JP2022022722A - Pressure detection device - Google Patents

Abstract

To provide a pressure detection device which detects an applied pressure acting on a workpiece without directly receiving a processing pressure of a pressurizer.SOLUTION: A pressure detection device 30 detects a processing pressure with which a processing head 9 acts on a workpiece 2 placed on a pedestal 3 of a pressurizer 1, along a Y-axis direction perpendicular to a top surface 14 of the pedestal 3. A fixed support member 32 is fixed to a movable plate 5 of the pressurizer 1 and receives a driving force of the pressurizer. A strain transform unit 33 is fixed between the fixed support member 32 and the processing head. A buckling detection unit 40 capable of detecting a strain variation due to buckling of the strain transform unit is placed in a position eccentric from a shaft center line of the strain transform unit 33.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pressure detection device that detects a pressurized state when machining is performed by pressurization such as press working and press-fitting assembly.

In processing work such as press working and press-fitting assembly, it was not possible to visually confirm the judgment of non-defective products and defective products after processing. As shown in Patent Document 1, the pressure detection device includes a movable plate, a base plate on the work side, and a sensor unit. The sensor unit is sandwiched between the movable plate on the press-fitting device side and the base plate on the work side so as to receive a load in the upward direction of the working axis.

Japanese Unexamined Patent Publication No. 2019-181582

The pressure detection device of Patent Document 1 uses a quartz piezoelectric sensor as a sensor unit. A crystal piezoelectric sensor was detecting the load of the pressurizer. The sensor can be used only within the load capacity range, and it is difficult to use the pressure detection device when the load capacity of the sensor is smaller than the load applied to the work by the pressurizer.

Similarly, attaching a load cell or load sensor to the sensor unit could not be used because the load capacity of the sensor was smaller than the load applied to the work by the pressurizer. If a sensor with a large load capacity is used, the sensitivity becomes low and it becomes difficult to determine a defect.

The present invention has been created in view of this point, and an object of the present invention is to provide a pressure detecting device capable of detecting a machining pressure acting on a work without directly receiving the machining pressure of a pressurizing machine. It is in.

The pressure detecting device (30, 70) according to the present invention is a pressurizing machine along a direction perpendicular to the upper surface of the work (2) placed on the upper surface (14) of the pedestal (3) of the processing machine. It is a pressure detection device that detects the machining pressure acting on the work from the machining head (9) of (1).

It is fixed to the movable plate (5) of the pressurizer and is fixed between the fixed support member (32,73) that receives the machining pressure from the pressurizer, and the fixed support member and the machining head, and buckles according to the machining pressure. The strain fluctuation amount (ΔX) due to buckling of the strain conversion unit can be detected at a position eccentric from the strain conversion unit (33, 74, 94) that causes distortion due to the strain conversion unit and the axial center line (15) of the strain conversion unit. It is provided with a buckling detection unit (40, 60, 80, 100, 110).

As a result, the buckling detection unit detects the amount of strain fluctuation (ΔX) due to buckling of the strain conversion unit, instead of directly detecting the pressure applied from the pressurizer, so that the processing pressure of the pressurizer is applied to the buckling detection unit. It is no longer necessary to select a buckling detection unit that can withstand the machining pressure. It enables detection of machining pressure without receiving the machining pressure of the pressurizer.

The front view which shows the installation state of the pressure detection apparatus of 1st Embodiment. (A) A partially enlarged front view showing the pressure detection device of the first embodiment, (b) a side view seen from the right side when FIG. 2 (a) is a front view. The figure which shows the displacement detection part and the pressurization member in the buckling detection part of the pressure detection device of 1st Embodiment. (A) A diagram illustrating an initial state of a buckling detection unit of the pressure detection device of the first embodiment, and (b) a diagram illustrating distortion detection during buckling of the pressure detection device of the first embodiment. It is a figure explaining the state when the pressure detection apparatus of 1st Embodiment is attached and the pressure processing is performed. (A) A diagram illustrating a state of a strain conversion unit during pressing according to the first embodiment, and (b) a diagram illustrating a state in which the strain in FIG. 5 is transmitted from the strain conversion unit to the buckling detection unit. (A) A diagram illustrating another state of the strain conversion unit during pressing according to the first embodiment, and (b) a diagram illustrating a state in which the strain in FIG. 6 (a) is transmitted from the strain conversion unit to the buckling detection unit. .. The figure which shows the detection example of the processing pressure at the time of using the pressure detection apparatus of 1st Embodiment. The figure which shows the pressure detection apparatus of 2nd Embodiment. It is a figure which shows the pressure detection apparatus of 2nd Embodiment, and is the AA sectional view of FIG. It is a figure which shows the mode which is the pressure detection apparatus of 3rd Embodiment, and is provided with a set of a strain conversion part and a processing head adjacent to each other in one fixed support member. It is a figure which shows the pressure detection apparatus of 3rd Embodiment, and is the cross-sectional view of AA of FIG. The figure which shows the structure of the buckling detection part which provided the pressurization member and the holding member in the buckling detection part of 4th Embodiment. The figure which shows the structure which the heat flow sensor and the set of elastic members of the displacement detection part in the buckling detection part of 5th Embodiment are laminated in two stages.

