Slotted lining forming device and slotted lining continuous preparation system and method

Abstract

The invention relates to a slotted lining forming device and a slotted lining continuous preparation system and method. The slotted lining forming device comprises a leveling feeding mechanism, a forming mechanism, a forming mechanism and a forming mechanism, wherein the leveling feeding mechanism is provided with a feeding channel; the outer edge rolling forming mechanism comprises an outer edge rolling forming die with a forming groove; the positioning mechanism comprises a male die shaft; the pre-bending mechanism comprises a pre-bending die with a pre-bending arc groove; the pre-bending die can conduct multiple times of extrusion on the strip conveyed to the male die shaft so that the head section of the strip can form a pre-bending arc section. The outer edge rolling forming die can axially move to a preset position after the male die shaft and the pre-bending die are both separated from the middle area, so that the pre-bending arc section of the strip moves along the groove wall of the forming groove, and then the head section of the strip forms a forming arc section. And the cutting and discharging mechanism comprises a cutting knife, and the cutting knife can move downwards and cut off the strip, so that the straight cylinder type slotted lining is obtained. According to the continuous forming device, continuous forming of the slotted linings can be achieved, and the production efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the field of preparing a slotted bushing, and in particular to a slotted bushing forming device, a slotted bushing continuous preparation system and a slotted bushing continuous preparation method. Background Art

[0002] Since metal coils occupy a small area and are easy to transport, thin strips are mostly produced and supplied in the form of bare metal coils. Thin strip processing manufacturers then unwind, process, and apply them according to actual needs. In the process of processing or applying aviation parts and process parts, it is necessary to apply an anti-corrosion or lubricating coating on the surface of the strip (single or double sides) to obtain a coating with uniform surface coating and good bonding strength, thereby meeting the anti-corrosion or lubrication requirements in the processing or application of parts and process parts. After coating, it is processed into a slotted bushing.

[0003] The existing coating method for this type of thin strip is to cut the metal coil after unwinding it, cut it into thin strip sections of a certain length, and then treat the surface of the thin strip section (chemical treatment, physical treatment) to prepare a thin strip with a coating layer on the surface; this technology is a method of cutting the thin strip coil and then coating it in steps, which has prominent disadvantages. The whole process involves multiple processes, and the transfer and docking between processes are cumbersome and inconvenient to transport, resulting in low processing efficiency, requiring more manpower and increasing labor costs, and even easily causing process disorder; at the same time, the method of cutting the raw material of the strip first and then coating it inevitably produces tail materials, thereby reducing the material utilization rate of the entire thin strip coil; in addition, the coating is affected by factors such as equipment conditions, operating space, and technical level. When the cut strip is coated in multiple batches, the stability between batches (coating thickness, bonding strength) is difficult to control.

[0004] At the same time, the existing slit bushings are mostly formed by cutting the strip into metal sheets that meet the length of the slit bushing, and then the metal sheets need to be manually transferred to the slit bushing forming unit for straight tube forming. This process can only process straight tube slit bushing products, and then the straight tube bushing needs to be sent to the punch press to complete the flanging process of the bushing for flanging. The degree of automated processing is not high, and the processing efficiency of the slit bushing is extremely low. Summary of the invention

[0005] The object of the present invention is to provide a slotted bushing forming device, a slotted bushing continuous preparation system and method, which can realize the continuous forming of the slotted bushing and have higher production efficiency.

[0006] The object of the present invention is achieved by a slotted bushing forming device comprising:

[0007] A leveling feeding mechanism with a feeding channel for the strip to pass through;

[0008] The outer curling forming mechanism comprises an outer curling forming die which can move axially and has a forming groove at the end, the axis of the outer curling forming die is parallel to the length direction of the feeding channel, and the notch of the forming groove is arranged toward the discharge end of the feeding channel;

[0009] The positioning mechanism includes a punch shaft located between the leveling and feeding mechanism and the outer curling and forming mechanism, the axis of the punch shaft is perpendicular to the length direction of the feeding channel, and the punch shaft can move axially to extend into or out of the middle area between the leveling and feeding mechanism and the outer curling and forming mechanism;

[0010] The pre-bending mechanism comprises a pre-bending die with a pre-bending arc groove; the pre-bending die can perform multiple extrusions on the strip transmitted to the punch shaft, so that the head section of the strip forms a pre-bending arc section; the outer rolling circle forming die can axially move to a preset position after the punch shaft and the pre-bending die are separated from the middle area, so that the pre-bending arc section of the strip moves along the groove wall of the forming groove, thereby forming a forming arc section at the head section of the strip, and the arc radius of the forming arc section is greater than the arc radius of the pre-bending arc section;

[0011] The cutting and unloading mechanism comprises a cutting knife which can move up and down. When the discharge size of the strip reaches a preset size, the cutting knife can move downward and cut the strip to obtain a straight-tube slit bushing.

[0012] In a preferred embodiment of the present invention, the pre-bending mechanism includes an upper pre-bending mold and a lower pre-bending mold which are arranged in an upper and lower manner; the lower end of the upper pre-bending mold has an upper pre-bending arc groove, the axis of the upper pre-bending mold is arranged obliquely from its upper end to the lower end toward the direction close to the leveling feeding mechanism, and the upper pre-bending mold can move along its axial direction; the upper end of the lower pre-bending mold has a lower pre-bending arc groove, the axis of the lower pre-bending mold is arranged obliquely from the lower end to the upper end toward the direction close to the leveling feeding mechanism, and the lower pre-bending mold can move along its axial direction; the upper pre-bending mold and the lower pre-bending mold can alternately extrude the strip transmitted to the punch shaft for multiple times, so that the head section of the strip forms a pre-bending arc segment, and the central angle corresponding to the pre-bending arc segment is 120~180°.

[0013] In a preferred embodiment of the present invention, the angle between the axis of the upper pre-bending mold and the horizontal plane is 40 to 60 degrees, and the angle between the axis of the lower pre-bending mold and the horizontal plane is 35 to 55 degrees.

[0014] In a preferred embodiment of the present invention, the groove wall of the forming groove includes an arc surface and an inclined surface connected up and down, the central angle corresponding to the arc surface is 110-130 degrees, and the inclined surface is tangent to the edge of the arc surface.

[0015] In a preferred embodiment of the present invention, the arc radius of the arc surface and the curling radius of the slotted bushing product satisfy the following relationship:

[0016] r=R×E

[0017] Wherein, r represents the arc radius of the arc surface, R represents the outer radius of the roll of the slit bushing product, and E represents the springback amount; when 2.5%≤δ / R<3.5%, E is 0.975~0.99; when 4%≤δ / R<6%, E is 0.96~0.975; when δ / R is greater than 6%, E is 0.945~0.96; δ represents the thickness of the strip.

[0018] In a preferred embodiment of the present invention, the slit bushing forming device also includes a rounding and finishing mechanism located between the leveling and feeding mechanism and the external curling and forming mechanism; the rounding and finishing mechanism includes an upper rounding mold and a lower rounding mold that are arranged opposite each other and can move up and down, and the upper rounding mold and the lower rounding mold can be buckled up and down and enclosed to form a rounding hole to perform roundness finishing on the straight cylindrical slit bushing.

[0019] In a preferred embodiment of the present invention, an upper arc groove is formed on the bottom surface of the upper circular calibration mold, and the cutting knife is arranged on the bottom surface of the upper circular calibration mold and close to the edge of the upper arc groove; a lower arc groove and a receiving groove are formed on the top surface of the lower circular calibration mold, and when the upper circular calibration mold and the lower circular calibration mold are buckled together, the upper arc groove and the lower arc groove can enclose to form a circular calibration hole, and the cutting knife can be accommodated in the receiving groove.

[0020] In a preferred embodiment of the present invention, two convex strips are provided on the bottom surface of the upper circular mold and on both sides of the upper arc groove, and two clamping grooves are provided on the top surface of the lower circular mold and on both sides of the lower arc groove. The portion of the convex strip away from the upper arc groove is formed with an arc chamfer, and the groove wall of the clamping groove away from the lower arc groove is formed with an arc groove wall, and the convex strip can be clamped in the corresponding clamping groove.

