JP2008023647A - Machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine tool capable of reinforcing vibration resistance when machining without providing an extra attachment. <P>SOLUTION: This machine tool is provided with a bed 1, a machining means 5 provided on the bed 1, and a coolant tank 25 attached to the bed 1 in the lower part of the bed 1 in a state floating from the floor face F where the bed 1 is mounted. The coolant tank 25 has an approximately rectangular parallelepiped shape extending in the front/rear direction of the bed 1. The parts in the both left/right sides in the lower part of the bed 1 are leg parts 1f, and a space between the leg parts 1f is defined as a disposition space 6 of the coolant tank 25. The inside of the coolant tank 25 is provided with a chip conveyor 28 and the chip conveyor 28 is attached to the bed 1 via coolant tank 25 or directly attached thereto. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a machine tool such as a lathe provided with a coolant tank.

Conventionally, a coolant tank of a machine tool is generally installed on a floor surface separately from a main body such as a bed. In addition to this, a coolant tank connected to a bed and installed on the floor surface has been proposed (for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-315097

  Small machine tools inevitably have a small mass. For this reason, there is a problem that vibration during movement of the tool post at high speed and cutting vibration during processing cannot be sufficiently received, resulting in noise due to vibration and deterioration in processing quality. Increasing the mass of the bed by installing a weight or the like is effective for reducing vibrations, but increases the cost for installing the weight, and also reduces the transportability at the time of carrying in.

An object of the present invention is to provide a machine tool capable of enhancing vibration resistance during processing or the like without providing an extra additive.
Another object of the present invention is to eliminate the need for extra space for the installation of the coolant tank, to achieve compactness, and to facilitate the installation of the coolant tank.
Still another object of the present invention is to make it possible to further increase the mass of the bed and further enhance the vibration resistance.

The machine tool according to the present invention includes a bed installed on the floor, processing means provided on the bed, and a coolant tank attached to the bed in a state of being lifted from the floor at the bottom of the bed. .
According to this configuration, since the coolant tank is attached to the bed in a state of being lifted from the floor surface, the mass of the coolant tank and the coolant therein is added to the mass of the bed. Therefore, vibration during movement of the tool post, cutting vibration during processing, and the like are easily absorbed by the bed, and vibration resistance is improved. Thereby, the noise accompanying vibration is reduced, and the reduction in machining quality due to vibration is alleviated, and the machining quality is improved.

In this invention, the coolant tank has a substantially rectangular parallelepiped shape extending in the front-rear direction of the bed, and the lower part of the bed has left and right side portions as leg portions, and the space between the leg portions is an arrangement space for the coolant tank. It is also good.
In the case of this configuration, the space between the leg portions under the bed is the space for arranging the coolant tank, so that no extra space is required for installing the coolant tank, and the overall size of the machine tool can be reduced. Further, since the coolant tank is disposed between the leg portions of the bed, the coolant tank can be easily inserted and removed and installed.
In addition, you may provide the fastening member which fastens a coolant tank to a bed in the bed site | part above the coolant tank installation space. In that case, the coolant tank in the coolant tank installation space can be lifted and fastened as it is, and fastening work can be easily performed.

In the present invention, a chip conveyor may be provided inside the coolant tank, and the chip conveyor may be attached to the bed via the coolant tank or directly.
The chip conveyor is used for discharging chips, and by placing the chip conveyor in a coolant tank and attaching it to the bed, the mass of the chip conveyor is also added as the mass of the bed. Therefore, the mass of the bed can be further increased, and the vibration resistance can be further enhanced.

The machine tool of the present invention includes a bed installed on the floor, processing means provided on the bed, and a coolant tank attached to the bed in a state of being lifted from the floor at the bottom of the bed. Therefore, vibration resistance at the time of processing or the like can be enhanced without providing an extra additive.
When the coolant tank has a substantially rectangular parallelepiped shape extending in the front-rear direction of the bed, the lower part of the bed has left and right side portions as leg portions, and the space between the leg portions is a space for arranging the coolant tank. In addition, no extra space is required for the installation of the coolant tank, making it possible to achieve compactness and easy installation of the coolant tank.
A chip conveyor is provided inside the coolant tank, and when the chip conveyor is attached to the bed via the coolant tank or directly, the mass of the bed can be further increased and vibration resistance is further enhanced. Can do.

  An embodiment of the present invention will be described with reference to FIGS. This machine tool A is composed of a turret lathe, and a movable spindle stock 3 that supports a spindle 2 is installed on a bed 1 so as to be able to advance and retract in the front-rear direction (Z-axis direction). A tool post 4 made of a turret is disposed in front of the turret 4 so as to be movable in the vertical direction (X-axis direction). The tool post 4 is installed below the axis O of the main shaft 3. The main shaft 2 faces in the front-rear direction (Z-axis direction), and a main shaft chuck 2a is provided at the front end. The main shaft 2 and the tool post 4 constitute a processing means 5.

