A device for cutting and polishing a shear notch of a leaf spring

Abstract

The utility model provides a kind of automobile plate spring shearing port polishing equipment, including workbench, the workbench is fixedly installed on the rack, servo motor and lifting platform are installed on the lifting mechanism fixedly installed on the workbench, lifting platform is fixedly connected with sliding seat by lifting column, the sliding seat is equipped with inner arc polisher in cooperation with the sliding slot of being penetrated and being opened itself;Limiting vertical plate fixedly installed on the workbench is provided with eyelet shaft, and locking sleeve is installed on eyelet shaft;The utility model makes polisher move along plate spring eyelet arc track by semicircular sliding seat and arc sliding slot, accurate contour is adhered;Screw lifter is linked with servo motor, and clamping frequency is reduced;Mirror image limiting vertical plate and locking sleeve realize rigid fixing, ensure edge processing precision and consistency.

Description

Technical Field

[0001] This utility model belongs to the field of leaf spring grinding technology, and in particular relates to a grinding device for the shearing edge of automotive leaf springs. Background Technology

[0002] Leaf springs, also known as steel leaf springs, are the core elastic element of automotive suspension systems. They are composed of multiple alloy spring leaves of unequal length, and their curved structure is crucial to the vehicle's load-bearing capacity and driving stability. In the current production process of leaf springs, the sheared edges after cutting need to be ground to remove burrs, optimize surface quality, and ensure assembly accuracy. However, traditional grinding equipment generally suffers from the following problems:

[0003] Insufficient adaptability to curved contours: The coiled part and middle of leaf springs often have a curved structure, but traditional equipment mostly uses a linear reciprocating grinding method, which is difficult to accurately fit complex contours. For example, when the linearly moving grinding wheel processes curved edges, the change in contact angle will cause uneven local pressure, resulting in over-grinding or residual burrs. It is necessary to manually adjust the angle repeatedly or clamp multiple times, which is inefficient and has large fluctuations in accuracy.

[0004] Low efficiency of multi-process collaboration: Leaf spring processing involves multiple processes such as sawing, grinding, and drilling, but traditional equipment is mostly composed of independent modules, and repeated clamping can easily lead to positioning deviations. For example, although some equipment integrates multiple processes, it has not been structurally optimized for arc grinding, and manual intervention is still required to adjust the grinding path, resulting in a longer processing cycle and significant loss of accuracy.

[0005] Therefore, it is essential to invent a grinding device for the shearing cut of automotive leaf springs. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a grinding device for the shearing edge of automotive leaf springs, including a worktable, a frame, a lifting mechanism, a servo motor, a lifting platform, a lifting column, a sliding seat, an inner arc grinder, a slide groove, a limiting plate, a trunnion, and a locking sleeve. The worktable is fixedly installed on the frame. The lifting mechanism fixedly installed on the worktable is equipped with a servo motor and a lifting platform. The lifting platform is fixedly connected to the sliding seat through the lifting column. The inner arc grinder is installed on the sliding seat in conjunction with the slide groove that runs through it. A trunnion is provided on the limiting plate fixedly installed on the worktable, and a locking sleeve is installed on the trunnion.

[0007] Preferably, the lifting mechanism installed on one side above the workbench is a screw jack. The upper end of the screw in the lifting mechanism is fixed to the output end of a servo motor fixedly installed outside the machine housing. In addition, the screw and slide column in the lifting mechanism are connected to the lifting platform through ball nuts and linear bearings. The lifting mechanism, together with the lifting platform and the lifting column, allows the sliding seat and the inner arc grinder to perform linear reciprocating motion.

[0008] Preferably, the inner arc grinder includes a mounting plate, a guide wheel, a drive gear, a running motor, a grinding component, and a grinding wheel. Two mounting plates are provided, with a guide wheel and a drive gear rotatably mounted between the two mounting plates. The guide wheel and the drive gear are respectively fitted together with a sliding groove and a sliding seat. A running motor and a grinding component are mounted on one of the mounting plates, and the output end of the running motor is fixed to the drive gear. The output end of the grinding component is fixed to the grinding wheel on the outer side of the mounting plate.

[0009] Preferably, the sliding seat has a semi-circular structure, and its outer surface is provided with a set of gear teeth that mesh with the drive gear. The drive gear is located below the guide wheel, and the guide wheel and the sliding seat are rolled together in a sliding groove that runs through it. The sliding groove is an arc-shaped groove, and the drive gear and the guide wheel are allowed to move along the arc-shaped trajectory of the sliding groove and the sliding seat.

