JP2009279681A - Multi machining unit in machining machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi machining unit in a machining machine capable of improving supporting rigidity in a moving direction of each machining head to a linear guide. <P>SOLUTION: A pair of left and right second and third machining heads 21, 24 are reciprocally movably mounted in an X-axis direction on a lower frame 14a constituting a Z-axis movable body 14 through a lower X-axis guide rail 18. A pair of left and right first and fourth machining heads 20, 25 are mounted on a lower surface of an upper frame 14b through an upper X-axis guide rail 22. First-fourth machining heads 20, 21, 24, 25 are configured of base parts 20a, 21a, 24a, 25a and tool mounting parts 20b, 21b, 24b, 25b, respectively. The outer dimensions in the X-axis direction of the base parts 20a, 21a, 24a, 25a are set to be longer than outer dimensions in the X-axis direction of the machining heads of the tool mounting parts 20b, 21b, 24b, 25b. The extension direction of each base part is set to allow an arrangement pitch in the X-axis direction between respective tool mounting parts to be minimized. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multi-processing unit in a processing machine, and more particularly to a multi-processing unit that can change the arrangement pitch of a plurality of tool mounting portions.

  Conventionally, as a positioning mechanism for a multi-processing head, one disclosed in Patent Document 1 has been proposed. This positioning mechanism mounts a plurality of vertical processing heads so that they can be reciprocated by a single-side support along a pair of parallel guide rails laid on the front surface of the moving frame, and at a predetermined pitch each processing head. Positioning is performed simultaneously, and the arrangement pitch between the machining heads can be corrected. That is, the plurality of processing heads are connected by a spline shaft and a spline nut, and the adjacent processing heads are sequentially connected by a screw shaft and a nut. The rotation of the spline shaft whose rotational position is controlled is transmitted to the screw shaft by a rotation transmission mechanism provided between the spline nut and the screw shaft to position the machining head. Further, the pitch correction between the machining heads is performed by an actuator for correcting the pitch between the machining heads connected to the nut of each screw shaft.

Patent Document 2 also discloses a multi-drill structure capable of changing the drilling pitch by a plurality of drill heads as in Patent Document 1.
However, the positioning mechanism of the multi-processing head disclosed in Patent Document 1 and Patent Document 2 is a width in the moving direction of each processing head and the base portion that supports the processing head in order to reduce the pitch of the plurality of processing holes with respect to the workpiece. Since the dimensions were set to the minimum necessary, there were the following problems. That is, each machining head is cantilevered only by a narrow base portion of the machining head with respect to a pair of parallel guide rails in the movement direction of the machining head, so that the machining head receives an external force from the movement direction. In this case, the shaft center of the machining head is easily tilted in the moving direction around the slide position of the base portion, and the support rigidity is lowered. For this reason, there is a problem that the positioning accuracy in the moving direction of the machining head is lowered, and the machining accuracy such as the machining pitch of each machining hole with respect to the workpiece is lowered.

In order to solve the above-mentioned conventional problems, for example, as disclosed in Patent Document 3, the width dimension in the moving direction of the base portion of the processing head supported so as to be reciprocally movable with respect to the vertical guide is attached to the drill. It is possible to improve the support rigidity in the moving direction of the machining head relative to the guide by forming it longer than the width dimension in the moving direction of the part and making it a double-supported slide structure with the axis of the drill sandwiched between is there.
Japanese Patent Laid-Open No. 5-1111813 JP 2007-50491 A Japanese Utility Model Publication No. 4-92750

  Like the pair of processing heads guided by the guide disclosed in Patent Document 3, when the extending direction of the base portion of the pair of processing heads adjacent in the vertical direction is extended in the direction in which the base portions are separated from each other, both processing heads It is possible to shorten the arrangement pitch of the drills supported by both tool mounting portions by bringing the tool mounting portions of the two tools close to each other. However, in the case of a multi-machining unit in which machining heads are supported at four or more locations on the guide, the tool mounting portion of the machining head to be added is first or second depending on the base portion of the first or second machining head. Since the approach of the machining head to the tool mounting portion is hindered, there arises a problem that the arrangement pitch of the tool mounting portions cannot all be equal to the minimum pitch.

