CN103286555A - Method for screwing down oil injector assembly - Google Patents
Method for screwing down oil injector assembly Download PDFInfo
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- CN103286555A CN103286555A CN2013102332558A CN201310233255A CN103286555A CN 103286555 A CN103286555 A CN 103286555A CN 2013102332558 A CN2013102332558 A CN 2013102332558A CN 201310233255 A CN201310233255 A CN 201310233255A CN 103286555 A CN103286555 A CN 103286555A
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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 of the injector assembly that sprays the diesel oil use on a kind of diesel engine.
Background technology
All use injector assembly to carry out diesel injection on diesel engine, injector assembly is made of parts such as oil injector body, tight cap, spring, dividing plate and oil nozzles, and the serviceability of whether tightening injector assembly that injector assembly tightens cap has very big influence.
Now, the tightening method of Chang Yong injector assembly comprises the steps:
1, super grinding oil injector body sealing surface;
2, the 400bar high pressure removes oil injector body aperture burr;
3, high-voltage pulse cleans oil injector body;
4, oil injector body filter core hole classification;
5, oil injector body is press-fitted filter core;
6, high-voltage pulse cleans oil injector body;
7, appearance test oil injector body;
8, ultrasonic wave cleans parts such as oil injector body, tight cap;
9, rub word steel seal with the hands;
10, pre-assembled injector assembly;
11, pre-adjustment injection pressure of injector;
12, moment of torsion control method is tightened tight cap;
13, rapid seating injector assembly;
14, injector assembly performance test;
15, printing and stickup two-dimension code;
16, detect oil nozzle extension elongation and outward appearance;
17, go up antirust, helmet and annex be installed;
18, comprehensive test and packing.
Tightening in the technological process originally, tight cap does not carry out surface treatment, tighten tight cap and adopt moment of torsion control method, when using moment of torsion control method to tighten, screw-down torque about 90% is consumed by screw thread and supporting surface friction torque, and frictional dissipation is subjected to the influence of factors such as friction surface roughness, surface treatment situation, material hardness, cleaning performance, so the scattered error of axial compressive force is very big, and its scope can reach 40% ~ 60%.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of sealing property that can increase injector assembly is provided, can effectively reduces 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, correct grinding oil injector body is beated≤0.05mm the sealing surface flatness≤1.5 μ m of oil injector body, the sealing surface roughness≤1.5 μ m of oil injector body and the sealing surface double thread of oil injector body;
Parts such as b, cleaning oil injector body and tight cap;
C, tighten preceding preparatory process;
D, antioxidant and deionized water joined in the liquid reserve tank of waxer and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10% ~ 13%;
E, mixed liquor is drawn in the waxing bucket of waxer tight cap and is immersed in the mixed liquor 120 seconds, with the mixed liquor venting, make the waxing bucket of waxer with the rotational speed of 260 ~ 280rpm then, the waxing bucket rotates dries tight cap with 110 ~ 130 ℃ of temperature simultaneously, makes tight cap surface form the dryness lubricating film of 0.002 ~ 0.003 millimeter thickness;
F, pre-assembled injector assembly;
G, the data wire of computer and the data-interface of automatic screwing device are joined, be the angle control program with the program setting of tightening of automatic screwing device, the angle initialization of tightening in the angle control program is 32 °, initial screw-down torque is set at 10 Ns of rice, then, make automatic screwing device automatically tight cap is tightened on the oil injector body 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 the angle control program is 32 °, and initial screw-down torque is set at 10 Ns of rice.
The axial compressive force scattered error that adopts method of the present invention to tighten tight cap generation 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 tight cap generation has improved 30% ~ 50%, has increased the sealing property of injector assembly.
The specific embodiment
The invention will be further described below in conjunction with instantiation.
