CN110695627A - Hot heading processing technology for fastener - Google Patents
Hot heading processing technology for fastener Download PDFInfo
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- CN110695627A CN110695627A CN201911049282.3A CN201911049282A CN110695627A CN 110695627 A CN110695627 A CN 110695627A CN 201911049282 A CN201911049282 A CN 201911049282A CN 110695627 A CN110695627 A CN 110695627A
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Abstract
The invention discloses a fastener hot heading processing technology, which comprises the following steps of S1, manufacturing of base materials: select high strength steel, put into automatic cutout equipment with the billet, lead to automatic cutout equipment and cut steel into a plurality of fastener substrate, the fastener substrate includes nut and lower nut substrate, S2, hot heading nut about: the upper nut and the lower nut base material are heated by a high-frequency heating machine, and the technical field of fastener processing is related. According to the hot heading processing technology of the fastener, raw materials of the fastener are well configured, so that the produced fastener has high strength, corrosion resistance, high temperature resistance and other superior performances, the fastener is well subjected to heat treatment, the mechanical performance of the fastener can be remarkably improved, the fastener is subjected to flaw detection, the quality of the outgoing fastener is guaranteed, the processed fastener can be kept in a stable state for a long time, and the buffering effect can be achieved when the structure is fastened under the action of external force.
Description
Technical Field
The invention relates to the technical field of fastener processing, in particular to a hot heading processing technology for a fastener.
Background
The fastener has very wide application in various fields, wherein a structure which is fixed by threads is the most common, but the fastener can be loosened under the action of various external forces such as vibration and the like, so various influences can be caused by loosening of the fastener, various hidden dangers can be caused by the influences which are more or less serious, the equipment safety is less serious, the life safety of people is threatened, and the quality of the fastener is greatly influenced by the fastener processing technology.
The existing fastener processing technology does not perform good configuration on raw materials of a fastener before the fastener is processed, so that the strength, corrosion resistance and high-temperature resistance of the produced fastener are not ideal, and the fastener is not subjected to good heat treatment during processing, so that the machinery of the fastener is not further promoted, and the fastener is not subjected to flaw detection after production is finished, so that the quality of the fastener after leaving a factory cannot be guaranteed, and the processed fastener cannot be kept in a stable state for a long time.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a hot heading processing technology of a fastener, and solves the problems that the strength, corrosion resistance and high temperature resistance of the conventional fastener are not ideal, the mechanical property is weak, the stable state can not be maintained for a long time, and the production technology is complex.
(II) technical scheme
Based on the technical problems in the background art, the invention provides a hot heading processing technology for a fastener.
The invention provides a hot heading processing technology of a fastener, which is characterized by comprising the following steps:
s1, base material preparation: selecting high-strength steel, putting the steel bar into automatic cutting equipment, and cutting the steel into a plurality of fastener base materials by the automatic cutting equipment, wherein the fastener base materials comprise an upper nut base material and a lower nut base material;
s2, hot upsetting of the upper nut and the lower nut: heating the upper nut and the lower nut base material by a high-frequency heating machine until the surfaces of the upper nut and the lower nut base material are heated to 900-950 ℃, controlling the heating time to be 5-6 seconds, placing the upper nut and the lower nut base material subjected to the hot heading treatment in a hexagonal head forming die, then controlling a piston rod of a hydraulic cylinder to extend out, and driving a punch to impact the upper nut and the lower nut subjected to the hot heading treatment by the piston rod, thereby realizing the outer hexagon machining of the upper nut and the lower nut;
s3, thread machining: manufacturing external threads of an upper nut by using a tapping machine, manufacturing internal threads matched with the external threads of the upper nut by using a lower nut by using the tapping machine, mounting the upper nut and the lower nut after the external threads of the upper nut and the internal threads of the lower nut are manufactured, fixing the upper nut and the lower nut by using a pneumatic fixing mechanism after the mounting is finished, punching through holes on upper and lower nut fasteners by using punching equipment after the fixing is finished, and manufacturing internal threads on the through holes in the upper nut and the lower nut by using the tapping machine to obtain semi-finished products of the upper and lower nut fasteners;
s4, heat treatment: placing the semi-finished products of the upper and lower nut fasteners prepared in the step S3 in a high-temperature heating furnace for heating, placing the heated upper and lower nut fasteners in an organic silicon medium for cooling treatment until the temperature of the metal workpiece is reduced to 350-450 ℃, taking out the metal workpiece and placing the metal workpiece in deionized water for water bath cooling, placing the upper and lower nut fasteners in a tempering furnace for tempering treatment, and cooling the upper and lower nut fasteners to room temperature after tempering treatment;
s5, surface treatment: performing Dacromet treatment on the fastener after the heat treatment, and after the treatment is finished, additionally arranging a positioning spring gasket between an upper nut and a lower nut of the fastener to obtain a finished fastener;
s6, storing: flaw detection is carried out on the finished fasteners, the fasteners which are qualified in detection are boxed, product certification is loaded, after the boxing is finished, the boxes are sealed, and the boxes are placed into a warehouse.
