JP2017024090A - Seating state determination condition adjustment tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seating state determination condition adjustment tool capable of easily adjusting a determination condition for confirming a seating state of a work.SOLUTION: A seating state determination condition adjustment tool 1 is installed in a chuck 8 for confirming a seating state of a work based on a leakage quantity of gas C from a clearance between an abutting surface 830 and the work seated on the abutting surface 830, for adjusting a determination condition of the seating state. The seating state determination condition adjustment tool 1 is provided with a tool body 2 for securing a leak clearance A of leaking out the gas C and a clearance width adjustment member 3 capable of adjusting a clearance width B of the leak clearance A, between the abutting surface 830 for opening a discharge port 830a of the gas C and itself.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a jig for adjusting a seating state determination condition for adjusting a determination condition for checking a seating state of a workpiece with respect to a chuck of a machine tool.

  Patent Document 1 discloses a chuck condition detection device that detects a contact state of a workpiece with respect to the gold based on an amount of air leakage from a gap between the contact surface of the gold and the workpiece. The larger the gap between the contact surface of the gold and the workpiece, the greater the amount of air leakage. According to the chuck status detection device described in the document, the seating state of the workpiece on the contact surface can be confirmed based on a predetermined determination condition regarding the leakage amount (determination condition for checking the seating state of the workpiece with respect to the chuck).

Japanese Utility Model Publication No. 4-112712

  However, the amount of air leakage from the gap between the contact surface and the work varies depending not only on the seating state of the work on the contact surface but also on the roughness of the seating surface of the work with respect to the contact surface. For example, when the seating surface of the workpiece is a material surface such as a black skin surface, the workpiece seating surface becomes rough. For this reason, the amount of air leakage increases. Therefore, it is necessary to adjust the determination condition for checking the seating state of the workpiece according to the roughness of the seating surface of the workpiece.

  Therefore, an object of the present invention is to provide a jig for adjusting a seating condition determination condition capable of easily adjusting a determination condition for checking a seating state of a workpiece with respect to a chuck.

  In order to solve the above problems, the seating condition determination condition adjusting jig of the present invention determines the seating state of the workpiece based on the amount of gas leakage from the gap between the abutting surface and the workpiece seated on the abutting surface. In order to adjust the determination condition of the seating state on the chuck to be confirmed, a jig for adjusting the seating state determination condition, the gap between the contact surface where the gas discharge port is opened, A jig main body that secures a leak gap through which gas leaks and a gap width adjusting member that can adjust the gap width of the leak gap are provided.

  The jig for adjusting the seating state determination condition according to the present invention is attached to the chuck in order to adjust the determination condition for checking the seating state of the workpiece with respect to the chuck. The leak gap is ensured between the contact surface of the chuck and the jig body. The leak gap corresponds to the gap between the contact surface of the chuck and the workpiece when the workpiece is attached to the chuck.

  According to the jig for adjusting the seating condition determination condition of the present invention, the gap width of the leak gap can be easily adjusted according to the roughness of the seating surface of the workpiece. In addition, the determination condition for confirming the seating state of the workpiece with respect to the chuck can be easily adjusted.

1 is a cross-sectional view in the left-right direction of a chuck to which a jig for adjusting a seating condition determination condition, which is an embodiment of a jig for adjusting a sitting condition determination condition of the present invention, is attached. It is a right view of the chuck. It is an enlarged view in the circle III of FIG. FIG. 4 is an enlarged view in a circle IV in FIG. 2.

  Hereinafter, embodiments of the jig for adjusting the seating condition determination condition of the present invention will be described. FIG. 1 is a cross-sectional view in the left-right direction of a chuck to which a jig for adjusting a seating condition determination condition according to this embodiment is attached. FIG. 2 shows a right side view of the chuck. FIG. 3 shows an enlarged view in a circle III in FIG. FIG. 4 shows an enlarged view in a circle IV in FIG. 1 corresponds to a cross section taken along the line II in FIG.

<Chuck>
First, the structure of a chuck to which a seating condition determination condition adjusting jig (hereinafter abbreviated as “jig”) according to the present embodiment is attached will be described. As shown in FIGS. 1 to 4, the chuck 8 is attached to a main shaft (not shown) of a lathe 9. The extending direction of the main shaft (main shaft direction) is the left-right direction. The lathe 9 includes a control device 90, a gas supply device 91, a gas passage 93, a regulator 94, a pressure switch 95, and a chuck 8.

