A precise rib pressing device for worm shafts

Abstract

A precise rib pressing device for a worm shaft disclosed by the present invention includes a rib pressing die and a clamping cylinder capable of fixing both ends of the worm shaft. A pressure maintaining mechanism for secondarily fixing the worm shaft is cooperatively provided on the clamping cylinder. The clamping cylinder has a plurality of clamping arms. The pressure maintaining mechanism includes a pressing component provided on each clamping arm and capable of pressing a portion of the worm shaft near the rib pressing point. When the worm shaft is restricted by all the pressing components, the worm shaft is in a state of being further fixed. In the present invention, the movable arm drives the pressing member to accurately move to a position close to the rib pressing point of the worm shaft, shortening the distance between the secondary clamping point and the rib pressing point, driving the pressing member to make the rubber layer thereon press against the surface of the worm shaft and gradually apply pressure, completing a stable secondary fixation, and effectively preventing the displacement or deformation of the worm shaft during the rib pressing process.

Description

Technical Field

[0001] The present invention relates to the technical field of worm shaft processing equipment, and specifically relates to a precise rib pressing equipment for worm shafts. Background Art

[0002] During the manufacturing process of worm shafts, the rib pressing process is an important link to improve their strength, wear resistance and transmission efficiency. During the rib pressing process, the worm shaft may be displaced due to large forces. Traditional positioning methods usually rely on manual adjustment or simple mechanical limiting, which are difficult to ensure the precise position of the worm shaft during the rib pressing process, and easily lead to poor consistency in rib pressing depth and shape.

[0003] In the prior art, for example, an automatic rib pressing tooling for shafts disclosed in a Chinese invention patent application (publication number CN105598293A) has a structure including: a processing platform; a lower die base provided on the processing platform and having a first installation groove on its upper surface; an upper die base capable of moving up and down above the lower die base, and a spring is provided between the upper die base and the lower die base to keep the upper die base always in an upward movement trend. A second installation groove is opened on the lower surface of the upper die base; a lower rib pressing die is provided in the first installation groove and has a first rib pressing groove; an upper rib pressing die is provided in the second installation groove and has a second rib pressing groove, and the second rib pressing groove corresponds to the first rib pressing groove up and down; a driving mechanism is provided above the upper die base and can drive the upper die base to move downward; an installation plate is further included, which is provided on the front side of the lower die base and has a first through hole for the shaft to be processed to pass through, and the first through hole corresponds to the first rib pressing groove; a fixture passes through the first through hole and is rotatably provided on the installation plate, and the fixture has a clamping hole penetrating from front to back; a gear is provided on the fixture and on the front side of the installation plate, and a second through hole for the fixture to pass through is opened in the middle of the gear; an installation seat is provided on the processing platform and on the front side of the installation plate, and has a chute arranged perpendicular to the axial direction of the second through hole; a rack is provided in the chute and meshes with the gear; a first cylinder, the power output end of the cylinder is connected to the rack and can drive the rack to move back and forth in the chute; and a clamping cylinder is provided on the rear side of the installation plate and can clamp or release the shaft to be processed in the fixture.

[0004] In the above-mentioned prior art, the shaft to be processed is clamped by a clamping cylinder. However, during the rib pressing process, the shaft to be processed will be subjected to a large force, and the clamping cylinder only provides a static clamping function without considering the stability under dynamic conditions. If the clamping part of the clamping cylinder is far from the rib pressing point (i.e., the clamped part of the worm shaft is far from the area to be pressure processed), the workpiece may bend or vibrate due to the force, affecting the processing accuracy. Therefore, there is currently a need for a rib pressing device that can adjust the clamping position of the clamping cylinder to make the clamping position as close as possible to the rib pressing point, so as to shorten the distance between the clamping part and the rib pressing point, thereby reducing the bending or vibration of the workpiece caused by the force. Summary of the Invention

[0005] In view of the problems existing in the prior art, a precise rib pressing device for a worm shaft is provided. In the present invention, the movable arm drives the pressing member to accurately move to a position close to the rib pressing point of the worm shaft, shortening the distance between the secondary clamping point and the rib pressing point, driving the pressing member to make the rubber layer thereon press against the surface of the worm shaft and gradually apply pressure, completing a stable secondary fixation, and effectively preventing the displacement or deformation of the worm shaft during the rib pressing process.

