Deburring apparatus

Abstract

To provide a deburring apparatus that can be advantageously applied to deburring of a male screw portion of a small component.SOLUTION: A deburring apparatus includes an attachment main body 42 attached to a processing apparatus side, a pressing rod movably mounted on the attachment main body 42, a support member 46 attached to the pressing rod, and a deburring unit 48 supported by the support member 46 via a shaft member 72 so as to be movable in an axial direction thereof and swingable about the shaft member 72. The deburring unit 48 has a split die 88 for removing burrs of a male screw portion of a workpiece. A coil spring (first elastic means) is disposed between the attachment main body 42 and the pressing rod, coil springs 108, 110 (second elastic means) are disposed between the support member 46 and the deburring unit 48, and floating holding means is disposed between the support member 46 and the deburring unit 48.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a deburring device that removes burrs that are generated when a through hole is formed in a male threaded portion of a workpiece. [Background technology]

[0002] For example, when manufacturing a main shaft for an automobile transmission, a male thread is formed on the main shaft (workpiece) and then a spline and keyway are formed on this male thread. When the spline and keyway are formed in this manner, burrs are generated on the male thread. This makes it impossible to assemble the main shaft as required in subsequent processes, and there is a risk of damage if an attempt is made to forcibly assemble it.

[0003] Therefore, a deburring device has been proposed for removing burrs generated on the male thread portion of a workpiece (see, for example, Patent Document 1). This deburring device includes a driving center that supports one side of the workpiece, a dead center that supports the other side, and a deburring mechanism that deburrs the male thread portion of the workpiece, and the driving center rotates the workpiece in a predetermined direction.

[0004] The deburring mechanism includes a split die for removing burrs from the male thread portion, a holding block to which the split die is attached, and a die holding member to which the holding block is attached, the die holding member being attached to a support member so as to be swingable about a support shaft. A first elastic member (e.g., a pressure spring) is interposed between the die holding member and the support member, and this first elastic member elastically biases the die holding member toward the workpiece about the support shaft.

[0005] In addition, a pair of guide shafts extending in the axial direction (first direction) of the workpiece are attached to the die holding member, and a holding block is slidably supported by the pair of guide shafts. A second elastic member (e.g., a return spring) is interposed between the holding block and the die holding member, and this second elastic member returns the holding block (i.e., the split die) to its original position. Furthermore, a guide rail is provided extending in a direction (second direction) perpendicular to the axial direction (first direction) of the workpiece, and a support member is slidably supported by this guide rail. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 2674026 Summary of the Invention [Problem to be solved by the invention]

[0007] In this type of deburring device, the support member is moved along the guide rail toward the male thread portion of the workpiece, the split die is brought into contact with the male thread portion by the action of the second elastic member, and in this contact state, the rotational force from the driving center is transmitted to the workpiece to rotate it in a predetermined direction. In this way, the split die acts on the male thread portion of the workpiece and cuts off burrs that were generated when the spline and keyway were formed as it moves axially, thereby removing burrs remaining on the male thread portion of the workpiece.

[0008] However, such deburring devices are designed to remove burrs from the male threads of large workpieces such as the main shaft of an automobile transmission, and the device itself is large, so such large deburring devices cannot be directly applied to deburring the male threads of small parts (for example, removing burrs that occur when a through hole is formed in the male thread).Therefore, there has been a demand for a deburring device that is convenient for deburring the male threads of small parts.

[0009] SUMMARY OF THE INVENTION An object of the present invention is to provide a deburring device that can be advantageously applied to deburring the external threads of small parts. [Means for solving the problem]

[0010] The deburring device according to claim 1 of the present invention comprises a mounting body attached to a processing device side, a pressing rod movably attached to the mounting body, a support member attached to the pressing rod, and a deburring unit supported on the support member via a shaft member so as to be movably axially movable and swingable about the shaft member, wherein the deburring unit has a split die that acts on a male thread portion of a workpiece to remove burrs, The present invention is characterized in that a first elastic means is disposed between the mounting body and the pressing rod, a second elastic means is disposed between the support member and the deburring unit, and a floating holding means is disposed between the support member and the deburring unit for holding the deburring unit in a floating state.

