JPH0919804A - Guide bushing for wire processing and machining device equipped with guide bushing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce material selecting works prior to processing and prevent detective of a product resulting from twist of wire by enlarging an allowable width for dispersing wire diameter in a guide bushing for in wire processing. SOLUTION: A chuck 32 is accommodated in an outside sleeve 31, and a spring washer 34 is interposed between a locating nut 33 to be engaged by the chuck 32 and the outside sleeve 31. Dispersion in a diameter of wires 10 is absorbed by resilience of the washer 34, and the wire 10 is retained by fastening force lying within the specified range. The front extremity F of the slope 32a of the chuck 32 is positioned behind the front extremity G of the slope 31a of the outside sleeve 31, and the resisting force against a stress given by a cutter, etc., is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide bush for processing a wire rod and a cutting machine equipped with the same, and more particularly to an improved guide bush structure for increasing the processing efficiency of the wire rod.

[0002]

2. Description of the Related Art Conventionally, when accurately processing a metal wire rod, as shown in FIG. 6, a guide is provided between a portion of the wire rod 10 mounted on a main shaft 11 and a portion processed by a cutting tool 12. The bush 20 may be provided. The guide bush 20 is attached to the frame 13 fixed to the processing device via the holder 14 and the attachment sleeve 15. When processing, wire 1
By inserting and supporting 0, the wire rod 10 is prevented from vibrating or being displaced.
Here, the fixing nuts 16 and 17 are respectively the holder 1
4 and the mounting sleeve 15 are for fixing to the frame 13.

The guide bush 20 has an outer peripheral sleeve 21 provided on the outer side, a chuck 22 fitted inside the outer peripheral sleeve 21, and a female threaded portion 22c provided on the rear end of the chuck 22. The positioning nut 23 is provided with a screw portion 23a.

The chuck 22 has three radially formed slits on the front end side thereof, and the front end portion is divided into three around the axis by the slits. Outer sleeve 2
The inclined surface 21a formed at the front end of the chuck 1 abuts the inclined surface 22a provided at the front end of the chuck 22,
2 moves in the axial direction with respect to the outer peripheral sleeve 21, so that the insertion hole 22b formed at the center of the chuck 22
The inner diameter of is increased or decreased.

The guide bush 20 includes a positioning nut 2
3 is screwed in to bring the end surface 23b of the positioning nut 23 into contact with the rear portion 22d of the outer peripheral sleeve 21,
The chuck 22 is set such that the inner diameter of the chuck 22 matches the outer diameter of the wire 10. Here, the positioning nut 23 positions the chuck 22 in the axial direction so that the insertion hole 22b of the chuck 22 holds the wire 10 with an appropriate force. here,
As the positioning nut 23, a nut with a slot is usually used.

The wire 10 has an insertion hole 2 for the guide bush 20.
The guide bush 20 receives the stress received from the cutting tool 12 at the time of cutting, and the guide bush 20 retains its position.

[0007]

However, in the above-mentioned conventional guide bush, since the inner diameter of the insertion hole 22b is fixed to a predetermined set value, the variation of the outer diameter of the wire rod 10 causes the set value to be smaller than the set value. If a wire rod 10 having a large outer diameter is used, the tightening force of the chuck 22 with respect to the wire rod 10 becomes excessive, the wire rod 10 does not rotate smoothly according to the spindle 11, and the wire rod 10 may be twisted. is there. The twist of the wire rod 10 causes a processing defect such as an abnormal tooth profile. Further, when the outer diameter of the wire rod 10 becomes smaller than the set value, the tightening force of the wire rod 10 by the chuck 22 becomes insufficient and the wire rod 10 is insufficiently held. It causes a positional shift, which also causes processing defects.

Therefore, conventionally, before the processing of the wire rod 10, it was necessary to separately perform material selection in order to keep the outer diameter of the wire rod 10 within the allowable range of the guide bush 20. For this material selection, it is necessary to separate the degree of variation in the outer diameter of the wire rod 10 with a jig or the like. Since this work can only be done by hand, it is very complicated and requires a lot of labor, The efficiency was significantly reduced.

