JP2017072500A - Work dimension checking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work dimension checking device that can check dimensions of a work with high accuracy.SOLUTION: A work dimension checking device 10A comprises: a scale 12; a table 22 that is freely movable in a Y-direction; a reading head 23 that is provided in the table 22; a guide pin 24 that is provided in the table 22, and contacts with a process surface 2 of a work W; a gantry loader 30; a touch switch 40; and a dimension checking unit 53. The gantry loader 30 is configured to move the work W in a state where the guide pin 24 is brought into contact with the process surface 2 until contacting with the touch switch 40, and move the table 22 in the Y-direction of the scale 21 in conjunction with the work W. The dimension checking unit 53 is configured to compare a scale value read by the reading head 23 when the contact is detected with the touch switch 40 with a reference scale value, and check relative dimensions of the process surface 2 with respect to reference dimensions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a workpiece dimension confirmation device.

  2. Description of the Related Art Conventionally, there is known a workpiece dimension confirmation device that confirms a dimension of a workpiece processed by a machine tool. As a technique related to such a workpiece dimension checking device, Patent Document 1 describes an out-of-machine measuring device for a machine tool. The apparatus described in Patent Document 1 includes a workpiece mounting table provided in a transportable range of a gantry loader, a sensor mounting table installed on the workpiece mounting table, and a work contact touch sensor provided on the sensor mounting table. And comprising. The workpiece is carried on the workpiece mounting table by the gantry loader, and the sensor mounting base is driven back and forth until the touch sensor comes into contact with the carried workpiece, and the dimension of the workpiece is measured based on the coordinate value at the time of the contact.

JP-A-5-208345

  By the way, in the workpiece dimension checking device, the workpiece is applied to the touch sensor while the workpiece is held by the workpiece holding portion of the gantry loader, and the coordinate value of the gantry loader at that time is calculated from the driving amount of the driving motor of the gantry loader, for example. In some cases, the dimensions of the workpiece may be confirmed based on these coordinate values. However, the gantry loader is configured to grip a workpiece with a workpiece gripping portion provided at the lower end of a vertically extending lifting rod. Therefore, due to the configuration, the lower end side (work gripping portion side) of the lifting rod may be tilted or swayed unintentionally. As a result, for example, there is a delay in the work position relative to the position of the work or the driving of the drive motor, and errors may be included in the confirmed work dimensions, making it difficult to check the work dimensions accurately. There is.

  Then, an object of this invention is to provide the workpiece dimension confirmation apparatus which can confirm the dimension of a workpiece | work accurately.

  A workpiece dimension confirmation apparatus according to the present invention is a workpiece dimension confirmation apparatus for confirming the dimension of a workpiece processed by a machine tool, and is provided on a scale, a table movable along the extending direction of the scale, and the table. A read head for reading a scale scale value; a contact member provided on a table that contacts a work surface of the work; a work moving member that grips the work and moves the work along the extending direction of the scale; and the scale. Refer to the reference scale value related to the dimensions of the master workpiece, the fixed point that can be contacted with the workpiece moving member, the contact detection unit that detects the contact between the workpiece moving member and the fixed point And a dimension confirmation unit for confirming the relative dimension of the workpiece with respect to the dimension of the master workpiece based on the scale value read by the reading head. The workpiece moving member moves the table in a state where the contact member is in contact with the processing surface until at least the fixed point comes into contact, thereby moving the table along the extending direction of the scale along with the workpiece. The confirmation unit confirms the relative dimension of the workpiece by comparing the scale value read by the reading head with the reference scale value when the contact detection unit detects the contact between the workpiece moving member and the fixed point.

  In this workpiece dimension checking device, the workpiece moving member that grips the workpiece is applied to a fixed point, and the workpiece is compared with the reference scale value from the scale value when the workpiece moving member is securely positioned at a fixed position. The relative dimensions of can be confirmed. Therefore, for example, it can be suppressed that the position of the work is shaken and an error is included in the dimension confirmation, and the dimension of the work can be confirmed with high accuracy.

  In the workpiece dimension checking device according to the present invention, the workpiece moving member may be a gantry loader that transports a workpiece processed by a machine tool. According to this configuration, the gantry loader is used as the workpiece moving member, and for example, the workpiece dimensions can be confirmed promptly after machining by the machine tool, and the machining efficiency can be improved.

  In the workpiece size confirmation device according to the present invention, the contact detection unit may include a touch switch that contacts the dog of the workpiece moving member, and the touch switch may constitute a fixed point. According to this configuration, it is possible to increase the repeatability in detecting the contact between the workpiece moving member and the fixed point, and thus increase the repeatability in checking the dimensions of the workpiece.

  In the workpiece dimension checking apparatus according to the present invention, the contact member may be a guide pin including a column body standing on the table and a probe that is provided at a tip portion of the column body and can contact the processing surface. . In this case, it is possible to stably check the dimension of the processed surface of the workpiece.

  In the workpiece dimension checking device according to the present invention, the fixed point has a first fixed point and a second fixed point that is separated from the first fixed point in the extending direction of the scale, and the workpiece moving member is at least By moving the workpiece to one side in the stretching direction of the scale with the contact member in contact with the work surface until the first fixed point is touched, the table is moved to one side in the stretching direction of the scale along with the workpiece. By moving the workpiece to the other side of the scale in the extending direction of the scale with the contact member in contact with the processing surface until at least the second fixing point is contacted, the table is moved to the other side of the scale in the extending direction of the scale. The dimension confirmation unit compares the scale value read by the reading head with the reference scale value when the contact detection unit detects contact between the workpiece moving member and the first fixed point. The first relative dimension of the workpiece is confirmed, and the scale value read by the reading head when the contact detection unit detects the contact between the workpiece moving member and the second fixed point is compared with the reference scale value. Thus, the second relative dimension of the workpiece may be confirmed.