Among 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, correct grinding oil injector body is beated≤0.05mm the sealing surface flatness≤1.5 μ m of oil injector body, the sealing surface roughness≤1.5 μ m of oil injector body and the sealing surface double thread of oil injector body;
B, cleaning oil injector body and tight cap;
C, tighten preceding preparatory process;
D, antioxidant and deionized water joined in the liquid reserve tank of waxer and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10% ~ 13%;
E, mixed liquor is drawn in the waxing bucket of waxer tight cap and is immersed in the mixed liquor 120 seconds, with the mixed liquor venting, make the waxing bucket with the rotational speed of 260 ~ 280rpm then, the waxing bucket rotates dries tight cap with 110 ~ 130 ℃ of temperature simultaneously, make tight cap surface form the dryness lubricating film of 0.002 ~ 0.003 millimeter thickness, can increase the antiseptic power of tight cap part like this, particularly can reduce the coefficient of friction of screw thread greatly;
F, pre-assembled injector assembly;
G, the data wire of computer and the data-interface of automatic screwing device are joined, be the angle control program with the program setting of tightening of automatic screwing device, the angle initialization of tightening in the angle control program is 32 °, initial screw-down torque is set at 10 Ns of rice, then, make automatic screwing device automatically tight cap is tightened on the oil injector body 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, oily close and 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 of 60 ~ 80bar to clean oil injector body operation and ultrasonic wave cleaning oil injector body and tight cap operation.
The preceding preparatory process of tightening of step c comprises: the filter core hole of oil injector body is carried out the classification operation, is press-fitted the filter core operation in the filter core hole of oil injector body, is checked oil injector body outward appearance operation, ultrasonic wave to clean parts operations such as spring, dividing plate.
Tight cap surface is coated with very thin one deck wax, can reduce the coefficient of friction of screw thread greatly, improves the lubricated of tight cap thread, and under identical screw-down torque effect, the axial compressive force of tightening tight cap generation has improved 30% ~ 50%; Increase the sealing property of fuel injector.
Moment of torsion control method screwed cap axial compressive force scattered error is big, and the axial compressive force scattered error that angle control method screwed cap produces is the former 1/3rd; Adopt angle control method to tighten tight cap, can accurately control axial compressive force, thereby guarantee the sealing property of fuel injector reliably, can effectively reduce fuel injector and occur oil leakage phenomenon in the course of the work.
The below effect of explanation per pass operation or design the reason of this procedure.
The reason of this procedure of design " sealing surface of correct grinding oil injector body ": after tight cap tightened to oil injector body with oil nozzle, dividing plate, oil injector body seal face, dividing plate end face, oil nozzle end face pressed together tightly, thereby 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, the seal face aperture all can produce burr; The injection hole on injection nozzle diameter is very little, and diameter is 0.2 ~ 0.3 mm, washes away sealing surface with 380 ~ 450bar liquid high pressure, and oil injector body aperture burr is stripped from, and prevents from blocking injection hole on injection nozzle.
This procedure reason of design " the cleaning agent high-voltage pulse of 60 ~ 80bar cleans the oil injector body operation ": the injection hole on injection nozzle diameter is very little, and diameter is 0.2 ~ 0.3 mm, and burr and impurity in the oil injector body high-pressure oil duct are washed away, and prevents that injection hole on injection nozzle from blocking.
Design " the classification operation is carried out in the filter core hole of oil injector body " this procedure reason: it is interference that filter core cooperates with the filter core hole, the magnitude of interference is 0.04 ~ 0.06mm, be press-fitted under the prerequisite of quality in assurance, in order to reduce oil injector body filter core hole processing request, the tolerance of expanded hole reduces oil injector body filter core hole processing cost.
Design " the filter core hole at oil injector body is press-fitted the filter core operation " this procedure reason: oil injector body oil inlet end assembling filter core, the granule foreign in the energy filter fuel prevents that injection hole on injection nozzle from blocking.
This procedure reason of design " check oil injector body outward appearance operation ": oil injector body sealing surface and screw thread damaged to damage to be detected, and prevents that injector assembly from having oil leakage phenomenon to take place.
This procedure reason of design " ultrasonic wave cleans parts operations such as oil injector body, tight cap, spring, dividing plate ": clean the impurity of component surface, improve the injector assembly cleannes, increase the injector assembly first-time qualification rate, prevent that injection hole on injection nozzle from blocking.
