JPH06226375A - Turret punch press - Google Patents

Abstract

PURPOSE:To improve the punching precision by enlarging one side slot of an upper part turret in a die changing position, narrowing a holder attaching hole of a machining position side, and punching. CONSTITUTION:In a time punching or changing a die, a fitting recessing part of a shot pin 56 is pushed against a shot pin fitting projecting part of an end surface of a machining position PT side of an upper part turret 49 by operating a shot pin cylinder 54 and fitted. In such a way, the projecting part is closed with pushing by only a slot G portion, a diameter of a holder attaching hole 50 positioning at the machining position PT is made small, the state strongly tightening the punch holder is made and the punching is made so as to be executed. At the same time, the slot G of the part of the holder attaching hole 50 positioning at the die changing position AT of the reverse side to the machining position PT is enlarged with an elasticity of the upper part turret 49 itself, and the hole 50 is also enlarged in a few. The tightening of the punch holder attached on the above is loosened, and the changing is easily operated.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a turret punch press.

[0002]

2. Description of the Related Art A conventionally known turret punch press has a rotatable disc-shaped upper turret, which removably supports a punch, and a die, which cooperates with the punch to process a plate material. A rotatable disc-shaped lower turret supported, a vertically movable striker that presses the punch indexed at the processing position, and a plate material processed by the punch and die supported on a work table X, Y
And a plate material moving and positioning device that is movable and positionable in the axial direction. Then, a plurality of punches mounted on each of the upper and lower turrets, a required set of punches and dies from the dies are selected to perform punching of various shapes and sizes on the plate material.

However, in such a conventional turret punch press, the number of punches and dies mounted on the upper and lower turrets is naturally limited by the size of the upper and lower turrets.

Therefore, a turret punch press with a so-called mold exchanging device (ATC) in which a tool magazine and a die exchanging device are arranged adjacent to the turret punch press is also used. As the ATC of the turret punch press with the ATC, various types such as a rotary tool magazine, a rotary front-rear moving type, and a cylindrical coordinate type robot system are known.

By the way, in such a turret punch press with an ATC, a mold exchanging device is arranged adjacent to the punch press main body, and a tool magazine is arranged on the side opposite to the punch press main body in the mold exchanging device. It is common to have

[0006] In such a case, the mold exchanging device clamps the mold holder mounted with the mold in the tool magazine and moves it to the mold exchanging position near the turret, and this mold holder is mounted on the punch press main body. It is common to follow the mold replacement procedure for mounting the turret in the mounting hole. Therefore, there is a problem that it takes a lot of time for setup and die replacement, and is not suitable for machining which requires frequent die replacement such as machining of products of high-mix low-volume production.

[0007]

Therefore, the applicant of the present invention, in Japanese Patent Application No. 3-301806, newly arranged a tool magazine horizontally on a sub-frame adjacent to the punch press main body, and produced a wide variety of products in a small amount and was flexible. We have proposed a turret punch press that can be used for highly automated processes.

An object of the present invention is to provide a turret punch press capable of reliably tightening a punch holder in such a turret punch press and further improving punching accuracy.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a punch holder is detachably mounted in holder mounting holes formed at one end of an upper turret and at an end on the opposite side of the rotary shaft. A die holder is removably attached to holder mounting holes formed at one end of the turret and at the opposite end across the rotary shaft, and the die holder is rotated 180 ° from the machining position directly below the striker. The upper and lower turrets can be rotated by 180 ° synchronously with the die exchange position, punching is performed by a set of a punch and a die located at the machining position, and a magazine type metal mold is used at the die exchange position. A punch holder attached to the holder attachment hole of the upper turret and a die holder attached to the holder attachment hole of the lower turret by a die exchanging device are installed in an appropriate set. In a turret punch press that is automatically replaced with one, at least in each of the holder mounting holes on both sides of the upper turret, if one is narrowed by an external force, the other expands, or if one is expanded by an external force, the other narrows. Means for forming a slit that can affect each other are provided with means for widening one slot of the upper turret at the mold replacement position, or means for narrowing one slot of the upper turret at the processing position. .

