JP6949148B2 - Work inspection device - Google Patents

Description

The present invention relates to a work inspection device capable of easily changing and adjusting the distance between a pair of contacts.

In machining of machine tools and the like, the machining dimensions of the machined workpiece are strictly controlled. For the dimensional control, the machining dimensional measurement of the work is performed by the work inspection device incorporated in the processing machine or an independent inspection machine. Patent Document 1 below discloses a conventional example of such a work inspection device. This inspection device measures dimensions by contacting a pair of contacts with a work. Specifically, a pair of arms are provided on the main body of the apparatus, and contacts that come into contact with the work are attached to the tips of the arms. The pair of arms are attached via leaf springs, and the contacts at the time of inspection can be moved by the deflection of the leaf springs. Then, the amount of movement in the pair of contacts is detected as an electric signal by the differential transformer, and the detection signal is sent to the arithmetic unit to inspect the workpiece.

Japanese Unexamined Patent Publication No. 2009-14552

By the way, in the inspection of the machined work, it is necessary to change and adjust the interval between the pair of contacts according to the size of the machined work to be the target. In this respect, in the conventional inspection device, setup changes such as replacement of the measurement head provided with the contactor and replacement of the inspection device itself have been performed. However, in such a setup change, the measuring head provided with the contact had to be removed, and the signal line or the like connected to the measuring head had to be temporarily disconnected. Some inspection devices use compressed air to operate the moving parts, and in such cases, the air pipes and the like must be removed, which is a very time-consuming task. Further, the inspection device is required to have measurement accuracy. For example, in the inspection of a machined work, the accuracy for measuring a tolerance of about 0.5 mm is required. Therefore, in the conventional structure in which the measurement head needs to be attached / detached for setup change, accurate assembly is difficult, and fine adjustment may be repeated, which may take a long time for the work.

Therefore, an object of the present invention is to provide a work inspection device that easily changes and adjusts a pair of contacts in order to solve such a problem.

In the work inspection device according to one aspect of the present invention, a pair of measuring heads provided with contacts for measuring the distance between two points by contact with an object and the pair of measuring heads are integrally provided. It is located between the two adjustment slides, the guide rail on which the two adjustment slides are movably assembled, and the two adjustment slides, and is adjusted to the measurement dimensions performed by the pair of contacts. It has a spacer member of a size and a positioning mechanism for stopping the movement of the two adjusting slides sandwiching the spacer member, and the positioning mechanism has a long hole formed and a piece above the adjusting slide. It has a holding plate and an indirect block attached to each of the two adjusting slides with a slight gap between the stop plate and the two lever clamps, each of which has a threaded portion. each of the a which was screwed to the indirect block, on the other hand the threaded portion one right screw shape of the two levers clamping a left-handed thread corresponding through the slot from above the stop plate By tightening the screw, the movement of the adjusting slide is regulated by the frictional force.

According to the above configuration, by moving the adjusting slide along the guide rail, the measuring head moves integrally with the adjusting slide, and a spacer having a size adjusted to the measurement dimension is provided between the pair of measuring heads. By sandwiching the member and stopping the movement of the adjusting slide by the positioning mechanism in that state, the distance between the pair of contacts can be easily changed and adjusted according to the object.

It is a side view of the inspection device provided with one embodiment of the work inspection device. It is a side view which showed one Embodiment of the work inspection apparatus. It is a front view which showed one Embodiment of the work inspection apparatus. It is a top view which showed one Embodiment of the work inspection apparatus. It is a figure which showed the state which the inner diameter of a work is measured by a pair of contacts. It is a figure which showed the state which the inner diameter of a work is measured by a pair of contacts. It is a figure which showed the positioning state of 3 types with different work sizes about the positioning mechanism of a work inspection apparatus.

