JP5294134B2 - Tap holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tap holder that can hold tapping oil therein and jet and apply a small amount of the tapping oil to a tap. <P>SOLUTION: The tap holder includes: a holder body having a shank; a tap collet removably fitted in the holder body; a cylinder chamber provided in a hollow part of the holder body; a first chamber attached to the cylinder chamber, and located adjacent to the shank to allow compressed air to enter; a piston located adjacent to the tap collet, and forming a cylinder chamber divided in a second chamber filled with taping oil beforehand; an air path provided in the shank, and for leading the compressed air for driving the piston to the first chamber; a releasing path provided in the shank, and for releasing the compressed air to the outside; an oil path for leading the tapping oil in the second chamber to a jet port provided at the lower end of the tap collet; and a check valve provided in the oil path of the tap collet, and configured to open when the pressure of the tapping oil reaches a predetermined pressure or higher. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a tap holder, and more particularly to a tap holder that can inject tapping oil stored in advance inside a shank around the tap with compressed air.

  In general, a tap holder is composed of a tap collet that holds a tool (tap) for threading (tapping) and a tap holder main body to which the tap collet is fitted. Is provided.

  During tapping, an aqueous solution called coolant is used. In the tap holder of Patent Document 1, a coolant passage extending in the longitudinal direction of the shaft core is provided inside, and the coolant sent out by the pump is sprayed toward the teeth of the tap through the passage during tapping. Is done. In addition to conventional steel, the number of difficult-to-cut materials, such as stainless steel, titanium, and Inconel, has been increasing as materials for tapping. In order to deal with these difficult-to-cut materials, chlorine-based and molybdenum-based additives are added to the coolant, but it is not sufficient for heavy cutting.

  On the other hand, cutting oil in which ceramic fine powder is blended with vegetable oil that does not solidify does not oxidize at high temperatures, maintains lubricity, reduces cutting resistance, and extends tool life. Since there is no corrosion, it can be used for materials such as copper. Such cutting oil, that is, tapping oil, is applied manually to the tap after stopping the machine or to the screw hole using a tapping oil supply holder that is different from the tapper. . In addition, the amount of oil applied at one time is as small as 0.02 cc, for example, and it is desirable to apply such a small amount of tapping oil to taps and screw holes without manual operation. The mechanism that supplies coolant through a passage in the tap holder with a pump as in Literature 1 cannot sufficiently cope with it.

JP 2003-266274 A

  An object of the present invention is to provide a tap holder with a tapping oil application function capable of containing tapping oil, spraying a small amount, and applying it to a tap.

  A tap holder according to the present invention includes a holder main body having a shank attached to a spindle of a machine tool, a tap collet that is detachably fitted to the holder main body, a cylinder chamber provided in a hollow portion of the holder main body, A piston that divides the cylinder chamber into a first chamber that is mounted in a cylinder chamber and is located on the shank side and into which compressed air enters; and a second chamber that is located on the tap collet side and is prefilled with tapping oil; An air passage that is provided in the shank and guides compressed air that drives the piston to the first chamber, an escape passage that is provided in the shank and that releases the compressed air to the outside, and an injection port at a lower end of the tap collet The oil passage for guiding the tapping oil in the two chambers and the oil passage of the tap collet A check valve that opens when the pressure exceeds a predetermined pressure, and when a predetermined amount of compressed air is supplied from the machine tool to the first chamber, the piston descends to open the check valve, and from the injection port Tapping oil is sprayed around the tap.

  The oil passage includes a first oil passage provided in a bottom portion of the tap holder body and a second oil passage provided in the tap collet. When the tapping oil in the cylinder chamber is used up, the tap holder The tap collet is removed from the main body, and tapping oil is supplied to the second chamber of the cylinder chamber through the first oil passage from an oil filling tool mounted instead of the tap collet.

  According to the tapping oil application holder of the present invention, (1) the cylinder chamber is provided in the hollow portion of the holder main body, and the tapping oil is filled in the second chamber divided by the piston. Can be kept inside. (2) For driving the piston, for example, a mechanism for controlling the supply time of the compressed air provided in the machine tool can be used. Since this compressed air is guided to the first chamber of the cylinder chamber via the air passage, the piston is driven and the tapping oil in the second chamber can be injected from the injection port. (3) Since the escape passage of the compressed air is provided in the shank, the compressed air can be released from here even if the compressed air is fed when the piston is lowered to the bottom of the cylinder chamber.

