JP5411035B2 - Processing tool positioning jig - Google Patents

Description

  The present invention relates to a positioning jig for positioning a processing tool used in a machine tool at a required processing position.

  In a machine tool such as a lathe, a workpiece (also referred to as a “workpiece”) is gripped by a rotary shaft such as a main shaft and processed with a processing tool such as a cutter or a cutting tool. At that time, the reference surface of the processing tool must be accurately positioned (also referred to as “centering”) with respect to the axis of the rotary shaft that holds the workpiece.

  In order to facilitate the positioning operation of such a processing tool, for example, Patent Document 1 discloses that a reference shaft is provided on a hollow cylindrical tube body fitted to a holding shaft (rotating shaft) that holds a workpiece. There is disclosed a centering device that is rotatably held, has an operating handle attached to one end of the reference shaft, and has a flat surface including the center of rotation of the holding shaft at the other end.

  When using this centering device to center the cutting tool as a processing tool, the centering device is fitted to the chuck of the holding shaft of the processing device, and the handle protrudes from the rear end of the chuck. The flat surface protrudes from the front end of the chuck. Then, the tool attached to the tool post is brought close to the flat surface, the reference shaft is slightly rotated by the handle, and the position of the tool is adjusted so that the play is minimized.

Japanese Utility Model Publication No. 2-47105

  However, since this centering device has a mechanism for holding the reference shaft in a freely rotatable manner, the number of parts is high and the cost is high, and there is a possibility that backlash occurs between the parts and the positioning accuracy is lowered. Furthermore, there is a problem that it is not easy to cope with a plurality of machining tools having different positioning positions with respect to the axis of the rotary shaft.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a machining tool positioning jig having a simple configuration capable of dealing with a plurality of machining tools having different positioning positions.

In order to achieve the above object, a jig for positioning a machining tool according to the present invention is integrally formed with a mounting portion that is mounted on the machine tool side and supported so as to be freely rotatable on one end side of a cylindrical main body. For the positioning of the machining tool, the abutting part that abuts the reference surface of the machining tool of the machine tool is integrally formed on the end side, and rotates by the contact of the reference surface and the abutting part to position the machining tool. It is a jig.
The mounting portion is formed so that when mounted on the machine tool side, the axis of the main shaft that grips the workpiece of the machine tool and the center axis of the main body coincide with each other. A plurality of planar contact surfaces that are parallel to the central axis of the main body and have different distances from the central axis are formed in a stepped manner on the contact portion.

The mounting portion may be formed so as to be integrally held by a rotation shaft provided on the machine tool side so as to be freely rotatable. Conveniently, the axis of rotation is the main axis of the machine tool.
More preferably, the mounting portion is formed in a plurality of stages.
Further, the size of each step of the mounting portion and the contact surfaces are set so that the contact surfaces of the contact portions position the processing tools corresponding to the plurality of workpieces gripped by the spindle. It is desirable that the distance from the central axis corresponds to a pair.

  If the jig for positioning a processing tool according to the present invention is used, the mounting portion is mounted on the machine tool side and supported so as to be freely rotatable, thereby matching the central axis of the main body with the axis of the main shaft, The reference surface of the tool is brought into contact with the contact surface corresponding to the processing tool among the plurality of contact surfaces of the contact portion, and the contact surface and the reference surface of the processing tool are in surface contact with each other. By freely rotating the entire positioning jig including the contact portion, the machining tool can be easily positioned with respect to the axis of the spindle.

  Since the mounting tool and the abutting part are formed integrally with the main body, the processing tool positioning jig can be manufactured with high accuracy and low cost without the need for assembly, and the durability can be improved. In addition, a plurality of machining tools having different positioning positions can be positioned by a single positioning jig by bringing the reference surfaces of the corresponding machining tools into contact with the plurality of contact surfaces formed in steps. Therefore, it is not necessary to frequently replace the positioning jig, and various processing tools can be positioned easily.

