JP2006026795A - Stopper device for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stopper device capable of shortening the length of a stopper part in the stopper device and easily confirming whether or not it butts. <P>SOLUTION: The stopper device for the machine tool is made to a constitution that a stopper member 12 is internally inserted to a bore 11 provided on a saddle 5, i.e., a movement side and a collision plate 10 fixed to a machine body 1, i.e., a fixed side and positioned at a portion opposed to the stopper member when the saddle 5 comes to a stroke end are installed. Thereby, the length of the stopper part is shortened and the constitution can be simplified. Further, since an ink 14 in the insertion hole 15 is jetted and fixed onto the collision plate 10 when the stopper member 12 butts the collision plate 10 by providing an insertion hole 15 in the stopper member 12 and filling the ink 14 at the inside, existence of trace of the collision can be recognized at a glance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a stopper device for a machine tool provided at the end of a stroke of a moving table that reciprocates along a feed axis of the machine tool.

In general, a machine tool reciprocates along a guide through a feed shaft such as a ball screw by means of a feed shaft drive device such as a motor by using a feed shaft drive device such as a motor, etc. It has become. In addition, the stopper device of the machine tool has an elastic member such as rubber attached to the surface of the plate provided on the fixed side at the stroke end of the moving table. For example, the moving table has a predetermined stroke due to an operator's operation error or motor abnormality. In the case of overrun from the end, the moving table collides with the elastic member, the collision energy is absorbed by the elastic member, and the occurrence of defects such as poor processing accuracy due to damage or displacement of the moving table is suppressed. Yes. Conventionally, Japanese Patent Laid-Open No. 2002-219632 discloses a method of absorbing impact by providing a stopper made of an elastic member on a nut screwed to a feed shaft.
JP 2002-219632 A

As described above, in the method of providing all the stopper devices on the fixed side, it is necessary to increase the length of the elastic member itself in order to increase the amount of strain of the elastic member in order to increase the absorbed energy at the time of collision. There is a problem that the installation space for the stopper device is increased and the size of the machine itself is increased. If the elastic member is shortened to reduce the space, the amount of strain decreases, and the amount of collision energy associated therewith. Therefore, there is a problem that the occurrence rate of defects such as poor machining accuracy due to damage or displacement of the moving table at the time of collision increases. Further, when trouble such as poor machining accuracy occurs in the machine body, there is no means for confirming the trace of collision of the moving body, and there is a problem that the cause cannot be clarified.

The present invention makes it possible to visually check whether or not a moving body has collided with a collision plate in a stopper device of a machine tool as compared with the conventional one, and can easily identify the cause of a defect. An object of the present invention is to provide a stopper device for a machine tool.

In order to solve the above problems, the invention described in claim 1 includes a moving base that reciprocates on a feed shaft and a feed shaft drive device that reciprocates the moving base by driving the feed shaft. In a machine tool, a stopper member is inserted into a hole drilled in the moving table, a collision plate is installed on a fixed side facing the stopper member, and when the moving table exceeds a stroke end, the stopper member is The gist is that the stopper member functions as a cushioning material before it comes into contact with the collision plate and the movable table collides with the collision plate.

The gist of a second aspect of the present invention is that, in the first aspect, the stopper member is made of rubber, synthetic resin or the like and is made of a material rich in elasticity.

According to a third aspect of the present invention, the stopper member includes a hole formed from a surface that first collides with the collision plate, ink or paint filling the hole, and a thin film body covering the surface of the hole. The gist of the invention is that when the moving table collides with the collision plate beyond the end of the stroke, the ink or paint breaks the thin film body and ejects, and the ink or paint adheres to the collision plate.

According to the invention described in any one of claims 1 to 3, since the stopper portion of the moving base can be configured with a simple configuration and the length of the stopper portion itself can be reduced, the overall length of the machine body is also shortened. It is possible.

The invention according to claim 2 can further reduce the space of the entire configuration of the stopper portion by optimizing the configuration of the stopper member itself.

