CN113272098A

CN113272098A - Feeding device of machine tool

Info

Publication number: CN113272098A
Application number: CN202080008407.2A
Authority: CN
Inventors: 高野和雅; 梶川真吾; 矶崎泰佑; 杉田直彦; 木崎通; 柏原翔一
Original assignee: Makino Milling Machine Co Ltd; University of Tokyo NUC
Current assignee: Makino Milling Machine Co Ltd; University of Tokyo NUC
Priority date: 2019-01-18
Filing date: 2020-01-14
Publication date: 2021-08-17
Anticipated expiration: 2040-01-14
Also published as: DE112020000272T5; CN113272098B; JP2020116648A; JP7113431B2; WO2020149268A1

Abstract

A feeder (FS2) for a machine tool, comprising a linear motion rolling guide (L2) and a ball screw mechanism (BS2), wherein the linear motion rolling guide (L2) is arranged between a base member (2) and a movable body (3) and guides the movement of the movable body (3) relative to the base member (2); a ball screw mechanism (BS2) drives a movable body (3) relative to a base member (2), the ball screw mechanism (BS2) has a screw (S2), a nut (N2) and a screw holder (B2), the nut (N2) moves along the screw (S2), the screw holder (B2) is fixed relative to the base member (2) and supports the screw (S2), and a CFRP material (50) is sandwiched between the screw holder (B2) and the base member (2).

Description

Feeding device of machine tool

Technical Field

The present invention relates to a feeding device for a machine tool.

Background

In the field of machine tools, various configurations for reducing vibration have been proposed. For example, patent document 1 discloses an optical scanning laser beam machine as a machine tool. The machine tool includes a bed, a cross member that moves on the bed, a saddle that moves on the cross member, and a machining head supported by the saddle. In this machine tool, CFRP (carbon fiber reinforced plastic) is used as the entire cross beam. With this structure, vibration is reduced while achieving light weight and high rigidity.

[ Prior Art document ]

[ patent document ]

[ patent document 1 ] Japanese patent laid-open No. 2000-263356

Disclosure of Invention

Problems to be solved by the invention

Generally, in a machine tool, various vibrations occur. These include, for example, (1) vibrations due to unbalance of a rotating spindle, (2) vibrations due to intermittent cutting force, (3) vibrations due to regenerative vibration, and (4) vibrations due to reaction force acting on a base member when a moving body starts or stops moving. (1) The main shaft mainly vibrates in the vibrations generated by the unbalance of the rotating main shaft. In addition, (2) the main spindle and the table vibrate due to the intermittent cutting force. In addition, (3) the vibration caused by the regenerative chattering vibration is mainly the tool vibration. These spindles, tables and tools are relatively light in weight and are located at the end of the machine tool. Therefore, the vibrations of these components are unlikely to cause vibrations of large displacements of the base member, such as the bed, the column, and the saddle, which are relatively heavy and located below the weight of the machine tool, at a lower frequency. In contrast, (4) vibration due to reaction force acting on the base member due to the movement of the moving body, the reaction force directly acting on the base member via the rolling guide and the ball screw, and vibration of the base member at a large displacement at a low frequency is likely to be caused. In recent years, high-speed machining is frequently performed, and a moving body moves at high acceleration and high deceleration. Therefore, there are cases where: the base member is vibrated by a reaction force due to the operation of the movable body, and the quality of the processed surface of the workpiece is deteriorated. In dealing with such a problem, it is conceivable to increase the rigidity by making the base member heavy. However, this is not preferable because it increases the weight of the entire machine tool. Further, as in the machine tool of patent document 1, it is also conceivable to use CFRP as the entire moving body such as a beam. However, since the rigidity in directions other than the fiber direction is relatively low in CFRP, the use of CFRP as the entire moving body may cause a reduction in static rigidity.

The invention aims to provide a feeding device of a machine tool, which has high static rigidity and can reduce the vibration displacement of a base member caused by the reaction force when a moving body starts or stops moving.

