Numerical control double-face milling machine for hot coil spring end face processing

Abstract

The present application relates to spring processing technical field, specifically is related to a kind of for hot coiling spring end face processing numerical control double-sided milling machine, including milling machine bed, two milling main shaft boxes, milling cutter head and spring end face milling clamp, the spring end face milling clamp includes pedestal, support table, spring pressing mechanism, adopt the pressing piece and the synchronous pressing assembly of driving each pressing piece synchronous action of equidistant arrangement along the length direction of V-shaped support surface, make each pressing piece move along spring radial and independently abut on spring outer wall, while the working end of at least one pressing piece is equipped with embedded part, in the state of pressing, the embedded part is inserted into the helical groove between the adjacent spring coil of spring, effectively limit the sliding and compression deformation of spring along its own axis direction in the process of processing, solve the technical problems that spring end face processing needs twice clamping in the prior art, and spring is prone to sliding or compression deformation in the process of milling, and the machining precision is low.

Description

Technical Field

[0001] This invention relates to the field of spring processing technology, specifically to a CNC double-sided milling machine for machining the end faces of hot-rolled springs. Background Technology

[0002] In the field of mechanical manufacturing, hot-rolled springs are widely used in automotive suspension systems, railway locomotives, construction machinery, and heavy equipment due to their high load-bearing capacity and excellent fatigue resistance. To ensure the fitting accuracy and uniform force distribution of the springs during assembly, their two end faces usually need to be milled to eliminate unevenness at the ends and form a support plane perpendicular to the spring axis.

[0003] Currently, existing milling techniques for spring end faces generally suffer from the following technical defects: First, conventional milling machines can only process one end face of the spring. After milling one end, the spring must be disassembled, flipped, and re-clamped before milling the other end face. This process is not only cumbersome and time-consuming, but the secondary clamping also makes it difficult to ensure the parallelism between the two end faces and their perpendicularity to the axis, affecting machining accuracy. Second, hot-coiled springs are prone to sliding or axial compression deformation along their own axis during milling due to the cutting force. Because the spring itself is elastic, relying solely on V-blocks or ordinary clamping plates often fails to provide sufficient axial restraint, causing the spring to move during milling, affecting the end face machining quality, and even damaging the cutting tool. Third, traditional fixtures often cause unexpected compression deformation of the spring coil due to excessive clamping force, resulting in changes in the spring's free height after machining, affecting subsequent assembly and use.

[0004] Therefore, how to simultaneously complete the milling of both ends of a hot-rolled spring in a single clamping operation, and effectively limit the axial sliding and compression deformation of the spring during the processing, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the problems existing in the prior art, a CNC double-sided milling machine for machining the end faces of hot-rolled springs is provided. A spring end face milling fixture is set between two opposing milling spindle boxes. A support assembly with a V-shaped support surface supports the hot-rolled spring. Clamping plates arranged at equal intervals along the length of the V-shaped support surface and a synchronous clamping assembly driving the clamping plates to move synchronously allow each clamping plate to move radially along the spring and independently abut against the outer peripheral wall of the spring. Simultaneously, at least one clamping plate has an embedded part at its working end. Under pressure, this embedded part extends into a helical groove between adjacent spring coils, thereby achieving synchronous milling of both end faces of the spring in a single clamping operation. This effectively limits the spring's sliding and compression deformation along its own axis during machining, solving the technical problems of low machining accuracy due to the need for two clamping operations in the prior art, and the spring's tendency to slide or compress during milling.

[0006] To address the problems of existing technologies, this invention provides a CNC double-sided milling machine for machining the end face of a hot-coiled spring. The machine includes a milling bed, two milling spindle boxes disposed opposite each other on the machine bed, and milling cutter heads respectively mounted on the inner sides of the two milling spindle boxes. It also includes a spring end face milling fixture disposed on the milling bed and located between the two milling cutter heads. The spring end face milling fixture includes: a base disposed on the milling bed and located between the two milling spindle boxes; a support platform mounted on the base, the support platform having an upward-opening V-shaped support surface for supporting the outer peripheral wall of the hot-coiled spring; and a spring clamping mechanism, including a spring clamping mechanism along the V-shaped support surface. The device comprises clamping plates arranged at equal intervals along the length of a support surface, and a synchronous clamping assembly that drives each clamping plate to move synchronously. Under the drive of the synchronous clamping assembly, each clamping plate moves radially along the hot coil spring, and the working end of each clamping plate independently abuts against the outer peripheral wall of the hot coil spring. At least one of the clamping plates has an embedded part at its working end. When the clamping plate is pressing against the hot coil spring, the embedded part extends into the helical groove between adjacent spring coils of the hot coil spring to restrict the sliding and compression of the hot coil spring along its own axis during milling.

