CN103286555B - Method for screwing down oil injector assembly - Google Patents
Method for screwing down oil injector assembly Download PDFInfo
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- CN103286555B CN103286555B CN201310233255.8A CN201310233255A CN103286555B CN 103286555 B CN103286555 B CN 103286555B CN 201310233255 A CN201310233255 A CN 201310233255A CN 103286555 B CN103286555 B CN 103286555B
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Abstract
The invention discloses a method for screwing down an oil injector assembly. The method for screwing down the oil injector assembly comprises the following steps of (1) carrying out accurate grinding on a sealing face of an oil injector body, cleaning the oil injector body and a fastening nut, carrying out a preparatory process before screwing-down operation, evenly stirring an antioxidant and deionized water, adding the mixed liquid of the antioxidant and the deionized water to a liquid storage box of a waxing machine, pumping the mixed liquid into a waxing barrel of the waxing machine, immersing the fastening nut in the mixed liquid, discharging the mixed liquid, rotating the waxing barrel in a high-speed mode to throw liquid so as to dry the fastening nut, preassembling the oil ejector assembly, (2) setting a screwing-down program of an automatic screwing-down machine to be an angle control program, setting a screwing-down angle in the angle control program to be 32 degrees, setting initial screwing-down torque to be 10N*m, (3) carrying out high-speed grinding-in on the oil ejector assembly, and (4) carrying out performance tests on the oil ejector assembly. According to the method for screwing down the oil injector assembly, axial pressure scatter difference produced in the process of screwing down the fastening nut is about one third of that in the prior art. When the method for screwing down the oil injector assembly is adopted, under the action of the same screwing-down torque, axial pressure produced in the process of screwing down the fastening nut is increased by 30%-50%, and sealing performance of the oil ejector assembly is improved.
Description
Technical field
The invention discloses the tightening method a kind of diesel engine spraying the injector assembly that diesel oil uses.
Background technology
All use injector assembly to carry out diesel injection on a diesel engine, injector assembly is made up of parts such as oil injector body, tight cap, spring, dividing plate and oil nozzles, and injector assembly tightens whether tightening of cap and has a great impact the serviceability tool of injector assembly.
Now, the tightening method of conventional injector assembly comprises the steps:
1, super grinding oil injector body sealing surface;
2,400bar high pressure removes oil injector body aperture burr;
3, high-voltage pulse cleaning oil injector body;
4, oil injector body filter core hole classification;
5, oil injector body is press-fitted filter core;
6, high-voltage pulse cleaning oil injector body;
7, appearance test oil injector body;
8, the parts such as Ultrasonic Cleaning oil injector body, tight cap;
9, word steel seal is rubbed with the hands;
10, pre-assembled injector assembly;
11, pre-adjustment injection pressure of injector;
12, moment of torsion control methods tightens tight cap;
13, rapid seating injector assembly;
14, injector assembly performance test;
15, print and paste Quick Response Code;
16, oil nozzle extension elongation and outward appearance is detected;
17, upper antirust, helmet and annex are installed;
18, comprehensive test and packaging.
In tightening technique flow process originally, tight cap does not carry out surface treatment, tighten tight cap and adopt moment of torsion control methods, when using moment of torsion control methods to tighten, the screw-down torque of about 90% is consumed by screw thread and supporting surface friction torque, and frictional dissipation is by the impact of the factors such as friction surface roughness, surface treatment situation, material hardness, cleaning performance, therefore the scattered error of axial compressive force is very large, and its scope can reach 40% ~ 60%.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of can increase injector assembly sealing property, effectively can reduce the tightening method that the injector assembly of oil leakage phenomenon appears in fuel injector in the course of the work.
