TWI496632B - Fabricting method for metallic member - Google Patents

Description

Metal parts manufacturing method

The present invention relates to a method of manufacturing a metal part, and more particularly to a method of manufacturing a metal part including a forging step.

Conventional metal parts manufacturing methods generally include steps such as forging, milling, and sand blasting. The forging die used in the forging step is generally composed of an upper die and a lower die, and a cavity is opened on the lower die. When forging, the lower mold is first positioned to position the metal blank in the cavity of the lower mold. Thereafter, the metal blank is extrusion-deformed by the downward mold movement of the upper mold, so that the metal blank is filled in the cavity to obtain a desired shape. However, since the upper mold and the lower mold are closed to form a close-closed cavity, the closed cavity often causes insufficient flow of the metal blank during the forging process, thereby causing the gold inside the metal after forging molding. The organization is uneven. The metal member formed by the forging method may have a different color on the outer surface thereof in the subsequent sandblasting process.

In view of the above, it is necessary to provide a metal member manufacturing method in which the internal metallographic structure is uniform and the surface after the blasting treatment has no discoloration.

A metal piece manufacturing method comprising the steps of: providing a pre-forging die comprising an upper die and a lower die, wherein the lower die is provided with a pre-forging cavity and a cavity is opened in the pre-forging cavity; and the metal blank is positioned And in the cavity, partially received in the pre-forging cavity, the upper die moves toward the lower die to forge the metal blank, so that the metal blank flows to the side And a part of the metal blank flows into the cavity to obtain a preform, the preform includes a base body and a forging portion formed in the cavity; and the preform is annealed to eliminate the occurrence of the pre-forging process a metal flow line; providing a forging die comprising a movable mold and a fixed mold, wherein the fixed mold is provided with a cavity, and the forging portion of the preform is completely accommodated in the cavity, and the movable mold moves toward the fixed mold To change the thickness of the substrate to obtain a forged body; the forging body is milled to meet a predetermined size requirement; and the forged body is sandblasted to obtain a metal piece.

Since the metal blank can generate local free flow during the pre-forging process, the metallographic structure of the metal piece is uniform, and the surface of the metal piece produced is uniform in color and has no discoloration.

100‧‧‧Pre-forging mould

201‧‧‧Preform

202‧‧‧ base

203‧‧‧Forging Department

10‧‧‧上模

20‧‧‧Down

21‧‧‧Pre-forging chamber

211‧‧‧ bottom

213‧‧‧ side

23‧‧‧ cavity

204‧‧‧Metal streamline

205‧‧‧Forging body

220‧‧‧Forgings

300‧‧‧Forging die

310‧‧‧moving

330‧‧ ‧ fixed mode

331‧‧‧ cavity

1 is a schematic flow chart of a method for manufacturing a metal member according to an embodiment of the present invention.

2 is a schematic cross-sectional view of a mold after forging a metal part according to an embodiment of the present invention.

3 is a schematic cross-sectional view of a die after forging a metal part according to an embodiment of the present invention.

Fig. 4 is a metallographic view of a metal member produced by the method for producing a metal member of the present invention.

Referring to FIG. 1 to FIG. 3, a metal part manufacturing method according to an embodiment of the present invention includes the following steps:

Step S101: Providing a pre-forging die 100 comprising an upper die 10 and a lower die 20, the lower die 20 is provided with a pre-forging cavity 21 and a cavity 23 is opened in the pre-forging cavity 21. The upper mold 10 is in the form of a block, and the pre-forging chamber 21 includes a bottom surface 211 and a side surface 213. The cavity 23 is formed on the bottom surface 211, and its lateral dimension gradually decreases downward along the bottom surface 211 of the pre-forging chamber 21.