[0021] In a preferred embodiment of the present invention, the slit bushing forming device also includes a flanging mechanism; the flanging mechanism includes an axially movable flanging punch, the axis of the flanging punch is perpendicular to the length direction of the feeding channel, and can be coaxial with the calibration hole; the upper and lower calibration dies are respectively provided with upper and lower flanging grooves at the ends close to the flanging punch, and the upper and lower flanging grooves can form a conical hole connected to the calibration hole when the upper and lower calibration dies are buckled up and down, and the aperture of the conical hole gradually increases from the calibration hole to the flanging punch; the head of the flanging punch is a conical head, and the flanging punch can squeeze the end of the straight-cylinder slit bushing against the conical hole to form a flanging-type slit bushing.

[0022] In a preferred embodiment of the present invention, the leveling feeding mechanism includes an upper flat plate and a lower support plate arranged up and down, a conveying groove is provided on the upper surface of the lower support plate, and a feeding channel is formed between the conveying groove and the upper flat plate, and the extension direction of the bottom surface of the conveying groove can be tangent to the outer side surface of the punch shaft.

[0023] In a preferred embodiment of the present invention, a feeding wheel assembly is further provided outside the feed end of the feeding channel, and the feeding wheel assembly includes an upper feeding wheel and a lower feeding wheel which are arranged opposite to each other up and down, and are used to clamp the strip and drive the strip to move and transport; the lower surface of the strip has a coating, the upper feeding wheel is a metal wheel, and the lower feeding wheel is a plastic wheel.

[0024] In a preferred embodiment of the present invention, the slit bushing forming device further comprises an unwinding machine for unwinding the metal coil coated with the coating to form a strip, and the unwinding strip is conveyed into the feeding channel.

[0025] In a preferred embodiment of the present invention, the slit bushing forming device also includes a controller, and the controller is electrically connected to the positioning mechanism, the pre-bending mechanism, the outer curling forming mechanism and the cutting and blanking mechanism.

[0026] The present invention also provides a continuous preparation system for a slit bushing, which includes a control device, a first uncoiler, a sandblasting device, a cleaning device, a drying device, a molybdenum disulfide sprayer, a molybdenum disulfide curing machine and a winding machine which are sequentially arranged along the first strip conveying direction and electrically connected to the control device, and a second uncoiler and the above-mentioned slit bushing forming device which are sequentially arranged along the second strip conveying direction and electrically connected to the control device; the first uncoiler is used to open the metal coil to form a strip; the sandblasting device is used to sandblast the upper surface of the strip to form a sandblasting layer on the upper surface of the strip; the molybdenum disulfide sprayer is used to coat the upper surface of the strip with molybdenum disulfide coating to form a molybdenum disulfide coating on the sandblasting layer; the molybdenum disulfide curing machine is used to cure the molybdenum disulfide coating; the second uncoiler is used to open the metal coil after coating to form a strip with a coating, and the feeding channel is used for allowing the coated strip to pass through.

[0027] In a preferred embodiment of the present invention, the system for continuously preparing the slit bushing further comprises a transfer device for transferring the metal coil with the coating formed after the winding of the winding machine to the second uncoiler.

[0028] In a preferred embodiment of the present invention, the molybdenum disulfide coating is composed of 25-30% molybdenum disulfide, 35-55% phenolic resin, 5-10% lubricant and the remainder of organic solvent, calculated by weight percentage; the lubricant is composed of polytetrafluoroethylene, lead powder and graphite powder, and the weight ratio is (2-4):(2-4):1; the organic solvent is ethylene glycol ethyl ether acetate.

[0029] In a preferred embodiment of the present invention, the spraying distance of the molybdenum disulfide sprayer is 150-200 mm, the spraying pump speed is 3.0-8.0 g / min, the temperature of the spraying chamber is 40-60°C; the curing temperature of the molybdenum disulfide curing machine is 180-200°C.

[0030] In a preferred embodiment of the present invention, a straightening wheel assembly is further provided between the first uncoiler and the sandblasting device, the straightening wheel assembly comprising a plurality of upper straightening wheels arranged at intervals and a plurality of lower straightening wheels arranged at intervals, the plurality of upper straightening wheels and the plurality of lower straightening wheels being staggered along the first strip conveying direction.

[0031] In a preferred embodiment of the present invention, a roughness detector is provided between the sandblasting device and the cleaning device and near the sandblasting outlet thereof, for detecting the surface roughness of the strip; the control device is electrically connected to the roughness detector, and can control the prompter to emit a prompt sound when the roughness detected by the roughness detector is less than a preset value, and can also adjust the pressure, speed and sandblasting amount of the sandblasting gun of the sandblasting device according to the data detected by the roughness detector.

[0032] In a preferred embodiment of the present invention, a water-absorbing cotton strip is provided at the cleaning outlet of the cleaning device; and a sponge block is also provided between the molybdenum disulfide sprayer and the molybdenum disulfide curing machine for wiping the lower surface of the strip.

[0033] In a preferred embodiment of the present invention, the drying temperature of the drying device is 120-150°C, and the speed of the strip movement is 10-20m / s; a humidity detector is provided in the drying device, the control device is electrically connected to the humidity detector, and can adjust the temperature in the drying device according to the data detected by the humidity detector.

[0034] In a preferred embodiment of the present invention, the molybdenum disulfide sprayer is also connected to a molybdenum disulfide feed box, which is equipped with an agitator; a thickness detector is also provided in the molybdenum disulfide sprayer for detecting the thickness of the molybdenum disulfide coating; a thermometer is also provided between the molybdenum disulfide sprayer and the molybdenum disulfide curing machine for detecting the temperature of the molybdenum disulfide coating; the control device is electrically connected to the agitator, the thickness detector and the thermometer, and can adjust the coating time of the molybdenum disulfide sprayer according to the data detected by the thickness detector, and can also control the curing temperature of the molybdenum disulfide curing machine according to the data detected by the thermometer.

[0035] The present invention also provides a method for continuously preparing a slotted bushing, comprising:

[0036] Leveling conveying: convey the strip forward through the feeding channel, the head section of the strip can overlap a punch shaft and continue to convey;

[0037] Pre-bending: The pre-bending die is moved toward the direction close to the punch axis, and the strip passing through the punch axis is extruded multiple times. The pre-bending arc groove of the pre-bending die is used to press the head section of the strip against the punch axis multiple times, so that the head section of the strip forms a pre-bent arc section;

[0038] External rolling forming: Move the external rolling forming die to a preset position in the direction close to the feeding channel. During the continuous conveying of the strip, the pre-bent arc segment moves along the groove wall of the forming groove, so that the head section of the strip forms a forming arc segment, and the arc radius of the forming arc segment is larger than the arc radius of the pre-bent arc segment.

[0039] Cutting: When the output size of the strip reaches the preset size, the cutting knife moves downward and cuts the strip to obtain a straight-tube slit bushing.

[0040] In a preferred embodiment of the present invention, after the cutting step, the method further comprises:

[0041] Flanging: Move the flanging punch with a conical head to press the end of the straight-tube unsealed bushing against a conical hole to achieve flanging, thereby obtaining a flanging-type slit bushing.

[0042] In a preferred embodiment of the present invention, before the leveling and conveying step, the method further includes:

[0043] Uncoiling after coating: The metal coil after coating is uncoiled by a second uncoiling machine to form a strip with a coating on the lower surface.

[0044] In a preferred embodiment of the present invention, before the rolling step, the method further comprises:

[0045] Uncoiling before coating: The metal coil is unwound by the first uncoiling machine to form a strip;

[0046] Sandblasting: conveying the strip into the sandblasting device, sandblasting the upper surface of the strip to form a sandblasting layer on the upper surface of the strip;

[0047] Cleaning: The strip after sandblasting is conveyed into the cleaning device to clean the strip;

[0048] Drying: The cleaned strip is conveyed into the drying device to dry the strip;

[0049] Spraying: conveying the dried strip into a molybdenum disulfide spraying machine, coating the upper surface of the strip with molybdenum disulfide paint to form a molybdenum disulfide coating on the sandblasting layer;

[0050] Curing: The sprayed strip is conveyed into the molybdenum disulfide curing machine to cure the molybdenum disulfide coating;

[0051] Coiling: The solidified strip is conveyed into the coiler for coiling to obtain a metal coil with a molybdenum disulfide coating.

[0052] As described above, the slit bushing forming device and the slit bushing continuous preparation system of the present invention, compared with the existing slit bushing forming which requires the strip to be cut into metal sheets that meet the length of the slit bushing and then manually transferred to the slit bushing forming unit for straight tube forming, do not need to cut the strip into single metal sheets in advance. By utilizing the cooperation of the leveling feeding mechanism, the positioning mechanism, the pre-bending mechanism, the external rolling forming mechanism and the cutting and unloading mechanism, the continuously conveyed strip can be pre-bent into a small arc and then formed into a large arc. After the discharge size of the strip meets the length of the slit bushing, the strip can be cut to obtain a straight tube slit bushing, thereby realizing the continuous production of slit bushing rolling, and the processing efficiency is higher.

