JPH0518034Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a tool holder with a built-in speed increasing mechanism used to attach a cutting tool to the spindle of a machine tool, that is, a holder that is attached to the spindle of a machine tool. A main body, a support member that supports the holder main body only in a rotatable manner, a tool drive shaft that is supported concentrically within the holder main body and has a tool chuck portion at its tip that projects from the holder main body, and a tool drive shaft that accelerates the rotation of the holder main body. and a stopper pin that detachably engages with an engagement portion provided on a fixed member of the machine tool to hold the support member in a non-rotating state. This invention relates to a so-called speed-up type tool holder equipped with an oil supply device that supplies cutting oil from inside the tool holder to an oil supply hole of a cutting tool to be set.

(Prior Art and its Problems) In the speed-increasing tool holder as described above, it has been considered to supply cutting oil from within the tool holder to the oil supply hole of the set cutting tool. in this case,
It is necessary to send cutting oil to the oil supply passage in the tool drive shaft via the oil passage that radially penetrates the circumferential wall of the tool drive shaft that rotates at a higher speed than the holder main body by the speed increase mechanism. Cutting oil passing through the oil passage in the radial direction of the drive shaft circumferential wall toward the center of the tool drive shaft is subjected to a very large centrifugal force in the opposite direction as the tool drive shaft rotates at high speed.

In order to resist this centrifugal force and reliably supply cutting oil into the tool drive shaft that is rotating at high speed, it is necessary to sufficiently increase the cutting oil pressure just in front of the tool drive shaft. The path of the oil passage leading to just before the drive shaft is complex and narrow, so the pressure drop in the oil passage leading to just before the tool drive shaft is extremely large.
Moreover, there are some places along the way where it is difficult to adopt a seal structure that can withstand high pressure, so it is very difficult to sufficiently increase the cutting oil pressure just in front of the tool drive shaft.

On the other hand, the cutting tools set in the speed-up type tool holder as mentioned above are generally very thin tools with a diameter of several millimeters, and of course such small diameter cutting tools cannot be drilled in the axial direction. Since the provided oil supply hole also has a small diameter, if the cutting oil pressure supplied into the tool drive shaft is low, it is not possible to continuously and reliably supply a fixed amount of cutting oil into the oil supply hole.

Furthermore, in this type of enlarged tool holder, the internal structure of the holder is extremely complicated due to the built-in transmission gear and bearings for the speed-increasing gear mechanism, making it difficult to set up a lubrication route through the holder. In addition, there was a problem in that the setting of the oil supply path required a major change in specifications with respect to the conventional speed-up type tool holder.

Therefore, in the past, as a speed-up type tool holder, it was not possible to supply cutting oil to the tool oil supply hole through the tool holder, and at most it was difficult to
As disclosed in Publication No. 61-16243, etc., a method is adopted in which an oil supply pipe is installed outside the holder and cutting oil is supplied from the outside side to the cutting edge of the tool through the opening at the tip of the pipe. Tools with oil holes could not be used effectively.

(Means for Solving the Problems) The present invention proposes a speed-up type tool holder with a lubricating device that can solve the conventional problems as described above. In the speed-increasing type tool holder, an annular non-rotating member is provided which is fitted onto the tool drive shaft protruding from the holder body so as to be relatively rotatable and is connected and fixed to the support member, and the non-rotating member and the tool drive shaft are connected to each other. An annular pump chamber having an outer inner circumferential surface eccentric to the center of the drive shaft is formed at the fitting interface with the pump, and seal rings are interposed on both sides of the pump chamber to liquid-tightly seal the fitting interface. A plurality of pump vanes are installed in the tool drive shaft in a radial manner so as to face the pump chamber and move in and out in the radial direction, while a non-rotating member is inserted from the fixed member side of the machine tool through the stopper pin and an oil passage that passes through the inside of the pump chamber and supplies oil to the oil suction port of the pump chamber, and an oil passage that passes from the oil supply port of the pump chamber through the inside of the tool drive shaft and reaches the inner depth of the tool chuck portion. .

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

Reference numeral 1 denotes a holder main body which is attached to a spindle 2 of a machine tool via a tapered shank part 3 in a conventional manner, and includes a manipulator grip part 4 adjacent to the tapered shank part 3 and a small diameter cylinder shaft part 5. are formed concentrically. Reference numeral 6 denotes a tool drive shaft, the small diameter inner end 6a of which is rotatably supported concentrically by a bearing 7 within the cylindrical shaft portion 5, and the tip of the large diameter outer end 6b equipped with a conventionally known tool. A chuck portion 8 is provided.

