Hot roll forming machine for automobile leaf spring

Abstract

The application discloses a hot roll forming machine for automobile plate spring, which mainly comprises a rack, a roll support, a roll system, a driving mechanism, a transmission mechanism and a pressure roller group adjusting mechanism. The roll system comprises multiple groups of pressure rollers, each group of pressure rollers has at least upper and lower pressure rollers which are parallel to each other and have a matching gap, the multiple groups of pressure rollers are arranged in sequence to form an arc shape, and the upper and lower pressure rollers in the multiple groups of pressure rollers form an arc-shaped roll channel. The middle part of the lower pressure roller of each group of pressure rollers is concave inwardly to form a roll groove. The hot roll forming machine for automobile plate spring adjusts the roll gap and the arc by using a servo motor, workers only need to input the thickness and the curvature radius of the plate spring into the computer, the positions of the rollers can be automatically adjusted, the spring flat steel automatically enters the equipment through a roller way, the operation is simple, the equipment is a through type, the arc radius of the product is more uniform than that of the traditional hot forming, the arc height tolerance is smaller, and the production efficiency is several times of that of the traditional hot forming of the automobile plate spring.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile leaf spring rolling process, and particularly relates to a one-off hot rolling forming machine for automobile leaf spring. BACKGROUND

[0002] The traditional equal cross-section leaf spring is hot-pressed and formed by a quenching machine during quenching, and a sample plate worker needs to manually make a sample plate first, and then adjusts the quenching machine according to the sample plate, and then hot-presses and forms, and the product curvature completely depends on the level of the sample plate worker, the hot-pressing forming speed is slow, and the efficiency is low. For example, the "automobile leaf spring" with the publication number CN 207777494 U comprises a main spring, upper auxiliary springs, lower auxiliary springs and ears located on both sides of the main spring, the inner sides of the ears at both ends of the main spring are respectively provided with clamps, the first gasket is arranged between the main spring and the clamp, the center of the first gasket is provided with a positioning hole, the end is provided with a limiting part, the included angle between the limiting part and the first gasket is greater than 90 degrees, and the limiting groove is arranged on the limiting part. The main spring, the upper auxiliary spring and the lower auxiliary spring are locked together through the intermediate bolt and the locking nut, the shock-absorbing blocks are fixed on both sides of the upper auxiliary spring and the lower auxiliary spring by the fastening bolts. The patent technology is a traditional hot-pressing forming process which needs a sample plate and a corresponding mold, the product curvature is not easy to adjust, the mold must be replaced when adjusting, the product curvature completely depends on the level of the sample plate worker, the hot-pressing forming speed is slow, each single piece is processed at a time, continuous circulation cannot be realized, the efficiency is low, and further, the heat energy loss is large. The automobile leaf spring is generally composed of a plurality of alloy spring steels with different lengths, and is combined into a group of approximately equal-strength spring beams. When the leaf spring is stressed, the leaf spring pieces are closely attached to each other, and the equal-stiffness leaf spring has linear properties, the difference between the empty load, full load and overload frequencies is large, and the mutual friction between the leaf spring pieces when being stressed and bent will generate abnormal sound and affect the service life of the whole vehicle. In the traditional automobile leaf spring quenching process, the stamping mode of the mold also needs to ensure the curvature matching precision between the leaf spring pieces of each group, and further increases the design difficulty of each mold.

[0003] To address the shortcomings of traditional automotive leaf spring quenching and forming methods, the "Automotive Leaf Spring Assembly Quenching and Forming Device" (publication number CN 207347630 U) describes a device where a lower forming die is fixed on a supporting beam at the bottom of the main frame. An automatic feeding mechanism is installed on the supporting beam corresponding to the lower forming die. Length positioning mechanisms are located on both sides of the main frame corresponding to the lower forming die, and a width positioning mechanism is located on the back of the main frame corresponding to the lower forming die. A central clamping mechanism is positioned directly above the lower forming die. The top of the central clamping mechanism passes through a central guide sleeve in the middle of the movable upper die assembly and connects to a central clamping cylinder. Side clamping cylinders are fixed on both sides of the main frame on either side of the central clamping cylinder, and these side clamping cylinders are connected to both ends of the movable upper die assembly, which cooperates with the lower forming die. While this technical solution allows for adjustment of the curvature of the upper die assembly through its movable and adjustable upper die assembly, the lower die does not have a curvature adjustment function. This technology still uses a stamping method, which cannot achieve continuous processing. The upper die assembly has many components and a large adjustment range, increasing the difficulty of adjustment and maintenance costs. Summary of the Invention

