Punching equipment for inner side of small-diameter shaft sleeve of steering wheel

Abstract

The utility model discloses punching equipment for the inner side of a small-diameter shaft sleeve of a steering wheel. The punching equipment comprises an upper punching die and a lower punching die. The punching lower die is provided with a positioning sleeve, a punch, a stress body and a protection block; the positioning sleeve is provided with a punching hole, the workpiece is arranged outside the positioning sleeve in a sleeving mode, the punch and the stress body are arranged in the positioning sleeve, and in the process that the upper stamping die moves towards the lower stamping die, the protection block pressing rod can abut against the protection block, so that the protection block can abut against the workpiece, the acting force from outside to inside is applied to the workpiece, and punching from inside to outside can be achieved. Complicated procedures that punching burrs are located in a shaft sleeve workpiece and follow-up machining is needed due to the fact that a punch is located outside are reduced, before punching, the protection block pressing rod can abut against and make contact with the protection block firstly, so that the protection block pressing rod abuts against the workpiece and applies acting force from outside to inside to the workpiece, deformation of the workpiece in the punching process can be effectively restrained, and the punching quality of the shaft sleeve workpiece is improved. The shape and quality of the workpiece are protected.

Description

Technical Field

[0001] This application belongs to the field of steering wheel bushing processing, and particularly relates to a punching device for the inner side of a small-diameter steering wheel bushing. Background Technology

[0002] The sleeve used at the steering wheel position, which is long and thin at one end and thicker at the other, is usually called the steering wheel shaft sleeve or steering wheel knuckle sleeve. It is a tubular part used to protect the steering wheel shaft and provide a rotating connection. The long and thin end is usually connected to the steering wheel, and the thick end is connected to the steering mechanism (such as gears, racks, etc.). The square hole punched at the thick end of the steering wheel shaft sleeve is used to fix or connect other components, such as steering sensors or other accessories, to achieve accurate steering function.

[0003] Steering wheel sleeves are typically manufactured with square holes using a stamping process. Stamping allows for high-speed, continuous hole punching, significantly improving production efficiency and reducing manufacturing costs. Multiple holes can be punched at once, saving labor and time. Common punching fixtures, driven by a power mechanism, use a punch to punch holes in the tube wall from the outside in. However, when used as a steering wheel bushing, the inner wall of the sleeve has high requirements. Drilling from the outside in will cause punching burrs on the inner wall, affecting the punching accuracy. Subsequent deburring and shaping processes are required, which wastes manpower and affects production efficiency. The process of punching from the inside out can form punching burrs on the outer wall, reducing subsequent processing steps. However, punching from the inside out for small-diameter bushings faces some problems. First, due to the small inner diameter of the bushing, the traditional method of placing the power module and punch from the inside cannot be implemented. Due to the small diameter of the bushing, its structural stability is poor. Second, during the punching process, the bushing will be deformed by the punching pressure, and the processing accuracy and quality cannot be guaranteed. The problems faced by punching from the inside out for small-diameter bushings urgently need to be solved. Utility Model Content

[0004] This utility model provides a punching device for the inner side of a small-diameter steering wheel bushing, which at least solves or alleviates one or more technical problems in the prior art, or at least provides a beneficial alternative.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A punching device for the inner side of a small-diameter steering wheel bushing includes an upper punching die and a lower punching die;

[0007] The upper stamping die is equipped with a punch pressure rod and a protective block pressure rod;

[0008] The lower stamping die is provided with a positioning sleeve, a punch, a force-bearing body, and a protective block. The positioning sleeve has a punch hole, and the workpiece is sleeved outside the positioning sleeve. The punch and the force-bearing body are located inside the positioning sleeve. During the movement of the upper stamping die toward the lower stamping die, the pressure rod of the protective block can abut against the protective block, causing it to abut against the workpiece and apply an inward force to the workpiece. The pressure rod of the punch enters the interior of the positioning sleeve and abuts against the force-bearing body, causing it to drive the punch to move toward the punching direction to apply an inward force to the workpiece to achieve punching.

