JP5044200B2 - Wire rod chuck device and forging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chuck device for a wire rod which attains an increase in operating speed, and to provide a heading machine for a wire rod provided with the chuck device and capable of attaining improvement in productivity. <P>SOLUTION: The chuck device incorporated into the heading machine comprises: a pair of freely rotatably supported chuck cylinders (52<SB>L</SB>, 52<SB>R</SB>); a pair of chuck grooves respectively formed on the outer circumferential faces of the chuck cylinders (52<SB>L</SB>, 52<SB>R</SB>), and forming a holding passage for the wire rod A when facing with each other with a transport passage 2 between them; a chuck cylinder (54) pressing either chuck cylinder (52<SB>R</SB>) toward the other chuck cylinder (52<SB>L</SB>), and tightening the wire rod A in the holding passage between a pair of the chuck grooves; and a rotary device (80) rotating a pair of the chuck cylinders (52<SB>L</SB>, 52<SB>R</SB>) in reverse directions each other and releasing the wire rod A between the chuck grooves from the holding passage. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a chuck device that chucks a wire rod and a forging machine that uses this chuck device and installs one end portion of the wire rod to expand the diameter.

  A wire forging machine and a chuck device of this type are disclosed in Patent Document 1, for example. The chuck device disclosed in Patent Document 1 includes a chuck having a divided structure, and the chuck includes a plurality of chuck units arranged so as to surround a transfer path of the wire. These chuck units cooperate with each other to form a pinching passage for the wire in the transfer path, and can reciprocate in conjunction with the radial direction of the clamping passage so that the clamping passage can be opened and closed.

In addition, when viewed in the wire transfer direction, the rear end portion of the chuck, that is, the rear end portion of the chuck unit, cooperates with each other to form a male tapered tube portion having a plurality of split grooves. It extends along the clamping path concentrically with the clamping path.
Therefore, when the female taper tube portion is taper-fitted from the outside to the male taper tube portion in a state where the wire material passes through the pinch passage and is closed, each chuck unit is directed toward the wire material in the pinch passage. As a result, the chuck can firmly chuck the wire.

On the other hand, the forging machine of Patent Document 1 includes an upsetting device in front of the chuck device as viewed in the direction in which the wire is transferred, and the upsetting device is installed in a state where the wire material is chucked on the chuck device. The end of the protruding wire is installed and the diameter is increased.
Japanese Patent Publication No.52-478

In the case of the chuck device of Patent Document 1, since the firm tightening of the wire is brought about by the taper fitting of the male and female tapered tube portions, the reciprocating stroke of the female taper tube portion becomes long, and the chuck device is tightened and released. Takes a lot of time.
In addition, in the case of the forging machine of Patent Document 1, the wire is returned to the rear of the chuck device along the transfer path after the end of the wire is processed by the upsetting device. Is already formed as an enlarged diameter portion, the clamping passage of the chuck device must be opened as much as possible so that its inner diameter is larger than the outer diameter of the enlarged diameter portion. For this reason, the reciprocation stroke of each chuck | zipper unit in a chuck device becomes long, and much time is required for opening and closing of a clamping passage.

As a result, in the case of a forging machine using the above-described type of chuck device, the productivity of the processed wire is limited by the operating speed of the chuck device, and the productivity cannot be further improved.
The present invention has been made on the basis of the above-mentioned circumstances, and an object of the present invention is to improve productivity by using a wire rod chuck device capable of increasing the operation speed and the chuck device. An object of the present invention is to provide a wire rod forging machine.

In order to achieve the above object, a wire rod chuck device according to the present invention has axes arranged on both sides of a wire transfer path, extending along the transfer path, rotatable around the axis, and crossing the transfer path. A pair of chuck cylinders that are supported so as to be relatively close to and away from each other in a direction, and a pair that is formed so as to face the outer peripheral surfaces of the pair of chuck cylinders with a transfer path interposed therebetween, and that secures a wire holding path in the middle of the transfer path of the chuck groove, the pair of chuck cylinder taken away relatively against the said transverse direction, and tightening clamping means the wire clamping passage in between the chuck grooves when the pair of chuck cylinder is close, the pair Rotating means that rotates the chuck cylinders in opposite directions and reciprocates along the circumferential direction of the corresponding chuck cylinder so that the distance between the pair of chuck grooves is increased or decreased. (Claim 1).

