JP2014176951A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool capable of suppressing transmission of vibration caused between a first working section and a second working section.SOLUTION: A machine tool comprises: a bed body 4; a first working section 8 disposed on one side part 6 of the bed body 4; and a second working section 12 disposed on the other side part 10 of the bed body 4. The first working section 8 comprises: a first main spindle part 14 for supporting a first main spindle; and a first tool support part 16 for supporting a first working tool. The second working section 12 comprises: a second main spindle part 30 for supporting a second main spindle; and a second tool support part 32 for supporting a second working tool. Between the one side part 6 of the bed body 4 for supporting the first working section 8 and the other side part 10 of the bed body 4 for supporting the second working section 12, a vibration suppression space 70 for suppressing transmission of vibration is provided. In the vibration suppression space 70, it is preferable that a vibration suppression member such as sand is filled.

Description

  The present invention relates to a machine tool that processes a workpiece using a processing tool.

  In an NC lathe as an example of a machine tool, a bed main body installed on a factory floor, a first processing unit provided on one side of the bed main body, and provided on the other side of the bed main body. What comprises a 2nd process part is known (for example, refer patent document 1). In such a machine tool (for example, an NC lathe), the first processing unit includes a first main shaft portion for supporting the first main shaft and a first tool support disposed so as to face the first main shaft portion. A workpiece is mounted on the first main spindle via first chuck means, and the first processing tool is attached to the first tool support portion via, for example, first turret means. The second processing section includes a second main shaft portion for supporting the second main shaft, and a second tool support portion disposed to face the second main shaft portion, and the second main shaft has a second chuck. The workpiece is mounted through the means, and the second processing tool is attached to the second tool support portion through, for example, the second turret means.

  Moreover, in such a machine tool (for example, NC lathe), a workpiece conveyance device may be provided to automatically process the workpiece. Such a workpiece transfer apparatus includes a plurality of support columns supported by a bed body of a machine tool, a moving support member provided between the support columns, and a holding unit that reciprocates along the moving support member. The workpiece before processing is held by the holding unit, is carried into the first processing section (second processing section), is attached to the first chuck means (second chuck means), and has been processed. The object is held by the holding unit, removed from the first chuck means (second chuck means), and unloaded from the first processing section (second processing section).

Japanese Patent Laid-Open No. 11-58172

  However, such machine tools (for example, NC lathes) have the following problems to be solved. First, since the bed body of the machine tool is integrally formed, if the workpiece is processed at the same time in the first and second processing portions, vibrations generated during processing in the first processing portion are generated. The vibration propagated to the second processing portion through the bed main body and thus propagated may adversely affect the processing in the second processing portion, and vibrations generated during processing in the second processing portion may also occur in the bed. The vibration propagated to the first processing portion through the main body and thus propagated may adversely affect the processing at the first processing portion. As a result, the first and second vibrations are propagated through the bed main body. It becomes difficult to process the workpiece with high accuracy in the second processing portion.

  The same thing also occurs in connection with the workpiece transfer device. That is, when the movement of the holding unit in the workpiece transfer device and the processing in the first processing unit (and / or the second processing unit) are performed simultaneously, vibration from the workpiece transfer device causes the plurality of columns and the bed main body to move. The vibrations propagated through the first processing unit (and / or the second processing unit) through the first processing unit (and / or the second processing unit) may adversely affect the processing in the first processing unit (and / or the second processing unit).

  The objective of this invention is providing the machine tool which can suppress propagation of the vibration via the bed main body between a 1st process part and a 2nd process part.

  Another object of the present invention is to provide a machine tool capable of suppressing the propagation of vibrations generated in the workpiece transfer device to the bed body.

