JP4770585B2 - Tool holder for machine tools - Google Patents

Description

  The present invention relates to a tool holder for a machine tool in which a cutting tool is mounted on a tip portion.

  In recent years, a tool holder 300 for a machine tool as shown in FIG. 3 has been widely used. A cutting tool 14 is attached to the tip of the tool holder 300, and the cutting tool 14 is fixed to the tool holder 300 by a fixing member 21.

  A through hole 11 is formed in the tool holder 300 from the front end portion to the rear end portion of the tool holder, and a fluid for lubricating cooling is supplied to the cutting tool 14 in the through hole 11. A fluid supply pipe 13 is disposed. One end portion 13 a of the fluid supply pipe 13 is connected to the pull stud 10, and the other end portion 13 b is connected to the fluid passage 15 of the cutting tool 14 via the joint portion 19.

As the lubricating cooling fluid supplied to the cutting tool 14, a high-pressure air mixed with a minute amount of viscous cutting oil and made into a mist (oil mist) is used. This oil mist Is supplied from the one end portion 13a side of the fluid supply pipe 13 by a supply device (not shown) during machining of the workpiece 40, and flows through the fluid supply pipe 13 to reach the cutting tool 14 (see, for example, Patent Document 1). Note that an axis AA shown in FIG. 3 is a rotation axis when the cutting tool 14 and the tool holder 300 rotate when machining the workpiece 40.
Japanese Patent Laid-Open No. 10-277876

  However, according to the invention disclosed in Patent Document 1, when the workpiece 40 is processed, the fluid supply pipe 13 rotates together with the cutting tool 14 and the tool holder 300. When the oil mist flows in the rotating fluid supply pipe 13, the oil mist is attached to the inner wall surface of the fluid supply pipe 13 during the flow due to the influence of the centrifugal force generated by the rotation of the fluid supply pipe 13. There is. Then, the flow amount of the oil mist decreases, and there is a problem that a sufficient amount of oil mist cannot reach the cutting tool 14.

  In addition, vibration or deflection may occur in the fluid supply pipe 13 as the fluid supply pipe 13 rotates. Then, one end part 13a of the fluid supply pipe 13 comes into contact with the pull stud 10, or distortion occurs at the connection part between the other end part 13b and the joint part 19, and the fluid supply pipe 13, the pull stud 10, and the joint The part 19 and the like may be damaged.

  Therefore, the present invention has been made in view of the above problems, and its purpose is to provide a fluid disposed in the through hole of the tool holder when machining the workpiece (when the tool holder rotates). Oil mist can be prevented from adhering to the inner wall surface of the supply pipe, and a sufficient amount of oil mist can reach the cutting tool without reducing the amount of oil mist flow. It is an object of the present invention to provide a tool holder for a machine tool that can suppress bending and prevent damage to a fluid supply pipe, a pull stud, a joint, and the like.

In order to solve the above problems, a tool holder for a machine tool according to claim 1 is a tool holder for a machine tool in which a processing tool for performing predetermined processing on a workpiece is mounted, and the rotation of the tool holder A through-hole is formed along the axis, and is inserted into the through-hole and includes a fluid supply pipe that supplies a fluid for lubrication and cooling to the processing tool when performing predetermined processing, and a tool holder and a fluid supply pipe. A bearing member provided between the bearing member for rotatably supporting the fluid supply pipe with respect to the tool holder, and both ends of the fluid supply pipe are connected to a rotating portion of the tool holder, and the tool provided at the connection portion. attenuates the rotation of the holder and a labyrinth seal having a rotating attenuation function of transmitting to the fluid supply pipe, the rotational speed of the fluid supply pipe at the time of performing the predetermined processing, the less than the rotational speed of the tool holder Features.

  According to the first aspect of the present invention, when the workpiece is processed (when the tool holder is rotated), the number of rotations of the fluid supply pipe can be significantly less than the number of rotations of the tool holder.

Thereby, the oil mist (fluid for lubricating cooling) in the fluid supply pipe is not easily affected by the centrifugal force generated with the rotation of the fluid supply pipe, and is difficult to adhere to the inner wall surface of the fluid supply pipe. Therefore, a sufficient amount of oil mist can reach the cutting tool (processing tool) without reducing the flow amount of oil mist. Furthermore, since the fluid supply pipe is supported by the bearing member, vibration and deflection generated in the fluid supply pipe are suppressed, and damage to the fluid supply pipe, the pull stud, the joint portion, and the like can be prevented. As the structure of the rotary damping function seal member attenuates the rotation of the tool holder to transfer the fluid supply pipe, La Birinsushi Le is preferred.

