Special deep hole drilling machine for deep hole coefficient control deep hole machining of nuclear spent fuel storage and transportation containerTechnical Field
The invention belongs to the field of processing equipment, and particularly relates to a special deep hole drilling machine for deep hole coefficient control deep hole processing of a nuclear spent fuel storage and transportation container.
Background
Nuclear environmental safety is an important component of nuclear safety and is a precondition for sustainable and healthy development of the nuclear industry. So that there is a considerable demand in the technical field of the treatment of nuclear waste. The development of nuclear spent fuel storage and transportation containers is a difficult problem in the field of nuclear safety and nuclear environmental protection. The conventional nuclear spent fuel storage and transportation container cannot be produced in China and depends on import, enterprises try to process by adopting traditional equipment in China, and then a plurality of large horizontal lathes, large milling and boring machines, large deep hole boring lathes, large deep hole drilling machines and the like are required, and the clamping processing is replaced for multiple times, so that the efficiency is low and the precision is difficult to guarantee. For example, a spent fuel storage and transportation container is large in size and high in required precision, the diameter range phi 1500-3000 mm is larger than 150t, a circle of deep holes are formed in the circumference of the storage and transportation container and are used for installing a sensor for monitoring the temperature, the hole depth reaches 6000 mm and has a degree requirement (for example, one hole degree is 17 DEG 8'34' '), so that the hole depth can be solved by a special deep hole drilling machine, and a higher-precision indexing device is needed for the hole position degree. The common processing method is to arrange a C-axis indexing gear transmission shaft in a main shaft box, but because the diameter of the storage and transportation container is larger, if the C-axis indexing is added in the main shaft box, the structure in the main shaft box is greatly complicated, and the processing cost and unnecessary waste are increased.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the special deep hole drilling machine for deep hole coefficient control deep hole machining of the nuclear spent fuel storage and transportation container, which adopts the workpiece indexing center frame to control the radial rotation of the workpiece so as to realize C-axis indexing, has a simple structure, adopts BTA (internal chip removal) mode deep hole machining, and has high machining efficiency, high precision and low machining cost for circumferential holes.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The special deep hole drilling machine for deep hole coefficient control deep hole machining of the nuclear spent fuel storage and transportation container comprises a drill rod lathe bed and a workpiece lathe bed which are of high and low structures, wherein a workpiece indexing center frame feeding device and a workpiece supporting center frame are arranged on the workpiece lathe bed, the workpiece supporting center frame is close to the drill rod lathe bed, a workpiece support and a workpiece indexing center frame are arranged on the workpiece indexing center frame feeding device, the workpiece support is positioned on one side, far away from the drill rod lathe bed, of the workpiece indexing center frame, and the workpiece support and the workpiece indexing center frame can move in the Z direction under the driving of the workpiece indexing center frame feeding device; the workpiece indexing center frame comprises a workpiece indexing center frame base, a first motor reducer, a first double-ended screw rod, two sets of workpiece indexing center frame carrier rollers and two main indexing drive motors, wherein the workpiece indexing center frame base is positioned on a workpiece lathe bed and a workpiece indexing center frame feeding device, the first double-ended screw rod is transversely arranged on the workpiece indexing center frame base, two sets of workpiece indexing center frame carrier rollers are symmetrically arranged on the first double-ended screw rod, the first motor reducer drives the first double-ended screw rod to positively rotate or reversely rotate so as to synchronously and reversely move the two sets of workpiece indexing center frame carrier rollers, the workpiece indexing center frame carrier rollers comprise a first carrier roller bracket, a rotating shaft and a first roller, the first carrier roller bracket is positioned on the workpiece indexing center frame base and the first double-ended screw rod, the top of the first carrier roller bracket is provided with the first roller, the rotating shaft is sleeved in the first roller and connected with the main indexing drive motors, the main indexing drive motors drive the rotating shafts to drive the first roller to rotate together, the workpiece support center frame comprises a workpiece support center frame base, a second motor reducer, a second double-ended screw rod and two sets of workpiece support center frame carrier rollers, the workpiece support center frame base is fixed on a workpiece lathe bed, a second double-head lead screw is transversely arranged on a workpiece support center frame base, two sets of workpiece support center frame carrier rollers are symmetrically arranged on the second double-head lead screw, a second motor reducer drives the second double-head lead screw to rotate forward or reversely so that the two sets of workpiece support center frame carrier rollers synchronously move reversely, a workpiece is placed on the two sets of workpiece indexing center frame carrier rollers and the two sets of workpiece support center frame carrier rollers, a workpiece support abuts against one end of the workpiece far away from the drill rod lathe bed, a drill rod box feeding motor and a Z-direction arranged first guide rail are arranged on the drill rod lathe bed, the drill rod box feeding motor drives the drill rod box to move along the first guide rail, a guide center frame is arranged at one end of the drill rod lathe bed close to the workpiece lathe bed, an oil feeder is arranged on the guide center frame, a drill rod box main motor is arranged on the drill rod box, the tail end of the drill rod is inserted into the drill rod box, the drill rod is driven by the drill rod box main motor to rotate, the front end of the drill rod passes through a plurality of movable supports on the first guide rails and then passes through the guide center frame to be aligned with the workpiece, and one side of the lathe bed is provided with an iron filings conveyer and a cooling liquid circulating water tank.