  According to this configuration, even when the workpiece moving member and the workpiece gripped by the workpiece moving member are misaligned in the extending direction of the scale, by considering both the first relative dimension and the second relative dimension, It is possible to accurately check the dimensions of the workpiece by canceling the adverse effects of misalignment.

  In the workpiece dimension checking device according to the present invention, the extending direction of the scale may be the vertical direction. According to this configuration, it is possible to reduce, for example, structural gaps and margins (so-called play) existing in the read head by using gravity, and it is possible to check the dimensions of the workpiece with higher accuracy.

  The workpiece dimension confirmation apparatus according to the present invention may include a lowering restricting portion that restricts lowering due to the weight of the table. According to this configuration, the table can be prevented from falling by its own weight. For example, when the table is stationary, the stationary state can be maintained.

  In the workpiece dimension checking apparatus according to the present invention, the workpiece moving member may move the workpiece until it contacts the fixed point at the second speed lower than the first speed after moving the workpiece at the first speed. . According to this configuration, the movement speed of the workpiece is reduced before the contact is detected by the contact detection unit, and the adverse effect of the time lag between the timing at which the contact is detected by the contact detection unit and the timing at which the scale value is read by the reading head is suppressed. It becomes possible.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the workpiece dimension confirmation apparatus which can confirm the dimension of a workpiece | work accurately.

It is a schematic front view which shows the structure of the workpiece dimension confirmation apparatus which concerns on 1st Embodiment. It is a schematic plan view which shows the linear scale of FIG. (A) is a figure explaining operation | movement of the workpiece dimension confirmation apparatus of FIG. (B) is another figure explaining operation | movement of the workpiece dimension confirmation apparatus of FIG. (A) is a schematic front view which shows a part of structure of the workpiece dimension confirmation apparatus concerning 2nd Embodiment. (B) is a schematic side view which shows the linear scale of FIG. (A) is a figure explaining operation | movement of the workpiece dimension confirmation apparatus which concerns on a modification. (B) is another figure explaining operation | movement of the workpiece dimension confirmation apparatus which concerns on a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements will be denoted by the same reference numerals, and redundant description will be omitted. The “X direction” is a direction along the horizontal direction, the “Y direction” is a direction along the horizontal direction and orthogonal to the X direction, and the “Z direction” is a direction along the vertical direction.

[First Embodiment]
As shown in FIG. 1, the workpiece size confirmation device 10 </ b> A according to the first embodiment is a device for confirming the size of a workpiece W processed by the machine tool 1. 10 A of workpiece dimension confirmation apparatuses are provided with the linear scale 20, the table 22, the guide pin 24, the gantry loader 30, the touch switch 40, and the control apparatus 50. FIG.

  The machine tool 1 is a machine that applies a grinding process, a polishing process, a rolling process, a forging process, a cutting process, a punching process, a bending process, or the like to the workpiece W to process it into a target shape. For example, the machine tool 1 is an NC machine tool that performs NC (Numerical Control) processing, and includes at least a lathe that performs cutting on the workpiece W. The machine tool 1 is not particularly limited, and various machines can be applied.

  The workpiece W is a processing object formed of, for example, metal or resin. The workpiece | work W here is exhibiting the cylindrical shape, and let the inner peripheral surface be the processing surface 2 which is a cutting surface. The shape of the workpiece W is not particularly limited, and may be other shapes. The processing surface 2 is not particularly limited as long as it is a surface formed by processing with the machine tool 1, and may be a polishing surface or the like.

  As shown in FIGS. 1 and 2, the linear scale 20 includes a scale 21 and a read head 23. The scale 21 is fixed to the bed 25 and extends on the bed 25 along the Y direction. The scale 21 includes a scale. For example, the scale is set in increments of 0.1 μm. The reading head 23 is a reading device that reads the scale value of the scale 21. The reading head 23 is provided on a table 22 described later. The reading head 23 outputs the read scale value of the scale 21 to the control device 50.

  The form of the linear scale 20 is not particularly limited. For example, the linear scale 20 may be an optical linear scale in which the scale 21 includes a scale having a lattice structure and the scale having the lattice structure is read by the reading head 23. Alternatively, for example, the linear scale 20 may be a magnetic linear scale in which the scale 21 includes magnetic lattice fringes as scales, and the magnetic lattice fringes are read by the read head 23.

  The table 22 is disposed on the bed 25 so as to be movable (linearly movable) along the Y direction. In the illustrated example, the table 22 has a plate shape whose thickness direction is the Z direction. The table 22 is guided to move in the Y direction by a guide rail 26. The guide rail 26 is fixed to the bed 25 and extends along the Y direction on the bed 25.

