JPH0127803B2 - - Google Patents

Description

Detailed Description of the Invention The present invention converts the rotational force of the winding drum into tensile force by the frictional force between the winding drum and the wire having a predetermined number of turns wound around the rotating winding drum. do,
The present invention relates to a method for releasing a grip on a wire rod in a winding drum when the wire rod is continuously passed through a peeling die to be peeled, and a slow release type wire chuck.

When stripping the wire through a stripping die,
For example, as shown in FIG. 1, the wire 1 is first passed through a drawing die, A, to obtain roundness of the wire by surface reduction, and then passed through a stripping die, B, to be stripped.
This method is then passed through a guide chip. In order to make the wire 1 pass through the die described above, the wire must be pulled in the direction of the arrow with a strong tensile force F that exceeds the pulling force plus the peeling force. One of the means for applying the tensile force F to the wire 1 is the method shown in FIGS. 2a to 2c. Second
In Figure a, a wire rod 1 whose tip length is made thinner than the blade diameter of a peeling die by tipping is passed through a peeling tool 2 including a peeling die, and is installed on the lower circumferential surface of a winding drum 4 with a guide roll 3 as a guide. The tip of the wire is gripped by the wire chuck 5. By operating a drive source (not shown), the winding drum 4
is rotated in the direction of arrow a, and the wire rod 1 whose end is fixed with the wire chuck 5 is rotated in the direction of arrow a, and the wire rod 1 whose end is fixed with the wire rod chuck 5 is rotated in the direction of arrow a.
It is wound up sequentially from the lower circumferential surface to the upper circumferential direction. At the start of winding, the tip of the wire rod 1 is held by the wire chuck 5, so the rotational force of the winding drum acts directly as a tensile force on the wire rod 1, but the number of windings of the wire rod 1 around the winding drum increases. Therefore, the frictional force between the wire 1, which is under tension due to back tension, and the circumferential surface of the winding drum increases, and when a certain number of turns is reached, the frictional force increases even if the end of the wire is not gripped by the wire chuck 5. It becomes possible to convert the rotational force of the winding drum into a tensile force F to the wire rod 1. At this point, it is necessary to maintain a uniform finishing precision in peeling, so as a means of keeping the tensile force F and the tensile speed constant, it is necessary to set the number of windings of the wire around the winding drum to a constant number. That is, the grip on the end of the wire rod 1 that has been gripped by the wire chuck 5 is released, and the number of turns at the tip corresponding to the number of turns to be wound subsequently is sequentially pulled out from the winding drum.
More specifically, when the number of windings of the wire 1 around the winding drum 4 reaches a predetermined number, the pinch roll 6, which has been waiting at a position away from the circumferential surface of the winding drum 4, is moved toward the winding drum 4. Then, as shown in FIG. 2b, after pressing a plurality of windings below the number of wire rod windings to be secured in the circumferential direction of the winding drum 4, the wire rod chuck 5 is pressed.
By releasing the grip on the end of the wire rod 1, as the winding drum 4 rotates, the wire rod 1 is slightly moved downward by the number of windings corresponding to the newly wound wire rod as shown in FIG. 2c. Move one by one and pinch roll 6
It is separated from the winding drum 4. In this case, releasing the grip of the wire 1 by the wire chuck 5 is as follows:
For example, when drawing wire rods, there is no problem in stopping the rotation of the winding drum. Failure may occur. This is because, as shown in Figure 1, the inner cross section of the plastic tool, the drawing die (a), has a gentle parabolic cross-section, whereas the peeling die, (b), the cutting tool, has an acute cutting edge. Therefore, if the progress of the wire is stopped once during the stripping process and then restarted,
As shown in the figure, the strong tensile force concentrates on the cutting edge of the stripping die (B) that bites into the wire rod 1, causing the blade to spill, and there is a high risk that the stripped wire material will be damaged after restarting, resulting in a defective product. . Particularly when stripping large-diameter steel wires, the stripping is performed with a strong back tension in place, so the edge of the stripping die is bound to spill. It is essential to do it inside.