An embodiment of the present invention will be described with reference to the drawings. In each embodiment, substantially the same configuration is designated by the same reference numeral, and the description thereof will be omitted.

(First Embodiment)
As shown in FIGS. 1 to 4, the pressure detection device 30 of the present embodiment is mounted on the pressurizing machine 1 as a press-fitting pin extraction device. The pressurizing machine 1 applies pressure to the work 2 placed on the upper surface 14 of the pedestal 3 in the Y-axis direction perpendicular to the upper surface 14 for processing.
The pressure detecting device 30 for detecting the machining pressure by the pressurizing machine 1 is provided at a position eccentric from the axial core line 15 of the strain converting unit 33, and a buckling phenomenon of the strain converting unit 33 receiving the pressure of the pressurizing machine 1 occurs. Detects the amount of strain fluctuation in the axial direction.

As shown in FIG. 1, the pressurizing machine 1 before the start of work can move up and down in the Y-axis direction guided by the guide rod 4 rising from the upper surface 14 of the pedestal 3 on which the work 2 can be placed and the guide rod 4. It includes a movable plate 5, a ball nut 6 and a ball screw 7 for moving the movable plate 5 up and down, and a motor 8 for rotating the ball screw 7. The pressure detection device 30 equipped with the processing head 9 is fixed to the lower surface of the movable plate 5.

As shown in FIG. 1, the pressure detection device 30 is arranged at an intermediate position between the movable plate 5 and the pedestal 3 on the Y axis. The pressure detection device 30 includes a main body 31 having a fixed support member 32 and a strain conversion unit 33, and a buckling detection unit 40.

The upper part of the main body 31 has a fixed support member 32. The fixed support member 32 is fixed to the lower surface of the movable plate 5. The lower part of the main body 31 has a strain conversion unit 33. The fixed support member 32 is a plate body that receives the processing pressure from the pressurizing machine 1. The fixed support member 32 is screwed to the movable plate 5 at a position orthogonal to the Y axis. The fixed support member 32 can mount the processing head 9 at the lowermost end of the strain conversion unit 33.

The strain conversion unit 33 is a plate body fixed to the lower surface of the fixed support member 32 between the processing head 9 and the processing head 9. As shown in FIGS. 2A and 2B, the upper surface 16 of the strain conversion unit 33 intersects the Y-axis and is fixed so that the thickness direction is the X-axis direction perpendicular to the Y-axis. The plate body forming the strain conversion unit 33 is made of a super steel material. It is a plate material whose height (H) and depth (D) are about 10 times larger than the thickness (W). A flat plate having dimensions of H> D> W. When receiving a reaction from the machining head 9, the parallelism of the mounting surface of the machining head 9 with respect to the mounting surface of the fixed support member 32 is set so as to be within a range that does not affect the machining. For example, in order for the parallelism to be 0.05 or less when the load is 10 kgf, the strain conversion unit 33 is made of super steel, W is 8 mm, D is 80 mm, and H is 100 mm.

As shown in FIGS. 2A and 2B, the buckling detection unit 40 is arranged at a position eccentric from the axial core line 15 of the strain conversion unit 33. This is to prevent the pressure applied by the pressurizing machine 1 to the movable plate 5 from being applied to the buckling detection unit 40. The buckling detection unit 40 can detect the amount of strain fluctuation propagating in the X-axis direction from the strain conversion unit 33 and convert it into an electric signal. The buckling detection unit 40 includes a displacement detection unit 41, a lever 50, a holding member 56, and a pressurization member 37.

As shown in FIG. 3, the displacement detection unit 41 is a laminate of an elastic member 42 capable of converting displacement due to strain into heat and a heat flow sensor 43 capable of converting the heat flow generated by the elastic member 42 into an electric signal. The elastic member 42 is made of a resin, rubber, or metal made of ultra-high molecular weight polyethylene capable of generating heat by a thermoelastic effect, or a combination thereof. The heat flow sensor 43 is a voltage type sensor that generates a thermoelectromotive force by the Zeebeck effect when the heat flow passes in the thickness direction. The displacement detection unit 41 is a laminated body in which a heat flow sensor 43 and an elastic member 42 are laminated, and the heat flow sensor 43 detects a heat flow generated by elastic deformation of the elastic member 42.