[0010]

In the turret punch press of the present invention, the holder mounting holes on both sides of the upper turret are affected by each other so that if one is narrowed by an external force, the other is widened, or if one is widened by an external force, the other is narrowed. Forming a slit that fits, and providing a means to widen one of the slits of the upper turret at the mold replacement position,
Alternatively, when one end of the upper turret is placed in the processing position by providing a means for narrowing one slot of the upper turret in the processing position, and the other end is punched in the mold exchange position, the upper turret is in the mold exchange position. By mounting the holder on the end of the upper turret on the mold replacement position side by expanding the slot by means of expanding one slot of the upper turret or by narrowing the slot by means of narrowing one slot of the upper turret at the processing position. By expanding the hole to facilitate the replacement of the punch holder, conversely narrowing the holder mounting hole at the end on the processing position side and tightly tightening the punch holder to perform punch processing,
The processing accuracy can be increased.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Referring to FIGS. 1, 2 and 3, the turret punch press 1 is provided with a common base 3, and a gate-shaped main body frame 5 is erected on the common base 3. The body frame 5 is composed of an upper frame 5U having an opening 7 and a lower frame 5D. A disk support 9 that receives the force of the press is provided at the processing position on the lower frame 5D.

The upper frame 5U of the main body frame 5 is provided with a hydraulic cylinder for moving the ram 11 up and down, or a drive device 13 including crank drive or servo drive. A striker 15 is provided below the ram 11. Moreover, the ram 11 is slidably slid in the Z-axis direction (vertical direction in FIGS. 1 and 2) by being guided by the ram guide member 17 attached to the upper frame 5U.

With the above structure, when the driving device 13 is driven, the ram 11 is guided by the ram guide member 17 and Z
Since it moves in the axial direction, the striker 15 is moved up and down.

A plurality of brackets 19 are attached to the lower frame 5D of the main body frame 5 extending in the Z-axis direction at appropriate intervals in the Y-axis direction (left-right direction in FIGS. 2 and 3). A support frame 21 is provided on the plurality of brackets 19. A work table 25 is attached to each of the support frames 21 via a plurality of balls 23.
The side table 25S is provided so as to be movable in the Y-axis direction. The work table 25 has side tables 25S on both sides of a fixed center table 25C.

On the left side of the work table 25 in FIG. 3, a carriage base 29 of the plate material movement positioning device 27 is provided. This carriage base 2
A rotatable ball screw 31 extending in the X-axis direction (horizontal direction in FIG. 1, vertical direction in FIG. 3) is supported on the shaft 9. The ball screw 31 is provided with a carriage 33 which is movable in the X-axis sail direction via a nut member. Moreover, the carriage 33 is provided with a plurality of work clamps 35 for clamping the plate material W.

An X-axis motor 37 is provided below the carriage base 29 as shown in FIG. 3, and a drive pulley 39 is attached to the output shaft of the X-axis motor 37. On the other hand, a driven pulley 41 is attached to one end of the ball screw 31, and a timing belt 43 is wound around the driven pulley 41 and the drive pulley 39.

With the above structure, when a Y-axis drive motor (not shown) is driven, the side table 25S is moved in the Y-axis direction via the carriage base 29 and the balls 23 supported by the support frame 21. It will be.
When the X-axis drive motor 37 is driven, the ball screw 31 is rotated via the drive pulley 39, the timing belt 43, and the driven pulley 41, so that the carriage 33 moves in the X-axis direction via the nut member. Will be done. Therefore, the plate material W clamped by the work clamp 35 is moved in the X and Y axis directions, and the desired position of the plate material W is positioned at the processing position below the striker 15.

A sub-frame 45 adjacent to the body frame 5 is erected on the common base 3. The sub frame 45 is an upper frame 45U and a lower frame 45.
It has a C-shaped structure made of D. An upper turret 49, which is, for example, a rectangular parallelepiped and is rotatable below the upper frame 45U via an upper rotating shaft 47U, and an upper turret 49 is rotatable above the lower frame 45D via the lower rotating shaft 47D. The lower turrets 51 each having a rectangular shape are supported.

