CN113878084A - High-pressure fuel pump head cold forging piece, green cold forging process and die thereof - Google Patents
High-pressure fuel pump head cold forging piece, green cold forging process and die thereof Download PDFInfo
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- CN113878084A CN113878084A CN202111142621.XA CN202111142621A CN113878084A CN 113878084 A CN113878084 A CN 113878084A CN 202111142621 A CN202111142621 A CN 202111142621A CN 113878084 A CN113878084 A CN 113878084A
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- pressure fuel
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- 238000010273 cold forging Methods 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000446 fuel Substances 0.000 title claims abstract description 22
- 201000009240 nasopharyngitis Diseases 0.000 title claims description 9
- 239000000314 lubricant Substances 0.000 claims abstract description 29
- 238000005242 forging Methods 0.000 claims abstract description 27
- 238000005422 blasting Methods 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 24
- 238000005461 lubrication Methods 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 230000001788 irregular Effects 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 230000003746 surface roughness Effects 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 229910010037 TiAlN Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims 2
- 238000007127 saponification reaction Methods 0.000 abstract description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 6
- 239000011574 phosphorus Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/14—Ejecting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a cold forging piece of a pump head of a high-pressure fuel pump, a green cold forging process and a die thereof, wherein the cold forging piece comprises an irregular head part and a cylindrical supporting part, and the irregular head part and the cylindrical supporting part are designed to be integrally formed; in the manufacturing process of the cold forging process, the friction between the workpiece and the die is severe during cold forging, so that the surface lubrication treatment is carried out on the workpiece to be formed by using the macromolecular lubricant instead of the phosphorus saponification treatment, and compared with the phosphorus saponification treatment, the macromolecular lubricant is more environment-friendly and does not pollute the environment; in the cold forging process, the process conditions are reasonably set, shot blasting and surface lubrication treatment are carried out on the blank before forging, and the polymer lubricant forms a uniform coating on the surface of the blank before the blank is placed into a cold forging forming die on cold forging equipment for one-step forging forming, so that the forming quality of the pump head is improved, and the problems of galling, rough surface and the like of a product generated after the cold forging of the pump head is formed are solved.
Description
Technical Field
The invention relates to the technical field of high-pressure fuel pump heads, in particular to a cold forging piece for a high-pressure fuel pump head, and an environment-friendly cold forging process and a mold thereof.
Background
The pump head is one of key parts of an automobile high-pressure fuel pump, and is generally obtained by cutting after forging and blank making, the larger the difference between the shape structure of a blank after forging and a finished part is, the more additional materials need to be cut, the more consumed tools and energy consumption are, if a forging blank with a small difference with the finished part needs to be obtained, higher requirements are put on a forging process and a die, cold forging is one of frequently-used forging methods, and forging and blank making of the pump head by applying the forging and blank making method to the pump head are common.
The existing mature surface lubricating method is to carry out phosphorization and saponification treatment on a workpiece, but has pollution to the environment; because the pump head is an irregular stainless steel part and the surface lubrication is carried out by simply adopting a macromolecular lubricant, the forming problems of rough surface, galling and the like of a workpiece appear after cold forging, and the pump head forging blank with expected shape structure and surface quality is difficult to obtain and the reliability of a die is influenced; because the pump head is a non-revolving body, the fillet transition position of a cold forging forming die is easy to cause die cracking due to stress concentration, and the reliability of the die in the forming process is further reduced.
Disclosure of Invention
The invention aims to provide a cold forging piece of a pump head of a high-pressure fuel pump, a green cold forging process and a die thereof, and aims to solve the problems that the phosphorus saponification with surface lubrication in the background technology pollutes the environment, the pump head is only subjected to surface lubrication by adopting a high-molecular lubricant, the forming problems of rough surface, galling and the like of a workpiece occur after cold forging, a pump head forging blank with an expected shape structure and surface quality is difficult to obtain, the reliability of the die is influenced, the pump head is a non-rotary body, the die is easy to crack due to stress concentration at the fillet transition position of a cold forging forming die, and the reliability of the die in the forming process is further reduced.