This procedure reason of design " tight cap waxing ": tight cap interior threaded surface is coated with very thin one deck wax; Can reduce the coefficient of friction of screw thread greatly, improve the lubricated 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 control method is tightened tight cap " this procedure reason: when the oil inlet end oil pressure reaches 1000bar ~ 1400bar, utilize tight cap to tighten, dividing plate, atomizer, oil injector body are tightened in together tightly, contact-making surface between them can play good sealing function, even the very high injector assembly that also can not make of oil inlet end oil pressure produces oil leakage phenomenon when work.
Design " injector assembly performance test " this procedure reason: whether qualified, qualified injector assembly is assembled on the diesel engine that matches to have only performance if detecting the injector assembly performance, 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, correct grinding oil injector body is beated≤0.05mm the sealing surface flatness≤1.5 μ m of oil injector body, the sealing surface roughness≤1.5 μ m of oil injector body and the sealing surface double thread of oil injector body;
B, cleaning oil injector body and tight cap;
C, tighten preceding preparatory process;
D, antioxidant and deionized water joined in the liquid reserve tank of waxer and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10%;
E, mixed liquor is drawn in the waxing bucket of waxer tight cap and is immersed in the mixed liquor 120 seconds, with the mixed liquor venting, the waxing bucket is with the rotational speed of 260rpm then, dry tight cap surface mixed liquor, the waxing bucket rotates dries tight cap with 110 ℃ of temperature simultaneously, make tight cap surface form the dryness lubricating film of 0.002 millimeter thickness, can increase the antiseptic power of tight cap part 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 and the data-interface of automatic screwing device are joined, be the angle control program with the program setting of tightening of automatic screwing device, the angle initialization of tightening in the angle control program is 32 °, initial screw-down torque is set at 10 Ns of rice, then, make automatic screwing device automatically tight cap is tightened on the oil injector body 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, oily close and tramp frequency.
The axial compressive force scattered error that the method for employing present embodiment 1 is tightened tight cap generation is 22%, adopt the method for present embodiment 1, under identical screw-down torque effect, the axial compressive force of tightening tight cap generation is 2.31 tons, this axial compressive force method is compared to existing technology tightened the axial compressive force that tight cap produces and has been improved 43.5%, has increased the sealing property of injector assembly.
Embodiment 2
A kind of tightening method of injector assembly comprises the steps:
The sealing surface of a, correct grinding oil injector body is beated≤0.05mm the sealing surface flatness≤1.5 μ m of oil injector body, the sealing surface roughness≤1.5 μ m of oil injector body and the sealing surface double thread of oil injector body;
B, cleaning oil injector body and tight cap;
C, tighten preceding preparatory process;
D, antioxidant and deionized water joined in the liquid reserve tank of waxer and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 12%;
E, tight cap is immersed in the waxing ladle mixing liquid of waxer 120 seconds, with the mixed liquor venting, make the waxing bucket of waxer with the rotational speed of 270rpm then, the waxing bucket rotates dries tight cap with 120 ℃ of temperature simultaneously, make tight cap surface form the dryness lubricating film of 0.0025 millimeter thickness, the antiseptic power of tight cap part can be increased like this, particularly coefficient of friction can be reduced greatly;
F, pre-assembled injector assembly;
G, the data wire of computer and the data-interface of automatic screwing device are joined, be the angle control program with the program setting of tightening of automatic screwing device, the angle initialization of tightening in the angle control program is 32 °, initial screw-down torque is set at 10 Ns of rice, then, make automatic screwing device automatically tight cap is tightened on the oil injector body 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, oily close and tramp frequency.
The axial compressive force scattered error that the method for employing present embodiment 2 is tightened tight cap generation is 21%, adopt the method for present embodiment 2, under identical screw-down torque effect, the axial compressive force of tightening tight cap generation is 2.41 tons, this axial compressive force method is compared to existing technology tightened the axial compressive force that tight cap produces and has been improved 49.6%, has increased the sealing property of injector assembly.