Means for solving the problems

One aspect of the present disclosure is a feeder device for a machine tool, which guides a movable body with respect to a base member and performs feed driving of the movable body, the feeder device including a linear motion rolling guide that is disposed between the base member and the movable body and guides movement of the movable body with respect to the base member, and a ball screw mechanism; the ball screw mechanism drives the movable body with respect to the base member, and includes a screw, a nut that moves along the screw, and a screw holder that is fixed with respect to the base member and supports the screw, and a CFRP material is interposed between the screw holder and the base member.

In a feeding device for a machine tool according to one aspect of the present disclosure, a CFRP material is sandwiched between a screw holder and a base member of a ball screw mechanism. The present inventors have found that by sandwiching the CFRP material at this portion, the vibrational displacement of the base member due to the reaction force at the time of starting or stopping the movement of the moving body can be reduced without changing the material of the base member or the moving body. Therefore, the vibration displacement of the base member as described above can be reduced while maintaining high static rigidity.

The CFRP material is sandwiched between the linear motion rolling guide and the base member. In this case, the vibration displacement of the base member can be further reduced. In this case, the linear motion rolling guide includes a rail and a carriage that moves along the rail, and the CFRP material is interposed between the rail and the base member or between the carriage and the base member.

The screw holder includes first and second bearing bracket units disposed at intervals along the screw, and the CFRP material is spread over a range including the first and second bearing bracket units. In this case, since the CFRP material is filled between the first and second bearing bracket units without a gap, the vibration displacement of the base member can be further reduced.

The CFRP material includes a plurality of layers each including carbon fibers extending in a predetermined direction, and the plurality of layers are laminated such that the orientation of the carbon fibers is ± 45 ° with respect to the moving direction of the moving body. In this case, the CFRP material has high rigidity with respect to all directions in a plane including the moving direction of the moving body.

The base member is made of aluminum alloy. In this case, the base member can be made lightweight.

[ Effect of the invention ]

According to an aspect of the present disclosure, a feeder device for a machine tool having high static rigidity and capable of reducing a vibrational displacement of a base member due to a reaction force generated when a moving body starts or stops moving can be provided.

Drawings

Fig. 1 is a front view showing a machine tool including a feeding device according to an embodiment.

Fig. 2 is a plan view showing the machine tool of fig. 1.

Fig. 3 is a side view showing the machine tool of fig. 1.

Fig. 4 is an enlarged side view showing the feeding device.

Fig. 5 is an enlarged front view showing the feeding device.

Fig. 6 is a sectional view taken along line VI-VI in fig. 5.

Fig. 7 is a graph showing an example of the experimental results.

Fig. 8(a) is a graph showing the vibration damping state of the aluminum alloy. (b) Is a graph showing the vibration damping condition of the CFRP.

Detailed Description

Preferred mode for carrying out the invention

Hereinafter, a feeding device for a machine tool according to an embodiment will be described with reference to the drawings. The same or corresponding elements are denoted by the same reference numerals, and redundant description thereof is omitted. For easy understanding, the scale of the drawings may be changed.

Fig. 1 is a front view showing a machine tool including a feeding device according to an embodiment. Fig. 2 and 3 are a plan view and a side view respectively showing the machine tool of fig. 1. Referring to fig. 1, a machine tool 100 may be, for example, a vertical machining center. The machine tool 100 may be another machining machine. The machine tool 100 includes a bed 1, a slide 2, a saddle 3, a ram 4, a spindle head 5, a spindle 6, and a table 7. The machine tool 100 may further include other components.

In the present embodiment, the main shaft 6 rotates about a vertical axis Os. In the machine tool 100, the direction Z along the axis Os (may also be referred to as the up-down direction). Referring to fig. 2, in the machine tool 100, the direction in which the slider 2, the saddle 3, the ram 4, and the spindle head 5 are arranged in the horizontal direction is the Y-axis direction (may also be referred to as the front-rear direction). The saddle 3, the ram 4, and the spindle head 5 are located on the front side and the opposite side of the slide 2 is the rear side. Further, in the machine tool 100, a direction perpendicular to the Y-axis direction among the horizontal directions is an X-axis direction (may also be referred to as a left-right direction).

Referring to fig. 1, the bed 1 has a foundation 11 and a body 12. The foundation 11 is disposed on a floor surface of a factory or the like. The main body 12 is disposed above the foundation 11. The main body 12 has a pair of side walls 12a and a ceiling wall 12b spanning an upper portion of the pair of side walls 12 a. The pair of side walls 12a are disposed so as to face each other in the X-axis direction. The top wall 12b joins upper portions of the pair of side walls 12 a.

Referring to fig. 2, the slider 2 rides on the upper face of a pair of side walls 12a of the bed 1. In the present embodiment, the slider 2 is formed of an aluminum alloy for weight reduction. The slide 2 is driven in the Y-axis direction on the bed 1 by a feed device FS 1. That is, in the relationship between the bed 1 and the slider 2, the slider 2 functions as a "moving body" that moves in a predetermined direction (Y-axis direction), and the bed 1 functions as a "base member" that supports the moving body. The feeding device FS1 has 1 or more (a pair in the present embodiment) linear motion rolling guides L1, a ball screw mechanism BS1, and a motor M1.

Referring to fig. 3, a linear motion rolling guide L1 is disposed between the bed 1 and the slide 2, and guides the movement of the slide 2 relative to the bed 1. Each of the linear motion rolling guides L1 includes a rail R1 and 1 or more (a pair in the present embodiment) carriages C1. In the feeder FS1, the rail R1 is fixed to the upper surface of the bed 1 as a "base member", and the carriage C1 is fixed to the bottom surface of the slider 2 as a "moving member".

Referring to fig. 2, the ball screw mechanism BS1 drives the slide 2 with respect to the bed 1. The ball screw mechanism BS1 includes a screw S1, a nut N1, and a screw holder B1. The lead screw S1 is disposed such that the center axis thereof is along the Y-axis direction. The screw holder B1 includes first and second bearing bracket units B1a (only one bearing bracket unit B1a is shown in the figure) disposed at a distance along the screw S1. Each bearing bracket unit B1a includes 1 or more rolling bearings and a bracket that supports the rolling bearings. The first and second bearing bracket units B1a can support both ends of the lead screw S1, for example. The lead screw holder B1 is fixed to the top wall 12B of the bed 1. In other embodiments, the screw holder B1 may include only 1 bearing bracket unit B1a (e.g., the screw S1 may be supported by a cantilever).

The nut N1 moves along the lead screw S1. The nut N1 is fixed with respect to the bottom surface of the slider 2. The motor M1 is coupled to one end of the lead screw S1. The nut N1 and the slider 2 move in the Y-axis direction as the screw S1 is rotated by the motor M1. The Y-axis direction feed of the slider 2 is controlled by an NC device (not shown).

The saddle 3 is mounted on the front face of the slider 2. The saddle 3 is driven in the X-axis direction on the slider 2 by the feed device FS 2. That is, in the relationship between the slider 2 and the saddle 3, the slider 2 functions as a base member, and the saddle 3 functions as a movable member. The feeding device FS2 has 1 or more (a pair in the present embodiment) linear motion rolling guides L2, a ball screw mechanism BS2, and a motor M2.

The linear motion rolling guide L2 is disposed between the slider 2 and the saddle 3, and guides the movement of the saddle 3 relative to the slider 2. Each of the linear motion rolling guides L2 includes a rail R2 and 1 or more (a pair in the present embodiment) carriages C2. In the feeder FS2, the rail R2 is fixed to the front surface of the slider 2 as a "base member", and the carriage C2 is fixed to the rear surface of the saddle 3 as a "moving body".

The ball screw mechanism BS2 drives the saddle 3 with respect to the slider 2. The ball screw mechanism BS2 includes a screw S2, a nut N2, and a screw holder B2. The lead screw S2 is disposed along the X-axis direction. The screw holder B2 includes first and second bearing bracket units B2a (see fig. 5) arranged at intervals along the screw S2. Each bearing bracket unit B2a includes 1 or more rolling bearings and a bracket that supports the rolling bearings. The first and second bearing bracket units B2a can support both ends of the lead screw S2, for example. The spindle holder B2 is fixed with respect to the front face of the slider 2. In other embodiments, the lead screw cage B2 may include only 1 bearing bracket unit B2a (e.g., the lead screw S2 may also be cantilevered).