An example of a wire chuck that can release the wire grip during operation is shown in FIG. 3. This wire chuck consists of a pedestal 7 with a U-shaped cross section on which the wire 1 is placed, a claw 18, and a claw holder 19.
and a claw presser support 20.
The upper surface of the claw 18 is an inclined surface 182 whose height is lowest on the left side in FIG. 3a and gradually increases in height toward the right side. The lower surface of the claw 18 faces the inner bottom surface of the pedestal 7, and serves as an engaging surface 181 for increasing the locking force of the wire placed therebetween. The lower surface of the claw presser 19 is an inclined surface 191 that is compatible with the inclined surface 182 of the upper surface of the claw 18. The claw presser support 20 is a roller support member 20
1 supports the roller 202, and the beam 1 of the frame 11
Supported by 11.

After placing the wire 1 on the inner bottom surface of the pedestal 7, the claw 18 is driven as a wedge between the claw holder 19 and the wire 1, and the claw 18 is moved in the direction of arrow P by the roller 202 via the claw holder 19. Press and claw 18
The wire rod 1 is held by the cradle 7. By applying the impact force S shown in FIG. 3B to the roller support member 201 of the pawl presser roller support 20, it is displaced to the position shown in FIG. 3C. As a result, the pressing force P on the claw presser 19 is released all at once, and the wire rod 1
grip is released.

However, when a wire chuck configured to release the grip on the wire all at once is used to strip high-strength, especially large-diameter steel wire, a strong back tension is applied to the wire in front of the drawing die. Since the wire is wound in a twisted state, the wire has a high tensile force F.
When the grip is suddenly released, the tension is contracted all at once, and the shock generated by the contraction is extremely large. The impact may be applied even if the number of windings of the wire rod on the winding drum is a predetermined number of windings that includes an allowance greater than the number of windings that can convert the rotational force of the winding drum into a tensile force F on the wire rod, and is necessary for the above conversion. Even if the pressing force of the pinch roll that comes into contact with the end winding part of a certain number of windings is made so large as to affect the rotation of the winding drum and to the extent that there is a risk of flaws occurring in the stripped wire, Rapid unwinding occurs in the winding section beyond the pinch roll, resulting in an expansion of the winding diameter.Frictional force does not work between the wire rod and the circumferential surface of the winding drum, and the tensile force F on the wire rod becomes 0. As a result, the peeling process virtually stops at this point. This does not satisfy the above-mentioned requirement to release the grip on the wire during the stripping operation. To prevent this, the number of turns of the wire wound around the winding drum should be made sufficiently large to prevent unwinding from reaching a predetermined number of turns, and the tensile force can be obtained by the frictional force of the wire of the predetermined number of turns. However, increasing the length of the winding drum increases the size of the equipment, which is not preferable.

The present invention has been made in order to solve the above-mentioned problems that exist in the conventional wire rod grip release method, especially when peeling a large diameter steel wire rod.

The present invention will be explained according to the embodiment shown in FIGS. 4a to 4c.

In the present invention, the number of turns of the wire rod 1 wound around the circumference of the winding drum 4 can be converted into the tensile force of the wire rod by the rotational force of the winding drum 4 by the frictional force between the circumferential surface of the winding drum and the wire rod 1. The process is the same as the conventional method until the pinch roll 6 moves forward and presses the wound wire 1 on the circumference of the winding drum 4 after reaching a predetermined number including a margin.

The features of the present invention reside in a method for releasing the gripping force on the end of the wire rod 1 gripped by the wire chuck 5, and a configuration for that purpose.

An example of a preferred chuck in the present invention is shown in the fourth example.
This will be explained according to Figures a to c.

The wire chuck constitutes an outer enclosure by connecting a holder for the wire 1 with a square cross section located below and a frame 11 located above. The frame body 11 has two sections with a slight deviation from each other on almost both sides of the lower part of the cross-sectional shape.
It consists of steps that expand outward in the horizontal and vertical directions. The lower surface 113 on the left side of the outer circumference of the frame 11 in FIG.
12 is set so that a block 86 of a claw 8, which will be described later, can be positioned below it with some room. The opening surfaces of the pedestal 7 and the frame 11 are shifted by 90 degrees. A cylinder 12 is attached to the inner upper surface of the frame 11, and the rod 13 of the cylinder 12 is located on the vertical center line of the nail presser truck 9, and its lower end is connected to the center of the upper surface of the nail presser truck 9. .
The pawl presser carriage 9 is configured to be movable up and down along the inside of the cross-sectional member of the frame 11 as the cylinder rod 13 moves forward and backward. Cylinder 12 is preferably pneumatically controlled, 14 is an air supply source, 15 is a switching solenoid valve, 16 is an air-oil converter, 1
7 indicates a throttle valve, and 18 indicates a control valve.

