JP3943357B2 - Lathe with tailstock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an NC lathe, and more particularly to a lathe with an improved tailstock.
[0002]
[Prior art]
A general lathe includes a headstock fixed on a bed, a carriage having a tool post guided by a guide rail disposed on the bed, and a tailstock having a centering spindle guided by the guide rail. Prepare.
The carriage is driven and controlled by a ball screw.
By driving with the ball screw, the responsiveness of the operation of the carriage is improved, and high speed is achieved.
[0003]
[Problems to be solved by the invention]
By equipping the tailstock with a linear motion guide device such as a linear motion ball bearing block or linear motion roller bearing block, it is possible to achieve high speed movement.
For example, Japanese Patent Application Laid-Open No. 11-90704 discloses a tail stock moving device according to the present application provided with a linear guide device.
When used in the core pushing process, the tailstock needs to be strongly clamped to the linear guide rail. When this clamping force is directly applied to the linear guide device, problems such as damage occur in the linear guide device.
Therefore, the present invention provides a lathe equipped with a tailstock that eliminates the above-described problems.
[0004]
[Means for Solving the Problems]
A lathe according to the present invention is guided by a bed, a headstock mounted on the bed, a linear guide rail disposed on the bed, a carriage having a tool post guided by the guide rail, and the linear guide rail. The tail stock includes a linear guide block that engages with the linear guide rail, a hydraulic device that raises and lowers the tail stock , and a surface that abuts on the linear guide rail. When the tailstock is moved, it is guided by the linear guide rail only with the linear guide block , the tool post has an arm that has an engaging portion at the tip and can be extended and contracted, and a pin is erected on the tailstock. When the tailstock moves, the turret arm extends and the turret arm engaging part becomes the tailstock pin. By case, when moving the tool rest, comprising a tailstock which can cause the tailstock also moved.
[0005]
Further, the tail stock has a linear guide block is engaged with the linear guide rail, a hydraulic device for elevating the tailstock has a surface that contacts on the linear guide rail, clamp the tail stock, the tail By supplying hydraulic pressure to the lower part of the hydraulic cylinder chamber provided in the base at the bottom of the stock, the hydraulic piston inserted in the hydraulic cylinder is pulled up, the tail stock is lowered, and the lower surface of the tail stock base is linear It has a configuration made by being pressed against the upper surface of the guide rail .
[0006]
When the tailstock is clamped, the clamping force by the hydraulic device is not transmitted to the linear guide flock by the spring provided on the linear guide block .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing the overall configuration of an NC (numerical control) lathe for carrying out the present invention, and FIG. 2 is a view taken along the line AA in FIG.
The NC lathe generally indicated by reference numeral 1 has a headstock 20 fixed on a bed 10, and the headstock 20 includes a spindle 22 that can be rotated and indexed.
Two linear guide rails (guide surfaces) 110 and 110 and a ball screw 150 are arranged on the bed 10, and a carriage (reciprocating platform) 40 guided by the two linear guide rails 110 and 110. And a tail stock (core tailstock) 60 is mounted.
[0008]
In FIG. 2, the carriage 40 includes linear ball bearing blocks 410 and 420 that are fitted to linear guide rails 110 and 110 disposed on the bed 10. A ball nut 44 attached to the carriage 40 is screwed into a ball screw 150 disposed on the bed 10, and the carriage 40 moves on the linear guide rails 110, 110 according to the amount of rotation of the ball screw 150. It moves along the Z axis which is the direction.
[0009]
A guide rail 430 is provided on the carriage 40, and the tool post 50 is mounted on the guide rail 430. Tool rest, for example, a blade head 52 of the turret type, blade head 52 is indexed about a central axis C _2. The tool rest 50 is moved and controlled along the X axis orthogonal to the Z axis in a plane including the rotation axis C ₁ of the main shaft and the central axis C ₂ of the tool head 52 in a known manner.
The linear ball bearing blocks 410 and 420 mounted on the carriage 40 include balls that circulate inside, and are guided on the linear guide rails 110 and 110 by a roller motion (rolling). Due to the roller motion, the movement speed can be increased and high followability can be ensured.
[0010]
FIG. 3 is an explanatory diagram showing an example of a drive mechanism for the tailstock 60.
The tool post 50 has an arm 510 that is expanded and contracted, and an engaging portion 512 is provided at the tip of the arm 510. The arm 510 is provided with a dock 520. The tail stock 60 has a linear guide block 640 and is guided on the linear guide rail in a manner described later.
A pin 620 is erected on the top of the tailstock 60. When the tail stock 60 moves, the arm 510 of the tool post 50 extends, and the engaging portion engages with the pin 620. When the dock 620 attached to the arm 510 pushes the limit switch 622 on the arm stock side, it is confirmed that the arm 510 of the tool post 50 is engaged with the pin 620 of the tail stock 60.
In this state, the tail stock 60 can be moved in the Z direction by moving the tool post 50 in the Z direction.
[0011]
4 is a side view showing the main part of the structure of the tailstock of the present invention, and FIG. 5 is a left side view of FIG.
The tail stock 60 of the present invention includes a base 62, a spindle 70 mounted on the base 62, a live center 72, and the like. A hydraulic cylinder chamber 630 is provided in the base 62. A hydraulic piston 632 is inserted into the hydraulic cylinder chamber 630, and the tip of the hydraulic piston 632 is engaged with the clamper 634. The linear guide block 640 rolls on the linear guide rail 110 while holding the linear guide rail 110.
[0012]
4 and 5, the hydraulic pressure is supplied to the upper portion of the hydraulic cylinder chamber 630, and the hydraulic piston 632 is biased in a direction protruding from the base 62 of the tailstock 60.
The clamper 634 at the tip of the hydraulic piston 632 is not in contact with the bed.
In this state, the tail stock 60 is in a state in which the lower surface 624 of the base 62 is not in contact with the linear guide rail 110 by the upper spring 650 of the linear guide block 640.
In this state, the tail stock can be moved at a high speed by engaging the tool rest 50 with the tail stock 60 and controlling the movement of the tool rest.
[0013]
6 and 7 show an operation of fixing the tailstock 60 on the linear guide room 110. FIG.
Hydraulic pressure is supplied to the bottom of the hydraulic cylinder chamber 630, raising the hydraulic cylinder 632 to the direction of arrow _{F 1.} The tail stock 60 is lowered, and the lower surface 624 of the base 62 abuts against the upper surface 112 of the linear guide rail 110. A clamper 634 at the tip of the hydraulic piston 632 abuts against the inner side surface 114 of the beddle.
[0014]
Tailstock 60 by the hydraulic force of the hydraulic piston 632 in this state is biased in the direction of the arrow _{F 2,} the lower surface 624 of the base 62 is pressed against the upper surface 112 of the linear guide rail 110 is fixed.
In this state, only the reaction force due to the compression of the spring 650 is loaded on the linear guide block 640, and the load due to the hydraulic pressure is not transmitted.
Therefore, even if the hydraulic pressure for fixing the tail is increased, the rolling balls in the linear guide block 640 are not overloaded with respect to the linear guide rail 110 and are not damaged.
[0015]
【The invention's effect】
As described above, the present invention achieves a high speed movement of the tailstock as a configuration in which the tailstock of the machine tool for which high speed is desired is moved by the linear guide device.
The tailstock needs to securely support the workpiece when fixed, and needs to be clamped on the linear guide rail with sufficient force.
The tailstock is securely clamped on the linear guide rail using a hydraulic mechanism. At the time of clamping, the tailstock and the linear guide block are separated from each other, and no clamping force is applied to the linear guide block, and only the reaction force due to the spring pressure is applied as a load. Therefore, the linear guide mechanism is also protected.
[Brief description of the drawings]
FIG. 1 is a perspective view of a lathe embodying the present invention.
FIG. 2 is an AA arrow view of FIG.
FIG. 3 is an explanatory view showing a drive mechanism of a tail stock.
FIG. 4 is a side view showing the main part of the tailstock.
FIG. 5 is a left side view of FIG. 4;
FIG. 6 is an explanatory diagram showing how the tailstock is fixed.
FIG. 7 is an explanatory diagram showing how the tailstock is fixed.
[Explanation of symbols]
1 NC lathe 10 Bed 20 Main spindle 40 Carriage 50 Tool post 60 Tailstock 62 Base 110 Linear guide rail 630 Hydraulic cylinder chamber 632 Hydraulic pistol 640 Senior guide block 650 Stopper member