  The present invention solves the above-described problems in the prior art, and can minimize the arrangement pitch of the tool mounting portions of the machining heads mounted at four or more locations on the linear guide. An object of the present invention is to provide a multi-processing unit in a processing machine that can improve the support rigidity in the moving direction of each processing head and can improve the processing accuracy of a workpiece.

  In order to solve the above-described problems, the invention according to claim 1 is characterized in that a pair of guide rails is formed on the upper surface of the lower frame of the lower frame and the upper frame that are connected to each other at a predetermined interval in the vertical direction. An upper linear guide comprising a pair of guide rails in a position spaced apart upward from the lower linear guide with respect to the lower surface of the upper frame, and laid in parallel with the lower linear guide. A machining head with a plurality of horizontal axes is mounted on the linear guide so that it can be reciprocated independently. A machining head with a plurality of horizontal axes is mounted on the upper linear guide independently. A base portion that is mounted so as to be able to guide each processing head to the guide rail of the linear guide, and is formed integrally with the base portion. An outer dimension in the moving direction of the base portion is set longer than an outer dimension in the moving direction of the machining head of the tool mounting portion, and an arrangement in the moving direction between the tool mounting portions. The gist is that the base portions are configured not to interfere with each other when the pitch is minimized.

  According to a second aspect of the present invention, in the first aspect, the extending directions of the base portions of the pair of adjacent processing heads mounted on the lower linear guide are set to be separated from each other and are mounted on the upper linear guide. The pair of machining heads is arranged so as to sandwich the pair of lower machining heads, and the extending direction of the base portions of the two machining heads is set in a direction approaching each other.

  According to a third aspect of the present invention, in the first aspect, the extending directions of the base portions of the pair of adjacent processing heads mounted on the lower linear guide are set to be separated from each other and are mounted on the upper linear guide. The gist of the present invention is that the extending directions of the base portions of the pair of processing heads adjacent to each other are also set in directions away from each other.

  According to a fourth aspect of the present invention, in the first aspect, the tool mounting portion of one processing head mounted on the upper linear guide is between the tool mounting portions of the pair of processing heads mounted on the lower linear guide. The tool mounting portion of one processing head mounted on the lower linear guide is positioned between the tool mounting portions of the pair of processing heads positioned and mounted on the upper linear guide. And

  According to a fifth aspect of the present invention, in the first aspect, the extending directions of the base portions of the processing heads mounted on the lower linear guide are all set in the same direction, and the processing heads mounted on the upper linear guide The extension direction of the base part is all set in the direction opposite to the extension direction of the base of the machining head on the lower linear guide side, the tool mounting part of the machining head on the lower linear guide side, and the tool of the machining head on the upper linear guide side The gist is that the mounting portions are alternately adjacent to each other.

  According to the present invention, the outer dimension in the moving direction of the base part is set longer than the outer dimension in the moving direction of the machining head of the tool mounting part, and each base is arranged so that the arrangement pitch between the tool mounting parts is minimized. The extension direction of the part was set. For this reason, it is possible to minimize the arrangement pitch of the tool mounting portions of the machining heads mounted at four or more locations on the linear guide, and to improve the support rigidity in the moving direction of the machining heads with respect to the linear guide. It is possible to improve the machining accuracy of the workpiece.

An embodiment of a multi-processing unit in a processing machine embodying the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, two Z-axis guide rails 12 are laid in parallel with each other in the Z-axis (front-rear) direction on the upper surface of the bed 11. The Z-axis moving body 14 is mounted so as to be able to reciprocate in the Z-axis direction. As shown in FIG. 2, a servo motor 15 is fixed to the rear upper surface of the bed 11, and a ball screw 16 is directed to the rotation axis of the servo motor 15 in the Z-axis direction via a joint (not shown). Connected, the ball screw 16 is screwed into a ball screw nut 17 attached to the lower portion of the Z-axis moving body 14.