[0004] In view of the defects and problems of traditional automotive leaf spring rolling processes and rolling equipment, this invention provides an automotive leaf spring hot rolling forming machine that can automatically form rolling channels for automotive leaf springs by inputting corresponding roller gap and curvature parameters according to different design requirements, and can realize continuous rolling operations.

[0005] The solution to the technical problem of this invention is to use an automotive leaf spring hot roll forming machine, which mainly includes a frame, a roll forming support, a pressure roller system, a drive mechanism (pressure roller rotation drive), a transmission mechanism (pressure roller rotation transmission), and a pressure roller group adjustment mechanism, etc.

[0006] The pressure roller system comprises multiple sets of pressure rollers. Each set has at least two parallel upper and lower pressure rollers with a clearance between them. These sets of rollers are arranged sequentially to form an arc shape, creating an arc-shaped rolling channel between the upper and lower rollers. Each set of rollers has an inwardly recessed rolling groove in the center of the lower pressure roller. The function of the rolling groove is to prevent the leaf spring from bending during its movement, thus straightening any leaf springs that may bend.

[0007] The two ends of multiple sets of pressure rollers are respectively mounted in the corresponding bearing boxes on the rolling support through bearings, and each pressure roller is connected to the drive mechanism through a transmission mechanism.

[0008] The pressure roller assembly is equipped with a pressure roller adjustment mechanism that drives the bearing boxes at both ends of each pressure roller to move vertically.

[0009] The adjusting mechanism here includes at least one form: the bearing boxes at both ends of the multiple sets of compression rollers are respectively installed in the corresponding vertical slides on both sides of the rolling support, and the lifting adjusting devices are installed on the upper side or lower side of the corresponding bearing boxes. The position of the bearing at the shaft end of each compression roller is adjusted and positioned by using each lifting adjusting device, and then the height of each compression roller is determined, that is, the matching gap thickness between each set of compression rollers and the arc of the arc rolling channel is determined.

[0010] The power part for controlling the adjusting mechanism of the compression roller set can be installed with a servo motor (or a stepping motor) at the top or bottom of the vertical slide, and the servo motor is controlled to rotate by the controller (PLC) according to the input roller gap and arc parameters (the controller is connected with button input and display output), thereby driving the lifting movement of each bearing box (for example, by rotating the screw rod to drive the lifting movement of the nut seat).

[0011] Another implementation for driving the lifting in the adjusting mechanism of the compression roller set is to install a worm gear box at the top or bottom of the vertical slide, the inner end of the vertical lifting rod at the output end of the worm gear box is fixedly connected with the bearing box part, the worm shaft at the input end of the worm gear box is connected with a servo motor, the worm gear is engaged, and the corresponding vertical lifting rod is driven to lift and move by the controller controlling the rotation of each servo motor, thereby driving the lifting movement of each bearing box.

[0012] There are two forms, the first form is that the worm and the worm gear are engaged, the worm is the input end, the worm gear is the output end, the worm shaft is a hollow shaft, a lifting rod is matched and sleeved in the shaft cavity of the worm shaft, and the lifting rod is spline-sleeved between the worm shaft cavity, and the two can only be axially lifted and cannot be relatively rotated. The lower segment of the lifting rod is a threaded segment, the outer thread of which is connected with a pressing nut, and the pressing nut is fixed in the vertical sliding of the rolling support, so that the lifting rod can automatically lift and move when it rotates. The lower end of the lifting rod is rotationally connected with the corresponding lifting bearing box. The second form is that the worm and the worm gear are engaged, the worm is the input end, the worm gear is the output end, and the worm shaft is connected with a lifting rod (tube) through threads, and the lower end of the lifting rod is fixed to the end face of the corresponding lifting bearing box.