[0006] To solve the problems of the prior art, the present invention provides a precise rib pressing device for a worm shaft for processing the worm shaft, including a rib pressing die and a clamping cylinder capable of fixing both ends of the worm shaft. A pressure maintaining mechanism for secondary fixation of the worm shaft is arranged in cooperation with the clamping cylinder. The clamping cylinder has a plurality of clamping arms. The pressure maintaining mechanism includes a pressing component arranged on each clamping arm that can press on the part of the worm shaft close to the rib pressing point. When the worm shaft is restricted by all the pressing components, the worm shaft is in a state of being further fixed. Each clamping cylinder can move in the direction close to or away from the rib pressing die according to the length of the worm shaft.

[0007] Preferably, the pressing component includes a movable arm arranged on the clamping arm and a pressing member arranged thereon. The movable arm can move on the clamping arm in the direction of the rib pressing die to drive the pressing member close to the rib pressing point of the worm shaft, and the pressing member can rotate on the movable arm along its moving direction to press on the worm shaft.

[0008] Preferably, the pressing member is specifically a plate structure rotatably connected to one end of the movable arm close to the rib pressing die. The end of the pressing member extending inward has a rubber layer, and the end of the pressing member extending outward has a return spring connected to the movable arm. When the rubber layer is deformed due to pressing on the worm shaft, the return spring is in a compressed state.

[0009] Preferably, the pressing component further includes a pressing driver for driving the pressing member to rotate. When the pressing member is close to the rib pressing point of the worm shaft, the pressing driver is in a starting state.

[0010] Preferably, the pressing driver has a trigger portion disposed near the rib pressing point of the worm shaft and capable of cooperating with the pressing member to rotate it. When the pressing member contacts the trigger portion and continues to move, the pressing member is in an inward rotation state under the block of the trigger portion, so that the worm shaft is clamped between all rubber layers.

[0011] Preferably, the pressing driver has a pulling rope connected to the pressing member and capable of applying a pulling force to rotate it. When the pressing member moves to near the rib pressing point of the worm shaft, the pressing member is in an inward rotation state under the pulling force of the pulling rope, so that the worm shaft is clamped between all rubber layers.

[0012] Preferably, a tension spring is connected between each movable arm and the corresponding clamping arm, and a linear driver for driving all the movable arms to move synchronously is provided on each clamping cylinder. When all the pressing members synchronously move to near the rib pressing point of the worm shaft, each pressing member is in a pressing state, and at the same time the tension spring is in a stretched state.

[0013] Preferably, the linear driver has a push plate, and each movable arm is provided with a pressed portion for cooperating with the push plate to be pushed. A guide groove for each clamping arm to move in the clamping direction is formed on the push plate.

[0014] Preferably, a flexible layer capable of adapting to the surface of the worm shaft is provided on each surface of the clamping arm capable of contacting the worm shaft.

[0015] Preferably, a limiting portion capable of abutting against the end of the worm shaft is provided on each clamping cylinder. When the worm shaft is positioned between the two limiting portions, the worm shaft is in a laterally limited state to prevent the worm shaft from slipping between the clamping arms.

[0016] The beneficial effects of this application compared with the prior art are as follows:

[0017] 1. By initially fixing the two ends of the worm shaft with multiple clamping arms and adjusting the position according to the actual length of the worm shaft, the present invention ensures that the portion to be ribbed is accurately located in the ribbing die.

[0018] Subsequently, the movable arms on each clamping arm drive the pressing member to accurately move to a position near the rib pressing point, shortening the distance between the secondary clamping point and the rib pressing point. As the pressing member rotates, the rubber layer contacts the surface of the worm shaft and applies a uniform pressure. The rubber layer gradually deforms, applying a greater pressure to the worm shaft, realizing the secondary fixation of the worm shaft, and ensuring that it does not undergo any displacement or deformation during the entire ribbing process.

[0019] 2. By the cooperation of the push plate and the pressed portion to push all the movable arms, the present invention realizes the synchronous displacement of all the pressing members, ensuring that each pressing member can accurately reach a position near the rib pressing point of the worm shaft.

[0020] As the pressing member approaches the bead pressing point, the pressing driver is activated in cooperation with the pressing member, causing the rubber layer on the pressing member to closely adhere to the worm shaft and apply uniform pressure, ensuring multi-point collaborative fixation and preventing any displacement or deformation.