  In addition, by forming the mounting portion so as to be gripped integrally with a rotating shaft provided on the machine tool side so as to freely rotate, the positioning jig can be used by using a rotating mechanism on the rotating shaft side. , And can be easily rotated integrally with the rotating shaft. The rotating shaft can be the main axis of a machine tool.For example, before the workpiece is gripped by the main shaft, the positioning jig is attached to the main shaft, or the processing of the workpiece on the front main shaft is completed. After the workpiece is transferred to the back spindle, the positioning jig axis and the spindle for gripping the workpiece and the back spindle axis can be easily obtained by attaching the positioning jig to the spindle. The machining tool can be easily positioned.

If the mounting part is formed in a plurality of stages, for example, by forming a plurality of cylindrical gripping parts having different diameters, any of the stages may be selected according to the chuck of the rotating shaft such as the spindle of a machine tool. It is possible to easily mount the positioning jig on the machine tool side. In particular, by using the rotating shaft as the main spindle of the machine tool, it is possible to easily position the processing tool by mounting this positioning jig corresponding to the various workpiece mounting portions of the main spindle that are exchanged according to the workpiece. be able to.
The size of each stage of the mounting portion and the main body of each contact surface so that each contact surface of the contact portion positions a processing tool corresponding to each of a plurality of workpieces gripped by the main shaft If the distance from the central axis of the pair is made to correspond to a pair, the processing tool can be easily positioned according to the diameter of the workpiece to be gripped and attached to the spindle of the machine tool.

It is a perspective view of one Example of the jig for positioning of the processing tool by this invention. It is a side view of the positioning jig. It is a perspective view which shows an example of the state which is positioning the processing tool using the positioning jig shown in FIG.1 and FIG.2. It is a side view which shows an example of the state which is similarly positioning the processing tool by making a main axis into a section. It is the principal part front view similarly. Using the positioning jig according to the present invention, the state in which the flat screw cutter with the smallest screw head diameter is positioned and the state in which the flat screw head is grooved are shown in cross section. FIG. Using the positioning jig according to the present invention, the state of positioning the flat screw cutter with a medium screw head diameter and the state of performing groove processing on the screw head of the flat screw in cross section of the main shaft FIG. Using the positioning jig according to the present invention, the state in which the flat screw cutter with the largest screw head diameter is positioned and the state in which the groove head is grooved in the flat screw are shown in cross section. FIG. It is a side view which shows the other example of use of the jig for positioning of the processing tool by this invention by making a rotating shaft into a cross section.

Hereinafter, embodiments for carrying out the present invention will be specifically described with reference to the drawings.
First, an embodiment of a processing tool positioning jig according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the positioning jig, and FIG. 2 is a side view.
The processing tool positioning jig 1 is mounted on the machine tool side by being mounted on one end side of a columnar body 10 by a freely rotating rotary shaft provided in the machine tool. A mounting portion 11 that is supported so as to be freely rotatable is integrally formed, and a contact portion 12 that is in contact with a reference surface of a processing tool positioned on the other end side is integrally formed. In this embodiment, the rotating shaft is, for example, a main shaft of a machine tool. In this case, the mounting portion 11 is mounted on the main shaft.

The mounting portion 11 is formed with a cylindrical holding portion concentric with the cylindrical main body 10. When the gripping portion is gripped by the main spindle of the machine tool, the axis of the main spindle coincides with the central axis C of the main body 10. In this embodiment, a plurality of cylindrical gripping portions 11a to 11d having different diameters (diameters) are formed in a step shape as the gripping portion. As clearly shown in FIG. 2, the diameters D <b> 1 to D <b> 4 of the gripping portions 11 a to 11 d become smaller as the distance from the main body 10 increases. Therefore, the magnitude relationship between the diameters D1 to D4 of the gripping portions 11a to 11d is as follows.
D1 <D2 <D3 <D4

Further, the contact portion 12 is parallel to the central axis C of the main body 10, and the distances from the central axis C are stepwise different, and a plurality of flat contact surfaces 12 a to 12 d parallel to each other are stepped. Is formed. As clearly shown in FIG. 2, the distances d1 to d4 from the central axis C of the contact surfaces 12a to 12d increase as the distance from the main body increases.
Therefore, the magnitude relationship of the distances d1 to d4 from the central axis C of the contact surfaces 12a to 12d is as follows.
d1 <d2 <d3 <d4

