JPH054902Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a press working device for cylindrical workpieces.

2. Description of the Related Art Holes are formed in the circumferential wall of a cylindrical workpiece such as a pipe by using a machine such as a drill or a milling machine.

Problems to be Solved by the Invention In the aforementioned machining process, cutting is performed over time using a cutting tool such as a drill or end mill, which requires a lot of labor and time. Moreover, fine chips are scattered and it takes time to dispose of them.

For this reason, for example, Japanese Unexamined Patent Application Publication No. 51-89 discloses a method of making holes in the peripheral wall of a cylindrical workpiece by press working. However, in this press working method, only a hole is formed in the peripheral wall of the cylindrical workpiece using a punch, and when inserting the die into the cylindrical workpiece, the axis of the cylindrical workpiece and the longitudinal axis of the die are aligned. It is not designed to mechanically maintain the alignment of the cylindrical workpiece or to mechanically position the cylindrical workpiece in the axial direction. For this reason, it takes time and effort to position the cylindrical workpiece in the axial direction during press working, making it difficult to suddenly adopt it for automation of press working.

Therefore, in the present invention, below the punch, in the press processing device, the alignment of the axis of the cylindrical workpiece and the longitudinal axis of the die, and the axial positioning of the cylindrical workpiece by lowering the ram. The objective is to automatically punch out holes at predetermined positions on the circumferential wall of a cylindrical workpiece.

Means for Solving the Problems In the present invention, an upper holder and a cam are attached to a ram that can be driven up and down, and the punch is fixed to the upper holder, while the lower holder is provided with a cam between the lower part and the side of the punch. a die that moves back and forth to be removably inserted into the cylindrical work; a work holding mechanism that receives the cylindrical work below the punch and aligns the axis of the cylindrical work with the longitudinal axis of the die; an axial positioning mechanism for axially positioning a cylindrical workpiece received in the workpiece holding mechanism; a fixed block that receives the work, a movable block that is disposed on the other side of the work holding mechanism in the front and back direction and is moved in a direction toward the fixed block by the cam during the descent of the ram; a biasing member that moves the cylindrical work in a direction away from the fixed block midway; and a biasing member that is urged toward the fixed block by the movable block so as to be movable back and forth, and presses the other end of the cylindrical work toward the fixed block. It is composed of a pressing block.

Operation When the die is stopped at the backward limit position and the ram is stopped at the upward limit position, the cylindrical workpiece is supplied to the workpiece holding mechanism below the punch, and the cylindrical workpiece received in this workpiece holding mechanism is After feeding the dice, the ram begins to descend. During the ram's descent, a cam fixed to the ram moves the movable block of the axial positioning mechanism toward the fixed block. This movement of the movable block toward the fixed block causes the pressing block to push the other end of the cylindrical work toward the fixed block, and the fixed block receives one end of the cylindrical work. Thereby, the axial positioning of the cylindrical workpiece is performed using the fixed block as a reference. At this time, the pressing block moves back and forth relative to the movable block to absorb variations in dimensions within the intersection of the axial lengths of the cylindrical workpiece. As the ram continues to descend, the punch punches out a hole at a predetermined position on the circumferential wall of the cylindrical workpiece located between it and the die. After this, when the ram starts to rise, the punch separates from the cylindrical workpiece. During the subsequent upward movement of the ram, when the cam separates from the movable block, the biasing member moves the movable block away from the fixed block. By this movement of the movable block toward the side opposite to the fixed block, the pressing block is urged against the movable block to return to its original position and separate from the other end of the cylindrical workpiece, thereby completing the positioning operation of the axial positioning mechanism. , the ram stops at the upper limit position. After the die is extracted from the cylindrical workpiece,
The cylindrical work is taken out of the device from the work holding mechanism. This completes one cycle of the punching operation in the peripheral wall of the cylindrical workpiece by press working.

Embodiments Hereinafter, embodiments of this invention will be described in detail based on the drawings.

