A R7 coating combined environmentally friendly rivet surface treatment process and galvanizing equipment

Abstract

The present invention belongs to the field of surface treatment technology, and discloses an R7 coating combined environmentally friendly rivet surface treatment process and galvanizing equipment. The R7 coating combined environmentally friendly rivet surface treatment process comprises the following steps: 1) taking the rivet for chemical degreasing and then washing with water, followed by acid etching → circulating water washing → neutralization circulating water washing → acid activation → circulating water washing → neutralization → rolling galvanizing → circulating water washing; 2) loading the rivet treated in 1) into the galvanizing equipment to perform zinc trivalent chromium black passivation on its surface. The R7 coating combined environmentally friendly rivet surface treatment process is different from the traditional riveting method. The present application first performs a coating treatment on the rivet, that is, zinc trivalent chromium black passivation is first performed on the surface of the rivet, and then a black silane high corrosion protection topcoat is dipped (sprayed) and dried, and then assembled on a frame that has been treated with cathodic electrophoretic paint, which fundamentally eliminates the problem of yellow water flowing from the gap between the rivet and the frame in the original riveting process method, and the problem of loose surface rivets and early failure occurs.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment, and in particular to an R7 coating combined environmentally friendly rivet surface treatment process and galvanizing equipment. Background Art

[0002] At present, when riveting automobile parts and frames, rivets are originally connected directly to the frame steel plates with white parts, and are treated with cathodic electrophoretic paint after assembly. During the electrophoretic process, the electrophoretic paint is not electrophoresed on the gaps, and yellow water flows out of the gaps during installation and use, which not only affects the appearance, but also causes the rivets to fail early. To address this problem, the present application provides an R7 electroplating combined environmentally friendly rivet surface treatment process and galvanizing equipment. Summary of the invention

[0003] The purpose of the invention is to provide an R7-coated combined environmentally friendly rivet surface treatment process. The R7-coated combined environmentally friendly rivet surface treatment process and galvanizing equipment solve the technical problems of yellow water flowing through the gap after rivet riveting, early falling off and early failure in the prior art.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] An R7 coating combined environmentally friendly rivet surface treatment process comprises the following steps:

[0006] 1) Take the rivet and perform chemical degreasing and water washing, followed by acid etching → circulating water washing → neutralization circulating water washing → acid activation → circulating water washing → neutralization → roller galvanizing → circulating water washing, and then dry for use;

[0007] 2) placing the rivets treated in 1) into a galvanizing device to perform zinc plating and trivalent chromium black passivation on their surfaces, and after the treatment is completed, washing, centrifugal separation and drying;

[0008] 3) Dip-coat the bottom coating of the rivet with a black silane-based high-corrosion-resistant topcoat twice, and centrifuge and dry to cure between the two times;

[0009] 4) placing the rivet dip-coated in step 3) into a centrifuge at a speed of 200-400 rpm and drying for 10-30 seconds;

[0010] 5) Drying: Dry at 120-200 degrees for 20-40 minutes to complete the rivet processing.

[0011] Preferably, the method further comprises the following steps:

[0012] 6) During assembly, the parts to be assembled are first subjected to cathode electrophoresis treatment, and after completion, the rivets obtained in step 5) are assembled on the parts to be assembled.

[0013] Preferably, in step 2), the thickness of the bottom galvanized layer is ≥ 8 μm.

[0014] Preferably, in step 3), the concentration of the top coating liquid is 20-26%, the dipping time is 15S, and the coating thickness is controlled at 2-4 μm.

[0015] A galvanizing device includes a galvanizing pool, a lifting mechanism, and a rivet clamping mechanism. A pole plate 1 is installed at the bottom of the galvanizing pool. The lifting mechanism includes a mounting rod, a mounting plate, a cylinder, a positioning plate, a placement groove, a pole plate 2, a magnet plate, a positioning groove and a square hole. The bottom ends of the four mounting rods are respectively fixedly connected to the four corners of the upper surface of the galvanizing pool, and the top ends of the four mounting rods are respectively fixedly connected to the four corners of the lower surface of the mounting plate. The upper surface of the mounting plate is fixedly connected to the cylinder through a mounting frame. The square hole is provided on the mounting plate at a position corresponding to the cylinder. The output end of the cylinder passes through the square hole and extends to the lower side of the mounting plate. The positioning plate is fixedly connected to the output end of the cylinder. The lower surface of the positioning plate is provided with a placement groove open on the left and right. The bottom wall of the placement groove is fixedly connected to the pole plate 2 by screws. A magnet plate is inserted into the cavity in the positioning plate, and positioning grooves are provided on the front and rear side walls of the placement groove.