  As shown in FIG. 2, the Z-axis moving body 14 is formed in a U-shape in a side view by a lower frame 14a, an upper frame 14b, and a connecting portion 14c that connects the frames 14a and 14b at the rear end portions. . Two lower X-axis guide rails 18 as lower linear guides are laid parallel to each other in the X-axis (left and right) direction as shown in FIG. 1 on the upper surface of the lower frame 14a. A second machining head 21 and a third machining head 24 that are horizontal in a pair of left and right axes via a slider 19 are mounted so as to be able to reciprocate in the X-axis direction. Similarly, on the lower surface of the upper frame 14b, two upper X-axis guide rails 22 as upper linear guides are laid in parallel to each other in the X-axis direction. A first machining head 20 and a fourth machining head 25, which have a pair of axial directions horizontal, are mounted so as to be capable of reciprocating in the X-axis direction.

  A spindle device 26 is mounted on each of the first machining head 20, the second machining head 21, the third machining head 24, and the fourth machining head 25 so as to be arranged in a horizontal row, and each spindle device 26 includes a motor 27. The main shaft 28 is rotated about the horizontal axis by the motor 27. A tool T is mounted on the spindle 28 by a tool holder.

  The first to fourth machining heads 20, 21, 24, 25 are reciprocally moved independently in the X-axis direction by the X-axis feed mechanism 30, respectively. Since the X-axis feed mechanism 30 is configured similarly, only the X-axis feed mechanism 30 of the second machining head 21 will be described. A bearing 31 is fixed to the upper surface of the lower frame 14a, and a ball screw 32 rotatably supported by the bearing 31 at a predetermined position is screwed into a ball screw nut 33 fixed to the second machining head 21. . The base end portion of the ball screw 32 is connected to a rotating shaft of a servo motor 35 that can be rotated in the forward and reverse directions and is fixed to the upper surface of the lower frame 14a through a joint 34. When the servo motor 35 is activated, the ball screw 32 is rotated, and the second machining head 21 is reciprocated in the X-axis direction via the ball screw nut 33.

  The second machining head 21 is formed long in the laying direction of the X-axis guide rail 18, and is formed integrally with the base portion 21a including the ball screw nut 33, the upper surface of the base portion 21a, and the main shaft. The tool mounting portion 21b on which the device 26 is mounted is configured in a lateral L shape when viewed from the front. Similarly to the second machining head 21, the third machining head 24 includes a base portion 24a and a tool mounting portion 24b. Furthermore, the first machining head 20 is also composed of a base portion 20a and a tool mounting portion 20b, and the fourth machining head 25 is also composed of a base portion 25a and a tool mounting portion 25b.

  As shown in FIG. 1, the tool mounting portions 21b and 24b of the second and third machining heads 21 and 24 are arranged in a horizontal row so as to be adjacent to each other in the X-axis direction, and the base portions 21a and 24a are mutually connected. The external dimensions in the X-axis direction of the base portions 21a and 24a are set so as to extend in the separating direction and in the X-axis direction. Similarly, the first machining head 20 is formed such that the tool mounting portion 20b is adjacent to the left side of the tool mounting portion 21b and the base portion 20a is extended rightward in the X-axis direction. ing. The fourth machining head 25 is formed such that the tool mounting portion 25b is adjacent to the right side of the tool mounting portion 24b and the base portion 25a is extended leftward in the X-axis direction.

As shown in FIG. 2, a work table 41 for supporting a work is disposed at the front of the bed 11.
The first to fourth machining heads 20, 21, 24, 25 are controlled by servo motors 35 of the X-axis feed mechanisms 30 in accordance with control signals from a control device (not shown), so that the spindle devices 26. The movement is controlled individually so that the arrangement pitches of the two are equal.

Next, the operation of the multi-processing unit in the processing machine configured as described above will be described.
As shown in FIG. 1, the motor 27 is started in a state where the tools T mounted on the spindle device 26 of the first to fourth machining heads 20, 21, 24, 25 are arranged at a predetermined equal pitch. Then, the spindle device 26 and the tool T are rotated, and the servo motor 15 shown in FIG. 2 is activated to advance the Z-axis moving body 14. As a result, the first to fourth machining heads 20, 21, 24, 25 are synchronously moved forward, and the workpiece W supported on the upper surface of the workpiece table 41 is machined by the tools T.

