JP2018176392A - Workpiece holder - Google Patents

Abstract

A workpiece holder which can easily adjust a contact pressure of a workpiece is provided. A support member 14 of a workpiece holder 10 is formed with a screw hole 14a penetrating from the upper surface to the lower surface thereof, and a spring pressure adjustment screw 40 is screwed in the vertical direction in the screw hole 14a. A resilient spring 42 is interposed between the spring pressure adjustment screw 40 and the hole bottom of the support member accommodation recess 22 and is accommodated in the screw hole 14 a. A rotary tool fitting portion 40a is provided at the upper end. [Selected figure] Figure 1

Description

  The present invention relates to a workpiece holder that suppresses chattering vibrations generated in a workpiece during cutting.

  For example, when using a milling machine, drilling machine, planer or other machine tool to cut a hole that penetrates the front and back of a workpiece, it is fixed to the surface of the machine tool while floating from the surface plate of the machine tool A work piece is clamped and fixed to a vise, and in this state, cutting is performed while pressing a rotating cutter against the work piece. At this time, micro-vibration called so-called "vibbling vibration" may occur in the workpiece (it is known that chattering vibration occurs even if the thickness of the workpiece is about 10 mm or so) . Since generation of such chattering vibration causes a problem of reduction in machining accuracy, conventionally, a workpiece holder is interposed between a workpiece (particularly, a portion where chattering vibration is likely to occur) and a platen. And the tip of the workpiece holder is brought into contact with the workpiece to suppress the vibration generated at the time of cutting (see Non-Patent Document 1).

  Here, the structure of the conventional workpiece holder 100 will be briefly described. The conventional workpiece holder 100 is provided on both sides of the holder body 102, the support member 104, the support member fixing portion 106 and the support member 104. It is roughly configured by the pair of resilient springs 108 (see FIG. 8).

  The holder body 102 is in the form of a block, and a support member accommodation recess 110 is formed on the upper surface thereof, and the support member 104 is vertically movably accommodated in the support member accommodation recess 110. There is.

  The support member 104 is inserted into the cylindrical support member main body 112, the disk-like flange 114 mounted thereon and the center hole of the flange 114, and has a height screwed on the upper surface of the support member main body 112. It is roughly constituted by the adjusting screw 116. The flange 114 is fixed to the upper surface of the support member main body 112 with a screw 118.

  The resilient spring 108 is disposed in the spring accommodating hole 120 between a spring pressure adjusting screw 122 screwed into the spring accommodating hole 120 from below and the flange 114. As a result, the pair of resilient springs 108 bias the support member 104 including the height adjustment screw 116 upward. Therefore, the adjustment of the elastic force of the elastic spring 108 is performed by turning the work holder 100 upside down, inserting a hexagonal wrench from the bottom into the spring storage hole 120 and screwing and unscrewing the spring pressure adjusting screw 122 become.

  The height adjustment screw 116 can be varied in height with respect to the flange 114 by rotating and screwing and unscrewing. The fixing of the height adjustment screw 116 is by a fixing nut 124 attached to the height adjustment screw 116.

  When using this conventional workpiece holder 100, the workpiece X is lifted from the platen A and held by a vise (not shown) provided on the platen A, and chattering vibration of the workpiece X occurs. The workpiece holder 100 is inserted between the easy-to-use portion and the platen A.

  At this time, after the support member 104 of the workpiece holder 100 is pushed downward against the resilient force of the resilient spring 108 and the workpiece holder 100 is set between the workpiece X and the platen A, When the hand holding down the support member 104 is released, the support member 104 is lifted upward by the resilient force of the resilient spring 108, and the height adjustment screw 116 of the support member 104 contacts the workpiece X. At this time, the support member 104 is required to contact the workpiece X with an appropriate pressure. Therefore, after setting the workpiece holder 100 at a predetermined position, pressure adjustment as described later is performed, and when this is completed, the support member 104 is fixed at that position by the support member fixing portion 106, and then cutting is performed. Start work.

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  The workpiece holder 100 is installed between the platen A and the workpiece X as described above, and fixedly supports the workpiece X from below by the height adjustment screw 116. It is difficult to obtain the optimum contact pressure in the operation, and several adjustment operations will be repeated. At that time, it is necessary to take out the workpiece holder 100 and turn over and operate the spring pressure adjusting screw 122 from the back side, which is a complicated operation and a long setup time.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a workpiece holder capable of easily adjusting the contact pressure on the workpiece.