According to the above chuck device, the wire rod is inserted into the clamping passage in a state where the clamping passage is formed between the pair of chuck grooves, and then the pair of chuck cylinders are relatively pressed against each other by the tightening means. Then, the wire is clamped between the pair of chuck grooves, and the wire is chucked.
Thereafter, after predetermined processing is performed on the wire, the chuck of the wire by the tightening means is released, and if the pair of chuck cylinders are rotated in the opposite directions by the rotating means, the pair of chuck grooves is formed into the chuck. The clamping passage is opened by separating from each other with the rotation of the cylinder. Therefore, the wire is released from the pair of chuck grooves and can be discharged from between the pair of chuck cylinders.

Preferably, each chuck cylinder has a plurality of chuck grooves which are formed apart from each other in the circumferential direction and have different sizes. In this case, the pair of chuck cylinders are rotated around their axes, and the pair of chuck grooves selected according to the outer diameter of the wire are arranged to face each other across the transfer path.
In this way, if each chuck cylinder is provided with chuck grooves having different sizes, a plurality of types of wires having different outer diameters can be chucked by the same chuck device.

Each chuck cylinder may further include a plurality of transverse grooves formed on an outer peripheral surface thereof, and the transverse grooves are disposed across the chuck groove and spaced apart in the axial direction of the chuck cylinder. (Claim 3).
Such a transverse groove increases the gripping force of the chuck groove when the wire is tightened between the pair of chuck grooves.

  Further, when the transfer path extends horizontally, the chuck device lifts the wire on the transfer path upward from between the pair of chuck cylinders when the separation distance between the pair of chuck grooves is expanded. (Claim 4). In this case, the processed wire is lifted above the transfer path, and can be transferred to the rear of the chuck device along the transfer path without interfering with the pair of chuck cylinders.

Preferably, the rotation means and the lift means may include a common drive source (Claim 5). In this case, the rotation means and the lift means operate in conjunction with each other.
Furthermore, the present invention also provides a forging machine that forms a diameter-expanded portion at one end of a wire material, similar to the forging machine of Patent Document 1, and this forging machine is a chuck according to any one of claims 4 and 5. The wire rod is placed in front of the chuck device as viewed in the apparatus and the wire transfer direction. One end portion of the wire rod protrudes from the pair of chuck cylinders and the wire rod is chucked by the chuck device. An upsetting device to be provided (claim 6).

  According to the forging machine described above, after the diameter-enlarged portion is formed at one end of the wire, the processed wire is released from the pair of chuck grooves of the chuck device, and at the same time, the position above the transfer path by the lift means, Specifically, the diameter-enlarged portion of the processed wire rod is lifted to an upper position located outside the outer peripheral surfaces of the pair of chuck cylinders. Therefore, in such a lifted state, the processed wire rod is pulled back to the rear of the chuck device along the transfer path without the diameter-expanded portion interfering with the pair of chuck cylinders.

  The wire rod chuck device according to claim 1 includes a pair of chuck cylinders, and the wire rod is clamped by clamping the wire rod between the pair of chuck grooves of the chuck cylinder. The cross-sectional area of the passage is sufficient to allow the passage of the wire, and the relative contact / separation distance between the pair of chuck cylinders required for tightening the wire by the tightening means, that is, the pressing stroke may be short. Further, since the clamping passage is opened by rotating the pair of chuck cylinders by a predetermined rotation angle in opposite directions, the clamping passage can be opened and closed quickly. As a result, there is provided a chuck device that achieves an increase in the operation speed of the operation including the tightening by the tightening means and the opening and closing of the pair of clamping passages.

Since the chuck device of claim 2 includes a plurality of pairs of chuck grooves, it can be used for chucks of a plurality of types of wire rods having different outer diameters, and the chuck device of claim 3 increases the grip force of the wire rod, It is possible to prevent the wire rod from slipping inside.
In the chuck device of the fourth aspect, when the clamping passage is opened, the wire can be lifted up above the pair of chuck cylinders by the lift means, and the wire is directed to the rear of the chuck cylinder regardless of the presence of the chuck cylinders. Can be pulled back.

In the chuck device according to the fifth aspect, since the rotating means and the lifting means operate in conjunction with each other from a common driving source, the lifting timing of the wire rod by the lifting means becomes accurate, and it is also effective for energy saving measures.
In the forging machine according to the sixth aspect, since the operation of the chuck device is high speed, the productivity of the wire having an enlarged diameter portion at one end thereof can be greatly improved.

