WO2019155535A1

WO2019155535A1 - Workpiece inspection device

Info

Publication number: WO2019155535A1
Application number: PCT/JP2018/004110
Authority: WO
Inventors: 福岡大祐
Original assignee: 株式会社Ｆｕｊｉ
Priority date: 2018-02-07
Filing date: 2018-02-07
Publication date: 2019-08-15
Also published as: JP6949148B2; JPWO2019155535A1

Abstract

Provided is a workpiece inspection device which is capable of easily changing and adjusting a pair of contacts, the workpiece inspection device comprising: a pair of measurement heads, each equipped with a contact for measuring, through contact with an object, the distance between two points; two adjustment slides which are integrally provided with the respective measurement heads; a guide rail to which the two adjustment slides are movably mounted; a spacer member having a size that matches the measurement dimension of measurement performed by the pair of contacts; and a positioning mechanism for stopping movement of the two adjustment slides between which the spacer member is sandwiched.

Description

Work inspection equipment

The present invention relates to a workpiece inspection apparatus 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 managed. For the dimension management, machining dimension measurement for a workpiece is performed by a workpiece inspection device incorporated in the processing machine or in an independent inspection machine. Patent Document 1 below discloses a conventional example of such a workpiece inspection device. This inspection apparatus measures a dimension by a pair of contacts contacting a workpiece. Specifically, a pair of arms is provided in the apparatus main body, and contacts that contact the workpiece are assembled to the ends of the arms. The pair of arms are attached via a leaf spring, and a contactor at the time of measurement is structured to be movable by bending of the leaf spring. Then, the amount of movement of the pair of contacts is detected as an electrical signal by the differential transformer, and the detected signal is sent to the arithmetic device to perform inspection of the workpiece.

JP 2009-14552 A

By the way, in the inspection of the workpiece, it is necessary to change and adjust the distance between the pair of contacts according to the size of the target workpiece. In this regard, in the conventional measuring apparatus, a setup change such as replacement of a measuring head provided with a contactor or replacement of the measuring apparatus itself has been performed. However, such a setup change had to remove a measuring head provided with a contact, and had to once disconnect a signal line connected thereto. Some inspection devices use compressed air to actuate the moving parts. In such a case, the air pipe and the like must be removed, which is a very time-consuming operation. In addition, measurement accuracy is required for the inspection device. For example, in inspection of a workpiece, 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 and detached for the setup change, it is difficult to accurately assemble, and it may take a long time to repeat the fine adjustment.

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

In the workpiece inspection apparatus according to one aspect of the present invention, a pair of measurement heads each including a contact for measuring a distance between two points by contact with an object, and the pair of measurement heads are integrally provided. The two adjusting slides, the guide rails in which the two adjusting slides are movably assembled, a spacer member having a size corresponding to a measurement dimension performed by the pair of contacts, and the spacer member being sandwiched A positioning mechanism for stopping the movement of the two adjusting slides.

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

It is a side view of an inspection machine provided with one embodiment of a work inspection device. It is the side view which showed one Embodiment of the workpiece inspection apparatus. It is the front view which showed one Embodiment of the workpiece inspection apparatus. It is the top view which showed one Embodiment of the workpiece inspection apparatus. It is the figure which showed the state which is measuring the internal diameter of a workpiece | work with a pair of contactor. It is the figure which showed the state which is measuring the internal diameter of a workpiece | work with a pair of contactor. It is the figure which showed three types of positioning states from which a workpiece | work size differs regarding the positioning mechanism of a workpiece | work inspection apparatus.

Next, an embodiment of a workpiece inspection apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a detector equipped with the workpiece inspection device of the present embodiment. The inspection machine 1 is arranged with a machine tool such as a lathe, and a workpiece W after being processed is conveyed from the machine tool by an automatic workpiece transfer machine. In the detector 1, a support column 4 standing vertically 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 workpiece inspection device 7 of the present embodiment is attached to the lift slide 6 and is movable between an elevated retracted position and a lowered inspection position shown in the figure by an expansion / contraction operation of the air cylinder 8.