The workpiece indexing center frame feeding device comprises a second guide rail arranged on the workpiece lathe body in the Z direction and a driving motor for driving the workpiece support and the workpiece indexing center frame to move along the second guide rail.
And a feedback circular grating for measuring the rotation angle of the workpiece is arranged on the workpiece support.
And an encoder for feedback compensation of the rotation angle of the workpiece is arranged at the center of the workpiece.
The workpiece support center frame carrier roller comprises a second carrier roller bracket and a second roller, the second carrier roller bracket is positioned on the workpiece support center frame base and the second double-head screw rod, and the second roller is arranged at the top of the second carrier roller bracket.
The bottom of the drill rod lathe bed is provided with a drill rod lathe bed lifting mechanism for adjusting the height of the drill rod lathe bed.
And a drill rod support is arranged on one side, far away from the workpiece lathe bed, of the guide center frame, and a drill rod damping sleeve is arranged on the drill rod support.
The applicable maximum workpiece machining diameter R1 is 3000mm, and the minimum workpiece machining diameter R2 is 1500mm.
The special deep hole drilling machine for deep hole coefficient control deep hole machining of the nuclear spent fuel storage and transportation container has the advantages that the workpiece indexing center frame is used for controlling radial rotation of a workpiece, the first roller is driven to rotate by the main indexing driving motor to drive the workpiece to rotate, C-axis fine indexing of the workpiece is achieved, the distance between the two first rollers and the distance between the two second rollers are adjusted by the first motor reducer and the second motor reducer, adjustment of machining hole positions on different circumferences of the workpiece can be achieved, and compared with the fact that C-axis indexing is added in a spindle box, the special deep hole drilling machine is simple in structure and low in cost. Because the diameter of the workpiece is large, the depth of each hole of the machined hole is deep, the precision of the machined hole is high, the centering, alignment and precision indexing can be completed by one-time clamping, the requirements of 96 deep hole machining precision on two circumference indexing circles are met, and the production efficiency is greatly improved. The invention adopts the BTA deep hole drill bit, comprehensively adopts the BTA (internal chip removal) mode for deep hole processing, has high processing efficiency, high precision and low processing cost for the circumferential holes, and can be widely applied to products in industries such as nuclear spent fuel storage and transportation containers, chemical pressure containers and the like, and good effect is obtained.
Furthermore, the feedback circular grating and the encoder provided by the invention can measure and feed back the rotation angle of the workpiece and can be matched with the main indexing driving motor so as to further improve the indexing accuracy of the workpiece.
Furthermore, the drill rod lathe bed lifting mechanism is arranged in the invention, so that the height of the drill rod can be adjusted to align the machining positions of the circumferential holes of workpieces with different diameters, and the drill rod lathe bed lifting mechanism can be suitable for a larger-span workpiece diameter range by matching with the adjustment of the spacing between the two first rollers and the spacing between the two second rollers.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
In the drawings:
fig. 1 is a schematic diagram of the whole structure of a special deep hole drilling machine for deep hole coefficient control deep hole processing of a nuclear spent fuel storage and transportation container;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a view in the A-A direction of FIG. 2;
FIG. 4 is a cross-sectional view B-B in FIG. 3;
FIG. 5 is a schematic diagram of a nuclear spent fuel storage and transportation container;
In the figure, 1, a workpiece support, 2, a feedback circular grating, 3, a drill rod lathe bed, 4, a workpiece indexing center frame, 5, a workpiece lathe bed, 6, a workpiece support center frame, 7, an oil feeder, 8, a guide center frame, 9, a drill rod support, 10, a drill rod damping sleeve, 11, a drill rod, 12, a movable drill rod support, 13, a first guide rail, 14, a drill rod box, 15, a drill rod box main motor, 16, a drill rod box feeding motor, 17, a scrap iron conveyor, 18, a cooling liquid circulating water tank, 19, a second guide rail, 20, a driving motor, 21, a workpiece, 41, a workpiece indexing center frame base, 42, a workpiece indexing center frame carrier roller, 43, a main indexing driving motor, 44 a first motor reducer, 45, a first double-head screw, 61, a second motor reducer, 62, a workpiece support center frame carrier roller, 63, a second double-head screw, 421, a first carrier roller support, 422, a rotary shaft, 423, a first roller, an R1, a maximum workpiece processing diameter, R2 and a minimum workpiece processing diameter are shown.