[0011] In such a deburring device, the support member has a support main body portion, a one-side support wall portion at one end of the support main body portion, and an other-side support wall portion at the other end thereof, and an axial member is attached between the one-side support wall portion and the other-side support wall portion, and the deburring unit is supported on this axial member so that it can be moved freely.It is also preferable that a first coil spring is interposed between the one-side support wall portion of the support member and the deburring unit, and a second coil spring is interposed between the other-side support wall portion and the deburring unit.By configuring in this manner, the deburring unit can be slid along the axial member, and the slid deburring unit can be returned to its original position by the action of the first and second coil springs.

[0012] It is also preferable to provide a first movement preventing means on one support wall of the support member (or one side of the support body), and by configuring in this way, it is possible to prevent movement of the deburring unit beyond the first movement preventing means (in other words, the movement restriction position).It is also preferable to provide a second movement preventing means on the other support wall of the support member (or the other side of the support body), and by configuring in this way, it is possible to prevent movement of the deburring unit beyond the second movement preventing means (in other words, the second movement restriction position).

[0013] It is also preferable that the floating holding means be composed of an abutment member accommodated in the accommodation recess of the unit body via a third elastic means and an adjustment screw threaded into the support member through the through hole of the unit body.By configuring it in this manner, the deburring unit can be held in a floating state from the support member, and the distance between the support member and the deburring unit (i.e., the unit body) can be adjusted by rotating the adjustment screw.

[0014] Furthermore, it is preferable to provide an arc-shaped mounting groove in the unit body and a positioning pin on the base side of the split die, with the base side of the split die accommodated in the mounting groove and the positioning pin inserted into the positioning recess.By configuring in this way, positioning when replacing the split die can be easily performed.

[0015] Such a deburring device can be attached to an NC lathe as a processing device and used, in which case the mounting body of the deburring device can be attached to any one of multiple tool mounting portions on the turret device. [Effects of the Invention]

[0016] According to the first aspect of the present invention, the deburring device includes a pressure rod movably mounted on a mounting body attached to a processing device, a support member attached to the pressure rod, and a deburring unit mounted on the support member. A first elastic means is disposed between the mounting body and the pressure rod, allowing the split dies of the deburring unit to elastically act on the male thread portion of the workpiece to deburr. The deburring unit is mounted on the shaft member of the support member so as to be axially movable and swingable about the shaft member, allowing it to remove burrs remaining on the male thread portion while moving along the shaft member. A second elastic means is disposed between the support member and the deburring unit, allowing the second elastic means to return the deburring unit to its original position after deburring. Furthermore, the deburring unit is held in a floating state relative to the support member, allowing the deburring unit to move axially while acting on the helical shape of the male thread portion of the workpiece to remove burrs. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a front view showing a simplified NC lathe as an example of a processing device to which a deburring device according to the present invention is applied; [Figure 2] 2 is a perspective view showing a state in which the deburring device of the embodiment is attached to the NC lathe of FIG. 1 and is performing processing. [Figure 3] FIG. 1 is a perspective view showing an embodiment of a deburring device. [Figure 4] 4 is a side view showing the deburring unit of the deburring device of FIG. 3. [Figure 5] 5 is a cross-sectional view taken along line VV in FIG. 4. [Figure 6] FIG. 5 is a plan view showing the deburring unit of FIG. 4. [Figure 7] 4 is a cross-sectional view showing the attachment body and the pressing rod in the deburring device of FIG. 3, and the configuration related thereto. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a deburring device according to the present invention will be described below with reference to the accompanying drawings. First, an NC lathe will be outlined as an example of a processing device to which this deburring device is applied with reference to FIG.

[0019] In Figure 1, this NC lathe has a bed body 2 that is placed on the floor of a factory or the like, with a main spindle unit 4 arranged on one side of this bed body 2 (the left side in Figure 1), a tailstock 6 arranged opposite the main spindle unit 4 on the other side of this bed body 2 (the right side in Figure 1), and a turret device 8 arranged on the back side of this tailstock 6 (the far side of the paper in Figure 1).

