JP2008194775A - Manufacturing method of throw-away drill holder, throw-away drill holder and throw-away drill with the same, and cutting method with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a throw-away drill holder with high working efficiency and energy efficiency by efficiently forming a spiral blind hole which is a step in the middle of forming a coolant hole. <P>SOLUTION: This is the manufacturing method of the throw-away drill holder with the coolant hole passed from the front end to the rear end. It comprises a step of preparing a material for a main body section with a through-hole partially formed of a spiral hole, a step of preparing a solid material for a cutting section, a step of obtaining a material for the drill holder by friction pressure bonding of the material for the cutting section to the front end of the material for the main body section, a step of obtaining a blank for the drill holder by lathe machining of the outer shape of the material for the drill holder, a step of forming at least one chip discharging groove in the main body section of the blank for the drill holder, and a step of completing the coolant hole by forming at least one insert attachment seat in the cutting section of the blank for the drill holder and forming a linear hole communicated with the through-hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a throw-away drill that is used with a cutting insert detachably attached thereto.

  As a drill for drilling, a solid type drill in which a cutting blade is integrally formed on a drill body and a cutting blade (cutting insert) are detachably attached to the drill body (drill holder). There is a throwaway type drill.

Conventionally, in both of these types of drills, in order to improve chip discharging performance, a drill hole having a coolant hole is often used. In general, drills do not adversely affect rigidity in order to improve chip discharge performance.
It is advantageous to make the chip discharge groove large and spiral. Therefore, in the drill in which the coolant hole is formed, a part of the coolant hole is formed in a spiral shape in accordance with the shape of the chip discharge groove to improve the chip discharge property.

  Among the drill manufacturing methods in which a part of the coolant hole is formed in a spiral shape, as a solid type drill manufacturing method, when extruding the drill body, the coolant is parallel to the rolling material in the axial direction. There is known a method of manufacturing a drill having spiral coolant holes by forming holes in communication and then performing hot twisting.

  On the other hand, the method for manufacturing the throw-away type drill requires a separate step of forming the insert mounting seat portion as compared with the method for manufacturing the solid-type drill. In this process, when the spiral coolant hole extending from the front end to the rear end of the holder is formed first, the insert mounting seat must be formed so as to avoid the spiral coolant hole, which is very difficult.

  Therefore, as a manufacturing method of the throw-away type drill, in the step of forming the coolant hole, first, a helical blind hole is formed so that the holder front end portion (cutting portion) for forming the insert mounting seat portion remains solid. Form. After that, an insert mounting seat is formed at a position suitable for the blind hole, and finally, a coolant hole portion located near the insert mounting seat is provided in a straight line so as to communicate with the blind hole from the front end of the holder. A method of forming a coolant hole has been taken.

  For example, Patent Document 1 discloses a manufacturing method of a throw-away type drill having a spiral coolant hole. In the manufacturing method of Patent Document 1, first, a parallel hole is formed in a cylindrical material other than a cutting part where an insert mounting seat part is formed, and a part of the parallel hole is heated and twisted to form a spiral shape. Process to form a helical blind hole. Then, the insert mounting seat portion is formed with reference to the remaining portion of the parallel hole, and thereafter, a portion of the coolant hole located at the cutting portion is formed so as to communicate with the blind hole.

According to such a manufacturing method, most of the coolant holes are arranged at positions where the deterioration of the drill strength and rigidity is minimized, and the portion close to the cutting edge can obtain the optimum cooling and circulation effect. It is supposed to be possible.
JP-T-08-504370

  However, in the method for manufacturing a drill described in Patent Document 1, a stage in the middle of forming a coolant hole, which is indispensable when a separate insert mounting seat is formed before forming a portion of the coolant hole located at the cutting portion. In order to form a “spiral blind hole”, a part of a straight parallel hole formed as a blind hole is heated and twisted for each solid cylindrical material, and a part is spiral It is processed into a “spiral blind hole”. Therefore, when manufacturing one holder, a process of heating and twisting is required every time. Therefore, it takes time to replace the material, and the heating cycle must be repeated, resulting in a large energy loss. Therefore, there is a problem that the working efficiency is poor and the manufacturing cost of the holder is increased.

  The present invention has been made in order to solve the above-described problems of the prior art, and is a method for manufacturing a throw-away drill holder including a coolant hole penetrating from the front end to the rear end. It is an object of the present invention to provide a method for manufacturing a throw-away drill holder that efficiently forms a “spiral blind hole”, which is a stage in the middle of forming, and has high work efficiency and energy efficiency.

  In order to solve the above-mentioned problem, a method for manufacturing a throwaway drill holder according to the present invention is a method for manufacturing a throwaway drill holder comprising a coolant hole penetrating from the front end to the rear end, from the front end to the rear end. A step of preparing a body part material having a through hole which is at least partially formed of a spiral hole, a step of preparing a solid cutting part material, and a front end of the body part material A process of obtaining a material for a drill holder by friction welding the material for a cutting part, a step of lathing the outer shape of the material for a drill holder to obtain a blank for a drill holder, and a main body portion of the drill holder blank, A step of forming one chip discharge groove, a step of forming at least one insert mounting seat in a cutting portion of the drill holder blank, and the drill The cutting portion of the holder blank, to form a straight hole communicating with the through hole, characterized in that it comprises the steps of completing the coolant hole.

