CN113500356A - Pretreatment process of acid-free high-strength anti-delayed fracture weather-resistant fastener - Google Patents
Pretreatment process of acid-free high-strength anti-delayed fracture weather-resistant fastener Download PDFInfo
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- CN113500356A CN113500356A CN202110788414.5A CN202110788414A CN113500356A CN 113500356 A CN113500356 A CN 113500356A CN 202110788414 A CN202110788414 A CN 202110788414A CN 113500356 A CN113500356 A CN 113500356A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/36—Phosphatising
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Abstract
The invention relates to the technical field of fastener processing, and discloses a pretreatment process of an acid-free high-strength anti-delayed fracture weather-resistant fastener, which comprises the following steps: s1, mechanically peeling; s2, removing rust by a steel brush; s3, sanding with a sand belt; s4, preheating; s5, electrolytic phosphating; s6, drying; s7, coiling; s8, multi-station cold heading forming; s9, thread rolling; s10, heat treatment; s11, surface treatment; s12, checking; the invention abandons the traditional pretreatment mode of soaking high-strength fasteners and changes the pretreatment mode into continuous through type pretreatment, thereby greatly shortening the pretreatment time and avoiding the discharge of acid wastewater.
Description
Technical Field
The invention relates to the technical field of fastener processing, in particular to a pretreatment process of an acid-free high-strength anti-delayed fracture weather-resistant fastener.
Background
The fastener is a general name of a kind of mechanical parts used when two or more parts (or components) are fastened and connected into a whole, and is widely applied to various machines, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical engineering, instruments, supplies and the like, and has the characteristics of various varieties and specifications, different performance and purposes, and extremely high standardization, serialization and universalization degrees
The phosphating is a process of cleaning the surface of the steel wire rod and then carrying out surface treatment by using phosphating solution to form a required phosphating film on the surface of the steel wire rod, namely the steel wire rod phosphating technology. The phosphatized steel wire has uniform poker performance, good toughness and cold processing performance after being drawn.
The existing phosphating method for fastener pretreatment is most widely used in a soaking mode, the phosphating process is long, large-scale production is not facilitated, and a large amount of wastewater and waste residues overflow, pollute the environment and waste resources are caused when phosphating objects are put in and taken out.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the pretreatment process of the acid-free high-strength anti-delayed fracture weather-resistant fastener, which has the advantages of shortening the pretreatment time and no acid wastewater discharge.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the method comprises the following steps:
s1, mechanical husking: putting the raw material into a bending device, bending the raw material by using a roll shaft, wherein part of rust on the surface of the raw material falls off in the bending process, and straightening the bent raw material by using a straightening device;
s2, derusting by a steel brush: putting one end of the straightened raw material in the S1 into an inlet of a steel brush derusting machine, and brushing off the iron rust which is tilted or easily removed on the outer surface of the raw material again by steel brush wheels which are symmetrical on two sides;
s3, belt sanding: placing the raw material processed in the step S2 on an abrasive belt machine, and further removing rust and polishing the outer surface of the raw material in the step S2 by using an abrasive belt;
s4, preheating: preheating the raw material treated by the S3 by water at 90-100 ℃, cleaning impurities on the outer surface, and then drying by hot air;
s5, electrolytic phosphating: directly feeding the preheated raw material S4 into an electrolytic phosphating tank for electrolytic phosphating, wherein an electrolytic phosphating solution is configured in the electrolytic phosphating tank, and the raw material is completely soaked in the solution in the electrolytic phosphating process and has a depth of less than 3cm from the liquid level;
s6, drying: putting the raw material subjected to electrolytic phosphorization of S5 into a tubular dryer for drying;
s7, coiling: putting one end of the raw material dried in the S6 into a coiling machine for coiling;
s8, multi-station cold heading forming: one end of the raw material in the S7 is placed into a feed inlet of a multi-station cold header, the raw material is automatically fed by a feeding mechanism in the multi-station cold header for a certain length, and the raw material is subjected to material breaking, heading, chamfering and reducing in sequence to form a semi-finished product;
s9, thread rolling: putting the semi-finished product in the S8 into a thread ring thread rolling wheel on a thread rolling machine, and then rolling threads through the thread rolling machine;
s10, heat treatment: placing the processed semi-finished product of S9 in a mesh belt furnace for heat treatment, and performing hardness, guaranteed load and wedge load tests after the fastener is subjected to heat treatment;
s11, surface treatment: placing the product of S10 on a hot galvanizing production line for surface treatment;
s12, checking: the product of S11 was subjected to appearance inspection.
