JP2006247829A - Machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reduction of working accuracy by preventing a bed from being heated by a coolant and to maintain an equipment and an equipment material constituting a state in the sound state in durability by preventing the stage installed on the bed from being exposed to the coolant. <P>SOLUTION: The machine tool 1 is provided, which is provided with the bed 2; the stage 3 mounted on the bed 2 and moving a tool or an object to be worked; and a coolant pan 4 for receiving the coolant blown to the object to be worked and the tool at working of the object to be worked. The coolant pan 4 is arranged with a clearance with the bed 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a machine tool including a coolant pan.

  2. Description of the Related Art Conventionally, in a machine tool, coolant whose temperature is adjusted to a predetermined temperature has been sprayed on a workpiece and a tool that are being processed for the main purpose of cooling frictional heat during processing between the workpiece and a tool. It has been broken. The coolant heated by cooling the frictional heat that is sprayed on the workpiece and tool being processed falls and is received by the coolant pan disposed below, and predetermined according to the inclined surface provided on the coolant pan. It is supposed to be collected by the route.

In a conventional machine tool, a coolant pan is generally configured integrally with a bed on an upper surface of a bed serving as a base of the machine tool (see, for example, Patent Document 1). The bed is a basic part for fixing a stage on which a processing machine and a spindle spindle are mounted, and is usually a cast structure disposed at the lowest level of the machine tool. Therefore, the shape of the upper surface of the bed is devised so that the coolant does not flow outside, and the coolant is efficiently guided to a predetermined drain position with an inclination. Yes.
JP-A-11-151633

However, when the upper surface of the bed is used as a coolant pan like the machine tool disclosed in Patent Document 1, there are the following problems.
First, since the coolant is heated to a high temperature state after cooling the tool and the workpiece, when the coolant pan receiving the coolant is constituted by the upper surface of the bed, the bed itself is heated. There is an inconvenience. When the bed is heated, it is deformed by thermal expansion, so that it is considered that the processing accuracy is lowered.

  Secondly, a stage for moving the processing machine and the spindle spindle device is mounted on the upper surface of the bed. However, when the coolant pan is constituted by the upper surface of the bed, the stage is covered with the coolant. It is necessary to apply. For example, motors that make up the stage and sensors such as cables, connectors, and limit switches connected to the motors may deteriorate or break down if they are exposed directly to the coolant. It is necessary to select a structure or water resistant material. It is also possible to provide a cover so that these devices and equipment are not directly exposed to the coolant.

  However, failure and deterioration cannot be completely prevented even with waterproof and highly water-resistant devices and equipment, and the use of such devices and equipment has the disadvantage of increasing the product cost. Moreover, it is difficult to prevent the coolant from coming into contact with the stage installed on the bed by a cover attached to the bed or the like. Even if the packing is sandwiched and covered with a sheet metal cover, it is difficult to keep the joint between the bed and the cover in a sealed state for a long time due to deterioration of the packing and how the packing is crushed.

  The present invention has been made in view of the above-described circumstances, can prevent the bed from being heated by the coolant, can prevent the processing accuracy from being lowered, and the stage installed on the bed is exposed to the coolant. It is an object of the present invention to provide a machine tool that can prevent the occurrence of the failure and maintain the equipment and equipment constituting the stage in a durable and healthy state.

In order to achieve the above object, the present invention provides the following means.
The present invention includes a bed, a stage that is mounted on the bed and moves a tool or a workpiece, and a coolant pan that receives coolant sprayed against the workpiece and the tool when the workpiece is processed, There is provided a machine tool in which a coolant pan is disposed with a gap between the bed and the bed.

  According to the present invention, the coolant pan that receives the coolant is disposed with a gap between the coolant and the bed, so that even if the coolant heated by cooling the workpiece and the tool is recovered by the coolant pan, It can suppress that the heat of the heated coolant pan is transmitted to the bed. As a result, it is possible to prevent the bed from being thermally deformed and to prevent a reduction in the processing accuracy of the workpiece.

