3D printing production method for automobile engine cylinder block

Abstract

The invention belongs to the manufacturing field of car engine cylinder body castings and particularly relates to a car engine cylinder body 3D printing production method. The method comprises the following steps that 1, a casting system is designed, wherein according to the design principle of the casting system, and a middle casting open type casting system is adopted; 2, a sand core is designed, wherein at first, a complete casting mold is drawn in three-dimensional software, and then core separating is carried out in three directions of a cylinder opening face, the top position of a water jacket and a flange face; 3, a core assembly modeling method is adopted, wherein separated cores are sequentially discharged, whole core assembling is carried out, and then casting is carried out. According to the method, by the adoption of the 3D printing technology, a set of core assembly modeling technologies applicable to such castings are designed, therefore, the casting rejection rate of the cylinder body castings and the difficulty of core assembly modeling are reduced, the purpose of producing high-quality and low-rejection-rate castings is achieved, the process control is simplified, the research and development cost of new products is reduced, and the trial-produce progress is accelerated.

Description

technical field [0001] The invention belongs to the field of manufacturing automotive engine cylinder block castings, and in particular relates to a 3D printing production method for an automotive engine cylinder block. Background technique [0002] In industrial production, the automobile engine block is the heart of the automobile engine and is generally made of gray cast iron. The cylindrical cavity in the upper part of the common cylinder block is called the cylinder, and the lower part is the crankcase supporting the crankshaft. Its inner cavity is the space for the crankshaft to move. Among them, many reinforcing ribs, cooling water jacket and lubricating oil are cast inside the cylinder. Road, etc., so the structure of the cylinder is complex, the product size requirements are high, the wall thickness is within the range of 5-7mm, and the sand core of the water jacket of the cylinder is only 4mm wide, which makes casting difficult. [0003] At present, this type of c...

AI Technical Summary

Problems solved by technology

However, the following problems also exist in the traditional process: such a core making and molding process produces a large number of sand cores, the core assembly method is complicated, the process control requirements are cumbersome, and the skill level of the on-site workers is high; at the same time, due to the It is difficult to control the size of medium products, resulting in large size errors

Therefore, in the prior art, due to the influence of these factors, castings are often scrapped due to reasons such as unqualified dimensions, and the scrap rate is as high as 30%. At the same time, if this process is used in the trial production of new products, it will cost about More than 50,000 yuan, the cost of product trial production is very high, and the production verification cycle is as long as 4-5 weeks, which is not conducive to the development of new products

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