Oil injector body blank local heating forming process and mold

Abstract

The invention relates to the technical field of oil sprayer bodies, and discloses an oil sprayer body blank local heating forming process and a mold. Step 2, local heating; step 3, closed die forging; step 4, post-treatment; through the local heating forming process of the oil sprayer body blank, shot blasting of the blank is not needed any more, preheating and graphite precoating are not needed either, and the production efficiency is high; only local heating is adopted, the heating time is short, energy is saved, carbon emission can be effectively reduced, and green manufacturing is achieved; local heating is adopted, the lower end of the blank does not deform, and burrs are avoided; through the design of the forming die, closed forming is adopted during forging, a forge piece is free of flash, the material utilization rate is high, automatic forging is easy to achieve, and the die is simple in structure; and meanwhile, through the arrangement of the split structure, the deformation area of the mold can be conveniently and independently replaced, and therefore the production cost of the mold is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fuel injector bodies, in particular to a local heating forming process and a mould for a fuel injector body blank. Background Art

[0002] The injector body is mainly used in high-pressure common rail fuel systems. The injector body blank is mainly formed by vertical closed forging, and some injector body blanks with complex shapes are formed by open forging. Regardless of the method used, the hot forging forming scheme is currently adopted, that is, the cut bar is heated as a whole, and then placed in the mold for forming.

[0003] There are many types of forming dies for the injector body blank in the prior art, but there are still certain defects in use. For example, the high-pressure common rail system injector nozzle blank closed forming process disclosed in CN104028952B has a relatively complicated process. After the raw material is shot blasted, the blank is first preheated, and then pre-coated with graphite and continued to be heated. A specially customized preheating furnace and pre-coated graphite system are required, and the production and equipment maintenance costs are high, and the production cycle is low.

[0004] For another example, CN105195659B discloses a multi-directional closed forging device and process for a special-shaped injector body based on a guide pin. In the disclosed process, the blank is heated by a medium frequency furnace before forging, and the blank still needs to be pre-coated with graphite.

[0005] For another example, CN105290291B discloses a closed pre-forging forming die and process for a special-shaped injector body blank. Although the disclosed process adopts closed pre-forging, the final forging adopts open forging. After the final forging, the flash needs to be cut off, and the material utilization rate is low. The process schemes mentioned in the above three patents all use a medium frequency furnace to heat the blank as a whole before forging. The heating time is long and the production efficiency is low. Therefore, a local heating forming process and die for the injector body blank are proposed. Summary of the invention

[0006] The object of the present invention is to provide a local heating forming process and a die for a fuel injector body blank, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a local heating forming process of a fuel injector body blank, comprising the following steps:

[0008] Step 1: Cutting: The blank is cut with a high-precision circular saw. The diameter of the blank is 0.5-0.7mm smaller than the diameter of the injector body blank rod. The blank length is based on the equal weight principle, that is, the blank weight is equal to the weight of the injector body blank.

[0009] Step 2: Local heating: Use all-solid-state induction heating equipment to locally heat the cut blank. The blank heating length L 加热 It can be calculated based on the weight of the deformation area of ​​the injector body blank, that is,

[0010] L 加热 =M 变形 / ρs

[0011] Among them, M 变形 Refers to the weight of the deformation zone, ρ refers to the density of the steel, s refers to the cross-sectional area of ​​the billet, the local heating temperature of the billet is 1050-1110℃, the end surface of the billet is measured in real time by a temperature measuring instrument, and the heating is stopped when the material temperature reaches the temperature set by the process;

[0012] Step 3, closed die forging, completing the closed die forging of the partially heated blank through a die;

[0013] Step 4: Post-processing: the forged forgings are heat treated, shot blasted, inspected, magnetic particle inspected, eddy current sorted, cleaned, rust-proofed and packaged to complete the production of the injector body.

[0014] Preferably, in the above step 2, the all-solid-state induction heating device includes a heating coil, a fixed component and a flipping and moving component, the heating coil is installed on the front side of the all-solid-state induction heating device, the fixed component is arranged on the front side of the all-solid-state induction heating device and is located on the left side of the heating coil, and the flipping and moving component is arranged on the fixed component.