Therefore, the present invention is intended to solve the above-mentioned problems, and the problem is that by increasing the permissible width with respect to the outer diameter of the wire rod, the work of selecting the wire rods becomes unnecessary, and at the same time, the wire is reliably held during processing. To obtain a new guide bush that does not interfere with its function.

[0010]

Means for Solving the Problems The means taken by the present invention for solving the above-mentioned problems include a sleeve member attached to a support portion for positioning and gripping a wire rod attached to a spindle near a processed portion, A chuck member that is housed in the sleeve member in a retractable manner and that has an insertion hole that inserts and holds the wire member; and a positioning member that positions the chuck member in the axial direction with respect to the sleeve member,
The sleeve member and the chuck member are configured to be relatively movable in the axial direction along an inclined surface that faces and abuts the sleeve member and the chuck member, and the inner diameter of the insertion hole is changed by the movement. In a guide rod for wire rod processing configured to be adjustable, an elastic member that is deformable in the axial direction is interposed between the positioning member and the sleeve member or the chuck member, and the diameter of the wire rod is changed by the deformation of the elastic member. Accordingly, the sleeve member and the chuck member are configured to be relatively movable in the axial direction.

Here, when the insertion hole is in a state of being less than the inner diameter corresponding to the minimum set value of the diameter of the wire, the elastic member is in an elastically acting state, that is, the elastic member is stressed against other members. It is preferable that the elastic member is in an elastically operating state when the insertion hole is in the inner diameter range corresponding to the minimum set value to the maximum set value of the wire diameter .

In this case, further, a plurality of slits extending around the axis are formed in the elastic member, and the elastic member is brought into contact with the sleeve member, the chuck member, or the positioning member on the outer surface of each slit forming portion. It is desirable to use a ring-shaped spring washer having a portion.

Further, it is preferable that a front end portion of the inclined surface provided on the sleeve member is formed at a position more forward than a front end portion of the inclined surface provided on the chuck member. Further, it is preferable to provide a locally easily deformable portion at a part of the deformed portion of the chuck member when the inner diameter of the insertion hole is changed.

[0014]

According to the present invention, the diameter of the wire is larger than the set value because the sleeve member and the chuck member are relatively movable by the elastic member inserted so as to be deformable in the axial direction. In this case, since the inner diameter of the insertion hole is enlarged due to the deformation of the elastic member, the increase in the tightening force on the wire is suppressed, and the twisting of the wire is prevented. In this case, since the elastic force of the elastic member acts in the axial direction, the elastic member flexibly follows the diameter change of the wire rod inserted from the rear side, while providing a certain counter force against the stress received from the front processing position. Can be held.

According to the second aspect, the elastic member is not in an elastic state when the diameter of the wire is less than the minimum set value, and the diameter of the wire is within the range from the minimum set value to the maximum set value. Is configured to be in an elastic state,
It is possible to reduce the overlapping amount of the elastic force of the elastic member with respect to the tightening force of the wire rod, and it is possible to cope with a wide range of wire diameters.

According to the third aspect, by using the spring washer provided with the slit extending around the axis as the elastic member, it is easy to obtain the dimensional accuracy in the standard state which is not in the elastic action state, and the desired elastic force can be compactly obtained. It is possible to obtain. Here, the elastic force can be easily adjusted by changing the thickness of the ring-shaped portion around the slit. By providing a plurality of slits around the axis, the elastic characteristics around the axis can be made uniform.

According to the fourth aspect, when the front end of the inclined surface of the sleeve member is formed at a position forward of the front end portion of the inclined surface of the chuck member, when stress is applied to the wire inserted in the insertion hole, Since the front end portion of the inclined surface of the chuck member is in contact with the inclined surface of the sleeve member, the front end of the chuck member is less likely to be deformed, so that the resistance force against the stress received by the wire during processing can be increased. .