  With such a configuration, it penetrates from the front end to the rear end, and at least a part of the body part material having a through hole made of a spiral hole, and the solid cutting part material are friction welded, Since the “spiral blind hole”, which is a stage in the middle of forming the coolant hole, can be easily formed, work efficiency can be improved.

  In addition, in the step of forming the chip discharge groove, further comprising a step of forming a main body portion reference surface based on the position of the spiral hole on at least a part of the outer peripheral surface of the main body portion material, In the step of forming the chip discharge groove and forming the insert mounting seat portion with the main body portion reference surface as a reference, the insert mounting seat portion is formed with respect to the main body portion reference surface as a reference. The waste discharging groove and the insert mounting seat can be easily formed at an appropriate position with respect to the position of the spiral hole.

  Further, in the step of preparing the main body part material, the main body part material is located on the rear side of the spiral part material formed by penetrating the spiral hole, and externally. A material for a solid shank portion to be mounted on a machine tool of the above, and friction welding the solid shank portion material to the rear end of the spiral portion material formed through the spiral hole, The material for the shank part is perforated so as to communicate with the spiral hole to form the through hole to obtain the material for the main body part, so that different properties suitable for the characteristics required for the spiral part and the shank part are obtained. A main-body part can be formed using a grade.

  Further, in the step of forming the body portion reference surface, as the body portion reference surface, at least a spiral portion reference surface formed on the spiral portion material, and a shank portion reference surface formed on the shank portion material. And forming the through-hole in the step of preparing the body portion material, the spiral portion is formed on the shank portion material with reference to at least one of the spiral portion reference surface and the shank portion reference surface. By drilling so as to communicate with the cylindrical hole and forming the through hole, a position reference is provided at a position closer to the portion of the coolant hole located at the shank portion, so that the hole is drilled at an appropriate position with respect to the spiral hole. Thus, the through hole can be processed more easily.

  Furthermore, in the step of forming the chip discharge groove, the chip discharge groove is formed on the basis of the shank portion reference surface, and the insert mounting seat portion is formed on the basis of the shank portion reference surface. By forming the insert mounting seat, the lathe machining of the drill holder material performed before forming the chip discharge groove and the insert seating portion in the drill holder blank, the surface serving as the position reference is not lost. The chip discharge groove and the insert mounting seat can be formed at appropriate positions with respect to the spiral hole.

  In addition, since the material for the cutting portion and the material for the main body portion are made of different materials, a material that can easily process the insert mounting seat portion is formed in the cutting portion, and a material that has excellent wear resistance is provided in the main body portion. Can be selected, and the required performance can be exhibited at each location of the drill holder body.

  Furthermore, the hardness of the material for the cutting part is lower than the hardness of the material for the main body part, so that a softer cutting part can easily form an insert mounting seat when processing the drill holder itself, The part is resistant to friction with the generated chips during the cutting process using the drill holder, and can suppress the wear of the holder during the cutting process.

  The throw-away type drill holder of the present invention has a cutting portion in which an insert mounting seat portion on which a cutting insert is mounted at the front end is formed, a rear end of the cutting portion that is located on the rear side, and an external machine tool. A main body portion that is mounted and at least partially formed with a chip discharge groove, at least a portion located in the main body portion is a spiral hole, and a portion located in the cutting portion is a linear hole A throw-away drill holder comprising a coolant hole penetrating from the front end of the cutting portion to the rear end of the main body portion, the first being between the cutting portion and the main body portion. It has a friction welding part, The connection part of the spiral hole of the said coolant hole and a linear hole is located in this 1st friction welding part, It is characterized by the above-mentioned.

  With such a configuration, the drill holder has the first friction welding portion, and the intersection position between the spiral hole and the straight hole of the coolant hole where the strength of the holder tends to decrease is the friction welding portion with high material strength. Therefore, the holder can be prevented from being damaged by suppressing a decrease in strength of the holder.

  Further, the main body portion includes a spiral portion formed through the spiral hole, and a shank portion located on the rear side of the spiral portion and attached to an external machine tool, and The second friction welding portion between the spiral portion and the shank portion, and the second friction welding portion includes a portion of the spiral hole and the coolant hole located at the shank portion; Since the connecting portion of each hole can be formed of a high-strength material, the strength of the drill holder is ensured, and the shank portion and the cutting are secured. The coolant hole located in the portion can be formed in a shape suitable for each.

  With such a configuration, the drill holder has the first friction welding portion, and the intersecting position of the spiral hole and the straight hole of the coolant hole where the toughness of the holder is likely to be lowered is a high strength friction welding portion. Since it arrange | positions, the fall of the toughness of a holder can be suppressed and it can prevent that a holder is damaged.

  Further, the main body portion includes a spiral portion formed through the spiral hole, and a shank portion located on the rear side of the spiral portion and attached to an external machine tool, and The second friction welding portion between the spiral portion and the shank portion, and the second friction welding portion includes a portion of the spiral hole and the coolant hole located at the shank portion; The position of the connecting part of the drill holder can increase the strength at the connecting part of each hole where the toughness of the drill holder is likely to decrease. The coolant holes located can be formed in a shape suitable for each.