The invention described in claim 1 is
A holder main body 12 having a support member housing recess 22 opened on the upper surface, and vertically movably housed in the support member housing recess 22, contacts the workpiece X with a certain contact pressure A support member 14, a resilient spring 42 housed in the support member housing recess 22 below the support member 14 and pressing the support member 14 upward to apply the contact pressure to the support member 14; A workpiece holder 10 having a support member fixing screw 36 for fixing the support member 14 to the holder body 12 in a state in which the contact pressure to the object X becomes appropriate,
The support member 14 is formed with a screw hole 14a penetrating from the upper surface to the lower surface,
A spring pressure adjustment screw 40 is attached to the screw hole 14a so as to be able to screw in and out in the vertical direction,
Resilient spring 42 is interposed between the spring pressure adjustment screw 40 and the hole bottom of the support member accommodation recess 22 in the screw hole 14a,
The upper end of the spring pressure adjustment screw 40 is provided with a rotary tool fitting portion 40a, and the work holder 10 is characterized in that it is characterized.

The invention described in claim 2 is
It further comprises a height adjustment bolt 44 consisting of a bolt member 44a that can be screwed into the screw hole 14a of the support member 14 and a nut member 44b screwed to the bolt member 44a,
The workpiece holder 10 according to claim 1, wherein a tool insertion hole 44c penetrating from the upper surface to the lower surface of the bolt member 44a is formed in the bolt member 44a.

  According to the workpiece holder 10 of the present invention, the contact pressure of the workpiece X by the workpiece holder 10, that is, the adjustment operation of the elastic force of the elastic spring 42 is performed on the surface plate A As it can be done by inserting the tool K from the screw hole 14a on the upper surface side (front side) of the object holder 10, the workpiece holder 10 is hand-picked from the surface plate A as in the prior art and this is turned over. There is no need to carry out the adjustment work above, which leads to shortening of the setup work.

It is a perspective view showing the work holder concerning this invention. It is a top view of a workpiece holder. It is a bottom view of a workpiece holder. It is the ABC sectional view taken on the line in FIG. It is a front view which shows the use condition of this invention. It is a front view of the state which used the height adjustment bolt for the work holder of this invention. It is a sectional view in the case of inserting a tool from the back side (lower side). It is sectional drawing of a prior art example.

  Hereinafter, the present invention will be described according to the drawings. 1 is a perspective view showing a workpiece holder 10 according to the present invention, FIG. 2 is a plan view, FIG. 3 is a bottom view, and FIG. 4 is a sectional view taken along line A-B-C in FIG. It is. As these figures show, the workpiece holder 10 of the present invention is roughly constituted by the holder body 12, the support member 14, the resilient spring 42, the support member fixing screw 36 and the anti-rotation screw 38.

  The holder body 12 is a substantially cylindrical block made of a rigid material such as metal (usually steel is used), and the upper surface thereof has a convexly curved shape with a slightly raised central portion. There is.

  The hole formed at the center of the holder body 12 is a through hole 16 extending from the top surface to the bottom surface. At the bottom of the holder body 12, the lower end portion of the through hole 16 is scraped off so as to increase in diameter in a circular step shape, and further scraped off so as to expand on both sides from this portion to form a deformed rhombus A bottom plate 18 of the same shape is fitted into the deformed rhombus cutting portion 16 a, and the bottom plate 18 is fixed to the holder body 12 by a screw 20.

  The bottom plate 18 is fitted into the expanded rhombic cutting portion 16a so that the lower end side of the through hole 16 is closed, and the retainer main body 12 is formed with a recess where the upper portion is opened and the lower portion is closed. Become. In addition, this recess is a "support member accommodation recess 22" in which the support member 14 mentioned later is accommodated. In the central portion of the bottom plate 18, a tool insertion hole 18a whose inside diameter is set slightly larger than the outside diameter of the tip of the tool (hexagonal wrench) K is formed.

  Notches 24 in the form of semi-long holes are formed symmetrically on the left and right sides of the holder body 12 respectively. Each notch 24 is opened on the outer peripheral surface side and the upper surface side, and a screw hole 24 a for screwing is formed at the bottom of each notch 24.

  A plurality of (two in the present embodiment) magnet attachment recesses 26 are formed on the bottom surface of the holder body 12. Each magnet mounting recess 26 has a circular shape in a plan view in the present embodiment, but the shape is not particularly limited, and may be, for example, a quadrangular shape in a plan view or another polygonal shape. Then, on the outer peripheral surface of the holder main body 12, two screw holes 28 for fixing a magnet, screw holes 30 for fixing a support member, and a locking screw hole 32 are formed.

  Each magnet fixing screw hole 28 is screwed so as to reach the magnet mounting recess 26 from the outer peripheral surface of the holder body 12, and the magnet fixing screw 34 is screwed and screwed into each magnet fixing screw hole 28. It is attached reversibly.

