CN-122007250-A - Method for manufacturing square cylinder and device for manufacturing cylinder

Abstract

The invention provides a method for manufacturing a square cylinder, which can inhibit deformation of two ends of the square cylinder in the cylinder axis direction, improve the shape precision of a quadrangle in a section perpendicular to the cylinder axis, and prevent the breakage of materials. A method for manufacturing a square cylinder having a 1 st side surface portion and a2 nd side surface portion which face each other, the method comprising the steps of disposing a plate-like plate inside a cylinder to be formed, inserting the cylinder including the plate inside into a groove of a support side mold to deform the cylinder to form the 1 st side surface portion, producing a cylindrical intermediate body, disposing the plate-like plate inside the intermediate body and a movable plate which is movable relative to the plate-like plate, and inserting the intermediate body including the plate inside and the movable plate into the groove of the support side mold to deform the intermediate body to form the 2 nd side surface portion, wherein in the step of forming the 2 nd side surface portion, the movable plate is pressed in a direction opposite to a direction in which the plate is inserted into the groove.

Inventors

• FUJISAKI SADAO

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20251106

Priority Date

20241111

Claims (4)

1. 1. A method for manufacturing a square tube having a1 st side surface portion and a2 nd side surface portion which face each other, the method comprising: A plate-like plate is disposed inside a cylindrical body to be formed; inserting the cylindrical body including the plate inside into a groove of a support side mold to deform the cylindrical body to form the 1 st side surface portion, and manufacturing a cylindrical intermediate; a plate-like plate and a movable plate which can move relative to the plate-like plate are arranged on the inner side of the intermediate body, and The intermediate body including the plate and the movable plate on the inner side is inserted into the groove of the support side mold to deform the intermediate body to form the 2 nd side surface portion, In the step of forming the 2 nd side surface portion, the movable plate is pressed in a direction opposite to a direction in which the plate is inserted into the groove.
2. 2. The method of manufacturing a square tube according to claim 1, wherein, In the support side mold, an opening portion of the insertion side of the groove is wide, and an inclined surface is provided so as to narrow toward the bottom of the groove.
3. 3. An apparatus for manufacturing a cylindrical body, comprising: a plate disposed inside the cylinder as a molding target, a movable plate movable relative to the plate, and And a support side mold having a groove into which the cylinder body in which the plate and the movable plate are disposed is inserted.
4. 4. The apparatus for manufacturing a cylinder according to claim 3, In the support side mold, an opening portion of the insertion side of the groove is wide, and an inclined surface is provided so as to narrow toward the bottom of the groove.

Description

Method for manufacturing square cylinder and device for manufacturing cylinder Technical Field The present invention relates to a method for manufacturing a square tube and an apparatus for manufacturing a tube. Background Patent document 1 discloses that a cylindrical case member is formed into a square cylindrical shape conforming to the outer shape of a battery cell by using a mold and a molding member. Patent document 1 Japanese patent laid-open No. 2006-059804 Disclosure of Invention Patent document 1 discloses 2 molding methods, i.e., a molding method based on fig. 7A and 7B and a molding method based on fig. 8A and 8B. In the molding described in the example of fig. 7A and 7B of reference 1, since the molding member 35 is inserted into the cylindrical case member 25 as shown in fig. 7A, when the molding member is square as shown in fig. 7B, a gap is generated between the molding member 35 and the side surface portion (portion forming the short side of the rectangular square tube) of the case member 25 (the exterior case 8) as shown in fig. 7B, and it is difficult to mold the shape of the side surface portion with high accuracy. In the molding described in the example of fig. 8A and 8B of reference 1, since the tensile force is applied in the direction orthogonal to the cylinder axis of the cylinder of the case member 25, the end portion of the flat portion (the portion forming the long side of the rectangular square cylinder) is deformed by the tensile force as shown in fig. 9. Therefore, it is necessary to remove it by cutting and form it into a linear shape. In this example, the side surface portion is semicircular and has a substantially elliptical cross section, but if the side surface portion is also intended to be a rectangular square tube formed by forming a straight line, R remains in the corner portion, and the shape of the corner portion tends to be insufficient. If the stretching force is increased to sufficiently form the shape of the angled portion, the material may be broken. Accordingly, an object of the present invention is to provide a method for manufacturing a square tube, which suppresses deformation of both ends of the square tube in the tube axis direction, improves shape accuracy of a quadrangle even in a cross section in a direction orthogonal to the tube axis, and is less likely to cause breakage of a material. A method for manufacturing a square cylinder having a1 st side surface portion and a2 nd side surface portion which face each other, the method comprising the steps of disposing a plate-like plate inside a cylinder body to be formed, inserting the cylinder body including the plate inside into a groove of a support side mold to deform the cylinder body to form the 1 st side surface portion, producing a cylindrical intermediate body, disposing the plate-like plate inside the intermediate body and a movable plate relatively movable with respect to the plate-like plate, and inserting the intermediate body including the plate inside and the movable plate into the groove of the support side mold to deform the intermediate body to form the 2 nd side surface portion, wherein the movable plate is pressed in a direction opposite to a direction in which the plate is inserted into the groove in the step of forming the 2 nd side surface portion. A device for manufacturing a cylinder body is provided with a plate disposed on the inner side of a cylinder body to be molded, a movable plate that is movable relative to the plate, and a support side mold that has a groove into which the cylinder body with the plate and the movable plate disposed on the inner side is inserted. In the above-described manufacturing method and manufacturing apparatus, the support side mold may have a wide opening on the insertion side of the groove, and may be provided with an inclined surface that narrows toward the bottom of the groove. Effects of the invention According to the present invention, since the square tube is formed by press working, deformation as shown in fig. 9 is less likely to occur, and the necessity of cutting a bent portion to form a straight line shape can be reduced. Further, the 1 st side surface portion and the 2 nd side surface portion are formed by being sandwiched between the plate and the mold, so that the shape accuracy can be improved. The risk of material breakage during the forming can also be reduced. Drawings Fig. 1 is a diagram illustrating the mode of the cylinder 11 before molding and the cylinder 12 after molding, which are objects to be molded. Fig. 2 is a view illustrating the 1 st side forming plate 21. Fig. 3 is a view illustrating the side surface portion forming apparatus 22 of fig. 2. Fig. 4 is a diagram illustrating the support side mold 40. Fig. 5 is a view illustrating the step of inserting the 1 st side forming plate. Fig. 6 (a) and 6 (b) are diagrams illustrating the 1 st side surface portion forming step. Fig. 7 is a diagram illustrating the step of settin