  Moreover, the part located in the said shank part among the said coolant holes is a linear hole, Therefore The process of a coolant hole becomes easy.

  Furthermore, the diameter of the portion of the coolant hole located in the shank portion is larger than the diameter of the spiral hole, so that the coolant hole can be further easily processed and the processing efficiency can be further improved.

  In addition, since the cutting part and the main body part are made of different materials, the cutting part and the main body part can be configured with optimum materials according to the respective purposes.

  Furthermore, since the hardness of the cutting portion is lower than the hardness of the main body portion, the insert mounting portion is processed into the drill holder even when the main body portion is made of a high-hardness material to improve wear resistance. It becomes easy.

  Moreover, the throw-away type drill of the present invention includes the throw-away type drill holder and a cutting insert mounted on the insert mounting seat.

  With such a configuration, since it has a drill holder with a low manufacturing cost in which a chip discharge groove and an insert mounting seat are formed at an appropriate position with respect to the spiral hole, the manufacturing cost is low and the cutting is performed. A drill with excellent performance can be obtained.

  The cutting method of the present invention is a cutting method for cutting a work material using the throw-away drill, wherein the work material is rotated by rotating at least one of the throw-away drill and the work material. A step of bringing the throw-away drill close to a material, a cutting step in which a cutting blade formed on the cutting insert is brought into contact with the surface of the work material, and the work material is cut; and And a step of retracting the throw-away drill.

  With such a configuration, since cutting is performed using a drill having excellent cutting performance, cutting with high processing accuracy can be realized at low cost.

  According to the manufacturing method of the throw-away type drill holder of the present invention, the coolant is formed by friction-welding the main body part material having a through hole partly formed of a spiral hole and the solid cutting part material. Easily form a “spiral blind hole”, which is a step in the middle of forming the coolant hole, which is essential when forming the insert mounting seat separately before forming the portion located in the cutting part of the hole Therefore, the manufacturing cost of the drill can be reduced and the working efficiency can be improved.

  Furthermore, according to the throw-away type drill holder of the present invention, the first friction welding portion is provided between the main body portion and the cutting portion, and the spiral hole and the straight hole of the coolant hole are provided in the first friction welding portion. Since the connecting portion with the coolant hole is located at the friction welded portion where the material strength is high, the holder is reduced in strength. It is possible to prevent the holder from being damaged.

  Furthermore, in the cutting method of the present invention, the cutting performance of the throw-away drill is excellent, and the manufacturing cost of the drill can be kept low, so that stable cutting can be performed at low cost for a long time. Such excellent effects can be obtained.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 shows an embodiment of the present invention and is an overall perspective view of a throw-away type drill holder (hereinafter abbreviated as a drill holder) 1 according to a first embodiment of the present invention. 2 is an overall perspective view of a throw-away drill (hereinafter abbreviated as a drill) 3 in which a cutting insert (hereinafter abbreviated as an insert) 2 is mounted on the drill holder 1 of FIG. FIG. 3 is an overall perspective view of the drill holder 1 ′ according to the second embodiment.

  FIG. 4 is a process schematic diagram illustrating the method for manufacturing the drill holder 1 according to the first embodiment of the present invention, and FIG. 5 is a method for manufacturing the drill holder 1 ′ according to the second embodiment of the present invention. FIG.

<Drill holder and drill>
First, the drill holder and drill by embodiment based on this invention are demonstrated using FIG. 1 thru | or FIG.

  As shown in FIG. 1, the drill holder 1 according to the first embodiment of the present invention is formed by penetrating from a cutting part 4, a main body part 5, and a front end of the cutting part 4 to a rear end of the main body part 5. The coolant hole 6 and the first friction welding part 7 located between the cutting part 4 and the main body part 5 are provided.

  The cutting portion 4 is a front portion of the drill 1 and is formed with an insert mounting seat portion 8 on which the insert 2 is mounted at the front end. The main body portion 5 is located on the rear side of the cutting portion 4 and has a chip discharge groove 9 formed at least in part. The rear end of the main body 5 is attached to an external machine tool when the drill 1 is used for cutting. As shown in FIG. 1, the coolant hole 6 has at least a part located in the main body part 5 as a spiral hole 61 and a part located in the cutting part 4 as a straight hole 64. From the front end to the rear end of the main body 5.

  In addition, the drill holder 1 of this embodiment illustrates the form formed so that the part located in a main-body part among the coolant holes 6 may become the helical hole 61 over the full length. That is, the coolant hole 6 of this embodiment has a spiral hole 65 (61) and a linear hole 64.

  And the drill holder 1 which concerns on this invention has the 1st friction welding part 7 between the cutting part 4 and the main-body part 5, and the spiral shape of the coolant hole 6 in this 1st friction welding part 7 is provided. The connection part of the hole 61 and the linear hole 64 is located, It is characterized by the above-mentioned. In the drill holder 1 having such a configuration, the intersecting position of the spiral hole 61 and the linear hole 64 of the coolant hole 6 in which the strength of the holder is likely to be lowered is arranged in the friction welding portion having high strength. Therefore, it is possible to prevent the holder from being damaged by suppressing a decrease in the strength of the holder.