9 is a bearing 10 attached to the cylindrical shaft portion 5 of the holder body 1.
This is a support member that is externally supported so that only relative rotation is possible through the support member 9 and the tool drive shaft 6.
A speed increasing gear mechanism 11 is interposed between the two. This speed-up gear mechanism 11 includes a planetary gear 13 supported by a support shaft 12 parallel to the axis of the holder body 1 while penetrating the cylindrical shaft portion 5 of the holder body 1 inwardly and outwardly; A central sun gear 15 is concentrically fitted onto the small-diameter inner end 6a of the tool drive shaft 6 and fixed with a screw 14 so as to engage, and a central sun gear 15 is attached to the inner side of the support member 9 so as to engage with the planetary gear 13. An internal sun gear 17 is fitted concentrically with the holder main body 1 and fixed by a pin 16.
It consists of

Reference numeral 18 is a stopper pin, and a cylindrical body 19 is screwed into the base of the stopper pin so as to be movable in the axial direction.
A locking piece 20 for locking the holder body is connected to the tip of the holder body 9. 21 is a lock nut screwed onto the stopper pin 18. The cylindrical body 19 is
A stopper pin support part 9a connected from the support member 9 is supported so as to be movable in and out within a certain range parallel to the axis of the holder main body 1, and the projecting direction approaches the fixed member 20 of the machine tool by a spring 22. is energized by Further, a detent pin 23 protruding from the stopper pin support portion 9a passes through the locking piece 20 so as to be movable in the axial direction. Reference numeral 24 denotes a recess formed in the periphery of the holder main body 1, and when the cylindrical body 19 (stopper pin 18) protrudes due to the biasing force of the spring 22 (when not in use), the locking piece The distal end portions of 20 fit together to connect the support member 9 and the holder main body 1.

As shown in FIG. 1, when the holder main body 1 is attached to the spindle 2 of a machine tool via the taper shank portion 3, the stopper pin 18 is fitted into the tip of the stopper pin 18 and the stopper pin 18 is attached to the cylindrical body 19.
At the same time, an engaging portion 25 for moving the spindle 2 backward against the biasing force of the spring 22 projects from a fixing member 26 that supports the spindle 2 . As a result of the stopper pin 18 being moved backward by the engaging portion 25, the locking piece 20 that moves backward together is released from the recess 24 of the holder body 1, and if the rotation of the holder body 1 relative to the support member 9 is possible. Close.

In the speed-up type tool holder as described above, an annular non-rotating member 27 is fitted onto the large-diameter outer end 6b of the tool drive shaft 6 protruding from the holder body 1 so as to be relatively rotatable. The cup-shaped portion 27a continuous from the non-rotating member 27 is connected to the support member 9.
It is fitted onto the small-diameter stepped portion 9b and fixed with a screw 28. 29 is a pump mechanism for pressurizing cutting oil;
It is constructed at a fitting portion between the non-rotating member 27 and the tool drive shaft 6. This pump mechanism 29 includes pump vanes 30 that are radially installed inside the large-diameter outer end 6b of the tool drive shaft 6 so as to be movable in the radial direction. The pin 31 is installed inside the rotating member 27 and
and an annular casing 33 fixed by a holding member 32, and an outer inner surface formed between an eccentric inner circumferential surface of the annular casing 33, a non-rotating member 27, a holding member 32, and an outer circumferential surface of the tool drive shaft 6. It is a vane pump type having an annular pump chamber 34 whose peripheral surface is eccentric from the center of the drive shaft, and includes an oil intake port 35 and an oil supply port 36 provided in the annular casing 33.

37 is an oil passage for supplying oil from the fixed member 26 side of the machine tool to the oil suction port 35 of the pump mechanism 29 via the inside of the stopper pin 18;
is an oil passage that supplies oil from the oil feed port 36 of the pump mechanism 29 to the oil supply passage 39 in the tool drive shaft 6. The oil passage 37 is connected to an oil passage 43 in the stopper pin 18, which has a check valve 42 consisting of a spherical valve body 40 and a spring 41 at its tip, and a non-rotating member 27.
An annular oil passage 4 formed in the cup-shaped portion 27a of
4. The stopper pin support portion 9a of the support member 9 and the non-rotating member 27 are connected so that the oil passage 43 in the stopper pin 18 and the annular oil passage 44 communicate with each other.
and an oil passage 46 formed in the non-rotating member 27 so as to communicate the annular oil passage 44 and the oil suction port 35. The oil passage 38 also includes an annular oil passage 47 formed on the inner peripheral surface of the non-rotating member 27 adjacent to the annular casing 33 and communicating with the oil feed port 36; and the tool drive shaft 6 so as to communicate with the oil supply passage 39 in the tool drive shaft.
Oil passages 48 formed radially at the large diameter outer end 6a of the
It consists of.

