Small-diameter slotted bushing rolling device and slotted bushing

Abstract

This utility model discloses a small-diameter slotted bushing rolling device and a slotted bushing, belonging to the field of slotted bushing production technology. The device includes: a conveying section for conveying strip material along a first direction; a guiding section for applying force to the continuously moving strip material along the first direction to drive the strip material to bend in a direction deviating from the first direction; and a cutting section for cutting the strip material to separate the bent strip material portion to form individual slotted bushings. The strip material moves from the conveying section to the guiding section, where it begins to bend and moves towards the closing direction under the guidance of the guiding section. After rolling to form an overlap, the cutting section cuts the strip material to a preset length to form individual slotted bushings. This device has a simple structure and good synchronization between strip cutting and rolling. The slotted bushings produced by this device have high processing precision.

Description

Technical Field

[0001] This utility model relates to the field of slotted bushing production technology, specifically to a small-diameter slotted bushing rolling device and a slotted bushing. Background Technology

[0002] A slotted bushing is a special metal sleeve with an axial slit, primarily used in cold extrusion strengthening processes for bushings. This process is the most widely used and mature internal hole strengthening technology. The process involves inserting a slotted bushing into the hole, with the bushing in contact with the hole wall. An extrusion bar is then forced through the hole with an interference fit, plastically expanding the bushing. The material near the hole wall also undergoes plastic deformation, forming a residual compressive stress layer. This stress layer counteracts the applied load, thus improving fatigue life. The slotted bushing prevents scratch damage caused by direct contact between the extrusion bar and the hole wall, enabling high-interference extrusion. It is evident that the slotted bushing is crucial for ensuring the effectiveness of cold extrusion strengthening during the extrusion process.

[0003] Currently, traditional slotted bushing production equipment has a complex structure and poor synchronization between strip cutting and strip rolling, resulting in insufficient processing accuracy for slotted bushings, especially small-diameter slotted bushings. Utility Model Content

[0004] The present invention aims to solve the above problems and provides a small-diameter slit bushing rolling device and slit bushing with simple structure, tight component fit and high processing accuracy.

[0005] To solve the above problems, this utility model provides a device for rolling small-diameter slit bushings, characterized in that the device includes:

[0006] A conveying section is used to convey the strip along a first direction;

[0007] A guide section is used to apply a force to a strip that is continuously traveling in a first direction, so as to drive the strip to bend in a direction deviating from the first direction;

[0008] A cutting section is used to cut the strip to separate the bent strip portion to form a single slotted bushing.

[0009] Furthermore, the device also includes a limiting part for constraining the strip to be conveyed along a first direction.

[0010] Furthermore, the limiting part includes a first limiting block and a second limiting block, which are respectively arranged on both sides of the first direction.

[0011] Furthermore, the second limiting block has a guide portion at one end away from the conveying section. The guide portion is used to drive the curved strip forward in the closing direction to form an overlap with the strip portion in the first direction.

[0012] Furthermore, the conveying unit includes several pairs of symmetrically arranged drive wheels, which are driven by a motor to drive the strip through at a uniform speed.

[0013] Furthermore, the drive wheels are arranged symmetrically along the first direction.

[0014] Furthermore, the guide portion includes a rotatable guide wheel for guiding the strip to bend into a predetermined curvature by contact with the strip.

[0015] Furthermore, the position of the guide portion is adjustable.

[0016] Furthermore, the limiting part is disposed between the conveying part and the guiding part along the first direction.

[0017] Furthermore, the cutting blade of the cutting part is disposed between the limiting part and the guide wheel along the first direction.

[0018] Furthermore, the cutter cuts the strip along a second direction perpendicular to the first direction.

[0019] Furthermore, this utility model also provides a slit bushing, which is prepared by the aforementioned small-diameter slit bushing rolling device.

[0020] The beneficial contribution of this utility model lies in its effective solution to the aforementioned problems. The design structure of the small-diameter slotted bushing rolling device of this utility model is simple. The strip is conveyed by the conveyor and comes into contact with the guide wheel. Under the force applied by the guide wheel, the strip begins to bend. The bent strip is then cut by the cutting part to form individual slotted bushings. Furthermore, the cutting part of this utility model has a preset length, and the cutting part precisely cuts the strip according to the preset length, improving the processing accuracy of slotted bushings, especially small-diameter slotted bushings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structural principle of the small-diameter slit bushing rolling device of this utility model.

[0022] Figure 2 The small-diameter slit bushing is prepared by a small-diameter slit bushing rolling device.