  The guide pin 24 is a contact member that contacts the processing surface 2 of the workpiece W. The guide pin 24 is provided on the table 22. The guide pin 24 includes a column body 24a and a probe 24b. The column body 24a has a column shape and is erected on the table 22 (in other words, provided to stand along the Z direction). The probe 24b is a member that can come into contact with the processing surface 2 and constitutes a probe portion for checking the dimensions of the processing surface 2. The probe 24b is provided at the tip of the column body 24a. The shape of the probe 24b is not particularly limited, but here is a spherical shape.

  As shown in FIG. 1, the gantry loader 30 is a gantry loader that transports a workpiece W processed by the machine tool 1. The gantry loader 30 constitutes a workpiece moving member that holds the workpiece W and moves the workpiece W along the extending direction of the scale 21. The gantry loader 30 includes a traveling platform 31, a lifting rod 32, and a work gripping portion 33.

  The traveling table 31 is provided so as to be movable in the Y direction along the installation rail L. The traveling platform 31 is provided so as to be movable in the X direction. The traveling table 31 is driven in the X direction and the Y direction by the motor 35 via a rack and pinion mechanism. The elevating rod 32 is provided so as to be movable (movable up and down) in the Z direction with respect to the traveling platform 31. The elevating rod 32 is driven in the Z direction by a motor 35 via a rack and pinion mechanism.

  The workpiece gripping part 33 is a part that grips the workpiece W and is provided at the lower end of the lifting rod 32. The workpiece gripping part 33 grips the workpiece W by clamping the workpiece W in a direction orthogonal to the axial direction. The workpiece gripping portion 33 includes two chucks 33a and 33b that can grip the workpiece W in a downward posture and a lateral posture. The chucks 33a and 33b can switch their positions (that is, their postures). Note that the workpiece gripping part 33 may grip the workpiece W by suction, for example.

  The dog 34 is a part that contacts the touch switch 40. The number of dogs 34 corresponding to the number of touch switches 40 is provided. The dog 34 is provided at a position corresponding to the touch switch 40 (here, facing the touch switch 40 in the Y direction). The dog 34 includes a first dog 34a and a second dog 34b. The first dog 34a is provided on one side in the Y direction of the chuck 33a of the workpiece gripping part 33 so as to protrude to one side in the Y direction. The second dog 34b is provided on the other side in the Y direction of the chuck 33a of the workpiece gripping portion 33 (on the opposite side to the one side in the Y direction) so as to protrude to the other side in the Y direction.

  The touch switch 40 is a contact-type measuring instrument provided so as to be able to contact the dog 34 of the gantry loader 30. The touch switch 40 is turned on when it comes into contact with the dog 34 of the gantry loader 30 and outputs a touch signal to the control device 50. The touch switch 40 is disposed on the bed 25 so that the position relative to the scale 21 is fixed. The touch switch 40 includes a first touch switch 40a and a second touch switch 40b. The first touch switch 40a is fixed to the end portion on one side in the Y direction of the scale 21 on the bed 25 via a support member 41a. The first touch switch 40a can be in contact with the first dog 34a in the Y direction, and is disposed to face the other side in the Y direction.

  The second touch switch 40b is fixed on the other end of the scale 21 on the other side in the Y direction on the bed 25 via a support member 41b. The second touch switch 40b is arranged on the other side in the Y direction with respect to the first touch switch 40a. The second touch switch 40b can be in contact with the second dog 34b in the Y direction, and is installed to face one side in the Y direction.

  Such a touch switch 40 constitutes a contact detection unit that detects contact with the gantry loader 30. The touch switch 40 (first and second touch switches 40a and 40b) constitutes a fixed point (first and second fixed points). The fixed point is a part that is arranged so that the relative position with respect to the scale 21 is fixed and contacts the gantry loader 30 at least by point contact.

  The control device 50 includes, for example, an input / output interface I / O that performs input / output of signals to / from the outside, a ROM that stores programs and various information for processing, a RAM that temporarily stores data, an HDD, and the like Storage medium, CPU, and communication circuit. The control device 50 stores input data in a RAM based on a signal output from the CPU, loads a program stored in the ROM into the RAM, and executes the programs loaded in the RAM, thereby executing various types of programs described later. Realize the function.

  The control device 50 includes a motor drive control unit 51, a storage unit 52, and a dimension confirmation unit 53 as functional configurations. The motor drive control unit 51 controls the movement of the gantry loader 30 in each of the X direction, the Y direction, and the Z direction by controlling the operation of the motor 35.

  Specifically, the motor drive control unit 51 controls the movement of the work gripping unit 33 of the gantry loader 30 as follows. That is, the workpiece gripping portion 33 is moved so that the probe 24b of the guide pin 24 is positioned in the cylindrical hole of the workpiece W in a state where the axial direction of the gripped workpiece W is the Z direction. In this state, the workpiece gripping portion 33 is moved along the Y direction until at least the dog 34 contacts the touch switch 40. As a result, the workpiece W is moved in the Y direction while the probe 24b is in contact with the machining surface 2, and the table 22 is moved in the Y direction along with the workpiece W. In other words, the operation of the gantry loader 30 is controlled by the motor drive control unit 51, and the workpiece W is moved with the guide pin 24 in contact with the processing surface 2 until at least the touch switch 40 is contacted. The table 22 is moved along the Y direction.