  Further, the coolant hole 6 is configured such that the shape of the coolant hole 6 is different with the first friction welding portion 7 as a boundary. Specifically, the portion of the coolant hole 6 located in the main body portion 5 is composed of the spiral hole 61 over the entire length as described above. A portion of the coolant hole 6 positioned at the cutting portion 4 is formed by a straight hole 64. Since the coolant hole 6 has such a shape, the chip discharge groove 9 can be formed deeper along the spiral hole 61 and the coolant discharged from the straight hole 64 is inserted. It can discharge stably to an appropriate position with respect to the two cutting edges. As a result, the chip discharge performance is improved and the cutting edge temperature can be effectively reduced.

  Here, the friction welding part is a part where two materials are joined by the friction welding method. Specifically, it is a portion where the cutting part and the main body part are joined. Therefore, it is a part which has a different material structure | tissue with respect to each material structure | tissue which comprises a cutting part and a main-body part. For example, it is a part where both materials are mixed by plastic flow with each interface region between the cutting part and the main body part as a boundary, and the structure of the material to be configured is different from the cutting part and the main body part. That is. In the friction welded portion, almost no occurrence of a cast structure, coarse crystal grains, pinholes, etc. as seen in the fusion spot joining is observed. And there exists the characteristic that intensity | strength improves rather than the other raw material located in the both ends of a friction welding part. Therefore, the strength can be locally increased by using the friction welding portion.

  Moreover, in the drill holder 1 according to the present embodiment, as the above-described insert mounting seat portion 8, the inner blade insert mounting seat portion 81 formed in the vicinity of the holder axis and the holder outer peripheral surface are formed. Two insert mounting seats 8 are formed, the outer blade insert mounting seat 82. That is, in the drill holder 1, the inner blade insert mounting seat 81 and the outer blade insert mounting seat 82 are formed asymmetrically with respect to the holder axis. Thereby, the insert for inner blades and the insert for outer blades mounted on each insert mounting seat portion complementarily contribute to the cutting process, and the cutting resistance applied to one insert can be reduced.

  Furthermore, in the drill holder 1 according to the present embodiment, the inner blade insert mounting seat 81 and the shank portion reference surface 102 are formed in parallel. Thereby, the shank part reference surface 102 can be easily processed into the shank part 52. In addition, even if the parallel here includes an error of about ± 5 °, the same effect can be obtained.

  The drill holder 1 shown in FIG. 1 is used for drilling as the drill 3 shown in FIG. 2 by attaching the insert 2 to the insert mounting seat portion 8 formed in the cutting portion 4 using a clamp member such as a screw.

  FIG. 2 shows a drill 3 according to a first embodiment of the present invention. The drill 3 is formed by mounting the inserts 2 and 2 on two insert mounting seats 81 and 82 formed on the drill holder 1, respectively. In this embodiment, one screw 12 is screwed into a screw hole 11 formed in the holder 1, and each insert 2 is screwed to each insert mounting seat portion 8 of the holder 1. At this time, the insert 2 is mounted on the drill holder 1 so that the cutting edge of the insert 2 protrudes from the front end surface of the drill holder 1. The means for mounting the insert 2 to the insert mounting seat 8 is not limited to the illustrated screw stop, but may be another clamping mechanism.

  Next, the drill holder 1 'according to the second embodiment will be described with reference to FIG. In addition, about the structure substantially the same as the drill holder 1 by 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the drill holder 1 ′ according to the second embodiment of the present invention, the main body portion 5 is located on the rear side of the spiral portion 51 and the spiral portion 51 formed through the spiral hole 61. And a shank portion 52 to be mounted on the machine tool, and a second friction welding portion is provided between the spiral portion 51 and the shank portion 52. And the connection part of the part located in the shank part 52 among the helical hole 61 and the coolant hole 6 is located in the 2nd friction-welding part 7 (72), It is characterized by the above-mentioned.

  With this configuration, the strength of the connecting portion of each hole where the strength of the drill holder is likely to be reduced can be increased, so that the coolant hole located in the shank portion and the cutting portion can be formed in a shape suitable for each. . And since it can suppress that the intensity | strength of a holder falls, it can prevent that a drill holder is damaged.

  With such a configuration, the strength at the connecting portion of each hole where the toughness of the drill holder is likely to be reduced can be increased, so that the coolant hole located in the shank portion and the cutting portion can be formed in a shape suitable for each. . And since it can suppress that the toughness of a holder falls, it can prevent that a drill holder breaks.

  Moreover, it is preferable that the part 652 located in the shank part 52 among coolant hole 6 'is a linear hole. This facilitates processing of the portion 652 located in the shank portion 52 of the coolant hole 6 '.

  The diameter of the portion 652 located in the shank portion of the coolant hole 6 is preferably formed larger than the diameter of the spiral hole 651. Thereby, when processing the part 652 located in a shank part among the coolant holes 6 with a drill, it can process using a drill with a large diameter, Therefore The damage of the drill used for a process can be suppressed. Therefore, the working efficiency of processing of the portion 652 located in the shank portion of the coolant hole 6 can be improved. Furthermore, since the positioning of the portion 652 located in the shank portion of the coolant hole 6 with respect to the spiral hole 651 can be made rougher, the intersection of the hole positions can be widened.

