A bushing positioning lip stamping device

Abstract

The present application belongs to the technical field of bearing bush production and manufacturing, and particularly relates to a bearing bush positioning lip stamping device, which comprises a base and a positioning seat arranged on the base, wherein the positioning seat is provided with a positioning groove for accommodating a bearing bush; a concave die is arranged at one end of the positioning groove; a punch is arranged opposite to the cavity; a material pressing part is arranged to reciprocate along the first direction; a retaining mechanism is arranged between the material pressing part and the base, and the retaining mechanism is configured to keep the material pressing part and the base in a relatively fixed state when the first limiting surface abuts against the target area, and to release the material pressing part from the relatively fixed state. Through the synergistic effect of the material pressing part and the retaining mechanism, the protrusion deformation caused by material flow during the stamping process is effectively inhibited, the secondary machining link required by the traditional process is eliminated, and the production efficiency and product consistency are significantly improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bearing bush manufacturing, and particularly relates to a bearing bush positioning lip stamping device. BACKGROUND

[0002] The positioning lip of a bearing bush is used to realize the circumferential and axial positioning between the bearing bush and the bearing seat, and the positioning lip of a thin-walled bearing bush is generally made by stamping process. However, the existing stamping process lacks constraint on the peripheral area of the positioning lip, and the bearing bush material flows to the surrounding of the stamping area in the stamping process, thereby causing bulging near the positioning lip, for example, the bearing bush material accumulates along the inner arc surface of the bearing bush to the surrounding of the stamping area, thereby causing protrusions protruding from the inner arc surface of the bearing bush around the stamping area. The existing technology generally eliminates these protrusions by secondary machining, but the secondary machining not only increases the process complexity, but also leaves burrs on the surface of the bearing bush; in addition, the inner arc surface of some bearing bushes has an alloy layer, and the above-mentioned protrusions and secondary machining also cause damage to these alloy layers. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a positioning lip stamping device capable of improving the production efficiency and the forming quality of the inner arc surface of the bearing bush.

[0004] To achieve the above-mentioned purpose and other related purposes, the present application provides a bearing bush positioning lip stamping device, comprising a base, and a positioning seat, a punch, a concave die and a pressure material part provided on the base.

[0005] The positioning seat is provided with a positioning groove for accommodating a bearing bush, and the positioning groove is configured to enable at least the inner arc surface of the accommodated bearing bush to be exposed.

[0006] The concave die is provided at one end of the positioning groove, and the concave die is configured to be able to fit with the outer arc surface of the accommodated bearing bush, and the concave die is provided with a cavity.

[0007] The punch is provided opposite to the cavity, and the punch is provided to reciprocate along a first direction, so that the punch can approach or move away from the concave die; the first direction is perpendicular to the axial direction of the accommodated bearing bush.

[0008] The pressure material part has a first limiting surface matched with the inner arc surface of the accommodated bearing bush, and the pressure material part is provided to reciprocate along the first direction, so that the first limiting surface can abut against or separate from the target area of the inner arc surface of the bearing bush, and the target area is an area adjacent to the stamping area of the punch.

[0009] A holding mechanism is arranged between the pressing part and the base, and is configured to hold the pressing part and the base in a relatively fixed state when the first limiting surface abuts against the target region, and to release the pressing part from the relatively fixed state.

[0010] In an optional embodiment of the present application, the holding mechanism comprises a double-rod hydraulic cylinder and a stop valve. The double-rod hydraulic cylinder comprises a cylinder body, a piston, and two connecting rods. The piston is movably arranged in the cylinder body, and the inner cavity of the cylinder body is divided into a first chamber and a second chamber by the piston. The two connecting rods are respectively connected to the two ends of the piston, and extend from the two ends of the cylinder body to the outside of the cylinder body. The axis direction of the double-rod hydraulic cylinder is parallel to the first direction. One of the connecting rods and the cylinder body is fixedly connected to the pressing part, and the other one is fixedly connected to the base. The first chamber and the second chamber are respectively connected to the stop valve through pipelines. The stop valve is used to control the communication or disconnection of the first chamber and the second chamber.

