JP2005212087A - Tool holder for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable high-quality machining by preventing the backward displacement f1 of a tool 8 for the main body 1 of the holder, to stop the unnecessary leak of cutting liquid mist even if the tool 8 comparatively largely displaces toward the front f2 against the main body 1 of the holder, and to eliminate the use of a rubber packing. <P>SOLUTION: The tool holder has an elastic sealing cylinder member 6 densely fit on the periphery of a tool receiving member 5 so that the periphery of a round shaft e6 at the back end of the tool 8 densely fits in the front of the elastic sealing cylinder member 6 when the tool 8 is inserted in the front of a straight pathway a of the main body 1 of the holder, the back end e5 of the tool 8 abuts on a tool receiving member 5 and is received, and under this condition the pathway through-hole b4 of the tool receiving member 5 and the pathway through-holes e1 an e2 of the tool 8 are closely connected in the interior hole of the elastic sealing cylinder member 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tool holder for a machine tool in which cutting fluid mist is ejected from the tip of a tool.

  The rear part of the tool is inserted into the front part of the straight through hole formed at the center of rotation of the holder body, and the tool is received by a tool receiving member installed in the straight through hole, In addition to being engaged in a groove formed in the tool receiving member, a tongue portion forming a rear end portion of the tool is pressed against the bottom surface of the groove portion via a rubber packing, and the tool This part is fastened by a fastening means attached to the front end of the holder body and fixed to the holder body, and corresponds to the rotation center line portion of the tool receiving member. A passage through hole extending from the front end surface to the rear end surface is formed in the tool, and the former passage through hole and the latter passage through hole are formed in a dense shape via the rubber packing. Not communicated Machine tools for the tool holder is present (see Patent Document 1).

The tool holder is fixedly attached to the spindle of a machine tool when used, and a cutting fluid mist is supplied from the spindle to the inside of the holder body during processing of the workpiece. The cutting fluid mist supplied in this way is ejected from the tool through-hole of the tool receiving member and the tool through-hole of the tool, and lubricates the friction part between the tool and the workpiece.
JP 2001-287135 A

The conventional tool holder described above has the following problems.
That is, during the processing of the workpiece, an impact force toward the rear of the tool may be applied to the tool. In such a case, the tool resists the fastening force of the fastening means. The sliding displacement may occur rearward, resulting in a loss of processing accuracy, or the rubber packing being strongly pressed against the front end surface of the tool receiving member at the rear end surface of the tool and being damaged. become.

  In addition, the rubber packing is adhered to the front end surface of the tool receiving member with an adhesive to hold the position thereof. In addition to the time and effort required for the pasting operation, the adhesive with the rubber packing is used. It takes about one day to dry until the practical strength is expressed, making it difficult to quickly manufacture the tool holder.

  Further, when the tool is displaced to the front side and the rear end surface of the tool is separated from the rubber packing as much as possible, the cutting fluid mist supplied into the passage through hole of the tool receiving member is moved into the passage through hole of the tool. Without leaking into the tool, it leaks outward from the gap between the rear end surface of the tool and the rubber packing, which not only wastes the cutting fluid mist but also lubricates the machining location of the tool. It becomes impossible to perform accurately and processing quality deteriorates.

  An object of the present invention is to provide a tool holder for a machine tool that can reasonably cope with such problems.

  In order to achieve the above object, according to the first aspect of the present invention, the rear part of the tool is inserted into the front part of the straight through hole formed at the rotation center line of the holder body, and the rear end surface of the tool is the straight part. The tool is received by a tool receiving member provided in the through-hole, and the tool is fixed to the holder body by being fastened by a fastening means attached to the tip of the holder body in the middle of its length. In the machine tool tool holder configured as described above, an elastic seal cylinder member is closely fitted on the outer peripheral surface of the tool receiving member, and the tool is inserted into the front portion of the straight passage. When the outer peripheral surface of the rear end portion of the tool is tightly fitted on the front side of the elastic seal cylinder member and the rear end surface of the tool is in contact with and received by the tool receiving member, Under the condition, the tool receiving part A passage hole of the passage hole of the tool has been made the structure in communication with the sealed shape in the bore of said resilient tubular sealing member.

