JP3817568B2 - Carbide blade grinding tool and method of manufacturing carbide tool - Google Patents

Description

  The present invention provides a method for manufacturing a cemented carbide tool in which a part of a cemented carbide blade is ground to form a recessed part recessed in a stepped shape, and a diamond sintered plate material is embedded in the recessed part to form part of the cemented carbide blade. The present invention also relates to a cemented carbide grinding tool for grinding such a recess into a cemented carbide blade.

Conventionally, for example, grinding tools 1 and 3 shown in FIGS. 13 and 14 have been used to grind a concave portion for burying a diamond sintered plate material in a part of a cemented carbide blade. The grinding tool 1 in FIG. 13 has a structure in which a cylindrical grindstone portion 2 electrodeposited with diamond particles is provided at the tip. 14 is an improved product of the grinding tool 1 of FIG. 13, and is provided with a groove 2A on the outer peripheral surface of the grindstone 2 to improve the grinding efficiency (for example, Patent Document 1). 1).
Japanese Utility Model Publication No. 58-169953 (Figs. 2 and 4)

  By the way, before grinding the said recessed part in a cemented carbide blade, the cemented carbide blade itself is cut out from a hard-steel material shaft, for example using a disk-shaped grindstone. At this time, the disk-shaped grindstone is attached to a machine tool such as a grinding machine or a machining center, and is driven at a rotational speed of, for example, 3000 to 5000 rpm. However, the machining contact surface on the outer periphery of the disk-shaped grindstone is very small. Was possible.

  However, since the grinding wheel portion 2 of the grinding tools 1 and 3 described above has a sufficiently small diameter size and a sufficiently large processing contact surface of the grinding wheel portion 2 with respect to the diameter size, In order to obtain the equivalent peripheral speed, it was necessary to sufficiently increase the number of rotations of the grinding tools 1 and 3 (for example, up to about 50000 rpm).

  However, even if a special machine tool (for example, a machining center or a grinding machine) equipped with a speed increasing device is used, the rotational speed cannot be increased sufficiently, and the limit is about 12000 rpm. When the grinding tool 1 of FIG. 13 is driven to rotate at about 12000 rpm, it takes a long time (several days) to grind the concave portion for burying the diamond sintered plate material on the carbide blade. The manufacturing cost was high. In addition, a special machine tool equipped with a speed increasing device is expensive, and this also increases the manufacturing cost. Further, when the high-speed air spindle is used, the grinding tool 1 can be rotationally driven at 50000 rpm and the grinding efficiency is improved. However, there arises a problem that the tool life is shortened and the equipment cost is increased.

  On the other hand, when the grinding tool 3 of FIG. 14 is used, the grinding efficiency is improved. For example, even when the rotational speed is about 850 rpm (that is, using a normal machine tool), the grinding tool 3 of FIG. Compared with the grinding tool 1, it is possible to shorten the grinding time. However, as the grinding efficiency improves, the amount of grinding waste generated per unit time also increases, so that grinding waste is sandwiched between the tip surface 2B (see FIG. 14) of the grindstone portion 2 and the bottom surface 4A of the recess 4, There has been a problem that processing accuracy is lowered. And the number of NG products increased, and as a result, the manufacturing cost of carbide tools was high. In addition, when the grinding tool 1 of FIG. 13 is rotated at a high speed using a high-speed air spindle, the problem of grinding dust similarly occurs.

  In addition to the above problem, in the concave portion 4 ground by using the conventional grinding tools 1 and 3, as shown in FIG. 15, the corner 4C between the bottom surface 4A and the stepped surface 4B of the concave portion 4 is sintered with diamond. The board 5 may get on. On the other hand, the chamfering may be additionally processed at the bottom of the diamond sintered plate material 5, but it is difficult to additionally process the chamfering so as to have a dimension corresponding to the corner 4C of the recess 4. For this reason, it is not possible to reliably prevent the diamond sintered plate material 5 from climbing on the corner portion 4C of the recess 4, and the amount of NG products increases due to variations in positioning accuracy and the like, which also increases the manufacturing cost of the carbide tool. It was the cause of the increase.