In order to achieve the purpose, the invention provides the following technical scheme: a cold forging piece for a pump head of a high-pressure fuel pump comprises an irregular head part and a cylindrical supporting part, wherein the irregular head part and the cylindrical supporting part are designed to be integrally formed, and the irregular head part and the cylindrical supporting part are in fillet transition connection;
the irregular head comprises a first end face, a second end face, a first side face, a second side face, a third side face and a fourth side face;
the cylindrical supporting part comprises a supporting bottom surface and a supporting side surface, and the second end surface, the first side surface, the second side surface and the supporting side surface are non-cutting processing surfaces.
Preferably, the first side surface and the second side surface are both designed as curved surfaces, the third side surface and the fourth side surface are designed as planes parallel to each other, and the third side surface and the fourth side surface are transitionally connected by rounded corners of the first side surface and the second side surface.
In addition, the invention also provides a green cold forging process of the cold forging piece of the pump head of the high-pressure fuel pump, which comprises the following steps:
s1, blanking: moving a round bar material to a target position to wait for processing, wherein the round bar material is made of stainless steel;
s2, shot blasting before forging: performing shot blasting treatment on the surface of a stainless steel round bar by using a shot blasting machine to increase the surface roughness of the round bar, wherein the surface roughness of a cylindrical blank after shot blasting is Rz50-Rz 150;
s3, surface lubrication: the surface lubricating lubricant is a macromolecular lubricant with the temperature of 50-90 ℃, the round bar stock is completely soaked into the macromolecular lubricant and then is taken out after 8-12S, and then is dried, the drying temperature is 80-130 ℃, the drying time is 1-3 min, and the macromolecular lubricant forms a uniform coating on the surface of the stock;
s4, cold forging forming and shot blasting after forging: and placing the blank into a cold forging forming die arranged on cold forging equipment for one-step forging forming, wherein the surface temperature of the blank subjected to surface lubrication treatment is not lower than 45 ℃, and a hard alloy coating, such as a TiN, TiCN or TiAlN coating, is prefabricated on the surface of a cavity of a forming block of the cold forging forming die.
Preferably, the polymer lubricant in S3 is a polymer material and deionized water, and the ratio of the polymer material to the deionized water is 1: 1 proportion of aqueous solution:
the cold forging forming die in the S4 comprises an upper cold forging die, a lower cold forging die and a material ejecting assembly, wherein the upper cold forging die comprises an upper die cushion block, an upper die punch is communicated with the inside of the upper die cushion block, the lower cold forging die comprises a lower die core, the lower die core is positioned below the upper die cushion block, a lower die middle die sleeve is movably sleeved on the outer side of the lower die core and the outer side of the upper die cushion block, and a lower die outer die sleeve is movably sleeved on the outer side of the lower die middle die sleeve.
Preferably, the lower die core comprises four first molding blocks and a second molding block, the four first molding blocks are placed in an encircling manner, and the four first molding blocks are mounted on the upper surface of the second molding block.
Preferably, the outer diameter of the four first forming blocks is equal to the outer diameter of the upper die cushion block, the inner diameter of the lower die middle die sleeve is matched with the outer diameter of the upper die cushion block, a first groove and a second groove are sequentially formed in the lower die outer die sleeve, the inner diameter of the first groove is matched with the outer diameter of the lower die middle die sleeve, and the inner diameter of the second groove is matched with the outer diameter of the second forming block.
Preferably, the ejector assembly comprises an ejector rod, one end of the ejector rod is inserted into the lower die core, and the other end of the ejector rod penetrates through the lower die core and is fixedly connected with an ejector base.
Preferably, the outer side of the second molding block is fixedly sleeved with an annular protrusion, the upper surface of the annular protrusion is attached to the lower surface of the lower mold outer mold sleeve, the bottom of the second molding block is provided with an insertion groove matched with the ejection base, and the ejection base is movably inserted into the insertion groove.