  When it is desired to change the machining pitch of the work hole of the workpiece W by each tool T, the servo motor 35 of each X-axis feed mechanism 30 is rotated based on a control signal from a control device (not shown) in FIG. By controlling, each processing head 20, 21, 24, 25 is moved by a predetermined distance in the X-axis direction.

According to the multi-processing unit in the processing machine of the above embodiment, the following effects can be obtained.
(1) In the above-described embodiment, the first to fourth machining heads 20, 21, 24, 25 are constituted by the base portions 20a, 21a, 24a, 25a and the tool mounting portions 20b, 21b, 24b, 25b, respectively. . Further, the outer dimensions in the X-axis movement direction of the base portions 20a, 21a, 24a, and 25a are set longer than the outer dimensions in the X-axis movement direction of the processing heads of the tool mounting portions 20b, 21b, 24b, and 25b. Furthermore, in the state where the arrangement pitch between the tool mounting portions 20b, 21b, 24b, and 25b is the minimum at an equal pitch, the extending directions of the base portions so that the base portions 20a, 21a, 24a, and 25a do not interfere with each other. It was set. For this reason, the arrangement pitch of each tool mounting part 20b, 21b, 24b, 25b can be minimized. Further, the support rigidity in the X-axis direction of each of the tool mounting portions 20b, 21b, 24b, and 25b can be improved by the base portions 20a, 21a, 24a, and 25a extended in the X-axis direction even in a cantilever type. it can. As a result, the arrangement pitch in the X-axis direction of the spindle device 26 supported by the machining heads 20, 21, 24, 25 can be accurately maintained at a predetermined pitch, and a plurality of machining holes and the like are formed on the workpiece W. The pitch accuracy can be improved.

  (2) In the above embodiment, since the Z-axis moving body 14 is integrally formed in a U-shape, the mounting accuracy of the lower X-axis guide rail 18 and the upper X-axis guide rail 22 laid on the lower frame 14a and the upper frame 14b. And the mounting accuracy of each machining head can be improved.

In addition, you may change the said embodiment as follows.
As shown in FIG. 4, instead of the first and fourth machining heads 20 and 25 on the upper X-axis guide rail 22 side, base portions 36a and 37a having the same shape as the second and third machining heads 21 and 24 are provided. And the processing heads 36 and 37 having the tool mounting portions 36b and 37b are arranged upside down. Then, the spindle devices 26 are arranged in a line in the order of the machining heads 36, 37, 21, and 24, and the tool mounting portion 37 b of the machining head 37 is moved to the left of the tool mounting portion 21 b of the machining head 21 in the X-axis direction. You may comprise so that it may adjoin.

  As shown in FIG. 5, machining is performed between the tool mounting portions 21b and 24b of the machining heads 21 and 24 so that the spindle devices 26 are arranged in a row in the order of the machining heads 36, 21, 37, and 24. The tool mounting portion 37b of the machining head 36 may be adjacent to the left side in the X-axis direction of the tool mounting portion 21b of the machining head 21 with the tool mounting portion 37b of the head 37 interposed therebetween.

  As shown in FIGS. 6 and 7, a plurality of machining heads 38 having a base portion 38a and a tool mounting portion 38b having the same shape as the third machining head 24 are arranged on the lower X-axis guide rail 18. Further, a plurality of machining heads 39 having a base part 39a and a tool mounting part 39b having the same shape as the fourth machining head 25 are arranged on the upper X-axis guide rail 22, and the tool mounting parts of the upper and lower machining heads 38, 39 are arranged. 38b and 39b may be arranged alternately close to each other. Similarly, a plurality of processing heads having the same shape as the first processing head 20 and processing heads having the same shape as the second processing head 21 may be arranged.

As shown in FIG. 8, you may combine the processing heads 40 and 42 which integrally formed the tool mounting parts 40b and 42b in the center part of the base parts 40a and 42a.
As is clear from the configurations of the above embodiments, the shape and combination of the machining heads are set so that the base portions do not interfere with each other even when the arrangement pitch between the tool mounting portions of the machining head is minimized. Has been.

