Numerical control is changed transform radial drilling machine in order to machine large tube plate kind spare parts

Worm bracket 2.

Tab 3.

Worm 4.

Worm wheel 5.

Workbench 6.

Plastic slideway 7.

Baseplate 8.

Bearing 9.

318200 bearing 10, 16.

Gland with 11.

Bearing 12, 14.

Nut 13.

Spacer 15.

Upper cover 17.

Main shaft 18.

Bottom horn 19.

Block oil board to pursue the purpose that 31 numerical control transform the development that waits for an industry as project of petro-chemical, heat energy, tube plate kind the treatment demand of the spare parts is increasing, the demand is higher and higher. If heat exchanger tube plate is mixed,fold stream board on auger have many opening (the biggest diameter of tube plate makes an appointment with 2m, kong Shu makes an appointment with 3000, typical workpiece shows) 1 times like the graph, so that cross heat exchanger tube. To make heat exchanger tube inserts tube plate smoothly, ask every aperture has certain dimension precision not only, the mutual position precision that more important is Kong Jian (the error asks to be commonly 0.

05mm controls) . Machine tube plate before, fold stream board technological process is: Underline, hit ocean to rush, hit heart hole, examine bore. This kind of method works not only intensity every much, treatment needs big, working procedure more than 100 man-hour, and treatment precision is low, often give late heat exchanger tube to insert do not eat tube plate, fold stream board, cause workpiece to discard as useless with do poorly done work over again. The treatment of numerical control machine tool that uses high accuracy, tall automation accordingly is imperative already. But purchase machine tool of special and large numerical control or the name of a river in Shaanxi and Henan provinces of machining center price costly, if show the plant some average radial drilling machine (like Z3063 model) undertake counting accusing to change transforming, it is a charge the plan with low, fast, practical yield results. The 2 firm grounds that transform program layout of radial drilling machine, be about to machine spare parts of this kind of tube plate, the aspect that should control drilling machine main shaft to walk out of every treatment aperture only can, for this rectangular coordinates controls means and fashion of polar coordinates control two kinds transform program. Hind structure of a kind of plan is compact, size range of pipe bent can make full use of (the circumgyrate as a result of numerical control revolving stage, y of expand into of its size range of pipe bent the one times) to the journey. Should tag the dimension of the aperture in blueprint only from polar coordinates of rectangular coordinates translate into can, this is extremely simple thing for use computer to nowadays, be used consequently. Change via numerical control of affirmatory radial drilling machine transform plan to see graph 2. Specific transform measure to be as follows. Change main shaft box to be drive of ball guide screw in means of the shift on rocker, by servo electromotor drive (X axis) ; increases workbench of circumgyrate of a numerical control (C axis) ; locking rocker, make line of axes of drilling machine main shaft and line of axes of stage of numerical control circumgyrate are on same plane. The structural characteristic of radial drilling machine of the 3 numerical control after transforming is large workbench of numerical control circumgyrate (C axis) the mesa diameter that designs workbench of numerical control circumgyrate is 2m, by synchronism of classics of drive of communication servo electromotor belt annulus is mixed deputy drive of worm of a pair of accurate worm wheel, make workbench can circle him axes accurately circumgyrate, its structure is shown 3 times like the graph. To assure the transmission precision with numerical control taller workbench and stiffness, designing following technical step are taken in making. Slideway and volume of bearing circumgyrate workbench are large (diametical 2m) , weight is great (revolving stage roll makes an appointment with 2t) again partly, its susceptive is gotten cut axial muscularity, attrition pressure is great also. To make sure workbench circumgyrate is accurate, acute, smooth, stickup YT gets together on its circle slideway soft belt of slideway of 4 fluorine ethylene, journal bearing used nicety 3182100 model biserial roller bearing and 7000 model tapered roller bearing. Classics practice use result is favorable, accord with design requirement. The selects workbench transmission system key of transmission component is accurate ground passes motion, is not to transfer power. Because this transmission system uses deputy transmission of synchronous belt and worm of large and accurate worm wheel, use adjust spacer (the center that 3) seeing a picture will come to adjust worm wheel worm is apart from, the drive that eliminates worm wheel worm thereby asks unoccupied place. Because workbench diameter is big,servo electromotor reachs the choice of driver, weight is great, ask the servo drive electromotor of workbench wants to have not only enough big torsion, more important is to should have tall servo precision and stiffness, the graduation precision that just can assure revolving stage so and by the fixed position precision of treatment aperture. The SF352(B that via designing computation to use Japan certainly company of 3 water chestnut produces) high-power of half closed circuit communicates high-powered, wide timing servo electromotor drive. Its technology parameter is as follows: The driver type that matchs is MR-J2-350A, rated output power is 3.

