JP2005199428A - Blade exchanging type chip and fixing structure for round chip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing method for a blade exchanging type tip by which a round chip can be rotated by a fixed rotation angle in order to reuse a used blade portion and to avoid disposal of a blade while it is remained in an unused condition. <P>SOLUTION: The fixing structure for the blade exchanging type tip has a depression of a reverse truncated pyramid shape in a rake face and has an angle θ made by the flank of the reverse truncated pyramid and the rake face being 30 to 85 degrees. A round chip 1 is fixed by a holder 14 and a pressing tool 10. The holder 14 has a screw hole 15 for a cap screw, a first sliding face 12 for fixing the round chip and a notch for retaining the round chip at a tip. The round chip pressing tool 10 has a round head drawing pin 13, a long hole 16 for the cap screw and a second sliding face 12' for fixing the round chip. When the round chip pressing 10 is tightened in the holder 14 with the cap screw 11, the pressing tool 10 is moved downward and backward along the first sliding face 12, the pressure welding of the second sliding face 12' and the first sliding face 12 is carried out, and the round chip 1 is retained firmly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a blade tip replaceable round tip using a sintered body having a high hardness and a fixing structure of the round tip, and particularly used in the field of heavy cutting, and a round tip having a concave portion in the center portion with a blade tip exchange type and It relates to the fixing structure.

  A cemented carbide or ceramic round tip provided with a recess at the center of the round tip is well known. As an example, there is a throwaway bit in which an inverted conical hole is provided in a polygonal tip to increase the holding force of the tip (for example, see Patent Document 1).

  In addition, a cutting tool in which a horizontally long depression is provided in a polygonal oxide ceramic cutting tool such as aluminum oxide or zirconium oxide is also known (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 51-24626 (1st page, Fig. 4) JP 58-59706 (page 1-2, Fig. 2)

  The round insert is cut by rotating the used cutting edge and using the next new cutting edge. Therefore, the round tip has the advantage that all round cutting edges can be used, but there is a problem that the rotation angle of the round tip after use is not constant. The rotation angle determines the number of times one chip is used and affects the finished state of the cutting surface.

  Conventionally, since the rotation angle relies on the operator's feeling, there is a problem that the amount of tool used varies from person to person. At the same time, the rotation angle is insufficient, and the used cutting blade may be used again. In this case, since a worn cutting edge is used, the work surface is deteriorated or the tool is damaged, which is a problem. The present invention seeks to provide a tool shape and its holder so that the rotation angle after use is constant.

  On the other hand, as another problem, a chip having a recess at the center is not yet put into practical use in an ultra-high pressure sintered body. The ultra-high pressure sintered body is obtained by sintering diamond powder, CBN (cubic boron nitride) powder or the like under sintering conditions of a pressure of several GPa and a temperature of 1000 ° C. or higher. Since this material has a very high hardness, there is a problem that the cost required for processing such as providing a recess is high and there is no economical efficiency as a chip. It is known that these materials can be generally processed by laser processing, electric discharge wire processing, ordinary electric discharge processing, or the like. However, none of the above methods could be realized due to economic problems to process the recesses on the surface of the chip.

  The blade tip replaceable tip of the present invention is a round tip, and has a recess having an inverted truncated pyramid shape on the rake face of the round tip, and an angle θ between the inclined surface forming the inverted truncated pyramid shape and the rake face is 30. ° to 85 °. By using the above-described inverted pyramid as a forward and reverse pyramid, a round tip can be used without waste.

  The slope forming the inverted truncated pyramid may be concave. Moreover, if a sign such as a number is attached to the rake face facing the plurality of slopes, all parts can be used without error. The rake face of the round tip can be formed of a cubic boron nitride sintered body or a diamond sintered body.

  Another invention is a fixing structure for attaching a round tip to a holder using a presser screw and a round tip presser, and the holder includes a screw hole for a presser screw, a first sliding surface for fixing the round tip, The tip of the holder has a notch for holding a round tip, and the round tip retainer has a round tip retracting pin, a long hole for a press screw, and a second sliding surface for fixing the round tip. Then, by tightening the round chip presser to the holder, the first sliding surface and the second sliding surface are pressed together, and the round chip and the round chip retracting pin are pressed and fixed. In addition, the rake face of the round tip has an inverted truncated pyramid-shaped recess, and the angle θ between the inclined surface forming the inverted truncated pyramid shape and the rake face can be set to 30 to 85 °.