  According to the second aspect of the present invention, there is provided a tool in which a rear portion of a tool is inserted into a front portion of a straight through hole formed at a rotation center line portion of a holder body, and the tool is provided in the straight through hole. A tongue portion that is received by the receiving member and forms a rear end portion of the tool is engaged with a groove portion formed in the tool receiving member, and the tool is halfway along the length of the tool body. In a tool holder for a machine tool that is fixed to the holder body by being fastened by a fastening means attached to the elastic member, an elastic seal that is tightly fitted to the outer peripheral surface of the tool receiving member A cylindrical member, and when the tool is inserted into the front portion of the straight passage, the outer peripheral surface of the rear end portion of the tool is tightly fitted into the front side of the elastic seal cylindrical member, and The rear end surface of the tongue is the tool receiving member Under the state, the passage through hole of the tool receiving member and the passage through hole of the tool are in the inner hole of the elastic seal cylinder member. It is set as the structure connected by the airtight form.

The above invention is embodied as follows.
That is, as described in claim 3, the tool receiving member is an adjustment screw screwed into the female thread forming portion of the straight through hole so as to be adjustable in the front-rear position, and the adjustment screw is formed on the front end surface. A groove portion into which the tongue portion is engaged is provided, and the rear end surface of the tongue portion is in contact with and received by the bottom surface of the groove portion.

  According to a fourth aspect of the present invention, a concave portion is formed on the bottom surface of the groove portion to be covered with a rear end surface of the tongue portion, and the concave portion is formed with a passage through hole of the adjustment screw and a passage through hole of the tool. And in a sealed manner.

  Furthermore, as described in claim 5, the elastic seal cylinder member is formed of rubber or a resin material.

According to the present invention described above, the following effects can be obtained.
In other words, according to the first aspect, even if the tool has a tongue at the rear end, the rear end surface of the tool abuts against the tool receiving member and is received. Even if an impact force acting backwards acts on the tool during machining of the workpiece, the tool does not cause rearward displacement and can be processed accurately, and conventional rubber packing is not used. Therefore, the rubber packing is not damaged, and the rear end portion of the tool is tightly fitted in the front end portion of the elastic seal cylinder member fixed to the front end portion of the tool receiving member. Therefore, as long as this internal fitting state is maintained, the cutting fluid mist will not flow out of the holder body or the fastening means even if the tool is relatively displaced in the front-rear direction. Can prevent waste Together, it can be performed in a timely manner properly lubricated high-quality processing of the machining point of the tool.

  In addition, since the conventional rubber packing is not used, there is no need for time and effort to apply the rubber packing, or to dry the adhesive for applying the adhesive until its practical strength is obtained, which makes the production of the tool holder more efficient. Will be able to do it.

  According to the second aspect of the invention, in addition to the same effect as in the case of the invention of the first aspect, the following effect can be obtained, that is, the tongue portion of the tool is a tool. Because it is engaged in the groove of the receiving member, the relative rotation between the tool and the tool receiving member can be restricted, so surface contact between the rear end surface of the tongue and the bottom surface of the groove of the tool receiving member is stable. The cutting fluid mist that flows from the passage through hole of the tool receiving member to the passage through hole of the tool can effectively be prevented from leaking out through the surface contact portion. It becomes.

 According to the third aspect of the present invention, the longitudinal position of the tool relative to the holder body is adjusted by rotationally displacing the adjustment screw with respect to the holder body, and the relative relationship between the tool and the adjustment screw. Rotation can be restricted by the tongue of the tool and the groove of the adjustment screw. Therefore, even when the tool holder is mounted on the spindle of the machine tool, the fastening means is loosened and the tool is rotated. By applying an operating force and rotationally displacing the adjustment screw, the front / rear position of the tool relative to the holder body can be changed.

