JP2013111705A - Throwaway type cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throwaway type cutting tool which facilitates attachment/detachment of an insert and presses and fixes the insert accurately.SOLUTION: The throwaway type cutting tool 1 includes: a holder 2 having an upper jaw 3 and a lower jaw 4 on one side of the front end of the holder 2, the upper and lower jaws 3 and 4 forming an insert holding space therebetween, and a contact surface 7 disposed on the top face of an upper jaw connecting part 6 continuing to the rear of the upper jaw 3; an insert 20 inserted in the insert holding space to be fixed there; and a holding metal fitting 10 whose side face 11 is screwed down to the other side of the holder 2 to cause the top 12 of the holding metal fitting 10 to press the contact surface 7, thus pressing the upper jaw 3 of the holder 2 to press/fix the insert 20 inserted in the insert holding space.

Description

  The present invention relates to a throw-away cutting tool provided with a cutting blade for processing a work material, and more particularly to a throw-away cutting tool for performing grooving or parting off.

  In a throw-away type cutting tool for performing grooving or parting-off processing, as a method for restraining a cutting insert, a restraining method using a screw is generally known. For example, Patent Document 1 describes a method in which a screw is inserted into a clamp hole opened in the center of the upper surface of a cutting insert and screwed to a holder. In the configuration in which this tip is screwed to the holder from the upper surface, it is often used by being attached to an NC lathe having a comb blade type tool post that is frequently used in small parts processing, and it is necessary to insert a screw from a direction that is difficult to operate. is there. Therefore, it takes time to replace the cutting insert, and it is easy to drop a screw during the work, and there are problems such as remarkably poor workability.

  In order to improve these problems, in Patent Document 2, the taper surface of the screw head is screwed from the lateral direction in a state in which the screw is screwed from the lower side to the upper side and the tip of the screw reaches the upper jaw. A method is disclosed in which the upper jaw is pressed downward by pushing downward with the tip of the tightened screw.

  Patent Document 3 describes a method in which a lower jaw is integrated with a holder, a plate including the upper jaw is formed as a separate body, and the plate is screwed on a side surface of the holder.

JP-A-11-123603 JP 2002-337909 A JP 2001-246506 A

  However, as in Patent Document 2, the tip of the screw is screwed from the lateral direction with the taper surface of the screw head of the screw in a state where the screw is screwed from the lower side to the upper side and the tip of the screw reaches the upper jaw. In the method of pressing down and pressing the upper jaw downward, the clamping force is weak and the taper surface of the screw head is consumed quickly.

  Further, as in Patent Document 3, when the plate including the upper jaw is formed as a separate body and screwed from the side of the holder, the positional accuracy of the upper and lower jaws is likely to go wrong, and the tip restraint surfaces of the upper and lower jaws are displaced. There was a problem that the binding force was reduced.

The throw-away cutting tool according to the present invention has an upper jaw and a lower jaw on one side of the tip, an insert holding space therebetween, and an abutting surface disposed on the upper surface of the upper jaw connecting portion following the upper jaw. A holder with
An insert inserted into the insert holding space and fixed;
When the side part is screwed to the other side of the holder, the upper part presses the contact surface, the upper jaw of the holder is pressed, and the insert inserted in the insert holding space is pressed and fixed. Holding metal fittings,
It has.

  According to the throw-away type cutting tool of the present invention, by tightening the screw from the back side (the other side) side, the lower surface of the upper part of the presser bracket as the presser bracket moves forward to the front side (one side) side of the holder. By pressing the contact surface of the holder, the upper jaw following the contact surface is pressed downward, so that the upper jaw can be tightened downward without being displaced and the insert can be pressed and fixed.

It is (a) top view about the throw away type cutting tool in a preferred embodiment of the present invention, (b) tip view, and (c) side view (one side of tip: viewed from front A). It is a schematic perspective view of the state which attached the pressing metal fitting to the holder of the throw away type cutting tool of FIG. It is a disassembled perspective view for demonstrating the structure of the holder of FIG. 2, and a pressing metal fitting. It is a schematic diagram for demonstrating the structure of the contact surface of a holder upper surface, and the upper part of a pressing metal fitting, (a) The structure where the contact surface of a holder upper surface is a taper surface which inclines upwards toward a front surface, (b) A configuration in which the lower surface of the upper part of the presser bracket is a tapered surface that is inclined downward toward the front surface. (C) Both the contact surface of the upper surface of the holder and the lower surface of the upper part of the presser bracket are tapered surfaces that are inclined upward toward the front surface. It is a figure for demonstrating a structure. It is a schematic diagram for demonstrating the structure of a pressing metal, (a) The structure where the horizontal length of the lower part of a pressing metal is shorter than the horizontal length of the upper part of a pressing metal, (b) The horizontal of the lower part of a pressing metal It is a figure for demonstrating the structure when the length of a direction is the same as the length of the horizontal direction of the upper part of a pressing metal fitting, and the structure at the time of removing these pressing metal fittings.