  This invention is made | formed in view of the said situation, and it aims at provision of the manufacturing method of a cemented carbide tool and a cemented carbide blade grinding tool which can reduce manufacturing cost conventionally.

A carbide blade grinding tool according to the invention of claim 1 made for achieving the above object is for grinding a recess for embedding a diamond sintered plate material in a part of a carbide blade, In a cemented carbide grinding tool that has a grindstone part that is electrodeposited with diamond particles at the tip of the mounting shaft that can be attached to the rotary drive shaft of the machine, the grindstone part expands toward the tip. In addition, the outer peripheral surface has a truncated cone shape with an inclination of 3 to 4 degrees with respect to the axial direction, and the front end surface of the grindstone portion has a concave shape gradually recessed from the outer peripheral edge toward the center. Is formed with a groove portion that is open to the outer peripheral surface and the tip surface, and the groove portion includes a first inner surface that is substantially parallel to the axial direction of the grindstone portion, and a second inner surface that is inclined with respect to the axial direction of the grindstone portion. An inner ridge line formed by intersecting the first and second inner surfaces, and One end portion of the side ridge, located in the opening edge of the grinding wheel portion of the forward end surface to the formed center hole, a second inner surface, disposed rearwardly of the first inner surface in the rotational direction of the groove, the second It is characterized in that the ridge line between the inner surface and the outer peripheral surface of the grindstone portion is inclined by 60 ± 10 degrees with respect to the axial direction of the grindstone portion.

According to a second aspect of the present invention, in the cemented carbide blade grinding tool according to the first aspect, 0.02 to 0 at the tip outer edge portion of the conical metal portion that is an electrodeposition target object of diamond powder in the grindstone portion. It is characterized by a chamfering process of 0.08 mm .

According to a third aspect of the present invention, there is provided a method for manufacturing a cemented carbide tool in which a cemented carbide blade is formed by grinding a part of a cemented carbide blade to form a recess recessed into a stepped shape, and embedding a diamond sintered plate material in the recess. the method of manufacturing a part and the cemented carbide tool, the stepped surface of the cemented carbide blade with a grinding tool by grinding a recess in carbide blade and the recess of claim 1 or 2, carbide blade grinding tool By pressing the outer peripheral surface of the grindstone portion, the stepped surface of the recess is inclined toward the side covering the bottom surface of the recessed portion, and the side surface of the diamond sintered plate material is abutted against the stepped surface and positioned.

According to a fourth aspect of the present invention, in the method for manufacturing a cemented carbide tool according to the third aspect , the cemented carbide alloy plate is laminated and sintered on the back surface of the sintered plate material main body made of only the diamond sintered material, and the concave portion is formed. Measuring the depth of the concave portion after grinding, a step of surface grinding the cemented carbide plate so that the thickness of the entire sintered diamond plate material corresponds to the depth of the concave portion, and the diamond sintered plate material And the step of brazing the cemented carbide plate to the bottom surface of the recess.

[Inventions of Claims 1 and 3 ]
According to the first and third aspects of the present invention, since the groove portion is provided in the grindstone portion of the cemented carbide blade grinding tool, the grinding time of the concave portion to the carbide blade is shortened compared to the conventional grinding tool having no groove portion. The Moreover, it can be mounted on a normal machine tool that does not have a speed increasing device for grinding. Furthermore, since the front end surface in the grindstone part of the carbide blade grinding tool according to the present invention has a concave shape, a space capable of accommodating grinding waste is formed between the front end surface of the grindstone part and the bottom surface of the concave part. Is done. Thereby, the fall of the processing precision resulting from grinding waste is prevented, and NG products can be reduced. Moreover, since the outer peripheral surface of the grindstone portion is inclined, the step surface of the recess formed in the carbide blade is also inclined, and the corner between the bottom surface and the step surface of the recess is formed from the side surface of the diamond sintered plate material. Can be released. As a result, the diamond sintered plate material does not run over the corners in the recess, the contact position between the step surface of the recess and the side surface of the diamond sintered plate material is stabilized, and the positioning accuracy is improved. Here, since the gradient of the outer peripheral surface of the grindstone portion is 3 to 4 degrees, the gap in the non-contact portion between the step surface of the recess and the side surface of the diamond sintered plate material can be narrowed. Thus, according to the cemented carbide blade grinding tool and the method for manufacturing a cemented carbide tool according to the present invention, the grinding time can be shortened, NG products can be reduced, and the manufacturing cost can be reduced.