A tool holder for a machine tool according to a second aspect is the tool holder for a machine tool according to the first aspect, wherein the processing tool is connected to a fluid supply pipe and flows a fluid, and is connected to the fluid path. And a discharge port for discharging fluid toward the outside. According to invention of Claim 2 , the oil mist which reached | attained the processing tool can be discharged toward a workpiece | work, and lubrication and cooling at the time of workpiece | work processing can fully be performed.

The tool holder for a machine tool according to claim 3 is the tool holder for a machine tool according to claim 1 or 2 , wherein the fluid supply pipe has a weight attached to an outer frame thereof, and the weight balance is biased. It is characterized by that. According to the third aspect of the present invention, if the weight is attached to the lower side of the outer frame of the fluid supply pipe, the center of gravity of the fluid supply pipe is located below the axis. Thereby, even if it is a case where the rotation direction of a tool holder is changed to an opposite direction in a short time, the rotation speed of a fluid supply pipe | tube can be decreased rather than the rotation speed of a tool holder. Furthermore, the fluid supply pipe can be non-rotated regardless of the rotation of the tool holder.

The tool holder for machine tools according to claim 4 is the tool holder for machine tools according to claim 1 or 2 , wherein the fluid supply pipe has a flow path through which a fluid for lubrication cooling flows. It is characterized by being deviated from the heart and having an unbalanced weight balance.

According to the fourth aspect of the present invention, if the fluid supply pipe is installed so that the thick part is on the lower side, the center of gravity of the fluid supply pipe is below the axis. Thereby, even if it is a case where the rotation direction of a tool holder is changed to an opposite direction in a short time, the rotation speed of a fluid supply pipe | tube can be decreased rather than the rotation speed of a tool holder. Furthermore, the fluid supply pipe can be non-rotated regardless of the rotation of the tool holder.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or is equivalent, and the description is abbreviate | omitted.

(First embodiment)
FIG. 1 shows a schematic cross section of a tool holder 100 for a machine tool and a spindle member 110 in the machine tool according to the first embodiment of the present invention. First, the main shaft member 110 will be described.

  A mounting hole 111 for inserting and mounting the tool holder 100 is formed in the distal end portion 110 a of the main shaft member 110. A hollow portion connected to the mounting hole 111 is formed inside the main shaft member 110, and an inner portion connected to the pull stud 10 formed on the rear end portion 100b of the tool holder 100 according to the present embodiment is formed in the hollow portion. A sleeve 112 is disposed.

  One end of a flow pipe 114 is connected to the inner sleeve 112. Also, the other end (not shown) of the flow pipe 114 is directed toward the inner sleeve 112 with an oil mist as a lubricating cooling fluid mixed into the high pressure air by mixing a minute amount of viscous cutting oil into a mist. It is connected to a supply device (not shown) for supply.

  Since both ends of the flow tube 114 are connected by a seal member that attenuates and transmits the rotation of the main shaft member 110, even when the inner sleeve 112 rotates together with the main shaft member 110 when processing the workpiece 40, The rotational speed of the flow tube 114 is smaller than the rotational speed of the main shaft member 110 and the inner sleeve 112. Therefore, the oil mist supplied by a supply device (not shown) flows from the other end of the flow tube 114 to one end without reaching the inner wall of the flow tube 114 due to the centrifugal force, and reaches the inner sleeve 112. can do.

  The contact surface 115 between the inner sleeve 112 and the pull stud 10 is sealed with an elastic body (not shown) or metal packing, and there is no fear that oil mist reaching the inner sleeve 112 leaks out.

  Next, the tool holder 100 of the machine tool according to the present embodiment will be described. The tool holder 100 for a machine tool according to the present embodiment is equipped with a cutting tool 14 as a processing tool for processing the workpiece 40 at the tip end portion 100a. The cutting tool 14 includes a cutting edge 14a, and the cutting tool 14 has a rotation axis AA that is a rotation axis when the cutting tool 14 and the tool holder 100 rotate when machining the workpiece 40. A fluid passage 15 extending in the direction is formed. Further, the cutting tool 14 is formed with a discharge passage (not shown) connected from the fluid passage 15 to the outside.

  The cutting tool 14 can be attached and detached according to the material of the workpiece 40, processing conditions, and the like. When the cutting tool 14 is mounted on the tool holder 100, one end of the cutting tool 14 is connected to a joint portion 19 described later. And is fixed to the tool holder 100 by a fixing member 21 such as a screw.

  A through hole 11 is formed in the tool holder 100 so as to penetrate from the front end portion 100a to the rear end portion 100b in the direction of the rotation axis AA. The shape of the through hole 11 is rotationally symmetric with respect to the rotation axis AA in consideration of the balance when the tool holder 100 rotates. Further, the thickness and the like of the tool holder 100 are determined in consideration of the material and strength of the tool holder 100.