  According to the fourth aspect of the present invention, the cutting fluid mist supplied from the main spindle of the machine tool into the passage through hole of the adjusting screw passes through the recess covered by the rear end surface of the tongue portion, and the tool passage through hole is provided. In this case, since the recess is covered by the rear end surface of the tongue, the cutting fluid mist is prevented from leaking out of the recess, and the cutting fluid mist in the recess is elastic. Even if it leaks into the inner hole of the seal cylinder member, since the inside of the sealing elastic member is in a dense state, its outflow toward the outside is further prevented. Further, even if the rear end opening of the tool passage through hole is located radially away from the rotation center line of the holder body, the cutting fluid mist supplied into the adjustment screw passage through the hole of the tool passes through the recess. It will be supplied into the passage through hole without any trouble.

  According to the fifth aspect of the present invention, the elastic seal cylinder member has excellent wear resistance and mechanical strength, and the above-described benefits can be obtained effectively.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1 is a longitudinal sectional view of a tool holder for a machine tool according to one embodiment of the present invention, FIG. 2 is a sectional view showing a main part of the holder, and FIG. 3 is a perspective view of each part constituting the main part. 4 shows a tool receiving member (adjustment screw) forming a part of the main part, A is a front view, B is a side sectional view, and FIG. 5 is an elastic seal cylinder member forming a part of the main part. Indicated at A is a front view, B is a side sectional view, and FIG. 6 is a perspective view of a tool forming a part of the main part.

  As shown in FIGS. 1 and 2, the holder body 1 of the tool holder according to the present invention includes a front round shaft portion 1a, a flange portion 1b, and a tapered shank portion 1c. A through hole a is formed at the x rotation center line x of the holder body 1, and female screws a 1 and a 2 are formed at a midway position and a rear part of the inner peripheral surface of the through hole a. Reference numeral 2 denotes a collet portion inserted into the tapered hole a3 of the front round shaft portion 1a. Reference numeral 3 denotes a collet fastening means screwed to a male screw a4 formed on the outer periphery of the front round shaft portion 1a. , A ring-shaped round bar member 3b and a coupling ring member 3c. Reference numeral 4 denotes a pull stud screwed to the rear end of the taper shank portion 1c via a female screw a2.

  An adjustment screw 5 is a tool receiving member. As shown in FIGS. 3 and 4, a male screw b1 is formed on the outer peripheral surface of the center in the front-rear direction f, and the front-rear position of the female screw a1 is located in the middle in the length direction. It is screwed so that it can be changed and adjusted. The front outer peripheral part b2 of the adjusting screw 5 has a smaller diameter than the male screw b1 and is formed with an annular convex part b3 at the front end, and a cross section having a different diameter at the central part corresponding to the rotational center line x. A passage through-hole b4 is formed by connecting a plurality of circular straight holes in the front-rear direction. A groove b6 having a specific width is formed at a diameter portion of the front end surface b5 of the adjustment screw 5, and a bottom surface b7 of the groove b6 is a plane orthogonal to the rotation center line x. The bottom surface b7 is formed with a recess b8 that is relatively long in a direction orthogonal to the rotation center line x, and the front end of the passage through hole b4 is opened in the recess b8.

  Reference numeral 6 denotes an elastic sealing cylinder member formed of an elastic resin material such as rubber or a resin material, and as shown in FIGS. Is formed. The elastic seal cylinder member 6 has a rear portion p1 of the inner peripheral surface c1 engaged with a front outer peripheral portion b2 of the adjusting screw 5 in an outer fitting manner. At this time, a rear end surface c3 is a front outer peripheral portion of the adjusting screw 5. In the state where it abuts against the radial surface b9 at the rear end of b2, the annular recess c2 is fitted onto the annular projection b3, and the fitting between the annular recess c2 and the annular projection b3 is an adjustment screw. The elastic seal cylinder member 6 is prevented from coming out of the front outer peripheral part b2 of the No. 5 part.