[0010] Preferably, the grinding wheel of the inner arc grinder is located above the space between two mirror-symmetrically arranged limiting plates, and the lug shaft fixedly installed on the limiting plates is engaged with the lug portion of the leaf spring.

[0011] Preferably, the outer end of the tufting shaft is provided with a thread that fits into the locking sleeve. After the locking sleeve is tightened with the tufting shaft, it can restrict and lock the inner leaf spring tufting part.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention employs a synergistic design of a semi-circular sliding seat and an arc-shaped groove, allowing the inner arc grinder to move along the arc-shaped trajectory of the leaf spring lug, achieving precise fit to the edge contour. For example, the drive gear meshes with the gear teeth on the outer surface of the sliding seat, and the grinding path can be precisely controlled by a servo motor, avoiding the problem of uneven local pressure caused by traditional straight-line grinding; the rolling engagement of the guide wheel and the groove ensures a smooth grinding process and significantly reduces burr residue.

[0014] This invention achieves high-precision linear reciprocating motion of the grinder through the linkage of a screw jack and a servo motor, and supports immediate grinding after sawing, reducing the number of clamping operations. For example, the equipment can automatically complete leaf spring positioning, grinding depth adjustment, and path planning without manual intervention; the threaded fastening design of locking the sleeve and the trunnion eliminates the gap between the leaf spring and the fixture, ensuring positional accuracy in multi-process machining.

[0015] This invention achieves rigid fixation of the leaf spring coil ear through a mirror-symmetrical limiting plate and locking sleeve design. For example, the structure of the coil ear shaft and the leaf spring coil ear fits together, and the threaded fastening of the locking sleeve effectively limits displacement during the grinding process; the arc-shaped trajectory design of the sliding seat and the slide groove further reduces the impact of vibration on machining accuracy and ensures the consistency of edge treatment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is another overall structural schematic diagram of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the inner arc grinder and sliding seat of this utility model.

[0019] In the picture:

[0020] Workbench 1, Frame 2, Lifting mechanism 3, Servo motor 4, Lifting platform 5, Lifting column 6, Sliding seat 7, Inner arc grinder 8, Mounting plate 81, Guide wheel 82, Drive gear 83, Running motor 84, Grinding component 85, Grinding wheel 86, Slide groove 9, Limiting plate 10, Roller shaft 11, Locking sleeve 12. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0023] As attached Figure 1 To be continued Figure 3 As shown:

[0024] This utility model provides an automotive leaf spring shearing edge grinding device, including a worktable 1, a frame 2, a lifting mechanism 3, a servo motor 4, a lifting platform 5, a lifting column 6, a sliding seat 7, an inner arc grinder 8, a slide groove 9, a limiting plate 10, a trunnion 11, and a locking sleeve 12. The worktable 1 is fixedly installed on the frame 2. The lifting mechanism 3 fixedly installed on the worktable 1 is equipped with the servo motor 4 and the lifting platform 5. The lifting platform 5 is fixedly connected to the sliding seat 7 through the lifting column 6. The sliding seat 7 is fitted with the inner arc grinder 8 in conjunction with the slide groove 9 that runs through it. The limiting plate 10 fixedly installed on the worktable 1 is provided with a trunnion 11, and the locking sleeve 12 is installed on the trunnion 11.

[0025] Furthermore, the lifting mechanism 3 installed on one side above the worktable 1 adopts a screw jack (SWL series optional). Its core transmission component is a high-strength alloy steel screw. The upper end of the screw is rigidly connected to the output end of the servo motor 4 (Panasonic MINASA 6 series optional) through a coupling, ensuring the synchronization and stability of power transmission. Ball nuts are fitted around the screw and are fixed to the nut seat at the bottom of the lifting platform 5 with bolts. At the same time, sliding columns are symmetrically arranged on both sides of the lifting mechanism 3. The sliding columns are slidably connected to the lifting platform 5 through linear bearings, forming a composite transmission structure. When the servo motor 4 rotates in the forward or reverse direction, the screw drives the lifting platform 5 to perform high-precision linear reciprocating motion along the sliding column through the ball nuts, and then drives the sliding seat 7 and the inner arc grinder 8 through the lifting column 6 to achieve vertical feed motion.