Detailed Description
The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the embodiments, read in conjunction with the accompanying drawings. The following embodiments are described in detail with reference to the drawings.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 1-4, the special deep hole drilling machine for deep hole coefficient control deep hole machining of the nuclear spent fuel storage and transportation container provided by the invention is a special machine tool for manufacturing a circumferential deep hole of the nuclear spent fuel storage and transportation container. The BTA deep hole drill is adopted, and the BTA (internal chip removal) mode deep hole machining is comprehensively utilized, so that the machining efficiency of the circumferential holes is high, the precision is high, and the machining cost is low.
The special deep hole drilling machine for deep hole coefficient control deep hole machining of the nuclear spent fuel storage and transportation container provided by the invention consists of a workpiece lathe bed 5 and a drill rod lathe bed 3, and is in a high-low structure (the workpiece lathe bed 5 and the drill rod lathe bed 3 are respectively positioned at two horizontal planes with different heights), and the workpiece lathe bed 5 is lower than the drill rod lathe bed 3). The workpiece bed 5 is provided with two sets of workpiece center frames (heavy carrier rollers) for supporting the weight of the workpiece 21. One set of workpiece center frame is a workpiece indexing center frame 4, and has the function of controlling the feeding indexing of the roller besides the function of supporting the workpiece. The two sets of workpiece indexing center support rollers 42 of the workpiece indexing center support 4 are designed to be provided with driven first rollers 423 for radial alignment of the workpiece 21, and each first roller 423 is controlled by a rotary shaft driven by the main indexing drive motor 43 and is used for setting pitch circles and realizing C-axis indexing of the workpiece 21. The other set of workpiece center frame is a workpiece supporting center frame 6, and only has the function of supporting workpieces. The workpiece indexing center frame feeding device is arranged on the left end face of the workpiece lathe bed 5, the workpiece indexing center frame 4 can move longitudinally (Z direction), and the distance between the workpiece indexing center frame 4 and the workpiece supporting center frame 6 can be adjusted according to different workpiece lengths so as to optimally receive workpieces with different lengths, ensure that the right end of the workpiece is in a determined position range, and ensure the position accuracy of the whole workpiece and the lathe bed. The right side of the workpiece lathe bed 5 is provided with a drill rod lathe bed 3. The drill rod bed 3 is provided with an oil feeder 7, a guide centre frame 8, a drill rod support 9, a drill rod box 14 and a drill rod box feeding device (comprising a drill rod box feeding motor 16 and a second guide rail 19).
The direction in the present invention is defined as the Z-direction (longitudinal direction) being the axial direction of the spindle of the cutting force of the drill press, i.e. the longitudinal direction of the drill rod 11, and the transverse direction being the direction perpendicular to the Z-direction in the horizontal plane.
Specifically, the special deep hole drilling machine for deep hole coefficient control deep hole machining of the nuclear spent fuel storage and transportation container provided by the invention comprises a drill rod lathe bed 3 and a workpiece lathe bed 5 with high and low structures. The workpiece lathe bed 5 is provided with a workpiece indexing center frame feeding device and a workpiece supporting center frame 6, and the workpiece supporting center frame 6 is close to the drill rod lathe bed 3 and is fixed on the workpiece lathe bed 5 without Z-direction movement. The workpiece indexing center frame feeding device is provided with a workpiece support 1 and a workpiece indexing center frame 4, the workpiece support 1 is positioned on one side of the workpiece indexing center frame 4, which is far away from the drill rod lathe bed 3, the workpiece support center frame 6 is positioned on one side of the workpiece indexing center frame 4, which is close to the drill rod lathe bed 3, the workpiece support 1 and the workpiece indexing center frame 4 can move in the Z direction under the driving of the workpiece indexing center frame feeding device, and the workpiece indexing center frame feeding device comprises a second guide rail 19 which is arranged on the workpiece lathe bed 5 in the Z direction, and a driving motor 20 which drives the workpiece support 1 and the workpiece indexing center frame 4 to move along the second guide rail 19. The workpiece indexing center frame 4 comprises a workpiece indexing center frame base 41, a first motor reducer 44, a first double-head screw 45, The workpiece indexing center frame carrier roller 42 and the two main indexing driving motors 43 are arranged, the workpiece indexing center frame base 41 is positioned on the workpiece lathe bed 5 and the workpiece indexing center frame feeding device, a sliding block matched with the second guide rail 19 is arranged at the bottom of the workpiece indexing center frame base 41 and can move along the second guide rail 19Z under the driving of the driving motor 20, the first double-headed screw 45 is transversely arranged on the workpiece indexing center frame base 41, the two workpiece indexing center frame carrier rollers 42 are symmetrically arranged on the first double-headed screw 45, the first motor reducer 