The machine tool according to claim 1 of the present invention includes a bed main body, a first processing portion provided on one side portion of the bed main body, and a second processing portion provided on the other side portion of the bed main body. And the first machining part includes a first spindle part for supporting the first spindle and a first tool support part for supporting the first machining tool for machining the first workpiece. In the machine tool provided with the 2nd main axis part for supporting the 2nd main axis, and the 2nd tool support part for supporting the 2nd processing tool which processes the 2nd work piece, the 2nd processing part,
Between the one side part and the other side part between the one side part of the bed main body supporting the first processing part and the other side part of the bed main body supporting the second processing part. A vibration suppression space for suppressing vibration propagation is provided.

  In the machine tool according to claim 2 of the present invention, the first main shaft portion is disposed on the inner side of the one side portion of the bed body, and the second main shaft portion is disposed on the inner side portion of the other side portion. An intermediate portion of the bed main body is provided between the adjacent first main shaft portion and the second main shaft portion, and the vibration suppression space is provided in the intermediate portion.

  In the machine tool according to claim 3 of the present invention, the one side portion of the bed body is provided with a first coolant space for circulating coolant corresponding to the first main shaft portion. The second side portion of the bed main body is provided with a second cooling liquid space for circulating a cooling liquid corresponding to the second main shaft portion, and a part of the intermediate portion of the bed main body includes the second cooling liquid space. A communication space that communicates the first cooling liquid space and the second cooling liquid space is provided, and the vibration suppression space is provided in the other part of the intermediate portion of the bed body.

According to a fourth aspect of the present invention, there is provided a machine tool comprising a bed main body and a processing portion provided on the bed main body, the processing portion including a main shaft portion for supporting the main shaft, and a workpiece. In a machine tool provided with a tool support for supporting a processing tool for processing an object,
A workpiece transfer device for loading and unloading the workpiece to and from the processing unit is provided, and the workpiece transfer device is provided between the plurality of support columns supported by the bed body and the plurality of support columns. And a holding unit that reciprocates along the movement support member, and at least one of the plurality of columns is provided with a vibration suppression space for suppressing vibration propagation. It is characterized by that.

  The machine tool according to claim 5 of the present invention is characterized in that the vibration suppression space is filled with a vibration suppression member for suppressing vibration propagation.

  Furthermore, in the machine tool according to claim 6 of the present invention, the vibration suppressing member is composed of any one of a metal granular member, a ceramic granular member and granular sand, or a mixture thereof. The machine tool according to claim 4.

  According to the machine tool of the first aspect of the present invention, vibration propagation is suppressed between one side portion of the bed main body supporting the first processing portion and the other side portion of the bed main body supporting the second processing portion. Vibration suppression space is provided to suppress the propagation of vibration from the first processing unit to the second processing unit through the bed body, and thereby, when processing at the second processing unit Propagation of vibration from the first processing part is suppressed, and propagation of vibration through the bed body from the second processing part to the first processing part is suppressed, and thus when machining in the first processing part As a result, the workpiece can be processed with high accuracy even if the first and second processing portions are simultaneously processed.

  According to the machine tool of the second aspect of the present invention, the first main spindle is disposed on the inner side of one side of the bed body, and the second main spindle is disposed on the inner side of the other side. In the machine tool having such a configuration, since the vibration suppression space is disposed in the intermediate portion of the bed main body between the adjacent first main shaft portion and the second main shaft portion, the first processing portion to the second processing portion. Propagation of vibration to and vibration propagation from the second processing part to the first processing part can be effectively suppressed.

  According to the machine tool of the third aspect of the present invention, a communication space that communicates the first cooling liquid space and the second cooling liquid space is provided in a part of the intermediate portion of the bed main body. Since the vibration suppression space is provided in the other part of the intermediate part, it is convenient for the machine tool provided with the first and second cooling liquid spaces for cooling the first and second main spindle parts. Can be applied to.

  According to the machine tool of the fourth aspect of the present invention, the plurality of columns in the workpiece transfer device for carrying the workpiece into and out of the machining unit are supported by the bed body, and at least of these columns. Since vibration suppression space is provided in one thing, the vibration propagated from the workpiece transfer device to the bed main body via the support column is suppressed by the vibration suppression space, and the workpiece is conveyed when machining in the processing part. The influence of vibration from the apparatus is suppressed, and as a result, the workpiece can be processed with high accuracy in the processing section.