  Further, after the piston is pushed down by the compressed air, the second chamber can be returned to the normal pressure. (4) Since a check valve is provided in the oil passage of the tap collet that opens when the pressure exceeds a predetermined pressure, the tapping oil can be prevented from leaking even when the tap holder is directed downward.

  Tapping oil is filled by removing the tap collet and installing an oil filling tool instead, and supplying the tapping oil to the second chamber of the cylinder chamber through the first oil passage at the bottom of the tap holder without the check valve. Therefore, it is not necessary to provide a dedicated oil filling passage in the tap holder body.

It is sectional drawing of the tap holder by this invention. It is a perspective view of a piston. It is explanatory drawing which shows the state which removed the tap collet. It is explanatory drawing of an oil filling tool.

  Hereinafter, the tap holder of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of a tap holder according to the present invention. As shown in FIG. 1, the tap holder 100 includes a tap holder body 1 and a tap collet 2. A tap 3 is attached to the tap collet 2. The tap holder body 1 is provided with a shank 1a attached to the main shaft of the machine tool on the upper side. A cylinder chamber 5 is provided in the hollow portion of the tap holder body 1. The cylinder chamber 5 is provided with a piston 6 and divides the cylinder chamber 5 into a first chamber 5a into which compressed air enters and a second chamber 5b in which tapping oil 4 is filled in advance. The compressed air 8 sent from the machine tool side enters the first chamber 5a of the cylinder chamber 5 through the air passage 10 provided in the shaft core of the shank 1a. The piston 6 is driven by the compressed air 8 and moves downward. As shown in FIG. 1, an escape passage 11 is provided in a direction crossing the air passage 10. One end of the escape passage 11 is opened to the atmosphere from the recess of the shank 1a. Therefore, a part of the compressed air 8 that has been sent escapes from here, and after a certain period of time, the interior of the first chamber 5a returns to atmospheric pressure. If the compressed air 8 is sent while the piston 6 is pushed down, the piston 6 does not move, and the compressed air 8 escapes from the passage 11. The escape passage 11 is also useful for moving the piston 6 to the original position when the tapping oil 4 is filled.

  The tapping oil 4 filled in the second chamber 5 b of the cylinder chamber 5 passes through the oil passage 12 and exits to the injection port 14 of the bush 13 provided at the lower end of the tap collet 2. By moving the piston 6 with a predetermined amount of compressed air from the machine tool side, the tapping oil 4 can be injected around the tap 3. As a result, the tapping oil 4 can be applied to the tap 3 and can also be supplied to a tap hole (not shown) immediately below the tap 3.

  The oil passage 12 includes, from above, a first oil passage 12a provided in the bottom of the tap holder body, a second oil passage 12b provided in the tap collet, a third oil passage 12c formed in the tap collet 2, and a tap. It consists of a fourth oil passage 12d that is mounted on the collet and formed in a bush 13 that grips the tap 3. The first oil passage 12a and the second oil passage 12b are pipe passages passing through the shaft core, and the third oil passage 12c and the fourth oil passage 12d are passages of holes formed therein. The third oil passage 12c, the fourth oil passage 12d, and the injection ports 14 of the bush 13 are provided in a plurality in the circumferential direction.

  A check valve 9 is provided at the upper end of the second oil passage 12b. The check valve 9 opens when the tapping oil 4 is increased to a predetermined pressure or higher by the compressed air 8. Thereby, the tapping oil 4 reaches the first oil passage 12a of the tap holder body 1 from the second chamber 5b of the cylinder chamber 5, but is blocked by the check valve 9 and does not leak from the injection port 14. . The viscosity of the tapping oil 4 is 100 to 200 cSt (centistokes). The check valve 9 is effective for oil leakage when the viscosity of the tapping oil 4 is low or when the ambient temperature is high and the viscosity decreases.

  The volume of the second chamber 5b of the cylinder chamber 5 can be set to 200 cc, for example. In this case, if the injection is set to 0.25 cc per one time, 800 injections can be performed. For example, if injection is performed once per hour, if the tapping oil 4 is filled into the second chamber 5b of the cylinder chamber 5 once, it will take 800 hours. As shown in FIG. 1, the tap collet 2 can be attached to and detached from the tap holder body 1 with one touch. When filling the tapping oil 4, the tap collet 2 is removed from the holder body 1b. In addition, although the injection time of the compressed air 8 is several seconds, the time is set by the control on the machine tool side.