According to the fifth aspect of the present invention, the chuck member is easily deformed by providing a locally easily deformable portion in a part of the deformable portion of the chuck member when the inner diameter of the insertion hole is changed. Increased by the addition of elastic force of the member,
It is possible to reduce the rate of change of the tightening force with respect to the change of the inner diameter of the insertion hole. Also, by providing this part locally, the conventional guide bush can be easily modified, and
The elasticity of the chuck member can be easily adjusted.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wire bushing guide bush according to the present invention will now be described with reference to the drawings. FIG. 1 shows a sectional structure of a guide bush 30 of this embodiment. The guide bush 30 includes an outer peripheral sleeve 31, a chuck 32 inserted inside the outer peripheral sleeve 30, a positioning nut 33 screwed to the rear end of the chuck 32, and a rear end of the outer peripheral sleeve 31 and the positioning nut 33. The spring washer 34 is interposed between the spring washer 34 and the front end face.

An inclined surface 31a formed at an angle of about 17 degrees from the horizontal plane is provided at the front portion of the outer peripheral sleeve 31,
This inclined surface 31a is about the same as the front portion of the chuck 32.
It is in contact with an inclined surface 32a that is inclined by 7 degrees.
The front end F of the inclined surface 32a of the chuck 32 has an inclined surface 31a rearward of the front end G of the inclined surface 31a of the outer peripheral sleeve 31.
It is configured to abut on the top.

As shown in FIG. 2, the front portion of the chuck 32 has slits 32 radially formed from the axis toward the outer circumference.
It is divided into three by A, 32B, and 32C. This 3
An insertion hole 32b for inserting the wire 10 is formed at the center of the divided chuck front portion. Insertion hole 32
b is configured such that its inner diameter can be increased or decreased by the presence of the slits 32A, 32B, 32C.

A slit 32 is provided at the rear of the chuck 32.
A tubular portion extending further rearward is formed from a base portion in which A, 32B, and 32C are integrally formed, and a male screw portion 32c is formed on the outer periphery of the tubular portion. This male screw part 32
c is screwed to the female screw portion 33a of the rear positioning nut 33.

An annular groove 32d is formed on the outer peripheral surface of the base of the divided portion of the chuck 32. The annular groove 32d is formed to reduce the rigidity of the front end portion of the chuck 32. The formation of the annular groove 32d reduces the stress required for the deformation of the insertion hole 32b in the radial direction.

The spring washer 34 interposed between the outer peripheral sleeve 31 and the positioning nut 33 is provided with two slits 34a, 34a having the same shape around the axis, respectively. Then, on the end face of the outer peripheral sleeve 31 side, the action seat 3 formed in a convex shape is formed.
4b are formed respectively.

FIG. 3 shows an exploded sectional view (a) showing the assembled state of the positioning nut 33 and the spring washer 34, and a perspective view (b) showing the shape of the spring washer 34. Spring washer 34
By forming the two slits 34a, 34a, the two ring-shaped portions 34A, 34B are connected by the two bridge portions 34c, 34c.

The two action seats 34b are just the bridge portion 34.
It is formed at an intermediate position between the formation positions of c. The spring washer 34 is attached to the outer peripheral sleeve 31 and the positioning nut 3
3 and the positioning nut 33 is tightened up with respect to the chuck 32 that is already screwed, the ring-shaped portions 34A and 34B of the spring washer 34 are deformed at the portions where the slits 34a are formed. , Is compressed with a predetermined spring force.

The spring washer 34 may generally be any other elastic member, but is made of metal in order to increase the repeatability of the tightening force of the insertion hole 32b and suppress the size of the guide bush. Washers are preferred. The spring washer may be a corrugated one using a leaf spring or a coil type one using a coil spring. In order to make the elasticity of the spring washer uniform around the axis, it is preferable to provide at least two slits. Three or more slits and action seats may be provided around the axis.

In this embodiment, +0 mm, -0.005 mm
A wire rod with a general tolerance of 1.2 mm diameter was used as a work, and was adopted in a processing machine that performs tooth splitting on this work. Therefore, the minimum diameter of the wire rod is φmin = 1.195 mm, and the maximum diameter is φmax.
= 1.200 mm.