Preferably, the steel material in the step S1 includes the following raw materials in parts by weight: 58-82 parts of iron, 3-8 parts of silicon, 1-3 parts of nickel, 5-9 parts of chromium, 0.5-1.5 parts of titanium, 0.5-1.5 parts of carbon, 0.3-0.8 part of nitrogen, 0.7-1.2 parts of phosphorus, 5-12 parts of molybdenum, 1-3 parts of flame retardant and 1-2 parts of antioxidant.
Preferably, in the step S1, the automatic cutting device is an automatic material pushing and cutting bed, and needs to be fixed by a fixing mechanism during cutting.
Preferably, the tapping machine used in the step S3 of making the external thread of the upper nut and the internal thread of the lower nut is an in-mold tapping machine, the screw nut of the tapping machine is driven by the force of the up-and-down movement of the punch to drive the gear assembly, the gear assembly outputs a strong torque force through an accurate transmission ratio to drive the screw tap to make a rotational movement to complete the tapping operation, and the tapping machine used in the step S3 is a pneumatic tapping machine when making the screws in the through holes of the upper nut and the lower nut.
Preferably, the heating temperature of the high-temperature heating furnace in the step S4 is 1150-1300 ℃, the heating time is controlled to be 10-15min, the tempering temperature is 400-500 ℃, and the tempering time is 15-18 min.
Preferably, the dacromet treatment process in step S5 includes organic solvent degreasing, mechanical blasting, spraying, baking, secondary spraying, baking and drying.
(III) advantageous effects
The invention provides a hot heading processing technology of a fastener. The method has the following beneficial effects: the fastener hot heading processing technology is manufactured by S1 and base materials: selecting high-strength steel, putting the steel bar into automatic cutting equipment, and performing S2 and hot heading on an upper nut and a lower nut: heating the upper nut and the lower nut base material by a high-frequency heating machine, and processing the threads by S3: adopt the tapping machine to make the external screw thread of upper nut, adopt the tapping machine to make the internal thread with the external screw thread looks adaptation of upper nut down, S4, heat treatment: and (3) heating the semi-finished product of the upper and lower nut fasteners prepared in the step S3 in a high-temperature heating furnace, and performing surface treatment in the step S5: performing Dacromet treatment on the fastener after heat treatment to obtain a finished fastener after the treatment is finished, S6, storing: the manufactured fasteners are boxed, product certification is loaded, after the boxing is finished, the boxes are sealed and placed into a warehouse, the raw materials of the fasteners are well configured, the manufactured fasteners have high strength, corrosion resistance, high temperature resistance and other superior performances, the fasteners are subjected to good heat treatment, the mechanical performance of the fasteners can be remarkably improved, the fasteners are subjected to flaw detection, the quality of the outgoing fasteners is guaranteed, the processed fasteners can be kept in a stable state for a long time, positioning springs are added between upper nuts and lower nuts, the relative positions of the upper nuts and the lower nuts can be guaranteed to be stable and not dislocated, a buffering effect can be achieved when the structures are fastened under the action of external force, the bolts are effectively protected from being damaged, and meanwhile, the processing technology is simple and easy to implement and convenient to popularize.