Next, an embodiment of the work inspection device according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view of an inspection machine provided with the work inspection device of the present embodiment. The inspection machine 1 is arranged side by side with a machine tool such as a lathe, and the work W after processing is conveyed from the machine tool by the automatic work transfer machine. In the inspection machine 1, a vertically standing support column 4 is fixed on a table 3 having legs with an adjuster function, and an elevating slide 6 is attached to a guide rail 5 formed on the front surface of the support column 4. ing. The work inspection device 7 of the present embodiment is attached to the elevating slide 6, and can be moved between the raised retracted position and the illustrated lowered inspection position by the expansion / contraction operation of the air cylinder 8.

In the inspection machine 1, a work table 11 is provided on the table 3 so that the work W conveyed by the automatic work transfer machine can be received. A beam member 12 is fixed on the table 3 so as to be orthogonal to the support column 4 toward the front of the machine body (right side in the drawing), and a guide rail 13 is provided on the beam member 12. A horizontal slide 14 is attached to the guide rail 13, and a work table 11 is fixed on the horizontal slide 14. The piston rod of the air cylinder 15 is also connected to the horizontal slide 14, and the position of the work table 11 can be switched by the expansion / contraction operation thereof. By the extension operation of the air cylinder 15, it moves to the work receiving position at the front part of the machine body, and by the contraction operation, it moves to the inspection position at the rear part of the machine body shown in the figure.

Next, FIGS. 2 to 4 are a side view, a front view, and a plan view showing the work inspection device 7. The work inspection device 7 is provided with a pair of measurement heads 22 in the left-right width direction, and contacts 21 are attached to the measurement heads 22 so as to face downward. The two measuring heads 22 are attached to the slide mechanism via different brackets 23, and have a structure capable of independently moving in the left-right width direction.

As shown in FIG. 2, a support block 25 standing upright in the vertical direction is fixed to the elevating slide 6, and a guide rail 26 is fixed to the front surface of the support block 25 in a horizontal state. A pair of adjusting slides 27 are slidably attached to the guide rail 26. The adjusting slide 27 is a guide block constituting the guide rail 26 and the bearing slide. Therefore, the work inspection device 7 can change and adjust the distance between the pair of contacts 21 while maintaining the vertical posture by moving the pair of adjustment slides 27 to the left and right on the horizontal guide rail 26. It has become.

Here, FIGS. 5 and 6 are views showing a state in which the inner diameter of the work W is measured by a pair of contacts 21. The workpieces W1 and W2 having different diameters are shown. For example, the workpiece W1 in FIG. 5 has an inner diameter of 20 mm, and the workpiece W2 in FIG. 6 has an inner diameter of 78 mm. In the measuring head 22 of the present embodiment, the contact 21 slightly swings in the width direction when viewed from the front side of the work inspection device 7, and as shown in the figure, the tip portion hits the inner surface of the work W and is a reference of the contact 21. It is configured so that the amount of displacement from the position is detected.

For example, the measuring head 22 is configured with a movable portion in which a pair of contacts 21 swing outward (in a direction away from each other) by a spring. The movable portion is also provided with a piston for swinging the pair of contacts 21 inward against the spring force. The piston is operated by the supply and exhaust of compressed air, and the measurement with respect to the contact 21 is performed by air pressure control. Further, the measurement head 22 is provided with a detection sensor that detects the displacement amount of the contactor 21, and is configured to transmit the detection signal to the arithmetic processing unit of the inspection machine 1 that executes the inspection processing of the workpiece. There is.

In the work inspection device 7, the reference position at the time of measurement is adjusted for the assembled measurement head 22. The reference position is adjusted by setting the master work on the work table 11 and setting the position where the tip of the contactor 21 is applied to the inner surface of the master work as the reference position. As described in the above-mentioned problem, the accuracy of measuring the tolerance of about 0.5 mm is high, and the alignment of the measuring head 22 is a difficult task. Therefore, it is difficult to make fine adjustments because the conventional work inspection device has a structure in which the measurement head is replaced. In addition, handling of signal lines connected to the detection sensor and air pipes for operating the contacts was a laborious task.