FIG. 1 schematically shows a wire rod forging machine according to an embodiment.
The forging machine includes a transfer path 2 for the wire A, and the transfer path 2 extends horizontally. Here, the wire A is made of a PC (prestressed concrete) steel rod, and has a plurality of spiral grooves (not shown) on the outer peripheral surface thereof.
An upsetting device 4 is arranged at the downstream end of the transfer path 2, and a transferring device for the wire A is arranged upstream of the upsetting device 4, and this transferring device is a pair of pinch rollers 6 in FIG. 1. Shown only in. These pinch rollers 6 are arranged with the transfer path 2 interposed therebetween and can be brought into contact with and separated from each other. When the wire A is reciprocally transferred along the transfer path 2 by the transfer device, the transfer is guided. That is, the wire A can be advanced and retracted with respect to the upsetting device 4.

Further, a chuck device 8 is disposed between the pair of pinch rollers 6 and the upsetting device 4, and the chuck device 8 will be described later.
The upsetting device 4 includes a cylinder block 10, which has a cylinder bore 12 that is coaxial with the transfer path 2. A plunger 14 is slidably fitted to the cylinder bore 12, and the plunger 14 projects from the cylinder bore 12 toward the chuck device 8. A pressing punch 16 is attached to the protruding end of the plunger 14, and the pressing punch 16 is positioned on the transfer path 2.

On the other hand, a double-acting forging cylinder 18 is connected to the cylinder bore 12, and the forging cylinder 18 has a piston rod 20 that enters the cylinder bore 12.
Further, a cylinder bore 22 parallel to the cylinder bore 12 is formed in the cylinder block 10, and a piston rod 26 of a double-action type measuring cylinder 24 is slidably fitted to the cylinder bore 22. The piston rod 26 protrudes from the cylinder block 10 toward the chuck device 8.

  The protruding ends of the plunger 14 and the piston rod 26 are connected to each other via an arm 28. More specifically, although the arm 28 is fixed to the plunger 14, the piston rod 26 can be moved only to the right from the state shown in FIG. That is, the protruding end portion of the piston rod 26 is formed with a small diameter portion at the tip end side, and has a stepped shape having a step surface at the boundary with the small diameter portion. It is in contact with the step surface.

A compression coil spring 32 is stretched between a spring seat 30 provided at the tip of the piston rod 26 and the arm 28, and the compression coil spring 32 connects the arm 28 and the spring seat 30 to each other. Is pressed toward the step surface of the piston rod 26.
Further, a rack 34 is attached to the arm 28, and the rack 34 is connected to a rotary encoder 38 via a pinion 36. The rotary encoder 38 is fixed to the cylinder block 10 side.

  The forging cylinder 18 and the sizing cylinder 24 described above operate by receiving pressure oil supplied from the hydraulic circuit 40 shown in FIG. Specifically, the hydraulic circuit 40 includes a hydraulic source 42, and the hydraulic source 42 includes a motor-driven hydraulic pump 43. Electromagnetic direction switching valves 44 and 46 are disposed between the hydraulic source 42 and the pressure cylinder 18, and these electromagnetic direction switching valves 44 and 46 control supply and discharge of pressure oil to the pressure cylinder 18 by their switching operation. The piston rod 20 of the forging cylinder 18 is reciprocated.

An electromagnetic direction switching valve 48 is also disposed between the hydraulic pressure source 42 and the dimensioning cylinder 24. The electromagnetic direction switching valve 48 controls the supply and discharge of pressure oil to the dimensioning cylinder 24 by the switching operation. The piston rod 26 of the take-out cylinder 24 is reciprocated.
Further, an induction heating coil 50 is disposed between the forging punch 16 and the chuck device 8 so as to be concentric with the transfer path 2. When the induction heating coil 50 is in the state shown in FIG. To the region upstream of the transfer path 2. The induction heating coil 50 is electrically connected to a power supply (not shown) via a lead wire.

Next, the above-described chuck device 8 will be described.
As apparent from the chuck device 8 shown in the lower part of FIG. 1, the chuck device 8 includes a pair of chuck cylinders 52 _L and 52 _R. These chuck cylinders 52 _L and 52 _R are arranged on both sides of the transfer path 2 with the transfer path 2 in between, and have axes parallel to the transfer path 2. The chuck cylinder 52 _L, 52 _R is receiving member 53 for covering these outer peripheral surface partially, while being rotatably supported around an axis with respect to the chuck cylinder 52 _L, the chuck cylinder 52 _R is the receiving member 53 And is supported so as to be freely separated in a direction crossing the transfer path 2. That is, in this embodiment, the chuck cylinder 52 _R is freely movable in the horizontal direction.

