JP3056021U - Tool holder - Google Patents

Abstract

(57) [Problem] To provide a tool holder capable of quickly and reliably supplying mist-formed coolant through a through spindle in a machine tool to a cutting edge portion of a tool tip. SOLUTION: In a tool holder 1 using a through-spindle coolant capable of supplying a mist-converted coolant from a mist supply source through a through-spindle of a machine body to a cutting edge portion of a cutting tool, a mist passage 11 provided in an axis of the tool holder 1 is provided. The section from the rear end to the tool mounting part 5 is formed by the conductive member 10 having a small inner diameter, the section from the rear end to the through hole of the cutting tool A is kept airtight, and the mist-converted coolant supplied by the tool mounting part 5 is supplied. Flow pressure balance adjustment means
Through hole 17a and communication groove 17 'and cutting tool A to be mounted
A split slit 23 (leakage portion) of the collet chuck 20 is provided along the circumference of the shank a from the axis to the tip in the axial direction.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a tool holder adapted to smoothly supply a cutting fluid from a mist supply device to a tool cutting edge in the form of a mist.

[0002]

[Prior art]

 Conventionally, when cutting a workpiece with a machine tool, a sharp tool is used to increase the processing speed, but at the same time, it is necessary to cool the cutting edge of the tool in the cutting part and quickly remove chips. There is. For this purpose, a method is generally used in which a cutting fluid or a pressurized air is used as a coolant, and the coolant is used to cool the cutting edge of the tool and simultaneously discharge chips.

[0003] How to effectively supply such a coolant to the cutting edge portion of the cutting tool affects not only the work performance but also the improvement of the finishing accuracy. Has been made. As one example, a cutting apparatus as disclosed in JP-A-6-134648 is known. In this cutting device, a concave coolant supply groove is formed in the outer periphery of the tool body of the cutting tool in parallel with the axis toward the cutting edge portion of the tool tip, and the rear end of the cutting tool mounted on the tool holder is formed. High-pressure coolant is introduced into the part, and the coolant flows through the coolant supply groove and is ejected so as to directly hit the rake face of the cutting edge at the tip of the tool.

[0004]

[Problems to be solved by the invention]

 In this way, the method of supplying coolant to the cutting edge at high pressure in order to increase the efficiency of cutting with conventional cutting tools and improve productivity can certainly achieve the intended purpose. On the other hand, the consumption of the coolant increases, and even if it is repeatedly collected and used, the processing of a large amount of waste liquid due to the use of a large amount of coolant and the deterioration of the working environment in the cutting factory There is a problem that cannot be avoided. In particular, there is a problem that the treatment of the waste liquid requires a large treatment cost, and it is difficult to reduce the production cost due to an increase in the secondary cost.

[0005] As a measure to cope with such a problem, the working environment is improved and the cost of waste liquid treatment of the coolant is reduced by reducing the amount of coolant consumption instead of the above-described liquid supply type coolant supply method. In order to reduce emissions, attention is being paid to a technology that replaces the wet type with a semi-dry type. As such a semi-dry type coolant, it is necessary to convert the cutting fluid (cooling fluid) into a mist and supply it to the cutting edge of the cutting tool.

However, there is a problem in a means for supplying the mist-formed coolant to the cutting blade portion of the cutting tool. Therefore, the cutting fluid (cooling fluid) is turned into mist by a mist generator, and is squirted from the through spindle of the machine tool through the through hole provided in the axis of the cutting tool through the tool holder and into the cutting edge at the tip of the cutting tool. However, it was not easy to eject the mist of coolant at the same time as the cutting operation was started, and there was a delay in the supply of coolant from the start of cutting, and the jetting was uneven. It has been found that there are still many problems to promptly eliminate cutting effects and chips.

[0007] The present invention has been made to solve such a problem, and the coolant which has been turned into a mist at a cutting edge of a cutting tool through a through spindle in a machine tool can be quickly removed. The purpose of the present invention is to provide a tool holder that can be supplied reliably.

[0008]

[Means for Solving the Problems and Functions / Effects]

 In order to achieve the above-mentioned object, the tool holder according to the present invention provides a through-spindle coolant capable of supplying a mist-converted coolant from a mist supply source to a cutting edge portion of a cutting tool through a through-spindle of an airframe and ejecting the same. In the tool holder used, the inside diameter of the mist passage provided in the shaft center is reduced, and the shank of the tool to be mounted is used as a means for adjusting the flow pressure of the supplied mist coolant in the tool mounting part. A leakage part is provided along the peripheral side from the axis to the tip in the axial direction.

