JPH0531839U - Positioning block of non-rotating support member in tool holder - Google Patents

Abstract

(57) [Abstract] [Purpose] When the positioning pin receives a radial load due to thermal expansion of the non-rotating support member, the positioning pin is displaced following this and the positioning block is made as small as possible. It can be formed and can be used without problems in numerical control machine tools with automatic tool changer. [Structure] The block body 14a has a fitting hole portion 15 into which a positioning pin 8 on the tool holder 3 side is fitted, and the fitting hole portion 15 is located in the holder body 1 and in a radial direction with respect to the holder body 1. It is formed in a substantially elliptical shape that is an ellipse in the direction connecting to the positioning pin 8, and a part 16a of the hole wall 16 of the fitting hole portion 15 that forms the ellipse is linear.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention provides a tool holder for mounting a cutting tool on a spindle of a machine tool, in which a part or all of the holder body does not rotate together with the spindle and is supported in a non-rotating state, such as an outer casing. The present invention relates to a positioning block for positioning and locking a non-rotating support member on the machine body side of a machine tool.

[0002]

[Prior Art]

 As shown in FIG. 4, when the holder main body 1 of the tool holder 3 for the angle head is mounted on the spindle 2 of the machine tool for use, the cutting tool 4 at the tip of the holder body 1 is oriented at a required angle with respect to the spindle 2. The drive shaft 5 which is mounted in the open state and rotates the cutting tool 4 must be supported by a non-rotating support member 7 such as a casing via a bearing 6.

In order to support the non-rotating support member 7 in a non-rotating state, a positioning pin 8 is provided in a projecting manner in the radial direction of the non-rotating support member 7, and the positioning pin 8 is fitted and locked. A positioning block 9 is attached to an end surface of a machine body 10 which is a non-rotating part of a machine tool.

In this way, the shank portion 5a of the drive shaft 5 is mounted on the spindle 2 of the machine tool, and the non-rotational support member 7 has the positioning pin 8 protruding in the radial direction fitted to the positioning block 9. By being locked in the hole 11, the tool holder 3 supports the cutting tool 4 without shaking, and the cutting work can be performed at a required angle with respect to the spindle 2.

However, during its use, the non-rotating support member 7 undergoes a slight thermal expansion due to heat generation due to frictional resistance of the bearing 6 portion and the transmission gear 12 due to rotation of the drive shaft 5 or heat transfer from the cutting tool 4. Bending stress is applied between the holder body 1 supported by the spindle 2 and the positioning pin 8 held by the positioning block 9, and in this case, the positioning block 9 and the positioning pin 8 Since the fitting engagement portion of is weak, distortion occurs in the non-rotational supporting member 7 and the holder body 1 around this fitting hole portion 11, and this causes the cutting tool 4 which is at the required angle with respect to the spindle 2. However, there was a problem in that it was not possible to perform accurate cutting work due to displacement.

In order to avoid this, as shown in FIG. 5, the fitting hole portion 11 of the positioning block 9 is opened in the direction connecting the holder body 1 and the positioning pin 8 located in the radial direction with respect to the holder body 1. When the positioning pin 8 is formed in a groove shape and the positioning pin 8 is fitted and locked in the groove-shaped fitting hole portion 11, the positioning pin 8 is displaced following the thermal expansion of the non-rotational supporting member 7 as shown by the arrow. This prevents distortion from occurring in the non-rotating support member 7 or the holder body 1.

However, like a numerical control machine tool with an automatic tool changer (hereinafter referred to as a machine tool with ATC), a tool arm 3 is transferred by a robot arm (manipulator) between a magazine in which the tool holder 3 is housed and a machine tool with ATC. When doing so, it is necessary to avoid obstacles as much as possible during its transfer, but since the outer diameter of the positioning block 9 having the above-mentioned groove-shaped fitting hole portion 11 is large, the tool holder 3 by the manipulator is used. There was a situation in which the tool holder 3 collided with the positioning block 9 on the way of transfer and could not be used for this kind of ATC machine tool.

