JPH11226841A - Expandable bellows device in machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce impact at the time of collision of cover bodies as much as possible so as to suppress vibration and noise by providing a plurality of cover bodies on one side of a machining device part and providing an impact reducing member for preventing the collision of one cover body against the other cover body at the time of expansion, shrinkage, and travel in one cover body. SOLUTION: Since each cover body 4,..., 4 is pushed in such a way that it is superposed and slide members collide against each other lastly when a machining device part 3 slides in the direction of an end part 2a of a table 2, an impact reducing member 6 is provided to prevent their mutual collision. This impact reducing member 6 is composed of a plate spring member attached to the slide member. Both sides of a fixed part in which a central part of the plate spring member is fixed on the slide member become free end parts, which are interposed between cover bodies 4 when they collide against each other to prevent their collision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a telescopic bellows device for a machine tool. More specifically, the present invention relates to an improvement in a telescopic movement mechanism of a telescopic bellows device.

[0002]

2. Description of the Related Art Machine tools 101 such as machining centers
In some cases, as shown in FIG. 4, a part thereof is provided so as to be able to linearly move, such as a processing device unit 103 that linearly moves on a table 102. In this case, table 10
2, a plurality of cover members 104,..., 104 formed of a steel plate to protect members such as a motor, a ball screw, and a linear guide provided in the inside from chips, cutting oil, and the like.
May be used as a table cover so as to extend and contract so as to follow the processing device.

The elastic bellows device 105 expands and contracts as a result of sliding of each of the covers 104,..., 104, and is provided, for example, in a stepped manner so as to cover the upper surface of the table 102 and the like. . Each of the covers 104,..., 104 is provided such that its movable range is limited by contacting the adjacent cover 104. The elastic bellows device 105 in which a steel plate is used as the cover body 104 has excellent heat resistance and high durability, and is used in a place where chips or cutting oil is directly applied.

On the other hand, with the pursuit of higher efficiency machining in recent years, the machine tool 101 is required to have a higher machining speed as well as a higher machining accuracy. Therefore, in order to realize a high speed, an increase in the feed speed of the processing device unit 103 is attempted.

[0005]

However, when the processing device section 103 is operated at a high speed, the elastic bellows device 105 made of a heavy steel plate causes an impact when the covers 104,. There is a problem that becomes large. In this case, vibration and noise increase, and there is a possibility that reliability may be reduced, for example, a problem may occur in processing accuracy during machine operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a telescopic bellows device for a machine tool capable of performing a high-speed telescopic movement while minimizing the impact at the time of collision between the cover members and suppressing vibration and noise.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a machining device section slid by a drive source is provided on a table of a machine tool, and an end of the table and a machining device section are provided. In between, the telescopic bellows device in the machine tool provided with a telescopic bellows device consisting of a plurality of telescopic cover body so that the upper surface of the table is covered, the telescopic bellows device is provided with a plurality of In addition to being provided with a cover body, the cover body is provided with an impact relaxation member for preventing collision with another cover body during expansion and contraction movement.

Therefore, when the telescopic bellows device expands and contracts in accordance with the sliding movement of the processing device, the shock absorbing member interposed between the cover members absorbs and relaxes the momentum of the sliding cover member. Prevent collisions with each other.

According to a second aspect of the present invention, the cover body is provided on a base portion side of the cover portion that covers the upper surface of the table, a wiper member attached to a tip of the cover portion, and a cover portion. And a shock absorbing member attached to the sliding member. Therefore, the cover body is prevented from colliding with each other by the collision mitigation member, and always covers the table upper surface following the sliding movement of the processing device.

According to a third aspect of the present invention, the shock absorbing member is constituted by a leaf spring member. Since the leaf spring members are interposed between the cover bodies that are going to collide with each other, the impact is absorbed and reduced by the elastic force, and the collision between the cover bodies is prevented.

According to a fourth aspect of the present invention, the leaf spring member has a fixed portion fixed to the slide member and a free end, and the free end receives an impact of another cover body. When it is received, it comes into contact with the slide member to increase the shock absorbing action. in this case,
The leaf spring member was initially bent between the fixed portion and the free end portion to attenuate the impact when the cover body abutted, and further bent further so that the free end portion was in contact with the slide member. After that, the elastic force of the free end itself is added to the shock absorbing action,
The impact of the cover body can be gradually reduced.

According to a fifth aspect of the present invention, there is provided a telescopic bellows device for a machine tool, wherein at least three covers are provided on one side of the processing device, and a cover intermediate between the three covers is provided on both sides of the cover. The shock absorbing members for the located cover members are individually provided. Therefore, the impact between the intermediate cover body and the cover bodies located on both sides is reduced, and the collision between these cover bodies is prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an example of an embodiment shown in the drawings.