[0009] This utility model relates to a punching device for the inner side of a small-diameter steering wheel bushing. The punch and force-bearing body are positioned within a positioning sleeve, enabling the punching of small-diameter bushing workpieces from the inside out. The lower die presses down, causing the punch pressure rod to abut against the force-bearing body, allowing the punch to move from the inside out towards the punching hole. This achieves punching from the inside out, reducing the complexity of subsequent processing steps required for punching burrs located inside the bushing workpiece due to the punch being located on the outside. Before punching, the protective block pressure rod abuts against the protective block, applying an inward force to the workpiece. This effectively suppresses deformation of the workpiece during punching, protecting its shape and quality. The placement of the punch and force-bearing body inside the small-diameter bushing expands the applicable range of punching, enabling the punching of small-diameter bushing workpieces from the inside out, thus improving the flexibility and applicability of the equipment.

[0010] In a preferred embodiment, the force-bearing body is provided with an inclined force-bearing surface, the force-bearing body and the punch are disposed on the slider, the slider is disposed on the slide groove, and the end of the punch rod is provided with an inclined force-applying surface. The inclined force-applying surface vertically contacts the inclined force-bearing surface, which enables the force-bearing body to move within the slide groove.

[0011] By setting a punch with an inclined force-bearing surface and a punch pressure rod with an inclined force-applying surface, complex mechanical devices are not required. The vertical descent of the punch pressure rod can cause the slider to move laterally, which makes the system more reliable and stable. By reasonably designing the inclination angle of the inclined surface and parameters such as the mass and friction of the slider, precise control of the lateral movement of the slider can be achieved, which can meet the needs of different work tasks and improve work efficiency and accuracy.

[0012] In a preferred embodiment, the slider is provided with a discharge chute located on one side of the punch to receive the punch material, which can slide down along the discharge chute to the discharge port of the lower stamping die.

[0013] In a preferred embodiment, a reset block is provided on one side of the slider, and a reset block pressure rod is provided on the upper stamping die. The reset block pressure rod abuts against the reset block, causing it to push the slider to move toward the punching direction so as to reset the punch and the force-bearing body into the positioning sleeve.

[0014] In a preferred embodiment, the reset block includes an insertion hole with a vertical trapezoidal protrusion on the inner wall of the insertion hole. The end of the reset block pressure rod has a first inclined surface, and the middle has a groove with a second inclined surface. Before punching begins, during the descent of the reset block pressure rod, the first inclined surface contacts the upper inclined surface of the trapezoidal protrusion, enabling the reset block to abut against and push the slider to move the punch and the force-bearing body into the positioning sleeve. During punching, the slider pushes the reset block to move, causing the trapezoidal protrusion to enter the groove. After punching is completed, the reset block pressure rod moves upward, and the second inclined surface contacts the lower inclined surface of the trapezoidal protrusion, enabling the reset block to abut against and push the slider to move the punch and the force-bearing body into the positioning sleeve to achieve reset.

[0015] The reset block and reset block pressure rod are designed for resetting instead of using a conventional reset spring. The reasons are twofold: firstly, reset springs lose elasticity over time, affecting reset accuracy and distance, leading to changes in the punch's impact force and stroke, and compromising punching quality. Therefore, using a reset spring requires regular inspection and replacement. Secondly, the elastic deformation of a reset spring does not disappear instantly; the reset block needs time to settle before the next bushing workpiece can be processed. The reset block and reset block pressure rod in this application, however, ensure that the punch always resets to the optimal design position during continuous stamping operations, thus reducing costs and increasing efficiency.

[0016] In a preferred embodiment, the protective block has an arc-shaped surface to fit the outer side of the workpiece, so as to apply a more uniform force to suppress deformation on the workpiece.

[0017] In a preferred embodiment, the protective block is located on the upper side of the slider, and the protective block is provided with a clearance groove, allowing the punch and the force-bearing body to move into the clearance groove.