In this respect, in the present embodiment, in order to eliminate such removal, the measurement head 22 is mounted on the adjustment slide 27. That is, even if the size of the work W to be processed changes, it can be used as it is by changing and adjusting the reference position for the pair of measurement heads 22. Further, in order to facilitate the adjustment of the reference position described above, the adjustment spacer 28 is sandwiched between the brackets 23. The adjusting spacer 28 determines the distance between the pair of measuring heads 22, that is, the pair of contacts 21.

The distance between the pair of contacts 21 is determined by the closest contact state in which the pair of adjusting slides 27 sandwich the adjusting spacer 28. At that time, in order to improve the accuracy, the pair of adjusting slides 27 are positioned so as to be pressed against each other. Further, since the position is displaced only by sandwiching the adjusting spacer 28 between the pair of adjusting slides 27, a positioning mechanism for stopping the movement of the adjusting slide 27 is provided. However, since the adjustment slide 27 is a guide block constituting the bearing slide, it is not preferable that a strong force for restricting the movement is applied.

Therefore, in the work inspection device 7 of the present embodiment, the adjusting spacer 28 is sandwiched between the brackets 23, and a positioning mechanism for restricting the movement of the brackets 23 is configured. As shown in FIG. 2, the positioning mechanism is screwed to the upper end of the support block 25 in an upright posture in a cantilevered state so that the stop plate 31 protrudes forward. The stop plate 31 has a notch 311 formed at a position where the adjusting spacer 28 is attached, and is arranged above the pair of left and right brackets 23 as shown in FIG.

In the bracket 23, a plate-shaped vertical block 231 screwed to the adjustment slide 27 and a plate-shaped horizontal block 232 to which the measuring head 22 is attached are joined in an L shape, and are further arranged so as to be orthogonal to both. Support plate 233 is joined. A long hole 235 is formed in the horizontal block 232 in the front-rear direction of the machine body, and the measurement head 22 is fixed to the lower side by a bolt 33 through the long hole 235. The measuring head 22 of the present embodiment is provided with a contact 21 for measuring the inner diameter of the work W, but the work inspection device 7 is provided with a contact corresponding to the measurement of the outer diameter of the work W and the like. It is also possible to replace it with a measuring head.

The stop plate 31 is formed with two elongated holes 312 that are long in the left-right width direction. The elongated holes 312 are formed corresponding to the moving range of the measuring head 22, and a pair of lever clamps 32 through which the threaded portions 321 penetrate the elongated holes 312 are provided on the upper portion of the stop plate 31. There is. The threaded portion 321 of the lever clamp 32 penetrating the elongated hole 312 is screwed into the female threaded portion formed in the vertical block 231 of the bracket 23.

In the lever clamp 32, serrations are formed in the threaded portion 321 and the rotation of the lever portion is normally transmitted to the threaded portion 321 by the meshing of the grooves. It is configured so that rotation is not transmitted. In the positioning mechanism, when the screw portion 321 is turned in the tightening direction by the lever operation of the lever clamp 32, the distance from the vertical block 231 is shortened, and the cantilever support stop plate 31 is pressed downward and bends. ing. Since the stop plate 31 has only a slight gap of about 0.4 mm from the vertical block 231 in a normal horizontal posture, the stop plate 31 is pressed against the upper surface of the vertical block 231 by bending. Therefore, the movement of the adjusting slide 27 is restricted by the frictional resistance between the stop plate 31 pressed against each other and the vertical block 231.