In the oil supply path 39 of the tool drive shaft 6, the rear end peripheral edge of the cutting tool 49, which is fitted and fixed to the tip of the tool drive shaft 6 by the tool chuck portion 8, is oil-tight with a tapered surface 50a at the tip. A cylindrical body 50 for positioning the rear end of the tool is screwed to be movable in the axial direction. Reference numeral 51 denotes an oil passage hole formed in the peripheral wall of this cylindrical body 50. The cutting tool 49 is provided with an oil supply hole 49a that penetrates in the axial direction between the rear end surface and the tip end so as to communicate with the passage in the cylindrical body 50.

In addition, the stopper pin 18 is disposed in the engaging portion 25 where the tip of the stopper pin 18 fits and abuts.
An oil passage 52 is provided so as to communicate with the oil passage 43 inside, and an oil supply pipe 53 is connected to this oil passage 52. Further, the annular oil passage 44 is formed by an annular groove provided on the inner circumferential surface of the non-rotating member 27 and a small diameter stepped portion 9 of the supporting member 9.
b, and the joint interface between the inner and outer circumferential surfaces on both sides is a seal ring 5.
4 and 54 are liquid-tightly sealed. Further, between the inner periphery of the non-rotating member 27 on both sides of the pump output 34 and the outer periphery of the tool drive shaft 6, a seal ring 55 is provided on the base end side of the oil passage 38, and a ring-shaped holding member is provided on the distal end side. With the seal rings 56a and 56b fitted on both the inner and outer peripheral surfaces of 32,
Each is sealed liquid-tight.

As shown in FIG. 1, when the holder main body 1 is attached to the spindle 2 of a machine tool via the taper shank 3, the stopper pin 18 is attached to the engaging portion 25.
The locking piece 20 is moved backward against the biasing force of the spring 22, and the locking piece 20 is disengaged from the recess 24 of the holder body 1, and the lock of the holder body 1 is released. At the same time, the support member 9 is held unrotatable by the engagement between the stopper pin 18 and the engagement member 25. When the holder main body 1 is rotationally driven by the spindle 2 in such a state, the planetary gear 13 of the speed increasing gear mechanism 11 revolves and rotates due to engagement with the internal sun gear 17. The tool drive shaft 6 is rotationally driven via the sun gear 15 at a higher speed than the holder body 1.

On the other hand, the oil passage 5 in the engagement portion 25 from the oil supply pipe 53
The cutting oil supplied to 2 pushes open the check valve 42 in the stopper pin 18 and enters the oil passage 43.
It reaches the oil intake port 35 of the pump mechanism 29 via the piping 45, the annular oil passage 44, and the oil passage 46. Here, each vane 30 of the pump mechanism 29 is moved by centrifugal force to the eccentric inner peripheral surface of the pump chamber 34 (the annular casing 33
It rotates at high speed together with the tool drive shaft 6, which rotates at high speed while slidingly contacting the inner peripheral surface of 34, and the vane 3 is sucked into the pump chamber 34.
Pressurized by 0.

The cutting oil pressurized by the pump mechanism 29 is pushed out from the oil supply port 36, passes through the annular oil passage 47 and the radial oil passage 48 of the tool drive shaft 6, and enters the oil supply passage 39 inside the tool drive shaft 6. sent to. That is, since the radial oil passage 48 of the tool drive shaft 6 rotates at high speed, the cutting oil moving toward the center within the radial oil passage 48 is subjected to a large centrifugal force in the opposite direction. The oil is pumped through the pump mechanism 2.
Since it is pressurized immediately before by 9, it is fed into the oil supply passage 39 in the tool drive shaft 6 against the centrifugal force.

The cutting oil sent into the oil supply path 39 passes through the oil supply port 51 of the tool rear end positioning cylindrical body 50 and the passage inside the cylindrical body 50, and then reaches the oil supply hole opened on the rear end surface of the cutting tool 49. 49a, and is ejected from the tip of the cutting tool 49 to lubricate and cool the cutting part.

Incidentally, the speed increasing gear mechanism 11, the connection structure of the non-rotating member 27 to the support member 9, the oil passages 37, 38, etc. are not limited to the configurations of the above embodiments.

