Metal and non-metal composite board forming process with high-precision surface requirement

Abstract

According to the metal and nonmetal composite plate forming process with the high-precision surface requirement, the material characteristics of a polytetrafluoroethylene plate are combined in the process, the epoxy resin glue is matched with the YF-6911 glue, firm bonding and compounding between a metal plate and the polytetrafluoroethylene plate can be achieved, and the compounding reliability is guaranteed; and meanwhile, the machining technology that compounding is conducted firstly and then the top layer surface is conducted is adopted, the machining frequency of a single plate is reduced, the machining cost is effectively reduced, the machining difficulty is lowered, and the final surface machining precision is guaranteed.

Description

Technical Field

[0001] The invention relates to a metal and non-metal composite plate forming process with high-precision surface requirements, and belongs to the technical field of composite plate processing. Background Art

[0002] PTFE sheet is a polymer compound made of PTFE, which has excellent chemical stability and corrosion resistance. It is widely used in various environments that require acid, alkali and organic solvent resistance, sealing, high lubrication and non-stickiness. When used in the machinery industry, in order to ensure good dimensional accuracy, the PTFE sheet needs to be bonded to the steel parts before processing.

[0003] In order to realize the composite between the polytetrafluoroethylene plate and the metal plate, and ensure the surface finish and dimensional accuracy of the polytetrafluoroethylene plate after composite. At present, the processing technology used is, first, to process the metal plate separately, and ensure the surface finish and dimensional accuracy of the top and bottom end faces of the metal plate; then, to process the polytetrafluoroethylene plate separately, and ensure the surface finish and dimensional accuracy of the top and bottom end faces of the polytetrafluoroethylene plate; after the metal plate and the polytetrafluoroethylene plate are processed, the two plates are bonded by using YF-6911 polytetrafluoroethylene adhesive and polytetrafluoroethylene activator, and after the bonding is completed, the surface dimensional accuracy of the top polytetrafluoroethylene plate after composite is reviewed, and finally the surface is finely processed.

[0004] The problems with existing composite molding processes are: (1) It is necessary to process the metal plate and the polytetrafluoroethylene plate separately and ensure the processing accuracy of each processing. The processing is difficult and the processing cost is relatively high; (2) The dimensional accuracy of the plate after the final composite cannot be guaranteed by separate processing and then compounding. It needs to be processed again to ensure the dimensional accuracy, and the processing cost is relatively high; (3) Since the thickness of the polytetrafluoroethylene sheet is small and its rigidity is insufficient, it is inconvenient to clamp it during the processing of it alone, and the processing accuracy is difficult to ensure; (4) In the process of bonding metal plates and polytetrafluoroethylene plates, the existing polytetrafluoroethylene adhesives are mainly YF-6911 polytetrafluoroethylene adhesives used in combination with polytetrafluoroethylene activators. However, this type of adhesive is only suitable for bonding polytetrafluoroethylene of the same type. Since the surface of the polytetrafluoroethylene plate has high lubricity, chemical stability and corrosion resistance, this type of adhesive cannot complete the heterogeneous bonding between polytetrafluoroethylene and steel parts, and the bonding strength and stability of the two cannot be guaranteed. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a metal and non-metal composite plate forming process with high-precision surface requirements. This process combines the material properties of the polytetrafluoroethylene plate and adopts epoxy resin glue in combination with YF-6911 glue to achieve a firm bonding composite between the metal plate and the polytetrafluoroethylene plate, thereby ensuring the composite reliability. At the same time, the process of first composite and then top layer surface processing is adopted, which reduces the number of times a single plate is processed, effectively reduces the processing cost, reduces the processing difficulty, and ensures the final surface processing accuracy.