Here, the groove portion includes a first inner surface axial direction substantially parallel to the grinding wheel portion, a second inner surface that is inclined relative to the axial direction of the grinding wheel portion, intersect their first and second inner surfaces it was closed and the inner ridge, ridge between the second inner surface and the grindstone portion outer peripheral surface of, since the inclined 60 ± 10 degrees with respect to the axial direction of the grinding wheel portion, a general-cone comprising Grooves can be formed in the carbide blade grinding tool using the shaped grindstone, and the manufacturing cost of the carbide blade grinding tool itself can be reduced. As described above, according to the present invention, the grinding time is shortened, the manufacturing cost of the cemented carbide grinding tool itself is reduced, and the manufacturing cost of the cemented carbide tool can be reduced as compared with the prior art.

[Invention of claim 2 ]
In the cemented carbide blade grinding tool according to claim 2, 0.02 to 0.08 mm of chamfering is performed on the outer edge portion of the conical metal portion, which is an object of electrodeposition of diamond particles in the grindstone portion. Diamond powder particles are easily electrodeposited on the outer edge of the tip of the conical metal member, and variations in the shape of the cemented carbide grinding tool itself are suppressed. Thereby, when grinding is performed using different carbide blade grinding tools, it is possible to suppress variations in the shapes of the ground portions .

[Invention of claim 4 ]
According to the method for manufacturing a cemented carbide tool according to claim 4 , after the recess is ground, the thickness of the entire diamond sintered plate is adjusted to a size corresponding to the depth of the recess, and then the diamond sintered plate The surface of the cemented carbide blade and the surface of the sintered diamond plate material can be surely flushed by brazing the cemented carbide alloy plate at the bottom of the recess.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The cemented carbide grinding tool 10 of this embodiment has the grindstone part 14 at the front-end | tip of the attachment shaft part 11, as shown in FIG. The distal end portion 11A of the mounting shaft portion 11 has a stepped outer diameter, and the base end portion of the grindstone portion 14 has a stepped outer diameter larger than the distal end portion 11A of the mounting shaft portion 11. Yes.

  The cemented carbide grinding tool 10 is manufactured by cutting from a hard steel shaft made of high-speed steel, for example, and center holes 10A and 10B for centering the hard steel shaft are provided at both ends of the cemented carbide grinding tool 10. It is formed at the center of the surface. Further, these center holes 10A and 10B have a shape in which the back side is closed.

  The grindstone portion 14 is obtained by electrodepositing diamond powder particles 16 (see FIG. 3; hereinafter referred to as “diamond powder particles 16”) on the conical metal portion 14S (see FIG. 2) integrally formed with the mounting shaft portion 11. As a whole, it has a truncated cone shape whose outer diameter gradually increases toward the tip side (that is, the side away from the mounting shaft portion 11). 2, the outer peripheral surface 14B of the grindstone portion 14 is, for example, 3 to 4 degrees (angle X in FIG. 2) with respect to the axial direction of the grindstone portion 14 (for example, the direction of the arrow L1 in FIG. 2). It is inclined at a slope of. Furthermore, the front end surface 14C of the grindstone portion 14 gradually increases from the outer peripheral edge toward the center with a gradient of 5 to 7 degrees (angle Y in FIG. 2) with respect to the imaginary surface S1 orthogonal to the axial direction of the grindstone portion 14. It has a recessed concave shape.