[0007] Preferably, there are two support platforms, located at both ends of the base; each support platform is equipped with a spring clamping mechanism; a spacing adjustment mechanism is connected between the two support platforms to adjust the relative distance between the two support platforms to accommodate hot-rolled springs of different lengths.

[0008] Preferably, the support platform has mounting grooves arranged at equal intervals along its length on both inclined surfaces of the V-shaped support surface. The bottom of the clamping plate extends into the mounting groove. The bottom of the clamping plate is provided with a rotating pivot and a driving pivot. The rotating pivot is rotatably connected to the groove wall of the mounting groove, and the driving pivot is drively connected to the synchronous clamping assembly.

[0009] Preferably, the support platform is provided with a mounting groove, and the synchronous pressing assembly further includes: two sliding blocks, which are slidably disposed in the mounting groove and arranged opposite to each other; a first bidirectional lead screw, which is rotatably disposed in the mounting groove, with its two ends passing through the two sliding blocks and threadedly connected to them; at least two elastic connecting members, which are disposed on the sliding blocks along the arrangement direction of the pressing plates and slide in cooperation with the sliding blocks, each elastic connecting member corresponding to each pressing plate, and the drive pivot is drivenly connected to the corresponding elastic connecting member.

[0010] Preferably, the top end of the sliding block is provided with a track parallel to its sliding direction, and the elastic connecting member includes: a connecting block slidably disposed on the track; a pressing connecting rod, the two ends of which are rotatably connected to the driving pivot and the connecting block respectively; and a first spring, the two ends of which are connected to the end of the connecting block and the track respectively.

[0011] Preferably, the two support platforms are slidably disposed on the base facing each other, and a drive seat is provided at the bottom end of each support platform. The spacing adjustment mechanism includes: a second bidirectional lead screw, which is rotatably disposed on the base, with its two ends passing through the drive seats at the bottom ends of the two support platforms and threadedly connected to them; and a second motor, which is disposed on the base and is drively connected to the second bidirectional lead screw.

[0012] Preferably, a worm sleeve is provided at the top of the mounting groove of the support platform, and a worm wheel coaxial with the first bidirectional lead screw is provided in the middle of the first bidirectional lead screw, and the worm sleeve meshes with the worm wheel; a drive shaft and a first motor for driving the drive shaft to rotate are provided on the base, and the drive shaft is splinedly connected to the worm sleeve.

[0013] Preferably, the spring end face milling fixture further includes an end positioning mechanism, which includes: a lifting side plate, which is slidably disposed on the opposite side of the two support platforms in a vertical direction; two lifting links, the two ends of each lifting link being rotatably connected to the lifting side plate and the corresponding sliding block respectively; and a positioning plate, which is slidably disposed on the outside of the lifting side plate along the axial direction of the hot coil spring, and an elastic reset member is disposed between the positioning plate and the lifting side plate.

[0014] Preferably, the elastic reset member includes: a connecting bolt, which is vertically disposed on the side of the lifting side plate and passes through the positioning plate and slides therewith; and a second spring, which is sleeved on the connecting bolt and located between the bolt cap of the connecting bolt and the positioning plate.

[0015] Preferably, the milling machine bed is further provided with a milling feed table that can move between the two milling spindle boxes. The base is slidably disposed on the milling feed table in the vertical direction. A lifting motor is disposed at the bottom end of the milling feed table, and the top end of the output shaft of the lifting motor is rotatably connected to the bottom of the base.

[0016] The advantages of this application compared to the prior art are:

[0017] This application achieves synchronous milling of both ends of a hot-rolled spring by using two milling spindle boxes arranged opposite each other and a fixture located between them. The machining of both ends can be completed in one clamping, avoiding the positioning errors caused by traditional double clamping, and greatly improving the parallelism of the two ends and the perpendicularity to the spring axis.