  Reference numeral 7 denotes a cutting fluid communication pipe made of a straight pipe member. A front end d1 is inserted into the rear end of the vent hole b4 of the adjusting screw 5 in an airtight and rotationally displaceable manner, while the rear end d2 Is inserted into the front portion of the center hole 4a of the pull stud 4 in an airtight manner by an O-ring r. The cutting fluid communication pipe 7 has a straight inner hole d3, and a rear end portion of the inner hole d3 is a hexagonal hole d4.

  Reference numeral 8 denotes a tool, which is formed with two small-diameter passage through holes e1 and e2 that are relatively separated from each other in the radial direction as shown in FIGS. 2, 3, and 6, and a rear portion e3 of the tool 8 is a collet. It is inserted into the front part of the straight through hole a of the holder body 1 through the two central holes g1. A tongue e4 is formed at the rear end of the tool 8. The tongue e4 has its rear end surface e5 abutted against the bottom surface b7 of the groove b6 of the adjusting screw 5 to restrict displacement to the rear f1. At this time, the rear end surface e5 of the tongue portion e4 is a plane orthogonal to the rotation center line x. In this received state, the rear end round shaft portion e6 of the tool 8 is elastically sealed. The cylindrical member 6 is fitted into the front part p2 of the inner peripheral surface c1 in a dense manner without a gap.

  When the tool 8 is attached to the holder body 1, the nut 3a of the collet fastening means 3 is loosened to leave the collet 2 open, and the rear e3 of the tool 8 is inserted from the front side of the collet 2 to the center hole g1 of the collet 2. Is inserted into the straight through-hole a of the holder main body 1 and then a pressing force is applied to the tool 8 so that the rear end round shaft portion e6 is moved to the front portion p2 of the inner peripheral surface c1 of the elastic seal cylindrical member 6. And the angle around the rotation center line x of the tool 8 is changed as necessary, the tongue e4 is fitted into the groove b6 of the adjusting screw 5, and the rear end surface e5 of the tongue e4 is grooved. The base 6 is brought into close contact with the bottom b7 of b6, and then the nut 3a of the collet fastening means 3 is turned and the collet 2 is tightened while maintaining the corresponding contact state.

  As a result, the tool 8 is fastened and fixed to the holder body 1 via the collet 2, and the two passage through holes e1 and e2 of the tool 8 and the passage through hole b4 of the adjusting screw 5 are located behind the tongue portion e4. It is in a state where it is communicated in an airtight manner through a recess b8 covered in a sealed manner at the end surface e5, and the rear end round shaft portion e6 of the tool 8, the front outer peripheral portion b2 of the adjustment screw 5, and the space between them. The part is in a state of being substantially airtightly surrounded by the elastic seal cylinder member 6.

  On the other hand, when removing the tool 8 fixed to the holder body 1, first, the nut 3 a of the collet fastening means 3 is turned to loosen the collet 2, and then the front part e 7 of the tool 8 is held by hand and pulled to the front f 2. Thus, the rear end round shaft portion e6 of the tool 8 is extracted from the elastic seal cylinder member 6 and pulled out of the holder body 1 and the collet fastening means 3.

  When using the tool holder of the said Example, the taper shank part 1c is inserted in the taper hole of the spindle of a machining center, for example. In the inserted state, the tool holder is fixed to the main shaft via the pull stud 4 so as to be prevented from coming out. Under the fixed state, the tool holder is rotationally driven together with the main shaft and moved back and forth as necessary, and cutting fluid mist is supplied into the center hole 4a of the pull stud 4 from the main shaft side.

  When the tool 8 cuts the workpiece, the rotational driving force of the main shaft is transmitted to the tool 8, and the transmission is transmitted from the holder body 1 to the tool 8 mainly through the collet 2.