In the invention according to claim 3, in the event of a collision, ink is ejected from the insertion hole inside the stopper member onto the collision plate and adheres to the collision plate, whereby the presence or absence of the collision can be clarified. Since it is easy to pursue, it is easier to deal with problems that occur.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a stopper device for a machine tool embodying the invention will be described with reference to the drawings.
FIG. 1 is a front view of the entire machine tool, and FIG. 2 is a side view of the entire machine tool. The overall configuration of the embodiment of the present invention will be described below with reference to FIGS. Guide rails 2 are installed in parallel with each other on the machine tool base 1, and are also supported on the machine base by a bearing (not shown) so as to be rotatable. A shaft 3 is installed. A feed shaft driving device such as a servo motor (not shown) for rotating the feed shaft is connected to the end extension line of the feed shaft 3.

A plurality of sliders 4 are fixedly attached to the saddle 5 so as to be reciprocally movable on the plurality of guide rails 2. Further, a transmission body such as a nut (not shown) screwed to the feed shaft 3 is fixed to the saddle 5, and when the feed shaft 3 rotates, a rotational motion is caused by the feed shaft 3 and the transmission body. It is converted into a movement in the Z-axis direction, and reciprocates in the Z-axis direction while being guided and supported by the guide rail 2 and the slider 4.

Similarly to the above configuration, the column 7 on the saddle 5 reciprocates in the X-axis direction, and the spindle head 8 that rotatably supports a spindle (not shown) that clamps the machining tool 9 on the column 7 reciprocates in the Y-axis direction. By performing the movement, the workpiece W is moved to a predetermined position, and the workpiece W supported by the jig 6 in the machining area is subjected to predetermined machining by the machining tool 9.

On the fixed side near both ends of each feed shaft on the machine base or moving table that supports each feed shaft of each of the feed shafts of the saddle 5, the column 7 and the spindle head 8 that reciprocate in the respective axial directions. A collision plate 10 is installed. A perforation 11 is formed on the moving side of the saddle 5, the column 7 and the spindle head 8 so as to face the collision plate 10, and a stopper member 12 is installed in the perforation 11 so as to be inserted therein. In this specification, the relationship between the moving side and the fixed side is relative to the saddle 5, the column 7, the perforation 11 on the spindle head 8, and the collision plate 10 at a position facing the stopper member 12. When the relative positional relationship changes due to movement on each axis, the side on which the relative position changes is the moving side, and the side on which the relative position does not change is the fixed side. In this embodiment, the absolute position fluctuates on the fixed side due to the movement of the shaft not related to the collision plate 10 and the stopper member 12, but the relative positional relationship does not fluctuate unless the shaft moves.

Next, FIG. 3 is an enlarged cross-sectional view of the periphery of the stopper portion in which the main part of FIG. 2 is enlarged. The configuration of the stopper portion will be described below with reference to FIG. A perforation 11 is perforated in the saddle 5 that is reciprocally movable on the guide rail 2 installed on the machine base 1 via a slider 4, and a stopper member 12 is inserted in the perforation 11. Further, the collision plate 10 is located at a position facing the stopper member 12 inserted therein, and is fixed to the machine base 1 on the fixed side.

The stopper member 12 is made of a material that can be elastically deformed, and the stopper member 12 is configured such that the stopper member 12 and the collision plate 10 abut in a region where the saddle 5 exceeds the stroke end. Further, since the stopper member 12 is configured to collide with the collision plate 10 earlier than the saddle 5, the stopper member 12 protrudes outside the saddle 5. The stopper 12 itself is provided with a notch 12a at a position located in the middle of the length direction. The insertion hole 15 for inserting ink and the insertion hole 15 are filled with ink 14 near the center of the stopper member, and the inlet portion of the insertion hole 15 is in the form of a thin film covering the surface of the insertion hole 15. A lid member 16 is provided. Further, a pin 13 for preventing the stopper member 12 from coming off is provided in the vicinity of the entrance of the perforation 11.

