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Hub casting method

A wheel hub and range technology, applied in the field of wheel hub casting based on lost foam casting technology, can solve the problems of wrinkled carbon black, carbon defects, sticking sand and other problems of ductile iron castings, preventing carbon defects and sticking sand, reducing carbon defects, Density-enhancing effect

Inactive Publication Date: 2019-02-05
ANHUI HELI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing lost foam casting hub scheme is likely to lead to the formation of wrinkled carbon black in ductile iron castings, and the castings are prone to carbon defects and sand sticking problems

Method used

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Examples

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Effect test

specific Embodiment 1

[0021] The present invention is a wheel hub casting method, comprising the following steps:

[0022] Make the pattern, the pattern includes: EPMMA: 65% and EPS: 25%; the density of the pattern is 18kg / m3, and the combination and drying operation is carried out after the pattern is made;

[0023] Prepare the coating and stir evenly, the Baume degree of the coating is 65°Bé, then dip coating and drying, wherein the layer thickness of the coating is 0.6mm;

[0024] Put the sand box on the vibrating table, the vibration frequency of the vibrating table is 45Hz, the vibration amplitude is 0.4mm, and the vibration time is 55s, then fill the bottom sand into the sand box and vibrate and scrape it, and then dry it The completed pattern is placed on the bottom sand, and filled with mold dry sand with a particle size of 30 meshes. After the mold dry sand is vibrated, the molten metal is poured. The vacuum negative pressure during pouring is 0.04MPa, and the temperature during pouring is...

specific Embodiment 2

[0027] The present invention is a wheel hub casting method, comprising the following steps:

[0028] Make a pattern, which includes: EPMMA: 75% and EPS: 25%; the density of the pattern is 21kg / m3, and the combination and drying operations are performed after the pattern is made;

[0029] Prepare the coating and stir evenly, the Baume degree of the coating is 75°Bé, then dip coating and drying, wherein the layer thickness of the coating is 0.8mm;

[0030] Put the sand box on the vibrating table, the vibration frequency of the vibrating table is 55Hz, the vibration amplitude is 0.6mm, and the vibration time is 65s, then fill the bottom sand into the sand box and vibrate and scrape it, and then dry The completed pattern is placed on the bottom sand, and filled with mold dry sand with a particle size of 40 meshes. After the mold dry sand is vibrated, the molten metal is poured. The vacuum negative pressure during pouring is 0.05MPa, and the temperature during pouring is 1470°C. ,...

specific Embodiment 3

[0032] The present invention is a wheel hub casting method, comprising the following steps:

[0033] Make a pattern, which includes: EPMMA: 70% and EPS: 30%; the density of the pattern is 19.5kg / m3, and the combination and drying operations are performed after the pattern is made;

[0034] Prepare the coating and stir evenly, the Baume degree of the coating is 70°Bé, then dip coating and drying, wherein the layer thickness of the coating is 0.7mm;

[0035] Put the sand box on the vibrating table, the vibration frequency of the vibrating table is 50Hz, the vibration amplitude is 0.5mm, and the vibration time is 60s, then fill the bottom sand into the sand box and vibrate and scrape it, and then dry it The completed pattern is placed on the bottom sand, and filled with mold dry sand with a particle size of 35 meshes. After the mold dry sand is vibrated, the molten metal is poured. The vacuum negative pressure during pouring is controlled at 0.045MPa, and the temperature during p...

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Abstract

The invention discloses a hub casting method and relates to the technical field of hub casting methods. The hub casting method comprises the following steps that a mold sample is manufactured and comprises 65-75% of EPMMA and 25-35% of EPS, and after the mold sample is manufactured, combination and drying are conducted; and coating is prepared and stirred evenly, and dip-coating of the coating anddrying are conducted. The matching ratio of the mold sample is set to be 65-75% of EPMMA and 25-35% of EPS, and can reduce formation of wrinkled skin and carbon black of nodular iron castings; by setting the density of the mold sample to be within 18-21 kg / m3, the problem of the carbon black of the castings is prevented advantageously; and by controlling the baume degree of the coating to be within 65-75 degrees and controlling the layer thickness of the coating to be within 0.6-0.8 mm, the compactness, intensity and refractoriness of the coating layer are improved advantageously, and the carbon defects and burnt-on sand problem of the castings can be prevented at the same time.

Description

technical field [0001] The invention belongs to the technical field of wheel hub casting methods, in particular to a wheel hub casting method based on lost foam casting technology. Background technique [0002] In order to improve the situation of sand casting, people have made a lot of efforts. The application of high-speed clay wet sand injection molding and static pressure molding in modern times, the application of furan resin self-setting sand, organic ester hardening and microwave heating water glass sand have achieved the goal of sand casting. advanced level. However, how to realize the production requirements of "high efficiency, high quality, clean, low cost and high precision" for those large and medium-sized castings with small batches, complex shapes, and complex castings produced in large quantities has become an urgent problem for foundry workers. major issues. After the appearance of the lost foam casting method, this problem has been solved. Lost foam cast...

Claims

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Application Information

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IPC IPC(8): B22C9/28B22C9/04B22C7/02B22C3/00
CPCB22C3/00B22C7/02B22C9/046B22C9/28
Inventor 孙成涛吴友坤程兆虎
Owner ANHUI HELI CO LTD
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