[0015] Preferably, the above-mentioned fixing assembly includes a mounting plate, a first slide rail and a first slide seat, the mounting plate is mounted on the front side of the all-solid-state induction heating equipment, the first slide rail is fixedly connected to the top of the mounting plate, the first slide seat is slidably connected to the outer side of the first slide rail, a fixed shaft is rotatably connected to the first slide seat, one end of the fixed shaft is fixedly connected to a fixed seat, a placement groove is provided on the top of the fixed seat, a plurality of fixing grooves are provided inside the placement groove, a spring sheet is installed inside the fixing groove, and a driving assembly is provided at one end of the first slide rail at the top of the mounting plate.

[0016] Preferably, the above-mentioned driving assembly includes a support plate and a multi-stage electric push rod, the support plate is fixedly connected to the top of the mounting plate and is located at one end of the first slide rail, the multi-stage electric push rod is installed on one side of the support plate, and the push rod end of the multi-stage electric push rod passes through the support plate and is fixedly connected to one end of the first slide seat.

[0017] Preferably, the above-mentioned flipping and moving assembly includes a second slide rail, a second slide seat and a plurality of teeth, the second slide rail is fixedly connected to the top of the mounting plate and is located on the rear side of the first slide rail, the second slide seat is slidably connected to the outer side of the second slide rail, a plurality of teeth are fixedly connected to the top of the second slide seat, the other end of the fixed shaft is fixedly connected to a gear, the gear is meshingly connected to the outer side of the teeth, a fixed column is fixedly connected to the gear, one end of the second slide seat is fixedly connected to an L-shaped frame, the other end of the top of the second slide seat is fixedly connected to a limiting block, and a guide assembly is provided on the second slide rail.

[0018] Preferably, the above-mentioned guide assembly includes a guide column, a fixed plate and a telescopic spring, the fixed plate is fixedly connected to the top of the second slide rail and one end away from the second slide seat, the guide column movably passes through one side of the fixed plate, one end of the guide column is fixedly connected to one side of the L-shaped frame, and the telescopic spring is movably sleeved on the outer side of the guide column and is located between the fixed plate and the L-shaped frame.

[0019] Preferably, a bracket is installed on the front side of the all-solid-state induction heating device, and the temperature measuring instrument is installed on the bracket.

[0020] A local heating forming die for a fuel injector body blank, the die is applied to the local heating forming process for a fuel injector body blank as described in any one of claims 1 to 7, the die comprises an upper die, a lower die assembly, a cavity and a push rod, the upper die is arranged above the lower die assembly, the cavity is arranged on the lower die assembly, and the push rod is inserted into the interior of the lower die assembly.

[0021] Preferably, the lower mold assembly comprises a first lower mold, the mold cavity is arranged at the top of the first lower mold, and the ejector pin is movably inserted into the inner side of the bottom of the first lower mold.

[0022] Preferably, the above-mentioned lower mold assembly includes a second lower mold and a third lower mold, the second lower mold is arranged at the top end of the third lower mold, the cavity is arranged at the top of the second lower mold, and the ejector pin is movably inserted into the inner side of the bottom of the third lower mold.

[0023] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0024] 1. The present invention adopts the process of local heating and forming the injector body blank, so that the blank no longer needs shot blasting, preheating and pre-coating of graphite, and has high production efficiency; and only local heating is used, the heating time is short, energy is saved, carbon emissions can be effectively reduced, and green manufacturing can be achieved; by using local heating, the lower end of the blank will not be deformed and burrs will not be generated.

[0025] 2. The present invention adopts closed forming during forging through the design of the forming die, so that the forging has no flash, the material utilization rate is high, it is easy to realize automated forging, and the die structure is simple; at the same time, through the setting of the split structure, it is convenient to replace the deformation area of ​​the die separately, thereby reducing the cost of die production.