Compared with the prior art, the invention has the beneficial effects that:
in the manufacturing process of the cold forging process, the friction between the workpiece and the die is severe during cold forging, so that the surface lubrication treatment is carried out on the workpiece to be formed by using the macromolecular lubricant instead of the phosphorus saponification, and compared with the phosphorus saponification treatment, the macromolecular lubricant is more environment-friendly and does not pollute the environment;
secondly, in the cold forging process, shot blasting and surface lubrication treatment are carried out on the blank before forging by reasonably setting process conditions, and a uniform coating is formed on the surface of the blank by a high-molecular lubricant before the blank is placed into a cold forging forming die on cold forging equipment for one-step forging forming, so that the forming quality of a pump head is improved, and the problems of galling, surface roughness and the like of a product generated after a cold forging piece of the pump head is formed are solved;
and thirdly, the invention not only improves the pump head forming quality, but also improves the reliability of the die in the forming process by the structural design of the cold forging forming die and the prefabrication of the hard alloy coating.
Drawings
FIG. 1 is a schematic structural view of an irregular head according to the present invention;
FIG. 2 is a schematic structural view of another view of the irregular head according to the present invention;
FIG. 3 is a schematic structural view of the upper cold forging die of the present invention;
FIG. 4 is a schematic structural view of the upper cold forging die of the present invention from another perspective;
FIG. 5 is an exploded view of the upper cold forging die of the present invention;
FIG. 6 is a schematic structural view of the upper die punch of the present invention;
FIG. 7 is a schematic diagram of the exploded configuration of the cold forging die of the present invention;
FIG. 8 is an exploded view of the lower cold forging die of the present invention;
FIG. 9 is a schematic structural view of a lower cold forging die of the present invention;
FIG. 10 is a schematic structural view of a lower mold core of the present invention;
FIG. 11 is a schematic cross-sectional view of the outer mold shell of the lower mold of the present invention;
fig. 12 is a schematic structural view of a lower mold outer sleeve of the present invention.
In the figure: 100. an irregular head; 101. a first end face; 102. a second end face; 103. a first side surface; 104. a second side surface; 105. a third side; 106. a fourth side; 200. a cylindrical support portion; 201. a support side; 202. a support floor; 300. cold forging an upper die; 301. an upper die punch; 302. an upper die cushion block; 400. cold forging the lower die; 401. an outer die sleeve of the lower die; 402. a die sleeve in the lower die; 403. a lower die core; 4031. a first molding block; 4032. a second molding block; 4033. an annular projection; 4034. a slot; 404. a first groove; 405. a second groove; 500. a material ejecting component; 501. ejecting the rod; 502. and ejecting the base.
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.
Example 1
Referring to fig. 1-12, the present invention provides a technical solution: a cold forging piece for a pump head of a high-pressure fuel pump comprises an irregular head part 100 and a cylindrical supporting part 200, wherein the irregular head part 100 and the cylindrical supporting part 200 are designed to be integrally formed, and the irregular head part 100 and the cylindrical supporting part 200 are in fillet transition connection;
the irregular head 100 includes a first end face 101, a second end face 102, a first side face 103, a second side face 104, a third side face 105, and a fourth side face 106;
the cylindrical support portion 200 includes a support bottom surface 202 and a support side surface 201, and the second end surface 101, the first side surface 103, the second side surface 104 and the support side surface 201 are all non-machined surfaces.
The first side 103 and the second side 104 are both curved surface designs, the third side 105 and the fourth side 106 are plane designs parallel to each other, and the third side 105 and the fourth side 106 are transitionally connected by a round angle of the first side 103 and the second side 104; the first side surface 103, the second side surface 104, the second end surface 102 and the support side surface 201 are cold-forged surfaces, and are not machined in the process of machining into finished parts.
