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Process method for forming grooves in gravity casting mold cavity surface

A technology of gravity casting and process method, applied in casting molding equipment, mold, mold composition, etc., can solve problems such as poor exhaust, stress concentration, cracking, etc., to reduce stress concentration, eliminate surface cracks, and improve economy. effect of benefit

Inactive Publication Date: 2015-09-09
GUANGDONG HONGTEO ACCURATE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a process method for setting process grooves on the cavity surface of a gravity casting mold, and to solve shrinkage cavities caused by thermal knots during product manufacturing with a simple process method. Casting defects such as porosity caused by poor exhaust and cracks caused by stress concentration

Method used

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  • Process method for forming grooves in gravity casting mold cavity surface
  • Process method for forming grooves in gravity casting mold cavity surface
  • Process method for forming grooves in gravity casting mold cavity surface

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: The present invention is used to solve the shrinkage cavity defects caused by hot spots in the product casting process

[0020] According to the size of the hot spot, a plurality of process grooves 3 are set at the position of the cavity surface 2 of the mold 1 corresponding to the shrinkage cavity in the casting. After the pouring is completed, a plurality of semicircular cross-sections will be formed on the corresponding position of the casting surface. Shaped slender and small ribs 5. If the hot spot is small, it is enough to set up 1 to 2 process grooves 3, and setting up the process grooves 3 will not affect the work of the mold 1 and the use of the casting 4. The section of the process groove 3 is semicircular, the diameter D is 4-5mm, the distance S of the process groove is 5-7 times the diameter D, and the length L is generally 5-20 times the diameter. The implementation of the invention eliminates the shrinkage cavity defects in the product casti...

Embodiment 2

[0021] Embodiment 2: The present invention is used in the product casting process to eliminate the pore defect caused by poor exhaust

[0022] In the casting 4, where there is poor ventilation, the cavity surface 2 of the mold 1 has a semicircular and slender process groove 3, which will form a semicircular and slender cross section at the corresponding position on the casting 4 surface Long and small ribs 5. The process groove 3 is set up in the part where there is a bad exhaust. Generally, one is enough. The diameter D of the process groove 3 is 1~2mm. When more than two process grooves 3 are opened, the distance S is 10 Between ~15 times, the length L ensures that the process groove 3 extends to the parting surface of the mold 1, which is generally between 40 and 50 times the diameter D. The implementation of the present invention increases the clamping gap of the parting surface and eliminates the air hole defect in the casting process of the product.

Embodiment 3

[0023] Embodiment 3: The present invention is used in the product casting process to eliminate crack defects caused by stress concentration

[0024] The cavity surface 2 of the mold 1 corresponding to the cracking part caused by the stress concentration in the casting 4 has a semicircular elongated process groove 3, which will form a semicircular cross section at the corresponding position on the casting surface after the casting is completed. Shaped slender and small ribs 5. The number of process grooves 3 opened is 5 to 10, the diameter D of the process grooves 3 is between 2 and 3 mm, the distance S of the process grooves is between 1 and 3 times the diameter D, and the length L of the process grooves 3 is set as the diameter Between 5 to 10 times of D, the length ensures that the cross-section formed on the surface of the casting 4 is a semicircular slender rib that runs through the stress concentration part, and the small rib 5 does not affect the use of the casting after...

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Abstract

The invention discloses a process method for forming grooves in a gravity casting mold cavity surface. According to the method, a plurality of process grooves which do not influence work of the mold are formed in the gravity casting mold cavity surface corresponding to a defective part of a cast product; a plurality of small, thin and long ribs which cannot influence use of a casting are formed in corresponding positions of the surface of the casting after pouring is finished, and the sections of the ribs are semi-circular; the number, the length and the diameter of the process grooves depend on the size and the category of the defective part of the cast product. The method is low in cost, simple and convenient to use, solves the problem about defects of the cast product, such as shrinkage cavities caused by hot spots, pores caused by poor exhaust, cracking caused by stress concentration and the like in the gravity casting process, the effect is remarkable, the production efficiency of an enterprise is improved, and the economic benefits of the enterprise are effectively increased.

Description

technical field [0001] The invention relates to a gravity casting process, in particular to a process method for setting grooves on the cavity surface of a gravity casting mold. Background technique [0002] Defects such as shrinkage cavities, pores, and cracks of castings are problems often encountered in gravity casting. At present, most engineers often start by changing the gating system and overflow system of castings when solving such problems, which not only consumes a lot of time To adjust and modify the mold, sometimes the desired effect cannot be achieved. At present, the aluminum alloy gravity casting products produced in China are gradually diversified and complicated, especially the aluminum alloy gravity castings for large machinery. The products are large in size, complex in structure and thin in wall thickness, etc., which have high requirements on gravity casting technology and on-site management. Therefore, it is urgent to find a method with simple structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/00
Inventor 莫玄恩丁阳阳张安荣吴广龙赖建宏苏陈德
Owner GUANGDONG HONGTEO ACCURATE TECH
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