JP5858867B2 - Deburring load adjustment device - Google Patents

Description

  The present invention relates to a deburring load adjusting device that is used by being attached to a processing machine such as a machining center.

  Conventionally, a deburring brush or disk is attached to a processing machine such as a machining center to deburr a product. As a conventional technique, there is a technique in which a deburring load is adjusted by a spring force of a compression spring attached to a tool holder, for example, in order to cope with a change in cut amount accompanying deburring (see, for example, Patent Document 1). ).

JP-A-7-164293 (page 2-3, FIG. 4)

  In the deburring load adjusting device of the conventional deburring device as described above, the deburring load is controlled using a compression spring. When the change is made, the spring force changes, and the deburring load changes. Therefore, there is a problem that the edge shape after processing is not stable.

  The present invention has been made to solve the above-described problems. Even when the depth of cut changes in deburring, a constant spring force is obtained and the deburring load is always stabilized. An object of the present invention is to obtain a load adjusting device capable of obtaining stable deburring quality.

The deburring load adjusting device according to the present invention is a deburring load adjusting device for a deburring device having a deburring tool provided so that the deburring load acts in one axial direction, and the workpiece is moved in the axial direction. A workpiece holding device that is movably held in a direction parallel to the workpiece, and a constant load provided to urge the workpiece held by the workpiece holding device in the direction of the deburring tool. The work holding apparatus includes a work supporting member that supports the work, a shaft fixed to the work supporting member, and a frame member that supports the shaft so as to be movable in a direction parallel to the axial direction. with it, the said constant force spring is fixed to the frame member, the outer end portion of the spring, characterized in that it is fixed to the connecting member fixed to the shaft Than is.

According to the present invention, the work held by the work holding device including the frame member that supports the shaft fixed to the work support member so as to be movable in a direction parallel to the axial direction on which the deburring load acts can be deburred. A constant load spring provided to urge in the direction of the tool is fixed to the frame member, and the outer end of the spring is fixed to a connection member fixed to the shaft, thereby fixing the work. The deburring load is controlled by urging the deburring tool in the direction of the deburring tool by the driving force of the load spring. Stable deburring quality is always obtained without being affected by changes in tool thickness due to mounting errors and wear after tool replacement.

It is a whole block diagram which shows roughly the processing apparatus using the deburring load adjustment apparatus by Embodiment 1 of this invention. It is sectional drawing which shows the deburring load adjustment apparatus by Embodiment 1 of this invention. FIG. 3 is a cross-sectional view of the deburring load adjusting device shown in FIG. 2 as viewed from the axial direction. FIG. 3 is a connection diagram of a constant load spring of the deburring load adjusting device shown in FIG. 2. It is a reference figure explaining another example of the positional relationship of a constant load spring and a connection member. FIG. 6 is a preferable connection diagram in the case of the positional relationship shown in FIG. 5 and corresponds to a modification of FIG. 4. It is sectional drawing which shows the other usage example of the deburring load adjustment apparatus shown by FIG. It is a figure explaining the relationship between the deburring load by the deburring load adjustment apparatus shown by FIG.

Embodiment 1 FIG.
1 is an overall configuration diagram schematically showing a processing apparatus using a deburring load adjusting device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the deburring load adjusting device according to the first embodiment of the present invention. 3 is a cross-sectional view of the deburring load adjusting device shown in FIG. 2 viewed from the axial direction, and FIG. 4 is a connection diagram of a constant load spring of the deburring load adjusting device shown in FIG. In the figure, a deburring disk 1 as a deburring tool is attached to a main shaft 21 of a machining center 2 as a processing device via a tool holder 22. Further, the deburring load adjusting device 3 according to the first embodiment is mounted on a stage 23 in the machining center 2. The workpiece 6 schematically shown is installed on a workpiece support member 41 provided on the upper part of the deburring load adjusting device 3.