  According to the machine tool of the fifth aspect of the present invention, since the vibration suppression space is filled with the vibration suppression member for suppressing the propagation of vibration, the vibration suppression member can transmit the vibration. Furthermore, it can suppress effectively.

  Furthermore, according to the machine tool according to claim 6 of the present invention, the vibration suppressing member is made of any one of a metal granular member, a ceramic granular member, and granular sand, or a mixture thereof. The suppressing member can effectively suppress the propagating vibration and further increase the processing accuracy of the workpiece.

The front view which shows the NC lathe as an example of the machine tool according to this invention. Sectional drawing which looked at the machine tool of FIG. 1 from the front. Sectional drawing which looked at the machine tool of FIG. 1 from diagonally right front. The end view which cut | disconnected the intermediate part of the bed main body in the machine tool of FIG. Sectional drawing which shows a part of support | pillar of the loader apparatus in the machine tool of FIG. The figure which shows simply the apparatus for demonstrating a vibration propagation test. The figure which shows the test result when a vibration propagation test is done. The figure which shows the influence degree which acts on a process when it applies to a machine tool.

  Hereinafter, an embodiment of a machine tool according to the present invention will be described with reference to the accompanying drawings. 1 to 3, the illustrated NC lathe 2 as an example of a machine tool includes a substantially rectangular bed body 4, and a first processing portion 8 is provided on one side portion 6 of the bed body 4. A second processing portion 12 is provided on the other side portion 4 of the four.

  The first machining unit 8 includes a first spindle 14 for rotatably supporting a first spindle (not shown), and a first tool support 16 for supporting a first machining tool 25 (FIG. 3). In this embodiment, the first main shaft portion 14 is provided on the inner side of the one side portion 6 of the bed body, and the first tool support portion 16 is the outer side portion of the one side portion 6 (that is, the figure of the bed body 4). 1 and the left end in FIG.

  A first main shaft of the first main shaft portion 14 extends in the front-rear direction of the bed body 4 (a direction perpendicular to the paper surface in FIGS. 1 and 2, a direction from the lower left to the upper right in FIG. 3). A means 18 is attached, and a first workpiece (not shown) to be processed in the first processing section 8 is detachably attached to the first chuck means 18. The first main shaft is rotated counterclockwise (or clockwise) in FIG. 1, and the first chuck means 18 is rotated together with the first main shaft.

  In addition, the first tool support portion 16 includes a first turret device 20, and the first turret device 20 includes a plurality of (in this embodiment, eight) first tool attachment portions 22 at intervals in the circumferential direction. A first turret means 24 provided and a first support member 26 that rotatably supports the first turret means 24 are provided, and a plurality of first tool attachment portions 22 are used to process a first workpiece as required. A first machining tool 25 (see FIG. 3) is attached to be removable. The first support member 26 substantially passes through a first support mechanism 28 in a predetermined direction (a direction perpendicular to the axis of the first main shaft and in the left-right direction in FIGS. 1 and 2) and the predetermined direction. It is attached to the bed main body 4 so as to be movable in a vertical direction (a direction parallel to the first main axis and perpendicular to the paper surface in FIGS. 1 and 2).

  The 2nd process part 12 has the structure similar to the 1st process part 8 mentioned above, the 2nd spindle part 30 for supporting the 2nd spindle (not shown) rotatably, and the 2nd process tool ( And a second tool support portion 32 for supporting the second tool support portion 32. In this embodiment, the second main shaft portion 30 is provided on the inner side of the other side portion 10 of the bed body 4, and the second tool support portion is provided. 32 is provided in the outer side part of the other side part 10 (namely, the right end part in FIG.1 and FIG.2 of the bed main body 4).