  The magnet M is inserted into the magnet mounting recess 26 (see FIG. 3), and when the magnet fixing screw 34 screwed to the magnet fixing screw hole 28 is screwed in this state, the magnet M becomes the magnet fixing screw 34. The distal end of the magnet urges the inner surface side of the magnet mounting recess 26 so that the magnet M is fixed in the magnet mounting recess 26.

  The support member fixing screw hole 30 is screwed so as to extend from the outer peripheral surface of the holder body 12 to the through hole 16 (support member accommodation recess 22). Here, the support member fixing screw hole 30 is directed to the center so that the outer peripheral side (the outer peripheral surface side of the holder main body 12) is at a lower position with the support member accommodation concave 22 side at the center side being at the upper position. The support member fixing screw 36 is attached to the support member fixing screw hole 30 so as to be capable of screwing and screwing back. By screwing the support member fixing screw 36 and pressing the support member 14, the support member 14 can be fixed obliquely upward.

  The locking screw hole 32 has a diameter smaller than that of the support member fixing screw hole 30 described above, and is screwed so as to extend from the outer peripheral surface of the holder main body 12 to the through hole 16 (support member accommodation recess 22). A locking screw 38 is attached to the locking screw hole 32 such that it can be screwed and screwed back.

  The support member 14 is a cylindrical member made of a rigid material such as metal (generally steel is used), and the outer diameter thereof is substantially equal to the inner diameter of the through hole 16 (support member accommodation recess 22). It is set.

  At the center of the support member 14, a screw hole 14a is formed vertically through. A spring pressure adjusting screw 40 is attached to the screw hole 14a so as to be capable of screwing and screwing back. The upper end of the spring pressure adjustment screw 40 is provided with a rotary tool fitting portion 40 a such as a driver groove or a wrench hole opened on the upper surface. A straight reduced diameter portion 14d is formed at the lower end of the screw hole 14a, and the downward movement of the spring pressure adjustment screw 40 is restricted.

  Further, a resilient spring 42 is interposed between the spring pressure adjusting screw 40 and the bottom plate 18. The resilient spring 42 is formed by spirally winding a spring metal wire, and its outer diameter is set to be smaller than the inner diameter of the screw hole 14 a so that it can be accommodated in the screw hole 14 a of the support member 14. . Further, the inner diameter of the resilient spring 42 is set to be larger than the outer diameter of the tip of the tool insertion hole 18 a and the tool (hexagonal wrench) K.

  In the outer peripheral surface of the support member 14, guide grooves 14 b which extend in the vertical direction and do not reach the upper surface and the lower surface of the support member 14 are formed. The head 38a of the lock screw 38 described above is fitted into the guide groove 14b, whereby the circumferential rotation of the support member 14 is restricted. The vertical movement of the support member 14 is permitted in the length of the guide groove 14b.

  Further, a tapered surface 14c is formed on the outer peripheral surface of the support member 14 at the portion where the tip of the support member fixing screw 36 abuts, and the support member fixing screw 36 is supported when it is screwed. The tip end surface of the member fixing screw 36 is in pressure contact obliquely upward.

  When using the workpiece holder 10 configured as described above, as described in the prior art, the workpiece X is floated from the platen A with a vise (not shown) provided on the platen A. The workpiece holder 10 according to the present invention is interposed in the gap between the workpiece X and the platen A, and the workpiece holder 10 is fixed to the platen A by the magnet M (need If so, the workpiece holder 10 may be bolted to the platen A). At this time, the support member fixing screw 36 is loosened so that the support member 14 can move up and down in the support member accommodation recess 22.

  When the workpiece holder 10 is interposed between the workpiece X and the surface plate A, and the finger is removed from the support member 14, the support member 14 which has been pushed down by the finger is moved upward by the resilient force of the resilient spring 42. It is lifted up and contacts the workpiece X from the bottom.

  Here, the support member 14 is required to support the workpiece X at an appropriate contact pressure as described in the prior art. However, it is difficult to obtain an appropriate contact pressure at one time, and spring pressure adjustment needs to be performed several times.

  In the work holder 10 of the present invention, when the work holder 10 is displaced from the installation location and the upper surface of the support member 14 of the work holder 10 appears from the work X, the tool K is inserted into the screw hole 14a from above Then, the spring pressure adjusting screw 40 is turned to screw or unscrew to adjust the spring pressure.

  Then, the workpiece holder 10 of the present invention is slid back to a predetermined position relative to the workpiece X. This operation is repeated until an appropriate contact pressure is obtained. (Of course, it is also possible to pull out and adjust the work holder 10 from the gap between the work X and the platen A, and return it to its original position.)