[0023] Reference numerals in the attached drawings: conveyor 10, drive wheel 11, strip 20, guide 30, guide wheel 31, limiting part 40, first limiting block 41, second limiting block 42, guide part 420, inlet end 421, outlet end 422, cutting part 50, cutter 51, cutting seam 60. Detailed Implementation

[0024] The following embodiments are further explanations and supplements to the present invention and do not constitute any limitation on the present invention.

[0025] like Figure 1 As shown, this example provides a small-diameter slotted bushing rolling device, including a conveying part 10, a guiding part 30 and a cutting part 50, which are respectively used for driving the strip 20, guiding and forming the strip 20 and cutting the strip 20 to process a single slotted bushing.

[0026] The conveying section 10 is used to convey the strip 20 along a first direction to the guide section 30; the guide section 30 is used to apply a force to the strip 20 traveling continuously along the first direction to drive the strip 20 to bend in a direction deviating from the first direction to form a basic shape of a generally cylindrical slotted bushing; the cutting section 50 is used to cut the strip 20 to cut and separate the bent strip 20 portion to form a single slotted bushing.

[0027] Furthermore, the conveying unit 10 includes several pairs of drive wheels 11 symmetrically arranged along the first direction. The drive wheels 11 are driven by a motor, and the rotation of the multiple pairs of drive wheels 11 drives the strip 20 to move at a constant speed along the first direction.

[0028] Furthermore, the number of drive wheels 11 is not limited, but preferably there are an even number of drive wheels 11, symmetrically distributed on both sides of the first direction. When there are multiple drive wheels 11, the multiple drive wheels 11 are spaced apart or arranged adjacent to each other along the first direction. In this embodiment, there are a total of 4 drive wheels 11, symmetrically distributed along the first direction, with 2 on each side.

[0029] The guide portion 30 is used to apply a force to the strip 20 that is continuously traveling in the first direction, so as to drive the strip 20 to bend in a direction deviating from the first direction.

[0030] The guide section 30 includes a rotatable cylindrical guide wheel 31, which guides the strip 20 to bend and form a predetermined curvature through contact with the strip 20. Specifically, the strip 20, driven to move at a uniform speed by the conveyor section 10, contacts the guide wheel 31. The guide wheel 31 guides the strip 20 to deviate in a direction deviating from the first direction, causing the strip 20 to bend and gradually form an arc shape, ultimately achieving rounding. Furthermore, the guide wheel 31 applies pressure to the strip 20 to ensure that the strip 20 remains stable during bending, preventing deformation or twisting.

[0031] Furthermore, the height (axial dimension, i.e., height) of the guide wheel 31 is slightly greater than the width of the strip 20, i.e., the contact line between the strip 20 and the guide wheel 31 and the width of the strip 20, so that the strip 20 is uniformly subjected to the pressure applied by the guide wheel 31.

[0032] Furthermore, the guide portion 30 can move along the first direction. By setting the guide portion 30 at different positions, the diameter of the slotted bushing can be adjusted. Moving the guide portion 30 along the first direction away from the drive wheel 11 can be used to produce slotted bushings with a smaller diameter; conversely, moving the guide portion 30 along the first direction towards the drive wheel 11 can be used to produce slotted bushings with a larger diameter.

[0033] Furthermore, the guide wheel 31 can move along a second direction perpendicular to the first direction to adjust the diameter of the slotted bushing. The second direction is perpendicular to the plane containing the strip 20. When the distance between the axis of symmetry L of the circular cross-section of the guide wheel 31 along the first direction and the axis of symmetry S of the drive wheel 11 of the conveying unit 10 along the first direction decreases, it can be used to produce bushings with smaller diameters; conversely, when the distance between the axis of symmetry L of the circular cross-section of the guide wheel 31 along the first direction and the axis of symmetry S of the drive wheel 11 of the conveying unit 10 along the first direction increases, it can be used to produce bushings with larger diameters.

[0034] Furthermore, with the guide portion 30 remaining in the same position, the bushing diameter can be adjusted by replacing the guide rollers 31 with different diameters. Specifically, the larger the diameter of the guide roller 31, the smaller the diameter of the produced bushing; conversely, the smaller the diameter of the guide roller 31, the larger the diameter of the produced bushing.

[0035] Furthermore, the guide wheel 31 is positioned such that the two ends of the guide wheel 31 that are furthest apart along the second direction are located on both sides of the first direction, so that after the strip 20 comes into contact with the guide wheel 31, it helps the strip 20 to form an arc shape and finally achieve roll.

