JP5086151B2 - Work detection device, work detection method, and machine tool including work detection device - Google Patents

Description

  The present invention relates to a workpiece detection device and workpiece detection method for detecting a workpiece by relative movement with the workpiece, and a machine tool including the workpiece detection device.

In this type of detection device, for example, the workpiece is caused by a change in air pressure before and after the end surface of an inspection device in which an air ejection hole is formed is brought into contact with the workpiece and the air ejection hole is closed by the workpiece. A device for inspecting whether or not the device is normally positioned at a predetermined position is known (for example, see Patent Documents 1 and 2).
Japanese Utility Model Publication No. 6-24849 JP 2003-19642 A

  By the way, foreign matter such as cutting dust may adhere to the surface of the workpiece to be detected, and if these foreign matter enters the inside of the air ejection hole and becomes clogged, the position inspection of the workpiece will be performed normally. There is a problem that it can not be done. Therefore, when the foreign matter is clogged in the air ejection hole, it is necessary to remove the foreign matter from the air ejection hole.

  However, the conventional detection device as described in the above-mentioned patent document does not have a structure that can easily take out the foreign matter clogged in the air ejection hole, and removal of the foreign matter is not only a great burden on the operator. It also causes the productivity to decrease.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a workpiece detection device and a workpiece detection method in which foreign matter removal is easy, and a machine tool including the workpiece detection device.

  In order to achieve the first object described above, the present invention provides an air ejection hole in an apparatus main body arranged opposite to a workpiece, and the air ejection hole is formed by relative movement between the apparatus main body and the workpiece. The apparatus is disposed in the apparatus main body so as to be closed by the work abutting on the apparatus main body, and the apparatus is based on a change in air pressure in the air ejection hole due to relative movement between the work and the apparatus main body. In a workpiece detection device that detects contact of a workpiece with a main body, a concave groove is formed on the outer peripheral surface of the main body, the air ejection hole is communicated with the concave groove, and the concave groove is closed from the outer peripheral side. A seal member is detachably attached to the outer peripheral surface of the apparatus main body, and air is ejected from the air ejection holes by supplying compressed air into the closed concave groove.

Here, in this specification, “relative movement between the apparatus main body and the workpiece” means that the apparatus main body moves when the work is fixed, the apparatus main body is fixed, and the apparatus main body and the work move. This is a concept including the case where both of the workpieces move.
Since the present invention is configured as described above, when the work is brought into contact with the apparatus main body by the relative movement between the apparatus main body and the work, the air ejection hole is closed by the work, and the air pressure increases accordingly. Thus, it is possible to detect contact between the workpiece and the apparatus main body. For example, if there is a gap between the workpiece and the device main body, the amount of increase in air pressure is smaller than when the device main body and the workpiece are in contact. From this result, the workpiece and the device main body are in contact. It can be judged that there is not. The contact detection result of the workpiece can be used to determine various states of the workpiece such as the presence or absence of the workpiece and whether the positioning is normal. In a state where the apparatus main body and the workpiece do not move relative to each other, the air pressure becomes larger than a predetermined value, so that it is possible to detect clogging of foreign matter such as cutting dust in the air ejection hole.

  However, in the present invention, even if foreign matter such as cutting dust enters the air ejection hole, this foreign matter can be easily removed by using the concave groove formed on the outer peripheral surface of the apparatus main body. The concave groove can be easily removed by removing the sealing member attached to the outside of the apparatus main body, so that it is not necessary to remove the entire apparatus from the work processing machine, and the work can be completed in a short time. The impact on productivity is small.

In the present invention, the apparatus main body is provided with a gauge member that engages with the concavo-convex portion of the workpiece, and the air ejection hole is closed by the workpiece when the gauge member engages with the concavo-convex portion. An arrangement may be adopted.
If comprised in this way, it can test | inspect not only the detection of a workpiece | work but whether the uneven | corrugated shape formed in the workpiece | work corresponds with the uneven | corrugated shape set beforehand. For example, when the apparatus main body and the workpiece move relative to each other after the workpiece is finished, if the irregular shape of the workpiece is abnormal, the gauge member and the irregular portion are not engaged, and the air ejection hole is Since the workpiece is not closed, the contact between the workpiece and the apparatus main body is not detected, and the quality of the uneven shape of the workpiece can be determined based on this result. As described above, according to the present invention, it is possible to inspect the concavo-convex shape of a workpiece without adding a dedicated inspection step when performing continuous machining or the like of the workpiece.

