JP3703579B2 - Rotating body inspection method and inspection apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating body inspection technique for inspecting a swing of a rod-shaped rotating body such as a shaft provided with a worm gear.
[0002]
[Prior art]
When manufacturing a shaft having a worm gear, a round bar material may be used and plastically processed by rolling. In this case, an inspection device is used to check whether or not the shaft after completion of machining is manufactured with a predetermined straightness, in particular, whether or not the worm gear portion is manufactured with a predetermined accuracy such as a predetermined straightness or roundness. Used for measurement and inspection. If the product is not processed to a predetermined accuracy by inspection, the product is corrected again or discarded as a defective product.
[0003]
Conventionally, when a shaft-like member such as a shaft formed with a worm gear is used as an object to be inspected to determine whether or not it has a predetermined straightness, that is, to check for runout of the shaft center, a pair of two rollers is conventionally used. Two pairs are provided, one end of the rod-shaped member is supported by one pair of rollers, and the other end is supported by the other pair of rollers, and the driving roller is pressed against the rod-shaped member and rotated. The probe is driven to bring the measuring element into contact with the rod-shaped member.
[0004]
[Problems to be solved by the invention]
However, when the rod-like member is supported on the lower side by using the roller in this way, the roller has the same structure as the ball bearing, so the inner race (inner ring) on the inner side is used. The one in which a large number of balls are mounted between the outer outer race (outer ring) is used. Since such a roller has a backlash in the radial direction between the inner race and the outer race, there is a measurement error of 10 μm inside and outside when the measurement is repeated, and the center axis of the rod-shaped member is more accurate than that. It turns out that the runout cannot be measured.
[0005]
Therefore, it has been attempted to inspect the deflection by supporting both ends of the rod-shaped member with the V block. However, when both ends of the rod-shaped member are supported by the V block, a driving roller is attached to the rod-shaped member. Even if this is pressed and rotated, it is difficult to rotationally drive the rod-shaped member with the driving roller due to the frictional resistance between the rod-shaped member and the support surface of the V block.
[0006]
As a technique for inspecting the unevenness of the tooth surface of the worm formed on the shaft, for example, as described in JP-A-2-248801, a worm wheel that rotates the shaft on which the worm is formed and meshes with the worm is used. There is one that detects the displacement of the worm in the axial direction. Further, as a method for correcting the balance of the rotating body, for example, as described in Japanese Patent Laid-Open No. 3-170039, the correcting material is discharged to an unbalanced position detected by rotating the rotating body. There is.
[0007]
An object of the present invention has been made in view of the above-described problems of the prior art, and is to enable inspection of a deflection or the like of a rod-like member with high accuracy.
[0008]
The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.
[0009]
[Means for Solving the Problems]
Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
[0010]
That is, the inspection method for a rotating body according to the present invention supports a workpiece made of a rotating body at at least two locations separated in the axial direction by a plurality of support blocks having a V-shaped support surface, and supports the workpiece. When the work body is clamped by a chuck member which is pressed against the block and is rotationally driven by a rotating means and is adjusted in a radial direction toward the center of rotation , and the drive body is displaced in the radial direction. The chuck member transmits a rotational force to the workpiece while displacing the driving body in a radial direction, and the workpiece is measured by a probe pressed against the workpiece.
[0011]
The rotating body inspection apparatus according to the present invention includes two support blocks each having a V-shaped support surface for supporting a workpiece made of a rotating body at positions separated from each other in the axial direction, and the respective support blocks. A driving body having a rotation center substantially coinciding with the rotation center of the workpiece, and being driven to rotate by a rotating means; and provided in the driving body so as to be adjustable and movable in a radial direction thereof. A chuck member that transmits the rotation of the driving body to the workpiece, a pressing member that presses the workpiece against the respective support blocks when the workpiece is rotated, and a measuring element that contacts the workpiece and measures the workpiece It is characterized by having.