  FIG. 2 is a perspective view of the piston 6. The piston 6 is provided with a recess 6 a on the second chamber 5 b side of the cylinder chamber 5. The recessed part 6a can enlarge the 2nd chamber 5b and can increase the filling amount of the tapping oil 4 compared with the case where this is not provided.

  FIG. 3 is an explanatory view showing a state where the tap collet is removed. As shown in FIG. 3, since the check valve 9 is installed inside the tap collet 2, specifically, at the upper end of the second oil passage 12 b, when the tap collet 2 is removed from the tap holder body 1, The first oil passage 12 a can be used as an inlet for the tapping oil 4. The tap holder 100 is in a state in which, for example, the tap holder body 1 is mounted on a machine tool. In this case, the tip of the air passage 10 is blocked by the compressed air supply source of the machine tool. However, if the tapping oil 4 is pressed into the second chamber 5b of the cylinder chamber 5, the air in the first chamber 5a is released. Escape to the outside through the passage 11, the piston 6 moves in the direction of the shank 1 a, and the tapping oil 4 can be filled.

  FIG. 4 is an explanatory diagram of the oil filling tool 15. The oil filling tool 15 includes an insertion portion 15b, a cylinder portion 15c, and a handle piston portion 15d. There is a discharge port 15a at the tip of the insertion portion 15b. It is assumed that the tapping oil 4 is accommodated in the cylinder portion 15c. When the piston part 15d with handle is pushed, the discharge valve 15e is opened by pressure, and the tapping oil 4 is discharged from the discharge port 15a. As shown in FIG. 4, the shape of the insertion portion 15 b is matched to the shape of the tap collet 2. Therefore, the insertion part 15b of the oil filling tool 15 can be attached to the tap holder body 1 from which the tap collet 2 shown in FIG. 3 is removed. One end of the first oil passage 12 a is fitted as a male connection port and the discharge port 15 a as a female connection port, and the tapping oil 4 can be filled into the second chamber 5 b of the cylinder chamber 5 of the tap holder body 1.

  The present invention is suitable as a tap holder that can apply tapping oil to a tap using compressed air of a machine tool.

DESCRIPTION OF SYMBOLS 1 Tap holder main body 1a Shank 2 Tap collet 3 Tap 4 Tapping oil 5 Cylinder chamber 5a 1st chamber 5b 2nd chamber 6 Piston 6a Recessed part 8 Compressed air 9 Check valve 10 Air passage 11 Escape passage 12 Oil passage 12a 1st oil passage 12b 2nd oil passage 12c 3rd oil passage 12d 4th oil passage 13 Bush 14 Injection port 15 Oil filling tool 15a Discharge port 15b Insertion part 15c Cylinder part 15d Piston part with handle 15e Discharge valve 100 Tap holder

Claims (2)

A holder body having a shank attached to the spindle of the machine tool;
A tap collet that is detachably fitted to the holder body;
A cylinder chamber provided in a hollow portion of the holder body;
A piston mounted in the cylinder chamber and located on the shank side and containing compressed air; and a piston that divides the cylinder chamber into a second chamber located on the tap collet side and prefilled with tapping oil;
An air passage that is provided in the shank and guides compressed air that drives the piston to the first chamber;
An escape passage provided in the shank for escaping compressed air to the outside;
An oil passage for guiding the tapping oil of the second chamber to an injection port provided at a lower end of the tap collet;
A check valve provided in the oil passage of the tap collet and opened when the tapping oil reaches a predetermined pressure or more,
When a predetermined amount of compressed air is supplied from the machine tool to the first chamber, the piston is lowered to open a check valve, and tapping oil is injected from the injection port around the tap. Tapping holder.
  The oil passage includes a first oil passage provided in a bottom portion of the tap holder body and a second oil passage provided in the tap collet. When the tapping oil in the cylinder chamber is used up, the tap holder The tap collet is removed from the main body, and tapping oil is supplied to the second chamber of the cylinder chamber from the oil filling tool attached instead of the tap collet via the first oil passage. Item 2. The tap holder according to item 1.

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