CN109773111A - The cold heading technique of automobile exhaust pipe connecting flange - Google Patents
The cold heading technique of automobile exhaust pipe connecting flange Download PDFInfo
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- CN109773111A CN109773111A CN201910137704.6A CN201910137704A CN109773111A CN 109773111 A CN109773111 A CN 109773111A CN 201910137704 A CN201910137704 A CN 201910137704A CN 109773111 A CN109773111 A CN 109773111A
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Abstract
The invention discloses a kind of cold heading techniques of automobile exhaust pipe connecting flange, it mainly includes the following steps that, pass sequentially through knife edge die and base at the beginning of the first to the 6th cold upsetting die of car cold-heading obtains connecting flange, base at the beginning of connecting flange is used into flange washing lotion cleaning and dipping again, and is dried in 260~280 DEG C of preheating furnaces；It is moved in annealing furnace again, 4~6h is kept the temperature at 790~850 DEG C, during which apply the high energy pulse electric current of 2min at interval of 45s to connecting flange blank；480 DEG C are cooled to the speed of 110~130 DEG C/min, then is cooled to room temperature using the spray hydrogen type of cooling, then the finished product of connecting flange is obtained by turnery processing.Cold heading technique of the invention effectively improves the production efficiency of connecting flange, improves the utilization rate of steel, reduces manufacturing cost.
Description
Technical field
The present invention relates to technical fields of mechanical processing, are specifically related to a kind of cold-heading work of automobile exhaust pipe connecting flange
Skill.
Background technique
Existing 400 be that stainless steel with preferable heat-resisting quantity and corrosion resistance is widely used in automobile exhaust system, due to
Automobile exhaust system connecting portion must be according to power assembly integral arrangement, so causing connecting flange outer dimension different
Shape part is relatively more.If by realizing flange assembly assembly after the free mounting means of bolt or bolt and flange welding.The former
Assembly influences close because flange aperture and bolt major diameter fit gap in 1mm or so, are be easy to cause to dress flange fitting surface deviation
Seal effect and assembling product presentation quality；The latter is connected by welding manner, professional more demanding to welding operational sequence, and
Rosin joint solder skip in welding position easy to form, causes weld bolt to fall off；The temperature distortion of rear bolt installation site is welded, deflection is not
It is controllable, it is necessary to installation dimension precision to be reached by subsequent trimming, but trimming is likely to result in welding position and takes off
Weldering, this variable is uncontrollable, to cause client's assembling link problem.
And 400 be that the loss of 100 or so machine tool of stainless steel material HRB hardness is excessively high, using bar rapidoprint
Utilization rate is maintained at 25~30%, and stock utilization is relatively low, and material cost is excessive, and manufacturing cost is excessively high.Therefore, one kind is now needed
The manufacturing process of novel connecting flange improves the efficiency and the accuracy of manufacture of product manufacturing, reduces manufacturing cost, improves material
Utilization rate.
Summary of the invention
Technical problem solved by the present invention is reducing manufacturing cost to improve the production efficiency of connecting flange, steel are improved
Utilization rate, provide a kind of cold heading technique of automobile exhaust pipe connecting flange.
The technical scheme is that a kind of cold heading technique of automobile exhaust pipe connecting flange, mainly comprises the steps that
S1: it makes former bar obtain cylinder blank by blanking die；
S2: it is by the first cold upsetting die of car that cylinder blank cold-heading is conical, 0.5~1mm machining allowance is stayed, obtains
One semi-finished blank；
S3: by the second cold upsetting die of car by the cold-heading of the first semi-finished blank at reverse frustoconic, and upper end squeezed out pre-
Shaped flange obtains the second semi-finished blank；
S4: the both ends of the second semi-finished blank are squeezed out by chamfering and upper locating slot and lower fixed by third cold upsetting die of car
Position slot, obtains third semi-finished blank；
S5: it squeezes the lower locating slot of third semi-finished blank to form the first deep hole by the 4th cold upsetting die of car, obtain
4th semi-finished blank；
S5: forming the second deep hole for the upper locating slot backward extrusion of the 4th semi-finished blank by the 5th cold upsetting die of car, only surplus
Lower centre it is a bit of be not penetrated part, obtain the 5th semi-finished blank；
S6: being connected to the part punching press that is not penetrated of the 5th semi-finished blank to form through hole by the 6th cold upsetting die of car, and
Preforming flange cold-heading is formed into flange, lower end squeezes out fillet, stays 0.5~1mm machining allowance, obtains connecting flange just base；
Using cold heading technique, stock utilization be can be improved to 40% or more, greatly improve the utilization rate of material, mechanical performance
Good, since metallic fiber is not switched off, intensity is more more advantageous than machining.