Next, an example of a process for positioning a machining tool in a machine tool using the machining tool positioning jig 1 will be described with reference to FIGS.
In this example, the machine tool is a lathe having a main shaft 2, and the main shaft 2 is a rotating shaft that is rotatably mounted on the main shaft 3 and is driven and rotated by a driving means such as a built-in motor (not shown). At the same time, when the power supply to the motor is cut off, it can rotate freely.

  The main shaft 2 is hollow (in the shape of a pipe), and as shown in FIG. 4, a chuck 21 for gripping a workpiece (workpiece) via a sleeve 22 is provided therein. In the illustrated example, the outer peripheral surface of the front end of the chuck 21 and the inner peripheral surface of the front end of the sleeve 22 are engaged by a conical slope, and the chuck 21 and the sleeve 22 are relatively moved in the direction along the main axis 2C. Thus, the workpiece 21 can be gripped by the chuck 21. Since various gripping mechanisms such as a general collet chuck mechanism are known, they are illustrated in a simplified manner and detailed description thereof is omitted.

When positioning the machining tool, the main shaft 2 is allowed to freely rotate by cutting off the power to the driving means (built-in motor or the like) of the main shaft 2.
Then, first, the mounting portion 11 of the positioning jig 1 is inserted into the inside from the tip of the main shaft 2, and the gripping portion having a diameter corresponding to the diameter of the chuck 21 among the gripping portions 11a to 11d is gripped. The jig 1 is attached to the main shaft 2. The central axis C of the main body 10 of the positioning jig 1 attached to the main shaft 2 coincides with the main shaft axis 2C as shown in FIG.

  At this time, any of the gripping portions 11a to 11d may be gripped. However, if the gripping portion having a diameter corresponding to the chuck used when gripping the workpiece to be processed is gripped, After the alignment, the workpiece can be gripped and the machining can be started without exchanging the chuck 21, and the working efficiency is good. In the illustrated example, the grip portion 11 d having the largest diameter is gripped by the chuck 21.

  In this example, the machining tool to be positioned is a disk-shaped cutter 5 for grooving, and the cutter 5 is fixed to the tip of a concentric mounting shaft 6. The position of the cutter 5 can be adjusted in the axial direction of the mounting shaft 6 by moving the mounting shaft 6 in the vertical direction in the figure with respect to the tool holding sleeve 7 provided on the machine tool side.

Therefore, the flat bottom surface 5a which is the reference surface of the cutter 5 and a predetermined contact surface (the contact surface 12d in the illustrated example) of the contact surfaces 12a to 12d of the contact portion 12 are opposed to each other. To place.
When the cutter 5 is lowered in the axial direction of the mounting shaft 6 and the bottom surface 5a is brought into contact with the predetermined contact surface 12d, the state shown in FIG. Thereafter, when the cutter 5 is lowered, the main shaft 2 freely rotates, so that the positioning jig 1 also freely rotates together with the main shaft axis 2 </ b> C and the central axis C of the main body 10 coincident with each other. Then, as shown in FIG. 5B, the position of the cutter 5 is adjusted so that the bottom surface 5a of the cutter 5 and the contact surface 12d of the positioning jig 1 come into surface contact with each other, and the rotation play of the spindle 2 is minimized. I do.

Thus, by bringing the contact surface 12d of the positioning jig 1 into contact with the bottom surface 5a of the cutter 5, the cutter 5 can be positioned with reference to the spindle axis 2C as shown in FIG. .
For example, as shown in FIG. 5, the contact surface 12d of the positioning jig 1 is positioned away from the main axis 2C by a length (t / 2) that is ½ of the width (thickness) t of the cutter 5. By forming, the center of the cutter 5 in the width direction can be made coincident with the main axis 2C.

