JPS6018504B2 - press mold - Google Patents

Description

[Detailed description of the invention] The present invention relates to a press mold for processing a material using an upper mold and a lower mold.

Generally, the upper and lower molds that make up a press mold are made by cutting and polishing steel cores, and are extremely expensive. In this way, expensive press molds are generally used for products whose material is of uniform size, and the product cost is not that high even if press processing is applied, but when the material is not of uniform size and has minute dimensions, the product cost is not so high. For products with different types and processing, such as key thread processing, where there are thousands of product types, manufacturing a corresponding number of press dies would significantly increase the product cost, so we do not accept it. It was considered a thing.

For this reason, conventionally, the key thread of the key has generally been processed by cutting, which allows for easy dimensional changes. Taking these facts into consideration, the present invention provides an extremely inexpensive press mold that is suitable for high-mix, low-volume production.
The above objective is achieved by laminating punched flat plates to create an upper mold and a lower mold.

For this reason, the present invention has a die receiving part formed by stacking punched flat plates and fixing them to each other, and forming a die holding hole opened at one end in the middle layer flat plate, and a die holding hole in the die receiving part. A die having a shearing blade inserted and fixed in the die holding hole and a punched flat plate are laminated and fixed to each other, and a punch hole is formed through the middle layer plate, and a stopper plate hole for the punch is formed in the middle layer flat plate. a punch receiving portion, a punch fixed to the punch receiving portion via a stopper plate and having an end protruding from the punch receiving portion, and a spring for separating the die receiving portion and the punch receiving portion from each other. The die and punch receiving parts are brought close to each other so that the shearing blades of the die and punch shear the press material.
Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, the press mold 10 is composed of an upper mold 12, a lower mold 14, a mounting bolt 16, and a return spring 18. This upper mold 12 includes punched flat plates 20, 22, 24 and a punch 26.
, 28, a stopper plate 30, and a retainer 31.

As shown in Figure 4, the flat plate is a plate material (preferably made of SCM-3) that is punched into a rectangular shape, with short legs symmetrical to each other approximately in the center. T-shaped punch holding holes 32, 34 and a pin holding hole 36 are formed, and four large holes 38 are formed near the sides, and nine caulking pin holes 40 are formed near the periphery. Three fixing pin holes 42 are formed at each position.

Further, as shown in FIG. 5, the flat plate 22 is made of the same material and has the same shape as the flat plate, but instead of the large hole 38, a mounting bolt hole 39 of a smaller diameter is formed in the same layer.
Further, the flat plate 24 is made of the same material as the flat plate 22 and has the same shape, but as shown in FIG. It has a similar shape.

Next, as shown in FIG. 7, the punches 26 and 28 have a substantially T-shaped planar shape with a head 46 and a short leg 48 connected at right angles to hold the punches in the plates 20, 22, 24. Iron is inserted into the holes 32 and 34.

Furthermore, a wave-shaped shearing blade 50 for key thread processing is cut at the lower end of the foot portion 48, and a rectangular stopper plate receiving groove 52 is formed in the horizontal direction at the vertically intermediate portion. Also, the material of these punches 26 and 28 is SKS-
3 is preferred. The lower mold 14 is made up of the punched flat plate 20, the punched flat plate 60, and a die 62.

As shown in FIG. 8, this flat plate 60 is made of the same material as the flat plate 22, but a rectangular die holding hole 64 is cut out from one side of the flat plate 22, so that the flat plate 60 has a U-shape as a whole.

This die holding hole 94 has a size that includes the punch holding holes 32, 34 and the punch holding hole 36. The die 62 is preferably made of the same material as the punches 26 and 28, and as shown in FIG.
Approximately rectangular punch relief grooves 68, 70 are formed from both sides and are sized to fit the foot portions 48 of the punches 26, 28, and shear blades 72, 74 are provided at the bottoms of these punch relief grooves 68, 70. It is engraved.

As a result, the shearing blades 72 and 74 are connected to the punch relief groove 6.
When the foot portions 48 of the punches 26, 28 hang down inside the punches 8, 72, they move sideways with the shearing blade 50 and are inserted into the key insertion groove 66. A key thread is carved into the key 76 (two-dot chain line in FIG. 1). It is supposed to be done. Next, the roughening order of this mold 10 will be explained with reference to FIG. 10.

FIG. 10A shows the assembly of the upper mold 12, in which two flat plates 20, 24, 22, and 20 are stacked from top to bottom to form a laminated punch receiving part, and these punch holding parts are stacked one on top of the other. Punches 26, 2 in holes 32, 34 and holding hole 36
8 and 32 are inserted, respectively.

At the time of assembly, if a rectangular stopper plate 30 of a size that can be inserted into the stopper plate hole 44 of the flat plate 24 is inserted, the punches 26 and 28 can be inserted into the stopper plate hole 44 of the flat plate 24 as shown in FIG. The stopper plate 30 is engaged with the stopper plate receiving groove 52, and the upper portions of the punches 26, 28 are held by the flat plates 20, 22, 24 to prevent them from coming off. Further, the marking 32 is in the shape of a square prism, and like the punches 26 and 28, a stopper plate hole is provided and it is fixed to the upper die 12 by a stopper plate 30, and a number is engraved on the lower end of the key. The number 76 is engraved on the navel. In addition, the fixing pin 80 is press-fitted into the fixing pin hole 42 and the caulking pin 82 is press-fitted into the caulking pin hole 40 in these flat plates, so that the upper mold 1
2 so that the mutual positions of the flat plates do not deviate from each other and that they do not separate from each other. Next, as shown in FIGS. 2 and 3 and 10B to 10D, the lower die 14 is roughly assembled by stacking four flat plates 60 on top of the three flat plates 20, and then stacking seven flat plates 20 on top of the four flat plates 60. It is a laminated die receiving part, and like the upper mold 12, a fixing pin 80 and a caulking pin 82 are provided.
It is fixed by.