[0053] The continuous preparation method of the slit bushing of the present invention pre-bends the continuously conveyed strip into a small arc, then shapes it into a large arc, and cuts the strip after the discharge size of the strip meets the elongation of the slit bushing, so that a straight-cylinder slit bushing can be obtained, thereby realizing the continuous production of the slit bushing rolling, and the processing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0055] in:

[0056] Figure 1 This is a schematic structural diagram of the slotted bushing forming device provided by the present invention.

[0057] Figure 2 A schematic structural diagram of the slotted bushing forming device provided by the present invention when pre-bending a strip to form a pre-bent arc segment.

[0058] Figure 3 A schematic structural diagram of the slit bushing forming device provided by the present invention after the strip is subjected to outward rolling forming to form a formed arc segment.

[0059] Figure 4 The structure diagram of the slotted bushing forming device provided by the present invention when flanging the strip Figure 1 .

[0060] Figure 5 for Figure 4 Side view of.

[0061] Figure 6 The diagram of the obtained flanged slit bushing Figure 1 .

[0062] Figure 7 The diagram of the obtained flanged slit bushing Figure 2 .

[0063] Figure 8A schematic diagram of the structure of coating-related equipment in the continuous preparation system for slotted bushings provided by the present invention.

[0064] Description of Figure Numbers:

[0065] 100. Slit bushing forming device;

[0066] 1. Leveling feeding mechanism; 10. Feeding channel; 11. Upper plate; 12. Lower support plate;

[0067] 2. Outer rolling forming mold; 21. Forming groove; 211. Arc surface; 212. Inclined surface;

[0068] 31. Upper pre-bending mold; 32. Lower pre-bending mold;

[0069] 4. Cutting knife;

[0070] 51, upper round mold; 511, upper arc groove; 512, convex strip; 52, lower round mold; 521, lower arc groove; 522, slot;

[0071] 6. Flanging punch; 61. Conical head;

[0072] 7. Forming arc segment;

[0073] 8. Flanged slit bushing;

[0074] 200, first unwinding machine;

[0075] 300, straightening wheel assembly; 301, upper straightening wheel; 302, lower straightening wheel;

[0076] 400. Sandblasting device;

[0077] 500. Cleaning device;

[0078] 600. Drying device;

[0079] 700. Molybdenum disulfide spraying machine; 701. Molybdenum disulfide feed box;

[0080] 800, Molybdenum disulfide curing machine;

[0081] 900. Winding machine. DETAILED DESCRIPTION

[0082] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0083] like Figures 1 to 7 As shown, the present application provides a slotted bushing forming device 100, comprising:

[0084] A leveling feeding mechanism 1 having a feeding channel 10 for the strip to pass through;

[0085] The outer curling forming mechanism comprises an outer curling forming mold 2 which can move axially and has a forming groove 21 at the end, the axis of the outer curling forming mold 2 is parallel to the length direction of the feeding channel 10, and the notch of the forming groove 21 is arranged toward the discharge end of the feeding channel 10;

[0086] The positioning mechanism includes a punch shaft located between the leveling and feeding mechanism 1 and the outer curling and forming mechanism, the axis of the punch shaft is perpendicular to the length direction of the feeding channel 10, and the punch shaft can move axially to extend into or out of the middle area between the leveling and feeding mechanism 1 and the outer curling and forming mechanism;

[0087] The pre-bending mechanism comprises a pre-bending die having a pre-bending arc groove; the pre-bending die can perform multiple extrusions on the strip transmitted to the punch shaft, so that the head section of the strip forms a pre-bending arc section; the outer rolling circle forming die 2 can axially move to a preset position after the punch shaft and the pre-bending die are separated from the middle area, so that the pre-bending arc section of the strip moves along the groove wall of the forming groove 21, and then the head section of the strip forms a forming arc section 7, and the arc radius of the forming arc section 7 is greater than the arc radius of the pre-bending arc section;

[0088] The cutting and blanking mechanism comprises a cutting knife 4 which can move up and down. The cutting knife 4 can move downward and cut the strip material when the discharge size of the strip material reaches a preset size, so as to obtain a straight-tube slit bushing.

[0089] When in use, after the strip passes through the feeding channel 10, the end of the strip can be overlapped on the punch shaft and continue to be conveyed; the pre-bending die of the pre-bending mechanism moves toward the direction close to the punch shaft, and extrude the strip passing through the punch shaft for multiple times, and uses the pre-bending arc groove of the pre-bending die to press the head section of the strip against the punch shaft for multiple times, so that the head section of the strip forms a pre-bent arc section, that is, a small arc; then the punch shaft and the pre-bending die move outward and leave the middle area, and the outer rolling forming die 2 moves toward the feeding channel 10, and then the outer rolling forming die 2 moves toward the feeding channel 10 ... The strip moves in the direction of the material channel 10 to the preset position. During the continuous transmission of the strip, the pre-bent arc segment will move along the groove wall of the forming groove 21. Since the pre-bent arc segment has been pre-bent to form a small arc, it will become a large arc when it continues to move under the action of the forming groove 21, that is, forming a forming arc segment 7; when the discharge size of the strip reaches the preset size, that is, when the length of the slit bushing is met, the strip stops moving, and the cutting knife 4 moves downward and cuts the strip to obtain a straight-cylindrical slit bushing.

[0090] Therefore, compared with the existing slit bushing forming method which requires the strip to be cut into metal sheets that meet the length of the slit bushing and then manually transferred to the slit bushing forming unit for straight tube forming, the slit bushing forming device 100 of the present application does not need to cut the strip into single metal sheets in advance. By utilizing the cooperation of the leveling feeding mechanism 1, the positioning mechanism, the pre-bending mechanism, the external rolling forming mechanism and the cutting and unloading mechanism, the continuously conveyed strip can be pre-bent into a small arc and then formed into a large arc. After the discharge size of the strip meets the length of the slit bushing, the strip can be cut to obtain a straight tube slit bushing, thereby realizing the continuous production of slit bushing rolling, and the processing efficiency is higher.

[0091] In a specific implementation, the leveling feeding mechanism 1 includes an upper flat plate 11 and a lower support plate 12 arranged up and down, and a conveying groove is provided on the upper surface of the lower support plate 12. The conveying groove and the upper flat plate 11 form a feeding channel 10, and the extension direction of the bottom surface of the conveying groove can be tangent to the outer side surface of the punch shaft.

[0092] The upper plate 11 is buckled and pressed against the lower support plate 12. The lower surface of the upper plate 11 and the conveying groove of the lower support plate 12 enclose a feeding channel 10 with two ends open. The conveying groove is a rectangular groove. The specific size can be determined according to the width and thickness of the strip. Generally, the groove width of the conveying groove is greater than the width of the strip by 0.02-0.05mm, and the groove depth of the conveying groove is greater than 1 / 2 of the thickness of the strip by 0.01-0.03mm. The feeding channel 10 in the leveling feeding mechanism 1 also plays a certain leveling role on the strip.

[0093] The above-mentioned punch shaft is a punch, and the arc groove of the pre-bending mold is a concave mold, and the two cooperate with each other. Initially, the punch shaft extends into the middle area. After the strip is transferred to the punch shaft, the pre-bending mechanism pre-bends the strip. Then the punch shaft and the pre-bending mechanism leave the middle area, and the outer rolling forming mold 2 moves again to avoid mutual interference. It can be understood that the axis of the punch shaft should be lower than the feeding channel 10, and the extension direction of the channel bottom wall of the feeding channel 10 should be tangent to the outer peripheral side wall of the punch shaft. The strip can be conveyed and overlapped on the punch shaft and continue to be conveyed. The size of the punch shaft and the distance from its center to the discharge end of the feeding channel 10 are determined according to the product extension and actual conditions.

[0094] Further, see Figure 2The pre-bending mechanism includes an upper pre-bending mold 31 and a lower pre-bending mold 32 which are arranged in an upper and lower manner; the lower end of the upper pre-bending mold 31 has an upper pre-bending arc groove, and the axis of the upper pre-bending mold 31 is arranged obliquely from its upper end to the lower end toward the direction close to the leveling feeding mechanism 1, and the upper pre-bending mold 31 can move along its axial direction; the upper end of the lower pre-bending mold 32 has a lower pre-bending arc groove, and the axis of the lower pre-bending mold 32 is arranged obliquely from the lower end to the upper end toward the direction close to the leveling feeding mechanism 1, and the lower pre-bending mold 32 can move along its axial direction; the upper pre-bending mold 31 and the lower pre-bending mold 32 can alternately extrude the strip transmitted to the punch shaft for multiple times, so that the head section of the strip forms a pre-bending arc section.

