JP3194195U - Throw-away tool and processing device equipped with the tool - Google Patents

Abstract

A throw-away tool and a machining apparatus for simultaneously machining a plurality of workpieces using a single throw-away tip are provided. A shank (3) for mounting a rectangular throwaway tip (2) having at least a pair of cutting edges (21) is provided, and each of the pair of cutting edges (21) protrudes to the opposite side of the shank (3). The first to fourth wall portions K1 to K4 that are formed around the seating surface 31 and face the four side surfaces of the throwaway tip 2, respectively, and the throwaway Throw having a screw hole 33 provided in the seating surface 31 so that the screw member 4 inserted into the through hole portion 22 formed in the throw-away tip 2 can be screwed to fix the tip 2 to the shank 3. An away bit 1 and a processing apparatus using the bit 1. [Selection] Figure 2

Description

  The present invention relates to a throw-away tool for cutting, for example, a metal workpiece, and a processing apparatus including the throw-away tool.

  Conventionally, for example, in order to finish an end face of a metal workpiece, cutting using a throw-away tip (hereinafter simply referred to as “chip”) is performed. The tip can be fixed to the tip of the shank. However, since the cutting edge of the tip wears with processing, the tip needs to be replaced periodically. In addition, depending on the processing part of the metal workpiece, the tip must be set to an intended posture. For this reason, the tip fixing posture with respect to the shank may be changed. Conventionally, there is a technical document relating to such a byte as shown in Patent Document 1 below.

  The chip attached to the cutting tool has a rectangular planar shape, and a blade portion is formed on each of four sides of one surface. The tip is attached at an angle of 45 degrees with respect to the shank so that the corners of the blades on the two sides protrude from the side surface of the shank. When cutting a workpiece, for example, one of the corners of a plurality of blades is used. Since this blade portion wears with use, the processing is continued by sequentially changing the blade portion to be used. This tip is fixed to the tip of the shank with a mounting screw. Since this chip has three corners of the blade protruding from the shank, the workpiece can be cut using each corner without changing the tip from the shank when machining the workpiece.

Utility Model Registration No. 3141295

As a result of improving the time for replacing the chip, the machining efficiency of the workpiece is improved. However, since there are various parts as the work part of the workpiece, even when the throw away tool is used, it is necessary to change the relative posture of the work and the throw away tool according to the part to be cut. For this purpose, the configuration of the apparatus becomes complicated, for example, by providing a complicated posture changing mechanism on the side of the mechanism for holding the cutting tool of the machining apparatus or making the holding structure of the spindle for rotating and holding the workpiece complicated.
In addition, in the conventional tool, even though the number of times of chip attachment / detachment can be reduced, the time required for actual cutting is not shortened because the blade portion used for processing the workpiece is one place.

  As described above, the conventional cutting tool or the processing apparatus has a limit in increasing the processing efficiency of the workpiece, for example, the structure of the processing device is complicated and the actual processing time of the workpiece is not shortened.

  In view of the above background, an object of the present invention is to provide a throw-away tool capable of simultaneously processing a plurality of workpieces using a single throw-away tip and a processing apparatus using the tool.

  A throw-away tool according to the present invention includes a shank to which a rectangular throw-away tip having at least a pair of blade portions is attached, and each of the pair of blade portions protrudes on the opposite side across the shank. A seat surface that receives the throw-away tip in a state of being formed, a first wall portion to a fourth wall portion that are formed around the seat surface and respectively face the four side surfaces of the throw-away tip, and the throw-away tip And a screw hole provided in the seating surface so that a screw member inserted into a through-hole portion formed in the throw-away tip can be screwed.

The throw-away tool of this configuration can be used, for example, when the bottom surface of a rotating workpiece is surface-cut from the outer diameter edge portion toward the rotating shaft core and two workpieces are processed simultaneously. Thus, in order to process two workpieces simultaneously using one throw-away tip, not only the throw-away tool has sufficient strength but also the throw-away tip needs to be firmly held.
Therefore, in the present invention, when a rectangular throw-away tip is attached to the shank, at least a pair of blade portions of the throw-away tip are projected to the opposite side with the shank interposed therebetween. At this time, since each of the four side surfaces of the throw-away tip is held by the first to fourth wall portions formed on the shank, the throw-away tip is firmly fixed.
Therefore, even when a plurality of workpieces are simultaneously machined using a single throw-away tool, the throw-away tool does not vibrate and stable cutting can be performed.

  A processing apparatus according to the present invention includes a throw-away tool, that is, a shank for attaching a rectangular throw-away tip having at least a pair of blade portions, and each of the pair of blade portions sandwiches the shank in the shank. A seat surface that receives the throw-away tip in a state of projecting to the opposite side, and a first wall portion to a fourth wall portion that are formed around the seat surface and respectively face the four side surfaces of the throw-away tip; A female screw portion provided on the seating surface so that a male screw member inserted into a through-hole portion formed in the throw-away tip can be screwed to fix the throw-away tip to the shank. A clamp part that holds a throw-away tool, and two workpieces that are cut by the throw-away tip, each rotatably held, The throw away bite is configured to hold two workpiece holding portions capable of changing the position of each workpiece with respect to the movement path of the throw away tip, and hold the clamp portion, and cut each of the two workpieces simultaneously. And a feed mechanism that holds the two workpieces that rotate in a releasable manner along at least one feed direction.