  Furthermore, it is preferable that the cutting part 4 and the main body part 5 are made of different materials. In particular, it is preferable to use a material whose hardness is lower than that of the main body portion 5 for the cutting portion 4. Thereby, since the cutting part 4 is comprised with a softer material, when manufacturing a drill holder, it is easy to process the insert mounting seat part 8 by machining in the cutting part 4, and working efficiency improves. Furthermore, since the main-body part 5 is comprised with a harder material, the abrasion by the chip | tip of a drill-holder main body can be suppressed in the cutting process using a drill holder.

  Carbon steel, alloy steel, tool steel, or the like can be used as a material for forming the cutting portion 4. Moreover, as a material which forms the main-body part 5, carbon steel, alloy steel, tool steel, etc. can be used. In particular, the cutting part 4 is preferably made of alloy steel, and the main body part 5 is preferably made of tool steel in terms of improving the toughness and chip dischargeability of the drill holder and the wear of the holder.

  In addition, the hardness of the material of each part can measure Brinell hardness (JIS Z 2243: 1992), Vickers hardness (JIS Z 2244: 1998), etc. suitably, and obtain | require the magnitude correlation of the hardness of the material of each part. it can. In addition, the measurement of the hardness in this case can be performed in accordance with the corresponding JIS regulations.

<Drill holder manufacturing method>
A drill holder manufacturing method according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5.

  The manufacturing method of the drill holder 1 by 1st embodiment which concerns on this invention is demonstrated using FIG. The manufacturing method of the drill holder 1 by 1st embodiment has the following processes.

  In addition, the drill holder 1 obtained by the manufacturing method according to the present embodiment includes a cutting portion 4 in which an insert mounting seat portion 8 to which the insert 2 is mounted is formed at the front end, as shown in FIG. The main body part 5 is located on the rear side of the cutting part 4 and the rear end is mounted on an external machine tool and the chip discharge groove 9 is formed at least in part, and at least one of the main body part 5 And a coolant hole 6 formed so as to penetrate from the front end of the cutting part 4 to the rear end of the main body part 5 so that the part becomes a spiral hole 61.

  The manufacturing method of the drill holder 1 according to the first embodiment is a step of first preparing the body portion material 5B that penetrates from the front end to the rear end and has a through hole 65 at least partly formed of the spiral hole 61. (A, b) and a step of preparing a solid cutting part material 4B. In FIG. 4, as a step (a, b) of preparing the body portion material 5B, a long material having a spiral hole formed therethrough, for example, a substantially columnar material, is appropriately sized. The case where it cut | disconnects to 5 and obtains the raw material 5B for body parts is illustrated. Since the method shown in FIG. 4 can use a material through which a long spiral hole penetrates, the process of heating and twisting the drill holder material every time when manufacturing one holder. It is not necessary, and work efficiency and energy efficiency can be improved. The step of preparing the main body portion material 5B is not limited to this, and it is only necessary to prepare a material in which at least a part of the hole made of the spiral hole 61 is formed according to the dimensions of the main body portion 5. The body portion material 5B can be prepared also by other methods.

  Next, the step (d) of obtaining the drill holder material 1B by friction-welding the cutting part material 4B to the front end of the prepared main body material 5B is performed. Specifically, using a dedicated machine for friction welding, either the main body material 5B or the cutting material 4B is rotated at a high speed, and one end is pressure-bonded to the other end surface to be integrated. By doing so, it is possible to obtain the drill holder material 1B in which the cutting part material is located on the front side and the main body part material is located on the rear side.

  Friction welding is one of the techniques for joining two cylindrical metal materials. Specifically, two cylindrical metal materials are rotated relative to each other around the axis, and the frictional heat is generated on the joint surface by butting them together, the base material is softened, the rotation is stopped after reaching a certain temperature, This is a technique for firmly joining two metal materials by applying thrust in the axial direction. Thus, the joint obtained by the friction welding method, i.e., the friction welding part, as described above, there is no occurrence of cast structure, coarse crystal grains, pinholes, blowholes, etc., as seen in the melting point joining, A more ideal coupled state can be formed. As a result, the strength is improved as compared with the base material located at both ends of the friction welding portion.

  And the process (e) which carries out the lathe process of the external shape of the drill holder raw material 1B obtained by the said process, and obtains the drill holder blank 1b is performed. That is, the drill holder material 1B is suitable for each part of the final drill holder 1 by using a lathe or the like on the outer periphery of the drill holder material 1B before forming the insert mounting seat 8 and the chip discharge groove 9. The drill holder blank 1b is processed into an outer diameter.

  Further, the step of forming the chip discharge groove 9 in the main body portion of the drill holder blank 1b, the step of forming the insert mounting seat portion 8 in the cutting portion of the drill holder blank 1b, and the drill holder blank The drill holder 1 is obtained by forming a linear hole 64 communicating with the through hole 65 in the cut portion 1b and completing the coolant hole 6 (f). Specifically, the chip discharge groove 9 and the insert mounting seat 8 can be formed by machining using an appropriate cutting tool such as a ball end mill. Thereafter, the cutting tool suitable for drilling such as a drill is used to communicate with the through hole 65 having the spiral hole 61 at an appropriate position with respect to the formed chip discharge groove 9 and the insert mounting seat 8. A straight hole 64 is formed to complete the coolant hole 6. Thereby, the drill holder 1 shown in FIG.4 (f) can be obtained.