[0026] 3. The present invention provides a fixed component and a flip movable component, so that during the process of processing the blank, there is no need for manual holding of the blank for heating, thereby reducing the labor intensity of personnel and improving the safety of blank heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the process flow of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the all-solid-state induction heating device of the present invention;

[0030] Figure 3 It is a schematic diagram of the heating coil structure of the present invention;

[0031] Figure 4 It is a schematic diagram of the support structure of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the mounting plate of the present invention;

[0033] Figure 6 It is a schematic diagram of the cross-sectional structure of the fixing seat of the present invention;

[0034] Figure 7 It is a schematic diagram of the forging structure of the present invention;

[0035] Figure 8 It is a schematic diagram of discharging materials from the mold of the present invention;

[0036] Fig. 9 It is a schematic diagram of the die forging molding of the present invention;

[0037] Fig.10 It is a schematic diagram of demoulding the forming forging of the present invention;

[0038] Fig.11 It is a schematic diagram of the structure of the formed forging of the present invention;

[0039] Fig.12It is a schematic structural diagram of the split lower mold assembly of the present invention.

[0040] Explanation of the accompanying drawings: 1. All-solid-state induction heating equipment; 2. Heating coil; 3. Bracket; 4. Thermometer; 51. Mounting plate; 52. First slide rail; 53. First slide seat; 54. Fixed shaft; 55. Fixed seat; 56. Placement slot; 57. Fixed slot; 58. Shrapnel; 59. Support plate; 510. Multi-stage electric push rod; 61. Second slide rail; 62. Second slide seat; 63. Teeth; 64. Gear; 65. Fixed column; 66. L-shaped frame; 67. Guide column; 68. Fixed plate; 69. Telescopic spring; 610. Limit block; 7. Upper mold; 8. First lower mold; 9. Cavity; 10. Push rod; 11. Second lower mold; 12. Third lower mold. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0043] Example 1

[0044] See also Figure 1-2 and Figure 7-11 The present invention provides a technical solution: a local heating forming process for a fuel injector body blank, comprising the following steps:

[0045] Step 1, cutting, the blank is cut with a high-precision circular saw. To prevent warping and burrs on both ends of the blank, the life of the saw blade needs to be controlled. The diameter of the blank is 0.5-0.7mm smaller than the diameter of the injector body blank rod. The length of the blank is based on the equal weight principle, that is, the blank weight is equal to the weight of the injector body blank;

[0046] Step 2: Local heating: Use the all-solid-state induction heating device (1) to locally heat the cut blank. The blank heating length L 加热 It can be calculated based on the weight of the deformation area of ​​the injector body blank, that is,

[0047] L 加热 =M 变形 / ρs

[0048] Among them, M 变形 refers to the weight of the deformation zone, ρ refers to the density of the steel, s refers to the cross-sectional area of ​​the billet, the local heating temperature of the billet is 1050-1110°C, the end surface of the billet is measured in real time by a temperature measuring instrument (4), and the heating is stopped when the material temperature reaches the temperature set by the process;

[0049] Step 3, closed die forging, completing the closed die forging of the partially heated blank through a die;

[0050] Step 4: Post-processing: the forged forgings are heat treated, shot blasted, inspected, magnetic particle inspected, eddy current sorted, cleaned, rust-proofed and packaged to complete the production of the injector body.

[0051] A local heating forming mold for an injector body blank, the mold is applied to the local heating forming process for the injector body blank as described in any one of claims 1 to 7, the mold includes an upper mold 7, a lower mold assembly, a cavity 9 and a push rod 10, the upper mold 7 is arranged above the lower mold assembly, the cavity 9 is arranged on the lower mold assembly, and the push rod 10 is inserted into the interior of the lower mold assembly.

[0052] The lower die assembly includes a first lower die 8, a cavity 9 is arranged at the top of the first lower die 8, and a push rod 10 is movably inserted into the inner side of the bottom of the first lower die 8; during forging, the mold is placed in the cavity 9 of the first lower die 8, and then the upper die 7 moves downward. After the upper die 7 and the first lower die 8 contact, the upper die 7 and the first lower die 8 move together to a set height to complete the closed forging of the injector body blank, and then the upper die 7 is lifted upward, and the push rod 10 pushes the forging out to complete a forging process.