According to technical scheme provided by the invention, the tightening method of described injector assembly comprises the steps:
The sealing surface of a, fine grinding oil injector body, make sealing surface flatness≤1.5 of oil injector body μm, oil injector body sealing surface roughness≤1.5 μm and the sealing surface double thread of oil injector body is beated≤0.05mm;
B, parts such as cleaning oil injector body and tight cap etc.;
C, tighten front preparatory process;
D, antioxidant and deionized water are joined waxer liquid reserve tank in and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10% ~ 13%;
E, mixed liquor is drawn into waxer waxing bucket in tight cap to be immersed in mixed liquor 120 seconds, by mixed liquor venting, then make the waxing bucket of waxer with the rotational speed of 260 ~ 280rpm, waxing bucket rotates dries tight cap with 110 ~ 130 DEG C of temperature simultaneously, makes tight cap surface form the dry lubricant film of 0.002 ~ 0.003 mm of thickness;
F, pre-assembled injector assembly;
G, the data wire of computer to be connected with the data-interface of automatic screwing device, be Angle ambiguity program by the program setting of tightening of automatic screwing device, angle initialization of tightening in Angle ambiguity program is 32 °, initial screw-down torque is set as 10 Ns of rice, then, automatic screwing device is made automatically to be tightened on oil injector body by tight cap according to program and corresponding setup parameter;
H, rapid seating injector assembly;
I, injector assembly performance test.
In step g, the angle initialization of tightening in Angle ambiguity program is 32 °, and initial screw-down torque is set as 10 Ns of rice.
The axial compressive force scattered error adopting method of the present invention to tighten the generation of tight cap is about 1/3rd of art methods, adopt method of the present invention, under identical screw-down torque effect, the axial compressive force of tightening the generation of tight cap improves 30% ~ 50%, adds the sealing property of injector assembly.
Detailed description of the invention
Below in conjunction with instantiation, the invention will be further described.
In the present invention, antioxidant is that wheat dolantin science and technology (Suzhou) Co., Ltd produces, and the English full name of antioxidant is: Torque ' n Tension UV Fluid, production number is: 119932.
A kind of tightening method of injector assembly comprises the steps:
The sealing surface of a, fine grinding oil injector body, make sealing surface flatness≤1.5 of oil injector body μm, oil injector body sealing surface roughness≤1.5 μm and the sealing surface double thread of oil injector body is beated≤0.05mm;
B, cleaning oil injector body and tight cap;
C, tighten front preparatory process;
D, antioxidant and deionized water are joined waxer liquid reserve tank in and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10% ~ 13%;
E, mixed liquor is drawn into waxer waxing bucket in tight cap to be immersed in mixed liquor 120 seconds, by mixed liquor venting, then make waxing bucket with the rotational speed of 260 ~ 280rpm, waxing bucket rotates dries tight cap with 110 ~ 130 DEG C of temperature simultaneously, tight cap surface is made to form the dry lubricant film of 0.002 ~ 0.003 mm of thickness, the antiseptic power of tight cap part can be increased like this, particularly greatly can reduce the coefficient of friction of screw thread;
F, pre-assembled injector assembly;
G, the data wire of computer to be connected with the data-interface of automatic screwing device, be Angle ambiguity program by the program setting of tightening of automatic screwing device, angle initialization of tightening in Angle ambiguity program is 32 °, initial screw-down torque is set as 10 Ns of rice, then, automatic screwing device is made automatically to be tightened on oil injector body by tight cap according to program and corresponding setup parameter;
H, rapid seating injector assembly;
I, injector assembly performance test, namely detect the opening pressure of injector assembly, oil be close with tramp frequency.
Wherein, the cleaning oil injector body of step b and tight cap, step comprises: 380 ~ 450bar high pressure goes the aperture burr operation of oil injector body, the cleaning agent high-voltage pulse cleaning oil injector body operation of 60 ~ 80bar and Ultrasonic Cleaning oil injector body and tight cap operation.
The front preparatory process of tightening of step c comprises: the filter core hole of oil injector body carried out classification operation, be press-fitted filter core operation in the filter core hole of oil injector body, check the parts operations such as oil injector body outward appearance operation, Ultrasonic Cleaning spring, dividing plate.
Tight cap surface is coated with very thin coating of wax, greatly can reduce the coefficient of friction of screw thread, improve the lubrication of tight cap thread, and under identical screw-down torque effect, the axial compressive force of tightening the generation of tight cap improves 30% ~ 50%; Increase the sealing property of fuel injector.
Moment of torsion control methods screwed cap axial compressive force scattered error is large, and the axial compressive force scattered error that Angle ambiguity method screwed cap produces is the former 1/3rd; Adopt Angle ambiguity method to tighten tight cap, accurately can control axial compressive force, thus reliably ensure the sealing property of fuel injector, can effectively reduce fuel injector and occur oil leakage phenomenon in the course of the work.
The effect of every procedure is below described or designs the reason of this procedure.