Drawings
FIG. 1 is a table of comparative experimental data statistics of the present invention;
FIG. 2 is a schematic view of the fastener construction of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the embodiment of the present invention provides three technical solutions: a fastener hot heading processing technology specifically comprises the following embodiments:
example 1
S1, base material preparation: select high strength steel, put into automatic cutout equipment with the billet, lead to automatic cutout equipment and cut steel into a plurality of fastener substrate, the fastener substrate includes nut and lower nut substrate, and the steel raw materials includes according to the part by weight: 82 parts of iron, 3 parts of silicon, 1 part of nickel, 5 parts of chromium, 0.5 part of titanium, 0.5 part of carbon, 0.3 part of nitrogen, 0.7 part of phosphorus, 5 parts of molybdenum, 1 part of flame retardant and 1 part of antioxidant, wherein the automatic cutting equipment is an automatic material pushing and cutting bed and needs to be fixed by a fixing mechanism during cutting;
s2, hot upsetting of the upper nut and the lower nut: heating the upper nut and the lower nut base material by a high-frequency heating machine until the surfaces of the upper nut and the lower nut base material are heated to 900-950 ℃, controlling the heating time to be 5-6 seconds, placing the upper nut and the lower nut base material subjected to the hot heading treatment in a hexagonal head forming die, then controlling a piston rod of a hydraulic cylinder to extend out, and driving a punch to impact the upper nut and the lower nut subjected to the hot heading treatment by the piston rod, thereby realizing the outer hexagon machining of the upper nut and the lower nut;
s3, thread machining: the external thread of the upper nut is manufactured by a tapping machine, the lower nut is manufactured by the tapping machine to form an internal thread matched with the external thread of the upper nut, after the external thread of the upper nut and the internal thread of the lower nut are manufactured, the upper nut and the lower nut are installed, after the installation is finished, the upper nut and the lower nut are fixed by a pneumatic fixing mechanism, after the fixation is finished, a punching device is used for punching through holes on upper and lower nut fasteners, the tapping machine is used for manufacturing internal threads on the through holes in the upper nut and the lower nut to obtain semi-finished products of the upper and lower nut fasteners, the tapping machine used for manufacturing the external thread of the upper nut and the internal thread of the lower nut is an in-mold tapping machine, the screw nut of the tapping machine is combined by a force driving gear of a punch moving up and down, a gear set outputs strong torsion force through an accurate transmission ratio to drive a screw tap to perform rotary motion to complete tapping operation, when the screws in, the adopted tapping machine is a pneumatic tapping machine;
s4, heat treatment: placing the semi-finished product of the upper and lower nut fasteners prepared in the S3 in a high-temperature heating furnace for heating, placing the heated upper and lower nut fasteners in an organic silicon medium for cooling treatment until the temperature of the metal workpiece is reduced to 350-;
s5, surface treatment: performing Dacromet treatment on the fastener after the heat treatment, after the treatment is finished, additionally arranging a positioning spring gasket between an upper nut and a lower nut of the fastener, and obtaining a finished fastener after the addition is finished;
s6, storing: flaw detection is carried out on the finished fasteners, the fasteners which are qualified in detection are boxed, product certification is loaded, after the boxing is finished, the boxes are sealed, and the boxes are placed into a warehouse.