The present invention can be applied to machining of various workpieces. For example, when the unevenness is a hole having a preset hole diameter and depth formed by machining the workpiece, the gauge member is arranged on the same axis as the axis of the hole, and is the same as the hole diameter. It is preferable to use a shaft body having an outer diameter of 2 mm and project the tip of the shaft body from the apparatus main body by a length corresponding to the depth of the hole.
According to this configuration, when there is a defect in a part of the tool that forms the hole, and the hole diameter is normal and there is an abnormality in a part of the hole depth, the gauge member abuts on the end of the hole, Since the apparatus main body and the workpiece do not come into contact with each other, it is possible to inspect the processing abnormality.
The gauge member is preferably position adjustable or replaceable with respect to the apparatus main body.
By doing in this way, even if it changes to what has uneven | corrugated shapes, such as a hole diameter and a hole depth, it becomes possible to respond quickly by adjusting the position of the said gauge member, or replacing | exchanging.

  Furthermore, the workpiece detection apparatus of the present invention is a workpiece processing or assembly (hereinafter referred to as “processing” in this specification), like a processing machine or an assembly machine that performs plastic processing on a workpiece. It can be applied to all kinds of devices that For example, when the device is a device having a main shaft provided with a chuck for gripping a workpiece and a moving body that can move relative to the main shaft, the apparatus main body is mounted on the moving body. The contact of the workpiece with the apparatus main body may be detected by the relative movement between the workpiece and the apparatus main body.

In the method of the present invention, an air ejection hole is provided in an apparatus main body disposed opposite to a work so as to be closed by the work abutting on the apparatus main body due to relative movement between the apparatus main body and the work, In the workpiece detection method for detecting contact of the workpiece to the device main body based on a change in air pressure in the air ejection hole due to relative movement between the device main body and the workpiece, a concave groove is formed on the outer peripheral surface. Then, an air ejection hole is communicated with the concave groove, and the apparatus body is prepared by closing the concave groove with a seal member from the outer peripheral side, and compressed air is supplied into the closed concave groove to supply the air. In this method, air is ejected from the ejection holes.
Further, a gauge member that engages with the uneven portion of the workpiece is provided in the apparatus main body, and the air ejection hole is disposed so as to be blocked by the workpiece when the gauge member engages with the uneven portion. Also good.
According to this method, since the workpiece detection and the workpiece unevenness inspection can be performed at the same time, for example, when the workpiece is continuously machined, the workpiece machining state is inspected without adding a dedicated inspection process. It becomes possible to do.

  According to the present invention, even if foreign matter such as cutting waste is clogged in the air ejection hole, the foreign matter can be easily removed. In addition, by providing a gauge member together, it is possible to determine whether or not the uneven shape formed on the workpiece is normal, for example, the occurrence of machining abnormalities caused by breakage or partial chipping of tools, It can be discovered early without removing the workpiece from equipment such as a processing machine or an assembly machine. In this way, by enabling the workpiece detection and the unevenness inspection to be performed at the same time, for example, when performing continuous machining of the workpiece, it is not necessary to add a process for inspection, and the machining efficiency of the workpiece is reduced. And processing costs are not increased.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
[First embodiment of workpiece detection apparatus]
The workpiece detection device of the present invention can be used to determine various states of the workpiece, such as the presence or absence of the workpiece and the positioning state of the workpiece. However, in the following description, it is assumed that the workpiece positioning state is mainly inspected. To do.
FIG. 1 relates to a first embodiment of the present invention in which a workpiece detection apparatus is applied to a workpiece position inspection system. FIG. 1A illustrates the overall configuration of a workpiece position inspection system including the workpiece detection apparatus of this embodiment. (B) is a cross-sectional view of the workpiece detection device of (a), (c) is a front view of the workpiece detection device of (a), and (d) is the depth of the concave groove and the hole diameter of the air ejection hole. It is the elements on larger scale explaining an example of a relationship.

