JPS6274610A - Molding of cup-shaped parts with reinforced plane - Google Patents

Abstract

PURPOSE:To bond a reinforcing member of a planar part simultaneously with the molding of a cup part by a method wherein a work member is inserted in the lower punch of a mold after a reinforcing member is fixed to the lower punch and then pressure so as to fix the reinforcing member to the work member and at the same time to form the tubular part. CONSTITUTION:When a punch 1 is lowered in a direction indicated with the arrow after the setting of a reinforcing member 5 in the positioning hole 6 of a knockout pin 3 and the insertion of a work member in a cavity, the work member 4 is pushed out downwards so as to strongly fix to the reinforcing member 5. After that, the upper punch 1 is further pressed in the direction indicated with the arrow so as to flow the work member 4 into the gap between the upper punch 1 and a die 2 in order to form a tubular part. Because the work member is pushed out in the pushing direction so as to form a planar part by fixing the work member to the reinforcing member and, in succession, the work member is pushed out in the direction opposite to the pushing direction in order to form the tubular part as mentioned above, no extra process for bonding the work member to the reinforcing member is necessary to be provided or both the planar reinforced part and the tubular part can be formed by the same plastic working.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of forming a planar reinforced cup-shaped part, and more particularly to a method of forming the cup-shaped part using plastic working.

[Conventional technology]

BACKGROUND ART Cylindrical bodies with one end closed, so-called cup-shaped parts used in mechanical parts, etc., often have their closed N-portion end surfaces (flat surfaces) reinforced depending on the purpose of use.

In this case, the flat part is generally reinforced using a different material that is stronger than the cylindrical part of the cup-shaped part.

When joining dissimilar materials to the flat part of a cup-shaped part, conventionally the cup part and the dissimilar material for flat reinforcement are manufactured separately and then welded together, or by plastic processing, for example, a hole made in the cup part is reinforced. After inserting the member, this part was pressed and compressed (crimped) from the periphery to secure it in place.

[Problem that the invention seeks to solve]

However, when the conventional method is used, a separate process is required to first form the cup part and then connect the cup part to the reinforcing member, which reduces work efficiency and is not economically preferable. Further, each of the conventional bonding techniques may have its own problems, such as poor weldability between the cup portion and the reinforcing member, and cracking during caulking.

Furthermore, even when a planar reinforced cup-shaped part is formed by caulking at the same time as plastic working, the problem that the reinforcing member in the planar portion is likely to crack due to the pressure during processing is likely to occur.

The present invention is intended to solve the above-mentioned problems in the prior art, and its purpose is to bond a reinforcing member to a flat part at the same time as forming a cup part of a cup-shaped part.
It is an object of the present invention to provide a method for forming a planar reinforced cup-shaped part that is simple, quick, economically advantageous, and can produce a high-performance product.

[Means for solving problems]

゛That is, in the method for forming a planar reinforced cup-shaped part of the present invention, after a reinforcing member is fixed to the lower punch of a mold consisting of a die, an upper punch, and a lower punch, the processed member is inserted into the cavity from the open end of the cavity of the die. Then, an upper punch having a gap with the inner circumferential surface of the cavity is inserted into the cavity from the open end to press the workpiece, plastically deforming the workpiece and reinforcing the reinforcing member. After the flat If1 portion is formed by fixing the flat part If1, the workpiece is further pressed with the punch to plastically deform the workpiece and flow into the gap to form the cylindrical part.

As the workpiece, a material that can be easily plastically worked, such as an Al-based alloy, can be used. The reinforcing member may be made of a material harder than the processed member, such as steel or a hard Al-based alloy.
Examples include fiber reinforced metal (FRM). These members may be used alone or in combination. Further, its size and shape may be selected depending on the purpose.

As the die, upper punch, and lower punch, those commonly used for plastic working can be used. The size and shape of the die, upper punch, and lower punch are selected depending on the properties of the intended planar reinforced cup-shaped part.

Plastic working can be performed cold or hot (for example, 400 to 480°C). The temperature and pressure conditions during processing may be determined depending on the properties of the processed member and reinforcing member, the type of molding machine used, etc.

〔Example〕

The method of the present invention will be explained in more detail in comparison with conventional methods in the following examples and comparative examples.

Note that the present invention is not limited to the following examples.

FIG. 1 shows an embodiment of the method of the invention. In the figure, 1 is an upper punch, 2 is a die, 5 is a knockout bottle (lower punch), 4 is a processing member, 5 is a reinforcing member, and 6 is a positioning hole.