[0018] Meanwhile, the clamping plates are arranged at equal intervals along the length of the V-shaped support surface, and the multi-point independent clamping makes the clamping force evenly distributed along the spring axis, avoiding spring deformation caused by local overpressure.

[0019] The clamping plate with an embedded part clamps radially while the embedded part extends into the spiral groove to form an axial limit, constraining the spring from both radial and axial directions, effectively preventing axial sliding and compression deformation of the spring during milling.

[0020] The structure of each clamping plate acting independently can adapt to local shape errors or surface unevenness of the outer peripheral wall of the spring, ensuring that each clamping plate can reliably contact and apply clamping force, thus improving the adaptability of the clamp to different springs.

[0021] The combination of the V-shaped support surface and the clamping plate forms a stable radial positioning system, which ensures the rotational stability of the spring during processing and improves the surface quality and dimensional accuracy of the end face.

[0022] This double-sided milling machine optimizes the traditional two-clamping, step-by-step machining into a single clamping, simultaneous machining, which significantly shortens auxiliary time and improves production efficiency. It is particularly suitable for the end face finishing of large batches of hot coil springs. Attached Figure Description

[0023] Figure 1 This is a perspective view of a CNC double-sided milling machine for machining the end face of a hot-rolled spring according to the present invention.

[0024] Figure 2This is a perspective view of a spring end face milling fixture in a CNC double-sided milling machine for machining the end face of a hot-rolled spring, as described in this invention, from a first perspective.

[0025] Figure 3 This is a perspective view of a spring end face milling fixture in a CNC double-sided milling machine for machining the end face of a hot-rolled spring, as described in this invention, from a second perspective.

[0026] Figure 4 This is a perspective view of a spring end face milling fixture in a CNC double-sided milling machine for machining the end face of a hot-rolled spring, as described in this invention, from a third perspective.

[0027] Figure 5 This is a perspective view of a support table in a CNC double-sided milling machine for machining the end face of a hot-rolled spring, according to the present invention.

[0028] Figure 6 This is a side view of the support table in a CNC double-sided milling machine for machining the end face of a hot-rolled spring according to the present invention.

[0029] Figure 7 This is an exploded perspective view of an end-positioning mechanism for machining the end face of a CNC double-sided milling machine according to the present invention.

[0030] Figure 8 This is an exploded perspective view of a spring clamping mechanism in a CNC double-sided milling machine for machining the end face of a hot-rolled spring, according to the present invention.

[0031] Figure 9 This is an exploded perspective view of an elastic connector in a CNC double-sided milling machine for machining the end face of a hot-rolled spring, according to the present invention.

[0032] Figure 10 yes Figure 9 A magnified view of part A.

[0033] The numbers in the diagram are as follows: 1. Milling machine bed; 11. Milling table; 12. Lifting motor; 2. Milling spindle box; 3. Milling cutter head; 41. Base; 42. Support table; 421. Mounting slot; 422. Drive seat; 431. Clamping plate; 4311. Rotation pivot; 4312. Drive pivot; 432. Synchronous clamping assembly; 4321. Sliding block; 4322. Rail; 4323. First double-acting lead screw; 4324. Connecting block; 4325. Clamping connecting rod; 4326. First spring; 441. Second double-acting lead screw; 442. Second motor; 451. Worm sleeve; 452. Worm wheel; 453. First motor; 454. Drive shaft; 461. Lifting side plate; 462. Lifting connecting rod; 463. Positioning plate; 4641. Connecting bolt; 4642. Second spring. Detailed Implementation

[0034] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figures 1 to 5 As shown, a CNC double-sided milling machine for machining the end face of a hot-rolled spring includes a milling machine bed 1, two milling spindle boxes 2 oppositely disposed on the bed, and milling cutter heads 3 respectively mounted on the inner sides of the two milling spindle boxes 2. It also includes a spring end face milling fixture disposed on the milling machine bed 1 and located between the two milling cutter heads 3. The spring end face milling fixture includes: a base 41 disposed on the milling machine bed 1 and located between the two milling spindle boxes 2; a support platform 42 mounted on the base 41, the support platform 42 having an upward-opening V-shaped support surface for supporting the outer peripheral wall of the hot-rolled spring; and a spring clamping mechanism, including a spring clamping mechanism along the V-shaped support surface. The support surface has clamping plates 431 arranged at equal intervals along its length, and a synchronous clamping assembly 432 that drives each clamping plate 431 to move synchronously. Under the drive of the synchronous clamping assembly 432, each clamping plate 431 moves radially along the hot coil spring, and the working end of each clamping plate 431 independently abuts against the outer peripheral wall of the hot coil spring. At least one of the clamping plates 431 has an embedded part at its working end. When the clamping plate 431 is pressing against the hot coil spring, the embedded part extends into the helical groove between adjacent spring coils of the hot coil spring to limit the sliding and compression of the hot coil spring along its own axis during milling.

