Cold Form Repair Technology for Centrifugal Casting Roll
A centrifugal casting and cold forming technology, which is applied in the field of recycling process of tooling used in centrifugal casting, can solve the problems of increased production cost, high production cost, waste, etc. Effect
Active Publication Date: 2016-05-11
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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Problems solved by technology
After being scrapped, a new cold mold needs to be made. Compared with the static casting cold mold, the centrifugal casting cold mold has higher precision requirements, complicated manufacturing process and expensive production cost.
If the cold type is scrapped and replaced once a crack occurs, it will cause a lot of waste and increase the production cost
Method used
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Embodiment Construction
[0020] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
[0021] The repair process of centrifugal casting roll with cold type 2 includes the following process steps:
[0022] A. Reaming of scrapped cold type 2: use cutting to enlarge the inner diameter of scrapped cold type 2. After expanding the inner hole, ensure that the defective parts on the inner wall of cold type 2 can be completely removed, that is, cracks, cracks, etc. The defects of the cold type 2 normal use are completely eliminated. In order not to affect the subsequent assembly effect, the smoothness of the inner hole of the cold type 2 should be guaranteed, that is, the surface roughness of the inner hole of the cold type 2 after processing is Ra1.6~Ra3.2.
[0023] B. Production of the corresponding inner bushing 1: Select the same or similar material as the cold type 2 to process and produce the inner bushing 1. The inner surface and outer sur...
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The invention discloses a repair technology of a cold mold for centrifugal casting of a roller. The repair technology comprises the following steps: A. broaching a scrapped cold mold: broaching the scrapped cold mold, so as to completely remove materials with defects on the inner wall of the cold mold; B, producing a corresponding inner bushing: producing the inner bushing of which the outer diameter is in interference fit with the inner diameter of the cold mold, and the inner diameter corresponds to the blank size of the outer diameter of the roller; C, assembling: heating the cold mold according to a shrinkage fitting technology, and pressing and mounting the inner bushing into the inner hole of the cold mold when the temperature of the cold mold rises to 400 to 450 DEG C; D, fixing: fixing the circumference surfaces at two ends of the seams of the outer diameter of the inner bushing and the inner diameter of the outer bushing through a plurality of perforation bolts after the assembly is fulfilled and the cold mold and the inner bushing are cooled to be in ordinary temperature. According to the invention, the scrapped cold mold is repaired and improved, so as to prolong the service life of the cold mold, improve the utilization ratio of the cold mold, and greatly reduce the manufacturing cost due to reutilization of the cold mold.
Description
technical field [0001] The invention relates to a technology for reusing tooling used in centrifugal casting, in particular to a repairing technology for cold molds used in centrifugal casting rolls. Background technique [0002] The roll is a casting that not only needs to bear a large load but also needs to be wear-resistant on the surface. At present, the main process for producing rolls is centrifugal casting. When producing centrifugal casting roll blanks, the high-hardness outer metal of the roll is first centrifugally poured into a cold mold, and an end cover box is installed at the front and rear ends of the cold mold, so that the cold mold and the front and rear ends A casting cavity is formed between the cover boxes. When pouring, the casting is first placed on the centrifugal casting machine, and the molten iron is injected into the high-speed rotating cavity, and the molten iron is formed on the inner wall of the cavity by centrifugal action to form a high-hardn...
Claims
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IPC IPC(8): B23P6/00
Inventor 刘建朝
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL