WO2015004979A1

WO2015004979A1 - Main shaft unit

Info

Publication number: WO2015004979A1
Application number: PCT/JP2014/062420
Authority: WO
Inventors: 拓至田内
Original assignee: 三菱重工業株式会社
Priority date: 2013-07-10
Filing date: 2014-05-09
Publication date: 2015-01-15
Also published as: JP2015016519A

Abstract

The present invention is a main shaft unit (100) provided with: an assembly block (102) having a main shaft hole (102a) formed in the distal end and into which a tool is inserted, and a communication hole (102b) formed for communicating the main shaft hole (102a) and the proximal end; a main shaft main body (101) having an attachment hole (101a) formed in the distal end and accommodating the block (102), and a through-hole (101b) formed passing through the proximal end side and the communication hole (102b) of the block (102); a rod (113); a flange member (116) attached to the proximal end side of the rod (113); a bush (114) for supporting the distal end side of the rod (113) in a slidably moveable manner; a grasping device (110) for grasping the tool in a manner that allows the tool to be attached and detached along with the movement of the rod (113); a disc spring (119) placed between the bush (114) and the flange member (116); and a vibration damping device (120) provided to an attachment groove (102c) in the outer peripheral surface of the block (102).

Description

Spindle unit

The present invention relates to a spindle unit, and is particularly useful when applied to a horizontal boring machine.

The horizontal boring machine increases the length of the main spindle body and allows the spindle main body to be longer than the diameter of the hole so that the deep hole formed in the workpiece can be expanded or finished. Since the diameter size cannot be increased, vibration is likely to occur on the tip side of the main spindle body, and it is difficult to increase the cutting ability.

Therefore, for example, in Patent Document 1 described below, a spindle that damps vibrations of the spindle main body and enhances cutting ability by providing a buffer member serving as a damping element at the axial central portion of the through hole of the spindle main body. Suggest a unit.

JP 2010-201587 A JP 2009-190141 A

By the way, in the main shaft unit described in Patent Document 1, the damping member serving as a damping element is provided at the axial center portion of the through hole of the main shaft main body. Has become difficult to express sufficiently. Therefore, it is conceivable to provide vibration damping means on the tip end side of the through hole of the main spindle body. However, a collet that detachably holds the tool and a dish that urges the collet through a rod inside the main spindle. Since the vibration damping means is positioned between the spring and the biasing force of the disc spring is applied to the vibration damping means, the vibration damping means must be able to withstand the biasing force of the disc spring. It becomes a complicated structure.

Such a problem is not limited to the spindle unit applied to the horizontal boring machine, but also to the spindle unit applied to the boring machine such as the vertical boring machine, and the spindle unit in which the tool is mounted at the tip of the spindle body. Can be produced in the same manner as described above.

Therefore, an object of the present invention is to provide a spindle unit capable of efficiently attenuating vibration on the tip side of the spindle body with a simple configuration.

The spindle unit according to the first invention for solving the above-described problem has a spindle hole into which the proximal end side of the tool is inserted at the distal end, and communicates between the spindle hole and the proximal end. An assembly block in which a communication hole is formed, a mounting hole in which the assembly block is built, and a through hole that is formed between the communication hole and the base end side of the assembly block. A main body is disposed in the through hole of the main spindle body and the communication hole of the assembly block so as to communicate between the distal end side and the proximal end side of the main spindle body, and is arranged in the axial direction of the main spindle body. A rod movable along the flange, a flange member attached to the proximal end side of the rod, and a slide attached to the proximal end inside the communication hole of the assembly block. A bush that is movably supported, and disposed on the distal end side in the communication hole of the assembly block, the base end of the tool is detachably opened along with the movement of the rod toward the distal end side of the main spindle body. And a tool gripping means for gripping the base end side of the tool as the rod moves to the base end side of the main spindle body, and the bush and the flange member are disposed between the bush and the flange member. And an urging means for urging the flange member in a direction away from the flange member, and a vibration attenuating means provided in an attachment groove formed on the outer peripheral surface of the assembly block for attenuating vibration. To do.

The spindle unit according to a second aspect of the present invention is the spindle unit according to the first aspect, wherein the mounting groove of the assembly block includes a radially outer portion of the communication hole and an axially middle portion of the spindle hole. It is formed in at least one part of the part.