[0036] The CNC double-sided milling machine includes a milling machine bed 1, two milling spindle boxes 2 oppositely disposed on the milling machine bed 1, and milling cutter heads 3 respectively mounted on the inner sides of the two milling spindle boxes 2. It also includes a spring end-face milling fixture disposed on the milling machine bed 1 and located between the two milling cutter heads 3. The spring end-face milling fixture includes a base 41, a support table 42, and a spring clamping mechanism. The base 41 is disposed on the milling machine bed 1 and located between the two milling spindle boxes 2. The support table 42 is mounted on the base 41 and has an upward-opening V-shaped support surface for supporting the outer peripheral wall of the hot-rolled spring. The spring clamping mechanism includes a plurality of clamping plates 431 evenly spaced along the length of the V-shaped support surface, and a synchronous clamping assembly 432 that drives the clamping plates 431 to move synchronously. Driven by the synchronous clamping assembly 432, each clamping piece 431 moves radially along the hot coil spring, and the working end of each clamping piece 431 independently abuts against the outer peripheral wall of the hot coil spring. At least one clamping piece 431 has an embedded part at its working end, and when the clamping piece 431 is pressing against the hot coil spring, the embedded part extends into the helical groove between adjacent spring coils of the hot coil spring.

[0037] During operation, the clamping position is first adjusted according to the length and diameter of the hot-rolled spring, placing the spring on the V-shaped support surface of the support table 42, ensuring the outer peripheral wall of the spring is in contact with and supported by the V-shaped support surface. Then, the synchronous clamping assembly 432 is activated, driving each clamping plate 431 to move radially along the spring, so that the working end of each clamping plate 431 independently abuts against the outer peripheral wall of the spring. During this process, the clamping plate 431 with an embedded part automatically extends into the helical groove between adjacent spring coils while pressing against the spring, forming an axial limit. Because each clamping plate 431 moves independently, it can adapt to local shape changes in the outer peripheral wall of the spring, ensuring that each clamping plate 431 reliably contacts the spring. After clamping is completed, the two oppositely positioned milling spindle boxes 2 are activated, causing the two milling cutter discs 3 to feed synchronously, simultaneously milling the two end faces of the hot-rolled spring. During machining, the V-shaped support surface provides radial support, the clamping plate 431 provides radial clamping force, and the embedded part provides axial constraint through engagement with the spiral groove, effectively limiting the axial sliding and compression deformation of the spring under milling force. After machining, the synchronous clamping assembly 432 reverses the driving force to release the clamping plate 431, allowing the machined spring to be removed.

[0038] like Figure 3 and Figure 4 As shown, there are two support platforms 42, which are located at both ends of the base 41 respectively; each support platform 42 is equipped with a spring clamping mechanism; a spacing adjustment mechanism is connected between the two support platforms 42, which is used to adjust the relative distance between the two support platforms 42 to accommodate hot coil springs of different lengths.

[0039] Based on the length of the hot-rolled spring to be processed, the relative positions of the two support platforms 42 on the base 41 are adjusted using a spacing adjustment mechanism. The spacing adjustment mechanism drives the two support platforms 42 to move towards or away from each other, ensuring the spacing between them matches the spring length. After adjustment, both ends of the hot-rolled spring are placed on the V-shaped support surfaces of the two support platforms 42, providing stable support for both ends. Then, the spring clamping mechanism on each support platform 42 is activated to radially clamp and axially limit the two ends of the spring. After processing, the clamping mechanism is released, and the spring can be removed. When processing springs of different lengths is required, the spacing between the two support platforms 42 is adjusted again using the spacing adjustment mechanism, allowing for quick production changeover.