The inspection machine 1 is provided with a work table 11 on a table 3 so that a work W conveyed by an automatic work conveyance machine can be received. On the table 3, a beam member 12 is fixed to the front of the machine body (right side in the drawing) perpendicular to the column 4, and a guide rail 13 is provided thereon. A horizontal slide 14 is attached to the guide rail 13, and a work table 11 is fixed thereon. The piston rod of the air cylinder 15 is also connected to the horizontal slide 14, and the position of the work table 11 is switched by the expansion / contraction operation. The extension operation of the air cylinder 15 moves to the workpiece receiving position at the front of the machine, and the contraction action moves to the measurement position at the rear of the machine.

Next, FIGS. 2 to 4 are a side view, a front view, and a plan view showing the workpiece inspection device 7. The workpiece 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 respectively downward. The two measuring heads 22 are attached to the slide mechanism via different brackets 23, respectively, and have a structure capable of independent movement in the left-right width direction.

As shown in FIG. 2, a support block 25 standing 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 adjustment slides 27 are slidably attached to the guide rail 26. The adjustment slide 27 is a guide block that constitutes a guide rail 26 and a bearing slide. Therefore, the workpiece inspection apparatus 7 can change and adjust the distance between the pair of contactors 21 without changing the vertical posture by moving the pair of adjustment slides 27 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 workpiece W is measured by the pair of contacts 21. 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 workpiece inspection device 7, and the tip of the contact 21 abuts against the inner surface of the workpiece W as shown in the figure. The displacement amount from the position is configured to be detected.

For example, the measuring head 22 has a movable part in which a pair of contacts 21 are swung outward (in a direction away) by a spring inside the main body. 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 supplying and exhausting compressed air, and measurement for the contact 21 is performed by air pressure control. Further, the measuring head 22 is provided with a detection sensor for detecting the displacement amount of the contact 21, and is configured to transmit a detection signal to the arithmetic processing unit of the inspection machine 1 that executes the inspection processing of the workpiece. Yes.

The workpiece inspection device 7 adjusts the reference position at the time of measurement for the assembled measurement head 22. For the adjustment of the reference position, a setting is performed in which the master work is set on the work table 11 and the position where the tip of the contact 21 is applied to the inner surface thereof is set as the reference position. As described in the above-mentioned problem, the accuracy of measuring a tolerance of about 0.5 mm is high, and the alignment of the measuring head 22 is a difficult task. Therefore, since the conventional workpiece inspection device has a structure in which the measurement head is replaced, fine adjustment is difficult. In addition, the handling of the signal line connected to the detection sensor and the air pipe for operating the contactor is a laborious operation.

In this respect, in this embodiment, the measurement head 22 is mounted on the adjustment slide 27 in order to eliminate such removal. That is, even if the size of the workpiece W to be processed changes, the pair of measuring heads 22 can be used as they are by changing and adjusting the reference position. Furthermore, in order to facilitate the adjustment of the reference position described above, a configuration is adopted in which an adjustment spacer 28 is sandwiched between the brackets 23. The adjustment 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 state in which the pair of adjustment slides 27 sandwich the adjustment spacer 28. At that time, in order to improve accuracy, the pair of adjustment slides 27 are positioned so as to press each other. Since the position is shifted only by sandwiching the adjustment spacer 28 between the pair of adjustment slides 27, a positioning mechanism for stopping the movement of the adjustment slide 27 is provided. However, since the adjustment slide 27 is a guide block that constitutes a bearing slide, it is not preferable to apply a strong force for restricting movement.

Therefore, in the workpiece inspection device 7 of the present embodiment, the adjustment spacer 28 is sandwiched between the brackets 23, and a positioning mechanism that restricts movement with respect to 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 the attachment position of the adjustment spacer 28 and is disposed above the pair of left and right brackets 23 as shown in FIG.

The bracket 23 is arranged so that a plate-like vertical block 231 that is screwed to the adjustment slide 27 and a plate-like horizontal block 232 to which the measurement head 22 is attached are joined in an L shape and are orthogonal to both. The support plate 233 is joined. A long hole 235 is formed in the horizontal block 232 in the longitudinal direction of the machine body, and the measuring head 22 is fixed to the lower side by a bolt 33 that passes through the long hole 235. The measuring head 22 of the present embodiment includes the contact 21 that measures the inner diameter of the workpiece W. However, the workpiece inspection device 7 includes a contact corresponding to the outer diameter measurement of the workpiece W and the like. It is also possible to replace the measuring head.