Preferably, the hot water passing time in S4 is 2-5 min.
Preferably, the electrolytic phosphating temperature is 60-75 ℃, the electrolytic phosphating solution in the S5 is a mixed solution composed of zinc oxide, phosphoric acid, nitric acid, calcium nitrate, tartaric acid, sodium chlorate, citric acid and water, and each liter of the electrolytic phosphating solution contains the following components: 13 to 18 percent of zinc oxide, 15 to 19 percent of phosphoric acid, 17 to 22 percent of nitric acid, 40 to 46 percent of calcium nitrate, 0.4 to 0.6 percent of tartaric acid, 0.4 to 0.6 percent of sodium chlorate, 0.8 to 1 percent of citric acid and the balance of water.
Preferably, the hardness test in S10 includes the following surface hardness:
1. grinding a small plane at the tail end of the fastener or on any one surface of a hexagonal plane, measuring any three points, and taking the average value HRC of the three points within a standard range;
2. hardness of inner core portion: transversely cutting off the thread section of the fastener, polishing the cross section to be flat, randomly taking three points in the range of a concentric circle of 1/2 fastener radius to perform a core hardness test, and taking the average value HRC of the three points to be in a standard range;
the guaranteed load test in S10 includes the following:
1. when the load is ensured to meet the requirement, the test is not less than 15S, and the moving speed of the chuck is not more than 3 mm/min;
2. after the load is removed, the nut can be screwed out by hand, or the nut is loosened by a spanner and then screwed out by hand;
3. the test is carried out by using the load which is increased by 3 percent compared with the specified value, and if the length after the test load is the same as that before the load, the test load is considered to be qualified;
the wedge load test in S10 includes the following:
1. the bolt material object wedge load test method comprises the steps of taking an inclined washer according to the specification and carrying out a bolt material object wedge load test;
2. when the tensile load meets the standard requirements, the fracture should occur in the shank or unthreaded thread length.
Preferably, the surface treatment in S11 is a galvanization treatment, the surface of the plated layer should be clean and undamaged, the main surface should be smooth and free from nodules, zinc ash and iron exposure, and the surface color and thickness should be uniform.
(III) advantageous effects
Compared with the prior art, the invention provides an acid-free high-strength anti-delayed fracture weather-resistant fastener pretreatment process, which has the following beneficial effects:
1. the pretreatment process of the acid-free high-strength anti-delayed fracture weather-resistant fastener abandons the traditional pretreatment mode of soaking high-strength fasteners and changes the pretreatment mode into continuous through type pretreatment, thereby greatly shortening the pretreatment time and having no acid wastewater discharge.
Detailed Description
To better understand the objects, structure and function of the present invention, a pretreatment process of an acid-free high-strength delayed fracture resistant weather resistant fastener of the present invention will be described in further detail.
