WO2018193623A1

WO2018193623A1 - Shim plate and attachment structure using shim plate

Info

Publication number: WO2018193623A1
Application number: PCT/JP2017/016064
Authority: WO
Inventors: 竹島弓; 鈴山惠史
Original assignee: 株式会社Ｆｕｊｉ
Priority date: 2017-04-21
Filing date: 2017-04-21
Publication date: 2018-10-25
Also published as: JPWO2018193623A1; JP6850343B2

Abstract

Provided are a shim plate, the presence of which can be recognized, and an attachment structure using this shim plate. This shim plate, which is sandwiched between a first member and a second member that are integrally assembled with their respective assembly surfaces overlapping one another, is equipped with an identification portion that protrudes from an assembly site where the first member and the second member overlap one another. The attachment structure using this shim plate, wherein an overlapping first member and second member are integrally assembled with the shim plate sandwiched therebetween, is configured such that the identification portion provided on the shim plate protrudes from an assembly site where the first member and the second member overlap one another.

Description

Shim plate and assembly structure using shim plate

The present invention relates to a shim plate capable of grasping its existence in a mounted state and an assembly structure using the shim plate.

機械 Shim plates are often used in machine structures to adjust dimensions between members. For example, Patent Document 1 below discloses a configuration in which a bucket portion and an arm of a hydraulic excavator are pin-coupled and a shim plate is used there. Specifically, in order to increase the assembling accuracy of the members in the bearing portion, several shim plates are sandwiched between the members and fastened by bolts.

Japanese Patent Application Laid-Open No. 07-331689 JP 2007-71218 A

In the above-described conventional example, a plurality of shim plates are prepared, and dimension adjustment is performed by sandwiching as many shim plates as necessary. At this time, all of the prepared shim plates have the same thickness, for example, and the dimensions can be adjusted by stacking one or several sheets. Some structures that require higher assembly accuracy require, for example, assembly with dimensions adjusted in units of microns. In such a structure, a shim plate having a thickness of micron is used to eliminate a slight assembling error. However, since such a shim plate is extremely thin, its presence may be lost when attached. For this reason, structural parts may be reassembled during maintenance, etc., but the operator may work without noticing the shim plate, and the shim plate may be lost or damaged. there were.

Therefore, an object of the present invention is to provide a shim plate capable of grasping existence and an assembly structure using the shim plate in order to solve such a problem.

The shim plate according to one aspect of the present invention is sandwiched between a first member and a second member that are integrally assembled with each other with their assembly surfaces overlapped, and the first member and the second member. And an identification portion that protrudes from the assembly portion where the and overlap.

The assembly structure using the shim plate in another aspect of the present invention is such that the first member and the second member that are overlapped are integrally assembled with the shim plate interposed therebetween, and the assembly is provided on the shim plate. The identification portion thus formed protrudes from the overlapping assembly portion of the first member and the second member.

According to the above configuration, in the assembly structure, since the identification portion provided on the shim plate protrudes from the assembly portion where the first member and the second member overlap, even if the shim plate is extremely thin, Can easily grasp its existence.

It is the side view which showed the internal structure of the machine tool. It is the perspective view which showed the drive mechanism of the machine tool. FIG. 3 is a perspective view showing a drive mechanism portion of the same machine tool shown in FIG. 2 with an X-axis slide or the like removed from a column. It is an expansion perspective view of the assembly structure using a shim plate. It is an expansion perspective view of the disassembled state of the assembly structure using a shim plate.

Next, an embodiment of a shim plate and an assembly structure using the shim plate according to the present invention will be described below with reference to the drawings. In the present embodiment, a drive mechanism assembly structure in a machine tool will be described as an example. First, the machine tool will be briefly described. FIG. 1 is a side view showing the internal structure of a machine tool. The machine tool 1 is a turret lathe provided with various tools 401 such as a rotary tool such as an end mill or a drill or a cutting tool such as a cutting tool.

In the machine tool 1, a spindle device 3 for gripping and rotating a workpiece is assembled with its rotation axis (main axis) in the longitudinal direction of the machine body and horizontal. The direction parallel to the main axis is the Z axis, and the vertical direction perpendicular to the Z axis is the X axis. The machine tool 1 is configured as a two-axis lathe that moves the tool 401 of the turret device 4 in the Z-axis direction and the X-axis direction. In the machine tool 1, a column 5 is erected on the side of the spindle device 3, and a drive mechanism is configured to move the turret device 4 in the Z-axis direction and the X-axis direction. Here, FIG. 2 is a perspective view showing a drive mechanism of the machine tool 1 that moves the turret device 4 in the X-axis direction and the Z-axis direction.

