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A precision machining method for single-head boss ridge type globoidal indexing cam profile surface

A technology for indexing cams and convex profiles, applied in metal processing, metal processing equipment, metal processing machinery parts, etc., can solve the problems of not considering the enveloping properties of the cam profile, poor processing quality, method errors, etc.

Inactive Publication Date: 2006-11-22
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One disadvantage of using this traditional Fancheng method to process arc-shaped indexing cams is that both sides of the groove of the cam participate in milling at the same time, one side is down milling, and the other side is up milling, which makes the quality of the processed profile poor.
In response to this problem, there is a method of machining one side of the cam through tool radius compensation, but this machining method has theoretical errors; there is a method of processing the cam surface as a free-form surface, and using a spherical milling cutter for point processing , this processing method belongs to the point processing method, without considering the enveloping properties of the cam surface, the processing quality is poor, and the processing efficiency is low; there are single-side processing of the cam through double-enveloping processing methods, and this processing method has Method error, processing efficiency is not high

Method used

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  • A precision machining method for single-head boss ridge type globoidal indexing cam profile surface
  • A precision machining method for single-head boss ridge type globoidal indexing cam profile surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Example 1. refer to figure 1 , figure 2 . A method for finishing the working profile of a single-head convex ridge-type arc-shaped indexing cam. The profile of the arc-shaped indexing cam is processed by correcting the tool trajectory processed by the ordinary Fancheng method, and the work of the indexing section of the arc-shaped indexing cam is processed. The profile is divided into 1L, 2R, 2L and 3R four sections for processing, the method is as follows:

[0095] (1) When processing 1L section, when θ i 1jh When , the tool path correction is not performed, and the machining tool path is the same as that of the normal Fancheng method; when θ i > θ 1jh When the tool trajectory is corrected, the tool trajectory is based on the normal Fan Cheng method to process the tool trajectory, and it swings an angle Δφ to the solid side of the cam surface ixiu (1L), Δφ ixiu (1L) is calculated using the following formula:

[0096] Δφ ixiu (1L) = φ i -φ ixiu (1L)=S xiu *...

Embodiment 2

[0120] Example 2. According to the processing method shown in embodiment 1, according to the tool track calculation formula of the processing method, the corresponding tool track is calculated with a computer program, and the NC code is generated again, and input into the numerical control machine tool to realize the working profile of the single-head convex ridge type arc surface indexing cam surface finishing. The requirements for the selection of CNC machine tools are the same as those of ordinary Fan Cheng method; the adjustment and clamping methods of CNC machine tools are the same as those of ordinary Fan Cheng method; For the rough machining of the profile, the size of the tool used in rough machining is smaller than the size of the roller. The tool imitates the roller and moves according to the motion law of the cam mechanism. When semi-finishing and finishing the working profile of the arc-shaped indexing cam, the tool moves according to the tool trajectory of the pr...

Embodiment 3

[0121] Example 3. A single-head convex ridge type arc surface indexing cam profile surface finishing method, the basic parameters of the arc surface indexing cam mechanism: the rotation angle of the cam indexing period is 120 degrees, the number of rollers on the turntable is 8, the center distance is 180mm, the roller The radius is 22mm, the roller width is 24mm, the turntable pitch circle radius is 84mm, the cam width is 96mm, left-hand rotation, the movement law of the turntable indexing period is improved sinusoidal acceleration, the cam speed is 1000r / min, and the movement law S for tool track correction biao It is a sinusoidal acceleration, and the maximum correction amount of the tool swing angle in one indexing cycle is 20 degrees. The calculation of the tool path of the processing method of the present invention is as follows:

[0122] Work

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Abstract

The invention relates to a method for finishing machining the single-head convex arc divided cam profile, which is characterized in that: it corrects the knife track in general generated machine to machine the working profile of arc divided cam, to divide its profile surface into four sections as 1L, 2R, 2L, and 3R, to correct and analyze the knife track and supply the correct calculate formula. The invention can improve the general generated method, to correct the working profile surface of arc divided cam, to avoid the mesh interference between the roller and the cam profile surface, to make the section with better mesh transmission property (smaller pressure angle) with main mesh transmission. Therefore, it can improve the machining quality and correct the knife track.

Description

technical field [0001] The invention relates to a processing method of a cam, in particular to a single-head convex ridge-type arc surface indexing cam profile finishing method. Background technique [0002] The arc surface indexing cam mechanism realizes indexing and positioning by the cam working profile on the input shaft, and can convert the continuous rotary motion of the input into the intermittent rotary motion of the output. It is an intermittent indexing mechanism with excellent working performance and is widely used in various automatic machines. Due to the difficulty in manufacturing, the processing technology of the arc indexing cam mechanism has always been an important research issue that has been valued by people. [0003] The key to the machining and manufacturing of arc-shaped indexing cam mechanism is the machining of the cam working profile, which is usually processed by Fancheng method on the CNC machine tool with double rotary coor...

Claims

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Application Information

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IPC IPC(8): B23Q15/14B23C3/08G05B19/18
Inventor 唐学飞
Owner HUAIHAI INST OF TECH