Oil sprayer body and machining method of stepped deep hole and spherical bottom face of oil sprayer body

Abstract

The invention relates to an oil sprayer body and a machining method for a stepped deep hole and a spherical bottom face of the oil sprayer body. The machining method comprises the following steps: pre-drilling: fixing the oil sprayer body on a machining center, and drilling a blind hole by adopting a drill bit; pre-boring: boring a blind hole; drilling a deep hole: taking the blind hole as a guide, adopting a gun drill to enter a second preset depth, starting inner cooling, increasing the rotating speed and the feeding amount of the gun drill, drilling to a third preset depth, retracting the tool, closing the inner cooling, and withdrawing the gun drill; forming counter bores: processing spherical bottom surfaces at the bottoms of the blind holes by adopting a spherical counter bit by taking the blind holes as guidance; hole expanding and boring are conducted on the hole, and the depth is made to be the fifth preset depth; and chambering: chambering with a gun drill by taking the hole as a guide to obtain the fuel injector body. The invention further provides the oil sprayer body obtained through the machining method. The machining center solves the problems that when an existing machining center is used for machining a stepped deep hole and a spherical bottom face of an oil injector body, the coaxiality is poor, and the roughness cannot meet the product requirement.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a method for processing a fuel injector body and a stepped deep hole and a spherical bottom surface thereof. Background Art

[0002] In the field of modern mechanical processing, especially when machining stepped deep holes and spherical bottom surfaces with a depth exceeding 20 times the diameter on machining centers, two main methods are usually used. One method is to drill the large stepped deep holes first, and then use the drill sleeve to further process the small holes by manual clamping until the depth required by the process is reached and the spherical bottom surface is countersunk. Although this method can effectively reduce the breakage problem caused by insufficient rigidity of the small drill bit by reducing the drilling depth of the drill bit. At present, this process method is more common in practical applications. However, this method also has obvious defects. Because the distance between the guide sleeve and the small hole is far when drilling the small hole, the guide sleeve can hardly play its due positioning role. Therefore, the small drill bit often drills along the drilling cone left by the large hole, which makes the small hole prone to drilling deviation and poor coaxiality. In addition, this also makes the roughness of the spherical bottom surface poor, and the surface is prone to vibration marks, thus affecting the processing quality.

[0003] Another method is to first drill a small hole in the stepped deep hole, and then use the guide sleeve on the template for positioning to expand the hole to the depth required by the process. Finally, the spherical bottom surface is countersunk. Although this method starts drilling from the surface of the workpiece when drilling, whether it is a large hole or a small hole, the guide sleeve can play its positioning role, so that the verticality of the small hole and the coaxiality with the large hole are relatively good. However, this method also has some shortcomings. First, the guide sleeve needs to be manually replaced every time drilling, which greatly reduces the processing efficiency. Secondly, when processing the spherical bottom surface, due to the lack of assistance from the guide sleeve, the roughness of the spherical bottom surface is often poor, and irregular vibration marks are prone to appear on the surface, thus affecting the overall processing quality. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a method for processing an injector body and its stepped deep hole and spherical bottom surface, so as to solve the problem that the existing machining center processes the stepped deep hole and spherical bottom surface of the injector body, and there are poor coaxiality and roughness that cannot meet product requirements. It can also solve the problem that the existing machining center processes the stepped deep hole and spherical bottom surface of the injector body, and there are low processing efficiency and low yield.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A method for processing a stepped deep hole and a spherical bottom surface of a fuel injector body comprises the following steps: S1, pre-drilling: fix the injector body to be processed on the machining center, use a drill bit with a first diameter to drill a blind hole with a first preset depth at a set position (end of the injector body), and leave a first preset margin, wherein the first preset depth is 2 to 3 times of the first diameter; S2, pre-boring: boring the blind hole so that the diameter of the blind hole is a first preset diameter; S3, drilling a deep hole: using the hole of the first preset diameter as a guide, using a gun drill with a second diameter to drill to a second preset depth, turning on internal cooling, and increasing the speed and feed rate of the gun drill, drilling to a blind hole with a depth of a third preset depth and a diameter of a third preset diameter, leaving a second preset margin, retracting the tool, turning off internal cooling, and exiting the gun drill; S4, forming countersinking: using the blind hole of the third preset depth as a guide, using a spherical countersink drill with a third diameter to machine a spherical bottom surface at the bottom of the blind hole to a fourth preset depth; S5, expanding and boring the hole: using an expanding tool and a boring tool to perform expanding and boring processing on the hole of the third preset diameter, so that the depth is the fifth preset depth and the diameter is the fourth preset diameter; S6. Hole expansion: using the hole of the fifth preset depth as a guide, a blade-type gun drill with a fourth diameter is used to drill to a sixth preset depth to obtain the injector body.

