CN101780625A - Processing technology for connecting rod of shock absorber - Google Patents
Processing technology for connecting rod of shock absorber Download PDFInfo
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- CN101780625A CN101780625A CN201010023002A CN201010023002A CN101780625A CN 101780625 A CN101780625 A CN 101780625A CN 201010023002 A CN201010023002 A CN 201010023002A CN 201010023002 A CN201010023002 A CN 201010023002A CN 101780625 A CN101780625 A CN 101780625A
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Abstract
The invention relates to the technical field of connecting rod processing technology, in particular to a processing technology for a connecting rod of a shock absorber. The processing technology for the connecting rod of the shock absorber is characterized in comprising: turning the excircle of a client side; turning the excircle of a piston; cutting a groove; adopting a four-blade end mill to mill flat power at 1500 turns/ minute; polishing; hobbing; quenching, wherein the quenching depth is 1.2 mm; quenching at the mill flat power circular bead of the connecting rod to ensure RHT 350 and HVI min 0.22; grinding; chroming; tempering at 180 DEG C for 1 hour to ensure that HRA is more than or equal to 70 and ensure RHT 350 and HVI min 1.0; and super-fine grinding. Compared with the prior art, the invention adopts the four-blade end mill, and a tool is replaced when processing 1500 pieces to ensure stable tool performance; the revolving speed of a milling machine is improved to 1500 turns/ minute; the four-blade end mill is matched to improve the fineness of the surface of a workpiece; and electric frequency quenching depth is adjusted to 1.2 mm to ensure that the circular bead has enough quenching layers.
Description
[technical field]
The present invention relates to Machining of Connecting Rod technology field, specifically a kind of processing technology of damper link.
[background technology]
Main engine plants, be screwed to a locking nut on the screw thread of connecting rod client parts strings such as upper junction plate, bearing springs to connecting rod during damper in assembling, like this these parts of going here and there on the connecting rod are assembled together.When nutting, for preventing the connecting rod transfer, will process a structure on connecting rod, the assembly tooling of main engine plants can utilize this structure to prevent the connecting rod transfer, owing to the reason of the chassis structure of Citreen C5, french citroen has designed a very unique anti-transfer mechanism, just mill flat gesture, it is to adopt the single-blade slotting cutter, and 600 rev/mins are milled flat gesture, quench in connecting rod bar portion simultaneously, the depth of quenching is 0.2mm.Through the endurancing of vehicle simulation road, connecting rod is milling flat gesture step place fatigue cracking.Stress can be gathered in the local and rapid place of some transition regions of testpieces poor surface smoothness, when fatigue test proceeds to a certain degree, forms fatigue cracking.Therefore, the cracking of judging connecting rod milling potential fillet place is relevant with surface smoothness, the fillet crudy of testpieces, in addition, we are also noted that the electricity frequency depth of quenching only has 0.4mm, and, be subject to workpiece geometries at the fillet place that cracking takes place, almost there is not quench hardened case, judge that thus the cracking reason has two: 1, mills flat gesture is that a quilt is milled out next plane, controls the surface smoothness difficulty of its surface smoothness than control link working face; 2, it is recessed to mill flat gesture, the electricity depth as shallow that the depth ratio connecting rod working face that reaches quenches and reaches of quenching frequently.
[summary of the invention]
The objective of the invention is to overcome the deficiencies in the prior art, adopt improved technology, prevent that connecting rod from milling flat gesture step place fatigue cracking.
For achieving the above object, design a kind of processing technology of damper link, it is characterized in that: (1) adopts Digit Control Machine Tool one-shot forming car to go out connecting rod client cylindrical; (2) adopt Digit Control Machine Tool one-shot forming car to go out the connecting rod piston pin end cylindrical; (3) adopt Digit Control Machine Tool to cut groove; (4) CNC milling machine adopts four sword slotting cutters to mill flat gesture, 1500 rev/mins; (5) adopt the polishing machine polishing; (6) adopt the screw-rolling machine gear hobbing; (7) quench: the electricity energy that frequently quenches is 2000～4000, quenching liquid pressure be 7+/-1.5bar, quench on connecting rod bar portion quench zone surface, make HRA 〉=70, RHT 350, the depth of quenching is 1.2mm, HV1
Min1.0; Quench at the flat gesture fillet of milling of connecting rod place, make RHT350, HVI
Min0.22; (8) grinding: diameter, linearity; (9) chromium plating makes chromium coating hardness min.900, and HV 0.05; Chromium coating thickness 〉=10micro; Chrome-plated surface allows fine fisssure number＜1500r/m; (10) tempering: at connecting rod bar portion quench zone surface temper, 180 ℃, 1h makes HRA 〉=70; RHT 350, HV1
Min1.0; (11) fine abrasive.
Tool changing behind 1500 connecting rods of the every processing of four sword slotting cutters.