The pair of chuck cylinders 52 _L and 52 _R are supported by end plates 55 on the upstream side of the transfer path 2 in the axial direction. The end plates 55 are chucks shown in the upper part of FIG. Shown in apparatus 8.
As is clear from FIG. 1, a chuck cylinder 54 is disposed on the side of the chuck cylinder 52 </ b> _R , and the chuck cylinder 54 includes a piston 56 that faces the chuck cylinder 52 </ b> _R. The piston 56 has a front end surface exposed toward the chuck cylinder 52 _R, the distal end surface is in contact with the receiving member 53 described above of the chuck cylinder 52 _R via the pressing member (not shown).

Moreover, the chuck cylinder 54 is provided with a pull rod 60, the pull rod 60 and the inner end 58 screwed into the receiving member 53 of the chuck cylinder 52 _R, projecting outwardly from the end wall forming the barrel of the chuck cylinder 54 A pull spring 62 made of a compression coil spring is bridged between the outer end and the outer cylinder. The pull spring 62 biases in a direction away of the piston 56 from the chuck cylinder 52 _R.

On the other hand, the chuck cylinder 54 is also connected to the hydraulic circuit 40 described above, and an electromagnetic direction switching valve 64 and a boost cylinder 66 are sequentially arranged between the hydraulic source 42 and the chuck cylinder 54 from the hydraulic source 42 side. The electromagnetic direction switching valve 64 controls supply / discharge of pressure oil to / from the boost cylinder 66 by the switching operation, and operates the boost cylinder 66.
When the boost cylinder 66 is operated in response to the switching operation of the electromagnetic direction switching valve 64 from the rest position (the position shown in the figure) to the operating position, the boost cylinder 66 supplies high-pressure oil to the chuck cylinder 54, thereby , the piston 56 of the chuck cylinder 54 via the pressing member and the receiving member 53, presses the chuck cylinder 52 _R from its rest position to the chuck cylinder 52 _L. Therefore, the pull rod 60 connected to the receiving member 53 resists the urging force of the pull spring 62 and is moved toward the chuck cylinder 52L together with the receiving member 53 while contracting the pull spring 62.

On the other hand, when the directional control valve 64 is returned to the rest position, the pull rod 60 is pulled back by the urging force of the pull spring 62, along with this, the receiving member 53 is pulled back with a chuck cylinder 52 _R, thereby The piston 56 of the chuck cylinder 54 and the piston of the boost cylinder 66 are also returned to the rest position.
2 to 4 show the chuck cylinders 52 _L and 52 _R in detail.

Since the chuck cylinders 52 _L and 52 _R have the same structure, the structure of the chuck cylinders 52 _L will be described below with a focus on one chuck cylinder 52 _L.
Chuck cylinder 52 _L is more on the outer peripheral surface thereof, has four chuck grooves 68a~68d in the case of the illustrated embodiment, these chucks grooves 68a~68d are exist at equal intervals in the circumferential direction of the chuck cylinder 52 _L Are arranged. Each chuck groove 68 forms a circular arc cross sectional shape, over the entire length of the chuck cylinder 52 _L, and extends along its axis.

As apparent from FIGS. 3 and 4, the sizes of the chuck grooves 68 a to 68 d, that is, their diameter dimensions are different from each other, and these diameter dimensions are enlarged in the order of the chuck grooves 68 a to 68 d.
Further, on an outer peripheral surface of the chuck cylinder 52 _L A number of transverse grooves 70 are formed to cross each chuck grooves 68, respectively, these transverse grooves 70 in the longitudinal direction of the chuck groove 68, i.e., the chuck cylinder 52 _L It is arranged at a predetermined interval in the axial direction, and extends over the circumferential direction of the chuck cylinder 52 _L at a predetermined rotation angle range. The depth of the transverse groove 70 is larger than the depth of the chuck groove 68.

Furthermore, the end face of the chuck cylinder 52 _L located at the end plate 55 side as described above, tapered surfaces 72 increase the diameter of the end portion of the chuck groove 68 respectively (see FIG. 4) is formed, the tapered surface 72 is the wire A Form a guide to guide the head of.
The pair of chuck cylinders 52 _L and 52 _R described above are arranged such that a pair of chuck grooves 68 corresponding to each other (that is, chuck grooves 68 having the same suffixes a to d) face each other across the transfer path 2. As can be seen from FIG. 1, the pair of chuck grooves 68 form a clamping passage 78 for the wire A in the middle of the transfer path 2. Here, the pair of chuck grooves 68 forming the clamping passage 78 is selected according to the outer diameter of the wire A, and the clamping passage 78 has an inner diameter that allows the insertion of the wire A. More specifically, when the chuck cylinders 52 _L and 52 _R are pressed against each other as described above, the holding passage 78 has an inner diameter substantially the same as the outer diameter of the wire A, and a desired friction between the chuck A and the wire A. Can be generated.