[0006] By performing pre-drilling, pre-boring, deep hole drilling, countersinking, boring and reaming on the injector body in sequence, the processed hole is used as a guide, and the clearance between the tool guide and the processed hole is matched to perform step deep hole processing and spherical bottom surface processing. Not only does it ensure that the step holes have a high coaxiality, but the roughness Ra of the hole wall and the spherical bottom surface is better than 1.6, meeting the processing technology requirements of the injector body. It effectively solves the problems of low coaxiality and roughness that cannot meet product requirements in the existing machining center in the processing of step deep holes and spherical bottom surfaces.

[0007] Among them, the purpose of turning on the internal coolant in S3 is to improve the lubrication, cooling and chip removal effects to improve the processing quality.

[0008] Preferably, in S1, the first preset margin is 0.2 mm; By reserving the first preset allowance during the blind hole processing, drill wear is effectively compensated and the hole size accuracy and surface quality are ensured. The reserved allowance is removed by fine machining in the subsequent processing steps to achieve the design size and surface finish requirements. In addition, the reserved allowance can also reduce the scrap rate caused by drill size deviation or positioning error.

[0009] Preferably, in S1, the first diameter is 9.81-9.83 mm.

[0010] Preferably, in S1, the first preset depth is 20-25 mm.

[0011] Preferably, in S1, the first preset depth is 25 mm.

[0012] By using an alloy drill to drill the first preset depth, the processed blind hole can be used as a guide for subsequent processing, and stepped deep hole processing and spherical bottom surface processing are performed, ensuring the coaxiality between the stepped holes and the roughness requirements of the hole wall and the spherical bottom surface.

[0013] Preferably, in S1, the drill bit is an alloy drill bit, the drilling speed of the alloy drill bit is 2500-3000 r / min, and the feed rate is 200-360 mm / min.

[0014] The roughness requirements of the hole wall are guaranteed by precisely controlling the drilling speed and feed rate of the alloy drill bit.

[0015] Preferably, in S2, a fine boring tool is used to bore the blind hole, the fine adjustment accuracy of the fine boring tool is less than or equal to 0.01 mm, and the diameter of the fine boring tool is 10.01-10.03 mm.

[0016] Preferably, in S2, the first preset diameter is 10.01-10.03 mm.

[0017] Preferably, in S2, the rotation speed of the boring tool is 2000-2500 r / min, and the feed rate is 50-70 mm / min.

[0018] Preferably, in S2, the rotation speed of the fine boring tool is 2000 r / min, and the feed rate is 50 mm / min.

[0019] Preferably, in S2, the machining depth of the fine boring tool is 0.5-1 mm shallower than the first preset depth.

[0020] Preferably, in S2, the processing depth of the fine boring tool is 24 mm.

[0021] Preferably, in S3, the second diameter is 10-10.005 mm.

[0022] Preferably, in S3, the second preset margin is 0.2 mm.

[0023] Preferably, in S3, the second preset depth is 0.5-1 mm shallower than the machining depth of the boring tool.

[0024] Preferably, in S3, the second preset depth is 23 mm.

[0025] Preferably, in S3, the third preset diameter is 10-10.005 mm.

[0026] Preferably, in S3, the rotation speed of the gun drill during the process of entering the second preset depth is 50-100 r / min, and the feed rate is 200-500 mm / min.

[0027] Preferably, in S3, the rotation speed of the gun drill during the process of entering the second preset depth is 50 r / min, and the feed rate is 200 mm / min.

[0028] Preferably, in S3, the rotation speed of the gun drill during drilling to the third preset depth is 1200-1800 r / min, and the feed rate is 20-40 mm / min.

[0029] Preferably, in S3, the rotation speed of the gun drill during drilling to the third preset depth is 1500 r / min, and the feed rate is 30 mm / min.

[0030] Preferably, in S3, the third preset depth is 0.2 mm from the depth required by the process.