  The workpiece position inspection system 1 positions the workpiece W by contacting the workpiece W, and at the same time generates a workpiece detection device 10 for inspecting whether the positioning is normally performed and compressed air with a constant pressure. An air supply source 11 such as an air pump that is supplied to the workpiece detection device 10, a pressure gauge 12 that detects the pressure of the air supplied from the air supply source 11 to the workpiece detection device 10 and outputs a pressure signal, and a workpiece The drive unit 13 that moves the detection device 10 forward and backward relative to the workpiece W, the supply and stop control of air from the air supply source 11 to the workpiece detection device 10, and the drive and stop control of the drive unit 13 are performed. And a determination unit 14 that determines whether or not the workpiece detection device 10 has normally detected the workpiece W based on the pressure signal from the pressure gauge 12.

  As shown in (b) and (c), the workpiece detection device 10 includes, for example, a main body 101 as a device main body in this embodiment that is mounted on a tool post, a tail stocker, a back spindle stock or other moving body of a machine tool. The end surface 102 formed at one end (right end in the figure) of the main body 101 and abutting in contact with the end surface Wa of the work W by the relative movement of the work detection device 10 and the work W by the drive unit 13; A plurality (three in the present embodiment) of air ejection holes 104 formed inside one end side and opened at the end face 102 and the air ejection holes 104 formed inside the main body 101 communicate with the air supply source 11. Air circulation holes 105 for sending the air supplied from the air ejection holes 104 to the air ejection holes 104. Reference numeral 110 denotes a flat surface formed by cutting out a part of the outer peripheral surface of the main body 101. For example, by pressing a fixing bolt against the flat surface 110, a turret of a machine tool as described later or the like is used. The main body 101 can be attached.

The air ejection hole 104 is formed so as to open in a region in surface contact with the end surface Wa of the workpiece W. In this embodiment, as shown in (c), the air ejection holes 104 are formed to be opened at three locations. However, the air ejection holes 104 may be opened at two locations, or four. It may be more than one place. In addition, although the opening of the air ejection hole 104 may be one place, in order to perform a workpiece | work position test | inspection normally, even if foreign materials, such as cutting waste, are stuck in one of the air ejection holes 104, it is two places. It is good to set it above, and it is more preferable to set it as three or more places. Further, in this embodiment, the three openings of the air ejection holes 104 are provided at positions that equally divide the same circumference around the axis C, but the openings are not necessarily on the same circumference. Or evenly spaced.
Further, the air ejection hole 104 positions and fixes the main body 101 held by a main spindle chuck such as an NC lathe at a predetermined rotational angle position, and in this state, the end surface 102 of the main body 101 and the outer circumferential groove 101c. Therefore, it is possible to easily communicate with the concave groove 101c by drilling with a drill. Thereby, the several air ejection hole 104 can be formed easily.

One end portion of the main body 101 is formed as a small-diameter portion 101d having a smaller outer diameter than other portions. A concave groove 101c is formed on the outer peripheral surface of the small diameter portion 101d over the entire circumference. The concave groove 101c is closed from the outer peripheral side by fitting a cylindrical seal member 108 to the small diameter portion 101d from one end side of the main body 101.
Various known means can be used as means for fixing the seal member 108 to the main body 101. For example, as shown in (b), the seal member 108 may be fixed to the main body 101 with a bolt 111. Further, as shown in FIG. 3, the inner peripheral surface of the other end of the seal member 108 is formed as a spiral hole 108a, and a spiral portion 101e that is screwed into the spiral hole 108a is formed on the outer peripheral surface of the main body 101. The sealing member 108 may be attached to the main body 101 by screwing.

  The other ends of the plurality of air ejection holes 104 and one end of the air circulation hole 105 communicate with the bottom of the concave groove 101c. The other end of the air circulation hole 105 opens to the other side of the main body 101, and is connected to the air supply source 11 via a connector 109 screwed into this opening and a pipe (not shown) connected to the connector 109. Air supplied from the air supply source 11 via the air circulation hole 105 is distributed from the concave groove 101c to each of the plurality of air ejection holes 104, and is ejected from each of the openings of the end face 102 with the same pressure. For foreign matters such as cutting chips that enter the air ejection hole 104 and are clogged therein, remove the seal member 108 from the main body 101 and insert a wire or the like from the opening side of the air ejection hole 104 or from the groove 101c side, for example. Thus, it can be pushed out from the concave groove 101 c side or the opening side of the air ejection hole 104.