  The chuck 8 is a ball lock chuck. As shown in FIG. 1, the chuck 8 includes a chuck body 80, three claw members 81, a pedestal 82, and an abutment 83. As shown in FIG. 2, the chuck body 80 has a disk shape. The three claw members 81 are arranged on the right surface of the chuck body 80 so as to be spaced apart from each other by a central angle of the chuck body 80 of 120 °. The claw member 81 includes a claw body 810 and a claw 811. As indicated by white arrows in FIG. 1, the claw body 810 can swing in the radial direction of the chuck body 80 around the ball portion 810a. The claw 811 is attached to the claw body 810.

  As shown in FIG. 1, the pedestal 82 is disposed on the right surface of the chuck body 80. The money 83 is arranged on the right surface of the pedestal 82. As shown in FIG. 3, three contact surfaces 830 are disposed on the right end surface of the abutment 83. As shown in FIG. 2, the three abutting surfaces 830 are arranged so as to be separated from each other by a central angle of 120 ° of the chuck body 80. The contact surface 830 is disposed on the radially inner side of the gripping surface 811 a of the claw 811. The contact surface 830 is a smooth surface developed in the vertical direction. As shown in FIGS. 3 and 4, a discharge port 830 a is formed in the contact surface 830.

  As shown in FIG. 1, the gas passage 93 connects the gas supply device 91 and the three discharge ports 830a. The pressure switch 95 is disposed at the trunk portion of the gas passage 93 (the portion on the upstream side of the branch portion 930 leading to the three discharge ports 830a). The pressure switch 95 outputs an ON signal when the pressure becomes equal to or higher than a predetermined set pressure. The regulator 94 is disposed at a portion upstream of the pressure switch 95 in the trunk portion of the gas passage 93. The operator can adjust the pressure of air from the gas supply device 91 by operating the regulator 94. Air is included in the “gas” concept of the present invention. The control device 90 is electrically connected to the gas supply device 91.

  Note that the air supply pressure from the gas supply device 91 is adjusted by a regulator to a pressure at which the pressure switch 95 is turned off when the workpiece is not seated on the chuck. The pressure and the set pressure of the pressure switch 95 are determination conditions for checking the seating state of the workpiece with respect to the chuck (hereinafter referred to as “determination conditions”).

<Jig>
Next, the configuration of the jig of this embodiment will be described. When performing a determination condition adjusting method described later, the jig 1 is attached to the chuck 8 instead of a workpiece (not shown). As shown in FIGS. 1 to 4, the jig 1 includes a jig body 2, two main screws 3, and two auxiliary screws 4.

  As shown in FIGS. 1 and 2, the jig body 2 has a cylindrical shape extending in the left-right direction. The jig body 2 includes a seating surface 20, two groove portions 21, two main screw holes 22, and two sub screw holes 23. As shown in FIG. 3, the seating surface 20 is disposed on the left end surface of the jig body 2. The seating surface 20 is a smooth surface developed in the vertical direction. The seating surface 20 has a ring shape.

  As shown in FIG. 2, the two groove portions 21 are disposed with a central angle of the jig main body 2 separated by 180 °. As shown in FIG. 3, the groove 21 is recessed in the seating surface 20. The groove portion 21 penetrates the jig body 2 in the radial direction. The two main screw holes 22 each penetrate the jig body 2 in the left-right direction. The left end of the main screw hole 22 opens to the groove bottom 210 of the groove portion 21. The two auxiliary screw holes 23 respectively penetrate between the outer peripheral surface of the jig body 2 and the main screw hole 22 in the radial direction. The inner end of the auxiliary screw hole 23 in the radial direction opens at an intermediate portion of the main screw hole 22.

  The two main screws 3 are respectively inserted into the main screw holes 22. The screw portion of the main screw 3 and the screw portion of the main screw hole 22 are screwed together. The main screw 3 can be screwed with a hexagon wrench W. For this reason, the main screw 3 can protrude from the groove bottom 210 to the left side. The two sub screws 4 are respectively inserted into the sub screw holes 23. The screw portion of the sub screw 4 and the screw portion of the sub screw hole 23 are screwed together. The sub screw 4 can be screwed with a hexagon wrench (not shown). For this reason, the sub screw 4 can lock the main screw 3.

<Checking the seating state of the workpiece>
Next, a method for confirming the seating state of the workpiece with respect to the chuck 8 will be described. The seating state confirmation method is executed before workpiece processing. The seating state confirmation method is executed in a state where the workpiece is attached to the chuck 8 (a state where the three discharge ports 830a of the contact surface 830 are sealed to the seating surface of the workpiece). The control device 90 drives the gas supply device 91 to supply air to the three discharge ports 830a.