S7: base at the beginning of connecting flange is used flange washing lotion cleaning and dipping 2~3 times, and is dried in 260~280 DEG C of preheating furnaces
It is dry；It is moved in annealing furnace again, 4~6h is kept the temperature at 790~850 DEG C, during which connecting flange blank is applied at interval of 45s
Add the high energy pulse electric current of 2min；480 DEG C are cooled to the speed of 110~130 DEG C/min, then cooling using the spray hydrogen type of cooling
Connecting flange is obtained to room temperature, then by turnery processing.It controls by the hardness of heat treated article blank in HRB80 or so, mentions
The high efficiency of vehicle bits processing, by preheating, the HRB for making annealing treatment and applying high energy pulse current reduction ferritic stainless steel,
Obvious processing effect, controllability is strong, reduces cutter vehicle and considers to obtain loss to be worth doing.
Further, it is stainless steel that the former bar, which is 400,.
Further, the blanking die, the first cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car, the 4th cold heading die
Tool, the 5th cold upsetting die of car and the 6th cold upsetting die of car are coated with coating, and thickness of coating is 30 microns, the preparation method of the coating
Are as follows: nickel salt aqueous solution 1L is taken, and adjusts the pH value of plating solution to 8.3, by 16g nano-diamond powder, 7g nanometer titanium dioxide titanium valve, 3g
It is added in nickel salt aqueous solution after nano graphite powder resonance mixing, and the alkyl phenol polyoxyethylene ether of 1.2g/L is added dropwise, carry out ultrasound
Coating liquid is formed after wave mixing；Then by dry after workpiece alkali cleaning, pickling, the plating 1h under temperature 60 C, then with 2 DEG C/min
Speed is warming up to 76 DEG C, takes out workpiece after standing 2~3min, cleaning, drying obtains coating；The electroplating parameter is constant electricity
Current density 15A/dm2, the nickel salt aqueous solution be the nickel sulfate containing 230~380g/L, 20g~45g/L nickel sulfamic acid and
3g~7g/L oleoyl oxygroup ethanesulfonic acid sodium.Each mold surface layer is coated into coating, improves the accuracy of blank, cold-heading, due to iron element
The reason of body stainless steel hardness, carries out Mold Making and use using the material of traditional non-process, easily occurs precision in cold-heading
Deviation, and the difficulty of cold-heading is larger, therefore, carries out 30 microns of coating to mold surface layer using above-mentioned coating liquid, significantly mentions
The efficiency of cold-heading and the precision and yield rate of connecting flange blank in high cold-heading process.
Further, the gap size between the recessed film of cutting and mill blade of the blanking die is z=(5~15%) d0,
Wherein, d0For blank diameter；The size of cutting edge diameter d on the knife plate of blanking die is the maximum gauge nominal dimension with wire rod,
Its tolerance takes H10.
Further, first cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car, the 4th cold heading die, the 5th cold
Upsetting mould, the 6th cold heading die cavity plate aperture and blank diameter between have certain gap, required for unilateral minimum clearance
For 0.01~0.10mm, the length that cavity plate is entered to gauge or diameter of wire, to wire rod is directlyed proportional.
Further, the parameter of the high energy pulse electric current are as follows: pulse width 30~450 μ s, 55~450Hz of frequency, electricity
Press 30~720V.The application of high energy pulse electric current, the place that ferritic stainless steel can be promoted to anneal are carried out under the range values
Effect is managed, keeps HRB easier to control 80 or so.
Further, the flange washing lotion includes the ingredient of following parts by weight: 0.2~0.5 part of lecithin, alkylolamides
0.8~1.6 part, 0.01~0.03 part of nano ceramic powder, 0.4~0.7 part of sulfamic acid, dimercaptothiodiazole 0.2~0.6,
0.08~0.35 part of tartaric acid, 6~15 parts of dipropylene glycol monomethyl ether, 90~165 parts of distilled water.Lecithin can play stable dispersion
Effect；Stability is high in the solution for alkylolamides, and compatibility is good, and washing effect is good；Nano ceramic powder can play promotion
The effect of each substance dispersion, and in high energy pulse electric current, auxiliary enhances its function and effect；Sulfamic acid can effectively remove gold
Metal surface impurity；Dimercaptothiodiazole can protect metal, inhibit corrosion of metal；Tartaric acid can assist enhancing sulfamic acid
Effect；Dipropylene glycol monomethyl ether can effectively dissolve each solvent, and keep its evenly dispersed, improve the function and effect of flange washing lotion,
Prepared flange washing lotion does not influence to remain under the proportion, and cleaning effect is excellent, and the effect of subsequent heat treatment can be improved.
Further, the connecting flange is connected with bolt by being pressed riveted；The bolt includes that lower part is equipped with screw thread
Fastening assembly, the other side of the threaded fastener assembly are equipped with rivet deformation column, are equipped with shrinkage pool, riveting in the middle part of the rivet deformation column
Connect deformation column outer circle wall be equipped with anti-slop serrations, the threaded fastener assembly by lower part lower turning collar and upper part upper turn
Moving-coil forms, and multiple nail hole is circumferentially at the lower turning collar circumference, the nail hole is equipped with an anti-skid stud, described above to turn
The nail hole position corresponding position of moving-coil and lower turning collar is equipped with an arc groove, pushes anti-skid stud for rotating, wherein screw thread
Fastening assembly path length is greater than rivet deformation column path length.By change bolt and flange connection, so that it is raw to optimize flange assembly
Production. art connects press fitting technique for riveting using bolt with connecting flange, eliminates the assembly of flange drilling and welding sequence, improves
The installation dimension precision of flange bolt component, while having installed threaded fastener assembly additional, fixation at riveting can be further enhanced,
Using easy to operate, manufacturing cost is low, less easy to fall off relative to traditional riveted connection type.
