JP2018099697A - Inspection device for heading machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device for a heading machine which is provided on the heading machine for manufacturing a product having a through-hole and can automatically inspect the presence or absence of a foreign matter capable of remaining on an inner part of the through-hole.SOLUTION: An inspection device 1 for a heading machine which is provided on a multi-process heading machine 9 for manufacturing a product 85 having a through-hole 86 by subjecting a work-piece 81 to hole formation processing with a use of a punch 96 and a dice 93 and inspects the presence or absence of a foreign matter (a piercing 83, a forming object part 82) capable of remaining on an inner part of the through-hole 86 includes: a detection pin 2 which has a tip shape applying to the through-hole 86 and a shape of the foreign matter and is inserted to the through-hole 86 from one side of the product 85; a driving part 3 which drives insertion and retreat of the detection pin 2 to and from the through-hole 86; and a foreign matter detection part 4 for detecting that the detection pin 2 inserted to the through-hole 86 pushes and moves the foreign matter or is brought into contact with the foreign matter.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an inspection apparatus for a forging machine that inspects for the presence or absence of foreign matter or the like that may remain inside a through hole when a product having a through hole is manufactured by the forging machine.

  2. Description of the Related Art A multi-process forging machine that has a plurality of forging process parts that press a workpiece with a punch and a die and performs a forming process is known. In a multi-process forging machine, a workpiece is transferred from an upstream side to a downstream side by a transfer device in order to proceed with a forming process. Here, a product having a through hole may be manufactured by subjecting the workpiece to a hole forming process. In this case, the problem that the pierce residue generated by the hole forming process remains in the through hole may occur very rarely. An example of a technique for inspecting the presence or absence of a foreign substance in a hole of a product is disclosed in Patent Document 1.

  According to the method for inspecting a cast hole disclosed in Patent Document 1, an inspection rod that can slide in the axial direction is mounted on a movable die of a trimming press, and the tip of the inspection rod is cast into a cast product while performing the trimming by moving the movable die. Insert into the hole. And it is test | inspected from the displacement amount of a test | inspection bar | burr whether a foreign material exists in the inside of a cast hole. According to this, since it is possible to detect a defective product at a stage before the cast product is completed as a product, it is possible to minimize loss.

JP-A-10-328806

  By the way, if the pierce remains in the through hole of the product, there is a risk of a secondary disaster in which a heat treatment machine or an assembly machine in a later process using the product breaks down. Furthermore, there is a possibility that a machine incorporating this product becomes a defective product, resulting in a large loss. For this reason, in the past, inspection has been conducted for the presence of foreign matter or the like that can remain inside the through hole for all products, relying on human naval tactics. However, 100% inspection by human naval tactics was extremely inefficient. Further, the forging machine generally manufactures 100 or more products per minute at high speed, and automation of inspection has not been realized.

  With respect to this problem, the technique of Patent Document 1 cannot be used due to the following two problems. 1stly, since the technique of patent document 1 is combined with the trimming after a casting process, it cannot implement | achieve the high-speed test | inspection corresponding to the high-speed manufacture of a forging machine. 2ndly, the technique of patent document 1 is aimed at the baghole-shaped cast hole, and cannot be applied to a through-hole. Therefore, there is a need for an inspection apparatus for a forging machine that can automatically and at high speed inspect for the presence of piercings that can remain inside the through-hole of a product.

  Further, in the forging machine, there is a possibility that the workpiece is transported without performing hole forming, and there is a possibility that burrs are generated inside the through hole. For this reason, it is preferable that the forging machine inspection apparatus has a function of detecting an unprocessed workpiece and a function of inspecting the presence or absence of burrs in addition to the function of inspecting the presence or absence of pierce.

  The present invention has been made in view of the above problems of the background art, and is provided in a forging machine for manufacturing a product having a through hole, and can be automatically inspected for the presence or absence of a foreign substance that can remain inside the through hole. Providing an inspection apparatus is a problem to be solved.

  The inspection apparatus for a forging machine according to the present invention is provided in a forging machine that manufactures a product having a through hole by subjecting a workpiece to a hole forming process using a punch and a die. A forging machine inspection device for inspecting presence or absence, having a tip shape that matches the shape of the through hole and the foreign matter, and a detection pin inserted into the through hole from one side of the product, and the detection pin A drive unit that drives insertion and withdrawal of the through hole, and a foreign object detection unit that detects that the detection pin inserted into the through hole pushes the foreign object or comes into contact with the foreign object. Prepare.

  Further, the foreign object detection unit is held on the other side of the product and is moved by the foreign object to be pushed and moved in the insertion direction of the detection pin, or a detection plate that contacts the pushed foreign substance In addition, it may include a detection unit that detects movement of the detection plate or contact between the detection plate and the foreign object.

  Further, when the metal detection plate is pushed by the pushed foreign matter and moves in the insertion direction of the detection pin, the metal detection plate comes into contact with the standby conductor, and the other side detection unit includes the detection plate and the standby conductor. It is preferable to detect an electrical continuity state.

  The foreign object detection unit may be a continuity detection unit that detects that the metal detection pin is in electrical contact with the metal foreign object.

  In addition, it may further include a stroke detection unit that monitors the movement stroke amount of the detection pin and detects a shortage of the movement stroke amount caused by the foreign matter.

  In addition, it is preferable that the apparatus further includes a product conveyance unit that carries in the product from the forging process unit configured by the punch and the die and carries out the product after the inspection.