[0036] In some embodiments, the structure of the present invention further includes a limiting part 40, which is used to constrain the strip 20 to move along the first direction in order to avoid indentation damage to the surface of the strip 20 and to adjust the lateral direction of the strip 20 to prevent the strip 20 from shifting.

[0037] The limiting part 40 includes a first limiting block 41 and a second limiting block 42. The first limiting block 41 and the second limiting block 42 are respectively arranged on both sides of the first direction. A limiting space is formed between the first limiting block 41 and the second limiting block 42 for the strip 20 to pass through the limiting part 40, so as to constrain the strip 20, prevent damage to the strip 20 and prevent the strip 20 from deviating.

[0038] Furthermore, the number of the first limiting block 41 and the second limiting block 42 is not limited. In this embodiment, the number of the first limiting block 41 and the second limiting block 42 is one.

[0039] Furthermore, the plane of the second limiting block 42, which forms a limiting space with the first limiting block 41, is on the same horizontal plane as the axis of symmetry of the drive wheel 11 of the conveying section 10 along the first direction, and is used to provide a constraint effect on the conveying of the strip 20 along the first direction.

[0040] Furthermore, the limiting part 40 is made of an elastic material, such as rubber with a certain degree of elasticity. Within the limiting space, the first limiting block 41 has a pair of limiting strips parallel to the first direction on both sides, forming a limiting channel for the strip 20 to pass through. The width of the limiting channel is slightly larger than the width of the strip 20. The limiting channel is used to prevent indentation damage to the surface of the strip 20 through elastic contact and to adjust the lateral direction of the strip 20, preventing the strip 20 from shifting. Specifically, the limiting strips can also be provided on the second limiting block 42, or both the first limiting block 41 and the second limiting block 42 can have limiting strips.

[0041] Furthermore, the limiting strip is parallel to the axis of symmetry of the drive wheel 11 of the transmission unit 10 along the first direction.

[0042] Furthermore, the second limiting block 42 is provided with a guide part 420 at one end away from the conveying part 10. The guide part 420 is used to drive the curved strip 20 forward in the closing direction and form an overlap with the part of the strip 20 in the first direction.

[0043] Furthermore, the guide portion 420 is semi-circular or arc-shaped.

[0044] Further, for ease of description, taking the direction of movement of the strip 20 as a reference, the end of the guide section 420 near where the strip 20 enters is called the inlet end 421, and the end near where the strip 20 exits is called the outlet end 422. The inlet end 421 and the outlet end 422 are connected by an arc-shaped surface, and the distance between the inlet end 421 and the axis of symmetry S of the drive wheel 11 of the conveying section 10 along the first direction is greater than the distance between the outlet end 422 and the axis of symmetry S of the drive wheel 11 of the conveying section 10 along the first direction; the distance between the inlet end 421 and the axis of symmetry of the circular cross section of the guide wheel 31 along the second direction is greater than the distance between the outlet end 422 and the axis of symmetry of the circular cross section of the guide wheel 31 along the second direction. In this way, after the strip 20 is bent by the guide section 30, when it enters the guide section 420, it can move in the closing direction under the action of the guide section 420 and form an overlap with the strip 20 portion in the first direction.

[0045] During operation, the strip 20 enters the limiting channel of the limiting section 40 under the drive of the drive wheel 11 of the conveying section 10. After leaving the limiting channel, the strip 20 advances to contact the guide wheel 31. Guided by the guide wheel 31, the strip 20 bends and tends to curl, then bends forward to contact the guide section 420. Guided by the guide section 420, it advances in the closing direction and forms an overlap with the portion of the strip 20 in the first direction. The overlap refers to the end portion of the strip 20 overlapping with other portions in the thickness direction, but the two are not fixedly connected. In this way, when cutting is performed at or near the overlap portion, a single slit bushing can be cut.

[0046] The cutting section 50 is used to cut the strip 20 to separate the curved strip 20 portion to form a single slotted bushing.

[0047] Furthermore, the limiting part 40 along the first direction is located between the conveying part 10 and the guide part 30.

[0048] For cutting, the cutting unit 50 includes a cutter 51 and a servo control system. The cutter 51 is used to cut the rolled strip 20 with an overlap into individual slit bushings; the servo system is used to control the cutter 51 to cut the strip 20 to a preset length to form individual slit bushings. The preset bushing length refers to the length of the strip 20 that travels in a first direction, which is the cross-sectional perimeter of the individual bushing after cutting.