Next, the movement of the stopper member 12 in the present embodiment at the time of impact buffering will be described with reference to FIG. When the saddle 5 overruns beyond the stroke end due to an operational error or an abnormality in a feed shaft driving device including a motor (not shown), the stopper member 12 first collides with the collision plate 10. At this time, due to the elastic deformation of the stopper member 12 itself, the collision energy at the time of collision is absorbed and the movement of the saddle 5 that has runaway by the collision plate 10 is restricted. At this time, the inside of the insertion hole 15 formed in the stopper member 12 is compressed by the deformation of the stopper member at the time of collision, and the internal pressure of the insertion hole 15 increases. Due to the momentum and the collision at the time of the collision, the lid member 16 is broken or detached, and the ink 14 enclosed in the insertion hole 15 is ejected and adheres to the collision plate 10 to leave a trace of the collision. It is like that.

According to the stopper device of the above embodiment, the following features can be obtained.
(1) In the above embodiment, the perforations 11 are formed in the saddle 5, the column 7 and the head 8 on the moving side, and the stopper member 12 is inserted therein. For this reason, since the length of the stopper portion itself can be made shorter than when the stopper member is provided on the fixed side, the length of the main body can be shortened.

(2) In the above embodiment, the insertion hole 15 is formed in the stopper member 12, and the ink 14 is sealed in the insertion hole 15. Therefore, by checking the collision plate 10, it can be easily understood whether or not there is a trace of the collision, the cause of the malfunction of the machine can be easily pursued, and the location of responsibility becomes clearer.

In addition, you may change this embodiment as follows.
(Circle) in the said embodiment, the surface shape of the collision board 10 can be changed arbitrarily, such as making it rough. As a result, when the ink 14 adheres to the collision plate 10, it is difficult for the ink to drop, and the traces cannot be erased.
If the ink 14 is made of a material that is ejected to the collision plate 10 at the time of collision and the trace remains on the collision plate 10 and does not easily disappear, it can be replaced with another material such as an oil paint.

O The shape and dimensions of the notch 12a can be arbitrarily changed. Thereby, the amount of collision energy that can be absorbed can be easily changed, and the size of the stopper member can be further reduced.
As shown in FIG. 5, the structure in the vicinity of the pin 13 for preventing the stopper member from coming off can be arbitrarily changed, such as screwing the lid 17. This facilitates the work required to replace the stopper member 12.
The material and fixing method of the lid member 16 enclosing the ink 14 can be arbitrarily changed.
○ The feed shaft drive device may be a linear motor, cylinder, or the like.
In the present embodiment, the machine tool is a type in which three axes move. However, the number of moving axes, the direction, and the like can be arbitrarily changed.

The front view of the whole machine. The side view of the whole machine. Sectional drawing which expanded the principal part in this invention. The principal part sectional drawing when a stopper member collides with a collision board. The principal part sectional drawing which shows the modification of this invention. Sectional drawing which shows the principal part which shows the prior art example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Machine stand, 2 ... Guide rail, 3 ... Feed axis, 4 ... Moving body, 5 ... Saddle, 6 ... Jig, 7 ... Column, 8 ... Spindle head, 9 ... Processing tool, 10 ... Impact plate, 11 ... Perforation, 12 ... stopper member, 12a ... notch, 14 ... ink, 15 ... insertion hole, 16 ... lid member.

Claims (3)

In a machine tool provided with a moving base that reciprocates on a feed shaft and a feed shaft drive device that reciprocates the moving base by driving the feed shaft, a stopper member is inserted into a hole drilled in the moving base. A collision plate is installed on the fixed side facing the stopper member, and the stopper member comes into contact with the collision plate when the moving table exceeds a stroke end, and before the moving table collides with the collision plate, A stopper device for a machine tool, wherein the stopper member functions as a cushioning material. 2. The stopper device for a machine tool according to claim 1, wherein the stopper member is made of rubber, synthetic resin or the like and is rich in elasticity. The stopper member according to claim 1 or 2, wherein the stopper member includes a hole formed from a surface that first collides with the collision plate, ink or paint filling the hole, and a thin film body covering the surface of the hole. A stopper for a machine tool, wherein the ink or the paint breaks through the thin film body when the moving table collides with the collision plate beyond the stroke end, and the ink or the paint adheres to the collision plate. apparatus.

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