The reason of design " sealing surface of fine grinding oil injector body " this procedure: after oil nozzle, dividing plate are tightened to oil injector body by tight cap, oil injector body seal face, dividing plate end face, oil nozzle end face press together tightly, thus play sealing function.
Design " 380 ~ 450bar high pressure goes the aperture burr operation of oil injector body " this procedure reason: after the processing of oil injector body mill, seal face aperture all can produce burr; Injection hole on injection nozzle diameter is very little, and diameter is 0.2 ~ 0.3 mm, washes away sealing surface by 380 ~ 450bar liquid high pressure, is stripped by oil injector body aperture burr, prevents from blocking injection hole on injection nozzle.
Design " the cleaning agent high-voltage pulse cleaning oil injector body operation of 60 ~ 80bar " this procedure reason: injection hole on injection nozzle diameter is very little, and diameter is 0.2 ~ 0.3 mm, burr and impurity in oil injector body high-pressure oil duct is washed away, prevents injection hole on injection nozzle from blocking.
Design " classification operation is carried out in the filter core hole of oil injector body " this procedure reason: filter core coordinates for interference with filter core hole, the magnitude of interference is 0.04 ~ 0.06mm, under guarantee is press-fitted the prerequisite of quality, in order to reduce the requirement of oil injector body filter core hole machined, the tolerance of expanded hole, reduces oil injector body filter core hole machined cost.
Design " being press-fitted filter core operation in the filter core hole of oil injector body " this procedure reason: oil injector body oil inlet end assembling filter core, the granule foreign in energy filter fuel, prevents injection hole on injection nozzle from blocking.
Design " inspection oil injector body outward appearance operation " this procedure reason: damage of oil injector body sealing surface and screw thread being damaged detects, and prevents injector assembly from having oil leakage phenomenon to occur.
Design " the parts operation such as Ultrasonic Cleaning oil injector body, tight cap, spring, dividing plate " this procedure reason: the impurity of cleaning component surface, improves injector assembly cleannes, increases injector assembly first-time qualification rate, prevent injection hole on injection nozzle from blocking.
Design " tight cap waxing " this procedure reason: tight cap interior threaded surface is coated with very thin coating of wax; Greatly can reduce the coefficient of friction of screw thread, improve the lubrication of tight cap thread, under identical screw-down torque effect, tighten the axial compressive force raising 30% ~ 50% that tight cap produces; Increase the sealing property of fuel injector.
Design " Angle ambiguity method tightens tight cap " this procedure reason: when oil inlet end oil pressure reaches 1000bar ~ 1400bar, tight cap is utilized to tighten, dividing plate, atomizer, oil injector body are tightened in together tightly, contact surface between them can play good sealing function, even if the very high injector assembly that also can not make of oil inlet end oil pressure operationally produces oil leakage phenomenon.
Design " injector assembly performance test " this procedure reason: whether qualifiedly detect injector assembly performance, the injector assembly only having performance qualified is assembled on the diesel engine that matches, and diesel engine just can reach desirable power and oil consumption.
Embodiment 1
A kind of tightening method of injector assembly comprises the steps:
The sealing surface of a, fine grinding oil injector body, make sealing surface flatness≤1.5 of oil injector body μm, oil injector body sealing surface roughness≤1.5 μm and the sealing surface double thread of oil injector body is beated≤0.05mm;
B, cleaning oil injector body and tight cap;
C, tighten front preparatory process;
D, antioxidant and deionized water are joined waxer liquid reserve tank in and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10%;
E, mixed liquor is drawn into waxer waxing bucket in tight cap to be immersed in mixed liquor 120 seconds, by mixed liquor venting, then bucket is waxed with the rotational speed of 260rpm, dry tight cap surface mixed liquor, waxing bucket rotates dries tight cap with 110 DEG C of temperature simultaneously, make tight cap surface form the dry lubricant film of 0.002 mm of thickness, the antiseptic power of tight cap part can be increased like this, particularly can reduce the coefficient of friction of tight cap internal thread greatly;
F, pre-assembled injector assembly;
G, the data wire of computer to be connected with the data-interface of automatic screwing device, be Angle ambiguity program by the program setting of tightening of automatic screwing device, angle initialization of tightening in Angle ambiguity program is 32 °, initial screw-down torque is set as 10 Ns of rice, then, automatic screwing device is made automatically to be tightened on oil injector body by tight cap according to program and corresponding setup parameter;
H, rapid seating injector assembly;
I, injector assembly performance test, namely detect the opening pressure of injector assembly, oil be close with tramp frequency.