Referring to fig. 2, the nut N2 moves along the lead screw S2. The nut N2 is fixed with respect to the rear of the saddle 3. The motor M2 is coupled to one end of the lead screw S2. The nut N2 and the saddle 3 move in the X-axis direction as the screw S2 is rotated by the motor M2. The feeding of the saddle 3 in the X-axis direction is controlled by the NC device.

Referring to fig. 3, the ram 4 is mounted on the front of the saddle 3. The ram 4 is driven in the Z-axis direction on the saddle 3 by the feed device FS 3. That is, in the relationship between the saddle 3 and the indenter 4, the saddle 3 functions as a "base member", and the indenter 4 functions as a "movable body". The feeding device FS3 has 1 or more (a pair in the present embodiment) linear motion rolling guides L3, a ball screw mechanism BS3, and a motor M3.

The linear motion rolling guide L3 is disposed between the saddle 3 and the ram 4, and guides the movement of the ram 4 relative to the saddle 3. Each of the linear motion rolling guides L3 includes a rail R3 and 1 or more (a pair in the present embodiment) carriages C3. In the above-described feeders FS1, FS2, the rails R1, R2 are fixed to the "base member", and the carriages C1, C2 are fixed to the "mobile body", whereas in the feeder FS3, the rail R3 is fixed to the rear surface of the ram 4 as the "mobile body", and the carriage C3 is fixed to the front surface of the saddle 3 as the "base member".

The ball screw mechanism BS3 drives the ram 4 with respect to the saddle 3. The ball screw mechanism BS3 may include a screw (not shown) arranged in the Z-axis direction, a nut (not shown) fixed to the ram 4, and a screw holder B3. The screw holder B3 includes first and second bearing bracket units B3a (only one bearing bracket unit B3a is shown in the figure) arranged at intervals along the screw. Each bearing bracket unit B3a includes 1 or more rolling bearings and a bracket that supports the rolling bearings. The first and second bearing bracket units B3a can support both ends of a lead screw, for example. The screw holder B3 is fixed to the front surface of the saddle 3. In other embodiments, the lead screw holder B3 may include only 1 bearing bracket unit B3a (e.g., the lead screw may be supported by a cantilever arm). The motor M3 is coupled to one end of the ball screw.

The nut of the ball screw mechanism BS3 can be configured in the same manner as the nuts N1 and N2 of the ball screw mechanisms BS1 and BS2 described above, and thus the nut and the ram 4 can move in the Z-axis direction as the screw is rotated by the motor M3. The Z-axis direction feed of the ram 4 is controlled by the NC device.

Next, the above-described feeding device FS2 between the slide 2 and the saddle 3 in the machine tool 100 will be described in detail.

Fig. 4 and 5 are an enlarged side view and an enlarged front view of the feeder FS2, respectively. In fig. 4 and 5, for easy understanding, some components (for example, the saddle 3 and the nut N2) are omitted. As shown in fig. 5, in the feeding device FS2, a CFRP (carbon fiber reinforced plastic) material 50 is sandwiched between the lead screw holder B2 and the slider 2.

The CFRP material 50 is spread over a range including the first and second bearing bracket units B2 a. Specifically, in fig. 5, the CFRP material 50 is a 1-sheet plate having a size capable of covering substantially the entire front surface of the slider 2. Thereby, the CFRP material 50 is filled between the first and second bearing bracket units B2a without a gap. Instead, the CFRP material 50 of fig. 5 may be divided into a plurality of plates. Further alternatively, as shown in fig. 6, the CFRP material 50 may be disposed only directly below the first and second bearing bracket units B2a, respectively. In this case, there is a space where the CFRP material is not disposed between the first and second bearing bracket units B2 a.

