JP2001137972A - Universal forming die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an universal forming die capable of reducing a diameter size of needle tools, making the tools dense, precisely making an arbitrary curved face of a bending die and obtaining a formed part of a small dimension. SOLUTION: In an universal forming die to conduct hot forming of a formed part having a three dimensional curved face with using many spherical head needle tools with adjusting a protrusion height, the spherical head needle tools 2 are formed to a cross sectional square shape mutually aggregating/arranging in a square die frame 1, a lateral load acting to the spherical head needle tools 2 in bending is received by the side plate part of the die frame 1 through the spherical head needle tools 2 adjacent each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal molding die, and more particularly to a universal molding die used for molding a blade having a three-dimensional curved surface (such as an impeller blade).

[0002]

2. Description of the Related Art As universal molding dies, press plates (dummy plates) serving as die surfaces for three-dimensional bending of thick plates are arranged in a point array in Japanese Patent No. 2594977 and Japanese Patent Publication No. Hei 7-22791. Numerous ball-point needle tools (punches)
Is disclosed.

[0003] According to these molds, not only a dedicated tool but also a pressurizing device of a general-purpose press can be used, and by changing the protruding height of each ball-head needle-shaped tool, a variety of types can be obtained. A mold having a mold surface that can be formed corresponding to a three-dimensional curved surface can be easily formed each time, and low cost can be achieved.

[0004]

By the way, in both cases, after the pressing plate is formed and before the pressing plate is integrated, each of the ball-point needle-shaped tools is rotated to form a screw mechanism between the pressing frame and the mold frame. The height of the projections (the vertical position) can be adjusted.

However, the latter is problematic in terms of strength because the screw mechanism receives a lateral load acting on the ball-pointed needle-shaped tool. On the other hand, in the former, a guide is provided on each ball-head needle-shaped tool to receive a lateral load, but the structure is complicated.

[0006] In any case, both of them receive a vertical load (vertical axial force) and a lateral load (lateral force) acting on the ball-pointed needle-shaped tool in one structure (one location). Tool with small diameter
There is naturally a limit in increasing the density, and there is a problem that a bending mold having an arbitrary curved surface cannot be produced with high accuracy and a molded product having a small size cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and enables a small-diameter and dense needle-shaped tool to accurately form a bent mold having an arbitrary curved surface and a small-sized molded product. It is an object of the present invention to provide a universal mold capable of obtaining the following.

[0008]

According to a first aspect of the present invention to achieve the above object, a molded product having a three-dimensional curved surface is formed by using a large number of needle-like tools whose projection height can be adjusted. In a universal forming die for hot forming, the needle-shaped tools are densely arranged and arranged in a frame-shaped die frame, and a lateral load acting on the needle-shaped tools at the time of working is applied to the die frame through the adjacent needle-shaped tools. It is characterized in that it is made to be received at.

A second aspect of the present invention is characterized in that a play backing plate for tightening the needle-shaped tool, which is tightened only at the time of machining, and is set in the mold frame.

A third aspect of the present invention is characterized in that the needle-shaped tool has a polygonal cross-sectional shape.

According to a fourth aspect of the present invention, the needle-shaped tool comprises a female screw member on the tip side and a male screw member screwed to the female screw member and supported on the mold frame. Features.

[0012] The invention according to claim 5 of the present application is characterized in that the male screw member is supported on the mold frame side via a detent means so that it cannot rotate if the torque is less than a predetermined torque.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a universal mold according to the present invention.

FIG. 1 is an overall perspective view of a universal molding die showing an embodiment of the present invention, and FIG.

As shown in FIG. 1, a large number of ball-tip needle-shaped tools 2 are provided in a rectangular frame (frame) -shaped frame 1 constituting an upper mold or a lower mold without any gaps vertically and horizontally due to a cross-sectional shape described later. They are densely arranged in a line.

At two sides of the mold frame 1, a play filling plate 3 is provided.
When the mold frame 1 is mounted as an upper mold or a lower mold on a pressing device of a hydraulic press (not shown) at the time of bending, a plurality of (in the illustrated example, three pieces for one backing plate 3 in the illustrated example) ) By screwing in the bolts 4, a large number of ball-head needle-shaped tools 2 are tightened from the side and are loosely packed.