[0049] In order to achieve precise cutting, the servo control system has a preset bushing length. When the strip 20 reaches the preset length and the strip 20 is rolled into a circle to form an overlap, the cutter 51 automatically cuts the strip 20 and separates the formed slit bushing.

[0050] Furthermore, the cutting position of the cutter 51 is determined according to the size of the slit bushing to be produced. In some embodiments, the cutting position of the cutter 51 is located in the overlap area formed after the strip 20 is rolled into a circle.

[0051] In some embodiments, the cutting position of the cutter 51 is located at the edge of the overlap area formed after the strip 20 is rolled into a circle.

[0052] Furthermore, the cutter 51 is a high-speed rotating blade. High-speed rotating cutting can make the cut smooth and burr-free, and can prevent the strip 20 from warping or cracking due to stress changes.

[0053] Furthermore, when the cutter 51 is working, it can move along the second direction, and when cutting is required, it moves along the second direction toward the strip 20 to cut the strip 20; after cutting is completed, it moves along the second direction away from the strip 20 until it maintains a certain distance from the strip 20.

[0054] Furthermore, when cutting is required and the blade moves in the direction of the strip 20 along the second direction, the blade 51 begins to rotate; when cutting is completed and the blade moves away from the strip 20 along the second direction, the blade 51 stops rotating.

[0055] Furthermore, in the first direction, the cutter 51 is located between the limiting part 40 and the guide part 30.

[0056] Furthermore, the cutter 51 is located on the side opposite to the guide portion 420 in the first direction.

[0057] Furthermore, the cutter 51 cuts the strip 20 along a second direction perpendicular to the first direction.

[0058] like Figure 2 As shown, this example provides a small-diameter slotted bushing, which is prepared by a small-diameter slotted bushing rolling device. The small-diameter slotted bushing is rolled from strip 20 and is a hollow cylinder with a longitudinal cut slit 60.

[0059] Furthermore, the cut slit 60 is uniform in width, straight without bending, and the edges on both sides of the slit are parallel to each other.

[0060] Furthermore, the unfolded surface of the small-diameter slit bushing is rectangular.

[0061] Although the present invention has been disclosed through the above embodiments, the scope of the present invention is not limited thereto. Without departing from the concept of the present invention, the above components can be replaced by similar or equivalent elements known to those skilled in the art.

Claims

1. A device for rolling small-diameter slit bushings, characterized in that, The device includes: The conveying unit (10) is used to convey the strip (20) along a first direction; The guide (30) is used to apply force to the strip (20) that is traveling continuously in the first direction, so as to drive the strip (20) to bend in a direction deviating from the first direction; The cutting section (50) is used to cut the strip (20) to separate the curved strip (20) portion to form a single slotted bushing.

2. The small-diameter slotted bushing rolling device as described in claim 1, characterized in that: The device further includes a limiting part (40) for constraining the strip (20) to be conveyed along a first direction.

3. The small-diameter slit bushing rolling device as described in claim 2, characterized in that: The limiting part (40) includes a first limiting block (41) and a second limiting block (42), with the first limiting block (41) and the second limiting block (42) respectively arranged on both sides of the first direction.

4. The small-diameter slotted bushing rolling device as described in claim 3, characterized in that: The second limiting block (42) has a guide (420) at one end away from the conveying part (10). The guide (420) is used to drive the curved strip (20) forward in the closing direction and form an overlap with the strip (20) in the first direction.

5. The small-diameter slit bushing rolling device as described in claim 1, characterized in that: The conveying unit (10) includes several pairs of symmetrically arranged drive wheels (11), which are symmetrically arranged along a first direction. The drive wheels (11) are driven by a motor to drive the strip (20) through at a constant speed.

6. The small-diameter slotted bushing rolling device as described in claim 1, characterized in that: The guide portion (30) includes a rotatable guide wheel (31) for guiding the strip (20) to bend into a predetermined curvature by contacting the strip (20).

7. The small-diameter slit bushing rolling device as described in claim 2 or 3, characterized in that: The limiting part (40) is disposed between the conveying part (10) and the guiding part (30) along the first direction.

8. The small-diameter slotted bushing rolling device as described in claim 2, characterized in that: The cutter (51) of the cutting part (50) is disposed between the limiting part (40) and the guide wheel (31) along the first direction.

9. The small-diameter slotted bushing rolling device as described in claim 8, characterized in that: The cutter (51) cuts the strip (20) in a second direction perpendicular to the first direction.

10. A slotted bushing, characterized in that, It is prepared by the small-diameter slotted bushing rolling device as described in any one of claims 1 to 9.

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