Surface strengthening device and surface strengthening equipment

Abstract

The utility model relates to the technical field of surface strengthening of mechanical parts, and particularly discloses a surface strengthening device and surface strengthening equipment, and the surface strengthening device comprises a cutter assembly, a loading mechanism, a rotating seat and an XY-axis movement assembly. The tool assembly is arranged at the output end of the loading mechanism, and the loading mechanism is used for providing loading pressure for the tool assembly; the loading mechanism is arranged on the rotating seat, and the rotating seat can drive the loading mechanism to rotate around a C axis; the rotating seat is arranged on the XY-axis movement assembly, and the XY-axis movement assembly can drive the rotating seat to linearly move in the X-axis direction and the Y-axis direction. When the surface strengthening device is used for carrying out surface strengthening treatment on a workpiece, dynamic adjustment of the direction of the cutter assembly can be achieved, lateral component force errors of traditional single-shaft loading are avoided, and therefore load shifting in the strengthening process is reduced, the machining consistency and the complex geometric surface strengthening coverage rate are improved, and the machining efficiency is improved. And the surface strengthening effect on the special-shaped shaft is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical part surface strengthening technical field, more specifically, relate to a surface strengthening device and surface strengthening equipment. BACKGROUND

[0002] Surface strengthening is a commonly used process method for improving the surface performance of mechanical parts and components, improving fatigue strength and wear resistance. The core purpose is to significantly improve the functional characteristics of the surface without changing the overall performance of the material.

[0003] Taking shaft parts as an example, the configuration of conventional multi-section shafts is simple, and the surface to be strengthened is relatively standardized and easy to process. However, with the development of technology, more and more special-shaped shafts have appeared, such as wavy shafts, multi-curved surface shafts and composite morphology shafts. The configuration of these shafts is complex, and when traditional surface strengthening technology is used, the load fluctuation is large during the strengthening process, the processing consistency is poor, and the complex geometric surface strengthening coverage is low, so the strengthening effect is poor. UTILITY MODEL CONTENT

[0004] Therefore, the purpose of the utility model is to provide a surface strengthening device and surface strengthening equipment. The structural design of the surface strengthening device can effectively solve the problem of poor surface strengthening effect on special-shaped shafts.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0006] A surface strengthening device comprises:

[0007] A tool assembly;

[0008] A loading mechanism, wherein the tool assembly is arranged at the output end of the loading mechanism, and the loading mechanism is used to provide loading pressure to the tool assembly;

[0009] A rotating seat, wherein the loading mechanism is arranged at the rotating seat, and the rotating seat can drive the loading mechanism to rotate around the C-axis;

[0010] An XY-axis movement assembly, wherein the rotating seat is arranged at the XY-axis movement assembly, and the XY-axis movement assembly can drive the rotating seat to move linearly along the X-axis direction and the Y-axis direction;

[0011] Wherein, the X-axis direction and the Y-axis direction are different, and the C-axis is perpendicular to the X-axis direction and the Y-axis direction respectively.

[0012] Optionally, in the surface strengthening device, the loading mechanism comprises:

[0013] A telescopic driving member arranged at the rotating seat;

[0014] A guide is arranged at the fixed end of the telescopic driving member;

[0015] A sliding member is arranged at the driving end of the telescopic driving member and is capable of sliding along the guide under the driving of the telescopic driving member.

[0016] Optionally, in the surface strengthening device, a force sensor is arranged between the driving end of the telescopic driving member and the sliding member to detect the loading pressure applied by the telescopic driving member to the sliding member.

[0017] Optionally, in the surface strengthening device, a vibration sensor is arranged on the tool assembly to detect the vibration of the tool assembly.

[0018] Optionally, in the surface strengthening device, the XY-axis movement assembly comprises:

[0019] An X-axis linear guide rail comprises a first guide rail extending along the X-axis direction and a first sliding block arranged at the first guide rail, and the first sliding block is capable of moving along the first guide rail;

[0020] A Y-axis linear guide rail comprises a second guide rail extending along the Y-axis direction and a second sliding block arranged at the second guide rail, and the second sliding block is capable of moving along the second guide rail, the second guide rail is arranged at the first sliding block, and the rotating seat is arranged at the second sliding block.

[0021] Optionally, in the surface strengthening device, the bottom of the first guide rail is provided with a mounting portion for mounting the surface strengthening device to a workpiece clamping mechanism, the first sliding block is arranged at the top of the first guide rail, and the first sliding block comprises a sliding fitting portion extending along the X-axis direction and a supporting portion arranged at one end of the sliding fitting portion and extending along the Y-axis direction; the middle portion of the second guide rail is arranged at the sliding fitting portion, one end is arranged at the supporting portion, and the other end extends out of the sliding fitting portion.

