Mounting structure of caulking holder

Abstract

To provide a mounting structure of a caulking holder having a caulking punch, which can easily mount and remove the caulking holder.SOLUTION: A mounting structure of a caulking holder includes: a caulking punch 2 which plastically deforms a workpiece; a caulking holder 3 which stores the caulking punch 2 by projecting a tip; and a piston rod 4 which fits a tip into the caulking holder 3 and presses the caulking holder 3. A collar 17 is fitted into the caulking holder 3 so as to be movable in an axial direction and non-rotatable in a circumferential direction. The collar 17 has one position in the axial direction, which is engaged with the piston rod 4, and the other position in the axial direction, which releases the engagement with the piston rod 4. The caulking holder 3 has an engagement position in the circumferential direction, which is engaged with the piston rod 4, and a release position in the circumferential direction, which releases the engagement with the piston rod 4. The collar 17 is positioned at the one position at the engagement position of the caulking holder 3 so as to make the caulking holder non-rotatable. The caulking holder 3 is made rotatable at the other position of the collar 17.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mounting structure for a crimping holder having a crimping punch that applies local pressure to a workpiece to cause plastic deformation. [Background technology]

[0002] In this type of mounting structure for a crimping holder, the base of the crimping punch is expanded to form a flange, and this flange is supported and housed in a crimping holder (ball holder) via a number of rolling balls so that it can move in parallel, and the crimping holder (ball holder) is attached to a shank holder attached to a press mechanism. Then, a crimping die formed at the tip opposite the base of the crimping punch applies pressure to the workpiece, plastically deforming the workpiece into the desired shape. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-55496 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such a conventional crimping holder mounting structure, the crimping holder (ball holder) housing the flange of the crimping punch is attached with bolts to the shank holder attached to the press mechanism. Therefore, when the crimping punch wears out due to repeated use of the crimping punch, the bolts must be loosened to remove the crimping holder (ball holder) from the junk holder, a new crimping punch must be housed in the crimping holder (ball holder), and the bolts must be retightened to attach it to the junk holder. In particular, when the press mechanism is installed in a small space, tools such as screwdrivers for tightening and loosening the bolts are difficult to handle, making it difficult to attach and remove the crimping holder.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a mounting structure for a crimping holder that enables a crimping holder having a crimping punch to be easily mounted and removed. [Means for solving the problem]

[0006] In order to achieve this object, the present invention takes the following measures: This crimp holder mounting structure comprises a crimping punch which applies pressure to the workpiece to plastically deform the workpiece, a crimping holder which houses the crimping punch with the tip of the crimping punch protruding from it, and a piston rod whose tip is fitted into the crimping holder and presses the crimping holder, a collar is fitted into the back of the crimping holder opposite the tip of the crimping punch so that it can move in the axial direction but cannot rotate in the circumferential direction, the collar has one axial position where it engages with the piston rod and another axial position where it disengages from the piston rod, the crimping holder has a circumferential engagement position where it engages with the piston rod and a circumferential release position where it disengages from the piston rod, and when the crimping holder is in the engagement position the collar is located in one position to prevent the crimping holder from rotating, and when the collar is in the other position the crimping holder is rotatable.

[0007] In this case, a spring may be provided to bias the collar toward the one position. Alternatively, either one of the crimp holder and the collar may have an elongated hole extending in the axial direction formed therein, and the other may have a first pin to be inserted into the elongated hole formed therein. Alternatively, either one of the crimp holder and the piston rod may have an approximately L-shaped L-hole consisting of an axial hole extending in the axial direction and a peripheral hole extending in the circumferential direction perpendicular to the axial hole formed therein, and the other may have a second pin to be inserted into the L-hole formed therein, and the crimp holder may be positioned at the engagement position by inserting the second pin into the peripheral hole of the L-hole, and the crimp holder may be positioned at the release position by inserting the second pin into the axial hole of the L-hole. Effect of the Invention

[0008] As described above in detail, the invention described in claim 1 has a collar fitted to the back of the crimping holder opposite the tip of the protruding crimping punch so as to be movable in the axial direction but not rotatable in the circumferential direction, the collar has one axial position where it engages with the piston rod and another axial position where it disengages from the piston rod, the crimping holder has a circumferential engagement position where it engages with the piston rod and a circumferential release position where it disengages from the piston rod, and at the engagement position of the crimping holder the collar is located at one position to make the crimping holder unrotatable, and at the other position of the collar the crimping holder is rotatable. Therefore, when the collar is moved to the other position, the crimping holder can be rotated from the engagement position to the release position, so that the crimping holder can be easily installed and removed without the need for tools, compared to the conventional installation structure in which the crimping holder is installed and removed by tightening and loosening the bolt with a tool.