Referring to fig. 5, the CFRP material 50 includes a plurality of layers. Each layer contains carbon fibers in a predetermined direction. Specifically, the plurality of layers are stacked such that the orientation 51 of the carbon fibers is ± 45 ° with respect to the moving direction (X-axis direction) of the saddle 3. The CFRP material 50 can be fixed relative to the slider 2, for example, by a plurality of bolts 52. The spindle holder B2 can be fixed with respect to the slide 2 by a plurality of bolts 53 together with the CFRP material 50. An adhesive may also be used between the slider 2 and the CFRP material 50 and between the CFRP material 50 and the lead screw holder B2. The specifications of the CFRP material 50 (for example, thickness, modulus of elasticity such as young's modulus, strength such as tensile strength, type of matrix resin, type of carbon fiber, content of carbon fiber, and the like) can be appropriately determined in consideration of various factors such as load related to the CFRP material 50. These specifications can be made of thermosetting resin having a thickness (for example, 1 to 5mm) in which static rigidity is not excessively reduced, orientation (for example, 0 ° or 90 °) having high attenuation in a specific direction, and a high young's modulus, for example, in accordance with the design specifications of a feed shaft of a machine.

Referring to fig. 4, in the feeding device FS2, the CFRP material 60 is also sandwiched between the linearly moving rolling guide L2 and the slider 2. Specifically, in the feeding device FS2, the CFRP material 60 is sandwiched between the rail R2 and the slider 2. The CFRP material 60, which may be, for example, a sheet, may have dimensions that extend over substantially the entire length of the rail R2. Instead, the CFRP material 60 may be divided into a plurality of plates. The CFRP material 60 includes a plurality of layers, which are laminated such that the orientation of the carbon fibers of the CFRP material 60 is ± 45 ° with respect to the moving direction (X-axis direction) of the saddle 3, as in the CFRP material 50 described above.

Referring to fig. 5, the rail R2 can be fixed with respect to the slider 2, for example, by a plurality of bolts 54 together with the CFRP material 60 (not shown in fig. 5). An adhesive may also be used between the slider 2 and the CFRP material 60 and between the CFRP material 60 and the rail R2. The specifications of the CFRP material 60 may be determined as appropriate in consideration of various factors such as the load on the CFRP material 60, and may be similar to the CFRP material 50, for example.

Next, a reaction force acting on the slider 2 when the saddle 3 starts or stops moving will be described.

Fig. 6 is a sectional view taken along line VI-VI in fig. 5. In fig. 6, several components (for example, the motor M2 and the like) are omitted for easy understanding. Fig. 6 shows a state where the saddle 3 stops moving to the right side. In this state, the torque acts on the saddle 3 by inertia so as to rotate the saddle 3 in the counterclockwise direction. Therefore, a downward force F1 acts on the right side carriage C2, and a reverse reaction force RF1 acts on the slider 2. Further, an upward force F2 acts on the left side carriage C2, and a reverse reaction force RF2 in the opposite direction acts on the slider 2. Inertial forces F3 and F4 act on the first and second bearing bracket units B2a from the saddle 3 via the nut N2 and the screw S2, respectively, and reaction forces RF3 and RF4 in opposite directions act on the slider 2. The above reaction forces RF1, RF2, RF3, and RF4 cause the slider 2 to vibrate. In particular, the reaction forces RF3 and RF4 act directly on the slider 2 in the X axis direction via the ball screw mechanism BS2, and tend to cause large displacement vibrations of the slider 2 at low frequencies. In the state where the saddle 3 starts moving to the right side, the reaction forces RF1, RF2, RF3, and RF4 described above and the reaction forces in the opposite direction act on the slider 2.

As described above, the above-described reaction force acts on the slider 2 when the saddle 3X starts or stops moving in the X-axis direction. The vibration of the slider 2 due to such a reaction force does not affect the quality of the machined surface of the workpiece when the tool attached to the spindle 6 is not rapidly fed or idle-cut in contact with the workpiece. However, in some machining operations, when a tool attached to the main spindle 6 contacts a workpiece, the saddle 3 may start or stop movement in the X-axis direction (e.g., angular machining including movement in the X-axis and Y-axis directions by an end mill, scanning machining including movement in the X-axis and Z-axis directions by a ball end mill and repeating periodic feeding in the Y-axis direction, and the like). In such a case, the vibration of the slider 2 due to the reaction force may affect the quality of the machined surface of the workpiece.