[0022] Optionally, in the surface strengthening device, the XY-axis movement assembly further comprises a connecting frame, the connecting frame comprises a first horizontal plate, a vertical plate and a second horizontal plate, the first horizontal plate is arranged at the second sliding block, the vertical plate is arranged at one side of the second guide rail, the top end of the vertical plate is arranged at the first horizontal plate, and the bottom end is arranged at the second horizontal plate, the second horizontal plate extends away from the first horizontal plate from one end connected to the vertical plate to the other end, and the rotating seat is arranged at the first horizontal plate.

[0023] Optionally, in the surface strengthening device, a load balancing frame is arranged opposite to the tool assembly, the load balancing frame and the tool assembly are used to act on the workpiece from opposite sides of the workpiece, and the load balancing frame is capable of providing a balancing force to the workpiece.

[0024] Optionally, the surface strengthening device further comprises an auxiliary positioning frame arranged opposite to the tool assembly, and the auxiliary positioning frame comprises a positioning portion consistent with the shape of the outer circumferential surface of the workpiece.

[0025] The surface strengthening device comprises a tool assembly, a loading mechanism, a rotating seat and an XY-axis movement assembly.

[0026] The surface strengthening device provided by the utility model can realize dynamic adjustment of the position and angle of the tool assembly.

[0027] Therefore, in the process of surface strengthening treatment of the workpiece, especially for the surface strengthening treatment of the special-shaped shaft, the position and angle of the tool assembly can be adjusted according to the surface profile of the workpiece, so that the tool assembly always loads perpendicularly to the surface of the workpiece at the loading position.

[0028] In order to achieve the above-mentioned purpose, the utility model also provides a surface strengthening equipment, and the surface strengthening equipment comprises the surface strengthening device. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0030] Figure 1 It is a working state schematic view of the surface strengthening device of one specific embodiment of the present application.

[0031] Figure 2 It is a partial enlarged schematic view of Figure 1 .

[0032] Figure 3 It is a top view schematic view of Figure 1 .

[0033] Figure 4 It is an axial side schematic view of the surface strengthening device of one specific embodiment of the present application.

[0034] Figure 5 It is a partial schematic view of the surface strengthening device (XY axis movement assembly is not shown).

[0035] Figure 6 It is a corresponding loading structure partial cooperation schematic view. Figure 5

[0036] Figure 7 It is a cooperation schematic view of the tool assembly and the workpiece during the strengthening treatment.

[0037] Reference signs:

[0038] 10 - surface strengthening device; 20 - workpiece clamping mechanism; 21 - chuck; 22 - center; 30 - workpiece;

[0039] 100 - tool assembly; 200 - loading mechanism; 300 - rotating seat; 400 - XY axis movement assembly; 500 - force sensor; 600 - vibration sensor; 700 - load balancing frame; 800 - auxiliary positioning frame;

[0040] 210 - telescopic driving part; 220 - guide part; 230 - sliding part;

[0041] 410 - X-axis linear guide rail; 411 - first guide rail; 412 - first sliding block; 4121 - sliding cooperation part; 4122 - support part; 4111 - mounting part; 420 - Y-axis linear guide rail; 421 - second guide rail; 422 - second sliding block; 430 - connecting frame; 431 - first cross plate; 432 - vertical plate; 433 - second cross plate;

[0042] ​710 - balance frame positioning portion; 810 - positioning frame positioning portion. DETAILED DESCRIPTION

[0043] The utility model embodiment discloses a surface strengthening device and surface strengthening equipment can realize workpiece curved surface normal constant force loading to improve the surface strengthening effect of special-shaped shaft.

[0044] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0045] Traditional surface strengthening technology generally includes shot blasting, nitriding, laser quenching, ultrasonic rolling and the like. When special-shaped shafts are strengthened, the traditional surface strengthening technology has many deficiencies. Taking the shaft shoulder position as an example, the shaft shoulder is the key geometric transition part, stress concentration area and fatigue weak area of shaft parts. Stress concentration is easy to occur due to cross-section mutation, which becomes the main reason for failure. Therefore, the shaft shoulder area needs to be strengthened to improve its carrying capacity and fatigue life.