According to the present invention configured as described above, when the tool holder is mounted on the through spindle of the machine tool, the mist supplied from the mist supply source attached to the machine tool through the through spindle is formed. When the coolant flows through the mist passage provided in the tool holder from the mist supply pipe, the inside diameter of the mist passage is reduced, so that the coolant flows in at a high speed by being narrowed at the same time as the inflow, and Not affected by centrifugal force due to rotation. As a result, the mist coolant particles are not separated in the air stream to be conveyed, and there is no space to stay.Therefore, the inside of the tool mounted on the tool mounting part while the gas-liquid mixed state is maintained It is fed into the through-hole, and is ejected to the cutting portion from an ejection port provided at the tip of the tool, so that the effect of cooling and removing chips can be obtained.

In addition, in the initial stage when the mist-formed coolant is supplied to the mist passage in the tool holder, the air staying in the mist passage and in the passage at the tool mounting portion is high speed as described above. When the mist coolant is supplied, a leaking part is provided in the tool mounting part along the circumference of the shank part of the tool to be mounted, leading from the axis to the tip in the axial direction, as a means for adjusting the flow pressure of the coolant. As a result, the accumulated air is exhausted all at once through the leaked portion, and does not hinder the inflow of the supplied mist of coolant.The coolant can be supplied quickly without delaying the start of cutting. This automatically adjusts the supply balance of the coolant to provide a smooth supply to the cutting part.

[0011] The conductive member and the tool mounting portion constituting the mist passage are attached so that the leading end of the conductive member and the rear end of the collet chuck incorporated in the tool mounting portion are air-tightly joined, and the tool by the collet chuck is used. A groove extending across the mist passage is provided at the shank mounting end of the collet chuck and the inner end face of the collet chuck. The mist passage is divided from the rear end of the collet chuck to the through hole of the tool shaft center and from the groove to the collet chuck. It is preferable to configure so as to communicate with the split slit portion.

In this way, when the tool holder is mounted on the through spindle of the machine tool and the supply of the mist coolant is started, the air in the mist passage of the tool holder is supplied at a high speed. The coolant is discharged from the groove extending to the outside through the split slit portion of the collet chuck at the inner end face of the collet chuck communicating to the outside. After that, a part of the mist coolant is discharged to the outside from the split slit to cool the surface of the tool, and the mist coolant continuously supplied is cut while maintaining the balance. Spout to the part can be performed quickly. Needless to say, gas and liquid are not separated in the initial stage of the supply of the mist coolant, and the coolant can be continuously supplied to the cutting portion.

[0013] A groove (communication groove) that traverses the mist passage at the shank mounting end of the tool by the collet chuck and the inner end surface of the collet chuck is provided on the end surface of the tool end adjusting piece of the collet chuck. Is good. Alternatively, a piece having a groove (communication groove) crossing the mist hole may be interposed between the tool end adjusting piece of the collet chuck and the shank end of the tool. In this way, when the cutting tool is mounted in the tool mounting section, the stagnant air discharge section is immediately formed by the supply of the mist coolant in that state, and the subsequent coolant supply balance adjustment Can be easily formed.

[0014] Furthermore, the mist passage has a hollow conductive member having a reduced inner diameter from the rear end to the tool mounting portion fitted around the shaft center, and the front end portion thereof is air-tightly connected to the tool mounting portion. The configuration should be good. In this way, even if the tool holder is long, it is mounted on the tool holder mounting portion of the through spindle and connected to the supply pipe for mist coolant provided in the through spindle. In addition, there is an advantage that a configuration capable of easily and surely maintaining the airtightness up to the tool mounting portion and preventing gas-liquid leakage from occurring to the tip portion can be easily manufactured.

Preferably, a spiral groove is provided on the inner peripheral surface of the mist passage provided in the conductive member. This has the effect that the mist coolant sent into the mist passage flows in a small-diameter mist passage as a swirling flow at high speed and can be ejected from the tool tip without separating the mist. Play.

[0016]

[Embodiment of the invention]

 Next, specific embodiments of the tool holder according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the tool holder according to the present invention, in which (a) is an overall sectional view and (b) is a view seen in the direction of arrow Z. The tool holder 1 shown in this figure is used in a machining center, and a rear portion of the holder main body 2 (hereinafter simply referred to as a main body) has a known shape mounted on a through spindle of a machine tool (not shown). A tapered mounting portion 3 is formed, and an air blow connection member 4 is mounted on the rear end portion at the axial center. A well-known collet chuck 20 is incorporated in the tool mounting portion 5 at the front portion. The conductive member 10 forming the mist passage 11 is fitted to the rear end of the collet chuck 20.