As shown in FIG. 2A, the lever 50 is a rod or plate having a contact point 51, a bent portion 52, an acting portion 53, and a fulcrum 54 in order in the axial direction. According to the principle of the lever, the lever 50 amplifies the fine movement (strain fluctuation amount) of the contact point 51 by the acting unit 53 to obtain a displacement.

The lever 50 is bent 90 degrees at the bent portion 52. Assuming that the surface forming the outer angle of the bent portion 52 is the lever outer surface 55, the contact point 51 and the fulcrum 54 are located at the respective ends of the lever outer surface 55 and have a ridge line that intersects the axis of the lever 50. .. The ridgeline of the contact point 51 contacts the strain conversion unit 33 from the X-axis direction. Similarly, the ridgeline of the fulcrum 54 contacts the lower surface of the fixed support member 32 from the Y-axis direction. The lower surface of the fixed support member 32 is an end surface of the fixed support member 32 on the strain conversion portion 33 side. The acting unit 53 is a portion on the lever 50 with which the displacement detecting unit 41 comes into contact. The acting portion 53 is a portion where the displacement amplified by the lever 50 is applied to the elastic member 42 as the amount of change in compression.

The pressing member 56 is a plate body that presses the displacement detecting portion 41 against the acting portion 53 of the lever 50 by the pressurizing member 37. Assuming that the surface forming the inner angle of the bent portion 52 is the inner side surface 57 of the lever, the restraining member 56 presses the displacement detecting portion 41 against the inner side surface 57 of the lever.

As shown in FIG. 3, the pressurizing member 37 is a bolt that presses the elastic member 42 so that the displacement is applied to the elastic member 42 from the acting portion 53 and the heat flow from the elastic member 42 is transmitted to the heat flow sensor 43. The displacement of the acting portion 53 changes the amount of compression of the elastic member 42. The pressurization member 37 is a single bolt that fastens the holding member 56, the displacement detection portion 41, and the lever 50 together to the fixed support member 32 at the acting portion 53. The pressurization member 37 penetrates the central portion of the holding member 56 and the displacement detection portion 41 and the lever 50, and is fastened to the fixed support member 32.

When the pressurization member 37 is fastened, the buckling detection unit 40 causes the following operations (1)-(3) in the initial state as shown in FIG. 4 (a).
(1) The elastic member 42 is displaced in the fastening direction (Y-axis direction, arrow a) of the pressurizing member 37. The elastic member 42 is compressed within the movable range of the lever 50.
(2) The contact point 51 of the lever 50 receives a repulsive force from the strain conversion unit 33 in the X-axis direction (arrow b).
(3) The fulcrum 54 of the lever 50 receives a repulsive force in the Y-axis direction (arrow c) from the fixed support member 32.

Next, the relationship between the contact point 51, the fulcrum 54, and the compression amount of the elastic member 42 under the initial state will be described. When the amount of strain fluctuation due to buckling of the strain conversion unit 33 at the contact point 51 is ΔX, the lever 50 rotates about the fulcrum 54. At that time, as shown in FIG. 4B, the amount of compression of the elastic member 42 changes due to the displacement from the lever 50. Let ΔY be the amount of change in compression of the elastic member 42. In the initial state, the holding member 56, the displacement detection unit 41, and the lever 50 are co-tightened to the fixed support member 32 so that the elastic member 42 is compressed at least in the movable range of the lever 50, so that the strain fluctuates. The amount of change in compression ΔY corresponding to the amount ΔX can be displaced in either an increase or a decrease.
(1) ΔY increases as the horizontal length L of the lever 50 becomes longer.
(2) ΔY becomes smaller as the vertical length V of the lever 50 becomes longer.
(3) ΔY increases as the distance P from the fulcrum 54 to the pressurizing member 37 (center of the bolt) increases.

However, when ΔY becomes large, the force transmitted to the elastic member 42 becomes small, and conversely, when ΔY becomes small, the force becomes large. Since the heat generation and endothermic heat of the elastic member 42 are proportional to the deformation speed and the force, when the speed of the drawing process is slow, the force transmitted to the elastic member 42 is set to be large. When the pulling force is small, ΔY becomes large. In other words, the deformation speed is increased. Specifically, the dimensions of the lever 50 and the position from the fulcrum 54 to the pressurizing member 37 are adjusted according to the conditions of the process. Under such a relationship, when the amount of compression applied to the elastic member 42 decreases, an endothermic flow is generated in the elastic member 42. When the amount of compression applied to the elastic member 42 increases, an endothermic flow is generated in the elastic member 42.

