Mold for large belt wheel machining and manufacturing method thereof

Abstract

The invention relates to the field of large belt wheel machining, in particular to a mold for large belt wheel machining and a manufacturing method of the mold. In order to solve the problem of incapability of existing a draft angle when a die casting method is adopted to manufacture large belt wheels, the invention provides the mold for large belt wheel machining. The mold comprises a fixed moldcore, a movable mold core and a flow separation cone; a casting cavity groove provided with a tooth groove structure on the side wall is formed in the top of the fixed mold core; the movable mold corecovers the top of the fixed mold core; a casting cavity cover opposite to the casting cavity groove is arranged at the bottom of the movable mold core; a feeding channel communicating with the flow separation cone and the casting cavity cover is formed in the bottom of the movable mold core; the inner surface roughness of the casting cavity groove and the casting cavity cover is within Ra 0.2; and PST penetration layers with hardness of at least 75 HRC are arranged on the surfaces of the fixed mold core and the movable mold core. In the mold for large belt wheel machining, the inner surfacesof the casting cavity groove and the casting cavity cover are high in smoothness, so that the mold opening resistance is greatly reduced, and the problem of incapability of existing the draft angle when the die casting method is adopted to manufacture the large belt wheels is solved.

Description

technical field [0001] The invention relates to the field of processing large pulleys, in particular to a mold for processing large pulleys and a manufacturing method of the mold. Background technique [0002] Large pulleys are also called full-circle gears, which are mostly used in power tools and belong to transmission gears. In order to prevent the belt from running back and forth on the full-circle gear due to uneven force, when the full-circle gear is manufactured, the gear surface of the full-circle gear must not have a slope, nor must there be any casting defects. However, when die-casting is used for casting, the die-casting requires at least a draft angle of more than 0.5°, so it can be seen that the large pulley cannot be produced by die-casting. [0003] In addition, the large pulley is used in a large amount, and its structure and material are not suitable for manufacturing by stamping method or profile drawing method. Contents of the invention [0004] In or...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the draft angle cannot exist when using the die-casting method to manufacture large pulleys, the present invention proposes a mold for processing large pulleys. The mold for processing large pulleys includes a fixed mold core, a movable mold core and a splitter cone. The top of the fixed mold core is provided with a casting cavity, and the side wall of the casting cavity is provided with an alveolar structure; the movable mold core is covered on the top of the fixed mold core, and the bottom of the movable mold core is A casting cavity cover corresponding to the position of the casting cavity is provided, and a feeding channel is provided at the bottom of the movable mold core, and the feeding channel communicates with the splitter cone and the casting cavity cover; the casting cavity and the The roughness of the inner surface of the casting hole cover is within Ra0.2; the surface of the fixed mold core and the movable mold core is provided with a PST permeable layer, and the hardness of the PST permeable layer is at least 75HRC

Such a large pulley processing mold has a high smoothness of the inner surface of the casting cavity and the casting cavity cover, which greatly reduces the mold opening resistance, so that the casting cavity and the casting cavity cover of the large pulley processing mold The draft angle is not set, which solves the problem that the draft angle cannot exist when the casting method is used to manufacture large pulleys

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