[0011] In an optional embodiment of the present application, an upper die holder is further arranged. The upper die holder is movably connected to the base along the first direction. The punch is fixedly connected to the upper die holder. The pressing part is movably connected to the upper die holder along the first direction. A first limiting part is arranged between the pressing part and the upper die holder to limit the movement stroke of the pressing part relative to the upper die holder. A first elastic element is arranged between the pressing part and the upper die holder. The first elastic element is configured to drive the pressing part to move downward relative to the upper die holder by the elastic force.

[0012] In an optional embodiment of the present application, the upper die holder is configured to have a first stroke, a second stroke, and a third stroke along the first direction. When the upper die holder moves within the first stroke, the punch and the pressing part are in a separated state from the bearing. When the upper die holder moves within the second stroke, the pressing part abuts against the bearing, and the punch is in a separated state from the bearing. When the upper die holder moves within the third stroke, the pressing part abuts against the bearing, and the punch can extrude the bearing to form a positioning lip.

[0013] In an optional embodiment of the present application, a triggering device is further included, one of the triggering device and the shut-off valve is mounted on the pressure part, and the other is mounted on the upper die holder; the triggering device is configured to control the shut-off valve to be closed when the upper die holder moves towards the die cavity in the second stroke, and to be opened when the upper die holder moves away from the die cavity in the second stroke.

[0014] In an optional embodiment of the present application, the shut-off valve is a stroke switch shut-off valve, which includes a trigger rod configured to open the shut-off valve when the trigger rod is pressed and to close the shut-off valve when the trigger rod is released; the triggering device includes a wedge block matched with the trigger rod, the wedge block is configured to press the trigger rod when the upper die holder moves away from the die cavity relative to the pressure part, and to release the trigger rod when the upper die holder moves towards the die cavity relative to the pressure part.

[0015] In an optional embodiment of the present application, the valve housing of the shut-off valve is fixed relative to the pressure part, and the wedge block is fixed relative to the upper die holder.

[0016] In an optional embodiment of the present application, the die cavity further includes a second limiting surface matched with the end surface of the bushing, the end surface of the bushing refers to the joint surface when the bushing is jointed with another bushing in use; the corresponding region of the second limiting surface to the positioning lip is formed on a movable block, the movable block is movably arranged along a second direction, the second direction is parallel to the second limiting surface and perpendicular to the axis of the bushing; the movable block is arranged opposite to the punch, so that the punch can drive the movable block to move along the second direction when the punch moves in the third stroke.

[0017] In an optional embodiment of the present application, a second elastic element is arranged between the movable block and the positioning seat, the second elastic element is configured to have an elastic force to drive the movable block to move towards the axis of the bushing.

[0018] In an optional embodiment of the present application, a second limiting part for limiting the movement stroke of the movable block is arranged between the movable block and the positioning seat.

[0019] The technical effect of the present application is that through the cooperation of the pressing part and the retaining mechanism, the target area of the inner arc surface of the bearing bush is first pressed tightly and locked before the positioning lip is punched by the punch, effectively inhibiting the protrusion deformation caused by material flow during the punching process, thereby directly obtaining the forming quality of the flat inner arc surface, not only eliminating the secondary machining link required by the traditional process, but also significantly improving the production efficiency and product consistency, and realizing high-precision machining of one-time forming of the bearing bush positioning lip. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the bearing bush provided by the embodiment of the present application;

[0021] Figure 2 is a perspective view of the bearing bush positioning lip punching device provided by the embodiment of the present application;

[0022] Figure 3 is a sectional view of the bearing bush positioning lip punching device provided by the embodiment of the present application;

[0023] Figure 4 is an assembled state perspective view of the punch and the pressing part provided by the embodiment of the present application;

[0024] Figure 5 is an assembled state bottom view of the punch and the pressing part provided by the embodiment of the present application;

[0025] Figure 6 is an A-A sectional view of Figure 5 ;

[0026] Figure 7 is a B-B sectional view of Figure 5 ;

[0027] Figure 8 is an exploded view of the positioning seat and the concave die provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied by different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0029] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only show the components related to the present application in the drawings, not according to the number, shape and size of the components when actually implemented. The actual implementation of each component type, number and proportion can be a random change, and the component layout type can be more complex.