That is, when the wire A to the clamping passage 78 is inserted, only the chuck cylinder 54 mentioned above pushes the piston 56 about 1 mm, narrowed the axis distance between a pair of chucks cylinder 52 _L, 52 _R, a pair of chuck groove The wire A can be firmly clamped between the 68. At this time, the chuck grooves 68 are provided with the cross grooves 70 described above, and the pair of chuck grooves 68 are formed in the wire A in the longitudinal direction by the edges of the cross grooves 70 biting into the outer peripheral surface of the wire A. Thus, the wire A can be firmly chucked without causing sliding.

Further, as is clear from the above description, each chuck cylinder 52 is provided with a plurality of chuck grooves 68 of different sizes, so even a wire A having a different outer diameter can be interposed between a pair of selected chuck grooves 68. , The chuck becomes possible.
The pair of chuck cylinders 52 _L and 52 _R shown in the lower part of FIG. 1 is shown in a state having only one of the chuck grooves 68.

On the other hand, the pair of chuck cylinders 52 _L and 52 _R is connected to a rotating device 80 as rotating means, and the rotating device 80 will be described below.
The rotating device 80 includes a discharge cylinder 82 as a drive source. The discharge cylinder 82 is disposed below the pair of chuck cylinders 52 _L and 52 _R , and extends upward toward the chuck cylinders 52 _L and 52 _R. It has a rod 84. A rod end 86 is attached to the upper end of the piston rod 84, and the rod end 86 is connected to the chuck cylinder 52 on the corresponding side via link arms 88 and 90 one by one on the left and right.

More specifically, the upper link arm 90 is attached to a shaft 92, and this shaft 92 is connected to the corresponding chuck cylinder 52 via a plurality of connecting bolts (not shown). In FIG. 2, reference numeral 74 denotes a screw hole for the connecting bolt.
When the piston rod 84 of the discharge cylinder 82 is contracted from the state shown in the drawing, the rod end 86 is lowered, and this lowering is converted into the rotation of the corresponding chuck cylinder 52 via the pair of left and right link arms 88 and 90. The In this case, the pair of chuck cylinders 52 _L and 52 _R rotate in opposite directions so that the chuck groove 68 moves upward. Therefore, the pair of chuck grooves 68 forming the sandwiching passage 78 are separated from each other, thereby opening the sandwiching passage 78.

Thereafter, when the piston rod 84 of the discharge cylinder 82 is extended, the pair of chuck cylinders 52 _L and 52 _R are respectively rotated in the opposite directions, and the pair of chuck grooves 68 sandwich the transfer path 2, and the clamping passage 78 is again passed. Form.
Therefore, the clamping passage 78 can be opened and closed simply by rotating the pair of chuck cylinders 52 _L and 52 _{R so} that the separation distance between the pair of chuck grooves 68 exceeds the outer diameter of the wire A. It can be implemented.

  In order to extend and contract the piston rod 84 of the discharge cylinder 82 described above, the discharge cylinder 82 is also connected to the hydraulic circuit 40 described above, and an electromagnetic direction switching valve 94 is disposed between the hydraulic source 42 and the discharge cylinder 82. Yes. The electromagnetic direction switching valve 94 controls supply / discharge of pressure oil to / from the discharge cylinder 82 by the switching operation, and expands / contracts the piston rod 84 of the discharge cylinder 82.

If necessary, a proximity switch 96 is disposed in the vicinity of the piston rod 84, while a detection element 98 that turns the proximity switch 96 on and off is attached to the rod end 86. These proximity switches 96 and the detector 98, if the automatic operation of the forging machine is implemented, the operation of the discharge cylinder 82, i.e., is used to detect the rotation of the chuck cylinder 52 _L, 52 _R.

FIG. 5 shows the above-described chuck device 8 more specifically.
The left half of FIG. 5 shows a state where the piston rod 84 of the discharge cylinder 82 extends upward, and the right half of FIG. 5 shows a state where the piston rod 84 contracts downward.
As is clear from FIG. 5, the discharge cylinder 82 is attached to the attachment base 100 via the attachment base 102, and the piston rod 84 extends upward through the attachment base 102.

Rod-end 86 described above has a lifting table 104 connected to the upper end of the piston rod 84, the guide 106 is protruded from the side end of the lifting platform 104 located in the chuck cylinder 52 _L side. The guide 106 is composed of a bolt screwed into the lifting platform 104, and is guided up and down in the guide groove 110 of the guide bracket 108 as the rod end 86 moves up and down. The guide bracket 108 is erected from the mounting base 102.