[0026] Furthermore, the inner arc grinder 8 consists of symmetrical mounting plates 81, guide wheels 82, drive gears 83, a running motor 84, grinding components 85, and grinding wheels 86. The two mounting plates 81 are fixedly connected by high-strength bolts to form a rigid frame, with the guide wheels 82 and drive gears 83 rotatably mounted in the middle via bearings. The outer circumference of the guide wheels 82 is covered with wear-resistant rubber, making rolling contact with the inner surface of the slide groove 9 (arc-shaped groove) to achieve low-friction movement. The drive gear 83 is an involute spur gear, its shaft end being fixed to the output shaft of the running motor 84 (optional Delta ECMA series) via a key connection. The running motor 84 is bolted to the outside of the left mounting plate 81. The grinding components 85 use a planetary gear reducer, with its input end connected to a servo motor and its output end rigidly fixed to the grinding wheel 86 via a flange. The grinding wheel 86 can be replaced with grinding wheels or fiber wheels of different grit sizes to adapt to different grinding precision requirements.

[0027] Furthermore, the sliding seat 7 is designed as a semi-circular structure, cast from ductile iron, with evenly distributed gear teeth (the tooth profile matches the drive gear 83) on its outer surface, forming an arc-shaped rack. An arc-shaped groove 9 (with a radius of curvature consistent with the curvature of the leaf spring itself) runs through the center of the sliding seat 7, and the inner wall of the groove 9 is ground. The guide wheel 82 is embedded in the groove 9 and rolls within it via bearings, bearing the radial load of the grinder. The drive gear 83 is located below the guide wheel 82 and meshes with the gear teeth on the outer surface of the sliding seat 7. When the motor 84 drives the gear to rotate, the gear and rack transmission converts the rotational motion into the arc-shaped trajectory motion of the sliding seat 7. This structure, through the dual positioning of "gear and rack guidance + groove rolling support," ensures that the inner arc grinder 8 moves precisely along the arc-shaped edge of the leaf spring lug, avoiding contour deviations caused by traditional linear motion.

[0028] Furthermore, two limiting plates 10 are fixed symmetrically in the middle of the worktable 1, with mounting holes on the inner side of the plates matching the trunnion 11. The trunnion 11 is a cylindrical structure made of 45# steel with a heat-treated surface. The length of the shaft is adapted to the spacing of the leaf spring trunnions, and both ends are machined with external threads. When the leaf spring is placed on the worktable 1, the trunnion holes at both ends are fitted into the trunnion 11, and the end face of the trunnion fits against the inner side of the limiting plate 10, forming axial positioning. The inner wall of the locking sleeve 12 is machined with internal threads that match the external threads of the trunnion 11, and the outer side of the sleeve is provided with anti-slip knurling for easy manual tightening. After the locking sleeve 12 is tightened, its inner end face is in close contact with the end face of the leaf spring trunnion, and the frictional torque restricts the circumferential rotation and axial movement of the leaf spring during the grinding process, ensuring positioning accuracy.

[0029] Furthermore, the threaded section at the outer end of the trunnion 11 is 50mm long, which, together with the internal threaded section of the locking sleeve 12, forms a high-strength mechanical connection. An annular groove is machined on the inner end face of the locking sleeve 12, with a rubber sealing ring embedded within it. When the sleeve is tightened, the sealing ring contacts the end face of the leaf spring trunnion, providing friction while preventing dust from entering the connection gap. The threaded pair adopts a fine-pitch design, which has higher self-locking performance compared to coarse-pitch threads. When used with anti-loosening washers, it can effectively prevent sleeve loosening caused by grinding vibration.

[0030] The working principle is as follows: First, place the leaf spring to be polished on the workbench 1, align the lug holes at both ends of the leaf spring with the lug shaft 11 on the limiting plate 10 and fit them in. The end face of the leaf spring lug is in contact with the inner side of the limiting plate 10 to achieve axial positioning. Then, rotate the locking sleeve 12. Through its cooperation with the external thread of the lug shaft 11, the inner end face of the locking sleeve 12 presses the leaf spring lug, and the friction torque locks the leaf spring to prevent circumferential rotation or axial movement during the polishing process.

[0031] Secondly, the servo motor 4 drives the screw of the lifting mechanism 3 to rotate, and the rotational motion is converted into the vertical linear motion of the lifting platform 5 through the ball nut pair. The lifting platform 5 drives the sliding seat 7 and the inner arc grinder 8 to rise and fall synchronously through the lifting column 6, so as to realize the vertical feed adjustment of the grinding wheel 86 to adapt to leaf springs of different thicknesses or curvatures.