Next, the operation of the pressure detection device 30 will be described.

As shown in FIG. 1, the pressurizing machine 1 performs a step of pulling out the press-fitting pin 10 inserted in the work 2. As an initial state, the work 2 is placed on the upper surface 14 of the pedestal 3. A press-fit pin 10 is press-fitted into the center of the work 2.

(1) When the motor 8 operates, the ball screw 7 rotates as shown in FIG. The rotation of the ball screw 7 lowers the movable plate 5 on the ball nut 6 side. The pressure detection device 30 descends together with the movable plate 5, and the tip of the machining head 9 comes into contact with the press-fit pin 10 of the work 2 and further pushes it down. When the pressurizing machine 1 is continuously operated, the press-fitting pin 10 is pulled out from the work 2 downward.

(2) In the step of pulling out the press-fitting pin 10 downward from the work 2, as shown in FIG. 6A, the strain conversion unit 33 receives the pressure (arrow d) in the Y-axis direction from the pressurizing machine 1 and the work 2 from the work 2. Receives reaction force (arrow e). Since a force is applied to the strain conversion unit 33 from both upper and lower ends, the strain conversion unit 33 buckles, and the central portion in the second axial direction swells to one side. The strain caused by the buckling of the strain conversion unit 33 is generated in the X-axis direction (arrow f direction) of FIG. 6A, which is the plane side of the strain conversion unit 33. As shown in FIG. 4B, the strain in the X-axis direction becomes a strain fluctuation amount (ΔX) and is transmitted to the contact point 51.

(3-1) The contact point 51 of the lever 50 has weak contact with the strain conversion unit 33 (direction of arrow b in FIG. 4A), and as shown by arrow g in FIG. 6B, the contact point 51 is centered on the fulcrum 54. The lever 50 slightly moves in the direction of rotation. The fine movement in the arrow g direction is amplified by the action unit 53 and becomes a displacement in the arrow h direction (Y-axis direction). The displacement in the direction of arrow h reduces the initial displacement applied to the elastic member 42. That is, the lever 50 reduces the amount of compression of the elastic member 42 at the acting portion 53 by the amount of strain fluctuation in the direction of the arrow f. When the amount of compression applied to the elastic member 42 decreases, an endothermic flow is generated in the elastic member 42 according to the amount of change in compression (ΔY).

(3-2) Further, when the strain conversion unit 33 is distorted in the arrow k direction (direction opposite to the arrow f direction) as shown in FIG. 7A, the contact point 51 of the lever 50 is the strain conversion unit 33. The contact with the lever 50 (direction of arrow b in FIG. 4A) becomes stronger, and as shown by arrow m in FIG. 7B, the lever 50 slightly moves in the direction of rotation around the fulcrum 54. The fine movement in the direction of the arrow m is amplified by the action unit 53 and becomes a displacement in the direction of the arrow n (Y-axis direction). The displacement in the n direction of the arrow increases the pressure applied to the elastic member 42. That is, the amount of compression applied to the elastic member 42 by the lever 50 at the acting portion 53 is increased by the amount of strain fluctuation in the arrow k direction. When the amount of compression applied to the elastic member 42 increases, heat is generated from the elastic member 42 according to the amount of change in compression (ΔY).

(4) Since the heat generated by the elastic member 42 generates a heat flow that passes through the heat flow sensor 43, it is possible to extract an electric signal that changes in time series from the heat flow sensor 43. By applying a predetermined amount of compression in advance within the movable range of the lever 50 by the pressurizing member 37, the strain conversion unit 33 is elastic regardless of whether the strain is generated in the arrow f direction or the arrow k direction. A change occurs in the displacement applied to the member 42. Since the displacement applied to the elastic member 42 changes the amount of compression, a heat flow is generated, and the heat flow sensor 43 can output the change in the heat flow as an electric signal.

FIG. 8 shows an example of the detection result using the pressure detection device of the first embodiment.

As shown by the broken line R in FIG. 8, the strain due to buckling in the normal pin pulling operation is recorded in advance as a time-series standard electric signal waveform. The electric signal waveform is detected for each pin removal operation. By comparing the detected electric signal waveform and the standard electric signal waveform, the quality of the work after the pin punching process is judged. In the pressure detection device 30 of the present embodiment, the determination can be made by the combination of the peak height and the time during the pressurization work using the electric signal waveform. For example, when the peak P1 and the peak P2 are observed as shown by the solid line S when the pin removal operation is performed, it can be compared with the peak Pr observed by the waveform shown by the broken line R. By comparing the peak height and the observed time in combination, it is possible to determine the abnormality in the process. In the configuration of the present embodiment, the peak P1 can be detected as a spike-shaped waveform, and the accuracy of the pass / fail judgment is improved.