The present invention compares with prior art, and the milling cutter that the connecting rod machined is used makes into to be commonly called as the nose of an ox cutter from four sword slotting cutters of three Korea Spro's cutter companies customization from common single cutting tool, and 1500 replacing cutters of every processing, has guaranteed the stable of cutting performance; The milling machine rotary speed is brought up to 1500 rev/mins by original 600 rev/mins, cooperates the high speed rotation of four sword slotting cutters can improve the surface smoothness of workpiece effectively, and the fineness of surface of the work and fillet quality have reached specification requirement; The electricity depth of quenching is frequently adjusted to 1.2mm, has guaranteed that also there are enough quench hardened cases at the fillet place.
[description of drawings]
Fig. 1 is the structural representation of connecting rod in the embodiment of the invention.
Fig. 2 is the partial enlarged drawing in connecting rod left end X zone among Fig. 1.
Fig. 3 is that the B-B at connecting rod milling potential place among Fig. 2 is to sectional side elevation.
Fig. 4 be among Fig. 2 the A of connecting rod milling potential place to vertical view.
Fig. 5 is the partial enlarged drawing at ladder place shown in the Z among Fig. 1.
Fig. 6 is the partial enlarged drawing of slot part shown in the Y among Fig. 1.
Appointment Fig. 1 is a Figure of abstract.
Referring to Fig. 1, H1 is the quenching transition region; C1 is the chromium plating transition region; H is connecting rod bar portion quenching zone; C is connecting rod bar portion chromium plating zone; C-H is chromium plating/quenching transitional region; T is the screw thread transitional region; 3 is the client gear hobbing; 4 is the piston end gear hobbing;
Referring to Fig. 2,1 for milling flat gesture;
Referring to Fig. 3,2 for milling the fillet of flat gesture;
Referring to Fig. 4,1.RHF is 350HV1,1.0MIN; 2.RHF be 350HV1,0.22MIN.
[specific embodiment]
Below the present invention is further illustrated.
Long measure is mm in this example, adopts Digit Control Machine Tool one-shot forming car to go out connecting rod client cylindrical connecting rod blank, this moment connecting rod total length L 1=311, the client total length is L4=25
-0.5, the client outer end is long by 7.5, client outer end diameter of phi 9.4, client gear hobbing diameter of phi 11.2;
Adopt Digit Control Machine Tool once-forming car to go out the connecting rod piston pin end cylindrical, this moment connecting rod total length L 1=310 ± 0.3, piston end length overall 28.5 ± 0.2, the staged cylindrical portion diameter at the middle part of piston end by left-to-right be respectively Φ 12.8 ± 0.1, Φ 9.5
-0.2, Φ 10
-0.1, the width of each ladder is 1.2
+ 0.2
Adopt Digit Control Machine Tool to cut groove, make length L 6=51.5 ± 0.3 of piston end, the fillet radius of curvature of groove is R=0.4 ± 0.1, and the groove diameter is Φ 13.5 ± 0.15, and slot slope is 15 ° ± 0.3 °;
CNC milling machine adopts from four sword slotting cutters of three Korea Spro's cutter companies customization and mills flat gesture, and 1500 rev/mins, milling flat gesture length is LT=12 ± 0.1, and width is 13 referring to Fig. 3
-0.1, the connecting rod bar portion top of nearly client is apart from length L D=20 ± 0.1 of milling the right top of flat gesture, symmetry 0.2B, tool changing behind 1500 connecting rods of the every processing of four sword slotting cutters;
The polishing of employing polishing machine makes rod surface bright and clean, no burr, non-trimming;
Adopt the screw-rolling machine gear hobbing, adopt screw-rolling machine respectively the gear hobbing portion at connecting rod two ends to be carried out gear hobbing, the client zone line is M12 for the client gear hobbing, length 14; The outer end of piston end is M10 for the piston end gear hobbing, and length is 12～13.5;
Quench: the electricity energy that frequently quenches is 2000～4000, quenching liquid pressure be 7+/-1.5bar, quench on connecting rod bar portion quench zone surface, make HRA 〉=70, RHT 350, HV1
Min1.0 the depth of quenching is 1.2, guarantees that milling flat gesture fillet place has enough quench hardened cases; Quenching reaches RHT 350, HVI at the flat gesture fillet of milling of connecting rod place
Min0.22;
Grinding: according to diameter, linearity need carry out grinding;
Chromium plating: according to french citroen standard B154120, chromium coating hardness min 900, HV0.05; Chromium coating thickness 〉=10micron; The chromium coating surface allows fine fisssure number＜1500r/m;
Tempering:, make HRA 〉=70 at connecting rod bar portion quench zone surface temper; RHT 350, HV1
Min1.0;
Carry out fine abrasive at last on demand.
