CN101941020B

CN101941020B - Piston rod finish-rolling device and processing process thereof

Info

Publication number: CN101941020B
Application number: CN2009100438937A
Authority: CN
Inventors: 王邵军; 朱健鸣
Original assignee: SHAOYANG TONGDA AUTO PARTS MANUFACTURING Co Ltd
Current assignee: SHAOYANG TONGDA AUTO PARTS MANUFACTURING Co Ltd
Priority date: 2009-07-07
Filing date: 2009-07-07
Publication date: 2012-04-25
Anticipated expiration: 2029-07-07
Also published as: CN101941020A

Abstract

The invention provides a piston rod finish-rolling device of an automobile gas spring and a processing process thereof, which is used for rolling the surface of a piston rod by utilizing a three-roller finish-rolling device and aims to solve the technical problems of reducing the processing flows of the piston rod, decreasing the processing cost and achieving the technical requirement of the surface roughness accuracy. The three-roller finish-rolling device is characterized in that: an upper fixed roller and a lower fixed roller are respectively assembled with three roller shafts and a key to form components which are then mounted into stand bearing holes, wherein the three rollers are distributed at an angle of 120 degrees; a front bearing and a rear bearing as well as a front bearing spacer and a rear bearing spacer which are provided with the three rollers and keep gaps with a stand are arranged on the roller shafts; and the assembled components are assembled on a slide plate capable of longitudinally moving. The processing process of the piston rod comprises the following steps of: mechanically processing, rough grinding before rolling, finely grinding, finishing, plating and polishing. By adopting the finish-rolling process technology, not only the procedure of finely grinding after plating is decreased, and the production cost and the equipment investment cost are reduced, but also the surface roughness of the piston rod in the finish-rolling process technology is improved, therefore, the economic benefits are increased.

Description

Piston rod finish rolling device and processing technology thereof

Technical field

The present invention relates to a kind of piston rod finish rolling device and processing technology thereof of gas spring for automobile.

Background technology

Main key component-the piston rod of air spring assembly, its surface quality requires smooth, and the surface roughness required precision is high, is generally Ra0.4 μ m-Ra0.2 μ m.Use traditional processing method, manufacturing procedure is many: correct grinding-plating (chromium plating) before the corase grind-plating before fine finishining-plating-plating back correct grinding-polishing.If by traditional method processing, when producing piston rod in enormous quantities, (1) abrasion of grinding wheel consumes excessive, often change emery wheel.(2) operative employee who require debugging, keeps in repair centerless grinder; Certain technical capability must be arranged; In case equipment fault occurs, the operative employee debugged adapteds such as the granularity, hardness of incorrect or emery wheel not at that time, and piston rod surface is prone to mechanical damages such as decorative pattern, scuffing, prismatic.When (4) electroplating, must thickness of coating be reached 50 μ m-70 μ m, enough stock removals arranged when finish grinding to guarantee the plating back.(5) several centerless grinders must be dropped into, the processing quantity of part could be guaranteed like this.Production cost is higher.

Summary of the invention

The objective of the invention is to design a kind of surface roughness precision that can improve piston rod; Piston rod is after finish rolling; Its surface roughness is between the Ra0.07 μ m-Ra0.05 μ m, and smart rugosity precision is considerably beyond piston rod finish rolling device and the processing technology thereof of the surface roughness Ra0.4 μ m-Ra0.2 μ m that requires of piston rod.

Concrete technical scheme is achieved in that finish rolling device of the present invention is that three roller finish rolling devices revolve with about 20-30Mpa high pressure with the piston rod surface in three pairs of rollers rotations that are 120 degree distributions; Make its pointwise metal flow production plastic deformation; Protruding peak the rolling of metal surface through roller; And slide to trench, the surface trend smoothly forms the fine and close metallic crystal institutional framework of one deck on the other hand, this show combine metal extruding, stretching, rolling, the forming technology characteristics such as roll.Comprise rotary power head (1), connecting rod (2), two fixed idler whells, adjustment rollers all link to each other with three roller shafts, keys, are respectively charged in the rack bearing hole again, and three rollers are 120 degree and distribute; Be provided with bearing, fore bearing spacer ring and rear bearing spacer ring before and after on roller shaft and be provided with three rollers and the preceding spacer ring in frame maintenance gap and back spacer ring; Assembly is contained on the slide carriage that can vertically move, and fixed idler whell, adjustment roller are along with the power because of rotary power head output rotates piston rod; Whole finish rolling device is on two fixed idler whells up and down on the frame, adjustment roller; The processing technology of piston rod is: the preceding corase grind of machined-roll-roll preceding correct grinding-finish rolling-plating-polishing; Wherein the finish rolling device requires to the output speed of rotary power head is 1200-1500n/r the piston rod finish-rolling process, and the speed that slide carriage vertically moves is 20mm-30mm/s; Wherein the operation of finish rolling is: a: three roller finish rolling devices are installed in one have on the lathe of rotary power head; B: a debugging bar is spun on the connecting rod; C: will adjust roller and move radially, and press piston rod, fixing then adjustment roller; D: the slide carriage on the lathe placed vertically move on the position; E: start rotary power head, three roller finish rolling devices are along with slide carriage vertically moves, and three rollers also along with the rotary power by rotary power head output, rotate through connecting rod, piston rod more simultaneously; F: slide carriage is placed disengaged position, screw out piston rod.