  A second main shaft of the second main shaft portion 30 extends in the front-rear direction of the bed main body 4, and a second chuck means 34 is attached to the second main shaft, and the second processing portion 12 is processed by the second chuck means 34. A second workpiece (not shown) is detachably attached. The second main shaft is rotated clockwise (or counterclockwise) in FIG. 1, and the second chuck means 34 is rotated together with the second main shaft.

  The second tool support portion 32 includes a second turret device 36. The second turret device 36 includes a plurality of (eight in this embodiment) second tool attachment portions 38 at intervals in the circumferential direction. A second turret means 40 provided and a second support member 42 that rotatably supports the second turret means 40 are provided, and the second tool attachment portion 38 is used to process the second workpiece as required. A second machining tool (not shown) is removably attached. The second support member 42 passes through the second support mechanism 44 in a predetermined direction (left-right direction in FIGS. 1 and 2) and a direction substantially perpendicular to the predetermined direction (perpendicular to the paper surface in FIGS. 1 and 2). It is attached to the bed main body 4 so as to be movable in any direction.

  The NC lathe 2 is provided with first and second coolant spaces 52 and 54 for cooling the first and second main spindle portions 14 and 30 of the first and second machining portions 8 and 12 (see FIG. 2 and FIG. 3). The first coolant space 52 is provided in the inner portion of the one side portion 6 of the bed main body 4 corresponding to the first spindle portion 14, and the first spindle is driven by the coolant circulated through the first coolant space 52. The part 14, in other words, the first main shaft and its periphery are cooled. Further, the second coolant space 54 is provided in the inner side portion of the other side portion 10 of the bed body 4 corresponding to the second main shaft portion 30, and the coolant circulating through the second coolant space 54 is The second main shaft part 30, in other words, the second main shaft and its surroundings are cooled.

  In this embodiment, the one side portion 6 and the other side portion 10 of the bed main body 4 are integrally formed through the intermediate portion 56, and the coolant is circulated through the intermediate portion 56. Referring also to FIG. 4, communication spaces 58 and 60 are provided in a part of the intermediate portion 56 (the rear portion in this embodiment) of the bed main body 4. One communication space 58 (located on the lower side) communicates with the lower portions of the first and second coolant spaces 52 and 54, and the other communication space 60 (located on the upper side) includes the first and second communication spaces 58 and 54. 2 The upper portions of the coolant spaces 52 and 54 communicate with each other.

  The intermediate portion 56 is provided with a forward flow path 62 communicating with one communication space 58, and a supply side pipe 64 is connected to the forward flow path 62. The supply side pipe 64 is connected to a supply pump (not shown). For example, a coolant tank (not shown). The intermediate portion 56 is provided with a return flow channel 66 communicating with the other communication space 60. A return side pipe 68 is connected to the return flow channel 66, and the return side pipe 68 is a radiator (not shown). To a coolant tank (not shown).

  With this configuration, the coolant in the coolant tank (not shown) is supplied to the forward flow path 62 through the supply side pipe 64 by the action of the supply pump (not shown). The supplied coolant flows into the first communication space 58 (lower communication space) and then flows into the first and second coolant spaces 52 and 54, and passes through the first and second coolant spaces 52 and 54. After flowing upward, it flows to the return channel 66 through the other communication space 60 (upper communication space), and then returns to the coolant tank (not shown) through the return side pipe 68 and the radiator (not shown). Thus, the coolant in the coolant tank is circulated through the first and second coolant spaces 52 and 54. The first main shaft portion 14 disposed above the first cooling liquid space 52 is cooled by the cooling liquid circulated through the first cooling liquid space 52, and the cooling liquid circulated through the second cooling liquid space 54. Thus, the second main shaft portion 30 disposed above the second coolant space 54 is cooled.