Embodiment 3
A kind of tightening method of injector assembly comprises the steps:
The sealing surface of a, correct grinding oil injector body is beated≤0.05mm the sealing surface flatness≤1.5 μ m of oil injector body, the sealing surface roughness≤1.5 μ m of oil injector body and the sealing surface double thread of oil injector body;
B, cleaning oil injector body and tight cap;
C, tighten preceding preparatory process;
D, antioxidant and deionized water joined in the liquid reserve tank of waxer and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 13%;
E, tight cap is immersed in the mixed liquor in the waxing bucket of waxer 120 seconds, with the mixed liquor venting, make the waxing bucket of waxer with the rotational speed of 280rpm then, the waxing bucket rotates dries tight cap with 130 ℃ of temperature simultaneously, make tight cap surface form the dryness lubricating film of 0.003 millimeter thickness, the antiseptic power of tight cap part can be increased like this, particularly coefficient of friction can be reduced greatly;
F, pre-assembled injector assembly;
G, the data wire of computer and the data-interface of automatic screwing device are joined, be the angle control program with the program setting of tightening of automatic screwing device, the angle initialization of tightening in the angle control program is 32 °, initial screw-down torque is set at 10 Ns of rice, then, make automatic screwing device automatically tight cap is tightened on the oil injector body 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, oily close and tramp frequency.
The axial compressive force scattered error that the method for employing present embodiment 3 is tightened tight cap generation is 21%, adopt the method for present embodiment 3, under identical screw-down torque effect, the axial compressive force of tightening tight cap generation is 2.48 tons, this axial compressive force method is compared to existing technology tightened the axial compressive force that tight cap produces and has been improved 54%, has increased the sealing property of injector assembly.
Claims (2)
1. the tightening method of an injector assembly comprises the steps:
The sealing surface of a, correct grinding oil injector body is beated≤0.05mm the sealing surface flatness≤1.5 μ m of oil injector body, the sealing surface roughness≤1.5 μ m of oil injector body and the sealing surface double thread of oil injector body;
B, cleaning oil injector body and tight cap;
C, tighten preceding preparatory process;
D, antioxidant and deionized water joined in the liquid reserve tank of waxer and stir, form mixed liquor, the weight percentage of antioxidant in mixed liquor is 10% ~ 13%;
E, mixed liquor is drawn in the waxing bucket of waxer tight cap and is immersed in the mixed liquor 120 seconds, with the mixed liquor venting, tight cap is still in the waxing bucket, the waxing bucket is with the rotational speed of 260 ~ 280rpm then, the waxing bucket of waxer rotates dries tight cap with 110 ~ 130 ℃ of temperature simultaneously, makes tight cap surface form the dryness lubricating film of 0.002 ~ 0.003 millimeter thickness;
F, pre-assembled injector assembly;
G, the data wire of computer and the data-interface of automatic screwing device are joined, be the angle control program with the program setting of tightening of automatic screwing device, the angle initialization of tightening in the angle control program is 32 °, initial screw-down torque is set at 10 Ns of rice, then, make automatic screwing device automatically tight cap is tightened on the oil injector body according to program and corresponding setup parameter;
H, rapid seating injector assembly;
I, injector assembly performance test.
2. the tightening method of injector assembly as claimed in claim 1, it is characterized in that: in the step g, the angle initialization of tightening in the angle control program is 32 °, initial screw-down torque is set at 10 Ns of rice.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310233255.8A CN103286555B (en) | 2013-06-13 | 2013-06-13 | Method for screwing down oil injector assembly |
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| CN201310233255.8A CN103286555B (en) | 2013-06-13 | 2013-06-13 | Method for screwing down oil injector assembly |
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| CN103286555B CN103286555B (en) | 2015-05-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107234425A (en) * | 2016-03-28 | 2017-10-10 | 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 |
| CN107962376A (en) * | 2017-12-27 | 2018-04-27 | 合肥威尔燃油系统股份有限公司 | Vacuum cap type device for screwing up |
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| CN107234425A (en) * | 2016-03-28 | 2017-10-10 | 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 |
| 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 |
| CN107962376A (en) * | 2017-12-27 | 2018-04-27 | 合肥威尔燃油系统股份有限公司 | Vacuum cap type device for screwing up |
| 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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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. |