The axial compressive force scattered error adopting the method for the present embodiment 1 to tighten the generation of tight cap is 22%, adopt the method for the present embodiment 1, under identical screw-down torque effect, the axial compressive force of tightening the generation of tight cap is 2.31 tons, this axial compressive force compared to existing technology method tighten tight cap produce axial compressive force improve 43.5%, add the sealing property of injector assembly.
Embodiment 2
A kind of tightening method of injector assembly comprises the steps:
The sealing surface of a, fine grinding oil injector body, make sealing surface flatness≤1.5 of oil injector body μm, oil injector body sealing surface roughness≤1.5 μm and the sealing surface double thread of oil injector body is beated≤0.05mm;
B, cleaning oil injector body and tight cap;
C, tighten front preparatory process;
D, antioxidant and deionized water are joined waxer liquid reserve tank in and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 12%;
E, tight cap is immersed in waxer waxing ladle mixing liquid in 120 seconds, by mixed liquor venting, then make the waxing bucket of waxer with the rotational speed of 270rpm, waxing bucket rotates dries tight cap with 120 DEG C of temperature simultaneously, tight cap surface is made to form the dry lubricant film of 0.0025 mm of thickness, the antiseptic power of tight cap part can be increased like this, particularly greatly can reduce coefficient of friction;
F, pre-assembled injector assembly;
G, the data wire of computer to be connected with the data-interface of automatic screwing device, be Angle ambiguity program by the program setting of tightening of automatic screwing device, angle initialization of tightening in Angle ambiguity program is 32 °, initial screw-down torque is set as 10 Ns of rice, then, automatic screwing device is made automatically to be tightened on oil injector body by tight cap according to program and corresponding setup parameter;
H, rapid seating injector assembly;
I, injector assembly performance test, namely detect the opening pressure of injector assembly, oil be close with tramp frequency.
The axial compressive force scattered error adopting the method for the present embodiment 2 to tighten the generation of tight cap is 21%, adopt the method for the present embodiment 2, under identical screw-down torque effect, the axial compressive force of tightening the generation of tight cap is 2.41 tons, this axial compressive force compared to existing technology method tighten tight cap produce axial compressive force improve 49.6%, add the sealing property of injector assembly.
Embodiment 3
A kind of tightening method of injector assembly comprises the steps:
The sealing surface of a, fine grinding oil injector body, make sealing surface flatness≤1.5 of oil injector body μm, oil injector body sealing surface roughness≤1.5 μm and the sealing surface double thread of oil injector body is beated≤0.05mm;
B, cleaning oil injector body and tight cap;
C, tighten front preparatory process;
D, antioxidant and deionized water are joined waxer liquid reserve tank in and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 13%;
E, be immersed in tight cap in the waxing bucket of waxer mixed liquor in 120 seconds, by mixed liquor venting, then make the waxing bucket of waxer with the rotational speed of 280rpm, waxing bucket rotates dries tight cap with 130 DEG C of temperature simultaneously, tight cap surface is made to form the dry lubricant film of 0.003 mm of thickness, the antiseptic power of tight cap part can be increased like this, particularly greatly can reduce coefficient of friction;
F, pre-assembled injector assembly;
G, the data wire of computer to be connected with the data-interface of automatic screwing device, be Angle ambiguity program by the program setting of tightening of automatic screwing device, angle initialization of tightening in Angle ambiguity program is 32 °, initial screw-down torque is set as 10 Ns of rice, then, automatic screwing device is made automatically to be tightened on oil injector body by tight cap according to program and corresponding setup parameter;
H, rapid seating injector assembly;
I, injector assembly performance test, namely detect the opening pressure of injector assembly, oil be close with tramp frequency.
The axial compressive force scattered error adopting the method for the present embodiment 3 to tighten the generation of tight cap is 21%, adopt the method for the present embodiment 3, under identical screw-down torque effect, the axial compressive force of tightening the generation of tight cap is 2.48 tons, this axial compressive force compared to existing technology method tighten tight cap produce axial compressive force improve 54%, add the sealing property of injector assembly.