In the above invention, the coolant pan integrally includes a bottom surface portion that receives the coolant and a side surface cover that rises from the bottom surface along the side surface of the stage and covers the side surface of the stage above the bottom surface portion. It is preferable that a gap is provided between the side surface of the stage and the side surface cover.
With this configuration, the coolant received by the coolant pan flows along the bottom surface of the coolant pan, but is prevented from coming into contact with the side surface of the stage by the side cover rising from the bottom surface. Since the bottom surface portion and the side surface portion are provided integrally, the coolant does not leak from between them, and the stage is not exposed to the coolant. In addition, since a gap is provided between the side cover and the side surface of the stage, heat from the side cover is prevented from being transmitted to the stage, and thermal deformation of the stage can be suppressed.

Moreover, in the said invention, it is preferable that the bottom face part of the coolant pan arrange | positioned around the said stage is arrange | positioned in the position higher than the bottom face part of another site | part.
By comprising in this way, the side surface of a stage can be exposed to the side from the clearance gap between a coolant pan and a bed. Various motors that drive the stage, limit switches, linear scales, etc. and their cables are arranged on the side of the stage. By exposing the side of the stage to the side, these devices Maintenance and confirmation can be facilitated. Moreover, it can prevent that a coolant falls down by arrange | positioning the various apparatuses which comprise the said stage outside the coolant pan. Therefore, it is not necessary to select a drip-proof structure or a coolant-resistant material for various devices, and the cost can be reduced.

Moreover, in the said invention, it is preferable that the said coolant pan is provided in a bed so that attachment or detachment is possible in the state fixed to the bed.
By comprising in this way, a coolant pan can be attached after a stage is assembled | attached to a bed. Since the coolant pan has a structure covering almost the entire bed, it is difficult to assemble the stage to the bed after the coolant pan is mounted. Therefore, the ease of assembling can be improved as the stage can be assembled to the bed without the coolant pan attached, and then the coolant pan can be attached to the bed.

Moreover, in the said invention, it is preferable that the said coolant pan is comprised with the metal thin plate.
By comprising in this way, a coolant pan can be reduced in weight and can be attached or detached easily. In particular, when used in a small machine tool, the problem of vibration does not occur even if the coolant pan is made of a thin metal plate.

Moreover, in the said invention, it is preferable that the inclination part formed by inclining the bottom face part of the said coolant pan is provided in the outer peripheral part of the said bed.
By configuring in this way, the inclined portion can guide the coolant from the outer peripheral portion to the inner side, prevent leakage from the outer peripheral portion to the outer side, and provide a space along the outer peripheral portion of the bed below the inclined portion. . As a result, wiring and piping to various devices constituting the stage and wiring and piping to various devices arranged on the stage can be laid without protruding from the bed.

Moreover, in the said invention, it is preferable that the fin for cooling is provided in the outer surface of the said coolant pan.
Since the cooling effect of the coolant pan is promoted by the operation of the cooling fins, further thermal deformation can be prevented.

Furthermore, in the said invention, it is preferable to provide the nozzle which makes a coolant flow on the inner surface of the coolant pan in which the said cooling fin is provided.
By doing in this way, a hot coolant can always be arrange | positioned to the inner surface of the coolant pan in which the fin for cooling is provided, and the efficiency of the thermal radiation through the fin for cooling can be improved. Further, it is not necessary to separately provide a cooling device dedicated to the coolant, and the machine tool can be reduced in size.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that it can prevent that a bed will be heated with a coolant and the fall of a processing precision can be prevented. In addition, it is possible to prevent the stage installed on the bed from being exposed to the coolant, and to maintain the equipment and equipment constituting the stage in a durable and healthy state.

Hereinafter, a machine tool according to an embodiment of the present invention will be described with reference to FIGS.
A machine tool 1 according to the present embodiment includes a bed 2 installed on a floor surface, a stage 3 mounted on the bed 2, and a coolant pan 4 fixed to the bed 2 in FIG. . In the figure, a symbol X is, for example, a spindle spindle device.

  The bed 2 includes a substantially horizontal bed surface plate 5 on which the stage 3 is mounted, a support column 6 that supports the bed surface plate 5, a through-hole 7 that penetrates the bed surface plate 5 in the vertical direction, and the support column 6. And a recovery duct 8 that recovers the coolant that is disposed and guided downward through the through-hole 7. Moreover, in this embodiment, the bed surface board 5 is comprised by casting, for example, and the base 9 which comprises the said stage 3 is formed in the bed surface board 5 integrally.

