Micro-forging device for stroke monitoring

Abstract

The present invention provides an electromagnetic drive type micro forging device for stroke monitoring, which relates to the technical field of micro forging monitoring equipment. It includes a permanent magnet fixedly arranged relative to the outer shell; one end of the impact rod extends into the outer shell and is fixedly connected to the magnetic yoke, the coil is wound around the magnetic yoke, and the other end of the impact rod extends out of the outer shell; one side of the impact rod extending out of the housing is fixedly connected to the stroke measurement boss, and the end of the impact rod extending out of the outer shell is detachably and fixedly connected to the micro forging head; the laser displacement sensor is firmly installed on the outer wall of the outer shell; there is an acute angle between the emitted light of the laser displacement sensor and the central axis of the impact rod, and the emitted light of the laser displacement sensor is perpendicular to the measurement surface of the stroke measurement boss. The laser displacement sensor measures the displacement of the measurement surface perpendicular to it on the stroke measurement boss in real time, and then calculates the stroke of the impact rod through the angle between the emitted light of the laser displacement sensor and the axial direction of the impact rod, realizing the detection of the stroke of the micro forging device, and having a compact structure and high precision.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-forging monitoring equipment, and specifically, to a micro-forging device for stroke monitoring. Background Art

[0002] Micro-forging is a new mechanical surface modification process, which involves using a high-hardness hammer head with high-frequency oscillation to hammer the target area. Electromagnetic-driven micro-forging is a widely used micro-forging device. The driving device consists of magnetic poles, electromagnetic coils, etc. The impact structure, namely the forging head and the impact rod, performs reciprocating linear motion between the limit block and the workpiece surface under the excitation of the electromagnetic driving system. After the material undergoes continuous impacts of protons, strong plastic deformation occurs, and a certain amount of plastic deformation can improve the surface integrity of the material. The micro-forging device is generally installed at the end of a machine tool or a robotic arm through a mechanical interface, and process parameters such as stroke, step distance, row distance, and impact angle are adjusted. During the processing, the micro-forging head always maintains a constant distance from the workpiece surface to ensure that the workpiece material is subjected to an impact with precise position and uniform strength. Different metal material workpieces are surface-finished or strengthened through precise high-frequency impacts.

[0003] The existing Chinese patent application document with the publication number CN113862459B discloses a high-frequency electric pulse-assisted surface micro-forging device, including: a pulse generating device and an electromagnetic micro-forging device, wherein: the pulse generating device provides a high-energy current between the micro-forging punch of the electromagnetic micro-forging device and the workpiece, and utilizes the electroplastic effect to improve the micro-forging process effect.

[0004] Micro-forging is a controllable and orderly surface strengthening process. The micro-forging stroke, as a key variable for controlling the impact force and impact speed of the forging head, is a key factor determining the micro-forging strengthening effect. The on-line monitoring of the micro-forging stroke can obtain the actual strengthening effect of each micro-forging through the real stroke amplitude, which helps to improve the accuracy and consistency of the micro-forging process.

[0005] Currently, there is little research on the process monitoring system for electromagnetic micro-forging. There is no special on-line monitoring system for the micro-forging process. The micro-forging stroke is only given in the process design stage, and there is a lack of stroke monitoring means in actual processing, so the real strengthening effect of micro-forging cannot be effectively evaluated. Summary of the Invention

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a micro-forging device for stroke monitoring.

[0007] A micro forging device for stroke monitoring provided by the present invention includes a stroke measurement boss, a laser displacement sensor, a displacement sensor connection module, a shock rod, a permanent magnet, an air-cooling interface, a yoke, a coil, a housing, and a micro forging head. The permanent magnet is fixedly arranged relative to the housing. One end of the shock rod extends into the housing and is fixedly connected to the yoke. The coil is wound around the yoke. The other end of the shock rod extends out of the housing and the shock rod is slidably matched with the housing. One side of the shock rod extending out of the housing is fixedly connected to the stroke measurement boss. The end of the shock rod extending out of the housing is detachably and fixedly connected to the micro forging head. The laser displacement sensor is fixedly installed on the outer wall of the housing. There is an acute angle between the emitted light of the laser displacement sensor and the central axis of the shock rod, and the emitted light of the laser displacement sensor is perpendicular to the measurement surface of the stroke measurement boss.

