JP2004230503A - Tip clamping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throwaway tip clamping device which firmly clamps a tip without impairing operability. <P>SOLUTION: In this tip clamping device, a clamping piece 1 with an upward force point working on the rear end side and a downward application point working on the front end side with a fulcrum held in between, is integrated with or integrally provided at a holder 2, and the tip 5 is inserted and clamp-fixed between a clamping piece front pressing face 3 on which the downward application point works, and a holder side tip placing face 4. The inner side of a slit 6 provided between the rear part of the clamping piece 1 and the upper part of the holder 2 is provided with a pocket 9 of laterally symmetric truncated cone shape having a center axis right-angled to the longitudinal direction of the holder 2, and a pair of external screw 7 and internal screw 8 screwed in truncated cone head shape laterally symmetric with respect to the longitudinal direction of the holder 2 are inserted in the pocket 9. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamper for a throw-away insert in a throw-away type cutting tool used for cutting, particularly grooving or parting-off.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a cutting process, particularly a grooving process or a parting-off process, a throw-away type cutting tool that inserts a tip between a clamp piece and a holder and clamps the insert has been used.
[0003]
9 and 10 show an example of such a conventional throw-away type cutting tool. FIG. 9 is a side view of a main part, and FIG. 10 is a top view of FIG. As shown in FIG. 9, the rear end side is pushed up with the fulcrum sandwiched therebetween, whereby the tip side is pushed down by the principle of leverage, and the tip is clamped (for example, see Patent Document 1).
[0004]
According to this configuration, when a force is applied to the rear end of the clamp piece 21 which is the point of force in a direction in which the bolt 22 is pulled upward, the force is applied with the center of the clamp piece 21 as a fulcrum. It acts so as to press the pressing surface 23 on the tip side downward. As a result, the chip 25 is firmly clamped between the pressing surface 23 of the clamp piece 21 and the holder-side mounting surface 24.
[0005]
[Patent Document 1]
JP-A-11-138309
[Problems to be solved by the invention]
However, in the above-described configuration, the applied force does not uniformly act on the clamp piece pressing surface, and the clamp piece pressing surface collides with the upper surface of the chip, so that the chip constraint becomes unstable and during the cutting process, There have been problems such as the chip floating or shifting left and right.
[0007]
Further, in order to clamp the chip more firmly, the size of the bolt must be increased, and as a result, the rigidity of the holder itself may be reduced due to a decrease in the thickness of the holder. .
[0008]
Further, in order to apply the clamping force to the chip equally on the left and right, it is necessary to finely adjust each of the left and right bolts, and it is complicated and time-consuming to actually adjust the clamping force equally on the left and right.
[0009]
The present invention has been made in order to solve such problems of the prior art, and in cutting, in particular, in a throw-away type cutting tool used for grooving or parting off, the movement of a chip during processing is reduced. It is an object of the present invention to provide a throw-away tip clamping device capable of firmly clamping a tip without deteriorating operability.
[0010]
[Means for Solving the Problems]
In order to solve the above problem, the tip clamping device according to claim 1 has an upward force point on the rear end side with respect to the fulcrum, and a clamp piece in which a downward action point acts on the front end side is provided integrally or integrally with the holder, A tip clamp device in which a tip is inserted and clamped and fixed between a pressing surface in front of a clamp piece on which a downward action point acts and a chip mounting surface on a holder side, wherein the clamp piece rear and the upper part of the holder are provided. On the back side of the slit provided between them, a left-right symmetrical truncated cone-shaped pocket having a central axis perpendicular to the longitudinal direction of the holder is provided, and the pocket is provided with respect to the longitudinal direction of the holder. It is characterized in that a pair of male and female screws screwed into a symmetrical truncated conical shape are inserted.
[0011]
According to this configuration, by rotating the screwed male screw, the distance between the male screw and the female screw uniformly approaches, so that the contact surface between the pocket inner wall and the male screw head side surface and the female screw head side surface is formed. Approximately the right and left stresses are generated in the longitudinal direction of the holder, and such stress acts to push up the rear end side of the clamp piece evenly left and right. As a result, the pressing surface on the front end side of the clamp piece is biased. In addition to being pressed down evenly, in addition to being able to firmly clamp and fix the chip with an even force, stress is generated in the state of surface contact, so there is no need to increase the size of the member to increase the clamping force, With a compact structure with good operability, a large clamping force can be obtained.
[0012]
Further, the tip clamping device according to claim 2 is provided with a detent member at a position on a side surface of the pocket portion into which the female screw head is inserted, and the female screw head is engaged with the detent member. It is characterized in that a groove is provided in the side surface portion.