Next, FIG. 7 is a diagram showing a part of the positioning mechanism, and shows three types of work W having different sizes A, B, and C. Adjusting spacers 28 (28a, 28b, 28c) made for each size are replaced as needed. The adjusting spacer 28 is formed with a main body portion 282 sandwiched by a pair of brackets 23 (vertical blocks 231) from both the left and right sides, and a grip portion 281 having a hooking hole for organizing. A gourd-shaped positioning hole 283 is formed in the main body portion 282. On the other hand, the guide rail 26 is attached to the guide rail 26 at a position shown in FIG. 3 so that a positioning bolt 34 having a screwed tip portion protrudes toward the front side. The adjusting spacer 28 is attached so that the head portion of the bolt 34 is passed through the positioning hole 283.

Subsequently, according to the inspection machine 1 having the above configuration, the machine tool transfers the machined work W by the automatic work transfer machine. At that time, the work table 11 on the horizontal slide 14 is at the work receiving position at the front part of the machine body by the extension operation of the air cylinder 15, and the processed work W is delivered onto the work table 11. After that, the work W moves to the inspection position shown in FIG. 1 by the contraction operation of the air cylinder 15. Next, the work inspection device 7 moves from the raised retracted position to the lowered inspection position shown in FIG. 1 by the expansion / contraction operation of the air cylinder 8. At this time, the amount of displacement when the contactor at the lower end of the contact type displacement measuring head 29 extending downward hits the upper surface of the work W is detected, and the thickness of the work W is calculated.

As shown in FIGS. 5 and 6, the work inspection device 7 that has moved to the inspection position enables measurement by inserting a pair of contacts 21 into the work W (W1, W2). The measuring head 22 at the time of insertion swings in the direction in which the pair of contacts 21 approach each other by receiving a force from a piston operated by compressed air, and is inserted into the work W in a closed state. Then, after the insertion, the pair of contacts 21 swings in the direction of separation due to the spring force due to the release of the compressed air, and the tip portion is applied to the inner surface of the work as shown in the figure. The position of the contactor 21 at this time is detected by the detection sensor in the measuring head 22, and the detection signal is sent to the arithmetic processing unit of the measuring instrument 1 to calculate the inner diameters of the workpieces W1 and W2 to determine the machining dimensions. Inspection is carried out.

In the measurement of the work inspection device 7, the contacts 21 swing and come into contact with the work W, but since the amount of swing is small, it is necessary to change the mounting position of the pair of contacts 21 for each size of the work W. become. For example, when it is necessary to change from the work W1 to the work W2, the change adjustment of the mounting position of the measurement head 22 is performed as follows. Specifically, the positioning mechanism shown in FIG. 7 is rearranged from the A type to the C type. First, the lever clamp 32 is turned in the loosening direction of the screw portion 321. Then, the cantilever support stop plate 31 released from the load returns to the horizontal state and becomes a non-contact state away from the vertical block 231.

Therefore, the pair of adjusting slides 27 move in the left-right separated directions along the guide rail 26, the adjusting spacer 28a is removed, and the adjusting spacer 28c is attached instead. At this time, the threaded portion 321 of the lever clamp 32 moves in the elongated hole 312, and the adjusting slide 27, the bracket 23, and the measuring head 22 move together. After that, the pair of adjusting slides 27 are brought close to each other, and the adjusting spacer 28c is sandwiched between both vertical blocks 231. Then, the lever clamp 32 is turned in the direction of tightening the screw portion 321 while the adjusting spacer 28c is pressed from both sides by the vertical block 231. By tightening the lever clamp 32, the cantilever support stop plate 31 is bent and pressed against the vertical block 231, and the movement of the adjustment slide 27 is restricted by frictional resistance.

Therefore, in the present embodiment, since the measuring head 22 is not removed for the change adjustment of the mounting position of the measuring head 22, it is not necessary to remove the signal line, the air pipe, etc. connected to the measuring head 22, and the work load of the setup change is not required. Is greatly reduced. Further, since no tool is used for the setup change, the work is easy and the time can be shortened. Further, by eliminating the attachment / detachment of the measurement head 22, it is possible to avoid causing the contactor 21 to come into contact with something at the time of replacement as in the conventional case, resulting in a problem. Further, the adjusting spacer 28 can be easily attached to a predetermined position by inserting the positioning bolt 34 into the gourd-shaped positioning hole 283.