  As shown in FIG. 3 or 5, the stage 3 is provided at two places on the bed surface plate 5. These two stages 3 are each a uniaxial stage 3, and their operating directions are set to be orthogonal to each other. Each stage 3 drives a linear guide 10 fixed to a pedestal 9 provided on the bed surface plate 5, a slider 11 supported by the linear guide 10 so as to be linearly movable in one axial direction, and the slider 11. And a linear drive mechanism 12. The linear drive mechanism 12 includes, for example, a motor 13 and a ball screw 14 (see FIGS. 1 and 3) that is rotationally driven by the motor 13.

  Further, as shown in FIG. 2, the linear movement mechanism 12 includes a limit switch 15 that detects an operation limit in the axial direction and a linear sensor 16 for position detection. Reference numeral 17 in the drawing is a scale for the linear sensor 16.

  As shown in FIGS. 1 to 4, the coolant pan 4 is a sheet metal structure formed by bending and welding a sheet metal (metal thin plate), and includes a substantially horizontal bottom surface portion 18 and the bottom surface portion 18. And an outer peripheral wall 19 that stands upright in the vertical direction, and is configured in a substantially tray shape that receives coolant falling from above. A boundary portion between the bottom surface portion 18 and the outer peripheral wall 19 is integrally connected without a gap by bending or welding.

  A substantially central portion of the coolant pan 4 is provided at a position coinciding with the through hole 7 of the bed face plate 5 and extends vertically downward from the periphery of the recovery hole 20 for recovering the received coolant. A duct portion 21 to be inserted into the through hole 7 of the bed face plate 5 is provided.

  The coolant pan 4 is provided with two openings 22 for exposing the slider 11 of the stage 3 upward in a state where the coolant pan 4 is fixed to the bed 2. A side cover 23 that rises in the vertical direction from the bottom surface 18 is provided at the periphery of each opening 22, and the side surface 23 covers the side surface of the stage 3 disposed above the bottom surface 18. Yes. The boundary portion between the side cover 23 and the bottom surface portion 18 is integrally connected without a gap by bending or welding.

  Further, the bottom surface portion 18 of the coolant pan 4 is formed so that its height is increased in the vicinity of the opening 22 that exposes the stage 3. That is, it is the lowest in the vicinity of the collection hole 20 arranged at the approximate center, and is formed high around the opening 22 arranged on both sides thereof. As a result, as shown in FIG. 2, a large gap is formed between the coolant pan 4 and the bed 2, whereby the side surface of the stage 3 is exposed between the coolant pan 4 and the bed 2 when viewed from the side. It has been made. Thereby, a space is formed between the coolant pan 4 and the bed 2 around the stage 3. In addition, the bottom surface portion 18 may be provided with a slope that becomes lower toward the recovery hole 20 so that the received coolant does not stay on the bottom surface portion 18.

  1 to 3, the coolant pan 4 is arranged with a gap between the coolant pan 4 and the bed 2 while being fixed to the bed 2. Mounted between the bottom surface portion 18 of the coolant pan 4 and the top surface of the bed surface plate 5, between the duct portion 21 of the coolant pan 4 and the through hole 7 of the bed surface plate 5, and on the side cover 23 and the bed surface plate 5 of the coolant pan 4. It is fixed so that a gap is formed at all positions between the side surfaces of the stage 3.

  The coolant pan 4 and the bed 2 are fixed with a metal fitting 24 provided on the coolant pan 4 on the side surface of the stage 3 with screws 25 or the like. The coolant pan 4 and the side surface of the stage 3 come into contact with each other only at this position, but the coolant pan 4 is arranged in a state where a gap is left between the bed 2 and almost all other portions. It has become.

  Further, as shown in FIG. 1, the coolant pan 4 is provided with an inclined portion 26 having an outer peripheral portion inclined in the vicinity of the recovery hole 20. The inclined portion 26 is inclined so as to gradually descend from the outer peripheral side toward the inner side. As a result, as shown in FIG. 1, a space having a substantially triangular cross section is formed between the coolant pan 4 and the bed surface plate 5 even at the position of the inclined portion 26, and is formed around the two stages 3. Are connected to each other.