[0046] The surface roughness of conventional shot blasting strengthening treatment is high, and subsequent finishing is needed. The strengthening randomness is large, the uniformity is poor, the residual compressive stress layer is shallow, and the deep crack suppression is insufficient. The process cycle of nitriding treatment is long, and high temperature easily leads to deformation, which is not suitable for slender shafts, thin-walled or high-precision shaft parts. The equipment cost of laser surface quenching is high, the uniformity of the hardened layer is affected by the light spot energy distribution, and the complex geometric area (such as the fillet root) is easy to appear quenching blind area. The deformation layer of ultrasonic micro forging mode is shallow, which is easy to form grain size transition on the metal surface, resulting in a large number of shallow surface defects, and the equipment cost is high, and the operation technology requirement is high. Mechanical rolling can improve the surface hardness and smoothness through plastic deformation, but it is usually suitable for simple geometric shapes. For complex arc surfaces, it is difficult to achieve accurate coverage, and it is easy to appear rolling blind area or insufficient overlap rate. And for complex curved surfaces, when the loading force and the stress surface have an inclination angle, the effective load is the component force of the loading force, and the loading head cannot be perpendicular to the shaft shoulder arc in real time, resulting in inconsistent effective load at different positions, and further leading to uneven distribution of the strengthened layer.

[0047] Based on this, the application provides a surface strengthening device and a surface strengthening device, which is suitable for but not limited to surface strengthening of a shaft shoulder area. The surface strengthening device can make the surface gradient nanometerization of a part through controllable strong plastic deformation, and can adjust the loading direction according to the surface profile of the workpiece, so as to realize accurate control of the effective load, accurate load loading on the completely fitted curved surface, and realization of microstructure synergistic strengthening and deep layer compressive stress implantation of complex curved surfaces such as shaft shoulder areas. The strength and quality are taken into account, and the process efficiency is improved. In the following embodiments, the structure of the surface strengthening device is mainly described.

[0048] In some embodiments, referring to Figures 1-4 The surface strengthening device 10 provided by the utility model comprises a cutter assembly 100, a loading mechanism 200, a rotating seat 300 and an XY axis movement assembly 400. The cutter assembly 100 is used for contacting the workpiece 30 to apply a load to the workpiece 30. The cutter assembly 100 is arranged at the output end of the loading mechanism 200, and the loading mechanism 200 is used for providing a loading pressure to the cutter assembly 100, so that the cutter assembly 100 can apply the loading pressure to the workpiece 30. It can be understood that the type of the loading mechanism 200 can be set as required, and the loading mechanism 200 can output a loading force, for example, a motor drive, a cylinder drive, a hydraulic motor drive and the like. The cutter assembly 100 can adopt a conventional structure capable of applying a pressure to a workpiece, for example, a cutter assembly of a traditional mechanical rolling.

[0049] The loading mechanism 200 is arranged at the rotating seat 300, and the rotating seat 300 can output rotation around the C-axis to drive the loading mechanism 200 to rotate around the C-axis and drive the cutter assembly 100 on the loading mechanism 200 to rotate around the C-axis. For example, the axis of the cutter assembly 100 is perpendicular to the C-axis and intersects with the C-axis, so as to facilitate control of the rotation angle of the cutter assembly 100. It can be understood that the driving mode of the rotating seat 300 can also be set as required, for example, a rotating motor is used to drive the loading mechanism 200 to rotate.

[0050] The rotating seat 300 is arranged at the XY axis movement assembly 400, and the XY axis movement assembly 400 can output linear motion in the X-axis direction and linear motion in the Y-axis direction to drive the rotating seat 300 to move linearly in the X-axis direction and the Y-axis direction, and then drive the loading mechanism 200 and the cutter assembly 100 thereon on the rotating seat 300 to move linearly in the X-axis direction and the Y-axis direction.

[0051] Through the movement of the XY axis movement assembly 400 in combination with the movement of the rotary seat 300, the adjustment of the position and angle of the tool assembly 100 in the plane can be realized to match the surface profile of the workpiece 30. That is, the tool assembly 100 has the functions of bidirectional walking displacement of the X axis and the Y axis, and has the function of rotating around the C axis, and the X axis, the Y axis and the C axis can realize linkage, so that the circular arc shape is fitted, and the tool assembly 100 can be always loaded perpendicularly to the circular arc surface (inner arc / outer arc). For example, when machining the inner arc, the tool assembly 100 can be moved to machine different arc positions, and the rotary seat 300 drives the tool assembly 100 to have different swing angles at different arc positions, so that the tool assembly 100 is always loaded perpendicularly to the circular arc surface, the load uniformity and the force distribution are more reasonable, the stacking is more uniform, so that the layer depth is strengthened and the effect consistency is better. The X axis direction and the Y axis direction are different, and the C axis is perpendicular to the X axis direction and the Y axis direction. For example, the X axis direction and the Y axis direction are perpendicular to each other and perpendicular to the C axis, so that the position control calculation amount can be simplified, and the position of the tool assembly 100 is facilitated.