As shown in FIG. 2, the mold frame 1 comprises:
A side plate 5 having a predetermined height and a lower portion formed thick, and a bottom plate (pressure-resistant plate) 6 integrally provided in a thick portion of the side plate 5 in a raised bottom shape.
The ball-point needle-shaped tool 2 is mounted on the bottom plate 6 via a large number of mounting holes 7 formed at equal pitches in the vertical and horizontal directions so as to adjust the protruding height.

The ball-headed needle-shaped tool 2 comprises a female screw member 8 having a spherical tip at the cross section and a male screw member 9 screwed into the female screw portion 8a of the female screw member 8. The internal thread members 8 of the needle-shaped tool 2 are arranged in the mold frame 1 without any gap due to their cross-sectional shapes.

The male screw member 9 has a flange 9a integrally formed at an intermediate portion thereof positioned above the bottom plate 6, and can be forcedly rotated by a predetermined torque or more in the mounting hole 7 and is supported so as not to be vertically movable. .

That is, the bottom half of the male screw member 9 is
Washers 10a and 10b are fitted and inserted on the upper and lower surfaces, and a spring washer 11 as a detent means is fitted and inserted immediately below the lower washer 10 so that a nut 12 is inserted.
Therefore, if the torque is less than the predetermined torque, the rotation is impossible.

A polygonal section 9b is formed at the lower portion of the male screw member 9 so that it can be fitted non-rotatably with a chuck or the like of an automatic rotating device (not shown).

In FIG. 2, reference numeral 13 denotes a reinforcing member,
A large number of pillars 13b that receive the vertical axial force of the ball-pointed needle-shaped tool 2 at a constant pitch are provided upright at a portion on the base plate 3a where the ball-pointed needle-shaped tool placement portion of the bottom plate 6 is flanked.

The reinforcing member 13 is attached to the mold frame 1 by an appropriate means when the mold frame 1 is attached to a pressing device of a hydraulic press (not shown) as an upper mold or a lower mold during bending. is there.

With such a configuration, when forming a three-dimensional curved surface bending die (upper die or lower die), first, the reinforcing member 13 is removed from the mold frame 1 and the backlash filling plate is formed. With the 3 loosened, the projecting height of the predetermined number of ball-head needle-shaped tools 2 is adjusted to a preset height corresponding to a molded product such as an impeller blade.

That is, a chuck or the like of an automatic rotating device (not shown) is fitted to the polygonal section 9b of the male screw member 9 of the predetermined needle-like tool 2 and rotated with a predetermined torque or more.

At this time, since the male screw member 9 does not rotate under a predetermined torque under the action of the spring washer 11, the male screw member 9 does not rotate along with the chuck or the like, and the phase matches the chuck and the chuck and the like, and quickly. Fit.

Then, by the rotation of the male screw member 9,
The female screw member 8 screwed to the male screw member 9, which is stopped by the adjacent members being in surface contact with each other, is raised and lowered, and the protrusion height thereof is adjusted.

After the protrusion height of the predetermined number of ball-head needle-shaped tools 2 has been adjusted in this way, if the play padding plate 3 is tightened, in this embodiment, the ball-head needle-shaped tools 2 are densely packed.・ Each ball-head needle-shaped tool 2 whose height has been adjusted because it is arranged
The aggregate of the spherical tip portions in the (female screw member 8) can be used directly as the mold surface.

That is, a bending die having an arbitrary curved surface can be formed without using the pressing plate (dummy plate) described in the prior art.

Thereafter, the reinforcing member 13 is attached to the mold frame 1.
Attaching as a top or bottom mold to the press of a hydraulic press (not shown), and bending a steel plate etc.,
A molded product such as an impeller blade having a three-dimensional curved surface is molded.

It goes without saying that the upper and lower mold frames 1 and 1 of the lower mold frame 1 are vertically symmetrically adjusted with respect to the projecting heights of the ball-shaped needle-shaped tools 2.