  When the seating state of the workpiece is poor, the gap between the contact surface 830 and the seating surface of the workpiece is increased. For this reason, the amount of air leakage from the gap increases, and the pressure of the air in the gas passage 93 decreases. When the pressure falls below a predetermined pressure (set pressure of the pressure switch 95, that is, a determination condition), the pressure switch 95 is turned off. Since the pressure switch 95 is turned off, the operator confirms that the seating state of the workpiece is defective.

<Judgment condition adjustment method>
Next, a determination condition adjustment method using the jig of this embodiment will be described. The determination condition adjustment method is executed, for example, immediately after the setup change. That is, when the type of workpiece is changed, the roughness of the workpiece seating surface with respect to the contact surface 830 changes. When the roughness of the seating surface changes, the size of the gap between the contact surface 830 and the seating surface changes. Therefore, if the workpiece seating state confirmation method is executed without adjusting the pressure value (determination condition) set in the regulator 94, the pressure switch 95 is actually used even though the seating state is good. May be switched off, and the operator may erroneously determine that the seating state is bad. On the other hand, although the seating state is actually poor, the pressure switch 95 remains on, and the operator may erroneously determine that the seating state is good.

  Therefore, immediately after the setup change, that is, before the first product of the same type of workpiece is processed, the determination condition is adjusted according to the roughness of the seating surface of the workpiece by executing the following determination condition adjustment method. There is a need. The determination condition adjustment method includes a protrusion amount setting step, a first pressure adjustment step, and a second pressure adjustment step.

  In the protrusion amount setting step, the protrusion amount of the main screw 3 from the groove bottom 210 is set in each of the upper and lower groove portions 21 shown in FIG. Specifically, first, the operator adjusts the amount of protrusion of the main screw 3 from the groove bottom 210 by screwing the main screw 3 with the hexagon wrench W. Next, the operator locks the main screw 3 by screwing the auxiliary screw 4 with a hexagon wrench.

  Here, the protrusion amount of the main screw 3 from the groove bottom 210 of the upper groove portion 21 shown in FIG. 2 (gap width B of the leak gap A shown in FIG. 3) simulates the case where the seating posture of the workpiece is good. Is set. On the other hand, the protrusion amount of the main screw 3 from the groove bottom 210 of the lower groove portion 21 shown in FIG. 2 (gap width B of the leak gap A shown in FIG. 3) is when the seating posture of the workpiece is poor. It is set to imitate. The gap between the contact surface 830 and the workpiece seating surface shown in FIG. 3 becomes larger when the workpiece seating posture is poorer than when the workpiece seating posture is good. For this reason, the protrusion amount of the main screw 3 of the lower groove portion 21 simulating a poor seating posture is set smaller than the protrusion amount of the main screw 3 of the upper groove portion 21 simulating good seating posture. That is, the gap width B of the lower groove portion 21 is set larger than the gap width B of the upper groove portion 21. Note that when the workpiece seating surface is rough, the gap width B is set larger than when the workpiece seating surface is smooth.

  In the first pressure adjustment step, first, the operator attaches the jig 1 to the chuck 8. The outer peripheral surface of the jig 1 is gripped from the radially outer side by the gripping surfaces 811 a of the three claws 811. In addition, the seating surface 20 of the jig 1 is supported from the left side by the three contact surfaces 830. At this time, as shown in FIG. 3, one of the three discharge ports 830a (upper discharge port 830a shown in FIG. 2) and one of the two groove portions 21 (shown in FIG. 2). Alignment with the upper groove 21) is performed. That is, the upper groove portion 21 covers a portion of the contact surface 830 where the discharge port 830a is opened. As shown in FIG. 3, a leak gap A is secured in the groove of the groove portion 21 by the alignment. The discharge port 830a and the left end surface of the main screw 3 face each other in the left-right direction. Of the three discharge ports 830a, the remaining two discharge ports 830a are sealed by the seating surface 20 (the portion where the groove 21 is not disposed).

  Subsequently, the control device 90 shown in FIG. 1 drives the gas supply device 91 in response to a command input from the operator. The gas supply device 91 supplies air C to the discharge port 830a through the gas passage 93. As shown in FIG. 3, the air C flows from the discharge port 830 a into the leak gap A, divides the inside of the leak gap A inward and outward in the radial direction, and flows out from the leak gap A.

  Here, the upper groove portion 21 shown in FIG. 2 simulates a case where the seating posture of the workpiece is good. For this reason, the pressure switch 95 must originally be kept on. If the pressure of the air from the gas passage 93 is large, the pressure switch 95 is kept on. In this case, the setting of the air pressure is good. On the other hand, when the pressure of the air from the gas passage 93 is small, the pressure switch 95 is switched off. In this case, the operator operates the regulator 94 to increase the air pressure so that the pressure switch 95 is kept on.