Furthermore, the rod end 86 has left and right pin brackets 114 _L and 114 _R connected to the lower ends of the left and right link arms 88 via pins 112, and these pin brackets 114 _L and 114 _R are connected to the lifting platform 104. Mounted on top.
Here, the pin bracket 114 _L is fixed to the elevation frame 104, the pin bracket 114 _R is to freely contact and separation are supported on the lifting platform 104 relative to the pin bracket 114 _L. More specifically, as shown in FIG. 6, between the lifting table 104 and pin bracket 114 _R is the slide table 116 is provided, the pin bracket 114 _R smooth contact and separation with respect to the pin bracket 114 _L can do.

Furthermore, the pin bracket 114 in _L compression coil spring 118 is accommodated, the compression coil spring 118 is laid between the pin bracket 114 _L and the pin bracket 114 _R. The compression coil spring 118 urges the pin bracket 114 _{R in the} direction F away from the pin bracket 114 _L , so that the pin bracket 114 _R is pressed against the stopper 120 fixed to the lifting platform 104.

Since the pin bracket 114 _R is used for connecting the link arms 88 and 90 between the chuck cylinder 52 _R and the rod end 86, the chuck cylinder 52 _R described above is in contact with and separated from the chuck cylinder 52 _L. when the pin bracket 114 in conjunction with the movement of the chuck cylinder 52 _{R R} also with the aid of the compression coil spring 118 can contact and separation with respect to the pin bracket 114 _L, rod end 86 of the chuck cylinder 52 _R contact The separation movement, that is, the above-described chucking operation of the wire A is not hindered.

  Referring again to FIG. 5, the lift device 122 is disposed on the upstream side of the above-described chuck device 8 as viewed in the transfer path 2, and the lift device 122 includes a wire rod 124. The wire receiver 124 has a receiving surface having an arc shape when viewed in a vertical cross section at an upper portion thereof. The wire A can be supported by the receiving surface, and a rest position immediately below the transfer path 2 and the transfer path 2 are supported. It is possible to move up and down between the operating positions above.

More specifically, as apparent from FIG. 7, a guide shaft 126 extends downward from the wire rod holder 124, and the guide shaft 126 is slidably inserted into a hollow guide pipe 128. The guide pipe 128 is erected from the mounting base 100 described above.
On the other hand, as shown in FIG. 5, a pair of link arms 130 and 132 extend from the left and right lower portions of the wire rod holder 124, respectively, and the tip thereof, that is, the tip of the link arm 132 is the aforementioned chuck device. 8 are connected to each other via link members 134 shown in FIG.

  Accordingly, when the left and right link arms 90 of the chuck device 8 are rotated so as to open the clamping passage 78 described above, the rotation of the link arms 90 causes the wire receiver 124 to move to its rest position via the link arms 130 and 132. Lift to the upper working position. That is, the lift device 122 can move the wire rod 124 up and down using the discharge cylinder 82 of the chuck device 8 as a common drive source.

In FIG. 7, reference numeral 136 indicates a cover surrounding the chuck device 8 and the lift device 122. The cover 136 has an end face 138 facing the upstream side of the transfer path 2, and the end face 138 has a substantially U-shaped inlet opening 140 at the top thereof, as shown in FIG. It extends through the inlet opening 140.
In addition, a V-shaped wire guide 144 is disposed on the upstream side of the inlet opening 140, and this wire guide 144 is attached to the end surface 138 of the cover 136 via a bracket 142. Further, mounting plates 146 are respectively attached to the end surface 138 on both sides of the inlet opening 140, and these mounting plates 146 have a rotation gate 148 at the end on the inlet opening 140 side. The rotation gate 148 is rotatably supported by the mounting plate 146, is urged to rotate in a direction in which the rotation coil spring 150 abuts with each other, and covers the transfer path 2 from above. The tension coil spring 150 is stretched between the rotation gate 148 and the mounting plate 146.

Next, the operation of the aforementioned forging machine will be described with reference to FIG.
In FIG. 10, for the convenience of drawing, the postures of the rotating device 80 and the pair of pinch rollers 6 are shown in a state different from the actual posture.
FIG. 10A shows a state in which the piston rod 26 of the measuring cylinder 24 in the upsetting device 4 is extended by a predetermined length. As the piston rod 26 extends, the piston rod 26 pulls out the plunger 14 of the upsetting device 4 toward the chuck device 8 via the arm 28, whereby the forging punch 16 and the clamping passage 78 of the chuck device 8. A predetermined interval is secured in between. In this case, the extension length of the measuring cylinder 24 can be adjusted by the thickness of the spacer provided at the tip.