Example 2
S1, base material preparation: select high strength steel, put into automatic cutout equipment with the billet, lead to automatic cutout equipment and cut steel into a plurality of fastener substrate, the fastener substrate includes nut and lower nut substrate, and the steel raw materials includes according to the part by weight: 58 parts of iron, 8 parts of silicon, 3 parts of nickel, 9 parts of chromium, 1.5 parts of titanium, 1.5 parts of carbon, 0.8 part of nitrogen, 1.2 parts of phosphorus, 12 parts of flame retardant, 3 parts of flame retardant and 2 parts of antioxidation, wherein the automatic cutting equipment is an automatic material pushing and cutting bed, and is fixed by a fixing mechanism during cutting;
s2, hot upsetting of the upper nut and the lower nut: heating the upper nut and the lower nut base material by a high-frequency heating machine until the surfaces of the upper nut and the lower nut base material are heated to 900 ℃, controlling the heating time to be 5 seconds, placing the upper nut and the lower nut base material subjected to the hot heading treatment in a hexagonal head forming die, then controlling a piston rod of a hydraulic cylinder to extend out, and driving a punch to impact the upper nut and the lower nut subjected to the hot heading treatment by the piston rod, so that the upper nut and the lower nut are processed into outer hexagons;
s3, thread machining: the external thread of the upper nut is manufactured by a tapping machine, the lower nut is manufactured by the tapping machine to form an internal thread matched with the external thread of the upper nut, after the external thread of the upper nut and the internal thread of the lower nut are manufactured, the upper nut and the lower nut are installed, after the installation is finished, the upper nut and the lower nut are fixed by a pneumatic fixing mechanism, after the fixation is finished, a punching device is used for punching through holes on upper and lower nut fasteners, the tapping machine is used for manufacturing internal threads on the through holes in the upper nut and the lower nut to obtain semi-finished products of the upper and lower nut fasteners, the tapping machine used for manufacturing the external thread of the upper nut and the internal thread of the lower nut is an in-mold tapping machine, the screw nut of the tapping machine is combined by a force driving gear of a punch moving up and down, a gear set outputs strong torsion force through an accurate transmission ratio to drive a screw tap to perform rotary motion to complete tapping operation, when the screws in, the adopted tapping machine is a pneumatic tapping machine;
s4, heat treatment: placing the semi-finished products of the upper and lower nut fasteners prepared in the step S3 in a high-temperature heating furnace for heating, placing the heated upper and lower nut fasteners in an organic silicon medium for cooling treatment until the temperature of the metal workpiece is reduced to 350 ℃, taking out the metal workpiece and placing the metal workpiece into deionized water for water bath cooling, placing the upper and lower nut fasteners in a tempering furnace for tempering treatment, cooling the upper and lower nut fasteners to room temperature after tempering treatment, controlling the heating temperature of the high-temperature heating furnace to 1150 ℃ for 10min, controlling the tempering temperature to 400 ℃ and the tempering time to 15 min;
s5, surface treatment: performing Dacromet treatment on the fastener after the heat treatment, after the treatment is finished, additionally arranging a positioning spring gasket between an upper nut and a lower nut of the fastener, and obtaining a finished fastener after the addition is finished;
s6, storing: flaw detection is carried out on the finished fasteners, the fasteners which are qualified in detection are boxed, product certification is loaded, after the boxing is finished, the boxes are sealed, and the boxes are placed into a warehouse.