  The motor drive control unit 51 moves the workpiece gripping unit 33 at the first speed until the dog 34 enters an approach state in which the dog 34 approaches the touch switch 40 (hereinafter simply referred to as “approach state”) exceeding a predetermined threshold. Move along the direction. Accordingly, the workpiece W is moved along the Y direction at the first speed until the approach state is reached. Then, the motor drive control unit 51 moves the workpiece gripping unit 33 along the Y direction at a second speed lower than the first speed until the dog 34 contacts the touch switch 40 from the approach state. Accordingly, the workpiece W is moved along the Y direction at the second speed until the dog 34 contacts the touch switch 40 from the approach state. The first speed and the second speed are preset speeds, which may be constant values or variable values.

  In the storage unit 52, a reference scale value relating to a reference dimension which is a dimension of the master work is stored in advance. The master workpiece is a regular workpiece (a workpiece that serves as a reference) that is a target of machining by the machine tool 1. The reference dimension is a true value of the dimension of the master workpiece and is a target normal dimension. In this embodiment, since the processing surface 2 of the workpiece W is an inner peripheral surface, the reference dimension is an inner diameter dimension.

  The reference scale value is a scale value read by the reading head 23 when confirming the dimensions of the master work under the same conditions as the conditions for confirming the dimensions of the work W. The reference scale value can be acquired in advance as follows. That is, the master work is gripped by the work gripping portion 33 of the gantry loader 30. The work gripper 33 moves the master work in the Y direction in a state where the probe 24b of the guide pin 24 is in contact with the processed surface of the gripped master work. As a result, the table 22 is moved in the Y direction along with the master work. Then, the scale value read by the reading head 23 when the dog 34 contacts the touch switch 40 is acquired as the reference scale value.

  Specifically, the reference scale value is read by the reading head 23 when the first dog 34a is in contact with the first touch switch 40a while the probe 24b is in contact with the Y direction other side of the inner peripheral surface of the master work. The second reference scale value is read by the reading head 23 when the second dog 34b comes into contact with the second touch switch 40b while the probe 24b is in contact with one side in the Y direction of the processing surface 2 of the master workpiece. And a reference scale value.

  In the storage unit 52, dimensions of the workpiece W corresponding to one scale of the scale 21 are stored in advance. For example, the dimension of the workpiece W corresponding to one scale of the scale 21 may be stored by external input, or may be calculated and stored from the reference dimension and the reference scale value of the master workpiece. For example, 0.01 mm is stored as the dimension of the workpiece W corresponding to one scale of the scale 21. The storage unit 52 stores a first speed and a second speed in advance. The storage unit 52 stores the threshold value for determining the approach state in advance.

  The dimension confirmation unit 53 refers to the reference scale value stored in the storage unit 52 and based on the scale value read by the reading head 23, the relative dimension of the workpiece W with respect to the reference dimension (dimensional difference from the master workpiece). Confirm. The dimension confirmation unit 53 confirms the relative dimension of the machining surface 2 of the workpiece W by comparing the scale value read by the reading head 23 when the touch switch 40 detects contact with the reference scale value. .

  Specifically, the dimension confirmation unit 53 acquires the scale value of the scale 21 read by the reading head 23 over time in association with time, and acquires real-time scale data that is time-series data of the scale value. From the acquired real-time scale data, the scale value at the timing when the touch signal from the touch switch 40 rises is extracted. A scale difference between the extracted scale value and the reference scale value is calculated. Then, based on the calculated scale difference, the value of the relative dimension of the machining surface 2 is calculated based on the dimension of the workpiece W corresponding to one scale of the scale 21.

  Next, the operation at the time of confirming the dimension of the workpiece W in the workpiece dimension confirming apparatus 10A will be described in detail with reference to FIG.

  In the workpiece dimension checking apparatus 10A, after machining the workpiece W in the machine tool 1, the movement of the gantry loader 30 is controlled by the motor drive control unit 51, and the workpiece W gripped by the workpiece gripping portion 33 is moved outside the machine tool 1. . Then, while holding the workpiece W, the probe 24b of the guide pin 24 is arranged in the cylindrical hole of the workpiece W in a state where the axial direction of the workpiece W is the Z direction.

  Subsequently, the movement of the gantry loader 30 is controlled by the motor drive control unit 51, and as shown in FIG. 3A, the work gripping part 33 that grips the work W is moved to the Y direction one side at the first speed. . The probe 24b is brought into contact with the other side of the processing surface 2 in the Y direction, and in this contact state, the workpiece W is further moved to one side in the Y direction, and the table 22 is moved to one side in the Y direction via the guide pins 24. As a result, the table 22 is moved to one side in the Y direction with the workpiece W at the first speed.

  After entering the approach state, the moving speed of the work gripping portion 33 is switched to the second speed, and the work gripping portion 33 is moved to one side in the Y direction at the second speed. Accordingly, the table 22 is moved to one side in the Y direction with the workpiece W at the second speed. When the workpiece gripping part 33 is moved to one side in the Y direction, the dimension confirmation part 53 acquires the scale value of the scale 21 from the reading head 23 over time, and the real-time scale that is time series data of the scale value. Get the data.

  When the first dog 34a of the work gripping portion 33 hits the first touch switch 40a, the first touch switch 40a is turned on, and a touch signal is output from the first touch switch 40a to the dimension confirmation portion 53. The dimension confirmation unit 53 extracts the scale value at the timing when the touch signal rises in the acquired real-time scale data as the first scale value. Then, the scale difference between the extracted first scale value and the first reference scale value is calculated, and the value of the first relative dimension of the machining surface 2 is calculated based on the dimension corresponding to one scale of the scale 21 from the scale difference. Calculate and confirm.