[0020] 2, a spindle (not shown) is rotatably supported on this spindle section 4, a spindle chuck 10 is attached to the spindle so as to rotate integrally with the spindle, and a plurality of chuck jaws 12 (three in this example) are attached to the spindle chuck 10 at intervals in the circumferential direction so as to be able to open and close freely. A workpiece 14 to be machined is detachably attached to the plurality of chuck jaws 12 of the spindle chuck 10, and the spindle (not shown), spindle chuck 10, and workpiece 14 are rotated integrally in a predetermined direction by a spindle motor (not shown).

[0021] Tailstock 6 is attached to bed body 2 so as to be movable in a direction approaching and moving away from spindle section 4 (left and right directions in FIG. 1, the so-called Z-axis direction). Tailstock 6 has a tail main body 16, and a tail center 18 is rotatably supported by this tail main body 16. As shown in FIG. 2, tailstock 6 rotatably supports workpiece 14 in cooperation with spindle chuck 10 of spindle section 4, with one end of workpiece 14 (the left end in FIG. 2) attached to spindle chuck 10 of spindle section 4 so as to rotate integrally therewith, and the other end (the right end in FIG. 2) supported by tail center 18 of tailstock 6 so as to rotate integrally therewith.

[0022] In this embodiment, the turret device 8 includes a turret main body 20, which is attached to the bed main body 2 so as to be movable in the lateral direction of the bed main body 2 (left and right direction in FIG. 1, the so-called Z-axis direction) and in the front and rear direction of the bed main body 2 (direction perpendicular to the paper surface in FIG. 1, the so-called X-axis direction). A rotating shaft 22 (see FIG. 2) is rotatably supported on the turret main body 20, and a turret 24 is attached to the tip of the rotating shaft 22.

[0023] The turret 24 has a regular polygonal shape and, for example, is provided with a plurality of tool mounting portions 26 spaced apart around its circumference. In FIG. 2, the turret 24 is provided with a plurality of radially extending grooves spaced apart around its circumference, which function as concave tool mounting portions 26a. Furthermore, fan-shaped portions are provided between the grooves, and the surfaces of the fan-shaped portions function as flat tool mounting portions 26b. In this embodiment, as shown in FIG. 2, the deburring device 32 is attached to any one of the flat tool mounting portions 26b of the turret 24 as described below. Alternatively, a mounting adapter (not shown) may be attached to the groove-shaped tool mounting portion 26a, and the deburring device 32 may be attached to the mounting adapter.

[0024] Next, the workpiece 14 to be deburred will be described with reference to Figure 2. As an example, the workpiece 14 is a round bar, with its tip end formed with a smaller diameter than its base end, and a male threaded portion 34 formed at the tip end, with a through-hole 36 formed in this male threaded portion 34. A workpiece 14 having such a shape is produced, for example, by forming it into the desired overall shape by cutting, then forming the male threaded portion 34 at the tip end by external threading, and then forming the through-hole 36 in this male threaded portion 34 by drilling.

[0025] When manufactured in this manner, burrs remain around the through-hole 36, and a deburring device 32 is used to remove these burrs. The deburring device 32 will be described with reference to Figures 3 to 7 as well as Figure 2. The illustrated deburring device 32 includes a mounting body 42 attached to the NC lathe side, a pressing rod 44 (see Figure 7) attached to the mounting body 42 so as to be able to move, a support member 46 attached to the tip of the pressing rod 44, and a deburring unit 48 attached to the support member 46.

[0026] 7, the mounting body 42 is composed of a mounting body portion 52 having a receiving through-hole 50 formed therein, and a sleeve-shaped member 54 fitted into the receiving through-hole 50 of the mounting body portion 52, with the pressing rod 44 housed within the sleeve-shaped member 54 so as to be movable axially. In this configuration, the inner diameter of the sleeve-shaped member 54 is somewhat smaller at its tip end than at its base end, and a step 56 is provided in the middle portion. Meanwhile, a flange portion 58 is provided at the base end of the pressing rod 44, and this flange portion 58 is configured to abut against the step 56 of the sleeve-shaped member 54. The tip side of the pressing rod 44 protrudes outward from one end of the mounting body 42 (sleeve-shaped member 54), and a protruding mounting portion 60 is provided at this end.