[0031] By cleverly limiting the speed of the gun drill entering to be lower than the speed of the gun drill drilling process, the gun drill can be ensured to enter the pre-processed hole smoothly, preventing the gun drill from bending due to excessively high speed and breaking the gun drill; at the same time, the feed rate of the gun drill entering is cleverly limited to be higher than the feed rate of the gun drill drilling process to reduce the idle tool time and improve processing efficiency.

[0032] The process requires a depth of 15 to 25 times the hole diameter. The process requires a depth of 150 to 250 mm.

[0033] Preferably, in S3, the pressure of the internal cooling is greater than or equal to 50 bar.

[0034] Preferably, in S3, the tool retraction distance is 2 mm.

[0035] Preferably, in S3, the rotation speed of the gun drill during withdrawal is 50-100 r / min, and the feed rate is 200-500 mm / min.

[0036] Preferably, in S3, the rotation speed of the gun drill during the withdrawal process is 50 r / min and the feed rate is 200 mm / min.

[0037] Preferably, in S4, the third diameter is 9.995-10 mm, and the ball countersink has an unsharpened guide portion.

[0038] By using a ball countersink with an uncut guide portion for processing, the uncut portion prevents scratching of the processed hole wall and reduces roughness. At the same time, it ensures that the ball countersink has sufficient support to prevent processing vibration and ensure the quality of hole bottom processing.

[0039] Preferably, the unsharpened guide portion of the ball countersink has a length of 20 to 30 mm.

[0040] Preferably, in S4, the rotation speed of the ball countersink entering and exiting the blind hole is 50-100 r / min, and the feed rate is 200-500 mm / min.

[0041] Preferably, in S4, the rotation speed of the ball countersink cutting process is 150r / min, when the ball countersink is greater than 0.05mm from the fourth preset depth, the feed rate is 5mm / min, when the ball countersink is less than or equal to 0.05mm from the fourth preset depth, the feed rate is 1 mm / min, and it stays for 0.5s when reaching the fourth preset depth.

[0042] Preferably, in S4, the fourth preset depth is a depth required by the process, wherein the depth required by the process is 150-250 mm.

[0043] Preferably, in S5, the fourth preset diameter is 15.01-15.03 mm.

[0044] Preferably, in S5, the fifth preset depth is 30 mm.

[0045] Preferably, in S6, the fourth diameter is 15-15.005 mm.

[0046] Preferably, in S6, the sixth preset depth is smaller than the fourth preset depth to form a stepped hole, wherein the sixth preset depth is 120-220 mm.

[0047] The present invention also provides a fuel injector body which is processed by the processing method of the present invention.

[0048] Preferably, the coaxiality of the injector body obtained by the machining is less than 0.05, and the roughness Ra of the hole wall and the spherical bottom surface is higher than 1.6.

[0049] Beneficial effects of the present invention: The processing method of the fuel injector body and its stepped deep hole and spherical bottom surface of the present invention performs pre-drilling, pre-boring, deep hole drilling, countersinking, boring and reaming treatment on the fuel injector body in sequence, thereby using the processed hole as a guide, combining the clearance fit between the tool guide and the processed hole, and performing stepped deep hole processing and spherical bottom surface processing. Not only does it ensure that the stepped holes have a high coaxiality, but the roughness Ra of the hole wall and the spherical bottom surface is better than 1.6, meeting the processing technology requirements of the fuel injector body. It has the advantages of convenient operation, high processing efficiency and high yield rate, and has promotion and application value in the field of mechanical processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1A flowchart of a method for processing a fuel injector body and its stepped deep hole and spherical bottom surface; Figure 2 is a schematic diagram of the structure of the processed injector body; Figure 3 It is a structural schematic diagram of a ball countersink; Figure 4 It is a schematic diagram of the structure of a blade-type gun drill; Figure 5 It is a schematic diagram of the structure of the alloy blade of the blade-type gun drill; Among them, 1-injector body to be processed; 2-drill bit; 3-fine boring tool; 4-gun drill; 5-spherical countersink; 6-reaming tool; 7-blade-type gun drill, 71-alloy blade, 72-alloy guide strip; 8-processed injector body, 81-spherical bottom surface. DETAILED DESCRIPTION

[0051] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0052] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0053] The present invention is intended to disclose a method for processing an injector body and a stepped deep hole and a spherical bottom surface thereof, so as to solve the problem that the existing machining center processes the stepped deep hole and the spherical bottom surface of the injector body, and the coaxiality is poor and the roughness cannot meet the product requirements. It can also solve the problem that the existing machining center processes the stepped deep hole and the spherical bottom surface of the injector body, and the machining efficiency is low and the yield rate is not high.