It is necessary for the wire rod 10 to be able to rotate without being twisted while being inserted into the guide bush. To satisfy this condition, in this embodiment, the range of tightening force to the wire rod is set. Be Fmin to Fmax, and Fmin
= 0.6 kg and Fmax = 2.0 kg.

Here, the value of Fmin is such that a wire having a diameter of φmin is inserted, the tip of the wire is projected 5 mm from the tip of the guide bush, and a stress of 4 to 5 kg is applied at a position 2 mm from the tip of the guide bush. The value is set so that no clearance is generated between the wire rod and the guide bush.

Further, the value of Fmax is obtained by inserting a wire rod having a diameter of φmin into the guide bush and setting the tightening force to the wire rod by Fm.
The value was adjusted to the value of ax, and then, when a wire rod having a diameter of φmax was inserted and the wire rod was rotated at a predetermined position behind the guide bush, it was set to a value that could be rotated without difficulty.

Next, the chuck 32 and the spring washer 34 are set so that the tightening force falls within the range of Fmin to Fmax.
Was adjusted. The elasticity of the chuck 32 depends on the annular groove 32.
The thickness W of the portion where d is formed (see FIG. 2) is adjusted, and the elasticity of the spring washer 34 is adjusted by the thickness t shown in FIG.

In this adjustment, the spring washer 34 is not in the compressed state when the positioning nut 33 is screwed so that the tightening force is Fmin while the wire having the diameter of φmin is inserted, and in this adjusted state, φmax It is performed so that the tightening force falls within Fmax or less when a wire having a diameter of 4 is inserted.

The state adjusted in this way is shown in FIG.
Shown in Conventionally, as shown by B in the figure, the standard tightening force of the material is 0.6 kg, the adjustment unit is about 0.001 mm, and the tightening force is Fmin when the variation of the wire diameter is 0.001 mm. From F to Fmax, it was necessary to make the variation in the diameter of the wire material within 0.001 mm in advance.

On the other hand, in this embodiment, as shown by A in the figure, even if the wire diameter varies by 0.005 mm, the tightening force can be maintained within the range of Fmin to Fmax. This is because the elastic force of the spring washer 34 suppresses an increase in the tightening force even when a wire rod having a relatively large diameter is inserted into the insertion hole, and as a result, a wide range of wire rod diameters can be accommodated. In this case, since the elastic force of the chuck 32 is reduced by forming the annular groove, an increase in the entire tightening force is suppressed, and the elastic characteristic of the spring washer 34 mainly determines the characteristic corresponding to the wire diameter. As a result, the characteristics of the guide bush can be adjusted more easily.

Therefore, as shown in FIG. 4 (b), even if the wire rod is manufactured within the range of the tolerance D in the related art, the wire diameter is selected in five stages and the variation range of each diameter is set to 0. In contrast to the case where the continuous processing was possible only when the distance was set to within 0.001 mm, in the present embodiment, the continuous processing can be performed without the sorting work for the wire material within the tolerance range.

In this embodiment, as shown in FIG.
When 0 enters the insertion hole 32b of the chuck 32, the spring washer 34 is compressed by the advancing force of the wire 10 and the chuck 3
Since 2 is pushed forward, only the elastic force of the chuck 32 temporarily becomes an opposing force that expands the inner diameter of the insertion hole 32b to the diameter of the wire 10. Therefore, when inserting the wire rod 10, a very large force is not required.

Once the wire rod 10 is inserted into the insertion hole 32b, the wire rod 10 is tightened by the sum of the elastic force of the chuck 32 and the elastic force of the spring washer 34. The tightening force of the wire at this time is 0.6 to 2.0 as described above.
Although the value is within the range of kg, when the wire rod 10 is advancing, a part of the elastic force of the spring washer 34 is consumed by the advancing force (or sliding resistance with the insertion hole), so A slight decrease in the applied force occurs.