The third invention is a ramstock characterized in that the spindle unit of the first or second invention is provided.

The fourth invention is a machine tool characterized by including a ram stock provided with the spindle unit of the first or second invention.

And the 5th invention is a machine tool characterized by being a horizontal boring machine in the 4th invention.

In the spindle unit according to the present invention, the vibration attenuating means is arranged on the assembly block, that is, the vibration attenuating means is arranged near the tip of the spindle body, so that the large vibration on the tip side of the spindle body is efficiently Since the vibration damping means can be well damped and the vibration damping means is disposed in the mounting groove of the assembly block, the biasing means can be attached even if the vibration damping means is located near the tip of the main spindle body. No power is applied to the vibration damping means. For this reason, in the spindle unit according to the present invention, it is not necessary for the vibration damping means to be able to withstand the urging force of the urging means, so that a simple configuration can be achieved. Therefore, according to the spindle unit according to the present invention, it is possible to efficiently attenuate the vibration on the tip side of the spindle body with a simple configuration.

It is the whole schematic block diagram of main embodiment at the time of applying the spindle unit concerning the present invention to a horizontal boring machine. It is sectional drawing showing the internal structure of the spindle unit of the horizontal boring machine of FIG. It is an extraction enlarged view of the arrow ridge III part of FIG.

DETAILED DESCRIPTION Embodiments of a spindle unit according to the present invention will be described with reference to the drawings. However, the present invention is not limited only to the following embodiments described with reference to the drawings.

<Main embodiment>
A main embodiment in which the spindle unit according to the present invention is applied to a horizontal boring machine will be described with reference to FIGS.

As shown in FIG. 1, a column base 12 is provided on the bed 11, and the column base 12 moves relative to the bed 11 along the longitudinal direction of the bed 11 via a guide rail 11a. Can be done. A column 13 is erected on the top of the column base 12.

A saddle 14 is provided on the side surface of the column 13, and the saddle 14 can move along the vertical direction with respect to the column 13 via a guide rail 13a. A ram stock 15 is provided on a side surface of the saddle 14, and the ram stock 15 extends along a horizontal direction perpendicular to the moving direction of the column base 12 with respect to the saddle 14 via a guide rail 14 a. It can be moved.

The spindle unit 100 passes through the ram stock 15 along a direction parallel to the moving direction of the ram stock 15, and the spindle unit 100 can be extended outward from the ram stock 15. The ram stock 15 protrudes and is supported rotatably.

As shown in FIGS. 2 and 3, a mounting hole 101 a that houses a cylindrical assembly block 102 is provided at the front end (left end in FIGS. 2 and 3) of the main spindle body 101 of the main spindle unit 100. It is formed so as to be coaxial with 101. A spindle hole 102a into which the base end side of the tool is inserted is attached to the distal end (the left end in FIGS. 2 and 3) of the assembly block 102 that is integrally attached in the attachment hole 101a of the spindle body 101. It is formed so as to be coaxial with the assembly block 102.

In the assembly block 102, a communication hole 102b that communicates between the main shaft hole 102a and a base end (right end in FIGS. 2 and 3) is formed so as to be coaxial with the assembly block 102. . Inside the main spindle body 101, a through-hole penetrating between the communication hole 102b of the assembly block 102 housed in the mounting hole 101a and the base end side (right side in FIG. 2) of the main spindle body 101 is provided. 101 b is formed so as to be coaxial with the main spindle body 101.

On the distal end side of the communication hole 102b of the assembly block 102, that is, on the spindle hole 102a side (left side in FIG. 3), a gripping device 110 that is a tool gripping means for detachably gripping the base end side of the tool. The casing 111 is fitted. A collet 112 is provided inside the casing 111 of the gripping device 110 so as to be movable along the axial direction of the main spindle body 101.