Example 1:
a pretreatment process of an acid-free high-strength anti-delayed fracture weather-resistant fastener comprises the following steps:
s1, mechanical husking: putting the raw material into a bending device, bending the raw material by using a roll shaft, wherein part of rust on the surface of the raw material falls off in the bending process, and straightening the bent raw material by using a straightening device;
s2, derusting by a steel brush: putting one end of the straightened raw material in the S1 into an inlet of a steel brush derusting machine, and brushing off the iron rust which is tilted or easily removed on the outer surface of the raw material again by steel brush wheels which are symmetrical on two sides;
s3, belt sanding: placing the raw material processed in the step S2 on an abrasive belt machine, and further removing rust and polishing the outer surface of the raw material in the step S2 by using an abrasive belt;
s4, preheating: preheating and cleaning impurities on the outer surface of the raw material treated by S3 by water at 90 ℃, wherein the time of passing hot water is 2min, and then drying by hot air;
s5, electrolytic phosphating: the raw material preheated by S4 directly enters an electrolytic phosphating tank with the temperature of 60 ℃ for electrolytic phosphating, electrolytic phosphating solution is configured in the electrolytic phosphating tank, wherein the electrolytic phosphating solution is a mixed solution consisting of zinc oxide, phosphoric acid, nitric acid, calcium nitrate, tartaric acid, sodium chlorate, citric acid and water, and each liter of the electrolytic phosphating solution comprises the following components in percentage: 13% of zinc oxide, 19% of phosphoric acid, 17% of nitric acid, 46% of calcium nitrate, 0.4% of tartaric acid, 0.6% of sodium chlorate, 0.8% of citric acid and the balance of water, wherein the raw materials are completely soaked in the solution in the electrolytic phosphating process and have a depth of less than 3cm from the liquid level;
s6, drying: putting the raw material subjected to electrolytic phosphorization of S5 into a tubular dryer for drying;
s7, coiling: putting one end of the raw material dried in the S6 into a coiling machine for coiling;
s8, multi-station cold heading forming: one end of the raw material in the S7 is placed into a feed inlet of a multi-station cold header, the raw material is automatically fed by a feeding mechanism in the multi-station cold header for a certain length, and the raw material is subjected to material breaking, heading, chamfering and reducing in sequence to form a semi-finished product;
s9, thread rolling: putting the semi-finished product in the S8 into a thread ring thread rolling wheel on a thread rolling machine, and then rolling threads through the thread rolling machine;
s10, heat treatment: placing the processed semi-finished product of S9 in a mesh belt furnace for heat treatment, and performing hardness, guaranteed load and wedge load tests after the fastener is subjected to heat treatment;
the hardness test comprises the following surface hardness:
1. grinding a small plane at the tail end of the fastener or on any one surface of a hexagonal plane, measuring any three points, and taking the average value HRC of the three points within a standard range;
2. hardness of inner core portion: transversely cutting off the thread section of the fastener, polishing the cross section to be flat, randomly taking three points in the range of a concentric circle of 1/2 fastener radius to perform a core hardness test, and taking the average value HRC of the three points to be in a standard range;
the guaranteed load test comprises the following contents:
1. when the load is ensured to meet the requirement, the test is not less than 15S, and the moving speed of the chuck is not more than 3 mm/min;
2. after the load is removed, the nut can be screwed out by hand, or the nut is loosened by a spanner and then screwed out by hand;
3. the test is carried out by using the load which is increased by 3 percent compared with the specified value, and if the length after the test load is the same as that before the load, the test load is considered to be qualified;
the wedge load test comprises the following contents:
1. the bolt material object wedge load test method comprises the steps of taking an inclined washer according to the specification and carrying out a bolt material object wedge load test;
2. when the tensile load meets the standard requirements, the fracture should occur in the shank or unthreaded thread length.
S11, surface treatment: placing the product of S10 on a hot galvanizing production line for surface treatment;
s12, checking: the product of S11 was subjected to visual inspection wherein the surface treatment was galvanization, the coating surface was clean and non-marring, the major surface was smooth, free of nodules, zinc dust and iron exposure, and the surface was uniform in color and thickness.
Example 2:
a pretreatment process of an acid-free high-strength anti-delayed fracture weather-resistant fastener comprises the following steps:
s1, mechanical husking: putting the raw material into a bending device, bending the raw material by using a roll shaft, wherein part of rust on the surface of the raw material falls off in the bending process, and straightening the bent raw material by using a straightening device;
s2, derusting by a steel brush: putting one end of the straightened raw material in the S1 into an inlet of a steel brush derusting machine, and brushing off the iron rust which is tilted or easily removed on the outer surface of the raw material again by steel brush wheels which are symmetrical on two sides;
s3, belt sanding: placing the raw material processed in the step S2 on an abrasive belt machine, and further removing rust and polishing the outer surface of the raw material in the step S2 by using an abrasive belt;