Punches P are provided on both sides of the upper turret 49.
The punch holder PH in which the die D is attached is detachably attached, and the die holder DH in which the die D is attached at a position corresponding to the punch P is detachably attached on both sides of the lower turret 51. Moreover, inside the upper and lower frames 45U and 45D, for example, a fluid cylinder 5 as a rotation driving means for rotating the left and right sides in FIG. 2, that is, the upper and lower rotation shafts 47U and 47D in FIG.
3U, 53D; 55U; 55D are provided, and racks 61U, 61D; 63U, 63D are integrated at the tips of piston rods 57U, 57D; 59U, 59D mounted on the fluid cylinders 53U, 53D; 55U, 55D. Is provided for the purpose. This rack 61U, 61D; 63
Pinions 65 and 67 fitted to the upper and lower rotating shafts 47U and 47D are meshed with the U and 63D.

With the above structure, the fluid cylinders 53U, 5U
3D; 55U, 55D are actuated, the piston rods 57U, 57D; 59U, 59D are moved in the left-right direction in FIG. 4, so racks 61U, 61D;
The upper and lower rotary shafts 47U and 47D are synchronously rotated in the same direction via the U and 63D and the pinions 65 and 67, respectively. Therefore, the structure is simple and
The lower turrets 49, 51 can be rotated at high speed and can be manufactured at low cost. As the rotation driving means, the drive motor, worm, and worm wheel may rotate the upper and lower rotary shafts 47U and 47D.

As shown in FIG. 5, a side portion of the lower turret 51 is provided with a semi-arcuate auxiliary table 71 having a support member 69 such as a brush for supporting the plate material W. Therefore, the downward forming process can be performed, and the scratches generated on the plate material W during the rotation of the lower turret 51 can be reduced.

With the above structure, the upper and lower rotary shafts 47U,
By the rotation of 47D, the upper and lower turrets 49 and 51 are indexed, and the selected punch P and die D are positioned at the processing position. Then, as the striker 15 moves up and down, the punch P and the die D cooperate with each other to punch the plate W at a desired position.

Adjacent to the left side of the upper and lower frames 45U and 45D of the sub-frame 45 in FIG. 1, a punch holder magazine 73 for supporting a punch P to be detachably attached to the upper turret 49 and a lower turret. 51
And a die holder magazine 75 supporting a die D to be attached / detached and replaced. The upper turret 49
As shown in FIG. 1, the punch attaching / detaching / changing position PT is located below the punch holder magazine 73, and the die attaching / detaching / changing position DT of the lower turret 51 is also shown in FIG. On the die exchanging device 77 so as to be located above the die holder magazine 75,
Lower die exchanging devices 77U and 77D are arranged in the vertical direction of the punch and die exchanging positions PT and DT.

The punch and die holder magazines 73, 7
5 are arranged to face each other in the vertical direction, and as shown in FIG. 3, endless chain members 79 and 81 are wound around a drive sprocket 83 and a driven sprocket 85. Drive motors 87 and 89 such as servo motors are interlocked with the drive sprocket 83. Plural endless clamp claws 91 and 93 for clamping the punches and die holders PH and DH are attached to the chain members 79 and 81 so as to face each other.

Chuck pawls 95 and 97 for clamping the punch and die holders PH and DH are provided below the upper and lower mold exchanging devices 77U and 77D. The upper and lower mold exchanging devices 77U, 7 are driven by drive motors 99, 101 for changers such as servomotors mounted on the upper and lower frames 45U, 45D of the sub-frame 45.
7D can be moved up and down.

With the above structure, while punching the plate W by the cooperation of the punch P and the die D at the working position, at the punch / die attaching / detaching / changing positions PT, DT,
The upper and lower mold exchanging devices 77U, 77D are driven by the drive motor 99,
By moving up and down by 101, upper and lower turrets 49,
The punch and die holders PH and DH mounted on 51 are taken out by the chuck claws 95 and 97, and mounted on the punch and die holder magazines 73 and 75. Next, the punches, the die holders PH, DH are chucked by the clamp claws 91, 93 of the punch, die holder magazines 73, 75.
It is taken out at 7, and attached to the upper and lower turrets 49 and 51. By performing this series of operations, the upper and lower mold exchanging devices 77U, between the punch / die attaching / detaching / changing positions PT, DT and the punch / die holder magazines 73, 75,
The punch and die holders PH and DH can be directly exchanged by the linear movement of the 77D in the vertical direction.