A rod 113 communicating between the distal end side and the proximal end side of the spindle body 101 is coaxial with the spindle body 101 in the through hole 101b of the spindle body 101 and the casing 111 of the gripping device 110. The rod 113 has a distal end side (left side in FIGS. 2 and 3) that is engaged with a proximal end side (right side in FIGS. 2 and 3) of the collet 112 of the gripping device 110. Match. The base end side of the assembly block 102 inside the communication hole 102b, that is, the through hole 101b side (right side in FIGS. 2 and 3) of the main spindle body 101 is closer to the tip of the rod 113 (FIGS. 2 and 2). 3, a bush 114 that is slidably supported is fitted.

As shown in FIG. 2, an annular flange member 116 is integrally attached coaxially with the rod 113 on the outer peripheral surface of the rod 113 near the base end (rightward in FIG. 2). The flange member 116 is inserted so as to be slidable relative to the through hole 101b of the main spindle body 101.

The base end side (right side in FIG. 2) of the rod 113 is connected to a hydraulic drive device (not shown) built in the ram stock 15, and the hydraulic drive device connects the rod 113 to the main spindle body 101. It can be reciprocated along the axial direction in the through hole 101b.

A plurality of disc springs 119 as urging means are inserted between the bush 114 and the flange member 116 on the outer peripheral surface of the rod 113, and the disc spring 119 includes the bush 114 and the flange. It is possible to urge the member 116 away from the member 116, that is, urge the rod 113 to move to the base end side (right side in FIG. 2) via the flange member 116 by the bush 114. It is like that.

As shown in FIG. 3, mounting

grooves

102c and 102d are formed on the outer peripheral surface of the assembly block 102 in the radially outer portion of the communication hole 102b and the radially outer portion in the middle of the axial direction of the main shaft hole 102a. Is formed over the entire length in the circumferential direction. A vibration attenuating device 120 that is a vibration attenuating means for attenuating vibration as described in, for example, Patent Document 2 is attached to the inside of the mounting

grooves

102c and 102d of the assembly block 102.

In the horizontal boring machine 10 provided with the main spindle unit 100 according to this embodiment, the rod 113 is pushed against the biasing force of the disc spring 119 via the flange member 116 and the tip of the main spindle body 101 is moved. By operating the hydraulic drive device so as to move toward the side (left side in FIGS. 2 and 3), the tip end side of the collet 112 of the gripping device 110 is pushed out from the casing 111 to expand the diameter, After the base end side of the tool is inserted into the spindle hole 102a of the assembly block 102 and the base end portion of the tool is inserted into the front end side of the collet 112, the rod 113 is moved by the biasing force of the disc spring 119. By switching the operation of the hydraulic drive device so as to move toward the base end side (right side in FIGS. 2 and 3) of the main spindle body 101, The collet 112 has its distal end side pulled into the casing 111 together with the base end portion of the tool to reduce the diameter, and the tool is placed in close contact with the inner peripheral surface of the spindle hole 102a of the assembly block 102. Grab.

Again, the rod 113 is moved toward the distal end side (left side in FIGS. 2 and 3) of the main spindle body 101 against the biasing force of the disc spring 119 via the flange member 116. When the distal end side of the collet 112 of the gripping device 110 is pushed out of the casing 111 together with the base end portion of the tool by operating the hydraulic drive device, and the diameter of the distal end side of the collet 112 is expanded again, the base of the tool is increased. The end portion is released from the grip of the collet 112, and the tool can be removed from the spindle hole 102a of the assembly block 102.

And while rotating the spindle unit 100 to rotate the tool, the column base 12 is moved with respect to the bed 11, the saddle 14 is moved with respect to the column 13, and the ram stock 15 is moved with respect to the saddle 14. Boring can be performed on the workpiece by moving the tool three-dimensionally.

At this time, in the spindle unit 100, the vibration damping device 120 is disposed in the assembly block 102, that is, the vibration damping device 120 is disposed near the tip of the spindle body 101. Large vibrations on the tip end side of the main spindle body 101 that accompany the boring are efficiently damped.

In addition, since the vibration damping device 120 is disposed in the mounting groove 102c of the assembly block 102, the plate is not affected even if the vibration damping device 120 is located near the tip of the main spindle body 101. The biasing force of the spring 119 is not applied to the vibration damping device 120.

For this reason, in the horizontal boring machine 10 according to the present embodiment, since it is not necessary to allow the vibration damping device 120 to withstand the urging force of the disc spring 119, the spindle unit 100 has a simple configuration. be able to.