[0006] In order to realize the above technical features, the object of the present invention is achieved as follows: a metal and non-metal composite plate forming process with high-precision surface requirements comprises the following steps: Step 1, rough machining the surface of the metal plate to be composited; Step 2, roughening the surface of the polytetrafluoroethylene plate to be composited; Step 3, using a polytetrafluoroethylene surfactant to treat the surface to be composited of the polytetrafluoroethylene plate after the roughening process; Step 4, cleaning the surfaces of the metal plate and the polytetrafluoroethylene plate to be laminated; Step 5, use YF-6911 glue to scrape the cleaned surface of the polytetrafluoroethylene plate to be composited; Step 6, mixing epoxy resin glue and polyamide resin in a certain volume ratio, stirring evenly and then scraping and coating the mixture on the surface of the metal plate to be composited; Step 7, placing the non-composite surface support of the polytetrafluoroethylene plate on the top of the pre-processed pressing plate, and setting baffles on both sides of the pressing plate to limit the polytetrafluoroethylene plate, and then pressing the composite surface of the metal plate against the composite surface of the polytetrafluoroethylene plate after limiting, and then using the clamping bolts to match the threaded holes on the pressing plate, so as to press and bond the metal plate and the polytetrafluoroethylene plate; Step 8, placing the pressed metal plate and polytetrafluoroethylene plate as a whole in a ventilated environment, with the ambient temperature ≥15°C and the fixing time ≥24 hours; Step 9, after the glue solidifies, remove the clamping bolts, baffles and pressure plates. At this time, the polytetrafluoroethylene sheet and the metal sheet are firmly bonded; Step 10, clamping the composite metal plate and polytetrafluoroethylene plate to the top of the workbench, and processing the surface of the polytetrafluoroethylene plate to meet the designed surface finish and dimensional accuracy.

[0007] When the surface of the metal plate to be composited is roughly processed in step 1, the surface of the metal plate to be composited has a smoothness within 12.5.

[0008] In the step 2, the surface of the polytetrafluoroethylene plate to be composited is roughened by sandblasting or manual roughening with electric tools to roughen the bonding surface of the polytetrafluoroethylene plate to improve the surface adhesion of the bonding surface of the polytetrafluoroethylene plate.

[0009] The specific method for treating the surface to be composited of the polytetrafluoroethylene plate in step 3 is to scrape the polytetrafluoroethylene surfactant onto the roughened surface of the polytetrafluoroethylene plate, scrape again after every 15 to 30 minutes, and scrape 3 to 5 times in total.

[0010] In step 4, anhydrous ethanol is used to clean the surfaces of the metal plate and the polytetrafluoroethylene plate to be composited after being treated, so as to ensure that there is no dust and oily substances on the bonding surfaces to be composited.

[0011] The YF-6911 glue in step 5 includes glue A and glue B. During the preparation process, glue A and glue B are mixed in a weight ratio of 1:1, stirred evenly, and then applied to the surface to be composited of the polytetrafluoroethylene plate.

[0012] In step 6, E-44 epoxy resin glue and low molecular weight 650 polyamide resin are mixed in a volume ratio of 1:1.

[0013] Steps 5 to 7 should be performed consecutively, with the interval time not exceeding 1 hour.

[0014] In step 7, during the bonding and pressing process of the metal plate and the polytetrafluoroethylene plate, in order to prevent the glue from overflowing during bonding, the block, the pressure plate or the position in the processed hole that does not need to be bonded can be protected by applying butter or dimethyl silicone oil to the position that does not need to be bonded.

[0015] In step 7, if the polytetrafluoroethylene plate needs to be processed with holes, the holes are processed first and then bonded.

[0016] The present invention has the following beneficial effects: 1. The present invention adopts a pre-processing method to perform preliminary processing on the surface of the metal plate to improve the surface finish of the metal plate.

[0017] 2. The present invention improves the adhesive force of the glue on the surface of the polytetrafluoroethylene plate by sandblasting or electric tool grinding.

[0018] 3. By using polytetrafluoroethylene activator to treat the surface of polytetrafluoroethylene, the bonding strength between the subsequent YF-6911 glue and the polytetrafluoroethylene plate can be enhanced.

[0019] 4. The present invention ensures the stability of subsequent bonding by using anhydrous ethanol to clean the surface of the metal plate and the surface of polytetrafluoroethylene.

[0020] 5. By applying the YF-6911 glue mixture and the E-44 epoxy resin glue and low molecular 650 polyamide resin glue mixture on the surface of the polytetrafluoroethylene plate and the surface of the steel part respectively, the subsequent bonding strength of the two is guaranteed and the direct contact between the YF-6911 glue mixture and the metal surface is avoided.

[0021] 6. The present invention prevents the mixture of E-44 epoxy resin glue and low molecular weight 650 polyamide resin glue from directly contacting the surface of polytetrafluoroethylene.

[0022] 7. By adopting the process of first compounding and then processing the top surface, the number of times a single plate is processed is reduced, the processing cost is effectively reduced, the processing difficulty is reduced, and the final surface processing accuracy is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a bonding process diagram of the present invention.