[0053] For the injector body blank, the weight is 703.6g, the rod diameter is Φ23.5mm, and the material is 42CrMoS4. The local heating forming process is:

[0054] Cutting: Select Φ23mm bar material for cutting. According to the principle of equal weight, the length of the cutting blank can be calculated to be 206.7mm. Use a circular saw to cut the bar material. There should be no warping or burrs on both ends of the sawed blank.

[0055] Local heating: Using 3D modeling software, the weight of the deformation zone of the injector body blank can be calculated to be 317g. According to the formula, the heating length L of the blank can be calculated to be 93.2mm. The cut blank is locally heated using a full solid-state induction heating device, with a heating length of 93.2mm and a heating temperature of 1050-1110℃;

[0056] Closed die forging: Before forging begins, the upper die 7 and the first lower die 8 should be preheated, and the die preheating temperature is 150-250°C. Then use a spray gun to spray graphite on the upper die 7 and the first lower die 8. Put the partially heated blank into the cavity 9 of the first lower die 8, and the upper die 7 moves downward. After the upper die 7 and the first lower die 8 come into contact, the upper die 7 and the first lower die 8 move together to the set height to complete the closed forging of the injector body blank. The upper die 7 is lifted upward, and the ejector 10 ejects the forging;

[0057] After the forging process, the forged parts are heat treated, shot blasted, inspected, magnetic particle inspected, eddy current sorted, cleaned, rust-proofed and packaged to complete the production of the injector body.

[0058] Example 2

[0059] See also Fig.12 , which is different from Example 1, is that: the lower mold assembly includes a second lower mold 11 and a third lower mold 12, the second lower mold 11 is arranged at the top of the third lower mold 12, the cavity 9 is arranged at the top of the second lower mold 11, and the ejector pin 10 is movably inserted into the inner side of the bottom of the third lower mold 12; according to the service life of the deformation area of ​​the lower mold assembly is lower than that of the non-deformation area, through the split arrangement of the second lower mold 11 and the third lower mold 12, the second lower mold 11 in the deformation area can be easily replaced separately, thereby reducing the cost of mold production.

[0060] Example 3

[0061] See also Figure 3-6 , which is different from Examples 2 and 3: in step 2, the all-solid-state induction heating device 1 includes a heating coil 2, a fixed component and a flipping and moving component, the heating coil 2 is installed on the front side of the all-solid-state induction heating device 1, the fixed component is arranged on the front side of the all-solid-state induction heating device 1 and is located on the left side of the heating coil 2, and the flipping and moving component is arranged on the fixed component; by inserting one end of the blank into the interior of the heating coil 2, local heating of the blank can be completed.

[0062] By setting up a fixing component, the loading and heating of the blank can be facilitated; the fixing component includes a mounting plate 51, a first slide rail 52 and a first slide seat 53, the mounting plate 51 is installed on the front side of the all-solid-state induction heating device 1, the first slide rail 52 is fixedly connected to the top of the mounting plate 51, the first slide seat 53 is slidably connected to the outer side of the first slide rail 52, a fixing shaft 54 ​​is rotatably connected to the first slide seat 53, one end of the fixing shaft 54 ​​is fixedly connected to a fixing seat 55, a placement groove 56 is provided on the top of the fixing seat 55, a plurality of fixing grooves 57 are provided inside the placement groove 56, a spring piece 58 is installed inside the fixing groove 57, and a driving component is provided at one end of the first slide rail 52 at the top of the mounting plate 51; by inserting the blank into the inner bottom of the placement groove 56 at the top of the fixing seat 55, the blank is deformed by extrusion so that the spring piece 58 is deformed, and the deformed spring piece 58 can fix the blank.

[0063] By setting up a driving component, the blank can be driven to move; the driving component includes a support plate 59 and a multi-stage electric push rod 510, the support plate 59 is fixedly connected to the top of the mounting plate 51 and is located at one end of the first slide rail 52, the multi-stage electric push rod 510 is installed on one side of the support plate 59, the push rod end of the multi-stage electric push rod 510 passes through the support plate 59 and is fixedly connected to one end of the first slide seat 53, the push rod extension of the multi-stage electric push rod 510 is controlled by the switch group, the push rod of the multi-stage electric push rod 510 pushes the first slide seat 53 to move on the first slide rail 52, and the first slide seat 53 drives the fixed seat 55 on the fixed shaft 54 ​​to move, thereby conveying the blank.

