Low-friction slotted lining forming device

Abstract

The utility model discloses a low-friction slotted lining forming device, which belongs to the technical field of slotted lining production and comprises a rack, a driving mechanism, a clamping piece, a forming block and a cutting knife, and the driving mechanism, the clamping piece, the forming block and the cutting knife are arranged on the same side of the rack. The rack comprises a working face, and the strip penetrates through the driving mechanism along the working face and is clamped through the clamping piece. The clamping piece is provided with a forming groove; the forming block and the cutting knife are in sliding fit with the rack, the forming block is rotationally provided with a forming wheel, after the forming block slides, the outer side of the forming wheel is close to the clamping piece and abuts against the end of the strip, the strip is formed in a hollow rolling mode in the forming groove, the rolled strip is cut after the cutting knife slides, and the slotted lining is formed. According to the forming die, the friction force at the stress point in the forming process of the slotted lining can be reduced, forming of the slotted lining is facilitated, meanwhile, damage to the outer side surface of the slotted lining is reduced, and the forming quality of the slotted lining is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of slotted bushing production, in particular to a low-friction slotted bushing forming device. Background Art

[0002] The cold extrusion strengthening technology of slotted bushings has the characteristics of large interference, strong operability and high extrusion quality. It can significantly improve the fatigue life of the fastening holes of structural parts, and can also effectively improve its resistance to stress corrosion and corrosion fatigue. It has been widely used in the strengthening of aircraft fastening holes and has achieved good results. The slotted bushing is an important component in the cold extrusion strengthening technology of slotted bushings. In the process of cold extrusion strengthening of slotted bushings, due to the use of slotted bushings, the damage of the hole during the extrusion process and the accumulation of extrusion port materials are avoided, the tension of the extrusion mandrel is reduced, and the radial extrusion deformation is efficiently transferred to the hole wall, ensuring the tangential residual compressive stress in the hole. Therefore, the slotted bushing is a key factor in ensuring its cold extrusion strengthening effect and quality.

[0003] At present, slit bushings are usually formed by auxiliary rolling with a core rod, or by automatic guiding without a core rod. In the continuous production process of slit bushings, multiple functional mechanisms are arranged on the same frame to realize the production of slit bushings in multiple processes on the same frame, such as CN114535411A, a slit bushing manufacturing device and method, which acts on the strip in a certain order through a pressing block, a lower cutter, an upper cutter, and a forming pressing block, so that the strip is rolled on a rigid core rod. After the strip is rolled on the rigid core rod, it is cut to form a slit bushing. However, during the extrusion process of the strip, the strip is subjected to a large extrusion force at the stress point, so that when the strip moves over, the stress point is simultaneously subjected to a large friction force, which is not conducive to the forming of the slit bushing. At the same time, it is also easy to cause damage to the outer surface of the slit bushing, affecting the quality of the slit bushing. Utility Model Content

[0004] The utility model aims to provide a slit bushing forming device to solve the problem that in the production process of the existing slit bushing, the strip is subjected to large extrusion force and friction force at the stress point, which is not conducive to the forming of the slit bushing and is also easy to cause damage to the outer surface of the slit bushing, thereby affecting the quality of the slit bushing.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A low-friction slotted bushing forming device comprises: a frame, a driving mechanism, a clamping member, a forming block and a cutting knife arranged on the same side of the frame;

[0007] The frame includes a working surface, along which the strip passes through a driving mechanism and is clamped by a clamping member; the clamping member is provided with a forming groove; a forming block and a cutting knife are respectively slidably matched with the frame, and a forming wheel is provided on the forming block for rotation. After the forming block slides, the outer side of the forming wheel approaches the clamping member and abuts against the end of the strip, so that the strip is hollow rolled and formed in the forming groove, and the cutting knife slides to cut the rolled and formed strip to form a slit bushing.

[0008] Furthermore, the forming block comprises a mounting end and a forming end, the forming end is provided with a mounting groove, the forming wheel is rotatably arranged in the mounting groove via a rotating shaft, and the forming wheel partially extends out of the mounting groove for abutting against the end of the strip.

[0009] Furthermore, the forming wheel is rotatably embedded in the forming block and partially extends out of the forming block to abut against the end of the strip.

[0010] Furthermore, when the forming wheel abuts against the strip, the center of the forming wheel and the forming groove are respectively located on both sides of the working surface.