[0016] Preferably, the rivet clamping mechanism includes an insert plate, a positioning strip, a circular hole, a movable column, a clamping plate and a positioning protrusion. The insert plate is located in the placement groove and the positioning strips in front and behind it are respectively inserted into the two positioning grooves. The insert plate is provided with evenly distributed circular holes, and the movable column is inserted into the circular holes. Four clamping plates are fixedly connected to the bottom end of the movable column, and the bottom ends of the four clamping plates extend to the lower side of the insert plate. A positioning protrusion is provided at the bottom end of the clamping plate close to the axis of the movable column.

[0017] Preferably, the four clamps are arranged in a ring shape with the axis of the movable column as a reference, and the top of the clamp is fixedly connected to the edge of the bottom end surface of the movable column. The rivet head is fixed by the positioning protrusions on the four clamps to ensure that the rivet is fixed and the rivet surface is fully galvanized.

[0018] Preferably, the clamp is a long spring leaf, and the angle between the clamp in a relaxed state and the bottom end surface of the movable column is degrees. The movable column is attracted by the magnet plate and a part of it extends out of the circular hole to contact the second pole plate, and a part of it is pulled into the circular hole through the clamp to clamp the rivet.

[0019] Preferably, the cross-section of the circular hole is in the shape of an inverted truncated cone, and the diameter difference between the bottom opening of the circular hole and the top opening thereof is 1 mm. The truncated cone design of the circular hole limits the position of the movable column to prevent it from falling out of the circular hole.

[0020] Preferably, the size of the movable column matches the size of the circular hole, and when the clamp is in a relaxed state, the upper surface of the plug plate and the top surface of the movable column are in the same plane, and the gap between the upper surface of the plug plate and the lower surface of the second electrode plate is 5 mm.

[0021] Preferably, the movable columns are iron columns, the number of movable columns is not less than ten, and the straight-line distance between adjacent movable columns is not less than 5 cm. Sufficient spacing can ensure that the concentration of the galvanizing solution is sufficient to fully treat each rivet.

[0022] Preferably, a partition is fixedly connected between the front and rear side walls of the galvanizing pool, the bottom of the partition is 5 cm away from the bottom wall of the galvanizing pool, and the partition is provided with evenly distributed through holes, the diameter of the through holes is 1 cm and the number of the through holes is not less than 50.

[0023] Preferably, the partition divides the galvanizing pool into two left and right sections, the positioning plate is located on the left side of the partition, and the top of the partition is flush with the galvanizing liquid level. During the galvanizing process, the cylinder reciprocates up and down to keep the plug plate in the galvanizing liquid to shake the liquid level, so that the galvanizing liquid on both sides of the partition in the galvanizing pool can be quickly exchanged. In this way, more galvanizing liquid can be added to the galvanizing pool. During mass production, the efficient circulation of the galvanizing liquid can reduce the frequency of replacing the galvanizing liquid.

[0024] After the rivets are treated with R7 combined plating, the salt spray test time before riveting is more than 480 hours, the sulfur dioxide resistance test time is more than 72 hours, the salt spray resistance test time after riveting is more than 300 hours, and the exposed white area after riveting is less than 20%, which completely solves the problem of yellow water flowing from the gap between domestic rivets and steel plates after riveting, and improves the corrosion resistance of rivets.

[0025] By adopting the above technical solution, the beneficial effects of the present invention are:

[0026] 1. The R7 coating combined environmentally friendly rivet surface treatment process is different from the traditional riveting method. This application first performs coating treatment on the rivet, that is, the rivet surface is first zinc-plated with trivalent chromium black passivation, and then dipped (sprayed) with black silane high corrosion protection topcoat and dried, and then assembled on the frame treated with cathodic electrophoretic paint. The rivet surface is completely treated, which fundamentally eliminates the problem of yellow water flowing from the gap between the rivet and the frame and the problem of loose surface rivets and early failure caused by the original riveting process.