  The contact surfaces 12a to 12d of the contact portion 12 of the positioning jig 1 are made to correspond to a plurality of cutters having different thicknesses, respectively, so that the main shaft axis 2C (= the central axis C of the main body 10) is 1 / of the width of each cutter. By forming it at a position separated by a length of 2, one positioning jig 1 can cope with a plurality of types of cutters, for example, centering the cutter in the width direction (matching with the main axis). The cutter can be easily positioned.

  Since this positioning jig 1 can integrally form the main body 10, the mounting portion 11, and the contact portion 12 with a rigid body such as metal, the mounting portion 11 and the contact portion 12 are formed with relatively high accuracy. Therefore, the positional accuracy of the contact surfaces 12a to 12d with respect to the spindle axis 2C is improved, and the positioning accuracy of the processing tool such as the cutter 5 is improved.

The free rotation mechanism of the spindle 1 can be used for rotation of the contact surface caused by contact between the reference surface of the processing tool such as the bottom surface of the cutter 5 and any of the contact surfaces 12a to 12d of the positioning jig 1. In addition, since it is not necessary to provide the rotating structure of the contact surface on the positioning jig 1 side, the configuration of the positioning jig is simple and the durability is improved.
Since the rotation structure of the contact surface is not provided on the positioning jig 1 side, the center axis C of the main body 10 that is the rotation axis of the contact surfaces 12a to 12d on the positioning jig 1 side and the main axis 2C are adjusted. Is no longer necessary.

The gripping portions 11a to 11d of the mounting portion 11 of the positioning jig 1 and the contact surfaces 12a to 12d of the contact portion 12 can be set to correspond to each other.
In this embodiment, the gripping portions 11a to 11d are formed so as to be gripped by chucks of different sizes, and the contact surfaces 12a to 12d are respectively gripped by the chucks of the sizes (workpieces ( It is formed so as to correspond to a cutter for forming a groove in the workpiece.

  For example, since the slot width size of the slotted flat screw varies depending on the diameter of the screw head, each grip formed on the mounting portion 11 of the positioning jig 1 according to each chuck that grips the screw head having a different diameter. Positioning jigs for determining the diameters of the portions 11a to 11d and determining the positions of the contact surfaces 12a to 12d of the contact portion 22 corresponding to the gripping portions on the basis of the widths of the slits formed on the screw heads. 1 can be configured.

6, 7, and 8, when the groove for forming a slit is formed on the screw heads of three types of flat screws having different screw head diameters using the positioning jig 1, An example is shown in which grooving is performed after each cutter 5A, 5B, 5C, which is a machining tool for grooving with a width corresponding to the screw head, is positioned. In these drawings, portions corresponding to those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.
Of the three types of flat screws, the flat screw with the smallest screw head diameter is W1, the flat screw with the middle screw head diameter is W2, and the flat screw with the largest screw head diameter is W3. To do.

When slitting into three types of flat screws W1, W2, and W3 having different screw head diameters, as shown in FIGS. 6, 7, and 8A, each flat screw W1, W2, The chuck 21a, 21b, 21c that grips the screw head of W3 is replaced and attached to the main shaft 2, the gripping portions 11a, 11b, 11c corresponding to the chucks 21a, 21b, 21c are gripped, and the positioning jig 1 is main shaft. Attach to 2.
Then, the bottom surfaces of the cutters 5a, 5b, 5c having blade thicknesses corresponding to the flat screws W1, W2, W3 are respectively connected to the contact surfaces 12a of the positioning jig 1 as shown in FIG. , 12b, 12c can be positioned so that the centers in the thickness direction of the respective cutters 5A, 5B, 5C coincide with the spindle axis 2C.

Thereafter, the positioning jig 1 is removed from the main shaft 2, and the screw heads of the flat screws W1, W2, and W3 are moved by the chucks 21a, 21b, and 21c as shown in FIG. 6, FIG. 7, and FIG. By gripping, the positioning from the cutters 5a, 5b, 5c to the groove machining on the screw heads of the flat screws W1, W2, W3 can be performed easily and continuously.
At the time of grooving, the rotation of the main shaft 2 is fixed, and the cutter 5a, 5b, 5c is moved linearly in the grooving direction while rotating.