Further, the bolt is using dedicated press fitting annular knurl band tooth bolt, spiral performance class requirement bolt grade
It is 8.8 grades~10.9 grades.
The working principle of above-mentioned connecting flange and bolt press fitting riveted are as follows: riveting die is used, by the rivet deformation of bolt
Column is arranged downward, and the ring flange of connecting flange is placed between riveting die and bolt, bolt pressed downwards, at this moment bolt
Rivet deformation column penetrates ring flange, then proceedes to press downwards, when the rivet deformation column of bolt touches riveting die,
Due to downward active force, so that deformation is realized along the plane of riveting die in the front end of the rivet deformation column of bolt outward, finally
So that the rivet deformation column of bolt is dug around, and it is engaged in ring flange bottom surface by anti-slop serrations, then using spanner etc.
Tool rotates upper turning collar, makes arc groove as anti-skid stud is pressed down against by rotation, penetrates flange panel surface, further enhance
Anti-dropout effect.
The beneficial effects of the present invention are: the design of the technique makes steel utilization ratio be up to 85~95%, productivity is high, molding
Efficiency is higher by tens times or more；Good mechanical property, since metallic fiber is not switched off, intensity is more superior than machining
Much；Using cold heading technique, stock utilization be can be improved to 40% or more, greatly improve the utilization rate of material, subsequent
By the hardness control of heat treated article blank in HRB80 or so, the efficiency of vehicle bits processing is improved；Cold heading technique will directly produce
Product molding stays 0.5~1mm machining allowance, greatly shortening process time close to finished product size；Pass through reasonable control methods again
The blue mounting hole accuracy of manufacture, by change bolt and flange connection, to optimize flange assembly production technology, using bolt
It is pressed technique for riveting with flanged joint, eliminates the assembly of flange drilling and welding sequence, improve the installation of flange bolt component
Dimensional accuracy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of cylinder blank of the invention.
Fig. 2 is the structural schematic diagram of the first semi-finished blank of the invention.
Fig. 3 is the structural schematic diagram of the second semi-finished blank of the invention.
Fig. 4 is the structural schematic diagram of third semi-finished blank of the invention.
Fig. 5 is the structural schematic diagram of the 4th semi-finished blank of the invention.
Fig. 6 is the structural schematic diagram of the 5th semi-finished blank of the invention.
Fig. 7 is the structural schematic diagram of the first base of connecting flange of the invention.
Fig. 8 is the structural schematic diagram of connecting flange finished product of the invention.
Fig. 9 is the overall structure diagram of bolt of the invention, threaded fastener assembly and rivet deformation column.
Figure 10 is lower turning collar overlooking structure diagram of the invention.
Figure 11 is upper turning collar present invention looks up structural representation of the invention.
Figure 12 is lower turning collar and upper turning collar matching relationship partial cutaway view of the invention.
Figure 13 is structural schematic diagram after of the invention press.
Wherein, 1- cylinder blank, the first semi-finished blank of 2-, the second semi-finished blank of 3-, 4- third semi-finished blank,
The 4th semi-finished blank of 5-, the 5th semi-finished blank material of 6-, 7- connecting flange first base, the upper locating slot of 8-, the second deep hole of 81-, 9-
Lower locating slot, the first deep hole of 91-, the preforming flange of 10-, 101- flange, 11- through hole, 12- connecting flange, 13- bolt, 14-
Turning collar under the upper turning collar of threaded fastener assembly, 141-, 1411- arc groove, 142-, 1421- nail hole, 1422- anti-skid stud,
15- rivet deformation column, 151- shrinkage pool, 152- anti-slop serrations.
Specific embodiment
Embodiment 1
As shown in Fig. 1~8, a kind of cold heading technique of automobile exhaust pipe connecting flange is mainly comprised the steps that
S1: former bar is made by blanking die to obtain cylinder blank 1；
S2: it is by the first cold upsetting die of car that 1 cold-heading of cylinder blank is conical, 0.5~1mm machining allowance is stayed, is obtained
First semi-finished blank 2；
S3: by the second cold upsetting die of car by the cold-heading of the first semi-finished blank 2 at reverse frustoconic, and upper end squeezed out pre-
Shaped flange 10 obtains the second semi-finished blank 3；
S4: the both ends of the second semi-finished blank 3 are squeezed out under by chamfering and upper locating slot 8 by third cold upsetting die of car
Locating slot 9 obtains third semi-finished blank 4；
S5: being squeezed the lower locating slot 9 of third semi-finished blank 4 by the 4th cold upsetting die of car and form the first deep hole 91,
Obtain the 4th semi-finished blank 5；
S5: forming the second deep hole 81 for 8 backward extrusion of upper locating slot of the 4th semi-finished blank 5 by the 5th cold upsetting die of car,
What only remaining centre was a bit of is not penetrated part, obtains the 5th semi-finished blank 6；
S6: being connected to the part punching press that is not penetrated of the 5th semi-finished blank 6 to form through hole 11 by the 6th cold upsetting die of car,
And preforming flange cold-heading 10 is formed into flange 101, lower end squeezes out fillet, stays 0.5~1mm machining allowance, obtains connection method
Blue just base 7；Using cold heading technique, stock utilization be can be improved to 40% or more, greatly improve the utilization rate of material, machine
Tool performance is good, and since metallic fiber is not switched off, intensity is more more advantageous than machining.