In Figures 1 to 7, 1 indicates a ram, 2 indicates an upper holder attached to the ram 1, and this upper holder 2
Punch 3 is fixed to. 4 shows a lower holder attached to a bolster (not shown), which includes a product shooter 5, a first scrap shooter 6, a second scrap shooter 7, a die 8, a work holding mechanism 9, and a lower holder. , and an axial positioning mechanism 10. The product shooter 5 is the punch 3 of the lower holder 4.
It is provided below and is configured as a hole that penetrates from the top surface of the lower holder 4 to the side surface. The first scrap shooter 6 and the second scrap shooter 7 are arranged side by side with a required gap on the side or rear of the product shooter 5, and like the product shooter 5, are placed from the upper surface of the lower holder 4. It has a hole that goes through the side. The die 8 is inserted into and removed from the cylindrical workpiece W by moving back and forth from below the punch 3 to the side, that is, forward as indicated by arrow _X1 and backward as indicated by arrow _X2 . In this example, since a cylindrical pipe is used as the cylindrical work W, the die 8
is a round bar having an axial length longer than the axial length of the cylindrical workpiece W and an outer diameter slightly smaller than the inner diameter of the cylindrical workpiece W. A female mold hole 8a is provided which penetrates through the hole 8a. The dice 8 is guided in its forward and backward movement by a plurality of guide blocks 11, 12, 13, and 14 installed upright on the lower holder 4.
Rotation in the circumferential direction is prevented by a rotation restriction mechanism 15 consisting of a concave portion 15a and a convex portion 15b provided across the die 8 and the plurality of guide blocks 11-14. Specifically, the concave portion 15a extends along the axial direction in a portion of the outer peripheral surface of the die 8 where the female die hole 8a is not arranged, and the convex portion 15b extends in the die sliding hole 11a of the plurality of guide blocks 11 to 14. ~
14a Projects inward from the wall surface. When the die 8 is at its forward movement limit position, it is engaged with two guide blocks 13 and 14 located at the front and rear of the product shooter 5, as shown in FIG. It is brought into contact with a stopper 16 erected thereon, and its female die hole 8a is vertically aligned with the punch 3. In addition, at the rear movement limit position, as shown in Fig. 1, the die 8
A plurality of guide blocks 11 to 13 other than the one guide block 14 located in front of the product shooter 5
It is arranged so that its tip does not protrude forward from the front surface of the guide block 13 located immediately behind the product shooter 5, and its female die hole 8a is located above the second scrap shooter 7. It is placed in The rear end of the die 8 is connected to an actuating rod 18 of a cylinder 18 as an actuator, which is suspended horizontally on the lower holder 4 via a bracket 17.
a, and is configured to move back and forth by the telescopic drive of the cylinder 18. The workpiece holding mechanism 9 receives the cylindrical workpiece W below the punch 3 and aligns the axis of the cylindrical workpiece W with the longitudinal axis of the die 8 . In this embodiment, the workpiece holding mechanism 9 consists of a pair of left and right holding blocks 19, 20.
It is composed of This holding block 19, 20
The lateral movement perpendicular to the back-and-forth movement direction of the die 8 is placed on the product shooter 5 via guide mechanisms 21 and 22 consisting of convex portions 21a and 22a and concave portions 21b and 22b provided across these and the lower holder 4, respectively. It is arranged so that it can be opened and closed in the left and right directions. Operating rods 25a and 26a of cylinders 25 and 26 as actuators are connected to the holding blocks 19 and 20 on the left and right sides of the lower holder 4 via brackets 23 and 24, respectively.
The holding blocks 19,
20 is designed to open and close. Approximately 1/4 on the upper half of the mating surface of each of the holding blocks 19 and 20
Arc-shaped receiving recesses 27 and 28 extend in the front-rear direction. Specifically, as shown in FIG. 2, when the holding blocks 19 and 20 are moved in the direction of arrow _Y1 and brought together, the receiving recesses 27 and 28
becomes a substantially semicircular recess to receive the lower half of the outer peripheral surface of the cylindrical workpiece W. On the contrary, the sixth
As shown in Figure C, the holding blocks 19 and 20 are
When opened in the _Y direction, the respective receiving recesses 27,
28 are separated from each other in a substantially 1/4 arc shape, and the cylindrical workpiece W is allowed to fall naturally into the product shooter 5 through the mating surfaces of the holding blocks 19 and 20. The axial positioning mechanism 10 is a work holding mechanism 9
In this embodiment, a fixed block 29 and a movable block 30 are provided on the front and rear parts of the product shooter 5 of the lower holder 4. It consists of The fixing block 29 forms the front wall of the guide block 13 located immediately behind the product shooter 5. The movable block 30 has a convex portion 31a and a concave portion 31b provided across the movable block 30 and the lower holder 4.
It is movable back and forth through a guide mechanism 31 consisting of
is moved in the direction shown by _arrow The return spring 35 interposed between the spring seat 34a set on the rear wall of the receiving groove 34 allows the ram 1 to move upward while the punch 3 is on the receiving recesses 27 and 28 of the workpiece holding mechanism 9. cylindrical work W
After moving further away, it is moved forward in the direction indicated by arrow _X1 . A pressing block 36 is attached to the rear half of the movable block 30 so as to be movable back and forth. This press block 36 and the front half of the movable block 30 have die insertion holes 3 that penetrate in the front and back direction.
7 and 38 are formed coaxially. Pressing block 3
The diameter of the die insertion hole 37 of No. 6 is set to be smaller than the outer diameter of the cylindrical workpiece W. The press block 3 is disposed between the rear end surface of the press block 36 and the bottom surface of the press block accommodating portion 30a of the movable block 30.
A return spring 39 is interposed which urges 6 backward in the direction of arrow _X2 . In other words, as shown in FIG.
When the press block 36 moves backward, the rear surface of the press block 36 exposed behind the movable block 30 presses the front end of the cylindrical workpiece W, and the rear end of the cylindrical workpiece W is pushed against the fixed block 2.
9, the cylindrical workpiece W is positioned in the axial direction with reference to the fixed block 29. At this time, the pressing block 36 moves forward against the return spring 39 to absorb dimensional variations within the tolerance of the axial length of the cylindrical workpiece W. Contrary to the above, when the downel cam 32 moves away from the movable block 30 due to the rise of the ram 1 as shown in FIG. 1, the return spring 39 moves the movable block 30 forward and the spring seat 33 At the same time as it comes into contact with the front wall of the receiving groove 34, the pressing block 36 is moved backward by the return spring 39, and the movable block 3
The pressing block 36 is in contact with a stopper 40 fixed at zero, and the rear end surface of the pressing block 36 is separated from the front end of the cylindrical workpiece W. A die escape notch 32a is formed in the lower part of the dowel cam 32 with an open lower end. On the other hand, 41 is a pad that holds the cylindrical work W in cooperation with the work holding mechanism 9 when the ram 1 is lowered, and the pad 41 is placed downward around the punch 3 disposed portion of the ram 1. It is attached via a pad spring 42 that biases it. Padded 41
A punch insertion hole 41a is formed at approximately the center of the pad 41, and when the pad 41 is not in contact with the cylindrical workpiece W, the tip of the punch 3 is inserted into the punch as shown in FIG. It is arranged in the insertion hole 41a. A punch insertion hole 4 is provided on the underside of the pad 41.
A substantially semicircular receiving recess 43 for receiving the upper half of the outer circumferential surface of the cylindrical workpiece W extends in the front-rear direction with la as the center. . 44 and 45 are pads 41 of Ram 1
A pair of left and right dowel cams vertically installed on the left and right outer portions of the installation part, which are held in a closed position before the punch 3 contacts the cylindrical workpiece W as the ram 1 descends. It circumscribes the blocks 19 and 20, and positions the lateral positions of the holding blocks 19 and 20 and the lateral position of the cylindrical work W with reference to the punch 3. Reference numeral 46 denotes a scrap extrusion mechanism, which includes a gate-shaped bracket 47 installed in the lower holder 4 to straddle the second scrap shooter 7 from side to side, and a cylinder serving as an actuator attached to the upper wall of the bracket 47. 48
and an extrusion member 49 attached to the tip of the operating rod of the cylinder 48. When the die 8 is at the rear movement limit position, the extrusion member 49 is formed on the upper wall of the bracket 47 by the expansion and contraction drive of the cylinder 48. It is inserted into and removed from the through hole 47a of the die 8 in the vertical direction and inserted into the female hole 8a of the die 8.
The scrap P is pushed out from the female die hole 8a to the second scrap shooter 7.