As shown in FIGS. 2 (a) and 2 (b), the buckling detection unit 40 is arranged outside the axis 15 of the strain conversion unit 33, so that it can receive the processing pressure of the pressurizing machine 1. It is possible to detect the machining pressure. It is not necessary to select the buckling detection unit 40 that can withstand the machining pressure.

The lever 50 is a rod or plate bent by the bent portion 52. A contact point 51 that contacts the strain conversion unit 33 from the X-axis direction at one end and the other end of the lever outer surface 55, and the other end that sandwiches the bending portion 52 is the strain conversion portion 33 of the fixed support member 32 from the Y-axis direction. Since the fulcrum 54 that comes into contact with the end surface on the side is provided, the pressure applied to the work 2 by the pressurizing machine 1 is not applied to the buckling detection unit 40. The buckling detection unit 40 can detect the buckling of the strain conversion unit 33 without receiving the processing pressure of the pressurizing machine 1. The pressure detection device 30 can detect the machining pressure by the pressurizing machine 1 by detecting the buckling of the strain conversion unit 33, and can easily determine the quality of machining of the work 2.

(Second Embodiment)
As shown in FIGS. 9 and 10, the pressure detection device 70 of the second embodiment is different from that of the first embodiment in the shape and arrangement of the lever 72 included in the buckling detection unit 100. The pressure detection device 70 can be arranged at an intermediate position between the movable plate 5 and the pedestal 3 in the Y-axis direction in which the machining pressure is applied to the work 2.

As shown in FIG. 10, the pressure detection device 70 includes a main body 71 having a fixed support member 73 and a strain conversion unit 74, and a buckling detection unit 100. The upper portion of the main body 71 has a fixed support member 73 and can be fixed to the lower surface of the movable plate 5. The lower part of the main body 71 has a strain conversion unit 74, and the processing head 9 can be mounted on the Y axis. The fixed support member 73 is a plate body that receives the processing pressure from the pressurizing machine 1. It is screwed to the movable plate 5 at a position orthogonal to the Y axis.

The buckling detection unit 100 includes a displacement detection unit 84, a lever 72, a holding member 83, and a pressurization member 82.

The displacement detection unit 84 has an elastic member 85 and a heat flow sensor 86.
As shown in FIG. 10, the lever 72 of the buckling detection unit 100 is a rod or a plate body having a contact point 76, a bending portion 77, an action portion 78, and a fulcrum 79 in order in the axial direction.

The lever 72 is bent 90 degrees at the bent portion 77. Assuming that the surface forming the inner angle of the bent portion 77 is the inner side surface 81 of the lever, the contact point 76 and the fulcrum 79 have a ridge line that intersects the axis of the lever 72 at each end of the inner side surface 81 of the lever. The ridgeline of the contact point 76 contacts the strain conversion unit 74 from the X-axis direction where buckling occurs so that the pressure of the pressurizing machine 1 is not applied. Similarly, the ridge line of the fulcrum 79 contacts the upper surface side of the fixed support member 73 from the Y-axis direction. The upper surface side of the fixed support member 73 is a surface of the fixed support member 73 opposite to the strain conversion portion 74.

Further, in order to prevent the pressure of the pressurizing machine 1 from being applied to the buckling detection unit 100, a recess 87 is provided on the upper surface side of the fixed support member 73, and the fulcrum 79 of the lever 72 and the action portion 78 are provided in the recess 87. , The displacement detection unit 84, the holding member 83, and the pressurizing member 82 are accommodated. The acting portion 78 is a portion on the lever 72 with which the displacement detecting portion 75 comes into contact. The acting portion 78 is a portion where the displacement amplified by the lever 72 is applied to the elastic member 85 as the amount of change in compression.

The pressing member 83 is a plate body that presses the displacement detecting portion 84 against the acting portion 78 of the lever 72 by the pressurizing member 82. Assuming that the surface forming the outer angle of the bent portion 77 is the lever outer surface 88, the holding member 83 holds the displacement detection portion 84 on the lever outer surface 88.

The pressurizing member 82 is a bolt that presses the lever 72 so that the displacement of the lever 72 is applied to the elastic member 85 and the heat flow from the elastic member 85 is transmitted to the heat flow sensor 86. It is a single bolt that fastens the holding member 83, the displacement detection unit 84, and the lever 72 together to the fixed support member 73 at the working portion 78. The pressurization member 82 penetrates the central portion of the holding member 83 and the displacement detection portion 84 and the lever 72, and is fastened to the fixed support member 73.