[0009] In addition, the invention described in claim 2 provides a spring that biases the collar toward one position. Therefore, the collar in one position can be reliably held in position by the elastic force of the spring, so that the crimping holder can maintain a good engagement state with the piston rod even if it receives an impact accompanying the use of the crimping punch.

[0010] In the invention described in claim 3, a long hole extending in the axial direction is formed in either the crimp holder or the collar, and a first pin to be inserted into the long hole is provided in the other. Therefore, since the first pin engages with the long hole, it is possible to effectively prevent the collar from coming off the crimp holder when the crimp holder is removed from the piston rod.

[0011] In the invention described in claim 4, a roughly L-shaped L-hole consisting of an axial hole extending in the axial direction and a peripheral hole extending in the circumferential direction perpendicular to the axial hole is formed on one of the crimp holder and the piston rod, and a second pin is provided on the other of them to be inserted into the L-hole, and the crimp holder is positioned in the engagement position by inserting the second pin into the peripheral hole of the L-hole, and the crimp holder is positioned in the release position by inserting the second pin into the axial hole of the L-hole. Therefore, the crimp holder can be reliably positioned in the engagement position and the release position, so that the crimp holder can be reliably attached and detached. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of a crimping machine using a crimping holder mounting structure according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line BB in FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view taken along line CC in FIG. 2. [Diagram 5] 3 is a perspective view of the collar shown in dashed lines as seen from arrow D in FIG. 2. [Figure 6] FIG. 6 is a diagram showing a state different from that shown in FIG. 5. [Figure 7] FIG. 6 is a diagram showing a state different from that of FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 denotes a block, which is provided with a first piston rod 4, the tip of which is attached a crimping holder 3 that houses a crimping punch 2 that applies pressure to a workpiece W to plastically deform the workpiece W, and a second piston rod 6, the tip of which is attached a fixture 5 for fixing the workpiece W. Pistons 7, 8 are formed integrally with the piston rods 4, 6, respectively. Inside the block 1, rod side chambers 9, 10 are defined and formed on the side from which the piston rods 4, 6 of the pistons 7, 8 protrude, and cap side chambers 11, 12 are defined and formed on the side opposite the rod side chambers 9, 10 with the pistons 7, 8 interposed therebetween. Rod side flow paths 13, 14 are connected to the rod side chambers 9, 10, and cap side flow paths 15, 16 are connected to the cap side chambers 11, 12. Hydraulic oil is allowed to flow freely through each of the flow paths 13 to 16.

[0014] The piston rod 4 moves downward in Fig. 1 while discharging hydraulic oil from the rod side chamber 9 to the rod side flow passage 13 due to the supply of hydraulic oil from the cap side flow passage 15 to the cap side chamber 11, and moves upward in Fig. 1 while discharging hydraulic oil from the cap side chamber 11 to the cap side flow passage 15 due to the supply of hydraulic oil from the rod side flow passage 13 to the rod side chamber 9. In addition, the piston rod 6 moves downward in Fig. 1 while discharging hydraulic oil from the rod side chamber 10 to the rod side flow passage 14 due to the supply of hydraulic oil from the cap side chamber 10 to the rod side flow passage 16 to the cap side chamber 12, and moves upward in Fig. 1 while discharging hydraulic oil from the cap side chamber 12 to the cap side flow passage 16 due to the supply of hydraulic oil from the rod side flow passage 14 to the rod side chamber 10.

[0015] As shown in Figs. 2 to 5, the piston rod 4 is connected to the main body 4A at the tip to form a medium diameter portion 4B and a small diameter portion 4C. The medium diameter portion 4B is smaller in diameter than the main body 4A and forms a flat surface 4D on a part of the outer periphery. The small diameter portion 4C is smaller in diameter than the medium diameter portion 4B and is the most distal end. The crimping punch 2 protrudes at its tip from the crimping holder 3 and is fixed to the crimping holder by two nut members 5 and 6. The crimping holder 3 has a back portion that faces the protruding tip of the crimping punch 2 fitted into the small diameter portion 4C of the piston rod 4, and the end of the back portion abuts against the connecting step between the medium diameter portion 4B and the small diameter portion 4C of the piston rod 4. The crimping holder 3 is formed so that the outer diameter dimension of the back portion is approximately the same as that of the medium diameter portion 4B of the piston rod 4, and forms a flat surface 3B on a part of the outer periphery that has approximately the same width dimension W as the flat surface 4D of the medium diameter portion 4B.

[0016] Reference numeral 17 denotes a cylindrical collar which forms a through hole 18 penetrating therethrough in the axial direction. The inner diameter of the through hole 18 is formed to be slightly larger than the outer diameter of the rear part of the crimping holder 3 and the outer diameter of the medium diameter part 4B of the piston rod 4. The through hole 18 also forms a flat surface 18A on part of the inner circumference, and the width dimension of the flat surface 18A is formed to be slightly larger than the width dimension W of the flat surface 3B of the crimping holder 3 and the flat surface 4D of the medium diameter part 4B. The collar 17 is fitted to the rear part of the crimping holder 3 with the flat surface 18A coinciding with the flat surface 3B of the crimping holder 3, allowing it to move in the axial direction but not to rotate in the circumferential direction.