On the other hand, the telescopic drive of the cylinder 18 of the die 8, the cylinders 25 and 26 of the workpiece holding mechanism 9, and the cylinder 48 of the extrusion mechanism 46, and the lifting and lowering drive of the ram 1 are controlled by a controller 50 shown in FIG. Specifically, controller 5
0 indicates that the cylindrical workpiece W has been received in the workpiece holding mechanism 9 or a press start signal _S1 caused by the operation of a manual switch (not shown) and a ram ascent limit position signal
A forward position switching signal is sent to the die cylinder control valve 51 by _S2 , the work holding mechanism closing position signal _S3 , and the extrusion member upper limit position signal _S4 .
It also outputs a backward movement position switching signal T ₂ to the die cylinder control valve ₅₁ based on the ram lower limit position signal S ₅ and the ram upper limit position signal S ₂ .
It also outputs an open position switching signal _T3 to the work holding mechanism cylinder control valve 52 according to the ram ascent limit position signal _S2 and the die rear movement limit position signal _S6 . 52, after the required time (sufficient time for the cylindrical workpiece W to fall from the workpiece holding mechanism 9 to the product shooter 5) after switching to the open position, a closing position switching signal _T4 is output, and the workpiece holding mechanism cylinder control valve 5
When the cylinder 2 reaches the closed position, the cylinder 2
Leak signal to reduce the supply operating pressure to 5, 26
_T5 is output to the work holding mechanism cylinder control valve 52, and a downward position switching signal _T6 is output to the extrusion mechanism cylinder control valve 53 according to the die rear movement limit position signal _S6 . The time required from switching to the lowering position (pushing member 4
After a sufficient time for the die 9 to pass through the female die hole 8a of the die 8, the ascending position switching signal _T7 is output, and the die front movement limit position signal _S7 causes the ram elevating drive mechanism 54 to start driving. The drive start signal T ₈ outputs a stop signal T ₉ to _the ram elevating drive mechanism 54 when the ram elevating drive mechanism 54 makes one round trip between lowering and lowering. ing. Note that the ram is stopped at the upper and lower limit positions.