That is, in the positioning block 9 having the groove-like fitting hole portion 11 as shown in FIG. 6, the wall thickness L of the groove wall 13 must be made sufficiently large to withstand the load on the fitting hole portion 11. Therefore, the size of the tool holder 3 becomes large as a whole, which hinders the automatic exchange of the tool holder 3 as described above.

In this case, if the fitting hole portion 11 of the positioning block 9 is formed into a perfect circle as shown in FIG. 7, the fitting hole portion 11 is subjected to the entire circumference of the fitting hole portion 11 against an external load received by the fitting hole portion 11. Since the circumferential walls 13 of the tool 13 reinforce each other, even if the wall thickness L is thin, the wall is sufficiently durable and the size is small as a whole, and the positioning block 9 enters the transfer path of the automatic exchange of the tool holder 3. However, as described above, the positioning pin 8 is fitted and locked in close contact with the entire circumferential wall surface of the fitting hole portion 11. The positioning pin 8 follows the thermal expansion of the non-rotational support member 7 in the radial direction. There is no room to escape, which causes distortion in the non-rotating support member 7 or the holder main body 1 and it is difficult to perform accurate cutting work with the cutting tool 4.

[0010]

[Problems to be solved by the device]

 An object of the present invention is to propose a positioning block which solves the above problems, is as small as possible, and is capable of satisfactorily escaping the positioning pin 8 against an external load.

[0011]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a tool holder 3 mounted on a spindle 2 of a machine tool, in which a non-rotating support member 7 is attached to a non-rotating support member 7 according to claim 1. The positioning block 14 is mounted on the end surface of the machine tool 10 side of the machine tool for positioning in a non-rotating state, and the block body 14a has a fitting hole portion 15 into which the positioning pin 8 on the tool holder 3 side fits. The fitting hole 15 is formed in a substantially elliptical shape that is an ellipse in a direction connecting the holder body 1 and the positioning pin 8 located in the radial direction with respect to the holder body 1, and the ellipse is formed. The part 16a of the hole wall 16 of the fitting hole portion 15 that forms the portion is linear.

According to a second aspect of the present invention, the structure according to the first aspect is adopted in which a part 16b of the hole wall 16 of the fitting hole portion 15 is cut out.

[0013]

According to claim 1 of the present invention, as shown in FIG. 2, the fitting hole portion 15 formed in the positioning block 9 is located in the holder body 1 and the positioning pin 8 located in the radial direction with respect to the holder body 1. It is formed in a substantially elliptical shape that is an ellipse in the direction connecting to and, and a part 16a of the hole wall 16 of the fitting hole portion 15 that forms the ellipse is linear. And For this reason, when the non-rotating support member 7 is subtly thermally expanded due to heat generation due to frictional resistance of the bearing 6 portion and the transmission gear 12 due to rotation of the drive shaft 5 or heat transfer from the cutting tool 4, positioning is performed. The pin 8 displaces along the linear portion 16a of the hole wall 16 of the fitting hole portion 15 following the thermal expansion of the non-rotational supporting member 7 as shown by the arrow.

The fitting hole 15 is surrounded by a circumferential wall 16 having a substantially elliptical shape in plan view, and the circumferential walls 16 reinforce each other, so that the wall thickness L is small. However, the positioning block 9 is sufficiently durable, and therefore the positioning block 14 as a whole is small, and the positioning block 9 does not enter the transfer path of the automatic exchange of the tool holder 3.

Further, according to the second aspect of the present invention, since the part 16b of the hole wall 16 of the fitting hole portion 15 is cut out, dust and chips accumulated inside the fitting hole portion 15 are cut out. It can be easily removed from the portion 15b to the outside.