[0040] Two support platforms 42 support both ends of the spring, providing stable support for long hot-rolled springs during processing and preventing bending deformation or vibration caused by suspension. The spacing adjustment mechanism allows for flexible adjustment of the relative distance between the two support platforms 42. The same clamp can accommodate hot-rolled springs of various lengths, eliminating the need for dedicated clamps for each spring specification, significantly improving the equipment's versatility and economy. Each support platform 42 is independently equipped with a spring clamping mechanism, ensuring independent clamping force at both ends of the spring, with no interference between the clamping ends, guaranteeing uniform and reliable clamping.

[0041] like Figures 6 to 9 As shown, the support platform 42 has mounting grooves 421 arranged at equal intervals along its length on both inclined surfaces of the V-shaped support surface. The bottom of the clamping plate 431 extends into the mounting groove 421. The bottom of the clamping plate 431 is provided with a rotating pivot 4311 and a driving pivot 4312. The rotating pivot 4311 is rotatably connected to the groove wall of the mounting groove 421, and the driving pivot 4312 is drively connected to the synchronous clamping assembly 432.

[0042] The synchronous clamping assembly 432 applies driving force through the drive pivot 4312, causing the clamping plate 431 to swing around the rotation pivot 4311. The working end of the clamping plate 431 moves radially along the hot-rolled spring, gradually approaching and abutting against the outer peripheral wall of the spring. Since the clamping plate 431 is installed in the mounting groove 421 on both sides of the inclined surface of the V-shaped support surface, its swing trajectory is consistent with the radial direction of the spring, ensuring correct contact between the working end of the clamping plate 431 and the outer peripheral wall of the spring. Multiple clamping plates 431 are arranged at equal intervals along the length of the support platform 42, and swing synchronously under the drive of the synchronous clamping assembly 432, applying a uniform radial clamping force to the spring. The rotation pivot 4311 serves as a fulcrum, making the movement of the clamping plate 431 an oscillation rather than a translation, resulting in a simple structure and reliable movement.

[0043] The clamping plate 431 is rotatably connected to the wall of the mounting groove 421 via a pivot 4311, forming a lever-type swing structure. The driving force, input through the drive pivot 4312, acts as a fulcrum at the pivot 4311, amplifying the clamping force at the working end. The mounting grooves 421 are evenly spaced along the length of the V-shaped support surface, ensuring the clamping plates 431 are evenly distributed on the support platform 42. This results in a uniform distribution of the clamping force along the spring axis, preventing localized stress concentration. The bottom of the clamping plate 431 extends into the mounting groove 421, which provides spatial constraint and guidance for its movement, ensuring the accuracy of the clamping plate 431's trajectory during the swing process.

[0044] like Figures 3 to 4As shown, the support platform 42 is provided with a mounting groove 421. The synchronous pressing assembly 432 further includes: two sliding blocks 4321, which are slidably disposed in the mounting groove 421 and are disposed opposite to each other; a first bidirectional lead screw 4323, which is rotatably disposed in the mounting groove 421, with its two ends passing through the two sliding blocks 4321 and threadedly connected to them; at least two elastic connecting members, which are disposed on the sliding blocks 4321 along the arrangement direction of the pressing plates 431 and are slidably engaged with the sliding blocks 4321. Each elastic connecting member is disposed in one-to-one correspondence with each pressing plate 431. The drive pivot 4312 is drivenly connected to the corresponding elastic connecting member.

[0045] When the first bidirectional lead screw 4323 rotates, the two sliding blocks 4321 move synchronously towards or away from each other within the mounting groove 421 due to the opposite directions of their threads. As the sliding blocks 4321 move, they drive the elastic connecting members mounted on them to move synchronously. Each elastic connecting member, through a transmission connection with the drive pivot 4312, drives the corresponding clamping plate 431 to swing around the pivot 4311. Due to the bidirectional thread characteristic of the first bidirectional lead screw 4323, the two sliding blocks 4321 move in opposite directions, causing the clamping plates 431 on the inclined surfaces on both sides to swing synchronously towards the spring or to release synchronously, achieving symmetrical clamping. The elastic connecting members allow each clamping plate 431 to independently adapt to local shape changes in the outer peripheral wall of the spring, providing independent elastic compensation while ensuring synchronous action.

[0046] like Figure 9 and Figure 10 As shown, the top end of the sliding block 4321 is provided with a track 4322 parallel to its sliding direction. The elastic connector includes: a connecting block 4324, which is slidably disposed on the track 4322; a pressing connecting rod 4325, whose two ends are respectively rotatably connected to the driving pivot 4312 and the connecting block 4324; and a first spring 4326, whose two ends are respectively connected to the end of the connecting block 4324 and the end of the track 4322.