[0013]
According to this configuration, only the operation of rotating the male screw side with the rotary operation tool does not rotate the female screw together with the male screw, the male screw head and the female screw head approach uniformly, and the chip is evenly held and fixed without bias. As much stress as possible can be obtained, and by providing a detent on the side surface of the pocket portion, it is possible to maintain a firm clamping state of the chip with uniform stress without reducing the stress pushing up the rear end side of the clamp piece. I can do it.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0015]
1 to 8 show an embodiment of the present invention. FIG. 1 is a side view of a main part of a chip clamping device according to the embodiment, FIG. 2 is a top view of FIG. 1, and FIG. 3 is a front view of FIG. 4 is a cross-sectional view taken along line AA of FIG. 2, FIG. 5 is a transparent top view of FIG. 4, FIG. 6 is a left side view of FIG. 4, FIG. 7 is a right side view of FIG. Similarly, FIG. 4 is a right side view of FIG. 4 and shows another embodiment.
[0016]
1 to 6, the chip clamping device according to the present embodiment includes a clamp piece 1 and a holder 2 provided integrally with each other, and a gap between a pressing surface 3 on the front end side of the clamp piece 1 and a chip mounting surface 4 of the holder 2. A slit 6 is provided between the rear end side of the clamp piece 1 and the upper part of the holder 2, and a slit 6 is provided on the back side of the slit 6 with respect to the longitudinal direction of the holder 2. A pair of male screws screwed into the pocket 9 in a symmetrical truncated conical shape with respect to the longitudinal direction of the holder 2. 7 and a female screw 8 are inserted.
[0017]
Here, an insertion hole 13 is provided in the head of the male screw 7, and the rotary operation tool 12 is inserted into the insertion hole 13 and turned in the tightening direction so that the distance between the male screw 7 and the female screw 8 is uniform. , The contact surface between the inner wall of the pocket 9 and the side surface of the head of the male screw 7 and the side surface of the head of the female screw 8 generates substantially equal left and right stresses in the longitudinal direction of the holder 2. As a result, the pressing surface 3 on the front end side of the clamp piece 1 is pressed down very evenly, and the clamp piece pressing surface 3 and the holder-side chip mounting surface 4 are pushed upward. Can be firmly clamped with an even force.
[0018]
As shown in FIGS. 5 and 7, a rotation-stopping member 11 is provided at a position on the side surface of the pocket 9 into which the female screw 8 head is inserted, and engages with the rotation-stopping member 11. As described above, the groove 10 is provided in the side surface of the head of the female screw 8, and the female screw 8 is mounted in the pocket 9 of the holder 2 so that the detent member 11 engages with the groove 10. As a result, only the operation of rotating the male screw 7 side with the rotary operation tool 12 does not rotate the female screw 8 together with the male screw 7, the head of the male screw 7 and the head of the female screw 8 approach uniformly, and the tip 5 is evenly and evenly distributed. By providing a detent on the side surface of the pocket 9, it is possible to obtain a strong clamping state of the chip by uniform stress without reducing the stress pushing up the rear end of the clamp piece 1. Can be maintained. Incidentally, in FIG. 7, the anti-rotation member 11 is exemplified by using a square pillar-shaped driving pin member. However, as shown in FIG. 8, a cylindrical driving pin member may be used. When a cylindrical member is used, a screw-type member may be used.
[0019]
Here, when turning the rotary operation tool 12 to tighten the male screw 7, the male screw 7 is screwed toward the center of the pocket 9 and the female screw 8 is also moved toward the center of the pocket 9. At this time, on the contact surface between the inner wall of the pocket 9 and the side surface of the head portion of the male screw 7 and the side surface of the head portion of the female screw 8, substantially even stress is generated in the left-right direction with respect to the longitudinal direction of the holder 2. Such stress acts to push up the rear end side of the clamp piece 1 symmetrically and uniformly. Then, the slit 6 is opened, and the front end side of the clamp piece 1 is evenly pressed down, and presses the upper surface of the chip 5 in contact with the pressing surface 3 of the clamp piece 1.
[0020]
As a result, the chip 5 is clamped with a uniform force in the left and right directions without deviation, and stable processing can be performed without causing a chip displacement during cutting.
[0021]
Further, since stress is generated in the state of surface contact, it is not necessary to increase the size of the member to increase the clamping force. Therefore, an extremely large clamping force can be obtained with a compact structure having good operability.