[0021] 3. Through the flexible layer on the clamping arm and the limiting portion on the clamping cylinder, the present invention achieves precise fixation and surface protection of the worm shaft, enabling the portion of the worm shaft to be bead pressed to be located in the bead pressing die.

[0022] When the clamping arm contacts the worm shaft, the flexible layer distributes pressure evenly, avoiding damage caused by excessive local stress, ensuring uniform distribution of the clamping force, improving stability and reducing the risk of deformation. This enables the worm shaft to be stable between the two limiting portions to prevent the worm shaft from slipping between the clamping arms. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic three-dimensional structure diagram of a precise bead pressing device for a worm shaft according to the present invention.

[0024] Figure 2 is a schematic diagram of the state of bead pressing and forming of the bead pressing die of a precise bead pressing device for a worm shaft according to the present invention.

[0025] Figure 3 is a partial schematic three-dimensional structure cross-sectional view of a precise bead pressing device for a worm shaft according to the present invention.

[0026] Figure 4 is a schematic three-dimensional structure diagram of the clamping cylinder and the pressure maintaining mechanism of a precise bead pressing device for a worm shaft according to the present invention.

[0027] Figure 5 is a partial schematic three-dimensional structure cross-sectional view of the clamping cylinder and the pressure maintaining mechanism of a precise bead pressing device for a worm shaft according to the present invention.

[0028] Figure 6 is a schematic three-dimensional state diagram of Embodiment 1 of the pressing driver of a precise bead pressing device for a worm shaft according to the present invention.

[0029] Figure 7 is a schematic plan view of Embodiment 1 of the pressing driver of a precise bead pressing device for a worm shaft according to the present invention.

[0030] Figure 8 is a schematic three-dimensional state diagram of Embodiment 2 of the pressing driver of a precise bead pressing device for a worm shaft according to the present invention.

[0031] Figure 9 is a schematic plan view of Embodiment 2 of the pressing driver of a precise bead pressing device for a worm shaft according to the present invention.

[0032] Figure 10 is a schematic three-dimensional structure diagram of the worm shaft according to the present invention.

[0033] The reference numerals in the figure are: 1, bead pressing die; 11, upper die; 12, lower die; 2, worm shaft; 21, rib; 3, clamping cylinder; 31, clamping arm; 311, slide rail; 312, flexible layer; 32, push plate; 33, limiting part; 4, pressure maintaining mechanism; 41, pressing component; 411, movable arm; 4111, tension spring; 4112, pressed part; 412, pressing piece; 4121, rubber layer; 4122, return spring; 42, pressing driver; 421, triggering part; 422, pull rope. Detailed implementation mode

[0034] In order to further understand the features, technical means and the specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0035] See Figures 1 - 5 and Figure 10 As shown, a precise bead pressing device for a worm shaft is used to process the worm shaft 2, including a bead pressing die 1 and a clamping cylinder 3 capable of fixing both ends of the worm shaft 2. A pressure maintaining mechanism 4 for secondarily fixing the worm shaft 2 is arranged on the clamping cylinder 3 in a matching manner. The clamping cylinder 3 has a plurality of clamping arms 31. The pressure maintaining mechanism 4 includes a pressing component 41 arranged on each clamping arm 31 and capable of pressing the part of the worm shaft 2 close to the bead pressing point. When the worm shaft 2 is restricted by all the pressing components 41, the worm shaft 2 is in a state of being further fixed. Each clamping cylinder 3 can move in a direction close to or away from the bead pressing die 1 according to the length of the worm shaft 2.

[0036] The bead pressing die 1 is composed of an upper die 11 and a lower die 12. In the combined state of the upper die 11 and the lower die 12, a die cavity for forming beads on the worm shaft 2 is formed between the upper die 11 and the lower die 12.

[0037] When the worm shaft 2 is fixed by two clamping cylinders 3 and secondarily fixed by the pressure maintaining mechanism 4, the upper die 11 and the lower die 12 are gradually combined, so that the bead pressing process of the rib 21 is carried out on the worm shaft 2 in a fixed state.