[0013] The automobile plate spring hot roll forming machine further comprises a feeding clamping mechanism arranged at the feeding end. The feeding clamping mechanism comprises a squeezing roller set composed of an upper roller and a lower roller, the upper roller and the lower roller have a clamping gap therebetween, the upper roller and the lower roller are installed in a vertical slot through bearings and bearing boxes at both ends, and the upper bearing box and the lower bearing box can be adjusted vertically. A spring chamber is arranged at the upper side of the vertical slot, and a guide rod is installed in the spring chamber, the guide rod is sleeved with a thrust spring outside, and the lower end of the thrust spring is supported on the surface of the upper roller bearing box. A guide device is arranged in front of the clamping gap, and the guide device is installed on both sides of the roll pressing support through guide ports. Vertical strip-shaped holes are arranged on both sides of the guide ports to adjust the height of the guide device, for example, fixed pins and lock nuts are arranged on the roll pressing support, the vertical strip-shaped holes are sleeved with the fixed pins outside, and can be fixed by the lock nuts after being adjusted vertically. Horizontal movement adjustment grooves are arranged on the guide ports, and corresponding guide devices are installed on each horizontal movement adjustment groove through bolts, and can be adjusted left and right; the guide device comprises a concave guide groove in the middle, and the groove of the guide groove is tapered, which is used for guiding the plate spring.

[0014] The automobile plate spring hot roll forming machine adopts a servo motor to adjust the roll gap and the curvature, workers only need to input the plate spring thickness and the curvature radius into the computer, each roller can automatically adjust the position, the spring flat steel automatically enters the equipment through the roller way, the operation is simple, the equipment is a through type, the product curvature is more uniform than the traditional hot pressing forming, the camber tolerance is smaller, and the production efficiency is greatly improved, and the production efficiency is several times of that of the traditional automobile plate spring hot pressing forming. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of the whole machine of the present application.

[0016] Figure 2 is Figure 1 a left view of the whole machine.

[0017] Figure 3 is Figure 1 a rear view of the whole machine.

[0018] Figure 4 is a second perspective view of the whole machine of the present application.

[0019] Figure 5 is a schematic view of the arrangement state of the pressing roller set.

[0020] Figure 6 is a control mode block diagram.

[0021] Figure 7 is a regulation structure diagram of the pressing roller set regulation mechanism.

[0022] The figure mark: 1-motor, 2-reducer, 3-multi-shaft gear box, 4-universal coupling, 5-servo motor, 6-worm gear box, 61-worm wheel, 62-worm, 63-worm shaft, 7-press roller, 71-upper press roller, 72-lower press roller, 73-rolling ring groove, 8-frame, 9-rolling support, 10-coupling, 11-motor base, 12-vertical slide, 13-sliding block, 14-lifting rod, 15-bearing box, 16-cover plate, 17-extrusion roller group, 18-guide rod, 19-thrust spring, 20-guide device, 21-thread segment, 22-rotary joint, 23-pressing nut. DETAILED DESCRIPTION

[0023] The application is further illustrated below in combination with the drawings and examples.

[0024] Example 1: the hot rolling forming machine for automobile leaf spring as shown in Figure 1 and Figure 3 , which comprises a frame 8 and a rolling support 9 fixed at the rear end of the frame 8. A motor 1, a reducer 2, a multi-shaft gear box 3 are sequentially installed on the frame 8 from front to rear. The motor shaft is connected to the input end of the reducer 2 through a coupling, and the output end of the reducer 2 is connected to the input end of the multi-shaft gear box 3 through a coupling. The multiple output ends of the multi-shaft gear box 3 are respectively connected to the input ends of corresponding press rollers 7 through corresponding universal couplings 4.