  Further, the tool 8 may be given a pressing force to the rear f1 that becomes excessive with respect to the fastening force by the collet fastening means 3 due to an impact generated when contacting the workpiece during processing. Even in such a case, the pressing force is reliably supported by the surface contact by the hard material between the rear end surface e5 of the tongue portion e4 of the tool 8 and the bottom surface b7 of the groove portion b6 of the adjusting screw 5, so that the tool 8 is attached to the holder body 1. On the other hand, there is no relative displacement to the rear f1.

  On the other hand, the cutting fluid mist supplied from the main shaft side into the center hole 4a of the pull stud 4 passes through the inner hole d3 of the cutting fluid communication tube 7, the passage through hole b4 of the adjusting screw 5, and the recess b8. Of the tool 8, and finally ejected from the two tip openings e8 of the tool 8 to lubricate the friction point between the tip of the tool 8 and the workpiece to be cut. To do.

  During this lubrication, the cutting fluid mist is in a positive pressure state at the connection portion between the tool 8 and the adjusting screw 5, that is, the inside of the recess portion b8 which is the inside of the contact portion between the rear end surface e5 of the tongue portion e4 and the bottom surface b7 of the groove portion b6. However, since the rear end face e5 of the tongue part e4 and the bottom face b7 of the groove part b6 are in contact with each other between the hard materials, the cutting fluid mist normally leaks from the corresponding contact point. Don't be. However, if dust is pinched between the rear end surface e5 of the tongue portion e4 and the bottom surface b7 of the groove portion b6, or if the tool 8 is tilted or slightly displaced forward for some reason, the recess portion b8. The inner cutting fluid mist leaks between the rear end surface e5 of the tongue portion e4 and the bottom surface b7 of the groove portion b6.

  The leaked cutting fluid mist reaches the inner peripheral surface c1 of the elastic seal cylinder member 6, and the front part p2 of the inner peripheral surface c1 of the elastic seal cylinder member 6 is the rear end round shaft of the tool 8. Since the portion e6 is tightly fitted and closed, and the rear portion p1 of the inner peripheral surface c1 is also closed by closely fitting the front outer peripheral portion b2 of the adjusting screw 5, the cutting fluid mist is It does not occur further and leaks out of the elastic seal cylinder member 6.

  When changing the amount of protrusion of the tool 8 from the holder body 1, the wrench is fitted to the hexagonal hole d4 of the rear end portion d2 of the cutting fluid communication pipe 7 through the inner hole 4a of the pull stud 4 or rotated. Alternatively, the adjustment screw 5 is rotationally displaced as necessary by holding the front portion e7 of the tool 8 with a hand while the collet fastening means 3 is loosened. The latter operation is advantageous because it is not necessary to remove the tool holder from the main shaft.

The above embodiment can be modified as follows.
That is, as shown in Japanese Patent Application Laid-Open No. 2001-287135, the adjustment screw 5 is transformed into a tool receiving member that cannot be rotationally displaced in the holder body 1 and can only be displaced forward and backward. A male screw body for restricting the front and rear positions of the tool receiving member 5 to be adjustable and screwed is screwed to the female screw a1, so that the cutting fluid communication pipe 7 can be relatively displaced in the passage through hole b4 of the tool receiving member 5. It becomes the composition made to communicate. In this way, the rotational force of the main shaft can be accurately transmitted to the tool 8 via the tool receiving member 5, and the tool 8 can be held in the holder body 1 even if the fastening force of the collet fastening means 3 is insufficient. However, idling does not occur.

  Further, instead of supplying the cutting fluid mist from the main shaft into the tool holder, it is also possible to supply a cutting fluid which is not mist-like, and this also provides the same benefits as in the case of the cutting fluid mist.

  Moreover, although the rear part e3 of the tool 8 of the embodiment is a straight shank, it may be a tapered shank. In this case, it is necessary to make the front part p2 of the inner peripheral surface c1 of the elastic seal cylinder member 6 into a tapered hole corresponding to the tapered shank.