[0052] When the surface strengthening device 10 is used for surface strengthening treatment of the workpiece 30, the workpiece 30 is first installed on the corresponding workpiece clamping mechanism 20. For example, the chuck 21 fixes the workpiece 30 from one end of the workpiece 30, and the other end of the workpiece 30 is clamped by the center 22. The chuck 21 drives the workpiece 30 to rotate to perform strengthening treatment on different positions of the workpiece 30 in the circumferential direction. The loading mechanism 200 provides loading pressure to the tool assembly 100, so that the tool assembly 100 acts on the surface of the workpiece 30 and applies load to the surface of the workpiece 30 to realize surface modification of the material of the workpiece 30 and nanoize the surface gradient of the part.

[0053] Since the loading mechanism 200 can rotate around the C axis under the driving of the rotary seat 300 and can move linearly along the X axis direction and the Y axis direction under the driving of the XY axis movement assembly 400, through the cooperation of linear motion and rotary motion, the dynamic adjustment of the orientation of the loading mechanism 200 can be realized, and the dynamic adjustment of the orientation of the tool assembly 100 arranged at the output end of the loading mechanism 200 can be realized.

[0054] Therefore, during the surface strengthening treatment of the workpiece 30, especially during the surface strengthening treatment of the special-shaped shaft, the orientation of the tool assembly 100 can be adjusted according to the surface profile of the workpiece 30, so that the tool assembly 100 always loads perpendicularly to the surface of the workpiece 30 at the loading position. Therefore, the loading force can be accurately controlled by the loading mechanism 200, the side force error of the traditional single-axis loading can be avoided, the load fluctuation in the strengthening process is reduced, and the machining consistency and the strengthening coverage rate of the complex geometric surface are improved.

[0055] The housing of the loading mechanism 200 is fixedly connected with the rotating seat 300. The rotating seat 300 is internally provided with a gear pair for rotation positioning and transmission, and a servo motor is used as a power source. Specifically, the rotating seat 300 can also be a rotating platform.

[0056] In some embodiments, the loading mechanism 200 comprises a telescopic driving member 210, a guide member 220 and a sliding member 230. The telescopic driving member 210 is arranged in the rotating seat 300. The guide member 220 is arranged at the fixed end of the telescopic driving member 210. The sliding member 230 is arranged at the driving end of the telescopic driving member 210 and can slide along the guide member 220 under the driving of the telescopic driving member 210. The fixed end of the telescopic driving member 210, i.e. the end not outputting telescopic movement, can be used for mounting the telescopic driving member 210. For example, the fixed end can be the housing of the telescopic driving member 210, which is arranged in the rotating seat 300, and the guide member 220 is arranged in the housing. The driving end of the telescopic driving member 210, i.e. the end outputting telescopic movement, is connected with the sliding member 230 to drive the telescopic movement of the sliding member 230, and can apply pressure to the tool assembly 100 through the sliding member 230 after the tool assembly 100 is brought into contact with the workpiece 30 by the sliding member 230. The telescopic driving member 210 can be a pneumatic cylinder or a hydraulic cylinder, etc. The telescopic stroke of the telescopic driving member 210 can be set as required. For example, the telescopic stroke is in the range of 9mm-11mm, and specifically 10mm. The loading mechanism 200 has telescopic function and can realize high-frequency response, heavy-load loading and high-precision load control. The guide member 220 and the sliding member 230 are in sliding fit, and the sliding direction is the loading axis direction. In this embodiment, the loading mechanism 200 is driven by the telescopic driving member 210, and the guide member 220 and the sliding member 230 are used for guiding and limiting to realize accurate control of the loading force direction.

[0057] In some examples, one of the guide member 220 and the sliding member 230 is provided with a sliding hole, and the other is arranged in the sliding hole. For example, the guide member 220 is a guide sleeve provided with a sliding hole, and the sliding member 230 is a guide block arranged in the sliding hole. The guide block can slide along the sliding hole under the driving of the telescopic driving member 210, and the loading force is transmitted to the tool assembly 100 through the guiding action of the sliding hole. In another example, the guide member 220 is a guide rod, and the sliding member 230 is a sliding sleeve arranged outside the guide rod to slide along the guide rod under the driving of the telescopic driving member 210.

