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Method for determining torque of internal thread cold extrusion molding

A determination method and cold extrusion technology, applied to the determination of the forming torque of internal thread cold extrusion, in the field of internal thread cold extrusion processing, can solve problems such as few factors to consider and poor accuracy

Active Publication Date: 2012-10-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for determining the forming torque of internal thread cold extrusion that comprehensively considers various forming factors in view of the problems of less considerations and poor accuracy in the calculation of existing internal thread cold extrusion torque

Method used

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  • Method for determining torque of internal thread cold extrusion molding
  • Method for determining torque of internal thread cold extrusion molding
  • Method for determining torque of internal thread cold extrusion molding

Examples

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Effect test

example 1

[0089] M35 high-speed steel extrusion taps are selected, and the surface is coated with TiN. The structure is a hexagonal closed conical tooth structure. The structural parameters of the extrusion taps are: the length of the extrusion taper (l 1 ) 9mm, correction part length (l 2 ) 15mm, extrusion cone angle 4°50', the amount of shovel back is 0.65mm. The test machine is a 6140 lathe. The test material is Q460 high-strength steel, and the mechanical parameters of the workpiece material at room temperature: tensile strength (σ b ) is 925MPa, the yield strength (σ s = σ 0.2 ) is 810MPa, elongation (δ 5 ) was 18.56%. Processing parameters: workpiece height 20mm, bottom hole diameter Φ21.25mm, machine speed 25r / min, using PDMS polydimethylsiloxane coolant to lubricate the extrusion tap, then the theoretical torque can be obtained through the mechanical model of formula 1 curve (see figure 1 ) and the maximum value of the theoretical torque (see Table 1).

[0090] Table 1...

example 2

[0093] M35 high-speed steel extrusion taps are selected, and the surface is coated with TiN. The structure is a hexagonal closed conical tooth structure. The structural parameters of the extrusion taps are: the length of the extrusion taper (l 1 ) 9mm, correction part length (l 2 ) 15mm, extrusion cone angle 4°50', the amount of shovel back is 0.65mm. The test machine is a 6140 lathe. The test material is 2A12 aluminum alloy, the mechanical parameters of the workpiece material at room temperature: tensile strength (σ b ) is 460MPa, the yield strength (σ s =σ 0.2 ) is 360MPa, elongation (δ 5 ) is 16%. Processing parameters: the height of the workpiece is 20mm, the diameter of the bottom hole is Φ21.25mm, the speed of the machine tool is 25r / min, and the extrusion tap is lubricated with PDMS polydimethylsiloxane coolant, the theory can be obtained through the mechanical model of formula 1 Maximum torque (see Table 2).

[0094] Table 2 Comparison of mechanical model calc...

example 3

[0097] M35 high-speed steel extrusion taps are selected, the surface is coated with TiN, and the structure is a hexagonal closed conical tooth structure. Structural parameters of extrusion tap: length of extrusion taper (l 1 ) is 9mm, corrected part length (l 2 ) is 15mm, extrusion cone angle It is 4°50', and the amount of shovel back is 0.65. The experimental machine tool is 6140 lathe. The test material is Q460 high-strength steel, and the mechanical parameters of the workpiece material at room temperature: tensile strength (σ b ) is 925MPa, the yield strength (σ s =σ 0.2 ) is 810MPa, elongation (δ 5 ) was 18.56%. Processing parameters: workpiece height 20mm, bottom hole diameters are Φ21.15mm, Φ21.20mm, Φ21.30mm, Φ21.35mm, machine speed 25r / min, using PDMS polydimethylsiloxane coolant to extrude taps Lubrication, the theoretical maximum torque can be obtained through the mechanical model of formula 1 (see Table 3).

[0098] Table 3 Comparison table between mechani...

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Abstract

The invention discloses a mechanical model for determining the torque of internal thread cold extrusion molding, characterized by acquiring the function relation of time, extruding workpiece material, extruding tap structural parameters and extruding technological parameters by hypothesis and simplification based on an internal thread cold extrusion molding mechanism and a theory of plastic mechanics. Test data show that the theoretical torque value calculated by the mechanical model is consistent with the test value, and has some engineering research values.

Description

technical field [0001] The invention relates to a mechanical processing technology, especially a cold extrusion processing technology for internal threads, specifically an internal thread used to predict the torque required for cold extrusion of internal threads and provide a basis for determining the process parameters of processing equipment. Determination method of cold extrusion forming torque. Background technique [0002] As we all know, the cold extrusion forming of internal thread is different from the traditional cutting and tapping. It is a new internal thread forming process. It uses the edge teeth of the taper part of the extrusion tap to extrude the workpiece metal of the prefabricated bottom hole multiple times. The process of producing plastic deformation to form internal threads. During the cold extrusion forming process of the internal thread, due to the discontinuity of the stress distribution on the contact surface between the workpiece and the extrusion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00
Inventor 黎向锋左敦稳黄小龙缪宏史大彬康晓军邱佳斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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