Thus, even when the size of the workpiece is changed, the cutters 5A, 5B, and 5C having different blade thicknesses can be easily and continuously positioned by the same positioning jig 1.
In this embodiment, the gripping portions 11a, 11b, 11c, and 11d of the mounting portion 11 of the positioning jig 1 are arranged so as to correspond to workpieces (chucks) having a diameter that increases from the end toward the main body 10 side. The contact surfaces 22a, 22b, 22c, and 22d of the contact portion 22 are arranged so as to correspond to workpieces (chucks) having a diameter that increases in order from the main body 10 toward the end.

Further, the lengths of the contact surfaces 12a, 12b, 12c, 12d of the contact portion 12 in the direction along the central axis C of the main body 10 and the gripping portions 11a, 11b, 11c, 11d corresponding to the contact surfaces. The length in the direction along the central axis C is the same.
Accordingly, when the cutter 5 is positioned on any of the contact surfaces 12a, 12b, 12c, and 12d, the spindle 1 is positioned at the same position with respect to the sleeve 7 shown in FIGS. 3 and 4, respectively. 5 positioning operations can be performed. Therefore, the cutter positioning operation can be easily performed.

  Here, another example of use of the processing tool positioning jig according to the present invention will be described with reference to FIG. In this example, in addition to the front main shaft 9 similar to the main shaft 2 described above, a flat screw is formed from a round bar-shaped workpiece W by a machine tool including a rear main shaft 8 whose axis coincides with and is opposed to the front main shaft 9. It is an example in the case of manufacturing. Similarly to the front spindle 9, the back spindle 8 is a rotary shaft that is rotatably mounted on the back spindle base, and is driven and rotated by a driving means such as a built-in motor, and power supply to the motor is cut off. And free rotation.

  Therefore, as shown in FIG. 9A, the chuck 91 of the front main shaft 9 is made to grip the round bar-shaped workpiece W so that the processed portion protrudes from the front end of the front main shaft 9, and the front main shaft 9 The machined part is cut with a cutting tool such as a cutting tool while rotating the intermediate diameter part a and the small diameter part b, and the small diameter part b is threaded. The medium diameter portion a is gripped by the chuck 81 of the back spindle 8 and the position indicated by the two-dot chain line is cut off in the direction of arrow A with a cutting tool such as a cutting tool to form a flat screw workpiece W4. To do.

Thereafter, the rear spindle 8 is moved backward while holding the workpiece W4.
Then, the front spindle 9 is in a freely rotatable state, and as shown in FIG. 9B, the chuck 91 has a predetermined gripping portion (in this example, a gripping portion) of the mounting portion 11 of the positioning jig 1 described above. 11b) is held, and the positioning jig 1 is mounted on the front main shaft 9. As a result, the positioning jig 1 is mounted such that the central axis C of the main body 10 and the main axis of the back main shaft 8 that holds the workpiece W4 coincide with each other.
Then, the grooving cutter 5 is lowered in the axial direction of the mounting shaft 6, and the lower surface 5a, which is the reference surface, is brought into surface contact with a predetermined contact surface (the contact surface 12b in this example) of the contact portion 11. Let it be positioned.

Thereafter, as shown in FIG. 9C, the cutter 5 is linearly moved in the grooving direction while rotating, and a slot is formed by grooving the head W4a of the workpiece W4 gripped by the back spindle 9. And complete the flat screw.
In this way, the positioning jig 1 is mounted on one main shaft obtained by primary processing of the workpiece, the processing tool is positioned, the other main shaft holding the primary processed workpiece, and the positioned processing tool. If the secondary processing is performed, the processing steps can be carried out continuously and efficiently.
In this case, similarly to the above-described embodiment, the machining tool can be positioned in accordance with the size of the chuck 91 of the front spindle 9 (the size of the material to be gripped), and the size of the chuck 81 of the back spindle 8 can be determined. Can be set regardless of the size of the gripping portion of the positioning jig 1, so that it is possible to grip any position of the workpiece on the back spindle 8 side.