  The bed 1 includes a pair of opposing side surface plate portions 1a, an upper surface plate portion 1b provided at the rear of the side surface plate portion 1a across the upper ends of the side surface plate portions 1a, and front ends of the side surface plate portions 1a on both sides. It has a box shape having a front plate portion 1c that is vertically provided between them. From the front end of the upper surface plate portion 1b of the bed 1, the intermediate standing plate portion 1d extends and extends, and the lower end of the intermediate standing plate portion 1d continues to the bottom plate portion 1e. The intermediate standing plate portion 1d is inclined so that the lower portion is retracted, and the portion where the intermediate standing plate portion 1d and the bottom plate portion 1e continue is a curved plate having an arcuate cross section. A space 26 between the intermediate standing plate portion 1d and the front plate portion 1c of the bed 1 is a processing space in which the tool rest 4 is located and serves as a chip discharge space.

  In the lower portion of the bed, which is a portion below the bottom plate portion 1e of the bed 1, portions near the left and right ends serve as leg portions 1f (FIG. 3), and a space between these leg portions 1f serves as a coolant tank arrangement space 6. The leg portion 1f extends over the entire length in the front-rear direction of the bed 1, and includes a pair of opposing leg side plates 1fa and a leg bottom plate 1fb extending between the lower ends of the leg side plates 1fa.

1 and 2, the head stock 3 is installed on the upper surface plate portion 1 b of the bed 1 so as to be able to advance and retract in the front-rear direction via the main shaft guide means 7. The spindle guide means 7 comprises a pair of front and rear guide rails 7a provided extending in the front-rear direction on both the left and right sides of the headstock 3, and a guided body 7b that is movable back and forth on each front and rear guide rail 7a. The guide body 7b is composed of a linear motion rolling bearing or the like. The front and rear guide rails 7 a are installed on the left and right guide means support bases 8 provided on the upper surface plate portion 1 b of the bed 1. The guided body 7b is attached to the lower surface of the overhanging piece 3a provided so as to protrude from both the left and right side surfaces of the headstock 3, and is provided at two positions on the left and right sides. The height position of the overhang portion 3 a is set to be substantially the same height position as the axis of the main shaft 2.
The headstock 3 includes a bearing that rotatably supports the main shaft 2 and a main shaft motor (not shown) that rotates the main shaft 2, and a drive device 9 that opens and closes the chuck 2 a is installed at the rear part.

  A back-and-forth moving mechanism 10 for moving the headstock 3 back and forth is located below the headstock 3 and is installed on the upper surface plate portion 1 b of the bed 1. The forward / backward moving mechanism 10 includes a spindle advance / retreat drive motor 11 installed on the bed 1 below the headstock 3 and a ball screw 12. The ball screw 12 has a screw shaft rotatably mounted on the bed 1 and connected to the motor shaft of the spindle advance / retreat drive motor 11, and a nut is attached to the lower surface of the headstock 3. The forward / backward movement mechanism 10 may be a linear motor.

  The tool post 4 is formed of a turret, and tools 32 such as a cutting tool and a rotary tool are attached to a plurality of locations on the outer peripheral surface. The tool post 4 is rotatably mounted on the lifting platform 13, and an arbitrary tool 32 is moved to the upper end position corresponding to the spindle 2 by an indexing motor (not shown) built in the lifting platform 13. Indexing is possible. The rotation axis O2 of the tool post 4 is slightly inclined so that the main shaft 2 side faces upward.

  The elevator 13 is installed on the front plate 1c of the bed 1 so as to be movable up and down via the elevator guide means 15, and is moved up and down by an elevator drive mechanism 16 installed outside the front plate 1c. The front plate portion 1c of the bed 1 has an opening 17 extending vertically in the center, and the lifting platform 13 is a portion protruding from the opening to the outer surface of the front plate portion 1c. And drive transmission by the raising / lowering drive mechanism 16 is performed.

  The elevating guide means 15 includes a pair of elevating guide rails 15a and guided bodies 15b that can move back and forth on each elevating guide rail 15a. The guided bodies 15b include linear motion rolling bearings and the like. The elevating guide rail 15 a is provided on the outer surface of the front plate portion 1 c of the bed 1 so as to extend vertically on both sides of the opening 17. The guided body 15b is attached to an overhanging portion 13a that protrudes from the left and right sides of the lifting platform 13, and is provided at two locations on the left and right.