  As shown in FIG. 3, the grindstone portion 14 is formed with a plurality of (for example, three) groove portions 15 that are open to the outer peripheral surface 14B and the tip surface 14C. These groove portions 15 have the same shape and are arranged uniformly in the circumferential direction of the grindstone portion 14. Each groove portion 15 includes, for example, a first inner surface 15A substantially parallel to the axial direction of the grindstone portion 14, a second inner surface 15B inclined with respect to the axial direction of the grindstone portion 14, and the first and second inner surfaces. 15A, 15B has an inner ridge line 15C formed by intersecting, and the second inner surface 15B is arranged on the rear side of the first inner surface 15A in the rotation direction of the groove portion 15. Further, one end portion of the inner ridge line 15C of the groove portion 15 is located at the opening edge of the center hole 10B as shown in FIG. Furthermore, the ridge line 15D between the second inner surface 15B and the outer peripheral surface 14B of the grindstone portion 14 is inclined at 60 ± 10 degrees (see angle Z in FIG. 9) with respect to the axial direction of the grindstone portion 14.

  More specifically, as shown in FIG. 4, each groove portion 15 is formed by pressing a conical grindstone 20 against the conical metal portion 14S before the diamond powder particles 16 are electrodeposited. In this cone-shaped grindstone 20, the outer peripheral surface 20B is inclined at an angle of approximately 60 degrees with respect to the end surface 20A. Then, the first and second inner surfaces 15A and 15B of the groove portion 15 are ground by the end surface 20A and the outer peripheral surface 20B of the conical grindstone 20. At this time, the end surface 20 </ b> A of the cone-shaped grindstone 20 is arranged so as to be parallel to the axial direction of the grindstone portion 14. As a result, the first inner surface 15A is substantially parallel to the axial direction of the grindstone portion 14, the second inner surface 15B is inclined with respect to the axial direction, and the ridge line 15D is at an angle of 60 ± 10 degrees with respect to the axial direction. Tilt.

  In the present embodiment, since the first and second inner surfaces 15A and 15B of the groove portion 15 are processed at once by the cone-shaped grindstone 20 that is a general-purpose product, the cemented carbide blade is compared with a case where these are processed separately. The manufacturing cost of the grinding tool 10 can be reduced.

  FIG. 5 shows a state in which the tip surface 14C of the grindstone 14 is viewed from the axial direction. As shown in the figure, a chord G1 connecting both ends of an arcuate outer edge portion between adjacent grooves 15 and 15 on the tip surface 14C, and a circumscribed line L2 of the arcuate outer edge portion parallel to the chord G1 The distance W between them is 1/10 to 1/5 (specifically, approximately 1/8 in this embodiment) with respect to the outer diameter D (for example, 8 mm) of the distal end surface 14C.

  FIG. 6 is an enlarged view of the outer edge portion of the tip of the conical metal portion 14S before the diamond powder particles 16 are electrodeposited. As shown in the drawing, a fine chamfering process is performed on the outer edge of the tip of the conical metal portion 14S. The chamfered tapered surface 14E formed on the conical metal portion 14S by this chamfering process has an angle of, for example, 45 degrees with respect to the axial direction, and the chamfered dimension is, for example, 0.02 to 0.08 mm. Specifically, in the radial direction of the conical metal portion 14S (the left-right direction in the figure), from the tip edge portion 14F of the conical metal portion 14S before the chamfering process to the edge of the chamfered tapered surface 14E after the chamfering process. The dimension L3 is 0.02 to 0.08 mm.

  As shown in FIG. 3, the diamond powder particles 16 are electrodeposited on the entire surface of the conical metal portion 14S, and are also electrodeposited on the chamfered tapered surface 14E as shown in FIG. 7A. Here, if the chamfered metal part 14S is not chamfered, as shown in FIG. 7B, for example, the diamond powder particles 16 are raised at the tip edge part 14F of the conical metal part 14S, thereby After electrodeposition, the shape of the outer edge of the tip of the grindstone 14 may vary, or the diamond powder particles 16 may fall off. However, in the present embodiment, since the chamfering process is performed on the outer peripheral edge portion of the conical metal portion 14S, the above-described situation can be prevented. Further, it is possible to prevent the tip edge portion 14F of the conical metal portion 14S from being chipped. As a result, variation in the shape of the cemented carbide blade grinding tool 10 itself can be suppressed, and when grinding is performed using a different carbide blade grinding tool 10, variation in the shape of the ground portions can be suppressed.