[0095] The entire pre-bending mechanism includes two pre-bending molds, namely, an upper pre-bending mold 31 and a lower pre-bending mold 32. The diameter of the arc grooves at the ends of the two pre-bending molds should match the diameter of the punch shaft, and the ends of the pre-bending molds can press the passing strip against the outer peripheral wall of the punch shaft. When in use, the upper pre-bending mold 31 and the lower pre-bending mold 32 can alternately extrude the strip multiple times to form a pre-bending arc segment. The central angle corresponding to the pre-bending arc segment should be 120 to 180 degrees, so that the pre-bending degree can meet the requirements of forming a large arc under the action of the subsequent forming groove 21.

[0096] In this embodiment, the angle between the axis of the upper pre-bending mold 31 and the horizontal plane is preferably greater than the angle between the axis of the lower pre-bending mold 32 and the horizontal plane, and the pre-bending effect is better. Further preferably, the angle between the axis of the upper pre-bending mold 31 and the horizontal plane is 40-60°, and the angle between the axis of the lower pre-bending mold 32 and the horizontal plane is 35-55°. Further preferably, the angle between the axis of the upper pre-bending mold 31 and the horizontal plane is 50°, and the angle between the axis of the lower pre-bending mold 32 and the horizontal plane is 45°.

[0097] Further, see Figure 2 and Figure 3 In order to facilitate the formation of a large arc from a small arc under the action of the forming groove 21, the groove wall of the forming groove 21 includes an arc surface 211 and an inclined surface 212 connected up and down. The central angle of the arc surface 211 is 110-130°, and the inclined surface 212 is tangent to the edge of the arc surface 211.

[0098] The center of the circle corresponding to the arc surface 211 should be lower than the axis of the punch shaft. The top of the arc surface 211 is offset relative to the center of the circle corresponding to the arc surface 211 in the length direction of the feeding channel 10, and is offset in the direction away from the feeding channel 10. The specific offset distance depends on actual conditions.

[0099] The radius corresponding to the arc surface 211 in the specific forming groove 21 can be determined by setting different springback amounts E according to the different outer radius R of the product and the thickness δ of the strip, as follows:

[0100] The arc radius of the arc surface 211 and the curling radius of the slotted bushing product satisfy the following relationship:

[0101] r=R×E

[0102] Wherein, r represents the arc radius of the arc surface 211, R represents the outer radius of the curling of the slit bushing product, and E represents the springback amount; when 2.5%≤δ / R<3.5%, E is 0.975~0.99; when 4%≤δ / R<6%, E is 0.96~0.975; when δ / R is greater than 6%, E is 0.945~0.96; δ represents the thickness of the strip.

[0103] It should be noted that, since the groove wall shape of the forming groove 21 is obtained by tangency of the arc surface 211 + the inclined surface 212 , adjustments can be made according to the forming quality of the slit bushing during specific operations.

[0104] Furthermore, the slit bushing forming device 100 also includes a rounding and finishing mechanism located between the leveling and feeding mechanism 1 and the external curling and forming mechanism; the rounding and finishing mechanism includes an upper rounding mold 51 and a lower rounding mold 52 which are arranged opposite to each other and can move up and down, and the upper rounding mold 51 and the lower rounding mold 52 can be buckled up and down to enclose a rounding hole to perform rounding finishing on the straight cylindrical slit bushing.

[0105] Specifically, the outer curling forming die 2 can move axially to extend into or out of the area between the upper calibration die 51 and the lower calibration die 52. An upper arc groove 511 is formed on the bottom surface of the upper calibration die 51, and the cutting knife 4 is arranged on the bottom surface of the upper calibration die 51 and close to the edge of the upper arc groove 511; a lower arc groove 521 and a receiving groove are formed on the top surface of the lower calibration die 52. When the upper calibration die 51 and the lower calibration die 52 are buckled up and down, the upper arc groove 511 and the lower arc groove 521 can enclose to form a calibration hole, and the cutting knife 4 can be accommodated in the receiving groove.

[0106] The cutting knife 4 is integrated on the upper rounding die 51, which is more convenient to process and install. The axial direction of the rounding hole is perpendicular to the length direction of the feeding channel 10. The cutting knife 4 is a plate-like structure, and its plate surface is perpendicular to the bottom surface of the upper rounding die 51 and parallel to the axis of the rounding hole. The cutting knife 4 can be close to the edge of the upper arc groove 511, and a certain interval is left between the two. The specific interval depends on the overlap size required by the product, and the interval is generally 0.25-0.35mm; the accommodating groove is a long strip groove, and its length direction is parallel to the axis of the rounding hole.

[0107] When the discharge size of the strip meets the elongation of the slit bushing, the strip stops moving, the outer curling forming mold 2 moves outward and leaves the area between the upper rounding mold 51 and the lower rounding mold 52, the upper rounding mold 51 and the lower rounding mold 52 move toward each other, and the cutting knife 4 moves downward with the upper rounding mold 51, cuts the strip and continues to move downward until the upper rounding mold 51 and the lower rounding mold 52 are buckled together, the cutting knife 4 is inserted in the accommodating groove, and the formed straight cylindrical slit bushing is located in the rounding hole, and the roundness of the straight cylindrical slit bushing can be fine-tuned.

[0108] It can be understood that since the cutting knife 4 is at a certain distance from the edge of the upper arc groove 511, the straight-cylindrical slit bushing obtained after cutting has an overlapping portion at the fracture position, and the overlapping portion corresponds to the distance between the cutting knife 4 and the edge of the upper arc groove 511. The overlapping portion will only be stretched open to form a slit during the later use of the product.

[0109] In another optional embodiment, the cutting knife 4 may also be provided independently and not integrated on the upper round mold 51 .

[0110] Furthermore, two convex strips 512 are provided on the bottom surface of the upper circular mold 51 and on both sides of the upper arc groove 511 , and two clamping grooves 522 are provided on the top surface of the lower circular mold 52 and on both sides of the lower arc groove 521 . The convex strips 512 can be clamped in the corresponding clamping grooves 522 .

[0111] The convex strip 512 and the clamping groove 522 are both long strip structures, and the length direction is parallel to the axial direction of the roundness correction hole. The entire roundness correction and finishing mechanism is an upper and lower opening and closing structure. The cooperation of the two convex strips 512 and the two clamping grooves 522 can better align the upper roundness correction mold 51 and the lower roundness correction mold 52, so that the center of the formed roundness correction hole is aligned with the center of the straight-cylinder slotted bushing, thereby improving the roundness correction effect.

[0112] Furthermore, the portion of the convex strip 512 away from the upper arc groove 511 is formed with an arc chamfer, and the groove wall of the clamping groove 522 away from the lower arc groove 521 is formed with an arc groove wall. The provision of the arc chamfer and the arc groove wall can make it easier for the convex strip to enter the clamping groove 522, playing a certain guiding role.

[0113] In some embodiments, after roundness finishing using a roundness finishing mechanism, a straight-tube slotted bushing product can be obtained.

[0114] In other embodiments, the slotted bushing forming device 100 further includes a flanging mechanism. After the roundness is fine-tuned by the rounding and finishing mechanism, the straight-cylindrical slotted bushing needs to be flanging-processed by the flanging mechanism to obtain a flanging-type slotted bushing 8.

[0115] Specifically, the flanging mechanism includes an axially movable flanging punch 6, the axis of which is perpendicular to the length direction of the feeding channel 10 and can be coaxial with the rounding hole; the ends of the upper rounding die 51 and the lower rounding die 52 near the flanging punch 6 are respectively formed with an upper flanging groove and a lower flanging groove, which can form a tapered hole connected to the rounding hole when the upper rounding die 51 and the lower rounding die 52 are buckled up and down, and the aperture of the tapered hole gradually increases from the rounding hole to the flanging punch 6; the head of the flanging punch 6 is a tapered head 61, and the flanging punch 6 can press the end of the straight-tube slotted bushing against the tapered hole to form a flanging type slotted bushing 8. In addition, the rounding + flanging of the slotted bushing can be integrated, and the product has high dimensional accuracy and good consistency.