  For example, as illustrated in FIG. 3A, when the first scale value read is “10” and the first reference scale value is “12”, the dimensions of the master workpiece are checked when the dimensions of the workpiece W are confirmed. It can be determined that the probe 24b is located on one side (the left side in the drawing) from the time of confirmation, and the inner diameter of the processed surface 2 of the workpiece W is smaller than that of the master workpiece. In this case, for example, a value of “−0.02 mm” is calculated and confirmed as the first relative dimension.

  Subsequently, the movement of the gantry loader 30 is controlled by the motor drive control unit 51, and as shown in FIG. 3B, the work gripping part 33 that grips the work W is moved to the other side in the Y direction at the first speed. . The probe 24b is brought into contact with one side of the processing surface 2 in the Y direction, and in this contact state, the workpiece W is further moved to the other side in the Y direction, and the table 22 is moved to the other side in the Y direction via the guide pins 24. Accordingly, the table 22 is moved to the other side in the Y direction at the first speed along with the workpiece W.

  After entering the approach state, the moving speed of the work gripping portion 33 is switched to the second speed, the work gripping portion 33 is moved to the other side in the Y direction at the second speed, and the table 22 is moved to the other side in the Y direction. To the side at a second speed. When the work gripping part 33 is moved to the other side in the Y direction, the dimension confirmation part 53 acquires the scale value of the scale 21 from the reading head 23 over time, and the real-time scale is time series data of the scale value. Get the data.

  When the second dog 34b of the workpiece gripping part 33 hits the second touch switch 40b, the second touch switch 40b is turned on, and a touch signal is output from the second touch switch 40b to the dimension confirmation part 53. The dimension confirmation unit 53 extracts the scale value at the timing when the touch signal rises in the acquired real-time scale data as the second scale value. Then, a scale difference between the extracted second scale value and the second reference scale value is calculated, and the value of the second relative dimension of the machining surface 2 is calculated based on the dimension corresponding to one scale of the scale 21 from the scale difference. Calculate and confirm.

  For example, as illustrated in FIG. 3B, when the second scale value read is “90” and the reference scale value is “91”, when the dimension of the workpiece W is confirmed, the dimension of the master workpiece is confirmed. It can be determined that the probe 24b is located on one side (the left side in the figure) and the inner diameter of the processed surface 2 of the workpiece W is larger than that of the master workpiece. In this case, for example, a value of “+0.01 mm” is calculated and confirmed as the second relative dimension.

  In addition, after calculating the values of the first and second relative dimensions, the dimension confirmation unit 53 adds the values of the first and second relative dimensions, and calculates the relative difference between the inner diameter of the workpiece W and the inner diameter of the master workpiece. Calculate and confirm the inner diameter value. For example, when the value of the first relative dimension is “−0.02 mm” and the value of the second relative dimension is “+0.01 mm”, the value of the relative inner diameter is “−0.01 mm”. That is, it is confirmed that the work W has an inner diameter smaller by 0.01 mm than the master work. Then, the confirmation result (first relative dimension, second relative dimension, and / or relative inner diameter) of the machining surface 2 of the workpiece W is fed back from the dimension confirmation unit 53 to the machine tool 1.

  As described above, in the workpiece dimension checking apparatus 10A, the scale when the dog 34 of the gantry loader 30 that holds the workpiece W with the workpiece gripping portion 33 is applied to the touch switch 40 and the workpiece gripping portion 33 is reliably positioned at a predetermined position. From the scale value of 21, the dimension of the work W can be confirmed by comparison with the reference scale value of the master work. Therefore, for example, it can be suppressed that the position of the work W is blurred and an error is included in the dimension confirmation. It becomes possible to accurately confirm the dimensions of the workpiece W.

  In the workpiece dimension checking apparatus 10A, even when the dimensions of a plurality of types of workpieces W are checked, it is not necessary to design and manufacture different dedicated tools for each shape of the workpieces W. It is not necessary to set the magnification required for normal dimension confirmation. Therefore, the dimension of the workpiece W can be easily confirmed, and the versatility of the dimension confirmation of the workpiece W can be enhanced.

  In the workpiece dimension confirmation apparatus 10A, the linear scale 20 is used for dimension confirmation of the workpiece W, and the dimension of the workpiece W can be confirmed by directly applying the probe 24b of the guide pin 24 to the processing surface 2 to be dimension confirmed. Therefore, compared with the case where the dimension of the workpiece W is confirmed using the driving amount of the motor 35 of the gantry loader 30 (for example, the output of the encoder provided in the motor 35), the workpiece relative to the positional deviation of the workpiece W or the driving of the motor 35 is compared. The adverse effect of the W tracking delay can be suppressed, and the dimensions of the workpiece W can be accurately confirmed.

  10 A of workpiece dimension confirmation apparatuses are provided with the gantry loader 30 as a workpiece | work moving member. Thereby, the dimension of the workpiece | work W can be confirmed promptly after the process with the machine tool 1 using the gantry loader 30, and it becomes possible to improve a process efficiency.

  In the workpiece size confirmation apparatus 10 </ b> A, the touch switch 40 detects contact with the dog 34 of the gantry loader 30. As a result, it is possible to increase the repeatability in contact detection, and thus to increase the repeatability in checking the dimensions of the workpiece W.

