Stress detection device for punch of cold header

Abstract

The invention relates to the technical field of cold header punch detection, in particular to a stress detection device for a cold header punch, which comprises a cold header main body frame, a feeding module is arranged on the right side of the cold header main body frame, a power module is arranged on the left side of the cold header main body frame, the power module drives the punch to reciprocate through a crankshaft and a connecting rod, and a detection module and an overturning module are arranged on the inner side wall of the cold header main body frame. A time delay module and a driving module are additionally arranged; in the working process, the power module drives the punch to machine, the standing frame moves, the driving module enables a second limiting column to be clamped into a radial groove of the time delay plate, the time delay plate is pushed to rotate, a protruding block triggers the overturning module, a probe is rotated to a detection position through a spiral limiting groove, and when the punch impacts, the probe detects stress through the magnetoelastic effect and transmits the stress to a detector. The second limiting column is switched to be clamped into the low-frequency or high-frequency delay plate groove position through the adjusting rod, the detection frequency is controlled through the groove number and inclination angle difference, automatic insertion of machining and detection is achieved, the punch stress problem is found in time, and different production rhythms are adapted.

Description

Technical Field

[0001] The present invention relates to the technical field of punch detection for cold heading machines, and particularly relates to a stress detection device for the punch of a cold heading machine. Background Art

[0002] A cold heading machine is an efficient processing device that forges metal billets into required-shaped parts at room temperature through metal plastic deformation. As the core component of the cold heading machine, the punch directly acts on the metal billet and realizes forming processing through impact and extrusion. Its performance has a decisive impact on the dimensional accuracy, surface quality, and production efficiency of the workpiece. During the long-term operation of existing cold heading machines, the punch is prone to accumulate excessive internal stress due to frequently bearing high-intensity impact and extrusion loads. When the stress exceeds the material limit, the punch will undergo irreversible deformation, which not only reduces the service life of the punch itself but also causes quality problems such as dimensional deviations and surface defects in the workpiece, seriously affecting the stability of cold heading processing and the qualified rate of finished products. Therefore, developing a device that can timely and accurately detect the stress state of the punch of a cold heading machine is of great significance for ensuring the quality of cold heading processing and the safe operation of the equipment. Summary of the Invention

[0003] In view of the above situation, to overcome the deficiencies of the prior art, the present invention provides a stress detection device for the punch of a cold heading machine to solve the above problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A stress detection device for the punch of a cold heading machine includes a main frame of the cold heading machine. A feeding module is arranged on the right side of the main frame of the cold heading machine. A power module is arranged on the left side inside the main frame of the cold heading machine. A power output crankshaft is arranged at the output end of the power module. A main control switch is fixedly connected to the outer surface of the main frame of the cold heading machine. A connecting rod is rotatably connected to the middle of the power output crankshaft. One end of the connecting rod is rotatably connected to a supporting frame. A punch mounting block is arranged at one end of the supporting frame. A punch is detachably connected to one end of the punch mounting block. A rotating shaft is arranged on the inner side wall of the main frame of the cold heading machine. A mounting seat is fixedly connected to the middle of the rotating shaft. A forming groove is detachably connected to the left side of the mounting seat through a forming die mounting groove and bolts. A detection module is arranged on the upper surface of the mounting seat. A flipping module is arranged on the inner side wall of the main frame of the cold heading machine behind the mounting seat. A time-delay module is arranged on the inner side wall of the main frame of the cold heading machine. A sliding groove is formed on the inner side wall of the main frame of the cold heading machine. A sliding column that slides on the inner side wall of the sliding groove is fixedly connected to the outer surface of the supporting frame. A connecting member is fixedly connected to one end of the sliding column. A driving module is fixedly connected to the outer surface of the connecting member.

[0005] Preferably, the detection module includes a magnetic measurement stress detector and a probe mounting groove. The probe mounting groove is formed on the upper surface of the mounting base. The inner side wall of the probe mounting groove is detachably connected with a magnetocrystalline anisotropy probe through bolts. The magnetic measurement stress detector is fixedly connected to the upper surface of the main frame of the cold heading machine. The magnetocrystalline anisotropy probe is electrically connected to the magnetic measurement stress detector through a wire.