[0116] The conical hole and the gear of the flanging punch 6 should match the flanging size required by the product, and together with the flanging punch 6, the flanging action of the straight-tube slotted bushing is realized.

[0117] Furthermore, in order to facilitate the strip to be smoothly conveyed forward through the feeding channel 10, a feeding wheel assembly is provided outside the feeding end of the feeding channel 10, and the feeding wheel assembly includes an upper feeding wheel and a lower feeding wheel arranged opposite to each other, which are used to clamp the strip and drive the strip to move and convey. The strip is smoothly conveyed by utilizing the force of the upper feeding wheel and the lower feeding wheel.

[0118] Generally, the inner wall of the slotted bushing needs to be coated to meet the performance requirements. Therefore, the coating needs to be applied on one side of the strip. In this embodiment, the lower surface of the strip has a coating, the upper feed wheel is a metal wheel, and the lower feed wheel is a plastic wheel (such as a polyester amine wheel) to avoid damaging the coating.

[0119] Furthermore, the slit bushing forming device 100 also includes a decoiler (ie, the second decoiler described below) for uncoiling the coated metal coil to form a strip, and the uncoiled strip is conveyed into the feeding channel 10 .

[0120] Furthermore, the slit bushing forming device 100 also includes a controller, which is electrically connected to the positioning mechanism, pre-bending mechanism, external curling forming mechanism and cutting and blanking mechanism to respectively control the movement of the punch shaft, pre-bending mold, external curling forming mold 2 and cutting knife 4.

[0121] Of course, for the embodiment in which the cutting knife 4 is integrated on the upper circular mold 51 , the controller does not need to separately control the movement of the cutting knife 4 , and can directly control the movement of the upper circular mold 51 .

[0122] The controller is also electrically connected to the above-mentioned rounding and finishing mechanism, flanging mechanism, uncoiler (i.e., the second uncoiler described below), and feed wheel assembly to respectively control the movement of the upper rounding die 51 and the lower rounding die 52, the movement of the flanging punch 6, the action of the uncoiler, and the action of the feed wheel in the feed wheel assembly.

[0123] The controller is used to control each component, which has a higher degree of automation and higher precision, and can improve the processing efficiency and molding quality of the slit bushing molding.

[0124] Further, see Figures 1 to 8 The present application also provides a system for continuously preparing an unsealed bushing, comprising a control device, a first unwinder 200, a sandblasting device 400, a cleaning device 500, a drying device 600, a molybdenum disulfide spraying machine 700, a molybdenum disulfide curing machine 800 and a winding machine 900 sequentially arranged along a first strip conveying direction and electrically connected to the control device, and a second unwinder sequentially arranged along a second strip conveying direction and electrically connected to the control device and the above-mentioned slit bushing forming device 100; the first unwinder 2 00 is used to open the metal coil to form a strip; the sandblasting device 400 is used to sandblast the upper surface of the strip to form a sandblasting layer on the upper surface of the strip; the molybdenum disulfide spraying machine 700 is used to coat the upper surface of the strip with molybdenum disulfide coating to form a molybdenum disulfide coating on the sandblasting layer; the molybdenum disulfide curing machine 800 is used to cure the molybdenum disulfide coating; the second uncoiler is used to open the metal coil after coating to form a strip with a coating, and the feeding channel 10 is used for allowing the coated strip to pass through.

[0125] Among them, the first strip conveying direction and the second strip conveying direction can be the same direction or different directions, depending on the actual situation. For example, in this embodiment, the first strip conveying direction is a horizontal straight line direction, and the second strip conveying direction is also a horizontal straight line direction. These two horizontal straight line directions can be the same or different. The first uncoiler 200, the sandblasting device 400, the cleaning device 500, the drying device 600, the molybdenum disulfide sprayer 700, the molybdenum disulfide curing machine 800 and the winder 900 are arranged in sequence along the first horizontal straight line direction, and the second uncoiler and the slit bushing forming device 100 are arranged in sequence along the second horizontal straight line direction. The aforementioned feeding wheel assembly is located between the second uncoiler and the slit bushing forming device 100.

[0126] During operation, the uncoated metal coil (i.e., metal thin strip coil) is opened by the first uncoiler 200 to form a continuously conveyed strip (plate), and the strip is successively blasted, cleaned, dried, coated and cured by the sandblasting device 400, the cleaning device 500, the drying device 600, the molybdenum disulfide spraying machine 700 and the molybdenum disulfide curing machine 800, and then wound by the winder 900 to obtain a coated metal coil; after the coated metal coil is unwound by the second uncoiler, the coated strip enters the slotted bushing forming device 100 in a manner that the coating is located on the lower surface of the strip to form the slotted bushing. The aforementioned controller and the control device can be the same control mechanism, or the controller can also be integrated in the control device. The control device is used to control the actions of each device.

[0127] Therefore, the continuous preparation system of the slit bushing of the present application effectively integrates the first uncoiler 200, the sandblasting device 400, the cleaning device 500, the drying device 600, the molybdenum disulfide sprayer 700, the molybdenum disulfide curing machine 800, and the winder 900, and effectively integrates the second uncoiler and the slit bushing forming device 100, and can achieve efficient and orderly automatic surface coating + slit bushing rolling of the entire coil without affecting the thin strip coil; unwinding, coating, and winding are all automatically controlled, and re-unwinding and slit bushing rolling are automatically controlled, and these two working processes do not require intermediate cutting and manual transportation. The technology of continuous surface coating of thin strip coil + continuous processing of slit bushing rolling has been realized, which greatly saves manpower and transportation costs; the surface treatment and slit bushing forming treatments are all controlled online, which improves efficiency while achieving uniform control of the entire coil treatment effect, coating thickness and rolling effect; thereby obtaining a surface coating layer with consistent bonding strength and high thickness uniformity, and then completing the continuous automated production of the slit bushing rolling in the slit bushing forming device 100, and finally obtaining a slit bushing product whose outer dimensions and the drawing force generated by the drawing mandrel through the extrusion of the slit bushing to strengthen the substrate hole meet the requirements.

[0128] The entire continuous preparation system is particularly suitable for occasions in the aerospace field where high requirements are placed on the adhesion of the coating on the slotted bushing. The use of molybdenum disulfide coating has better adhesion. At the same time, sandblasting before spraying can enhance the roughness of the strip surface, which is more conducive to improving the adhesion when spraying the molybdenum disulfide coating. Curing the molybdenum disulfide coating after spraying can further enhance the adhesion of the coating. The combination of sandblasting, molybdenum disulfide spraying and curing can significantly improve the adhesion of the coating, which is more conducive to achieving better process effects when subsequent slotted bushing products are used.

[0129] Furthermore, the system for continuously preparing the slit bushing also includes a transfer device for transferring the metal coil with the coating formed after winding by the winding machine 900 to the second unwinding machine.

[0130] The transfer device may include a forklift, and when in use, the forklift is controlled by a robot or an operator to transfer the coated metal coil between the coiler 900 and the second uncoiler. The transfer device may also include a transfer vehicle and a robot, and the robot cooperates with the transfer vehicle to transfer the metal coil.

[0131] It can be understood that when an operator is required to operate a forklift to transfer metal coils, the entire system only requires human participation during the transfer process, and no human participation is required during the coating process and the bushing forming process, and the degree of automation is high. When the metal coils are transferred by robot operation, the entire system, including coating, transferring metal coils and forming bushings, does not require human participation, and the degree of automation is higher.

[0132] Preferably, the molybdenum disulfide coating consists of 25-30% molybdenum disulfide, 35-55% phenolic resin, 5-10% lubricant and the balance organic solvent, in terms of weight percentage.

[0133] The lubricant is preferably composed of polytetrafluoroethylene, lead powder and graphite powder, and the weight ratio is (2-4): (2-4): 1, and the weight ratio is more preferably 2: 2: 1. The organic solvent is preferably ethylene glycol ethyl ether acetate.

[0134] The use of molybdenum disulfide coating with this composition and proportion can make the formed molybdenum disulfide coating have better adhesion and be less likely to fall off, which is more conducive to achieving better process effects when subsequent slotted bushing products are used, and helps to smoothly pull out the core rod of the slotted bushing during installation, thereby improving the fatigue life of the structural hole.