  As shown in FIG. 2, the deburring load adjusting device 3 includes a work support member 41, a shaft 42 fixed to the back side of the center of the work support member 41, and a pair of linearly provided shafts 42. Workpiece holding device 4 constituted by a frame member 44 comprising an upper plate member 44A, a lower plate member 44B, and four strut members 44C, which are movably supported in the vertical direction of the figure via bushes 43, and an upper plate member It consists of a constant load spring 5 fixed by a constant load spring mounting member 45 on the back side of 44A. An outer end portion 51 a of the belt-like spring 51 wound tightly, which is an output portion of the constant load spring 5, is fixed to a side surface of a connection member 46 provided on the outer peripheral portion of the shaft 42.

  In this example, three constant load springs 5 are installed at an equal angle around the shaft 42 as shown in FIG. The workpiece support member 41 is formed to have a diameter larger than that of the shaft 42 in order to secure a space for installing the workpiece 6. The connecting member 46 is fixed to the shaft 42 by a fastening member 46a. The constant load spring 5 is restrained from movement except for the linear movement of the outer end 51a of the belt-like spring 51 so that the belt-like spring 51 is wound or pulled out by a drum (not shown) provided inside the unit. Yes.

  The outer end portion 51a of the belt-like spring 51 is connected so as to be pulled out parallel to the direction of the axis A of the shaft 42 as shown in FIG. 4, and is provided so that a force B that constantly pulls up the shaft 42 in the upward direction of the drawing works. It has been. The upper plate member 44A and the lower plate member 44B are fixed in parallel to each other at a predetermined interval by four support members 44C. The pair of linear bushes 43 are provided coaxially one by one at the center of the upper plate member 44A and the lower plate member 44B, and serve to smoothly guide the shaft 42 in a straight line.

  Next, the operation of the first embodiment configured as described above will be further described with reference to FIGS. 5 is a reference diagram for explaining another example of the positional relationship between the constant load spring and the connecting member, and FIG. 6 is a preferable connection diagram in the case of the positional relationship shown in FIG. Equivalent to. FIG. 7 is a cross-sectional view showing another example of use of the deburring load adjusting device shown in FIG. 2, and FIG. 8 explains the relationship between the deburring load and the cutting depth by the deburring load adjusting device shown in FIG. FIG. As a basic operation, the deburring disc 1 is rotated by rotating the spindle 21 of the machining center 2 according to a sequence programmed in advance based on a general method, and the spindle 21 of the machining center 2 and the stage of the machining center 2 are rotated. Deburring is performed by moving 23 along the shape of the part of the workpiece 6 where the burrs are generated.

  In the above configuration, the shaft 42 moves only in the direction of the axis A and the operation in the other direction is restricted by the two linear bushes 43 coaxially attached to the upper plate member 44A and the lower plate member 44B. ing. In addition, since the constant load springs 5 that drive the shaft 42 are mounted at equal intervals on the same circumference around the axis A of the shaft 42, the balance between the force and the moment around the axis A is not in the direction of the axis A. Is canceled and driven only in the direction of axis A. In the first embodiment, the case where there are three constant load springs 5 is shown. However, if two or more constant load springs are mounted on the same circumference at equal intervals, similarly, only the axial direction is driven. Will come to be.

  As described above, since the direction in which the force is not restrained and the direction in which the force is driven are the same direction, the friction between the shaft 42 and the linear bush 43 can be minimized, and a stable output can be obtained. Will be able to. Moreover, as shown in FIG. 4, by attaching the constant load spring 5 in the direction of the axis A of the shaft 42, the output becomes constant regardless of the amount of cutting at the time of deburring. As shown in FIG. 5, when the constant load spring 5 is obliquely attached to the axis A, the force acting in the direction of the axis A is an angle formed between the axis A direction of the shaft 42 and the pulling direction of the constant load spring 5. If θ is θ, it is cos θ times. Since this angle θ varies depending on the cutting depth, the deburring load varies.

  When the positional relationship is such that the spring can be pulled out only in an oblique direction as shown in FIG. 5, a pulley 47 may be provided as shown in FIG. 6 so that the connecting member 46 can be driven in the same direction as the axis A. In addition, when the spring force of the constant load spring 5 is too large and the sag of the edge portion of the workpiece 6 becomes large, or when the mass of the workpiece 6 is changed to a lighter one by changing the model, etc. 7, for example, by installing one or more weights 48 for adjusting the spring force on the fastening member 46a, the deburring load can be adjusted without enlarging the apparatus.