  As in this configuration, the throwaway tool is configured so that it can be withdrawn from and withdrawn from the workpiece, and the two workpieces can be aligned with the movement path of this throwaway tool. Two workpieces can be machined at one time only by retraction. Therefore, the processing apparatus excellent in cutting efficiency can be obtained.

The perspective view which shows the external appearance of the throw away bite which concerns on this embodiment. The disassembled perspective view of the throw away bite concerning this embodiment. The perspective view which shows the processing apparatus using the throw away bite concerning this embodiment.

Hereinafter, an example of the throw-away tool 1 according to the present invention will be described with reference to the drawings.
FIG. 1 shows a state in which a throw-away tip 2 (hereinafter simply referred to as “chip 2”) is attached to the shank 3, and FIG. 2 is an exploded perspective view showing a mounting procedure of the tip 2. As shown in FIG. FIG. 3 shows a processing apparatus that finishes the end faces of two workpieces W using the throw-away tool 1.

(Throw away byte)
As the chip 2 used in the present invention, for example, a chip having a rectangular or rhombus shape and having at least a pair of cutting blades 21 is preferable. Usually, the chip 2 is provided with a through-hole portion 22 through which the screw member 4 is inserted in order to attach the chip 2 to the shank 3. It is particularly preferable that the pair of cutting blades 21 are located in opposite directions with the through-hole portion 22 interposed therebetween. That is, when the work point of the force applied from the workpiece W to the cutting edge 21 of the chip 2 is at the reference position with respect to the through-hole portion 22 when the workpiece W is processed, a twisting force is applied to the shank 3 via the chip 2. There is no. Therefore, the chip 2 does not vibrate during processing, and smooth cutting can be performed.

  The rectangular chip 2 is attached to the shank 3 by, for example, one screw member 4. The shank 3 is formed with a seating surface 31 for receiving the chip 2. A concave portion 32 having a shape that is one step lower than the seat surface 31 is formed at a substantially central position of the seat surface 31. Furthermore, a screw hole 33 into which the screw member 4 is screwed is formed in the middle of the concave portion 32. Of the bottom surface 23 of the chip 2, the outer bottom surface 23 excluding the peripheral region of the through-hole portion 22 contacts the seat surface 31 of the shank 3. As a result, when an external force acting on the chip 2 is seen when the chip 2 is fixed, the screw member 4 applies a pressing force in the vicinity of the through-hole portion 22, and a reaction force opposite to the pressing force is generated from the through-hole portion 22. It acts on the bottom surface 23 of the chip 2 at a spaced position.

  With this configuration, when the workpiece W is processed, the fastening force by the screw member 4 and the cutting reaction force from the workpiece W act on the chip 2 as a pressing force. On the other hand, a reaction force acts in the direction of pushing up the chip 2 from the seating surface 31 around the recess 32. Thus, when the reaction position of the reaction force from the seat surface 31 is brought close to the position of the tip 2, when the cutting reaction force acts on the tip 2, the cutting reaction force acting on the cutting edge side with the seat surface 31 as a fulcrum. The moment of the fastening force applied to the chip 2 by the screw member 4 is larger than the moment of. As a result, the fixed state of the chip 2 becomes extremely stable. Therefore, it is possible to obtain a throw-away tool 1 that is less prone to vibration during cutting and that has excellent cutting accuracy.

  In the throw-away tool 1 of the present embodiment, four first wall portions K1 to K4 are formed around the seat surface 31 of the shank 3 so as to surround the chip 2. In the throw-away tool 1 of the present embodiment, the outer surface M of the chip 2 is configured to be able to contact each of the wall portions K1 to K4. The outer surface M of the chip 2 is not parallel to the normal direction of the seating surface 31 but is inclined so as to be constricted toward the bottom surface 23 in order to form a clearance surface for the workpiece W.

  When the chip 2 is pressed against the seating surface 31 by the screw member 4, the outer surface M of the chip 2 immediately before the bottom surface 23 of the chip 2 abuts against the seating surface 31 using the inclination of the outer surface M of the chip. It is preferable that the first wall portion K1 to the fourth wall portion K4 are configured to contact each other. With this configuration, when the bottom surface 23 of the chip 2 comes into contact with the seat surface 31, the outer surface M of the chip 2 comes into close contact with the first wall portion K1 to the fourth wall portion K4 to obtain a very strong fixed state. Can do.