[0038] When the worm shaft 2 is processed by the precise bead pressing device, the two ends of the worm shaft 2 are first fixed by the clamping cylinder 3. Each clamping cylinder 3 is equipped with a plurality of clamping arms 31. The clamping cylinder 3 can adjust its position according to the actual length of the worm shaft 2 to ensure that the part of the worm shaft 2 to be bead pressed can be accurately positioned in the bead pressing die 1.

[0039] After the worm shaft 2 is fixed by two clamping cylinders 3, the pressing components 41 on each clamping arm 31 all move to the position of the worm shaft 2 near the rib pressing point. All the pressing components 41 simultaneously apply an additional pressure to the part of the worm shaft 2 near the rib pressing point, so as to achieve secondary fixation and ensure that the worm shaft 2 will not displace or deform during the rib pressing process.

[0040] Subsequently, after the worm shaft 2 is firmly fixed, the upper die 11 and the lower die 12 start to gradually merge. Through the merging of the upper die 11 and the lower die 12, a die cavity for forming ribs on the worm shaft 2 is formed. As the upper die 11 and the lower die 12 get closer and closer, the worm shaft 2 is compressed, and part of the material flows into the pre-designed die cavity shape under the action of external force to form the required rib 21 structure.

[0041] See Figures 3 - 9 As shown, the pressing component 41 includes a movable arm 411 arranged on the clamping arm 31 and a pressing piece 412 arranged thereon. The movable arm 411 can move on the clamping arm 31 towards the rib pressing die 1 to drive the pressing piece 412 close to the rib pressing point of the worm shaft 2, and the pressing piece 412 can rotate on the movable arm 411 along its moving direction to press the worm shaft 2.

[0042] A slide rail 311 for the sliding connection of the movable arm 411 is arranged on the clamping arm 31.

[0043] When starting the secondary fixation of the worm shaft 2, first, the clamping cylinders 3 initially fix both ends of the worm shaft 2 through their multiple clamping arms 31. Subsequently, the movable arms 411 arranged on each clamping arm 31 accurately adjust their positions according to the rib pressing position of the worm shaft 2 to adapt to worm shafts 2 of different lengths.

[0044] As the movable arm 411 moves, the pressing piece 412 thereon also gradually approaches the rib pressing point of the worm shaft 2. Since the pressing piece 412 can rotate on the movable arm 411 along its moving direction, it can apply a uniform pressure to the worm shaft 2. Since the pressing piece 412 can be accurately positioned near the rib pressing point and provide stable support and uniform pressure, it effectively prevents the worm shaft 2 from bending or vibrating during the rib pressing process due to long-distance clamping.

[0045] See Figures 3 - 9 As shown, the pressing piece 412 is specifically a plate structure rotatably connected to one end of the movable arm 411 close to the rib pressing die 1. The end of the pressing piece 412 extending inwards has a rubber layer 4121, and the end of the pressing piece 412 extending outwards has a return spring 4122 connected to the movable arm 411. When the rubber layer 4121 deforms due to pressing the worm shaft 2, the return spring 4122 is in a compressed state.

[0046] When the pressing member 412 contacts the worm shaft 2, the rubber layer 4121 at the inwardly extending end thereof contacts the surface of the worm shaft 2 and begins to apply pressure. Since the rubber layer 4121 has a certain elasticity, it can adapt to the surface profile of the worm shaft 2, ensuring a more uniform pressure distribution and reducing the risk of damage to the worm shaft 2 caused by local overloading. As the pressing member 412 continues to rotate inwardly, the rubber layer 4121 gradually deforms, applying a greater pressure to the worm shaft 2.

[0047] During this process, the return spring 4122 is compressed. By clamping the worm shaft 2 with multiple pressing members 412, secondary fixation of the worm shaft 2 is achieved, ensuring that the worm shaft 2 does not undergo any displacement or deformation throughout the bead-forming process.

[0048] In addition, the return spring 4122 allows the pressing member 412 to quickly return to its initial state after the pressure is released, preparing for the next operation.

[0049] See Figure 3 As shown, the pressing assembly 41 further includes a pressing driver 42 for driving the pressing member 412 to rotate. When the pressing member 412 approaches the bead-forming point of the worm shaft 2, the pressing driver 42 is in the starting state.

[0050] When the pressing member 412 approaches the bead-forming point of the worm shaft 2, the pressing driver 42 starts and drives the pressing member 412 to rotate precisely to ensure the best contact and pressure distribution.

