Molding sand for casting elevator traction sheave and its special molding device

Abstract

The invention relates to a molding sand for casting elevator traction wheels and a molding device thereof. The molding sand includes a three-layer structure, which is divided into a fine sand layer, a medium sand layer and a coarse sand layer. The fine sand layer is the innermost layer. The middle sand layer is the outer layer of the fine sand layer, the coarse sand layer is the outer layer of the middle sand layer, the fine sand layer is a sand layer made of sand with a fineness modulus less than 2.2, and the middle sand layer is composed of A sand layer composed of sand with a fineness modulus between 2.3 and 3.0, the coarse sand is a sand layer composed of sand with a fineness modulus between 3.1 and 3.7, and the thickness of the fine sand layer is 30 to 50mm between. On the premise of ensuring the surface quality of the casting, the molding sand greatly reduces the manufacturing cost of the molding sand, and at the same time, the stability of the molding sand after molding is improved, and it is not easy to be damaged and deformed.

Description

technical field [0001] The invention relates to an article used for casting elevator traction wheels, in particular to molding sand for casting elevator traction wheels. Background technique [0002] In the foundry field, sand casting is a common molding method for producing castings. Because the molding materials used in sand casting are cheap and easy to obtain, the mold manufacturing is simple, and it can be adapted to single-piece production, batch production and mass production of castings. , has been the basic process in casting production for a long time. The most important step in sand casting is to use a sandbox to shape the sand. [0003] The elevator traction sheave is the sheave on the traction machine, also known as the traction sheave or the driving sheave. It is a device for the elevator to transmit traction power. It uses the friction force between the traction wire rope and the rope groove on the traction wheel rim to transmit power, and is installed on th...

AI Technical Summary

Problems solved by technology

This molding method requires the production of molding sand, which requires workers to use sand and cores to form. The molding efficiency is low, which reduces the production efficiency of the enterprise. Moreover, after the molding sand is formed, it is very inconvenient to take out the core, which is a waste of time. A little carelessness may damage the molding sand, and it needs to be remade, wasting time

The sand used in the existing molding sand is either all fine sand or all coarse sand. Fine sand is beneficial to the surface quality of castings, but fine sand has high cost and is not easy to shape; while coarse sand is low in cost, it is not conducive to the quality of castings. Surface quality; therefore, it is necessary to develop a low-cost molding sand that can guarantee the surface quality of castings

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