As described above, the tightening force from the guide bush to the wire rod is 0.6 to 2.0 kg, but the counter force against the stress applied to the wire rod by the cutting tool is 4 to 5 kg or more. The stress that the wire receives from the bite is the slope 31
It is because only the component force in the axial direction generated by the inclination angle is applied to the spring washer 34. In particular, in this embodiment, the structures of the inclined surface 31a of the outer peripheral sleeve 31 and the inclined surface 32a of the chuck 32 are improved in order to increase the resistance against the stress received from the cutting tool. This is shown in FIG.

FIG. 5 (a) shows the front end of the conventional guide bush, and the front end G of the inclined surface 21a of the outer peripheral sleeve 21 is behind the front end F of the inclined surface 22a of the chuck 22. In this structure, when the wire rod 10 receives a stress from the bite, the chuck 22 is deformed with the front end G of the inclined surface 21a as a fulcrum, which facilitates the generation of a clearance at the front end side of the insertion hole 22b, and the chuck 22 is pulled out in the direction in which it is pulled out. Power is added to. Since this force acts in the direction of expanding the diameter of the insertion hole 22b, it reduces the holding force of the wire and weakens the stress received from the cutting tool.

On the other hand, FIG. 5 (b) shows the front end portion of the guide bush of this embodiment. In this case, the outer peripheral sleeve 3
The front end G of the inclined surface 31a of No. 1 is the inclined surface 32 of the chuck 32.
It is in front of the front end F of a. In this structure, the wire 10
When the tool receives stress from the bite, the chuck 32
Attempts to deform the front end F of 2a as a fulcrum, but the chuck 32 cannot be deformed unless the outer peripheral sleeve 31 is deformed, and the counter force against the deformation of the chuck 32 becomes extremely large. In this embodiment, the outer peripheral sleeve 31 and the chuck 3 are
A spring washer 34 is interposed between the spring washer 2 and the spring washer 2 because even if the spring washer 34 is elastically deformed, the stress received from the bite does not directly act in the direction of pulling out the chuck 32. The decrease in the counter force against the bite stress due to the presence of 34 is not large.

By disposing the front end F of the inclined surface 32a of the chuck 32 rearward of the front end G of the inclined surface 31a of the outer peripheral sleeve 31, the insertion hole 32a for tightening the wire rod 10 is also prevented from moving rearward. In order to
A wire having a same length and a predetermined length is formed in front of the front end F.
The holding position of is almost the same as the conventional one.

[0043]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect, since the sleeve member and the chuck member are configured to be relatively movable by the elastic member inserted so as to be deformable in the axial direction, the diameter of the wire is larger than the set value. In this case, since the inner diameter of the insertion hole is enlarged due to the deformation of the elastic member, the increase in the tightening force on the wire is suppressed, and the twisting of the wire is prevented. In this case, since the elastic force of the elastic member acts in the axial direction, the elastic member flexibly follows the diameter change of the wire rod inserted from the rear side, while providing a certain counter force against the stress received from the front processing position. Can be held. Therefore, it is possible to realize a guide bush that can flexibly cope with variations in wire diameter without reducing the holding force of the wire, and it is possible to reduce the work of selecting the wire.

According to the second aspect, the elastic member is not in an elastic state when the diameter of the wire is less than the minimum set value, and the diameter of the wire is within the range from the minimum set value to the maximum set value. Is configured to be in an elastic state,
It is possible to reduce the overlapping amount of the elastic force of the elastic member with respect to the tightening force of the wire rod, and it is possible to cope with a wide range of wire diameters.

According to the third aspect, by using the spring washer having the slit extending around the axis as the elastic member, the dimensional accuracy in the standard state which is not in the elastically acting state can be easily obtained, and the desired elastic force can be compactly obtained. It is possible to obtain. Here, the elastic force can be easily adjusted by changing the thickness of the ring-shaped portion around the slit. Moreover, by providing a plurality of slits around the axis, the elastic characteristics around the axis can be made uniform.