[0025] In the figure: baffle 1, metal plate 2, polytetrafluoroethylene plate 3, pressure plate 4, butter or dimethyl silicone oil 5, tightening bolt 6. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0027] See also Figure 1 The forming process of metal and non-metal composite panels with high-precision surface requirements includes the following steps: Step 1, rough machining the surface to be composited of the metal plate 2 to be composited; Step 2, roughening the surface of the polytetrafluoroethylene plate 3 to be composited; Step 3, using a polytetrafluoroethylene surfactant to treat the surface to be composited of the polytetrafluoroethylene plate after the roughening process; Step 4, cleaning the surfaces of the metal plate 2 and the polytetrafluoroethylene plate 3 to be laminated; Step 5, using YF-6911 glue to scrape the cleaned surface of the polytetrafluoroethylene plate 3 to be composited; Step 6, using epoxy resin glue and polyamide resin to mix in a certain volume ratio, stirring evenly and then scraping and coating on the surface to be composited of the metal plate 2; Step 7, place the non-composite surface support of the polytetrafluoroethylene plate 3 on the top of the pre-processed pressing plate 4, and set baffles 1 on both sides of the pressing plate 4 to limit the polytetrafluoroethylene plate 3, and then press the composite surface of the metal plate 2 on the composite surface of the polytetrafluoroethylene plate 3 after limiting, and then use the clamping bolts 6 to match with the threaded holes on the pressing plate 4, so as to press and bond the metal plate 2 and the polytetrafluoroethylene plate 3; Step 8, placing the metal plate 2 and the polytetrafluoroethylene plate 3 after being pressed as a whole in a ventilated environment, with the ambient temperature being ≥15°C and the fixing time being ≥24 hours; Step 9, after the glue solidifies, remove the clamping bolts 6, the baffle 1 and the pressure plate 4, at which point the polytetrafluoroethylene plate 3 and the metal plate 2 are firmly bonded; Step 10, clamping the composite metal plate 2 and polytetrafluoroethylene plate 3 to the top of the workbench, and processing the surface of the polytetrafluoroethylene plate 3 to meet the designed surface finish and dimensional accuracy.

[0028] Furthermore, in the step 1, when the surface of the metal plate 2 to be bonded is rough-processed, the surface finish of the metal plate 2 to be bonded is within 12.5. By performing preliminary processing on the metal plate 2, the reliability of subsequent bonding is guaranteed.

[0029] Furthermore, in step 2, the surface of the polytetrafluoroethylene plate 3 to be composited is roughened by sandblasting or manual roughening with electric tools to roughen the bonding surface of the polytetrafluoroethylene plate to improve the surface adhesion of the bonding surface of the polytetrafluoroethylene plate. By adopting the above-mentioned roughening treatment, the bonding strength between the subsequent YF-6911 glue and the polytetrafluoroethylene plate 3 is enhanced.

[0030] Furthermore, in step 3, the specific method for treating the surface of the polytetrafluoroethylene plate to be composited is to scrape the polytetrafluoroethylene surfactant onto the roughened polytetrafluoroethylene plate surface, scrape again after every 15 to 30 minutes, and scrape 3 to 5 times in total. The polytetrafluoroethylene surfactant can improve the surface activity of the polytetrafluoroethylene plate 3 to ensure subsequent reliable bonding.

[0031] Furthermore, in step 4, anhydrous ethanol is used to clean the surfaces of the metal plate 2 and the polytetrafluoroethylene plate 3 to be composited after the treatment, so as to ensure that there is no dust and oily substances on the bonding surfaces to be composited. Through the above cleaning treatment, the reliability of the connection between the subsequent glue and the corresponding surface is guaranteed, and the problem of unreliable bonding caused by dust or oil is eliminated.

[0032] Furthermore, the YF-6911 glue in step 5 includes glue A and glue B. During the preparation process, glue A and glue B are mixed in a weight ratio of 1:1, stirred evenly, and then applied to the surface to be composited of the polytetrafluoroethylene plate 3. By using the above-mentioned two-component glue, the bonding strength is guaranteed.

[0033] Furthermore, in step 6, E-44 epoxy resin glue and low molecular weight 650 polyamide resin are mixed in a volume ratio of 1:1. By using E-44 epoxy resin glue and low molecular weight 650 polyamide resin to treat the metal plate, the direct bonding between the YF-6911 glue and the metal plate is effectively avoided, thereby ensuring the subsequent bonding strength.

[0034] Furthermore, steps 5 to 7 should be performed consecutively, and the interval time should not be greater than 1 hour. The above time interval effectively prevents the subsequent bonding performance of the glue from being reduced.

[0035] Furthermore, in step 7, during the bonding and pressing process of the metal plate 2 and the polytetrafluoroethylene plate 3, in order to prevent the glue from overflowing during bonding, the stopper 1, the pressing plate 4 or the position in the processed hole where bonding is not required is protected by applying butter or dimethyl silicone oil 5 to the position where bonding is not required, thereby facilitating the subsequent demolding.

