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Spiral fluted tap and method for processing same

A technology of spiral groove and tap, applied in the field of spiral groove tap and its processing, can solve the problems of inconsistency and difficult edge shape design of spiral groove milling cutter.

Inactive Publication Date: 2012-04-18
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, if the tap has a reasonable cutting angle and chip flute structure parameters, it needs to be manufactured strictly according to the tap groove shape. The shape curve is consistent, and the shape of the groove blade does not need to be designed separately; if it is a spiral groove tap, the helical surface of the tap is the envelope surface formed when the rotating surface of the milling cutter blade is in a spiral motion relative to the tap. This rotating surface and the spiral groove of the tap The contact line of the spiral groove milling cutter is not in the axial section of the spiral groove milling cutter, and the contact line is a spatial curve; the axial section of the turning surface of the spiral groove milling cutter is different from the normal section of the spiral groove of the workpiece, and is also different from any section of the workpiece. The truncated shape of the groove milling cutter, that is, the edge shape of the groove milling cutter and the edge shape of the grinding wheel are inconsistent with the groove shape of the tap, which makes it very difficult to design the edge shape of the spiral groove milling cutter

Method used

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  • Spiral fluted tap and method for processing same
  • Spiral fluted tap and method for processing same
  • Spiral fluted tap and method for processing same

Examples

Experimental program
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Embodiment 1

[0099] like figure 1 , figure 2 and image 3 As shown, in the present embodiment, the tap body 1 is an M10 tap, and the outer diameter D of the tap body 1 is required to be 10mm, the core diameter d=4mm, the width of the tap backside B=1.5mm, and the number of tap helical grooves Z =3, the offset of the cutting arc e=1.5mm, and the relief angle of the tap θ=25°.

[0100] The radius of the cutting arc ρ = D 2 = 5 mm , And the center coordinates (j, k) of the cutting arc are: j = e - ρ = - 3.5 k = D 2 ...

Embodiment 2

[0153] In this embodiment, the specific structure of the taps 1 to be processed and formed is exactly the same as that of Embodiment 1, that is, they are all M10 taps and the specific dimensions are the same.

[0154] The difference from Example 1 is that when the M10 tap is actually processed, the cutting tool used is a grinding wheel, and the outer diameter of the grinding wheel is D s =80mm, the shortest distance A=42mm between the central axis of the grinding wheel and the central axis of the M10 tap. Correspondingly, when using the grinding wheel to actually manufacture the M10 tap, the processing process includes the following steps:

[0155]Step 1, preparation before processing, this step is identical with embodiment 1.

[0156] Step 2, using a milling cutter fitted with a blade shape by a computer to process spiral grooves on the preliminary workpiece, the machining process is as follows:

[0157] 201. Use the computer to fit the blade shape of the grinding wheel use...

Embodiment 3

[0178] In this embodiment, the specific structure of the taps 1 to be processed and formed is exactly the same as that of Embodiment 1, that is, they are all M10 taps and the specific dimensions are the same.

[0179] The difference from Example 1 is that when the M10 tap is actually processed and manufactured, the step (h) is based on the plurality of discrete points (R i ,Z i ), and combined with the outer diameter of the milling cutter used, when the blade shape of the milling cutter used is fitted by the computer, the data modeling method is used for fitting, and when fitting, the multiple discrete points (R i ,Z i ) are drawn on a piece of coordinate paper, and then according to the multiple discrete points (R i ,Z i ) coordinate change rule to find a similar function with a fitting error smaller than the target error for segmental fitting, and then combine the segmental fitting functions to obtain the edge shape of the milling cutter. All the rest are the same as in ...

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Abstract

The invention discloses a spiral fluted tap and a method for processing the same. The spiral fluted tap comprises a tap body provided with a plurality of uniformly distributed spiral flutes on a front cut part, wherein the spiral flute is an S-shaped smooth curved groove formed by sequentially connecting four sections of tangential circular arcs end to end; and the four sections of tangential circular arcs are a cutting circular arc, a chip curling circular arc, a chip accommodating circular arc and a blade back circular arc respectively. The method for processing the spiral fluted tap comprises the following steps of: (1) preparing before processing; (2) processing the spiral flute by a special tool: fitting a blade shape of a cutter by a computer, and then manufacturing the cutter according to the fitted cutter blade shape so as to process the spiral flute; and (3) carrying out subsequent treatment by using a machining process so as to obtain a finished product of the tap body. The spiral fluted tap processed by the method has simple structure and can be molded in one step. Moreover, the processing method is suitable for different processing materials, particularly for processing fluted taps made of light alloys, such as an aluminum alloy and the like.

Description

technical field [0001] The invention belongs to the technical field of metal cutting tools and processing thereof, in particular to a spiral groove tap and a processing method thereof. Background technique [0002] When processing light alloy materials such as aluminum alloy, the chip space of the spiral flute of the tap should be selected larger, and the blade width should be selected smaller. However, the size parameters of the flute shape of the tap cannot be changed with the different processing materials and processing specifications. Therefore, the same groove shape is used when processing low carbon steel, cast iron, medium carbon steel and light alloy, especially for soft and sticky materials. The current standard groove shape is easy to cause sticking and chip blocking, and the processing surface The finish is low; in addition, when the processing material is soft, if the chip space of the tool is not large, the chip removal will be difficult, which will affect the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23G5/06B23P15/52
Inventor 贾建军王洪喜陈晓东于小宁
Owner XIAN TECH UNIV
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