WO2006008861A1

WO2006008861A1 - Chassis, and method and mold for manufacturing the same

Info

Publication number: WO2006008861A1
Application number: PCT/JP2005/007289
Authority: WO
Inventors: Akira Mashima; Ryusuke Mashima
Original assignee: Mashima Seisakusyo Co., Ltd.
Priority date: 2004-07-20
Filing date: 2005-04-08
Publication date: 2006-01-26
Also published as: JPWO2006008861A1

Abstract

A chassis used as the base panel of a TV, and a method and a mold for manufacturing the chassis. The chassis is manufacturable at remarkably low cost since projected parts (cell spacers) can be easily molded by only one processing by using a cold forging method for locally compressing a flat sheet metal to be processed. The chassis (A) on which the projected parts (cell spacers (2)) are projectedly formed on the flat surface of the flat sheet metal (1) by integral molding is so formed that the cell spacers are driven out by locally compressing the flat sheet metal in the plate thickness direction by the cold forging method to projectedly mold the cell spacers integrally with the flat sheet metal.

Description

Description Chassis and chassis manufacturing method, and chassis manufacturing mold

The present invention relates to a chassis used as a base panel for electrical products such as televisions and audio equipment and other industrial equipment, a method for manufacturing the chassis, and a manufacturing mold for the chassis. Background art

In a chassis used as a base panel for televisions, etc., a rib for reinforcing the cell spacer as a protruding part is projected on a metal flat plate. 刖 The cell spacer is screwed to various parts, In addition, the reinforcing ribs prevent distortion of the base panel.

The conventional chassis is formed so that a hole is made in a metal flat plate at a position where the cell spacer is projected, and a pin is fitted into the hole, and the force is squeezed to project as a cell spacer. It was.

Further, the reinforcing rib is also formed so that a rib member separate from the metal flat plate is used and this rib member is projected from the metal flat plate by a connecting means such as caulking.

However, in such a chassis, in addition to drilling holes in the metal flat plate, processing to make a member (pin or rib member) separate from the metal flat plate, and processing to caulk and join this separate member are necessary. The manufacturing man-hours and the number of parts increased, leading to the problem of high manufacturing costs. Conventionally, as a part forming technique in which a pin portion is projected integrally by a cold forging method on a flat plate portion, for example, Japanese Patent Laid-Open No. 7-3104 What is described in the gazette is proposed.

This conventional technique compresses a round bar material between a pair of dies by a cold forging method, crushes the round bar material into a flat shape, and forms a flat plate portion. The pin part was to be molded.

However, this conventional technology is a cold forging method in which the entire round bar material is compressed between molds, so that surplus parts (burrs) overhang around the flat plate part that is flattened and formed. There is a problem in that the work (trimming) to remove this surplus part is required, which increases the number of work steps, and is disadvantageous in terms of manufacturing time and manufacturing cost.

In addition, a metal flat plate with a large area, such as a chassis used as a base panel of a television or the like, is an object to be processed, and this is entirely cold-forged between a pair of dies as in the past. It can be said that compressing is not practical from the standpoint of press machine capability and mold production.

The present invention is a chassis used as a base panel of a television or the like, and by using a cold forging method in which a metal flat plate as a processing object is locally compressed, unlike the conventional one, Providing a chassis that can easily form protrusions (cell spacer reinforcing ribs) by pressing, and that prevents the protrusions from being attached poorly to a metal flat plate. A second problem is to provide a chassis manufacturing method in which the protrusion can be integrally formed on a metal flat plate by a single press process. The third challenge is to provide the service. Disclosure of the invention

In order to solve the first problem, the chassis according to claim 1 of the present invention is: It is a chassis in which the protruding part is projected by integral molding on the flat surface of the metal flat plate,

The metal flat plate is locally compressed in the plate thickness direction by a cold forging method so that the protruding portion is formed by stamping, and the protruding portion protrudes integrally with the metal flat plate.

In order to solve the second problem, the chassis manufacturing method according to claim 3 of the present invention provides:

A method of manufacturing a chassis in which protrusions are integrally formed on a flat metal plate,

The metal flat plate is used as an object to be processed, and the metal flat plate is locally compressed in the plate thickness direction by a cold forging method so that the protrusion is formed by stamping, and the protrusion is formed integrally with the metal flat plate. It was set as the structure made to do.