  FIGS. 1-5 show a preferred embodiment of the present invention, and (a) a plan view, (b) a front view, and (c) a side view of a throw-away cutting tool according to a preferred embodiment of the present invention. 1 is a schematic perspective view of a state in which a pressing metal fitting is attached to a holder of a throw-away type cutting tool according to the first embodiment of the present invention. FIG. 3 is an exploded perspective view for explaining the configuration of the holder and the presser fitting in FIG. 2, and is a schematic diagram for explaining the configuration of the contact surface of the upper surface of the holder and the upper part of the presser fixture. A configuration in which the contact surface of the upper surface of the holder is a tapered surface inclined upward toward the front surface A; (b) a configuration in which the lower surface of the upper portion of the presser fitting is a tapered surface inclined downward toward the front surface A; Both the contact surface on the upper surface of the holder and the lower surface on the top of the presser bracket FIG. 4 is a diagram for explaining a configuration that is a tapered surface inclined upward toward the front surface A. (a) The lateral length of the lower part of the presser fitting is shorter than the lateral length of the upper part of the presser fitting. FIG. 5 is a diagram for explaining a configuration, (b) a configuration in which the horizontal length of the lower portion of the presser fitting is the same as the horizontal length of the upper portion of the presser fixture, and a configuration when removing these presser fixtures. This will be explained based on.

  1-5, a throw-away cutting tool (hereinafter abbreviated as a tool) 1 according to the present embodiment is particularly suitable for grooving and parting off. The tool 1 is provided with an upper jaw 3 and a lower jaw 4 on one side of the tip (hereinafter referred to as a front surface A) to form an insert holding space 5 therebetween, and an upper surface of an upper jaw connecting portion 6 that follows the upper jaw 3. A holder 2 having an abutment surface 7 formed thereon is provided. An insert 20 is inserted and fixed in the insert holding space 5. In addition, the holding metal fitting 10 is assembled to the holder 2. In FIG. 1, the presser fitting 10 is shown with diagonal lines for easy understanding. The presser fitting 10 has the side surface 11 screwed to the other side of the holder 2 (hereinafter referred to as the rear surface B), so that the upper portion 3 presses the contact surface 7, whereby the upper jaw 3 of the holder 2 is The insert 20 that is pressed and inserted into the insert holding space 5 is pressed and fixed.

  According to this configuration, the clamp bolt 13 for tightening the presser fitting 10 can be operated from the rear B side, which is relatively easy to operate. It is not necessary to operate the screw member from the vertical direction when it is difficult to operate when attaching / detaching, and the screw is not dropped when attaching / detaching the insert 20. In addition, since the upper jaw 3 and the lower jaw 4 are formed as a single body, the upper jaw 3 and the lower jaw 4 are not mounted in a shifted position, and the insert 20 can be stably restrained. The surfaces 3a and 4a that are in contact with the inserts 20 of the upper jaw 3 and the lower jaw 4 are formed with concave grooves or convex portions (convex portions in FIG. 2) in parallel from the tip to the rear. This is desirable in that the displacement of the insert 20 can be suppressed and the restraining force of the insert 20 can be increased. In addition, the lower jaw adjacent part 9 of FIG. 1-3 is notched in the area | region located in the side of the insert 20 of the lower jaw adjacent part 9 in order to give the escape which avoids contacting with a work material. Further, a lower jaw connecting portion 15 is formed behind the lower jaw 4 and the lower jaw adjacent portion 9. Moreover, in FIG. 1-3, although the lower jaw adjacent part 9 is formed in order to raise the intensity | strength of the lower jaw 4 in the back surface B side of the lower jaw 4, the lower jaw adjacent part 9 does not need and the lower jaw connection part is on the front end side. 15 may be exposed.