  Since the manufacturing method according to the present invention includes such steps, the main body portion material 5B having a through hole 65 partially including a spiral hole 61 and the solid cutting portion material 4B. Can be formed by forming a “Helical blind hole”. Therefore, each time a single holder is manufactured, one solid material is heated and twisted each time. Since a process of forming a “spiral blind hole” is not required, the working efficiency can be improved and the manufacturing cost can be reduced. Furthermore, since the spiral hole 61 having a uniform lead from the tip to the rear end can be held as it is, the tip of the spiral hole 61 and the spiral hole 61 are formed as in the case where the spiral hole is heated and twisted. It is not necessary to remove the non-uniform portion due to non-uniform leads at the rear end. Therefore, the material on the front end side and the rear end side of the material is not lost. Therefore, the manufacturing method concerning this invention can manufacture the drill holder 1 provided with the helical hole 61 with a uniform lead efficiently at low cost.

  The drill holder manufacturing method according to the present invention further includes a step (c) of forming the main body reference surface 10 based on the position of the spiral hole 61 on at least a part of the outer peripheral surface of the main body material 5B. ), And in the step of forming the chip discharge groove 9, in the step of forming the chip discharge groove 9 and forming the insert mounting seat portion 8 on the basis of the main body portion reference surface 10, The insert mounting seat 8 is preferably formed with reference to 10. In the drill holder manufacturing method according to the present embodiment, the rear end opening of the through-hole 65 exists at the rear end (left end in FIG. 4) of the main body 5. The rear end opening of the through-hole 65 opens to the rear end surface of the main body 5 and can be visually observed. Since the entire length of the through hole 65 according to the present embodiment is the spiral hole 61, the insert mounting seat 8 and the chip discharge groove 9 can be formed on the basis of the position of the rear end opening of the through hole 652. . However, by separately providing the main body portion 5 with the main body portion reference surface 10 which serves as a position reference for the spiral hole 61, the position reference is closer to the portion where the insert mounting seat portion 8 and the chip discharge groove 9 are formed. As a result, the insert mounting seat 8 and the chip discharge groove 9 can be more easily processed at appropriate positions with respect to the spiral hole 61, and the working efficiency can be further improved.

  In addition, in the process of forming the main body part reference surface 10, at least one surface of the main body part reference surface 10 is formed so as to be parallel to the insert mounting seat part 8, thereby processing the main body part reference surface 10. Since it becomes easy, it is preferable. Moreover, the obtained drill holder can be made into a shape suitable for a lathe.

  Moreover, in the manufacturing method of this invention, after carrying out the friction welding of the two members mentioned above, it is preferable to perform an annealing process suitably. This makes it possible to soften the hardened structure formed in the interface region between the two members due to friction welding. As a result, machining of the insert mounting seat 8 and the chip discharge groove 9 which is a subsequent process of the process of friction welding the respective materials is facilitated, and the working efficiency can be further improved. Moreover, the toughness of the drill holder main body can be improved, and the holder life can be improved. And the part 64 located in the cutting part 4 among the coolant holes 6 can also be processed easily.

  Furthermore, it is preferable to use different materials for the cutting portion material 4B and the main body portion material 5B. In particular, it is preferable to use a material whose hardness is lower than that of the body portion material 5B for the cutting portion material 4B. Thereby, processing of the drill holder itself performed when manufacturing the drill holder 1 (the step of forming the insert mounting seat portion 8 and the chip discharge groove 9 and the portion 64 of the coolant hole 6 positioned at the cutting portion 4) is easy. In addition, in the cutting process using the drill holder 1, excellent wear resistance can be exhibited.

  At this time, the material of the cutting portion material 52 is preferably alloy steel in that the processing of the insert mounting seat portion 8 in the subsequent process is easy, and the material of the main body portion material 51 is the drill itself. Tool steel is desirable in terms of strength and wear resistance. As a result, the drill itself can be easily processed, work efficiency can be improved, and a drill having high wear resistance and toughness against chips and excellent cutting performance can be manufactured.

  Next, the manufacturing method of the drill holder 1 'according to the second embodiment will be described with reference to FIG. In addition, description is abbreviate | omitted about the process same as the manufacturing method by 1st embodiment mentioned above.

  In the manufacturing method of the drill holder according to the second embodiment, in the step (c) of preparing the main body material 5B of the manufacturing method according to the first embodiment described above, the main body material 5B is provided with a spiral hole 61 ( 651) is formed through the spiral portion material 51B, and the shank portion material 52B that is located on the rear side of the spiral portion material 51B and is mounted on an external machine tool, A solid shank portion material 52B is friction-welded to the rear end of the spiral portion material 51B formed through the spiral hole 61 (651), and the spiral hole 61 ( 651) to form a through-hole 65 so as to communicate with the main body portion material 5B.

