JPH10291135A - Pressure head of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the drilling accuracy of a deep hole drilling tool, by providing a pressure head with a pressure table fixed to a point part of a slide base, and a tool guide moving device for moving a tool guide in front-and-back direction integrally with a guide moving cylinder. SOLUTION: In a deep hole drilling work, a pressure table 33 on which a guide moving cylinder 35 and a tool guide 36 are mounted, is integrally connected with a slide base 12 through a connection bolt 38. Accordingly, the possibility of the contact with eccentricity of a point face of the tool guide 36 caused by the oil film between the pressure table 33 and the slide base 12, and the contact with eccentricity of a point face of the tool guide 36 generated when the pressure table 33 is finally fixed to the slide base 12 by a clamp mechanism can be prevented, and the drilling accuracy of the deep hole drilling tool can be sufficiently ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling shaft used for deep hole drilling in a work by the BTA method, which is supported by a pressure table so as to be able to advance and retreat and rotate freely, and is connected to the tip of the drilling shaft. The present invention relates to a pressure head of a machine tool used for supplying high-pressure cutting oil to a deep hole cutting tool via a pressure table.

[0002]

2. Description of the Related Art Conventionally, as a pressure head of a machine tool for the above-mentioned purpose, there is a pressure head B of a machine tool of the type shown in FIG. As shown in the figure, the pressure table 70 is slidably attached to a vertical column (not shown) at the tip of a slide base 71 which is attached to a vertical column (not shown) so as to be vertically movable. A large-diameter through-hole 72 is bored in the pressure table 70 in the front-rear direction, and a cylindrical guide advance / retreat cylinder 73 is provided in the through-hole 72 so as to be able to advance / retreat in the front-rear direction. A tool guide 76 for rotatably and advancing and retracting the tip of a drilling shaft 75 to which a deep hole cutting tool 74 is connected is attached to the tip of the advancing and retracting cylinder 73.

On the slide base 71, the pressure table 7
0, a slide base reciprocating cylinder 77 for moving the pressure table 70 forward and backward relative to the slide base 71 is mounted on the position of the pressure base 70. A tool moving device 78 that moves the tool guide 76 and the deep hole cutting tool 74 in the front-rear direction relative to the pressure table 70 is attached. On an upper surface of the slide base 71 on which the pressure table 70 slides, a clamp mechanism 79 for fixing the pressure table 70 to the slide base 71 at a predetermined slide position is provided. Further, a cutting oil supply passage for supplying high pressure cutting oil supplied from the outside to the deep hole cutting tool 74 is formed in the pressure table 70 and the guide advance / retreat cylinder 73. Is the hole machining axis 75
The cutting oil return passage formed therein is communicated with the front end of the hole machining shaft 75.

When a deep hole is drilled in a work 80 as shown in FIG. 6 using a pressure head B of a machine tool having such a configuration, first, a slide base advance / retreat cylinder 77 is driven to drive a pressure table 70. Then, the pressure table 70 is fixed to the slide base 71 by operating the clamp mechanism 79. The tool moving device 78 is driven to advance the tool guide 76 together with the guide advancing / retracting cylinder 73, and the distal end surface of the tool guide 76 is pressed against the facing surface 81 of the work 80 to be brought into contact therewith. Then, work 80
The drilling operation is performed by causing a spindle head (not shown) to advance by a spindle head advance / retreat device and rotating a rotary motor provided in the spindle head, thereby forming a deep hole cutting tool 7.
4 can be advanced toward the work 80 while rotating.

[0005]

However, the pressure head B of the machine tool described above still has the following problems to be solved. That is, in the pressure head B of the machine tool described above, since the pressure table 70 is made to advance and retreat by sliding the pressure table 70 on the slide base 71, an oil film inevitably generated on the upper surface of the slide base 71. As a result, a gap is formed between the sliding surfaces of the two, so that the tip surface of the tool guide 76 is pressed against the opposing surface 81 of the work 80 in a state where the tool guide 76 is biased, and the tool guide 76 is tilted, and the Drilling accuracy could not be sufficiently ensured.