  The difference between the second pressure adjustment process and the first pressure adjustment process is that the jig 1 is rotated by 180 ° and attached to the chuck 8. That is, the lower groove portion 21 shown in FIG. 2 covers the upper discharge port 830a among the three discharge ports 830a.

  Also in this step, the control device 90 shown in FIG. 1 drives the gas supply device 91 in response to a command input from the operator. The gas supply device 91 supplies air C to the discharge port 830a through the gas passage 93.

  Here, the lower groove portion 21 shown in FIG. 2 simulates the case where the seating posture of the workpiece is poor. For this reason, the pressure switch 95 must originally be switched off. If the pressure of the air from the gas passage 93 is small, the pressure switch 95 is switched off. In this case, the setting of the air pressure is good. On the other hand, when the pressure of the air from the gas passage 93 is large, the pressure switch 95 is kept on. In this case, the operator operates the regulator 94 to reduce the air pressure so that the pressure switch 95 is switched off.

  As described above, by executing the first pressure adjustment step and the second pressure adjustment step, the pressure switch 95 is turned on in the upper groove portion 21 shown in FIG. 2, and the lower groove portion 21 shown in FIG. An air pressure value, that is, a determination condition is set in the regulator 94 so that the pressure switch 95 is turned off.

<Effect>
Next, the effect of the jig of this embodiment will be described. Temporarily, when using the jig | tool (jig 1 which does not have the main screw 3) with which gap width B was fixed, gap width B (namely, groove depth) with respect to several types of workpiece | work with which the roughness of a seating surface differs. It is necessary to prepare a plurality of jigs having different sizes. Alternatively, in order to change the groove depth, it is necessary to cut the groove bottom 210 or to arrange a floor plate on the groove bottom 210.

  In this respect, the jig 1 of the present embodiment includes a main screw 3. For this reason, by adjusting the amount of protrusion of the main screw 3 from the groove bottom 210, the gap width B of the leak gap A and the cross-sectional area of the leak gap A (cuts in the direction perpendicular to the extending direction of the groove portion 21). The area, that is, the air passage cross-sectional area can be easily adjusted. Therefore, the single jig 1 can be shared for a plurality of types of workpieces having different seating surface roughnesses. Further, according to the jig 1 of the present embodiment, the gap width B of the leak gap A can be easily adjusted according to the roughness of the workpiece seating surface. In addition, the determination condition can be easily adjusted.

  The main screw 3 is screwed into the main screw hole 22. That is, the main screw 3 is moved in the left-right direction by the screwing mechanism. For this reason, the amount of protrusion of the main screw 3 from the groove bottom 210 (that is, the gap width B) can be easily finely adjusted. Further, the secondary screw 4 can contact the outer peripheral surface of the main screw 3. For this reason, the main screw 3 (specifically, the protruding amount of the main screw 3 from the groove bottom 210) can be easily locked.

  The main screw 3 is screwed into the main screw hole 22, and the sub screw 4 is screwed into the sub screw hole 23. For this reason, it is difficult for the main screw 3 to drop off from the main screw hole 22 and the auxiliary screw 4 from the auxiliary screw hole 23, respectively. Therefore, the jig 1 can be handled (for example, carried and stored) with the main screw 3 and the auxiliary screw 4 mounted on the jig body 2.

  In addition, one of the three discharge ports 830 a is accommodated in one of the two groove portions 21. The remaining two discharge ports 830a are sealed by the seating surface 20 (the portion where the groove 21 is not disposed). For this reason, it is possible to prevent the air C from leaking from a portion other than the leak gap A when detecting the leakage amount of the air C.

  Further, the left end surface of the main screw 3 and the discharge port 830a face each other in the left-right direction. That is, the left end surface of the main screw 3 is disposed at the upstream end of the leak gap A. For this reason, the entire amount of the air C that divides the inside of the leak gap A radially inward and outward can pass through the gap width B.

<Others>
The embodiment of the jig of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  The groove 21 does not have to be provided in the seating surface 20. For example, the leak gap A may be secured between the seating surface 20 and the contact surface 830 by bringing the left end surface of the main screw 3 protruding from the seating surface 20 into contact with the contact surface 830.

  The type of the gas supply device 91 is not particularly limited. For example, a compressor or a pump may be used. The type of data relating to the amount of gas leakage (in this embodiment, the gas pressure) is not particularly limited. For example, it may be a gas flow rate.