s4, preheating: preheating and cleaning impurities on the outer surface of the raw material treated by S3 by using water at 95 ℃, wherein the passing time of the hot water is 3min, and then drying by using hot air;
s5, electrolytic phosphating: the method comprises the following steps of directly feeding the raw material preheated by S4 into an electrolytic phosphating tank at the temperature of 65 ℃ for electrolytic phosphating, wherein an electrolytic phosphating solution is configured in the electrolytic phosphating tank, the electrolytic phosphating solution is a mixed solution consisting of zinc oxide, phosphoric acid, nitric acid, calcium nitrate, tartaric acid, sodium chlorate, citric acid and water, and each liter of the electrolytic phosphating solution comprises the following components in percentage: 18% of zinc oxide, 15% of phosphoric acid, 22% of nitric acid, 40% of calcium nitrate, 0.6% of tartaric acid, 0.4% of sodium chlorate, 1% of citric acid and the balance of water, wherein the raw materials are completely soaked in the solution in the electrolytic phosphating process and have a depth of less than 3cm from the liquid level;
s6, drying: putting the raw material subjected to electrolytic phosphorization of S5 into a tubular dryer for drying;
s7, coiling: putting one end of the raw material dried in the S6 into a coiling machine for coiling;
s8, multi-station cold heading forming: one end of the raw material in the S7 is placed into a feed inlet of a multi-station cold header, the raw material is automatically fed by a feeding mechanism in the multi-station cold header for a certain length, and the raw material is subjected to material breaking, heading, chamfering and reducing in sequence to form a semi-finished product;
s9, thread rolling: putting the semi-finished product in the S8 into a thread ring thread rolling wheel on a thread rolling machine, and then rolling threads through the thread rolling machine;
s10, heat treatment: placing the processed semi-finished product of S9 in a mesh belt furnace for heat treatment, and performing hardness, guaranteed load and wedge load tests after the fastener is subjected to heat treatment;
the hardness test comprises the following surface hardness:
1. grinding a small plane at the tail end of the fastener or on any one surface of a hexagonal plane, measuring any three points, and taking the average value HRC of the three points within a standard range;
2. hardness of inner core portion: transversely cutting off the thread section of the fastener, polishing the cross section to be flat, randomly taking three points in the range of a concentric circle of 1/2 fastener radius to perform a core hardness test, and taking the average value HRC of the three points to be in a standard range;
the guaranteed load test comprises the following contents:
1. when the load is ensured to meet the requirement, the test is not less than 15S, and the moving speed of the chuck is not more than 3 mm/min;
2. after the load is removed, the nut can be screwed out by hand, or the nut is loosened by a spanner and then screwed out by hand;
3. the test is carried out by using the load which is increased by 3 percent compared with the specified value, and if the length after the test load is the same as that before the load, the test load is considered to be qualified;
the wedge load test comprises the following contents:
1. the bolt material object wedge load test method comprises the steps of taking an inclined washer according to the specification and carrying out a bolt material object wedge load test;
2. when the tensile load meets the standard requirements, the fracture should occur in the shank or unthreaded thread length.
S11, surface treatment: placing the product of S10 on a hot galvanizing production line for surface treatment;
s12, checking: the product of S11 was subjected to visual inspection wherein the surface treatment was galvanization, the coating surface was clean and non-marring, the major surface was smooth, free of nodules, zinc dust and iron exposure, and the surface was uniform in color and thickness.
Example 3:
a pretreatment process of an acid-free high-strength anti-delayed fracture weather-resistant fastener comprises the following steps:
s1, mechanical husking: putting the raw material into a bending device, bending the raw material by using a roll shaft, wherein part of rust on the surface of the raw material falls off in the bending process, and straightening the bent raw material by using a straightening device;
s2, derusting by a steel brush: putting one end of the straightened raw material in the S1 into an inlet of a steel brush derusting machine, and brushing off the iron rust which is tilted or easily removed on the outer surface of the raw material again by steel brush wheels which are symmetrical on two sides;
s3, belt sanding: placing the raw material processed in the step S2 on an abrasive belt machine, and further removing rust and polishing the outer surface of the raw material in the step S2 by using an abrasive belt;
s4, preheating: preheating and cleaning impurities on the outer surface of the raw material treated by S3 by water of 100 ℃, wherein the passing time of the hot water is 2min, and then drying by hot air;
s5, electrolytic phosphating: the raw material preheated by S4 directly enters an electrolytic phosphating tank with the temperature of 70 ℃ for electrolytic phosphating, electrolytic phosphating solution is configured in the electrolytic phosphating tank, wherein the electrolytic phosphating solution is a mixed solution consisting of zinc oxide, phosphoric acid, nitric acid, calcium nitrate, tartaric acid, sodium chlorate, citric acid and water, and each liter of the electrolytic phosphating solution comprises the following components in percentage: 15% of zinc oxide, 17% of phosphoric acid, 19% of nitric acid, 43% of calcium nitrate, 0.5% of tartaric acid, 0.5% of sodium chlorate, 0.9% of citric acid and the balance of water, wherein the raw materials are completely soaked in the solution in the electrolytic phosphating process and have a depth of less than 3cm from the liquid level;