[0018] In a preferred embodiment, the protective block has a third inclined surface, and the protective block pressure rod has a fourth inclined surface. When the protective block pressure rod descends and the fourth inclined surface contacts the third inclined surface, the protective block can move toward the positioning sleeve.

[0019] In a preferred implementation, the protection block is reset by a reset spring.

[0020] In a preferred embodiment, the lower stamping die is provided with multiple spring positioning rods, which are arranged around the positioning sleeve. Each spring positioning rod has a receiving part, and the workpiece is placed on the receiving part. The upper stamping die presses down on the spring positioning rods to make the workpiece fit outside the positioning sleeve. The upper stamping die raises the spring positioning rods to lift the workpiece for collection.

[0021] By designing a spring positioning rod, the punch is prevented from moving towards the positioning sleeve to reset to the first position when the pressing unit rises. This prevents the punch from exerting force on the bushing workpiece, which has lost the protective block's abutment function, causing deformation or scratches on the already machined workpiece sleeve. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain this application and do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic diagram illustrating one embodiment of the punching device for the inner side of the small diameter bushing of the steering wheel according to this application is shown.

[0024] Figure 2 A schematic diagram illustrating one embodiment of the stamping upper die of this application is shown;

[0025] Figure 3 A schematic diagram illustrating one embodiment of the stamping die of this application is shown.

[0026] Figure 4 A schematic diagram illustrating one embodiment of the positioning sleeve of this application is shown;

[0027] Figure 5 A schematic diagram illustrating one embodiment of the present application with the punch in the first position is shown.

[0028] Figure 6 A schematic diagram illustrating one embodiment of the reset block of this application is shown;

[0029] Figure 7 A schematic diagram illustrating one embodiment of the punch unit of this application is shown.

[0030] Figure 8 A schematic diagram illustrating one embodiment of the protected block of this application is shown;

[0031] Label Explanation:

[0032] 1-Positioning sleeve; 10-Punch; 20-Punch pressure rod; 200-Inclined force application surface; 21-Reset block pressure rod; 211-First inclined surface; 212-Second inclined surface; 213-Groove; 22-Protective block pressure rod; 220-Third inclined surface; 30-Punch; 31-Slider; 310-Unloading chute; 32-Force-bearing body; 320-Inclined force-bearing surface; 33-Reset block; 330-Insertion hole; 331-Trapezoidal protrusion; 40-Protective block; 400-Fourth inclined surface; 401-Arc surface; 402-Allowing groove; 41-Fixing block; 42-Reset spring; 50-Spring positioning rod; 500-Receiving part; 6-Shaft sleeve workpiece; 7-Punching upper die; 8-Punching lower die; 80-Unloading port; 81-Slide groove. Detailed Implementation

[0033] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0034] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0036] In this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0037] The present invention will now be described with reference to the accompanying drawings.

[0038] The specific solution adopted is as follows:

[0039] like Figure 1-8 As shown, this utility model provides a punching device for the inner side of a small-diameter bushing of a steering wheel, including an upper punching die 7 and a lower punching die 8;

[0040] The upper stamping die 7 is equipped with a punch pressure rod 20 and a protective pressure rod 22;

[0041] The lower stamping die 8 is provided with a positioning sleeve 1, a punch 30, a force-bearing body 32, and a protective block 40. The positioning sleeve 1 is provided with a punch 10. The workpiece is sleeved on the outside of the positioning sleeve 1. The punch 30 and the force-bearing body 32 are located inside the positioning sleeve 1. During the process of the upper stamping die 7 moving toward the lower stamping die 8, the protective block pressure rod 22 can abut against the protective block 40, so that it abuts against the workpiece and applies an inward force to the workpiece. The punch pressure rod 20 enters the interior of the positioning sleeve 1 and abuts against the force-bearing body 32, so that it drives the punch 30 to move toward the punch 10 to apply an inward force to the workpiece to achieve punching.