[0030] Figure 1 A bearing bush 10 suitable for the present application is shown. The existing process will form a protrusion around the stamping area (i.e. the target area 15 shown in the shadow part) when forming the positioning lip 14, which affects the forming quality of the inner arc surface of the bearing bush 10. In order to solve this technical problem, the present application presses this area tightly by the pressing part 50 before the stamping action, and locks the pressing part 50 by the retaining mechanism, so as to avoid the pressing part 50 from lifting under the stress of the bearing bush 10 during the stamping process. The pressing part 50 can prevent the bearing bush 10 from protruding during the stamping process, thereby improving the forming quality of the bearing bush 10, and at the same time, the secondary machining process is saved, and the production efficiency is improved.

[0031] Please refer to Figures 2-8 The technical solutions of the present application are described in detail below in combination with specific embodiments:

[0032] Please refer to Figures 2-8As shown, the embodiment of the application provides a bushing 10 positioning lip 14 stamping device, which comprises a base 100, a positioning seat 20, a die 30, a punch 40, a pressing part 50 and a retaining mechanism arranged on the base 100. The positioning seat 20 is provided with a positioning groove 201 for accommodating the bushing 10, and the positioning groove 201 is configured to expose at least the inner arc surface 11 of the accommodated bushing 10; the die 30 is arranged at one end of the positioning groove 201, and the die 30 is configured to be in contact with the outer arc surface 12 of the accommodated bushing 10, and the die 30 is provided with a cavity 301; the punch 40 is arranged opposite to the cavity 301, and the punch 40 is arranged to reciprocate along a first direction so as to approach or move away from the die 30; the first direction is perpendicular to the axial direction of the accommodated bushing 10; the pressing part 50 has a first limiting surface 501 matched with the inner arc surface 11 of the accommodated bushing 10, and the pressing part 50 is arranged to reciprocate along the first direction so as to abut against or separate from the target area 15 of the inner arc surface 11 of the bushing 10, and the target area 15 is an area adjacent to the stamping area of the punch 40; the retaining mechanism is arranged between the pressing part 50 and the base 100, and the retaining mechanism is configured to keep the pressing part 50 and the base 100 in a relatively fixed state when the first limiting surface 501 abuts against the target area 15, and the retaining mechanism is capable of releasing the pressing part 50 from the relatively fixed state. Through the cooperation of the pressing part 50 and the retaining mechanism, the target area 15 of the inner arc surface 11 of the bushing 10 is pressed and locked before the punch 40 performs the positioning lip 14 stamping, which effectively suppresses the protrusion deformation caused by material flow during stamping, thereby directly obtaining the forming quality of the flat inner arc surface 11, which not only eliminates the secondary machining link required by the traditional process (avoiding burr and alloy layer damage), but also significantly improves the production efficiency and product consistency, and realizes the high-precision machining of the one-time forming of the positioning lip 14 of the bushing 10.

[0033] Please refer to Figures 4-7As shown, in an optional embodiment of the present application, the holding mechanism comprises a double-rod hydraulic cylinder 70 and a stop valve 80, the double-rod hydraulic cylinder 70 comprises a cylinder body 71, a piston 72 and two connecting rods 73, the piston 72 is movably arranged in the cylinder body 71, the inner cavity of the cylinder body 71 is divided into a first chamber and a second chamber by the piston 72, the two connecting rods 73 are respectively connected to the two ends of the piston 72, and the two connecting rods 73 respectively penetrate from the two ends of the cylinder body 71 to the outside of the cylinder body 71, the axis direction of the double-rod hydraulic cylinder 70 is arranged in parallel with the first direction, one of the connecting rod 73 and the cylinder body 71 is fixedly connected with the pressure part 50, and the other of the connecting rod 73 and the cylinder body 71 is fixedly connected with the base 100, the first chamber and the second chamber are respectively communicated with the stop valve 80 through pipelines, and the stop valve 80 is used for controlling the communication or disconnection of the first chamber and the second chamber. This further embodiment adopts the double-rod hydraulic cylinder 70 and the stop valve 80 to constitute the holding mechanism, and realizes the rigid locking of the pressure part 50 through the hydraulic locking principle: when the stop valve 80 is closed, the oil way of the two chambers of the hydraulic cylinder is cut off, the relative position of the piston 72 and the cylinder body 71 is fixed, the pressure part 50 can keep stable pressing force during the stamping process, and the pressure part 50 is prevented from retreating due to material stress; meanwhile, the symmetrical structure of the double rods balances the internal stress of the hydraulic cylinder, ensures that the volume of the first chamber and the second chamber increases or decreases synchronously, improves the locking reliability, ensures that the target area 15 is subjected to uniform pressure in the whole stamping process, and further guarantees the forming precision and consistency of the inner arc surface 11 of the bearing bush 10.