[0025] As can be seen from Figure 2 and Figure 5 , the press roller system comprises multiple groups of press rollers 7, each group of press rollers 7 has at least upper and lower press rollers 71 and 72 parallel to each other and with a matching gap. The multiple groups of press rollers are sequentially arranged to form an arc shape, and the upper and lower press rollers in the multiple groups of press rollers form an arc-shaped rolling channel. Further, there is a rolling ring groove 73 recessed inward in the middle of the lower press roller of each group of press rollers. Since there are multiple lower press rollers, each lower press roller contains a rolling ring groove 73, so that the multiple rolling ring grooves 73 cooperate to form a groove channel, which can prevent the leaf spring from bending sideways during rolling. For leaf springs with side bending (part of the leaf springs are straight in the cooling state due to uneven heating factors), the rolling channel has a straightening effect.

[0026] As can be seen from Figure 1 and Figure 2In this system, the two ends of multiple sets of pressure rollers are respectively mounted on the roller bearing bracket 9 within corresponding bearing housings 15 via bearings. Each bearing housing 15 contains a cooling channel into which circulating cooling water is injected. When each pressure roller is operating, the circulating cooling water continuously cools the corresponding bearing housing, ensuring reliable operation of each pressure roller. An adjustment mechanism is also provided to drive the vertical movement of the bearing housings 15 at both ends of each pressure roller. Specifically, the bearing housings 15 at both ends of the multiple sets of pressure rollers are respectively installed in corresponding vertical slides 12 on both sides of the roller bearing bracket 9, and lifting adjustment devices are installed on the upper or lower side of each bearing housing 15. These lifting adjustment devices are used to adjust and position the bearing position at the shaft end of each pressure roller, thereby determining the height of each pressure roller, and thus the fitting clearance thickness between each set of pressure rollers.

[0027] In this embodiment, the lifting adjustment device consists of a worm gear box 6 installed at the top or bottom of the vertical slide 12. A bearing housing component is fixedly connected to the inner end of the vertical lifting rod 14, which is connected to the worm gear shaft. A servo motor 5 is connected to the worm shaft 63, and the servo motor 5 is fixed to one side of the rolling support 9 via a motor mount 11. The worm gear 61 meshes with the worm 62. The control section includes computer programming, using computer software as a parameter input and control output device to control each servo motor 5 to rotate according to the parameter values. The automotive leaf spring hot rolling forming machine uses servo motors 5 to adjust the roller gap and curvature. The worker only needs to input the leaf spring thickness and radius of curvature into the computer, and each roller can automatically adjust its position. The spring flat steel automatically enters the equipment through the roller conveyor.

[0028] This embodiment also includes a feeding clamping mechanism at the feeding end, such as... Figure 3 and Figure 4 As shown, the pushing mechanism includes a feeding roller group 17 consisting of a pair of upper and lower rollers. There is a clamping gap between the upper and lower rollers. The two ends of the upper and lower rollers are installed in a vertical groove through bearings and bearing boxes 15. The upper and lower bearing boxes 15 can be adjusted vertically.

[0029] As shown in the figure, a spring chamber is located on the upper side of the vertical groove, and a guide rod 18 is installed inside the spring chamber. A thrust spring 19 is fitted on the outside of the guide rod 18, and the lower end of the push-pull spring is supported on the surface of the upper roller bearing box 15. Furthermore, a guide device 20 is provided directly in front of the clamping gap, and its two sides are installed on both sides of the rolling support 9 through the guide ports. Vertical strip holes are provided on the guide ports on both sides to adjust the height of the guide device 20. For example, a fixing bolt and a lock nut are provided on the rolling support 9, and the vertical strip holes are fitted on the outside of the fixing bolt so that they can be fixed by the lock nut after the upgrade adjustment.