  By providing such a process, the main body portion material 5B is formed by friction welding the spiral portion material 51B and the shank portion material 52B. Therefore, as shown in FIG. 5, the spiral hole 651 and the coolant hole are formed. 6, the portion 652 positioned in the shank portion 52 can be a through hole 65 having a different shape. Moreover, the main-body part 5 can be formed using the different material suitable for the characteristic calculated | required by each of the spiral part 51 and the shank part 52, and it can be set as the drill holder excellent in cutting performance.

  In addition, as a concrete shape of the part 652 located in the shank part 52 among the coolant holes 6, it is preferable to consist of a linear hole. Processing is facilitated by forming a straight hole. Furthermore, it is more preferable that the diameter of the linear hole is larger than the diameter of the spiral hole 651. Thereby, since the positioning with respect to the spiral hole 651 of the part 652 located in a shank part among the coolant holes 6 can also be made rougher, the tolerance of a hole position can be widened. As a result, the processing efficiency can be further improved.

  Further, when the main body part material 5B is formed from the spiral part material 51B and the shank part material 52B in this way, when forming the main body part reference surface 10, the main body part reference surface 10 is used at least for the spiral part. Forming the spiral portion reference surface 101 formed on the material 51B and the shank portion reference surface 102 formed on the shank portion material 52B, with reference to at least one of the spiral portion reference surface 101 and the shank portion reference surface 102, It is preferable that the through hole 65 is formed by perforating the shank portion material 52B so as to communicate with the spiral hole 651. Thereby, since the shank part reference surface 102 which becomes the position reference of the spiral hole 61 is formed at a position closer to the shank part 52 which forms the portion 652 located in the shank part of the coolant hole 6, A portion 652 of the coolant hole 6 positioned at the shank portion can be easily processed at an appropriate position with respect to the spiral hole 61.

  Moreover, in the manufacturing method of this embodiment, as shown in FIG. 5, in the step (e) of turning the outer shape of the drill holder blank 1B to obtain the drill holder blank 1b, the position reference of the spiral hole 651 The spiral portion reference surface 651 thus formed is lost by turning. However, by forming the position reference surface based on the spiral reference surface 101 that serves as the position reference of the spiral hole 61 in the shank portion 52, it is formed in the shank portion 52 remaining in the shape of the drill holder blank 1b. The insert mounting seat 8 and the chip discharge groove 9 can be formed using the shank reference surface 102 as a reference (step f). Therefore, the reference surface (102) serving as a position reference can be held until the end, and the insert mounting seat portion 8 and the chip discharge groove 9 can be easily formed at appropriate positions with respect to the spiral hole 651.

  As the main body reference surface 10, a plurality of spiral reference surfaces 101 and shank reference surfaces 102 may be formed. In the present embodiment, as shown in FIG. 5D, the main body reference surface 10 is formed by forming one spiral reference surface 101 and two shank reference surfaces 102. In such a case, for example, the shank portion reference surface 102 is left in the final drill holder shape and can be used as a rotation stop when the drill holder is placed horizontally.

  Further, in the step (d) of forming the main body portion reference surface 10, it is desirable to form the shank portion reference surface 102 so as to be parallel to the insert mounting seat portion 8. As a result, the reference surface can be easily processed.

  Further, in the present embodiment, as in the above-described embodiment, the cutting portion material 4B and the main body portion material 5B use different materials, and the spiral portion material 51B and the shank portion material 52B also differ in material. It is possible to manufacture using. At this time, it is preferable to use a material whose hardness is higher than that of the shank material 5B as the material 51B for the spiral. For example, tool steel can be used as the spiral portion material 51B, and alloy steel can be used as the shank portion material 5B. Thereby, it becomes easy to process the part 652 located in a shank part among the coolant holes 6. FIG.

  In both the first and second embodiments described above, the two spiral holes 61 are exemplified so as to be symmetric with respect to the holder axis. It may be formed so as to be asymmetric with respect to the holder axis, depending on the shape of the seat and the chip discharge groove.

  Next, a cutting method for cutting a work material according to the present invention will be described.

  The cutting method of the work material of this invention is performed using the above-mentioned drill 3. Specifically, at least one of the drill 3 and the work material is rotated, the step of bringing the drill 3 close to the work material, and the cutting blade formed on the insert 2 is brought into contact with the surface of the work material, A cutting process for cutting the work material, and a process for retracting the drill 3 from the work material.

  With such a configuration, the cutting performance of the throw-away type drill is excellent, and the manufacturing cost of the drill can be kept low, so the excellent effect that stable cutting can be performed for a long time at low cost. Obtainable.

  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 is an overall perspective view of a throw-away drill holder according to a first embodiment of the present invention. FIG. 2 is an overall perspective view of a throw-away drill formed by mounting a cutting insert on the throw-away drill holder of FIG. 1. It is a whole perspective view of the throwaway type drill holder by 2nd embodiment which concerns on this invention. It is a schematic explanatory drawing explaining the manufacturing method of the throwaway type drill holder by 1st embodiment of this invention. It is a schematic explanatory drawing explaining the manufacturing method of the throwaway type drill holder by 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throw away type drill holder 2 Cutting insert 3 Throw away type drill 4 Cutting part 5 Main body part 51 Spiral part 52 Shank part 6 Coolant hole 61 Spiral hole 64 Straight hole (the part located in the cutting part 4 among the coolant holes 6) )
65 Through-hole (the part located in the main-body part 5 among the coolant holes 6)
651 Portion of coolant hole 6 located in spiral portion 51 (of body portion 5) 652 Portion of coolant hole 6 located in shank portion 52 (of body portion 5) 7 Friction welding portion 71 First friction welding portion 72 Two friction welds 8 Insert mounting seat 81 Inner blade insert mounting seat 82 Outer blade insert mounting seat 9 Chip discharge groove 10 Main body reference surface 101 Spiral portion reference surface 102 Shank reference surface