[0135] Further preferably, the spraying distance of the molybdenum disulfide sprayer 700 is 150-200 mm, the spraying pump speed is 3.0-8.0 g / min, the temperature of the spraying chamber is 40-60° C., and the curing temperature of the molybdenum disulfide curing machine 800 is 180-200° C. The spraying parameters and curing parameters match the molybdenum disulfide coating, which is more conducive to significantly improving the adhesion of the molybdenum disulfide coating.

[0136] The molybdenum disulfide coating and spraying process used in this embodiment are designed according to the use characteristics of the slotted bushing. Only when the molybdenum disulfide coating composition and the spraying parameters are organically combined can the best effect be achieved and the adhesion of the coating be optimal.

[0137] Furthermore, a straightening wheel assembly 300 is provided between the first uncoiler 200 and the sandblasting device 400. The straightening wheel assembly 300 includes a plurality of upper straightening wheels 301 arranged at intervals and a plurality of lower straightening wheels 302 arranged at intervals. The plurality of upper straightening wheels 301 and the plurality of lower straightening wheels 302 are staggered along the conveying direction of the strip to straighten the strip.

[0138] Furthermore, a roughness detector is provided between the sandblasting device 400 and the cleaning device 500 and near the sandblasting outlet thereof, for detecting the surface roughness of the strip; the control device is electrically connected to the roughness detector, and can control a prompt device (such as an alarm) to emit a prompt sound when the roughness detected by the roughness detector is less than a preset value, and can also adjust the pressure, speed and sandblasting amount of the sandblasting gun of the sandblasting device 400 according to the data detected by the roughness detector.

[0139] The entire sandblasting device 400 includes a sandblasting box and a power device. The sandblasting box is provided with a sandblasting inlet and a sandblasting outlet arranged opposite to each other for the strip to enter and exit. A plurality of sandblasting guns are provided at the top of the sandblasting box to sandblast the upper surface of the strip. Since the metal thin strip coil for forming the slotted bushing in this embodiment only needs to have a coating on one side and the other side needs to be smooth, it is only necessary to sandblast the upper surface of the strip. The power device includes a servo motor and a pump. The servo motor is connected to the pump to drive the pump to operate. The pump is connected to each sandblasting gun through a corresponding pipeline to mix the high-pressure airflow with the abrasive and then spray it out through the sandblasting gun. A frequency converter is connected to the servo motor, and the control device is connected to the frequency converter. The surface roughness of the strip after sandblasting is automatically detected under the action of the roughness detector. Then the control device can control the output shaft speed of the servo motor by controlling the frequency converter, and automatically adjust the pressure, speed and sandblasting amount of the sandblasting gun, so as to obtain the surface roughness required for spraying, so as to be more conducive to improving the adhesion of the subsequent molybdenum disulfide coating.

[0140] During actual processing, after the strip is sandblasted at the beginning, if the roughness detector detects that the surface roughness of the strip does not meet the standard, the control device will control the alarm to sound, and the part of the strip that does not meet the initial roughness standard can be directly cut off; the control device adjusts the relevant parameters of the sandblasting gun according to the detected roughness to ensure that the roughness obtained by subsequent sandblasting meets the requirements.

[0141] The cleaning device 500 comprises a cleaning box, on which a cleaning inlet and a cleaning outlet are arranged opposite to each other for the strip to enter and exit. A plurality of flushing nozzles are arranged in the cleaning box, which can effectively remove the oxide scale on the surface of the strip and flush the impurities on the surface of the strip.

[0142] A water-absorbing cotton strip is preferably provided at the cleaning outlet of the cleaning device 500 to absorb the liquid on the surface of the strip after flushing.

[0143] The cleaned strip enters the drying device 600, and the drying parameters are as follows: the drying temperature is 120-150°C, and the strip moving speed is 10-20mm / s. The drying device 600 includes a drying box, and a drying inlet and a drying outlet are arranged opposite to each other on the drying box for the strip to enter and exit. The drying device 600 can be heated and dried by an induction coil, or other drying methods can be used. A humidity detector is provided in the drying device 600 to detect the humidity in the drying device 600 to reflect the water vapor concentration in the drying box. The control device is electrically connected to the humidity detector, and can adjust the temperature in the drying device 600 according to the data detected by the humidity detector, increase or decrease the temperature, and avoid the strip being insufficiently dry to affect the coating effect of molybdenum disulfide in the subsequent process.

[0144] The dried strip enters the molybdenum disulfide spraying machine 700, which includes a spraying box and a power device. The spraying box is provided with a spraying inlet and a spraying outlet arranged opposite to each other for the strip to enter and exit. A plurality of coating spray guns are provided at the top of the spraying box to coat the upper surface of the strip. Since the metal thin strip coil for forming the slit bushing in this embodiment only needs to have a coating on one side, only the upper surface of the strip needs to be coated. Of course, in another optional embodiment, a plurality of coating spray guns can be provided at the top and the bottom of the spraying box. When applied to the metal thin strip coil for forming the slit bushing, only the coating spray gun at the top can be used for coating; when applied to other occasions requiring double-sided coating, the coating spray guns at the top and the bottom can be started at the same time to meet the requirements of single-sided or double-sided coating at the same time.

[0145] The power device includes an air compressor and a pumping device. The pumping device is connected to the air compressor and each coating spray gun through corresponding pipelines. When in use, turn on the air compressor to prepare compressed air, use acetone to clean the equipment spray pipeline, check the spray gun status, the spray gun should be unobstructed and the spray atomization should be normal; then use the pumping device to mix the compressed air with molybdenum disulfide and spray it through the coating spray gun. The temperature in the molybdenum disulfide spraying device is controllable and adjustable, and can be adjusted using a control device.

[0146] The molybdenum disulfide spraying machine 700 is also connected to a molybdenum disulfide feed box 701, in which a stirrer is provided, and the control device is electrically connected to the stirrer. By providing the stirrer, precipitation of the solution can be avoided while waiting for use, and the concentration of molybdenum disulfide can be controlled to ensure the consistency of the appearance of the molybdenum disulfide coating sprayed on the strip. Stirring parameters: the rotation speed is 50 to 100 r / min.

[0147] A thickness detector is also provided in the molybdenum disulfide spraying machine 700 for detecting the thickness of the molybdenum disulfide coating. The control device is electrically connected to the thickness detector and can adjust the coating time of the molybdenum disulfide spraying machine 700 according to the data detected by the thickness detector.

[0148] A thermometer is also provided between the molybdenum disulfide sprayer 700 and the molybdenum disulfide curing machine 800 for detecting the temperature of the molybdenum disulfide coating; the control device is electrically connected to the thermometer and can control the curing temperature of the molybdenum disulfide curing machine 800 according to the data detected by the thermometer to effectively ensure that the curing temperature of the coating is within 180-200°C.

[0149] Furthermore, a sponge block is provided between the molybdenum disulfide spraying machine 700 and the molybdenum disulfide curing machine 800 for wiping the lower surface of the strip. The sponge block can be fixed by a corresponding bracket to wipe the lower surface of the strip when the strip passes through, thereby ensuring the cleanliness of the lower surface of the strip.

[0150] The continuous preparation system of the unsealed bushing in this embodiment is a continuous production line from metal coil surface lubrication treatment to automatic rolling and flanging of the slit bushing, realizing continuous processing from metal strip surface coating to slit bushing rolling + flanging. The slit bushing products are continuously prepared by combining the continuous spraying of the strip + rolling forming process, with high production efficiency and stable product quality. The above-mentioned slit bushing forming device 100 can meet the continuous automatic feeding of the strip and the continuous automatic forming of the slit bushing, and the processing efficiency can reach 20 pieces / minute.

[0151] Furthermore, the present application also provides a method for continuously preparing a slotted bushing, comprising:

[0152] Leveling and conveying: convey the strip forward through the feeding channel 10, and the head section of the strip can overlap a punch shaft and continue to be conveyed;

[0153] Pre-bending: The pre-bending die is moved toward the direction close to the punch axis, and the strip passing through the punch axis is extruded multiple times. The pre-bending arc groove of the pre-bending die is used to press the head section of the strip against the punch axis multiple times, so that the head section of the strip forms a pre-bent arc section;

[0154] Outer rolling forming: the outer rolling forming die 2 is moved to a preset position in a direction close to the feeding channel 10. During the continuous conveying of the strip, the pre-bent arc segment moves along the groove wall of the forming groove 21, so that the head section of the strip forms a forming arc segment 7, and the arc radius of the forming arc segment 7 is greater than the arc radius of the pre-bent arc segment;

[0155] Cutting: When the output size of the strip reaches a preset size, the cutting knife 4 is moved downward to cut the strip, thereby obtaining a straight-tube slit bushing.