[0058] In some embodiments, please refer to Figure 5 and Figure 6A force sensor 500 is arranged between the driving end of the telescopic driving member 210 and the sliding member 230 to detect the loading pressure applied by the telescopic driving member 210 to the sliding member 230. In an example, the force sensor 500 is a multi-dimensional force sensor. In assembly, the guide member 220 is slidingly fitted with the sliding member 230, the sliding member 230 is connected with one end of the force sensor 500, the other end of the force sensor 500 is connected with the driving end of the telescopic driving member 210, and the driving end of the telescopic driving member 210 can be moved forward and backward together with the force sensor 500 and the sliding member 230. The force sensor 500 can detect the loading pressure applied by the telescopic driving member 210 to the sliding member 230 when the tool assembly 100 acts on the workpiece 30, and since the tool assembly 100 can be perpendicular to the surface profile of the loading position on the workpiece 30, the loading pressure is the effective load, and thus the actual effective load can be reflected by the force sensor 500, thereby providing a basis for the load control of the strengthening treatment.

[0059] In some embodiments, referring to Figure 5 and Figure 6 , the tool assembly 100 is provided with a vibration sensor 600 for detecting the vibration of the tool assembly 100. The type of the vibration sensor 600 can be selected as needed, such as an acceleration sensor, a speed sensor, a displacement sensor, etc. In the process of normally realizing the rolling of the workpiece 30, the vibration of the tool assembly 100 is within a certain range, i.e. the normal vibration range. When the tool assembly 100 is abnormally worn, the vibration of the tool assembly 100 during the strengthening treatment will exceed the normal vibration range. Therefore, by detecting the vibration of the tool assembly 100 through the vibration sensor 600, the abnormal phenomenon of the tool assembly 100, such as wear, can be timely fed back to avoid affecting the surface strengthening effect. In addition, when the workpiece clamping mechanism 20 does not clamp the workpiece 30 in place, such as when the clamping is loose, the vibration of the tool assembly 100 during the strengthening treatment will also exceed the normal vibration range. Therefore, by detecting the vibration of the tool assembly 100 through the vibration sensor 600, the workpiece 30 can also be prevented from being clamped out of place, such as the workpiece 30 being deflected to cause the load applied by the tool assembly 100 to the surface of the workpiece 30 to be unstable, thereby affecting the strengthening effect. Therefore, by arranging the vibration sensor 600, the uniformity and reliability of the surface strengthening treatment can be further improved.

[0060] In an example, when the loading mechanism 200 includes the guide member 220 and the sliding member 230, the rear end of the tool assembly 100 is connected with the vibration sensor 600 to monitor the vibration signal of the tool during the machining process, the rear end of the vibration sensor 600 is connected with the sliding member 230, and the sliding member 230 is connected with the driving end of the telescopic driving member 210 through the force sensor 500. During the strengthening treatment, the detection of the load and the vibration of the tool assembly 100 can be realized.

[0061] Exemplarily, the tool assembly 100 is detachably arranged at the output end of the loading mechanism 200, so that the tool assembly 100 can be conveniently disassembled for maintenance or tool replacement.

[0062] In some embodiments, referring to Figures 2-4 , the XY-axis motion assembly 400 comprises an X-axis linear guide rail 410 and a Y-axis linear guide rail 420. The X-axis linear guide rail 410 comprises a first guide rail 411 extending along the X-axis direction and a first slider 412 arranged on the first guide rail 411, and the first slider 412 is movable along the first guide rail 411. The Y-axis linear guide rail 420 comprises a second guide rail 421 extending along the Y-axis direction and a second slider 422 arranged on the second guide rail 421, and the second slider 422 is movable along the second guide rail 421. The second guide rail 421 is arranged on the first slider 412, and the rotary seat 300 is arranged on the second slider 422. The linear movement of the first slider 412 along the first guide rail 411 drives the second guide rail 421 to move linearly along the X-axis direction, and then drives the second slider 422 to move linearly along the X-axis direction. The second slider 422 is also movable along the second guide rail 421, so as to realize the linear movement of the second slider 422 along the Y-axis direction. It can be understood that the X-axis linear guide rail 410 and the Y-axis linear guide rail 420 can be driven by motors respectively, so as to realize the accurate control of the displacement. Through the cooperation of the X-axis linear guide rail 410 and the Y-axis linear guide rail 420, the linear movement of the tool assembly 100 along the X-axis direction and the Y-axis direction can be realized, and the displacement of the two can be controlled respectively, so as to realize the accurate adjustment of the position of the tool assembly 100. Figure 4 In some embodiments, the X-axis direction is perpendicular to the axial direction of the workpiece 30, and the Y-axis direction is parallel to the axial direction of the workpiece 30. In other embodiments, the direction perpendicular to the axial direction of the workpiece 30 can be regarded as the Y-axis direction, and the Y-axis linear guide rail 420 can be arranged accordingly. The direction parallel to the axial direction of the workpiece 30 can be regarded as the X-axis direction, and the X-axis linear guide rail 410 can be arranged accordingly.