Further, since a gap is formed between the sliding surface of the pressure base 70 and the slide base 71, the tool guide 76 may be inclined even when the pressure table 70 is finally fixed to the slide base 71 by the clamp mechanism 79. In this case, too, the work 80 is held in a state in which the tip end surface of the
Of the deep hole cutting tool 74 could not be sufficiently secured. Further, in order for the tool guide 76 to abut on the workpiece 80, two guide moving devices, a slide base reciprocating cylinder 77 and a tool moving device 78, are required, so that the structure is complicated and complicated, and the pressure head of the machine tool is increased. B was expensive.

[0007] The present invention has been made in view of such circumstances, and a machine tool which can improve the drilling accuracy of a deep hole cutting tool by integrally fixing a pressure table to a slide base. It is intended to provide a pressure head.

[0008]

According to the present invention, there is provided a semiconductor device comprising:
The pressure head of the machine tool described above is attached to the tip of a slide base that is slidably mounted vertically on a vertical column, and rotates the tip of a drilling shaft that is connected to a deep hole cutting tool at the tip. A pressure table fixedly attached to a tip of the slide base, wherein the pressure table is fixedly attached to a tip of the slide base; A guide advance / retreat cylinder slidably disposed in the front-rear direction within a large-diameter through-hole provided in the guide hole, and the deep hole cutting tool slidably attached to the front end of the guide advance / retreat cylinder in a detachable manner. And a tool guide moving device for moving the tool guide in the front-rear direction integrally with the guide advance / retreat cylinder.

The pressure head of the machine tool according to claim 2 is
2. The pressure head of a machine tool according to claim 1, wherein the tool guide moving device is attached to an outer surface of the pressure table, and a telescopic rod extends and extends rearward of the pressure table. A connecting rod connected to the extension end of the telescopic rod and the other end connected to the rear end of the guide advancing and retracting cylinder. The pressure head of a machine tool according to claim 3 is the pressure head of the machine tool according to claim 1, wherein a clamp mechanism for fixing the guide advance / retreat cylinder at an arbitrary advance / retreat position is provided inside the pressure table. Have been.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

First, a configuration of a spindle head A of a machine tool including the pressure heads 18 to 20 of the machine tool according to the present embodiment will be described with reference to FIGS. A common saddle 11 made of a single plate is provided along one side surface of the vertical column 10 erected on the floor surface with a pair of guides 25,
It is mounted so as to be able to move up and down by 26. A plurality of horizontally long slide bases 12 to 14 are attached to the common saddle 11 in parallel at an interval in the vertical direction. At the front and rear ends of the slide bases 12 to 14, pressure heads 18 to 2 of a machine tool for supporting the front and rear ends of a horizontally long BTA-type drilling shaft 15 to 17 rotatably and advancing and retracting, respectively.
0 and headstocks 21 to 23 are attached. Deep hole cutting tools 27 to 29 are attached to the tips of the hole processing shafts 15 to 17, respectively. Further, headstock advance / retreat motors 30 to 32 are attached to the left ends of the slide bases 12 to 14, respectively. Further, a shaft center adjusting mechanism 24 capable of adjusting the space between the shaft centers of the drilling shafts 15 to 17 by adjusting the space between the slide bases 12 to 14 is attached to the common saddle 11.

Next, the configuration of the pressure heads 18 to 20 of the machine tool according to the present embodiment will be described in detail with reference to FIGS. Since the pressure heads 18 to 20 have the same configuration, the pressure head 18 will be described below.
As shown in FIGS. 3 to 5, the pressure head 18 is substantially a pressure table 33 fixed to the front end of the slide base 12.
A guide advance / retreat cylinder 35 slidably disposed in the front-rear direction in a large-diameter through hole 34 provided in the pressure table 33, and a deep hole cutting removably attached to the tip of the guide advance / retreat cylinder 35. Cylindrical tool guide 36 that slidably supports the tool 27
And a tool guide moving device 37 that moves the tool guide 36 in the front-rear direction integrally with the guide advance / retreat cylinder 35.