  In this NC lathe 2, in order to suppress the propagation of vibration from the first machining unit 8 to the second machining unit 12, and to suppress the propagation of vibration from the second machining unit 12 to the first machining unit 8, It is structured as follows. 3 and 4, a vibration suppression space 70 is provided in another portion (in this embodiment, the front portion) of the intermediate portion 56 of the bed main body 4. The vibration suppression space 70 extends downward from the upper end of the intermediate portion 56 along the communication spaces 58 and 60 provided in a part thereof. Since it is configured in this way, the vibration suppression space 70 suppresses the propagation of vibration from the first processing unit 8 to the second processing unit 12 through the bed body 4, and from the second processing unit 12. Propagation of vibrations through the bed body 4 to the first processing unit 8 is suppressed, and as a result, even if the first and second processing units 8 and 12 are simultaneously processed, the influence of vibration can be suppressed. The first and second workpieces 8 and 12 can process the first and second workpieces with high accuracy.

  Although not illustrated, the vibration suppression space 70 is preferably filled with a vibration suppression member for effectively suppressing vibration propagation. As the vibration suppressing member, a spherical member such as a steel ball, a glass ball, or a resin ball, a liquid such as oil, or the like can be used. It is preferable to use a mixture. For example, iron, stainless steel, or the like can be used as the metal. The particle size of the metal granular member and the ceramic granular member is preferably about 150 to 500 μm, for example, and the particle size of the granular sand is preferably about 30 to 200 μm, for example. In addition, after filling the vibration suppressing member so that the vibration suppressing space 70 is sufficiently filled, the cover member 72 is attached so as to cover the opening of the vibration suppressing space 70 as shown in FIG.

  When the vibration suppression member is filled in the vibration suppression space 70 in this way, vibration propagated through the intermediate portion 56 of the bed body 4 is further effectively suppressed, and the first processing unit 8 (or the second processing unit 12). Can further suppress the influence of the vibration generated in the second processing unit 12 (or the first processing unit 8), and the first and second processing units 8 and 12 can perform processing with higher accuracy.

  In the above-described embodiment, the communication spaces 58 and 60 are provided in the rear portion of the intermediate portion 56 of the bed body 4 and the vibration suppression space 70 is provided in the front portion thereof, but on the contrary, the front of the intermediate portion 56 is provided. The communication spaces 58 and 60 may be provided in the part, and the vibration suppression space 70 may be provided in the rear part.

  Further, for example, in the above-described embodiment, the communication spaces 58 and 60 and the vibration suppression space 70 are provided in the intermediate portion 56 of the bed body 4, but when cooling with cooling water is not performed, the cooling water is passed through the intermediate portion 56. For example, when the intermediate portion 56 is not circulated, the communication spaces 58 and 60 of the intermediate portion 56 can be omitted, and the vibration suppression space 70 can be provided over most of the intermediate portion 56.

  As shown in FIGS. 1 and 2, the NC lathe 2 includes a workpiece transfer device 73 for loading and unloading the first and second workpieces (in FIG. 2, the workpiece transfer is performed). A part of the device 73 is omitted). The illustrated workpiece transfer device 73 includes a plurality of (four in this embodiment) support columns 74, 76, 78, and 80, and these support columns 74, 76, 78, and 80 are attached to the four corners of the bed body 4. ing. In this embodiment, mounting members 77 and 79 (only the front side members are shown in FIGS. 1 and 2) are attached to the square portions of the bed main body 4, and mounting bolts 81 (see FIG. 5) are attached to these mounting members 77 and 79. It is attached. In addition, you may make it attach these support | pillars 74,76,78,80 directly to the bed main body 4. FIG.

  A left connecting member 82 is attached between a pair of support pillars 74 and 78 on one side (left side in FIGS. 1 and 2) of the bed main body 4, and a pair of support pillars 76 and 80 on the other side (right side in FIGS. 1 and 2). A right connecting member 84 is attached between them, and a control box 86 is attached between the left connecting member 82 and the right connecting member 84.

  Further, a movement support member 88 is attached between the upper ends of the pair of front columns 74 and 76, and the holding unit 90 is supported on the movement support member 88 so as to be movable in the left-right direction in FIGS. . The holding unit 90 is a pair of holding means for holding a workpiece (not shown), that is, the first and second holding means 92 and 94 and the first and second holding means 92 and 94 are movable. And a moving support mechanism 95 for supporting. The first holding means 92 is for detachably holding a workpiece to be processed and carrying it into the first and second processing portions 8 and 12, and the second holding means 94 is processed. This is for holding the workpiece detachably and carrying it out from the first and second machining sections 8.12.