[0064] By setting up a flip moving assembly, the upright blank can be rotated to a horizontal state, and one end of the blank can be moved to the inside of the heating coil 2 to facilitate heating of the blank; the flip moving assembly includes a second slide rail 61, a second slide seat 62 and a plurality of teeth 63, the second slide rail 61 is fixedly connected to the top of the mounting plate 51 and is located at the rear side of the first slide rail 52, the second slide seat 62 is slidably connected to the outer side of the second slide rail 61, a plurality of teeth 63 are fixedly connected to the top of the second slide seat 62, the other end of the fixed shaft 54 ​​is fixedly connected to a gear 64, the gear 64 is meshedly connected to the outer side of the teeth 63, a fixed column 65 is fixedly connected to the gear 64, one end of the second slide seat 62 is fixedly connected to an L-shaped frame 66, the other end of the top of the second slide seat 62 is fixedly connected to a limiting block 610, and a guide assembly is provided on the second slide rail 61; through the multi-stage electric push rod 51 0 push rod pushes the first slide 53 to move on the first slide rail 52. During this process, the first slide 53 drives the fixed seat 55 and the gear 64 on the fixed shaft 54 ​​to move. At this time, the gear 64 rotates on the outside of the plurality of teeth 63, so that the gear 64 drives the fixed seat 55 to rotate ninety degrees clockwise through the fixed shaft 54, so that one end of the blank is aligned with the heating coil 2. At the same time, when the gear 64 drives one end of the fixed column 65 to contact the inner side of the L-shaped frame 66, the gear 64 cannot rotate at this time, and the push rod of the multi-stage electric push rod 510 continues to extend, thereby pushing the first slide 53 and the second slide 62 to move on the first slide rail 52 and the second slide rail 61 respectively. At this time, one end of the blank moves to the inside of the heating coil 2, so as to facilitate the heating of the blank, and there is no need to manually hold the blank for heating, thereby reducing the labor intensity of personnel and improving the safety of blank heating.

[0065] By setting up the guide assembly, it is convenient to reset the fixed seat 55, and it is convenient to unload and heat the blank; the guide assembly includes a guide column 67, a fixed plate 68 and a telescopic spring 69, the fixed plate 68 is fixedly connected to the top of the second slide rail 61 away from the end of the second slide seat 62, the guide column 67 movably passes through one side of the fixed plate 68, one end of the guide column 67 is fixedly connected to one side of the L-shaped frame 66, and the telescopic spring 69 is movably sleeved on the outer side of the guide column 67 and is located between the fixed plate 68 and the L-shaped frame 66; when the fixed seat 55 moves, the guide column 67 moves inside the fixed plate 68, and the telescopic spring 69 is compressed by force; when the blank is heated After the heating is completed, the push rod of the multi-stage electric push rod 510 is reset, so that the first slide 53 and the second slide 62 are moved and reset on the first slide rail 52 and the second slide rail 61 respectively. Due to the action of the telescopic spring 69, the L-shaped frame 66 is fitted with the fixed column 65 to ensure that the gear 64 will not rotate, so that one end of the blank moves horizontally out of the interior of the heating coil 2. When the telescopic spring 69 is completely reset, the push rod of the multi-stage electric push rod 510 continues to retract, so that the gear 64 rotates on the outside of several teeth 63, and the gear 64 drives the fixed seat 55 to rotate counterclockwise ninety degrees through the fixed shaft 54, so that the blank is reset to an upright state.

[0066] In order to facilitate real-time observation of the heating temperature of the blank, a bracket 3 is installed on the front side of the all-solid-state induction heating device 1, and a thermometer 4 is installed on the bracket 3. When the blank is heated, one end of the blank is located on one side of the thermometer 4, and the heating temperature of the blank is measured in real time.