[0047] When the first bidirectional lead screw 4323 drives the sliding block 4321 to move, the sliding block 4321 drives the track 4322 and its connecting block 4324 to move synchronously. The connecting block 4324 pushes the drive pivot 4312 through the clamping link 4325, causing the clamping plate 431 to swing around the rotation pivot 4311, and its working end moves towards the spring. When the working end of the clamping plate 431 contacts the outer peripheral wall of the spring, if the sliding block 4321 continues to move, the connecting block 4324 slides backward along the track 4322 under the action of the counter-thrust of the clamping link 4325, while compressing the first spring 4326. The compression of the first spring 4326 determines the clamping force of the clamping plate 431 on the spring. The spring force is transmitted to the drive pivot 4312 through the clamping link 4325 and converted into a radial clamping force at the working end of the clamping plate 431. Since the elastic connecting parts corresponding to each clamping plate 431 are independent of each other, each clamping plate 431 can obtain different clamping forces according to the local shape of the spring surface, so as to achieve multi-point independent adaptive clamping.

[0048] like Figure 4 As shown, two support platforms 42 are slidably disposed on the base 41 facing each other. A drive seat 422 is provided at the bottom end of each support platform 42. The spacing adjustment mechanism includes: a second bidirectional lead screw 441, which is rotatably disposed on the base 41, with its two ends passing through the drive seats 422 at the bottom ends of the two support platforms 42 and threadedly connected to them; and a second motor 442, which is disposed on the base 41 and is drively connected to the second bidirectional lead screw 441.

[0049] The second motor 442 starts, driving the second bidirectional lead screw 441 to rotate around its axis. Because the threads at both ends of the second bidirectional lead screw 441 rotate in opposite directions, when the second bidirectional lead screw 441 rotates, the two drive seats 422 move synchronously towards each other or synchronously away from each other under the action of the threads, causing the two support platforms 42 to slide synchronously on the base 41. When a longer spring needs to be machined, the second motor 442 drives the second bidirectional lead screw 441 to move the two support platforms 42 away from each other, increasing the distance between them; when a shorter spring needs to be machined, the second motor 442 rotates in the opposite direction, causing the two support platforms 42 to move towards each other, decreasing the distance between them. After adjustment, due to the self-locking characteristic of the threaded engagement between the bidirectional lead screw and the drive seats 422, the two support platforms 42 can maintain their current position without the need for an additional locking device.

[0050] like Figures 3 to 5 As shown, a worm sleeve 451 is provided at the top of the mounting groove 421 of the support platform 42, and a worm wheel 452 coaxial with the first bidirectional lead screw 4323 is provided in the middle, and the worm sleeve 451 meshes with the worm wheel 452; a drive shaft 454 and a first motor 453 for driving the drive shaft 454 to rotate are provided on the base 41, and the drive shaft 454 is splinedly connected to the worm sleeve 451.

[0051] The first motor 453 starts, driving the drive shaft 454 to rotate. The drive shaft 454 drives the worm sleeve 451 to rotate synchronously via a spline connection. The worm sleeve 451 drives the first double-acting lead screw 4323 to rotate through meshing with the worm wheel 452. When the first double-acting lead screw 4323 rotates, the two sliding blocks 4321 move synchronously towards or away from each other in the mounting groove 421, driving the clamping plate 431 to swing through the elastic connector, thereby clamping or releasing the spring. When the spacing adjustment mechanism adjusts the relative position of the two support platforms 42, the worm sleeve 451 moves together with the support platform 42. The spline connection between the drive shaft 454 and the worm sleeve 451 allows them to slide axially relative to each other while maintaining power transmission, ensuring that power can always be transmitted to the first double-acting lead screw 4323.

[0052] like Figure 7 As shown, the spring end face milling fixture also includes an end positioning mechanism, which further includes: a lifting side plate 461, which is slidably disposed on the opposite side of the two support platforms 42 in the vertical direction; two lifting links 462, the two ends of each lifting link 462 being rotatably connected to the lifting side plate 461 and the corresponding sliding block 4321 respectively; and a positioning plate 463, which is slidably disposed on the outside of the lifting side plate 461 along the axial direction of the hot coil spring, and an elastic reset member is provided between the positioning plate 463 and the lifting side plate 461.