  10 A of workpiece | work dimension confirmation apparatuses are provided with the guide pin 24, and the probe 24b of the guide pin 24 contacts the process surface 2 of the workpiece | work W at the time of the dimension confirmation of the workpiece | work W. FIG. Thereby, it becomes possible to confirm the relative dimension of the processing surface 2 of the workpiece | work W stably. Since the probe 24b has a spherical shape, it is possible to easily perform point measurement on the processed surface 2.

  In the workpiece dimension confirmation apparatus 10A, the workpiece gripping portion 33 of the gantry loader 30 that grips the workpiece W is moved to both the one side in the Y direction and the other side in the Y direction to check the first relative dimension and the second relative dimension. Thereby, even when the gripped workpiece W is misaligned in the Y direction with respect to the workpiece gripping portion 33, the adverse effect of the misalignment is canceled by considering both the first relative dimension and the second relative dimension. Can fit. It becomes possible to accurately confirm the dimensions of the workpiece W.

  In the workpiece dimension checking apparatus 10A, after the workpiece W is moved in the Y direction at the first speed, the workpiece W is moved in the Y direction until it touches the touch switch 40 at the second speed that is lower than the first speed. Thereby, the moving speed of the workpiece W is reduced before the touch detection by the touch switch 40, and the adverse effect of the time lag between the timing when the touch is detected by the touch switch 40 and the timing when the scale value is read by the reading head 23 can be suppressed. It becomes possible.

  In the workpiece dimension checking apparatus 10A, the scale value of the scale 21 is read with the reading head 23 over time, and real-time scale data that is time-series data of the scale value is acquired. Then, of the acquired real-time scale data, the scale value at the timing when the touch signal from the touch switch 40 rises is compared with the reference scale value. As a result, it is possible to suppress an adverse effect of a time lag between the timing at which contact is detected by the touch switch 40 and the timing at which the reading value is read by the reading head 23.

  In addition, the dimension confirmation part 53 of this embodiment compared the scale value at the time of the touch signal from the touch switch 40 rising among the real-time scale data which is the time series data of the scale value with the reference scale value. However, it is not limited to this. For example, when the touch signal rises, the dimension confirmation unit 53 may cause the reading head 23 to read the scale value using this as a trigger and compare the scale value with the reference scale value. In short, the scale value read by the reading head when contact is detected with the touch switch 40 may be compared with the reference scale value.

[Second Embodiment]
Next, the workpiece dimension confirmation apparatus according to the second embodiment will be described. In the description of the present embodiment, the description overlapping with the first embodiment will be omitted, and different points will be described.

  As shown in FIG. 4A and FIG. 4B, the workpiece dimension checking device 10B according to the second embodiment is configured such that the extending direction of the scale 21 is the Z direction. That is, the scale 21 is fixed to the bed 25 via the support member 28 and extends along the Z direction on the bed 25. The table 22 is provided so as to be movable along the Z direction. The table 22 has a plate shape with the Y direction as the thickness direction. The table 22 is guided to move in the Z direction by a guide rail 26. The guide rail 26 is fixed to the bed 25 via the support member 28 and extends along the Z direction on the bed 25.

  The first dog 34 a is provided on one side (the upper side in the figure) of the chuck 33 b of the workpiece gripping part 33 so as to protrude to the one side in the Z direction. The second dog 34b is provided on the other side in the Z direction of the chuck 33b of the workpiece gripping portion 33 (on the opposite side to the one side in the Z direction, the lower side in the drawing) so as to protrude to the other side in the Z direction.

  The first touch switch 40a is fixed to the end of the scale 21 on one side in the Z direction via a support member 41a. The first touch switch 40a can be in contact with the first dog 34a in the Z direction, and is disposed so as to face the other side in the Z direction. The second touch switch 40b is fixed to the end of the scale 21 on the other side in the Z direction via a support member 41b. The second touch switch 40b is disposed away from the first touch switch 40a on the other side in the Z direction. The second touch switch 40b can be in contact with the second dog 34b in the Z direction, and is disposed to face one side in the Y direction.

  The motor drive control unit 51 (see FIG. 1) controls the movement of the gantry loader 30 by controlling the operation of the motor 35. Specifically, the movement of the workpiece gripper 33 of the gantry loader 30 is controlled as follows. That is, the workpiece gripping portion 33 is moved so that the probe 24b of the guide pin 24 is positioned in the cylindrical hole of the workpiece W in a state where the axial direction of the gripped workpiece W is the Y direction. In this state, the workpiece gripping portion 33 is moved along the Z direction until the dog 34 contacts the touch switch 40. Thereby, the workpiece W is moved in the Z direction in a state where the probe 24b is in contact with the machining surface 2, and the table 22 is moved in the Z direction along with the workpiece W. The workpiece gripper 33 is moved along the Z direction at the first speed until the approach state is reached, and the workpiece W is moved along the Z direction at the first speed. From the approach state, until the dog 34 contacts the touch switch 40, the workpiece gripper 33 is moved along the Z direction at the second speed, and the workpiece W is moved along the Z direction at the second speed.