[0051] Specifically, before the pressing member 412 presses on the worm shaft 2, first, the movable arm 411 advances smoothly along the slide rail 311 on the clamping arm 31 towards the bead-forming point until the pressing member 412 moves to a position close to the bead-forming point of the worm shaft 2. At this time, the pressing driver 42 starts to work, enabling the pressing member 412 to automatically adjust its angle according to the specific profile of the worm shaft 2.

[0052] With the start of the pressing driver 42, the pressing member 412 makes fine-tuning rotations around its rotational connection point with the movable arm 411, enabling the rubber layer 4121 to better conform to the shape changes of the surface of the worm shaft 2. This not only ensures a uniform pressure distribution but also avoids the risk of workpiece damage caused by local overloading. During the rotation process, the rubber layer 4121 gradually deforms, applying a gradually increasing pressure to the worm shaft 2.

[0053] With the synchronous operation of multiple pressing assemblies 41, the worm shaft 2 is comprehensively and stably fixed throughout the bead-forming process, preventing any possible displacement or deformation and maintaining the best processing state.

[0054] See Figures 3 - 7As shown, the pressing driver 42 has a trigger portion 421 disposed near the rib pressing point of the worm shaft 2 and capable of cooperating with the pressing member 412 to rotate it. When the pressing member 412 contacts the trigger portion 421 and continues to move, the pressing member 412 is in an inward rotation state under the block of the trigger portion 421, so that the worm shaft 2 is clamped between all the rubber layers 4121.

[0055] When the pressing member 412 approaches the rib pressing point of the worm shaft 2, as the pressing member 412 continues to move and contacts the trigger portion 421, the trigger portion 421 applies a blocking force to the pressing member 412. Since the pressing member 412 is rotatably connected to the movable arm 411, the formed blocking force causes the pressing member 412 to be forced to rotate around its rotation connection point with the movable arm 411.

[0056] As the pressing member 412 continues to travel, the pressing member 412 thus continuously rotates. The rotation action causes the rubber layer 4121 of the pressing member 412 to press against the surface of the worm shaft 2 and gradually deform, thereby applying a gradually increasing pressure to the worm shaft 2. The worm shaft 2 is thus stabilized between all the rubber layers 4121.

[0057] See Figures 3 - 5 、 Figure 8 and Figure 9 As shown, the pressing driver 42 has a pull rope 422 connected to the pressing member 412 and capable of applying a pulling force to rotate it. When the pressing member 412 moves to near the rib pressing point of the worm shaft 2, the pressing member 412 is in an inward rotation state under the pulling force of the pull rope 422, so that the worm shaft 2 is clamped between all the rubber layers 4121.

[0058] When the movable arm 411 steadily advances along the slide rail 311 on the clamping arm 31 until the pressing member 412 approaches the rib pressing point position of the worm shaft 2, the pull rope 422 connected to the pressing member 412 is activated and starts to apply a pulling force. The specific structure for driving the pull rope 422 is not shown in the figure.

[0059] Since the pressing member 412 is rotatably connected to the movable arm 411, the pulling force of the pull rope 422 causes the pressing member 412 to actively rotate around its rotation connection point with the movable arm 411. As the pressing member 412 continues to rotate under the continuous pulling force of the pull rope 422, the rubber layer 4121 gradually approaches and finally contacts the surface of the worm shaft 2. The rubber layer 4121 has a certain elasticity and can adapt to the specific contour of the worm shaft 2 and gradually deform during the contact process.

[0060] As the pressing member 412 continuously rotates, the pressure applied to the worm shaft 2 gradually increases, and the deformation degree of the rubber layer 4121 also gradually increases. The worm shaft 2 is thus stabilized between all the rubber layers 4121. [[ID=2S]]

[0061] SeeFigure 3 , Figure 4 and Figures 6 - 9 As shown in Figure 3 , Figure 4 and Figures 6 - 9 , a tension spring 4111 is connected between each movable arm 411 and the corresponding clamping arm 31. A linear actuator for driving all the movable arms 411 to move synchronously is provided on each clamping cylinder 3. When all the pressing members 412 move synchronously to approach the bead-forming point of the worm shaft 2, each pressing member 412 is in a pressing state, and at the same time the tension spring 4111 is in a stretched state.

