JPH0446649A - How to manufacture flange parts - Google Patents

Abstract

PURPOSE:To manufacture a flange part free from generation of wrong transport, scale, underfill, etc., in this invention by forging a work piece blanked from a plate material into a flange part. CONSTITUTION:A small hole 2 making a central hole 4a is punched nearly in the center of a uniform thickness blank 1, then, an outer diameter is blanked with this small hole 2 in the center to obtain a disk like work 3. As this work 3 is heated, the surface is coated with graphite to perform oxidation preventing treatment, then, this work is heated to 650-900 deg.C, then, this is entered into a press and forged. Variation is not generated in thickness and scales are not generated on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a flange part in which the flange part is forged from a workpiece punched from a plate material.

[Conventional technology]

Many of the flange parts conventionally used for mechanical parts, piping materials, etc. are manufactured by forging.

In addition, when manufacturing flange parts, conventionally a round bar-shaped material a as shown in Fig. 4(a) is hot forged and the material shown in Fig. 4(a) is
Generally, a method is adopted in which a disc-shaped workpiece b as shown in b) is manufactured, and then this workpiece is upset forged to produce a flange part C as shown in Fig. 4(c). .

[Problem to be solved by the invention]

However, workpieces that are hot-forged from round bar-shaped materials tend to have variations in wall thickness, so if they are transported to a press using a transfer feeder, transport errors may occur.

In addition, when forging workpieces with uneven wall thickness into flange parts, parts with thin walls will have insufficient thickness, while parts with thick walls will cause defects such as cracks. During hot forging, scale is generated on the surface of the workpiece, which has to be removed by machining, which requires a lot of man-hours.

This invention has been made to improve the above-mentioned problems, and aims to provide a method for manufacturing flange parts that does not cause transport errors, scale, underfilling, etc.

[Means and effects for solving the problem] In order to achieve the above object, the present invention manufactures a disc-shaped workpiece by punching and forming a plate-shaped material with a uniform thickness, and then oxidizes it. After being subjected to preventive treatment, it is heated to 650 to 900°C and transported to a press, where it is forged.

As a result, the workpiece punched from the plate-shaped material has a uniform wall thickness, so there is no possibility of mistakes when carrying it in. At the same time, by lowering the forging temperature and performing oxidation prevention treatment, it is possible to prevent scale from forming on the surface. There is no need for machining.

Furthermore, even when the workpiece is heated and closed forged using a press, the thickness of the workpiece is uniform, so there is no possibility of partial underfilling or cracks.

〔Example〕

An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 3.

In the figure, 1 is a plate-shaped material with uniform wall thickness. First, a small hole 2 is punched out approximately in the center of this material 1, and then the outer diameter is punched out around this small hole 2. Plate-shaped work 3
get.

Then, this workpiece 3 is heated to 100 to 200°C and the surface is coated with graphite to prevent oxidation, then this workpiece is heated to 650 to 900°C, and then it is carried into a press and forged. This is what we do.

The flange part 4 obtained by the above manufacturing process is shown in FIG.

〔Effect of the invention〕

As described in detail above, this invention produces a disk-shaped workpiece by punching a plate-shaped material, and thus obtains a plate-shaped workpiece by hot forging a conventional round bar-shaped material. There is no variation in wall thickness or scale formation on the surface, as would be the case.

In addition, because the workpieces with uniform wall thickness are carried into the press for forging, there is no possibility of mistakes in carrying them in, and there is also no possibility of partial missing parts or burrs, which reduces the incidence of defective products. It will also be possible to achieve a significant reduction in

Furthermore, by lowering the forging temperature and applying anti-oxidation treatment to the surface, scale will not form on the surface of the workpiece, making machining of the workpiece unnecessary and reducing the number of man-hours required for machining. It becomes like this.

[Brief explanation of the drawing]

1 to 3 are process diagrams showing one embodiment of the method of the present invention, and FIGS. 4(a), (b), and (c) are process diagrams showing a conventional manufacturing method. 1 is the material, 3 is the work. Figure 1 Figure 2

Claims (1)

[Claims] A disk-shaped workpiece 3 is manufactured by punching and forming a plate-shaped material 1 with a uniform thickness, and then after being subjected to oxidation prevention treatment, 65
A method for producing a flange part, which comprises heating the product to 0 to 900°C, transporting it to a press, and forging it into a flange part using the press.