  As shown in FIGS. 8 and 9, the slider 11 of the stage 3 is disposed outside the side cover 23 of the coolant pan 4, and covers the entire opening 22 by the movement of the slider 11. A possible upper cover 28 is attached.

The operation of the machine tool 1 according to this embodiment configured as described above will be described below.
To assemble the machine tool 1 according to this embodiment, first, as shown in FIG. 5, the two stages 3 are assembled on the bed surface plate 5. Thereafter, as shown in FIGS. 6 and 7, the coolant pan 4 is assembled from above the bed surface plate 5. The coolant pan 4 is assembled by inserting each stage 3 into the opening 22 of the coolant pan 4 and inserting the duct portion 21 of the coolant pan 4 into the through hole 7 of the bed face plate 5. It can be easily fixed to the bed 2 by screwing to the side surface.

  In the present embodiment, since the coolant pan 4 can be assembled after the stage 3 is assembled on the bed face plate 5 as described above, the coolant pan 4 is an obstacle to the assembly when the stage 3 is assembled. There is an advantage that it is easy to assemble. Moreover, by comprising the coolant pan 4 with a thin metal plate, the weight can be reduced and the ease of assembly can be further improved.

  Further, in the machine tool 1 according to the present embodiment, a gap is formed between the bed 2 and the coolant pan 4 assembled to the bed 2 as shown in FIGS. Even when the coolant pan 4 is heated by receiving the coolant heated by cooling the workpiece and the tool during processing, the heat is prevented from being transmitted to the bed face plate 5 as it is. The coolant received by the bottom surface portion 18 of the coolant pan 4 is prevented from leaking to the outside by the outer peripheral wall 19, and is also prevented from contacting the stage 3 by the side cover 23. Since the boundary portion between the bottom surface 18 of the coolant pan 4, the outer peripheral wall 19 and the side cover 23 is integrally formed without a gap, the coolant does not leak out.

  Then, the coolant is guided to the recovery hole 20 according to the inclination formed in the bottom surface portion 18, passes through the duct portion 21 provided in the recovery hole 20, passes through the through hole 7 of the bed surface plate 5, and is formed in the lower portion of the bed surface plate 5. It is discharged to the collection duct 8 that is arranged. Since the coolant pan 4 is disposed with a gap with respect to the bed 2 and the stage 3 at all positions except for the mounting position to the stage 3, the deformation of the bed face plate 5 and the stage 3 due to the heat of the coolant is prevented. It is possible to prevent the deterioration of processing accuracy.

  Further, according to the machine tool 1 according to the present embodiment, the bottom surface portion 18 of the coolant pan 4 in the vicinity of the stage 3 is disposed so as to be raised one step higher than the bottom surface portion 18 at other positions. As shown in FIG. 4, the side surface of the stage 3 can be viewed from the side. On the side surface of the stage 3, a limit switch 15, a linear sensor 16, or the like that displays the state of the sensor with LEDs or the like is arranged. I can confirm.

  Further, by raising the bottom surface portion 18, a space that is outside the coolant pan 4 is formed around the stage 3. Therefore, it is possible to prevent the sensors 15 and 16 arranged around the stage 3 and devices such as cables and connectors from being exposed to the coolant. As a result, it is not necessary to adopt a drip-proof structure for these devices or to use a material having coolant resistance, and it is possible to select an inexpensive device. Thereby, the cost of the machine tool can be reduced.

In addition, since the inclined portion 26 is provided in the outer peripheral portion in the vicinity of the recovery hole 20, a space having a triangular cross section connecting the spaces formed around the two stages 3 is formed on the outer peripheral edge of the bed surface plate 5. Formed along. Therefore, as shown in FIG. 1, piping for supplying hydraulic pressure and air pressure to the stage 3 and wiring A for supplying electric signals and electric power can be laid using the space. Thereby, piping and the wiring A can be stored so that it may not jump out of the bed surface board 5 outside. In the figure, reference numeral 28 denotes a cover member.
In addition, what is necessary is just to install about the piping and wiring to the various apparatuses mounted in the stage 3 by penetrating the arbitrary positions of the bottom face part 18 of the coolant pan 4, and connector-connecting.