[0006] Preferably, the flipping module includes a rectangular rod and a mounting frame. The mounting frame is fixedly connected to the inner side wall of the main frame of the cold heading machine. The outer surface of the mounting frame is fixedly connected with a first limiting column. The outer surface of the first limiting column is slidably connected with a limiting frame. A first spring is fixedly connected to the back of the limiting frame. The outer surface of the mounting frame is fixedly connected with a limiting sliding rod through a support rod. The inner side wall of the limiting frame is rotatably connected with a ball. The rectangular rod is fixedly connected to the rear end of the mounting base. The outer surface of the rectangular rod is slidably connected with a rotating block. A spiral limiting groove is formed on the outer surface of the rotating block.

[0007] Preferably, the delay module includes a rotating rod and a support rod. The rotating rod is rotatably connected to the inner side wall of the main frame of the cold heading machine through a bearing. A low-frequency delay plate is sleeved on the outer surface of the rotating rod. A first radial groove is formed on the outer surface of the low-frequency delay plate. A first driving inclined groove is formed on the outer surface of the low-frequency delay plate. A protrusion block is fixedly connected to the front of the low-frequency delay plate. A high-frequency delay plate is sleeved on the outer surface of the low-frequency delay plate. A second radial groove is formed on the outer surface of the high-frequency delay plate. A second driving inclined groove is formed on the outer surface of the high-frequency delay plate. A fixing seat is threadedly connected to one end of the bearing on the outer side of the main frame of the cold heading machine.

[0008] Preferably, a plurality of the first radial grooves and the first driving inclined grooves are both provided and evenly distributed in an annular array manner. The plurality of first radial grooves and the first driving inclined grooves are staggered and connected end to end with each other. The center line of the first radial groove coincides with the axis of the low-frequency delay plate. The depth of the first radial groove gradually increases radially outward from the central axis of the low-frequency delay plate. The depth of the first driving inclined groove gradually becomes shallower from inside to outside. A plurality of the second radial grooves and the second driving inclined grooves are both provided and evenly distributed in an annular array manner. The plurality of second radial grooves and the second driving inclined grooves are staggered and connected end to end with each other. The center line of the second radial groove coincides with the axis of the high-frequency delay plate. The depth of the second radial groove gradually increases radially outward from the central axis of the high-frequency delay plate. The depth of the second driving inclined groove gradually becomes shallower from inside to outside.

[0009] Preferably, the driving module includes a support rod, one end of the support rod is fixedly connected to the outer surface of the connecting member, a round barrel is fixedly connected to one end of the support rod, an adjusting barrel is movably connected to the inner side wall of the round barrel, an adjusting rod is fixedly connected to the outer surface of the adjusting barrel, a mountain-shaped limiting groove adapted to the adjusting rod is formed in the outer surface of the round barrel, a second limiting column is slidably connected to the inner side wall of the adjusting barrel, two second limiting columns are provided and symmetrically arranged, a second spring is arranged between the two second limiting columns, and one end of the second limiting column is slidably connected to the inner side wall of the first radial groove.

[0010] Preferably, the spiral limiting groove is spirally distributed, one end of the limiting sliding rod is slidably connected to the inner side wall of the spiral limiting groove, two first limiting columns are provided and symmetrically arranged, one end of the first spring abuts against the outer surface of the mounting bracket, and the outer surface of the ball abuts against the front surface of the low-frequency delay plate.

[0011] The beneficial effects of the present invention are as follows: 1. Through the cooperative setting of the detection module, the flipping module, the delay module and the driving module, when in use, the power module drives the device to work. During the working process, the driving module drives the delay module to rotate, and then prompts the flipping module to drive the detection module to rotate. During the next cold heading impact, the punch abuts against the magnetocrystalline anisotropy probe of the detection module, so as to perform stress detection on the probe through the magnetic stress detector. When the cold heading machine is working, after a specified time, the detection operation can be automatically inserted, and quality problems of the punch can be found in time, reducing goods losses, and realizing the function of timely and accurate detection of the stress state of the cold heading machine punch of the present invention.