  The tool holder 100 includes a pull stud 10 fixed to the tool holder 100 at a rear end portion 100b, and a communication flow path 12 penetrating the pull stud 10 is formed in the pull stud 10. The communication flow path 12 penetrating the pull stud communicates a fluid supply pipe 13 and a flow pipe 114, which will be described later, and the oil mist that has reached the inner sleeve 112 passes through the communication flow path 12 to be described later. Flows to 13. As described above, the contact surface 115 between the inner sleeve 112 and the pull stud 10 is sealed with an elastic body (not shown) or a metal packing, so that oil mist reaching the inner sleeve 112 may be leaked. There is no.

  A metal (for example, iron) fluid supply pipe 13 that supplies oil mist toward the cutting tool 14 is disposed in the through hole 11 formed in the tool holder 100. One end 13a of the fluid supply pipe 13 is connected to the pull stud 10, and the other end 13b is provided with a joint portion 19 having an enlarged diameter, and one end of the cutting tool 14 is connected thereto.

  As described above, the flow path through which the oil mist flows continues from the flow pipe 114 to the discharge path (not shown) of the cutting tool 14. That is, the oil mist supplied by a supply device (not shown) and flowing in the flow pipe 114 and reaching the inner sleeve 112 further passes to the communication flow path 12, the fluid supply pipe 13, and the fluid path 15 (cutting tool 14). Can flow.

  When machining the workpiece 40, the spindle member 110 is rotated by the action of a drive motor or the like (not shown), and the tool holder 100, the pull stud 10, and the tool holder attached to the spindle member 110 as the spindle member 110 rotates. The cutting tool 14 attached to 100 rotates. On the other hand, a seal member having a rotational damping function for attenuating the rotation of the tool holder 100 and transmitting it to the fluid supply pipe 13 is arranged at the connection portion of the joint portion 19 at the one end 13a of the fluid supply pipe 13 and the other end 13b. Therefore, the rotational speed of the fluid supply pipe 13 is smaller than the rotational speed of the tool holder 100. Specifically, the tool holder 100 rotates at a speed of several thousand revolutions or more per minute, whereas the fluid supply pipe 24 can be rotated at a rotational speed of about a few to a few tens of revolutions per minute.

  Therefore, according to the tool holder 100 for a machine tool according to the present embodiment, the oil mist flowing in the fluid supply pipe 13 is less affected by the centrifugal force generated with the rotation of the tool holder 100. Oil mist does not easily adhere to the inner wall surface of the fluid supply pipe 13, and a sufficient amount of oil mist reaches the fluid passage 15 of the cutting tool 14 without decreasing the flow amount of the oil mist.

  The oil mist that has reached the fluid passage 15 of the cutting tool 14 is discharged from the discharge path (not shown) toward the work 40 by the centrifugal force generated with the rotation of the cutting tool 14 and the action of high-pressure air. (Curve arrow in FIG. 1). Thereby, lubrication cooling at the time of workpiece processing by oil mist is performed. In addition, as a sealing member which has a rotation damping function, the labyrinth seal which is a non-contact-type seal | sticker which is a well-known structure can be used, for example.

  By the way, the fluid supply pipe 13 is supported by bearing members 16 and 17 arranged in the through hole 11 on the other end 13 b side and substantially the center.

  Specifically, the outer frame portions 16 a and 17 a of the bearing members 16 and 17 are in contact with the inner wall of the tool holder 100, and the inner frame portions 16 b and 17 b are in contact with the fluid supply pipe 13. A plurality of steel balls are arranged between the outer frame portions 16a and 17a and the inner frame portions 16b and 17b of the bearing members 16 and 17 so as to surround the fluid supply pipe 13, and the inner frame portions 16a and 17a It can rotate independently of the frame parts 16b and 17b.

  Thereby, according to the tool holder 100 for machine tools which concerns on this embodiment, when processing with respect to the workpiece | work 40, even if the tool holder 100 rotates, the vibration and bending which generate | occur | produce in the fluid supply pipe | tube 13 are suppressed. It is possible to prevent the fluid supply pipe 13, the pull stud 10, the joint portion 19 and the like from being damaged.

(Other embodiments)
Another embodiment of the present invention will be described with reference to FIG. FIG. 2A is a schematic cross-sectional view of a tool holder 200 for a machine tool according to another embodiment of the present invention. FIG. 2B is a cross-sectional view of a state in which the weight 20 is attached to the lower side of the fluid supply pipe 13 in the drawing. FIG. 2C is a cross-sectional view of the fluid supply pipe 23.