[0063] In some embodiments, the bottom of the first guide rail 411 is provided with a mounting portion 4111, which is used for mounting the surface strengthening device on the workpiece clamping mechanism 20. It can be understood that the structure of the mounting portion 4111 can be arranged according to the structure of the workpiece clamping mechanism 20, which is not limited here. Through the arrangement of the mounting portion 4111, the entire surface strengthening device can be conveniently mounted on the workpiece clamping mechanism 20 by the first guide rail 411, so as to realize the surface strengthening treatment of the workpiece 30 in cooperation with the workpiece clamping mechanism 20.

[0064] In some embodiments, the first slider 412 is arranged on the top of the first guide rail 411, and the first slider 412 comprises a sliding fitting part 4121 extending along the X-axis direction and a supporting part 4122 arranged at one end of the sliding fitting part 4121 and extending along the Y-axis direction; the middle part of the second guide rail 421 is arranged in the sliding fitting part 4121, one end is arranged in the supporting part 4122, and the other end extends out of the sliding fitting part 4121. It can be understood that the sliding fitting part 4121 and the supporting part 4122 can be an integral structure or a split structure connected by a conventional fixing method. The sliding fitting part 4121 can be slidably fitted with the first guide rail 411, and the supporting part 4122 is used to support the second guide rail 421, so as to increase the contact area of the first slider 412 and the second guide rail 421, and make the installation of the second guide rail 421 more stable and reliable. In addition, one end of the second guide rail 421 extends out of the sliding fitting part 4121, that is, forms a suspended structure relative to the first slider 412, thereby providing installation space for other connecting structures, which can better cooperate with the numerical control machine tool, and the overall structure is simple and compact.

[0065] In some embodiments, the XY-axis motion assembly 400 further comprises a connecting frame 430, the connecting frame 430 comprising a first horizontal plate 431, a vertical plate 432 and a second horizontal plate 433, the first horizontal plate 431 being arranged on the second slider 422, the vertical plate 432 being arranged on one side of the second guide rail 421 and the top end of the vertical plate 432 being arranged on the first horizontal plate 431, the bottom end being arranged on the second horizontal plate 433, the second horizontal plate 433 extending away from the first horizontal plate 431 from one end connected to the vertical plate 432 to the other end, and the rotating seat 300 being arranged on the first horizontal plate 431. The connecting frame 430 is used to realize the connection between the rotating seat 300 and the second slider 422. The first horizontal plate 431, the vertical plate 432 and the second horizontal plate 433 are connected in sequence in a Z shape, the first horizontal plate 431 and the second horizontal plate 433 extend in opposite directions from the two ends of the vertical plate 432, and a height difference is formed between the first horizontal plate 431 and the second horizontal plate 433, thereby providing a height space for the installation of the rotating seat 300, realizing the full utilization of the space on the side close to the workpiece 30, and effectively strengthening the processing with smaller stroke in the processing process, reducing the height occupation of the overall structure, and the layout of each component is more compact. For example, the first horizontal plate 431 and the second horizontal plate 433 are parallel to each other and perpendicular to the vertical plate 432.

[0066] In some embodiments, the surface strengthening device 10 further comprises a load balancing frame 700, which is arranged opposite to the tool assembly 100, and the load balancing frame 700 and the tool assembly 100 are used to act on the workpiece 30 from opposite sides of the workpiece 30, and the load balancing frame 700 can provide a balancing force to the workpiece 30. It can be understood that the arrangement of the load balancing frame 700 opposite to the tool assembly 100 means that the positions of the two relative to the workpiece 30 are on opposite sides of the workpiece 30, and thus the two can respectively apply forces to the workpiece 30 from the two sides. Specifically, the tool assembly 100 is used to apply a load to the workpiece 30 to achieve surface strengthening. The load balancing frame 700 is used to provide a balancing force to the workpiece 30 to balance the force on the workpiece 30, ensure the reliable clamping state of the workpiece 30, and thus ensure the surface strengthening treatment effect. Through the arrangement of the load balancing frame 700, the surface strengthening device 10 is especially suitable for applying a large radial load to the workpiece 30, i.e. in the case of a large load output by the loading mechanism 200, the large load of the loading mechanism 200 can be balanced through cooperation with the load balancing frame 700. For example, the size of the supporting force of the load balancing frame 700 is dynamically adjusted according to the size of the load of the loading mechanism 200.

[0067] In some embodiments, the load balancing frame 700 is provided with a balancing frame positioning portion 710 consistent with the shape of the outer circumferential surface of the workpiece 30, so as to apply a balancing force to the workpiece 30.

