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A valve body lost foam and its manufacturing method

A manufacturing method and technology of lost foam, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of labor consumption, unfavorable filling, waste of materials, etc., to save materials and labor, reduce post-processing costs, and delay solidification the effect of time

Active Publication Date: 2017-03-08
埃维柯精密铸造(安徽)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a valve body lost foam and its manufacturing method to solve the above-mentioned method of adding a large riser to the top of the upper flange flange to avoid shrinkage caused by the prior art. Low process yield , and the workload in the later stage is also large and the cost is high. The conventional lost foam casting process adds a large riser at the bolt table, which greatly reduces the process yield of the casting, wastes a lot of materials and consumes more Artificial, when placed horizontally, it is not conducive to filling, and the filling effect is poor

Method used

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  • A valve body lost foam and its manufacturing method
  • A valve body lost foam and its manufacturing method
  • A valve body lost foam and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for manufacturing lost foam of a valve body, the specific steps include:

[0036] (1) Design the model with 3D software according to the drawing of the valve body, and use CAE analysis software to analyze, determine the appropriate model, and manufacture the corresponding mold;

[0037] (2) Pre-expandable polymethyl methacrylate resin beads;

[0038] (3) Use expandable polymethyl methacrylate resin beads to make a white mold of the valve body and dry it.

[0039] (4) In the square cavity of the white mold after molding, use expandable polymethyl methacrylate resin beads to make sprue 2, runner 3, vertical sprue 4, and inner gate 5. The runner 31, the second runner 32, and the third runner 33 are glued in parallel between the first runner 41 and the second runner 42, and the distance between each runner 3 is equal , The connection between each runner 3 and the down runner 4 is bonded to the inner gate 5, and the valve body is placed upside down above the inner gate 5, ...

Embodiment 2

[0050] A method for manufacturing lost foam of a valve body, the specific steps include:

[0051] (1) Design the model with 3D software according to the drawing of the valve body, and use CAE analysis software to analyze, determine the appropriate model, and manufacture the corresponding mold;

[0052] (2) Pre-expandable polymethyl methacrylate resin beads;

[0053] (3) Use expandable polymethyl methacrylate resin beads to make the white mold of the valve body, and put the white mold into the drying room, and adjust the temperature to 50-55°C for drying.

[0054] (4) In the square cavity of the white mold after molding, use expandable polymethyl methacrylate resin beads to make sprue 2, runner 3, vertical sprue 4, and inner gate 5. The runner 31, the second runner 32, and the third runner 33 are glued in parallel between the first runner 41 and the second runner 42, and the distance between each runner 3 is equal , The connection between each runner 3 and the down runner 4 is bonded ...

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Abstract

The invention discloses a valve body lost mould and a using method thereof. The valve body lost mould comprises a lost mould, a sprue cup and an ingate, wherein the lost mould comprises a sealing surface and a valve seat; the ingate is divided into a straight pouring gate, a transverse pouring gate, a vertical pouring gate and a flow gate; the flow gate is arranged on a joint of the transverse pouring gate and the vertical pouring gate; the sprue cup is connected with the straight pouring gate; the straight pouring gate is connected with a second transverse pouring gate; a sealing surface is arranged on the upper part of the flow gate; and the valve body is parallel to the transverse pouring gate. The using method of the valve body lost mould comprises eleven operation steps. A method for inversely casting a valve body is adopted, and the sealing surface in the valve body is connected with the ingate, so that pouring liquor coagulation time of a sealing surface part can be delayed, the precision of the sealing surface is improved, the principle that the important surface faces downwards in foundry practice is satisfied, the yield can be increased by 7-10%, and the after-treatment cost can be reduced by 10-30%; and meanwhile, the bottom is free of a quality problem, and materials and labor power can be saved.

Description

Technical field [0001] The invention relates to the field of casting of valve body lost foam, in particular to a valve body lost foam and a manufacturing method thereof. Background technique [0002] Because there are several bolt packs at the waist flange of the valve body casting, traditional sand core casting and conventional lost foam casting have partial shrinkage defects, and this defect can only be found after processing, which causes waste of processing costs. It will also cause delays in delivery when batches of waste products occur. Even if the riser is added, it cannot be completely guaranteed to be defect-free. [0003] Traditional sand core casting uses horizontal parting casting and adds a large riser on the top of the upper flange to avoid shrinkage. However, this method has a low process yield, and the later workload is large and the cost is high. Conventional lost foam In the casting process, the traditional big mouth upwards is convenient for the compaction of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/22B22C9/04B22C9/08
Inventor 刘祥李玉明
Owner 埃维柯精密铸造(安徽)有限公司
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