[0053] The positioning plate 463 has a vertical section connected to the lifting side plate 461 and an outwardly inclined section.

[0054] First, the hot-rolled spring is placed on the V-shaped support surface of the two support platforms 42. During placement, the positioning plate 463 extends to the end of the V-shaped support surface under the action of the elastic reset member. Its vertical section abuts against the spring end face, axially positioning the spring and ensuring that the spring end is in the accurate processing position. Its inclined section acts as a guide when the spring is placed, guiding the spring end smoothly into the positioning area. Subsequently, the synchronous clamping assembly 432 is activated. The first bidirectional lead screw 4323 drives the two sliding blocks 4321 to move in opposite directions. The sliding blocks 4321 drive the lifting side plate 461 to move downward through the lifting connecting rod 462. At the same time, the sliding blocks 4321 drive the clamping plate 431 to swing through the elastic connector, radially clamping the outer peripheral wall of the spring. As the sliding blocks 4321 continue to move towards each other, the lifting side plate 461 drives the positioning plate 463 to gradually descend. The positioning plate 463 disengages from the spring end, making the spring end face completely exposed. At the same time, the clamping plate 431 continues to press the spring, firmly fixing the spring to the V-shaped support surface. At this point, the ends of the spring are unobstructed, and the two opposing milling cutter discs 3 can simultaneously mill the two ends of the spring. After the machining is completed, the sliding block 4321 moves in opposite directions, the clamping plate 431 releases the spring, and at the same time, the lifting connecting rod 462 drives the lifting side plate 461 to rise. The positioning plate 463 extends again under the action of the elastic reset member, providing end face positioning for the next spring placement.

[0055] like Figure 7 As shown, the elastic reset component includes: a connecting bolt 4641, which is vertically disposed on the side of the lifting side plate 461 and passes through the positioning plate 463 and slides therethrough; and a second spring 4642, which is sleeved on the connecting bolt 4641 and located between the bolt cap of the connecting bolt 4641 and the positioning plate 463.

[0056] In the unclamped state, the second spring 4642 pushes the positioning plate 463 to slide outward along the connecting bolt 4641, causing the positioning plate 463 to extend to the end of the V-shaped support surface and abut against the spring end face for positioning. When the lifting side plate 461 descends, the positioning plate 463 moves downward accordingly. If the positioning plate 463 contacts the spring or other components, it can overcome the elastic force of the second spring 4642 and slide inward along the connecting bolt 4641 to avoid a hard collision; at the same time, the second spring 4642 is compressed, storing elastic potential energy. When the lifting side plate 461 rises and resets, the second spring 4642 releases its elastic potential energy, pushing the positioning plate 463 to extend outward again, returning to the positioning state.

[0057] like Figure 1 and Figure 2As shown, the milling machine bed 1 is also provided with a milling feed table 11 that can move between the two milling spindle boxes 2. The base 41 is slidably disposed on the milling feed table 11 in the vertical direction. A lifting motor 12 is provided at the bottom end of the milling feed table 11. The top end of the output shaft of the lifting motor 12 is rotatably connected to the bottom of the base 41.

[0058] Depending on the diameter of the hot-rolled spring to be processed, the lifting motor 12 is started. The output shaft of the lifting motor 12 rotates and drives the base 41 to rise and fall vertically, raising or lowering the support platform 42 and V-shaped support surface on the base 41 to a suitable height, ensuring that the central axis of the hot-rolled spring is aligned with the central axes of the two milling cutter discs 3. After adjustment, the lifting motor 12 stops, and the base 41 remains at the set height. Subsequently, the milling table 11 moves the entire fixture towards the milling spindle box 2, sending the hot-rolled spring to the processing position between the two milling cutter discs 3. After processing one end, the milling table 11 can continue to move or retract, facilitating loading / unloading or adjusting the processing position.