[0156] The whole method pre-bends the continuously conveyed strip into a small arc, then shapes it into a large arc, and cuts the strip after the output size of the strip meets the expansion of the slit bushing, so as to obtain a straight-cylinder slit bushing, thereby realizing continuous production of the slit bushing rolling, and the processing efficiency is higher.

[0157] Furthermore, after the cutting step, the method further comprises:

[0158] Flanging: Move the flanging punch 6 with a conical head 61 to press the end of the straight unsealed bushing against a conical hole to achieve flanging, thereby obtaining a flanging type slit bushing 8. Furthermore, this method can also achieve the integrated rolling + flanging of the slit bushing, and the product has high dimensional accuracy and good consistency.

[0159] Furthermore, before the leveling and conveying step, the method further includes:

[0160] Uncoiling after coating: The metal coil after coating is uncoiled by a second uncoiling machine to form a strip with a coating on the lower surface.

[0161] Furthermore, before the curling step, the method further comprises:

[0162] Uncoiling before coating: The metal coil is unwound by a first uncoiling machine 200 to form a strip;

[0163] Sandblasting: conveying the strip into the sandblasting device 400, sandblasting the upper surface of the strip to form a sandblasting layer on the upper surface of the strip;

[0164] Cleaning: The strip after sandblasting is conveyed into the cleaning device 500 to clean the strip;

[0165] Drying: The cleaned strip is conveyed into the drying device 600 to dry the strip;

[0166] Spraying: conveying the dried strip into the molybdenum disulfide spraying machine 700, coating the upper surface of the strip with molybdenum disulfide coating to form a molybdenum disulfide coating on the sandblasting layer;

[0167] Curing: The sprayed strip is conveyed into the molybdenum disulfide curing machine 800 to cure the molybdenum disulfide coating;

[0168] Coiling: The solidified strip is conveyed to the coiler 900 for coiling to obtain a metal coil with a molybdenum disulfide coating.

[0169] The continuous unwinding + sandblasting + cleaning + drying + spraying + curing + winding process of the strip can be used to complete the continuous coating of the strip, realize the efficient and orderly automatic surface lubrication coating of the entire coil, and then obtain a surface coating layer with consistent bonding force and high thickness uniformity, and can save manpower on-site in the production workshop and improve efficiency; after the coating is completed, the unwinding + slit bushing forming is carried out again, realizing the continuous automatic production from the surface lubrication treatment of the thin strip coil to the rolling + flanging of the slit bushing, with higher production efficiency and stable product quality. The use of molybdenum disulfide coating and sandblasting of the strip surface before spraying can effectively improve the adhesion of the coating, which is more conducive to the subsequent slit bushing products to achieve better process effects when used.

[0170] The method can be specifically implemented by using the above-mentioned continuous preparation system for the slotted bushing. The specific process has been described in detail above and will not be repeated here.

[0171] It can be understood that after completing the pre-bending arc segment, the pre-bending mold moves and leaves the middle area between the leveling and feeding mechanism 1 and the outer curling forming mechanism; then the outer curling forming mold 2 is moved inward to a preset position; when the discharge size of the strip reaches the preset size, the strip stops moving, and the outer curling forming mold 2 moves outward and leaves the area between the upper curling mold 51 and the lower curling mold 52, and then the upper curling mold 51 and the lower curling mold 52 are moved toward each other. After cutting the strip, the straight cylindrical slit bushing is finely adjusted for roundness using the formed curling hole; then the flanging punch 6 is used to perform flanging operations.

[0172] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A slotted bushing forming device, characterized in that: include: A leveling feeding mechanism with a feeding channel for the strip to pass through; An external curling forming mechanism, comprising an external curling forming die capable of axial movement and having a forming groove at the end thereof, wherein the axis of the external curling forming die is parallel to the length direction of the feeding channel, and the notch of the forming groove is arranged toward the discharge end of the feeding channel; A positioning mechanism, comprising a punch shaft located between the leveling and feeding mechanism and the outer curling and forming mechanism, wherein the axis of the punch shaft is perpendicular to the length direction of the feeding channel, and the punch shaft can move axially to extend into or out of the middle area between the leveling and feeding mechanism and the outer curling and forming mechanism; The pre-bending mechanism comprises a pre-bending die having a pre-bending arc groove; the pre-bending die can extrude the strip transmitted to the punch shaft for multiple times, so that the head section of the strip forms a pre-bending arc section; the outer rolling circle forming die can axially move to a preset position after the punch shaft and the pre-bending die are separated from the middle area, so that the pre-bending arc section of the strip moves along the groove wall of the forming groove, thereby forming a forming arc section at the head section of the strip, and the arc radius of the forming arc section is greater than the arc radius of the pre-bending arc section; The cutting and unloading mechanism comprises a cutting knife which can move up and down. When the discharge size of the strip reaches a preset size, the cutting knife can move downward and cut the strip to obtain a straight-tube slit bushing.

2. The slotted bushing forming device according to claim 1, characterized in that: The pre-bending mechanism comprises an upper pre-bending mold and a lower pre-bending mold arranged in an upper and lower manner; the lower end of the upper pre-bending mold has an upper pre-bending arc groove, the axis of the upper pre-bending mold is arranged obliquely from its upper end to the lower end in a direction close to the leveling feeding mechanism, and the upper pre-bending mold can move along its axial direction; the upper end of the lower pre-bending mold has a lower pre-bending arc groove, the axis of the lower pre-bending mold is arranged obliquely from the lower end to the upper end in a direction close to the leveling feeding mechanism, and the lower pre-bending mold can move along its axial direction; The upper pre-bending die and the lower pre-bending die can alternately extrude the strip transferred to the punch shaft for multiple times, so that the head section of the strip forms a pre-bent arc segment, and the central angle corresponding to the pre-bent arc segment is 120 to 180 degrees.

3. The slotted bushing forming device according to claim 2, characterized in that: The angle between the axis of the upper pre-bending mold and the horizontal plane is 40 to 60 degrees, and the angle between the axis of the lower pre-bending mold and the horizontal plane is 35 to 55 degrees.

4. The slotted bushing forming device according to claim 1, characterized in that: The groove wall of the forming groove includes an arc surface and an inclined surface connected up and down, the central angle corresponding to the arc surface is 110-130 degrees, and the inclined surface is tangent to the edge of the arc surface.

5. The slotted bushing forming device according to claim 4, characterized in that: The arc radius of the arc surface and the curling radius of the slotted bushing product satisfy the following relationship: r=R×E Wherein, r represents the arc radius of the arc surface, R represents the outer radius of the roll of the slit bushing product, and E represents the springback amount; when 2.5%≤δ / R<3.5%, E is 0.975~0.99; when 4%≤δ / R<6%, E is 0.96~0.975; when δ / R is greater than 6%, E is 0.945~0.96; δ represents the thickness of the strip.

6. The slotted bushing forming device according to claim 1, characterized in that: The slotted bushing forming device further comprises a rounding and finishing mechanism located between the leveling and feeding mechanism and the outer rounding and forming mechanism; The roundness correction mechanism comprises an upper roundness correction mold and a lower roundness correction mold which are arranged opposite to each other and can move up and down. The upper roundness correction mold and the lower roundness correction mold can be buckled up and down to enclose a roundness correction hole to perform roundness correction on the straight cylindrical slotted bushing.

7. The slotted bushing forming device according to claim 6, characterized in that: An upper arc groove is formed on the bottom surface of the upper circular correction mold, and the cutting knife is arranged on the bottom surface of the upper circular correction mold and close to the edge of the upper arc groove; a lower arc groove and a receiving groove are formed on the top surface of the lower circular correction mold, and when the upper circular correction mold and the lower circular correction mold are buckled together, the upper arc groove and the lower arc groove can enclose to form the circular correction hole, and the cutting knife can be received in the receiving groove.

8. The slotted bushing forming device according to claim 7, characterized in that: Two convex strips are provided on the bottom surface of the upper circular mold and on both sides of the upper arc groove, and two clamping grooves are provided on the top surface of the lower circular mold and on both sides of the lower arc groove. The portion of the convex strip away from the upper arc groove is formed with an arc chamfer, and the groove wall of the clamping groove away from the lower arc groove is formed with an arc groove wall, and the convex strip can be clamped in the corresponding clamping groove.