  In the above-described example, after the workpiece X is fixed first with the vise, the workpiece holder 10 is installed in the gap between the platen A and the workpiece X. The workpiece holder 10 may be fixed first at the position, and the workpiece X may be held by a vise so that the workpiece X is placed on the workpiece holder 10. In this case, the adjustment of the contact pressure of the support member 14 is performed by removing the workpiece X from the vise and inserting the tool K from the upper surface side into the screw hole 14a of the support member 14 thus appeared.

  In this manner, the support member fixing screw 36 is tightened to fix the support member 14 to the holder main body 12 in a place where the appropriate contact pressure of the workpiece X by the workpiece holder 10 is obtained. Since the tip end side of the support member fixing screw 36 is slightly inclined upward, the support member 14 does not fall from the locked position even if a high pressure downward during cutting is applied to the support member 14.

  Therefore, when cutting is performed, a large impact force downward to the workpiece X is generated at an extremely short interval due to an impact at the time of cutting of the cutting tool. Since the support member 14 of the workpiece holder 10 supporting the workpiece X from below against the shock wave never falls below the lock position, the workpiece X is held at the cutting position without generating high frequency chatter. And high precision cutting becomes possible.

  When the gap between the workpiece X and the platen A is too large to allow the support member 14 to abut on the workpiece X, as shown in FIG. 6, the height adjustment to the upper portion of the screw hole 14a The bolt 44 may be attached. The height adjustment bolt 44 has a bolt member 44a that can be screwed into the screw hole 14a, and a nut member 44b that is screwed into the bolt member 44a. At the center of the bolt member 44a, a tool insertion hole 44c whose inner diameter is larger than the outer diameter of the tip portion of the tool (hexagonal wrench) K is formed so as to extend in the axial direction and extend from the upper surface to the lower surface The height adjustment work of the spring pressure adjustment screw 40 can be performed by inserting the tip of the tool (hexagonal wrench) K from the upper surface side into the tool insertion hole 44c.

  From the above, according to the present invention, the adjustment operation of the elastic force of the elastic spring 42 is performed by inserting the tool K from the screw hole 14a on the upper surface side (front side) of the workpiece holder 10 placed on the platen A. As in the prior art, it is possible to take the workpiece holder 10 from the surface plate, turn it over and do not need to perform the adjustment operation, and the adjustment operation can be easily performed. Setup work can be shortened.

10: workpiece holder, 12: holder body, 14: support member, 14a: screw hole, 14b: guide groove, 14c: tapered surface, 14d: crimped portion, 16: through hole, 16a: deformed rhombus cutting portion , 18: base plate, 18a: tool insertion hole, 20: screw, 22: support member accommodation recess, 24: notch, 24a: screw hole, 26: magnet mounting recess, 28: magnet fixing screw hole, 30: Support member fixing screw hole 32: anti-rotation screw hole 34: magnet fixing screw 36: support member fixing screw 38: anti-rotation screw 38a: anti-rotation screw head 40: spring pressure adjustment screw 40a: rotary tool fitting portion 42: elastic spring 44: height adjustment bolt 44a: bolt member 44b: nut member 44c: tool insertion hole 100: conventional workpiece holder 102: holder Body 104: Support member 106 Support member fixing portion 108: Resilient spring 110: Support member accommodation recess 112: Support member main body 114: Flange 116: height adjustment screw 118: screw 120: spring storage hole 122: spring pressure Adjustment screw, 124: Fixing nut, A: Plate, K: Tool (hexagonal wrench), M: Magnet, X: Workpiece

Claims (2)

A holder body having a support member receiving recess opening on the upper surface, and a support member received in the support member receiving recess so as to be vertically movable and contacting the workpiece with a certain contact pressure; A resilient spring housed in the support member housing recess below the support member and urging the support member upward to apply the contact pressure to the support member; and a contact pressure to a workpiece A work holder comprising: a support member fixing screw for fixing the support member to the holder body in a state where
The support member is formed with a screw hole penetrating from the upper surface to the lower surface,
A spring pressure adjustment screw is attached to the screw hole so as to be able to screw up and down in the vertical direction,
The resilient spring is interposed between the spring pressure adjustment screw and the hole bottom of the support member accommodation recess, which is accommodated in the screw hole.
A workpiece holder characterized in that a rotating tool fitting portion is provided at an upper end of the spring pressure adjusting screw. The workpiece holder further includes a height adjustment bolt including a bolt member that can be screwed into the screw hole of the support member, and a nut member that is screwed to the bolt member.
The workpiece holder according to claim 1, wherein the bolt member is formed with a tool insertion hole penetrating from the upper surface to the lower surface.

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