(Operations and Effects of the Invention) According to the tool holder of the present invention, a pump mechanism is built in which performs a pumping action by relative rotation between the tool drive shaft and a non-rotating member fitted onto the tool drive shaft, and the tool holder is provided with Conventionally, the cutting oil is supplied to the oil suction port of the pump mechanism through the stopper pin, pressurized by the pump mechanism, and sent through the tool drive shaft and deep into the tool chuck. Pressurization by a tool with an oil hole, which could not be used effectively in a die tool holder, has been realized, and since the tool drive shaft rotates at a very high speed due to the speed-increasing gear mechanism, cutting oil can be applied to the center of the drive shaft. Even though the cutting oil is subjected to extremely large centrifugal force when feeding in the radial direction, it is possible to pressurize just before that, making it possible to continuously and reliably supply a constant amount of cutting oil to the tool's oil supply hole. Even if the oil supply hole has a small diameter, the cutting oil can exert a sufficient and efficient cooling effect on the tool cutting edge and the cutting part without particularly increasing the pressure on the cutting oil pressure source side.

Furthermore, in the present invention, as the pump mechanism, a plurality of pump vanes are installed inside the tool drive shaft in a radial manner so as to be able to move forward and backward in the radial direction. The pump mechanism employs a vane pump system that exerts a pumping action by slidingly contacting the eccentric outer circumferential wall of an annular pump chamber constructed at the fitting interface between the rotating member and the tool drive shaft. The pump mechanism itself is extremely simple in structure, has no parts that cause fatigue deterioration, and has excellent operation reliability and durability. Furthermore, by using the non-rotating member, the transmission gear attached to the speed increasing gear mechanism Since the oil supply route and pump mechanism can be set up while avoiding the complicated internal structure with built-in bearings, etc., the entire oil supply mechanism can be avoided from becoming complicated, the processing for forming it is simple, and it has a conventional speed-increasing gear mechanism. There is no need to make any major specification changes to the tool holder, which reduces the cost increase required to incorporate the lubrication mechanism, and existing tool holders of this type can be made with the lubrication device of the present invention by simply modifying them. It has the advantage of being able to be converted into a new one, and also of preventing cutting oil from seeping into the speed-increasing gear mechanism.

[Brief explanation of drawings]

Figure 1 is a partially longitudinal side view showing the state of use;
This figure and FIG. 3 are cross-sectional views of the main parts. DESCRIPTION OF SYMBOLS 1... Holder body, 2... Spindle of machine tool, 3... Taper shank part, 4... Gripping part for manipulator, 6... Tool drive shaft, 8...
Tool chuck portion, 9... Support member, 11... Speed increasing gear mechanism, 13... Planetary gear, 15... Central sun gear, 17... Internal sun gear, 18... Stopper pin, 20... Locking piece , 25...Stopper pin engaging portion, 26...Machine tool fixing member, 27...
...Non-rotating member, 29... Pump mechanism, 30... Pump vane, 33... Annular casing, 34...
...Annular pump chamber, 35...Oil suction port, 36...Oil feed port, 37, 38...Oil passage, 39...Oil supply path in tool drive shaft, 42...Check valve, 44, 47... Annular oil passage, 48... Radial oil passage, 49... Cutting tool, 49a... Oil supply hole, 50... Cylindrical body for tool rear end positioning, 51... Oil passage, 53... Oil supply pipe, 55, 56a, 56b... Seal ring.

Claims (1)

[Scope of utility model registration request] A holder body that is attached to the spindle of a machine tool, a support member that rotatably supports the holder body, and a tool drive shaft that is supported concentrically within the holder body and has a tool chuck portion at the tip that protrudes from the holder body. , a speed-increasing gear mechanism that speeds up the rotation of the holder body and transmits it to the tool drive shaft; and a speed-increasing gear mechanism that removably engages with an engaging portion provided on a fixed member of the machine tool to prevent the support member from rotating. In a tool holder equipped with a stopper pin for holding the tool in a fixed position, an annular non-rotating member is provided, which is fitted onto the tool drive shaft protruding from the holder body so as to be relatively rotatable, and is connected and fixed to the supporting member. An annular pump chamber having an outer inner peripheral surface eccentric from the center of the drive shaft is formed at the fitting interface between the member and the tool drive shaft, and the fitting interface is liquid-tightly sealed on both sides of the pump chamber. A seal ring is interposed, and a plurality of pump vanes are installed on the tool drive shaft in a radial manner so as to face the pump chamber and move in and out in the radial direction. an oil passage that passes through the inside of the non-rotating member and supplies oil to the oil suction port of the pump chamber; and an oil passage that passes from the oil supply port of the pump chamber through the inside of the tool drive shaft to the inner depth of the tool chuck. A tool holder with a refueling tool provided.