In order to solve such a problem, the present inventors have found that the vibration of the slider 2 caused by the reaction forces RF1, RF2, RF3, and RF4 as described above can be reduced by the

CFRP materials

50 and 60 when the CFRP material 50 is inserted between the screw holder B2 and the slider 2 and the CFRP material 60 is inserted between the rail R2 and the slider 2.

Specifically, the present inventors have found that, in the machine tool 100 as described above, when the movement of the saddle 3 in the X-axis direction is stopped, the machine tool 100 has a mode in which the entire structure vibrates at a low frequency (about 30Hz in one example) in the X-axis direction, as shown in fig. 6. To examine this mode, a vibration test was performed in the machine tool 100. Specifically, an acceleration sensor is provided on a tool attached to the spindle 6, and the tip of the tool is vibrated in the X-axis direction. The tests were carried out under the conditions where the

CFRP materials

50 and 60 were provided and under the conditions where the

CFRP materials

50 and 60 were not provided.

Fig. 7 is a graph showing an example of the experimental results. The horizontal axis represents frequency and the vertical axis represents amplitude. As shown in fig. 7, it can be seen that each of the condition Cn1 with the

CFRP materials

50, 60 and the condition Cn2 without the

CFRP materials

50, 60 has a large peak at about 30 Hz. As shown in fig. 7, it can be seen that the peak of condition Cn1 is reduced from the peak of condition Cn2 by the presence of

CFRP material

50, 60. From this result, it is also known that the vibration displacement as a problem can be reduced by the

CFRP materials

50, 60. Further, static loads in the X-axis, Y-axis, and Z-axis directions are applied between the main shaft 6 and the table 7, and displacements of the main shaft 6 are measured, and as a result, differences due to the presence or absence of

CFRP materials

50 and 60 are not observed, and it is confirmed that there is no problem in rigidity.

As described above, in the feed device FS2 of the machine tool 100 according to the embodiment, the CFRP material 50 is sandwiched between the screw holder B2 of the ball screw mechanism BS2 and the slider 2. As described above, the inventors have found that the vibration displacement of the slider 2 due to the reaction forces RF1, RF2, RF3, and RF4 when the movement of the saddle 3 in the X-axis direction is started or stopped can be reduced by sandwiching the CFRP material 50 between the portions without changing the material of the slider 2 or the saddle 3. Therefore, the vibration displacement of the slider 2 can be reduced while maintaining high static rigidity.

In addition, in the feeding device FS2, the CFRP material 60 is sandwiched between the rail R2 of the linearly moving rolling guide L2 and the slider 2. Therefore, the vibrational displacement of the slider 2 can be further reduced.

In the feeding device FS2, the screw holder B2 includes first and second bearing bracket units B2a arranged at intervals along the screw S2, and in the embodiment of fig. 5, the CFRP material 50 is spread over a range including the first and second bearing bracket units B2 a. Therefore, the CFRP material is filled between the first and second bearing bracket units B2a without a gap, and the vibration displacement of the slider 2 can be further reduced.

In the feeding device FS2, the CFRP material 50 includes a plurality of layers each containing carbon fibers in a predetermined direction, and the plurality of layers are laminated so that the orientation 51 of the carbon fibers is ± 45 ° with respect to the moving direction (X-axis direction) of the saddle 3. Therefore, the CFRP material 50 has high rigidity with respect to the omnidirectional direction in the XZ plane including the moving direction of the saddle 3.

In the feeding device FS2, the slider 2 is made of aluminum alloy. Therefore, the weight of the slider 2 and the entire machine tool 100 can be reduced. Conventionally, the slider 2 as the base member is generally made of a heavy cast iron material in order to reduce vibration, but vibration can be reduced by sandwiching the

CFRP materials

50 and 60, and it is not necessary to make the base member heavy. Further, although the Young's modulus is slightly inferior to that of cast iron, a light-weight metal material such as an aluminum alloy can be used.