Step S102: positioning the metal blank on the cavity 23 and partially housing the pre-forging cavity 21 The upper mold 10 is moved to the lower mold 20 to forge the metal blank, so that the metal blank flows to the side, and part of the metal blank flows into the cavity 23 to prepare the preform 201. The preform 201 includes the base 202 and is formed on the base 202. The forging portion 203 in the cavity 23. In the pre-forging, the metal blank is placed in the pre-forging chamber 21 of the lower mold 20 and located on the cavity 23, and the side walls thereof are partially blocked by the side surface 213 of the pre-forging chamber 21. The upper mold 10 presses the metal blank to the lower mold 20, and the metal blank is locally freely extended toward the side. Due to the blocking action of the side wall of the pre-forging chamber 21, part of the material of the metal blank flows into the cavity 23 and fills the cavity 23, so that the forging portion 203 is formed in the cavity 23. The metal blank is correspondingly formed between the pre-forging chamber 21 and the upper mold 10 to form the base 202. During the pre-forging process, the coarse dendrites, pores, looseness and various inclusions in the metal blank are elongated along the deformation direction and the side of the metal blank, thereby becoming strips, lines, chains or flakes. A metal flow line 204 is formed in the blank. In the present embodiment, the forging portion 203 is a projection in the cavity 23, and the metal blank is an aluminum alloy material.

Step S103: The preform 201 is annealed to eliminate the metal flow lines 204 generated during the pre-forging process.

Step S104: The preform 201 is forged by a forging die 300 to change the thickness of the substrate 202 to obtain a forged body 205. The forging die 300 includes a movable die 310 and a stationary die 330. A cavity 331 is formed on the stationary mold 330, and the cavity 331 has the same shape and size as the cavity 23 of the pre-forging die 100. At the time of forging, the forging portion 203 of the preform 201 is housed in the cavity 331. The preform 201 is pressed against the stationary mold 330 by the movable mold 310, and the thickness of the base 202 of the preform 201 is thinned, thereby producing a forged body 205.

Step S105: Milling the forging body 205 to meet the preset size requirement. In the present embodiment, the forging body 205 is subjected to milling processing using CNC (Computer Numerical Control).

Step S106: The forging body 205 is sandblasted to obtain a metal piece.

Please refer to FIG. 4, which is a metallographic diagram of a metal piece. Since the metal blank can be locally freely flowing during the pre-forging process, the metallographic structure of the metal member is uniform, and the color of the appearance surface of the metal member after the blasting treatment is uniform and uniform, and no color difference. And the hardness of the metal parts is relatively balanced.

It can be understood that the pre-forging chamber 21 on the lower mold 20 is also surrounded by the retaining portion of the detachable structure, and the metal blank can also be made of stainless steel.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

Claims (6)

A metal piece manufacturing method comprising the steps of: providing a pre-forging die comprising an upper die and a lower die, wherein the lower die is provided with a pre-forging cavity and a cavity is opened in the pre-forging cavity; and the metal blank is positioned And the partial cavity is partially received in the pre-forging cavity, the upper die moves toward the lower die to forge the metal blank, so that the metal blank flows to the side, and a part of the metal blank flows into the cavity to prepare a pre-preparation a preform comprising a base body and a forging portion formed in the cavity; annealing the preform to eliminate metal flow lines generated during the pre-forging process; and providing a forging die including a movable mold And the fixed mold, the fixed mold is provided with a cavity, the forging portion of the preform is completely accommodated in the cavity, and the movable mold is moved toward the fixed mold to change the thickness of the base body, thereby preparing a forging body; The forging body is milled to meet a predetermined size requirement; and the forging body is sandblasted to obtain a metal piece. The method of manufacturing a metal part according to claim 1, wherein the pre-forging chamber is surrounded by a detachable material portion. The method of manufacturing a metal part according to claim 1, wherein the pre-forging chamber comprises a bottom surface and a side surface, the cavity is formed on the bottom surface, and a lateral dimension thereof is gradually decreased along a bottom surface of the pre-forging chamber. . The method for manufacturing a metal part according to claim 3, wherein in the pre-forging process, the metal blank is first placed in the pre-forging chamber, and the side wall of the metal blank is partially blocked by the side of the pre-forging chamber; Pressing the metal blank to the lower mold by using the upper mold, so that the metal blank is freely extended to the side portion and filling the cavity to form the base body and the forging portion, and the base body is in the upper mold Between the cavities. The method of manufacturing a metal part according to claim 1, wherein the metal blank is made of an aluminum alloy or a stainless steel material. The method of manufacturing a metal part according to claim 1, wherein the cavity of the fixed mold has the same shape and shape of the cavity of the lower mold, and the thickness of the base is thinned during the forging process.