  Next, a method for manufacturing the cemented carbide tool 30 shown in FIG. 8 using the cemented carbide blade grinding tool 10 of the present embodiment having the above-described configuration will be described. The cemented carbide tool 30 is formed by grinding a cemented carbide shaft and has a blade portion 30H at the tip of the shaft portion 30S. The blade portion 30H includes a small-diameter portion 30H2 coaxially with the tip of the large-diameter portion 30H1, and has a structure in which the tip of the small-diameter portion 30H2 is tapered. A plurality of carbide blades 31 are formed on the peripheral surface of the blade portion 30H, and each of the carbide blades 31 extends in the axial direction of the carbide tool 30 across the large diameter portion 30H1 and the small diameter portion 30H2. Yes.

  Of the plurality of carbide blades 31, a predetermined carbide blade 31 is formed with a pair of recesses 32, 32 having different shapes from each other at two locations in the axial direction. These concave portions 32 and 32 are stepped by grinding a flat portion of the carbide blade 31. The one concave portion 32 has a substantially semicircular planar shape, and is formed over a position slightly approaching the small diameter portion 30H2 from the distal end portion of the large diameter portion 30H1. The other concave portion 32 has a substantially fan-shaped planar shape and is formed from the distal end portion of the small diameter portion 30H2 to the tapered distal end portion. Further, the arc portion of the substantially semicircular recess 32 has a larger radius of curvature than the arc portion of the approximately fan-shaped recess 32. And the diamond sintered plate materials 35 and 35 of the shape corresponding to each recessed part 32 and 32 are embed | buried under each recessed part 32 and 32, respectively, and become a part of the cemented carbide blade 31. FIG.

  As shown in FIG. 11, the diamond sintered plate material 35 has a structure in which a cemented carbide plate 35B is stacked on the back surface of a sintered plate material main body portion 35A made of only a diamond sintered material. Specifically, the sintered plate material main body portion 35A and the cemented carbide plate 35B are stacked and pressed against each other with ultra high pressure, and heated at an ultra high temperature in this state, thereby causing the sintered plate material main body portion 35A and the cemented carbide plate 35B to Is sintered to form a diamond sintered plate material 35. The overall plate thickness of the diamond sintered plate material 35 is, for example, 1.4 mm, and the thickness of the sintered plate material body 35A is 0.2 or 0.5 mm.

  In order to manufacture the cemented carbide tool 30, two types of cemented carbide grinding tools 10 having different grindstone diameters are prepared for the substantially sector-shaped recess 32 and the substantially semicircular recess 32. Each of these carbide blade grinding tools 10 is fixed to a tool shank (not shown) that can be attached to and detached from the main spindle of the machining center (corresponding to the “rotary drive shaft of the machine tool” according to the present invention). (Not shown). Also, as a workpiece, a carbide tool 30 is prepared in which a plurality of carbide blades 31 are ground in advance and the concave portions 32 and 32 are not processed. Then, the carbide tool 30 as the workpiece is attached to a workpiece jig (not shown) of the machining center.

  Further, in another machining jig (not shown) of the machining center, each diamond sintered plate material processed into a semicircular shape and a substantially fan shape in advance corresponding to the substantially fan-shaped and substantially semicircular concave portions 32, 32. 35 and 35 are fixed. Specifically, the sintered plate material body 35A side of the diamond sintered plate material 35 is fixed to the flat surface of the work jig with an adhesive. As this adhesive, one that can remove the adhesive effect by adding a special debonding liquid is used.