Since CFRP is a lightweight and highly rigid material, the natural frequency of the structure can be increased. Fig. 8(a) and (b) show vibration damping conditions of the aluminum alloy and the CFRP, respectively. Since the period of the damping condition depends on the natural frequency, the vibration damping performance of a material having a high natural frequency also becomes high. Therefore, in the moving body sandwiching the CFRP material, vibration due to inertial force at the start and stop is suppressed.

The embodiments of the feeding device for a machine tool have been described, but the present invention is not limited to the above embodiments. Various modifications of the above-described embodiments may be made by those skilled in the art. In addition, if it is a person skilled in the art, the features included in 1 embodiment may be incorporated into other embodiments or may be exchanged with the features included in other embodiments as long as the contradiction does not occur.

For example, in the above described embodiment, the

CFRP material

50, 60 is used only for the feeder FS 2. However, in other embodiments, the CFRP material may be used instead of or in addition to the feeder FS1 and/or the feeder FS 3.

Specifically, referring to fig. 2, in the feed device FS1, as described above, the slider 2 functions as a "moving body" that moves in a predetermined direction (Y-axis direction), and the bed 1 functions as a "base member" that supports the moving body. In the case where a CFRP material is used for the feeder FS1, the CFRP material can be sandwiched between the bed 1 and the screw holder B1. Further, the CFRP material may be interposed between the bed 1 and the rail R1. In this case, the vibrational displacement of the bed 1 due to the reaction force when the slider 2 starts or stops moving in the Y-axis direction can be reduced.

Referring to fig. 3, in the feeding device FS3, the ram 4 functions as a "moving body" that moves in a predetermined direction (Z-axis direction), and the saddle 3 functions as a "base member" that supports the moving body. In the case of using CFRP material for the feeder FS3, the CFRP material can be attached between the saddle 3 and the screw holder B3. Further, a CFRP material may be bonded between the saddle 3 and the carriage C3. In this case, the vibration displacement of the saddle 3 due to the reaction force when the indenter 4 starts or stops moving in the Z-axis direction can be reduced.

Description of the symbols

1: bed body (base component)

2: slider (base component, moving body)

3: saddle (base component, mobile body)

4: pressure head (moving body)

50: CFRP material

51: orientation of CFRP Material

60: CFRP material

100: machine tool

B1, B2, B3: lead screw holder

B1a, B2a, B3 a: first and second bearing bracket units

BS1, BS2, BS 3: ball screw mechanism

C1, C2, C3: sliding rack

FS1, FS2, FS 3: feeding device

L1, L2, L3: linear motion rolling guide

N1, N2, N3: nut

R1, R2, R3: track

S1, S2: and a lead screw.

Claims

1. A feeder for a machine tool, which guides a movable body with respect to a base member and feeds and drives the movable body, is provided with a linear motion rolling guide and a ball screw mechanism,

a linear motion rolling guide disposed between the base member and the movable body, for guiding movement of the movable body relative to the base member;

the ball screw mechanism drives the movable body relative to the base member, and includes a screw, a nut, and a screw holder,

the nut is moved along the above-mentioned screw,

a lead screw holder fixed to the base member and supporting the lead screw,

the lead screw holder and the base member sandwich a CFRP material therebetween.

2. The feeding device of a machine tool according to claim 1, wherein a CFRP material is sandwiched between the linear motion rolling guide and the base member.

3. The feeding device of a machine tool according to claim 2,

the linear motion rolling guide has a rail and a carriage moving along the rail,

the CFRP material is sandwiched between the rail and the base member or between the carriage and the base member.

4. The feeding device of a machine tool according to claim 1,

the screw holder includes first and second bearing bracket units spaced apart from each other along the screw,

the CFRP material is spread over a range including the first and second bearing bracket units.

5. The feeding device of a machine tool according to claim 1 or 2, wherein the CFRP material includes a plurality of layers each including carbon fibers in a predetermined direction, and the plurality of layers are laminated such that an orientation of the carbon fibers is ± 45 ° with respect to a moving direction of the moving body.

6. The feeding device of a machine tool according to claim 1, wherein the base member is made of an aluminum alloy.