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The Method of Casting Copper Sleeve and Piston into One

A copper sleeve and piston technology, applied in the field of mechanical casting, can solve problems such as accelerated wear, power reduction, and cost increase, and achieve the effects of increasing mechanical clamping force, eliminating casting stress, and simplifying the production process

Active Publication Date: 2016-03-30
BINZHOU DONGHAILONG PISTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This method of using interference fit between the copper sleeve and the piston pin seat hole has the following disadvantages: 1. If the interference is slightly large, the copper sleeve will have a large expansion during the operation of the engine under high temperature and high pressure, which will make the piston pin The increased deformation of the hole will reduce the matching accuracy of the piston and the cylinder liner, resulting in a decrease in power and accelerated wear of the two. What's more, it will increase the amount of out-of-round inner diameter of the copper sleeve, which will kill the floating piston pin;
[0007] 2. If the interference is slightly small, the copper sleeve and the pin seat hole will not fit tightly when the engine is running, resulting in relative rotation or axial movement, and even cylinder strain;
[0009] 4. There are many processes, which will increase the cost and reduce the production efficiency

Method used

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  • The Method of Casting Copper Sleeve and Piston into One
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  • The Method of Casting Copper Sleeve and Piston into One

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: the method that copper sleeve and piston are cast into one by squeeze casting comprises the following steps: (1) first process according to the piston finished product drawing as follows Figure 5 , Figure 6 and Figure 7 The copper sleeve semi-finished product 8 is provided with a occlusal groove 3 on the outer circle of the copper sleeve semi-finished product 8. It is required that the inner diameter φ1 of the copper sleeve semi-finished product 8 = the inner diameter of the pin hole specified in the product drawing + the machining allowance, and it can be matched with the pin hole axis of the model. Assembling; it is required that the outer diameter of the copper sleeve semi-finished product φ2 = the outer diameter of the copper sleeve specified in the product drawing;

[0030] ⑵, making such as image 3 and Figure 4 The piston extrusion die is composed of: fixed mold cover 4, fixed tire mold 5; wedge-shaped compression head 6, piston cavity 7, pin...

Embodiment 2

[0035] Embodiment 2: the method that copper sleeve and piston are cast into one by squeeze casting comprises the following steps:

[0036] ⑴, first process according to the finished piston drawing Figure 5 , Figure 6 and Figure 7 The semi-finished copper sleeve 8 has three occlusal grooves 3 evenly arranged on the outer circle of the semi-finished copper sleeve 8. It is required that the inner diameter φ1 of the semi-finished copper sleeve 8 = the inner diameter of the pin hole specified in the product drawing + the machining allowance, and it can be matched with the model. Pin-hole shaft assembly; the outer diameter of the semi-finished copper sleeve is required to be φ2 = the outer diameter of the copper sleeve specified in the product drawing;

[0037] ⑵, making such as image 3 and Figure 4 The piston extrusion die is composed of: fixed mold cover 4, fixed tire mold 5; wedge-shaped compression head 6, piston cavity 7, pin hole shaft 9, movable tire mold 10, movable...

Embodiment 3

[0042] Embodiment 3: the method that copper sleeve and piston are cast into one by squeeze casting, comprises the steps:

[0043] ⑴, first process according to the finished piston drawing Figure 5 , Figure 6 and Figure 7 The semi-finished copper sleeve 8 has three occlusal grooves 3 evenly arranged on the outer circle of the semi-finished copper sleeve 8. It is required that the inner diameter φ1 of the semi-finished copper sleeve 8 = the inner diameter of the pin hole specified in the product drawing + the machining allowance, and it can be matched with the model. Pin-hole shaft assembly; the outer diameter of the semi-finished copper sleeve is required to be φ2 = the outer diameter of the copper sleeve specified in the product drawing;

[0044] ⑵, making such as image 3 and Figure 4The piston extrusion die is composed of: fixed mold cover 4, fixed tire mold 5; wedge-shaped compression head 6, piston cavity 7, pin hole shaft 9, movable tire mold 10, movable mold cove...

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PUM

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Abstract

The invention discloses a method for casting a copper sleeve and a piston into a whole. The copper sleeve and the piston are cast into a whole by adopting an extrusion casting technology. Firstly, a mold is installed on an extruder in the extrusion process of the piston, the processed copper sleeve semi-finished product is arranged on a pin hole shaft of a piston extrusion model; aluminum melt is fully cast into a cavity, and extruded and cast, so that the copper sleeve semi-finished product and the piston are cast into a whole. The method comprises the following steps: 1, processing the copper sleeve semi-finished product according to a piston product drawing; 2, cleaning the copper sleeve semi-finished product, putting the cleaned copper sleeve semi-finished product into an electric furnace, preheating the copper sleeve semi-finished product, installing the copper sleeve semi-finished product on the pin hole shaft of a piston model, casting the aluminum melt into a piston cavity, and extruding and casting at the specific pressure of over 90Mpa; 3, carrying out heat treatment and machining on a piston product cast with the copper sleeve, and checking out to form the product. The piston produced by the method does not affect the matching precision of the piston and the cylinder due to the copper sleeve in operation of an engine, and the copper sleeve and a pin boss hole of the piston are tightly combined, and firm and reliable.

Description

technical field [0001] The invention relates to a method for integrally casting a copper sleeve and a piston, and belongs to the technical field of mechanical casting. Background technique [0002] The requirements of modern piston internal combustion engines for the pistons used are: small specific gravity, high temperature resistance and wear resistance. Now, most of the pistons are made of aluminum alloy and gravity casting, because the aluminum alloy has poor compression and wear resistance, especially the pressure of the piston pin seat hole is high, and the lubrication conditions in the pin hole are not good. Therefore, the wear is fast, which affects the technical performance and service life of the engine. In order to solve this problem, wear-resistant copper sleeves are inlaid in the holes of the piston pin hole seat of many high-performance engines, but how to install this copper sleeve into the piston pin seat hole is a problem that is not easy to control. The s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/04B22D18/02
Inventor 刘阁辉刘毅张伟斌
Owner BINZHOU DONGHAILONG PISTON