In the embodiment described above, an example in which the positioning tool according to the present invention is used for positioning when the processing tool is a disk-shaped cutter for grooving has been described. Similarly, the positioning jig according to the invention can be used for positioning the machining tool. In that case, the distance from the central axis C of each contact surface of the contact portion 12 is set so as to correspond to the processing tool to be positioned, and the diameter of each gripping portion of the mounting portion 11 is also rotated during processing. It may be set so as to correspond to the type of workpiece diameter gripped by the shaft chuck.

The positioning jig can be similarly used for various machine tools having a rotating shaft that can be driven and rotated freely by gripping a workpiece other than the main shaft.
In addition, by providing a rotating shaft concentric with the main shaft on the machine tool side and gripping the grip portion on the rotating shaft, the axis of the main shaft and the central axis C of the body 10 of the positioning jig 1 can be easily matched. Thus, the processing tool can be positioned. For example, by attaching this positioning jig to the back spindle that is arranged on the same axis line facing the spindle, even if the guide bush is arranged on the tip side of the spindle, the axis of the spindle and the positioning axis The processing tool can be positioned by easily matching the central axis C of the main body 10 of the jig 1.

  As shown in the above embodiment, in addition to mounting the gripping portion (mounting portion) integrally with a main shaft or a rotating shaft provided rotatably on the machine tool side, and supporting the gripping portion (mounting portion) so as to freely rotate. The mounting portion 11 of the positioning jig 1 can be freely attached to the machine tool side by, for example, inserting the mounting portion into the main shaft, the rotating shaft, or a fixed structure on the machine tool side so as to rotate freely. It can also be mounted rotatably. For example, the mounting portion 11 can be mounted by being rotatably inserted into the guide bush.

  The processing tool positioning jig according to the present invention can be used in various machine tools having a rotary shaft that can rotate and rotate freely by gripping a workpiece such as various lathes, and can position a processing tool such as a cutter. Can be done easily, accurately and efficiently.

1: Processing tool positioning jig 2: Spindle (rotating shaft) 2C: Spindle axis 3: Spindle base (fixed part of machine tool) 5,5A, 5B, 5C: Cutter (working tool)
6: mounting shaft 7: sleeve 8: back main shaft 9: front main shaft 10: main body 11: mounting portion 11a to 11d: gripping portion 12: contact portion 12a to 12d: contact surface 21: sleeve in main shaft 22: chuck 81 : Chuck of back spindle 91: chuck of front spindle C: center axis of main body W1, W2, D3: flat screw (workpiece, workpiece)
W: Round bar workpiece W4: Flat screw workpiece (workpiece)

Claims (5)

A mounting portion that is mounted on the machine tool side and supported so as to be freely rotatable is integrally formed on one end side of the cylindrical body, and a contact portion that contacts the reference surface of the processing tool of the machine tool on the other end side. Is a tool for positioning a processing tool that is formed integrally, rotates by contact between the reference surface and the contact portion, and positions the processing tool,
The mounting portion is formed so as to match the axis of the main shaft that grips the workpiece of the machine tool and the center axis of the main body when mounted on the machine tool side,
A plurality of planar contact surfaces that are parallel to the central axis of the main body and have different distances from the central axis are formed in a stepped manner on the contact portion, for positioning a machining tool, Jig.   The jig for positioning a machining tool according to claim 1, wherein the mounting portion is formed so as to be integrally held by a rotating shaft provided on the machine tool side so as to be freely rotatable.   3. The processing tool positioning jig according to claim 2, wherein the rotary shaft is a main shaft of a machine tool. In the processing tool positioning jig according to any one of claims 1 to 3,
A jig for positioning a processing tool, wherein the mounting portion is formed in a plurality of stages. In the processing tool positioning jig according to claim 4,
The size of each step of the mounting portion and the size of each contact surface are set so that each contact surface of the contact portion positions a processing tool corresponding to each of a plurality of workpieces gripped by the main shaft. A jig for positioning a machining tool, wherein the distance from the central axis is associated with a pair.

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