S7: base 7 at the beginning of connecting flange is used flange washing lotion cleaning and dipping 2 times, and is dried in 260 DEG C of preheating furnaces；Again will
It is moved in annealing furnace, and 4h is kept the temperature at 790 DEG C, during which applies the high energy arteries and veins of 2min at interval of 45s to connecting flange blank
Rush electric current, the parameter of high energy pulse electric current are as follows: pulse width 30 μ s, frequency 55Hz, voltage 30V.It is carried out under the range values
The application of high energy pulse electric current, the treatment effect that ferritic stainless steel can be promoted to anneal make HRB control 82；With 110 DEG C/
The speed of min is cooled to 480 DEG C, then is cooled to room temperature using the spray hydrogen type of cooling, then obtain connecting flange by turnery processing
12.By the hardness control of heat treated article blank in HRB82, the efficiency of vehicle bits processing is improved, by preheating, at annealing
The HRB of high energy pulse current reduction ferritic stainless steel is managed and applies, obvious processing effect, controllability is strong, reduces cutter vehicle
Consider to obtain loss to be worth doing.Flange washing lotion includes the ingredient of following parts by weight: 0.2 part of lecithin, 0.8 part of alkylolamides, and nano-ceramic powder
0.01 part of end, 0.4 part of sulfamic acid, dimercaptothiodiazole 0.2,0.08 part of tartaric acid, 6 parts of dipropylene glycol monomethyl ether, distilled water
90 parts.Lecithin can play the role of stable dispersion；Stability is high in the solution for alkylolamides, and compatibility is good, washing effect
It is good；Nano ceramic powder can play the role of promoting each substance dispersion, and auxiliary enhances it in high energy pulse electric current
Effect；Sulfamic acid can effectively remove metal surface impurity；Dimercaptothiodiazole can protect metal, inhibit corrosion of metal；
Tartaric acid can assist the effect of enhancing sulfamic acid；Dipropylene glycol monomethyl ether can effectively dissolve each solvent, and divide it uniformly
It dissipating, improves the function and effect of flange washing lotion, prepared flange washing lotion does not influence to remain under the proportion, and cleaning effect is excellent, and
And the effect of subsequent heat treatment can be improved.
It is stainless steel that former bar, which is 400,.Blanking die, the first cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car,
Four cold upsetting die of car, the 5th cold upsetting die of car and the 6th cold upsetting die of car are coated with coating, and thickness of coating is 30 microns, the preparation of coating
Method are as follows: take nickel salt aqueous solution 1L, and adjust the pH value of plating solution to 8.3, by 16g nano-diamond powder, 7g nano-titanium dioxide
It is added in nickel salt aqueous solution after powder, the resonance mixing of 3g nano graphite powder, and the alkyl phenol polyoxyethylene ether of 1.2g/L is added dropwise, carried out
Coating liquid is formed after ultrasonic wave mixing；Then by dry after workpiece alkali cleaning, pickling, the plating 1h under temperature 60 C, then with 2
DEG C/min speed is warming up to 76 DEG C, workpiece is taken out after standing 2min, cleaning, drying obtains coating；Electroplating parameter is constant current
Density 15A/dm2, nickel salt aqueous solution is the nickel sulfate containing 230g/L, 20g/L nickel sulfamic acid and 3g/L oleoyl oxygroup second sulphur
Sour sodium.Each mold surface layer is coated into coating, improves blank, the accuracy of cold-heading is adopted due to ferritic stainless steel hardness
Carry out Mold Making and use with the material of traditional non-process, easily occur accuracy error in cold-heading, and the difficulty of cold-heading compared with
Greatly, therefore, the coating for carrying out 30 microns to mold surface layer using above-mentioned coating liquid, significantly improves the effect of cold-heading in cold-heading process
The precision and yield rate of rate and connecting flange blank.Gap size between the recessed film of cutting and mill blade of blanking die is z=
1mm, wherein d0For 10cm；The size of cutting edge diameter d on the knife plate of blanking die is the maximum gauge nominal dimension with wire rod,
Its tolerance takes H10.First cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car, the 4th cold heading die, the 5th cold heading die, the 6th
There is certain gap between the aperture and blank diameter of the cavity plate of cold heading die, required unilateral minimum clearance is 0.05mm.