Claims (16)

A method of manufacturing a throwaway drill holder comprising a coolant hole penetrating from the front end to the rear end,
A step of penetrating from the front end to the rear end and preparing a body part material having a through hole at least a part of which is a spiral hole; and
Preparing a material for a solid cutting part;
A step of friction welding the cutting part material to the front end of the main body part material to obtain a drill holder material;
Lathe machining the outer shape of the drill holder material to obtain a drill holder blank,
Forming at least one chip discharge groove in the body portion of the drill holder blank; and
Forming at least one insert mounting seat in the cutting portion of the drill holder blank; and
Forming a straight hole communicating with the through hole in a cutting portion of the drill holder blank, and completing the coolant hole; and
A method for manufacturing a throwaway drill holder, comprising: And further comprising a step of forming a main body reference surface on the basis of the position of the spiral hole on at least a part of the outer peripheral surface of the main body material,
In the step of forming the chip discharge groove, the chip discharge groove is formed with reference to the main body reference surface,
The method for manufacturing a throw-away drill holder according to claim 1, wherein, in the step of forming the insert mounting seat, the insert mounting seat is formed with reference to the main body reference plane. In the step of preparing the main body material,
The main body part material is a spiral part material formed through the spiral hole, and a solid shank part located on the rear side of the spiral part material and attached to an external machine tool. As it consists of materials,
A solid shank material is friction-welded to the rear end of the spiral material formed through the spiral hole, and the shank material is further drilled to communicate with the spiral hole. The method for manufacturing a throw-away drill holder according to claim 2, wherein the through hole is formed to obtain the main body material. In the step of forming the main body portion reference surface, as the main body portion reference surface, at least a spiral portion reference surface formed on the spiral portion material and a shank portion reference surface formed on the shank portion material are formed. And
In the step of preparing the body portion material, when the through hole is formed, the shank portion material communicates with the spiral hole with reference to at least one of the spiral portion reference surface and the shank portion reference surface. 4. The method of manufacturing a throw-away drill holder according to claim 3, wherein the through-hole is formed by drilling in such a manner. In the step of forming the chip discharge groove, the chip discharge groove is formed on the basis of the shank portion reference surface,
5. The method for manufacturing a throw-away drill holder according to claim 4, wherein in the step of forming the insert mounting seat, the insert mounting seat is formed with reference to the shank portion reference surface.   The method for manufacturing a throw-away drill holder according to any one of claims 1 to 5, wherein the cutting portion material and the main body portion material are made of different materials.   The method for manufacturing a throw-away drill holder according to any one of claims 1 to 6, wherein the hardness of the cutting part material is lower than the hardness of the main body part material.   A throw-away drill holder obtained by the method for manufacturing a throw-away drill holder according to any one of claims 1 to 7. A cutting portion in which an insert mounting seat portion on which a cutting insert is mounted at the front end is formed;
Located on the rear side of the cutting part, the rear end is mounted on an external machine tool, and a main body part in which a chip discharge groove is formed at least in part,
At least a part located in the main body part is a spiral hole, and a part located in the cutting part is formed to penetrate from the front end of the cutting part to the rear end of the main body part so as to be a straight hole. Coolant holes,
A throw-away type drill holder comprising:
A first friction welding part is provided between the cutting part and the main body part, and a connecting part between the spiral hole and the straight hole of the coolant hole is located in the first friction welding part. A throw-away type drill holder characterized by The main body portion includes a spiral portion formed through the spiral hole, and a shank portion positioned on the rear side of the spiral portion and attached to an external machine tool, and
The second friction welding part has a second friction welding part between the spiral part and the shank part, and the second friction welding part has a part located in the shank part among the spiral hole and the coolant hole. The throw-away drill holder according to claim 9, wherein the connecting portion is located.   The throwaway drill holder according to claim 10, wherein a portion of the coolant hole located in the shank portion is a straight hole.   The throwaway drill holder according to claim 11, wherein a diameter of a portion of the coolant hole located in the shank portion is larger than a diameter of the spiral hole.   The throwaway drill holder according to any one of claims 9 to 12, wherein the cutting portion and the main body portion are made of different materials.   The throwaway drill holder according to any one of claims 9 to 13, wherein the hardness of the cutting portion is lower than the hardness of the main body portion. A throw-away drill holder according to any one of claims 8 to 14,
A throw-away drill comprising: a cutting insert mounted on the insert mounting seat. A cutting method for cutting a work material using the throw-away drill according to claim 15,
Rotating at least one of the throwaway drill or the work material, and bringing the throwaway drill close to the work material;
A step of bringing the cutting edge formed on the cutting insert into contact with the surface of the work material, and cutting the work material;
Retracting the throwaway drill from the work material;
A cutting method comprising:

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