  On the other hand, when in the state shown in FIG. 10A, the wire A has already been transferred from the transfer device toward the upsetting device 4, and after passing through the clamping passage 78 of the chuck device 8, one end of the wire A 16 is in contact with the tip. That is, the transfer of the wire A is stopped when one end of the wire A comes into contact with the tip of the forging punch 16, and one end of the wire A protrudes from the holding passage 78 by a certain length and is surrounded by the induction heating coil 50 described above. It is in the state.

When the wire A comes into contact with the forging punch 16 (FIG. 10 (a)), a signal is output from a switch circuit (not shown), and the chuck cylinder 54 is operated in response to this signal output, while the dimensioning cylinder 24 is While being contracted, the induction heating coil 50 is energized from the power supply, and one end of the wire A is rapidly heated to a predetermined temperature (FIG. 10B).
As described above, the chuck cylinder 54 pushes the chuck cylinder 52 _R toward the chuck cylinder 52 _L , so that the wire A in the clamping passage 78 is clamped between the pair of chuck grooves 68 that form the clamping passage 78. That is, the wire A is firmly chucked between the chuck cylinders 52 _L and 52 _R.

Here, since the pressing stroke of the piston 56 in the chuck cylinder 54 is about 1 mm as described above, the chucking operation of the wire A between the chuck cylinders 52 _L and 52 _R is performed quickly.
When one end of the wire A reaches a predetermined heating temperature, the measuring cylinder 24 brings the forging punch 16 into contact with one end of the wire A (FIG. 10c). Thereafter, the forging cylinder 18 is actuated, and the plunger 14 is rapidly pushed out toward the one end of the wire A together with the forging punch 16 via the piston rod 20, and the forging punch 16 installs one end of the wire A and expands it. It forms in the diameter upset end B (FIG.10 (d)). At this time, the pressing of the forging punch 16 causes the compression coil spring 32 of the measuring cylinder 24 to contract. At this time, the encoder 38 measures the pushing amount after the forging punch 16 abuts on one end of the wire A, that is, the upsetting amount.

When the installation is completed, the operation of the chuck cylinder 54 is released, and the tightening of the wire A by the pair of chuck cylinders 52 _L and 52 _R is released. Thereafter, the forging cylinder 18 is further operated and the forging punch 16 is passed through. The set-up end B of the wire A is pushed back toward the pair of chuck cylinders 52 _L and 52 _R (FIG. 10E). Such pushing of the upsetting end B causes the upsetting end B to escape from the induction heating coil 50.

Thereafter, the rotation device 80 as shown in FIG. 10 (e), i.e., the discharge cylinder 82 is actuated, the chuck cylinder ₅₂ L, 52 _R are rotated in opposite directions. Therefore, the clamping passage 78 formed between the pair of chuck grooves 68 is opened as described above, and at the same time, the lift device 122 is operated and the wire rod 124 is raised. Therefore, the wire A is received by the wire receiver 124 and lifted to the upper position together with the wire receiver 124. At this time, a sufficient space is secured between the upsetting end B of the wire A and the pair of pinch rollers 6, and the portion on the upsetting end B side of the wire A is lifted with bending, and the chuck cylinder It is possible to slip out to an upper position outside the outer peripheral surfaces of 52 _L and 52 _R. Here, the upper position indicates a position where the upsetting portion B of the wire A is outside the outer circumferences of the chuck cylinders 52 _L and 52 _R.

As described above, since the rotation angle required for the chuck cylinders 52 _L and 52 _R is small, the wire A can be lifted from the clamping passage 78 quickly, and as a result, the chuck cylinder 54 described above is obtained. As a result, the operating speed of the chuck device 8 can be increased.
When the wire A is lifted together with the wire receiver 124, the wire A is also lifted from the wire guide 144 described above. At this time, the wire A moves the pair of rotating gates 148 to their tension coil springs. It can be lifted up by rotating upward against the urging force of 150 and can be lifted regardless of the presence of the turning gate 148.