In order to solve the above third problem, a chassis manufacturing die according to claim 5 of the present invention provides:

A manufacturing die for a chassis, in which a protruding portion is integrally formed on a flat metal plate,

A punch and a die that are opposed to each other with a metal flat plate to be processed are sandwiched, and the punch is slidably fitted into a guide hole formed in the stripper,

A molding hole is formed on the die surface or punch surface,

With the stripper and the die, the metal plate is locally compressed in the plate thickness direction by the punch while the peripheral portion of the punch of the metal plate is pressed in the plate thickness direction. The projecting part is formed so as to project.

6. The chassis manufacturing die according to claim 5, wherein an inclined surface is formed around the forming hole so as to be gradually deepened toward the center of the hole. There is an embodiment (Claim 6).

The chassis manufacturing die according to claim 5 or 6, wherein the frictional resistance between the surface other than the peripheral surface of the forming hole and the metal flat plate is larger than the frictional resistance between the peripheral surface of the forming hole and the flat metal plate. As described above, there is an aspect in which the surface roughness other than the peripheral surface of the molding hole is formed to be rougher than the surface roughness of the peripheral surface of the molding hole (Claim 7).

In the chassis, the chassis manufacturing method, and the chassis manufacturing mold of the present invention, there is provided an aspect in which the protrusion is a cell spacer for mounting components and / or a reinforcing rib (claims 2, 4, 7). is there. Brief Description of Drawings

FIG. 1 is an overall perspective view showing an embodiment of the chassis of the present invention.

FIG. 2 is a cross-sectional view showing the main part of the chassis.

FIG. 3 is an explanatory view showing an embodiment of a chassis manufacturing mold and a manufacturing method.

FIG. 4 is an explanatory view showing another embodiment of a chassis manufacturing mold and manufacturing method.

FIG. 5 is an explanatory view showing another embodiment of the manufacturing mold.

FIG. 6 is an explanatory view showing another embodiment of the manufacturing mold.

FIG. 7 is an overall perspective view showing another embodiment of the chassis of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the examples shown in the drawings. FIG. 1 is an overall perspective view showing an embodiment of the chassis of the present invention, and FIG. 2 is a cross-sectional view showing the main part of the chassis.

In this embodiment, the cell spacer 2 is formed as the protruding portion. Will be described as an example.

The chassis A of this embodiment is used as a base panel of a plasma television. A cell spacer 2 for mounting a large number of parts as protrusions is formed on the flat surface of a metal flat plate 1 made of aluminum. Projected at

The cell spacer 2 is formed by stamping (plastic working) by locally compressing the metal flat plate 1 in the plate thickness direction by a cold forging method, and projecting integrally with the metal flat plate 1. Yes.

The cell spacer 2 has a pilot hole for screwing a tap screw.

In this embodiment, after the cell spacer 2 is formed, the pilot hole 2 2 is formed by drilling with a press.

It is also possible to form the cell spacer 2 and the pilot hole 22 at the same time as the cell spacer is formed.

Next, FIG. 3 is an explanatory view showing an embodiment of the manufacturing mold and manufacturing method of the chassis A.

The chassis A is manufactured by using a metal mold 1 attached to a press machine with the metal flat plate 1 as an object to be processed. As the metal mold, the punch 3 and the die facing each other with the metal flat plate 1 sandwiched therebetween are formed. Has four.

The punch 3 is formed in a circular shape in cross section, and its base end portion is a punch plate.

It is fixed to 30 and its tip is slidably fitted in a guide hole 50 formed in the stripper 5.

The stripper 5 is elastically supported by an elastic member (not shown) such as a spring in a state where a gap S corresponding to the driving amount of the punch 3 is held between the stripper 5 and the punch plate 30. ing.

The die 4 is disposed opposite to the punch 3 with the metal flat plate 1 interposed therebetween. The die surface 40 has a cell space at an axial center position C of the punch 3. A forming hole 41 for forming the spacer 2 is formed in a circular shape corresponding to the planar shape of the cell spacer 2.

A land 42 having a diameter corresponding to the diameter of the cell spacer 2 to be formed is formed in the lower portion of the forming hole 4 1, and the diameter of the hole from the land 4 2 is larger than the diameter of the cell spacer 2. Is also formed slightly larger.