According to the fourth aspect, when the front end of the inclined surface of the sleeve member is formed at a position more forward than the front end portion of the inclined surface of the chuck member, when stress is applied to the wire inserted through the insertion hole, Since the front end portion of the inclined surface of the chuck member is in contact with the inclined surface of the sleeve member, the front end of the chuck member is less likely to be deformed, so that the resistance force against the stress received by the wire during processing can be increased. .

According to the fifth aspect, the chuck member is easily deformed by providing a locally easily deformable portion in a part of the deformed portion of the chuck member when the inner diameter of the insertion hole is changed. Increased by the addition of elastic force of the member,
It is possible to reduce the rate of change of the tightening force with respect to the change of the inner diameter of the insertion hole. Also, by providing this part locally, the conventional guide bush can be easily modified, and
The elasticity of the chuck member can be easily adjusted.

According to the sixth aspect, by providing each of the guide bushes in the cutting apparatus, the permissible width with respect to the diameter of the wire rod is increased, the material selection work before processing can be reduced, and the defective rate of the processed product can be reduced. It can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a guide bush for wire rod processing according to the present invention.

2A and 2B are a front view and a partial cross-sectional side view showing a structure of a chuck housed in a guide bush of the embodiment.

FIG. 3 is an exploded sectional view (a) showing an assembled state of a positioning nut and a spring washer and a perspective view (b) showing a shape of the spring washer.

FIG. 4 is a graph (a) showing the relationship between the work diameter variation and the tightening force and a graph (b) showing the distribution of the work diameter.

FIG. 5 is an enlarged sectional view (a) showing a structure of a conventional guide bush front end portion and an enlarged sectional view (b) showing a structure of a guide bush front end portion of an embodiment.

FIG. 6 is a vertical cross-sectional view showing the structure of a guide bush installed in a conventional cutting machine.

[Explanation of symbols]

 10 wire rod 30 guide bush 31 outer peripheral sleeve 32 chuck 33 positioning nut 34 spring washer

Claims (6)

[Claims] 1. A sleeve member attached to a support portion for positioning and gripping a wire rod attached to a main shaft in the vicinity of a processed portion, and a sleeve member that is retractably housed inside the sleeve member and inserts and holds the wire rod. A chuck member having an insertion hole, and a positioning member for positioning the chuck member in the axial direction with respect to the sleeve member, and along the inclined surface that faces and abuts the sleeve member and the chuck member. In the guide rod for wire rod processing, wherein the sleeve member and the chuck member are movable relative to each other in the axial direction, and the inner diameter of the insertion hole is adjustable by the movement, the positioning member and the sleeve member Alternatively, an elastic member that can be deformed in the axial direction is inserted between the chuck member and the chuck member, and the elastic member deforms to move in accordance with the diameter of the wire. Wire working guide bush, characterized in that the said chuck member and the sleeve member and relative movable in the axial direction. 2. The wire member according to claim 1, wherein the elastic member is not in an elastically actuated state when the insertion hole is in a state of being equal to or smaller than an inner diameter corresponding to a minimum set value of the wire diameter, and the wire diameter is set to the minimum value. A guide bush for wire rod processing, wherein the elastic member is configured to be in an elastically actuated state when the insertion hole is in an inner diameter range corresponding to a value to a maximum set value. 3. The elastic member according to claim 2, wherein a plurality of slits extending around the axis are formed around the axis, and the elastic member is in contact with the sleeve member, the chuck member, or the positioning member on the outer surface of each slit forming portion. A guide bush for wire rod processing, which is a ring-shaped spring washer provided with an action portion. 4. The front end portion of the inclined surface provided on the sleeve member according to claim 1, wherein the front end portion of the inclined surface provided on the chuck member is located in front of the front end portion of the inclined surface. A guide bush for wire processing. 5. The guide bush for wire rod processing according to claim 1, wherein a portion that is locally deformable is provided in a part of a deformed portion of the chuck member when the inner diameter of the insertion hole is changed. . 6. A cutting device in which the guide bush for wire rod processing according to claim 1 is arranged between the spindle and a tool position.