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A hole extrusion multiple strengthening device and method

A technology of strengthening device and hole extrusion, applied in the field of hole processing equipment, can solve the problems of high resource consumption, low processing efficiency, complex processing technology, etc., and achieve the effect of improving strengthening effect, improving processing efficiency and improving processing efficiency.

Active Publication Date: 2021-09-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventors found that compound hole extrusion is a combined process of mandrel hole extrusion and bushing hole extrusion, which requires a mandrel light hole extrusion before ordinary bushing hole extrusion, which can be done first on the component The matrix forms a high-strength residual compressive stress field, and appropriately expands the initial pore diameter, which is beneficial to the bushing assembly; although the composite hole extrusion has great advantages in maintaining the shape of the hole member and improving the strengthening effect, its processing technology is complicated. In addition to directly extruding the bushing after the bushing and the holed member are pre-assembled, the technicians also increase the extrusion of the light-hole mandrel before the bushing and the hole wall are assembled, resulting in higher resource consumption and higher cost. low processing efficiency

Method used

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  • A hole extrusion multiple strengthening device and method
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  • A hole extrusion multiple strengthening device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In a typical implementation of the present disclosure, such as Figure 1-Figure 5 As shown, a hole extrusion multiple reinforcement device is proposed.

[0040] It mainly includes a mandrel, and the mandrel includes a first mandrel and a second mandrel, which are determined as the first mandrel at the front end and the second mandrel at the rear end in the order of passing through the hole 10 to be processed;

[0041] The function of the first mandrel is to extrude the light hole of the member with holes, and the function of the second mandrel is to extrude the bushing.

[0042] Both the first mandrel and the second mandrel have respective working ends, and the diameter of the working ends determines the size of the interference of the light hole or the extrusion process of the bushing.

[0043] The butt joint between the first mandrel and the second mandrel is the middle position of the whole mandrel, which is a columnar area with constant diameter. During subsequent ...

Embodiment 2

[0066] In another typical implementation of the present disclosure, such as Figure 1-Figure 5 As shown, a hole extrusion multiple strengthening method is proposed, using the hole extrusion multiple strengthening device as described in Example 1.

[0067] Include the following steps:

[0068] Disassemble the first mandrel and the second mandrel, and set the bushing on the first mating section or the second mating section, butt the first mandrel and the second mandrel, so that the bushing is constrained outside the sheathing part lock up;

[0069] Apply lubricating fluid to the first mandrel, second mandrel, bushing and the wall of the hole to be treated before extrusion strengthening, and apply an external load to the mandrel, and drive the mandrel to pass through the hole to be treated and the bushing in sequence Pass;

[0070] performing first extrusion strengthening on the wall of the hole to be treated by using the first mandrel, and passing the first mandrel through th...

Embodiment 3

[0085] In yet another embodiment of the present disclosure, another hole extrusion multiple strengthening method is given by taking the press-fit bushing to strengthen the ear piece of 2024 aluminum alloy with holes as an example.

[0086] Include the following:

[0087] The bushing material is 300M steel, and the mandrel material is W18Gr4VCo5 tool steel. Such as figure 1 As shown, the member with a hole is an ear part, and the inner diameter of the hole is 40mm. The bushing used has an outer diameter of 40.4mm and an inner diameter of 34mm. It is required that the interference of the smooth hole extrusion of the perforated member is 2.5%, and the interference of the bushing extrusion is 1.5%.

[0088] 1. Preparation and processing integrated mandrel;

[0089] Such as figure 2 , 3 As shown, this step requires the mandrel to be divided into two sections, which are determined as the front end in the order of passing through the hole ( figure 2 ) and the backend ( ima...

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Abstract

The disclosure provides a hole extrusion multiple strengthening device and method, which relate to the field of hole processing equipment, including a first mandrel and a second mandrel arranged coaxially and butted at the ends, and the first mandrel is sequentially provided with guides along the axial direction. section, the first reducing section and the first matching section, the second mandrel is provided with the second matching section and the second reducing section in sequence along the axial direction, the first matching section and the second matching section have the same diameter and are butted to form a The diameter of the large-diameter end of the first reducing section and the second reducing section is greater than the diameter of the sleeved part of the cylindrical sleeve of the bushing, facing the holed member that needs to be pressed to meet the assembly requirements. By improving the structure of the mandrel and preparing the multi-extrusion integrated mandrel, one-time continuous extrusion treatment of the hole wall and bushing required for the extrusion strengthening of the member with holes can greatly improve the processing efficiency and Further improved the enhancement effect.

Description

technical field [0001] The present disclosure relates to the field of hole processing equipment, in particular to a hole extrusion multiple strengthening device and method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Parts with holes are prone to fatigue fracture failure in the mechanical structure. Usually, the method of hole extrusion is used to introduce a certain depth of residual compressive stress field around the hole of the part to improve its fatigue life. Hole extrusion processing of metal material components mainly includes mandrel smooth hole extrusion and bushing hole extrusion. Bushing extrusion is to meet the assembly needs or protect the hole wall, and the hole member is added to the bushing before the extrusion process. In the actual industrial production process, in order to further improve the strengthening effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/04
CPCC21D7/04
Inventor 卢国鑫王强裴旭高荣王欣李恒
Owner SHANDONG UNIV
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