In addition, an inclined surface 4 3 is formed around the lower portion of the forming hole 4 1 and is inclined so as to be gradually deepened toward the center of the hole within a range corresponding to the punch surface 3 1.

Further, the surface around the forming hole 4 1, that is, the surface other than the periphery of the forming hole 4 1, that is, the surface other than the inclined surface 4 3 and the metal flat plate 1, rather than the frictional resistance F 1 between the surrounding surface of the forming hole 4 1, that is, the inclined surface 4 3 and the metal plate 1. The surface roughness of the surface other than the inclined surface 4 3 is made rougher than the surface roughness of the inclined surface 4 3 so that the frictional resistance F 2 is larger (F 1 <F 2).

In this case, the surface other than the inclined surface 43 may be subjected to surface treatment so as to reduce the surface roughness by ceramic spraying or the like, so that F 1 <F 2.

In the embodiment, the surfaces other than the inclined surface 4 3 are roughened, and the inclined surface 4 3 is mirror-finished (wrapped) so that F 1 <F 2 is satisfied. In the manufacturing method by the cold forging method using the punch 3 and the die 4, as shown in FIG. 3 (i), the metal flat plate 1 is set on the stripper 5, and then, FIG. The die 4 is lowered as shown in Fig. 3 and the die 4 is lowered to the stroke end as shown in Fig. 3 (c).

As a result, the metal flat plate 1 as the object to be processed is locally compressed in the plate thickness direction by the area of the punch surface 3 1, and as shown in FIG. In addition, the cell spacer 2 is punched into the molding hole 41, and the chassis A in which the cell spacer 2 is integrally formed with the metal flat plate 1 can be manufactured. In particular, in the present invention, since a metal flat plate as a workpiece is locally compressed in the thickness direction, the cold forging method is applied to a metal flat plate having a large area such as a chassis. It became possible.

The chassis A has a large number of cell spacers 2, and each cell spacer 2 is formed so that the large number of cell spacers 2 can be simultaneously formed by a single press operation. Are provided with a punch 3 and a die 4 as molding dies.

Further, it is necessary to move the metal meat that moves in accordance with the compression by the punch 3 toward the forming hole 4 1. At this time, the punch surrounding portion of the metal flat plate 1 is moved to the stripper 5 and the die 4. Therefore, it is possible to restrain the movement of the metal flesh that expands in the thickness direction.

In addition, since the portion compressed by the punch 3 is a local portion of the metal flat plate 1, the periphery of the compression portion remains surrounded by metal flesh. Therefore, the movement of the metal meat to be separated from the forming hole 41 can be restrained by the metal meat surrounding the compression portion.

In this way, the movement of the metal meat that expands in the plate thickness direction and the movement of the metal meat that moves away from the forming hole 41 can be constrained. The cell spacer 2 can be punched into the forming hole 4 1.

Further, when the inclined surface 4 3 is formed around the forming hole 4 1 as in the embodiment, the metal surface is forcibly moved toward the forming hole 4 1 by the inclined surface 4 3 during compression. Since the metal meat can be sufficiently moved toward the cell spacer 2 which is punched into the forming hole 4 1, the cell spacer 2 can be reliably formed.

In addition, if the frictional resistance between the inclined surface 4 3 (the surface surrounding the forming hole 4 1) and the metal flat plate 1 is made smaller than that of the other parts, the movement of the metal meat accompanying the compression will be reduced. Since it can be oriented in the direction of the forming hole 4 1, and the metal meat can be sufficiently moved toward the cell spacer 2, the forming of the cell spacer 2 is ensured.

The cell spacer 2 is formed by the volume of metal that moves by compression by the punch 3, and therefore the volume of the recess 6 (shown in FIG. 2) formed by the compression of the punch 3. Is formed so that it substantially matches the volume of cell spacer 2.

Therefore, the diameter of the punch 3 and the depth of the recess 6 are set in accordance with the diameter of the cell spacer 2 to be formed and the height of the cell spacer 2.

Next, FIG. 4 is an explanatory view showing another embodiment of the chassis manufacturing mold and manufacturing method.