When the pressurization member 82 is fastened, the initial state of the buckling detection unit 80 causes the following operations (1)-(3).
(1) The contact point 76 of the lever 72 receives a repulsive force from the strain conversion unit 74 in the X-axis direction.
(2) The fulcrum 79 of the lever 72 receives a repulsive force in the Y-axis direction from the fixed support member 73.
(3) The elastic member 85 is displaced in the fastening direction of the pressurizing member 82. The elastic member 85 is compressed within the movable range of the lever 72.

Similar to the first embodiment, when the pressurizing machine 1 performs the step of pulling out the pin inserted into the work 2, strain due to buckling occurs in the strain conversion unit 74. Since the strain conversion unit 74 is a plate body and the upper surface 17 of the strain conversion unit 74 intersects the Y axis and is fixed so that the thickness direction is the X-axis direction, X is the plane side of the strain conversion unit 74. Axial distortion occurs. The strain propagates to the contact point 76 as a strain fluctuation amount (ΔX).

The strain fluctuation amount (ΔX) received by the contact point 76 is amplified through the detection lever 72 main body and propagated to the acting unit 78. As a result, the acting portion 78 applies a displacement to the elastic member 85. When the displacement applied to the elastic member 85 becomes smaller, the amount of compression of the elastic member 85 decreases, and an endothermic flow to the elastic member 85 occurs. Further, when the displacement applied to the elastic member 85 becomes large, the amount of compression of the elastic member 85 increases, and a flow of heat is generated from the elastic member 85. That is, the amount of change in compression (ΔY) causes a change in the heat flow received by the heat flow sensor 86, and the displacement detection unit 84 can take out an electric signal that changes in time series.

As shown in FIGS. 9 and 12, a recess 87 is provided on the upper surface side of the fixed support member 73. Since the buckling detection unit 100 accommodates the fulcrum 79 and the action unit 78 of the lever 72, the displacement detection unit 84, the holding member 83, and the pressurization member 82 in the recess 87, the displacement detection unit 84 is a pressurizing machine. It is possible to detect the machining pressure without receiving the machining pressure of 1.

The lever 72 is a rod or plate bent by the bent portion 77. A contact point 76 where one end of the inner side surface 81 of the lever can contact the strain conversion portion 74 from the X-axis direction, and the other end of the bent portion 77 sandwiching the bent portion 77 of the fixed support member 73 from the Y-axis direction where machining pressure is applied to the work 2. Since the fulcrum 79 in contact with the surface opposite to the strain conversion portion and the recess 87 in which the fulcrum 79 and the displacement detection portion 84 can be embedded on the side opposite to the strain conversion portion 74 of the fixed support member 73 are provided. The pressure applied to the work 2 by the pressurizing machine 1 is not applied to the buckling detection unit 100 provided in the pressure detecting device 70. The buckling detection unit 100 can detect the buckling of the strain conversion unit 74 without receiving the processing pressure of the pressurizing machine 1.

(Third Embodiment)
The third embodiment will be described with reference to FIGS. 11 and 12. When processing the same large number of workpieces from one material, as shown in FIGS. 11 and 12, it is assumed that one fixed support member 73 is provided with a large number of strain conversion units 74 and a set of processing heads 9 adjacent to each other. To. In addition to the pressure detection device 70 of the second embodiment, the pressure detection device 90 having the same configuration is provided. The strain conversion unit 94 is the same as the strain conversion unit 74. Further, the buckling detection unit 110 has the same configuration as the buckling detection unit 100. In addition, the configuration of the pressure detection device 90 is the same as that of the pressure detection device 70.

Since the buckling detection unit 100 and the buckling detection unit 110 are fixed from the upper surface side of the fixed support member 73, respectively, pressure is applied to the strain conversion units 74 and 94 arranged in a comb shape as shown in FIGS. 10 and 13. The detection device 70 and the pressure detection device 90 can be fixed from the upper surface side of the fixed support member 73.

