A kind of preparation method of balance shaft bracket casting

A balance shaft bracket and casting technology, which is applied in the field of preparation of balance shaft bracket castings, can solve the problems of shrinkage cavity, difficult machining, low heat conduction and heat storage capacity, etc., prevent the formation of oxidation pinholes, and improve the utilization rate of molten iron , The effect of strong heat conduction and heat storage capacity

Active Publication Date: 2021-12-21
HUBEI XINGYUAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product structure is basically similar, but the structure is more complex, the wall thickness is uneven, and there are many hot spots, so it is difficult to cast, especially the position of the installation hole on the bottom surface is prone to shrinkage porosity and shrinkage cavity defects, which leads to the scrapping of castings during processing, and the scrap rate is as high as 30% %
This also brings difficulties to machining. Internal shrinkage and shrinkage often break the drill bit, and the hole position is out of tolerance.
[0003] The existing casting method of balance shaft bracket castings is: adding feeding riser and using cast iron chill, but cast iron chill has high density, low heat conduction and heat storage capacity, large thermal expansion, easy to cause local deformation of castings, brushing The cold iron near the gate of castings with poor performance and concentrated heat capacity is easily melted and bonded to the casting, which cannot guarantee the inherent quality of the balance shaft bracket casting

Method used

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  • A kind of preparation method of balance shaft bracket casting

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preparation example Construction

[0039] The invention provides a method for preparing a balance shaft bracket casting, comprising the following steps:

[0040] (1) Arrangement of the gating system: a one-to-one structure is adopted, and an ingate is provided at the end face of the shaft hole of the balance shaft connection part of the balance shaft support model, the ingate is connected with the sprue, and the ingate is connected with the sprue. A sprue cup is arranged on the top of the runner, a graphite cold iron installation position is arranged in the middle of the upper frame connection part of the balance shaft support model, and slag discharge risers are respectively arranged at both ends of the upper frame connection part;

[0041] Brush paint on the surface of the balance shaft bracket model to obtain a yellow mold;

[0042] The coating of the prone to defect position of the yellow mold is peeled off to obtain the position to be treated, after the hot melt adhesive is applied to the surface of the gr...

Embodiment 1

[0078] (1) The layout of the pouring system: a one-piece structure is adopted, and an ingate is provided at the end face of the shaft hole of the balance shaft connection part of the balance shaft support model. The ingate of the balance shaft support model is connected with a direct pouring There is a sprue cup on the top of the sprue; a cold iron installation position is set in the middle of the frame connection part on each balance shaft support model, and slag discharge risers are respectively set at both ends.

[0079] 1) White mold bonding: the specific operation steps are as follows

[0080] The white mold is polished to obtain the polished white mold, and the sandpaper used for grinding is 800#, and the grinding can make flashes, burrs and bumps on the white mold be polished off.

[0081] Apply WPH cold glue on the parts to be bonded of the polished white mold (use a brush to brush several times until the thickness is uniform and no accumulation phenomenon), and then c...

Embodiment 2

[0099] (1) The layout of the pouring system: a one-piece structure is adopted, and an ingate is provided at the end face of the shaft hole of the balance shaft connection part of the balance shaft support model. The ingate of the balance shaft support model is connected with a direct pouring There is a sprue cup on the top of the sprue; a cold iron installation position is set in the middle of the frame connection part on each balance shaft support model, and slag discharge risers are respectively set at both ends.

[0100] 1) White mold bonding: the specific operation steps are as follows

[0101] The white mold is polished to obtain the polished white mold, and the sandpaper used for grinding is 600#, and the grinding can make flashes, burrs and bumps on the white mold be polished off.

[0102] Apply WPH cold glue on the parts to be bonded of the polished white mold (use a brush to brush several times until the thickness is uniform and no accumulation phenomenon), and then c...

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Abstract

The invention provides a preparation method of a balance shaft support casting, which belongs to the technical field of balance shaft support castings. The present invention can accelerate the solidification speed of the molten iron at the position of the balance shaft support casting (hot spot) by placing the graphite chill at the position where defects are likely to occur in the casting of the balance shaft support, cancel the feeding riser, and reduce the shrinkage and shrinkage of the casting Significantly reduced, but also increased the utilization rate of molten iron.

Description

technical field [0001] The invention relates to the technical field of balance shaft brackets, in particular to a preparation method of a balance shaft bracket casting. Background technique [0002] There are many types of balance shaft brackets for commercial vehicles, including heavy, medium and light models, all of which are made of ductile iron QT500-7. The product structure is basically similar, but the structure is more complex, the wall thickness is uneven, and there are many hot spots, so it is difficult to cast, especially the position of the installation hole on the bottom surface is prone to shrinkage porosity and shrinkage cavity defects, which leads to the scrapping of castings during processing, and the scrap rate is as high as 30% %. This also brings difficulties to machining. Internal shrinkage and shrinkage often break the drill bit and the hole position is out of tolerance. [0003] The existing casting method of balance shaft bracket castings is: adding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C7/02B22C9/08B22C9/22
CPCB22C9/04B22C7/02B22C9/082B22C9/22
Inventor 罗铖冀元贵孙成良
Owner HUBEI XINGYUAN SCI & TECH
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