The lower surface of the claw presser carriage 9 is an inclined surface 92 that slopes upward from the left end to the right end in FIG. The presser rollers 10a, 10a, which are freely rotatable as shown in FIG.
A freely rotatable presser roller 10b is similarly attached to a predetermined position on the longitudinal center line of the inclined surface 92 passing through the midpoint between the presser rollers 10a, 10a. The distance l between the line connecting the axes of the presser rollers 10a and the axis of the roller 10b is set to be the same as the length L in the longitudinal direction of the upwardly inclined portion of the claw 8, which will be described later. Note that l and L are set to be greater than or equal to the contracted length of the wire, which will be described later. A claw 8 is used as a wedge between the wire rod 1 placed on the inner bottom surface along the opening of the pedestal 7 and the claw holding cart 9. As shown in detail in FIG. 4c, the claw 8 has a lower surface formed almost parallel to the opposing outer circumferential surface of the wire rod 1 placed on the pedestal 7, and has a mating surface 81 in FIGS. 4a and 4c. It's summery. The upper surface of the left part is an upwardly inclined inclined surface 821 that almost matches the inclined surface 92 of the lower surface of the claw presser truck 9, and the upper surface that follows it holds the highest part of the upper inclined surface 82.
After forming a parallel surface 83 that is substantially parallel to the lower surface, a grip portion 86 is formed as a parallel surface that descends vertically at the right end. A protrusion 822 is formed on the parallel surface 83 at a certain width on the longitudinal center line of the claw 8, more specifically at a position where the above-mentioned roller 10b can rotate on the upper surface. The protruding portion 822 has an upper surface connected to the inclined surface 821 and a sloped portion 84 formed to be on an extension line of the inclined angle of the sloped surface 821, and a sloped portion 84 that is connected to the sloped portion 84 and whose upper surface is the uppermost part of the sloped portion 84. It consists of a flat part 85 formed parallel to each other while maintaining a height of . In this case, when the claw 8 moves to the left in FIG. 4c, the rollers 10a, 10a
are along the corresponding parallel surfaces 83 located on both sides of the protrusion 822, and the roller 10b is
5 can be moved.

Here, the lengths of l and L in the claw 8 will be explained in more detail.

As mentioned above, in practice, in order to ensure that the rotational force of the winding drum 4 is reliably converted into tensile force when the wire rod 1 is released from the grip of the chuck 5, the number of windings of the wire rod 1 on the winding drum 4 is determined. is set to a predetermined number of windings with a margin greater than the minimum value for generating the necessary frictional force, and the lengths of l and L are such that the wire rod 1 is stretched by tensile force to a length equivalent to the number of windings for the margin. The length is set to slightly exceed the length.

In such a configuration, when gripping the wire rod 1, the cylinder 12 is driven to move the rod 13 sufficiently backward, the claw presser carriage 9 is displaced above the frame 11, and the tip of the wire rod 1 is guided. Using 113, cradle 7 and claw 8 which is in free state
Insert between. Next, using the knob 86, the claw 8 is pulled toward the right wall of the enlarged portion of the frame 11 in FIG. Along with this, the claw presser carriage 9 descends, and the presser roller 10
The claw 8 is pressed from the direction of the inclined surface 82 through the wire rod 1 to bring it into the state shown in FIG. In this state, the presser rollers 10a, 10a are attached to the inclined surface 8 of the claw 8.
2, and 10b is located at the center near the boundary between the inclined surface 82 and the inclined portion 84.