[0042] The device for punching the inner side of the small-diameter bushing of the steering wheel in this application has a punch 30 and a force-bearing body 32 set inside the positioning sleeve 1. The lower punch die 8 presses down, causing the punch pressure rod 20 to abut against the force-bearing body 32, which allows the punch 30 to move from the inside to the outside toward the punching hole 10, thus realizing punching from the inside to the outside. Before punching, the protective block pressure rod 22 can first abut against the protective block 40, so that it abuts against the workpiece and applies a force from the outside to the inside to the workpiece. This can effectively suppress the deformation of the workpiece during the punching process and protect the shape and quality of the workpiece. Setting the punch 30 and the force-bearing body 32 inside the small-diameter bushing expands the applicable range of punching, and can perform inside-to-out punching operations on small-diameter bushing workpieces 6, improving the flexibility and applicability of the equipment.

[0043] As a preferred embodiment of this application, see [link to application]. Figure 2 , Figure 5 , Figure 6 and Figure 7The force-bearing body 32 is provided with an inclined force-bearing surface 320. The force-bearing body 32 and the punch 30 are located on the slider 31, which is located in the slide groove 81. The end of the punch rod 20 is provided with an inclined force-applying surface 200. The inclined force-applying surface 200 vertically contacts the inclined force-bearing surface 320, which enables the force-bearing body 32 to move within the slide groove 81. The principle is that when the inclined force-applying surface 200 and the inclined force-bearing surface 320 are in contact, the slider 31 will be subjected to a horizontal component force. This horizontal thrust will push the slider 31 to move horizontally. Without the need for complex mechanical devices, the vertical descent of the punch rod 20 is sufficient to move the slider 31 laterally. This makes the system more reliable and stable. By reasonably designing the inclination angle of the inclined surface and the mass and friction parameters of the slider 31, precise control of the lateral movement of the slider 31 can be achieved.

[0044] As a preferred embodiment of this implementation, to solve the problem of collecting the waste sheets punched down by the punch 30 from the inside out, see [reference needed]. Figure 4 , Figure 5 , Figure 6 and Figure 7 The slider 31 is provided with a discharge chute 310, which is located on the other side of the punch 30. During the process of the punch 30 moving from the inside to the outside, the punch material can slide directly along the discharge chute 310 to the discharge port 80 of the lower die 8 for recycling, without causing accumulation and affecting subsequent stamping.

[0045] As a preferred embodiment of this implementation, see Figure 2 , Figure 5 and Figure 6 A reset block 33 is provided on one side of the slider 31, and a reset block pressure rod 21 is provided on the upper stamping die 7. The reset block pressure rod 21 abuts against the reset block 33 to push the slider 31 to move toward the punch 10 so as to reset the punch 30 and the force-bearing body 32 into the positioning sleeve 1.

[0046] In a preferred embodiment, the reset block 33 includes an insertion hole 330, the inner wall of which is provided with a vertical trapezoidal protrusion 331. The end of the reset block pressure rod 21 is provided with a first inclined surface 211, and the middle part is provided with a groove 213 with a second inclined surface 212. Before the punching begins, during the descent of the reset block pressure rod 21, the first inclined surface 211 contacts the inclined surface on the upper side of the trapezoidal protrusion 331, which enables the reset block 33 to abut against and push the slider 31 to move the punch 30 and the force-bearing body 32. The reset block moves into the positioning sleeve 1. Understandably, this step is not necessary and depends on the initial position of the reset block. During the punching 10, the slider 31 pushes the reset block 33 to move so that the trapezoidal protrusion 331 enters the groove 213. After the punching 10 is completed, the reset block pressure rod 21 moves upward, and the second inclined surface 212 contacts the inclined surface on the lower side of the trapezoidal protrusion 331, which enables the reset block 33 to abut against and push the slider 31 to move the punch 30 and the force-bearing body 32 into the positioning sleeve 1 to achieve reset.