  Furthermore, in the present embodiment, the tool 8 is provided with the tongue portion e4, but is not necessarily limited to this. For example, the rear end surface of the tool 8 without the tongue portion e4 is formed with the groove b6. The tool 8 is received by the front end surface b5 of the tool receiving member 5 and the rear portion e3 of the tool 8 is densely attached to the front portion p2 of the inner peripheral surface c1 of the elastic seal cylinder member 6 fitted on the tool receiving member 5. It may be fitted inside. At this time, the rear portion e3 of the tool 8 may be cylindrical or prismatic. However, the front part p2 of the inner peripheral surface c1 of the elastic seal cylinder member 6 must be adapted to the outer shape of the rear part e3.

It is a longitudinal cross-sectional view of the tool holder for machine tools which concerns on one Example of this invention. It is sectional drawing which shows the principal part of the said holder. It is a perspective view of each component which makes the said principal part. The tool receiving member (adjustment screw) which makes a part of the said principal part is shown, A is a front view, B is side sectional drawing. The elastic seal cylinder member which comprises a part of the said principal part is shown, A is a front view, B is side sectional drawing. It is a perspective view of the tool which makes a part of said principal part.

Explanation of symbols

1 Holder body 3 Fastening means 5 Tool receiving member (adjustment screw)
6 elastic seal cylinder member 8 tool a straight through hole a1 female screw b2 front outer peripheral surface b4 passage through hole b5 front end surface b6 groove b7 bottom b8 recess e1 passage through hole e2 passage through hole e3 rear e4 tongue part e5 rear end surface e6 Round shaft at rear end x Rotation center line

Claims (5)

  The rear part of the tool is inserted into the front part of the straight through hole formed at the rotation center line of the holder body, and the rear end surface of the tool is received by a tool receiving member provided in the straight through hole. A tool holder for a machine tool, wherein the tool is fixed to the holder body by being fastened by a fastening means attached to a tip portion of the holder body in the middle of the length thereof. An elastic seal cylinder member is tightly fitted to the outer peripheral surface of the receiving member, and when the tool is inserted into the front portion of the straight passage, the outer peripheral surface of the rear end portion of the tool is elastic. The tool is tightly fitted on the front side of the seal tube member and the rear end surface of the tool is in contact with and received by the tool receiving member. Under this state, the passage through hole of the tool receiving member and The passage through hole of the tool is elastic. Machine tool holder, characterized in configuration communicates sealingly with the bore of Lumpur tubular member.   The rear part of the tool is inserted into the front part of the straight through hole formed at the center of rotation of the holder body, and the tool is received by a tool receiving member provided in the straight through hole. In addition to being engaged in a groove formed in the tool receiving member, a tongue portion forming a rear end portion is fastened by fastening means attached to a front portion of the holder body in the middle of its length. In the machine tool tool holder adapted to be fixed to the holder body by the above, an elastic seal cylinder member closely fitted to the outer peripheral surface of the tool receiving member is provided, and the straight shape When the tool is inserted into the front part of the passage, the outer peripheral surface of the rear end part of the tool is tightly fitted into the front side of the elastic seal cylinder member, and the rear end face of the tongue part is received by the tool Abuts the bottom of the groove formed in the member Under the state, the passage through hole of the tool receiving member and the passage through hole of the tool are communicated in a sealed manner within the inner hole of the elastic seal cylinder member. Tool holder for machine tools.   The tool receiving member is an adjustment screw screwed into the female thread forming portion of the straight through hole so as to be adjustable in the front-rear position, and the adjustment screw has a groove portion into which the tongue portion is engaged at the front end surface, The tool holder for a machine tool according to claim 2, wherein a rear end surface of the tongue portion is in contact with and received by a bottom surface of the groove portion.   A concave portion covered with a rear end surface of the tongue portion is formed on the bottom surface, and the concave portion communicates the passage through hole of the adjustment screw and the passage through hole of the tool in a sealed manner. Item 2. A tool holder for a machine tool according to Item 2 or 3.   The tool holder for a machine tool according to claim 1, 2, 3, or 4, wherein the elastic seal cylinder member is formed of a urethane material.

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