The long plate 312 that is long in the left-right width direction is formed in the stopper plate 31. The long holes 312 are formed corresponding to the movement range of the measuring head 22, and a pair of lever clamps 32 each having a threaded portion 321 passing through the long holes 312 are provided on the top of the stop plate 31. Yes. The screw portion 321 of the lever clamp 32 that penetrates the long hole 312 is screwed into the female screw portion formed in the vertical block 231 of the bracket 23.

In the lever clamp 32, serrations are formed in the threaded portion 321. Normally, the rotation of the lever portion is transmitted to the threaded portion 321 by meshing of the groove. The rotation is not transmitted. In the positioning mechanism, when the screw portion 321 is rotated 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 supporting stop plate 31 is pressed downward to bend. ing. The stop plate 31 is pressed against the upper surface of the vertical block 231 by bending because there is only a slight gap of about 0.4 mm between the stop plate 31 and the vertical block 231 in a normal horizontal posture. Therefore, the movement of the adjustment slide 27 is limited by the frictional resistance between the pressing plate 31 and the vertical block 231 pressed against each other.

Next, FIG. 7 is a diagram showing a part of the positioning mechanism, and shows three types of examples A, B, and C having different workpiece W sizes. The adjustment spacers 28 (28a, 28b, 28c) made according to the respective sizes are exchanged as necessary. Each of the adjustment spacers 28 is formed with a main body portion 281 that is sandwiched by a pair of brackets 23 (vertical blocks 231) from both the left and right sides, and a grip portion 282 in which a tidy catching hole is opened. A gourd-shaped positioning hole 283 is formed in the main body portion 281. On the other hand, a positioning bolt 34 screwed at the tip is attached to the guide rail 26 at the position shown in FIG. The adjustment spacer 28 is attached so that the head portion of the bolt 34 passes through the positioning hole 283.

Subsequently, according to the inspection machine 1 configured as described above, the processed workpiece W is transferred from the machine tool by the automatic workpiece transfer machine. At that time, the work table 11 on the horizontal slide 14 is at the work receiving position in the front of the machine body by the extension operation of the air cylinder 15, and the processed work W is transferred to the work table 11 there. Thereafter, the air cylinder 15 is contracted to move the workpiece W to the inspection position shown in FIG. Next, the workpiece inspection device 7 is moved from the raised retreat position to the lowered detection position shown in FIG. At this time, the displacement amount when the contact at the lower end of the contact-type displacement measuring head 29 extending downward hits the upper surface of the workpiece W is detected, and the thickness of the workpiece W is calculated.

As shown in FIGS. 5 and 6, the workpiece inspection device 7 moved to the inspection position can be measured by inserting a pair of contacts 21 into the workpiece W (W1, W2). The measuring head 22 at the time of insertion receives a force from a piston operated by compressed air, swings in a direction in which the pair of contacts 21 approach, and is inserted into the work W in a closed state. Then, after insertion, the compressed air is released to swing the pair of contacts 21 in a direction away from each other by a spring force, and the leading end is applied to the inner surface of the work as shown. The position of the contactor 21 at this time is detected by a detection sensor in the measuring head 22, and the detection signal is sent to the arithmetic processing unit of the detector 1 to calculate the inner diameters of the workpieces W1 and W2 and the machining dimensions. Inspection is performed.

In the measurement by the workpiece inspection device 7, the contact 21 swings and contacts the workpiece W. However, 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 workpiece W. become. For example, when a change from the workpiece W1 to the workpiece W2 is necessary, the adjustment adjustment of the attachment 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 rotated in the direction in which the screw portion 321 is loosened. Then, the cantilever support stop plate 31 released from the load returns to a horizontal state and is in a non-contact state away from the vertical block 231.