[0012] 2. Through the cooperative setting of the driving module and the delay module, when in use, by adjusting the settings of the adjusting rod and the adjusting barrel in the driving module, the two second limiting columns can be inserted into the corresponding first radial groove and the first driving inclined groove or the second radial groove and the second driving inclined groove, so as to drive the low-frequency delay plate and the high-frequency delay plate to rotate at different speeds, and detect once when rotating one week, which is convenient to select the detection frequency and better cooperate with the production state to detect the punch in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the first three-dimensional of the present invention; Figure 2 is a schematic structural diagram of the second three-dimensional of the present invention; Figure 3 is the present invention Figure 1 The structural diagram at A in; Figure 4 is the present invention Figure 2 The structural diagram at C in; Figure 5 It is a schematic structural diagram inside the main frame of the cold heading machine of the present invention; Figure 6 It is a schematic structural diagram of the first three-dimensional view of the detection module of the present invention; Figure 7 It is a schematic structural diagram of the three-dimensional view of the rotating block of the present invention; Figure 8 It is a schematic structural diagram of the second three-dimensional view of the detection module of the present invention; Figure 9 It is a schematic structural diagram of the three-dimensional view of the flipping module of the present invention; Figure 10 It is a schematic structural diagram of the three-dimensional view of the flipping module and the delay module of the present invention; Figure 11 It is a schematic structural diagram of the first exploded view angle of the flipping module and the delay module of the present invention; Figure 12 It is a schematic structural diagram of the second exploded view angle of the flipping module and the delay module of the present invention; Figure 13 It is a schematic structural diagram of the three-dimensional view of the low-frequency delay board of the present invention; Figure 14 For the present invention Figure 13 The structural schematic diagram at position B in; Figure 15 It is a schematic structural diagram of the three-dimensional view of the drive module of the present invention.

[0014] In the attached drawings: 1. Main frame of the cold heading machine; 2. Feeding module; 3. Power module; 4. Power output crankshaft; 5. Total control switch; 6. Connecting rod; 7. Supporting frame; 8. Punch mounting block; 9. Punch; 10. Rotating shaft; 11. Mounting seat; 12. Forming die mounting groove; 13. Forming groove; 14. Probe mounting groove; 15. Magnetocrystalline anisotropy probe; 16. Rectangular rod; 17. Rotating block; 18. Spiral limiting groove; 19. Mounting frame; 20. First limiting column; 21. Limiting frame; 22. First spring; 23. Limiting slide bar; 24. Ball; 25. Sliding groove; 26. Sliding column; 27. Connecting piece; 28. Support rod; 29. Cylindrical barrel; 30. Adjusting barrel; 31. Adjusting rod; 32. Mountain-shaped limiting groove; 33. Second limiting column; 34. Second spring; 35. Bearing; 36. Rotating rod; 37. Low-frequency delay board; 38. First radial groove; 39. First driving inclined groove; 40. Protruding block; 41. High-frequency delay board; 42. Second radial groove; 43. Second driving inclined groove; 44. Fixed seat; 45. Magnetic measurement method stress detector. Detailed implementation manners