In this embodiment, the lateral load (lateral force) applied to each ball-headed needle-shaped tool 2 at the time of bending is finally transmitted to the side plate 5 of the mold frame 1 via the adjacent female screw member 8. The vertical load (vertical axial force) on the male screw member 9
Only works, so that a normal thin male screw can be used.

When the vertical axial force of each ball-headed needle-shaped tool 2 is transmitted to the bottom plate 6, it can be received by the leg 13 b in the immediate vicinity, and there is no problem in rigidity and strength.

As a result, the small diameter of each ball-headed tool 2
The density can be sufficiently increased, a bending mold having an arbitrary curved surface can be accurately produced, and a small-sized molded product can be obtained.

The present invention is not limited to the above-described embodiment, and the cross-sectional shape of the female screw member 8 may be a polygon other than a square, or the male screw member 9 may be manually turned without departing from the gist of the present invention. It goes without saying that various changes are possible.

[0036]

As described in detail above, claim 1 is as follows.
According to the invention, in a universal molding die for hot-forming a molded product having a three-dimensional curved surface by using a large number of needle-shaped tools whose protruding height is adjustable, the needle-shaped tool is placed in a frame-shaped mold frame. It is characterized in that the lateral load acting on the needle-shaped tool at the time of machining is received by the mold frame via the needle-shaped tool adjacent to each other, so that the diameter and density of the needle-shaped tool can be reduced. It is possible to produce a bent mold having an arbitrary curved surface with high accuracy and to obtain a small-sized molded product.

According to the second aspect of the present invention, a play backing plate for tightening the play of the needle-shaped tool, which is tightened only at the time of machining, is housed in the mold frame. The height adjustment of the needle-shaped tool can be performed smoothly and easily by loosening the backlash filling plate when adjusting the height of the tool.

According to the third aspect of the present invention, since the cross-sectional shape of the needle-shaped tool is polygonal, adjacent needle-shaped tools are brought into surface contact with each other, and the lateral load is reduced. , And rotation is prevented from each other, so that height adjustment by the screw mechanism can be easily performed.

According to a fourth aspect of the present invention, the needle-shaped tool comprises a female screw member on the tip side and a male screw member screwed to the female screw member and supported on the mold frame side. Therefore, the height adjustment mechanism is simplified, the needle-like tool can be removed, and maintenance and the like are facilitated.

According to the fifth aspect of the present invention, the male screw member is supported by the mold frame side via a rotation preventing means so as not to rotate when the torque is less than a predetermined torque. The phase is matched with the chuck and the like without being rotated by the chuck or the like, and the fitting is quickly performed.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a universal mold, showing one embodiment of the present invention.

FIG. 2 is a cross-sectional perspective view of an essential part of the same.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 mold frame 2 ball-head needle-shaped tool 3 backlash plate 4 bolt 5 side plate 6 bottom plate 7 mounting hole 8 female screw member 8a female screw portion 9 male screw member 9a flange 9b polygonal section 10a, 10b washer 11 spring washer 12 nut 13 reinforcing member 13a Substrate 13b Pillar

Continued on the front page (72) Inventor Masanori Fujimura 4-6-22 Kannonshinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Works F-term (reference) 4E050 AA01 AA10 BA02 JC03 JD03 4F202 AH04 CA30 CB01 CD16 CK25 CK42 CK83

Claims (5)

[Claims] 1. A universal molding die for hot-forming a molded product having a three-dimensional curved surface by using a large number of needle-shaped tools whose projection height can be adjusted, wherein said needle-shaped tool is placed in a frame-shaped mold frame. A universal molding die which is densely arranged and arranged to receive a lateral load acting on the needle-shaped tool at the time of machining by the mold frame via mutually adjacent needle-shaped tools. 2. The universal molding die according to claim 1, wherein a backlash filling plate which is tightened only at the time of processing in the mold frame and performs backlashing of the needle-shaped tool is housed. 3. The universal mold according to claim 1, wherein the needle-shaped tool has a polygonal cross section. 4. The needle-shaped tool includes a female screw member on a tip side,
4. A male screw member screwed to said female screw member and supported on the mold frame side.
The described universal mold. 5. The universal molding die according to claim 4, wherein said male screw member is supported on a mold frame side via a rotation preventing means so as not to rotate when the torque is less than a predetermined torque.