When the wire rod 1 reaches a predetermined number of turns including the above-mentioned margin, air is gradually injected into the rod retraction compartment of the cylinder 12 to cause the rod 13 to retract at a very slow speed. As a result, the claw presser carriage 9 connected to the tip of the rod 13 rises at a very slow speed along the inner wall of the frame 11. By increasing the slow speed of the claw holding cart 9, the pressing force of the claws 8 against the wire 1, which had been firmly pressing the wire 1 against the cradle, is gradually reduced. However, since the wire is in an elongated state at the time when the grip on the wire is to be released, a force is applied to the wire to contract it in the direction of arrow R due to the decrease in the pressing force, and as a result, the wire is in an elongated state. tries to move in the R direction together with the engaged claw 8. Since the presser roller 10 of the claw presser cart 9 is in contact with the inclined surface 82 of the claw 8, the movement of the claw 8 to the left causes the presser rollers 10a, 10a to press the inclined portion 82, and the presser rollers 10b to press the inclined portion 84. rise. Since the claw holding cart 9 moves up along the frame 11 at a very slow speed, the wire 1 moves up the claw 8 under the wedge effect caused by the rise of the inclined surfaces 82 and 84 of the claws 8 of the holding roller 10. While it is firmly held by the cradle 7, its contraction is gradually performed. The contraction is the expansion caused in the wire rod 1 with the above-mentioned margin, that is, the contraction of the elastic deformation regarding the length, and the wire rod 1 with the surplus length is wound around the winding drum 4 under tension. The elastic deformation caused by the bending due to the bending is still held by the claw 8, so the internal stress corresponding to the contraction of the elastic deformation related to the length is released, and is not manifested. do not. In other words, the wire rod 1 below the vinyl roll 6 maintains substantially close contact with the winding drum 4.

Further, the rollers 10a and 10b continue to rise, and when they reach a point slightly before the length setting positions of L and L, the contraction of the margin wire 1, that is, the elastic deformation related to the length has already been completely released. Exhausted. However, the release of the elastic deformation related to bending does not occur before this point.

When the rollers 10a and 10b rise after the length-related elastic deformation is completely released, the elastic deformation related to the bending of the surplus wire is partially released, and the winding portion of the wire with pinch roll 6 or less is 1 and the winding drum 4 are loosened.

Next, the rollers 10a, 10b move to the parallel parts 83, 8
At the point when it moves to 5, the claw 8 by the cylinder 12
The pressing force on the wire becomes 0, and as a result, the wire 1 is completely released from the grip by the claws 8, causing the wire 1 to behave in an attempt to completely release the residual elastic deformation due to bending. This behavior manifests as a springback phenomenon in which the wire 1 from the pinch roll 6 to the tip portion attempts to draw an arc larger than the outer diameter of the winding drum 4, and as a result, the position of the tip of the wire moves backward. The tip of the wire, which was located between the pedestal 7 and the engaging surface 81, slides between the pedestal 7 and the engaging surface 81, expands the arc, and escapes from the chuck 5. At the moment of escape, the residual elastic deformation is completely released.

In the present invention, the impact caused by the springback at the time when the springback phenomenon occurs does not affect the wire winding portion located above the pinch roll 6. This is because the elastic deformation related to length has been completely released before the springback phenomenon occurs, and the elastic deformation related to bending has also been partially released, so both elastic components This is because the sudden release of everything at once is not triggered. That is, the springback phenomenon that occurs is limited to the release of residual elastic deformation due to bending, and the impact is extremely weak. Therefore, it is sufficient that the pressing force of the pinch roll 6 has a predetermined pressing force that does not affect the rotation of the take-up roller 4 and does not cause damage to the stripped wire material, and is sufficient to pull the rotation of the take-up drum 4. A sufficient amount of frictional force is ensured to be converted into force.

In addition, normally, the wire rod 1 to be subjected to peeling etc. is wound on the winding drum 4 with a diameter exceeding its elastic limit, and the wire rod falling away from the restraint of the chuck 5 is plastically deformed. remain. Thereafter, the wire is wound on the winding drum 4 one after another due to the frictional force between the wire and the winding drum 4, and as a result, the wire is sequentially wound over a predetermined number of windings while being held down by the pinch rolls 6. It is made to separate from the pick drum 4. When the stripping of the wire progresses and the rear end of the wire passes through the stripping die, the tension in the wire section disappears, thereby completing the process according to the present invention.