[0068] In some embodiments, the surface strengthening device 10 further comprises an auxiliary positioning frame 800, which is arranged opposite to the tool assembly 100, and the auxiliary positioning frame 800 comprises a positioning frame positioning portion 810 consistent with the shape of the outer circumferential surface of the workpiece 30. It can be understood that the arrangement of the auxiliary positioning frame 800 opposite to the tool assembly 100 means that the positions of the two relative to the workpiece 30 are on opposite sides of the workpiece 30, and thus the two can respectively act on the workpiece 30 from the two sides. The positioning frame positioning portion 810 is consistent with the shape of the outer circumferential surface of the workpiece 30, which can assist in strengthening the positioning of the center 22 to the workpiece 30, and ensure the rotation accuracy of the workpiece 30 during processing. For example, the auxiliary positioning frame 800 is arranged at one end close to the center 22.

[0069] In order to highlight the effect of the surface strengthening device 10 provided by the present application in surface strengthening treatment, the surface strengthening device 10 provided by the present application is used for surface strengthening treatment, and the effect is compared with that of the same workpiece 30 treated by shot peening, nitriding and laser surface quenching. The results are shown in the following table.

[0070] Table 1: Strengthening treatment effect of surface strengthening device strengthening treatment and conventional surface strengthening treatment

[0071]

[0072] It can be seen that the surface strengthening device 10 provided by the application has the advantages of large residual compressive stress depth, small surface roughness after treatment, small deformation, and moderate comprehensive cost.

[0073] The following describes the surface strengthening treatment of two different workpieces 30 using the surface strengthening device 10.

[0074] Example 1: Machining of an automobile half-shaft shoulder and journal, wherein the shoulder diameter D = 40 mm and the material is 40Cr.

[0075] Parameter setting: loading pressure F = 8000 N, tool radius R = 4 mm, workpiece 30 rotation speed ω = 60 rpm, and axial feed speed v = 0.1 mm / r.

[0076] Through linkage of the XY-axis motion assembly 400, the rotating seat 300 rotates around the C-axis to adapt to the contour trajectory of the workpiece 30. Please refer to Figure 7 When machining the left circular arc transition section, the tool as a whole slowly rotates from 180° to 90° along the path, and when machining the right circular arc transition section, the tool as a whole slowly rotates from 90° to 0° along the path, so that the tool is always fitted with the machining path.

[0077] During machining, the workpiece 30 rotates at a constant speed, the tool feeds along the X-axis direction and the Y-axis direction according to the predetermined trajectory, and rotates around the C-axis at 200 rpm. The loading mechanism 200 maintains the rolling pressure at 8000 ± 80 N. After the strengthening treatment, the surface roughness Ra decreases from 1.6 μm to 0.1 μm, the residual compressive stress layer depth is 1.2 mm, and the fatigue life is improved by 50%.

[0078] Example 2: Machining of a crankshaft shoulder, wherein the shoulder diameter D = 150 mm and the material is 42CrMo.

[0079] The circular arc transition position of the crankshaft shoulder is the most fatigue failure point, and the fatigue failure is usually caused by deep micro-crack growth. By means of strong plastic deformation, the surface layer grains are refined, so as to break the growth extension path of the micro-crack, and at the same time, the strong compressive stress implantation also improves the fatigue after loading.

[0080] During the strengthening machining, the XY-axis motion assembly 400 approaches the circular arc shoulder, and when machining different circular arc positions of the shoulder, the tool is in different angular states, so as to ensure that the loading of the shoulder at any position is vertical and the effective load is equal to the loading force, thereby keeping the strengthening effect and depth of the shoulder consistent.

[0081] During the machining process, the rolling force F is 3000N, the tool radius R is 1mm, and the feed speed v is 0.02mm / r. After the strengthening treatment, the shaft shoulder roundness error is less than or equal to 2μm, the surface hardness HLD is increased to 900, and there is no micro-crack.

[0082] It can be seen that, by using the surface strengthening device 10, high-precision strengthening can be achieved, the rolling force fluctuation is less than or equal to ±2%, and the surface roughness Ra is less than or equal to 0.2μm, which is suitable for precision shaft parts. Moreover, the surface strengthening device 10 has strong adaptability and can process shaft shoulders with a diameter of 5-200mm, and the circular arc fitting error is less than or equal to 0.01mm. In addition, the machining is efficient and stable, the efficiency is improved by 3 times compared with the traditional hydraulic rolling, and there is no risk of thermal deformation.

[0083] Based on the surface strengthening device provided in the above embodiments, the utility model also provides a surface strengthening equipment, which comprises a numerical control machine tool and any one of the surface strengthening devices in the above embodiments, and the numerical control machine tool comprises a workpiece clamping mechanism to install the workpiece. Since the surface strengthening equipment adopts the surface strengthening device in the above embodiments, the beneficial effects of the surface strengthening equipment are referred to the above embodiments.