  The driving unit includes a swing arm having a fulcrum supported so as to be swingable, a drive point, and an action point for driving the detection pin, and swinging the swing arm by applying a driving force to the drive point. A drive source that moves the drive source, and a drive control unit that controls the drive source based on an execution cycle of the hole forming process, the drive side length connecting the fulcrum of the swing arm and the drive point However, it is preferable that the working side length connecting the fulcrum and the working point is larger.

  Furthermore, the swing arm may have a pair of drive points, and the drive source may be a pair of air cylinders that alternately drive the pair of drive points.

  The detection pin may be a hollow cylinder.

  Further, the foreign matter is at least pierce removed from the workpiece by the hole forming process, a molding target portion that remains bonded to the work without being subjected to the hole forming process, and at least a burr generated by the hole forming process. It is preferable to include one.

  Further, the forging machine may be a multi-step forging machine including a plurality of sets of punches and dies, and the forging machine inspection device may be provided so as to be exchangeable with any of the sets of punches and dies. .

  In the inspection apparatus for a forging machine of the present invention, a detection pin can be inserted into a through hole from one side of a product by a drive unit, and the presence or absence of a foreign material can be inspected by a foreign material detection unit. Therefore, it is possible to automatically inspect for the presence or absence of foreign matter that may remain inside the through hole.

  Furthermore, in the aspect in which the foreign matter detection unit includes the detection plate and the other side detection unit, it is possible to reliably detect the presence of foreign matter by pushing the foreign matter.

  Further, in the aspect using the standby conductor, it is possible to reliably detect the presence of foreign matter when electrical continuity between the detection plate and the standby conductor occurs.

  Further, in the aspect in which the foreign object detection unit is the continuity detection unit, it can be detected that there is a foreign object without pushing the foreign object.

  Further, in the aspect including the stroke detection unit, by combining the two detection methods, the inspection reliability of the presence or absence of foreign matters is improved, and various types of foreign matters can be detected.

  Moreover, in the aspect further provided with a product conveyance part, the conveyance of the product accompanying a test | inspection can also be automated.

  Further, in the aspect in which the drive unit includes the swing arm, the drive source, and the drive control unit, since the working side length is larger than the drive side length of the swing arm, a large amount of movement of the detection pin is caused by a small drive amount. As a result, the detection pin can be reciprocated at high speed. In addition, the detection pin can be driven based on the execution cycle of the hole forming process. Therefore, it corresponds to the high-speed production of the forging machine, and the presence or absence of foreign matters can be inspected at high speed for all products.

  Further, in the aspect in which the drive source is a pair of air cylinders, even if a shock occurs when the detection pin is inserted, the air cylinder exerts a buffering action to reduce the shock. Therefore, the product is not adversely affected and the forging machine inspection device itself does not break down. For example, even when the hole forming process is not performed and the forming object portion is carried in while being coupled to the workpiece and the detection pin collides with the forming object portion, no trouble occurs.

  Further, in the aspect in which the detection pin is formed into a hollow cylindrical shape, the detection pin can be reduced in weight, so that high-speed inspection can be performed and the drive unit can be reduced in size.

  In addition, the foreign matter can include at least one of a pierce removed by the hole forming process, a molding target portion that remains connected to the workpiece, and a burr generated by the hole forming process. Therefore, in addition to the function of inspecting for the presence of pierce, it is possible to have a function of detecting an unprocessed workpiece and a function of inspecting for the presence of burrs.

  Furthermore, in the aspect of the inspection apparatus for a forging machine provided to be exchangeable with any pair of punches and dies of the multi-step forging machine, it remains in the through hole of the workpiece on the downstream side of any desired forging process. The presence or absence of foreign matter to be obtained can be automatically inspected.

It is a top view which shows typically the whole structure of the multi-process forging machine provided with the inspection apparatus for forging machines of 1st Embodiment of this invention. It is sectional drawing which shows the shape of the product manufactured with a multi-process forging machine. It is sectional drawing which shows the shape of the workpiece | work after shaping | molding by the 4th forging process part. It is sectional drawing which shows the shape of the pierce cusp removed from the workpiece | work by the hole forming process in a 5th forging process part. It is a front view of the inspection apparatus for forging machines of 1st Embodiment. It is the figure of the foreign material detection part seen from the arrow A direction of FIG. FIG. 6 is a plan cross-sectional view of the foreign matter detection unit viewed from the direction of arrow B in FIG. 5. It is a figure which shows the structure of control of the inspection apparatus for forging machines of 1st Embodiment. It is a figure which shows the structure of control of the inspection apparatus for forging machines of 2nd Embodiment. It is a figure which shows the front-end | tip shape of the detection pin of the inspection apparatus for forging machines of 3rd Embodiment.

  First, the whole structure of the multi-process forging machine 9 which is an example of a forging machine is demonstrated. FIG. 1 is a plan view schematically showing an overall configuration of a multi-step forging machine 9 provided with a forging machine inspection apparatus 1 according to a first embodiment of the present invention. The multi-step forging machine 9 includes a plurality of sets of punches 96 and dies 93, and sequentially performs a plurality of steps of forming on the workpiece. The punch 96 moves along an axis extending in the left-right direction in FIG. The die 93 is arranged with the punch 96 and the same axis. The multi-process forging machine 9 further includes a frame 91, a die block 92, a ram 94, a punch block 95, a main drive source 97, and the like. In the first embodiment, the first to fifth forging process parts are constituted by five sets of punches 96 and dies 93. The upper side of FIG. 1 is an upstream first forging step and the lower side is a downstream fifth forging step.