  The moving support mechanism 95 is supported by the moving support member 88 so as to be movable in the left-right direction, and is moved by the support main body 96 in the front-rear direction (direction perpendicular to the paper surface in FIGS. 1 and 2). A movable support portion 98 that is freely supported, and an arm portion 100 that is supported by the movable support portion 98 so as to be movable in the vertical direction are provided, and first and second holding means 92, 94 is installed.

  In the workpiece transfer device 73, as shown in FIG. 5, in order to suppress the propagation of vibrations through the columns 74, 76, 78, 80, vibration suppression spaces are provided in the columns 74, 76, 78, 80. 102 and 104 are provided (in FIG. 5, only the configuration related to the column 74 is shown). Each strut 74, 76, 78, 80 has substantially the same configuration, and the strut 74 (78) will be described below.

  The vibration suppression space 102 is provided at the lower end portion of the support column 74 (78), and the other vibration suppression space 104 is provided at an intermediate portion of the support column 74 (78). The vibration suppression spaces 102 and 104 are formed by, for example, providing a rectangular recess 106 in the support column 74 (78), attaching a closing member 110 to the opening step 108 of the recess 106, and fixing with the mounting bolts 81 and 112. With this configuration, it is possible to provide the vibration suppression spaces 102 and 104 while suppressing the strength reduction of the column 74 (78).

  In addition, the vibration suppression spaces 85 and 87 are also provided in the attachment members 77 and 79 to which the support columns 74, 76, 78, and 80 are attached (see FIG. 2), and the upper surface openings of the vibration suppression spaces 85 and 87 are closed. A cover member (not shown) is attached to the.

  Although not shown in the vibration suppression spaces 102 and 104 of the columns 74, 76, 78 and 80 and the vibration suppression spaces 85 and 87 of the mounting members 77 and 79, similarly to the vibration suppression space 70 of the bed body 4. In addition, it is preferable to fill a vibration suppressing member for suppressing vibration propagation. Examples of the vibration suppressing member that fills the vibration suppressing spaces 102, 104, 77, and 79 include urethane foam resin, oil (for example, industrial lubricating oil). ), Water, metal granular members, ceramic granular members, granular sand, and the like can be used.

  In this embodiment, the two vibration suppression spaces 102 and 104 are provided in each of the columns 74, 76, 78, and 80 of the workpiece transfer device 73. , 104 can provide a desired effect.

  In this embodiment, the vibration suppression spaces 102 and 104 are provided in all of the columns 74, 76, 78, and 80 of the workpiece conveyance device 73, but at least one of these columns 74, 76, 78, and 80 is provided. A desired effect can be obtained by providing it.

  Further, in this embodiment, the vibration suppression spaces 102 and 104 are provided in the respective columns 74, 76, 78, and 80, and the vibration suppression spaces 85 and 87 are provided in the attachment members 77 and 79. Without being limited thereto, a vibration suppression space may be provided only in any one of the columns 74, 76, 78, 80 or the attachment members 77, 79.

  In the above-described embodiment, the description has been made by applying the present invention to an NC lathe provided with the first and second machining parts 8 and 12 (that is, one equipped with two machining parts). The technology related to this can be applied to an NC lathe or the like having one machining section as well.

  As mentioned above, although one embodiment of the NC lathe as an example of the machine tool according to the present invention has been described, the present invention is not limited to this embodiment, and various modifications and corrections can be made without departing from the scope of the present invention. is there.

  For example, in the above-described embodiment, both the technology for suppressing vibration propagation through the bed body and the technology for suppressing vibration propagation through the column of the workpiece transfer device are applied. Either one of the techniques can be applied alone.