  The groove depth H (see FIG. 1D) of the concave groove 101c is preferably smaller than the hole diameter D of the air ejection hole 104. By making the groove depth H of the concave groove 101c smaller than the hole diameter D, foreign matter having an outer dimension substantially equal to the hole diameter D of the air ejection hole 104 is prevented from entering the air circulation hole 105 through the concave groove 101c. In addition, by removing the sealing member 108, the foreign matter clogged at the boundary portion between the concave groove 101c and the air ejection hole 104 can be easily removed.

  The opening of the air ejection hole 104 is sealed by the end surface Wa of the workpiece W when the end surface Wa of the workpiece W and the end surface 102 of the main body 101 are brought into contact with each other by the relative movement between the workpiece detection device 10 and the workpiece W. When the air ejection hole 104 is blocked by the work W, the pressure of the air supplied from the air supply source 11 to the work detection device 10 increases. The determination unit 14 determines whether or not the pressure detected by the pressure gauge 12 exceeds a preset reference value. If it is determined that the reference value is exceeded, it is determined that the end surface Wa of the workpiece W and the end surface 102 of the main body 101 are in contact with each other, and the positioning of the workpiece W is normally performed. If the reference value is not exceeded, the end surface Wa of the workpiece W and the end surface 102 of the main body 101 do not come into contact with each other, and the air ejection hole 104 is open without being closed. It is determined that it has occurred, and the subsequent operation is prohibited, and the occurrence of an abnormality is notified by an alarm or the like. In the state where the main body 101 and the work W do not move relative to each other, the air pressure supplied from the air supply source 11 to the work detection device 10 becomes larger than a preset value, thereby entering from the air ejection hole 104. It is possible to detect clogging of foreign matters such as cutting waste. However, foreign matters such as the cutting waste can be easily removed by removing the seal member 108 from the main body 101 as described above.

[Second Embodiment of Work Detection Device]
FIG. 2 is related to 2nd embodiment of the workpiece | work detection apparatus of this invention, (a) is sectional drawing of the workpiece | work detection apparatus of this embodiment, (b) is a front view of a workpiece | work detection apparatus. In FIG. 2, the same parts and members as those of the workpiece detection apparatus of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
In this embodiment, it is assumed that a hole (unevenness) Wb having a preset hole diameter and depth is formed in the center of the end surface Wa of the workpiece W by machining. And the workpiece | work detection apparatus 10 'of this embodiment test | inspects whether the hole Wb is processed according to the dimension set beforehand.

  A through hole 101a is formed at the center of the main body 101 of the workpiece detection apparatus 10 ', and a shaft body 103 as a gauge member is inserted on the same axis C as the hole Wb of the workpiece W through the through hole 101a. Has been placed. The shaft body 103 has an outer diameter that is the same as the inner diameter of the hole Wb of the workpiece W, and is fixed to the main body 101 with its tip protruding from the end face 102 by a length equal to the effective depth of the hole Wb. . A flat surface 103 a formed by cutting out a part of the outer peripheral surface is formed in the middle portion of the shaft body 103, and the bolt 106 is inserted into the spiral hole 101 b formed so as to penetrate from the outer peripheral surface of the main body 101 to the through hole 101 a. The shaft body 103 is fixed to the main body 101 by pressing the tip of the bolt 106 against the flat surface 103a. In the second embodiment, the “device main body” of the present invention is configured including the shaft body 103 which is a gauge member fixed to the main body 101.

Further, in this embodiment, a through hole inserted into the spiral hole 101b is formed in the seal member 108, and the tip of the bolt 106b protrudes from the spiral hole 101b into the through hole to prevent the seal member 108 from rotating and coming off.
Further, as shown in the figure, by forming the scale 103b on the other end side of the shaft body 103, it becomes easy to finely adjust the protruding length of the shaft body 103 from the end face 102.