  The frame 91 is a housing for disposing each part, and is made of iron and is firmly formed. The plurality of die blocks 92 are attached to the frame 91 in a replaceable manner. The plurality of dies 93 are attached to the front side (left side in the drawing) of each die block 92 in a replaceable manner. A predetermined working die is formed on the front side of each die 93 facing leftward in the drawing. The ram 94 is held so as to be capable of reciprocating in the axial direction with respect to the frame 91. The plurality of punch blocks 95 are replaceably attached to the front side (right side in the drawing) of the ram 94. The plurality of punches 96 are attached to the front side (right side in the drawing) of each punch block 95 in a replaceable manner. A predetermined working die is formed on the front side of each punch 96 facing rightward in the drawing.

  The multi-process forging machine 9 includes a cutting mechanism unit 75 having an annular movable cutter and a pusher mechanism. The movable cutter cuts a long wire inserted inside the ring shape to create a cylindrical workpiece having a predetermined dimension. The pusher mechanism pushes out the work from the movable cutter. Examples of the work material include aluminum, iron, and various alloys. The transfer device 7 is disposed from above the die block 92 to the front of the die 93. The transfer device 7 has six pairs of fingers for gripping a workpiece or a product. The first pair of fingers grips the pushed-out work and conveys it to the first forging process section. The second to fifth fourth pairs of fingers sequentially convey the workpiece formed and processed in the upstream forging process section to the downstream forging process section. The sixth pair of fingers 71 (see FIG. 5) conveys the product 85 (see FIG. 2) manufactured in the fifth forging process section to the forging machine inspection apparatus 1. The multi-process forging machine 9 includes a kickout device (not shown) and the like.

  A main drive source 97 is provided to reciprocate the ram 94. The main drive source 97 can be, for example, an induction motor or a synchronous motor that operates with a three-phase AC power source. The main drive source 97 drives the transfer device 7 and the cutting mechanism unit 75 together. The driving force of the main drive source 97 is input to the crankshaft 9A that drives the ram 94 via the flywheel 98, the disc brake 9M, and the speed reduction mechanism 99. Further, the driving force is branched and transmitted from the crankshaft 9A to the side shaft 9C via the branch gear pair 9B.

  The side shaft 9C branches and transmits the driving force upward. The driving force branched upward rotates the transfer cam 9 </ b> D, and the transfer cam 9 </ b> D drives the transfer device 7. Further, six open-close cams 9F are connected to be rotated from the side shaft 9C through the transfer drive 9E. The open close cams 9F are arranged at equal intervals in the width direction, and correspond to positions between the processes. Each of the open / close cams 9F drives the pair of fingers to open and close.

  Further, a cutter cam 9G is provided on the side shaft 9C, and a pusher cam 9H, a feed cam 9J, a feed roller 9K, and the same number of kick-out cams 9L as the dice 93 are connected. The cutter cam 9G, the pusher cam 9H, the feed cam 9J, and the feed roller 9K drive the cutting mechanism unit 75. The kickout cam 9 </ b> L drives a kickout pin (not shown) to project a molded workpiece or product from the die 93.

  Next, the shape of the product 85 and the workpiece 81 handled by the multi-step forging machine 9 will be described. FIG. 2 is a cross-sectional view showing the shape of a product 85 manufactured by the multi-step forging machine 9. FIG. 3 is a cross-sectional view showing the shape of the work 81 after being molded in the fourth forging step. FIG. 4 is a cross-sectional view showing the shape of the pierce cusp 83 removed from the workpiece 81 by the hole forming process in the fifth forging process section. As shown in FIG. 2, the product 85 has a cylindrical shape having a through-hole 86 and has an outer diameter D1, an inner diameter D2, and a height H.

  As described above, a columnar workpiece having a predetermined size is supplied from the cutting mechanism portion 75 to the first forging step. The cylindrical workpiece becomes a workpiece 81 having the shape shown in FIG. 3 by four molding processes from the first forging step to the fourth forging step. The workpiece 81 has the same outer diameter D1, inner diameter D2, and height H as the product 85, and includes a molding target portion 82 inside the through hole 86. The molding target portion 82 projects inwardly from the inner surface in the height direction of the through-hole 86 in an annular shape, and has an inner diameter D3. The workpiece 81 is formed into a product 85 by removing the molding target portion 82 by the hole forming process performed in the fifth forging process portion. The product 85 is manufactured at a high speed of about 130 pieces per minute.

  The removed molding target portion 82 becomes a pierce cusp 83. Therefore, the shape of the pierce cusp 83 shown in FIG. 4 is such that the outer diameter is approximately equal to the inner diameter D2 of the product 85, and the inner diameter is approximately equal to the inner diameter D3 of the molding target portion 82. In the fifth forging process section, the pierce casks 83 are separated from the product 85 and discharged downward. However, a problem that the pierce residue 83 remains as a foreign substance in the through-hole 86 of the product 85 may occur very rarely. This defect often occurs due to wear of the punch 96 or the die 93. The forging machine inspection device 1 according to the first embodiment is disposed on the downstream side of the fifth forging process section (see FIG. 1). The forging machine inspection apparatus 1 inspects the presence or absence of the pierce casks 83 inside the through holes 86 for all the products 85.