[0059] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A CNC double-sided milling machine for machining the end faces of hot-rolled springs, comprising a milling machine bed, two milling spindle boxes disposed opposite each other on the bed, and milling cutter heads respectively mounted on the inner sides of the two milling spindle boxes, characterized in that, It also includes a spring-face milling fixture disposed on the milling machine bed and located between the two milling cutter heads, the spring-face milling fixture comprising: A base is disposed on the milling machine bed and located between the two milling spindle boxes; A support platform is installed on the base. The support platform has an upward-opening V-shaped support surface for supporting the outer peripheral wall of the hot-rolled spring. The spring clamping mechanism includes clamping plates arranged at equal intervals along the length direction of the V-shaped support surface, and a synchronous clamping assembly that drives each clamping plate to move synchronously. Driven by the synchronous clamping assembly, each clamping plate moves radially along the hot coil spring, and the working end of each clamping plate independently abuts against the outer peripheral wall of the hot coil spring; at least one of the clamping plates has an embedded part at its working end. When the clamping plate is pressing against the hot coil spring, the embedded part extends into the helical groove between adjacent spring coils of the hot coil spring to restrict the sliding and compression of the hot coil spring along its own axis during milling.

2. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to claim 1, characterized in that, Two support platforms are provided, located at opposite ends of the base; each support platform is equipped with a spring clamping mechanism; a spacing adjustment mechanism is connected between the two support platforms to adjust the relative distance between them to accommodate hot-rolled springs of different lengths.

3. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to claim 2, characterized in that, The support platform has mounting grooves arranged at equal intervals along its length on both inclined surfaces of the V-shaped support surface. The bottom of the clamping plate extends into the mounting groove. The bottom of the clamping plate is provided with a rotating pivot and a driving pivot. The rotating pivot is rotatably connected to the groove wall of the mounting groove, and the driving pivot is drively connected to the synchronous clamping assembly.

4. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to claim 3, characterized in that, The support platform is provided with an installation groove, and the synchronous clamping assembly further includes: Two sliding blocks are slidably disposed within the mounting slot and are positioned opposite to each other. The first bidirectional lead screw is rotatably disposed in the mounting groove, with its two ends passing through the two sliding blocks and threadedly connected to them; At least two elastic connectors are disposed on the sliding block along the arrangement direction of the clamping plates and slide in cooperation with the sliding block. Each elastic connector is disposed in one-to-one correspondence with each clamping plate, and the drive pivot is connected to the corresponding elastic connector in a transmission manner.

5. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to claim 4, characterized in that, The top of the sliding block is provided with a track parallel to its sliding direction, and the elastic connecting member includes: The connecting block is slidably mounted on the track; The clamping link is rotatably connected at both ends to the drive pivot and the connecting block, respectively. The first spring has its two ends connected to the connecting block and the end of the track, respectively.

6. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to any one of claims 2-5, characterized in that, Two support platforms are slidably disposed on the base facing each other, and a drive seat is provided at the bottom end of each support platform. The spacing adjustment mechanism includes: The second bidirectional lead screw is rotatably mounted on the base, and its two ends pass through the drive seats at the bottom of the two support platforms and are threadedly connected to them. The second motor is mounted on the base and is connected to the second bidirectional lead screw drive.

7. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to claim 6, characterized in that, The top of the mounting groove of the support platform is provided with a worm sleeve, and the middle of the first bidirectional lead screw is provided with a worm wheel coaxial with it. The worm sleeve meshes with the worm wheel. The base is provided with a drive shaft and a first motor for driving the drive shaft to rotate. The drive shaft is splinedly connected to the worm sleeve.

8. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to claim 4 or 5, characterized in that, The spring end face milling fixture further includes an end positioning mechanism, and the end positioning mechanism further includes: The lifting side plate is slidably disposed on the opposite side of the two support platforms in a vertical direction; Two lifting links, each of which is rotatably connected at both ends to the lifting side plate and the corresponding sliding block; A positioning plate is slidably disposed on the outside of the lifting side plate along the axial direction of the hot coil spring, and an elastic reset member is disposed between the positioning plate and the lifting side plate.

9. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to claim 8, characterized in that, The elastic reset element includes: A connecting bolt is vertically disposed on the side of the lifting side plate and passes through the positioning plate and slides therewith; The second spring is sleeved on the connecting bolt and located between the bolt cap and the positioning plate.

10. A CNC double-sided milling machine for machining the end face of a hot-rolled spring according to any one of claims 1-5, characterized in that, The milling machine bed is also provided with a milling feed table that can move between the two milling spindle boxes. The base is slidably mounted on the milling feed table in the vertical direction. A lifting motor is provided at the bottom end of the milling feed table. The top end of the output shaft of the lifting motor is rotatably connected to the bottom of the base.

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