The column 5 is integrally formed with a cylindrical assembly portion 301 to which the spindle device 3 is assembled, and the X-axis slide 11 is disposed thereon. In the column 5, two guide rails 12 are provided in a vertical direction on the front surface portion on the main shaft side, and an X-axis slide 11 is slidably attached to the guide rail 12. An X-axis servomotor 13 is fixed to the upper portion of the column 5, and the rotation is transmitted to the X-axis drive mechanism via the V-belt 14. Therefore, the screw shaft is rotated by the output of the X-axis servomotor 13, the rotational motion is converted into the linear motion of the nut, and the X-axis slide 11 is moved up and down in the X-axis direction.

Further, a Z-axis guide 15 is fixed to the X-axis slide 11, and a Z-axis slide 16 is slidably fitted into the Z-axis guide 15. Then, the turret device 4 is assembled integrally with the Z-axis slide 16 (see FIG. 1). The X-axis slide 11 is provided with a support frame 17, to which a Z-axis servomotor 18 is fixed, and the rotation is transmitted to the Z-axis drive mechanism via the V belt 19. Accordingly, the screw shaft is rotated by the output of the Z-axis servomotor 18, the rotational motion is converted into the linear motion of the nut, and the Z-axis slide 16 is moved horizontally in the Z-axis direction.

As described above, the ball screw mechanism including the screw shaft and the nut is used for the X-axis drive mechanism and the Z-axis drive mechanism of the machine tool 1. Then, next, the assembly structure of the ball screw mechanism which makes the X-axis drive mechanism is demonstrated. FIG. 3 is a perspective view showing a drive mechanism portion of the same machine tool 1 shown in FIG. 2 with the X-axis slide 11 and the like removed from the column 5. As described above, the two guide rails 12 are provided on the front surface of the column 5, and the screw shaft 21 of the ball screw mechanism is assembled in the vertical direction in the space between them. In the ball screw mechanism, a screw shaft 21 is rotatably mounted by upper and lower bearing

members

22 and 23, and a nut member 24 fixed to the X-axis slide 11 side is screwed to the screw shaft 21.

Accordingly, when the screw shaft 21 is rotated, the rotational motion of the screw shaft 21 is transmitted to the nut member 24 in a non-rotating state, and is converted into a vertical motion of the nut member 24. At this time, if the screw shaft 21 is tilted, the movement of the X-axis slide 11 on which the nut member 24 is mounted is displaced. Since the movement of the X-axis slide 11 and the Z-axis slide 16 is related to the positioning of the tool 401 for machining the workpiece, if the movement is not accurate, the machining accuracy of the machine tool 1 is lowered.

In the machine tool 1 of the present embodiment, the dimensional tolerance for workpiece machining is in units of microns. Therefore, in the machine tool 1, in order to realize the processing, highly accurate assembly between parts is performed at various places. The illustrated X-axis drive mechanism is similarly required to be assembled with high accuracy. Accordingly, when the screw shaft 21 is attached, the

bearing members

22 and 23 that rotatably support the screw shaft 21 are assembled to the column 5 with high accuracy. In the assembly structure, fixing portions 501 are formed above and below the column 5, and the housings constituting the bearing

members

22 and 23 are fixed thereto by bolting.

At the time of assembly, the posture of the screw shaft 21 mounted vertically is measured, and in the case where an inclination occurs, a shim plate is interposed between the assembly surfaces of the respective members to be bolted to adjust the inclination. It is caught. For the assembly structure of the screw shaft 21 in the machine tool 1, an extremely thin shim plate having a thickness of several μm to several tens of μm is used. Here, FIG. 4 is an enlarged perspective view showing an assembly structure using the shim plate of the present embodiment. In particular, the assembly structure of the bearing member 22 assembled on the upper side of the screw shaft 21 is shown. In addition, since it is the same structure also about the lower side bearing member 23, detailed description is abbreviate | omitted.

The housing 25 of the bearing member 22 is integrally formed with two mounting portions 251 that protrude from the left and right sides. In the substantially rectangular mounting portion 251, through-holes through which the bolts 26 are passed to be fixed to the column 5 are formed at two locations on the upper and lower sides. On the other hand, fixed portions 501 are formed on the left and right sides of the column 5 so that the bearing member 22 can be disposed therebetween. The fixing portion 501 has a screw hole for fastening the bolt 26 to the assembly surface 502 on which the mounting portion 251 of the housing 25 is overlapped.

The mounting portion 251 of the housing 25 and the fixing portion 501 of the column 5 are different in size of the overlapping assembly surfaces. In this embodiment, the area of the assembly surface 502 on the column 5 side is formed larger than that on the housing 25 side. That is, the attachment portion 251 on the near side of the drawing facing the worker is formed small. And when a dimension adjustment is required at the time of an assembly | attachment, a shim plate will be inserted | pinched between the attachment part 251 and the fixing | fixed part 501. FIG. Conventionally, a shim plate having a size matched to the mounting surface on the mounting portion 251 side having a small area is used. However, in this embodiment, the shim plate 27 formed larger than the assembly surface on the attachment portion 251 side is used.