Embodiment 2
As shown in Fig. 1~8, a kind of cold heading technique of automobile exhaust pipe connecting flange is mainly comprised the steps that
S1: former bar is made by blanking die to obtain cylinder blank 1；
S2: it is by the first cold upsetting die of car that 1 cold-heading of cylinder blank is conical, 0.5~1mm machining allowance is stayed, is obtained
First semi-finished blank 2；
S3: by the second cold upsetting die of car by the cold-heading of the first semi-finished blank 2 at reverse frustoconic, and upper end squeezed out pre-
Shaped flange 10 obtains the second semi-finished blank 3；
S4: the both ends of the second semi-finished blank 3 are squeezed out under by chamfering and upper locating slot 8 by third cold upsetting die of car
Locating slot 9 obtains third semi-finished blank 4；
S5: being squeezed the lower locating slot 9 of third semi-finished blank 4 by the 4th cold upsetting die of car and form the first deep hole 91,
Obtain the 4th semi-finished blank 5；
S5: forming the second deep hole 81 for 8 backward extrusion of upper locating slot of the 4th semi-finished blank 5 by the 5th cold upsetting die of car,
What only remaining centre was a bit of is not penetrated part, obtains the 5th semi-finished blank 6；
S6: being connected to the part punching press that is not penetrated of the 5th semi-finished blank 6 to form through hole 11 by the 6th cold upsetting die of car,
And preforming flange cold-heading 10 is formed into flange 101, lower end squeezes out fillet, stays 0.5~1mm machining allowance, obtains connection method
Blue just base 7；Using cold heading technique, stock utilization be can be improved to 40% or more, greatly improve the utilization rate of material, machine
Tool performance is good, and since metallic fiber is not switched off, intensity is more more advantageous than machining.
S7: base 7 at the beginning of connecting flange is used flange washing lotion cleaning and dipping 3 times, and is dried in 275 DEG C of preheating furnaces；Again will
It is moved in annealing furnace, and 5h is kept the temperature at 830 DEG C, during which applies the high energy arteries and veins of 2min at interval of 45s to connecting flange blank
Rush electric current, the parameter of high energy pulse electric current are as follows: pulse width 320 μ s, frequency 410Hz, voltage 680V.Under the range values into
The application of row high energy pulse electric current, the treatment effect that ferritic stainless steel can be promoted to anneal make HRB control 79；With 120
DEG C/speed of min is cooled to 480 DEG C, then is cooled to room temperature using the spray hydrogen type of cooling, then obtain connection method by turnery processing
Orchid 12.By the hardness control of heat treated article blank in HRB79, the efficiency of vehicle bits processing is improved, by preheating, at annealing
The HRB of high energy pulse current reduction ferritic stainless steel is managed and applies, obvious processing effect, controllability is strong, reduces cutter vehicle
Consider to obtain loss to be worth doing.Flange washing lotion includes the ingredient of following parts by weight: 0.38 part of lecithin, 1.2 parts of alkylolamides, and nano-ceramic powder
0.02 part of end, 0.5 part of sulfamic acid, dimercaptothiodiazole 0.4,0.23 part of tartaric acid, 9 parts of dipropylene glycol monomethyl ether, distilled water
137 parts.Lecithin can play the role of stable dispersion；Stability is high in the solution for alkylolamides, and compatibility is good, washing effect
It is good；Nano ceramic powder can play the role of promoting each substance dispersion, and auxiliary enhances it in high energy pulse electric current
Effect；Sulfamic acid can effectively remove metal surface impurity；Dimercaptothiodiazole can protect metal, inhibit corrosion of metal；
Tartaric acid can assist the effect of enhancing sulfamic acid；Dipropylene glycol monomethyl ether can effectively dissolve each solvent, and divide it uniformly
It dissipating, improves the function and effect of flange washing lotion, prepared flange washing lotion does not influence to remain under the proportion, and cleaning effect is excellent, and
And the effect of subsequent heat treatment can be improved.
It is stainless steel that former bar, which is 400,.Blanking die, the first cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car,
Four cold upsetting die of car, the 5th cold upsetting die of car and the 6th cold upsetting die of car are coated with coating, and thickness of coating is 30 microns, the preparation of coating
Method are as follows: take nickel salt aqueous solution 1L, and adjust the pH value of plating solution to 8.3, by 16g nano-diamond powder, 7g nano-titanium dioxide
It is added in nickel salt aqueous solution after powder, the resonance mixing of 3g nano graphite powder, and the alkyl phenol polyoxyethylene ether of 1.2g/L is added dropwise, carried out
Coating liquid is formed after ultrasonic wave mixing；Then by dry after workpiece alkali cleaning, pickling, the plating 1h under temperature 60 C, then with 2
DEG C/min speed is warming up to 76 DEG C, workpiece is taken out after standing 3min, cleaning, drying obtains coating；Electroplating parameter is constant current
Density 15A/dm2, nickel salt aqueous solution is the nickel sulfate containing 315g/L, 30g/L nickel sulfamic acid and 5g/L oleoyl oxygroup second sulphur
Sour sodium.Each mold surface layer is coated into coating, improves blank, the accuracy of cold-heading is adopted due to ferritic stainless steel hardness
Carry out Mold Making and use with the material of traditional non-process, easily occur accuracy error in cold-heading, and the difficulty of cold-heading compared with
Greatly, therefore, the coating for carrying out 30 microns to mold surface layer using above-mentioned coating liquid, significantly improves the effect of cold-heading in cold-heading process
The precision and yield rate of rate and connecting flange blank.Gap size between the recessed film of cutting and mill blade of blanking die is z=
1mm, wherein d0For 10cm；The size of cutting edge diameter d on the knife plate of blanking die is the maximum gauge nominal dimension with wire rod,
Its tolerance takes H10.First cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car, the 4th cold heading die, the 5th cold heading die, the 6th
There is certain gap between the aperture and blank diameter of the cavity plate of cold heading die, required unilateral minimum clearance is 0.05mm.