[0017] The collar 17 has one axial position where it engages with the piston rod 4, and the other axial position where it is released from the engagement with the piston rod 4. In the one position of the collar 17, the flat surface 18A matches the flat surface 4D of the medium diameter portion 4B of the piston rod 4. In the other position of the collar 17, the matching between the flat surface 18A and the flat surface 4D is released. Reference numeral 19 denotes a spring interposed between the crimp holder 3 and the collar 17, which urges the collar 17 toward the one position. The collar 17 is urged by the elastic force of the spring 19, and in the one position, the axial end of the collar 17 abuts against the connecting step between the main body portion 4A and the medium diameter portion 4B of the piston rod 4.

[0018] Reference numeral 20 denotes an elongated hole formed in the collar 17, which extends in the axial direction penetrating between the outer peripheral surface and the inner peripheral surface of the collar 17. Reference numeral 21 denotes a first pin protruding in the radial direction from the rear portion of the crimping holder 3, which is inserted into the elongated hole 20 of the collar 17. When the crimping holder 3 is removed from the piston rod 4, one axial end 20A of the elongated hole 20 abuts against the first pin 21, and the collar 17, which is biased by the elastic force of the spring 19, does not come off from the crimping holder 3.

[0019] Reference numeral 22 denotes an L-shaped hole formed in the back of the crimping holder 3, which is made up of an axial hole 22A that penetrates between the outer peripheral surface and the inner peripheral surface at a position that is approximately opposite in the radial direction to the protruding position of the first pin 21, extends in the axial direction to the back end, and a peripheral hole 22B that extends in the circumferential direction perpendicular to the axial hole 22A. Reference numeral 23 denotes a second pin that protrudes in the radial direction from the small diameter portion 4C of the piston rod 4, which is inserted into the L-shaped hole 22 of the crimping holder 3.

[0020] The crimp holder 3 has a circumferential engagement position where it engages with the piston rod 4, and a circumferential release position where it releases the engagement with the piston rod 4. When the crimp holder 3 is in the engagement position, the collar 17 is in one position to prevent the crimp holder 3 from rotating, and the second pin 23 inserted into the L-shaped hole 22 is in the circumferential hole 22B. When the crimp holder 3 is in the release position, the collar 17 is in the other position to allow the crimp holder 3 to rotate, and the second pin 23 inserted into the L-shaped hole 22 is in the axial hole 22A.

[0021] Next, the operation of this configuration will be described. In the state shown in Fig. 1, the piston rod 6 is moved downward and the workpiece W is fixed by the fixture 5. With the workpiece W fixed, the piston rod 4 is moved downward and the workpiece W is plastically deformed and processed by the crimping punch 2. When the processing of the workpiece W is completed, the piston rod 4 is moved upward, and then the piston rod 6 is moved upward to release the fixation of the workpiece W and return to the state shown in Fig. 1. Next, a new workpiece W is fixed and processed in the same manner, and this process is repeated thereafter.

[0022] Next, a case will be described in which the crimping punch 2 is worn out after machining a large number of workpieces W and is replaced with a new crimping punch 2. 2 to 5 show a state in which the crimping holder 3, which houses the crimping punch 2, is attached to the tip of the piston rod 4, with the collar 17 being biased by the elastic force of the spring 19 to one position, with the axial end abutting against the connecting step between the main body 4A and the medium diameter portion 4B of the piston rod 4, and the flat surface 18A coinciding with the flat surface 4D of the medium diameter portion 4B of the piston rod 4, rendering the crimping holder 3 immovable. The crimping holder 3 is in the engaged position, with the second pin 23 inserted into the L-shaped hole 22 positioned in the peripheral hole 22B.

[0023] In this state, as shown in Fig. 6, when the operator manually moves the collar 17 downward against the elastic force of the spring 19, the collar 17 is positioned at the other position, the flat surface 18A (shown in Fig. 3) is released from the flat surface 4D, and the engagement with the piston rod 4 is released. The crimp holder 3 becomes rotatable.

[0024] In this state, when the operator rotates the crimp holder 3 together with the collar 17 to position the second pin 23 in the shaft hole 22A, the crimp holder 3 is positioned at the release position and the engagement with the piston rod 4 is released.

[0025] In this state, when the operator manually moves the crimping holder 3 downward as shown in Fig. 7, the crimping holder 3 is detached and removed from the piston rod 4 together with the collar 17. Then, the crimping holder 3 replaced with a new crimping punch 2 is attached to the piston rod 4 in the reverse procedure to that described above.