[0032] Then, the motor 84 drives the drive gear 83 to rotate. Since the drive gear 83 meshes with the gear teeth (arc rack) on the outer surface of the sliding seat 7, and the guide wheel 82 is embedded in the arc groove 9 of the sliding seat 7 and rolls in contact with the groove wall, the gear and rack transmission pair converts the rotational motion into the movement of the inner arc grinder 8 along the arc trajectory of the groove 9, so that the grinding wheel 86 always fits the arc edge of the leaf spring lug.

[0033] Finally, the grinding component 85 drives the grinding wheel 86 to rotate at high speed (speed adjustable). Under the coordinated action of the arc-shaped trajectory movement of the sliding seat 7 and the vertical feed movement of the lifting mechanism 3, the sheared edge of the leaf spring is continuously ground. During the grinding process, the guide wheel 82 bears the radial load and ensures smooth movement. The servo motor 4 and the running motor 84 are linked through the control system to precisely control the movement trajectory and feed pressure of the grinding wheel 86, achieving uniform grinding of the arc-shaped edge, eliminating burrs and optimizing surface precision.

[0034] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A grinding device for the shearing edge of an automotive leaf spring, characterized in that, The system includes a workbench (1), a frame (2), a lifting mechanism (3), a servo motor (4), a lifting platform (5), a lifting column (6), a sliding seat (7), an inner arc grinder (8), a slide groove (9), a limiting plate (10), a trunnion (11), and a locking sleeve (12). The workbench (1) is fixedly installed on the frame (2). The lifting mechanism (3) fixedly installed on the workbench (1) is equipped with a servo motor (4) and a lifting platform (5). The lifting platform (5) is fixedly connected to the sliding seat (7) through the lifting column (6). The sliding seat (7) is equipped with an inner arc grinder (8) through a slide groove (9). The limiting plate (10) fixedly installed on the workbench (1) is equipped with a trunnion (11), and a locking sleeve (12) is installed on the trunnion (11).

2. The grinding equipment for the shearing edge of an automotive leaf spring as described in claim 1, characterized in that: The lifting mechanism (3) installed on one side above the workbench (1) is a screw jack. The upper end of the screw in the lifting mechanism (3) is fixed to the output end of the servo motor (4) fixedly installed on the outside of its own housing. In addition, the screw and the slide column in the lifting mechanism (3) are connected to the lifting platform (5) through ball nuts and linear bearings. The lifting mechanism (3) cooperates with the lifting platform (5) and the lifting column (6) to drive the sliding seat (7) and the inner arc grinder (8) to perform linear reciprocating motion.

3. The grinding equipment for the shearing edge of an automotive leaf spring as described in claim 2, characterized in that: The inner arc grinder (8) includes a mounting plate (81), a guide wheel (82), a drive gear (83), a running motor (84), a grinding component (85), and a grinding wheel (86). There are two mounting plates (81), and the guide wheel (82) and the drive gear (83) are rotatably mounted between the two mounting plates (81). The guide wheel (82) and the drive gear (83) are respectively fitted together with the slide groove (9) and the sliding seat (7). The running motor (84) and the grinding component (85) are mounted on one of the mounting plates (81). The output end of the running motor (84) is fixed to the drive gear (83). The output end of the grinding component (85) is fixed to the grinding wheel (86) on the outside of the mounting plate (81).

4. The automotive leaf spring shearing edge grinding equipment as described in claim 3, characterized in that: The sliding seat (7) has a semi-circular structure, and its outer surface is provided with a set of gear teeth that mesh with the drive gear (83). The drive gear (83) is located below the guide wheel (82), and the guide wheel (82) and the sliding seat (7) are rolled together in a sliding groove (9) that is opened through it. The sliding groove (9) is an arc-shaped groove, and the drive gear (83) and the guide wheel (82) are allowed to move along the arc-shaped trajectory of the sliding groove (9) and the sliding seat (7).

5. The grinding equipment for the shearing edge of an automotive leaf spring as described in claim 4, characterized in that: The grinding wheel (86) of the inner arc grinder (8) is located above the two mirror-symmetrically arranged limiting plates (10), and the lug shaft (11) fixedly installed on the limiting plate (10) is engaged with the lug part of the leaf spring.

6. The grinding equipment for the shearing edge of an automotive leaf spring as described in claim 5, characterized in that: The outer end of the tufting shaft (11) is provided with a thread that fits into the locking sleeve (12). After the locking sleeve (12) and the tufting shaft (11) are tightened, the inner leaf spring tufting part can be restricted and locked.

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