JPH071222Y2 - Shear type for blank press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a shearing die used in a blank press.

(Prior Art) Conventionally, a blank W (flat sheet metal) as shown in FIG.
A blank press is known as an apparatus for shearing at a position indicated by a chain line to continuously manufacture a large number of trapezoidal parts Wa.

The simplest example of a blank press is shown in FIGS. 5 and 6.

This hydraulic single-acting blank press includes a lower blade plate 4 having a lower blade 3 fixed to an upper surface 2a of a holder 2 fixed to a bolster 1, and a lower blade plate 4 having a lower surface 5a of a ram 5. On the other hand, a shearing die 9 is formed with the upper blade plate 8 to which the upper blade 7 is fixed so as to be vertically movable by a plurality of guide stays 6, and the lower blade plate 4 of the shearing die 9 is formed. The blank W is inserted between the upper blade plate 8 and the upper blade plate 8, and the ram 5 is hydraulically moved up and down with respect to the bolster 1, whereby the blank W is sheared by the lower blade 3 and the upper blade 7, and the component Wa Is configured to manufacture.

(Problems to be solved by the invention) By the way, parts manufactured by the blank press described above.
When the pitch Pa of Wa (FIG. 4) and the angle θa formed by the side surface of the blank W and the shear plane are changed to manufacture the part Wb composed of the pit Pb and the angle θb as shown in FIG. 7, As the simplest method, as shown by a broken line in FIG. 6, the position of the lower blade 3 fixed to the lower blade plate 4 of the shearing die 9 and the position of the upper blade 7 fixed to the upper blade plate 8 (see FIG. (Not shown) may be changed according to the pitch Pb and the angle θb of the component Wb. However, in this method, since the positions of the lower blade 3 and the upper blade 7 are individually changed,
It is necessary to readjust the alignment of the lower blade 3 and the upper blade 7. As is well known, the alignment of the lower blade 3 and the upper blade 7 is the most important work in the shearing die 9, and its adjustment requires a high level of skill and experience. Therefore, this method has a drawback that the time loss and the work cost are significantly increased.

Therefore, when changing the pitch or angle as described above in the blank press, the shearing die 9 having different pitches or angles between the lower blade 3 and the upper blade 7 is usually used depending on the shape of the component to be manufactured.
Was produced one by one for each part, and the shearing mold 9 was exchanged according to the specifications of the part to be manufactured.

However, since this type of conventional blank press shearing die 9 is extremely heavy, its replacement requires a large-scale facility such as a crane, and has a problem that it requires a great deal of labor and working time. .

(Means for Solving the Problem) In order to solve the above-mentioned problems, the present invention relates to the shearing die for blank press, wherein the lower blade plate and the upper blade plate are attached to the holder and the ram, and plate fixing means is provided. While detachably and slidably fixed via the air blower, an air blowout hole is formed in the contact surface of the lower blade plate with the holder, and an air supply port communicating with the air blowout hole is formed in the wall portion of the lower blade plate. Is formed, and air having a pressure for floating the lower blade plate from the upper surface of the holder is supplied to the air supply port by the air supply means.

(Operation) According to the present invention, the air is supplied from the air supply means to the air supply port in a state where the fixation of the plate fixing means to the lower blade plate and the upper blade plate is released. High-pressure air is jetted onto the upper surface of the holder, an air curtain is formed between the upper surface of the holder and the lower surface of the lower blade plate, and the lower blade plate is floated from the upper surface of the holder.

(Example) FIG. 1 shows an example of a shearing die for blank press according to the present invention in a hydraulic double-acting blank press.

This blank press shearing die 9 includes a lower blade 3, a lower blade plate 4, a guide stay 6, an upper blade 7, and an upper blade plate 8.
Etc.

The lower blade 3, as shown in FIGS. 1 and 2, is a bolt 3a.
It is fixed in place on the lower blade plate 4. On the other hand, the upper blade 7 is fixed at a fixed position on the upper blade plate 8 by a bolt 7a. Here, the positions of the lower blade 3 and the upper blade 7 are precisely adjusted in advance. Also, the upper blade plate 8
Is a plurality of guide stays 6 with respect to the lower blade plate 4.
(See FIG. 2) and are arranged so as to be vertically movable so as to face each other. Each guide stay 6 is fixed to an upper blade plate 8 and is slidably supported by an oil-impregnated guide piece 6a arranged on the lower blade plate 4 in a direction orthogonal to the paper surface in FIG. There is.

Further, at a portion of the upper blade plate 8 facing the lower blade 3, a blank holder 10 for pressing the blank W against the lower blade 3 when the blank W is sheared is a damper 11 made of urethane.
It is arranged via. Further, a blank receiver 12 for receiving the component Wa sheared from the blank W is arranged below the upper blade 7.