First, as shown in FIG. 1A, the reinforcing member 5 is set in the positioning hole 6 of the knockout pin 3, and after the workpiece is inserted into the cavity, the punch 1 is lowered in the direction of the arrow in the figure. In this case, the conditions are rear extrusion paste reduction R, A
, B(r♂/rn”) is the previous extrusion glue reduction R,
Since it is set larger than A and F ('W/'D'), the previous extrusion process is completed first. Here, rp is the outer diameter of the punch 1, rD is the inner diameter of the die 2, and r is the maximum diameter of the reinforcing member 5. That is, as shown in FIG. 1, the processed member 4 is pushed out downward in the figure and is firmly fixed to the reinforcing member 5. Next, the upper punch 1 is further pressed in the direction of the arrow in the figure, and the workpiece 4 is pressed against the upper punch 1 as shown in FIG. 1C.
and the die 2 to form a cylindrical part. FIG. 2 shows a planar reinforced cup-shaped part obtained by the method shown in FIG. FIG. 3 shows another embodiment, in which the entire flat rjiJ portion is strengthened by changing the shape of the reinforcing member 5. In order to prevent the reinforcing member 5 from cracking during extrusion processing, it is preferable that the processing member 4 is heated to a hot region, for example, 400 to 480° C., and the reinforcing member 5 is left in a cold region during extrusion processing.

Comparative Example: FIGS. 4 and 5 show an example of a conventional method for forming a flat reinforced cup-shaped part. FIG. 4 shows an example in which a reinforcing member 5 is welded after forming a cup-shaped part 7 to form a flat part, and FIG. 5 shows an example in which a flat part is formed after forming a cup-shaped part 7.
This is an example in which the reinforcing member 5 is inserted into a hole provided in the hole and the reinforcing member 5 is fixed to the cup-shaped portion 7 by caulking.

The conventional method is complicated due to the large number of work steps, and is also prone to welding defects and cracks during caulking.

(Effects of the Invention) As described above, in the method for forming a planar reinforced cup-shaped part of the present invention, first, the processed member is extruded forward in the suppressing direction to fix the processed member and the reinforcing member to form a flat part, and then Since the cylindrical part is formed by extruding the processed part in the opposite direction to the suppressing direction, there is no need to provide a separate process for joining the processed part and the reinforcing member as in conventional methods, and the same plastic processing is performed. Since the planar reinforcement part and the cylindrical part can be formed by this method, the work efficiency is high and it is economically advantageous.

Furthermore, since the pressure applied when joining the processed member and the reinforcing member is high, the bonding force between the two members is improved.

In addition, since high pressure is applied to the workpiece to plastically deform it, and high compressive pressure is applied from the surroundings to press the reinforcing member to make it adhere to the workpiece, problems such as cracks in plane reinforced parts occur compared to conventional methods. However, this has decreased and product quality has improved.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the method for forming a planar reinforced cup-shaped part according to the present invention, and FIG. 1a is a cross-sectional view showing the state before plastic working. The inner diameter of the die, rv, indicates the maximum diameter of the reinforcing member, Figure 1 is a cross-sectional view showing the forward extrusion state, Figure 1C is a cross-sectional view showing the backward extrusion state, and Figure 2 is a cross-sectional view showing the method of Figure 1. FIG. 3 is a cross-sectional view along the length of the planar reinforced cup-shaped part obtained by the method of the present invention, and FIG. 4 shows an example of a conventional method for forming a planar reinforced cup-shaped part, FIG. 4 d is a sectional view showing the state before the reinforcing member is welded to the cup-shaped part, and FIG. 4 e shows the reinforced part. A cross-sectional view showing the state after the member is welded to the cup-shaped part, Fig. 5 shows another example of the conventional method for forming a planar reinforced cup-shaped part, and Fig. 5 f shows the state after welding the reinforcing member to the cup-shaped part. FIG. 5 is a cross-sectional view showing the state before the reinforcing member is fixed to the cup-shaped part. In the figure, 1... Upper punch 2... Die 3... Knockout 4... Processing member 5... Reinforcement member 6.
...Positioning hole 7...Cup-shaped part Patent applicant Toyota Motor Corporation agent Patent attorney Yumi Kaly (and 1 other person) Figure 1 (a) (b) (C) □ 1- Upper boxer
[2.--Dinner chair
:4・Processed 81I material
j5° reinforcement member
[□ □ A Figure 2 Figure 3 5 '3 Figure 4 5. EZZZZZ = (d) ゛Figure 5 5 (f) (e)

Claims (1)

[Claims] After the reinforcing member is fixed to the lower punch of a mold consisting of a die, an upper punch, and a lower punch, the processed member is inserted into the cavity from the open end of the cavity of the die, and then the workpiece is inserted between the die and the inner peripheral surface of the cavity. An upper punch having a gap is inserted into the cavity from the open end to press the workpiece, and after plastically deforming the workpiece and fixing it to the reinforcing member to form a flat part, the punch is further inserted into the cavity. A method for forming a planar reinforced cup-shaped part, the method comprising: pressing the processed member to plastically deform the processed member and causing it to flow into the gap to form a cylindrical part.