(Part 1)
The tool holder 200 for machine tools can be rotated in both the left and right directions, and the rotation direction of the tool holder 200 may be changed to the opposite direction in a short time depending on the setting of machining conditions for the workpiece 40 and the like. However, even in such a case, it is desirable that the number of rotations of the fluid supply pipe 13 is smaller than the number of rotations of the tool holder 200 in order not to reduce the flow rate of the oil mist. Furthermore, it is desirable that the fluid supply pipe 13 is non-rotating regardless of the rotation of the tool holder 200.

  Therefore, when the machine tool to which the tool holder 200 is mounted is a horizontal type (horizontal type), the tool holder 200 according to this embodiment has a lower side of the outer frame of the fluid supply pipe 13 as shown in FIG. If the weight 20 is attached, the weight balance of the fluid supply pipe 13 is biased, and the center of gravity of the fluid supply pipe 13 is located below the axis. According to the inventor's knowledge, this makes it possible to reduce the rotational speed of the fluid supply pipe 13 relative to the rotational speed of the tool holder 200. Furthermore, by adjusting the weight of the weight 20, the fluid supply pipe 13 can be made non-rotated regardless of the rotation of the tool holder 200.

  In this embodiment, as shown in FIG. 2 (b), the weight 20 is mounted in the vicinity of the substantially central portion of the fluid supply pipe 13, but the position where the weight 20 is mounted is not limited to this, and the weight is not limited to this. The same effect can be obtained even when 20 is mounted at a desired position.

(Part 2)
Instead of attaching the weight 20 to the lower side of the outer frame of the fluid supply pipe 13, the fluid supply pipe 24 in which the flow path 25 through which the oil mist flows is formed so as to be offset from the axial center can also be used. Also, the number of rotations of the fluid supply pipe 24 can be reduced.

  That is, the fluid supply pipe 24 is formed so as to be offset from the axial center as in the fluid supply pipe 24 whose cross section is shown in FIG. 2C, so that the fluid supply pipe 24 has a thick portion 22 and a thin portion 23. Is formed. If the fluid supply pipe 24 is installed in the through hole 11 so that the thick portion 22 is on the lower side, the weight balance of the fluid supply pipe 24 is biased, and the center of gravity of the fluid supply pipe 24 is centered on the axis. Will be below. According to the inventor's knowledge, this makes it possible to reduce the rotational speed of the fluid supply pipe 24 relative to the rotational speed of the tool holder 200. Furthermore, by adjusting the position of the flow path 25, the fluid supply pipe 24 can be made non-rotating regardless of the rotation of the tool holder 200.

  Although the best mode for carrying out the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. is there.

  In the invention according to the dependent claims of the present invention, a part of the constituent features of the dependent claims can be omitted.

It is a figure which shows the schematic cross section of the tool holder for machine tools which concerns on the 1st Embodiment of this invention. (A) is a figure which shows the schematic cross section of the tool holder for machine tools which concerns on other embodiment of this invention, (b) and (c) are suitable for the tool holder for machine tools which concerns on other embodiment. It is sectional drawing of the fluid supply pipe | tube used for. It is a figure which shows the schematic cross section of the tool holder for the conventional machine tools.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pull stud, 11 ... Through-hole, 12 ... Communication flow path, 13, 24 ... Fluid supply pipe, 14 ... Cutting tool, 14a ... Cutting blade, 15 ... Fluid passage, 16, 17 ... Bearing member, 19 ... Joint part, 20 ... Weight, 21 ... Fixing member, 25 ... Flow path, 40 ... Workpiece, 110 ... Main shaft Element

Claims (4)

A tool holder for a machine tool equipped with a processing tool for performing predetermined processing on a workpiece,
A through hole is formed along the rotation axis of the tool holder, and a fluid supply pipe that is inserted into the through hole and supplies a fluid for lubricating cooling to the processing tool when performing the predetermined processing;
A bearing member provided between the tool holder and the fluid supply pipe, and rotatably supporting the fluid supply pipe with respect to the tool holder;
Both ends of the fluid supply pipe are connected to a rotating portion of the tool holder, and a labyrinth having a rotational damping function provided at the connection portion for attenuating the rotation of the tool holder and transmitting it to the fluid supply pipe provided with a seal, the,
The tool holder for a machine tool, wherein the rotation speed of the fluid supply pipe when performing the predetermined machining is less than the rotation speed of the tool holder. The processing tool is:
A fluid passage connected to the fluid supply pipe and flowing the fluid;
Tool holder for a machine tool according to claim 1, wherein the discharge passage, that you have been formed and connected to the fluid passage discharges toward the fluid to the outside. The fluid supply pipe is
The tool holder for a machine tool according to claim 1 or 2 , wherein a weight is attached to the outer frame, and the weight balance is uneven . The fluid supply pipe is
Said lubrication flow path cooling fluid flows is formed biased from the axis of the fluid supply tube, for a machine tool according to claim 1 or 2, characterized in that the deviation has occurred in the weight balance Tool holder.

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