In this example, the forming hole 4 1 is formed on the punch surface 3 1, and the cell spacer 2 is formed in the order of FIG. 4 (i), FIG. 4 (mouth), and FIG. 4 (eight). The configuration described above and other configurations and operations are the same as those of the manufacturing mold and the manufacturing method shown in FIG.

In the embodiment of FIG. 3, the recess 6 is formed on one surface of the metal flat plate 1 by compression with the punch 3, and the cell spacer 2 is formed on the surface opposite to the surface on which the recess 6 is formed. It will be a forward launch.

In the embodiment shown in FIG. 4, both the recess 6 formed by compression with the punch 3 and the cell spacer 2 are formed on one surface of the metal flat plate 1, and the other surface of the metal flat plate 1 is flat. It is the so-called rear launch that is formed as it is.

In this way, it is only necessary to determine whether to form by front punching or molding by rearward punching.

In addition, the cell spacer 2 formed as described above has a tap screw. In this case, the pilot hole 2 2 may be formed by cutting with a drill, or after the cell spacer 2 is formed, in the next press process The pilot hole 2 2 may be formed.

As shown in FIGS. 5 and 6, a pilot hole forming pin 4 4 is attached to the inside of the molding hole 4 1, and the pilot hole 2 2 is formed in the cell spacer 2 by the pilot hole forming pin 4 4. You can also

In the embodiment, the peripheral surface of the forming hole 4 1, that is, the frictional resistance between the inclined surface 4 3 and the metal flat plate 1 is made small, but the peripheral surface of the forming hole 4 1 is formed even when the inclined surface 4 3 is not formed. (A range corresponding to the punch surface 3 1) and the metal plate 1 can be formed with a small frictional resistance.

Also, for specific processing, the peripheral surface (inclined surface 4 3) of the forming hole 4 1 may be mirror-finished.

Further, in the embodiment of FIG. 4, the frictional resistance between the surface 4a of the die 4 and the metal flat plate 1 may be made larger than the frictional resistance between the inclined surface 4 3 and the metal flat plate 1, and processing for that purpose. As an alternative, the surface 4 a of the die 4 may be roughened, or a piece of paper may be interposed between the surface 4 a of the die 4 and the metal flat plate 1.

In the embodiment, the case where the cell spacer 2 is formed as the protruding portion is taken as an example. However, as shown in FIG. 7, the reinforcing rib 9 is integrally formed as a protruding portion on the flat surface of the metal flat plate 1 as shown in FIG. Is configured in the same manner as in the above embodiment.

In this case, the forming hole 41 is formed into a groove-shaped hole corresponding to the planar shape of the reinforcing rib 9, and the cross-sectional shape of the punch 3 is formed into a narrow rectangular shape.

It is also possible to integrally form the cell spacer 2 and the reinforcing rib 9 as protrusions on the flat surface of the metal flat plate 1, and in this case, the cell spacer 2 and the reinforcing rib 9 may be formed in separate steps. However, if the press has the capacity (the number of TONs), it may be formed simultaneously. In addition, as the metal flat plate, a metal plate capable of plastic deformation, such as an aluminum plate, a copper plate, and a steel plate, can be used.

Further, in the present invention, the metal meat of the metal flat plate is moved toward the forming hole along with the compression by the punch. In this case, the strip thickness and the die are constrained in the plate thickness direction, and from the forming hole. The movement of the metal meat to be separated is restrained by the surrounding metal meat.

At this time, if the plate thickness of the metal flat plate is thick, the metal plate with low deformation resistance (such as aluminum plate or copper plate) will not be able to exert the restraining force at the center of the plate thickness of the metal plate due to the compression by the punch. Metallic meat may move in the plate thickness direction or away from the forming hole.

As a result, there arises a problem that the periphery of the protruding portion is distorted and deformed. Therefore, it is preferable to use a metal plate having a thickness of 3 mm or less as the metal flat plate in the present invention. Industrial applicability

In the chassis of the present invention (Claim 1), since the protruding portion (cell spacer reinforcing rib for mounting the component) is integrally formed on the metal flat plate, unlike the conventional case, the metal flat plate has a hole. Opening, processing to create a separate member (pin or rib member) from the metal flat plate, and connecting this separate member by caulking, eliminates the need for processing.

In addition, since the projecting portion can be integrally formed on the metal flat plate by a single press process, the manufacturing cost can be greatly reduced.