As described above, the buckling detection units 40, 60, 80, 100, 110 of the first embodiment, the second embodiment, and the third embodiment are the displacement detection units 41, 45, 63, 84 and the levers 50, 61, 72. The holding members 56, 62, 67, 83 and the pressurizing members 37, 38, 39, 82 are provided. The displacement detection units 41, 63, 84 detect the displacement generated according to the strain fluctuation amount of the strain conversion units 33, 74. The levers 50, 61, 72 come into contact with the strain conversion portions 33, 74 from the X-axis direction where buckling occurs, and from the Y-axis direction in which the machining pressure is applied to the work 2 to the fixed support members 32, 73. It has fulcrums 54, 79 that come into contact with each other, and action units 53, 78 that can propagate the strain fluctuation amount to one surface of the displacement detection units 41, 45, 63, 84. The levers 50, 61, 72 are movable around the fulcrum 54, 79 so as to amplify the strain fluctuation amount of the strain conversion units 33, 74 and convert it into the displacement of the action units 53, 78. The holding members 56, 62, 67, 83 are in contact with the other surface of the displacement detection units 41, 45, 63, 84. The pressurizing members 37, 38, 39, 82 are displaced with the restraining members 56, 62, 67, 83 so that the displacement detecting portions 41, 63, 84 are at least compressed in the movable range of the levers 50, 61, 72. The portions 41, 63, 84 and the levers 50, 72 are fastened together to the fixed support members 32, 73. As a result, the pressure applied to the work 2 by the pressurizing machine 1 is not applied to the buckling detection units 40, 60, 80, 100, 110 provided in the pressure detection devices 30, 70, 90. Further, the buckling detection units 40, 60, 80, 100, 110 detect the buckling of the strain conversion units 33, 74, 96 at the contact points 51, 76, and the levers 50, 72 are amplified by the action units 53, 78. can do. Displacement detection units 41, 63, 84, 94 can detect strain due to buckling and easily determine whether the work 2 is machined by the pressurizing machine 1.

Further, the displacement detecting units 41, 45, 63, 84 are the elastic members 42, 46, 85, and the elastic members 42, 46, which can convert the displacement of the acting units 53, 78 into a heat flow as the amount of change in compression (ΔY). It is a laminated body of heat flow sensors 43, 47, 86 capable of converting the heat flow generated by 85 into an electric signal. As a result, the buckling detection units 40, 60, 80, 100, 110 use the buckling of the strain conversion units 33, 74, 96 as the amount of change in compression of the elastic members 42, 46, 85, and the heat flow sensor 43, At 47 and 86, it can be detected by the heat flow accompanying the amount of change in compression. The buckling of the strain conversion units 33, 74, 94 makes it easy to determine whether the work 2 is processed by the pressurizing machine 1.

(Fourth Embodiment)
The fourth embodiment will be described with reference to FIG.

A configuration including the pressurizing members 38 and 39 will be described. In the pressure detection device 30 of the first embodiment, one bolt is used as the pressurization member 37, but two bolts may be used as the pressurization members 38 and 39.

The buckling detection unit 60 can sandwich the displacement detection unit 63 between the restraining member 62 and the lever 61 by using two bolts as the pressurizing members 38 and 39 at positions crossing the lever 61. The displacement detection unit 63 is a laminate of an elastic member 65 capable of converting displacement due to strain into a heat flow and a heat flow sensor 66 capable of converting the heat flow generated by the elastic member 65 into an electric signal. When the pressurizing members 38 and 39 are used, the displacement detection unit 63 does not need to make a hole for passing a bolt, and can be formed into a rectangular shape without a hole. The degree of freedom in shape and mounting is increased.

(Fifth Embodiment)
The fifth embodiment will be described with reference to FIG.

A configuration including the displacement detection unit 45 will be described. In the pressure detection device 30 of the first embodiment, the displacement detection unit 41 is composed of a laminated body of the elastic member 42 and the heat flow sensor 43, as shown in FIG. On the other hand, as shown in FIG. 14, in the buckling detection unit 80, the displacement detection unit 45 has the elastic member 46 and the heat flow sensor 47, and the heat flow sensor 43 and the elastic member 42 in this order from the holding member 67. It has a structure in which it is laminated so as to form a step. The elastic member 46 is the same as the elastic member 42. Further, the heat flow sensor 47 is the same as the heat flow sensor 43. In this way, the inflow and outflow of heat flow from both sides of the displacement detection unit 45 can be detected, and the characteristics of strain due to buckling can be detected in more detail as compared with the case of stacking in one stage.

(Other embodiments)
In the embodiment (a), the configuration in which the ridgeline of the contact point is in contact with the strain conversion portion and the ridgeline of the fulcrum is in contact with the fixed support member has been described. .. When the sensitivity is high, the point contact is good, and when the stability of measurement is important, the contact by the ridge line is good. Further, one of them may be configured as a point contact.

(B) In the case where a large number of sets of strain conversion portions and processing heads are provided adjacent to one fixed support member, an example in which two sets are provided has been described in the embodiment, but the present invention is not limited thereto. The number of sets can be increased as needed.

(C) In the pressure detection device of the present invention, the displacement detection unit has a configuration in which an elastic member capable of converting displacement due to strain into heat and a heat flow sensor capable of converting the amount of heat generated by the elastic member into an electric signal are laminated. , Not limited to this. The displacement detection unit may have a load cell or a magnet scale (registered trademark).