Example 3
S1, base material preparation: select high strength steel, put into automatic cutout equipment with the billet, lead to automatic cutout equipment and cut steel into a plurality of fastener substrate, the fastener substrate includes nut and lower nut substrate, and the steel raw materials includes according to the part by weight: 10 parts of iron, 6 parts of silicon, 2 parts of nickel, 7 parts of chromium, 1 part of titanium, 1 part of carbon, 0.5 part of nitrogen, 1 part of phosphorus, 8 parts of molybdenum, 2 parts of a flame retardant and 1.5 parts of an antioxidant, wherein the automatic cutting equipment is an automatic material pushing and cutting bed and needs to be fixed by a fixing mechanism during cutting;
s2, hot upsetting of the upper nut and the lower nut: heating the upper nut and the lower nut base material by a high-frequency heating machine until the surfaces of the upper nut and the lower nut base material are heated to 925 ℃, controlling the heating time to be 5.5 seconds, placing the upper nut and the lower nut base material subjected to the hot heading treatment in a hexagonal head forming die, then controlling a piston rod of a hydraulic cylinder to extend out, and driving a punch to impact the upper nut and the lower nut subjected to the hot heading treatment by the piston rod, so that the upper nut and the lower nut are processed into outer hexagons;
s3, thread machining: the external thread of the upper nut is manufactured by a tapping machine, the lower nut is manufactured by the tapping machine to form an internal thread matched with the external thread of the upper nut, after the external thread of the upper nut and the internal thread of the lower nut are manufactured, the upper nut and the lower nut are installed, after the installation is finished, the upper nut and the lower nut are fixed by a pneumatic fixing mechanism, after the fixation is finished, a punching device is used for punching through holes on upper and lower nut fasteners, the tapping machine is used for manufacturing internal threads on the through holes in the upper nut and the lower nut to obtain semi-finished products of the upper and lower nut fasteners, the tapping machine used for manufacturing the external thread of the upper nut and the internal thread of the lower nut is an in-mold tapping machine, the screw nut of the tapping machine is combined by a force driving gear of a punch moving up and down, a gear set outputs strong torsion force through an accurate transmission ratio to drive a screw tap to perform rotary motion to complete tapping operation, when the screws in, the adopted tapping machine is a pneumatic tapping machine;
s4, heat treatment: placing the semi-finished products of the upper and lower nut fasteners prepared in the step S3 in a high-temperature heating furnace for heating, placing the heated upper and lower nut fasteners in an organic silicon medium for cooling treatment until the temperature of the metal workpiece is reduced to 400 ℃, taking out the metal workpiece and placing the metal workpiece in deionized water for water bath cooling, placing the upper and lower nut fasteners in a tempering furnace for tempering treatment, cooling the upper and lower nut fasteners to room temperature after tempering treatment, controlling the heating temperature of the high-temperature heating furnace to be 1200 ℃, controlling the heating time to be 12min, controlling the tempering temperature to be 450 ℃ and the tempering time to be 17 min;
s5, surface treatment: performing Dacromet treatment on the fastener after the heat treatment, after the treatment is finished, additionally arranging a positioning spring gasket between an upper nut and a lower nut of the fastener, and obtaining a finished fastener after the addition is finished;
s6, storing: flaw detection is carried out on the finished fasteners, the fasteners which are qualified in detection are boxed, product certification is loaded, after the boxing is finished, the boxes are sealed, and the boxes are placed into a warehouse.
Comparative experiment
A certain fastener manufacturer respectively adopts the processing technology of the embodiment 1 to 3 and the common processing technology to produce fasteners, each fastener produces one hundred pieces, after the production is finished, the yield strength of the fastener processed by the processing technology of the embodiment 1 is 1000Mpa, the yield strength of the fastener processed by the processing technology of the embodiment 2 is 1050Mpa, the yield strength of the fastener processed by the processing technology of the embodiment 3 is 1100Mpa, the yield strength of the fastener processed by the common processing technology is 600Mpa, the fastener processed by the processing technology of the embodiment 1 can be normally used at the high temperature of 400 ℃, the fastener processed by the processing technology of the embodiment 2 can be normally used at the high temperature of 450 ℃, the fastener processed by the processing technology of the embodiment 3 can be normally used at the high temperature of 500 ℃, the fastener processed by the common processing technology can be normally used at the high temperature of 350 ℃, the qualification rate of the fastener produced by the processing technology of the embodiment 1-3 is 99 percent, and the qualification rate of the fastener produced by the common processing technology is 85 percent.