  As shown in FIG. 4B, the workpiece size confirmation device 10 </ b> B further includes an air cylinder 60. The air cylinder 60 is a lowering restricting part that restricts lowering of the table 22 due to its own weight. In the illustrated example, the air cylinder 60 has a movable portion 62 movable in the Z direction via a rod 63 with respect to the main body portion 61 fixed on the bed 25 (see FIG. 4A). The movable part 62 is connected to the table 22 by a connecting part 64. The air cylinder 60 applies a constant upward force having a size corresponding to the weight of the table 22 from the movable portion 62 to the table 22 via the connecting portion 64. The air cylinder 60 moves in the Z direction following the elevation of the table 22 so that the constant force is always applied to the table 22. The air cylinder 60 is connected to the control device 50 (see FIG. 1), and the control device 50 controls the operation of the movable portion 62 of the air cylinder 60.

  Also in the workpiece dimension checking apparatus 10B configured as described above, the dog 34 of the gantry loader 30 that holds the workpiece W with the workpiece gripping portion 33 is applied to the touch switch 40, and the workpiece gripping portion 33 is securely placed at a predetermined position. The dimension of the workpiece W can be confirmed from the scale value of the scale 21 when positioned by comparison with the reference scale value of the master work. Therefore, the above-mentioned effect that the dimension of the workpiece W can be confirmed with high accuracy is achieved.

  In the workpiece dimension checking device 10B, the extending direction of the scale 21 is the Z direction, which is the vertical direction. Thereby, the structural gap and margin (so-called play) existing in the linear scale 20 can be reduced using gravity, and the dimensions of the workpiece W can be confirmed with higher accuracy.

  The workpiece dimension checking device 10B includes an air cylinder 60 that regulates the lowering of the table 22 due to its own weight. Thereby, it can suppress that the table 22 falls with dead weight, for example, when the table 22 is made stationary, it becomes possible to maintain the stationary state.

  In the present embodiment, the air cylinder 60 is used as the lowering restricting unit. However, instead of the air cylinder 60, another known device that can restrict the lowering of the table 22 by its own weight may be used. For example, a hydraulic cylinder, a chain balancer, a spring balancer, or the like may be used as the lowering restriction portion.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.

  In the above embodiment, the gantry loader 30 is provided as a workpiece moving member. However, instead of this, for example, a general robot arm or the like may be provided. As the workpiece moving member, various members, mechanisms, or apparatuses can be applied as long as they hold the workpiece W and move the workpiece W along the extending direction of the scale 21.

  In the embodiment described above, the touch switch 40 is provided at the end of the scale 21 in the Y direction. However, the position where the touch switch 40 is disposed is not limited, and the position relative to the scale 21 is fixed. Just do it. In the above embodiment, the confirmation of the relative dimension of the workpiece W with respect to the reference dimension has been confirmed by calculating the value of the relative dimension with respect to the reference dimension, but instead of or in addition to this, the dimension of the workpiece W is the reference dimension. It may be confirmed by determining whether or not.

  In the above embodiment, the touch switch 40 forms a fixed point, and the touch switch 40 detects the contact of the dog 34 of the gantry loader 30 with the touch switch 40. However, the configuration of detecting the contact of the gantry loader 30 with the fixed point is as follows. It is not limited. For example, the contact between the fixed point and the gantry loader 30 may be detected using another known sensor as the contact detection unit. In this case, the touch switch 40 does not need to constitute a fixed point, and the fixed point may be a part that is arranged so that the relative position to the scale 21 is fixed and can contact the gantry loader 30.

  In the above-described embodiment, the first relative dimension and the second relative dimension are confirmed by moving the workpiece W gripped by the workpiece gripping portion 33 to one side and the other side of the scale 21 in the extending direction, but the present invention is not limited to this. . For example, only the first relative dimension or the second relative dimension may be confirmed by moving the workpiece W gripped by the workpiece gripping portion 33 only to one side or the other side of the scale 21 in the extending direction.

  The above-described embodiment may include a fixing pin and a cylinder that restrict displacement (backlash) of the gantry loader 30 in the X direction. In this case, it is possible to suppress a phenomenon in which the contact position between the processing surface 2 of the workpiece W gripped by the workpiece gripping portion 33 and the probe 24b is shifted in the X direction (hereinafter referred to as “X misalignment”).

  For example, in the case of a workpiece W having an inner diameter φ44.0000 mm and an outer diameter φ86.0000 mm as reference dimensions, if the misalignment in the X direction is 1 mm, the confirmed dimension is an inner diameter φ43.95452 mm (error 45.48 μm) and the outer The diameter was 85.97674 mm (error 23.26 μm). When the misalignment in the X direction was 0.5 mm, the confirmed dimensions were an inner diameter φ43.98863 mm (error 11.37 μm) and an outer diameter φ85.99419 mm (error 5.81 μm). On the other hand, when the misalignment in the X direction is suppressed to 0.1 mm by the fixing pin and the cylinder, the confirmed dimensions are an inner diameter φ43.99995 mm (error 0.45 μm) and an outer diameter φ85.99997 mm (error 0.023 μm). It became. Thereby, it was confirmed that the effect of suppressing the misalignment in the X direction was significant in accurately confirming the dimensions of the workpiece.

  In the above embodiment, the inner peripheral surface of the workpiece W is the machining surface 2 and the inner diameter of the workpiece W is confirmed. However, the portion of the workpiece W whose dimensions are to be confirmed is not limited. For example, the outer peripheral surface of the workpiece W is the machining surface 2 and the outer diameter of the workpiece W may be confirmed. Thus, in the above embodiment, multi-item measurement can be performed.