[0027] 2. The R7 coating combined environmentally friendly rivet surface treatment process, the galvanizing equipment used in this application, the detachable fixed tooling, is improved for the batch processing needs of small parts such as rivets, and can process multiple rivets at the same time, with convenient switching and fixing. By utilizing the design of the partition and coordinating with the movement of the cylinder, more galvanizing liquid can be added to the galvanizing pool. In the process of batch production, the efficient circulation of the galvanizing liquid can reduce the frequency of changing the galvanizing liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front cross-sectional view of the galvanizing equipment of the present invention;

[0029] Figure 2 It is a right side view of the rivet clamping mechanism of the present invention;

[0030] Figure 3 For the present invention Figure 1 The enlarged view of point A in the middle;

[0031] Figure 4 It is a schematic diagram of the rivet clamping mechanism of the present invention clamping the rivet.

[0032] In the figure: 1 galvanizing pool, 2 lifting mechanism, 21 mounting rod, 22 mounting plate, 23 cylinder, 24 positioning plate, 25 placement slot, 26 pole plate 2, 27 magnet plate, 28 positioning slot, 29 square hole, 3 rivet clamping mechanism, 31 plug plate, 32 positioning strip, 33 round hole, 34 movable column, 35 clamping plate, 36 positioning protrusion, 4 pole plate 1, 5 partition plate, 6 through hole. DETAILED DESCRIPTION

[0033] See also Figure 1-4 The present invention provides a technical solution: an R7 coating combined environmentally friendly rivet surface treatment process, which solves the technical problems of yellow water flowing through the gap, early falling off and early failure of rivets after riveting in the prior art.

[0034] To achieve the above objectives, the present invention is implemented through the following technical solutions: a surface treatment process of an R7-plated combined environmentally friendly rivet, the processing process comprising the following steps:

[0035] 1) Take the rivets for chemical degreasing and water washing, followed by acid etching → circulating water washing → neutralization circulating water washing → acid activation → circulating water washing → neutralization → roller galvanizing → circulating water washing, and then dry for use.

[0036] 2) The rivets treated in 1) are placed in a galvanizing device for galvanizing and trivalent chromium black passivation on their surfaces. After the treatment is completed, they are washed with water, centrifuged and dried.

[0037] 3) The bottom coating is dip-coated with a black silane-based high-corrosion protection top coating liquid twice, and centrifuged and dried for curing between the two times.

[0038] 4) Step 3) The rivets after dip coating are dried in a centrifuge at a speed of 200-400 rpm for 10-30 seconds.

[0039] 5) Drying: Dry at 160 degrees for 30 minutes to complete the rivet processing.

[0040] 6) Perform cathode electrophoresis treatment on the vehicle frame (i.e., the part to be assembled), and after the treatment, assemble the rivets obtained in step 5) on the vehicle frame. Of course, the part to be assembled may also be other parts.

[0041] The galvanizing equipment used in the above step 2) includes a galvanizing pool 1, a lifting mechanism 2, and a rivet clamping mechanism 3. A pole plate 4 is installed at the bottom of the galvanizing pool 1. The lifting mechanism 2 includes a mounting rod 21, a mounting plate 22, a cylinder 23, a positioning plate 24, a placement groove 25, a pole plate 26, a magnet plate 27, a positioning groove 28 and a square hole 29. The bottom ends of the four mounting rods 21 are respectively fixedly connected to the four corners of the upper surface of the galvanizing pool 1, and the top ends of the four mounting rods 21 are respectively fixedly connected to the four corners of the lower surface of the mounting plate 22. The mounting plate 22 The upper surface is fixedly connected with a cylinder 23 through a mounting frame, a square hole 29 is provided on the mounting plate 22 at a position corresponding to the cylinder 23, the output end of the cylinder 23 extends through the square hole 29 to the lower side of the mounting plate 22, a positioning plate 24 is fixedly connected to the output end of the cylinder 23, a placement groove 25 open on the left and right is provided on the lower surface of the positioning plate 24, a pole plate 26 is fixedly connected to the bottom wall of the placement groove 25 by screws, a magnet plate 27 is inserted into the inner cavity of the positioning plate 24, and positioning grooves 28 are provided on the front and rear side walls of the placement groove 25.

[0042] The rivet clamping mechanism 3 includes an insert plate 31, a positioning strip 32, a circular hole 33, a movable column 34, a clamp plate 35 and a positioning protrusion 36. The insert plate 31 is located in the placement groove 25 and the positioning strips 32 in front and behind it are respectively inserted into the two positioning grooves 28. The insert plate 31 is provided with evenly distributed circular holes 33, and the movable column 34 is inserted into the circular hole 33. Four clamp plates 35 are fixedly connected to the bottom end of the movable column 34, and the bottom ends of the four clamp plates 35 extend to the lower side of the insert plate 31. A positioning protrusion 36 is provided at the bottom end of the clamp plate 35 close to the axis of the movable column 34.