[0034] Please refer to Figures 2-7As shown, in an optional embodiment of the present application, an upper die holder 60 is further included, which is movably connected with the base 100 along the first direction, the punch 40 is fixedly connected with the upper die holder 60, the material pressing part 50 is movably connected with the upper die holder 60 along the first direction, and a first limiting part 52 for limiting the movement stroke of the material pressing part 50 relative to the upper die holder 60 is arranged between the material pressing part 50 and the upper die holder 60, and a first elastic element 51 is arranged between the material pressing part 50 and the upper die holder 60, which is configured to have an elastic force capable of driving the material pressing part 50 to move downward relative to the upper die holder 60. This further embodiment integrates the punch 40 and the material pressing part 50 by the upper die holder 60, and sets the first limiting part 52 and the first elastic element 51, thereby realizing the pre-pressing function of the material pressing part 50: before the punch 40 contacts the bearing bush 10, the elastic element drives the material pressing part 50 to first press the target region 15, thereby forming an initial constraint; when the upper die holder 60 continues to move downward during the stamping process, the limiting part ensures that the material pressing part 50 maintains a certain pressure, thereby forming a dynamic constraint on the stamping region, which not only optimizes the material flow control effect, but also simplifies the device structure, so that the stamping and pressing actions are coordinated and synchronized, thereby further improving the forming precision of the positioning lip 14 and the process stability.

[0035] In specific embodiments, a driving column 62 can be connected to the upper die holder 60, which can form a guide cooperation with a cross beam arranged on the base 100, and a driving element such as a hydraulic cylinder can be arranged on the cross beam to drive the driving column 62 to move up and down. In order to further improve the stability of the operation of the upper die holder 60, a guide sleeve 61 can be further arranged on the upper die holder 60, and a guide column 110 cooperating with the guide sleeve 61 can be arranged on the base 100.

[0036] The upper die holder 60 is configured to have a first stroke, a second stroke and a third stroke in the first direction, when the upper die holder 60 moves in the first stroke, the punch 40 and the pressure piece 50 are simultaneously in a separated state with the bearing bush 10; when the upper die holder 60 moves in the second stroke, the pressure piece 50 keeps in a tightly pressed state with the bearing bush 10, and the punch 40 is in a separated state with the bearing bush 10; when the upper die holder 60 moves in the third stroke, the pressure piece 50 keeps in a tightly pressed state with the bearing bush 10, and the punch 40 can extrude the bearing bush 10 to form the positioning lip 14. This further embodiment realizes the timing optimization of the pressure and punching actions by dividing the movement of the upper die holder 60 into three precisely controlled stroke stages: the first stroke realizes fast approach to the workpiece, the second stroke ensures that the pressure piece 50 fully presses the target area 15 to form a stable constraint, and the third stroke performs the punching forming of the positioning lip 14. This staged sequential control effectively avoids the material flow problems caused by insufficient pressure in the traditional process, and at the same time ensures the accuracy of the process timing through mechanical linkage, which improves the forming quality stability and enhances the equipment operation efficiency.

[0037] Please refer to Figure 4 、 5 , 7, in an optional embodiment of the present application, further comprising a trigger device, one of the trigger device and the shut-off valve 80 is installed on the pressure piece 50, and the other is installed on the upper die holder 60; the trigger device is equipped to control the shut-off valve 80 to be closed when the upper die holder 60 moves in the second stroke towards the direction of approaching the concave die 30, and to be turned on when the upper die holder 60 moves in the second stroke away from the concave die 30. This further embodiment realizes the automatic and accurate triggering of hydraulic locking through the linkage control of the trigger device and the shut-off valve 80: the shut-off valve 80 is automatically closed to lock the pressure piece 50 when the upper die holder 60 enters the second stroke (pressure stage), ensuring that the pressing force remains constant during the punching stage; the oil circuit is automatically turned on to release the pressure piece 50 during the return stroke, forming a seamless connection between the pressure and punching processes. This integrated design eliminates manual intervention errors and ensures process reliability through mechanical timing control, so that the entire device runs efficiently while maintaining stable forming quality.