Therefore, according to the main spindle unit 100 of the horizontal boring machine 10 according to the present embodiment, it is possible to efficiently attenuate the vibration on the front end side of the main spindle body 101 with a simple configuration.

Further, in the outer peripheral surface of the assembly block 102, in the mounting

grooves

102c and 102d formed in the radially outer portion of the communication hole 102b and the radially outer portion in the middle of the axial direction of the main shaft hole 102a. Since the vibration damping device 120 is attached, the thickness (wall thickness) of the radially outer portion on the axial front end side and the base end side of the main shaft hole 102a of the assembly block 102 is not reduced. The base end side of the tool can be firmly adhered to the inner peripheral surface of the main shaft hole 102a of the assembly block 102, and the tool can be more reliably gripped stably.

<Other embodiments>
In the above-described embodiment, the mounting groove is formed on both the radially outer portion of the communication hole 102b and the radially outer portion of the main shaft hole 102a on the outer peripheral surface of the assembly block 102. 102c and 102d are formed and the vibration damping device 120 is attached thereto, but as another embodiment, depending on various processing conditions, for example, the radial direction of the communication hole 102b on the outer peripheral surface of the assembly block 102 It is also possible to attach the vibration damping device 120 by forming a mounting groove only in one of the outer portion and the radially outer portion in the middle of the main shaft hole 102a in the axial direction.

In the above-described embodiment, the case where the present invention is applied to the horizontal boring machine 10 has been described. However, the present invention is not limited to this, and a tool is attached to the tip of the main spindle body such as a boring machine such as a vertical boring machine. If it is a machine tool provided with the spindle unit which mounts, it can apply like the case of the embodiment mentioned above.

However, when applied to a horizontal boring machine as in the above-described embodiment, the effects of the spindle unit according to the present invention can be expressed most significantly, which is very preferable.

Since the spindle unit according to the present invention can be efficiently damped to vibrations on the tip side of the spindle body with a simple configuration, it can be used extremely beneficially, for example, in the metal processing industry.

DESCRIPTION OF SYMBOLS 10 Horizontal boring board 11 Bed 11a Guide rail 12 Column base 13 Column 13a Guide rail 14 Saddle 14a Guide rail 15 Ram stock 100 Spindle unit 101 Spindle body 101a Mounting hole 101b Through hole 102 Assembly block 102a Spindle hole

102b Communication hole

102c, 102d Mounting groove 110 Grasping device 111 Casing 112 Collet 113 Rod 114 Bush 116 Flange member 119 Belleville spring 120 Vibration damping device

Claims

An assembly block in which a main shaft hole into which the base end side of the tool is inserted is formed at the front end, and a communication hole is formed to communicate between the main shaft hole and the base end;
A spindle main body in which a mounting hole for interior of the assembly block is formed at the tip, and a through hole penetrating between the communication hole and the base end side of the assembly block is formed;
The main shaft main body is disposed in the through hole of the main spindle main body and the communication hole of the assembly block so as to communicate between the distal end side and the proximal end side of the main spindle main body, and moves along the axial direction of the main spindle main body. Possible rods,
A flange member attached to the proximal end side of the rod;
A bush attached to the proximal end inside the communication hole of the assembly block and supporting the rod so as to be slidable;
A base end of the spindle body is disposed on a distal end side in the communication hole of the assembly block and removably opens a base end portion of the tool as the rod moves toward the distal end side of the main spindle body. Tool gripping means for gripping the proximal end side of the tool with the movement of the rod to the side;
A biasing means disposed between the bush and the flange member and biasing the bush and the flange member away from each other;
And a vibration attenuating means provided in an attachment groove formed on the outer peripheral surface of the assembly block for attenuating vibration.
The spindle unit according to claim 1,
The spindle unit, wherein the mounting groove of the assembly block is formed in at least one of a radially outer portion of the communication hole and a radially outer portion in the middle of the spindle hole in the axial direction.
A ramstock characterized in that the spindle unit according to claim 1 or 2 is provided.
A machine tool comprising a ram stock provided with the spindle unit according to claim 1.
The machine tool according to claim 4,
A machine tool characterized by being a horizontal boring machine.