Although not shown, the Z-axis moving body 14 may be embodied in a processing machine provided with a mechanism that reciprocates in the Y-axis (up and down) direction.
A linear motor other than the ball screw mechanism, for example, may be used as the Z-axis feed mechanism and the X-axis feed mechanism 30 including the servo motor 15, the ball screw 16, and the ball screw nut 17.

  In the above-described embodiment, the method for controlling the movement of each spindle device 26 at an equal pitch by controlling the servo motor 35 of each X-axis feed mechanism 30 has been described. However, each spindle device 26 is moved in the X-axis direction at an irregular pitch. You may make it control and process a workpiece | work. Further, the workpiece may be processed by finely adjusting the position of each spindle device 26 in the X-axis direction.

The front view which shows one Embodiment which actualized the processing machine provided with the multi-processing unit of this invention. The right view of a processing machine. The perspective view of a processing head. The front view which shows another embodiment of the multi-processing unit in the processing machine of this invention. The front view which shows another embodiment of the multi-processing unit of this invention. The front view which shows another embodiment of the multi-processing unit of this invention. The front view which shows another embodiment of the multi-processing unit of this invention. The front view which shows another embodiment of the multi-processing unit of this invention.

Explanation of symbols

  14a ... lower frame, 14b ... upper frame, 20, 21, 24, 25, 36, 37, 38, 39, 40, 42 ... machining head, 20a, 21a, 24a, 25a, 36a, 37a, 38a, 39a, 40a , 42a ... base part, 20b, 21b, 24b, 25b, 36b, 37b, 38b, 39b, 40b, 42b ... tool mounting part.

Claims (5)

A lower linear guide composed of a pair of guide rails is laid on the upper surface of the lower frame of the lower frame and the upper frame that are connected to each other at a predetermined interval in the vertical direction, and the lower portion of the lower frame is opposed to the lower surface of the upper frame. An upper linear guide composed of a pair of guide rails is laid in parallel with the lower linear guide at a position spaced upward from the linear guide, and a plurality of machining heads with a plurality of axial directions horizontal to the lower linear guide are independent of each other. Are mounted so that they can be reciprocated, and a plurality of horizontal machining heads are mounted to the upper linear guide so that they can be reciprocated independently, and each machining head is guided to the guide rail of the linear guide. And a tool mounting portion formed integrally with the base portion, and the tool mounting portion is added to the base mounting portion. The outer dimensions in the moving direction of the base part are set longer than the outer dimensions in the moving direction of the head, and the base parts do not interfere with each other in a state where the arrangement pitch in the moving direction between the tool mounting parts is minimized. A multi-processing unit in a processing machine characterized by being configured as described above. In Claim 1, the extending direction of the base portion of the pair of adjacent processing heads mounted on the lower linear guide is set to be separated from each other, and the pair of processing heads mounted on the upper linear guide A multi-processing unit in a processing machine, wherein the multi-processing unit is disposed so as to sandwich a pair of processing heads, and an extending direction of a base portion of both processing heads is set in a direction approaching each other. In Claim 1, the extending direction of the base part of a pair of adjacent processing heads mounted on the lower linear guide is set in a direction away from each other, and the pair of adjacent processing heads mounted on the upper linear guide The multi-processing unit in a processing machine is characterized in that the extending direction of the base portion is also set in a direction away from each other. 2. The tool mounting portion of one machining head mounted on the upper linear guide is positioned between the tool mounting portions of the pair of processing heads mounted on the lower linear guide and mounted on the upper linear guide. A multi-processing unit in a processing machine, wherein the tool mounting portion of one processing head mounted on the lower linear guide is positioned between the tool mounting portions of a pair of processing heads. In claim 1, the extending direction of the base portion of each processing head mounted on the lower linear guide is set in the same direction, and the extending direction of the base portion of each processing head mounted on the upper linear guide is all It is set in the direction opposite to the extending direction of the base of the machining head on the lower linear guide side, and the tool mounting part of the machining head on the lower linear guide side and the tool mounting part of the machining head on the upper linear guide side are alternately adjacent. A multi-processing unit in a processing machine characterized by being configured as described above.

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