FIG. 4 shows an example in which the workpiece detection device 10 ′ of the second embodiment is attached to a machine tool such as an NC lathe. Although not particularly illustrated, the workpiece detection device 10 of the first embodiment can be attached to a machine tool such as an NC lathe in the same manner as the workpiece detection device 10 'of the second embodiment.
This machine tool has a main shaft 21 that can move forward and backward in the Z-axis direction, and a tool post 22 that can move in the X-axis direction and the Y-axis direction (direction perpendicular to the plane of FIG. 3). The tool post 22 has a plurality of tool posts 23 for holding the tool T in the Y-axis direction, and a predetermined one of the plurality of tools T mounted on the tool post 23 by the movement of the tool post 22 in the Y-axis direction. This is a comb-shaped tool post for indexing the tool T. The workpiece detection device 10 ′ is attached to one of the plurality of tool posts 23 with a bolt 24 or the like.

In this case, the drive unit 13 that moves the workpiece detection apparatus 10 'forward / backward with respect to the workpiece W is a drive unit that moves the spindle 21 forward / backward in the Z-axis direction, and determines whether the workpiece machining is normal or not. May be provided in the control device of the machine tool. The air supply source 11 (see FIG. 1) and the pressure gauge 12 may be provided outside the machine tool, but may be provided inside.
When the work detection device 10 'is provided on the machine tool, the work detection device 10' is not limited to the tool post 22 as shown in FIG. 4, and may be provided on another existing moving body such as a tailstock or a back spindle, or the work detection. A dedicated moving body for mounting the device 10 'may be provided.

Next, the operation of the workpiece detection apparatus 10 ′ of the second embodiment will be described with reference to FIG.
As shown to (a), when the hole Wb is normally formed in the end surface Wa of the workpiece | work W, the front-end | tip of the shaft body 103 which protrudes from the end surface 102 by the movement to the Z-axis direction of the main axis | shaft 21 becomes the hole Wb. The end surface Wa of the workpiece W and the end surface 102 come into contact with each other, the opening of the air ejection hole 104 is sealed by the end surface Wa, and the pressure of the air supplied from the air supply source 11 to the workpiece detection device 10 increases. . When the pressure detected by the pressure gauge 12 exceeds a preset reference value, the determination unit 14 forms the hole Wb normally, positions the workpiece W normally, and the end surface Wa of the workpiece W and the main body 101. It is determined that the end face 102 has come into contact.

As shown in (b) and (c), when the hole Wb is not formed at all due to breakage of the tool, or when the hole Wb having a smaller hole diameter is formed due to a tool mounting error, or due to a part of the tool being broken, the hole Wb Is not machined to the specified depth, the tip of the shaft body 103 hits the bottom of the hole Wb sooner than the end of the shaft body 103 abuts against the end surface Wa or the end surface 102 abuts the end surface Wa, and the end surface Wa A gap is formed between the end face 102 and the air ejection hole 104 is not blocked. Therefore, the air ejected from the opening of the air ejection hole 104 leaks from the gap, and the pressure rise due to the contact between the end surface Wa of the workpiece W and the end surface 102 of the main body 101 does not occur, and the end surface Wa of the workpiece W Therefore, the determination unit 14 determines that an abnormality has occurred in the processing of the workpiece W.
In this embodiment, as described above, the processing abnormality of the hole Wb can be detected by detecting the contact between the workpiece W and the workpiece detector 10 'based on the increase in air pressure.

[Description of processing steps]
FIG. 6 is a diagram illustrating an example of a machining process in which the workpiece positioning and the machining inspection are simultaneously performed using the workpiece detection device 10 ′ of the second embodiment.
In this example, a long workpiece W is gripped by the chuck of the spindle 21 of the machine tool shown in FIG. 4, and the workpiece W is fed into one product (product dimensions) by a bar feeder not shown arranged behind the spindle 21. It is assumed that the product is continuously processed while being fed in increments of (cut-off width). Further, it is assumed that the workpiece detection device 10 ′ is attached to the tool post 23 of the tool post 22.

As shown to (a), the front-end | tip of the workpiece | work W is cut off with the cut-off tool Ta, and the finished product P is cut off.
Next, the drill Tb is indexed to the machining position by the tool indexing operation of the tool post 22 (see FIG. 4) in the Y-axis direction, and the end surface Wa of the workpiece W is preset by the drill Tb as shown in FIG. A hole Wb having a diameter and a depth is formed.
After the processing of the hole Wb is finished, the workpiece detection device 10 'is indexed to a position facing the workpiece W by the tool indexing operation in the Y-axis direction of the tool post 22 (see FIG. 4), and as shown in FIG. Position to. Then, as shown in (d), the work W is sent until it comes into contact with the end face 102 of the work detection device 10 '. The end surface Wa of the workpiece W is brought into contact with the end surface 102 of the workpiece detection device 10 'so that the tip of the workpiece W is positioned. At the same time, the position inspection of the workpiece W and the inspection of the processing of the hole Wb are performed. As a result of the inspection, if it is determined that the positioning and processing are normally performed, the process returns to (a) and the operations (b) to (d) are repeated.