[0027] A cap member 62 is attached to the base side of the mounting main body 52 so as to close the accommodating through-hole 50, and a coil spring 64 serving as first elastic means is interposed between the cap member 62 (in other words, the mounting main body 42) and the pressing rod 44 (its flange portion 58). The coil spring 64 (first elastic member) elastically biases the pressing rod 44 downward in FIG. 7, and the pressing rod 44 is elastically held in a position where its flange portion 58 abuts against the step portion 56 of the sleeve-shaped member 54.

[0028] The support member 46 is generally U-shaped overall and has a support main body 66 fixed to the protruding mounting portion 60 of the pressure rod 44, a one-side support wall portion 68 (the support wall portion on the left in Figures 3 and 6) provided at one end of the support main body 66, and an other-side support wall portion 70 (the support wall portion on the right in Figures 3 and 6) provided at the other end, with the one-side support wall portion 68 and the other-side support wall portion 70 arranged opposite each other.

[0029] A shaft member 72 is attached between the one-side support wall portion 68 and the other-side support wall portion 70 of the support member 46, and the deburring unit 48 is attached to the shaft member 72 as described below. In this configuration, as shown in Fig. 6, a threaded hole (not shown) is provided in the one-side support wall portion 68, and a fixing screw 74 threaded into this threaded hole is applied to the shaft member 72, thereby fixing one end of the shaft member 72 to the one-side support wall portion 68. A threaded hole (not shown) is also provided in the other-side support wall portion 70, and a fixing screw 76 threaded into this threaded hole is applied to the shaft member 72, thereby fixing the other end of the shaft member 72 to the other-side support wall portion 70. Furthermore, male threaded portions 78, 80 are provided on both ends of the shaft member 72, and by screwing nuts 82, 84 (omitted in Figure 3) onto these male threaded portions 78, 80, the shaft member 72 is firmly fixed to the support member 46 (one-side support wall portion 68 and the other-side support wall portion 70).

[0030] The deburring unit 48 has a block-shaped unit body 86 and a split die 88 attached to the unit body 86, with the base side of the split die 88 housed in an arc-shaped mounting groove 90 of the unit body 86 and its cutting edge 91 protruding outward from the unit body 86 (see Figure 5). In this example, a positioning pin 87 is embedded in the center of the split die 88, and a positioning recess 89 corresponding to the positioning pin 87 on the split die 88 side is provided in the longitudinal center of the bottom of the arc-shaped mounting groove portion 90 of the unit main body 86.By inserting the positioning pin 87 into the positioning recess 89, the split die 88 is positioned at a predetermined position relative to the unit main body 86, and movement of the split die 88 in the longitudinal direction of the mounting groove portion 90 (the direction in which the mounting groove portion 90 extends) is prevented.

[0031] The tip of the arc-shaped receiving portion 90 of the unit body 86 is provided with inclined surfaces 92, 94 that extend obliquely on both sides, and fixing plate pieces 100, 102 are attached to these inclined surfaces 92, 94 with fixing screws 96, 98. The tip sides of the fixing plate pieces 100, 102 protrude from the unit body 86 toward the split die 88, and these protruding portions act on the inclined portions 104, 106 of the split die 88 to press them against the arc-shaped receiving portion 90 of the unit body 86. This pressing reliably prevents the split die 88 from coming off the mounting groove portion 90 of the unit body 86.

[0032] The deburring unit 48 (specifically, the unit body 86) is supported on the shaft member 72 on the support member 46 side so as to be movable in its axial direction and swingable about the shaft member 72, and a pair of coil springs, i.e., a first coil spring 108 and a second coil spring 110, serving as second elastic means are interposed between the deburring unit 48 and the support member 46. The first coil spring 108 is disposed between the one-side support wall portion 68 of the support member 46 and the unit body 86 of the deburring unit 48, with one side of the shaft member 72 fitted thereon, and the second coil spring 110 is disposed between the other-side support member 70 of the support member 46 and the unit body 86 of the deburring unit 48, with the other side of the shaft member 72 fitted thereon. The deburring unit 48 is elastically held by the first and second coil springs 108, 110 in the position shown in FIGS. 3 and 6, i.e., the intermediate position of the shaft member 72.