  The present invention intends to use a round insert efficiently in the cutting field, and selects the number of corners of the polygonal inverted truncated cone at the center according to the cutting conditions, and always replaces the cutting edge to guarantee the number of uses as designed. An expression chip and its fixing structure can be provided. According to the present invention, it has become possible to perform heavy cutting of hardened steel and the like, which has been impossible in the past, using a round tip made of an ultra-high pressure sintered body.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 (A) is a perspective view of the round chip of the present invention, and FIG. 1 (B) is an XX cross-sectional view passing through the center of the side of FIG. 1 (A). In FIG. 1 (B), θ is an angle formed by the rake face 2 and the slope of the inverted truncated pyramid. The inverted truncated pyramid-shaped indentation is composed of slopes 3, 4, 5, etc. and a bottom face 6. If the rake face corresponding to each slope is marked with 7, 8, 9, etc., it becomes easier to manage the used cutting edge. An example of a round tip shown in FIG. 1 has a diameter of 10 mm, a thickness of 3.9 mm, a depth of the inverted truncated pyramid of 1.2 mm, a length of one side of the inverted truncated pyramid on the rake face 2 of 4 mm, and θ of 60 °. Met. The round tip of the present invention is suitable for a diameter of 5 to 25 mm, and the depth of the inverted truncated pyramid is suitably 10 to 50% of the thickness of the round tip.

  FIG. 2A shows a state in which the round chip 1 is held using the holder 14 and the round chip presser 10. The holder 14 has a notch for holding a round tip at the tip, a screw hole 15 for a presser screw, and a first position provided at a position facing the notch across the presser screw 11 (right side in FIG. 2 (A)). And a sliding surface 12. The round tip retainer 10 is provided at one end (the same left side) with a round tip retracting pin 13 that contacts the round tip 1, a long hole 16 for a presser screw provided in the middle, and the other end (the same right side). And a second sliding surface 12 ′ that abuts the first sliding surface 12 of the holder 14. The round chip 1 is held at one end side (front end portion), and the second sliding surface 12 ′ straddles the first sliding surface 12 of the holder 14 at the rear portion. As shown in FIG. 2 (A), when the round chip presser 10 is placed in the holder 14 and the presser screw 11 of the holder 14 is tightened into the screw hole 15, the screw 11 is in the long hole 16 for the presser screw. In the round tip presser 10, the second sliding surface 12 ′ is pulled rearward and obliquely downward along the first sliding surface 12. At that time, the round chip 1 is also pulled rearward by the round chip drawing pin 13 at the tip, and is fixed to the holder 14.

  In FIG. 2 (B), the round tip retracting pin 13 is restrained by two inclined surfaces of the inverted truncated pyramid provided on the round tip 1 and pulls in the round tip 1. Such a two-sided pull-in pin constraint can also be used. In FIG. 2 (B), the retracting pin 13 has a cylindrical shape, but is not limited to a cylindrical shape. The shape of the round tip pull-in pin can further increase the holding strength by contacting the inclined surface at many points. The shape of the round chip lead-in pin in FIG. 2 (B) may be a square shape or a shape with the ridges lying sideways.

  When cutting is performed with the round tip thus fixed, and the cutting blade has reached the end of its life, the round tip is rotated so that a new cutting blade is removed from the holder, and the next cutting is started.

  The following description is different from the previous example, in which the lead-in pin hits only one slope, and will be described in more detail with reference to FIG. First, when the round tip 1 is fixed using the first inclined surface 3, the work material is cut with a cutting blade facing the first inclined surface 3. The cutting edge is marked with a single point 7. When the life of the cutting edge facing the first slope 3 comes, next, the round tip 1 is fixed using the second slope 4. Cutting is performed with a cutting blade facing the second inclined surface 4, and a reference numeral 8 consisting of two points is attached thereto. Similarly, the round tip 1 is fixed and cut using the next slope 5. This surface is labeled 9. By repeating such an operation, the round tip can be used efficiently. In addition, when the round chip is held at a position as shown in FIG. 2A, it is desirable that the cutting blade code be attached to the cutting blade facing the holding portion.

  At this time, the range of chips that cannot be used by cutting is determined by the cutting conditions. Accordingly, when the cutting conditions are determined, the range of the cutting edge that cannot be used is determined. Therefore, it is possible to determine the number of times of use in advance and determine the number of corners of the inverted truncated pyramid to purchase a round insert. Conversely, the cutting conditions can be determined according to the chip.

  In the present invention, if the angle formed by the slopes forming the polyhedron and the rake face is θ, the angle is preferably in the range of 30 ° to 85 °. If the angle is less than 30 °, when the round tip presser 10 is tightened with the screw 11, the pulling force of the round tip is insufficient, so that it cannot be firmly fixed. If the angle exceeds 85 °, the downward pressing force will be insufficient, and it will not be possible to fix firmly.

  The present invention can also be applied to ceramic tools, cemented carbide tools, cermet tools, and ultra-high pressure sintered bodies. Since these tool materials are fragile, it is desirable that the intersection line formed by the slopes of the inverted truncated pyramid shape is rounded. This rounded shape is preferably about 10% or less of one side of the inverted truncated pyramid. If there is no rounded portion, stress concentration may occur during heavy cutting, which may cause cracks.