[Third embodiment of workpiece detection apparatus]
In the second embodiment, the hole Wb has been described as an example of the uneven shape, but the present invention can also be applied to other uneven shapes other than the hole.
FIGS. 7A and 7B relate to a third embodiment of the workpiece detection apparatus according to the present invention, in which FIGS. 7A and 7C are cross-sectional views of the tip portion explaining the configuration and operation, and FIG. 7B is a front view of the workpiece detection apparatus. It is.
In FIG. 7, the same parts and members as those of the workpiece detection device of the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In this embodiment, the workpiece W ′ is formed by cutting a part of the end face Wa ′ in the Y-axis direction while moving a tool such as an end mill in the Y-axis direction, thereby forming a stepped notch Wb ′. Shall be. Further, the workpiece detection device 10 ″ of this embodiment is similar to the workpiece detection device 10 of the first embodiment in that the main body 101, the through hole 101a, the spiral hole 101b, the groove 101c, the small diameter portion 101d, the air jet port 104, An air circulation hole 105, a bolt 106, and the like are provided.

In the workpiece detection device 10 ″, instead of the shaft body 103 of the second embodiment, a block-shaped gauge member 120 is integrally attached to one end of the main body 101. In this third embodiment, the main body The “apparatus main body” of the present invention is configured including the gauge member 120 integrally attached to 101.
As shown in FIG. 7A, the gauge member 120 has a stepped contact surface 121a formed at a shape matching the end surface Wa ′ and the notch Wb ′ of the workpiece W ′ at one end. 121 and a shaft portion 122 that protrudes from the other side of the gauge portion 121 and is inserted into the through hole 101 a of the main body 101. A flat surface 122 a is formed on the outer peripheral surface of the shaft portion 122, and the gauge member 120 is fixed to the main body 101 at a predetermined rotation angle position by a bolt 106 screwed into the spiral hole 101 b of the main body 101.

A plurality of air ejection holes 121 b communicating with each of the air ejection holes 104 of the main body 101 are formed inside the gauge portion 121. Each of the air ejection holes 121b is opened at a contact surface 121a that contacts the workpiece W ′. As shown in FIG. 7B, in this embodiment, the air ejection hole 121b is a part of the upper portion of the stepped contact surface 121a formed in accordance with the shape of the end surface Wa of the workpiece W ′. It is opened at three places, the place and the lower part.
By doing so, for example, as shown in FIG. 7C, a part of a tool such as an end mill is missing, and a machining residue is generated between the end face Wa ′ and the notch Wb ′. In such a case, the contact surface 121a cannot be brought into contact with the end surface Wa ′ of the workpiece W ′ due to the processing residue, so that the air ejected from the air ejection hole 121b is generated from the gap between the gauge member 120 and the workpiece W. Since the leakage occurs, it is possible to determine that an abnormality has occurred in machining because the contact between the contact surface 121a and the end surface Wa ′ of the workpiece W ′ cannot be detected.
Note that, as in the second and third embodiments, even if the shaft body 103 and the gauge member 120 that are gauge members are protruded from the main body 101, one or a plurality of air ejections are performed as in the first embodiment. It is easy to form the hole 104 on the outside of the shaft body 103 or the gauge member 120, and it is easy to manufacture a workpiece detection device that includes the shaft body 103 or the gauge member 120 and includes a plurality of air ejection holes 104. Can do.

Although preferred embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments.
For example, in the second and third embodiments, the workpiece gripped by the chuck of the main shaft is processed to form holes and notches, and these holes and notches are inspected. However, these embodiments are described. Can also be applied when using workpieces with holes and notches formed in advance. Defective workpieces with no holes or notches are mistakenly mixed with workpieces supplied to the spindle chuck. Even so, this defective workpiece can be detected.