Torsion of 5kW rated output is 167N · M, the biggest torsion 50.

1N · M, the biggest rotate speed is 2500r/min. The resolution of coder is 16384 pulse / R. This servo can stir the gain that adjusts a system in real time in vain, cooperate electromotor and load automatically to make the system achieves the set of optimization thereby. Because adopt above 3 measure, make the installation of numerical control revolving stage is debugged extremely convenient, its function index not appearance achieves design requirement, and imagine formerly more than. Classics actual measurement, the repetition of numerical control revolving stage locates precision is achieved 0.

The) on 01mm(2m diameter. Smooth sex and answer ability to also be not constant ideal quickly. The shift of rocker of edge of box of drilling machine main shaft (X axis) be opposite according to the transmission precision of this axis the influence of the fixed position precision of aperture, the precision that considers work integratedly asks to reach economy, this axis uses a pace to take deputy drive of electromotor and ball guide screw. Via designing computation, use inside guide screw of ball of double flange of circular float type (model is FF5005-5) , and 130BC3100A pace enters electromotor (M of · of retentivity quadrature Mjmax=20N, qb=0 of step pitch horn.

6 ° , fmax=15kHz) of empty running frequency, contain between electromotor and guide screw reducer casing (I=1.

2) , the biggest move quickly speed 3m/min. Design a requirement via making actually give out to be achieved completely. The fluctuation feed of main shaft moves (Z axis) the fluctuation of main shaft moves (Z axis) spend with the Lai that cuts at control getting, for this, the transmission catenary that answers main shaft box undertakes be modificationed certainly, regard drive as the source into electromotor by the pace, use at controlling Z axis feed. The pulse equivalent of Z axis is right now adjacent 0.

01mm, the axial force of Z axis is 10600N, reach the target of the axial force of primary machine tool. The premise that the control system of this machine tool asks in contented treatment issues system of control of 4 personal computer and interface circuit to set out from economic angle. Use pattern plate of homebred STD bus line to build make and become. Its CPU is 8088, have RS232 serial opening, can correspond with the PC, undertake be machininged directly controlling (DNC function) . Deserve to have video of 9 inches of CRT, undertake full screen edits machine program and graph to show. Systematic block diagram is shown 4 times like the graph. Graph 4 graphs the 5 output that what should allude particularly is this systematic control axis are instruction pulse signal and directional signal, and what amplifier of servo of 3 water chestnut receives is mixing to pulse alignment signal of retrorse pulse alignment, both do not match. To make both match, the interface circuit that if the graph is shown 5 times,designed. Via be being used actually, the job is reliable, the effect is better. Graph because be machined,work out of 65 machine program and computer assist process designing tube plate kind the Kong Shu of the spare parts is very much, and the type often also changes, if apply process designing of handiwork of code of ISO numerical control directly, be calculated and process designing workload is very big, also make mistake easily, it is very difficult to once make mistake,be checked. Accordingly, the decision is right by treatment tube plate kind the spare parts builds mathematical model, use C language to write general purpose program to create machine program automatically (program flow chart is like graph 6) . Pass communication interface of data of RS-232 of transmission software classics to convey by the PC when need machines this spare parts numerical control system, can undertake machining. The fact explains this is the method of machine program of a kind of very handy and effective automatic work out. Numerical control of this radial drilling machine changes 6 treatment test and conclusion transform after finishing, via detecting each precision index and function all achieve design requirement. Its blame axial repetition locates precision is O.

01mm, fixed position precision is 0.

02mm; C axis repeats fixed position precision to amount to 00.

1mm(is on 2m diameter) fixed position precision is amounted to 0.

035mm(is on 2m diameter) . Two aperture machine random error of the largest fixed position is span ± 0.

05mm. Classics works uses a proof actually, stability of this machine tool function, precision tall, operation is convenient, produce efficiency to rise greatly especially, machine a tube plate formerly kind the spare parts needs more than 100 man-hour, need intensity of labor of more than 10 man-hour to also get huge is reduced only now. This numerical control changes transforming is a success, can machine tube plate for industry of engineering of petro-chemical, heat energy kind of the spare parts draw lessons from. CNC Milling