  The detailed description of the forging machine inspection apparatus 1 according to the first embodiment will now be described. FIG. 5 is a front view of the forging machine inspection apparatus 1 according to the first embodiment. The forging machine inspection device 1 includes a detection pin 2, a drive unit 3, a foreign matter detection unit 4, a stroke detection unit 5, and the like. FIG. 6 is a diagram of the foreign object detection unit 4 viewed from the direction of arrow A in FIG. Further, FIG. 7 is a plan sectional view of the foreign matter detection unit 4 as seen from the direction of arrow B in FIG. Moreover, FIG. 8 is a figure which shows the structure of control of the inspection apparatus 1 for forging machines of 1st Embodiment.

  In the fifth forging process section, the transfer device 7 grips the product 85 whose center line is horizontal by the pair of fingers 71 and carries it into the forging machine inspection device 1 as shown in FIG. The detection pin 2 and the drive unit 3 are arranged on one side of the loaded product 85, and the foreign object detection unit 4 is arranged on the other side of the loaded product 85. At this time, the product 85 is electrically connected to the frame 91 via the fingers 71. When the inspection to be described later is completed, the transfer device 7 opens the pair of fingers 71 and drops the product 85 onto the carry-out conveyor 72. Thereby, the product 85 is carried out of the multi-process forging machine 9. Therefore, the transfer device 7 and the carry-out conveyor 72 constitute the product transport unit of the present invention.

  The detection pin 2 includes a pin body 21 and a rear engagement portion 22. The pin main body 21 is formed in an axisymmetric hollow cylindrical shape centering on the axis AX. The pin main body 21 is reduced in weight by being formed into a hollow cylindrical shape, can move at high speed, and can be moved with a small driving force. The position of the axis AX coincides with the center line of the loaded product 85. The tip shape on the right side of the pin main body 21 in FIG. 5 is adapted to the shapes of the through hole 86, the pierce cusp 83, and the molding target portion 82. That is, the outer diameter D4 of the pin main body 21 is set smaller than the inner diameter D2 of the product 85 and larger than the inner diameter (≈inner diameter D3) of the pierce cusp 83.

  A rear engagement portion 22 is integrally provided on the rear side of the pin main body 21. The rear engagement portion 22 has a long hole 23 that is long in the vertical direction. The detection pin 2 is accommodated in a guide cylinder 24 provided on the frame 91. The detection pin 2 is movable along the axis AX within the guide cylinder 24 and is inserted into the through hole 86 of the product 85 carried on the extension line of the axis AX. Therefore, the direction from left to right in FIG. 5 is the insertion direction of the detection pin 2, and the direction from right to left is the withdrawal direction of the detection pin 2.

  The drive unit 3 includes a swing arm 31, a drive source, a drive control unit, and the like. As shown in FIG. 5 and FIG. 8, a pair of insertion side air cylinder 32 and withdrawal side air cylinder 33 and a high pressure air source 34 are provided as drive sources. An electromagnetic switching valve 35 is provided as a drive control unit, and a forging control unit 61 is also used.

  The swing arm 31 is a substantially T-shaped member. The swing arm 31 has a first drive point 311 at the top end of the first drive arm extending to the left in FIG. The swing arm 31 has a second drive point 312 at the upper end of the second drive arm extending rightward in FIG. The swing arm 31 has an action point 313 at the tip of the action arm extending downward. The action point 313 has a pin shape and is loosely fitted in the long hole 23 of the rear engagement portion 22 of the detection pin 2. The swing arm 31 has a fulcrum 314 at a key position where the two drive arms and the working arm meet. The fulcrum 314 is swingably supported by a support plate 911 erected on the frame 91. The swing arm 31 swings with the fulcrum 314 as the swing center.

  The insertion side air cylinder 32 and the withdrawal side air cylinder 33 are fixed to the support plate 911 and arranged on the upper side of the swing arm 31. As shown in FIG. 8, the insertion side air cylinder 32 and the withdrawal side air cylinder 33 are connected to a high-pressure air source 34 via an electromagnetic switching valve 35. The electromagnetic switching valve 35 makes the exit side air cylinder 33 communicate with the high pressure air source 34 in the non-excited state shown in FIG. The electromagnetic switching valve 35 allows the insertion side air cylinder 32 to communicate with the high pressure air source 34 in the excited state. Demagnetization and excitation of the electromagnetic switching valve 35 are controlled by the forging control unit 61. The insertion-side air cylinder 32 and the exit-side air cylinder 33 discharge internal high-pressure air when not connected to the high-pressure air source 34.

  The insertion side air cylinder 32 and the withdrawal side air cylinder 33 alternately drive the first drive point 311 and the second drive point 312. Specifically, the insertion-side air cylinder 32 has an insertion-side piston 321 that descends due to the inflow of high-pressure air. The descending insertion side piston 321 pushes down the first drive point 311 to drive the swing arm 31 swinging counterclockwise in FIG. As a result, the action point 313 moves to the right in FIG. 5 and the detection pin 2 is driven in the insertion direction. The exit side air cylinder 33 has an exit side piston 331 that descends due to the inflow of high-pressure air. The retreating-side piston 331 that descends pushes down the second drive point 312 to drive the swing arm 31 to swing clockwise in FIG. Thereby, the action point 313 moves to the left in FIG. 5, and the detection pin 2 is driven in the withdrawal direction.