[0016]

【Example】

 1 and 2 show a positioning block 14 according to an embodiment of the present invention, which comprises a block body 14a having a substantially convex side view and a fitting hole portion 15 formed on the end face of the convex portion. As shown in FIG. 4, the fitting hole 15 is formed in the direction connecting the holder body 1 of the tool holder 3 mounted on the spindle 2 of the machine tool and the positioning pin 8 located in the radial direction with respect to the holder body 1. The part 16a of the hole wall 16 of the fitting hole part 15 of the part forming the ellipse is linear. Since the displacement amount of the positioning pin 8 displaced by the thermal expansion of the non-rotating support member 7 is in the range of several microns to several microns, the length S of the linear portion 16a is 1 mm to several millimeters in consideration of the processing conditions. It may be formed in the range.

An oil passage 17 communicating with the fitting hole 15 and communicating with the outside is appropriately formed, and is used in the case of a tool holder for a cutting tool with an oil hole.

As shown in FIG. 3, a portion 16 b of the hole wall 16 forming the fitting hole portion 15 in the oval direction is cut out to remove dust and chips easily retained inside the fitting hole portion 15. It can be removed from the portion 15b.

In the holder main body 1 of the tool holder 3, however, the elliptical portion of the substantially elliptical fitting hole portion 15 connects the holder main body 1 and the positioning pin 8 located in the radial direction with respect to the holder main body 1. It is used by being fixed to the end surface of the machine body 10 of the machine tool by a fixing metal fitting 18 such as a bolt at a position where the tip of the positioning pin 8 is fitted properly along the direction.

[0020]

[Effect of the device]

 According to claim 1 of the present invention, the fitting hole portion of the positioning block has a substantially elliptical shape, and a part of the hole wall is linearly formed, so that the thermal expansion of the non-rotating support member is performed. When the positioning pin receives a radial load due to the positioning pin, the positioning pin follows this linear displacement and displaces along the straight line portion to prevent distortion in the holder body and non-rotating support member, and to prevent non-rotation. It is possible to satisfactorily perform cutting work with a cutting tool that is directly or indirectly supported by the support member.

Further, according to claim 1 of the present invention, since the positioning block can be formed as small as possible, when the tool holder is automatically replaced by the manipulator of the machine tool with an ATC, the positioning block is It can be easily adopted in a numerically controlled machine tool equipped with this type of automatic tool changer without any hindrance.

Further, according to claim 2 of the present invention, a part of the hole wall of the fitting hole portion can be cut out to remove dust and chips, so that when the tool holder is used sideways. Further, by mounting the positioning block sideways on the machine body of the machine tool so that the notch is located below the fitting hole, it is possible to more easily remove dust and chips in the fitting hole. it can.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a front view showing the other embodiment.

FIG. 4 is an overall side view showing a usage state of a conventional example.

FIG. 5 is a front view of the same.

FIG. 6 is a front view of the conventional example.

FIG. 7 is a front view of the conventional example.

[Explanation of symbols]

 1 Holder Main Body 2 Spindle 3 Tool Holder 4 Cutting Tool 7 Non-Rotating Support Member 8 Positioning Pin 10 Machine Main Body 14 Positioning Block 15 Fitting Hole 16 Hole Wall 16a Straight Line 16b Notch

Claims (2)

[Scope of utility model registration request] 1. A tool holder mounted on a spindle of a machine tool, which is a positioning block attached to an end surface of a machine tool on a machine body side for positioning a non-rotating support member of the tool holder in a non-rotating state. The main body has a fitting hole into which a positioning pin on the tool holder side fits, and the fitting hole is an ellipse in a direction connecting the holder main body and a positioning pin located in a radial direction with respect to the holder main body. A positioning block for a non-rotating support member in a tool holder, which is formed in an elliptical shape, and a part of a hole wall of a fitting hole in a portion forming the ellipse is linear. 2. A positioning block for a non-rotating support member in a tool holder according to claim 1, wherein a part of the fitting hole is cut out.