  In the present embodiment, as shown in FIG. 10, cooling fins 30 may be provided on the outer surface of the inclined portion 26 of the coolant pan 4. In the example shown in the figure, the four cooling fins 30 are provided approximately horizontally at intervals in the vertical direction, but the number and form of the cooling fins 30 are not limited at all. The cooling fins 30 may be made of the same material as that of the coolant pan 4, but in that case, the heat radiation efficiency can be further improved by forming the cooling fins 30 with a material having high thermal conductivity such as copper. . Further, only the cooling fin 30 may be changed to a material having high thermal conductivity such as copper. Moreover, it may be comprised integrally with the coolant pan 4 and may be attached with the volt | bolt etc.

  Further, a nozzle 31 for spraying the coolant C onto the inner surface of the inclined portion 26 of the outer peripheral wall 19 is provided in the vicinity of the inner surface of the outer peripheral wall 19 of the coolant pan 4 provided with the cooling fins 30. By doing in this way, the coolant C stored in the vicinity of the outer peripheral wall 19 of the coolant pan 4 is caused to flow, and the coolant C in a high temperature state is always brought into contact with the outer peripheral wall 19 of the coolant pan 4, whereby the coolant pan 4 In addition, the temperature difference between the cooling fins 30 and the outside air can be increased to improve the heat dissipation efficiency. As a result, it is not necessary to separately provide a cooling device dedicated to the coolant, and the machine tool can be reduced in size.

Further, by providing a cooling fan (not shown) for circulating cooling air around the cooling fin 30 and a cooling air blow nozzle (not shown), the heat radiation efficiency may be further improved.
Furthermore, as the cover member 32, a punching metal or the like that facilitates circulation of outside air may be employed.

It is a longitudinal section showing a machine tool concerning one embodiment of the present invention. It is the longitudinal cross-sectional view which looked at the machine tool of FIG. 1 from the direction orthogonal to FIG. It is a top view of the machine tool of FIG. It is a top view which shows the coolant pan of the machine tool of FIG. It is a top view which shows the state which removed the coolant pan from the machine tool of FIG. It is a longitudinal cross-sectional view which shows the state which attaches a coolant pan to the bed of the machine tool of FIG. It is a longitudinal cross-sectional view which shows the state which attaches a coolant pan to the bed of the machine tool of FIG. It is a longitudinal cross-sectional view which shows the state which attached the upper cover to the slider of the machine tool of FIG. It is a longitudinal cross-sectional view which shows the state which attached the upper cover to the slider of the machine tool of FIG. It is a longitudinal cross-sectional view which shows the modification of the machine tool of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Machine tool 2 Bed 3 Stage 4 Coolant pan 18 Bottom part 23 Side cover 26 Inclined part 30 Cooling fin 31 Nozzle

Claims (8)

Bed and
A stage mounted on the bed for moving a tool or workpiece;
A coolant pan that receives coolant sprayed on the workpiece and the tool when machining the workpiece;
A machine tool in which the coolant pan is disposed with a gap between the coolant pan and the bed.   The coolant pan is integrally provided with a bottom surface portion that receives coolant, and a side cover that rises from the bottom surface portion along the side surface of the stage and covers the side surface of the stage above the bottom surface portion; The machine tool according to claim 1, wherein a gap is provided between the side cover and the side cover.   The machine tool according to claim 2, wherein a bottom surface portion of a coolant pan disposed around the stage is disposed at a position higher than bottom surfaces of other portions.   The machine tool according to any one of claims 1 to 3, wherein the coolant pan is detachably provided on the bed in a state where the stage is fixed to the bed.   The machine tool according to any one of claims 1 to 4, wherein the coolant pan is made of a thin metal plate.   The machine tool according to claim 5, wherein an inclined portion formed by inclining a bottom surface portion of the coolant pan is provided on an outer peripheral portion of the bed.   The machine tool according to any one of claims 1 to 6, wherein a cooling fin is provided on an outer surface of the coolant pan.   The machine tool according to claim 7, further comprising a nozzle that causes the coolant to flow on an inner surface of a coolant pan provided with the cooling fin.

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