According to the invention, the chuck on the wire is released in two stages. That is, in the first stage, the wire rod gripping position on the circumference of the winding drum was gradually changed within a predetermined range l in the longitudinal direction of the wire rod while the wire rod was firmly gripped, and as a result, the shrinkage of the wire rod was smoothly absorbed. It is distinctive in that it adopts a gradual release method in which the wire grip is released only at the second stage. Therefore, the present invention applies when a hard material such as a steel wire, particularly a large-diameter steel wire, is subjected to a strong back tension, so that it is necessary to strip the wire while applying a strong tensile force. If the wire chuck is used to release the chuck on the wire rod, most of the above-mentioned problems that have conventionally existed in this type of peeling can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an example of a wire stripping method, FIG. 2 is a diagram for explaining an example of a wire winding method in a conventional wire stripping device, and FIG. Front view at the start of cutting, Figure 2b
2 is a front view showing the state when a predetermined number of turns have been wound, FIG. A partially sectional front view showing an example of a conventional wire chuck, FIG. 3b is taken along A-A in FIG. 3a.
A line sectional view, FIG. 3c, is a sectional view showing the state when the wire chuck is released in FIG. 3b, and FIG. 4a.
4B is a partially sectional front view showing an embodiment of the present invention, FIG. 4B is a sectional view taken along the line B-B of FIG. 4A, and FIG. FIG. 3 is a perspective view showing the mechanical relationship of rollers attached to the presser truck. A... Drawing die, B... Peeling die, 1...
Wire rod, 4... Winding drum, 7... cradle, 8...
Claw, 81...meshing surface, 821...upward inclined surface,
822... Parallel part, 84... Inclined part, 85... Parallel part, 9... Claw holder cart, 92... Lower inclined surface of claw holder, 10a, 10b... Roller, 12...
…Cylinder.

Claims (1)

[Scope of Claims] 1. The winding drum 4 is wound by the frictional force between the winding drum 4 and the wire 1 which is wound around the rotating winding drum 4 and has been stretched a predetermined number of times. When the rotational force of 4 is converted into a tensile force on the wire 1 and the wire 1 is continuously passed through a drawing die and then through a peeling die 2 to be stripped, the tip of the wire 1 is placed on the circumference of the winding drum 4. to start winding.
When the number of windings of the wire rod 1 on the winding drum 4 exceeds the number that can ensure the above-mentioned frictional force and reaches a predetermined number set including the margin, the wire rod 1 is gripped by the margin wire 1. A method for releasing a grip on a wire rod in a winding drum of a wire peeling device, characterized in that the wire rod grip is released after gradually absorbing and contracting the elongation of the wire rod, and releasing a part of the elastic force. 2 The rotational force of the winding drum 4 is applied to the wire rod 1 by the frictional force between the wire rod 1 which is wound around the rotating winding drum 4 and has been stretched a predetermined number of times, and the winding drum 4. A wire chuck 5 is used when the wire rod 1 is continuously passed through a drawing die and then through a peeling die 2 to peel the wire rod by converting the tensile force into a tensile force against the wire rod. , a linear movement mechanism such as a claw holding cart 9 for pressing the wire 1 through the claw 8 and a cylinder 12 for vertically displacing the claw holding cart 9, and the lower surface of the claw 8 is placed on the cradle 7. A mating surface 81 is formed to be able to mesh with the outer periphery of the upper surface of the tip of the wire rod, and the upper surface thereof includes an upper slope surface 821 that slopes upward from the insertion side end of the wire rod 1 to the other end. A parallel portion 83 that maintains the height of the highest portion is formed, and the parallel portion 83 of the highest portion is formed.
At the longitudinal center portion of the slanted portion 84 , the upper surface is on an extension line of the inclination angle of the upper inclined surface 821 and has an inclined surface length L that is slightly shorter than that of the upper inclined surface 821 . and a parallel part 85 that maintains the height of the highest part of the inclined part connected thereto. Freely rotating rollers 10a, 10a and 10 are placed at symmetrical positions at both ends in the longitudinal direction of the lower end of the lower inclined surface of the claw presser carriage 9, and at the center of the upper end thereof, so that their circumferential surfaces protrude from the lower inclined surface.
b, and the distance l between the line connecting the axes of the rollers 10a, 10a at the lower end and the axis of the roller 10b at the center is set to be the same as the length L of the inclined part of the claw, and when gripping the wire 1, the claw presser is used. The lower end rollers 10a, 10a of the cart 9 are connected to the lower end of the upper inclined surface 821 close to the wire insertion side of the claw 8, and the upper end roller 10b is connected to the upper inclined surface 821 of the claw 8 and the inclined part of the protrusion. A loose release type wire chuck, which is located near the boundary with
However, when the pressing force of the claw 8 against the tip of the wire rod 1 wound on the winding drum 4 is gradually released by increasing the slow speed of the claw holding cart 9 due to the operation of the linear motion mechanism 12, During the predetermined number of windings, which includes an allowance in which the frictional force between the wire material 1 and the winding drum 4 exceeds the number of windings necessary to convert the rotational force of the winding drum 4 into a tensile force on the wire material 1, The length is slightly longer than the contracted length of the surplus wire rod 1.