[0012]
In the present invention, the work, which is the object to be inspected, is supported by two support blocks, and is rotated by transmitting the rotation of the driving body by the chuck member while being pressed against the support block. The The chuck member has a floating structure that can be adjusted and moved in the radial direction toward the center of rotation of the drive body. Even if the drive body is displaced in the radial direction, the displacement is not transmitted to the workpiece by the floating structure. Rotates while being supported by the support block. As a result, the straightness and runout of the workpiece can be measured with high accuracy by the measuring element without the rotation error in the radial direction of the driving body affecting the workpiece.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a diagram showing the entire rotating body inspection apparatus according to an embodiment of the present invention, and a base 11 is provided with an inspection unit 12 and a drive unit 13. The inspection unit 12 includes a support base 14 fixed to the base 11, and a slide block 16 is mounted so as to be slidable in the vertical direction along a guide rail 15 provided on the support base 14. In order to drive along the guide rail 15, a fluid pressure cylinder 17 is attached to the support base 14, and a sliding block 16 is connected to a piston rod 18 of the fluid pressure cylinder 17. The sliding block 16 is provided with a bar-shaped member as an object to be inspected, that is, a pressing roller 21 for pressing the work W, and a contact 22 for contacting the work W and detecting the shake thereof.
[0015]
The base 11 is provided with a work support 23 that is positioned between the inspection unit 12 and the drive unit 13 and supports the work W at one end thereof. As shown, a V block having a V-shaped support surface, that is, a support block 24 is provided.
[0016]
3 is a cross-sectional view showing the drive unit 13 shown in FIG. 1, FIG. 4 is an enlarged cross-sectional view showing the main part in FIG. 3, and FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 3, FIG. 7 is an exploded perspective view showing members constituting the drive unit 13, and FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG.
[0017]
The drive unit 13 includes a support base 25 fixed to the base 11, and a cylindrical tubular body 26 is attached to the support base 25, and an annular drive member is disposed outside the cylindrical body 26 via a bearing 27. A pulley 28 is rotatably mounted. In order to rotate the pulley 28, a motor 31 is attached to the support base 25, and a timing belt 33 is stretched between the pulley 32 and the pulley 28 attached to the main shaft of the motor 31. An annular gear may be used in place of the pulley 28 as the annular driving member, and a gear driven by a motor may be engaged with the pulley 28. A sprocket wheel is attached to the annular driving member, and the motor is rotated using a chain. You may make it interlock | cooperate with an annular drive member.
[0018]
A mounting block 35 is attached to the support base 25 via a fixed block 34 fixed to the support base 25, and a tip of the mounting block 35 has a V-shaped support surface as shown in FIG. The V block, that is, the support block 36 is fixed. Accordingly, the right end portion of the workpiece W is supported by the support block 36, and both the two support blocks 24 and 36 are predetermined with respect to the base 11 by the workpiece support base 23 and the support base 25. It is attached with rigidity.
[0019]
A support shaft 38 for rotatably supporting the operation claw members 45 and 46 is fixed to the drive block 37 fixed to the pulley 28 by a screw member 37a shown in FIG. As shown in FIG. 8, a groove 38a extending in the radial direction toward the rotation center O of the pulley 28 is formed, and the tip 39a of the support pin 39 is slidable along the groove 38a. Is engaged. A chuck member 41 is screwed to the support pin 39 to a screw portion 39b formed on the support pin 39, and a chuck member 42 is rotatably fitted to the support pin 39 with a predetermined clearance. As described above, the chuck pin 41 and 42 are attached to the support pin 39 so as to be swingable with the center of the support pin 39 as the center of rotation.
[0020]
As shown in FIG. 7, the tip portions of the chuck members 41 and 42 have substantially the same width as each other, and V-shaped chuck surfaces 41a and 42a for gripping the workpiece W are formed on the tip portions. Is formed. In order to bias the chucking force for gripping the workpiece W, two tension coil springs 43 are attached to the tip portions of the chuck members 41 and 42 as shown in FIG. In a state where the chuck members 41 and 42 are closed by the tension coil springs 43, the chuck members 41 and 42 are screwed to one of the chuck members 42 in order to regulate the position where the tips of the chuck members 41 and 42 are closed. The stopper 44 comes into contact with the other chuck member 41.
[0021]
Accordingly, when the pulley 28 is rotated while the right end portion of the work W is supported by the support block 36, the left end portion is supported by the support block 24, and the work W is clamped by the chuck members 41 and 42, the chuck member is rotated. As shown in FIG. 8, the rotational force is transmitted to the pins 41 and 42 by the support pin 39 around the rotation center O of the pulley 28.
[0022]
The rocking center portions of the chuck members 41 and 42 are approximately half the thickness of the tip portion, and these rocking center portions overlap each other. And the front-end | tip part 39a of the support pin 39 which supports the chuck members 41 and 42 swingably becomes slidable in the radial direction of the pulley 28 along the groove | channel 38a formed in the head of the support shaft 38, and this The chuck members 41 and 42 are floating in the direction.
