Method for casting copper sleeve and piston into whole

A technology of copper sleeve and piston, which is applied in the field of mechanical casting, can solve the problems of accelerated wear, increased cost, and increased copper sleeve inner diameter out-of-roundness, and achieves the effects of increasing mechanical clamping force, reducing product cost, and increasing occlusal effect

A technology of copper sleeve and piston, which is applied in the field of mechanical casting, can solve the problems of accelerated wear, increased cost, and increased copper sleeve inner diameter out-of-roundness, and achieves the effects of increasing mechanical clamping force, reducing product cost, and increasing occlusal effect

CN103722154AActive Publication Date: 2014-04-16BINZHOU DONGHAILONG PISTON
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  • Method for casting copper sleeve and piston into whole
  • Method for casting copper sleeve and piston into whole
  • Method for casting copper sleeve and piston into whole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: A method of casting a copper sleeve and a piston into one body by squeeze casting, including the following steps: (1) First, process the piston according to the finished product drawing. Figure 5 , Image 6 with Figure 7 The semi-finished copper sleeve 8 is provided with an occlusal groove 3 on the outer circle of the semi-finished copper sleeve 8. The inner diameter of the semi-finished copper sleeve 8 is required to be Ο†1 = the inner diameter of the pin hole specified in the product drawing + cutting allowance, and it can match the pin hole axis of the model Fitting; the outer diameter of the semi-finished copper sleeve is required to be Ο†2 = the outer diameter of the copper sleeve specified in the product drawing;

[0030] β‘΅, produce such as image 3 with Figure 4 The piston extrusion mold consists of: fixed mold sleeve 4, fixed tire mold 5; wedge compression head 6, piston cavity 7, pin hole shaft 9, movable tire mold 10, movable mold sleeve 11 and wear-re...

Embodiment 2

[0035] Embodiment 2: The method of casting a copper sleeve and a piston into one body by squeeze casting includes the following steps:

[0036] β‘΄, first process the piston according to the finished drawing as Figure 5 , Image 6 with Figure 7 The semi-finished copper sleeve 8 is uniformly provided with three occluding grooves 3 on the outer circle of the semi-finished copper sleeve 8. The inner diameter of the semi-finished copper sleeve 8 is required to be Ο†1 = the inner diameter of the pin hole specified in the product drawing + the machining allowance, and it can match the model Pin hole shaft assembly; the outer diameter of the semi-finished copper sleeve is required Ο†2 = the outer diameter of the copper sleeve specified in the product drawing;

[0037] β‘΅, produce such as image 3 with Figure 4 The piston extrusion mold consists of: fixed mold sleeve 4, fixed tire mold 5; wedge compression head 6, piston cavity 7, pin hole shaft 9, movable tire mold 10, movable mold sleeve 1...

Embodiment 3

[0042] Embodiment 3: The method of casting a copper sleeve and a piston into one body by squeeze casting includes the following steps:

[0043] β‘΄, first process the piston according to the finished drawing as Figure 5 , Image 6 with Figure 7 The semi-finished copper sleeve 8 is uniformly provided with three occluding grooves 3 on the outer circle of the semi-finished copper sleeve 8. The inner diameter of the semi-finished copper sleeve 8 is required to be Ο†1 = the inner diameter of the pin hole specified in the product drawing + the machining allowance, and it can match the model Pin hole shaft assembly; the outer diameter of the semi-finished copper sleeve is required Ο†2 = the outer diameter of the copper sleeve specified in the product drawing;

[0044] β‘΅, produce such as image 3 with Figure 4 The piston extrusion mold consists of: fixed mold sleeve 4, fixed tire mold 5; wedge compression head 6, piston cavity 7, pin hole shaft 9, movable tire mold 10, movable mold sleeve 1...

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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 casting a copper sleeve and a piston into one body, 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 pistons are made of aluminum alloy as raw material and are made by gravity casting. Because aluminum alloy has poor pressure resistance and wear resistance, especially the piston pin seat hole bears high pressure, and the lubrication condition in the pin hole is not good. Therefore, the wear is fast, which affects the technical performance and service life of the engine. In order to solve this problem, many high-performance engines have a wear-resistant copper sleeve in the piston pin hole seat. However, how to install this kind of copper sleeve into the piston pin seat hole is a difficult problem that is not easy ...

Claims

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Application Information

Patent Timeline
16 Apr 2014
Publication
CN103722154A
IPC
B22D19/04; B22D18/02
Inventors
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