1, tube plate of tube plate processing technique is applied extensively at the industry such as petrifaction, boiler, refrigeration, turbine, and tube plate treatment is the important process that heat exchanger makes, very important place is had in the production of heat exchanger. The precision that tube plate machines, provide opening especially span and tubal diameter public errand, verticality, bright and clean spend what affect heat exchanger greatly to assemble with performance characteristics. As chemical equipment, power station large change, diameter of its heat exchanger also becomes bigger and bigger, the tube plate that the diameter is 4m ～ 5m is very common, some diameters achieve 7m left and right sides. The characteristic of large tube plate is to be in charge of Kong Shu to measure much, close, aperture small, deep, precision and bright and clean degree of demand is high, this raised very tall requirement to the treatment of tube plate. 2, method of traditional tube plate treatment although the treatment craft of each manufacturer somewhat difference, but as a whole, nothing more than, underline first (become reseau state because of the line of lay off, call reseau the line) , draw a design is bit stronger, get alveolus with bradawl head, again formal bore, if hole wall is bright and clean degree of demand is high, even aperture of bore with a reamer, pour wine cup finally. Analyse this to cover process, say to underline first, if standard tube plate (beehive shape) say fortunately, if the graph is complex, underline very give or take a lot of trouble. Say bore again, jockey person gets bore with rocker, adjust rocker fixed position, fall again head of run the drilling tool into the well, raise fixed position of broach readjust rocker again, get an aperture to want to make several motions, and the labor strength of jockey person is greater, efficiency is not tall. Altogether, traditional tube plate machines a method, precision is low, take time, arduous, make tube plate treatment becomes a bottleneck in whole production process, mention tube plate treatment, people frowns continuously. 3, advanced tube plate machines a method actually, a when restrict tube plate treatment main problem is equipment issue. In conventional tube plate treatment, rocker getting is his main facility. Because its hand uses operation character, operation method is fixedder, have latent capacity mining very hard. Although can use the method such as jig to improve efficiency, but cannot solve basic problem. Think way from equipment only, ability from go up at all solve a problem. Treatment of foreign canal aperture uses drilling machine of much axis numerical control generally already, use rocker to get no longer, planar drilling machine can replace numerical control to be underlined artificially, bore, can improve treatment precision and efficiency greatly. What our country also begins to realize this kind of drilling machine in last few years is homebred change, but the product of most manufacturer, lathe bed is lesser (2m~3m) , main shaft (1 or two) not much. Cannot machine large tube plate. Cannot replace entrance product completely. Because this machines the large tube plate with tall precision to the requirement (exceed 7m) , can be machined only abroad. And number of feed inlet charges a machine tool, the price is high, installation cycle is long, maintain not easily, do not fit Chinese national condition certainly. Production of manufacturer of machine tool of urgent need home gives people exceed drilling machine of large numerical control, in order to satisfy the need of manufacturer of tube plate treatment. 4, homebred the factor of applied Shandong law in exceeding drilling machine of large numerical control to be machined in tube plate controls mechanical limited company is a manufacturer that devotes oneself to research and development of numerical control machine tool, production, since since development exceeded PD4040A/4 of drilling machine of large numerical control the first times successfully 2003, technical day attain mature, had produced a few to exceed drilling machine of large numerical control, distributing at countrywide each district. Some users, purchased two to exceed drilling machine of large numerical control because of numerical control from the law. Drilling machine of this kind of numerical control, use structure of movable type of head dragon door, much main shaft (2 to 12 main shaft) , when the user is ordering goods, how many of the size that chooses workbench side by oneself and main shaft. The largest size that can process work can achieve 7m × 7m (according to need, producible treatment is bigger the machine tool of tube plate) . Its mainstream product is the PD4040 that machines 4m of × of 4m of the largest size × that reach 7m 4. The PD7045 of 5m, use 4 main shaft commonly, type of slip of 4 numerical control is gotten cut head, can become independent numerical control is mobile, the smallest span of head is 500mm left and right sides, diameter of bore of one-time the biggest sincere is Φ 50mm (optional) , 200mm of ply of the workpiece that hold clip is controlled (optional) , 0 tine are unoccupied place double-faced drive, overall have axis of 10 numerical control (optional) , have CAD/CAM to change a course automatically, can change into machine program with CAD file already, can use manual process designing again, can have the aperture of numerical control bore, reaming, bore with a reamer, treatment that pours the working procedure such as horn. Omited thereby underline artificially, need not reoccupy handiwork bore, make tube plate processing technique had a qualitative flight. Rose to machine precision and manufacturing efficiency greatly. Because its are efficient, make the work that ability of a month completes before, a few days can be finished now. Comb-out the bottleneck that machines in the tube plate in whole production process. 5, the standard of specific use means that exceeds drilling machine of large numerical control exceeds large drilling machine to use PC(computer because of what numerical control produces) + CNC(numerical control is unit) + PLC(can make up Cheng controller) control mode. The CAD graph of tube plate is inputted in PC, change into DXF file next, run what the law develops independently because of numerical control to go up next a machine software, open this DXF file, input the datum mark coordinate of workpiece, can make part program and part program news automatically. Part program is generated by the machine, prevented the situation that part program of artificial work out makes mistake easily. Next, pass into part program through the communication software WINDNC between PC and CNC CNC, undertake machining from part program of the v in CNC next. Carry the news report between PC and PLC, the moving state of monitoring machine. (6) it is one gets the example that cuts part program below: % , MX, n0001Z2700.
000N0002X1360.
000Y2640.
000U720.
000V2000.
000N0003(B0, c0, d1, e0)N0004M55N0005Z2000.
000N0006X1360.
000Y2640.
000U720.
000V2000.
000N0007(B0, c0, d1, e0)N0008M55N0009X1400.
000Y3040.
000U720.
000V2400.
000N0010(B0, c1, d1, e0)N0011M55N0012Z1500.
000N0013X1360.
000Y3040.
000U720.
000V2000.
000N0014(B0, c0, d1, e0)N0015M55N0016M30 (7) the example that is information of a part program below: 1.
Process designing method: CAD2.
The file of processing: D:PD4040BDXF3270f30.
Dxf3.
Eliminate weighs aperture: 04.
Bore gross: 55005.
Bore gross desired result: 55006.
1# , 2# , 3# , 4# bore counts: 12391428155912747.
Head leisure time: 10208.
Head utilization rate: 84.
36%9.
Drilling unit counts: 163010.
Bore diameter: 30.
00011.
Tube plate diameter: 3270.
00012.
The platoon of aperture counts: 9313.
The order is final serial number: N498414.
Datum mark coordinate (U):2000.
00015.
Datum mark coordinate (Z):2000.
00016.
Way of Z axis movement: to 17.
Tube plate type: Standard 18.
The hour that the program handles: 2005-2-312:49:44 examine part program information, can undertake an analysis to part program, reduce the chance that make mistake. 6, summary is chosen correctly exceed drilling machine of large numerical control, it is the only way that improves efficiency of treatment precision, production. Investment of as soon as possible is used exceed drilling machine of large numerical control, quality of expensive to carrying product, increase numerical control of the content of product science and technology, competition ability that enhances a business, education to apply a talent to have active sense. CNC Milling
CNC Machining