The conductive member 10 is inserted into a through hole 6 penetrating from the inner rear end of the air blow connecting member 4 attached to the rear end of the main body 2 to the front tool mounting portion 5, and its front end 10 a is connected to the front end 10 a. The air blow connecting member 4 has a small diameter (for example, φ3 to 8 mm, the same applies hereinafter) having a large diameter and a small diameter from the middle to the rear end which fits into a hole formed in the axis of the air blow connection member 4. The mist passage 11 is formed in a hollow body. Then, the seal ring 13 is attached to the annular groove 10b provided on the distal end surface of the distal end portion 10a, and is brought into contact with the rear end surface of the claw holder 21 of the collet chuck 20, so that the fixing piece 7 screwed into the through-hole portion 6 is electrically connected. The mist passage 11 is pressed against the step end face 10 c of the member 10, and the outer periphery of the rear end is also provided with a seal ring 14 so that the mist passage 11 is kept airtight in the through hole 6.

A tool end adjusting part which is screwed into the claw holder 21 and the rear end of the shank a of the cutting tool A to be mounted is provided inside the cylindrical claw 22 of the collet chuck 20 in the tool mounting part 5. 1 (b), a through-hole 17a is formed at the center as shown in FIG. 1 (b), and a piece 17 having a longitudinally extending communication groove 17 '(strip groove) attached to one end surface thereof. Is provided so as to intervene. The communication groove 17 ′ provided on the piece 17 is connected to a not-shown through hole provided in the axis of the cutting tool A through the internal through hole 24 a of the tool end adjusting portion 24 from the mist passage 11 of the conductive member 10. It is provided for the purpose of branching a part of the coolant passing therethrough and communicating with a split slit portion 23 formed in the cylindrical claw 22 of the collet chuck 20. In addition, a seal ring 15 is attached to the tip of the tool end adjusting piece 24 attached to the claw holder 21, and the seal ring 15 is brought into contact with the end face of the piece 17 installed inside to make the cutting tool A The coolant flows into the through hole of the shaft center and the divided slit portion 23 formed in the cylindrical claw 22 of the collet chuck 20.

The tool holder 1 configured as described above is provided with a cutting tool A (for example, a drill, an end mill, a tap, or the like) provided with a through hole at the collet chuck 20 of the tool mounting portion 5 from the rear end to the front end of the axis. ) Is used.

The tool holder 1 is mounted on a through spindle of a machine tool, and a mist supply pipe (not shown) disposed in the through spindle is connected to a rear end of the conductive member 10 of the tool holder 1 so that coolant is supplied. It will be in the state of being supplied. Therefore, when the mist-converted coolant is supplied in the driving state, the mist passage 11 in the conductive member 10 has a small diameter, so that the influence of the centrifugal force due to the rotation acting on the tool holder 1 is reduced. The gas and liquid are sent into the tool mounting portion 5 at high speed without separation in the mist passage 11 which is hardly received and is kept airtight. In the tool mounting portion 5, the divided slit portion 23 and the piece 17 of the collet chuck 20 extend from the communication groove 17 'of the piece 17 interposed between the tool end adjusting piece 24 and the end of the shank a of the cutting tool A. Through the through hole 17a of the cutting tool, through the through hole of the cutting tool, and in the initial state, the air stagnant in the mist passage 11 of the tool holder 1 and the flow space in the tool mounting portion 5 is instantaneously changed by the pressure of the flowing coolant. After being discharged, the flow space in the tool holder 1 is quickly filled with the coolant, and the coolant can be promptly supplied to the cutting portion through the through hole of the cutting tool A.

In the flow path from the communication groove 17 ′ of the piece 17 in the tool mounting portion 5 through the split slit portion 23 of the collet chuck 20, the cutting tool A is supplied to the mist passage 11 and cuts from the through hole of the cutting tool A to the tip. If the coolant that is continuously supplied to the section is supplied beyond the required jetting state, it will flow out of the communication groove 17 'in addition to the flow out of the through hole, and the pressure balance will be maintained without becoming excessive. As a result, coolant is sprayed into the cutting part in a mist state, and cooling and chip removal are performed smoothly. Further, the coolant flowing out from the communication groove 17 'of the piece 17 through the divided slit portion 23 of the collet chuck 20 flows along the peripheral side surface of the cutting tool A even if the gas-liquid equilibrium is lost, and also has a cooling effect. There is no waste because it demonstrates.