[0047] The reset is achieved through the design of the reset block 33 and the reset block pressure rod 21, instead of using the conventional reset spring 42. The reasons are as follows: Firstly, the reset spring 42 will experience a decrease in elasticity after prolonged use, which will affect the reset accuracy and distance, leading to changes in the impact force and stroke of the punch 30, and compromising the punching quality. Therefore, the reset spring 42 requires regular inspection and replacement. Secondly, the elastic deformation of the reset spring 42 will not disappear instantly, so the reset block 33 needs time to settle before the next bushing workpiece 6 can be processed. The cooperation between the reset block 33 and the reset block pressure rod 21 in this application ensures that the punch 30 can always be reset to the optimal design position during continuous stamping operations, thus reducing costs and increasing efficiency.

[0048] As a preferred embodiment of this application, the protective block 40 is provided with an arc-shaped surface 401 to fit the outer side of the sleeve-type workpiece. In this application, three protective blocks 40 are provided, and the arc-shaped surfaces 401 of the three protective blocks 40 can be enclosed into a circle to apply a more uniform anti-deformation force to the workpiece.

[0049] Furthermore, the protective block 40 is located on the upper side of the slider 31. The protective block 40 is provided with a relief groove 402, and the punch 30 and the force-bearing body 32 can move into the relief groove 402 to ensure that the protective block 40 has a large contact surface with the workpiece.

[0050] As a preferred implementation of this application, the protective block 40 is provided with a third inclined surface 220, and the protective block pressure rod 22 is provided with a fourth inclined surface 400. When the protective block pressure rod 22 descends and the fourth inclined surface 400 contacts the third inclined surface 220, the protective block 40 can move toward the positioning sleeve 1. This is the same principle as the horizontal movement of the punch 30, and will not be described in detail here.

[0051] Furthermore, the protection block 40 does not need to be precisely reset like the punch 30. Therefore, it can be reset by means of the reset spring 42. The reset spring is set between the protection block 40 and the fixed block 41 to achieve the reset of the protection block.

[0052] In a preferred embodiment of this application, the lower stamping die 8 is provided with multiple spring positioning rods, which are arranged around the positioning sleeve 1. Each spring positioning rod has a receiving part 500, and the workpiece is placed on the receiving part 500. The upper stamping die 7 presses down the spring positioning rods to make the workpiece fit outside the positioning sleeve 1. The upper stamping die 7 raises the spring positioning rods to lift the workpiece for easy collection. This prevents the punch 30 from moving towards the positioning sleeve 1 and resetting to the first position when the lowering unit rises, thus avoiding the force exerted on the bushing workpiece 6, which is fitted on the positioning sleeve 1 and loses the abutment of the protective block 40. In this state, the bushing workpiece 6 may rotate slightly due to the vibration of the device. The resetting of the punch 30 will squeeze the un-drilled part of the bushing workpiece 6, causing the already processed workpiece sleeve to deform or produce scratches, etc.

[0053] See Figure 1-8 As shown, during the inner punching operation of the small-diameter bushing, the bushing workpiece 6 is placed in the receiving part 500 by a manual or robotic arm. The upper punching die 7 descends, causing the bushing workpiece 6 to be fitted onto the outside of the positioning sleeve 1. The protective block pressure rod 22 and the reset block pressure rod 21 first contact their respective protective blocks 40 and reset blocks 33, so that the protective block 40 abuts against the outer wall of the bushing workpiece 6 and the punch 30 is located inside the positioning sleeve 1. The punch pressure rod 20 then contacts the punch 30, causing the punch 30 to move from the inside to the outside to punch the bushing workpiece 6. The punched material falls into the discharge chute 310 and slides down to the discharge port 80. During the upward movement of the upper punching die 7, the protective block 40 returns to its initial position under the action of the reset spring 42. The bushing workpiece 6 is lifted away from the positioning sleeve 1 by the spring positioning rod 50. The reset block pressure rod 21 pushes the reset block 33 to abut against the slider 31, causing the punch 30 to return to the positioning sleeve 1, completing the entire operation.