1 to 3 show one embodiment of a telescopic bellows device in a machine tool according to the present invention. The machine tool 1 according to the present embodiment is provided with a processing unit 3 that is slid by a driving source on the table 2, and further, an upper surface 2 b of the table 2 is provided between the end 2 a of the table 2 and the processing unit 3. A plurality of extendable cover bodies 4 so as to be covered
Is provided. The telescopic bellows device 5 is provided on both sides of the processing device unit 3 that can slide in both directions linearly so as to cover the upper surface 2b of the table 2, and expands and contracts as the processing device unit 3 slides. This prevents foreign matter such as cutting chips and cutting oil from entering the interior of the device.

As shown in FIG. 1, a telescopic bellows device 5 includes a plurality of cover members 4,.
And expands and contracts by changing the overlapping area in each of the cover bodies 4,..., 4. in this case,
The cover body 4 is, as shown in FIG.
, A wiper member 42 attached to the tip of the cover portion 41, and a slide member 43 provided on the base side of the cover portion 41. At least one cover body 4 is provided on one side of the processing device section 3.

The shape of each cover is such that, when the telescopic bellows device 5 is fully extended, the wiper member 42 at the tip of the cover body 4,. It is formed so as to have a slightly overlapping portion, and is formed to be wider than the portion of the table 2 to be covered in the width direction. Therefore, the telescopic bellows device 5 always covers the upper surface 2b of the table 2 irrespective of the position where the processing device unit 3 slides. Of the plurality of cover bodies 4, the one located on the inner side (base side) closest to the processing device unit 3 is directly or indirectly fixed to the processing device unit 3 so as to slide together with the processing device unit 3. Those located on the outside are fixed to the end 2a of the table 2.

The cover part 41 of the cover body 4 is a member formed of a steel plate, and as shown in FIG.
Are provided so as to overlap in a stepwise manner in the sliding direction. The cover portion 41 includes the wiper member 4
The cover 2 is formed from an elastomer such as a rubber material so that the cover members 4,..., 4 can be brought into contact with each other so as to be in close contact with each other. Wiper member 42 here
Is formed in a shape provided with dust as shown in FIG. 2,
The cover body 4 located immediately below the cover body 4 is kept in contact with the upper surface of the cover portion 41 and can prevent foreign matter from entering. The shape of the wiper member 42 is not particularly limited to this, but the wiper member 42 must have a shape capable of making light and smooth sliding contact while maintaining contact with the upper surface of the cover portion 41 and having excellent wear resistance. Needless to say, is preferred.

As shown in FIG. 2, the cover 41 is provided with a slide member 43 extending in the vertical direction.
And the cover body 4 is formed so as to be L-shaped when viewed from the side in the sliding direction. At the lower end of the slide member 43, a member 9 that slides on the upper surface 2b of the table 2 is provided.
The slidability with respect to is improved. This sliding member 9
Is, for example, brass. As shown in FIG. 1, the slide member 43 is formed such that the length in the vertical direction is gradually shortened toward the distal end side in order to keep each of the cover portions 41 overlapping with a step substantially parallel to each other. I have. The upper end of the slide member 43 is formed with a protruding portion 44 protruding above the upper surface of the cover portion 41 so as to be able to engage with the inner portion of the wiper member 42 of the cover body 4 provided adjacently. . Therefore, when the processing device unit 3 slides away from the end 2a of the table 2, each of the slide members 43,.
4 is engaged with the lower end of the wiper members 42,.
4 slides and the telescopic bellows device 5 extends.

On the other hand, the cover body 4 has a shock absorbing member 6 for preventing the cover body 4 from colliding with another cover body 4 during the expansion and contraction movement.
Is provided, so that the impact at the time of contact is reduced. That is, in FIG. 1, when the processing device section 3 slides in the direction of the end 2a of the table 2, the cover members 4,..., 4 are pushed in so as to overlap each other, and finally the slide members 43,. Since the collisions occur one after another, the shock absorbing member 6 is provided to prevent the collision at this time. In the present embodiment, the shock absorbing member 6 is constituted by the leaf spring member 7 attached to the slide member 43. In this case, the leaf spring member 7 is bent into a concave shape as shown in FIG. 3, and the central portion is fixedly attached to the slide member 43 so that both sides thereof float. Therefore, the central portion of the leaf spring member 7 is a fixing portion 7a fixed to the slide member 43, and both sides are free ends 7b. When the cover members 4 collide with each other, they intervene between them to prevent the collision. That is, when another cover body 4 adjacent to the cover body 4 to which the leaf spring member 7 is attached slides and approaches, the other cover body 4
First, the slide member 43 is a free end portion 7b of the leaf spring member 7.
The free end 7b is bent and bent as shown by the imaginary line A in FIG. At this time, while being bent, the leaf spring member 7 presses the other cover body 4 by the elasticity thereof in a direction opposite to the sliding direction to reduce the impact. When the cover members 4,..., 4 approach each other and are bent further, the leaf spring member 7 has its free end 7
In order to make b contact the surface of the slide member 43, its elasticity is increased (the imaginary line B in FIG. 3). In this case, the collision between the cover bodies 4 is prevented because the leaf spring member 7 increases the shock absorbing action. Thus, the shock absorbing member 6 using the leaf spring member 7 has a structure in which the state where the spring force is weak is changed to the state where both ends are strong, and the shock is gradually reduced.