[0054] Among them, Figures 1 to 5 As shown, a method for processing a stepped deep hole and a spherical bottom surface of an injector body comprises the following steps: S1, pre-drilling: fix the injector body 1 to be processed on the machining center, use a drill bit 2 with a first diameter to drill a blind hole with a first preset depth at a set position (end of the injector body), and leave a first preset margin. The first preset depth is 2 to 3 times the first diameter; S2, pre-boring: boring the blind hole so that the diameter of the blind hole is a first preset diameter; S3, drilling a deep hole: using the hole of the first preset diameter as a guide, using a gun drill 4 with a second diameter to enter to a second preset depth, turning on internal cooling, and increasing the speed and feed rate of the gun drill, drilling to a blind hole with a depth of a third preset depth and a diameter of a third preset diameter, leaving a second preset margin, retracting the tool, turning off internal cooling, and exiting the gun drill; S4, forming countersinking: using the blind hole of the third preset depth as a guide, a spherical countersink 5 with a third diameter is used to machine the spherical bottom surface 81 at the bottom of the blind hole to a fourth preset depth; S5, boring and expanding the hole: using the reaming tool 6 and the boring tool to perform reaming and boring processing on the hole of the third preset diameter, so that the depth is the fifth preset depth and the diameter is the fourth preset diameter; S6, hole expansion: using the hole of the fifth preset depth as a guide, a blade-type gun drill 7 having a fourth diameter is used to drill the hole to the sixth preset depth to obtain a processed injector body 8.

[0055] By performing pre-drilling, pre-boring, deep hole drilling, countersinking, boring and reaming on the injector body in sequence, the processed hole is used as a guide, and the clearance between the tool guide and the processed hole is matched to perform step deep hole processing and spherical bottom surface processing. Not only does it ensure that the step holes have a high coaxiality, but the roughness Ra of the hole wall and the spherical bottom surface is better than 1.6, meeting the processing technology requirements of the injector body. It effectively solves the problems of low coaxiality and roughness that cannot meet product requirements in the existing machining center in the processing of step deep holes and spherical bottom surfaces.

[0056] The diameter of each deep hole drill is 0.005~0.03mm smaller than the diameter of the guide hole to be processed, which can play a good guiding and positioning role. Deep hole drills include alloy drills, gun drills and blade-type gun drills.

[0057] An alloy guide strip 72 is provided on the alloy blade 71 of the blade-type gun drill 7 .

[0058] For example, in order to effectively compensate for drill wear and ensure the dimensional accuracy and surface quality of the drilled hole, during the blind hole machining process in S1, the first preset margin is set to 0.2 mm.

[0059] In some embodiments, in S1, the first diameter is 9.81-9.83 mm.

[0060] In some embodiments, in S1, the first preset depth is 20-25 mm.

[0061] Exemplarily, in S1, the first preset depth is 25 mm, which serves as a guide for subsequent processing to perform stepped deep hole processing and spherical bottom surface processing to ensure the coaxiality between the stepped holes and the roughness requirements of the hole wall and the spherical bottom surface.

[0062] In some embodiments, in S1, in order to ensure the roughness requirement of the hole wall, the drill bit is an alloy drill bit, the drilling speed of the alloy drill bit is 2500~3000r / min, and the feed rate is 200~360mm / min.

[0063] In some embodiments, in S2, a fine boring tool 3 is used to perform boring processing on the blind hole, the fine boring tool 3 has a fine adjustment accuracy less than or equal to 0.01 mm, and the diameter of the fine boring tool 3 is 10.01-10.03 mm.

[0064] In some embodiments, in S2, the first preset diameter is 10.01-10.03 mm.

[0065] In some embodiments, in S2, the rotation speed of the fine boring tool 3 is 2000-2500 r / min, and the feed rate is 50-70 mm / min.

[0066] For example, in S2, the rotation speed of the fine boring tool 3 is 2000 r / min, and the feed rate is 50 mm / min.

[0067] In some embodiments, in S2, the machining depth of the fine boring tool 3 is 0.5-1 mm shallower than the first preset depth.

[0068] Exemplarily, in S2, the machining depth of the fine boring tool 3 is 24 mm.

[0069] Exemplarily, in S3, the second diameter is 10-10.005 mm.