The configuration of each part of the pressure head 18 of the machine tool having the above-described basic configuration will be described below. FIG.
As shown in FIG. 5, the pressure table 33 includes a lower fixed plate 33a formed of a thick rectangular plate, and an upper support tube 33b formed of a thick cylinder integrally provided on the lower fixed plate 33a. And the lower fixing plate 33a is provided with a connecting bolt 38.
Is fixed to the tip of the slide base 12.
A cutting oil supply sleeve 39 is fitted at the center of the inside of the upper support cylinder 33b, and a portion formed before and after the cutting oil supply sleeve 39 is radially moved by clamp pressure oil described later. A pair of clamp rings 40 and 41, which are examples of a clamp mechanism that expands and contracts, are fitted.

Further, inside the upper support cylinder 33b and at the portion forming the rear part of the rear clamp ring 40,
A ring piston 42 is fitted, and a piston holding flange 43 is fitted at a position forming a rear portion of the ring piston 42. An outer peripheral edge of the piston holding flange 43 is connected to a rear end surface of the upper support cylinder 33b by a connecting bolt 44. ing. On the other hand, a ring holding flange 45 is fitted to a portion forming a front part of the front clamp ring 41, and the ring holding flange 45 is connected to the upper support cylinder 33b by a connecting bolt 46.
Is connected to the front end face of

As shown in FIG. 5, the inner surface of the cutting oil supply sleeve 39 and the clamp rings 40, 4
1, the inner surface of the ring piston 42, the inner surface of the piston holding flange 43, and the inner surface of the ring holding flange 45, form a large-diameter through-hole 34. Guide advance / retreat cylinder 3 to be explained
5 is attached so as to be able to move back and forth in the front-rear direction. As shown in FIG. 5, the guide advance / retreat cylinder 35 is formed of a long hollow cylinder having an outer diameter substantially the same as the inner diameter of the through-hole 34, and a tool guide 36 is detachably fitted at the tip thereof. Along with
An annular seal member 46 a is attached to a rear portion thereof by a seal holding flange 47.

The tool guide 36 has a large diameter tapered rear cylindrical portion 3.
6a and a small-diameter straight tube-shaped front tube portion 36b. The rear cylinder portion 36a is detachably fitted into the guide advance / retreat cylinder 35. A work contact surface 48 is formed on a front end surface of the front cylinder portion 36b, and a tool guide surface 49 is formed on an inner surface thereof. In the state where the above-mentioned guide advance / retreat cylinder 35 and the tool guide 36 are inserted, the hole machining shaft 15 formed of a long tube is disposed concentrically in the guide advance / retreat cylinder 35. A deep hole cutting tool 27 is attached to the tip. As shown in FIG. 5, the drilling shaft 15 is sealed by an annular sealing member 46a, and the outer diameter of the deep hole cutting tool 27 is substantially equal to the inner diameter of the front cylindrical portion 36b of the tool guide 36.

With the above configuration, the guide advance / retreat cylinder 35
A cutting oil inflow space 50 whose front and rear ends are sealed is formed therein.
A second cutting oil inflow hole 51 provided in the center of the guide advance / retreat cylinder 35, an annular groove 52 formed in the inner surface of the cutting oil supply sleeve 39, and a first cutting formed in the center of the guide advance / retreat cylinder 35 Through the oil inlet hole 53 and an annular groove 54 formed at the center of the inner surface of the upper support cylinder 33b, the pressure table 33
Is connected to a cutting oil supply channel 55 formed at a lower front part of the cutting oil supply passage 55. On the other hand, a front portion of the cutting oil inflow space 50 is connected to a cutting oil return flow passage formed in the drilling shaft 15 via a cutting oil return flow passage provided in the tool guide 36.

As shown in FIG. 5, a pressure oil inflow chamber 56 is formed between the rear surface of the ring piston 42 and the front surface of the piston holding flange 43.
Is connected to a pressure oil supply channel 57 formed at the lower rear portion of the pressure table 33. Next, the configuration of the tool guide moving device 37 that moves the tool guide 36 in the front-rear direction integrally with the guide advance / retreat cylinder 35 will be described.