[0038] It should be understood that in some alternative embodiments, the basic function of the retaining mechanism can also be achieved by manually triggering the shut-off valve 80.

[0039] Please refer to Figure 4 、 5In an alternative embodiment of the present application, the stop valve 80 is a travel switch stop valve, which includes a trigger lever 81 configured to turn on the stop valve 80 when the trigger lever 81 is pressed and turn off the stop valve 80 when the trigger lever 81 is released. The trigger device includes a wedge block 63 cooperating with the trigger lever 81, which is assembled to press the trigger lever 81 when the upper die holder 60 moves away from the concave die 30 relative to the pressure section 50, and release the trigger lever 81 when the upper die holder 60 moves toward the concave die 30 relative to the pressure section 50. This further embodiment realizes automatic switching of the hydraulic locking state through the mechanical linkage design of the wedge block 63 and the travel switch stop valve: when the upper die holder 60 descends, the wedge block 63 disengages the trigger lever 81, the stop valve 80 is closed to keep the pressure section 50 locked; when the upper die holder 60 returns, the wedge block 63 pushes the trigger lever 81 to turn on the oil path, and automatically releases the locking. This purely mechanical trigger mechanism not only responds quickly and has high reliability, but also does not require an additional power source, simplifying the control system, and at the same time ensures accurate synchronization of each action through rigid contact, further improving the stability of the equipment operation and the process repeatability.

[0040] In some embodiments, the valve housing of the stop valve 80 can be fixed relative to the pressure section 50, and the wedge block 63 is fixed relative to the upper die holder 60. However, it should be noted that the installation positions of the stop valve 80 and the wedge block 63 are not unique, for example, in some other embodiments, the stop valve 80 can be arranged on the upper die holder 60, and the wedge block 63 can be arranged on the pressure section 50.

[0041] It should be understood that the triggering mode of the stop valve 80 is not unique, for example, in some alternative embodiments, the stop valve 80 can be arranged as an electromagnetic stop valve, and a travel detection device (such as an optical sensor or a travel switch) is arranged to detect the relative position of the pressure section 50 and the punch 40. The detection device sends a detection signal to the controller, and the controller controls the opening and closing of the stop valve 80 according to the detection signal.

[0042] Please refer to Figure 2 、 3,8, in an optional embodiment of the present application, the concave die 30 further comprises a second limiting surface 302 matched with the end surface of the bearing bush 10, wherein the end surface of the bearing bush 10 refers to the splicing surface when the bearing bush 10 is spliced with another bearing bush 10 in use; the corresponding area of the second limiting surface 302 to the positioning lip 14 is formed on a movable insert block 31, the movable insert block 31 is movably arranged along a second direction, and the second direction is parallel to the second limiting surface 302 and perpendicular to the axis of the bearing bush 10; the movable insert block 31 is arranged opposite to the punch 40, so that the punch 40 can push the movable insert block 31 to move along the second direction when the punch 40 moves in the third stroke. It should be noted that in the traditional stamping process, the material of the bearing bush 10 will not only bulge to the inner arc surface 11, but also bulge to the end surface of the bearing bush 10. Therefore, the present application further provides the second limiting surface 302 to constrain the end surface of the bearing bush 10. The further embodiment realizes the constraint of the material of the end surface of the bearing bush 10 through the design of the movable insert block 31 type second limiting surface 302: in the stamping process, the punch 40 pushes the movable insert block 31 to move synchronously, so that the second limiting surface 302 always adheres to the end surface of the bearing bush 10, effectively inhibiting the flow deformation of the material to the end surface; this dynamic following constraint mode solves the problem of end surface bulging caused by the traditional process, ensures the forming precision of the positioning lip 14, and maintains the geometric integrity of the splicing surface of the bearing bush 10, thereby providing a guarantee for the subsequent assembly quality.