Further, the slide member 43 of the cover body 4 is provided with another shock absorbing member 8. As shown in FIGS. 1 and 2, the shock absorbing member 8 is provided so as to be interposed between the slide member 43 and the wiper member 42 of the adjacent cover body 4. Impact relaxation member 8
Is composed of a leaf spring member, for example, as shown in FIG.
Like the shock absorbing member 6, the sliding member 4 faces the distal end side.
3 and has its free end protruding from the upper surface of the cover portion 41. Therefore, each cover body 4, ...,
When 4 slides to the distal end side, cover members 4,.
Between them to prevent them from colliding. That is, when each of the cover members 4 slides toward the distal end side, the wiper member 42 of the cover member 4 adjacent to the shock absorbing member 8 slides on the cover portion 41 to approach and comes into contact with the leaf spring member 7. The impact is reduced. The shock absorbing member 8 bent in this manner, like the shock absorbing member 6 described above, has its free end 8b in contact with the surface of the slide member 43, so that its elastic force is increased to increase the shock absorbing effect. Accordingly, the impact can be absorbed to prevent the collision between the cover members 4 and 4. In order to make the free end 8b protrude from the upper surface of the cover 41,
For example, a notch may be provided at an end in the width direction of the cover 41, or a through hole may be provided at the center. Alternatively, the slide member 4 can be provided without providing these cutouts or through holes.
A leaf spring member provided laterally on the third protrusion 44 may be used as the shock absorbing member 8.

In the above-described embodiment, the shock absorbing members 6,..., 6 and the shock absorbing members 8,. How to attach the members 6 and 8 is not limited to this. For example, although not shown, at least one of the at least three cover members 4 provided on one side of the processing device portion 3 is provided with an impact absorbing member 6 for the cover members 4 located on both sides thereof. Each may be provided separately. That is, the shock absorbing member 6 in this case is used.
Are provided on the front side and the base side with respect to one cover body 4 so as to be back-to-back, so as to alleviate the impact when coming into contact with the adjacent cover bodies 4. In this case, the shock absorbing member 6 includes the cover members 4,.
Are provided, a large number of slide members 43,.
It is sufficient that every other number 43 is provided.

In the telescopic bellows device 5 of the machine tool 1 configured as described above, since the shock absorbing members 6, 8 are attached to the contact surfaces between the covers 4, 4, the telescopic bellows device 5 is extended. The impact can be reduced both at the time of contraction and at the time of contraction. Therefore, the speed of the machine tool 1 can be increased while reducing the vibration and noise during the operation of the machine and maintaining the processing accuracy. In addition, these shock absorbing members 6 and 8 are leaf spring members 7.
Since it can be formed by such a method, the cost does not increase, and it is relatively easy to attach to existing equipment.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, the shock absorbing members 6, 8 in the present embodiment
Are provided so as to absorb the shock between the cover members 4,..., And absorb the shock to prevent the collision. However, the condition is that the contact between the cover members 4, 4 is necessarily prevented. It is not something to be said. That is, the shock absorbing member 6,
Since the size of the shock buffering action 8 can be changed by the elastic force of the spring used, it is inevitable that the cover members 4 and 4 come into contact with each other depending on the relationship with the magnitude of the impact. Although it is possible, the reduction of the impact sound and the vibration, which is the object of the present invention, can be realized even if the cover members 4 come into contact with each other. Therefore,
The magnitude of the buffering force of the shock absorbing member 6 can be appropriately changed depending on the weight of the cover body 4 and the moving speed of the processing device section 3 and the like.

In this embodiment, the leaf spring member 7 has been described as the shock absorbing member 6, but other elastic members such as a wound spring member or an elastomer member may be used instead. Needless to say, the impact can be reduced.