Next, FIG. 2 is a sectional view of a main part of another embodiment of the tool holder. In this embodiment, the configuration is almost the same as that in the previous embodiment, except that a communication groove 25 is formed in the end face 24 'of the tool mounting end adjusting piece 24A incorporated in the collet chuck 20. With such a configuration and in the tool mounting portion, if measures are taken to prevent the coolant from flowing into the pawl holder mounting side of the collet chuck 20 in the main body 2, the same operation and effect as in the above embodiment can be obtained. Obtainable.

FIG. 3 shows still another embodiment of the tool holder, which is an overall sectional view (a) and a sectional view (b) of the conducting member.

The overall structure of the tool holder 1A of this embodiment is substantially the same as that of the above-described embodiment, and has a different configuration in the coolant flow path. Therefore, the same reference numerals are given to the same portions as those in the above-described embodiment, and the detailed description thereof will be omitted. The outer shape of the tool holder 1A has a known shape and structure, and a well-known collet chuck 20 is incorporated in the tool mounting portion 5 at the tip of the main body 2.

The conduction member 10A incorporated in the latter half of the main body 2 of the tool holder 1A has a small diameter mist passage 11 penetratingly formed in the axial center thereof, and a required surface is formed on the inner surface of the mist passage 11. A spiral groove 19 is engraved with a lead. As in the previous embodiment, the conductive member 10A is provided on the stepped end face 10c between the large-diameter distal end 10a inserted into the through hole 6 and the small-diameter middle to rear end in the main body 2. The fixing part 7 screwed into the screw part in the through hole part 6 is fixed and held in contact with the screw part, and the seal ring 13 fitted to the front end is made to contact the rear end of the claw holder 21 of the collet chuck 20 to collet chuck 20. It is configured so that coolant does not leak in the section up to the inside of.

In the tool holder 1A of this embodiment, when used, it is mounted on the through spindle of the machine tool in the same manner as in the other embodiments, and the supply operation of the mist-formed coolant is performed. When the coolant is fed into the mist passage 11 of the conducting member 10A connected to the pipe, the air remaining in the space in the flow passage of the coolant is lost by the coolant flowing at a high pressure as in the case of the above embodiment. The cutting tool A is discharged to the outside through the through hole of the cutting tool A. Then, the coolant flowing into the mist passage 11 is positively swirled by the spiral groove 19 formed on the inner surface of the mist passage 11. Therefore, the coolant is swirled to maintain the gas-liquid mixed state, and is pushed into the through hole of the cutting tool A through the through hole 24a of the tool end adjusting piece 24 following the mist passage 11, and the coolant is mist from the tip. In this state, the cutting edge and the cutting part are cooled and the chips are cooled and discharged smoothly using a small amount of cutting fluid, and the initial purpose can be achieved.

FIG. 4 is a sectional view of still another embodiment of the tool holder. The tool holder 1B of this embodiment has a main body 2B formed to be long in the axial direction, and a taper mounting portion 3 of a known shape to be mounted on a through spindle of a machine tool (not shown) is formed at a rear portion. An air blow connection member 4 is attached to a rear end portion of the shaft center, and a hollow conductive member forming a mist passage 11B in a through hole 6B penetrating from inside the air blow connection member 4 to a tool mounting portion 5B provided at a front end portion. 10B is fitted.

As shown in FIG. 4, the conductive member 10 B is inserted by connecting a plurality of pieces in series. In this specific example, the conductive member 10 B has a stepped hole 6 B formed in the main body 2 B. The parts 12a, 12b, and 12c having different outer shapes are sequentially connected in a fitting structure from the front end part to the rear end part in accordance with the hole shape, and the rearmost part 12c is screwed into the end of the through-hole part 6B. It is fixed so that it cannot be pulled out by the fixing piece 7B to be attached. The diameter of the mist passage 11B formed inside each of the pieces 12a to 12c is small and uniform from the front end to the rear end. The mist passage 11B has a diameter of, for example, 3 to 8 mm.

A seal ring 16 is attached to the outer periphery of the front end portion and the rear end portion of the conductive member 10B so that the corresponding through-hole portion 6B and the mist passage 11B are shut off. . Further, in the conductive member 10B having such a long dimension, it is not easy to form a hollow portion serving as the mist passage 11B, so that the hollow portion is divided into a plurality of portions as described above. If it can be manufactured with a single piece, it may be one piece.

In the tool holder 1B of this embodiment, when using a mounting means in which the shank portion a of the cutting tool A is directly fitted and fixed by a set bolt (not shown) in the tool mounting portion 5B. At least one groove 5c for balance adjustment is formed in the axial direction on either the inner surface of the hole into which the shank portion a of the cutting tool A is inserted or on the peripheral surface of the shank portion a of the cutting tool A. Is preferred.