In addition, the invention also provides a green cold forging process of the cold forging piece of the pump head of the high-pressure fuel pump, which comprises the following steps:
s1, blanking: moving a round bar material to a target position to wait for processing, wherein the round bar material is made of stainless steel;
s2, shot blasting before forging: the shot blasting machine performs shot blasting treatment on the surface of the stainless steel round bar material to increase the surface roughness of the round bar material, the surface roughness of the cylindrical blank after shot blasting is Rz50-Rz150, and the adhesive force of a lubricant in the subsequent surface lubrication step is further improved;
s3, surface lubrication: the surface lubricating lubricant is a high-molecular lubricant with the temperature of 50 ℃, when in surface lubrication, the stainless steel round bar subjected to shot blasting treatment before forging is completely soaked into the high-molecular lubricant and then taken out for drying after 8 seconds, the drying temperature is 80 ℃, and the drying time is 1min, so that the high-molecular lubricant can form a uniform coating on the surface of a blank;
s4, cold forging forming and shot blasting after forging: and (3) placing the blank subjected to surface lubrication treatment into a cold forging forming die arranged on cold forging equipment for one-step forging forming, wherein the surface temperature of the blank subjected to surface lubrication treatment is not lower than 45 ℃, and a hard alloy coating, such as a TiN, TiCN or TiAlN coating, is prefabricated on the surface of a cavity of a forming block of the cold forging forming die.
The macromolecular lubricant in S3 is a macromolecular material and deionized water, and the weight ratio of the macromolecular material to the deionized water is 1: 1 proportion of aqueous solution; the temperature of the aqueous solution was 50 ℃.
When the working principle or the structure principle is used, in the manufacturing process of the cold forging process, because the friction between a workpiece and a die is severe during cold forging, the surface lubrication treatment needs to be carried out on the cold-forged workpiece, and the macromolecular lubricant replaces phosphorus saponification to carry out the surface lubrication treatment on the workpiece needing to be formed, so that the working principle or the structure principle is more environment-friendly and has no environmental pollution; in the cold forging process, shot blasting and surface lubrication treatment are carried out on the blank before forging by reasonably setting process conditions, and before the blank is placed into a cold forging forming die on cold forging equipment for one-step forging forming, a uniform coating is formed on the surface of the blank by a macromolecular lubricant, so that the forming quality of a pump head is improved, and the problems of galling, rough surface and the like of a product generated after a cold forging piece of the pump head is formed are solved; according to the invention, through the structural design of the cold forging forming die and the prefabrication of the hard alloy coating, the forming quality of a pump head is improved, and the reliability of the die in the forming process is improved.
Example 2
This example 2 differs from example 1 in that: a green cold forging process of a cold forging piece of a pump head of a high-pressure fuel pump comprises the following steps:
s1, selecting a stainless steel round bar material to perform sawing blanking on a sawing machine to obtain a cylindrical blank with a certain length;
s2, performing shot blasting treatment on the cylindrical blank in the step 1 on a shot blasting machine, wherein the surface roughness of the cylindrical blank after shot blasting is Rz50-RZ 150;
and S3, directly putting the blanks subjected to shot blasting treatment in the step 2 into a high-molecular lubricant aqueous solution for surface lubrication treatment of the blanks. Wherein the ratio of the high molecular material in the high molecular lubricant aqueous solution to the deionized water is 1: 1, the temperature of the aqueous solution is 90 ℃, and the time of surface lubrication treatment is 12S;
s4, taking out the blank subjected to the surface lubrication treatment in the step 3, and placing the blank on a drying device for drying treatment, wherein the drying temperature is 130 ℃, and the drying time is 1min-3 min.
S5, transferring the blank dried in the step 4 to a cold forging forming die arranged in a nominal pressure 160T oil press by a conveyer belt, and preserving heat of the dried blank in the transferring process, wherein the preserving heat temperature is 75 ℃.
