Casting process for high-strength and low-alloy chilling spheroidal graphite cast iron camshaft blanks

A high-strength low-alloy, nodular cast iron technology, applied in the direction of metal processing equipment, casting molds, casting mold components, etc., can solve the problems of slow dry sand cooling casting speed, affecting casting quality, complex process, etc., to achieve stress relief process, Good economic benefit, prolonging the effect of collapse time

Inactive Publication Date: 2015-11-25
CHANGSHA YOUCHENG CAMSHAFTS MFR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this quenching process, the speed of dry sand cooling castings is slow, and there is a certain stress in the camshaft blank, which affects the quality of castings
In order to eliminate the stress of the camshaft blank, the tempering heat treatment process is usually adopted, which is complicated in process and high in energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A casting process for a high-strength low-alloy chilled ductile iron camshaft blank, comprising the following steps:

[0023] a. Make the camshaft shell mold according to the specifications. The manufacturing process can be as follows: After the shell mold model is preheated to a certain temperature, the coated sand is dropped on the template, and after a period of time, the coated sand is bonded together, that is Can form a shell with a certain thickness;

[0024] B, make iron box, put the shell type that makes in the step a into iron box, described each iron box places 4-6 cover shell type, described every cover shell type and adjacent iron box inner wall, every cover There are gaps between the shells; among them, the size of the iron box is designed according to the size of the camshaft, and different numbers of shells are placed according to the size of the iron box, which can be 4 sets, 5 sets or 6 sets, of course it is also possible It is designed to match other ...

Embodiment 2

[0030] A casting process for a high-strength low-alloy chilled ductile iron camshaft blank, comprising the following steps:

[0031] a. Make the camshaft shell type according to the specifications;

[0032] B, make iron box, put the shell type that makes in step a into iron box, described each iron box places 4 cover shell types, described every cover shell type and adjacent iron box inner wall, every cover shell type gaps are provided between them;

[0033] c. Use iron shot to fill the above-mentioned gap, and completely cover the shell type, so that the sprue cup of the shell type is exposed, which is convenient for pouring molten iron; preferably, the diameter of the iron shot is 2.5mm;

[0034] d. Pour the molten iron from the sprue cup and fill the shell-shaped cavity to complete the pouring;

[0035] e. After 4 hours of heat preservation, clean up the iron shot in the iron box, and take out the camshaft casting to obtain the camshaft blank. The heat preservation time c...

Embodiment 3

[0040] A casting process for a high-strength low-alloy chilled ductile iron camshaft blank, comprising the following steps:

[0041] a. Make the camshaft shell type according to the specifications;

[0042] B, make iron box, put the shell type that makes in the step a into iron box, described each iron box places 6 cover shell types, described every cover shell type and adjacent iron box inner wall, every cover shell type gaps are provided between them;

[0043] c. Use iron shot to fill the above-mentioned gap, and completely cover the shell shape, so that the sprue cup of the shell shape is exposed, which is convenient for pouring molten iron; preferably, the diameter of the iron shot is 4mm;

[0044] d. Pour the molten iron from the sprue cup and fill the shell-shaped cavity to complete the pouring;

[0045] e. After keeping warm for 5 hours, clean up the iron shot in the iron box, and take out the camshaft casting to obtain the camshaft blank.

[0046] In this process, t...

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Abstract

The invention discloses a casting process for high-strength and low-alloy chilling spheroidal graphite cast iron camshaft blanks. The casting process is characterized by including the following steps that a, camshaft shells are manufactured according to the specification; b, iron boxes are manufactured, the shells manufactured in the step a are placed in the iron boxes, each iron box contains 4 to 6 shells, and gaps are formed between each shell and the inner wall of the adjacent iron box and between the shells respectively; c, the gaps are filled with iron pills, the shells are completely covered, and casting ports of the shells are exposed outside so that molten iron can be cast conveniently; d, the molten iron is cast through the casting ports, cavities of the shells are filled with the molten iron, and casting operation is finished; and e, the temperature is kept for 3 to 5 hours, the iron pills in the iron boxes are removed, camshaft castings are taken out, and therefore the camshaft blanks are obtained. By the adoption of the casting process for the camshaft blanks, the stress of the camshaft blanks can be eliminated, the thermal treatment process can be omitted, and the process is simple.

Description

technical field [0001] The invention relates to a camshaft casting process, in particular to a casting process for a high-strength low-alloy chilled nodular cast iron camshaft blank. Background technique [0002] The camshaft is a shaft part and has high requirements for balance. Therefore, the dimensional accuracy, shape accuracy and other performance requirements of the camshaft are relatively high. At present, the commonly used casting method for camshafts is shell mold casting. This process method first needs to manufacture the camshaft shell mold. The shell mold manufacturing process is to preheat the shell mold model to a certain temperature, and then drop the coated sand on the template. After keeping it for a period of time, the coated sand will bond together and form a shell with a certain thickness. In the casting process of the camshaft, the shell mold is installed in the sand box, and dry sand is filled around the shell mold, and the casting is cooled by dry san...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/02
Inventor 欧俊华
Owner CHANGSHA YOUCHENG CAMSHAFTS MFR
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