In addition, since the projecting part is integrally formed on the metal flat plate, the strength higher than that obtained when caulking and connecting another member such as a pin is obtained, and the weight of the metal flat plate itself remains unchanged. The chassis can be significantly lightened. By using the chassis manufacturing method of the present invention (Claim 3) and the chassis manufacturing die (Claim 5), the protruding portion can be projected in one piece on the metal flat plate by one press working. .

In particular, the cold forging method is used in which a metal flat plate as a workpiece is locally compressed in the plate thickness direction. Therefore, the cold forging method should be applied to a metal flat plate with a large area such as a chassis. Became possible.

In the cold forging method used in the present invention, a metal flat plate is locally compressed in the plate thickness direction by a punch, and the protruding portion is punched into the forming hole by the movement of the metal meat accompanying this compression. It is.

It is necessary to move the metal meat that moves with the compression toward the forming hole. At this time, the punch peripheral portion of the metal flat plate is clamped between the stripper and the die. It can restrain the movement of the metal meat that is going to expand in the thickness direction.

In addition, since the portion to be compressed by the punch is a local portion of the metal flat plate, the periphery of the compressed portion is surrounded by metal meat. Therefore, the movement of the metal meat that is about to leave the forming hole can be restricted by the metal meat that surrounds the periphery of the compression portion.

In this way, the movement of the metal meat that expands in the plate thickness direction and the movement of the metal meat that moves away from the forming hole can be restrained, so that the moving metal meat that accompanies compression is directed toward the forming hole. The protrusion can be driven out into the forming hole by moving it.

As in the present invention (Claim 6), in the manufacturing die of the chassis, when the inclined surface is formed around the forming hole, the inclined surface is formed when the metal flat plate is locally compressed in the plate thickness direction by the punch. Can forcibly direct the movement of the metal meat toward the forming hole, and the metal meat can be sufficiently moved toward the protruding portion that is punched into the forming hole. The protruding portion can be reliably molded.

Further, as in the present invention (Claim 7), if the frictional resistance between the peripheral surface of the forming hole and the metal flat plate is made smaller than that of the other part in the chassis manufacturing die, the metal meat accompanying compression is reduced. Can be directed to the direction of the forming hole.

Claims

A chassis in which a protruding portion is integrally formed on a flat surface of a metal flat plate,

The metal plate is compressed in the plate thickness direction by a cold forging method so that the projecting portion is formed by stamping, and the projecting portion is integrally formed with the metal plate. .

The chassis according to claim 1, wherein the projecting portion is a cell spacer for mounting components and Z or a reinforcing rib.

A method of manufacturing a chassis in which protrusions are integrally formed on a flat metal plate.

The metal flat plate is used as an object to be processed, and the metal flat plate is locally compressed in the plate thickness direction by a cold forging method so that the protrusion is formed by stamping, and the protrusion is integrally formed with the metal flat plate. A chassis manufacturing method characterized by projecting.

4. The method for manufacturing a chassis according to claim 3, wherein the protruding portion is a cell spacer for mounting components and / or a reinforcing rib.

A manufacturing die for a chassis in which a protruding portion is formed by integral molding on a flat metal plate,

A punch and a die that are opposed to each other with a metal flat plate to be processed interposed therebetween, and the punch is slidably fitted into a guide hole formed in the stripper,

A molding hole is formed on the die surface or punch surface,

With the stripper and die, the metal plate is localized by the punch while the peripheral portion of the metal plate punch is pressed in the plate thickness direction. The chassis manufacturing mold is characterized in that it is formed so as to squeeze out the protruding portion into the molding hole by being compressed in the plate thickness direction.

6. The chassis manufacturing mold according to claim 5, wherein an inclined surface is formed around the forming hole so as to be gradually deepened toward the center of the hole.

The chassis manufacturing die according to claim 5 or 6, wherein the frictional resistance between the surface other than the peripheral surface of the forming hole and the metal flat plate is larger than the frictional resistance between the peripheral surface of the forming hole and the flat metal plate. A chassis manufacturing mold in which the surface roughness other than the peripheral surface of the molding hole is rougher than the surface roughness of the peripheral surface of the molding hole.

The chassis manufacturing mold according to claim 5, 6 or 7, wherein the protrusion is a cell spacer for mounting a component and / or a reinforcing rib.