(D) The range of use of the pressure detection device is not limited to the process of extracting the press-fitting pin by the pressurizing machine. It can be used in a pressurizing process as appropriate, such as in a process of punching out carbon material.

(E) In the first embodiment, the plate body forming the strain conversion unit 33 is made of a super steel material. The material of the strain conversion unit of the present invention is not limited to the super steel material. The shape of the strain conversion unit may be not a plate body or a rod body, and the shape is not limited to the embodiment.

(F) The strain conversion portion in the first embodiment is a plate material having a height (H) and a depth (D) about 10 times larger than the thickness (W). The lengths of the height (H) and the depth (D) with respect to W) are not limited to this magnification.

(G) Further, although specific dimensions of the thickness (W), the height (H), and the depth (D) have been presented and described, the present invention is not limited to these dimensions. The thickness (W) may be set so as to cause displacement in the plane including the height (H) and the depth (D) at the point of causing buckling.

(H) The parallelism of the mounting surface of the machining head to the mounting surface of the fixed support member is shown numerically, but the parallelism is not limited to this as long as the machining accuracy can be ensured.

(I) In the first embodiment, the elastic member 42 uses a material made of ultrapolymer polyethylene capable of generating heat by the thermoelastic effect, but the elastic member of the present invention generates heat by the thermoelastic effect. Any material that can be generated may be used.

The present invention is not limited to the embodiments, and can be implemented in various embodiments without departing from the spirit of the invention.

1 ... Pressurizer, 2 ... Work,
3 ... pedestal, 5 ... movable plate,
9 ... Processing head, 15 ... Axis core line,
30, 70, 90 ... Pressure detector,
31,71 ... Main body,
32,73 ... Fixed support member, 33,74,94 ... Strain conversion unit,
40, 60, 80, 100, 110 ... Buckling detection unit.

Claims (5)

It is a pressure detection device (30, 70, 90) that detects the processing pressure applied to the work by pressing the processing head (9) of the pressurizing machine (1) against the work (2) placed on the pedestal (3). hand,
A fixed support member (32, 73) fixed to the movable plate (5) of the pressurizing machine and receiving the driving force of the pressurizing machine, and
A processing head that can contact the work and apply processing pressure,
A strain conversion unit (33,74,94) fixed between the fixed support member and the machining head and causing strain due to buckling in response to the machining pressure.
A buckling detection unit (40, 60, 80, 100, 110) capable of detecting the strain fluctuation amount (ΔX) due to buckling of the strain conversion unit at a position eccentric from the axial center line (15) of the strain conversion unit. When,
A pressure detector equipped with. The buckling detection unit is
A displacement detection unit (41, 45, 63, 84) that detects the displacement generated according to the strain fluctuation amount, and
A contact point (51,76) that contacts the strain conversion portion from the X-axis direction where buckling occurs, a fulcrum (54,79) that contacts the fixed support member from the Y-axis direction that applies machining pressure to the work, and It has an action unit (53,78) capable of propagating the strain to one surface of the displacement detection unit, and is movable around the fulcrum so as to amplify the strain fluctuation amount and convert it into the displacement of the action unit. Lever (50, 61, 72) and
A holding member (56, 62, 67, 83) in contact with the other surface of the displacement detection unit, and
Pressurized members (37, 38, 39, 82) that fasten the holding member, the displacement detecting portion, and the lever together to the fixed support member so that the displacement detecting portion is at least compressed in the movable range of the lever. )When,
The pressure detection device according to claim 1. The displacement detection unit (41, 45, 63, 84) is
An elastic member (42, 46, 85) capable of converting the displacement of the acting portion into a heat flow as a change in compression (ΔY), and a heat flow sensor (43, 47,) capable of converting the heat flow generated by the elastic member into an electric signal. The pressure detection device according to claim 2, which is a laminated body of 86). The levers (50, 61) are
A rod or plate bent at the bent portion (52).
At the contact point (51), one end of the lever outer surface (55) of the lever comes into contact with the strain conversion unit (33) from the X-axis direction.
The pressure detection device according to claim 2 or 3, wherein the fulcrum (54) has the other end of the bent portion in contact with the end surface of the fixed support member (32) on the strain conversion portion side from the Y-axis direction. .. The lever (72) is
A rod or plate bent at the bent portion (77).
At the contact point (76), one end of the lever inner surface (81) of the lever comes into contact with the strain conversion unit (74,94) from the X-axis direction.
At the fulcrum (79), the other end of the bent portion is in contact with the surface of the fixed support member (73) opposite to the strain conversion portion from the Y-axis direction.
The pressure detection device according to claim 2 or 3, wherein a recess (87) capable of accommodating the fulcrum and the displacement detection portion is formed on the side of the fixed support member opposite to the strain conversion portion.

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