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

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