[0062] When the linear actuator is started and drives all the movable arms 411 to synchronously advance towards the bead-forming point of the worm shaft 2, the movable arms 411 move smoothly along the slide rail 311 on the clamping arm 31. Since a tension spring 4111 is connected between each movable arm 411 and the corresponding clamping arm 31, the tension spring 4111 is gradually stretched during the movement of the movable arm 411, providing conditions for the reset of the movable arm 411.

[0063] As the movable arms 411 continue to advance, the pressing members 412 gradually approach the bead-forming point of the worm shaft 2 and finally contact the surface of the worm shaft 2 through the pressing actuator 42, so that the rubber layer 4121 applies pressure to the worm shaft 2.

[0064] As all the pressing members 412 move synchronously and contact the worm shaft 2, each pressing member 412 makes the rubber layer 4121 closely fit the surface of the worm shaft 2 and applies uniform pressure to the worm shaft 2. Through the multi-point cooperation method, the worm shaft 2 is comprehensively and stably fixed during the entire bead-forming process, effectively preventing any possible displacement or deformation, and maintaining the best processing state.

[0065] When the bead-forming process is completed, the linear actuator stops working, the reset spring 4122 relieves the pressure on the pressing member 412, quickly returns the pressing member 412 to the initial position, and the tension spring 4111 also returns to the original state, causing the pressing member 412 to reset and preparing for the next operation. It is beneficial to adjust the position of the pressing shaft according to the length of the worm shaft 2 to ensure that the position of the worm shaft 2 close to the bead-forming point can be accurately fixed.

[0066] See Figure 5 , Figure 6 and Figure 8 As shown in Figure 5 , Figure 6 and Figure 8 , the linear actuator has a push plate 32. A pressed part 4112 for being pushed in cooperation with the push plate 32 is provided on each movable arm 411. A guide groove for each clamping arm 31 to move in the clamping direction is formed on the push plate 32.

[0067] When the linear actuator starts to work, its push plate 32 advances forward. The push plate 32 contacts all the pressed parts 4112. As the push plate 32 advances, each movable arm 411 moves smoothly along the slide rail 311 on the clamping arm 31 towards the bead-forming point of the worm shaft 2.

[0068] Since each active arm 411 is in close fit with the push plate 32 through its pressed part 4112, all the pressing members 412 can move synchronously and apply pressure evenly. By means of multi-point cooperation, the worm shaft 2 is comprehensively and stably fixed during the entire rib pressing process.

[0069] When the clamping arm 31 on the clamping cylinder 3 adjusts the clamping position, the clamping arm 31 moves along the direction of the guide groove on the push plate 32, which neither hinders the movement of the push plate 32 nor the effective movement of the clamping arm 31.

[0070] See Figure 4 As shown, a flexible layer 312 capable of adapting to the surface of the worm shaft 2 is provided on each surface of the clamping arm 31 that can contact the worm shaft 2.

[0071] When the clamping arm 31 gradually approaches and finally contacts the worm shaft 2, the flexible layer 312 on the clamping arm 31 first contacts the surface of the worm shaft 2. Due to the existence of the flexible layer 312, the clamping arm 31 can evenly distribute the pressure during the contact process, avoiding the risk of damage to the worm shaft 2 caused by local excessive force.

[0072] As the clamping arm 31 continues to apply the clamping force, the flexible layer 312 further conforms to the surface of the worm shaft 2, filling any tiny unevenness, ensuring that the clamping force is evenly distributed over the entire contact surface of the worm shaft 2. The uniform pressure distribution not only improves the clamping stability but also reduces the possibility of deformation or damage to the worm shaft 2 caused by uneven clamping force.

[0073] In addition, the flexible layer 312 also provides an additional buffering effect, preventing the impact that may be brought by hard contact and protecting the surface quality of the worm shaft 2.

[0074] See 、 Figure 3 and Figure 4 Figures 6 - 9 As shown, a limiting part 33 capable of abutting against the end of the worm shaft 2 is provided on each clamping cylinder 3. When the worm shaft 2 is positioned between the two limiting parts 33, the worm shaft 2 is in a laterally limited state to prevent the worm shaft 2 from slipping between the clamping arms 31.