[0023]
Therefore, when the workpiece W is sandwiched between the tip portions of the chuck members 41 and 42, the workpiece W is connected to the pulley 28 for driving the chuck via the chuck members 41 and 42. When the pulley 28 is driven by the motor 31 in this state, the workpiece W is rotationally driven via the chuck members 41 and 42. During this rotation, since the pulley 28 is mounted on the cylindrical body 26 by the bearing 27, the chuck members 41, 42 may be displaced in the micron order in the radial direction by the radial play of the bearing 27. Since the chuck member 41 has a structure that floats in the radial direction of the pulley 28, the displacement is not transmitted to the workpiece W even if it is displaced.
[0024]
As shown in FIG. 6, two operating claw members 45 and 46 are rotatably attached to the support shaft 38 corresponding to the two chuck members 41 and 42. The engaging pins 47 and 48 are fixed. As shown in FIG. 9, each of the engagement pins 47 and 48 has heads 47 a and 48 a at the tip, and these heads 47 a and 48 a overlap with the chuck members 41 and 42. Thus, the chuck members 41 and 42 are prevented from falling off the support shaft 38.
[0025]
The engaging pins 47 and 48 are formed with small diameter portions 47b and 48b that contact the concave surfaces 41b and 42b formed on the chuck members 41 and 42, and tapered portions 47c and 48c and 47d and 48d located on both sides thereof. ing. Each of the small diameter portions 47b and 48b has a length substantially equal to the thickness of the concave surfaces 41b and 42b of the chuck members 41 and 42. Then, under the state where the chuck members 41 and 42 are closed, the small diameter portions 47b and 48b of the engagement pins 47 and 48 are separated from the concave surfaces 41b and 42b as shown in FIG.
[0026]
In order to set the operating claw members 45 and 46 to a predetermined opening degree, a spring member 49 is mounted between them as shown in FIG. 7, and the operating claw members 45 and 46 resist this spring force. As shown in FIG. 1, a chuck opening / closing unit 51 is provided on the base 11. The chuck opening / closing unit 51 has an actuator 53 provided at the tip of a piston rod 52 that is actuated in the vertical direction by the fluid pressure cylinder 17, and at the tip thereof, as shown in FIGS. A tapered portion 53a that enters between the members 45 and 46 is formed.
[0027]
When the actuator 53 is inserted between the operating claw members 45 and 46, the rotational position of the pulley 28 is set to a predetermined position so that the operating claw members 45 and 46 are directly above the actuator 53. In this state, since the respective operating claw members 45 and 46 are rotatably mounted on the support shaft 38 so as not to be loose, the opening degree is always a predetermined opening degree.
[0028]
As shown in FIGS. 5 to 7, when the actuator 53 is away from the operating claw members 45 and 46, the chuck members 41 and 42 are closed, and the workpiece W is clamped. When the pulley 28 is rotated in this state and the workpiece W is rotated, even if the chuck members 41 and 42 are displaced in the radial direction of the pulley 28 due to misalignment or vibration of the workpiece W, the operation pawl members 45 and 46 Since the small-diameter portions 47b and 48b of the engaging pins 47 and 48 fixed to the chuck pins 41 and 42 are not in contact with the chuck members 41 and 42, the chuck members 41 and 42 have a floating action in the radial direction of the pulley 28.
[0029]
On the other hand, when the operation claw members 45 and 46 are positioned right above the actuator 53 and the actuator 53 is advanced with the pulley 28 stationary, the movement between the two operation claw members 45 and 46 is ensured. The actuator 53 enters, and the engaging pins 47 and 48 move in directions away from each other. At this time, even if the chuck members 41 and 42 are displaced in the axial direction of the engagement pins 47 and 48 as indicated by a two-dot chain line in FIG. 9, the respective engagement pins 47 and 48 are tapered portions 47c and 47d. 48c and 48d are formed on both sides of the small diameter portions 47b and 48b, so that the concave surfaces 41b and 42b of the chuck members 41 and 42 do not cause backlash in the small diameter portions 47b and 48b of the respective engagement pins 47 and 48. The chuck members 41 and 42 are opened at a predetermined opening degree.
[0030]
5 and 6, the state where the operating claw member 45 is rotated by a predetermined angle by the actuator 53 is as shown by a two-dot chain line. The operating claw member 45 is provided on the operating claw member 45 by rotating. A state in which the engaged pin 47 is engaged with the concave surface 41b of the chuck member 41 and the chuck member 41 is rotated by a predetermined angle is indicated by a two-dot chain line.