  Here, the first length R1 connecting the fulcrum 314 and the first drive point 311 is equal to the second length R2 connecting the fulcrum 314 and the second drive point 312. The first length R1 and the second length R2 correspond to the drive side length. The working side length R3 connecting the fulcrum 314 and the working point 313 is larger than the first length R1 and the second length R2. Therefore, the action point 313 moves greatly due to the small driving amount of the first driving point 311 and the second driving point 312, and a large moving amount of the detection pin 2 is obtained. Thereby, high-speed inspection corresponding to high-speed production of the multi-process forging machine 9 becomes possible.

  In addition, the structure of the drive part 3 can be variously deformed. For example, electric devices such as a rotary solenoid and a stepping motor can be used instead of the insertion side air cylinder 32 and the withdrawal side air cylinder 33. In this case, the drive angle range of the electric device is driven to coincide with the swing angle range of the swing arm 31. According to this, even the multi-process forging machine 9 in the factory where the high-pressure air source 34 is not provided can be inspected at high speed. Further, for example, one air cylinder that linearly drives the detection pin 2 without using the swing arm 31 may be used. Further, the detection pin 2 may be linearly driven by using the driving force of the main drive source 97 with a cam or the like.

  As shown in FIG. 5, the foreign object detection unit 4 includes an other side detection unit that is disposed in proximity to the other side of the product 85. The other side detection unit includes a detection case 41, a detection plate 42, a coil spring 43, a standby conductor 44, and the like. The forging control unit 61 is also used as a determination unit that determines the presence or absence of foreign matter.

  The detection case 41 is fixed to the frame 91. The detection case 41 has an internal space 411 and a round window 412 having a common axis AX on the side facing the product 85. The round window 412 has an inner diameter set smaller than the outer diameter D1 of the product 85 so that the product 85 does not enter. In addition, the round window 412 is set to have an inner diameter larger than the outer diameter (≈inner diameter D2) of the pierce cusp 83 so that the pierce cusp 83 can enter.

  The detection plate 42 is a metal disk larger than the round window 412 and is held in the internal space 411 of the detection case 41. The detection plate 42 is normally pressed by the coil spring 43 and is located at a normal position in contact with the round window 412. The detection plate 42 is electrically connected to the frame 91 via the coil spring 43. When the detection plate 42 is pushed in the insertion direction of the detection pin 2, the detection plate 42 moves to a detection position separated from the round window 412 against the coil spring 43.

  The standby conductor 44 is a metal rod and is disposed in the internal space 411 of the detection case 41. The standby conductor 44 is attached while being electrically insulated from the frame 91. The standby conductor 44 does not contact the detection plate 42 at the normal position, but contacts the detection plate 42 at the detection position. Therefore, the detection plate 42 and the standby conductor 44 constitute a no-voltage contact 45. As shown in FIG. 7, the standby conductor 44 is connected to the connection lead 47 inside the insulating box 46. The connection lead 47 is connected to the sensor controller 48. The sensor controller 48 is provided to be grounded to the frame 91 and is connected to the forging control unit 61. When the non-voltage contact 45 becomes conductive even for a moment, the sensor controller 48 maintains the conductive state for a predetermined time and stabilizes the contact information.

  The stroke detection unit 5 monitors the movement stroke amount of the detection pin 2 and detects a shortage of the movement stroke amount caused by the foreign matter. As the stroke detection unit 5, a piston position detection sensor embedded in the insertion side air cylinder 32 is used. The stroke detection unit 5 detects the lowered position of the insertion-side piston 321 and sends detection information to the forging control unit 61. From the lowered position of the insertion side piston 321, the swing angle of the swing arm 31 and the position of the detection pin 2 are specified. As the stroke detector 5, an angle sensor that detects the swing angle of the swing arm 31, a linear encoder that directly detects the position of the detection pin 2, or the like may be used.

  The forging control unit 61 controls the entire forging operation of the multi-step forging machine 9. The forging control unit 61 can be configured using an electronic control device that has a CPU and operates by software. The forging control unit 61 is used while being grounded to the frame 91. The forging control unit 61 is connected to a rotary encoder 62. The rotary encoder 62 is generally provided conventionally to detect the rotational phase of the main drive source 97.

  The forging control unit 61 includes the determination function of the foreign object detection unit 4. More specifically, the forging control unit 61 detects the state of the no-voltage contact 45 constituted by the detection plate 42 and the standby conductor 44 by supplying power to the sensor controller 48. When the forging control unit 61 detects the conduction state of the non-voltage contact 45, it outputs a detection signal Sa that means “existence of foreign matter”. Further, the forging control unit 61 obtains the detection information of the stroke detection unit 5 and outputs a detection signal Sb when it detects that the movement stroke amount of the detection pin 2 is insufficient. When the detection signal Sa or the detection signal Sb is output, the forging control unit 61 interrupts the forging operation and waits for the arrival of the inspector. The forging control unit 61 also serves as part of the function of the drive control unit, and controls the electromagnetic switching valve 35 described above.

  Next, the operation and action of the forging machine inspection apparatus 1 of the first embodiment configured as described above will be described. The forging control unit 61 controls the forging operation, and inspects for the presence of foreign matter based on the hole forming process execution cycle in the fifth forging step. The forging control unit 61 predicts the carry-in timing of the product 85 from the fifth forging process unit based on the detection information of the rotary encoder 62, and excites the electromagnetic switching valve 35 in accordance with this. Thereby, high pressure air flows into the insertion side air cylinder 32, the insertion side piston 321 descends, and the detection pin 2 is driven in the insertion direction.

