Quenched steel long axis excircle and thread hard turning machining process

A processing technology, quenched steel technology, applied in the field of long-axis processing, can solve the problems of low processing efficiency and low processing precision of thread raceway, and achieve the effect of improving processing efficiency, processing accuracy and reducing equipment investment

Inactive Publication Date: 2012-10-24
池州市邦鼐机电科技有限公司
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AI Technical Summary

Problems solved by technology

[0002] The machining accuracy of the outer circle and the threaded raceway of quenched steel slender shafts (length-to-diameter ratio > 2

Method used

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[0039] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further explained below.

[0040] The main technical points of this process method are as follows: 1. Workpiece state control: the workpiece hardness is HRc52-65, the axial and radial hardness gradient of the cutting layer is within HRc3, the workpiece radial runout is controlled at 0.05mm / 1000mm, and the cylindricity is controlled. Within 0.03, the surface roughness is within Ra3.2; the coaxiality between the center hole at both ends of the workpiece and each journal is within 0.03. 2. Tool: According to the hardness of hardened steel, ceramic blades below HRC55 are used, and polycrystalline cubic boron nitride (PCBN) blades are used for HRC56-65. The shape of the blade is based on the needs of turning the outer circle and the thread. Choose an outer blade or a diamond blade. 3. The CNC lathe requires good overall rigi...

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Abstract

The invention discloses a quenched steel long axis excircle and thread hard turning machining process. A numerically controlled lathe is adopted for turning machining; and a ceramic cutter or a PCBN (Polycrystalline Cubic Boron Nitride) cutter is adopted according to different hard ranges of workpieces. The excircle surface roughness of a workpiece machined by using the process can be Ra0.8mm; the cylindricity is controlled within 0.02mm; the stroke-leading precision of a thread rolling track can be up to P7; and the cylindricity is within 0.02mm. Furthermore, according to the process, a condition that once machining is performed by the lathe is needed; the rough grinding procedure in the prior art is omitted; and moreover, no cutting liquid needs to be added while machining; and the machining efficiency is greatly improved, the investment on equipment is reduced, cooling liquid is not required, and the process belongs to green cutting processes which are efficient and environmental-friendly.

Description

technical field [0001] The invention relates to the technical field of long shaft processing, in particular to a hard turning process for the outer circle and thread of a long shaft of quenched steel. Background technique [0002] In the prior art, the processing accuracy of the outer circle and the threaded raceway of the quenched steel slender shaft (length-to-diameter ratio>25) parts is not high. Moreover, a coarse grinding program is required, and the processing efficiency is relatively low. Contents of the invention [0003] The technical problem to be solved by the present invention lies in a hard turning process of hardened steel long axis outer circle and thread which is proposed in view of the technical defects in the prior art. This processing technology controls the state of the workpiece, selects the cutting tool and CNC lathe according to the state of the workpiece, and optimizes the speed of the blade. In this way, the high-precision machining of the out...

Claims

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Application Information

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IPC IPC(8): B23B1/00
Inventor 胡建东潘培道赵永芹陈平
Owner 池州市邦鼐机电科技有限公司
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