[0031]
10A is an arrow view taken along line 10A-10A in FIG. 1, and FIG. 10B is a cross-sectional view taken along line 10B-10B in FIG. As shown in FIG. 10B, a swing arm 55 is attached to the support base 25 so as to be swingable about a pin 56, and the tip of an operating rod 57 fixed to the tip of the swing arm 55. The pressing roller 58 is rotatably provided. By driving the swing arm 55, the pressing roller 58 is operated to the position where the workpiece W is pressed as shown in FIG. 6 and the position of the two-dot chain line away from the position as shown in FIG. Further, a fluid pressure cylinder 61 is attached to the support base 25, and its piston rod 62 is connected to the swing arm 55 via a joint 63.
[0032]
The workpiece W is supported by the two support blocks 24 and 36 at both ends, and one end is pressed by the pressing roller 21 and the other end is pressed by the pressing roller 58, and is supported by the support blocks 24 and 36. However, in order to regulate the supporting position, as shown in FIG. 3, a positioning rod 64 is provided on the mounting block 35 and is detachable by a clamp lever 65. By changing the position of the positioning rod 64 in the axial direction, the position of the workpiece W in the axial direction can be adjusted.
[0033]
On the other hand, in order to bring the workpiece W into contact with the front end surface of the positioning rod 64, a fluid pressure cylinder 66 is attached to the support 14 of the inspection unit 12, and the piston rod 67 is opposed to the positioning rod 64. And is concentric.
[0034]
The procedure of the method of inspecting the shake of the rotating body using the rotating body inspection apparatus having the above configuration will be described. The actuator 53 is moved forward by positioning the two operating claw members 45 and 46 directly above the actuator 53. The two operating claw members 45 and 46 are opened to open the chuck members 41 and 42, and the sliding block 16 having the pressing roller 21, that is, the sliding unit is retracted upward as shown in FIG. At the same time, a rod-like rotating body, which is a workpiece W, is placed on each of the support blocks 24 and 36 under the state where the pressing roller 58 is retracted to the position indicated by the two-dot chain line in FIG.
[0035]
In this state, the fluid pressure cylinder 66 is operated to advance the piston rod 67 so that the workpiece W comes into contact with the positioning rod 64. Thereby, the position of the workpiece W in the axial direction is set to a predetermined position. In this state, the piston rod 67 is moved backward from the workpiece W. Next, when the pressing rollers 21 and 58 are pressed against the workpiece W and the actuator 53 is moved backward, the workpiece W is fastened by the chuck members 41 and 42 as shown in FIGS. At this time, the contact 22 comes into contact with the portion of the worm gear G formed on the workpiece W.
[0036]
Next, when the motor 31 is driven to rotate the pulley 28 for rotating the chuck, which is a driving body, the pulley 28 is fastened to the work W via the chuck members 41, 42. It is rotationally driven by. The rotation speed of the workpiece W is set to about 3 rotations per second.
[0037]
During this rotation, since the pulley 28 is rotatably mounted on the bearing 27, it is inevitable that the pulley 28 is displaced in the radial direction due to the backlash of the bearing 27, but the chuck members 41 and 42 are connected to the pulley 28 with respect to the support shaft 38. Therefore, the chuck members 41 and 42 are prevented from moving in a radial direction from the workpiece W, and the workpiece W is prevented from moving away from the support blocks 24 and 36. Therefore, the workpiece W is always brought into contact with the support surfaces of the support blocks 24 and 36, and the center of rotation is at a predetermined radial position from the V-shaped support surfaces of the support blocks 24 and 36. As a result, the shaft wobble of the workpiece W can be measured and inspected with high accuracy. According to experiments, it has been found that the accuracy of repeated measurement is as high as ± 1 μm.
[0038]
In the illustrated inspection apparatus, the pulley 28 is driven by a motor 31, and the rotation of the pulley 28 and the rotation of the work W are synchronized, so the relative position between the pulley 28 and the motor 31. Can be directly detected from the signal of the motor 31. If the workpiece W is rotated a plurality of times, it is detected when the wobble position of the workpiece W is the same rotation angle at every predetermined rotation angle. Even when an error occurs in the shake amount, it is easy to calculate an average shake amount at that position, or to position the operation pawl members 45 and 46 directly above the actuator 53, and the like.