Here, among the seven flat plates 20, four flat plates 60 are placed at the bottom.
A key insertion groove 84 is formed in the longitudinal direction of the die holding hole 64 of the flat plate 60 on the lower surface of the flat plate 20 that is in contact with the uppermost stage of the flat plate 20.
The key insertion groove 66 of the die 62 which is iron-inserted into the die holding hole 64 of the flat plate 60 and a part of the key insertion groove 66 are passed through to form an uneven key insertion groove (see FIGS. 2 and 3 and FIG. 10D). .

Next, the upper mold 12 and lower mold 14 assembled in this way are
As shown in FIG. 0E and FIG.
A mounting bolt 16 is inserted through the mounting bolt 16 from the bottom to the top, and a spring 18 is mounted on the mounting bolt 16.

Furthermore, this mounting bolt 16 is connected to the flat plate 2 that constitutes the upper die 12.
, 22, 24 and the mounting bolt hole 39, then the nut 90 is screwed onto the threaded end portion.

As a result, the head 92 of the mounting bolt 16 is accommodated in the large diameter hole 38 in the three flat plates 201 located below the lower mold 14, and the nut 90 is accommodated in the large diameter hole 38 in the two flat plates 201 located above the upper mold 12. They are accommodated in the large-diameter holes 38 in the mold 10 so as not to protrude in the vertical direction of the mold 10, respectively.

Also, a spring 18 is attached to the middle part of this mounting bolt 16.
is a compression coil spring whose upper end is housed in a large diameter hole 38 in the lowermost flat plate 2 of the upper mold 12 and is supported around the bolt mounting hole 39 of the flat plate 22, and its lower end is housed in the large diameter hole 38 in the lowermost flat plate 1 of the upper mold 12.
7 flat plates stacked on top of 4. Large diameter hole 3.
8 and is abutted around the bolt attachment hole 39 of the flat plate 60.

The mold configured in this way has a spring 18 when not in use.
The upper and lower molds 12 and 14 are separated from each other due to the urging force of
As a result, the shearing blades 50 of the punches 26, 28 and the die 6
The two shear teeth 72 are spaced apart from each other.

Next, the key 76 is inserted into the uneven key insertion area formed by the key insertion groove 66 of the die 62 and the key insertion groove 84 of the flat plate 20 in the lower mold 14 (FIG. 1).

If the upper mold 12 is pushed down in the direction of the lower mold 14 against the biasing force of the spring 18, the foot portions 48 of the shearing blades 50 of the punches 26 and 28 will enter into the punch relief grooves 68 and 72 of the die 62. At the same time, the shearing blades 50, 72, and 74 work together to shear a portion of the key 76 to form a predetermined key mountain.

At the same time, the key 32 engraves a predetermined number on the key 76. When the pressing force on the upper mold 12 is released, the upper mold 12 returns to the state shown in FIGS. 2 and 3 due to the biasing force of the spring 18, and when the key 76 is pulled out, the machining of the key 76 is completed. In addition,
It goes without saying that this mold 10 can be provided with guide posts fixed to the upper mold 12 or the lower mold 14.

It is also clear that the combination of the flat plates shown in this embodiment can be changed as appropriate, and the means for fixing the flat plates is not limited to pins.

Since the present invention uses the above-mentioned horizontal formation, only the punch and die having shear blades are formed by cutting and polishing, and each flat plate can be created by press punching, and the manufacturing period is extremely short.
It is possible to provide a mold that is significantly cheaper than conventional molds (approximately 1/5 to 1'10 of the price of conventional molds),
It has the excellent effect of efficiently completing high-variety, low-volume production.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a mold according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a sectional view taken along line m-m in Fig. 1, and Figs.
The figure is a plan view showing the flat plate, FIG. 7 is a perspective view showing the punch,
FIG. 8 is a plan view showing another flat plate, FIG. 9 is a perspective view showing the die, and FIGS. 10A to 10E are perspective views showing the mold assembly procedure. 10... Mold, 12... Upper mold, 14.
...Lower mold, 16...Mounting bolt, 18...Spring, 20,22,24...Flat plate, 26,28...
... Punch, 50 ... Shear blade, 60 ...
Flat plate, 62... Yuri, 72, 74... Shearing blade. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A die receiving part formed by stacking punched flat plates and fixing them to each other, and forming a die holding hole opened at one end in the middle layer flat plate, and a shearing plate inserted and fixed into the die holding hole in this die receiving part. A die having a blade, a punch receiving part formed by laminating a punched flat plate and fixing each other, and having a punch hole formed therethrough and a punch stopper plate hole formed in the middle layer flat plate, and the punch receiving part. A punch fixed to the die receiving part and the punch receiving part through a stopper plate and having an end protruding from the punch receiving part, and a spring for separating the die receiving part and the punch receiving part from each other, the die receiving part and the punch receiving part. A press die that shears the press material with the shear blades of the die and punch by bringing the die and punch closer together.