The punch and die holder magazines 73 and 7
In the exchange position of 5, as shown in FIGS. 2 and 3,
An ordinary mold exchanging device 103 having two known arms and a tooling tower 105 are arranged. This mold exchanging device 103 has clamp arms 109 attached to the ends of two arms 107 and can rotate 90 and 180 degrees. Since the structure is already known, detailed description will be omitted. . Further, the tooling tower 105 is also provided with clamp claws 113 in a plurality of steps on the outer periphery of the cylindrical member 111, and punches, die holder PH,
DH is clamped. The cylindrical member 111 is rotatable and vertically movable. That is, the cylindrical member 111 is moved up and down by the operation of the fluid cylinder 115, and the driving pulley 1 is driven by the servo motor 117.
It is configured to be rotated via 19, a timing belt 121, and a driven pulley 123. Therefore, the punch and die holder magazines 73 and 75 and the tooling tower 1
The punch and die holders PH and DH are exchanged with the die exchanging device 103.

The turret punch press 1 having such a structure
In particular, the structure of the upper turret, which is a feature of the present invention, will be described below. As shown in FIG. 7 and FIG. 8, the upper turret 49 for mounting the punch mold is
It is divided into two parts, a half 49a and a second half 49b.
The half body 49a is fixed to the turret rotation shaft 47U, and when the turret rotation shaft 47U is rotated by the turret drive 46, the first half body 49a is also rotated at the same time. The second half body 47b is fitted to the turret rotation shaft 47U by a loose fit so that it can freely rotate around the turret rotation shaft 47U.

Semi-circular mounting holes 50a and 50b for punch holders are formed on opposite sides of the first half body 49a and the second half body 49b, respectively. The punch holder mounting hole 50 is formed. In addition, a spring 48 is incorporated between the facing surfaces of the first and second halves 49a and 49b, which face each other, so that a gap that is always a slight slot G is formed between the halves 49a and 49b. There is. In addition, a semi-conical recess 52 is formed in a portion of the side ends of each of the half bodies 49a and 49b that face each other.
a, 52b are formed, and these recesses 52a, 52a,
By combining 52b, a substantially truncated cone-shaped shot pin receiving recess 52 is formed.

On the other hand, the die replacement position A of the upper turret 49
A shot pin cylinder 54 is appropriately attached to a fixed member on the side of the T side, and a truncated cone-shaped tip of a shot pin 56 driven by this shot pin cylinder 54 is for receiving the above-mentioned shot pin. It is adapted to be press-fitted into the recess 52.

Therefore, now, the shot pin cylinder 5
4 is pressed to press the truncated cone-shaped tip of the shot pin 56 into the shot pin receiving recess 52 on the mold exchange position AT side, so that the inner diameter of the recess 52 is slightly widened, whereby the turret rotation shaft 47U. The first and second halves 49a and 49b rotate slightly in opposite directions with respect to. Therefore, the gap of the slot G on the mold exchange position AT side of the turret rotation shaft 47U is widened, and the gap of the slot G on the machining position PT side of the turret rotation shaft 47U is narrowed. As a result, The diameter of the holder mounting hole 50 on the side of the die replacement position AT is widened so that the punch holder P
The tightening with respect to H becomes loose and the replacement becomes easy, and conversely, the diameter of the holder mounting hole 50 on the processing position PT side is narrowed so that the punch holder PH can be strongly tightened, and the punch holder PH can be fixed at the processing position. It becomes stronger and the processing accuracy can be improved.

When punching is completed and the die needs to be replaced, the shot pin cylinder 54 is driven in the original direction to pull out the shot pin 56 from the recess 52, and the upper turret 49 is rotated by the turret rotation shaft. Freely rotate around 47U and rotate 180 ° so that the punch die on the side that had been at the processing position PT until then comes to the die exchange position AT side, and in the same way as the shot pin cylinder. By operating 54, the die can be easily replaced and punching can be performed accurately.

FIG. 8 shows another embodiment of the present invention. By directly slotting the holder mounting holes 50 on both sides of the upper turret 49, the die replacement position AT is obtained.
In, the shot pin cylinder 54 is actuated to press the shot pin 56 into the shot pin receiving recess 52 to widen the gap of the slot G on the die replacement position AT side and utilize the self-elasticity of the metal on the opposite side. Processing position P
At T, the gap of the slot G is narrowed.