[0070] Exemplarily, in S3, the second preset margin is 0.2 mm.

[0071] In some embodiments, in S3, the second preset depth is 0.5-1 mm shallower than the machining depth of the boring tool.

[0072] Exemplarily, in S3, the second preset depth is 23 mm.

[0073] Exemplarily, in S3, the third preset diameter is 10-10.005 mm.

[0074] In some embodiments, in S3, the rotation speed of the gun drill 4 during entering the second preset depth is 50-100 r / min, and the feed rate is 200-500 mm / min.

[0075] Exemplarily, in S3, the rotation speed of the gun drill 4 during entering the second preset depth is 50 r / min, and the feed rate is 200 mm / min.

[0076] In some embodiments, in S3, the rotation speed of the gun drill 4 during drilling to the third preset depth is 1200-1800 r / min, and the feed rate is 20-40 mm / min.

[0077] Exemplarily, in S3, the rotation speed of the gun drill 4 during drilling to the third preset depth is 1500 r / min, and the feed rate is 30 mm / min.

[0078] For example, in S3, the third preset depth is 0.2 mm from the process required depth, wherein the process required depth is 15 to 25 times the hole diameter, and the process required depth is 150 to 250 mm.

[0079] Exemplarily, in S3, the pressure of the internal cooling is greater than or equal to 50 bar.

[0080] Exemplarily, in S3, the tool retraction distance is 2 mm.

[0081] In some embodiments, in S3, the rotation speed of the gun drill 4 during the withdrawal process is 50-100 r / min, and the feed rate is 200-500 mm / min.

[0082] For example, in S3, the rotation speed of the gun drill 4 during the withdrawal process is 50 r / min, and the feed rate is 200 mm / min.

[0083] In some embodiments, in S4, the third diameter is 9.995-10 mm, and the ball countersink 5 has an unsharpened guide portion.

[0084] By machining with a ball countersink with an uncut guide section, In some embodiments, the unsharpened guide portion of the ball countersink 5 has a length of 20-30 mm.

[0085] In some embodiments, in S4, the rotation speed of the ball countersink 5 entering and exiting the blind hole is 50-100 r / min, and the feed rate is 200-500 mm / min.

[0086] Exemplarily, in S4, the rotation speed of the ball countersink 5 entering and exiting the blind hole is 50 r / min, and the feed rate is 200 mm / min.

[0087] Exemplarily, in S4, the cutting speed of the ball countersink 5 is 150 r / min, when the ball countersink 5 is greater than 0.05 mm from the fourth preset depth, the feed rate is 5 mm / min, when the ball countersink 5 is less than or equal to 0.05 mm from the fourth preset depth, the feed rate is 1 mm / min, and it stays for 0.5 s when reaching the fourth preset depth.

[0088] Exemplarily, in S4, the fourth preset depth is a process required depth, wherein the process required depth is 150-250 mm.

[0089] Exemplarily, in S5, the fourth preset diameter is 15.01-15.03 mm.

[0090] Exemplarily, in S5, the fifth preset depth is 30 mm.

[0091] Exemplarily, in S6, the fourth diameter is 15-15.005 mm.

[0092] Exemplarily, in S6, the sixth preset depth is less than the fourth preset depth to form a stepped hole, wherein the sixth preset depth is 120-220 mm.

[0093] In some embodiments, a fuel injector body is also provided, which is processed by the above processing method.

[0094] The coaxiality of the injector body processed by the above method is less than 0.05, and the roughness Ra of the hole wall and the spherical bottom surface is higher than 1.6.

[0095] In summary, the processing method of the fuel injector body and its stepped deep hole and spherical bottom surface of the present invention performs pre-drilling, pre-boring, deep hole drilling, countersinking, boring and reaming on the fuel injector body in sequence, thereby using the processed hole as a guide, combined with the clearance fit between the tool guide and the processed hole, to perform stepped deep hole processing and spherical bottom surface processing. Not only does it ensure that the stepped holes have a high coaxiality, but the roughness Ra of the hole wall and the spherical bottom surface is higher than 1.6, which meets the processing technology requirements of the fuel injector body. It has the advantages of convenient operation, high processing efficiency and high yield rate, and has promotion and application value in the field of mechanical processing technology.