[0067] The working principle or structural principle is that when the blank is locally heated, the blank is inserted into the inner bottom of the placement groove 56 at the top of the fixed seat 55, and the blank is squeezed to deform the spring sheet 58, and the deformed spring sheet 58 can fix the blank; then the push rod of the multi-stage electric push rod 510 is controlled to extend through the switch group, and the push rod of the multi-stage electric push rod 510 pushes the first slide seat 53 to move on the first slide rail 52. During this process, the first slide seat 53 drives the fixed seat 55 and the gear 64 on the fixed shaft 54 ​​to move. At this time, the gear 64 rotates on the outside of the plurality of teeth 63, so that the gear 64 drives the fixed seat 55 to rotate clockwise through the fixed shaft 54. Ninety degrees, so that one end of the blank is aligned with the heating coil 2, and at the same time, the gear 64 drives one end of the fixed column 65 to contact the inner side of the L-shaped frame 66. At this time, the gear 64 cannot rotate, and the push rod of the multi-stage electric push rod 510 continues to extend, thereby pushing the first slide 53 and the second slide 62 to move on the first slide rail 52 and the second slide rail 61 respectively. At the same time, the guide column 67 moves inside the fixed plate 68, and the telescopic spring 69 is compressed by the force. At this time, one end of the blank moves to the inside of the heating coil 2, so as to facilitate the heating of the blank, and there is no need to manually hold the blank for heating, thereby reducing the labor intensity of personnel and improving the safety of blank heating.

[0068] The temperature is measured by the thermometer 4, which makes it convenient to observe the heating temperature of the blank in real time. When the specified temperature is reached, the push rod of the multi-stage electric push rod 510 is controlled by the switch group to reset, so that the first slide 53 and the second slide 62 are moved and reset on the first slide rail 52 and the second slide rail 61 respectively. Due to the action of the telescopic spring 69, the L-shaped frame 66 is fitted with the fixed column 65 to ensure that the gear 64 does not rotate, so that one end of the blank moves horizontally out of the interior of the heating coil 2. When the telescopic spring 69 is completely reset, the push rod of the multi-stage electric push rod 510 continues to retract, so that the gear 64 rotates on the outside of several teeth 63. The gear 64 drives the fixed seat 55 to rotate counterclockwise by ninety degrees through the fixed shaft 54, so that the blank is reset to an upright state, thereby facilitating the unloading and loading heating of the blank.

[0069] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. A local heating forming process for a fuel injector body blank, characterized in that: The steps include: Step 1: Cutting: The blank is cut with a high-precision circular saw. The diameter of the blank is 0.5-0.7mm smaller than the diameter of the injector body blank rod. The blank length is based on the equal weight principle, that is, the blank weight is equal to the weight of the injector body blank. Step 2: Local heating: Use the all-solid-state induction heating device (1) to locally heat the cut blank. The blank heating length L 加热 It can be calculated based on the weight of the deformation area of ​​the injector body blank, that is, L 加热 =M 变形 / ρs Among them, M 变形 refers to the weight of the deformation zone, ρ refers to the density of the steel, s refers to the cross-sectional area of ​​the billet, the local heating temperature of the billet is 1050-1110°C, the end surface of the billet is measured in real time by a temperature measuring instrument (4), and the heating is stopped when the material temperature reaches the temperature set by the process; Step 3, closed die forging, completing the closed die forging of the partially heated blank through a die; Step 4: Post-processing: the forged forgings are heat treated, shot blasted, inspected, magnetic particle inspected, eddy current sorted, cleaned, rust-proofed and packaged to complete the production of the injector body.

2. The local heating forming process of a fuel injector body blank according to claim 1, characterized in that: In step 2, the all-solid-state induction heating device (1) comprises a heating coil (2), a fixed component and a flipping and moving component, wherein the heating coil (2) is installed on the front side of the all-solid-state induction heating device (1), the fixed component is arranged on the front side of the all-solid-state induction heating device (1) and is located on the left side of the heating coil (2), and the flipping and moving component is arranged on the fixed component.