  The lifting / lowering movement mechanism 16 includes a lifting / lowering motor 18 installed on the outer surface of the front plate portion 1 c and a ball screw 19. The screw shaft of the ball screw 19 is rotatably installed on the front plate portion 1 c and connected to the motor shaft of the lifting motor 18, and a nut is attached to the front of the lifting platform 13. The elevating drive mechanism 16 may be a linear motor.

  The raising / lowering moving mechanism 16 and the raising / lowering guide means 15 are accommodated in the protrusion width of the surrounding wall part 1g protruded ahead from the perimeter of the outer periphery of the front plate part 1c of the bed 1.

An upper space where the headstock 3 on the bed 1 is installed is covered with a body cover 19. The body cover 19 has a front door 20 on the front side of the upper surface plate portion 1b of the bed 1, and the front door 20 is provided with an internal peeping window 21.
A control panel 22 for controlling the machine tool is installed along the back surface of the bed 1. The control panel 22 may be attached to the bed 1 via an attachment member (not shown) or may be installed on the floor via a support base (not shown). good.

  A coolant tank 25 is attached to the lower part of the bed 1 so as to float from the floor surface F on which the bed 1 is placed. As described above, the lower part of the bed 1 has left and right side portions as leg portions 1 f, and the space 6 between these leg portions 1 f becomes the arrangement space for the coolant tank 25. The coolant tank 25 has a substantially rectangular parallelepiped box shape extending in the front-rear direction of the bed 1, and has a cross-sectional dimension in which the space 6 between the leg portions 1f is substantially filled.

  The coolant tank 25 extends from the front end to the rear end of the bed 1 and further protrudes from the back of the bed. At the rear end of the coolant tank 25, a circulation motor 27 for circulating the coolant inside is provided. The chip discharge space 26 which is a space between the front plate portion 1c and the intermediate standing plate portion 1d of the bed 1 has a lower surface open, and a portion corresponding to the chip discharge space 26 of the coolant tank 25 is an upper surface. Is open.

  The coolant tank 25 is attached to the bed 1 by, for example, attaching pieces (not shown) provided at a plurality of locations of the coolant tank 25 to the lower surface of the bottom plate portion 1e of the bed 1 or the leg portions 1f on both sides of the bed 1. And a fastening member such as a bolt and a nut (not shown). The coolant tank 25 may be attached to the bed 1 in a suspended state, or a support member provided between the leg portions 1f on both sides of the bed 1 or protruding inward from the leg portions 1f (see FIG. (Not shown).

  A chip conveyor 28 is provided in the coolant tank 25. The chip conveyor 28 is configured to freely rotate an endless conveyor rotating body 29 made of a net or a belt with a hole that passes oil and prevents the passage of chips into a conveyor case 30 via a guide 31 such as a roller. Is provided. The conveyor rotating body 29 is rotationally driven by a conveyor driving motor 31 provided at the rear end of the chip conveyor 28. The conveyor case 30 of the chip conveyor 28 has an open upper surface at a portion corresponding to the chip discharge space 26 of the bed 1. The chip conveyor 28 is formed as an inclined portion 28a in which a portion protruding backward from the bed 1 is inclined upward, and discharges chips of the conveyor rotating body 29 from the upper end of the inclined portion 28a.

  The chip conveyor 28 is attached to the bed 1 via the coolant tank 25 or directly. In this embodiment, the chip conveyor 28 is placed on the bottom surface inside the coolant tank 25, and the coolant tank 25 is attached to the head 1 with this chip conveyor 28 placed.

  FIG. 4 shows a state in which a plurality of machine tools A of this embodiment are installed side by side.

  The machine tool A having this configuration moves in the feed direction and the cutting direction of the tool 32 with respect to a workpiece (not shown) supported by the spindle 2 by moving the spindle stock 3 back and forth and moving the tool post 4 up and down. Is given and processing is performed.

According to this machine tool A, since the coolant tank 25 is lifted from the floor F and is attached to the bed 1, the mass of the coolant tank 25 and the coolant therein is added to the mass of the bed 1. Therefore, vibrations during movement of the tool post 4 and cutting vibrations during processing are easily absorbed by the bed 1 and vibration resistance is improved. Thereby, the noise accompanying vibration is reduced, and the reduction in machining quality due to vibration is alleviated, and the machining quality is improved. In this embodiment, since the chip conveyor 28 is disposed in the coolant tank 25 and attached to the bed 1, the mass of the chip conveyor 28 is also added as the mass of the bed 1. Therefore, the mass of the bed 1 can be further increased, and the vibration resistance can be further enhanced.
As for the arrangement of the coolant tank 25, the space between the leg portions 1f below the bed 1 is the coolant tank arrangement space 26, so that no extra space is required for the installation of the coolant tank 25, and the machine tool A as a whole is more compact. Can be achieved. Further, since the coolant tank 25 is disposed between the leg portions 1f of the bed 1, there is an advantage that the coolant tank 25 can be easily inserted and removed and installed.