Therefore, the pair of adjustment slides 27 moves along the guide rail 26 in the left and right direction, the adjustment spacer 28a is removed, and the adjustment spacer 28c is attached instead. At this time, the screw portion 321 of the lever clamp 32 moves in the elongated hole 312, and the adjustment slide 27, the bracket 23, and the measurement head 22 move together. Thereafter, the pair of adjustment slides 27 are brought close to each other, and the adjustment spacers 28 c are sandwiched between the vertical blocks 231. The lever clamp 32 is rotated in the direction in which the screw portion 321 is tightened in a state where the adjustment spacer 28 c is pressed from both sides by the vertical block 231. By tightening the lever clamp 32, the cantilever supporting stop plate 31 is bent and pressed against the vertical block 231, and the movement of the adjusting slide 27 is limited by the frictional resistance.

Therefore, in this embodiment, the adjustment adjustment of the attachment position of the measurement head 22 does not require the measurement head 22 to be removed, so that it is not necessary to remove a signal line or an air pipe connected to the measurement head 22, and the work load of the setup change Is greatly reduced. Further, since no tools are used for the setup change, the work is easy and the time can be shortened. In addition, since the measurement head 22 is not attached or detached, it is possible to avoid the occurrence of a malfunction due to the contact 21 being brought into contact with something at the time of replacement as in the prior art. The adjustment spacer 28 can be easily attached to a predetermined position by inserting the positioning bolt 34 into the gourd-type positioning hole 283.

According to the workpiece inspection device 7 of the present embodiment, the interval between the pair of contacts 21 is uniquely determined by the adjustment spacer 28 used. Therefore, even if extremely fine adjustment is required as described above, the change adjustment of the measurement head 22 can be performed accurately and easily. However, the lever clamp 32 needs to be tightened in a state where the adjustment spacer 28 is correctly sandwiched between the pair of vertical blocks 231. In this respect, since the movement of the adjustment slide 27 is limited by the frictional resistance when the stopper plate 31 is slightly bent, the screw portion 321 of the lever clamp 32 is not strongly tightened, and a shift that occurs at the time of tightening. Can be suppressed.

In addition, the workpiece inspection device 7 that does not use a tool can also perform sandwiching by a pair of vertical blocks 231 while an operator holds the support plates 233 with respect to both brackets 23 while holding them. Therefore, the positioning can be performed correctly so that there is no gap between the vertical block 231 and the adjustment spacer 28. 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 the measurement may not be obtained.

In view of this, one of the screw portions 321 constituting the pair of lever clamps 32 is a right-hand thread and the other is a left-hand thread, so that the movement of the vertical block 231 due to the backlash becomes the adjustment spacer 28 side when tightened. To. Therefore, by performing the tightening operation of 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.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to these, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the lever clamp 32 using screw tightening is used as a configuration in which the cantilever-supporting stop plate 31 is pressed against the vertical block 231. However, a lever is used instead of the lever clamp 32. A cam lever may be used.
Further, for example, the workpiece inspection device 7 according to the embodiment is configured such that the operator manually moves the adjustment slide 27 and tightens the screw portion 321. These movements are performed using a servo motor or the like. You may make it automate.

DESCRIPTION OF SYMBOLS 1 ... Inspection machine 7 ... Work inspection device 21 ... Contact 22 ... Measuring 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

A pair of measuring heads equipped with contacts for measuring the distance between two points by contact with the object;
Two adjusting slides each integrally provided with the pair of measuring heads;
A guide rail in which the two adjusting slides are movably assembled;
A spacer member having a size according to a measurement dimension performed by the pair of contacts;
A workpiece inspection apparatus having a positioning mechanism for stopping movement of the two adjustment slides sandwiching the spacer member.
2. The workpiece inspection apparatus according to claim 1, wherein the positioning mechanism regulates the movement of the adjustment slide by a frictional force by operating a tightening lever.
The positioning mechanism is formed with a long hole, and is attached to the two adjustment slides with a stop plate that is cantilevered above the adjustment slide and with a slight gap from the stop plate. The workpiece inspection device according to claim 2, further comprising: an indirect block; and two lever clamps in which screw portions that pass through the elongated holes from above the stop plate are respectively screwed into the indirect block.
4. The workpiece inspection device according to claim 3, wherein one of the two lever clamps is a right-hand thread and the other is a left-hand thread.
The workpiece inspection according to any one of claims 1 to 4, wherein an attachment structure is provided between the spacer member and the guide rail side member to dispose the spacer member at a predetermined position of the guide rail. apparatus.