As shown in FIGS. 3 to 5, a guide moving cylinder 58 is mounted on the upper surface of the upper support cylinder 33b of the pressure table 33, and its telescopic rod 59 can be horizontally expanded and contracted rearward. Can be. A tip of the telescopic rod 59;
The rear part of the guide advancing / retreating cylinder 35 is interlockingly connected by a connecting rod 60 extending in the vertical direction. That is, the connecting rod 60
Is connected to the front end of the telescopic rod 59, and the lower end is connected to the rear end of the guide advance / retreat cylinder 35. With this configuration, the guide moving cylinder 58 operates, and the guide advance / retreat cylinder 35 advances to the pressure table 33,
The work contact surface 48 of the tool guide 36 can be pressed against the wall surface of the work W in a pressed state.

Next, a deep hole cutting operation using the pressure head 18 of the machine tool having the above configuration will be described.
The guide advance / retreat cylinder 35 and the tool guide 36 at the standby position indicated by the solid line in FIG. 3 are advanced forward by operating the guide moving cylinder 58, and the workpiece contact surface 48 of the tool guide 36 is indicated by an imaginary line in FIG. Abut as shown by. By supplying high-pressure hydraulic oil into the hydraulic oil inflow chamber 56 through the hydraulic oil supply passage 57, the clamp ring 40 is pressed and deformed to generate a radial clamping force. At the same time, the above-described pressing force is also transmitted to the clamp ring 41 via the cutting oil supply sleeve 39 to compress and deform the clamp ring 41, thereby generating a radial clamping force. By these clamping forces, the guide advance / retreat cylinder 35 and the tool guide 36 are strongly integrated with the pressure table 33. Thereafter, by operating the headstock advance / retreat motor 30 and the rotary motor built in the headstock 21, the drilling shaft 15 and the deep hole cutting tool 27 connected to the tip thereof are integrally rotated. While moving forward, a deep hole can be cut in the work W.

In the above-described deep hole cutting operation, the pressure table 33 on which the guide advance / retreat cylinder 35 and the tool guide 36 are attached is different from the conventional one in that the connecting bolt 3 is attached to the slide base 12.
8 are integrally connected. Therefore, there is a problem in the prior art that the tool guide generated when the pressure base is finally fixed to the slide base by the biasing of the tip end surface of the tool guide caused by the oil film between the pressure base and the slide base and the clamp mechanism. This eliminates the risk of uneven contact of the front end surface of the tool, and ensures sufficient drilling accuracy of the deep hole cutting tool 27. Note that the above-described deep hole cutting operation can be similarly performed on the other pressure heads 19 and 20.

In this embodiment, the tool guide moving device 37 is attached to the outer surface of the pressure table 33 and has a telescopic rod 59 whose extension rod 59 extends rearward of the pressure table 33; Since the connecting rod 60 is connected to the extension end of the telescopic rod 59 and the other end is connected to the rear end of the guide moving cylinder 35, the guide moving cylinder 35 and the tool guide 36 move smoothly. It is possible to integrate the pressure heads 18 to 20 in a compact form without hindering the operation, and to reduce the size of the tool guide moving device 37.

Further, in this embodiment, the clamp rings 40 and 41 are disposed inside the pressure table 33 as an example of a clamp mechanism for fixing the guide advance / retreat cylinder 35 at an arbitrary advance / retreat position. Tool guide moving device 37
Can be reduced in size.

As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and is described in the claims. The present invention also includes other embodiments and modifications that can be considered within the scope of the matters.

[0025]

In the pressure head for a machine tool according to any one of claims 1 to 3, the pressure head attached to the slide base includes a pressure table fixed to the leading end of the slide base, and a large diameter provided on the pressure table. Guide advance / retreat cylinder slidably disposed in the through-hole of the front and rear direction, and a cylindrical tool guide removably attached to the tip of the guide advance / retreat cylinder to slidably support a deep hole cutting tool. And a tool guide moving device that moves the tool guide in the front-rear direction integrally with the guide advance / retreat cylinder.