FIG. 9 shows still another embodiment of the present invention, in which the holder mounting holes 5 on both sides of the upper turret 49 are provided.
Each slot 0 has a slot G extending to the end face portion thereof, and further, a truncated cone-shaped convex portion 58 for fitting a shot pin having the slot G on each end face. Then, the shot pin cylinder 54 is fixed to an appropriate fixing member on the processing position PT side of the upper turret 49, and the above-mentioned shot pin fitting convex portion 58 is provided at the tip of the shot pin 56 driven by this shot pin cylinder 54.
A fitting recess 56a having an inner diameter slightly smaller than that of the fitting recess 56a is formed.

Therefore, during punching or die replacement, the shot pin cylinder 54 is actuated to engage the shot pin fitting projection 58 on the end surface of the upper turret 49 on the working position PT side with the shot pin fitting recess 58. 56a is pressed and fitted, whereby the convex portion 5
8 is pushed by the amount corresponding to the slot G, whereby the diameter of the holder mounting hole 50 located at the processing position PT is reduced, and the punch holder PH is strongly tightened so that punching processing can be performed. At the same time, due to the elasticity of the upper turret 49 itself, the processing position PT
The slot G of the holder mounting hole 50 located at the mold exchange position AT on the opposite side of the mold is widened,
The diameter of the holder attachment hole 50 also becomes slightly wider, and the punch holder PH attached thereto is loosened to facilitate replacement.

10 and 11 show another embodiment of the present invention. In this embodiment, a slot G communicating with the side surface is formed in each of the holder mounting holes 50 on both sides of the upper turret 49, and a hydraulic cylinder 60 is attached to one side of the slot G and the other portions of the slot G are attached. The piston rod 62 driven by the hydraulic cylinder 60 is embedded in the side, and the piston rod 62 is attracted by the driving of the hydraulic cylinder 60 to narrow the gap of the slot G, and as a result, reduce the diameter of the holder mounting hole 50. The punch holder PH inside is tightened. Therefore, the inner diameter of the holder mounting hole 50 when the hydraulic cylinder 60 is not operated is slightly larger than the outer diameter of the punch holder PH so that the punch holder PH is loosely supported at the die replacement position AT.

Plunger embedding recesses 64 are formed on both end surfaces of the upper turret 49, and hydraulic chambers 66 are formed in the recesses 64, and shot pin bushes 68 are further embedded. The hydraulic chambers 66 are connected to the hydraulic cylinders 60 of the slot G located at a position farther than the turret rotation shaft 47U (that is, on the opposite side) by hydraulic pipes 70. And each hydraulic chamber 6
A hydraulic plunger 72 is housed inside 6, and the end of this hydraulic plunger 72 is projected toward the bush 68.

An air pressure type shot pin cylinder 74 is attached to a suitable fixing member on the side of the end of the upper turret 49 on the side of the mold replacement position AT. This shot pin cylinder 74 has a double structure, and the upper turret 4
Positioning of 9 at the mold change position AT (and therefore also
A tool for driving the tool holder clamp pin 78 for penetrating the inside of the shot pin 76 and pressing the tip portion of the hydraulic plunger 72 together with the shot pin cylinder 74 for performing the positioning to the processing position PT). A holder clamp cylinder 80 is provided.

In the turret punch press having the above structure, the upper turret 49 is moved to 1 when punching of the plate material is completed.
The shot pin 76 is rotated by 80 ° and the shot pin 76 is the shot pin bush 64 on the end surface of the upper turret 49 on the mold exchange position AT side.
And mate to position. The punch holder PH that has come to the die replacement position AT has a holder mounting hole 50.
Since it is only loosely fitted to the mold, it can be easily replaced by the mold changing device.

At the same time, the tool holder clamp cylinder 80 is also driven, and the tool holder clamp pin 78 is driven.
Is pushed toward the hydraulic plunger 72 side to push the hydraulic plunger 72 into the hydraulic chamber 66. As a result, the oil in the hydraulic chamber 66 flows into the hydraulic cylinder 60 located at the processing position PT through the hydraulic pipe 70, whereby the hydraulic piston 62 is pulled toward the hydraulic cylinder 60 side.
This movement of the hydraulic piston 62 exerts a force to narrow the gap of the slot G, and as a result, the diameter of the holder mounting hole 50 at the processing position PT is reduced and the punch holder PH is strongly tightened, so that punching can be performed with high accuracy. Like

When operating the mold exchanging device,
Since punching is stopped, the tool holder clamp pin 78 is pulled into the shot pin 76 by releasing the operation of the tool holder clamp cylinder 80. By doing so, the punch holder PH can be easily removed from the holder mounting hole 50.