[0011] Furthermore, the above-mentioned clamping member is rectangular, and includes a feed end and a discharge end. The feed end is close to the driving mechanism. The clamping member is provided with a strip hole along its extension direction, whose cross-section matches the cross-section of the strip, so that the strip is clamped in the strip hole and the strip and the strip hole are slidably matched; the forming groove is located at the discharge end of the clamping member and on one side of the strip hole.

[0012] Furthermore, the clamping member is rotatably provided with a support wheel at a position where the strip hole and the discharge end are connected, and the support wheel and the forming groove are respectively located on both sides of the strip hole.

[0013] Furthermore, the supporting wheel is rotatably embedded in the clamping member, and the outer side of the supporting wheel extends to the strip hole and the discharge end.

[0014] Furthermore, the forming block and the cutting knife are arranged oppositely and obliquely on both sides of the working surface, and the cutting knife and the forming groove are located on both sides of the working surface; after the cutting knife slides, it cuts the strip and enters the forming groove from the top of the forming groove.

[0015] The utility model has the following beneficial effects:

[0016] (1) The utility model provides a forming wheel on the forming block, and the strip is bent on the surface of the forming wheel. During the movement of the strip, the forming wheel is driven to rotate, thereby reducing the friction of the strip at the stress point on the forming wheel, which is beneficial to the forming of the slit bushing, while reducing the damage to the outer surface of the slit bushing, thereby improving the forming quality of the slit bushing.

[0017] (2) The strip of the utility model is extruded and formed with a forming wheel after passing through the strip hole. The strip will receive an extrusion force at the end of the strip hole. The utility model is provided with a supporting wheel at the end of the strip hole. During the movement of the strip, the supporting wheel will be driven to rotate, thereby reducing the friction of the strip at the force point on the supporting wheel, which is beneficial to the forming of the slit bushing, while reducing the damage to the outer surface of the slit bushing, thereby improving the forming quality of the slit bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a low-friction slotted bushing forming device of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the clamping member of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the forming end of the forming block of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the low-friction slotted bushing forming device of the utility model when rolling the slotted bushing;

[0022] In the figure: 10-frame; 11-working surface; 20-driving mechanism; 30-clamping member; 31-forming groove; 32-strip hole; 33-support wheel; 40-forming block; 41-forming wheel; 42-mounting groove; 43-rotating shaft; 50-cutting knife; 60-strip. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] Please refer to Figures 1 to 3 The present embodiment provides a low-friction slotted bushing forming device, comprising: a frame 10, a driving mechanism 20, a clamping member 30, a forming block 40 and a cutting knife 50 arranged on the same side of the frame 10. The frame 10 comprises a transversely arranged working surface 11, and a strip 60 moves along the working surface 11 on the same side of the frame 10 until a slotted bushing is formed. The driving mechanism 20, the clamping member 30, the forming block 40 and the cutting knife 50 are all arranged close to the working surface 11, and are respectively used for driving the strip 60, clamping the strip 60, forming the strip 60 and cutting the strip 60.

[0025] Since one side of the strip 60 has a coating, when rolling, the side of the strip 60 having the coating is rolled inside, that is, the inner side of the formed slit bushing has a coating.

[0026] The driving mechanism 20 adopts an existing driving method that can drive the strip 60 to move, such as a roller conveying mechanism, which drives the strip 60 to move by rotating multiple pairs of rollers. The specific structure belongs to the existing technology and will not be repeated here.

[0027] The cross section of the clamping member 30 is rectangular or circular or other irregular shapes, depending on the installation requirements on the frame 10, and includes a feed end and a discharge end, the feed end is close to the drive mechanism 20, and the discharge end is far away from the drive mechanism 20. The clamping member 30 is provided with a strip hole 32 along its extension direction, and the cross section of the strip hole 32 matches the cross section of the strip 60, so that the strip 60 is clamped in the strip hole 32 and the strip 60 and the strip hole 32 are slidably matched, that is, when the strip 60 is in the strip hole 32, the strip 60 will not swing under the restriction of the drive mechanism 20 and will not move in the extension direction.

[0028] In order to facilitate the formation of the strip-shaped hole 32 , in the present embodiment, the clamping member 30 includes a first clamping member and a second clamping member connected by bolts, and the strip-shaped hole 32 is formed between the first clamping member and the second clamping member.

[0029] The discharge end of the clamp 30 is provided with an arc-shaped forming groove 31, which is located at the lower side of the strip hole 32 and close to the strip hole 32, at which time the strip 60 is bent downward and rolled into shape. Obviously, the forming groove 31 can also be located at the upper side of the strip hole 32 and close to the strip hole 32, at which time the strip 60 is bent upward and rolled into shape. The forming groove 31 can be semicircular or arc-shaped, or can extend to the bottom of the clamp 30, etc. The specific shape is based on whether the slit bushing formed after cutting can automatically fall off.