[0043] In step 2), the thickness of the bottom zinc coating is ≥8 μm, and the zinc coating is passivated to significantly improve its protectiveness and decorative properties.

[0044] In step 3), the concentration of the top coating liquid is 20-26%, the dipping time is 15S, and the coating thickness is controlled at 2-4μm.

[0045] The four clamping plates 35 are arranged in a ring shape with the axis of the movable column 34 as a reference, and the top ends of the clamping plates 35 are fixedly connected to the edge of the bottom end surface of the movable column 34. The rivet heads are fixed by the positioning protrusions 36 on the four clamping plates 35 to ensure that the rivets are fixed and the rivet surfaces are fully galvanized.

[0046] The clamp 35 is a long spring leaf. The angle between the clamp 35 in the relaxed state and the bottom end surface of the movable column 34 is 120 degrees. The movable column 34 is attracted by the magnet plate 27 and a part of it extends out of the circular hole 33 and contacts the pole plate 26. A part of it is pulled into the circular hole 33 through the clamp 35 to clamp the rivet.

[0047] The cross section of the circular hole 33 is in the shape of an inverted truncated cone, and the diameter difference between the bottom opening of the circular hole 33 and the top opening thereof is 1 mm. The truncated cone design of the circular hole 33 limits the position of the movable column 34 to prevent it from falling out of the circular hole 33.

[0048] The size of the movable column 34 matches the size of the circular hole 33. When the clamp 35 is in a relaxed state, the upper surface of the plug plate 31 and the top surface of the movable column 34 are in the same plane, and the gap between the upper surface of the plug plate 31 and the lower surface of the electrode plate 26 is 5 mm.

[0049] The movable columns 34 are iron columns, the number of the movable columns 34 is not less than ten, and the straight-line distance between adjacent movable columns 34 is not less than 5 cm. Sufficient spacing can ensure that the concentration of the galvanizing solution is sufficient to fully treat each rivet.

[0050] A partition 5 is fixedly connected between the front and rear side walls of the galvanizing pool 1, and the bottom of the partition 5 is 5 cm away from the bottom wall of the galvanizing pool 1. The partition 5 is provided with evenly distributed through holes 6, and the diameter of the through holes 6 is 1 cm and the number of the through holes 6 is not less than 50.

[0051] The partition 5 divides the galvanizing pool 1 into two left and right sections. The positioning plate 24 is located on the left side of the partition 5. The top of the partition is flush with the galvanizing liquid level. During the galvanizing process, the cylinder 23 reciprocates up and down to keep the plug plate 31 in the galvanizing liquid to shake the liquid level, so that the galvanizing liquid on both sides of the partition 5 in the galvanizing pool 1 can be quickly exchanged. In this way, more galvanizing liquid can be added to the galvanizing pool. In the process of mass production, the efficient circulation of the galvanizing liquid can reduce the frequency of replacing the galvanizing liquid.