[0030] In use, the motor 1 is kept rotating to drive the speed reducer 2, the multi-shaft gearbox 3, the input end of the plurality of universal couplings 4, the output end of the plurality of universal couplings 4, and the corresponding compression rollers. The thickness and curvature radius parameters of the leaf spring are input into the computer (or the thickness and curvature radius parameters are input into the PLC through the buttons, and the corresponding parameters are displayed on the display on the rack 8), the computer outputs or the PLC outputs control the corresponding number of rotations and angles of each servo motor 5 according to the set rotation, the input end of the worm and gear box 6 is connected to the servo motor 5, the worm is used as the input end, the worm wheel 61 is used as the output end, the worm shaft is a hollow shaft, the lifting rod 14 is matched and sleeved in the shaft cavity of the worm shaft, and the lifting rod 14 is spline-sleeved between the worm shaft cavity, so that the lifting rod 14 can only be axially lifted and lowered but cannot be rotated relative to the worm shaft. The lower section of the lifting rod 14 is a threaded section 21, the outside of the threaded section 21 is threadedly connected with a pressing nut, the pressing nut is fixed in the vertical sliding inner side of the rolling support 9, so that the lifting rod 14 can be automatically lifted and moved when the lifting rod 14 is rotated. The lower end of the lifting rod 14 is rotationally connected with the corresponding lifting bearing box 15 (or through the sliding block 13). Thus, the automatic adjustment of each roller is realized, and the rolling gap and curvature are set. The hot spring flat steel blank is automatically fed into the equipment through the extrusion roller group 17 of the feeding mechanism by the guide device 20, and the hot spring flat steel blank forms a set arc shape after passing through the arc rolling channel. The plurality of rolling ring grooves 73 cooperatively form a groove channel, which can prevent the leaf spring from being laterally bent during the feeding process, and has a straightening effect on the leaf spring with lateral bending. The device is simple to operate, and the working process is through type. The product arc is more uniform than the traditional hot pressing forming, the arc height tolerance is smaller, and the production efficiency is high.

[0031] In example 2, the pulse data provided to each servo motor 5 is controlled by the PLC controller to drive the corresponding vertical lifting rod 14 to move up and down, and then drive each bearing box to move up and down. The signal input end of the PLC controller can be connected with a digital keyboard, and the signal output end can be connected with a display. After the PLC controller is programmed, the corresponding parameters are input into the PLC controller through the digital keyboard, and the PLC controller will automatically provide the rotation data of each servo motor 5 according to the parameters, as shown in FIG. 2. According to the leaf spring process, the thickness and curvature radius of the leaf spring are input, the servo motor 5 drives the worm and gear box 6 to drive the compression roller to adjust up and down to form the required arc of the product, the main motor 1 drives the compression roller to rotate through the speed reducer 2, the multi-shaft gearbox 3, and the universal coupling 4, and the heated spring flat steel is sent into the compression roller through the roller, and the required arc of the leaf spring is rolled out at one time. Figure 6

[0032] ​Example 3: Based on example 1, the lifting adjustment device can also be that servo motors 5 (or stepper motors) are installed at the top or bottom of the vertical slide 12, and the rotation of each servo motor 5 is controlled by the controller to drive the lifting movement of each bearing box. For example, the rotation of the screw drives the lifting movement of the nut seat.

[0033] Example 4: Based on example 1, the lifting adjustment device can also be that servo hydraulic cylinders are installed at the top or bottom of the vertical slide 12, and the advance and retreat of each servo hydraulic cylinder is controlled by the controller to drive the lifting movement of each bearing box.

[0034] Example 5: Based on example 1, the driving mode for lifting in the press roller group adjustment mechanism is to install a worm gear box 6 at the top or bottom of the vertical slide 12. The inner end of the vertical lifting rod 14 at the output end of the worm gear box 6 is fixedly connected to the bearing box part, and the worm shaft 63 at the input end of the worm gear box 6 is connected with a servo motor 5. The worm gear engages, and the rotation of each servo motor 5 is controlled by the controller to drive the lifting movement of the corresponding vertical lifting rod 14, thereby driving the lifting movement of each bearing box. As shown in Figure 7 The worm engages with the worm gear, the worm serves as the input end, the worm gear serves as the output end, the worm shaft is a hollow shaft, the lifting rod 14 is matched and fitted in the shaft cavity of the worm shaft, and the lifting rod 14 is spline-fitted between the worm shaft cavity, and the two can only be axially lifted but cannot be relatively rotated. The lower segment of the lifting rod 14 is a threaded segment 21, the outer side of which is threadedly connected with a press-down nut 23, and the press-down nut is fixed in the vertical sliding inner side of the rolling support 9, so that the lifting rod 14 can automatically lift and move when it rotates. The lower end of the lifting rod 14 is rotationally connected with the corresponding lifting bearing box.