[0043]

As described above, according to the present invention, in each of the holder mounting holes on both sides of the upper turret, if one is narrowed by an external force, the other is widened, or if one is widened by an external force, the other is narrowed. To form a slot that can affect each other, and to provide a means to widen one slot of the upper turret at the mold replacement position,
Alternatively, since a means for narrowing one slot of the upper turret at the processing position is provided, when one end of the upper turret is placed at the processing position and the other end is subjected to punching processing at the mold replacement position, at the mold replacement position. By expanding the slot by means of expanding one slot of the upper turret, or by narrowing the slot by means of narrowing one slot of the upper turret at the processing position, the end of the upper turret on the mold exchange position side The holder mounting hole can be widened to facilitate punch holder replacement, and conversely, the holder mounting hole at the end on the processing position side can be narrowed to tightly tighten the punch holder for punching, which improves processing accuracy. be able to.

[Brief description of drawings]

FIG. 1 is a right side view of a turret punch press according to an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is an enlarged view taken along line IV-IV in FIG.

5 is an enlarged view of a V arrow portion in FIG.

FIG. 6 is an enlarged plan view showing a portion of an upper turret of one embodiment of the present invention.

FIG. 7 is a front view of FIG.

FIG. 8 is an enlarged plan view showing a portion of an upper turret of another embodiment of the present invention.

FIG. 9 is an enlarged plan view showing a portion of an upper turret of still another embodiment of the present invention.

FIG. 10 is a partially cutaway plan enlarged view showing a portion of an upper turret of still another embodiment of the present invention.

11 is an enlarged cross-sectional view of a portion A in FIG.

[Explanation of symbols]

 1 Turret Punch Press 5 Body Frame 5U Upper Frame 5D Lower Frame 11 Ram 15 Striker 25 Work Table 27 Plate Material Moving Positioning Device 35 Work Clamp 45 Sub Frame 45U Upper Frame 45D Lower Frame 47U Turret Rotating Shaft 49 Upper Turret 49a First Half 49b Second half 50 Holder mounting hole 50a Half hole 50b Half hole 51 Lower turret 52 Recesses 52a, 52b Semi-conical recess 54 Shot pin cylinder 56 Shot pin 56a Fitting recess 58 Shot pin fitting projection 60 Hydraulic cylinder 62 Piston rod 64 Plunger Embedding Recesses 66 Hydraulic Chamber 68 Bushing 70 Hydraulic Piping 71 Auxiliary Table 72 Hydraulic Plunger 73 Punch Holder Magazine 74 Shot Pin Cylinder 7 Die holder magazine 76 shot pin 77 mold changing device 77U upper die exchanging device 77D under die exchanging device 78 tool holder clamp pin 80 tool holder clamp cylinder G slotted AT die exchange position PT machining position PH punch holder DH die holder

Claims (1)

[Claims] 1. A punch holder is detachably attached to holder mounting holes formed at one end of an upper turret and at an end opposite to the rotary shaft, and one end of a lower turret and its rotary shaft are attached. A die holder is detachably attached to the holder mounting holes formed at the opposite ends of the die and the die is rotated 180 ° from the machining position directly below the striker and from this machining position around the turret rotation axis. The upper and lower turrets can be synchronously rotated by 180 ° with respect to the exchange position, punching is performed by a set of the punch and the die located at the processing position, and at the mold exchange position, the magazine type is used. A punch holder mounted in the holder mounting hole of the upper turret and a die holder mounted in the holder mounting hole of the lower turret by a mold exchanging device. In a turret punch press that automatically replaces and with an appropriate set, at least in each of the holder mounting holes on both sides of the upper turret, if one is narrowed by an external force, the other expands, or one is expanded by an external force. A slot is formed to such an extent that they can influence each other so as to narrow the other when expanded, and a means for expanding one slot of the upper turret at the mold exchange position is provided, or one of the upper turret at the processing position is formed. A turret punch press, characterized in that it is provided with means for narrowing the slot.