  Although the present invention has been described by applying the present invention to an NC lathe, the present invention is not limited to such an NC lathe, and two machining parts, that is, first and second machining parts are provided adjacent to the bed main body. The same can be applied to other machine tools.

  In order to confirm the effect of the vibration suppressing member, a vibration propagation test was performed using the test apparatus shown in FIG. In FIG. 6, in this vibration propagation test, a hollow sleeve member 200 (for example, a pipe member) is used, and the vibration suppressing member 202 is sufficiently filled so that no space is generated in the hollow sleeve member 200. Was closed with closing members 204 and 206 to produce a test member 208. As the test member 208, the hollow sleeve 200 is not filled with a vibration suppression member (test member A), the hollow sleeve 200 is filled with super hard urethane as the vibration suppression member 202 (test member B), the hollow sleeve member 200 filled with lubricating oil as vibration suppression member 202 (test member C), and hollow sleeve member 200 filled with granular sand (particle size: about 30 to 150 μm) as vibration suppression member 202 (test member) D) and the hollow sleeve 200 filled with a ceramic granular member (particle size: about 180 to 400 μm) as the vibration suppressing member 202 (test member E) were used. The hollow sleeve member 200 was an iron pipe member having a length L of 300 mm, an outer diameter D1 of 21.7 mm, and an inner diameter D2 of 16.1 mm.

  In the vibration propagation test, a vibration propagation test was performed using the test apparatus shown in FIG. One end of the member 208 was clamped and fixed between a pair of clamping members 210 and 212 of the fixing device. Further, in order to measure the vibration suppression characteristics of the filled vibration suppression member 208, an acceleration sensor 214 is attached to the tip of the test member 208. Then, an impact was applied with a hammer (not shown) to a portion P 150 mm from one end fixed to the pair of clamping members 210 and 212, and the acceleration change state at this time was measured by the acceleration sensor 214.

  For comparison, a similar vibration propagation test was performed using a solid iron member (same material as the hollow sleeve member) (test member F). Also in this case, an impact was applied with a hammer (not shown) to a part P 150 mm from one end fixed to the pair of clamping members 210 and 212, and the acceleration change state at this time was measured by the acceleration sensor 214.

  The result of this vibration propagation test was as shown in FIG. The result of the test member A is as shown in FIG. 7A, and the result of the test member B (or C, D, E, F) is as shown in FIG. 7B (or FIG. 7C), FIG. 7 (d), FIG. 7 (e), and FIG. 7 (f)). As is clear from this vibration propagation test, when the test results of the test members A to E using the hollow sleeve member 200 and the test member F using the solid member are compared, the test members A to E are tested. It was found that the initial amplitude was smaller than that of the member F. The magnitude of this amplitude affects the roughness of the machined surface when machining, and the fact that this amplitude is small can reduce the roughness of the machined surface. It was confirmed that it could be processed with high accuracy.

  Moreover, when the experimental results of the test members D and E and the test members A to C are compared, the test member D (filled with granular sand) and the test member E (filled with a ceramic granular member) are better. It was found that the impact attenuation was large. The short decay time means that the time affected by vibration during machining is short. For example, the vibration from the workpiece transfer device is attenuated and the main shaft portions (first and second main shaft portions). Therefore, it was found that the processed surface can be processed with high accuracy. From the above, by using a hollow sleeve member and using a ceramic granular member or granular sand as a vibration suppressing member, a large vibration suppressing effect can be obtained, thereby suppressing the influence when vibration is applied. It was found that it can be processed with high accuracy.

  Next, a machining experiment was performed using the machine tool shown in FIGS. A vibration suppression space is provided in the middle part of the bed body of this machine tool, each of the four columns and each of the four mounting members, and these vibration suppression spaces are sufficiently filled with granular sand (the same sand used in the vibration suppression test). The experiment was performed using the machine tool (machine tool A) and the machine (machine tool B) that does not fill the vibration suppression space with the vibration suppression member.