According to the work inspection device 7 of the present embodiment, the distance between the pair of contacts 21 is uniquely determined by the adjusting spacer 28 used. Therefore, even if extremely fine adjustment is required as described above, the measurement head 22 can be changed and adjusted accurately and easily. However, it is necessary to tighten the lever clamp 32 in a state where the adjusting spacer 28 is correctly sandwiched between the pair of vertical blocks 231. Regarding this point, since the movement of the adjusting slide 27 is restricted by the frictional resistance when the stop plate 31 is slightly bent, the screw portion 321 of the lever clamp 32 is not strongly tightened, and the deviation that occurs at the time of tightening is not performed. Can be suppressed.

Further, in the work inspection device 7 that does not use a tool, the work inspection device 7 can also be sandwiched by the pair of vertical blocks 231 while the operator holds the support plates 233 against each other with respect to both brackets 23. Therefore, the vertical block 231 and the adjusting spacer 28 can be correctly positioned so that a gap does not occur. A jig may be used to press the support plates 233 together. However, when the adjustment slide 27 is positioned by operating the lever clamp 32, the vertical block 231 may be separated from the adjustment spacer 28 due to the backlash of the screw portion 321 and the accuracy required for inspection may not be obtained.

Therefore, the screw portions 321 constituting the pair of lever clamps 32 are screwed to the right on one side and to the left on the other side so that the vertical block 231 moves toward the adjusting spacer 28 when tightened. To. Therefore, by tightening the lever clamp 32 with the pair of adjustment slides 27 sandwiching the adjustment spacer 28, the vertical block 231 is pressed against the adjustment spacer 28 by the amount of play in the screw portion 321. Accurate positioning is possible.

Although one embodiment of the present invention has been described above, the present invention is not limited to these, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, a lever clamp 32 using screw tightening is used as a configuration for pressing the cantilever support stop plate 31 against the vertical block 231. However, a lever is used instead of the lever clamp 32. It may be used as a cam lever.
Further, for example, the work inspection device 7 of the above-described embodiment has a configuration in which an operator manually moves the adjustment slide 27 and tightens the screw portion 321. These movements are performed by using a servomotor or the like. It may be automated.

1 ... Inspection machine 7 ... Work inspection device 21 ... Contact 22 ... Measurement head 23 ... Bracket 25 ... Support block 26 ... Guide rail 27 ... Adjustment slide 28 (28a, 28b, 28c) ... Adjustment spacer 31 ... Stop Plate 32 ... Lever clamp 231 ... Vertical block 321 ... Threaded part

Claims (2)

A pair of measuring heads equipped with contacts for measuring the distance between two points by contact with an object,
Two adjustment slides in which the pair of measuring heads are integrally provided, and
A guide rail with the two adjustment slides movably assembled, and
A spacer member that is located between the two adjustment slides and has a size that matches the measurement dimensions performed by the pair of contacts.
It has a positioning mechanism for stopping the movement of the two adjusting slides sandwiching the spacer member.
The positioning mechanism has an elongated stop plate formed and cantilevered above the adjustment slide, and an indirect attachment to the two adjustment slides with a slight gap between the stop plate and the stop plate. The two lever clamps have a block, and each threaded portion is screwed into the corresponding indirect block from above the stop plate through the elongated hole, and the shape of the threaded portion is the one and the other in the right screw of each screw of said two levers clamp is left screw tightening, workpiece detector device is intended to regulate the frictional force the movement of the adjustment slide. Attached as before Symbol guide rail positioning bolt protrudes, a positioning hole into which a head portion of the positioning bolt into the spacer member is formed, the mounting structure for arranging the spacer member to a predetermined position of the guide rail The work inspection device according to claim 1 provided.

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