  The contact between the outer surface M of the chip 2 and the first wall portion K1 to the fourth wall portion K4 does not have to be in contact with all four surfaces. For example, only the first wall K1 and the second wall K2 of the two surfaces positioned on the proximal end side of the shank 3 with respect to the screw hole 33 may be in contact with the outer surface M of the chip 2. In this case, a lateral force from the first wall portion K1 and the second wall portion K2, that is, a force that pushes the tip 2 toward the tip end side of the shank 3 acts on the tip 2. The reaction force against this is a force that acts on the inner surface of the through hole portion 22 of the chip 2 from the side surface of the screw member 4. Even with such a configuration, the fixed state of the chip 2 can be stabilized when the workpiece W is cut. In addition, what the outer surface M of the chip | tip 2 and the 1st wall part K1 and the 2nd wall part K2 contact | abut on two surfaces is suitable when the cutting force of the workpiece | work W is small.

(Processing equipment)
In FIG. 3, the processing apparatus S which processes two workpiece | work W simultaneously is shown.
The processing apparatus S holds the throw-away tool 1, and includes a feed mechanism having a clamp portion 5 that can move the throw-away tool 1 along at least one direction and toward the work W, and the throw-away tool 1. A first spindle S1 and a second spindle S2 are provided as work holding portions for holding the work W in a rotating state with respect to the feed locus.

  The positions of the clamp portions 5 can be adjusted along the YZ direction shown in FIG. The reason for omitting the adjustment mechanism in the X direction is to simplify the clamp unit 5 that is fed and driven, for example, to reduce the weight of the clamp unit 5 and to reduce the size of the drive motor. In the present embodiment, the held throw away bit 1 is configured to be capable of feeding in particular along the Y direction. The throw away bit 1 is fixed to the clamp portion 5 in a state in which its longitudinal direction coincides with the Y direction. As a result, the feeding operation of the throw away bit 1 is performed in a state where the cutting blades 21 of the tip 2 protrude on both sides of the throw away bit 1. The position adjustment in the YZ direction may be either manual or automatic. However, in order to ensure the cutting accuracy, it is preferable that the feed operation and the return operation in the Y direction are automatically performed by a motor drive or the like.

  The first spindle S1 and the second spindle S2 hold the workpiece W to be cut by the various chuck portions 6 and are driven to rotate around the rotation axis A along the X direction. Among these, the position of the first spindle S1 can be adjusted, for example, in the XYZ directions. Each adjustment is performed by a known slide mechanism or screw mechanism. The rotational axis A of the workpiece W is set perpendicular to the Y direction that is the feed direction of the throw-away tool 1. Thereby, the end surface of the rotating workpiece | work W can be finished in a highly accurate plane.

  On the other hand, the position of the second spindle S2 can be adjusted in two directions, the X direction and the Z direction, in order to further simplify the mechanism. The adjustment in the Y direction can be dealt with by adjusting the positions of the clamp part 5 and the first spindle S1. Note that a position adjusting mechanism in the Y direction may be provided for the second spindle S2. In that case, the position adjustment between the workpiece W and the chip 2 can be performed more quickly.

  Each spindle can be easily aligned by aligning the position of the workpiece W with the position of the cutting edge 21 of the chip 2, for example. Both of the workpieces W held on the first spindle S1 and the second spindle S2 are cut under the same conditions. For this purpose, the rotation speeds of both spindles S1 and S2 are set to be equal, and the cutting depth of the cutting edge 21 of the chip 2 is made the same. The rotation direction of the workpiece W is the direction shown in FIG. At the time of cutting, the cutting edge 21 of the chip 2 is fed to move from the outer diameter position of the rotating workpiece W toward the rotation axis A. By aligning the cutting conditions of both the workpieces W, the vibration of the chip 2 at the time of cutting can be suppressed, and the processing accuracy of the workpieces W can be increased.

  As described above, with the throw-away tip 2 and the processing apparatus S according to the present invention, two workpieces W are simultaneously cut using the two cutting blades 21 among the cutting blades 21 formed on one chip 2. be able to. Therefore, the number of operations for feeding the chip 2 is halved, and the machining efficiency of the workpiece W can be greatly increased.

  The present invention can be widely applied to metal parts cutting using a throw-away tip.

DESCRIPTION OF SYMBOLS 1 Throw away tool 2 Throw away tip 21 Cutting blade 22 Through-hole part 3 Shank 31 Seat surface 33 Screw hole 4 Screw member 6 Chuck part K1-K4 1st wall part thru | or 4th wall part S Processing apparatus W Workpiece

Claims (2)

With a shank for attaching a rectangular throwaway tip having at least a pair of blade parts,
In the shank,
A seating surface that receives the throw-away tip in a state in which each of the pair of blade portions protrudes on the opposite side across the shank;
A first wall portion to a fourth wall portion formed around the seating surface and respectively facing the four side surfaces of the throw-away tip;
In order to fix the throw-away tip to the shank, the throw-away has a screw hole provided in the seating surface so that a screw member inserted into a through-hole portion formed in the throw-away tip can be screwed. Part-Time Job. A clamp portion for holding the throw-away tool according to claim 1;
Two workpiece holding parts that hold the two workpieces that are cut by the throw-away tip so that they can rotate separately, and can change the position of each workpiece with respect to the movement trajectory of the throw-away tip,
A feed that holds the clamp part and holds the throw away bite so that it can be withdrawn and retracted along at least one feed direction with respect to the rotating two workpieces so as to cut each of the two workpieces simultaneously. And a processing device.

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