Embodiment 3
As shown in Fig. 1~8, a kind of cold heading technique of automobile exhaust pipe connecting flange is mainly comprised the steps that
S1: former bar is made by blanking die to obtain cylinder blank 1；
S2: it is by the first cold upsetting die of car that 1 cold-heading of cylinder blank is conical, 0.5~1mm machining allowance is stayed, is obtained
First semi-finished blank 2；
S3: by the second cold upsetting die of car by the cold-heading of the first semi-finished blank 2 at reverse frustoconic, and upper end squeezed out pre-
Shaped flange 10 obtains the second semi-finished blank 3；
S4: the both ends of the second semi-finished blank 3 are squeezed out under by chamfering and upper locating slot 8 by third cold upsetting die of car
Locating slot 9 obtains third semi-finished blank 4；
S5: being squeezed the lower locating slot 9 of third semi-finished blank 4 by the 4th cold upsetting die of car and form the first deep hole 91,
Obtain the 4th semi-finished blank 5；
S5: forming the second deep hole 81 for 8 backward extrusion of upper locating slot of the 4th semi-finished blank 5 by the 5th cold upsetting die of car,
What only remaining centre was a bit of is not penetrated part, obtains the 5th semi-finished blank 6；
S6: being connected to the part punching press that is not penetrated of the 5th semi-finished blank 6 to form through hole 11 by the 6th cold upsetting die of car,
And preforming flange cold-heading 10 is formed into flange 101, lower end squeezes out fillet, stays 0.5~1mm machining allowance, obtains connection method
Blue just base 7；Using cold heading technique, stock utilization be can be improved to 40% or more, greatly improve the utilization rate of material, machine
Tool performance is good, and since metallic fiber is not switched off, intensity is more more advantageous than machining.
S7: base 7 at the beginning of connecting flange is used flange washing lotion cleaning and dipping 3 times, and is dried in 280 DEG C of preheating furnaces；Again will
It is moved in annealing furnace, and 6h is kept the temperature at 850 DEG C, during which applies the high energy arteries and veins of 2min at interval of 45s to connecting flange blank
Rush electric current, the parameter of high energy pulse electric current are as follows: pulse width 450 μ s, frequency 450Hz, voltage 720V.Under the range values into
The application of row high energy pulse electric current, the treatment effect that ferritic stainless steel can be promoted to anneal make HRB control 80；With 130
DEG C/speed of min is cooled to 480 DEG C, then is cooled to room temperature using the spray hydrogen type of cooling, then obtain connection method by turnery processing
Orchid 12.By the hardness control of heat treated article blank in HRB80, the efficiency of vehicle bits processing is improved, by preheating, at annealing
The HRB of high energy pulse current reduction ferritic stainless steel is managed and applies, obvious processing effect, controllability is strong, reduces cutter vehicle
Consider to obtain loss to be worth doing.Flange washing lotion includes the ingredient of following parts by weight: 0.5 part of lecithin, 1.6 parts of alkylolamides, and nano-ceramic powder
0.03 part of end, 0.7 part of sulfamic acid, dimercaptothiodiazole 0.6,0.35 part of tartaric acid, 15 parts of dipropylene glycol monomethyl ether, distilled water
165 parts.Lecithin can play the role of stable dispersion；Stability is high in the solution for alkylolamides, and compatibility is good, washing effect
It is good；Nano ceramic powder can play the role of promoting each substance dispersion, and auxiliary enhances it in high energy pulse electric current
Effect；Sulfamic acid can effectively remove metal surface impurity；Dimercaptothiodiazole can protect metal, inhibit corrosion of metal；
Tartaric acid can assist the effect of enhancing sulfamic acid；Dipropylene glycol monomethyl ether can effectively dissolve each solvent, and divide it uniformly
It dissipating, improves the function and effect of flange washing lotion, prepared flange washing lotion does not influence to remain under the proportion, and cleaning effect is excellent, and
And the effect of subsequent heat treatment can be improved.