[0030] In this embodiment, the clamping member 30 is rotatably provided with a support wheel 33 at the position where the strip hole 32 and the discharge end meet. The support wheel 33 and the forming groove 31 are respectively located on both sides of the strip hole 32, that is, when the strip 60 is bent downward to form, the top of the strip hole 32 has a force point, and the support wheel 33 is arranged at this force point. During the movement of the strip 60, the support wheel 33 will be driven to rotate, thereby reducing the friction of the strip 60 at the force point on the support wheel 33, which is conducive to the forming of the slit bushing, while reducing the damage to the outer surface of the slit bushing, and improving the forming quality of the slit bushing. Similarly, when the strip 60 is bent upward to form, the bottom of the strip hole 32 has a force point.

[0031] In this embodiment, the support wheel 33 is arranged in such a way that the support wheel 33 is rotatably embedded in the clamp 30. Specifically, a through hole is provided at the discharge end of the clamp 30. The size of the through hole matches the size of the support wheel 33. The outer circle of the through hole extends to the discharge end and the strip hole 32, that is, the through hole has a 1 / 4 circle gap at the strip hole 32. Then, the support wheel 33 is rotatably installed in the through hole, and then both ends of the through hole are blocked. Therefore, the outer side of the support wheel 33 also extends to the discharge end and the strip hole 32. The support wheel 33 can not only be confined in the through hole, but also can be rotated. In other embodiments of the utility model, a blind hole can also be provided at the discharge end of the clamp 30, and the blind hole passes through the strip hole 32.

[0032] The forming block 40 is slidably disposed on the frame 10 and is located on the same side of the working surface 11 as the forming groove 31, that is, in this embodiment, the forming block 40 is located on the lower side of the working surface 11. The forming block 40 includes a mounting end and a forming end, and the forming end is provided with a mounting groove 42. The forming wheel 41 is rotatably disposed in the mounting groove 42 through a rotating shaft 43, and the forming wheel 41 partially extends out of the mounting groove 42 to abut against the end of the strip 60. Therefore, the position where the strip 60 contacts the forming wheel 41 is also the force point of the strip 60. The forming of the strip is achieved through the joint action of the forming block 40 and the clamping member 30.

[0033] In this embodiment, the center line of the forming wheel 41 is perpendicular to the working surface 11 , and the center line of the forming wheel 41 and the forming groove 31 are respectively located on two sides of the working surface 11 .

[0034] When the strip 60 moves, it will drive the forming wheel 41 to rotate, thereby reducing the friction of the strip 60 at the stress point on the forming wheel 41, which is beneficial to the forming of the slit bushing, while reducing the damage to the outer surface of the slit bushing and improving the forming quality of the slit bushing.

[0035] The cutting knife 50 is slidably disposed on the frame 10, and is opposite to the forming block 40 and obliquely disposed on both sides of the working surface 11, so the cutting knife 50 and the forming groove 31 are respectively located on both sides of the working surface 11. In this embodiment, the cutting knife 50 is located on the upper side of the working surface 11. Since the cutting knife 50 is in an inclined state, the cutting knife 50 cuts the strip 60 after sliding and enters the forming groove 31 from the top of the forming groove 31. Therefore, the blade of the cutting knife 50 is an upper cutting edge, and the top of the forming groove 31 is a lower cutting edge. The upper cutting edge and the lower cutting edge work together to cut the slit bushing.

[0036] In this embodiment, the forming block 40 and the cutting knife 50 are respectively slidably matched with the frame 10 through a sliding mechanism. The sliding mechanism adopts an existing slider and a slide groove matching mechanism. Each component is installed on the slider, and the slide groove is set on the frame 10. The driving method of the sliding mechanism can be motor drive, hydraulic drive, etc.

[0037] In other embodiments of the present invention, the cutting blade 50 and the forming block 40 may also be disposed on the same side of the working surface 11 . In this case, the cutting blade 50 , the forming block 40 and the forming groove 31 are respectively located on both sides of the working surface 11 .