3. The local heating forming process of a fuel injector body blank according to claim 2, characterized in that: The fixing assembly comprises a mounting plate (51), a first slide rail (52) and a first slide seat (53); the mounting plate (51) is mounted on the front side of the all-solid-state induction heating device (1); the first slide rail (52) is fixedly connected to the top of the mounting plate (51); the first slide seat (53) is slidably connected to the outer side of the first slide rail (52); a fixing shaft (54) is rotatably connected to the first slide seat (53); one end of the fixing shaft (54) is fixedly connected to a fixing seat (55); a placement groove (56) is provided on the top of the fixing seat (55); a plurality of fixing grooves (57) are provided inside the placement groove (56); a spring sheet (58) is installed inside the fixing groove (57); a driving assembly is provided at one end of the first slide rail (52) at the top of the mounting plate (51).

4. The local heating forming process of a fuel injector body blank according to claim 3 is characterized in that: The driving assembly comprises a support plate (59) and a multi-stage electric push rod (510), wherein the support plate (59) is fixedly connected to the top of the mounting plate (51) and is located at one end of the first slide rail (52), and the multi-stage electric push rod (510) is installed on one side of the support plate (59), and the push rod end of the multi-stage electric push rod (510) passes through the support plate (59) and is fixedly connected to one end of the first slide seat (53).

5. The local heating forming process of a fuel injector body blank according to claim 3 is characterized in that: The flip moving assembly comprises a second slide rail (61), a second slide seat (62) and a plurality of teeth (63); the second slide rail (61) is fixedly connected to the top of the mounting plate (51) and is located at the rear side of the first slide rail (52); the second slide seat (62) is slidably connected to the outer side of the second slide rail (61); a plurality of teeth (63) are fixedly connected to the top of the second slide seat (62); the other end of the fixed shaft (54) is fixedly connected to a gear (64); the gear (64) is meshedly connected to the outer side of the teeth (63); a fixed column (65) is fixedly connected to the gear (64); one end of the second slide seat (62) is fixedly connected to an L-shaped frame (66); the other end of the top of the second slide seat (62) is fixedly connected to a limiting block (610); and a guide assembly is provided on the second slide rail (61).

6. The local heating forming process of a fuel injector body blank according to claim 5, characterized in that: The guide assembly comprises a guide column (67), a fixed plate (68) and a telescopic spring (69); the fixed plate (68) is fixedly connected to the top of the second slide rail (61) at one end away from the second slide seat (62); the guide column (67) movably passes through one side of the fixed plate (68); one end of the guide column (67) is fixedly connected to one side of the L-shaped frame (66); and the telescopic spring (69) is movably sleeved on the outer side of the guide column (67) and is located between the fixed plate (68) and the L-shaped frame (66).

7. The local heating forming process of a fuel injector body blank according to claim 1 is characterized in that: A bracket (3) is installed on the front side of the all-solid-state induction heating device (1), and the temperature measuring instrument (4) is installed on the bracket (3).

8. A local heating forming die for a fuel injector body blank, characterized in that: The mold is applied to the local heating forming process of the injector body blank as described in any one of claims 1 to 7, and the mold comprises an upper mold (7), a lower mold assembly, a cavity (9) and a push rod (10), the upper mold (7) is arranged above the lower mold assembly, the cavity (9) is arranged on the lower mold assembly, and the push rod (10) is inserted into the interior of the lower mold assembly.

9. The local heating forming die for a fuel injector body blank according to claim 8, characterized in that: The lower mold assembly comprises a first lower mold (8), the mold cavity (9) is arranged at the top of the first lower mold (8), and the ejector rod (10) is movably inserted into the inner side of the bottom of the first lower mold (8).

10. The local heating forming die for a fuel injector body blank according to claim 8, characterized in that: The lower mold assembly comprises a second lower mold (11) and a third lower mold (12); the second lower mold (11) is arranged at the top end of the third lower mold (12); the mold cavity (9) is arranged at the top of the second lower mold (11); and the ejector rod (10) is movably inserted into the inner side of the bottom of the third lower mold (12).

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