Among the present invention, because the particularity of connecting rod milling potential structure, we have strengthened technical indicator, the hardness that the requirement of quenching reaches: HRA 〉=70, the depth of quenching is not less than 1.2mm on the face of cylinder of connecting rod, is not less than 0.22mm in the fillet place depth of quenching of milling flat gesture, in addition, when carrying out hardening step, adjusting the quenching energy is 2000～4000, the pressure of quenching liquid be 7+/-1.5bar.
By scheme among the above embodiment, we have produced the frock exemplar, have carried out following test, whether have solved problem to verify these schemes:
1, in the endurancing of french citroen operational vehicle simulated roadway, after test is finished, connecting rod cracking problem does not take place.
2, carried out connecting rod bending resistance fatigue test German saxophone, the result reaches specification requirement.
Therefore, above scheme has solved the problem of connecting rod cracking.
Claims (2)
1. the processing technology of a damper link is characterized in that: (1) adopts Digit Control Machine Tool one-shot forming car to go out connecting rod client cylindrical; (2) adopt Digit Control Machine Tool one-shot forming car to go out the connecting rod piston pin end cylindrical; (3) adopt Digit Control Machine Tool to cut groove; (4) CNC milling machine adopts four sword slotting cutters to mill flat gesture, 1500 rev/mins; (5) adopt the polishing machine polishing; (6) adopt the screw-rolling machine gear hobbing; (7) quench: the electricity energy that frequently quenches is 2000～4000, quenching liquid pressure be 7+/-1.5bar, quench on connecting rod bar portion quench zone surface, the depth of quenching is 1.2mm, HRA 〉=70, RHT 350, HV1
Min1.0; Quench at the flat gesture fillet of milling of connecting rod place, make RHT 350, HVI
Min0.22; (8) grinding: diameter, linearity; (9) chromium plating makes chromium coating hardness min.900, and HV 0.05; Chromium coating thickness 〉=10micron; Chrome-plated surface allows fine fisssure number＜1500r/m; (10) tempering: at connecting rod bar portion quench zone surface temper, 180 ℃, 1h makes HRA 〉=70; RHT 350, HV1
Min1.0; (11) fine abrasive.
2. the processing technology of a kind of damper link as claimed in claim 1 is characterized in that: tool changing behind 1500 connecting rods of the every processing of four sword slotting cutters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100230024A CN101780625B (en) | 2010-01-18 | 2010-01-18 | Processing technology for connecting rod of shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100230024A CN101780625B (en) | 2010-01-18 | 2010-01-18 | Processing technology for connecting rod of shock absorber |
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| Publication Number | Publication Date |
|---|---|
| CN101780625A true CN101780625A (en) | 2010-07-21 |
| CN101780625B CN101780625B (en) | 2011-09-07 |
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ID=42520831
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100230024A Active CN101780625B (en) | 2010-01-18 | 2010-01-18 | Processing technology for connecting rod of shock absorber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101972921A (en) * | 2010-11-09 | 2011-02-16 | 许昌远东传动轴股份有限公司 | Metalworking process of spline shaft fork of transmission shaft |
| CN103737020A (en) * | 2013-11-25 | 2014-04-23 | 哈尔滨汽轮机厂有限责任公司 | Turning method of outer circle of turbine main steam regulating valve stem made of high temperature alloy GH901 |
| CN104588981B (en) * | 2014-11-26 | 2016-08-17 | 江西洪都航空工业集团有限责任公司 | A kind of processing method of many cylinders buffer unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4319076A1 (en) * | 1992-06-08 | 1993-12-09 | Rhythm Corp | Manufacturing method for producing tie rods - involves producing untempered rod and the shaping to determined diameter and further shaping into differently shaped regions |
| CN101352795B (en) * | 2007-07-27 | 2010-10-06 | 云南西仪工业股份有限公司 | Method for processing fractured connecting rod for car engine |
| CN101444884B (en) * | 2008-12-18 | 2010-12-01 | 浙江跃进机械有限公司 | Machining process of engine connecting rod |
-
2010
- 2010-01-18 CN CN2010100230024A patent/CN101780625B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101972921A (en) * | 2010-11-09 | 2011-02-16 | 许昌远东传动轴股份有限公司 | Metalworking process of spline shaft fork of transmission shaft |
| CN103737020A (en) * | 2013-11-25 | 2014-04-23 | 哈尔滨汽轮机厂有限责任公司 | Turning method of outer circle of turbine main steam regulating valve stem made of high temperature alloy GH901 |
| CN103737020B (en) * | 2013-11-25 | 2016-08-17 | 哈尔滨汽轮机厂有限责任公司 | The method for turning of the steam turbine main steam control valve bar cylindrical of high temperature alloy GH901 material |
| CN104588981B (en) * | 2014-11-26 | 2016-08-17 | 江西洪都航空工业集团有限责任公司 | A kind of processing method of many cylinders buffer unit |
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| Publication number | Publication date |
|---|---|
| CN101780625B (en) | 2011-09-07 |
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