[0026] When installing and removing such a crimp holder 3, a collar 17 is fitted to the back of the crimp holder 3 opposite the tip that protrudes the crimp punch 2 so that it can move in the axial direction but cannot rotate in the circumferential direction, and the collar 17 has one axial position where it engages with the piston rod 4 and another axial position where it disengages from the piston rod, and the crimp holder 3 has a circumferential engagement position where it engages with the piston rod 4 and a circumferential release position where it disengages from the piston rod, and when the crimp holder 3 is in the engagement position the collar 17 is located at one position making the crimp holder 3 unable to rotate, and when the collar 17 is in the other position the crimp holder 3 can be rotated. Therefore, when the collar 17 is moved to the other position, the crimp holder 3 can be rotated from the engagement position to the release position. Therefore, compared to the conventional mounting structure in which the crimp holder is attached and removed by tightening and loosening the bolt with a tool, the crimp holder 3 can be easily attached and removed without the need for tools.

[0027] In addition, a spring 19 is provided to bias the collar 17 toward one position. Therefore, the collar 17 located at one position can be reliably held in position by the elastic force of the spring 19, so that the crimping holder 3 can maintain a good engagement state with the piston rod 4 even if it receives an impact accompanying the use of the crimping punch 2.

[0028] Further, an elongated hole 20 extending in the axial direction is formed on one of the crimp holder 3 and the collar 17, and a first pin 21 to be inserted into the elongated hole 20 is provided on the other of the crimp holder 3 and the collar 17 is prevented from coming off the crimp holder 3 when the crimp holder 3 is removed from the piston rod 4.

[0029] Further, the crimp holder 3 and the piston rod 4 are formed with an approximately L-shaped L-hole 22 consisting of an axial hole 22A extending axially on one side and a peripheral hole 22B extending circumferentially perpendicular to the axial hole 22A on the other side, and a second pin 23 to be inserted into the L-hole 22 is provided on the other side, and the crimp holder 3 is positioned at the engagement position by inserting the second pin 23 into the peripheral hole 22B of the L-hole 22, and the crimp holder 3 is positioned at the release position by inserting the second pin 23 into the axial hole 22A of the L-hole 22. Therefore, the crimp holder 3 can be reliably positioned at the engagement position and the release position, so that the crimp holder 3 can be reliably attached and detached.

[0030] In the above embodiment, the long hole 20 is formed in the collar 17 and the first pin 21 is protruding toward the crimp holder 3, but the long hole may be formed in the crimp holder and the first pin may be protruding toward the inside in the radial direction from the collar. Also, the L-shaped hole 22 is formed in the crimp holder 3 and the second pin 23 is protruding toward the piston rod 4, but it goes without saying that the L-shaped hole may be formed in the piston rod and the second pin may be protruding toward the inside in the radial direction from the crimp holder. In this case, the L-shaped hole formed in the piston rod is formed so that the axial hole reaches the tip of the piston rod. [Explanation of symbols]

[0031] 2: Crimping punch 3: Crimp holder 4: Piston rod 17:Color W: Workpiece

Claims

1. a piston rod having a tip fitted into the crimping holder and pressing the crimping holder, the piston rod having a tip fitted into the crimping holder and a collar fitted into the back of the crimping holder opposite the tip of the crimping punch such that the collar can move in the axial direction but cannot rotate in the circumferential direction, the collar having one axial position in which it engages with the piston rod and another axial position in which it disengages from the piston rod, the crimping holder having a circumferential engagement position in which it engages with the piston rod and a circumferential release position in which it disengages from the piston rod, the collar being positioned in one position when the crimping holder is in the engagement position to prevent the crimping holder from rotating, and the collar being positioned in the other axial position to allow the crimping holder to rotate.

2. 2. The mounting structure of claim 1, further comprising a spring for urging the collar toward the one position.

3. 3. A mounting structure for a crimp holder as described in claim 1 or 2, characterized in that a long hole extending in the axial direction is formed in one of the crimp holder and the collar, and a first pin to be inserted into the long hole is provided in the other of the crimp holder and the collar.

4. A mounting structure for a crimp holder as described in any one of claims 1 to 3, characterized in that an L-shaped hole having an approximately L shape is formed on one of the crimp holder and the piston rod, the L-shaped hole consisting of an axial hole extending in the axial direction and a peripheral hole extending in the circumferential direction perpendicular to the axial hole, and a second pin is provided on the other of the crimp holder for insertion into the L-shaped hole, and the crimp holder is positioned at the engagement position by inserting the second pin into the peripheral hole of the L-shaped hole, and the crimp holder is positioned at the release position by inserting the second pin into the axial hole of the L-shaped hole.

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