  The type of the pressure switch 95 is not particularly limited. The pressure switch 95 may be a type that outputs an ON signal when the pressure is lower than a predetermined pressure. In this case, the pressure value of the air is supplied to the regulator 94 so that the pressure switch 95 is turned off in the upper groove portion 21 shown in FIG. 2 and the pressure switch 95 is turned on in the lower groove portion 21 shown in FIG. That is, the determination condition may be set.

  The type of gas (air C in this embodiment) supplied from the gas supply device 91 is not particularly limited. For example, nitrogen may be used. The protruding position of the main screw 3 with respect to the groove portion 21 (in this embodiment, the groove bottom 210) is not particularly limited. For example, it may be a groove side surface. In this case, the groove width corresponds to the “gap width” of the present invention.

  The kind of gap width adjusting member (main screw 3 in this embodiment) is not particularly limited. For example, a bolt may be used. Further, instead of the main screw hole 22, a pin that can be inserted stepwise into a hole formed in the jig body 2 at a predetermined pitch may be used. It is sufficient that the gap width B of the leak gap A can be adjusted.

  The number (three in the present embodiment) of the contact surfaces 830 of the claw member 81 and the abutment 83 is not particularly limited. For example, there may be four, five, six, etc. The type of the chuck 8 (ball lock chuck in this embodiment) is not particularly limited. For example, a pin arbor chuck, an inner diameter collet chuck, an outer diameter collet chuck, a magnet chuck, and the like may be used.

  The timing for executing the determination condition adjusting method (immediately after the setup change in this embodiment) is not particularly limited. For example, when the control device 90 has a high frequency of erroneously determining the seating state of the workpiece, the workpiece may be interrupted and executed. The first pressure adjustment step and the second pressure adjustment step may be repeatedly performed as many times as desired. The execution order of the first pressure adjustment step and the second pressure adjustment step (in the present embodiment, the first pressure adjustment step → the second pressure adjustment step) may be reversed.

  The extending direction of the main shaft of the lathe 9 (the left-right direction in this embodiment) is not particularly limited. It may be a front-rear direction, a vertical direction, or the like. The type of the machine tool provided with the chuck 8 (the lathe 9 in this embodiment) is not particularly limited. For example, a horizontal lathe, a front lathe, a vertical lathe, a single-axis lathe, a twin-axis lathe, a milling machine, a drilling machine, a milling cell, a turning center, a machining center, and the like may be used.

  1: Jig for adjusting seating condition determination condition 2: Jig body 20: Seating surface 21: Groove portion 210: Groove bottom 22: Main screw hole 23: Sub screw hole 3: Main screw 4: Sub screw 8: Chuck 80: Chuck Main body 81: Claw member 810: Claw main body 810a: Ball portion 811: Claw 811a: Holding surface 82: Base 83: Gold 830: Contact surface 830a: Discharge port 9: Lathe 90: Control device 91: Gas supply device 93: Gas passage 930: Branch part 94: Regulator 95: Pressure switch A: Leakage gap B: Gap width C: Air (gas) W: Hexagon wrench

Claims (5)

A seat that is attached to a chuck that checks the seating state of the workpiece based on the amount of gas leakage from the gap between the abutting surface and the workpiece seated on the abutting surface in order to adjust the determination condition of the seating state A jig for adjusting the condition judgment condition,
A jig body that secures a leak gap through which the gas leaks between the contact surface where the gas discharge port is opened, and
A gap width adjusting member capable of adjusting the gap width of the leak gap;
A jig for adjusting a seating state determination condition, comprising: The jig body includes a seating surface that is seated on the contact surface, and a groove that is recessed in the seating surface, faces the contact surface, and passes the gas discharged from the discharge port. And
The seating state determination condition adjusting jig according to claim 1, wherein the gap width adjusting member protrudes from a groove bottom of the groove portion and can adjust the gap width by adjusting a protruding amount. The jig body has a main screw hole communicating with the groove bottom,
The seating state determination condition adjusting jig according to claim 2, wherein the gap width adjusting member is a main screw that is screwed into the main screw hole. The jig body has a sub screw hole communicating with the inner peripheral surface of the main screw hole,
The seating condition determination condition adjusting jig according to claim 3, further comprising a sub screw that is screwed into the sub screw hole and is capable of contacting an outer peripheral surface of the main screw. The chuck has a plurality of the discharge ports,
A plurality of the groove portions are provided in the seating surface,
Among the plurality of discharge ports, any one of the discharge ports is accommodated in a groove of any one of the plurality of groove portions,
The seating condition determination condition adjusting jig according to any one of claims 2 to 4, wherein, among the plurality of discharge ports, the remaining discharge ports are sealed by the seating surface.

Images