[0054] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0055] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A device for punching holes on the inner side of a small-diameter steering wheel sleeve, characterized in that: It includes a stamping upper die and a stamping lower die; The stamping upper die is provided with a punch pressure rod and a protection block pressure rod; The stamping lower die is provided with a positioning sleeve, a punch, a force-bearing body and a protection block; the positioning sleeve is provided with a punching hole, the workpiece is sleeved on the outside of the positioning sleeve, the punch and the force-bearing body are arranged in the positioning sleeve, and during the movement of the stamping upper die toward the stamping lower die, the protection block pressure rod can abut the protection block so that it abuts against the workpiece and applies a force from the outside to the inside to the workpiece, and the punch pressure rod enters the interior of the positioning sleeve to abut the force-bearing body so that it drives the punch to move in the direction of the punching hole to apply a force from the inside to the outside to the workpiece to achieve punching.

2. The device for punching inner side of a small diameter steering wheel sleeve according to claim 1, characterized in that: The force-bearing body is provided with an inclined force-bearing surface, the force-bearing body and the punch are arranged on a slider, the slider is arranged in a slide groove, and the end of the punch pressure rod is provided with an inclined force-applying surface, and the inclined force-applying surface vertically contacts the inclined force-bearing surface to enable the force-bearing body to move in the slide groove.

3. The device for punching inner side of a small diameter steering wheel sleeve according to claim 2, characterized in that: The slide block is provided with a blanking chute, which is arranged on one side of the punch and is used to receive the punching material. The punching material can slide along the blanking chute to the blanking opening of the stamping lower die.

4. The device for punching inner side of a small diameter steering wheel sleeve according to claim 2, characterized in that: A reset block is provided on one side of the slider, and a reset block pressure rod is provided on the stamping upper die. The reset block pressure rod abuts against the reset block to push the slider toward the punching direction to realize the reset of the punch and the force-bearing body into the positioning sleeve.

5. The device for punching inner side of a small diameter steering wheel sleeve according to claim 4, characterized in that: The reset block includes an insertion hole, the inner wall of the insertion hole is provided with a vertical trapezoidal protrusion, the end of the reset block pressure rod is provided with a first inclined surface, and the middle part is provided with a groove with a second inclined surface; before punching starts, during the descending process of the reset block pressure rod, the first inclined surface contacts the inclined surface on the upper side of the trapezoidal protrusion, so that the reset block can abut against the push slider to move the punch and the force-bearing body into the positioning sleeve; during punching, the slider pushes the reset block to move the trapezoidal protrusion into the groove; after punching is completed, the reset block pressure rod moves upward, and the second inclined surface contacts the inclined surface on the lower side of the trapezoidal protrusion, so that the reset block can abut against the push slider to move the punch and the force-bearing body into the positioning sleeve to achieve reset.

6. The device for punching inner side of a small diameter steering wheel sleeve according to claim 1, characterized in that: The protection block is provided with an arc surface to fit the outer side of the workpiece.

7. The device for punching inner side of a small diameter steering wheel sleeve according to claim 2, characterized in that: The protection block is located on the upper side of the sliding block, and the protection block is provided with an avoidance groove, and the punch and the force-bearing body can move into the avoidance groove.

8. The device for punching inner side of a small diameter steering wheel sleeve according to claim 1, characterized in that: The protection block is provided with a third inclined surface, and the protection block pressure rod is provided with a fourth inclined surface. When the protection block pressure rod descends to make the fourth inclined surface contact with the third inclined surface, the protection block can move toward the positioning sleeve.

9. The device for punching inner side of a small diameter steering wheel sleeve according to claim 1, characterized in that: The protection block is reset by a reset spring.

10. The device for punching inner side of a small diameter steering wheel sleeve according to claim 1, characterized in that: The stamping lower die is provided with a plurality of spring positioning rods, and the plurality of spring positioning rods are arranged around the positioning sleeve. The spring positioning rods are provided with a receiving portion, and the workpiece is arranged on the receiving portion. The stamping upper die presses down the spring positioning rods so that the workpiece is sleeved on the outside of the positioning sleeve. The stamping upper die raises the spring positioning rods to lift the workpiece for easy collection.

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