Therefore, the shim plate 27 is attached in a state where the end portion is visible from above and below the attachment portion 251 at the assembly portion of the bearing member 22 where the attachment portion 251 of the housing 25 and the fixing portion 501 of the column 5 overlap. The same applies to the member 23). That is, the

identification portions

271 and 272 shown in FIG. 5 are provided at both upper and lower ends so that the presence of the shim plate 27 of this embodiment can be seen even when it is sandwiched between the assembly portions. Here, FIG. 5 is an enlarged perspective view showing an exploded state of the assembly structure using the shim plate of the present embodiment. For easy understanding in the drawings, the

identification portions

271 and 272 of the shim plate 27 are hatched, but the actual product is not necessarily colored.

The shim plate 27 is larger than the mounting surface of the mounting portion 251 on the housing 25 side having a small area, and is formed to have the same size as the mounting surface 502 of the fixing portion 501 on the column 5 side. Therefore, when assembled as shown in FIG. 4, the upper and lower end portions of the shim plate 27 that protrude from the assembly portion where both the assembly surfaces overlap with each other become the

identification portions

271 and 272. Since the

identification portions

271 and 272 enter the eyes of the operator when the assembly portion of the bearing member 22 is viewed from the front, the presence of the shim plate 27 can be confirmed by the operator.

In this regard, the conventional assembly structure has a configuration in which a shim plate having a size obtained by cutting out the

identification portions

271 and 272 is used, and the shim plate itself is actively hidden so as not to be seen from the outside. For this reason, there are cases where the operator who performs maintenance cannot recognize the existence of the ultrathin shim plate 27 of several tens of μm. Then, the shim plate 27 may be removed at the time of disassembling work, and it may be lost without being aware of it, or may be accidentally damaged. In such a case, in the adjustment work performed after the maintenance, the measurement must be performed again and the shim plate 27 having an appropriate thickness must be selected. In other words, the work man-hours increased.

Also, the shim plate 27 used in the present embodiment is extremely thin, and the thickness cannot be recognized visually when the shim plate 27 is replaced. Therefore, it is necessary to perform measurement work using a micrometer each time, and this also increases the number of work steps. Although it is conceivable that the thickness information is marked on the shim plate 27, there is a limit to the thickness in order to mark the thin plate in units of microns. Further, when the bolt hole is formed as in the present embodiment, the marking portion may be lost. And, of course, the plate thickness cannot be confirmed in the used state.

Therefore, the shim plate 27 of the present embodiment has a configuration in which the plate thickness information is displayed on the newly provided identification portion 272. Although various methods can be considered for the display, FIG. 5 shows an example in which a small hole 275 is formed in the identification portion 272. The plate thickness is indicated by the number of the holes 275. For example, the shim plate 27 of the present embodiment can be confirmed to have a plate thickness of 20 μm by providing two holes 275. And if there is one hole 275, it can be seen that the thickness of the shim plate is 10 μm.

Therefore, in this embodiment, the

identification portions

271 and 272 of the shim plate 27 protrude from the assembly portion of the bearing member 22 where the mounting portion 251 of the housing 25 and the fixing portion 501 of the column 5 overlap each other. Even the shim plate 27 can be easily recognized by the operator. Moreover, the thickness of the shim plate 27 can be easily grasped by providing the identification portion 272 with a shape feature relating to the thickness information. Further, since the shim plate 27 is entirely overlapped with the assembly surface 502 on the column 5 side, only the

identification portions

271 and 272 of the shim plate 27 do not pop out and are damaged by bending or the like. Can be avoided.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to these, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the shape feature related to the thickness information given to the shim plate 27 is the hole, but other shapes such as a small notch in the identification portion may be used.
Moreover, in the said embodiment, although the attachment part 251 is formed smaller than the fixing | fixed part 501, the dimension of the mutually attached assembly surface may be the same, In that case, the shim plate 27 of It may be used in a state where only the

identification portions

271 and 272 protrude.

DESCRIPTION OF SYMBOLS 1 ... Machine tool 5 ... Column 21 ... Screw shaft 22 ... Bearing member 25 ... Housing 27 ... Shim plate 251 ... Mounting part 271,272 ... Identification part 501 ... Fixing part 502 ... Assembly surface

Claims

A shim plate that is sandwiched between a first member and a second member that are integrally assembled by overlapping each other's assembly surfaces;
A shim plate comprising an identification portion protruding from an assembly portion where the first member and the second member overlap.
The shim plate according to claim 1, wherein the shim plate is formed larger than an area of the assembly portion.
The shim plate according to claim 1 or 2, wherein plate thickness information of a geometric feature is attached to the identification portion.
The shim plate according to claim 3, wherein the plate thickness information is the number of holes formed in the identification portion.
The overlapped first member and second member are integrally assembled with the shim plate sandwiched therebetween, and an identification portion provided on the shim plate overlaps the first member and the second member. Assembly structure using shim plates that protrude from the assembled part.