[0084] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0085] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the utility model. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A surface strengthening device, characterized by, The utility model relates to a surface strengthening device, which comprises: a cutter assembly (100); a loading mechanism (200), wherein the cutter assembly (100) is arranged at the output end of the loading mechanism (200), and the loading mechanism (200) is used for providing a loading pressure to the cutter assembly (100); a rotating seat (300), wherein the loading mechanism (200) is arranged at the rotating seat (300), and the rotating seat (300) can drive the loading mechanism (200) to rotate around a C-axis; an XY-axis movement assembly (400), wherein the rotating seat (300) is arranged at the XY-axis movement assembly (400), and the XY-axis movement assembly (400) can drive the rotating seat (300) to move linearly along an X-axis direction and a Y-axis direction; wherein the X-axis direction and the Y-axis direction are different, and the C-axis is perpendicular to the X-axis direction and the Y-axis direction, respectively.

2. The surface strengthening apparatus according to claim 1, wherein The loading mechanism (200) comprises: a telescopic driving part (210), which is arranged at the rotating seat (300); a guide part (220), which is arranged at the fixed end of the telescopic driving part (210); a sliding part (230), which is arranged at the driving end of the telescopic driving part (210) and can slide along the guide part (220) under the driving of the telescopic driving part (210).

3. The surface strengthening apparatus of claim 2, wherein A force sensor (500) is arranged between the driving end of the telescopic driving part (210) and the sliding part (230) to detect the loading pressure applied by the telescopic driving part (210) to the sliding part (230).

4. The surface strengthening apparatus of claim 1, wherein A vibration sensor (600) is arranged on the cutter assembly (100) to detect the vibration of the cutter assembly (100).

5. The surface strengthening apparatus of claim 1, wherein The XY-axis movement assembly (400) comprises: an X-axis linear guide rail (410), which comprises a first guide rail (411) extending along the X-axis direction and a first sliding block (412) arranged at the first guide rail (411), and the first sliding block (412) can move along the first guide rail (411); a Y-axis linear guide rail (420), which comprises a second guide rail (421) extending along the Y-axis direction and a second sliding block (422) arranged at the second guide rail (421), and the second sliding block (422) can move along the second guide rail (421), the second guide rail (421) is arranged at the first sliding block (412), and the rotating seat (300) is arranged at the second sliding block (422).

6. The surface strengthening apparatus of claim 5, wherein The bottom of the first guide rail (411) is provided with a mounting part (4111) for mounting the surface strengthening device to a workpiece clamping mechanism (20), the first sliding block (412) is arranged at the top of the first guide rail (411), and the first sliding block (412) comprises a sliding fitting part (4121) extending along the X-axis direction and a supporting part (4122) arranged at one end of the sliding fitting part (4121) and extending along the Y-axis direction; the middle part of the second guide rail (421) is arranged at the sliding fitting part (4121), one end is arranged at the supporting part (4122), and the other end extends out of the sliding fitting part (4121).

7. The surface strengthening apparatus of claim 5, wherein The XY axis movement assembly (400) further comprises a connecting frame (430), the connecting frame (430) comprises a first horizontal plate (431), a vertical plate (432) and a second horizontal plate (433), the first horizontal plate (431) is arranged on the second slider (422), the vertical plate (432) is arranged on one side of the second guide rail (421), the top end of the vertical plate (432) is arranged on the first horizontal plate (431), and the bottom end is arranged on the second horizontal plate (433), the second horizontal plate (433) extends away from the first horizontal plate (431) from one end connected with the vertical plate (432) to the other end, and the rotating seat (300) is arranged on the first horizontal plate (431).

8. The surface strengthening apparatus according to any one of claims 1 to 7, wherein Further comprising a load balancing frame (700) arranged opposite to the tool assembly (100), the load balancing frame (700) and the tool assembly (100) are used to act on the workpiece (30) from opposite sides of the workpiece (30), and the load balancing frame (700) can provide a balancing force to the workpiece (30).

9. The surface strengthening apparatus according to any one of claims 1 to 7, wherein Further comprising an auxiliary positioning frame (800) arranged opposite to the tool assembly (100), the auxiliary positioning frame (800) comprises a positioning part (810) consistent with the shape of the outer circumferential surface of the workpiece (30).

10. A surface strengthening apparatus characterized by comprising: The surface strengthening device comprises a numerical control machine tool and a numerical control machine tool, and the numerical control machine tool comprises a workpiece clamping mechanism (20) for mounting a workpiece (30).

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