  Here, as for the relationship between the contact surface 7 of the holder 2 and the lower surface 12a of the upper part 12 of the presser fitting 10, several forms can be adopted. For example, as shown in FIG. A configuration in which the contact surface is a tapered surface inclined upward toward the front surface A, (b) a configuration in which the lower surface of the upper portion of the presser fitting is a tapered surface inclined downward toward the front surface A, and (c) the upper surface of the holder The structure which is a taper surface which inclines upward toward the front surface A to the contact surface and the lower surface of the upper part of the pressing metal fitting 10 is mentioned. With either configuration, the presser fitting 10 is screwed to the holder 2 to ensure that the upper portion 12 presses the contact surface 7 and the upper jaw 3 of the holder 2 is pressed, and the insert holding space 5 is pressed. The insert 20 inserted into can be pressed and fixed. In addition, although FIG. 1-3 has the structure of FIG.4 (c), if it is this structure, the upper jaw 3 can be pressed more firmly. Here, if the contact surface 7 of the holder 2 and the lower surface 12a of the upper part 12 of the pressing metal 10 are in surface contact, the pressing force of the upper jaw 3 is high. Moreover, the structure which the contact surface 7 of the holder 2 is contact | abutted and pressed so that only the front surface A side of the lower surfaces 12a of the upper part 12 of the press metal fitting 10 may be contacted may be sufficient. If it is this structure, since the upper part 12 of the holding | maintenance metal fitting 10 is strongly pressed by the front surface A direction, the restraint force of the horizontal direction (width direction) of the insert 20 can also be raised, and the insert 20 jumps out to the front surface direction. Can also be suppressed.

  Moreover, it is desirable that the upper surface of the upper jaw connecting portion 6 of the holder 2 is configured to constitute a non-contact portion 8 formed lower on the back surface B side to which the pressing metal fitting 10 is screwed than the contact surface 7. Furthermore, it is preferable that the area of the non-contact portion 8 is wider than the area of the contact surface 7. Thus, the abutment surface 7 can be pressed more strongly by screwing the presser fitting 10, so that the upper jaw 3 of the holder 2 can be pressed more strongly and the insert 20 can be pressed and fixed more firmly.

  Furthermore, the presser fitting 10 includes a lower portion 14 that is in contact with the lower surface of the lower jaw connecting portion 15 of the holder 2 following the side surface portion 11, and the lateral length of the lower portion 14 is the lateral length of the upper portion 12. A shorter configuration is desirable. If it is this structure, as shown in the schematic diagram of FIG. 5, since the presser metal fitting 10 is easy to remove, the attachment or detachment of the presser metal fitting 10 becomes easy. Moreover, the thickness of the lower jaw connection part 15 following the lower jaw 4 of the holder 2 can be increased, and chattering can be prevented from occurring during cutting. It is particularly desirable that the lateral length of the lower portion 14 is ¼ or less of the lateral length of the upper portion 12. In addition, since the lower part 14 exists in the presser metal fitting 10, when the presser metal fitting 10 is screwed, the lower part 14 serves as a fulcrum and the screw member 13 serves as an action point to press the contact surface more strongly with this principle. Can do.

As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to the said embodiment, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the objective of invention.

1 Throw-away cutting tool (tool)
2 Holder 3 Upper jaw 3a Surface 4 Lower jaw 4a Surface 5 Insert holding space 6 Upper jaw connecting portion 7 Contact surface 8 Non-contact portion 9 Lower jaw adjacent portion 10 Holding metal 11 Side surface portion 12 Upper portion 12a Lower surface 13 Clamp bolt 14 Lower portion 15 Lower jaw connecting portion 20 inserts

Claims (5)

An upper jaw and a lower jaw are provided on one side of the tip, an insert holding space is provided therebetween, and a holder provided with an abutment surface disposed on the upper surface of the upper jaw connecting portion following the upper jaw;
An insert inserted into the insert holding space and fixed;
When the side part is screwed to the other side of the holder, the upper part presses the contact surface, the upper jaw of the holder is pressed, and the insert inserted in the insert holding space is pressed and fixed. Holding metal fittings,
A throw-away type cutting tool comprising:   The contact surface of the holder is a tapered surface that is inclined upward toward the one side, or the lower surface of the upper portion of the presser fitting is a tapered surface that is inclined upward toward the one side. Item 10. A throw-away type cutting tool according to item 1.   The throw-away type according to claim 1 or 2, wherein the non-contact portion is configured such that the other side of the upper jaw connecting portion on which the presser fitting is screwed is formed lower than the tapered surface of the upper jaw connecting portion. Cutting tools.   The throw-away cutting tool according to any one of claims 1 to 3, wherein the taper surface of the presser fitting is pressed only by the one side portion of the taper surface.   The presser fitting includes a presser lower portion that comes into contact with the lower surface of the holder following the side surface portion, and the lateral length of the lower portion is shorter than the lateral length of the upper portion. The throw-away cutting tool according to any one of 1 to 4.