Claims (1)
1. the tightening method of an injector assembly comprises the steps:
The sealing surface of a, fine grinding oil injector body, make sealing surface flatness≤1.5 of oil injector body μm, oil injector body sealing surface roughness≤1.5 μm and the sealing surface double thread of oil injector body is beated≤0.05mm;
B, cleaning oil injector body and tight cap;
C, tighten front preparatory process, comprise and the filter core hole of oil injector body carried out classification operation, be press-fitted filter core operation, inspection oil injector body outward appearance operation, Ultrasonic Cleaning spring, dividing plate operation in the filter core hole of oil injector body;
D, antioxidant and deionized water are joined waxer liquid reserve tank in and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10% ~ 13%;
E, mixed liquor is drawn into waxer waxing bucket in tight cap to be immersed in mixed liquor 120 seconds, by mixed liquor venting, tight cap is still in waxing bucket, then bucket is waxed with the rotational speed of 260 ~ 280rpm, the waxing bucket of waxer rotates dries tight cap with 110 ~ 130 DEG C of temperature simultaneously, makes tight cap surface form the dry lubricant film of 0.002 ~ 0.003 mm of thickness;
F, pre-assembled injector assembly;
G, the data wire of computer to be connected with the data-interface of automatic screwing device, be Angle ambiguity program by the program setting of tightening of automatic screwing device, angle initialization of tightening in Angle ambiguity program is 32 °, initial screw-down torque is set as 10 Ns of rice, then, automatic screwing device is made automatically to be tightened on oil injector body by tight cap according to program and corresponding setup parameter;
H, rapid seating injector assembly;
I, injector assembly performance test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310233255.8A CN103286555B (en) | 2013-06-13 | 2013-06-13 | Method for screwing down oil injector assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310233255.8A CN103286555B (en) | 2013-06-13 | 2013-06-13 | Method for screwing down oil injector assembly |
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| CN103286555A CN103286555A (en) | 2013-09-11 |
| CN103286555B true CN103286555B (en) | 2015-05-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107234425B (en) * | 2016-03-28 | 2019-05-31 | 博世华域转向系统（烟台）有限公司 | A kind of control method of component assembly bolt and nut screw-down torque |
| CN107962376B (en) * | 2017-12-27 | 2023-08-11 | 安徽威尔低碳科技股份有限公司 | Vacuum chuck type screwing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19545610C2 (en) * | 1995-12-07 | 1998-02-19 | Daimler Benz Ag | Process for the automatic screwing of two components and stud screw and union nut to carry out the process |
| CN201645138U (en) * | 2010-03-05 | 2010-11-24 | 刘海宁 | Horizontal multi-station automatic screwing machine |
| CN102588175A (en) * | 2012-01-19 | 2012-07-18 | 浙江汇锦梯尔镀层科技有限公司 | Novel injection pump control valve bush and surface processing method of novel injection pump control valve bush |
| CN202985051U (en) * | 2012-12-29 | 2013-06-12 | 机科发展科技股份有限公司 | Automatic fixed-torque or fixed-angle tightening device for tightening cap of fuel injector |
| CN103084834B (en) * | 2013-01-30 | 2015-01-07 | 中国第一汽车股份有限公司 | Top-mounted assembly technology of camshaft cylinder cover assembly |
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Owner name: WUXI WEIFU HIGH-TECH. GROUP CO., LTD. Effective date: 20131008 |
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Effective date of registration: 20131008 Address after: 214028 No. 8, Huashan Road, New District, Jiangsu, Wuxi Applicant after: Wuxi Weifu Automotive Diesel Systems Co., Ltd. Applicant after: Wuxi Weifu High-Technology Co., Ltd. Address before: 214028 No. 8, Huashan Road, New District, Jiangsu, Wuxi Applicant before: Wuxi Weifu Automotive Diesel Systems Co., Ltd. |
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Effective date of registration: 20180308 Address after: 214028 Wuxi New District, Jiangsu, Huashan Road, No. 5 Patentee after: Wuxi Weifu High-Technology Co., Ltd. Address before: 214028 No. 8, Huashan Road, New District, Jiangsu, Wuxi Co-patentee before: Wuxi Weifu High-Technology Co., Ltd. Patentee before: Wuxi Weifu Automotive Diesel Systems Co., Ltd. |
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