  Moreover, according to this machine tool A, since the tool post 4 can be moved in the vertical direction, an occupied floor area for obtaining a moving space of the tool post 4 is not required, and the installation area can be reduced. In this case, since the tool post 4 is disposed in front of the spindle 2, the lateral width of the machine tool A can be reduced from this point. Therefore, coupled with the fact that the floor area for moving the tool post 4 is unnecessary, the lateral width of the machine tool A can be minimized. Therefore, for example, as shown in FIG. 4, when a large number of machine tools A are installed side by side in the factory, the arrangement width can be reduced. In this embodiment, since the center O2 of the turret type tool post 4 is inclined in the front-rear direction, the size of the machine tool A in the front-rear direction is reduced while the tool post 4 is installed in front of the spindle 2. Is done.

  In addition, since the main shaft 2 is movable in the front-rear direction, the movement in one axial direction (Z-axis direction) is shared, and the tool post 4 is movable only in the vertical direction, that is, because each axis is independently installed on the bed 1. In order to make the conventional tool post 4 movable in the directions of two orthogonal axes, the rigidity between the tool post 4 and the main spindle 2 is higher than that of a structure in which the feed stands are stacked in two stages. Therefore, the influence of vibration is reduced, and the processing accuracy and processing quality are excellent. The accuracy itself is superior to that of a conventional feed base having a two-stage structure. Since the inertia force at the time of raising / lowering the tool post 4 is received by the vertical section having a large rigidity in the bed 1, that is, by the front plate portion 1 c, this also reduces the influence of vibration.

Since the bed 1 has a box shape and has a front plate portion 1c in front of the chip discharge space 26, the main shaft 2 is movable in the front-rear direction and the tool post 4 is movable in the vertical direction. As a result, a simple configuration can be obtained.
Moreover, although such a box-shaped bed 1 is used, the tool post 4 is arranged inside the front plate part 1c, and the elevating drive mechanism 16 for driving the tool post 4 is arranged outside the front plate part 1c. Therefore, maintenance of the lifting drive mechanism 16 can be performed from the outside of the machine. Therefore, maintenance work can be performed easily. Although the tool post 4 is inside the front plate portion 1c and is located in the chip generation space 26, since the elevating drive mechanism 16 is outside the front plate portion 1c, from the chip discharge space 26 where chips are generated. There is also an advantage that the elevating drive mechanism 16 is not easily affected by chips or coolant because it is blocked by the front plate portion 1c.

  Furthermore, since the front door 20 is located above the tool rest 4 in the machine tool A, maintenance work such as tool replacement for the tool rest 4 can be easily performed. The bed 1 has a box shape, and has a chip discharge space 26 therein, and a chip conveyor 28 extending rearward from the chip discharge space 26 is provided. When a plurality of machines A are arranged side by side, the chip conveyor 28 does not interfere with the arrangement, and the arrangement width can be reduced.

  In addition, although the said embodiment demonstrated about the case where it applied to a lathe, this invention is applicable also to a grinding machine etc.

It is a fracture side view of a machine tool concerning one embodiment of this invention. It is a top view of the machine tool. It is a front view of the machine tool. It is a front view which shows the state which arranged the multiple machine tools side by side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bed 1a ... Side surface plate part 1b ... Upper surface plate part 1c ... Front plate part 1d ... Middle standing plate part 1e ... Bottom plate part 1f ... Leg part 2 ... Main axis 3 ... Main frame 4 ... Turret base 5 ... Processing means 6 ... Coolant Tank arrangement space 7 ... Spindle guide means 9 ... Chuck opening / closing drive device 10 ... Previous moving mechanism 13 ... Elevating platform 15 ... Elevating guide means 16 ... Elevating drive mechanism 17 ... Opening 25 ... Coolant tank 28 ... Chip conveyor A ... Machine tool F ... Floor O ... Spindle axis O2 ... Turret axis of rotation

Claims (3)

  A machine tool comprising a bed installed on a floor, processing means provided on the bed, and a coolant tank attached to the bed in a state of being lifted from the floor at a lower portion of the bed.   The coolant tank has a substantially rectangular parallelepiped shape extending in the front-rear direction of the bed, and the lower part of the bed has left and right side portions as leg portions, and the space between the leg portions serves as an arrangement space for the coolant tank. Item 1. The machine tool according to Item 1. The machine tool according to claim 1, wherein a chip conveyor is provided inside the coolant tank, and the chip conveyor is attached to the bed via the coolant tank or directly.

Images