  When the above preparation is completed, start the machining center. Then, one carbide blade grinding tool 10 having a relatively small diameter of the grindstone portion 14 is attached to the spindle of the machining center via the tool shank. Then, as shown in FIG. 9, the axial direction of the cemented carbide blade grinding tool 10 is directed in a direction orthogonal to the flat surface 31 </ b> H of the cemented carbide blade 31. It is arranged at a position separated from the side. At this time, the tip surface 14 </ b> C of the carbide blade grinding tool 10 is positioned at a position where it sinks 0.2 mm (see dimension t in FIG. 9) with respect to the flat surface 31 </ b> H of the carbide blade 31.

  Next, the carbide blade grinding tool 10 is driven to rotate at, for example, about 800 to 900 rpm and moves in a direction orthogonal to the rotation axis, and the outer peripheral surface 14 </ b> B of the grindstone portion 14 is pressed against the carbide blade 31. Thereby, the flat part of the cemented carbide blade 31 is ground, and the substantially fan-shaped recessed part 32 is processed in the front-end | tip part of the blade part 30H. In detail, it grinds comparatively deep so that the cemented carbide which comprises the cemented carbide blade 31 in the outer peripheral surface 14B of the grindstone part 14 may be cut with the ridgeline 15D of the groove part 15, and the part other than the groove part 15 in the outer peripheral surface 14B Grind to increase surface roughness. Thereby, the carbide blade 31 can be efficiently ground as compared with a conventional carbide blade grinding tool that does not have the groove 15. Then, when the carbide blade 31 is ground by 0.2 mm at a set value, the carbide blade grinding tool 10 is detached from the carbide tool 30 and ground by the carbide blade grinding tool 10 by a measuring instrument provided in the machining center. The depth of the substantially fan-shaped recess 32 is automatically measured. Then, the difference between the set value of 0.2 mm and the actually measured value is obtained as an attachment error dimension of the cemented carbide grinding tool 10 with respect to the spindle of the machining center.

  Next, the tip surface 14C of the cemented carbide grinding tool 10 is again placed at a predetermined position with respect to the flat surface 31H so that the actual recess 32 has a depth of 1.4 mm, reflecting this attachment error dimension. Is done. Then, the cemented carbide blade grinding tool 10 moves in a direction perpendicular to the rotation axis, and the cemented carbide blade 31 is ground to form a fan-shaped concave portion 32 having a depth of 1.4 mm.

By the way, grinding waste is generated during grinding with the carbide blade grinding tool 10. However, in the cemented carbide blade grinding tool 10 of the present embodiment, the front end surface 14C of the grindstone portion 14 has a concave shape, and therefore, grinding dust is provided between the front end surface 14C of the grindstone portion 14 and the bottom surface 32C of the concave portion 32. A space capable of accommodating the is formed. As a result, even if grinding debris is sandwiched between the front end surface 14C of the grindstone portion 14 and the bottom surface 32C of the recess 32, it is accommodated in the space and is ground from the gap between the outer peripheral surface 14B of the grindstone portion 14 and the step surface 32B. Waste is discharged, and the position of the cemented carbide grinding tool 10 does not vary in the axial direction, thereby preventing a reduction in processing accuracy due to grinding waste. In particular, in the present embodiment, since the entire tip surface 14C of the grindstone portion 14 does not overlap the carbide blade 31 (see the two-dot chain line in FIG. 9), the grinding scrap passes through the above-described space and the carbide blade. It is efficiently excluded from the 31 blade edge side.
In addition, in another workpiece, when processing is performed so that the entire tip surface 14C of the grindstone portion 14 overlaps the workpiece, the grinding waste accommodated in the space described above is pressed against the workpiece on the circumferential surface of the grindstone portion 14. On the side opposite to the formed portion, the space 15 is discharged to the outside through the groove 15.

  When all the substantially sector-shaped recesses 32 necessary for the carbide tool 30 are processed, the depth is automatically measured for each of the approximately sector-shaped recesses 32. Then, the tool is changed, and the other carbide blade grinding tool 10 having a relatively large grindstone diameter is attached to the spindle of the machining center, and the carbide blade grinding tool 10 makes the substantially semicircular recess 32 a substantially fan-shaped recess 32. It is processed in the same way.