[0015] The following will refer to the attached drawings of the specification to describe each embodiment of the present invention in detail. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0016] Embodiment 1: Please refer to Figures 1 to 15 , a stress detection device for the punch of a cold heading machine, including the main frame 1 of the cold heading machine. A feeding module 2 is arranged on the right side of the main frame 1 of the cold heading machine. A power module 3 is arranged on the left side inside the main frame 1 of the cold heading machine. A power output crankshaft 4 is arranged at the output end of the power module 3. A total control switch 5 is fixedly connected to the outer surface of the main frame 1 of the cold heading machine (it should be noted that: the feeding module 2, the power module 3, the power output crankshaft 4, the total control switch 5, etc. are all prior arts, and the present invention will not disclose them in detail). A connecting rod 6 is rotatably connected to the middle of the power output crankshaft 4. One end of the connecting rod 6 is rotatably connected to a force application frame 7. One end of the force application frame 7 is provided with a punch mounting block 8. One end of the punch mounting block 8 is detachably connected to a punch 9. A rotating shaft 10 is arranged on the inner side wall of the main frame 1 of the cold heading machine. A mounting seat 11 is fixedly connected to the middle of the rotating shaft 10. The left side of the mounting seat 11 is detachably connected to a forming groove 13 through a forming die mounting groove 12 and bolts. A detection module is arranged on the upper surface of the mounting seat 11. A flipping module is arranged on the inner side wall of the main frame 1 of the cold heading machine at the rear side of the mounting seat 11. A time-delay module is arranged on the inner side wall of the main frame 1 of the cold heading machine. A sliding groove 25 is opened on the inner side wall of the main frame 1 of the cold heading machine. A sliding column 26 that slides on the inner side wall of the sliding groove 25 is fixedly connected to the outer surface of the force application frame 7. One end of the sliding column 26 is fixedly connected to a connecting member 27. A driving module is fixedly connected to the outer surface of the connecting member 27; The detection module includes a magnetic measurement method stress detector 45 and a probe mounting groove 14 (it should be noted that: the magnetic measurement method stress detector 45 and the probe mounting groove 14 are all prior arts, and the present invention will not disclose them in detail). The probe mounting groove 14 is opened on the upper surface of the mounting seat 11. A magnetocrystalline anisotropy probe 15 is detachably connected to the inner side wall of the probe mounting groove 14 through bolts. The magnetic measurement method stress detector 45 is fixedly connected to the upper surface of the main frame 1 of the cold heading machine. The magnetocrystalline anisotropy probe 15 is electrically connected to the magnetic measurement method stress detector 45 through a wire; The flipping module includes a rectangular rod 16 and a mounting bracket 19. The mounting bracket 19 is fixedly connected to the inner side wall of the cold heading machine main frame 1. A first limit post 20 is fixedly connected to the outer surface of the mounting bracket 19. A limit frame 21 is slidably connected to the outer surface of the first limit post 20. A first spring 22 is fixedly connected to the rear of the limit frame 21. A limit slide bar 23 is fixedly connected to the outer surface of the mounting bracket 19 through a support rod. A ball 24 is rotatably connected to the inner side wall of the limit frame 21. The rectangular rod 16 is fixedly connected to the rear end of the mounting seat 11. A rotating block 17 is slidably connected to the outer surface of the rectangular rod 16. A spiral limit groove 18 is formed on the outer surface of the rotating block 17. The spiral limit groove 18 is distributed in a spiral shape. One end of the limit slide bar 23 is slidably connected to the inner side wall of the spiral limit groove 18. There are two first limit posts 20 and they are symmetrically arranged. One end of the first spring 22 abuts against the outer surface of the mounting bracket 19. The outer surface of the ball 24 abuts against the front of the low-frequency delay plate 37; The delay module includes a rotating rod 36. The rotating rod 36 is rotatably connected to the inner side wall of the cold heading machine main frame 1 through a bearing 35. A low-frequency delay plate 37 is sleeved on the outer surface of the rotating rod 36. A first radial groove 38 is formed on the outer surface of the low-frequency delay plate 37. A first driving inclined groove 39 is formed on the outer surface of the low-frequency delay plate 37. A protruding block 40 is fixedly connected to the front of the low-frequency delay plate 37. A high-frequency delay plate 41 is sleeved on the outer surface of the low-frequency delay plate 37. A second radial groove 42 is formed on the outer surface of the high-frequency delay plate 41. A second driving inclined groove 43 is formed on the outer surface of the high-frequency delay plate 41. A fixing seat 44 is threadedly connected to one end of the bearing 35 located outside the cold heading machine main frame 1. A number of first radial grooves 38 and first driving inclined grooves 39 are provided and are evenly distributed in an annular array. A number of first radial grooves 38 and first driving inclined grooves 39 are staggered and connected end to end with each other. The center line of the first radial groove 38 coincides with the axis of the low-frequency delay plate 37. The depth of the first radial groove 38 gradually increases radially outward from the central axis of the low-frequency delay plate 37. The depth of the first driving inclined groove 39 gradually becomes shallower from the inside to the outside. A number of second radial grooves 42 and second driving inclined grooves 43 are provided and are evenly distributed in an annular array. A number of second radial grooves 42 and second driving inclined grooves 43 are staggered and connected end to end with each other. The center line of the second radial groove 42 coincides with the axis of the high-frequency delay plate 41. The depth of the second radial groove 42 gradually increases radially outward from the central axis of the high-frequency delay plate 41. The depth of the second driving inclined groove 43 gradually becomes shallower from the inside to the outside; The driving module includes a support rod 28, one end of which is fixedly connected to the outer surface of the connecting piece 27, one end of which is fixedly connected to a barrel 29, the inner wall of which is movably connected to an adjusting barrel 30, the outer surface of which is fixedly connected to an adjusting rod 31, the outer surface of which is provided with a mountain-shaped limiting groove 32 adapted to the adjusting rod 31, the inner wall of which is slidably connected to a second limiting column 33, two second limiting columns 33 are provided and are symmetrically arranged, a second spring 34 is provided between the two second limiting columns 33, and one end of the second limiting column 33 is slidably connected to the inner wall of the first radial groove 38.