  Since the inverted pyramid is formed of a mold in ceramic, cemented carbide or cermet, it can be industrially manufactured relatively easily. However, the present invention is particularly effective in the case of a cubic boron nitride (CBN) sintered body or a so-called ultrahigh pressure sintered body of a diamond sintered body. In particular, in the case of a CBN sintered body, hardened steel or the like having high hardness is cut, so that the cutting force is large and the round chip must be fixed particularly severely. In addition, since the ultra-high pressure sintered body has high hardness, it is particularly difficult to provide a recess on the surface. Unlike jewelry, art goods, and other expensive and non-priced products, the product of the present invention, which is an industrial product, must be priced accordingly.

  The present invention has been achieved for the first time by a laser processing method that has been found through various attempts to process the surface of an ultra-high pressure sintered body. As the laser light source, a YAG laser having a wavelength of 1064 nm, which is generally used industrially as a laser for fine processing, is used. Also, a semiconductor laser having a transmitted light close to the same wavelength can be used. While adjusting the output of the laser beam and simultaneously controlling the transmission frequency and processing pitch using a high-power pulse YAG laser with enhanced light condensing performance by a galvanometer mirror, while digging with a constant processing amount in a contour line Processing. In this laser processing method, it is possible to reduce the thermal influence on the processed surface by suppressing the total output of the laser light and increasing the light collection degree. For example, the present invention can be achieved by using DML40 manufactured by DECKEL MAHO.

  The slope may be a flat surface or a concave surface with respect to the rake face. An example of the concave surface is shown in FIG. In FIG. 3 (A), the slopes 3, 4, 5 and the like are beer barrels, and the slopes are curved. FIG. 3 (B) shows a state where the round tip retracting pin 13 is pressed in the YY sectional view passing through the center of the side of the indentation in FIG. 3 (A). In this case, θ is an angle formed by the rake line and the rake line at the portion where the round tip pull-in pin 13 contacts the curved surface in FIG. 3 (B). The slope may be a part of a truncated cone having a large radius, but at that time θ is constant.

  Also in the present invention, the round tip 1 has an inverted truncated pyramid-shaped recess at the center of the rake face 2, and the cutting edge facing the first slope 3 is denoted by reference numeral 7, and similarly the cutting face facing the second slope 4 is provided. Reference numeral 8 can be attached to the blade, and reference numeral 9 can be attached to the cutting edge facing the third inclined surface 5. As in FIG. 1, the symbols are shown by the number of points, but other numbers, alphabets, etc. can be added.

  Provided is a blade tip exchange type round chip fixing method having a concave portion at the center, and makes it possible to use an ultra-high pressure sintered body in the heavy cutting field.

FIG. 1 (A) is a perspective view of a round chip obtained by the present invention, and FIG. 1 (B) is a schematic cross-sectional view taken along the line XX of FIG. 1 (A). FIG. 2 (A) is a ZZ cross-sectional view of FIG. 2 (B), a side cross-sectional view showing a state where the round chip obtained by the present invention is held by a holder, and FIG. 2 (B) is obtained by the present invention. It is an upper surface outline figure which shows the state which hold | maintained the round chip | tip with the holder. FIG. 3 (A) is a front view of the round tip of the present invention, and FIG. 3 (B) is a YY cross-sectional view of FIG. 3 (A) in a state where the round tip drawing pin is in contact.

Explanation of symbols

1 round tip
2 Rake face
3 First slope
4 Second slope
5 Third slope
6 Bottom
7 Sign of the cutting edge facing the first slope
8 Symbol of the cutting edge facing the second slope
9 Symbol of the cutting edge facing the third slope
10 Round insert presser
11 Presser screw
12 First slip surface
12 'Second slip surface
13 Round insert lead pin
14 Holder
15 Screw holes
16 Slotted hole

Claims (7)

  A blade-tip-replaceable tip having an inverted truncated pyramid-shaped recess on the rake face of the round tip, and an angle θ between the slope forming the inverted truncated pyramid shape and the rake face is 30 to 85 °.   The tip replacement type tip according to claim 1, wherein the inverted truncated pyramid is an inverted regular truncated pyramid.   The blade tip replaceable tip according to claim 1 or 2, wherein the slope forming the inverted truncated pyramid is concave.   4. The blade tip replaceable tip according to claim 1, wherein a sign is attached to a rake face that faces the plurality of inclined surfaces.   5. The blade tip replaceable tip according to claim 1, wherein a rake face of the round tip is formed of a cubic boron nitride sintered body or a diamond sintered body. A fixing structure that attaches the round tip to the holder using a presser screw and round tip presser,
The holder has a screw hole for a presser screw, a first sliding surface for fixing a round tip, and a notch for holding a round tip at the tip of the holder,
The round tip presser has a round tip retracting pin, a slot for a presser screw, and a second sliding surface for fixing the round tip,
The round tip presser is fastened to the holder with the presser screw so that the first sliding surface and the second sliding surface are pressed against each other, and the round tip is fixed to the notch with the round tip retracting pin. Chip fixing structure.   7. The rake face of the round tip has an inverted truncated pyramid-shaped recess, and an angle [theta] between the slope forming the inverted truncated pyramid shape and the rake face is 30 to 85 [deg.]. Fixed round chip fixing structure.

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