  Next, the cemented carbide tool 30 and the diamond sintered plate material 35 are removed from the work jig of the machining center. And the operation | work which embed | buries each diamond sintered board 35 in the substantially circular recessed parts 32 and 32 of substantially sector shape is performed. Specifically, a molten iron is attached to the cemented carbide plate 35B of the diamond sintered plate material 35, and the cemented carbide plate 35B is directed to the bottom surface 32C of the recess 32 as shown in FIG. Then, as shown in FIG. 11, the side surface 35 </ b> S of the diamond sintered plate material 35 is pressed against the step surface 32 </ b> B of the recess 32.

  Here, the stepped surface 32B of the recess 32 ground by the carbide blade grinding tool 10 of the present embodiment is inclined to the side covering the bottom surface 32C corresponding to the outer peripheral surface 14B of the grindstone portion 14. Thereby, the diamond sintered plate material 35 is separated so as not to ride on the corner portion 32D between the bottom surface 32C and the stepped surface 32B of the concave portion 32, and the side surface 35S of the diamond sintered plate material 35 is separated from each of the concave portions 32, 32. When pressed against the stepped surface 32B, the side surfaces 35S and the edge portions of the stepped surface 32B on the side away from the bottom surface 32C (35E and 32E in FIG. 11) abut securely. That is, the positioning accuracy of the diamond sintered plate material 35 with respect to the carbide blade 31 is improved. Further, since the gradient of the outer peripheral surface 14B of the grindstone 14 is 3 to 4 degrees, the gap between the non-contact portion between the step surface 32B of the recess 32 and the side surface 35S of the diamond sintered plate material 35 is narrowed. And the gap is filled with cocoons.

  Thus, according to the manufacturing method of the cemented carbide grinding tool 10 and the cemented carbide tool 30 of the present embodiment, the grinding time is longer than that of a conventional cemented carbide grinding tool that does not include the groove portion 15 even in a normal machining center. Can be shortened. In addition, it is possible to improve the processing accuracy by efficiently removing grinding scraps, and it is possible to improve the positioning accuracy of the diamond sintered plate material 35 relative to the carbide blade 31. And it becomes possible to reduce a manufacturing cost by the reduction of the NG product based on improvement of these processing precision and positioning precision, and shortening of the grinding time.

In place of the cemented carbide tool 30 as the workpiece shown in FIG. 8, the cemented carbide tool 30X shown in FIG. 12 can also be manufactured using the above-described machining center. The cemented carbide tool 30X has the same diameter, extends in the axial direction, and has a tip portion that is tapered. And the recessed parts 32 and 32 formed in the predetermined carbide blade 31 in this carbide tool 30X are substantially fan-shaped and substantially semicircular, but the curvature radius of these substantially fan-shaped and substantially semicircular becomes the same. ing. In this case, both the substantially semicircular and substantially fan-shaped concave portions 32 and 32 can be machined in the carbide tool 30X without changing the tool by using only one type of carbide blade grinding tool 10.
[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) Although the plurality of groove portions 15 are formed in the carbide blade grinding tool 10 of the above-described embodiment, the number of the groove portions 15 may be one.

  (2) In the above embodiment, the description has been given of the case where the carbide tool 30 is attached to the machining center and the carbide tool 30 is ground. However, the carbide tool 30 is attached to the grinder by attaching the carbide tool 30. You may grind.

  (3) In the said embodiment, in order to grind the recessed parts 32 and 32 from which a curvature radius differs in the carbide tool 30 shown by FIG. 8, two types of carbide blade grinding tools 10 from which a grindstone diameter differs are used. However, by making the carbide blade grinding tool 10 perform arc grinding (that is, grinding in which the carbide blade grinding tool 10 moves in an arc shape in a direction perpendicular to the rotation axis), one kind of carbide blade grinding is performed. You may grind the recessed parts 32 and 32 from which a curvature radius differs with the tool 10. FIG. Moreover, you may process the recessed part of the same curvature in the cemented carbide tool 30X shown by FIG. 12 by circular grinding.