[0017] Working principle: the power module 3 drives the power output crankshaft 4 to rotate, and drives the actuator frame 7 to reciprocate through the connecting rod 6 to make the punch 9 process the workpiece. When the actuator frame 7 moves, it drives the support rod 28 of the driving module to move horizontally through the sliding column 26 and the connecting piece 27. The adjusting barrel 30 in the round barrel 29 at the end of the support rod 28 is fixed by the adjusting rod 31 and the mountain-shaped limiting groove 32, so that the second limiting column 33 is stuck in the first radial groove 38 of the low-frequency delay plate 37; the movement of the support rod 28 pushes the second limiting column 33 to slide inward along the first radial groove 38, and falls into the first driving inclined groove 39 after reaching the end. When the support rod 28 returns, the angle of the inclined groove forces the low-frequency delay plate 37 to rotate. Every time the support rod 28 rotates one circle, the protruding block 40 at the front end pushes the limiting frame 21 of the flip module to slide along the first limiting column 20, compressing the first spring 22 while the limiting slide bar 2 3 slides along the spiral limit groove 18 of the rotating block 17, driving the rotating block 17 to rotate around the rectangular rod 16, so that the magnetocrystalline anisotropy probe 15 on the mounting seat 11 is flipped to the top of the forming groove 13; during the next cold heading impact, the punch 9 presses against the probe, detects the magnetic field change through the magnetoelastic effect and transmits it to the magnetic measurement stress detector 45 to calculate the stress value, and after the detection is completed, the low-frequency delay plate 37 continues to rotate, and after the protrusion block 40 is separated from the contact with the ball 24 on the limit frame 21, the first spring 22 resets to return the flip module to its original position; the annular array grooves of the low-frequency delay plate 37 control the rotation speed through the number and tilt angle, realizing the low-frequency detection logic of "detection once after processing N times", and the spiral limit groove 18 of the flip module cooperates with the limit slide bar 23 to convert the linear motion into rotational motion to accurately switch the detection position.

[0018] Embodiment 2: See also Figures 8 to 15, the delay module includes a rotating rod 36. The rotating rod 36 is rotatably connected to the inner side wall of the cold heading machine main frame 1 through a bearing 35. A low-frequency delay plate 37 is sleeved on the outer surface of the rotating rod 36. A first radial groove 38 is formed on the outer surface of the low-frequency delay plate 37. A first driving inclined groove 39 is formed on the outer surface of the low-frequency delay plate 37. A protruding block 40 is fixedly connected to the front surface of the low-frequency delay plate 37. A high-frequency delay plate 41 is sleeved on the outer surface of the low-frequency delay plate 37. A second radial groove 42 is formed on the outer surface of the high-frequency delay plate 41. A second driving inclined groove 43 is formed on the outer surface of the high-frequency delay plate 41. One end of the bearing 35 is threadedly connected with a fixed seat 44 on the outer side of the cold heading machine main frame 1. Both the first radial groove 38 and the first driving inclined groove 39 are provided with a plurality of them and are evenly distributed in an annular array manner. The plurality of first radial grooves 38 and first driving inclined grooves 39 are staggered and connected end to end with each other. The center line of the first radial groove 38 coincides with the axis of the low-frequency delay plate 37. The depth of the first radial groove 38 gradually increases radially outward from the central axis of the low-frequency delay plate 37. The depth of the first driving inclined groove 39 gradually becomes shallower from inside to outside. Both the second radial groove 42 and the second driving inclined groove 43 are provided with a plurality of them and are evenly distributed in an annular array manner. The plurality of second radial grooves 42 and second driving inclined grooves 43 are staggered and connected end to end with each other. The center line of the second radial groove 42 coincides with the axis of the high-frequency delay plate 41. The depth of the second radial groove 42 gradually increases radially outward from the central axis of the high-frequency delay plate 41. The depth of the second driving inclined groove 43 gradually becomes shallower from inside to outside; The driving module includes a support rod 28. One end of the support rod 28 is fixedly connected to the outer surface of the connecting piece 27. A round barrel 29 is fixedly connected to one end of the support rod 28. An adjusting barrel 30 is movably connected to the inner side wall of the round barrel 29. An adjusting rod 31 is fixedly connected to the outer surface of the adjusting barrel 30. A mountain-shaped limiting groove 32 adapted to the adjusting rod 31 is formed on the outer surface of the round barrel 29. A second limiting column 33 is slidably connected to the inner side wall of the adjusting barrel 30. There are two second limiting columns 33 and they are symmetrically arranged. A second spring 34 is arranged between the two second limiting columns 33. One end of the second limiting column 33 is slidably connected to the inner side wall of the first radial groove 38.