And S6, molding the blank obtained by transferring in the step 5 in the cold forging mold, prefabricating TiN coatings on the cavity surfaces of the first molding block and the second molding block of the cold forging mold, wherein the thickness of the coating is 10 microns, placing the blank in the first molding block 4031 in the lower cold forging mold 400, enabling the upper cold forging mold 300 in the cold forging mold to move downwards to be closed with the lower cold forging mold 400 to form a closed cavity, carrying out extrusion molding on the blank placed on the lower cold forging mold 400, enabling the upper cold forging mold 300 to move upwards after molding, enabling the ejection rod 501 of the ejection assembly 500 to move along with the ejection base 502, ejecting the cold forging molded part of the pump head out of the lower cold forging mold 400, and then taking out the cold forging molded part of the pump head.
S7, placing the pump head cold forging formed piece obtained in the step 6 in a shot blasting machine for shot blasting treatment after forging, and cleaning the lubricant remained on the surface of the pump head cold forging formed piece so as to obtain the high-pressure fuel pump head cold forging piece.
Example 3
In which the same or corresponding components as those in embodiment 2 are denoted by the same reference numerals as those in embodiment 2, and only points different from embodiment 2 will be described below for the sake of convenience, and embodiment 3 differs from embodiment 2 in that: and a cleaning step is added between the step 2 and the step 3, and the blank in the step 2 is cleaned by deionized water with the temperature of 84 ℃.
Example 4
In which the same or corresponding components as those in embodiment 2 are denoted by the same reference numerals as those in embodiment 2, and only the points different from embodiment 2 will be described below for the sake of convenience, and embodiment 4 is different from embodiment 2 in that: in step 6, TiCN coatings are prefabricated on the cavity surfaces of the first forming block 4031 and the second forming block 4032 of the cold forging forming die, and the thickness of each coating is 5 um.
Example 5
In which the same or corresponding components as those in embodiment 3 are denoted by the same reference numerals as those in embodiment 3, and only the points different from embodiment 3 will be described below for the sake of convenience, and embodiment 5 differs from embodiment 3 in that: in step 6, TiCN coatings are prefabricated on the cavity surfaces of the first forming block 4031 and the second forming block 4032 of the cold forging forming die, and the thickness of each coating is 6 um.
Example 6
In which the same or corresponding components as those in embodiment 2 are denoted by the same reference numerals as those in embodiment 2, and only points different from embodiment 2 will be described below for the sake of convenience, and embodiment 6 differs from embodiment 2 in that: in step 6, TiAIN coatings are prefabricated on the cavity surfaces of the first forming block 4031 and the second forming block 4032 of the cold forging forming die, and the thickness of each coating is 7 um.
Example 7
In which the same or corresponding components as those in embodiment 3 are denoted by the same reference numerals as those in embodiment 3, and only the points different from embodiment 3 will be described below for the sake of convenience, and embodiment 7 differs from embodiment 3 in that: in step 6, TiAIN coatings are prefabricated on the cavity surfaces of the first forming block 4031 and the second forming block 4032 of the cold forging forming die, and the thickness of each coating is 8 um.
The cold forging forming die in the S4 comprises an upper cold forging die 300, a lower cold forging die 400 and a material ejecting assembly 500, wherein the upper cold forging die 300 comprises an upper die cushion block 302, an upper die punch 301 is communicated with the interior of the upper die cushion block 302, the lower cold forging die 400 comprises a lower die core 403, the lower die core 403 is positioned below the upper die cushion block 302, a lower die middle die sleeve 402 is movably sleeved on the outer side of the lower die core 403 and the outer side of the upper die cushion block 302, and a lower die outer die sleeve 401 is movably sleeved on the outer side of the lower die middle die sleeve 402.
The lower die mold core 403 comprises four first molding blocks 4031 and a second molding block 4032, the four first molding blocks 4031 are placed in a clasping manner, and the four first molding blocks 4031 are installed on the upper surface of the second molding block 4032; the four first molding blocks 4031 are clasped to form a cavity, and a blank is placed in the cavity.