9. The slotted bushing forming device according to claim 6, characterized in that: The slotted bushing forming device further comprises a flanging mechanism; the flanging mechanism comprises an axially movable flanging punch, the axis of which is perpendicular to the length direction of the feeding channel and can be coaxial with the rounding hole; An upper flanging groove and a lower flanging groove are respectively formed at the ends of the upper and lower rounding dies close to the flanging punch. The upper and lower flanging grooves can form a tapered hole connected to the round hole when the upper and lower rounding dies are buckled together. The aperture of the tapered hole gradually increases from the round hole to the flanging punch. The head of the flanging punch is a conical head. The flanging punch can squeeze the end of the straight-cylinder slit bushing against the tapered hole to form a flanging-type slit bushing.

10. The slotted bushing forming device according to claim 1, characterized in that: The leveling feeding mechanism includes an upper flat plate and a lower support plate arranged up and down, the upper surface of the lower support plate is provided with a conveying groove, the conveying groove and the upper flat plate form the feeding channel, and the extension direction of the bottom surface of the conveying groove can be tangent to the outer side surface of the punch shaft.

11. The slotted bushing forming device according to claim 1, characterized in that: A feeding wheel assembly is also provided outside the feeding end of the feeding channel, and the feeding wheel assembly includes an upper feeding wheel and a lower feeding wheel which are arranged opposite to each other up and down, and is used to clamp the strip and drive the strip to move and transport; the lower surface of the strip has a coating, the upper feeding wheel is a metal wheel, and the lower feeding wheel is a plastic wheel.

12. The slotted bushing forming device according to claim 1, characterized in that: The slit bushing forming device also includes an unwinding machine for unwinding the metal coil coated with a coating to form a strip, and the unwinding strip is conveyed into the feeding channel.

13. The slotted bushing forming device according to claim 1, characterized in that: The slit bushing forming device also includes a controller, which is electrically connected to the positioning mechanism, the pre-bending mechanism, the outer curling forming mechanism and the cutting and blanking mechanism.

14. A system for continuously preparing a slotted bushing, characterized in that: The continuous preparation system for the slit bushing includes a control device, a first uncoiler, a sandblasting device, a cleaning device, a drying device, a molybdenum disulfide sprayer, a molybdenum disulfide curing machine and a winder which are sequentially arranged along the first strip conveying direction and are all electrically connected to the control device, and a second uncoiler which is sequentially arranged along the second strip conveying direction and is all electrically connected to the control device, and a slit bushing forming device according to any one of claims 1 to 13; The first uncoiler is used to open the metal coil to form a strip; the sandblasting device is used to sandblast the upper surface of the strip to form a sandblasting layer on the upper surface of the strip; The molybdenum disulfide spraying machine is used to apply a molybdenum disulfide coating to the upper surface of the strip to form a molybdenum disulfide coating on the sandblasting layer; The molybdenum disulfide curing machine is used to cure the molybdenum disulfide coating; The second uncoiler is used to unwind the metal coil coated with a coating to form a strip with a coating, and the feeding channel is used to allow the strip with a coating to pass through.

15. The system for continuously preparing a slotted bushing according to claim 14, characterized in that: The system for continuously preparing the slit liner further comprises a transfer device for transferring the metal coil with the coating formed after the winding of the winding machine to the second uncoiler.

16. The system for continuously preparing a slotted liner according to claim 14, characterized in that: Calculated by weight percentage, the molybdenum disulfide coating consists of 25-30% of molybdenum disulfide, 35-55% of phenolic resin, 5-10% of lubricant and the balance of organic solvent; the lubricant consists of polytetrafluoroethylene, lead powder and graphite powder, and the weight ratio is (2-4):(2-4):1; the organic solvent is ethylene glycol ethyl ether acetate.

17. The system for continuously preparing a slotted liner according to claim 16, characterized in that: The spraying distance of the molybdenum disulfide spraying machine is 150-200 mm, the spraying pump speed is 3.0-8.0 g / min, and the temperature of the spraying chamber is 40-60° C.; the curing temperature of the molybdenum disulfide curing machine is 180-200° C.

18. The system for continuously preparing a slotted liner according to claim 14, characterized in that: A straightening wheel assembly is also provided between the first uncoiler and the sandblasting device, and the straightening wheel assembly includes a plurality of upper straightening wheels arranged at intervals and a plurality of lower straightening wheels arranged at intervals, and the plurality of upper straightening wheels and the plurality of lower straightening wheels are staggered along the first strip conveying direction.

19. The system for continuously preparing a slotted liner according to claim 14, characterized in that: A roughness detector is provided between the sandblasting device and the cleaning device and near the sandblasting outlet thereof, for detecting the surface roughness of the strip; the control device is electrically connected to the roughness detector, and can control the prompter to emit a prompt sound when the roughness detected by the roughness detector is less than a preset value, and can also adjust the pressure, speed and sandblasting amount of the sandblasting gun of the sandblasting device according to the data detected by the roughness detector.

20. The system for continuously preparing a slotted liner according to claim 14, characterized in that: A water-absorbing cotton strip is provided at the cleaning outlet of the cleaning device; a sponge block is also provided between the molybdenum disulfide spraying machine and the molybdenum disulfide curing machine for wiping the lower surface of the strip.

21. The system for continuously preparing a slotted liner according to claim 14, characterized in that: The drying temperature of the drying device is 120-150°C, and the speed of the strip moving is 10-20m / s; A humidity detector is provided in the drying device. The control device is electrically connected to the humidity detector and can adjust the temperature in the drying device according to data detected by the humidity detector.

22. The system for continuously preparing a slotted liner according to claim 14, characterized in that: The molybdenum disulfide spraying machine is also connected to a molybdenum disulfide feed box, in which a stirrer is arranged; a thickness detector is also arranged in the molybdenum disulfide spraying machine for detecting the thickness of the molybdenum disulfide coating; a thermometer is also arranged between the molybdenum disulfide spraying machine and the molybdenum disulfide curing machine for detecting the temperature of the molybdenum disulfide coating; The control device is electrically connected to the agitator, the thickness detector and the thermometer, and can adjust the coating time of the molybdenum disulfide sprayer according to the data detected by the thickness detector, and can also control the curing temperature of the molybdenum disulfide curing machine according to the data detected by the thermometer.

23. A method for continuously preparing a slotted bushing, characterized in that: include: Leveling conveying: convey the strip forward through the feeding channel, the head section of the strip can overlap a punch shaft and continue to convey; Pre-bending: The pre-bending die is moved toward the direction close to the punch axis, and the strip passing through the punch axis is extruded multiple times. The pre-bending arc groove of the pre-bending die is used to press the head section of the strip against the punch axis multiple times, so that the head section of the strip forms a pre-bent arc section; Outer rolling forming: the outer rolling forming die is moved to a preset position in the direction close to the feeding channel. During the continuous conveying of the strip, the pre-bent arc segment moves along the groove wall of the forming groove, so that the head section of the strip forms a forming arc segment, and the arc radius of the forming arc segment is greater than the arc radius of the pre-bent arc segment; Cutting: When the output size of the strip reaches the preset size, the cutting knife moves downward and cuts the strip to obtain a straight-tube slit bushing.

24. The method for continuously preparing a slotted bushing according to claim 23, characterized in that: After the cutting step, it also includes: Flanging: Move the flanging punch with a conical head to press the end of the straight-tube unsealed bushing against a conical hole to achieve flanging, thereby obtaining a flanging-type slit bushing.

25. The method for continuously preparing a slotted bushing according to claim 23, characterized in that: Before the leveling transfer step also includes: Uncoiling after coating: The metal coil after coating is uncoiled by a second uncoiling machine to form a strip with a coating on the lower surface.

26. The method for continuously preparing a slotted bushing according to claim 25, characterized in that: Before the curling step, it also includes: Uncoiling before coating: The metal coil is unwound by the first uncoiling machine to form a strip; Sandblasting: conveying the strip into the sandblasting device, sandblasting the upper surface of the strip to form a sandblasting layer on the upper surface of the strip; Cleaning: The strip after sandblasting is conveyed into the cleaning device to clean the strip; Drying: The cleaned strip is conveyed into the drying device to dry the strip; Spraying: conveying the dried strip into a molybdenum disulfide spraying machine, coating the upper surface of the strip with a molybdenum disulfide coating to form a molybdenum disulfide coating on the sandblasting layer; Curing: conveying the sprayed strip into a molybdenum disulfide curing machine to cure the molybdenum disulfide coating; Coiling: The solidified strip is conveyed into the coiler for coiling to obtain a metal coil with a molybdenum disulfide coating.

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