrated grinding and strengthening process of micro alloy steel crankshaft neck and fillet

A technology of grinding strengthening and crankshaft journal, which is applied in the field of metal grinding, can solve the problems of low production efficiency, high manufacturing cost, thermal damage, etc., and achieve simplified production process, reduced energy consumption, fatigue strength and wear resistance Improved effect

Inactive Publication Date: 2008-08-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that at present, the process of induction quenching and strengthening treatment of non-quenched and tempered steel crankshaft journal and fillet surface, and then grinding has at least the following disadvantages: First, the parts are processed after surface quenching. Grinding may cause thermal damage to the hardened surface; second, the large amount of heat generated by grinding is not well utilized; third, energy consumption is large, the process route is long, production efficiency is low, and manufacturing cost is high

Method used

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  • Integrated grinding and strengthening process of micro alloy steel crankshaft neck and fillet
  • Integrated grinding and strengthening process of micro alloy steel crankshaft neck and fillet
  • Integrated grinding and strengthening process of micro alloy steel crankshaft neck and fillet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 (best implementation mode)

[0046] Table 1 Grinding strengthening parameters of Example 1

[0047] grinder

Special grinding machine for crankshaft journal and fillet

Grinding wheel

Corundum grinding wheel, abrasive grain size 80#

crankshaft material

48MnV

wheel speed v s / m / s

25m / s

Workpiece feed speed v w / m / min

0.2m / min

Grinding depth a p / mm

0.3mm

cooling method

Emulsion

Grinding method

Cut-in smooth grinding or reverse grinding

Wheel Dressing

Diamond trimming pen

[0048] Below in conjunction with the metallographic structure photo of the 48MnV micro-alloyed steel crankshaft journal and the fillet after the grinding strengthening of embodiment 1 (attached Figure 1~3 ), further illustrate the grinding strengthening effect and strengthening mechanism of the present invention.

[0049] figure 1 is the microhardness diagram of the grinding...

Embodiment 2

[0058] Table 2 Grinding Strengthening Parameters of Example 2

[0059] grinder

[0060] In the embodiment shown in Table 2, a martensitic strengthening layer with a thickness greater than 0.6mm can be formed, the microhardness of the strengthening layer can reach up to HV900 or more, and the surface residual stress is compressive stress.

Embodiment 3

[0062] Table 3 Grinding Strengthening Parameters of Example 3

[0063] grinder

[0064] In the embodiment shown in Table 3, a martensitic strengthening layer with a thickness greater than 1.4 mm can be formed, the microhardness of the strengthening layer can reach up to HV900 or more, and the surface residual stress is compressive stress.

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Abstract

The present invention belongs to the field of metal grinding technology, and is especially integrated grinding and strengthening process of micro alloy steel crankshaft neck and fillet. The present invention features that the crankshaft neck and fillet are ground directly without passing through induced heating surface hardening at workpiece feeding speed of 0.05-0.6m / min and grinding depth of 0.1-0.5mm. The technological process utilizes the grinding heat to replace induced heat for the surface reinforcement of the micro alloy steel crankshaft neck and fillet to reach integrated grinding and surface reinforcement, and has the advantages of low power consumption, high efficiency and low cost. The present invention can form submicron level or nanometer level martensitic structure and obtain high hardness, fatigue strength and wear resistance.

Description

technical field [0001] The invention relates to a micro-alloy steel crankshaft journal and fillet grinding and strengthening integrated process, which belongs to the technical field of metal grinding. Background technique [0002] Micro-alloyed steel, also known as micro-alloyed non-quenched and tempered steel, is obtained by adding micro-alloying elements vanadium (V), niobium (Nb) or titanium (Ti) to steel through temperature-controlled rolling (forging) and temperature-controlled cooling processes. A new type of energy-saving steel whose mechanical properties have reached the level of quenched and tempered steel. When using micro-alloy steel to manufacture mechanical parts, the quenching and tempering heat treatment process can be omitted, so the corresponding heat treatment equipment is also omitted, the production process is simplified, the energy consumption is reduced, the utilization rate of materials is improved, and the manufacturing cost is reduced. Known as "gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B5/42
Inventor 肖冰苏宏华徐鸿钧傅玉灿徐九华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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