  At the time of deburring, the main shaft 21 of the machining center 2 moves, and when contacting the workpiece 6, the shaft 42 moves downward in the direction of the axis A. The central axis of the shaft 42 is provided in the vertical direction and is connected to the constant load spring 5 by a connecting member 46. Since friction with the linear bush 43 is negligibly small, the deburring load is determined from the spring force by the workpiece. 6 corresponds to the work support member 41, the fastening member 46a, the connection member 46, and the shaft 42 with reduced weight. Since the spring force of the constant load spring 5 is constant even when the stroke changes, the deburring load remains constant even when the spring stroke changes, that is, the depth of cut changes, and can be processed with a constant deburring load. .

  The relationship between the depth of cut and the deburring load when deburring as described above changes as shown by curve I in FIG. That is, after the tip of the deburring disk 1 abuts against the workpiece 6, when the cutting depth further increases, the tool is deformed, and the deformation of the spring starts from the cutting depth balanced with the spring force. When the cutting depth further increases after exceeding the spring deformation region, the deburring load increases with the cutting depth in the conventional technique using the compression coil spring shown by curve II. When used, the deburring load is kept constant as in curve I. For this reason, the deburring surface is always stable.

  As described above, according to the first embodiment, the deburring load is controlled using the constant load spring 5 installed so that the force acts only in one direction as a driving force. Even if the depth of cut changes, the deburring load remains constant.For example, stable deburring quality can be obtained without being affected by changes in tool thickness due to mounting errors or wear after deburring. Is obtained. As a result, the yield in the machining process can also be improved.

  In the first embodiment, the deburring disk 1 is attached to the spindle 21 of the machining center 2 and the deburring load adjusting device 3 is installed on the stage 23 of the machining center 2 to perform deburring. The present invention is not limited to use on the machining center 2. For example, when the deburring load adjusting device 3 is installed on a work desk and the operator performs deburring with a hand tool, only the axial direction of the shaft 42 is used. Can be processed with a constant deburring load, and the same effect can be obtained. Further, for example, the deburring disk 1 may be attached to another processing machine such as a milling machine, and the deburring process may be performed using the deburring load adjusting device 3.

  In the first embodiment, the work holding device 4 has been described with respect to the case where the work support member 41 is supported by one shaft 42. However, for example, when the work 6 is large in size, two or more shafts 42 are provided. It can also be configured. When a plurality of shafts 42 are used, means for restricting the work support member 41 from rotating about the axis A is not necessary. In addition, various modifications and changes are possible within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 Deburring disk, 2 Machining center, 21 Spindle, 22 Tool holder, 23 Stage, 3 Deburring load adjusting device, 4 Work holding device, 41 Work support member, 42 Shaft, 43 Linear bushing, 44 Frame member, 44A Upper plate member 44B Lower plate member, 44C Strut member, 45 Constant load spring mounting member, 46 Connection member, 46a Fastening member, 47 Pulley, 48 Weight, 5 Constant load spring, 51 Strip spring, 51a Outer end, 6 Workpiece.

Claims (3)

A deburring load adjusting device for a deburring device having a deburring tool provided so that a deburring load acts in one axial direction, the workpiece holding the workpiece movably in a direction parallel to the axial direction. a holding device, comprises a constant force spring which is provided to a work held engaged with the workpiece holding device on the workpiece holding device biases the deburring tool, the workpiece holding device, the A workpiece supporting member for supporting a workpiece; a shaft fixed to the workpiece supporting member; and a frame member for supporting the shaft so as to be movable in a direction parallel to the axial direction. A deburring load adjusting device , wherein the spring is fixed to a member, and an outer end portion of the spring is fixed to a connecting member fixed to the shaft . 2. The deburring load adjusting device according to claim 1 , wherein a plurality of the constant load springs are provided symmetrically around the shaft. The deburring device comprises a tool holder of a spindle of a machining center and the deburring tool comprising a deburring disk mounted thereon, and the work holding device is fixed to the upper surface of a stage of the machining center. The deburring load adjusting device according to claim 1 or 2 .

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