[0096] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A method for processing a stepped deep hole and a spherical bottom surface of an injector body, characterized in that: The following steps are involved: S1, pre-drilling: fix the injector body to be processed on the machining center, use a drill bit with a first diameter to drill a blind hole with a first preset depth at a set position, and leave a first preset margin, wherein the first preset depth is 2 to 3 times of the first diameter; S2, pre-boring: boring the blind hole so that the diameter of the blind hole is a first preset diameter; S3, drilling a deep hole: using the hole of the first preset diameter as a guide, using a gun drill with a second diameter to drill to a second preset depth, turning on internal cooling, and increasing the speed and feed rate of the gun drill, drilling to a blind hole with a depth of a third preset depth and a diameter of a third preset diameter, leaving a second preset margin, retracting the tool, turning off internal cooling, and exiting the gun drill; S4, forming countersinking: using the blind hole of the third preset depth as a guide, using a spherical countersink drill with a third diameter to machine a spherical bottom surface at the bottom of the blind hole to a fourth preset depth; S5, expanding and boring the hole: using an expanding tool and a boring tool to perform expanding and boring processing on the hole of the third preset diameter, so that the depth is the fifth preset depth and the diameter is the fourth preset diameter; S6. Hole expansion: using the hole of the fifth preset depth as a guide, a blade-type gun drill with a fourth diameter is used to drill to a sixth preset depth to obtain the injector body.

2. The processing method according to claim 1, characterized in that: In S1, the first preset margin is 0.2 mm; And / or, in S1, the first diameter is 9.81-9.83 mm; And / or, in S1, the first preset depth is 20-25 mm.

3. The processing method according to claim 1, characterized in that: In S1, the drill bit is an alloy drill bit, the drilling speed of the alloy drill bit is 2500-3000 r / min, and the feed rate is 200-360 mm / min.

4. The processing method according to claim 1, characterized in that: In S2, the blind hole is bored by a fine boring tool, the fine adjustment accuracy of the fine boring tool is less than or equal to 0.01 mm, and the diameter of the fine boring tool is 10.01-10.03 mm; And / or, in S2, the first preset diameter is 10.01-10.03 mm; And / or, in S2, the rotation speed of the boring tool is 2000-2500 r / min, and the feed rate is 50-70 mm / min; And / or, in S2, the machining depth of the boring tool is 0.5-1 mm shallower than the first preset depth.

5. The processing method according to claim 1, characterized in that: In S3, the second diameter is 10-10.005 mm; And / or, in S3, the second preset margin is 0.2 mm; And / or, in S3, the second preset depth is 0.5-1 mm shallower than the machining depth of the boring tool; And / or, in S3, the third preset diameter is 10-10.005 mm; And / or, in S3, the rotation speed of the gun drill during entering the second preset depth is 50-100 r / min, and the feed rate is 200-500 mm / min; And / or, in S3, the rotation speed of the gun drill during drilling to the third preset depth is 1200-1800 r / min, and the feed rate is 20-40 mm / min; And / or, in S3, the third preset depth is 0.2 mm from the depth required by the process.

6. The processing method according to claim 1, characterized in that: In S3, the pressure of the inner cooling is greater than or equal to 50 bar; And / or, in S3, the tool withdrawal distance is 2 mm; And / or, in S3, the rotation speed of the gun drill during the withdrawal process is 50-100 r / min, and the feed rate is 200-500 mm / min.

7. The processing method according to claim 1, characterized in that: In S4, the third diameter is 9.995-10 mm, and the ball countersink has an unsharpened guide portion; And / or, in S4, the rotation speed of the ball countersink entering and exiting the blind hole is 50-100 r / min, and the feed rate is 200-500 mm / min; And / or, in S4, the rotation speed of the ball countersink cutting process is 150 r / min, when the ball countersink is greater than 0.05 mm from the fourth preset depth, the feed rate is 5 mm / min, when the ball countersink is less than or equal to 0.05 mm from the fourth preset depth, the feed rate is 1 mm / min, and the ball countersink stays for 0.5 s when reaching the fourth preset depth; And / or, in S4, the fourth preset depth is a depth required by the process.

8. The processing method according to claim 1, characterized in that: In S5, the fourth preset diameter is 15.01-15.03 mm; And / or, in S5, the fifth preset depth is 30 mm.

9. The processing method according to claim 1, characterized in that: In S6, the fourth diameter is 15-15.005 mm; And / or, in S6, the sixth preset depth is smaller than the fourth preset depth to form a stepped hole.

10. A fuel injector body, characterized in that: The product is obtained by processing using the processing method described in any one of claims 1 to 9.

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