s6, drying: putting the raw material subjected to electrolytic phosphorization of S5 into a tubular dryer for drying;
s7, coiling: putting one end of the raw material dried in the S6 into a coiling machine for coiling;
s8, multi-station cold heading forming: one end of the raw material in the S7 is placed into a feed inlet of a multi-station cold header, the raw material is automatically fed by a feeding mechanism in the multi-station cold header for a certain length, and the raw material is subjected to material breaking, heading, chamfering and reducing in sequence to form a semi-finished product;
s9, thread rolling: putting the semi-finished product in the S8 into a thread ring thread rolling wheel on a thread rolling machine, and then rolling threads through the thread rolling machine;
s10, heat treatment: placing the processed semi-finished product of S9 in a mesh belt furnace for heat treatment, and performing hardness, guaranteed load and wedge load tests after the fastener is subjected to heat treatment;
the hardness test comprises the following surface hardness:
1. grinding a small plane at the tail end of the fastener or on any one surface of a hexagonal plane, measuring any three points, and taking the average value HRC of the three points within a standard range;
2. hardness of inner core portion: transversely cutting off the thread section of the fastener, polishing the cross section to be flat, randomly taking three points in the range of a concentric circle of 1/2 fastener radius to perform a core hardness test, and taking the average value HRC of the three points to be in a standard range;
the guaranteed load test comprises the following contents:
1. when the load is ensured to meet the requirement, the test is not less than 15S, and the moving speed of the chuck is not more than 3 mm/min;
2. after the load is removed, the nut can be screwed out by hand, or the nut is loosened by a spanner and then screwed out by hand;
3. the test is carried out by using the load which is increased by 3 percent compared with the specified value, and if the length after the test load is the same as that before the load, the test load is considered to be qualified;
the wedge load test comprises the following contents:
1. the bolt material object wedge load test method comprises the steps of taking an inclined washer according to the specification and carrying out a bolt material object wedge load test;
2. when the tensile load meets the standard requirements, the fracture should occur in the shank or unthreaded thread length.
S11, surface treatment: placing the product of S10 on a hot galvanizing production line for surface treatment;
s12, checking: the product of S11 was subjected to visual inspection wherein the surface treatment was galvanization, the coating surface was clean and non-marring, the major surface was smooth, free of nodules, zinc dust and iron exposure, and the surface was uniform in color and thickness.
The method abandons the traditional soaking type high-strength fastener pretreatment mode, and changes continuous through type pretreatment, thereby greatly shortening the pretreatment time and having no acid wastewater discharge.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A pretreatment process of an acid-free high-strength anti-delayed fracture weather-resistant fastener is characterized by comprising the following steps of: the method comprises the following steps:
s1, mechanical husking: putting the raw material into a bending device, bending the raw material by using a roll shaft, wherein part of rust on the surface of the raw material falls off in the bending process, and straightening the bent raw material by using a straightening device;
s2, derusting by a steel brush: putting one end of the straightened raw material in the S1 into an inlet of a steel brush derusting machine, and brushing off the iron rust which is tilted or easily removed on the outer surface of the raw material again by steel brush wheels which are symmetrical on two sides;
s3, belt sanding: placing the raw material processed in the step S2 on an abrasive belt machine, and further removing rust and polishing the outer surface of the raw material in the step S2 by using an abrasive belt;
s4, preheating: preheating the raw material treated by the S3 by water at 90-100 ℃, cleaning impurities on the outer surface, and then drying by hot air;
s5, electrolytic phosphating: directly feeding the preheated raw material S4 into an electrolytic phosphating tank for electrolytic phosphating, wherein an electrolytic phosphating solution is configured in the electrolytic phosphating tank, and the raw material is completely soaked in the solution in the electrolytic phosphating process and has a depth of less than 3cm from the liquid level;
s6, drying: putting the raw material subjected to electrolytic phosphorization of S5 into a tubular dryer for drying;
s7, coiling: putting one end of the raw material dried in the S6 into a coiling machine for coiling;
s8, multi-station cold heading forming: one end of the raw material in the S7 is placed into a feed inlet of a multi-station cold header, the raw material is automatically fed by a feeding mechanism in the multi-station cold header for a certain length, and the raw material is subjected to material breaking, heading, chamfering and reducing in sequence to form a semi-finished product;
s9, thread rolling: putting the semi-finished product in the S8 into a thread ring thread rolling wheel on a thread rolling machine, and then rolling threads through the thread rolling machine;
s10, heat treatment: placing the processed semi-finished product of S9 in a mesh belt furnace for heat treatment, and performing hardness, guaranteed load and wedge load tests after the fastener is subjected to heat treatment;
s11, surface treatment: placing the product of S10 on a hot galvanizing production line for surface treatment;
s12, checking: the product of S11 was subjected to appearance inspection.
