Forming cylinder for powder spreading type additive manufacturing equipment and in-cylinder piston body section adjusting method

Abstract

The invention discloses a forming cylinder for powder spreading type additive manufacturing equipment and an in-cylinder piston body section adjusting method. The forming cylinder comprises a cylinder body and a piston body arranged in the cylinder body, and the piston body is composed of a center piston body and at least one peripheral piston body, wherein the peripheral piston bodies sleeve on the center piston body and are distributed in the radial direction of the center piston body, and each peripheral piston body is provided with a first connecting part which is connected with the cylinder body and a second connecting part which is connected with the center piston body; and each peripheral piston body is disconnected with the cylinder body through the corresponding first connecting part and connected with the center piston body through the corresponding second connecting part, and then the variable-section piston body is formed by the peripheral piston bodies and the center piston body. According to the forming cylinder for the powder spreading type additive manufacturing equipment and the in-cylinder piston body section adjusting method, screw connection is adopted by the cylinder body, different piston bodies can do up-and-down telescoping motion along with an electric cylinder, and therefore the forming cylinder has forming spaces with three different sizes. When machining is conducted, the forming spaces with different sizes can be selected for machining parts with the corresponding sizes; and by means of the method, the powder spreading quantity can be greatly reduced, and the powder utilizing rate of the powder spreading type additive manufacturing equipment is increased.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a forming cylinder and a method for adjusting the section of a piston body in the cylinder to improve the powder utilization rate of powder-spreading additive manufacturing equipment. Background technique [0002] The powder-spreading additive manufacturing technology belongs to the category of additive manufacturing technology, and laser selective melting and laser selective sintering are the most typical, which use laser to convert the traditional three-dimensional manufacturing process into a plane manufacturing superposition process. The focused laser spot scans the metal powder layer according to the specified route, continuously sinters or melts the metal powder and forms a plane profile, and then stacks the layers to complete the processing, and finally realizes the manufacture of metal parts with arbitrary complex shapes. [0003] In the prior art, the po...

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Problems solved by technology

[0004] However, there is still a lot of powder spreading waste in the existing equipment. The reason is that almost all equipment uses fixed-size forming cylinders. In order to meet the needs of processing larger-sized parts, the size of the forming cylinders is usually large. When using such When the forming cylinder is used to complete the processing of small-sized parts, the forming cylinder must still be covered with a layer thickness before processing each layer, which will cause a lot of waste of powder. Due to the high price of metal powder, the cost of processing small-sized parts is very high ; and the existing forming cylinders are all designed with circular cylinders, compared with the square cylinder, the available forming area is small. Therefore, in the field of powder-spreading additive manufacturing technology, there is an urgent need for a method and forming method that can improve its powder utilization rate. cylinder device

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