[0036] Furthermore, in step 7, if the polytetrafluoroethylene plate 3 needs to be processed with holes, the holes are processed first and then bonded. By adopting the method of processing the holes first, it is convenient for the subsequent clamping bolts 6 to pass through.

Claims

1. Metal and non-metal composite plate forming process with high-precision surface requirements, characterized in that: The following steps are involved: Step 1, rough processing the surface to be composited of the metal plate (2) to be composited; Step 2, roughening the surface of the polytetrafluoroethylene plate (3) to be laminated; Step 3, using a polytetrafluoroethylene surfactant to treat the surface to be composited of the polytetrafluoroethylene plate after the roughening process; Step 4, cleaning the surfaces of the metal plate (2) and the polytetrafluoroethylene plate (3) to be laminated; Step 5, using YF-6911 glue to apply and scrape onto the surface of the cleaned polytetrafluoroethylene plate (3) to be composited; Step 6, using epoxy resin glue and polyamide resin to mix in a certain volume ratio, stirring evenly and then scraping and coating on the surface to be composited of the metal plate (2); Step 7, placing the non-composite surface support of the polytetrafluoroethylene plate (3) on the top of the pre-processed pressing plate (4), and arranging baffles (1) on both sides of the pressing plate (4) to limit the position of the polytetrafluoroethylene plate (3), and then pressing the composite surface of the metal plate (2) against the composite surface of the polytetrafluoroethylene plate (3) after the limit, and then using the clamping bolts (6) to match with the threaded holes on the pressing plate (4), so as to press and bond the metal plate (2) and the polytetrafluoroethylene plate (3); Step 8, placing the metal plate (2) and the polytetrafluoroethylene plate (3) after being pressed together in a ventilated environment, with the ambient temperature being ≥15°C and the fixing time being ≥24 hours; Step 9, after the glue solidifies, remove the clamping bolts (6), the baffle (1) and the pressure plate (4), at which point the polytetrafluoroethylene plate (3) and the metal plate (2) are firmly bonded; Step 10, clamping the composite metal plate (2) and the polytetrafluoroethylene plate (3) to the top of the workbench, and processing the surface of the polytetrafluoroethylene plate (3) to meet the designed surface finish and dimensional accuracy.

2. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized by: In the step 1, when the surface of the metal plate (2) to be composited is rough-processed, the surface of the metal plate (2) to be composited has a smoothness within 12.

5.

3. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized in that: In the step 2, the surface of the polytetrafluoroethylene plate (3) to be bonded is roughened by sandblasting or manual roughening with an electric tool to roughen the bonding surface of the polytetrafluoroethylene plate, so as to improve the surface adhesion of the bonding surface of the polytetrafluoroethylene plate.

4. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized in that: The specific method for treating the surface to be composited of the polytetrafluoroethylene plate in step 3 is to scrape the polytetrafluoroethylene surfactant onto the roughened surface of the polytetrafluoroethylene plate, scrape again after every 15 to 30 minutes, and scrape 3 to 5 times in total.

5. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized in that: In step 4, anhydrous ethanol is used to clean the surfaces of the metal plate (2) and the polytetrafluoroethylene plate (3) to be composited after being treated, so as to ensure that there is no dust or oily substances on the bonding surfaces to be composited.

6. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized by: In step 5, the YF-6911 glue comprises glue A and glue B. During the preparation process, glue A and glue B are mixed in a weight ratio of 1:1, stirred evenly, and then applied to the surface to be composited of the polytetrafluoroethylene plate (3).

7. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized by: In step 6, E-44 epoxy resin glue and low molecular weight 650 polyamide resin are mixed in a volume ratio of 1:

1.

8. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized by: Steps 5 to 7 should be performed consecutively, with the interval time not exceeding 1 hour.

9. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1 is characterized by: In step 7, during the bonding and pressing process of the metal plate (2) and the polytetrafluoroethylene plate (3), in order to prevent the glue from overflowing during bonding, the stopper (1), the pressure plate (4) or the position in the processed hole that does not need to be bonded is protected by applying butter or dimethyl silicone oil (5) to the position that does not need to be bonded.

10. The metal and non-metal composite plate forming process with high-precision surface requirements according to claim 1, characterized in that: In step 7, if the polytetrafluoroethylene plate (3) needs to be processed with holes, the holes are processed first and then bonded.

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