It is stainless steel that former bar, which is 400,.Blanking die, the first cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car,
Four cold upsetting die of car, the 5th cold upsetting die of car and the 6th cold upsetting die of car are coated with coating, and thickness of coating is 30 microns, the preparation of coating
Method are as follows: take nickel salt aqueous solution 1L, and adjust the pH value of plating solution to 8.3, by 16g nano-diamond powder, 7g nano-titanium dioxide
It is added in nickel salt aqueous solution after powder, the resonance mixing of 3g nano graphite powder, and the alkyl phenol polyoxyethylene ether of 1.2g/L is added dropwise, carried out
Coating liquid is formed after ultrasonic wave mixing；Then by dry after workpiece alkali cleaning, pickling, the plating 1h under temperature 60 C, then with 2
DEG C/min speed is warming up to 76 DEG C, workpiece is taken out after standing 3min, cleaning, drying obtains coating；Electroplating parameter is constant current
Density 15A/dm2, nickel salt aqueous solution is the nickel sulfate containing 380g/L, 45g/L nickel sulfamic acid and 7g/L oleoyl oxygroup second sulphur
Sour sodium.Each mold surface layer is coated into coating, improves blank, the accuracy of cold-heading is adopted due to ferritic stainless steel hardness
Carry out Mold Making and use with the material of traditional non-process, easily occur accuracy error in cold-heading, and the difficulty of cold-heading compared with
Greatly, therefore, the coating for carrying out 30 microns to mold surface layer using above-mentioned coating liquid, significantly improves the effect of cold-heading in cold-heading process
The precision and yield rate of rate and connecting flange blank.Gap size between the recessed film of cutting and mill blade of blanking die is z=
1mm, wherein d0For 10cm；The size of cutting edge diameter d on the knife plate of blanking die is the maximum gauge nominal dimension with wire rod,
Its tolerance takes H10.First cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car, the 4th cold heading die, the 5th cold heading die, the 6th
There is certain gap between the aperture and blank diameter of the cavity plate of cold heading die, required unilateral minimum clearance is 0.05mm.
As shown in figure 13, connecting flange 12 is connected with bolt 13 by being pressed riveted；As shown in figure 9, under bolt 13 includes
Portion is equipped with threaded fastener assembly 14, and the other side of threaded fastener assembly 14 is equipped with rivet deformation column 15,15 middle part of rivet deformation column
Equipped with shrinkage pool 151,15 outer circle wall of rivet deformation column is equipped with anti-slop serrations 152, and threaded fastener assembly 14 is by lower turn of lower part
Moving-coil 142 and the upper turning collar 141 of upper part composition, as shown in Figure 10, are circumferentially with multiple nail hole at lower 142 circumference of turning collar
1421, nail hole 1421 is equipped with an anti-skid stud 1422, as shown in Figure 11,12, the nail of upper turning collar 141 and lower turning collar 142
1421 position corresponding position of hole is equipped with an arc groove 1411, pushes anti-skid stud 1422 for rotating, wherein screw threads for fastening group
14 path length of part is greater than 15 path length of rivet deformation column.By change bolt and flange connection, to optimize flange assembly production
Technique connects press fitting technique for riveting using bolt with connecting flange, eliminates the assembly of flange drilling and welding sequence, improves method
The installation dimension precision of blue bolt assembly, while having installed threaded fastener assembly additional, fixation at riveting can be further enhanced, be made
With easy to operate, manufacturing cost is low, less easy to fall off relative to traditional riveted connection type.Bolt uses dedicated press fitting annular knurl
Band tooth bolt, spiral performance class requirement bolt grade are 10.9 grades.
The working principle of connecting flange and bolt press fitting riveted are as follows: riveting die is used, by the rivet deformation column of bolt 13
15 are arranged downward, and the ring flange of connecting flange 12 is placed between riveting die and bolt 13, bolt 13 is pressed downwards, at this moment
The rivet deformation column 15 of bolt 13 penetrates ring flange, then proceedes to press downwards, touches in the rivet deformation column 15 of bolt 13
When riveting die, due to downward active force, so that the front end of the rivet deformation column 15 of bolt 13 is along the flat of riveting die
Realization deformation is faced out, digs the rivet deformation column 15 of bolt 13 around, and is engaged in method by anti-slop serrations 152
Then blue disk bottom surface rotates upper turning collar 141 using tools such as spanners, makes arc groove 1411 with rotation, by anti-skid stud
1422 are pressed down against, and penetrate flange panel surface, further enhance anti-dropout effect.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (9)
1. a kind of cold heading technique of automobile exhaust pipe connecting flange, which is characterized in that mainly comprise the steps that
S1: former bar is made by blanking die to obtain cylinder blank (1)；
S2: it is by the first cold upsetting die of car that cylinder blank (1) cold-heading is conical, obtain the first semi-finished blank (2)；
S3: by the second cold upsetting die of car by the cold-heading of the first semi-finished blank (2) at reverse frustoconic, and by upper end squeeze out it is pre- at
Type flange (10) obtains the second semi-finished blank (3)；
S4: by third cold upsetting die of car by the both ends of the second semi-finished blank (3) squeeze out chamfering and upper locating slot (8) and under
Locating slot (9) obtains third semi-finished blank (4)；
S5: the lower locating slot (9) of third semi-finished blank (4) is squeezed by the 4th cold upsetting die of car and forms the first deep hole
(91), the 4th semi-finished blank (5) is obtained；
S5: upper locating slot (8) backward extrusion of the 4th semi-finished blank (5) is formed by the second deep hole by the 5th cold upsetting die of car
(81), what remaining centre was a bit of is not penetrated part, obtains the 5th semi-finished blank (6)；
S6: being connected to the part punching press that is not penetrated of the 5th semi-finished blank (6) to form through hole (11) by the 6th cold upsetting die of car,
And preforming flange cold-heading (10) is formed into flange (101), lower end squeezes out fillet, stays 0.5~1mm machining allowance, is connected
The first base (7) of acting flange；
S7: base at the beginning of connecting flange (7) are used flange washing lotion cleaning and dipping 2~3 times, and are dried in 260~280 DEG C of preheating furnaces
It is dry；It is moved in annealing furnace again, 4~6h is kept the temperature at 790~850 DEG C, during which connecting flange blank is applied at interval of 45s
Add the high energy pulse electric current of 2min；480 DEG C are cooled to the speed of 110~130 DEG C/min, then cooling using the spray hydrogen type of cooling
Connecting flange (12) are obtained to room temperature, then by turnery processing.
2. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 1, which is characterized in that the original stick
Material is stainless steel for 400.
3. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 1, which is characterized in that the blank
Mould, the first cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car, the 4th cold upsetting die of car, the 5th cold upsetting die of car and the 6th cold-heading
Mold is coated with coating, and thickness of coating is 30 microns, the coating the preparation method comprises the following steps: take nickel salt aqueous solution 1L, and adjust
The pH value of plating solution will be added to 8.3 after 16g nano-diamond powder, 7g nanometer titanium dioxide titanium valve, the resonance mixing of 3g nano graphite powder
In nickel salt aqueous solution, and the alkyl phenol polyoxyethylene ether of 1.2g/L is added dropwise, forms coating liquid after carrying out ultrasonic wave mixing；Then will
Dry, the plating 1h under temperature 60 C after workpiece alkali cleaning, pickling, is then warming up to 76 DEG C with 2 DEG C/min speed, stand 2~
Workpiece is taken out after 3min, cleaning, drying obtains coating；The electroplating parameter is constant current density 15A/dm2, the nickel salt
Aqueous solution is the nickel sulfate containing 230~380g/L, 20g~45g/L nickel sulfamic acid and 3g~7g/L oleoyl oxygroup ethanesulfonic acid
Sodium.
4. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 1, which is characterized in that the blank
Gap size between the recessed film of cutting and mill blade of mould is z=(5~15%) d0, wherein d0For blank diameter；Blanking die
The size of cutting edge diameter d on knife plate, is the maximum gauge nominal dimension with wire rod, and tolerance takes H10.
5. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 1, which is characterized in that described first
Cold upsetting die of car, the second cold upsetting die of car, third cold upsetting die of car, the 4th cold heading die, the 5th cold heading die, the 6th cold heading die cavity plate hole
Have certain gap between diameter and blank diameter, required for unilateral minimum clearance be 0.01~0.10mm, with gauge or diameter of wire,
It is directly proportional to the length that wire rod enters cavity plate.
6. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 1, which is characterized in that the high energy
The parameter of pulse current are as follows: pulse width 30~450 μ s, 55~450Hz of frequency, 30~720V of voltage.
7. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 1, which is characterized in that the nickel salt
The nickel salt contained in aqueous solution is nickel sulfate and nickel sulfamic acid.
8. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 1, which is characterized in that the connection
Flange (12) is connected with bolt (13) by being pressed riveted；The bolt (13) includes that lower part is equipped with threaded fastener assembly (14),
The other side of the threaded fastener assembly (14) is equipped with rivet deformation column (15), and shrinkage pool is equipped in the middle part of the rivet deformation column (15)
(151), rivet deformation column (15) outer circle wall is equipped with anti-slop serrations (152), and the threaded fastener assembly (14) is by lower part
The upper turning collar (141) of lower turning collar (142) and upper part forms, and is circumferentially at lower turning collar (142) circumference multiple
Nail hole (1421), the nail hole (1421) are equipped with an anti-skid stud (1422), the upper turning collar (141) and lower turning collar
(142) nail hole (1421) position corresponding position is equipped with an arc groove (1411), pushes anti-skid stud (1422) for rotating,
Wherein, threaded fastener assembly (14) path length is greater than rivet deformation column (15) path length.
9. a kind of cold heading technique of automobile exhaust pipe connecting flange according to claim 8, which is characterized in that the bolt
Using dedicated press fitting annular knurl band tooth bolt, spiral performance class requirement bolt grade is 8.8 grades~10.9 grades.
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| CN201910137704.6A CN109773111B (en) | 2019-02-25 | 2019-02-25 | Cold heading process of automobile exhaust pipe connecting flange |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112974698A (en) * | 2021-02-07 | 2021-06-18 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Journal die forging method for aeroengine |
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| CN109773111B (en) | 2020-06-23 |
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