[0019] Working principle: The detection frequency is switched by adjusting the position of the adjusting rod 31 in the mountain-shaped limit groove 32. When the adjusting rod 31 is inserted into the front card slot, the front second limit post 33 is inserted into the first radial groove 38 of the low-frequency delay plate 37. Due to the large number and small inclination angle of the first radial groove 38 and the first driving inclined groove 39, the support rod 28 needs to drive the low-frequency delay plate 37 to rotate one week reciprocally for many times to achieve low-frequency detection. When the adjusting rod 31 is inserted into the rear card slot, the rear second limit post 33 is inserted into the second radial groove 42 of the high-frequency delay plate 41. The number of its grooves is small and the inclination angle is large. The support rod 28 can drive the high-frequency delay plate 41 to rotate with fewer reciprocations. Since the high-frequency delay plate 41 and the low-frequency delay plate 37 are coaxially fixed, the two rotate synchronously to accelerate the low-frequency delay plate 37 and shorten the detection period. The second spring 34 between the second limit posts 33 provides an elastic thrust to prevent the second limit posts 33 from disengaging from the first radial groove 38, the first driving inclined groove 39, the second radial groove 42, and the second driving inclined groove 43. The mountain-shaped limit groove 32 restricts the movement and rotation of the adjusting barrel 30 to ensure that the position is fixed after the mode switch. The dual-delay plate design realizes two detection frequencies of "low frequency" and "high frequency" through different groove types, adapts to different production rhythms, and the elastic structure and limit design take into account both the operation convenience and stability.

[0020] In summary, when the overall device is in use: During actual use, first, through the cooperation of the adjusting rod 31 and the mountain-shaped limit groove 32, the second limit post 33 is adjusted to extend from the front end or the rear end of the barrel 29. When it extends from the front end, the end of the second limit post 33 on the front side is caught in the first radial groove 38 behind the low-frequency delay plate 37. The device power module 3 provides power for the cold heading machine and the feeding module 2, and drives the power output crankshaft 4 to rotate. When the power output crankshaft 4 rotates, it drives the application frame 7 to reciprocate through the transmission of the connecting rod 6, thereby driving the punch 9 to move towards the forming groove 13 to process the workpiece to be processed. And each time during processing, the reciprocating movement of the application frame 7 will cause the sliding post 26 to reciprocate inside the sliding groove 25. At this time, the connecting member 27 drives the support rod 28 to reciprocate left and right. At this time, the second limit post 33 will first slide from the end of the first radial groove 38 away from the center of the low-frequency delay plate 37 to the end close to the center of the low-frequency delay plate 37. And because the first radial groove 38 gradually becomes shallower from the outside to the inside of the low-frequency delay plate 37, and the first driving inclined groove 39 gradually becomes deeper from the outside to the inside of the low-frequency delay plate 37. When it reaches the end of the first radial groove 38 close to the center of the low-frequency delay plate 37, it will enter the inside of the first driving inclined groove 39. When the workpiece processing is completed and returns to the original position, the support rod 28 drives the second limit post 33 to move left. And the first driving inclined groove 39 is obliquely arranged with the first radial groove 38. At this time, it will drive the low-frequency delay plate 37 to rotate a certain angle. And when the low-frequency delay plate 37 rotates until the protrusion block 40 in front pushes the limit frame 21 forward, at this time the limit frame 21 moves forward. The ball 24 ensures that the transmission between the limit frame 21 and the low-frequency delay plate 37 is smoother. When the limit frame 21 moves forward, it drives the rotating block 17 to move forward. And the spiral limit groove 18 on the outer surface of the rotating block 17 and the limit slide rod 23 behind the mounting frame 19 are arranged such that when the rotating block 17 and the mounting frame 19 move relative to each other, the rotating block 17 rotates itself. Then, through the rectangular rod 16, the rotating shaft 10 is driven to rotate a certain angle. At this time, the magnetocrystalline anisotropy probe 15 on the upper surface of the mounting seat 11 rotates to the position of the original forming groove 13. During the next impact, the end of the punch 9 will abut against the magnetocrystalline anisotropy probe 15. At this time, the stress of the punch 9 can be detected through the magnetocrystalline anisotropy probe 15 and the magnetic measurement method stress detector 45. The principle is: Under the action of stress, the magnetic permeability of ferromagnetic materials will change (magnetoelastic effect). By measuring the magnetic field distribution or the change of magnetic permeability on the surface of the punch 9, the data is transmitted to the magnetic measurement method stress detector 45, and then the stress of the punch 9 is indirectly calculated.Subsequently, through the arrangement of the first spring 22, after the low-frequency delay plate 37 rotates to the position where the protruding block 40 disengages from the abutment against the ball 24, the limit frame 21 drives the rotating block 17 to return to its original position. And through the arrangement of the limit slide rod 23 and the spiral limit groove 18, the rotating block 17 will also rotate to its original position, driving the magnetocrystalline anisotropy probe 15 and the forming groove 13 to return to their original positions respectively. At this time, whenever the low-frequency delay plate 37 rotates one week, the end of the punch 9 can be detected once. When the number of the first radial grooves 38 and the first drive inclined grooves 39 on the outer surface of the low-frequency delay plate 37 is large, the number of processing times required for one rotation is more. Similarly, when the adjusting rod 31 is adjusted to be stuck in the card slot at the rear side of the mountain-shaped limit groove 32, the end of the second limit post 33 at the rear side is stuck in the second radial groove 42 and the second drive inclined groove 43 in front of the high-frequency delay plate 41. The high-frequency delay plate 41 is fixed to the rear end of the bearing 35 through the fixed seat 44, and a flat key is also arranged between the low-frequency delay plate 37 and the bearing 35. At this time, when the high-frequency delay plate 41 rotates, the bearing 35 and the low-frequency delay plate 37 rotate synchronously. And the distribution number of the second radial groove 42 and the second drive inclined groove 43 on the high-frequency delay plate 41 is small, and the inclination angle of the second drive inclined groove 43 is larger. At this time, the rotation speed of the low-frequency delay plate 37 for one week can be higher, so that the stress of the punch 9 can be detected at a high frequency, and finally the effect that the user can independently select the frequency is achieved.