In summary, the fastener made in example 3 has the best strength and high temperature resistance, i.e., the fastener hot heading process in example 3 is the best.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The hot heading processing technology of the fastener is characterized by comprising the following steps:
s1, base material preparation: selecting high-strength steel, putting the steel bar into automatic cutting equipment, and cutting the steel into a plurality of fastener base materials by the automatic cutting equipment, wherein the fastener base materials comprise an upper nut base material and a lower nut base material;
s2, hot upsetting of the upper nut and the lower nut: heating the upper nut and the lower nut base material by a high-frequency heating machine until the surfaces of the upper nut and the lower nut base material are heated to 900-950 ℃, controlling the heating time to be 5-6 seconds, placing the upper nut and the lower nut base material subjected to the hot heading treatment in a hexagonal head forming die, then controlling a piston rod of a hydraulic cylinder to extend out, and driving a punch to impact the upper nut and the lower nut subjected to the hot heading treatment by the piston rod, thereby realizing the outer hexagon machining of the upper nut and the lower nut;
s3, thread machining: manufacturing external threads of an upper nut by using a tapping machine, manufacturing internal threads matched with the external threads of the upper nut by using a lower nut by using the tapping machine, mounting the upper nut and the lower nut after the external threads of the upper nut and the internal threads of the lower nut are manufactured, fixing the upper nut and the lower nut by using a pneumatic fixing mechanism after the mounting is finished, punching through holes on upper and lower nut fasteners by using punching equipment after the fixing is finished, and manufacturing internal threads on the through holes in the upper nut and the lower nut by using the tapping machine to obtain semi-finished products of the upper and lower nut fasteners;
s4, heat treatment: placing the semi-finished products of the upper and lower nut fasteners prepared in the step S3 in a high-temperature heating furnace for heating, placing the heated upper and lower nut fasteners in an organic silicon medium for cooling treatment until the temperature of the metal workpiece is reduced to 350-450 ℃, taking out the metal workpiece and placing the metal workpiece in deionized water for water bath cooling, placing the upper and lower nut fasteners in a tempering furnace for tempering treatment, and cooling the upper and lower nut fasteners to room temperature after tempering treatment;
s5, surface treatment: performing Dacromet treatment on the fastener after the heat treatment, and after the treatment is finished, additionally arranging a positioning spring gasket between an upper nut and a lower nut of the fastener to obtain a finished fastener;
s6, storing: flaw detection is carried out on the finished fasteners, the fasteners which are qualified in detection are boxed, product certification is loaded, after the boxing is finished, the boxes are sealed, and the boxes are placed into a warehouse.
2. The fastener hot-heading machining process according to claim 1, characterized in that: the steel material in the step S1 comprises the following raw materials in parts by weight: 58-82 parts of iron, 3-8 parts of silicon, 1-3 parts of nickel, 5-9 parts of chromium, 0.5-1.5 parts of titanium, 0.5-1.5 parts of carbon, 0.3-0.8 part of nitrogen, 0.7-1.2 parts of phosphorus, 5-12 parts of molybdenum, 1-3 parts of flame retardant and 1-2 parts of antioxidant.
3. The fastener hot-heading machining process according to claim 1, characterized in that: and in the step S1, the automatic cutting equipment is an automatic material pushing and cutting bed, and is fixed by a fixing mechanism during cutting.
4. The fastener hot-heading machining process according to claim 1, characterized in that: and S3, the tapping machine adopted when the external thread of the upper nut and the internal thread of the lower nut are manufactured is an in-mold tapping machine, the screw nut of the tapping machine is driven by the force of the up-and-down movement of the punch to be combined with the gear, the gear set outputs strong torque force through accurate transmission ratio to drive the screw tap to do rotary motion to complete tapping operation, and the tapping machine adopted when the screws in the through holes of the upper nut and the lower nut are manufactured is a pneumatic tapping machine.
5. The fastener hot-heading machining process according to claim 1, characterized in that: the heating temperature of the high-temperature heating furnace in the step S4 is 1150-1300 ℃, the heating time is controlled to be 10-15min, the tempering temperature is 400-500 ℃, and the tempering time is 15-18 min.
6. The fastener hot-heading machining process according to claim 1, characterized in that: the Dacromet treatment process in the step S5 comprises organic solvent oil removal, mechanical shot blasting, spraying, baking, secondary spraying, baking and drying.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111575749A (en) * | 2020-05-19 | 2020-08-25 | 苏州联桓汽车紧固件有限公司 | Surface coating treatment process of high-strength fastener |
| CN112359192A (en) * | 2020-10-26 | 2021-02-12 | 太仓太标汽车部件有限公司 | Heat treatment process of high-strength corrosion-resistant bolt |
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