[0075] When the clamping cylinder 3 starts to work and gradually approaches the worm shaft 2, the limiting parts 33 provided on each clamping cylinder 3 first contact the two ends of the worm shaft 2. As the position of the clamping cylinder 3 is adjusted, the worm shaft 2 is firmly fixed between the two limiting parts 33. This effectively prevents any slipping of the worm shaft 2 between the clamping arms 31 and ensures the accuracy and reliability of the subsequent rib pressing process.

[0076] In the present invention, both ends of the worm shaft 2 are initially fixed by multiple clamping arms 31, and the position is adjusted according to the length of the worm shaft 2 to ensure that the part to be ribbed is accurately positioned in the ribbing die 1. Subsequently, the movable arm 411 on each clamping arm 31 drives the pressing member 412 to accurately move to a position close to the ribbing point, shortening the distance between the secondary clamping point and the ribbing point. The pressing member 412 is activated to contact the surface of the worm shaft 2 through the rubber layer 4121 and apply a uniform pressure.

[0077] As the pressing member 412 rotates, the rubber layer 4121 presses against the surface of the worm shaft 2 and gradually deforms, enhancing the pressure on the worm shaft 2 and achieving a stable secondary fixation. It effectively prevents the displacement or deformation of the worm shaft 2 during the ribbing process, significantly improving the processing accuracy and stability.

[0078] The above embodiments only represent one or several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A worm shaft precision embossing device for processing worm shafts, comprising a embossing die and a clamping cylinder capable of fixing both ends of the worm shaft; It is characterized by: The clamping cylinder is provided with a pressure-maintaining mechanism for secondary fixation of the worm shaft. The clamping cylinder has a plurality of clamping arms. The pressure-maintaining mechanism includes a pressing component provided on each clamping arm and capable of applying pressure to a portion of the worm shaft near the rib point. When the worm shaft is restrained by all the pressing components, the worm shaft is further fixed. Each of the clamping cylinders can move toward or away from the beading die according to the length of the worm shaft; The pressing assembly includes a movable arm provided on the clamping arm and a pressing piece provided thereon, wherein the movable arm can move on the clamping arm toward the embossing die to drive the pressing piece close to the embossing point of the worm shaft, and the pressing piece can rotate on the movable arm along its moving direction to apply pressure to the worm shaft; The pressing member is specifically a plate structure rotatably connected to one end of the movable arm near the rib pressing mold. The inwardly extending end of the pressing member has a rubber layer, and the outwardly extending end of the pressing member has a return spring connected to the movable arm. When the rubber layer applies pressure to the worm shaft and deforms, the return spring is in a compressed state. The pressing assembly further includes a pressing driver for driving the pressing member to rotate. When the pressing member approaches the rib point of the worm shaft, the pressing driver is in an activated state. The pressing driver has a trigger portion disposed near the rib point of the worm shaft and capable of cooperating with the pressing member to rotate the pressing member. When the pressing member contacts the trigger portion and continues to move, the pressing member rotates inwardly under the obstruction of the trigger portion, so that the worm shaft is clamped between all the rubber layers. The pressing drive has a pull rope connected to the pressing member that can apply tension to cause it to rotate. When the pressing member moves to a point close to the rib of the worm shaft, the pressing member rotates inward under the tension of the pull rope, causing the worm shaft to be clamped between all the rubber layers. A tension spring is connected between each movable arm and the corresponding clamping arm, and each clamping cylinder is equipped with a linear actuator for driving all movable arms to move synchronously. When all the pressing parts move synchronously to the rib point close to the worm shaft, each pressing part is in a compressive state, and the tension spring is in a tensile state at the same time; The linear drive has a push plate, and each movable arm is provided with a pressure portion that cooperates with the push plate to be pushed. The push plate is provided with a guide groove for each clamping arm to move in the clamping direction.

2. The worm shaft precision rib pressing device according to claim 1, characterized in that: The surface of each clamping arm that can contact the worm shaft is provided with a flexible layer that can adapt to the surface of the worm shaft.

3. The worm shaft precision rib pressing device according to claim 1, characterized in that: Each clamping cylinder is provided with a limiting portion capable of abutting against the end of the worm shaft. When the worm shaft is positioned between the two limiting portions, the worm shaft is in a laterally limited state to prevent the worm shaft from slipping between the clamping arms.

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