[0038] The process of producing a slit bushing by the low-friction slit bushing forming device of this embodiment is as follows:

[0039] (1) The driving mechanism 20 drives the strip 60 to move forward, so that the strip 60 passes through the forming block 40 and moves to the discharge end of the forming block 40. The discharge end of the forming block 40 is the starting position of rolling;

[0040] (2) The forming block 40 slides to make the forming wheel 41 close to the forming groove 31;

[0041] (3) The driving mechanism 20 continues to drive the strip 60 to move forward, and the end of the strip 60 bends downward after contacting the forming wheel 41, and is hollow-wound into a cylindrical shape (without a core rod) in the forming groove 31;

[0042] (4) The forming block 40 slides in the opposite direction, and at the same time, the cutting knife 50 slides obliquely downward, and the blade of the cutting knife 50 shears the strip 60 to form a slit bushing, which automatically falls off, and the blade of the cutting knife 50 enters the forming groove 31 after cutting; during shearing, the driving mechanism 20 can be used to retract the strip 60 to a certain length, so that the cutting position is located in the non-straight edge area;

[0043] (5) Repeat steps (2) to (4) to achieve continuous production of slit bushings.

[0044] Embodiment 2:

[0045] The difference between this embodiment and the first embodiment lies in the different installation methods of the forming wheel 41. In this embodiment, the forming wheel 41 is rotatably embedded in the forming block 40 and partially extends out of the forming block 40 to abut against the end of the strip 60. Specifically, the forming block 40 is provided with a through hole matching the forming wheel 41, and the through hole partially extends out of the forming block 40, that is, the through hole is a notched through hole on the forming block 40. After the forming wheel 41 is placed in the through hole, both ends of the through hole are blocked, so that the forming wheel 41 is embedded in the through hole and can rotate in the through hole. At the same time, the forming wheel 41 partially extends out of the forming block 40 to abut against the end of the strip 60.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low friction slotted bushing forming device, characterized in that: include: A frame (10), a driving mechanism (20), a clamping member (30), a forming block (40) and a cutting knife (50) arranged on the same side of the frame (10); The frame (10) comprises a working surface (11), and the strip passes through the driving mechanism (20) along the working surface (11) and is clamped by the clamping member (30); the clamping member (30) is provided with a molding groove (31); the molding block (40) and the cutting knife (50) are respectively slidably matched with the frame (10); the molding block (40) is provided with a molding wheel (41) when rotating; after the molding block (40) slides, the outer side of the molding wheel (41) approaches the clamping member (30) and abuts against the end of the strip, so that the strip is hollow rolled in the molding groove (31); after the cutting knife (50) slides, it cuts the rolled strip to form a slit bushing.

2. The low friction slotted bushing forming device according to claim 1, characterized in that: The forming block (40) comprises a mounting end and a forming end, the forming end being provided with a mounting groove (42), the forming wheel (41) being rotatably arranged in the mounting groove (42) via a rotating shaft (43), and the forming wheel (41) partially protrudes from the mounting groove (42) for abutting against an end of a strip.

3. The low friction slotted bushing forming device according to claim 2, characterized in that: The forming wheel (41) is rotatably embedded in the forming block (40) and partially extends out of the forming block (40) for abutting against the end of the strip.

4. The low friction slotted bushing forming device according to claim 2 or 3, characterized in that: When the forming wheel (41) abuts against the strip, the center of the forming wheel (41) and the forming groove (31) are respectively located on two sides of the working surface (11).

5. The low friction slotted bushing forming device according to claim 1, characterized in that: The clamping member (30) is rectangular and comprises a feeding end and a discharging end. The feeding end is close to the driving mechanism (20). The clamping member (30) is provided with a strip hole (32) along its extension direction, the cross section of which matches the cross section of the strip material, so that the strip material is clamped in the strip hole (32) and the strip material and the strip hole (32) are slidably matched. The forming groove (31) is located at the discharging end of the clamping member (30) and at one side of the strip hole (32).

6. The low friction slotted bushing forming device according to claim 5, characterized in that: The clamping member (30) is rotatably provided with a supporting wheel (33) at a position where the strip hole (32) and the discharge end are connected. The supporting wheel (33) and the forming groove (31) are respectively located on both sides of the strip hole (32).

7. The low friction slotted bushing forming device according to claim 6, characterized in that: The supporting wheel (33) is rotatably embedded in the clamping member (30), and the outer side of the supporting wheel (33) extends to the strip-shaped hole (32) and the discharge end.

8. The low friction slotted bushing forming device according to claim 1, characterized in that: The forming block (40) and the cutting knife (50) are arranged oppositely and obliquely on both sides of the working surface (11), and the cutting knife (50) and the forming groove (31) are located on both sides of the working surface (11); the cutting knife (50) cuts the strip after sliding and enters the forming groove (31) from the top of the forming groove (31).

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