[0052] After the rivets are treated with R7 combined plating, the salt spray test time before riveting is more than 480 hours, the sulfur dioxide resistance test time is more than 72 hours, the salt spray resistance test time after riveting is more than 300 hours, and the exposed white area after riveting is less than 20%, which completely solves the problem of yellow water flowing from the gap between domestic rivets and steel plates after riveting, and improves the corrosion resistance of rivets.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An R7 coating combined environmentally friendly rivet surface treatment process, characterized by: The following steps are included: 1) Take the rivet and perform chemical degreasing and water washing, followed by acid etching → circulating water washing → neutralization circulating water washing → acid activation → circulating water washing → neutralization → galvanizing → circulating water washing, and then dry for standby use; 2) placing the rivets treated in 1) into a galvanizing device to perform zinc plating and trivalent chromium black passivation on their surfaces, and after the treatment is completed, washing, centrifugal separation and drying; 3) Dip-coat the bottom coating of the rivet with a black silane-based high-corrosion-resistant topcoat twice, and centrifuge and dry to cure between the two times; 4) placing the rivet dip-coated in step 3) into a centrifuge at a speed of 200-400 rpm and drying for 10-30 seconds; 5) Drying: Dry at 120-200 degrees for 20-40 minutes to complete the rivet processing; The galvanizing equipment comprises a galvanizing pool (1), a lifting mechanism (2), and a rivet clamping mechanism (3). A pole plate (4) is installed at the bottom of the galvanizing pool (1). The lifting mechanism (2) comprises a mounting rod (21), a mounting plate (22), a cylinder (23), a positioning plate (24), a placement groove (25), a pole plate (26), a magnet plate (27), a positioning groove (28), and a square hole (29). The bottom ends of the four mounting rods (21) are respectively fixedly connected to the upper surface of the galvanizing pool (1). The top ends of the four mounting rods (21) are respectively fixedly connected to the four corners of the lower surface of the mounting plate (22); the upper surface of the mounting plate (22) is fixedly connected to the cylinder (23) through a mounting frame; a square hole (29) is opened on the mounting plate (22) at a position corresponding to the cylinder (23); the output end of the cylinder (23) passes through the square hole (29) and extends to the lower side of the mounting plate (22); the positioning plate (24) is fixedly connected to the output end of the cylinder (23); and the lower surface of the positioning plate (24) is provided with left and right openings. The placement groove (25) is provided, the bottom wall of the placement groove (25) is fixedly connected with a pole plate (26) by screws, a magnet plate (27) is inserted into the cavity of the positioning plate (24), and positioning grooves (28) are provided on the front and rear side walls of the placement groove (25); the rivet clamping mechanism (3) comprises an inserting plate (31), a positioning strip (32), a circular hole (33), a movable column (34), a clamping plate (35) and a positioning protrusion (36), the inserting plate (31) is located in the placement groove (25) and The front and rear positioning strips (32) are respectively inserted into the two positioning grooves (28); the plug plate (31) is provided with evenly distributed round holes (33); the movable column (34) is inserted into the round holes (33); the bottom end of the movable column (34) is fixedly connected with four clamping plates (35); the bottom ends of the four clamping plates (35) all extend to the lower side of the plug plate (31); the bottom end of the clamping plate (35) close to the axis of the movable column (34) is provided with a positioning protrusion (36); the movable column (34) is an iron column.

2. The R7 coating combined environmentally friendly rivet surface treatment process according to claim 1 is characterized by: The following steps are also included: 6) During assembly, the parts to be assembled are first subjected to cathode electrophoresis treatment, and after completion, the rivets obtained in step 5) are assembled on the parts to be assembled.

3. The R7 coating combined environmentally friendly rivet surface treatment process according to claim 1 is characterized by: In the step 2), the thickness of the bottom zinc coating is ≥8 μm.

4. The R7 coating combined environmentally friendly rivet surface treatment process according to claim 1 is characterized by: In the step 3), the concentration of the top coating liquid is 20-26%, the dipping time is 15S, and the coating thickness is controlled at 2-4μm.

5. The R7 coating combined environmentally friendly rivet surface treatment process according to claim 1 is characterized by: The four clamping plates (35) are arranged in a ring shape with the axis of the movable column (34) as a reference, and the top ends of the clamping plates (35) are fixedly connected to the edge of the bottom end surface of the movable column (34).

6. The R7 coating combined environmentally friendly rivet surface treatment process according to claim 5 is characterized by: The clamping plate (35) is a long spring leaf, and the angle between the clamping plate (35) in a relaxed state and the bottom end surface of the movable column (34) is 120 degrees; the cross section of the circular hole (33) is in the shape of an inverted truncated cone, and the diameter difference between the bottom opening of the circular hole (33) and the top opening thereof is 1 mm.

7. The R7 coating combined environmentally friendly rivet surface treatment process according to claim 6 is characterized by: The size of the movable column (34) matches the inner size of the circular hole (33); when the clamp (35) is in a relaxed state, the upper surface of the plug plate (31) and the top end surface of the movable column (34) are in the same plane; and the gap between the upper surface of the plug plate (31) and the lower surface of the second electrode plate (26) is 5 mm.

8. The R7 coating combined environmentally friendly rivet surface treatment process according to claim 7 is characterized by: The number of the movable columns (34) is not less than ten, and the straight-line distance between adjacent movable columns (34) is not less than 5 cm; a partition (5) is fixedly connected between the front and rear side walls of the galvanizing pool (1), the bottom of the partition (5) is 5 cm away from the bottom wall of the galvanizing pool (1), and the partition (5) is provided with evenly distributed through holes (6), the diameter of the through holes (6) is 1 cm and the number is not less than 50; the partition (5) divides the galvanizing pool (1) into two sections, left and right, and the positioning plate (24) is located on the left side of the partition (5).

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