  When the product 85 is normal, the tip of the detection pin 2 is inserted into the through hole 86 of the product 85, passes through the through hole 86, and reaches the middle of the round window 412. Even so, the tip of the detection pin 2 does not reach the detection plate 42. Therefore, the detection plate 42 does not move from the normal position, and the no-voltage contact 45 remains in a disconnected state. Therefore, the forging control unit 61 does not output the detection signal Sa. Further, since the insertion side piston 321 is sufficiently lowered, the forging control unit 61 does not output the detection signal Sb.

  When the pierce cusp 83 remains in the through-hole 86 of the product 85, the tip of the detection pin 2 inserted into the through-hole 86 pushes the pierce cusp 83. The pierce cusp 83 that is pushed moves to the inside of the round window 412 and further pushes the detection plate 42 in the insertion direction. As a result, the detection plate 42 moves from the normal position to the detection position, and the no-voltage contact 45 changes to a conductive state. Therefore, the forging control unit 61 outputs the detection signal Sa.

  Furthermore, the pierce cusp 83 becomes an obstacle, and the moving stroke amount of the detection pin 2 is insufficient. For this reason, the insertion side piston 321 cannot sufficiently descend. Therefore, the forging control unit 61 also outputs the detection signal Sb. As described above, the remaining pierce casks 83 are detected by two detection methods, respectively, and the inspection reliability is improved. Further, at this time, the insertion side air cylinder 32 exerts a buffering action and softens the shock. Therefore, the product 85 is not adversely affected, and the forging machine inspection device 1 itself does not break down.

  Further, there may be a case where the work 81 from which the pierce cusp 83 has not been removed is carried in for some reason. In this case, the tip of the detection pin 2 inserted into the through hole 86 collides with the molding target portion 82 and stops. Therefore, the detection plate 42 does not move and the detection signal Sa is not output. On the other hand, the lowering amount of the insertion side piston 321 is significantly insufficient, so that the detection signal Sb is output. Also at this time, the insertion-side air cylinder 32 exhibits a buffering action and softens the shock, so that no trouble occurs.

  When the inspection is completed, the forging control unit 61 cancels the excitation of the electromagnetic switching valve 35. Then, high pressure air flows into the exit side air cylinder 33 and the exit side piston 331 descends. At the same time, high pressure air flows out from the insertion side air cylinder 32 and the insertion side piston 321 rises. Thereby, the detection pin 2 is driven in the withdrawal direction. Thereafter, the pair of fingers 71 are opened, and the product 85 is dropped and carried out.

  The forging machine inspection apparatus 1 according to the first embodiment is provided in a multi-step forging machine 9 that manufactures a product 85 having a through hole 86 by subjecting a workpiece 81 to hole forming using a punch 96 and a die 93. A forging machine inspection apparatus 1 for inspecting the presence or absence of foreign matter that may remain inside the through-hole 86, having a tip shape that matches the shape of the through-hole 86 and the foreign matter, and the through-hole from one side of the product 85 The detection pin 2 inserted into the 86, the drive unit 3 for driving the insertion and withdrawal of the detection pin 2 into and from the through hole 86, and the detection pin 2 inserted into the through hole 86 pushes the foreign matter or A foreign matter detection unit 4 that detects contact.

  According to this, the detection pin 2 can be inserted into the through hole 86 from one side of the product 85 by the drive unit 3, and the presence or absence of the foreign matter can be inspected by the foreign matter detection unit 4. Accordingly, it is possible to automatically inspect for the presence or absence of foreign matter that may remain inside the through hole 86.

  Further, the foreign matter detection unit 4 is held on the other side of the product 85 and is pushed by the pierce cusp 83 (foreign matter) that is pushed and moved in the insertion direction of the detection pin 2 or contacts the pushed foreign matter. It has the detection plate 42, and the other side detection part which detects the movement of the detection plate 42, or the contact of the detection plate 42 and a foreign material. According to this, the presence of a foreign object can be reliably detected by pushing the foreign object.

  Further, when the metal detection plate 42 is pushed by the pushed pierce casks 83 (foreign matter) and moves in the insertion direction of the detection pin 2, the metal detection plate 42 comes into contact with the standby conductor 44, and the other side detection unit is connected to the detection plate 42. An electrical continuity state with the standby conductor 44 is detected. According to this, when electrical continuity between the detection plate 42 and the standby conductor 44 occurs, it can be reliably detected that there is a foreign object.

  Furthermore, a stroke detecting unit 5 is further provided that monitors the amount of movement stroke of the detection pin 2 and detects a shortage of the amount of movement stroke caused by a foreign object. According to this, by combining the two detection methods, the inspection reliability of the presence / absence of foreign matter is improved, and various types of foreign matter can be detected.

  Moreover, the transfer apparatus 7 (product conveyance part) which carries in the product 85 from the 5th forging process part comprised by the punch 96 and the die | dye 93, and carries out the test | inspection finished product 85 (product conveyance part) is further provided. According to this, the conveyance of the product 85 accompanying the inspection can be automated.