The lower blade plate 4 is a holder 2 fixed on the bolster 1.
It is disposed on the upper surface 2a of the above so as to be detachable and slidable. That is, the lower blade plate 4 is fixed to the upper surface 2a of the holder by a plate consisting of a plate fixing bracket 13 formed in an L-shaped cross section and a tightening bolt 14 for fastening the plate fixing bracket 13 to the holder 2. By the fixing means 15,
This is performed by fixing the base end portion 4a of the lower blade plate 4 and tightening the plate fixing bolt 16 arranged in the holder 2 through the long hole 4b formed in the base end portion 4a of the lower blade plate 4. On the other hand, similarly to the lower blade plate 4, the upper blade plate 8 is fixed to the lower surface 5a of the ram 5 by the plate fixing means 15 including the plate fixing fitting 13 and the tightening bolt 14. Here, the plate fixing bolt 16 is, as shown in FIG. 3, a guide groove 2b formed along the feed direction of the blank W on the upper surface 2a of the holder 2.
Is slidably fitted in. Also, the lower blade plate 4
Like the plate fixing bolt 16, the tightening bolt 14 of the plate fixing means 15 is slidably fitted in another guide groove 2c formed on the upper surface 2a of the holder 2. On the other hand, a tightening bolt for the plate fixing means 15 of the upper blade plate 8.
14 is the above-mentioned guide groove 2c formed on the lower surface 5a of the ram 5.
A guide groove 5c similar to the above is slidably fitted.

An air outlet 4c is formed on the contact surface of the lower blade plate 4 with the holder 2 (the lower surface of the lower blade plate) (see FIG. 1). The air outlet 4c communicates with an air supply port 4d formed in the wall of the lower blade plate 4.
An air pipe for supplying high-pressure air from the air supply means 17 (compressor) arranged on the lower blade plate 4 (other parts may be used) is connected to the air supply port 4d. Here, the air sent from the air supply means 17 to the air supply port 4d is supplied from the air outlet 4c to the upper surface 2a of the holder 2.
Is ejected toward the upper surface 2a of the holder 2
And the lower surface of the lower blade plate 4 has sufficient pressure to form an air curtain.

That is, in the blank press shearing die 9 configured as described above, in FIG. 1, the tightening bolts 14 and the plate fixing bolts 16 are loosened, and the holder 2 of the lower blade plate 4 and the la upper blade plate 8 is held. , And the ram 5 are released, the air supply means 17 is operated, and high-pressure air is jetted from the air outlets to the upper surface 2a of the holder 2 through the air supply port 4d.
An air curtain is formed between the upper surface 2a of the holder 2 and the lower surface of the lower blade plate 4, and the lower blade plate 4 can be slightly floated above the upper surface 2a of the holder 2 by this air curtain.

Therefore, as described above, when the specifications (pitch Pa, angle θ, etc.) of the components Wa sheared from the blank 7W are set to different values, as described above, the upper blade 2a of the holder 2 is moved to the lower blade plate 4a. As the surface of the lower blade 4
Can be moved to a desired position, and the pitch and angle of the lower blade 3 with respect to the blank W can be easily changed in a short time. At this time, since the upper blade plate 8 is substantially integrated with the lower blade plate 4 by the guide stay 6, the movement of the lower blade plate 4 aims at the positional relationship between the lower blade 3 and the upper blade 7. It never happens.

Here, in order to control the blind movement of the lower blade plate 4 on the upper surface 2a of the holder 2, as shown in FIG. The gauge hole 2d may be drilled, the gauge hole 4a may be drilled in the base end portion 4a of the lower blade plate 4, and the positioning gauge pin 18 may be inserted into the reference hole 4e and the gauge hole 2d. With this structure, when the lower blade plate 4 is moved with respect to the holder 2,
It is possible to know in advance whether a blank part having a desired pitch and angle can be obtained, and the plate fixing bolt 16 is damaged by the abrupt movement of the lower blade plate 4 and the shearing die 9 is used.
Can be prevented from falling off the holder 2.

(Advantages of the Invention) According to the present invention, the pitch and angle of the shearing type lower and upper blades for blank press can be changed easily and in a short time without providing large-scale equipment.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a plan view of the lower mold in the above embodiment, FIG. 3 is a sectional view taken along the line XX of FIG. 2, and FIG. FIG. 5 is a plan view of a blank part to be manufactured, FIG. 5 is a schematic side view of a conventional shearing die for blank press, FIG. 6 is a sectional view taken along line YY of FIG. 5, and FIG. 7 is manufactured by the above embodiment. It is a top view of other blank parts. 1 ... Bolster, 2 ... Holder, 2a ... Upper surface of holder 2, 2b, 2c ... Guide groove, 3 ... Lower blade, 4 ... Lower blade plate, 4b ... Oblong hole, 4c. Hole, 4d ... Air supply port, 5 ... Ram, 5a ... Lower surface of ram 5, 6 ... Guide stay, 7 ... Upper blade, 8 ... Upper blade plate, 9 ... Shear type for blank press, 15 …… Plate fixing means, 16 ……
Plate fixing bolt, 17 ... Air supply means.

Claims (1)

[Scope of utility model registration request] 1. A lower blade plate having a lower blade fixed to an upper surface of a holder fixed to a bolster of a press, and a plurality of guide stays fixed to a lower surface of a ram and provided to the lower blade plate. In a shearing type for blank press consisting of an upper blade plate with fixed upper blades arranged to face each other in a vertically movable manner, the lower blade plate and the upper blade plate are attached to and detached from and slid on the holder and the ram. A plate fixing means for freely fixing, an air blowing hole formed in a contact surface of the lower blade plate with the holder, and an air supply formed in a wall portion of the lower blade plate in communication with the air blowing hole. Shear for blank press comprising an opening and an air supply means for supplying air having a pressure for floating the lower blade plate from the upper surface of the holder to the air supply opening. .