Claims (3)

A bed, a headstock mounted on the bed, a linear guide rail disposed on the bed, a carriage having a tool post guided by the guide rail, a tailstock guided by the linear guide rail, and a carriage and means for driving the tail stock has a linear guide block is engaged with the linear guide rail, a hydraulic device for elevating the tailstock, the surface to be abutted on the linear guide rail, the tailstock When moving, it is guided by the linear guide rail only with the linear guide block ,
The turret has an arm with an engaging part at the tip and can be extended and retracted, and a pin is erected on the tailstock. When the tailstock moves, the turret arm extends to engage the turret arm. A lathe equipped with a tailstock that can move the tailstock when the tool post is moved by engaging the pin of the tailstock with the joint. A bed, a headstock mounted on the bed, a linear guide rail disposed on the bed, a carriage having a tool post guided by the guide rail, a tailstock guided by the linear guide rail, and a carriage and means for driving the tail stock has a linear guide block is engaged with the linear guide rail, a hydraulic device for elevating the tailstock, the surface to be abutted on the linear guide rail, the tailstock clamping by supplying hydraulic pressure to the bottom of the hydraulic cylinder chamber provided in the base of the lower tailstock hydraulic piston that is inserted into the hydraulic cylinder is pulled up, the tail stock is lowered, the tailstock Terusuto base of the lower surface is made by being pressed against the upper surface of the linear guide rail Lathe with a click. The lathe with a tail stock according to claim 2, wherein when the tail stock is clamped, a clamping force by the hydraulic device is not transmitted to the linear guide flock by a spring provided on the linear guide block .

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