In the tool holder 1B configured as described above, a known cutting tool A having a through hole provided from the rear end to the front end of the shaft is mounted on the tool mounting portion 5B for use. In this tool holder 1B, similarly to the above-described embodiment, when the mist is supplied to the through spindle of the machine tool and connected to the mist supply pipe and the mist is supplied, the mist passage in the conductive member 10B is provided. The air stagnated in the inside 11 is quickly passed to the outside from the passage 5b in the tool mounting portion 5B through the groove 5c for balance adjustment provided in the tool mounting portion 5B and the through hole of the cutting tool A. At the start of cutting, coolant is ejected to the cutting part through the through hole of cutting tool A, facilitating cutting and improving the effect of using misted coolant to achieve the intended purpose. it can.

The inner surface of the portion of the tool holder that is to be a coolant passage is coated with a polymer material having no affinity for water or oil, such as Teflon or urethane, so that mist hardly adheres. The effect may be enhanced by performing the following.

The groove 5c for balance adjustment or the split slit 23 of the collet chuck in the present embodiment corresponds to a leak portion as a fluid pressure balance adjusting means of the present invention.

[Brief description of the drawings]

FIGS. 1A and 1B show an embodiment of a tool holder according to the present invention, wherein FIG. 1A is an overall sectional view and FIG.

FIG. 2 is a sectional view of a main part of another embodiment of the tool holder.

FIG. 3 is an overall sectional view (a) and a sectional view (b) of a conductive member in still another embodiment of the tool holder.

FIG. 4 is a sectional view of still another embodiment of the tool holder.

[Explanation of symbols]

1, 1A, 1B Tool holder 2, 2B Main body 4 Air blow connection member 5, 5B Tool mounting part 5a, 24 Tool end adjusting part 5b, 24a Through hole of tool end adjusting part 5c Groove groove for balance adjustment 6, 6B Through holes 7, 7B Fixed pieces 10, 10A, 10B Conducting member 10a Tip of conducting member 10b Annular groove at tip of conducting member 10c Step end face of conducting member 11, 11B Mist passage 13, 14, 15, 16 Seal ring 17 Piece 17 ', 25 Communication groove 19 Spiral groove 20 Collet chuck 21 Claw holder 22 Cylindrical claw 23 Split slit part A Cutting tool a Shank part

[Procedure amendment]

[Submission date] September 16, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 4

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Claim 6

[Correction method] Change

[Correction contents]

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Innovator Isao Gureishi 3-1-1 Ueno, Hirakata-shi, Osaka Inside Komatsu Manufacturing Co., Ltd. Production Technology Development Center (72) Inventor Yusaku Yamamoto 1-6-chome Motomachi, Higashi-Osaka-shi, Osaka 53 Inside Nikken Co., Ltd.

Claims (6)

[Utility model registration claims] 1. A tool holder using a through-spindle coolant capable of supplying a mist-made coolant to a cutting blade portion of a cutting tool from a mist supply source through a through-spindle of a machine body and ejecting the mist coolant. The inner diameter of the tool is reduced to a small diameter, and a fluid pressure balance adjusting means for the supplied mist of coolant is supplied to the tool mounting portion. A tool holder provided with a leak part. 2. A conductive member and a tool mounting portion constituting the mist passage are attached so that the leading end of the conductive member is air-tightly joined to a rear end of a collet chuck incorporated in the tool mounting portion. A groove extending across the mist passage is provided at the shank mounting end of the tool and the inner end surface of the collet chuck, and the mist passage extends from the rear end of the collet chuck through the through hole of the tool axis and from the groove to the collet chuck. The tool holder according to claim 1, wherein the tool holder is configured to communicate with the divided slit portion. 3. The collet chuck according to claim 1, wherein the shank mounting end of the tool by the collet chuck and the groove extending across the mist passage at the inner end face of the collet chuck are provided on the end face of the tool end adjusting piece of the collet chuck. 3. The tool holder according to 2. 4. The tool holder according to claim 1, wherein a piece having a groove extending across the mist through hole is interposed between the tool end adjusting piece of the collet chuck and the shank end of the tool. . 5. The mist passage is fitted with a hollow conductive member having a small inner diameter from a rear end to a tool mounting portion at an axis thereof,
The tool holder according to claim 1, wherein a tip portion of the tool holder is air-tightly connected to the tool mounting portion. 6. The tool holder according to claim 1, wherein a spiral groove is provided on an inner peripheral surface of a mist passage provided in the conductive member.