[0033] Because of this configuration, as will be understood from the following explanation, the deburring unit 48 (specifically, its split die 88) can swing around the shaft member 72 so as to follow the thread shape of the male thread portion 34 of the workpiece 14, and can also slide in the axial direction of the shaft member 72 while following the thread of the male thread portion 34 during deburring processing.

[0034] In this embodiment, the axial movement of the deburring unit 48 is restricted. Specifically, a first abutment bolt 112 constituting first movement preventing means is threadedly attached to the one-side support wall portion 68 of the support member 46, and when the deburring unit 48 moves significantly toward the one-side support wall portion 68, it abuts against the first abutment bolt 112 to prevent its movement. Also, a second abutment bolt 114 constituting second movement preventing means is threadedly attached to the other-side support wall portion 72 of the support member 46, and when the deburring unit 48 moves significantly toward the other-side support wall portion 70, it abuts against the second abutment bolt 114 to prevent its movement.

[0035] The first and second abutment positions of the first and second abutment bolts 112, 114 can be adjusted by rotating them in the tightening and loosening directions. The threaded portions of the first and second bolts 112, 114 protrude outward from the one-side support wall portion 68 and the other-side support wall portion 70 of the support member 46, and a lock nut 116 (only one of which is shown in FIG. 3) is screwed onto this protruding threaded portion. Note that first and second abutment pins or the like may be attached instead of the first and second abutment bolts 112, 114, and further, instead of attaching them to the one-side support wall portion 68 and the other-side support wall portion 70, they may be attached to one and the other sides of the support main body portion 66 of the support member 46.

[0036] In this embodiment, the deburring unit 48 is held in a floating state on the support member 46 by floating holding means 118. Referring mainly to Figure 5, a pair of accommodating recesses 120 are provided at both ends of the unit main body 86, and a ball-shaped member 124 is housed in these accommodating recesses 120 via a third coil spring 122 serving as third elastic means. Furthermore, a through hole 126 is provided in the unit main body 86 at a position outside the accommodating recess 120, and an attachment bolt 128 is threadedly engaged with the support main body portion 66 of the support member 46 through this through hole 126, and the third coil spring 122, the ball-shaped member 124 (which constitutes the abutting member), and the attachment bolt 128 constitute the floating holding means 118.

[0037] In this embodiment, a ball-shaped member 124 is used as the abutment member, but instead of this, for example, a hemispherical member, an arc-shaped member, etc. may be used, and although a third coil spring 122 is used as the third elastic means, a leaf spring, a disc spring, etc. may be used instead of a coil spring.

[0038] With this configuration, the pair of third coil springs 122 elastically bias the ball-shaped members 124 toward the support member 46, and the pair of ball-shaped members 124 abut against the surface of the support main body 66 of the support member 46, thereby holding the deburring unit 48 in a floating state relative to the support member 46 and allowing the unit main body 86 to move within a range up to the point where it abuts against the support main body 66 of the support member 46. Furthermore, by rotating the pair of mounting bolts 128 in the tightening or loosening direction, the distance between the deburring unit 48 (unit main body 86) and the support member 124 (support main body 66) can be adjusted.

[0039] Deburring using this deburring device 32 is performed, for example, as follows. Referring mainly to Figures 2, 5, and 6, during deburring, the base side of the workpiece 14 is attached to the spindle chuck 10 of the spindle unit 4 (see Figure 1) of the NC lathe, and the tip side is attached to the tail center 18 of the tailstock 6, thereby holding both ends of the workpiece 14. This holding of the workpiece 14 can be performed by moving the tailstock 6 toward the spindle unit 4.

[0040] Next, the turret device 8 is moved laterally (Z-axis direction) and forward / backward (X-axis direction) to a predetermined position, and the turret 24 is rotated to a predetermined angular position (i.e., an angular position at which the deburring device 32 attached to the turret 24 acts on the male thread portion 34 of the workpiece 14).