  Further, for example, as shown in FIG. 5, a stepped cylindrical workpiece W1 having a small diameter portion 3 and a large diameter portion 4 is used as a workpiece, and the dimension H in the axial direction of the small diameter portion 3 of the workpiece W1 is confirmed. You can also. In the example shown in FIG. 5, a dog 34 protruding in the Y direction is provided on the other side of the workpiece gripping portion 33 in the Y direction. The touch switch 40 is fixed to the upper end of the scale 21 in the Z direction. The touch switch 40 can contact the dog 34 in the Z direction and is installed to face upward.

  In this case, when the dimension H of the workpiece W1 is confirmed, first, as shown in FIG. 5A, the workpiece gripping portion is in a state where the probe 24b is in contact with the end surface 3a of the small-diameter portion 3 which is the processing surface. 33 is moved downward. Accordingly, the work W1 is moved downward, and the table 22 is moved downward along with the work W1. The scale value read by the reading head 23 when the dog 34 contacts the touch switch 40 is compared with the reference scale value, and the relative dimension of the end surface 3a of the workpiece W1 is confirmed.

  Subsequently, as shown in FIG. 5B, the workpiece gripping portion 33 is moved downward in a state where the probe 24b is in contact with the end surface 4a of the large-diameter portion 4 which is a processing surface. Accordingly, the work W1 is moved downward, and the table 22 is moved downward along with the work W1. The scale value read by the reading head 23 when the dog 34 contacts the touch switch 40 is compared with the reference scale value, and the relative dimension of the end face 4a of the workpiece W1 is confirmed. And the relative dimension of the dimension H with respect to a reference | standard dimension is confirmed from the relative dimension of the end surfaces 3a and 4a of the workpiece | work W1.

  DESCRIPTION OF SYMBOLS 1 ... Machine tool, 2 ... Processing surface, 10A, 10B ... Work dimension confirmation apparatus, 20 ... Linear scale, 21 ... Scale, 22 ... Table, 23 ... Reading head, 24 ... Guide pin (contact member), 24a ... Column , 24b ... probe, 30 ... gantry loader (workpiece moving member), 34 ... dog, 40 ... touch switch (fixed point, contact detector), 40a ... first touch switch (first fixed point, contact detector), 40b ... second touch switch (second fixed point, contact detection part), 53 ... dimension confirmation part, 60 ... air cylinder (descent restriction part), W, W1 ... workpiece.

Claims (8)

A workpiece dimension confirmation device for confirming the dimension of a workpiece machined by a machine tool,
Scale and
A table movable along the extending direction of the scale;
A read head provided on the table for reading a scale value of the scale;
A contact member provided on the table and in contact with a machining surface of the workpiece;
A workpiece moving member that holds the workpiece and moves the workpiece along the extending direction of the scale,
A fixed point that is arranged so that a relative position to the scale is fixed and that can contact the workpiece moving member;
A contact detection unit that detects contact between the workpiece moving member and the fixed point;
With reference to a reference scale value related to the dimensions of the master work, and based on the scale value read by the reading head, a dimension confirmation unit that confirms the relative dimensions of the work with respect to the dimensions of the master work, and
The workpiece moving member is
The table is moved along the extending direction of the scale along with the workpiece by moving the workpiece with the contact member in contact with the processing surface until at least the contact with the fixed point,
The dimension confirmation part is
By comparing the scale value read by the reading head when the contact detection unit detects contact between the workpiece moving member and the fixed point, the reference scale value is used to determine the relative dimension of the workpiece. Work size confirmation device to check.   The workpiece dimension checking apparatus according to claim 1, wherein the workpiece moving member is a gantry loader that conveys the workpiece processed by the machine tool. The contact detection unit includes a touch switch that contacts a dog of the workpiece moving member,
The workpiece touch confirmation device according to claim 1, wherein the touch switch constitutes the fixed point.   4. The guide pin according to claim 1, wherein the contact member is a guide pin including a column body erected on the table and a probe that is provided at a front end portion of the column body and can contact the processing surface. The workpiece dimension confirmation apparatus according to one item. The fixed point has a first fixed point and a second fixed point that is separated from the first fixed point in the extending direction of the scale,
The workpiece moving member is
By moving the workpiece to one side in the extending direction of the scale in a state where the contact member is in contact with the processing surface until at least the first fixing point is contacted, the table is moved along with the workpiece to the scale. Moved to one side of the stretching direction,
By moving the workpiece to the other side in the extending direction of the scale in a state where the contact member is in contact with the processing surface until at least the second fixed point is contacted, the scale is moved along the workpiece to the scale. Moved to the other side of the stretching direction,
The dimension confirmation part is
By comparing the scale value read by the reading head when the contact detection unit detects contact between the workpiece moving member and the first fixed point, the reference scale value is compared with the first scale of the workpiece. Check the relative dimensions,
By comparing the scale value read by the reading head when the contact detection unit detects contact between the workpiece moving member and the second fixed point, the reference scale value is compared with the second value of the workpiece. The workpiece dimension confirmation apparatus according to any one of claims 1 to 4, wherein a relative dimension is confirmed.   The workpiece dimension checking device according to any one of claims 1 to 5, wherein an extending direction of the scale is a vertical direction.   The work dimension confirmation apparatus according to claim 6, further comprising a lowering restricting part that restricts lowering of the table due to its own weight.   The work moving member moves the work at a first speed, and then moves the work at a second speed lower than the first speed until it contacts the fixed point. The workpiece dimension confirmation device according to claim 1.

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