As described above, since the pressure table is integrally connected to the slide base unlike the related art, the tip surface of the tool guide caused by the oil film between the pressure table and the slide base, which has been a problem in the prior art, This eliminates the risk of uneven contact of the tool guide tip surface when the pressure table is finally fixed to the slide base due to the uneven contact of the tool or the clamp mechanism, and ensures sufficient drilling accuracy for deep hole cutting tools. it can.

According to a second aspect of the present invention, in the pressure head for a machine tool, the tool guide moving device is mounted on an outer surface of the pressure table and has a telescopic rod extending rearward of the pressure table. One end is connected to the extension end of the telescopic rod, and the other end is provided with a connecting rod connected to the rear end of the guide advancing / retracting cylinder. Therefore, the tool guide moving device can be reduced in size and can be incorporated in the pressure head in a compact form.

Further, in the pressure head of the machine tool according to the third aspect, since the clamp mechanism for fixing the guide advance / retreat cylinder at an arbitrary advance / retreat position is provided inside the pressure table, the pressure head can be downsized. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a spindle head of a machine tool including a machine tool pressure head according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of the pressure head of the machine tool according to one embodiment of the present invention.

FIG. 4 is a front view of the same.

FIG. 5 is an enlarged side sectional view of the same.

FIG. 6 is a side view of a pressure head of a conventional machine tool.

[Explanation of symbols]

Reference Signs List A Spindle head of machine tool W Workpiece 10 Vertical column 11 Common saddle 12 Slide base 13 Slide base 14 Slide base 15 Drilling shaft 16 Drilling shaft 17 Drilling shaft 18 Pressure head 19 Pressure head 20 Pressure head 21 Headstock 22 Headstock Reference Signs List 23 headstock 24 shaft center adjustment mechanism 25 guide guide 26 guide guide 27 deep hole cutting tool 28 deep hole cutting tool 29 deep hole cutting tool 30 headstock advance / retreat motor 31 headstock advance / retreat motor 32 headstock advance / retreat Motor 33 Pressure table 33a Lower fixing plate 33b Upper support cylinder 34 Through hole 35 Guide advance / retreat cylinder 36 Tool guide 36a Rear cylinder 36b Front cylinder 37 Tool guide moving device 38 Connecting bolt 39 Cutting oil supply sleeve 40 Clamp ring 41 Clamp ring 42 Ring piston 43 fixie Retaining flange 44 connecting bolt 45 ring retaining flange 46 connecting bolt 46a annular sealing member 47 seal retaining flange 48 work contact surface 49 tool guide surface 50 cutting oil inflow space 51 second cutting oil inflow hole 52 annular groove 53 first cutting oil Inlet hole 54 Annular groove portion 55 Cutting oil supply flow path 56 Pressure oil inflow chamber 57 Pressure oil supply flow path 58 Guide moving cylinder 59 Telescopic rod 60 Connecting rod

Claims (3)

[Claims] 1. A tip of a drilling shaft which is attached to the tip of a slide base which is attached to a vertical column so as to be slidable in the vertical direction, and to which a tip for cutting a deep hole is connected is rotatable and reciprocable. And a pressure head of a machine tool for supplying cutting oil to the deep hole cutting tool, wherein the pressure head is provided on a pressure table fixed to a leading end of the slide base, and on the pressure table. A guide advance / retreat cylinder slidably disposed in the large-diameter through hole in the front-rear direction, and a cylinder detachably attached to the tip of the guide advance / retreat cylinder to slidably support the deep hole cutting tool. A pressure head for a machine tool, comprising: a tool guide in a shape of a circle; and a tool guide moving device that moves the tool guide in the front-rear direction integrally with the guide advance / retreat cylinder. 2. A guide moving cylinder, wherein the tool guide moving device is attached to an outer surface of the pressure table and has a telescopic rod extending rearward of the pressure table, and one end is connected to an extending end of the telescopic rod. The pressure head of a machine tool according to claim 1, further comprising: a connecting rod having the other end connected to a rear end of the guide advancing and retracting cylinder. 3. The pressure head of a machine tool according to claim 1, wherein a clamp mechanism for fixing the guide advance / retreat cylinder at an arbitrary advance / retreat position is provided inside the pressure stand.