[0008] Preferably, the stroke s of the micro forging device satisfies the following relational expression: s = h / sinα; where h represents the displacement of the measurement surface of the stroke measurement boss relative to the laser displacement sensor, and α is the acute angle between the emitted light of the laser displacement sensor and the central axis of the shock rod.

[0009] Preferably, the acute angle between the emitted light of the laser displacement sensor and the central axis of the shock rod is 45°.

[0010] Preferably, the laser displacement sensor is fixedly connected to the outer wall of the housing through a connector and in cooperation with the displacement sensor connection module.

[0011] Preferably, the micro forging head is threadedly connected to the end of the shock rod passing through the yoke.

[0012] Preferably, a shock rod is provided inside the housing. The shock rod is fixedly connected to the yoke and the coil. There is a gap between the coil and the permanent magnet fixedly connected to the housing, and the shock rod is slidably matched with the inner wall of the housing.

[0013] Preferably, it further includes an air-cooling interface for cooling the coil.

[0014] Preferably, with the retracted state of the shock rod as the stroke zero point, the laser displacement sensor real-time collects the displacement of the measurement surface of the stroke measurement boss relative to the laser displacement sensor.

[0015] Preferably, it further includes a processing system. The processing system obtains the information collected by the laser displacement sensor and calculates according to the following formula:

[0016] s = h / sinα;

[0017] where h is the displacement of the measurement surface of the stroke measurement boss relative to the laser displacement sensor, and α is the acute angle between the emitted light of the laser displacement sensor and the central axis of the shock rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention uses a laser displacement sensor fixedly arranged on the outer wall of the housing to measure in real time the displacement of the measurement surface perpendicular to the impact rod on the stroke measurement boss tightly connected to the impact rod, and then calculates the stroke of the impact rod through the angle between the emitted light of the laser displacement sensor and the axial direction of the impact rod, realizing the detection of the stroke of the micro-forging device, and having a compact structure and high precision.

[0020] 2. The present invention sets the acute angle between the emitted light of the laser displacement sensor and the central axis of the impact rod to be 45°, which helps to reduce interference and has a compact structure.

[0021] 3. The present invention enables the micro-forging head and the impact rod to be threadedly connected, which can realize the replacement of micro-forging heads with different punch diameters, helping to improve the applicability of the micro-forging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present invention will become more apparent:

[0023] Figure 1 It is a cross-sectional view mainly showing the overall structure of the micro-forging device of the present invention.

[0024] As shown in the figure:

[0025] Stroke measurement boss 1 Air cooling interface 6

[0026] Laser displacement sensor 2 Yoke 7

[0027] Displacement sensor connection module 3 Coil 8

[0028] Impact rod 4 Housing 9

[0029] Permanent magnet 5 Micro-forging head 10 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those of ordinary skill in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0031] Such as Figure 1As shown in the figure, a micro forging device for stroke monitoring according to the present invention includes a stroke measurement boss 1, a laser displacement sensor 2, a displacement sensor connection module 3, an impact rod 4, a permanent magnet 5, an air cooling interface 6, a yoke 7, a coil 8, a housing 9, and a micro forging head 10.

[0032] Specifically, the permanent magnet 5 is fixedly arranged relative to the housing 9, and the permanent magnet 5 generates a fixed magnetic field inside the system. One end of the impact rod 4 extends into the housing, and the other end of the impact rod 4 extends out of the housing and is slidably engaged with the housing 9. The end of the impact rod 4 extending out of the housing is mechanically fixedly connected to the stroke measurement boss 1, and the end of the impact rod 4 extending out of the housing 9 is detachably fixedly connected to the micro forging head 10. The coil 8 is wound around the yoke 7 fixedly connected to the part of the impact rod 4 extending into the housing 9. The permanent magnet 5, the yoke 7, and the coil 8 together form the drive system of the micro forging device.

[0033] When the coil 8 is energized and there is current inside, due to the principle of electromagnetic interaction, a corresponding electromagnetic force will be generated to drive the impact rod 4 and the micro forging head 10 to move. When an alternating current of a certain frequency is applied to the coil 8, a corresponding alternating electromagnetic force will be generated to drive the impact rod 4 and the micro forging head 10 to perform periodic motion. The impact rod 4 and the micro forging head 10 perform reciprocating mechanical impact motion, continuously impacting the surface of the part to achieve the mechanical strengthening effect.

