Special fixture of machining center of many spare partses designs milling

03mm) for this spare parts treatment weighs difficulty, the place precision hard the palm accuses, treatment efficiency is low, because this must design special fixture, raise its precision to be able to machine many spare partses at the same time. 2, treatment prepares 　 2.

1 choose treatment fiducial if pursue,1 block diagram is shown, indicative A, B, C, D4 face, treatment weighs difficulty to be the treatment place between AB face (8 ± 0.

03mm) , except treatment dimension asks taller outside its surface roughness asks to be Ra1.

6, when datum plane is being chosen in designing clamping apparatus process to reach treatment level, ask its are had relatively high accuracy, because this chooses CD,face of Kong Weihe D regards Bencijia as labour between the face fiducial, be in next this is fiducial is opposite the spare parts undertakes machining. 2.

2 choose the treatment place between face of AB of 　 of treatment machine tool, cutting tool (8 ± 0.

03mm, surface roughness asks to be Ra1.

6) ask to choose machining center or CNC Milling to obtain treatment. To vertical machining center character, the machine tool can undertake bosseyed milling only in treatment, and because machine exercise to bear,its contrary is met greater stress, cause machining error, cannot achieve anticipate treatment precision. And handling time is longer, manufacturing efficiency is low. Horizontal machining center is had but at the same time milling the advantage of many parallel face, and treatment process is smooth, reliability is higher, because this chooses horizontal machining center. State of the job in combining horizontal to machine and requirement of spare parts treatment choose 3 blade milling cutter to regard treatment as cutting tool. 3, the spare parts machines 　 (1) certain part semifinished product makes a form. Hardware data is HT200. Means of combinative part treatment and hear a case, bigger load or wallop can appear in process of spare parts treatment, because this chooses to fight the forging with bigger impact, reduce the metallic fiber loss in treatment, assure dependability of spare parts job. Be based on spare parts demand bigger, need to realize large quantities of quantities to machine production, and dimension of this spare parts is lesser, because this chooses sand mold to cast means, this kinds cast means to be able to reduce manufacturing cost not only, still can improve spare parts performance, can assure productivity and treatment quality. (2) certain treatment tool reference plane. Treatment is standard can divide for thick fiducial with essence of life fiducial. Wide fiducial selection is as follows: Treatment serves as D face when undertaking A face is machined thick fiducial, regard auxiliary treatment as datum plane B face. When undertaking B face is machined, serve as C face thick fiducial, serve as A face auxiliary and fiducial. Fine datum plane chooses as follows: Face of the C when regarding finish machining as the face with face of A, B, D is fiducial. (3) technological process. Assure technological process is quality of treatment spare parts at all, spare parts dimension, precision should assure to wait to all be achieved when making technological process expect an end, in assure to machine quality while promotion is produced can. To large quantities of quantities manufacturing spare parts can make special fixture, implementation working procedure centralizes production. Make this spare parts machine craft to be according to this standard: Cast -- Qing Dynasty is arenaceous -- heat treatment -- besmear is brushed -- face of milling C, D -- face of milling A, B. 4, lever arm clamping apparatus designs this project clamping apparatus to include a part to be respectively: Component of fixed position component, clamping apparatus main body, join, right knife device and oriented device, clamping unit, plus other component. Will see fixed position from working character component, clamping unit, right knife device and oriented device are Bencizhi provide design focal point. Premise of this clamping apparatus design is not to affect treatment precision, in make sure treatment raises his to yield on quality base. 4.

1 design locates plan links structure of this spare parts and demand, if the graph shows blueprint 2 times,design on the foundation that assures to machine quality. The graph pursues on union of blueprint of component of 2 fixed position fixed position of itself of clamping apparatus of analysis of blueprint of fixed position component: Motherboard of clamping apparatus body gives a link to have T look piece, through this structure this structure can join to machine tool slideway, the U that goes up through floor of clamping apparatus component chamfer has fixed position to clamping apparatus body. To the work location on XY direction: By the graph ψ exists between face of knowable C, D the aperture of 28, through this aperture fixed position of a flight of stairs that hold clip is sold can come true to be in to workpiece the fixed position of XY direction. If the graph shows fixed position 2 times to sell,with clamping apparatus brace aperture cooperates effectively, some answer to had been made in cooperating a process be filled with cooperate, after preventing spare parts treatment to finish, take bring about fixed position to sell drop. ψ after the aperture of 28 locates namely shift of direction of demarcate workpiece XY and rotational freedom are spent, mobile freedom spends Y direction to also be restricted. Y direction turns freedom spends demarcate: Already right when the fixed position that goes up in XY direction to workpiece, y direction shift is spent freely undertake limitative, because this wants rotational to its way only,have limit can. Those who join appearance to be echelon is measure to work overtime in workpiece, press a both sides to apply thrust augmentation to realize Y axis to turn freedom is spent to drifting. Locate the error analyses: The deviation on its is set of 28H8 of ψ of treatment component aperture 0.

02mm, the deviation below ψ 28h7 is - 0.

01mm, fiducial displacement error is Δ Y=0.

015mm, these data satisfy design requirement. Because the design is standard as fiducial as fixed position coincide, because this is fiducial the part is standard not coincide error is 0. 4.

This clamping apparatus devises 2 clamp plan the target is not to affect treatment precision, in make sure treatment raises his to yield on quality base. In the light of this treatment design of spare parts dimension machines an amount to be 6 at the same time, because how this assures,machine 6 at the same time and do not affect treatment quality to make research focal point. Clip installs means to measure pressing plate of screw join screw type for X direction, add many sheeting to raise spare parts clamp to spend between 6 spare partses. One slideway slot opens in screw a side, sell through spacing circumstance of force lean to one side appears in avoiding screw clamp process surely. Suffer force to add balancing pole between the spare parts equably to assure a spare parts additionally, improve the balance of manage thereby, assure to machine quality. To machining clamp of direction of Y of 6 spare partses at the same time when, use rotate pressure piece will come true. The structure is Hua Zhu + fluidity is plastic. 4.

Principle of fixed position of principle of job of 3 clamping apparatus: Workpiece reachs C face to be located in fixed position to sell surely with aperture 2, in the design fixed position is sold with aperture transition fit. Number 7 nut and pressing plate 5 pass Hua Zhu 3 clamp, fluidity is among plastic. Screw 4 with pressing plate 5 need treatment part with 6 through sheeting to bearing piece 8 impaction. Principle of clamping apparatus job: Machining a spare parts is, nut 7 meetings are loose, rotate later pressure piece 6 reach Hua Zhu 3 meetings are stretched, put the part park fixed position to sell right now 2, cooperate to secure 6 spare partses clamp through the component such as pressing plate, nut, Hua Zhu. Install a knife of the outfit after ending to be able to begin to machine a spare parts to the knife. 5, current milling clamping apparatus designs the last word is not to affect treatment precision, make sure treatment raises his to yield on quality base. Clamp plan and treatment program are paid attention to in clamping apparatus design, for machining center Gao Zhigao measures production to lay a foundation. CNC Milling