[0039]
After the measurement is completed, when the tip of the actuator 53 is inserted between the two operating claw members 45 and 46 with the chuck members 41 and 42 positioned right above the actuator 53, the engagement pins 47 attached to the respective actuator pins 47 are attached. , 48 are engaged with concave surfaces 41b, 42b formed on the chuck members 41, 42, and the chuck members 41, 42 rotate about the support pins 39, respectively. Will be opened.
[0040]
As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.
[0041]
For example, in the illustrated embodiment, the work is rotated while being held in a horizontal state, but the work may be rotated while being held in a vertical state. The actuator 53 of the chuck opening / closing unit 51 moves up and down directly below the chuck members 41 and 42. However, the actuator 53 may be moved horizontally to open and close both chuck members 41 and 42 from the side. . Furthermore, the object to be inspected is not limited to a rod-like rotating body as shown in the figure, and can be applied not only to straightness and runout of a rotating member, but also to inspection of a tooth surface.
[0042]
【The invention's effect】
Of the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.
[0043]
(1) The workpiece can be rotated while being supported on the V-shaped support surface of the support block, and inspection of workpiece deflection and the like can be performed with high accuracy.
[0044]
(2) Since the rotation of the driving body for rotating the workpiece is transmitted through the chuck member having a floating structure, even if there is a backlash in the radial direction in the driving body for rotating the chuck member, the backlash Can be inspected with high accuracy without being transmitted to the workpiece.
[Brief description of the drawings]
FIG. 1 is a front view showing a rotating body inspection apparatus according to an embodiment of the present invention.
FIG. 2 is a view taken along line 2-2 in FIG.
FIG. 3 is an enlarged sectional view showing a part of FIG. 1;
4 is an enlarged cross-sectional view of a part of FIG. 3;
5 is a cross-sectional view taken along line 5-5 in FIG.
6 is a cross-sectional view taken along line 6-6 in FIG.
FIG. 7 is an exploded perspective view showing members constituting the drive unit.
8 is a cross-sectional view taken along line 8-8 in FIG.
9 is a cross-sectional view taken along line 9-9 in FIG.
10A is a cross-sectional view taken along line 10A-10A in FIG. 1, and FIG. 10B is a cross-sectional view taken along line 10B-10B in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Base 12 Test | inspection part 13 Drive part 14 Support stand 15 Guide rail 16 Sliding block 17 Fluid pressure cylinder 18 Piston rod 21 Pressing roller 22 Contact 23 Work support stand 24 Support block 25 Support stand 26 Cylindrical body 27 Bearing 28 Pulley ( Driving body)
31 Motor 32 Pulley 33 Timing belt 34 Fixed block 35 Mounting block 36 Support block 37 Drive block 38 Support shaft 39 Support pin 41, 42 Chuck member 43 Tension coil spring 44 Stopper 45, 46 Actuation claw member 47, 48 Engagement pin 51 Chuck Opening / closing unit 52 Piston rod 53 Actuator 55 Swing arm 56 Pin 57 Actuating rod 58 Pressing roller 61 Fluid pressure cylinder 62 Piston rod 63 Joint 64 Positioning rod 65 Clamp lever W Workpiece (inspection object, rod-shaped rotating body)

Claims (2)

With a plurality of support blocks having a V-shaped support surface, the workpiece made of a rotating body is supported at at least two locations separated in the axial direction, and the workpiece is pressed against the support block;
The workpiece is clamped by a chuck member provided on a driving body that is rotationally driven by a rotating means so as to be adjustable and movable in the radial direction toward the center of rotation .
When the driving body is displaced in the radial direction, the chuck member transmits a rotational force to the workpiece while displacing the driving body in the radial direction,
A method of inspecting a rotating body, characterized in that the workpiece is measured by a probe pressed against the workpiece. Two support blocks each having a V-shaped support surface for supporting a workpiece made of a rotating body at positions separated from each other in the axial direction;
A driving body having a rotation center substantially coinciding with the rotation center of the workpiece supported by each of the support blocks, and being driven to rotate by a rotating means;
A chuck member that is provided on the drive body so as to be adjustable and movable in the radial direction, and that clamps the work and transmits the rotation of the drive to the work;
A pressing member that presses the work against each of the support blocks when the work is rotated;
An inspection device for a rotating body, comprising: a measuring element that contacts the workpiece and measures the workpiece.

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