Method and device for improving quality of squeezing and casting piston casting

A squeeze casting and squeeze casting machine technology, applied in the field of improving the quality of squeeze casting piston castings, can solve the problems of poor pressurization effect, high mold temperature requirements, uneven mechanical properties of pistons, etc., and achieve the improvement of slag collection ability and reduction Small handle thickness, excellent molding effect

Active Publication Date: 2017-05-10
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, domestic and foreign squeeze casting pistons generally adopt single direct squeeze casting, indirect squeeze casting, or assist local pressurization at the same time of single squeeze casting. Contact and surface oxide film cannot be effectively discharged, indirect squeeze casting has poor pressurization effect, high mold temperature requirements, and the final solidification position is located in the middle of the thick wall of the piston. Uneven

Method used

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  • Method and device for improving quality of squeezing and casting piston casting
  • Method and device for improving quality of squeezing and casting piston casting
  • Method and device for improving quality of squeezing and casting piston casting

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: Schematic diagram of the structure of the squeeze casting piston mold is as follows figure 1 shown. Utilize three-dimensional software UG modeling to described extrusion die device, measure by numerical simulation software ProCAST, as Figure 4 shown.

[0031] At present, the conventional indirect extrusion casting piston mold does not pass cooling water and adopts expansion gate. When the mold temperature is 300°C, the extrusion barrel is 400°C, the filling temperature of Zl109 is 680°C, and the filling speed is 32.5mm / s, the piston The top of the casting is the final solidification position, and the shrinkage and shrinkage cavities are concentrated at the center of the top of the casting, which cannot be removed by machining.

[0032] This example verifies that Niyama Criterion shows that piston castings have a low tendency of shrinkage and shrinkage, and are concentrated in the expansion of the gate, which can be removed by machining. The piston is f...

Embodiment 2

[0034] Example 2: The horizontal squeeze casting machine used in this example is Suzhou Sanji SCH180 squeeze casting machine, the clamping force is 1800KN, and the conveying system uses manual weighing Zl109 to melt and rise to 700°C, and pour the extrusion material quantitatively Barrel 9.

[0035] Realize the schematic diagram of the mold structure of this embodiment as image 3 shown.

[0036] 1. After the mold is designed, the present embodiment utilizes the existing extrusion casting mold to improve; the fixed mold core 1 and the movable mold core 5 of the mold adopt H13, and the fixed mold 2 and the movable mold 6 adopt No. 45 steel;

[0037] 2. When the present embodiment utilizes the existing squeeze casting mold, the mold inner gate 13 of the mold is cut into a 120° expansion gate;

[0038] 3. Install the squeeze casting mold: Press the produced squeeze casting mold image 3 The shown is installed on the SCH180 horizontal squeeze casting machine;

[0039]4. Vertic...

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PUM

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Abstract

The invention relates to a method and device for improving quality of a squeezing and casting piston casting and belongs to the technical field of castings. Based on the situation that when the connection position between a material handle and the casting and the outer surface of the casting forms an divergence angle, the state of molten metal can be steadier in the mold filling process, and turbulent flow is prevented; a material handle neck is shortened, cutting of a shrinkage supplement channel in a piston in the solidification process is delayed, the molten metal in an expansion opening can be used for shrinkage supplement, and the shrinkage porosity and shrinkage cavity rate is lowered; and a piston mold is preheated, the requirement for the mold filling temperature is lowered, and a molten pool in the top of the piston is downwards moved ad convenient to cut, machine and remove.

Description

technical field [0001] The invention relates to a method and a device for improving the quality of extrusion casting piston castings, belonging to the technical field of casting. Background technique [0002] Squeeze casting is to pour a certain amount of liquid metal directly into an open metal mold, and then close the mold to realize the filling and flow of molten metal, and high-pressure solidification and plastic deformation occur under the action of mechanical static pressure, which has the advantages of refining grains and accelerating solidification. The speed and the function of homogenizing the structure, so as to obtain the forming and manufacturing technology of blanks or parts whose mechanical properties are higher than those of other common castings. According to the flow condition of alloy liquid and the form of squeeze casting force during squeeze casting, squeeze casting can be divided into two basic forms: direct squeeze casting and indirect squeeze casting....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/02B22D18/08
CPCB22D18/02B22D18/08
Inventor 陈刚袁方今张再磊孟明艾刘梦璐
Owner JIANGSU UNIV
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