Advantage of the present invention is: 1, these three roller finish rolling apparatus structures are simple, and it is convenient to operate, debug, and cost of manufacture is lower.Rolling scope: Ф 8-Ф 30.2, piston rod through finish rolling after, need not plate this operation of back correct grinding, the coarse precision of the piston rod surface after the plating is higher, the production cycle shortens in a large number.3, processing cost reduces.4, the piston rod surface roughness improves, to reach quality requirement.5, do not need fine grinding technology just can directly polish.

Description of drawings

Fig. 1 looks the internal structure sketch map for the master of three roller finish rolling devices of the present invention;

Fig. 2 is the right TV structure sketch map of three roller finish rolling devices of the present invention.

Each several part number order and title are following in the accompanying drawing:

1, rotary power head, 2, connecting rod, 3, piston rod, 4, front shroud, 5, the fore bearing spacer ring, 6, bearing; 7, preceding spacer ring, 8, fixed idler whell, 9, roller shaft, 10, key, 11, back shroud; 12, back spacer ring, 13, the rear bearing spacer ring, 14, slide carriage, 15, frame, 16, the adjustment roller.

The specific embodiment

Embodiment 1:

Like Fig. 1, shown in 2, the finish rolling device mainly contains two fixed idler whells 8.Wherein adjust roller 16 and form assembly with three roller shafts 9, key 10 respectively, be respectively charged in frame 15 dead eyes again, three rollers are 120 ° of distributions; Be provided with two bearings 6 and fore bearing spacer ring 5 before and after on roller shaft 9 and be provided with three rollers and the preceding spacer ring 7 in frame 15 maintenance gaps, back spacer ring 12, rear bearing spacer ring 13 refills above component-assembled on the slide carriage that can vertically move 14 after good.The processing technology of piston rod is: the preceding corase grind of machined-roll-roll preceding correct grinding-finish rolling-plating-polishing.Wherein finish rolling operation is: 1. three roller finish rolling devices are installed in one and have on the lathe of rotary power head 1 (comprising guide rail, slide carriage 14 and slip crate are arranged); 2. a debugging bar (with the same size of piston rod external diameter of being processed, the also available piston rod that has rolled preceding correct grinding) is spun on the connecting rod 2; 3. will adjust roller 16 and move radially, press piston rod 3, fixing then adjustment roller 16; 4. the slide carriage on the lathe 14 is placed and vertically move on the position; 5. start rotary power head 1, three roller finish rolling device along with slide carriage 14 vertically moves (in the direction of arrows), three rollers also along with the rotary power by rotary power head 1 output, rotate through connecting rod 2, piston rod 3 more simultaneously; 6. slide carriage 14 is placed disengaged position, screw out piston rod 3.Wherein the specification requirement of rolling preceding fine grinding technology of piston rod will reach rough surface precision Ra0.4～0.2; Linearity 0.02mm/300mm; There are not mechanical defects such as scuffing, decorative pattern; Diameter tolerance-0.045～-0.050.Use three roller finish rolling devices to the technological requirement of piston rod finish rolling operation output speed-1200-1500n/r as rotary power head (1); The speed (mill speed) that slide carriage (14) vertically moves is 20mm～30mm/s, and the surface roughness precision of finish rolling back piston bar is Ra0.1-0.05.After the plating, diameter tolerance is-0.013～-0.035; Surface roughness precision Ra0.4～0.2.Polishing is to reach surface roughness precision Ra0.2.

Claims

1. piston rod finish rolling device; Comprise rotary power head (1), connecting rod (2); It is characterized in that: two fixed idler whells (8), adjustment roller (16) all link to each other with three roller shafts (9), key (10), are respectively charged in frame (15) dead eye again, and three rollers are 120 degree and distribute; Be provided with bearing (6), fore bearing spacer ring (5) and rear bearing spacer ring (13) before and after on roller shaft and be provided with three rollers and the preceding spacer ring (7) in frame maintenance gap and back spacer ring (12); Assembly is contained on the slide carriage (14) that can vertically move, and fixed idler whell (8), adjustment roller (16) are along with the power because of rotary power head (1) output rotates piston rod (3).

2. piston rod processing technology that adopts the described piston rod finish rolling of claim 1 device; It is characterized in that: the processing technology of piston rod is: the preceding corase grind of machined-roll-roll preceding correct grinding-finish rolling-plating-polishing; Wherein the piston rod finish-rolling process is required the output speed for rotary power head (1) is 1200-1500n/r to the finish rolling device, and the speed that slide carriage (14) vertically moves is 20mm-30mm/s; Wherein the operation of finish rolling is: a: three roller finish rolling devices are installed in one have on the lathe of rotary power head (1); B: the piston rod of correct grinding is spun on the connecting rod (2) before will rolling; C: will adjust roller (16) and move radially, and press piston rod (3), fixing then adjustment roller (16); D: the slide carriage on the lathe (14) placed vertically move on the position; E: start rotary power head (1), three roller finish rolling devices are along with slide carriage (14) vertically moves, and three rollers also along with the rotary power by rotary power head (1) output, rotate through connecting rod (2), piston rod (3) more simultaneously; F: slide carriage (14) is placed disengaged position, screw out piston rod (3).