(Example) In a machining center normally operated at a speed of up to 24 m / min,
When the machine was operated at a feed rate of / m / min or more, the noise and vibration caused by the impact increased, whereas in the machining center employing the present invention, 40 m / min.
It worked without problems even at a moderate feed rate. Therefore, by employing the present invention, the speed of the machining center can be increased by 60% or more.

[0026]

As is apparent from the above description, in the telescopic bellows device of the machine tool according to the first aspect of the present invention, the telescopic bellows device is provided so as to have a plurality of covers on one side of the processing device portion. In addition, since the cover body is provided with an impact relaxation member for preventing collision with another cover body during the expansion and contraction movement, the shock when the cover bodies of the expansion and contraction bellows device come into contact with each other can be reduced to reduce the impact between the cover bodies. Collision can be prevented. Therefore, even if the machine tool is operated at a higher speed, the vibration and noise of the telescopic bellows device can be reduced and the telescopic bellows can be telescopically moved at a high speed.

Further, in the telescopic bellows device for a machine tool according to the second aspect of the present invention, the cover body includes a cover for covering the upper surface of the table, a wiper member attached to a tip of the cover, and a base for the cover. Since the slide member is provided, and the shock absorbing member is attached to the slide member, it is possible to reduce the impact of the cover body and prevent collision with each other. Therefore, vibration and noise in the telescopic bellows device can be reduced.

Further, in the telescopic bellows device for a machine tool according to the third aspect of the present invention, since the shock absorbing member is constituted by a leaf spring member, the leaf spring member is interposed between the cover members to provide elasticity. The force can mitigate the impact. Therefore, collision between the cover bodies can be prevented.

According to a fourth aspect of the present invention, the leaf spring member has a fixed portion fixed to the slide member and a free end, and the free end is formed of another cover body. It is designed to contact the slide member when receiving an impact to increase the impact mitigation effect, so the impact when the covers are in contact with each other is gradually reduced, preventing the covers from colliding with each other. can do.

According to a fifth aspect of the present invention, there is provided a telescopic bellows device for a machine tool, wherein at least three cover members are provided on one side of the processing device, and a cover member intermediate the three cover members is provided with the cover member. Since the shock absorbing members for the cover bodies located on both sides are individually provided, the impact between the intermediate cover body and the cover bodies located on both sides is reduced, and these cover bodies are prevented from colliding with each other. be able to.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a telescopic bellows device in a machine tool according to the present invention, showing one side of a processing device portion.

FIGS. 2A and 2B are diagrams showing a cover body constituting the telescopic bellows device, wherein FIG. 2A is a front view and FIG. 2B is a partial side view.

3A and 3B are three views showing a leaf spring member provided as an impact relaxation member, wherein FIG. 3A is a rear (front) view, FIG. 3B is a side view, and FIG. 3C is a bottom (plan) view.

FIG. 4 is a schematic front view showing a machine tool using a conventional telescopic bellows device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machine tool 2 Table 2a End part 2b Upper surface 3 Processing device part 4 Cover body 5 Telescopic bellows device 6 Shock absorbing member 7 Leaf spring member 7a Fixed part 7b Free end 8 Shock absorbing member 41 Cover part 42 Wiper member 43 Slide member

Claims (5)

[Claims] 1. A processing device section slid by a driving source is provided on a table of a machine tool, and a plurality of telescopic units are provided between an end of the table and the processing device section so as to cover an upper surface of the table. In a telescopic bellows device in a machine tool provided with a telescopic bellows device comprising a cover body, the telescopic bellows device is provided so as to have a plurality of cover bodies on one side of the processing device part, and the cover body An extendable bellows device for a machine tool, comprising: a shock absorbing member for preventing a collision with another cover body during an extendable movement. 2. The slide body, comprising: a cover portion that covers the table upper surface; a wiper member attached to a tip of the cover portion; and a slide member provided on a base side of the cover portion. The telescopic bellows device for a machine tool according to claim 1, wherein the shock absorbing member is attached to a member. 3. The telescopic bellows device for a machine tool according to claim 1, wherein said shock absorbing member comprises a leaf spring member. 4. The leaf spring member has a fixing portion fixed to the slide member and a free end, and the free end abuts on the slide member when receiving an impact of another cover body. 4. The telescopic bellows device for a machine tool according to claim 3, wherein the impact reducing effect is increased by contact. 5. At least three sides on one side of the processing device part
5. The apparatus according to claim 1, wherein two cover bodies are provided, and the shock absorbing members for the cover bodies located on both sides of the three cover bodies are individually provided in a cover body between the three cover bodies. A telescopic bellows device in the machine tool according to any one of the above.