JPH0947934A - Holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the accuracy in the working dimensions of a workpiece by providing the working face with an adjusting means for making the axial line of the tool fitted to a tool-fitting part coincide with the axial line of the main spindle. SOLUTION: A tool 8 is fitted to the tool-fitting part 7 of a body 6. In this condition, the axial line 7a of the tool-fitting part 7 coincides with the axial line 8a of the tool 8. Then, the centering member 16 of a holder B is fitted to the fitting part 4 of a main spindle A, and the working face 15 is abutted on the end surface 2, and the holder B is tightly connected to the main spindle A by means of a plurality of set screws 14. In the connected condition, if there is an inclination of the axial line 8a of the tool 8 to the axial line 1a of the main spindle A, the axial line 8a is made to coincide with the axial line 1a by the adjustment of an adjusting means 17. When the holder B is connected to the main spindle A, and also the axial line 8a coincides with the axial line 1a, the main spindle A is turned, and the working of a workpiece by means of the tool 8 is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holder used for attaching a cutting tool such as a drill or an end mill for machining to a spindle of a machine tool.

[0002]

2. Description of the Related Art As a holder of this type, the other end of a main body having a tool mounting portion at one end is provided with an abutting surface for contacting an end face of a main shaft of a machine tool, and the main body has an end face of the main shaft. In addition, there is a holder provided with a connecting tool for connecting the main body to the main shaft in a state where the contact surface is in contact with the main body. Since such a holder is attached by abutting the abutting surface against the end surface, in the attached state, the holder has increased resistance to lateral force applied thereto, and when performing cutting by rotating the main shaft, It is possible to prevent the tool from laterally sticking due to a lateral force applied to the tool from the workpiece, and to improve the texture of the processed surface of the workpiece.

[0003]

However, in this conventional holder, when the end face of the main shaft is misaligned, for example, when the squareness of the end face with respect to the axis of the main shaft is misaligned, the main shaft is mounted in the above-mentioned mounted state. The axis line of the tool is inclined with respect to the axis line, and as a result, the tool is deviated during the above-mentioned processing, and there is a problem that the processing dimensional accuracy of the workpiece is reduced and the life of the tool is shortened.

The holder of the present invention is provided to solve the above-mentioned problems (technical problems) of the prior art. The first purpose is to prevent the tool from sticking during the machining of the work piece by enabling the machine tool to be attached to the spindle so as to be in contact with the end surface of the machine tool. It is to make the surface skin good. The second purpose is to improve the machining dimensional accuracy of the work piece by making the axis line of the tool coincide with the axis line of the main shaft even if the end face of the main shaft is misaligned, and shorten the life of the tool. It is to be able to use it for a long time. Other objects and advantages will be more readily apparent from the drawings and the following description associated therewith.

[0005]

In order to achieve the above object, in the holder of the present invention, the other end of the main body having the tool mounting portion at one end is brought into contact with the end surface of the spindle of the machine tool. A holder provided with a contact surface for connecting the main body to the main shaft in a state where the main surface is brought into contact with the end surface of the main shaft, The adjusting means is provided for aligning the axis of the tool attached to the section with the axis of the main shaft.

[0006]

[Operation] Attach the tool to the tool mounting part. The contact surface is brought into contact with the end surface of the main shaft, and in this state, the holder is connected to the main shaft by the connecting member. This attaches the tool to the spindle. If the axis of the tool is inclined with respect to the axis of the spindle in the attached state, the axis of the tool is made to coincide with the axis of the spindle by the adjusting means for the time being. When the work piece is machined with the tool by rotating the main shaft, the abutment of the abutting surface against the end face prevents the tool from laterally sticking due to a lateral force applied to the tool from the work piece.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 4, A is a well-known structure of a spindle of a machine tool, 2 is an end face for receiving a holder,
According to the standard, it is formed perpendicular to the axis line 1a of the main axis A. Reference numeral 3 indicates a screw hole for fixing the holder, and reference numeral 4 indicates a fitting portion for centering the holder. Next, B shows a holder used for attaching a tool to the spindle A. Reference numeral 6 denotes a main body that constitutes the main body of the holder B. Reference numeral 7 denotes a tool mounting portion provided at one end of the main body 6, and illustrates a tapered hole which is mounted by driving a mounting tapered portion 9 of a tool 8 (for example, a drill). The tool may be detachably attached. Reference numeral 11 denotes a flange portion for attaching to the main shaft A in the main body 6, and has a plurality of through holes 12 for attachment. 13 in the through hole 12 indicates a step for engaging the head of the bolt. Reference numeral 14 is a fastening bolt exemplified as a connecting tool attached to the main body 6 for connecting the main body 6 to the main shaft A. A reference numeral 15 is a surface provided on the other end of the main body 6 for contacting the end surface 2 of the spindle A. Applicable surface
15 and the axis 7a of the tool mounting portion 7 are formed perpendicularly. Reference numeral 16 denotes a centering member connected to the other end of the main body 6 for centering the holder B with respect to the main shaft A, and is formed in a size that fits snugly into the fitting portion 4. .

Reference numeral 17 denotes an adjusting means provided on the abutting surface 15 for aligning the axis 8a of the tool 8 mounted on the tool mounting portion 7 with the axis 1a of the spindle, and mounting the holder B on the spindle A. In this state, by changing the inclination of the axis 7a of the tool mounting portion 7 with respect to the axis 1a of the spindle A, the axis 8a is made to coincide with the axis 1a of the spindle. The adjusting means 17 is composed of adjusting elements 17a provided at a plurality of locations around the axis 7a so that the inclination of the axis 7a can be changed in any direction. The plurality of adjusting elements 17a are provided at, for example, a plurality of locations between the attachment points of the coupling tool 14, but may be provided at other locations. Each regulatory element
17a will be described. Reference numeral 18 denotes a bulging thin-walled portion for allowing a portion 15a of the abutting surface 15 to bulge, and is formed by omitting a portion 19 inside the collar portion 11. Reference numeral 20 is a screw hole exemplified as a mounting portion of an operation member for adjustment operation, and 21 is a push screw exemplified as an operation member for adjustment, which is screwed into the screw hole 20.