  In the machining experiment, the workpiece was mounted on the first chuck means, the first spindle was rotated, and the workpiece was cut by the cutting tool attached to the first tool attachment portion. The workpiece was a round bar with an outer diameter of 40 mm, and the material was a work material (C3604BD). At this time, various operations on the second main shaft portion side, that is, turning of the second turret means, movement of the second support member in a predetermined direction, movement of the second support member in a direction perpendicular to the predetermined direction, The two spindles were each rotated, and the workpiece transfer device was further moved.

  When the surface shape of the workpiece cut using the machine tool A is measured, the measurement result is as shown in FIG. 8A, and the workpiece cut using the machine tool B is measured. When the surface shape was measured, the measurement result was as shown in FIG. As is clear from the results of this machining experiment, the surface roughness of the workpiece machined by the machine tool A is small, which means that when granular sand is used as the vibration suppressing member, the surface roughness is increased from the second main shaft side. It has been confirmed that the propagation of vibration to the one main spindle part and the propagation of vibration from the workpiece conveying apparatus side to the first main spindle part side can be effectively suppressed.

2 NC lathe 4 Bed main body 8 1st processing part 12 2nd processing part 14 1st main spindle part 16 1st tool support part 20 1st turret device 30 2nd spindle part 32 2nd tool support part 36 2nd turret device 52 2nd 1 Coolant Space 54 Second Coolant Space 70, 85, 87, 102, 104 Vibration Suppression Space 73 Workpiece Conveying Device 74, 76, 78, 80 Post 77, 79 Mounting Member 90 Holding Unit 92 First Holding Mean 94 Second holding means 95 Moving support mechanism 200 Hollow sleeve member 202 Vibration suppressing member 208 Test member

Claims (6)

A bed main body; a first processing portion provided on one side of the bed main body; and a second processing portion provided on the other side of the bed main body, wherein the first processing portion includes a first spindle. A first spindle portion for supporting the first workpiece and a first tool support portion for supporting the first machining tool for machining the first workpiece, and the second machining portion for supporting the second spindle. A machine tool comprising: a second main spindle portion; and a second tool support portion for supporting a second machining tool for machining a second workpiece.
Between the one side part and the other side part between the one side part of the bed main body supporting the first processing part and the other side part of the bed main body supporting the second processing part. A machine tool comprising a vibration suppression space for suppressing vibration propagation of the machine tool.   The first main shaft portion is disposed on the inner side portion of the one side portion of the bed body, the second main shaft portion is disposed on the inner side portion of the other side portion, and the adjacent first main shaft portion and the second main shaft portion. The machine tool according to claim 1, wherein an intermediate part of the bed main body is provided between and a vibration suppression space is provided in the intermediate part.   The one side portion of the bed body is provided with a first cooling liquid space for circulating a cooling liquid corresponding to the first main shaft portion, and the second side portion of the bed body has the second cooling space. A second cooling liquid space for circulating the cooling liquid is provided corresponding to the main shaft portion, and the first cooling liquid space and the second cooling liquid space communicate with a part of the intermediate portion of the bed body. The machine tool according to claim 2, wherein a communication space is provided, and the vibration suppression space is provided in another portion of the intermediate portion of the bed body. A bed main body, and a processing portion provided in the bed main body, the processing portion including a main shaft portion for supporting a main shaft, and a tool support portion for supporting a processing tool for processing a workpiece. In machine tools equipped with
A workpiece transfer device for loading and unloading the workpiece to and from the processing unit is provided, and the workpiece transfer device is provided between the plurality of support columns supported by the bed body and the plurality of support columns. And a holding unit that reciprocates along the movement support member, and at least one of the plurality of columns is provided with a vibration suppression space for suppressing vibration propagation. A machine tool characterized by that.   The machine tool according to any one of claims 1 to 4, wherein the vibration suppression space is filled with a vibration suppression member for suppressing vibration propagation. The machine tool according to claim 5, wherein the vibration suppressing member is made of any one of a metal granular member, a ceramic granular member, and granular sand, or a mixture thereof.

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