  Further, the drive unit 3 includes a swing arm 31 having a fulcrum 314 supported in a swingable manner, a first drive point 311, a second drive point 312, and an action point 313 for driving the detection pin 2, and a first drive. A driving source that applies a driving force to the point 311 and the second driving point 312 to swing the swinging arm 31, and a drive control unit that controls the driving source based on an execution cycle of hole forming, The fulcrum 314 and the action point 313 are connected rather than the first length R1 connecting the fulcrum 314 of the swing arm 31 and the first drive point 311 and the second length R2 connecting the fulcrum 314 and the second drive point 312. The working side length R3 is larger.

  According to this, since the working side length R3 is larger than the driving side lengths (first length R1, second length R2) of the swing arm 31, the insertion side piston 321 and the withdrawal side piston 331 are small. A large amount of movement of the detection pin 2 is obtained depending on the driving amount. For this reason, the detection pin 2 can be reciprocated at high speed. In addition, the detection pin 2 can be driven based on the execution cycle of the hole forming process. Therefore, it corresponds to the high-speed production of the multi-process forging machine 9, and the presence or absence of foreign matter can be inspected at high speed for all the products 85.

  Further, the swing arm 31 has a first drive point 311 and a second drive point 312 as a pair of drive points, and a drive source is a pair of insertion-side air cylinders 32 that alternately drive the pair of drive points and a retreat. This is the side air cylinder 33. According to this, even if a shock occurs when the detection pin 2 is inserted, the insertion-side air cylinder 32 and the withdrawal-side air cylinder 33 exhibit a buffering action to reduce the shock. Therefore, the product 85 is not adversely affected, and the forging machine inspection device 1 itself does not break down. For example, even if the hole forming process is not performed and the molding object portion 82 is carried in while being coupled to the work 81 and the detection pin 2 collides with the molding object portion 82, no trouble occurs.

  The detection pin 2 has a hollow cylindrical shape. According to this, the detection pin 2 can be reduced in weight, thereby enabling high-speed inspection and reducing the size of the drive unit 3.

  In addition, the foreign matter includes a pierce cusp 83 that is removed from the work 81 by hole forming, and a forming target portion 82 that remains bonded to the work 81 without being subjected to hole forming. According to this, in addition to the function of inspecting the presence or absence of the pierce cusp 83, it is possible to have a function of detecting the unprocessed workpiece 81.

  Next, the forging machine inspection apparatus 1A according to the second embodiment in which the foreign object detection unit is the continuity detection unit 4A will be described mainly with respect to differences from the first embodiment. FIG. 9 is a diagram illustrating a control configuration of the forging machine inspection apparatus 1A according to the second embodiment. In the second embodiment, the detection case 41 and the detection plate 42 are not used. In the continuity detection unit 4A in the second embodiment, the detection pin 2 is used as a sensor, and the forging control unit 61 is also used. That is, the detection pin 2 is made of metal, is electrically insulated from the frame 91, and is connected to the sensor controller 48.

  On the other hand, the pierce residue 83 remaining on the product 85 and the molding target portion 82 that remains connected to the workpiece 81 are electrically connected to the frame 91 via the fingers 71. For this reason, a non-voltage contact 45 </ b> A is configured between the detection pin 2 and the pierce cusp 83. Similarly, a non-voltage contact 45 </ b> A is configured between the detection pin 2 and the molding target portion 82. Therefore, when the detection pin 2 moving in the insertion direction contacts the pierce cusp 83 or the molding target portion 82, the non-voltage contact 45A becomes conductive. The forging control unit 61 can detect the pierce cusp 83 or the molding target portion 82 from this conductive state.

  In the forging machine inspection apparatus 1A of the second embodiment, the foreign matter detection unit is a continuity detection unit that detects that the metal detection pin 2 is in contact with the metal foreign matter and is electrically connected. According to this, it can be detected that there is a foreign object without pushing the foreign object.

  Next, the inspection device for a forging machine according to the third embodiment having a different tip shape of the detection pin 2B will be described mainly with respect to differences from the first embodiment. FIG. 10 is a diagram illustrating the tip shape of the detection pin 2B of the forging machine inspection device according to the third embodiment. In the third embodiment, the configuration other than the tip shape of the detection pin 2B is the same as that of the first embodiment. The detection pin 2 </ b> B of the third embodiment includes a pin body 25 and a rear engagement portion 22.

  The pin body 25 is formed in an axisymmetric hollow cylindrical shape centering on the axis AX. The tip shape on the right side of the pin main body 25 in FIG. 10 is adapted to the shape of the burr 87 in addition to the through hole 86, the pierce cusp 83, and the molding target portion 82. Specifically, the outer periphery of the tip shape of the pin body 25 is stepped. That is, the outer diameter D4 of the small diameter portion 26 on the most distal side is the same as the outer diameter D4 of the first embodiment. The outer diameter D5 of the large-diameter portion 27 on the rear side of the small-diameter portion 26 is set to be larger than the outer diameter D4 and slightly smaller than the inner diameter D2 of the product 85.

  When the detection pin 2B of the third embodiment is used, not only the pierce cusp 83 and the molding target portion 82 but also the burrs 87 inside the through hole 86 of the product 85 can be detected. That is, since the small diameter portion 26 acts on the pierce cusp 83 and the molding target portion 82 in the same manner as in the first embodiment, the same detection is performed. In addition, when a small burr 87 is generated inside the insertion end side of the through hole 86, the small diameter portion 26 does not collide with the burr 87, but the tip of the large diameter portion 27 collides with the burr 87, and the detection pin 2B is Stop.