Next, the attachment of the tool 8 to the spindle A using the holder B having the above-mentioned structure is as follows. First, the tool 8 is attached to the tool attaching portion 7 of the main body 6. In this mounted state, the axis line 7a of the tool mounting portion 7 and the axis line 8a of the tool 8 coincide with each other. Next, the centering member 16 of the holder B is fitted to the fitting portion 4 of the spindle A, the abutting surface 15 is brought into contact with the end surface 2, and the holder B is firmly coupled to the spindle A with a plurality of fastening bolts 14. .

In the above-mentioned coupled state, the presence or absence of inclination of the axis 8a of the tool 8 with respect to the axis 1a of the spindle A is checked. The operation may be performed, for example, by rotating the spindle A and checking the swing of the center 8b of the tip of the tool 8. The center 8b of the tip of the tool 8 from the above 15
Is about 100 mm, for example, and the degree of uneven distribution D of the center 8b of the tip from the axis 1a is, for example, about 1/100 mm (in FIG. 1, it is drawn larger than the actual size to show the uneven distribution). ). When the above inclination exists, the axis 8a is aligned with the axis 1a by adjusting the adjusting means 17. The operation is as follows. For example, the adjusting element 17a on the side where the axis 8a is inclined is operated. That is, the push screw 21 is rotated to deform the thin portion 18 as shown in FIGS. 2 and 4, and the part 15a of the immediate surface is bulged. Due to this bulging, the main body 6 is slightly deformed, the inclination of the axis 7a of the tool mounting portion 7 with respect to the end surface 2 of the main spindle A changes, and the axis 7a of the tool mounting portion 7 moves toward the axis 1a side. Then, the axis 8a moves to the side of the axis 1a. As for the operation amount of the push screw 21, the above axis 8a is the axis 1a
You can do it until In the case of the above inclination correction operation, the thin portion 18 functions as a protective member for preventing damage to the end surface 2. That is, since the tip of the push screw 21 is covered with the thin portion 18, the tip pushes the end surface 2 through the thin portion 18. Therefore, the tip of the push screw 21 is prevented from directly contacting the end face 2 and damaging it. In the case of correcting the inclination, the place where the adjusting operation of the adjusting element 17a is performed is not limited to the place on the side described above, and it may be better to perform it in another place. In some cases, it may be better to perform at multiple locations.

When the holder B is connected to the spindle A and the axis 8a is aligned with the axis 1a as described above, the spindle A is rotated to machine the workpiece with the tool 8. .

Next, a different aspect will be described. The above-mentioned inclination correction operation is performed by using a fixing bolt near the adjusting element 17a to be operated.
It is also possible to carry out with 14 loosened a little and refasten the loosened fastening bolt 14 after the correction operation is completed. Next, the adjusting means
17 may include only one adjusting element 17a. In that case, the mounting direction of the holder B with respect to the spindle A is changed around the axis 1a of the spindle so that the adjusting element 17a comes to the side where the axis 8a is inclined, and in that state, the holder B with respect to the spindle A is changed. And then adjust the adjustment element 17
The operation of a may be performed. Next, when the push screw 21 of the adjusting element 17 is made of a material or a shape that is unlikely to scratch the end face 2 in relation to the end face 2, the tip of the push screw 21 should directly contact the end face 2. It may be.

[0013]

As described above, according to the present invention, when the tool 8 is attached to the spindle A of the machine tool, the holding tool B with the tool 8 attached to the tool attaching portion 7 is used for the time being 15
Is attached to the end face 2 of the spindle A, the holding tool B has increased resistance to the lateral force applied to the holder B in the attached state, and when the spindle A is rotated to perform cutting, It is possible to prevent the tool 8 from laterally sticking due to a lateral force applied to the tool 8 from the object, and to improve the texture of the processed surface of the workpiece. Moreover, even if the abutting surface 15 is brought into contact with the end surface 2 of the main spindle A as described above, the end surface 2 of the main spindle A is deformed and the main spindle A is attached to the main spindle A in a mounted state. When the axis 8a of the tool 8 is inclined with respect to the axis 1a of A, the axis 8a of the tool 8 is made to coincide with the axis 1a of the spindle A by adjusting the adjusting means 17 provided on the contact surface 15. There is a feature that can be. This means that when the spindle A is rotated and the machining is performed by the tool 8 as described above,
There is an advantage that the machining dimensional accuracy of the work piece can be made high and the long life of the tool can be utilized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of attachment to a spindle (I- in FIG. 3).
(I line sectional view).

FIG. 2 is a cross-sectional view showing a state in which the inclination of the tool is corrected.

FIG. 3 is a front view of a holder.

FIG. 4 is a view on arrow IV in FIG.

[Explanation of symbols]

 A Spindle 2 End face 6 Main body 7 Tool mounting part 8 Tool 15 For the time being 17 Adjustment means

Claims (1)

[Claims] 1. A contact surface for contacting an end surface of a main shaft of a machine tool is provided at the other end of a main body having a tool attachment portion at one end, and the main surface is contacted with the contact surface. In a holding tool provided with a coupling tool for coupling the main body to the main spindle in the closed state, the adjusting means for aligning the axis line of the tool attached to the tool mounting part with the axis line of the main spindle at the present surface. A holder characterized by being provided with.