According to the structure of the above embodiment, as shown in FIGS. 1 to 3, the die 8 is at the rear movement limit position, the ram 1 and the extrusion member 49 of the extrusion mechanism 46 are at the upper limit position, and the workpiece is held When the cylindrical workpiece W is supplied to the receiving recesses 27 and 28 of the workpiece holding mechanism 9 and the press processing start signal _S1 is input to the controller 50 while the mechanism 9 is in the closed state,
As shown in FIGS. 6A and 6B, the die 8 moves forward by the extension drive of the cylinder 18, and the tip of the die 8 moves from the guide block 13 through the inside of the cylindrical workpiece W, the movable block 30, and the guide block 14. The die 8 comes into contact with the stopper 16 and stops at the forward limit position. When the ram 1 descends, the dowel cam 32 moves the movable block 30 of the axial positioning mechanism 10 backward to position the cylindrical workpiece W in the axial direction with respect to the fixed block 29. After the work holding mechanism 9 is positioned in the left-right direction by separate dowel cams 44 and 45, the receiving recess 43 of the pad 41 comes into contact with the upper half of the outer peripheral surface of the cylindrical work W. Continuing Ram 1
The pad spring 42 is compressed by the lowering of the
The cylindrical work W is held by the pad 41 and the work holding mechanism 9 while being positioned in the left and right direction by the biasing force of the pad spring 42.
As the ram 1 continues to descend, the punch 3 protrudes from the punch insertion hole 41a of the pad 41, punches a hole in the peripheral wall between the pad 41 of the cylindrical workpiece W and the die 8, and enters the female die hole 8a. to go into. Then, when the ram 1 rises from the lower limit position by the lifting drive mechanism 54 without the punch 3 penetrating the female die hole 8a downward, the punch 3 moves from the female die hole 8a above the cylindrical workpiece W. After moving, the pad 41 separates from the cylindrical work W, then the dowel cams 44 and 45 separate from the work holding mechanism 9, and another dowel cam 32 moves away from the movable block 30.
The movable block 30 moves forward by the return spring 35, the pressing block 36 separates from the front end of the cylindrical workpiece W, and the ram 1 stops at the upper limit position. Then, the cylinder 18 is driven to contract by the controller 50, and the die 8 is moved backward.
The tip of the die 8 comes out of the guide block 14, the movable block 30, and the cylindrical work W in sequence and stops at the rear movement limit position. During the backward movement of the die 8, the scrap P existing in the female die hole 8a falls to the first scrap shooter 6 at the same time as the female die hole 8a comes out of the guide block 13. When the die 8 stops at the backward movement limit position, as shown in FIG.
As shown in FIG. 2, the workpiece holding mechanism 9 is opened and operated by the controller 50, and the cylindrical workpiece W having a hole in the peripheral wall falls as a product into the product shooter 5 under its own weight. At approximately the same time as this opening of the work holding mechanism 9, the extrusion mechanism 46 is driven by the controller 50, and the extrusion member 49 vertically passes through the female die hole 8a as shown in FIG. 6D. Then,
During the backward movement of the die 8 described above, the scrap P remaining in the female mold hole 8a without falling into the first scrap shooter 6 due to its own weight is removed by the extrusion member 49 into the second scrap shooter 6.
It is discharged into the scrap shooter 7. After this,
As shown in FIGS. 1 to 3, the controller 50 stops the die 8 at the backward movement limit position, stops the ram 1 and the pushing member 49 at the upward movement limit position, and closes the workpiece holding mechanism 9. In addition, a so-called press processing standby state is entered, and the above-described operations can be repeated by inputting the press processing start signal _S1 .