[0043] Please refer to Figure 3 、 8 , in an optional embodiment of the present application, a second elastic element 32 is arranged between the movable insert block 31 and the positioning seat 20, and the second elastic element 32 is configured to have a elastic force capable of driving the movable insert block 31 to move towards the direction close to the axis of the bearing bush 10. The further embodiment enables the movable insert block 31 to automatically reset to the initial position after stamping through the arrangement of the second elastic element 32, which not only simplifies the mechanical control structure of the insert block return stroke, but also ensures that the insert block can be accurately positioned before each stamping, thereby providing a stable and reliable dynamic constraint condition for continuous stamping operation, and effectively improving the working efficiency and process stability of the equipment.

[0044] Please refer to Figure 3 、 8 , in an optional embodiment of the present application, a second limiting part 33 for limiting the movement stroke of the movable insert block 31 is arranged between the movable insert block 31 and the positioning seat 20. The further embodiment accurately controls the movement range of the movable insert block 31 through the arrangement of the second limiting part 33, which not only ensures that the insert block can tightly abut against the end surface of the bearing bush 10 to inhibit the flow of the material during the stamping process, but also prevents the mechanism interference or wear caused by overstroke, thereby improving the forming precision and enhancing the reliability and service life of the equipment operation.

[0045] In summary, the present application cooperates with the holding mechanism through the pressure material part 50, and before the punch 40 punches the positioning lip 14, the target area 15 of the inner arc surface 11 of the bearing bush 10 is first pressed and locked, effectively inhibiting the bulging deformation caused by material flow during the stamping process, thereby directly obtaining the forming quality of the flat inner arc surface 11, not only eliminating the secondary machining link required by the traditional process (avoiding burr and alloy layer damage), but also significantly improving the production efficiency and product consistency, realizing the one-time forming of the positioning lip 14 of the bearing bush 10; the present application adopts a double-rod hydraulic cylinder 70 and a stop valve 80 to form a holding mechanism, and realizes the rigid locking of the pressure material part 50 through the hydraulic locking principle: when the stop valve 80 is closed, the oil way of the two chambers of the hydraulic cylinder is cut off, the relative position of the piston 72 and the cylinder body 71 is fixed, so that the pressure material part 50 maintains stable pressing force during the stamping process, avoiding the retraction of the pressure material part 50 due to material stress; at the same time, the symmetrical structure of the double-rod balances the internal stress of the hydraulic cylinder, ensures the synchronous increase and decrease of the volume of the first chamber and the second chamber, improves the locking reliability, ensures that the target area 15 is subjected to uniform pressure throughout the stamping process, and further guarantees the forming precision and consistency of the inner arc surface 11 of the bearing bush 10; the present application realizes the automatic and accurate triggering of hydraulic locking through the linkage control of the trigger device and the stop valve 80: when the upper die holder 60 enters the second stroke (pressure material stage), the stop valve 80 is automatically closed to lock the pressure material part 50, ensuring that the pressing force remains constant during the stamping stage; when returning, the oil way is automatically turned on to release the pressure material part 50, forming seamless connection between the pressure material and the stamping process, which not only eliminates the manual intervention error, but also guarantees the process reliability through mechanical timing control, so that the whole device maintains stable forming quality while running efficiently; the present application realizes the constraint of the material on the end face of the bearing bush 10 through the design of the movable insert 31 type second limiting surface 302: during the stamping process, the movable insert 31 is pushed by the punch 40 to move synchronously, so that the second limiting surface 302 always adheres to the end face of the bearing bush 10, effectively inhibiting the flow deformation of the material to the end face; this dynamic following constraint method solves the problem of end face bulging caused by the traditional process, ensures the forming precision of the positioning lip 14, and maintains the geometric integrity of the splicing surface of the bearing bush 10, providing guarantee for the subsequent assembly quality.

[0046] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

[0047] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a thorough understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that an embodiment of the application can be practiced without one or more of the specific details, or with other devices, systems, assemblies, methods, components, materials, parts, and / or the like. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail in order to avoid obscuring aspects of embodiments of the present application.

Claims

1. A bushing locating lip stamping device characterized by, The base and the positioning groove for accommodating the bearing bushing are provided on the base. The positioning groove is configured to expose at least the inner arc surface of the bearing bushing. The concave die is configured to fit the outer arc surface of the bearing bushing. The punch is arranged opposite to the cavity and reciprocates along the first direction to approach or move away from the concave die. The first direction is perpendicular to the axial direction of the bearing bushing. The pressure material part has a first limiting surface matched with the inner arc surface of the bearing bushing. The pressure material part reciprocates along the first direction to make the first limiting surface abut against or separate from the target area of the inner arc surface of the bearing bushing. The target area is adjacent to the stamping area of the punch.