Claims

1. A hot roll forming machine for automotive leaf springs comprising a frame, a drive mechanism, a transmission mechanism, a roll system and a controller, characterised in that, The rolling system comprises multiple groups of pressure rollers, each group of pressure rollers having at least upper and lower pressure rollers parallel to each other and having a matching gap, and the multiple groups of pressure rollers are arranged and combined in sequence to form an arc shape, and an arc-shaped rolling channel for hot rolling forming of the automobile plate spring is formed between the upper and lower pressure rollers; both ends of the multiple groups of pressure rollers are respectively installed in corresponding bearing boxes in the rolling support through bearings, each pressure roller is respectively connected to a driving mechanism through a transmission mechanism, a motor, a speed reducer and a multi-shaft gear box are sequentially installed on the frame from front to back, the rotating shaft of the motor is connected to the input end of the speed reducer through a coupling, the output end of the speed reducer is connected to the input end of the multi-shaft gear box through a coupling, and multiple output ends of the multi-shaft gear box are respectively connected to corresponding input ends of the pressure rollers through universal couplings to form a complete driving transmission chain. A cooling channel is arranged in the bearing box to continuously cool the bearing box by injecting circulating cooling water, so as to adapt to the high-temperature working condition of hot rolling and ensure reliable operation of the pressure roller. An adjusting mechanism for driving the bearing boxes at both ends of each pressure roller to move vertically is arranged, the adjusting mechanism comprises the bearing boxes installed in corresponding vertical slides on both sides of the rolling support, and lifting adjusting devices located on the upper side or the lower side of the bearing boxes, the position of the bearing at the shaft end of each pressure roller is adjusted and positioned by using each lifting adjusting device, and then the matching gap thickness between each group of pressure rollers and the arc of the arc-shaped rolling channel are determined. A feeding clamping mechanism is arranged at the feeding end, the feeding clamping mechanism comprises a feeding roller group composed of a pair of upper and lower rollers, there is a clamping gap between the upper and lower rollers, and the upper and lower rollers are installed in corresponding vertical grooves on both sides of the feeding end of the rolling support through bearings and bearing boxes, the upper or lower bearing box can be adjusted vertically, a spring chamber is arranged on the upper side of the vertical groove, a guide rod is installed in the spring chamber, and a thrust spring is sleeved on the outside of the guide rod, the lower end of the thrust spring is supported on the surface of the upper roller bearing box to adapt to the thickness fluctuation of the hot plate spring and ensure stable clamping and feeding. A guide device is arranged in front of the clamping gap of the feeding roller group, and the guide device is installed on both sides of the rolling support through guide ports, a vertical strip-shaped hole and a transverse adjustment groove are arranged on the guide port, the height of the guide device is adjusted through a fixed bolt and a lock nut, the left and right of the guide device is adjusted through a bolt, the guide device comprises a concave guide groove in the middle, the groove of the guide groove is tapered, and the guide groove is used for precise guiding and importing of the hot spring flat steel. The middle part of the lower pressure roller of each group of pressure rollers has an inwardly recessed rolling ring groove, and multiple rolling ring grooves cooperate to form a groove channel, which can prevent side bending of the plate spring during feeding and can straighten the plate spring with side bending. The controller controls the power mechanism of the lifting adjusting device according to the input parameters of the thickness and the curvature radius of the plate spring, and then drives the lifting of each bearing box to realize automatic adjustment and adaptation of the arc-shaped rolling channel.

2. The automotive leaf spring hot roll forming machine according to claim 1, wherein A feeding clamping mechanism is arranged at the feeding end, the feeding clamping mechanism comprises a feeding roller group composed of a pair of upper and lower rollers, there is a clamping gap between the upper and lower rollers, and the upper and lower rollers are installed in corresponding vertical grooves on both sides of the feeding end of the rolling support through bearings and bearing boxes, the upper or lower bearing box can be adjusted vertically.

3. The automotive leaf spring hot roll forming machine as set forth in claim 1, wherein Vertical strip-shaped holes are arranged on both sides of the guide port to adjust the height of the guide device. Vertical strip-shaped holes are arranged on both sides of the guide port to adjust the height of the guide device.

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