[0034] The laser displacement sensor 2 is fixedly connected to the outer wall of the housing 9 through a connecting piece and the displacement sensor connection module 3 in a tightly fitting manner. The stroke measurement boss 1 is tightly connected to the part of the impact rod 4 extending out of the housing 9, and the stroke measurement boss 1 and the housing 9 move linearly relative to each other. The emitted light of the laser displacement sensor 2 forms an acute angle with the central axis of the impact rod 4, and the emitted light of the laser displacement sensor 2 is perpendicular to the measurement surface of the stroke measurement boss 1.

[0035] Furthermore, an impact rod 4 is provided inside the housing 9. The impact rod 4 is fixedly connected to the yoke 7 and the coil 8. There is a gap between the coil 8 and the permanent magnet 5 fixedly connected to the housing 9, and the impact rod 4 is slidably engaged with the inner wall of the housing 9. The impact rod 4, the yoke 7, and the coil 8 are tightly connected as a whole and can reciprocate along the length direction of the impact rod 4 inside the housing 9. The air cooling interface 6 is used to cool the coil 8 to ensure the service life of the micro forging device.

[0036] The laser displacement sensor 2 is fixedly connected to the housing 9 through the displacement sensor connection module 3. Since the forging head reciprocates along the axial direction during the micro-forging process, and due to the limitation of the range of the laser displacement sensor 2 itself and the geometric dimensions of the micro-forging device, it is difficult to directly collect data along the parallel movement direction through the laser displacement sensor 2. Therefore, the laser displacement sensor 2 is arranged at a certain acute angle with the movement direction of the micro-forging head 10. The designed stroke measurement boss 1 is fixedly connected to the impact rod 4 and moves together with the impact rod 4 and the micro-forging head 10. The stroke measurement boss 1 has a hypotenuse that is perpendicular to the optical path of the laser displacement sensor 2, and the laser displacement sensor 2 directly collects and measures the relative displacement of the hypotenuse of the stroke measurement boss 1.

[0037] It should be noted that preferably, the size of the acute angle between the emitted light of the laser displacement sensor 8 and the central axis of the impact rod 11 in this application is 45°, which can avoid interference and has a compact structure.

[0038] The stroke measurement boss 1 moves along the axial direction of the impact rod 4 with the impact rod 4. The magnitude of the axial movement of the impact rod 4 is the stroke s. The stroke s of the micro-forging device satisfies the following relational expression: s = h / sin a. Wherein, h represents the displacement of the measurement surface of the stroke measurement boss 1 relative to the laser displacement sensor 2, and a is the acute angle between the emitted light of the laser displacement sensor 2 and the central axis of the impact rod 4.

[0039] More specifically, the impact rod 4 to which the stroke measurement boss 1 is fixedly connected is in sliding fit with the inner wall of the housing 9.

[0040] In the actual application process, it is often necessary to replace the micro-forging head 10 with different punch diameters. For the convenience of operation, the micro-forging head 10 is threadedly connected to one end of the impact rod 4 that extends out of the housing 9. Through the stroke measurement boss 1 and the circumferential linear motion pair for guiding and positioning, the stroke acquisition system is integrated on the micro-forging device and will not change any positioning with the disassembly of the micro-forging head 10. There is no need to repeat positioning or over-disassemble when replacing the forging head.

[0041] More specifically, it further includes a processing system. The processing system obtains the information collected by the laser displacement sensor 2, processes the signal and then calculates according to the following formula:

[0042] s = h / sin a;

[0043] Wherein, h is the displacement of the measurement surface of the stroke measurement boss 1 relative to the laser displacement sensor 2, and a is the acute angle between the emitted light of the laser displacement sensor 8 and the central axis of the impact rod 4.

[0044] Taking the retracted state of the impact rod 4 as the stroke zero point, the laser displacement sensor 2 real-time collects the displacement of the measuring surface of the stroke measuring boss 1 relative to the laser displacement sensor 2. The laser displacement sensor 2 sends the collected optoelectronic signal of the movement of the stroke measuring boss 1 to the processing system by wired or wireless means for corresponding signal processing, and then the displacement of the stroke measuring boss 1 relative to the laser displacement sensor 2 can be obtained. Based on this, the impact distance of the micro forging head 10 can be indirectly obtained. Taking the retracted state of the micro forging head 10 as the stroke zero point, the stroke size of the micro forging head 10 can be obtained in real time. Before the start of the strengthening process, the initial stroke size can also be determined through this stroke monitoring device. At the same time, such an arrangement also makes the structure of the entire micro forging measurement device more compact.