  The present invention can be applied to all kinds of equipment that processes a workpiece, such as a machine tool or an assembly machine that performs plastic processing on a workpiece.

The first embodiment of the present invention in which the workpiece detection device is applied to the workpiece position inspection, (a) is a diagram for explaining the overall configuration of the workpiece position inspection system including the workpiece detection device of this embodiment, (b) ) Is a cross-sectional view of the workpiece detection device, (c) is a front view of the workpiece detection device, and (d) is a partially enlarged view for explaining the relationship between the depth of the groove and the hole diameter of the air ejection hole. It concerns on 2nd embodiment of the workpiece | work detection apparatus of this invention, (a) is sectional drawing of the workpiece | work detection apparatus of this embodiment, (b) is a front view of a workpiece | work detection apparatus. It is an expanded sectional view of the front-end | tip part of the workpiece | work detection apparatus which shows the other example which screwed the seal member to the main body. The example which attached the workpiece | work detection apparatus of 2nd embodiment to machine tools, such as NC lathe, is shown. It is a figure explaining the effect | action of the workpiece | work detection apparatus of 2nd embodiment. It is a figure which shows an example of the process which performs the positioning of a workpiece | work and a process inspection simultaneously using the workpiece | work detection apparatus of 2nd embodiment. It concerns on 3rd embodiment of the workpiece | work detection apparatus of this invention, (a) And (c) is sectional drawing of the front-end | tip part explaining the structure and effect | action, (b) is a front view of a workpiece | work detection apparatus.

Explanation of symbols

1: Work position inspection system 10, 10 ', 10 ": Work detection device 101: Main body (device main body)
101a: Through hole 101b: Spiral hole 101c: Concave groove 101d: Small diameter part 102: End surface 103: Shaft body 103a: Flat surface 103b: Scale 104: Air ejection hole 105: Air flow hole 106: Bolt 108: Seal member 109: Connector 110: Flat surface 111: Bolt 11: Air supply source 12: Pressure gauge 13: Drive unit 14: Determination unit

Claims (7)

An air ejection hole is provided in the apparatus main body arranged opposite to the work, and the air ejection hole is closed by the work abutting on the apparatus main body due to relative movement between the apparatus main body and the work. In the workpiece detection device that is disposed in the device main body and detects the contact of the workpiece with the device main body based on a change in the pressure of the air in the air ejection hole with relative movement between the workpiece and the device main body.
Forming a ditch on the outer peripheral surface of the device body,
The air ejection hole is communicated with the concave groove,
A seal member for closing the concave groove from the outer peripheral side is detachably attached to the outer peripheral surface of the apparatus main body,
Injecting air from the air ejection holes by supplying compressed air into the recessed grooves in the closed state;
Work detection device characterized by The apparatus body is provided with a gauge member that engages with the uneven portion of the workpiece, and the air ejection hole is disposed so as to be closed by the workpiece when the gauge member engages with the uneven portion. The work detection apparatus according to claim 1, wherein The workpiece detection apparatus according to claim 2, wherein the gauge member is provided so that the position of the gauge member is adjustable or exchangeable with respect to the apparatus main body. The apparatus main body is mounted on the moving body of a device having a main shaft provided with a chuck for gripping a work and a moving body movable relative to the main shaft, and the work body and the apparatus main body are relatively The workpiece detection device according to claim 1, wherein the contact of the workpiece with the device main body is detected by movement. An apparatus main body arranged opposite to the work (W) is provided with an air ejection hole so as to be closed by the work contacting the apparatus main body by relative movement of the apparatus main body and the work. In a workpiece detection method for detecting contact of the workpiece with the apparatus main body based on a change in air pressure in the air ejection hole due to relative movement between the workpiece and the workpiece,
A groove is formed on the outer peripheral surface, an air ejection hole is communicated with the groove, and the apparatus body is prepared by closing the groove with a seal member from the outer peripheral side,
Injecting air from the air ejection holes by supplying compressed air into the recessed grooves in the closed state;
A workpiece detection method characterized by A gauge member that engages with the uneven portion of the workpiece is provided in the apparatus main body, and the air ejection hole is disposed so as to be closed by the workpiece when the gauge member engages with the uneven portion. The workpiece detection method according to claim 5. A machine tool comprising the workpiece detection device according to claim 1.

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