  Here, the movement stroke amount of the detection pin 2 </ b> B differs between the case where the small diameter portion 26 collides with the molding target portion 82 and the case where the large diameter portion 27 collides with the burr 87. Therefore, the forging control unit 61 can distinguish and detect the molding target portion 82 and the burr 87 based on the detection information of the stroke detection unit 5.

  In the forging machine inspection apparatus of the third embodiment, in addition to the inspection function for the presence of the pierce cusp 83, it is possible to have a function for detecting the unprocessed workpiece 81 and a function for inspecting the presence of the burr 87. .

  In addition, although the inspection apparatus 1 for forging machines is arrange | positioned in the downstream of the 5th forging process part in 1st Embodiment, it is not limited to this. That is, the forging machine inspection apparatus 1 may be provided so as to be replaceable with the punch 96 and the die 93 of any set of the multi-step forging machine 9. According to this, on the downstream side of any desired forging step, it is possible to automatically inspect for the presence or absence of foreign matter that may remain inside the through hole of the workpiece.

  Moreover, it is preferable to change the front-end | tip shape of the detection pin 2 suitably according to various shapes of multiple types of products and pierce. Further, as the foreign object detection unit 4, a detection method different from the first and second embodiments can be used. For example, when the product 85 and the pierce cusp 83 are made of iron, it is possible to use an approach detection sensor that detects the approach of the pierce cusp 83 to be pushed by the generation of an induction magnetic field. Furthermore, when only the pierce cusp 83 is considered as a foreign object to be inspected, the stroke detection unit 5 can be omitted. The present invention is not limited to the configuration of the embodiment, and various applications and modifications other than those described above are possible.

DESCRIPTION OF SYMBOLS 1, 1A: Inspection machine for forging machine 2, 2B: Detection pin 21: Pin main body 25: Pin main body 26: Small diameter part 27: Large diameter part 3: Drive part 31: Swing arm 311: Insertion side drive point 312: Retraction Side drive point 313: Action point 314: Support point 32: Insertion side air cylinder 33: Retraction side air cylinder 35: Electromagnetic switching valve 4: Foreign matter detection part 42: Detection plate 44: Standby conductor 45, 45A: Non-voltage contact 5: Stroke Detection unit 61: Forging control unit 7: Transfer device 71: Finger 81: Work piece 82: Molding target part 83: Pierce cus 85: Product 86: Through hole 87: Burr 9: Multi-process forging machine 91: Frame 93: Die 96: Punch R1: Insertion side length R2: Exit side length R3: Working side length

Claims (11)

A forging machine inspection device that is provided in a forging machine that manufactures a product having a through hole by subjecting a workpiece to hole forming using a punch and a die, and inspects for the presence of foreign matter that may remain inside the through hole. There,
A detection pin that has a tip shape that matches the shape of the through hole and the foreign matter, and is inserted into the through hole from one side of the product;
A drive unit for driving insertion and withdrawal of the detection pin into the through hole;
An inspection apparatus for a forging machine, comprising: a foreign matter detection unit that detects that the detection pin inserted into the through hole pushes the foreign matter or comes into contact with the foreign matter. The foreign object detector
A detection plate that is held on the other side of the product and is pushed by the pushed foreign matter to move in the insertion direction of the detection pin, or contacts the pushed foreign matter, and
The forging machine inspection device according to claim 1, further comprising: another side detection unit configured to detect movement of the detection plate or contact between the detection plate and the foreign matter. The metal detection plate comes into contact with the standby conductor when moved in the insertion direction of the detection pin by being pushed by the pushed foreign matter,
The said other side detection part is an inspection apparatus for forging machines of Claim 2 which detects the electrical continuity state of the said detection plate and the said waiting conductor.   2. The forging machine inspection device according to claim 1, wherein the foreign matter detection unit is a continuity detection unit that detects that the metal detection pin is in contact with the metal foreign matter and is electrically conductive.   The forging machine inspection device according to any one of claims 1 to 4, further comprising a stroke detection unit that monitors a movement stroke amount of the detection pin and detects a shortage of the movement stroke amount caused by the foreign matter.   The forging machine according to any one of claims 1 to 5, further comprising a product transporting unit that carries in the product from the forging process unit configured by the punch and the die and carries out the inspection-finished product. Inspection device. The drive unit is
A swing arm having a fulcrum supported in a swingable manner, a drive point, and an operating point for driving the detection pin;
A driving source for applying a driving force to the driving point to swing the swing arm;
A drive control unit that controls the drive source based on an execution cycle of the hole forming process;
The working side length connecting the fulcrum and the working point is larger than the driving side length connecting the fulcrum and the driving point of the swing arm,
The inspection apparatus for a forging machine according to any one of claims 1 to 6.   The inspection apparatus for a forging machine according to claim 7, wherein the swing arm has a pair of driving points, and the driving source is a pair of air cylinders that alternately drive the pair of driving points.   The inspection device for a forging machine according to any one of claims 1 to 8, wherein the detection pin has a hollow cylindrical shape.   The foreign matter includes at least one of a pierce cusp removed from the workpiece by the hole forming process, a molding target portion that remains bonded to the work without being subjected to the hole forming process, and a burr generated by the hole forming process. The inspection apparatus for forging machines as described in any one of Claims 1-9 containing. The forging machine is a multi-step forging machine comprising a plurality of sets of the punch and the die,
The inspection apparatus for a forging machine according to any one of claims 1 to 10, wherein the inspection apparatus is provided so as to be exchangeable with any one of the punch and the die.

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