2. The bushing locating lip stamping device of claim 1, wherein, The retaining mechanism is arranged between the pressure material part and the base.

3. The bushing locating lip stamping device of claim 2, wherein, The retaining mechanism is configured to keep the pressure material part and the base in a relatively fixed state when the first limiting surface abuts against the target area and release the pressure material part from the relatively fixed state. The retaining mechanism includes a double-rod hydraulic cylinder and a stop valve. The double-rod hydraulic cylinder includes a cylinder body, a piston, and connecting rods. The piston is movably arranged in the cylinder body. The inner cavity of the cylinder body is divided into a first chamber and a second chamber by the piston. The two connecting rods are respectively connected to the two ends of the piston. The two connecting rods respectively penetrate the cylinder body from the two ends of the cylinder body to the outside of the cylinder body. The axis direction of the double-rod hydraulic cylinder is parallel to the first direction. One of the connecting rods and the cylinder body is fixedly connected to the pressure material part. The other of the connecting rods and the cylinder body is fixedly connected to the base. The first chamber and the second chamber are respectively communicated with the stop valve through pipelines. The upper die holder is movably connected to the base along the first direction. The punch is fixedly connected to the upper die holder. The pressure material part is movably connected to the upper die holder along the first direction. A first limiting part is arranged between the upper die holder and the pressure material part to limit the movement stroke of the pressure material part relative to the upper die holder. A first elastic element is arranged between the pressure material part and the upper die holder. The first elastic element is configured to drive the pressure material part to move downward relative to the upper die holder. The upper die holder is configured to have a first stroke, a second stroke, and a third stroke along the first direction. When the upper die holder moves within the first stroke, the punch and the pressure material part are simultaneously separated from the bearing bushing. When the upper die holder moves within the second stroke, the pressure material part abuts against the bearing bushing, and the punch is separated from the bearing bushing. When the upper die holder moves within the third stroke, the pressure material part abuts against the bearing bushing, and the punch can extrude the bearing bushing to form a positioning lip.

4. The bushing locating lip stamping device of claim 3, wherein, The trigger device and one of the shut-off valves are mounted on the pressure part, and the other is mounted on the upper die holder; the trigger device is configured to control the shut-off valve to close when the upper die holder moves towards the concave die in the second stroke, and to control the shut-off valve to open when the upper die holder moves away from the concave die in the second stroke.

5. The bushing locating lip stamping device of claim 4, wherein, The shut-off valve is a stroke switch shut-off valve, which includes a trigger rod configured to open the shut-off valve when the trigger rod is pressed, and to close the shut-off valve when the trigger rod is released; the trigger device includes a wedge block matched with the trigger rod, which is configured to press the trigger rod when the upper die holder moves away from the concave die relative to the pressure part, and to release the trigger rod when the upper die holder moves towards the concave die relative to the pressure part.

6. The bushing locating lip stamping device of claim 5, wherein, The valve shell of the shut-off valve is fixed relative to the pressure part, and the wedge block is fixed relative to the upper die holder.

7. The bushing locating lip stamping device of claim 3, wherein, The concave die further includes a second limiting surface matched with the end surface of the bushing, the end surface of the bushing being the joint surface when the bushing is jointed with another bushing in use; the corresponding area of the second limiting surface to the positioning lip is formed on a movable block, the movable block is movably arranged along a second direction, the second direction being parallel to the second limiting surface and perpendicular to the axis of the bushing; the movable block is arranged opposite to the punch, so that the punch can drive the movable block to move along the second direction when the punch moves in the third stroke.

8. The bushing locating lip stamping device of claim 7, wherein, A second elastic element is arranged between the movable block and the positioning seat, and the elastic force of the second elastic element is configured to drive the movable block to move towards the axis of the bushing.

9. The bushing locating lip stamping device of claim 8, wherein, A second limiting part for limiting the movement stroke of the movable block is arranged between the movable block and the positioning seat.

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