[0045] Those skilled in the art know that in addition to implementing the system and its various devices, modules, and units provided by the present invention in the form of pure computer-readable program code, the method steps can be logically programmed to enable the system and its various devices, modules, and units provided by the present invention to be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers, etc. to achieve the same function. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a kind of hardware component, and the devices, modules, and units included therein for implementing various functions can also be regarded as the structures within the hardware component; the devices, modules, and units for implementing various functions can also be regarded as either software modules for implementing the method or structures within the hardware component.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0047] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments and features in the embodiments of the present application can be combined arbitrarily.

Claims

1. An electromagnetic drive type micro forging device for stroke monitoring, characterized in that, It includes a stroke measurement boss (1), a laser displacement sensor (2), a displacement sensor connection module (3), an impact rod (4), a permanent magnet (5), an air-cooling interface (6), a yoke (7), a coil (8), a housing (9), and a micro forging head (10). The permanent magnet (5) is fixedly arranged relative to the housing (9). One end of the impact rod (4) extends into the housing (9) and is fixedly connected to the yoke (7). The coil (8) is wound around the yoke (7). The other end of the impact rod (4) extends out of the housing (9), and the impact rod (4) is slidably engaged with the housing (9). One side of the impact rod (4) extending out of the housing is fixedly connected to the stroke measurement boss (1). The end of the impact rod (4) extending out of the housing (9) is detachably and fixedly connected to the micro forging head (10). The laser displacement sensor (2) is fixedly installed on the outer wall of the housing (9). There is an acute angle between the emitted light of the laser displacement sensor (2) and the central axis of the impact rod (4). The emitted light of the laser displacement sensor (2) is perpendicular to the measurement surface of the stroke measurement boss (1). The stroke s of the micro forging device satisfies the following relationship: s = h / sinα; Where h represents the displacement of the measurement surface of the stroke measurement boss (1) relative to the laser displacement sensor (2), and α is the acute angle between the emitted light of the laser displacement sensor (2) and the central axis of the impact rod (4). The laser displacement sensor (2) is fixedly connected to the outer wall of the housing (9) through a connecting piece and in cooperation with the displacement sensor connection module (3).

2. The electromagnetic drive type micro forging device for stroke monitoring according to claim 1, characterized in that, The acute angle between the emitted light of the laser displacement sensor (2) and the central axis of the impact rod (4) is 45°.

3. The electromagnetic drive type micro forging device for stroke monitoring according to claim 1, characterized in that, The micro forging head (10) is threadedly connected to one end of the impact rod (4) extending out of the housing (9).

4. The electromagnetic drive type micro forging device for stroke monitoring according to claim 1, characterized in that, The housing (9) is provided with an impact rod (4) inside. The impact rod (4) is fixedly connected to the yoke (7) and the coil (8). There is a gap between the coil (8) and the permanent magnet (5) fixedly connected to the housing (9), and the impact rod (4) is slidably engaged with the inner wall of the housing (9).

5. The electromagnetic drive type micro forging device for stroke monitoring according to claim 1, characterized in that, It further includes an air-cooling interface (6) which is used to cool the coil (7).

6. The electromagnetic drive type micro forging device for stroke monitoring according to claim 1, characterized in that, Taking the retracted state of the impact rod (4) as the stroke zero point, the laser displacement sensor (2) continuously acquires the displacement of the measurement surface of the stroke measurement boss (1) relative to the laser displacement sensor (2).

7. The electromagnetic drive type micro forging device for stroke monitoring according to claim 1, characterized in that, It further includes a processing system which obtains the information collected by the laser displacement sensor (2) and calculates according to the following formula: s = h / sinα; Where h represents the displacement of the measurement surface of the stroke measurement boss (1) relative to the laser displacement sensor (2), and α is the acute angle between the emitted light of the laser displacement sensor (2) and the central axis of the impact rod (4).

Images