[0021] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating directions or position relationships are based on the directions or position relationships shown in the drawings. This is only for convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A stress detection device for a punch of a cold heading machine, comprising a main frame (1) of the cold heading machine. A feeding module (2) is arranged on the right side of the main frame (1) of the cold heading machine. A power module (3) is arranged on the left side inside the main frame (1) of the cold heading machine. A power output crankshaft (4) is arranged at the output end of the power module (3). A total control switch (5) is fixedly connected to the outer surface of the main frame (1) of the cold heading machine. A connecting rod (6) is rotatably connected to the middle of the power output crankshaft (4). One end of the connecting rod (6) is rotatably connected to a force application frame (7). A punch mounting block (8) is arranged at one end of the force application frame (7). A punch (9) is detachably connected to one end of the punch mounting block (8). A rotating shaft (10) is arranged on the inner side wall of the main frame (1) of the cold heading machine. A mounting seat (11) is fixedly connected to the middle of the rotating shaft (10). A forming groove (13) is detachably connected to the left side of the mounting seat (11) through a forming die mounting groove (12) and bolts. A detection module is arranged on the upper surface of the mounting seat (11). A flipping module is arranged on the inner side wall of the main frame (1) of the cold heading machine behind the mounting seat (11). A time delay module is arranged on the inner side wall of the main frame (1) of the cold heading machine. A sliding groove (25) is formed on the inner side wall of the main frame (1) of the cold heading machine. A sliding column (26) which slides on the inner side wall of the sliding groove (25) is fixedly connected to the outer surface of the force application frame (7). A connecting piece (27) is fixedly connected to one end of the sliding column (26). A driving module is fixedly connected to the outer surface of the connecting piece (27).

2. The stress detection device for the punch of a cold heading machine according to claim 1, wherein The detection module includes a magnetic measurement method stress detector (45) and a probe mounting groove (14). The probe mounting groove (14) is formed on the upper surface of the mounting seat (11). A magnetocrystalline anisotropy probe (15) is detachably connected to the inner side wall of the probe mounting groove (14) through bolts. The magnetic measurement method stress detector (45) is fixedly connected to the upper surface of the main frame (1) of the cold heading machine. The magnetocrystalline anisotropy probe (15) is electrically connected to the magnetic measurement method stress detector (45) through a wire.