Although not shown in the drawings, the controller 50 of the embodiment described above can be realized by sequence control or programmable control using a computer.

In addition, the female die hole 8a of the punch 3 and die 8
If it is formed into an irregular shape, rectangular holes and long holes can also be formed at the same time.

Effects of the invention As described above, according to the invention, the ram that can be driven up and down is equipped with a punch and a cam, the lower holder is equipped with a die, a workpiece holding mechanism, and an axial positioning mechanism, and the workpiece holding mechanism The axial positioning mechanism ensures alignment between the axis of the cylindrical workpiece and the longitudinal axis of the die, and the axial positioning mechanism ensures the axial positioning of the cylindrical workpiece. It can be punched and formed.

Moreover, according to the present invention, since the axial positioning mechanism is composed of a fixed block, a movable block, a biasing member, and a pressing block, the ram-side cam moves the movable block while the ram is lowering. ,
The pressing block pushes the other end of the cylindrical workpiece, and the fixed block receives one end of the cylindrical workpiece, so that the axial position of the cylindrical workpiece can be positioned with the fixed block as a reference.

Further, according to the present invention, since the lowering of the ram is used to position the cylindrical workpiece in the axial direction, a driving force dedicated to positioning is not required.

Further, according to the present invention, since the pressing block is assembled to the movable block so as to be able to move back and forth while being urged toward the fixed block, in the process of axially positioning the cylindrical workpiece, the pressing block It moves back and forth relative to the movable block according to the axial length of the cylindrical workpiece, and can absorb dimensional variations within the intersection of the axial lengths of the cylindrical workpiece.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 1, Fig. 4 is a sectional view taken along the - line in Fig. 1, and Fig. 5 is an exploded view of the same example with the ram omitted. The perspective view and FIGS. 6A to 6D are action explanatory diagrams showing different processing steps in the same embodiment, and FIG. 7 is a schematic diagram showing the controller of the same embodiment. 1... Ram, 2... Upper holder, 3... Punch,
4... Lower holder, 8... Dice, 9... Work holding mechanism, 10... Axial positioning mechanism, 29...
Fixed block, 30... Movable block, 32...
Dowel cam (cam), 35... Return spring (biasing member), 36... Pressing block, 3
9... Return spring (spring that biases the pressing block toward the fixed block), W... Cylindrical workpiece.

Claims (1)

[Claim for Utility Model Registration] An upper holder and a cam are attached to a ram that can be moved up and down, and the punch is fixed to the upper holder, while the lower holder has a cam that can be moved back and forth between the bottom and sides of the punch. A die that is removably inserted into a cylindrical workpiece with a punch, a workpiece holding mechanism that receives the cylindrical workpiece below the punch and aligns the axis of the cylindrical workpiece with the longitudinal axis of the die, and a workpiece holding mechanism that an axial positioning mechanism that positions the received cylindrical workpiece in the axial direction; and a fixing member that is disposed on one side of the workpiece holding mechanism in the front and back direction and that receives one end of the cylindrical workpiece. a movable block which is disposed on the other side of the work holding mechanism in the front and back direction and is moved by the cam in a direction approaching the fixed block while the ram is in the process of being lowered; a biasing member that moves the cylindrical workpiece in a direction away from the fixed block; and a biasing member that is assembled to the movable block so that it can be moved back and forth while being biased toward the fixed block side, and presses the other end of the cylindrical workpiece toward the fixed block side. A press processing device for a cylindrical workpiece, characterized by comprising a press block that presses the workpiece.