2. The pretreatment process of the acid-free high-strength delayed fracture resistant weather-resistant fastener according to claim 1, wherein the pretreatment process comprises the following steps: and in the step S4, the hot water passing time is 2-5 min.
3. The pretreatment process of the acid-free high-strength delayed fracture resistant weather-resistant fastener according to claim 1, wherein the pretreatment process comprises the following steps: the electrolytic phosphating temperature is 60-75 ℃, the electrolytic phosphating solution in S5 is a mixed solution composed of zinc oxide, phosphoric acid, nitric acid, calcium nitrate, tartaric acid, sodium chlorate, citric acid and water, and each liter of electrolytic phosphating solution comprises the following components in percentage by weight: 13 to 18 percent of zinc oxide, 15 to 19 percent of phosphoric acid, 17 to 22 percent of nitric acid, 40 to 46 percent of calcium nitrate, 0.4 to 0.6 percent of tartaric acid, 0.4 to 0.6 percent of sodium chlorate, 0.8 to 1 percent of citric acid and the balance of water.
4. The pretreatment process of the acid-free high-strength delayed fracture resistant weather-resistant fastener according to claim 1, wherein the pretreatment process comprises the following steps: the hardness test in S10 includes the following surface hardness:
1. grinding a small plane at the tail end of the fastener or on any one surface of a hexagonal plane, measuring any three points, and taking the average value HRC of the three points within a standard range;
2. hardness of inner core portion: transversely cutting off the thread section of the fastener, polishing the cross section to be flat, randomly taking three points in the range of a concentric circle of 1/2 fastener radius to perform a core hardness test, and taking the average value HRC of the three points to be in a standard range;
the guaranteed load test in S10 includes the following:
1. when the load is ensured to meet the requirement, the test is not less than 15S, and the moving speed of the chuck is not more than 3 mm/min;
2. after the load is removed, the nut can be screwed out by hand, or the nut is loosened by a spanner and then screwed out by hand;
3. the test is carried out by using the load which is increased by 3 percent compared with the specified value, and if the length after the test load is the same as that before the load, the test load is considered to be qualified;
the wedge load test in S10 includes the following:
1. the bolt material object wedge load test method comprises the steps of taking an inclined washer according to the specification and carrying out a bolt material object wedge load test;
2. when the tensile load meets the standard requirements, the fracture should occur in the shank or unthreaded thread length.
5. The pretreatment process of the acid-free high-strength delayed fracture resistant weather-resistant fastener according to claim 1, wherein the pretreatment process comprises the following steps: the surface treatment in the step S11 is a galvanization treatment, the surface of the plating layer should be clean and free of damage, the main surface should be smooth and free of nodules, zinc ash and iron exposure, and the surface has uniform color and thickness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110788414.5A CN113500356A (en) | 2021-07-13 | 2021-07-13 | Pretreatment process of acid-free high-strength anti-delayed fracture weather-resistant fastener |
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| CN202110788414.5A CN113500356A (en) | 2021-07-13 | 2021-07-13 | Pretreatment process of acid-free high-strength anti-delayed fracture weather-resistant fastener |
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| CN202110788414.5A Pending CN113500356A (en) | 2021-07-13 | 2021-07-13 | Pretreatment process of acid-free high-strength anti-delayed fracture weather-resistant fastener |
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