[0041] In this state, the spindle (not shown) of the spindle section 4 is rotated to rotate the workpiece 14, while the deburring unit 48 of the deburring device 32 is acted on the male thread portion 34. In this manner, the split die 88 of the deburring unit 48 moves axially along the male thread portion 34 of the workpiece 14, cutting away the burrs remaining around the through hole 36 of the male thread portion 34. In this manner, the split die 88 can cut away the burrs remaining on the male thread portion 34 of the workpiece 14.

[0042] This deburring device 32 is small and can be easily attached to the turret 24 of the turret device 8, and can be used as an additional optional device for a processing device such as an NC lathe.

[0043] Although one embodiment of the deburring device according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and alterations are possible without departing from the scope of the present invention.

[0044] For example, in the above-described embodiment, the present invention has been described as being applied to the deburring of a workpiece 14 having a male thread portion 34 at the axial tip, but it can also be applied to the deburring of a workpiece having a push-in thread portion at the axial base end or middle portion, and can also be applied to a workpiece having a male thread at the large diameter portion. [Explanation of symbols]

[0045] 2 Bed body 4 Main shaft 6 Tailstock 8 Turret Device 14 Work 26, 26a, 26b Tool mounting part 32 Deburring device 34 Male thread 36 Through hole 42 Mounting body 44 Pressing rod 46 Support member 48 Deburring unit 64 coil spring (first elastic means) 86 Unit body 88 Split Dice 108, 110 Coil spring (second elastic means) 112, 114 Abutment bolt (movement prevention means) 118 Floating retention means 122 coil spring (third elastic means)

Claims

1. the deburring unit comprises an attachment body attached to a processing device side, a pressing rod movably attached to the attachment body, a support member attached to the pressing rod, and a deburring unit supported on the support member via a shaft member so as to be movable in its axial direction and swingable about the shaft member, the deburring unit having a split die that acts on a male thread portion of a workpiece to remove burrs, A deburring device characterized in that a first elastic means is arranged between the mounting body and the pressing rod, a second elastic means is arranged between the support member and the deburring unit, and a floating holding means is arranged between the support member and the deburring unit for holding the deburring unit in a floating state.

2. the support member has a support main body portion attached to the pressing rod, a one-side support wall portion provided on one end side of the support main body portion, and an other-side support wall portion provided on the other end side of the support main body portion, the shaft member is attached between the one-side support wall portion and the other-side support wall portion, and the deburring unit is supported on an intermediate portion of the shaft member, The deburring device according to claim 1, characterized in that the second elastic means is composed of a first coil spring that fits over one side of the shaft member and is interposed between the one-side support wall portion of the support member and the deburring unit, and a second coil spring that fits over the other side of the shaft member and is interposed between the other-side support wall portion of the support member and the deburring unit.

3. A deburring device as described in claim 2, characterized in that a first movement preventing means for preventing movement of the deburring unit beyond a first movement limiting position is provided on one side support wall portion of the support member or one side portion of the support main body portion, and a second movement preventing means for preventing movement of the deburring unit beyond a second movement limiting position is provided on the other side support wall portion of the support member or the other side portion of the support main body portion.

4. The deburring device described in claim 1, characterized in that the deburring unit comprises a unit body to which the split die is attached, and the floating holding means has an abutment member accommodated in an accommodating recess of the unit body via a third elastic means, and an adjustment screw threaded into the support member through a through hole of the unit body, and the distance between the support member and the unit body is adjusted by rotating the adjustment screw.

5. The deburring device described in claim 4, characterized in that the unit main body is provided with an arc-shaped mounting groove portion having a positioning recess, and a positioning pin is attached to the base side of the split die corresponding to the positioning recess on the unit main body side, and the split die is positioned and attached to the unit main body by accommodating the base side of the split die in the mounting groove portion and inserting the positioning pin into the positioning recess.

6. 2. The deburring device according to claim 1, wherein the mounting body is mounted on any one of a plurality of tool mounting portions of a turret device of an NC lathe.

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