3. The stress detection device for the punch of a cold heading machine according to claim 1, characterized in that, The flipping module includes a rectangular rod (16) and a mounting frame (19). The mounting frame (19) is fixedly connected to the inner side wall of the main frame (1) of the cold heading machine. A first limiting column (20) is fixedly connected to the outer surface of the mounting frame (19). A limiting frame (21) is slidably connected to the outer surface of the first limiting column (20). A first spring (22) is fixedly connected to the back of the limiting frame (21). A limiting sliding rod (23) is fixedly connected to the outer surface of the mounting frame (19) through a support rod. A ball (24) is rotatably connected to the inner side wall of the limiting frame (21). The rectangular rod (16) is fixedly connected to the rear end of the mounting seat (11). A rotating block (17) is slidably connected to the outer surface of the rectangular rod (16). A spiral limiting groove (18) is formed on the outer surface of the rotating block (17).

4. The stress detection device for the punch of a cold heading machine according to claim 1, characterized in that, The delay module includes a rotating rod (36) which is rotatably connected to the inner side wall of the cold heading machine main frame (1) through a bearing (35). A low-frequency delay plate (37) is sleeved on the outer surface of the rotating rod (36). A first radial groove (38) is formed on the outer surface of the low-frequency delay plate (37), and a first driving inclined groove (39) is formed on the outer surface of the low-frequency delay plate (37). A protruding block (40) is fixedly connected to the front surface of the low-frequency delay plate (37). A high-frequency delay plate (41) is sleeved on the outer surface of the low-frequency delay plate (37). A second radial groove (42) is formed on the outer surface of the high-frequency delay plate (41), and a second driving inclined groove (43) is formed on the outer surface of the high-frequency delay plate (41). One end of the bearing (35) is located outside the cold heading machine main frame (1) and is threadedly connected with a fixing seat (44).

5. The stress detection device for the punch of a cold heading machine according to claim 4, characterized in that, A plurality of the first radial grooves (38) and the first driving inclined grooves (39) are provided and are evenly distributed in a circular array. The plurality of the first radial grooves (38) and the first driving inclined grooves (39) are staggered and connected end to end. The central line of the first radial groove (38) coincides with the axis of the low-frequency delay plate (37). The depth of the first radial groove (38) gradually increases radially outward from the central axis of the low-frequency delay plate (37). The depth of the first driving inclined groove (39) gradually becomes shallower from inside to outside. A plurality of the second radial grooves (42) and the second driving inclined grooves (43) are provided and are evenly distributed in a circular array. The plurality of the second radial grooves (42) and the second driving inclined grooves (43) are staggered and connected end to end. The central line of the second radial groove (42) coincides with the axis of the high-frequency delay plate (41). The depth of the second radial groove (42) gradually increases radially outward from the central axis of the high-frequency delay plate (41). The depth of the second driving inclined groove (43) gradually becomes shallower from inside to outside.

6. The stress detection device for the punch of a cold heading machine according to claim 1, characterized in that, The driving module includes a support rod (28). One end of the support rod (28) is fixedly connected to the outer surface of a connecting member (27). A cylinder (29) is fixedly connected to one end of the support rod (28). An adjusting cylinder (30) is movably connected to the inner side wall of the cylinder (29). An adjusting rod (31) is fixedly connected to the outer surface of the adjusting cylinder (30). A mountain-shaped limiting groove (32) adapted to the adjusting rod (31) is formed on the outer surface of the cylinder (29). A second limiting column (33) is slidably connected to the inner side wall of the adjusting cylinder (30). Two of the second limiting columns (33) are provided and are symmetrically arranged. A second spring (34) is arranged between the two second limiting columns (33). One end of the second limiting column (33) is slidably connected to the inner side wall of the first radial groove (38).

7. The stress detection device for the punch of a cold heading machine according to claim 3, characterized in that, The spiral limiting groove (18) is distributed in a spiral shape. One end of the limiting slide rod (23) is slidably connected to the inner side wall of the spiral limiting groove (18). There are two first limiting columns (20) which are symmetrically arranged. One end of the first spring (22) abuts against the outer surface of the mounting bracket (19). The outer surface of the ball (24) abuts against the front surface of the low-frequency delay plate (37).

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