[0022]
In addition, it is preferable that the appropriate value of the taper angle of the truncated cone of the pocket 9 be in the range of 3 ° to 20 °. When the taper angle is smaller than 3 °, an extremely large screw stroke is required to obtain a desired clamping force. Therefore, the pocket 9 must be lengthened and the holder width must be increased. This impairs the operability of the tool and results in an increase in tool cost. When the taper angle is larger than 20 °, the diameter of the pocket 9 must be increased. As a result, a new problem occurs in that the strength of the holder body is reduced.
[0023]
As described above, the embodiments of the present invention have been exemplified. However, it is needless to say that the present invention is not limited to the above-described embodiments, and may be arbitrary without departing from the object of the invention.
[0024]
【The invention's effect】
As described above, the tip clamp device according to the first aspect of the present invention provides a clamp piece in which an upward force point acts on the rear end side with respect to the fulcrum and a downward action point acts on the front end side integrally or integrally with the holder. A tip clamp device in which a tip is inserted and clamped and fixed between a pressing surface in front of a clamp piece on which an action point works and a chip mounting surface on a holder side, wherein a tip is provided between the rear of the clamp piece and the upper part of the holder. On the far side of the slit provided at the side, a symmetrical truncated cone-shaped pocket having a central axis perpendicular to the longitudinal direction of the holder is provided, and the pocket is symmetrical with respect to the longitudinal direction of the holder. By inserting a pair of male screw and female screw screwed into a truncated cone shape, the distance between the male screw and female screw becomes uniform by rotating the screwed male screw. In the contact surface between the inner wall of the pocket and the side surface of the male screw head and the side surface of the female screw head, approximately equal left and right stresses are generated in the longitudinal direction of the holder. As a result, the pressing surface on the front end side of the clamp piece is pressed down evenly and without bias, so that the chip can be firmly clamped and fixed with an equal force, and the stress in the state of surface contact. Therefore, it is not necessary to increase the size of the member in order to increase the clamping force, and a large clamping force can be obtained with a compact structure having good operability.
[0025]
Further, the tip clamping device according to claim 2 is provided with a detent member at a position on a side surface of the pocket portion into which the female screw head is inserted, and the female screw head is engaged with the detent member. Since the groove is provided on the side surface of the part, only the operation of rotating the male screw side with the rotary operation tool does not rotate the female screw with the male screw, the male screw head and the female screw head uniformly approach, and the tip Stress that can be clamped and fixed evenly without bias, and by providing a detent on the side surface of the pocket portion, the force of pushing up the rear end side of the clamp piece can be reduced, and the chip can be firmly formed by uniform stress without reducing the stress. The clamp state can be maintained.
[Brief description of the drawings]
FIG. 1 is a side view of a main part of a tip clamp device according to the present embodiment.
FIG. 2 is a top view of FIG.
FIG. 3 is a front view of FIG. 1;
FIG. 4 is a sectional view taken along line AA of FIG. 2;
FIG. 5 is a perspective top view of FIG. 4;
FIG. 6 is a left side view of FIG. 4;
FIG. 7 is a right side view of FIG.
FIG. 8 is a side view showing another embodiment of the present invention.
FIG. 9 is a side view, partially in section, of a main part of a conventional chip clamping device.
FIG. 10 is a top view of FIG. 9;
[Explanation of symbols]
1: clamp piece 2: holder body 3: pressing surface 4: mounting surface 5: chip 6: slit 7: male screw having a truncated cone shape on its head 8: female screw having a truncated cone shape on its head 9: truncated cone shape Pocket 10: Groove 11: Detent member 12: Rotating operation tool 13: Insertion hole 21: Clamp piece 22: Bolt 23: Pressing surface 24: Mounting surface 25: Chip

Claims (2)

A clamp piece with an upward force point on the rear end side with the fulcrum interposed and a downward action point on the front end side is provided integrally or integrally with the holder, and a pressing surface in front of the clamp piece and a tip on the holder side where the downward action point works. In a chip clamping device in which a chip is inserted between a mounting surface and pinched and fixed, in a longitudinal direction of the holder, at a depth side of a slit provided between the clamp piece rear and the holder upper part. A pair of male screw and female screw are provided with a left-right symmetric frustoconical pocket having a central axis perpendicular to the pocket, and screwed into the pocket in a left-right symmetric frustoconical shape with respect to the longitudinal direction of the holder. A chip clamp device, wherein a chip is inserted. A locking member is provided at a side surface position of the pocket portion into which the female screw head is inserted, and a groove is provided on the female screw head side surface portion so as to engage with the locking member. The tip clamp device according to claim 1, characterized in that:

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