Thereafter, when the pinch roller 6 described above is operated, the wire A is transferred without causing the upset end B of the wire A to interfere with the chuck cylinders 52 _L and 52 _R , the wire receiver 124, the rotation gate 148 and the like. It can be pulled back along the path 2 (FIG. 10 (f)).
Here, as shown in FIG. 10 (f), the transfer device is provided with a whisker-like detected element 152 and a limit switch 154 immediately upstream of the pair of pinch rollers 6, and the upsetting end B of the wire A Passes through the detection element 152, the detection element 152 is released from the wire A, and the limit switch 154 is turned on. In response to this ON operation, the pair of pinch rollers 6 are separated from each other so as to allow the passing of the upset end B as shown in FIG. While A is moved from the transfer path 2 toward the subsequent stage (not shown), a new wire A is supplied to the transfer path 2, and the forging cylinder 18 and the lift device 122 are respectively shown in FIG. The forging machine repeats the forging described above for the new wire A.

As apparent from FIG. 10A, when the wire A is transferred toward the chuck device 8 and passes through the pair of pinch rollers 6, the wire A comes into contact with the detection element 152 and is detected. The child 152 is separated from the limit switch 154, and the limit switch 154 is turned off.
Since the forging machine described above includes the chuck device 8 whose operation is speeded up, the upsetting process to the one end of the wire A can be performed quickly, and the productivity of the processed wire A is greatly improved. be able to.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, the specific structures of the chuck device and the forging machine according to the present invention can be arbitrarily changed without departing from the gist of the present invention. It can be similarly applied to the above processing apparatus, and the wire is not limited to the PC steel bar.

It is a block diagram which shows schematically the forging machine of one Example with the hydraulic circuit. It is a figure which shows a chuck cylinder partially fractured | ruptured. It is the figure which showed the end surface by the side of the induction heating coil of the chuck cylinder of FIG. It is the figure which showed the end surface by the side of the transfer apparatus of the chuck | zipper cylinder of FIG. It is a side view which shows the rotation apparatus and lift apparatus of the chuck | zipper apparatus of FIG. 2 in detail. It is a figure which shows the rod end of the rotating apparatus of FIG. 5 in detail. FIG. 6 is a front view showing the rotating device and the lifting device of the chuck device of FIG. It is the figure which showed the mechanism which makes a rotation apparatus and a lift apparatus interlock | cooperate. In FIG. 7, it is an arrow line view which follows the IX-IX line. It is the figure which showed the operation | movement procedure of the forging machine of one Example in the order of (a)-(g).

Explanation of symbols

2 Transfer path 4 Upsetting device 8 Chuck device 52 _L , 52 _R Chuck cylinder 54 Chuck cylinder (tightening means)
68a to 68d Chuck groove 70 Transverse groove 78 Nipping passage 80 Rotating device (rotating means)
82 Discharge cylinder (drive source)
122 Lifting device (lifting means)

Claims (6)

A pair of chucks arranged on both sides of a wire transfer path, each having an axis extending along the transfer path, and rotatably supported around the axis and relatively close to and away from the transverse direction of the transfer path A cylinder,
A pair of chuck grooves formed on the outer peripheral surfaces of the pair of chuck cylinders so as to face each other with the transfer path interposed therebetween, and securing a holding path for the wire rod in the middle of the transfer path;
Wherein the pair of chuck cylinder taken away relatively against the said transverse direction, and tightening clamping means the wire in the clamping passage in between the chuck grooves when the pair of chuck cylinder is close,
Rotating means for rotating the pair of chuck cylinders in opposite directions and reciprocating the pair of chuck grooves along the circumferential direction of the corresponding chuck cylinder, thereby expanding or reducing the separation distance between the pair of chuck grooves;
A wire rod chuck device comprising:   2. The wire chuck device according to claim 1, wherein each chuck cylinder has a plurality of chuck grooves which are formed to be spaced apart from each other in the circumferential direction and have different sizes.   The wire rod according to claim 1, further comprising a plurality of transverse grooves formed on an outer peripheral surface of each chuck cylinder and transverse to the chuck groove and spaced apart in the axial direction of the chuck cylinder. Chuck device. The transfer path extends horizontally;
2. The apparatus according to claim 1, further comprising lift means for lifting the wire on the transfer path upward from between the pair of chuck cylinders when the separation distance between the pair of chuck grooves is expanded. The wire chuck apparatus according to any one of?   The wire chuck apparatus according to claim 4, wherein the rotation unit and the lift unit include a common drive source. A wire chuck device according to claim 4 or 5,
The wire rod is disposed in front of the chuck device as viewed in the transfer direction of the wire rod, and the one end portion of the wire rod is installed in a state in which one end portion of the wire rod projects from the pair of chuck cylinders and the wire rod is chucked on the chuck device. A wire rod forging machine, characterized by comprising an upsetting device for expanding the diameter of the wire.

Images