The outer diameter of the four first forming blocks 4031 in a clasping mode is equal to the outer diameter of the upper die cushion block 302, the inner diameter of a lower die middle die sleeve 402 is matched with the outer diameter of the upper die cushion block 302, a first groove 404 and a second groove 405 are sequentially formed in the lower die outer die sleeve 401, the inner diameter of the first groove 404 is matched with the outer diameter of the lower die middle die sleeve 402, and the inner diameter of the second groove 405 is matched with the outer diameter of the second forming block 4032; when the upper die cushion block 302 is tightly attached to the lower die mold core 403, the upper die cushion block 302 is sleeved with the lower die mold core 403 by the lower die middle mold sleeve 402, and the lower die outer mold sleeve 401 is sleeved outside the lower die middle mold sleeve 402.
The liftout assembly 500 comprises an ejector rod 501, one end of the ejector rod 501 is inserted into the lower mold core 403, and the other end of the ejector rod 501 penetrates through the lower mold core 403 and is fixedly connected with an ejector base 502; after the forming is finished, the upper cold forging die 300 moves upwards, the ejection rod 501 of the ejection assembly 500 moves along with the ejection base 502, and the pump head cold forging formed part is ejected out of the lower cold forging die 400 and then taken out.
An annular bulge 4033 is fixedly sleeved on the outer side of the second molding block 4032, the upper surface of the annular bulge 4033 is attached to the lower surface of the lower die outer die sleeve 401, a slot 4034 matched with the ejection base 502 is formed in the bottom of the second molding block 4032, and the ejection base 502 is movably inserted into the slot 4034; the annular protrusion 4033 blocks the lower mold outer sleeve 401, and the ejection base 502 is movably inserted into the socket 4034 to prevent the second molding block 4032 from being exposed and occupying space.
In summary, the material blank is placed into a cold forging forming die installed on a cold forging apparatus for one-step forging forming, the material blank is placed into the first forming block 4031 in the lower cold forging die 400, the upper cold forging die 300 in the cold forging forming die descends and closes with the lower cold forging die 400 to form a closed cavity, the material blank placed on the lower cold forging die 400 is subjected to extrusion forming, after forming, the upper cold forging die 300 ascends, the ejector rod 501 of the ejector assembly 500 moves along with the ejector base 502, and the pump head cold forging formed part is ejected out of the lower cold forging die 400 and then taken out.
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 (9)
1. The utility model provides a high pressure fuel pump head cold forging which characterized in that: the novel multifunctional chair comprises an irregular head part (100) and a cylindrical supporting part (200), wherein the irregular head part (100) and the cylindrical supporting part (200) are designed to be integrally formed, and the irregular head part (100) and the cylindrical supporting part (200) are in transition connection by adopting a fillet;
the irregular head (100) comprises a first end face (101), a second end face (102), a first side face (103), a second side face (104), a third side face (105) and a fourth side face (106);
the cylindrical support part (200) comprises a support bottom surface (202) and a support side surface (201), and the second end surface (101), the first side surface (103), the second side surface (104) and the support side surface (201) are all non-cutting processing surfaces.
2. The cold forging piece for the pump head of the high-pressure fuel pump according to claim 1, wherein: the first side surface (103) and the second side surface (104) are both in curved surface design, the third side surface (105) and the fourth side surface (106) are in plane design parallel to each other, and the third side surface (105) and the fourth side surface (106) are in transition connection through round corners of the first side surface (103) and the second side surface (104).
3. The green cold forging process of the cold forging piece of the pump head of the high-pressure fuel pump according to any one of claims 1 to 2, characterized by comprising the following steps of: the method comprises the following steps:
s1, blanking: moving a round bar material to a target position to wait for processing, wherein the round bar material is made of stainless steel;
s2, shot blasting before forging: performing shot blasting treatment on the surface of a stainless steel round bar by using a shot blasting machine to increase the surface roughness of the round bar, wherein the surface roughness of a cylindrical blank after shot blasting is Rz50-Rz 150;
s3, surface lubrication: the surface lubricating lubricant is a macromolecular lubricant with the temperature of 50-90 ℃, the round bar stock is completely soaked into the macromolecular lubricant and then is taken out after 8-12S, and then is dried, the drying temperature is 80-130 ℃, the drying time is 1-3 min, and the macromolecular lubricant forms a uniform coating on the surface of the stock;
s4, cold forging forming and shot blasting after forging: and placing the blank into a cold forging forming die arranged on cold forging equipment for one-step forging forming, wherein the surface temperature of the blank subjected to surface lubrication treatment is not lower than 45 ℃, and a hard alloy coating, such as a TiN, TiCN or TiAlN coating, is prefabricated on the surface of a cavity of a forming block of the cold forging forming die.