1 is a partial sectional side view of a cemented carbide blade grinding tool according to an embodiment of the present invention. Side sectional view of the tip of a cemented carbide grinding tool Perspective view of the tip of a carbide blade grinding tool Perspective view of grinding wheel part and cone-shaped grinding wheel of carbide blade grinding tool Bottom view of the grinding wheel as seen from the axial direction of the carbide cutting tool Cross-sectional view of the outer edge of the tip of the grinding wheel of a carbide blade grinding tool Cross-sectional view of the outer edge of the tip of the grinding wheel of a carbide blade grinding tool Carbide tool side view Side view of a cemented carbide grinding tool facing the cemented carbide blade of a cemented carbide tool Cross section of carbide tool Cross-sectional view of diamond blades embedded in the recesses of the carbide blade Carbide tool side view Side view of a conventional grinding tool Side view of a conventional grinding tool Cross-sectional view of a recess when a cemented carbide blade is ground with a conventional grinding tool

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Carbide blade grinding tool 11 Mounting shaft part 14 Grinding wheel part 14B Outer peripheral surface 14C Front end surface 14S Conical metal part 15 Groove part 15A 1st inner surface 15B 2nd inner surface 15C Inner ridgeline 15D Ridge line 16 Diamond powder 30 Carbide tool 31 Carbide blade 31H Flat surface 32I, 32 Recess 32B Stepped surface 32C Bottom surface 32D Bottom side corner 35 Diamond sintered plate 35A Sintered plate body 35B Cemented carbide plate

Claims (4)

This is for grinding a recess for embedding a diamond sintered plate material on a part of a carbide blade. Electrodeposition of diamond powder particles on the tip of a mounting shaft that can be mounted on the rotary drive shaft of a machine tool In the carbide blade grinding tool having the grindstone part made,
The grindstone portion has a truncated cone shape whose diameter increases toward the tip and the outer peripheral surface is inclined at a gradient of 3 to 4 degrees with respect to the axial direction, and the tip surface of the grindstone portion is centered from the outer periphery. Concave shape gradually recessed as you go,
In the grindstone part, a groove part opened to the outer peripheral surface and the tip surface is formed,
The groove portion includes a first inner surface substantially parallel to the axial direction of the grindstone portion, a second inner surface inclined with respect to the axial direction of the grindstone portion, and the first and second inner surfaces intersecting each other. An inner ridge line, one end of the inner ridge line is located at the opening edge of the center hole formed in the tip surface of the grindstone part,
The second inner surface is disposed on the rear side of the first inner surface in the rotation direction of the groove,
A cemented carbide grinding tool, wherein a ridge line between the second inner surface and the outer peripheral surface of the grindstone portion is inclined by 60 ± 10 degrees with respect to the axial direction of the grindstone portion.   The chamfering process of 0.02-0.08 mm was given to the front-end | tip outer edge part of the cone-shaped metal part which is the electrodeposition object of the diamond particle of the said grindstone part. Carbide blade grinding tool. In the method of manufacturing a cemented carbide tool, a part of the cemented carbide blade is ground to form a recessed part depressed in a stepped shape, and a diamond sintered plate material is embedded in the recessed part to make a part of the cemented carbide blade.
  The carbide blade grinding tool according to claim 1 or 2 is used to grind the concave portion into the carbide blade, and the stepped surface of the concave portion is provided with an outer peripheral surface of the grindstone portion in the carbide blade grinding tool. Manufacturing a cemented carbide tool characterized in that, by pressing, the stepped surface of the concave portion is inclined to the side covering the bottom surface of the concave portion, and the side surface of the diamond sintered plate material is butted against the stepped surface. Method. A cemented carbide plate is laminated and sintered on the back surface of the sintered plate material main body made only of the diamond sintered material,
  A step of measuring the depth of the concave portion after grinding the concave portion, and a step of surface grinding the cemented carbide plate so that the thickness of the entire diamond sintered plate material corresponds to the depth of the concave portion, and The method for manufacturing a cemented carbide tool according to claim 3, wherein the step of brazing the cemented carbide alloy plate in the diamond sintered plate material to the bottom surface of the recess is performed.

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