4. The green cold forging process of the cold forging piece of the pump head of the high-pressure fuel pump as claimed in claim 3, wherein the green cold forging process comprises the following steps of: the high molecular lubricant in S3 is a high molecular material and deionized water, and the weight ratio of the high molecular material to the deionized water is 1: 1 part of water solution.
5. A high pressure fuel pump head cold forging mould according to claim 3, wherein: cold forging forming die in S4 includes cold forging mould (300), cold forging lower mould (400) and liftout subassembly (500), cold forging mould (300) are including last mould cushion (302), the inside intercommunication of going up mould cushion (302) has last mould drift (301), cold forging lower mould (400) are including lower mould mold core (403), lower mould mold core (403) are located go up the below of mould cushion (302), the outside of lower mould mold core (403) with mould cover (402) in the lower mould has been cup jointed in the outside activity of last mould cushion (302), mould cover (401) outside the lower mould has been cup jointed in the activity of the outside of mould cover (402) in the lower mould.
6. The die for the cold forging of the pump head of the high-pressure fuel pump as claimed in claim 5, wherein: the lower die mold core (403) comprises four first molding blocks (4031) and a second molding block (4032), the four first molding blocks (4031) are placed in a clasping mode, and the four first molding blocks (4031) are installed on the upper surface of the second molding block (4032).
7. The die for the cold forging of the pump head of the high-pressure fuel pump as claimed in claim 6, wherein: the outer diameter of the four first forming blocks (4031) in a clasping mode is equal to the outer diameter of the upper die cushion block (302), the inner diameter of the lower die middle die sleeve (402) is matched with the outer diameter of the upper die cushion block (302), a first groove (404) and a second groove (405) are sequentially formed in the lower die outer die sleeve (401), the inner diameter of the first groove (404) is matched with the outer diameter of the lower die middle die sleeve (402), and the inner diameter of the second groove (405) is matched with the outer diameter of the second forming block (4032).
8. The die for the cold forging of the pump head of the high-pressure fuel pump as claimed in claim 6, wherein: the ejection assembly (500) comprises an ejection rod (501), one end of the ejection rod (501) is inserted into the lower die core (403), and the other end of the ejection rod (501) penetrates through the lower die core (403) and is fixedly connected with an ejection base (502).
9. The die for cold forging a pump head of a high pressure fuel pump according to claim 8, wherein: an annular bulge (4033) is fixedly sleeved on the outer side of the second molding block (4032), the upper surface of the annular bulge (4033) is attached to the lower surface of the lower die outer die sleeve (401), an insertion groove (4034) matched with the ejection base (502) is formed in the bottom of the second molding block (4032), and the ejection base (502) is movably inserted into the insertion groove (4034).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111142621.XA CN113878084B (en) | 2021-09-28 | Cold forging piece for pump head of high-pressure fuel pump, green cold forging process and die thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111142621.XA CN113878084B (en) | 2021-09-28 | Cold forging piece for pump head of high-pressure fuel pump, green cold forging process and die thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113878084A true CN113878084A (en) | 2022-01-04 |
| CN113878084B CN113878084B (en) | 2024-06-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA835073A (en) * | 1970-02-24 | E. Cardillo Jerry | Forging method | |
| CN101695806A (en) * | 2009-09-18 | 2010-04-21 | 江苏太平洋精密锻造有限公司 | Process for manufacturing backward gear of automobile gearbox |
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