44 drives the first double-headed screw 45 to rotate forward or reversely, the two workpiece indexing center frame carrier rollers 42 synchronously and reversely move, the distance between the two workpiece indexing center frame carrier rollers 42 is adjusted, the workpiece indexing center frame carrier roller 42 comprises a first carrier roller bracket 421, The rotary shaft 422 and the first roller 423 are arranged on the workpiece indexing center frame base 41 and the first double-head screw 45, the bottom of the first roller support 421 is provided with a sliding block, the sliding block can move along the first double-head screw 45 under the drive of the first motor reducer 44, the top of the first roller support 421 is provided with the first roller 423, the rotary shaft 422 is sleeved in the first roller 423 and is connected with the main indexing driving motor 43, the main indexing driving motor 43 drives the rotary shaft 422 to drive the first roller 423 to rotate together, and the workpiece supporting center frame 6 comprises a workpiece supporting center frame base, a second motor reducer 61, the workpiece support center frame carrier roller 62 comprises a second carrier roller bracket and second rollers, the second carrier roller bracket is positioned on the workpiece support center frame base and the second carrier roller 63, the bottom of the second carrier roller bracket is provided with a sliding block, the second carrier roller bracket can move along the second carrier roller 63 under the drive of the second motor reducer 61, and the top of the second carrier roller bracket is provided with the second rollers. The workpiece 21 is placed on the first rollers 423 of the two sets of workpiece indexing center frame carrier rollers 42 and the second rollers of the two sets of workpiece supporting center frame carrier rollers 62, the workpiece support 1 props against one end of the workpiece 21 far away from the drill rod lathe bed 3, Z-direction movement of the workpiece in the drilling process is guaranteed not to occur, a feedback circular grating 2 for measuring the rotation angle of the workpiece is arranged on the workpiece support 1, an encoder for feedback compensation of the rotation angle of the workpiece is arranged at the center of the workpiece 21, and closed-loop control is realized with the main indexing driving motor 43, so that accurate indexing of the workpiece is realized.
The drill rod lathe bed 3 is provided with a drill rod box 14, a drill rod box feeding motor 16 and a first guide rail 13 arranged in the Z direction, a feeding carriage matched with the first guide rail 13 is arranged below the drill rod box 14, the drill rod box feeding motor 16 drives the drill rod box 14 to move along the first guide rail 13 to realize numerical control of drilling depth, one end of the drill rod lathe bed 3, which is close to the workpiece lathe bed 5, is provided with a guide center frame 8 and a drill rod support 9, the drill rod support 9 is positioned on the right side of the guide center frame 8, the first guide rail 13 is positioned on the right side of the drill rod support 9, the first guide rail 13 is provided with a plurality of movable drill rod supports 12, the guide center frame 8 is provided with an oil feeder 7, the drill rod supports 9 and the movable drill rod supports 12 are provided with drill rod damping sleeves 10 to support drill rods, the drill rod box 14 is provided with a drill rod box main motor 15, the tail end of the drill rod 11 is inserted into a main shaft of the drill rod box 14, the drill rod 11 is driven by the drill rod box main motor 15 to rotate, and the front end of the drill rod 11 sequentially passes through the movable drill rod supports 12, the support 9 and the guide center frame 8 and then is aligned with the workpiece 21. The bottom of the drill rod lathe bed 3 is provided with a drill rod lathe bed lifting mechanism for adjusting the height of the drill rod lathe bed. The scrap iron conveyor 17 is arranged on the inner side of the drill rod lathe bed 3, and cooling liquid circulating water is deposited by the cooling liquid circulating water tank 18 and filtered for recycling.
As seen in the plan view of fig. 2, the extension line of the line midpoint of the two first rollers 423 (the center of the first double-ended screw 45) and the line midpoint of the two second rollers (the center of the second double-ended screw 63) coincides with the axis of the drill rod 11. The heights of the two first rollers 423 and the two second rollers are the same, and the two first rollers 423 and the two second rollers always form a rectangular or square shape in a top view, the position of the workpiece indexing center frame 4 changes the length of the rectangular or square shape, the first motor reducer 44 and the second motor reducer 61 always synchronously move, and the width of the rectangular or square shape is changed so as to adapt to workpieces with different diameters, and the positions of different pitch circles of the same workpiece are adjusted. The special deep hole drilling machine for deep hole coefficient control deep hole machining of the nuclear spent fuel storage and transportation container has the maximum workpiece machining diameter R1 of 3000mm and the minimum workpiece machining diameter R2 of 1500mm. The two main indexing driving motors 43 always keep synchronous motion, the main indexing driving motors 43 are used for driving the rotating shafts 422 to rotate, the rotating shafts 422 drive the first idler wheels 423 to rotate, the first idler wheels 423 and the workpiece 21 realize workpiece rotation through rolling friction, encoders are arranged on the centers of the workpieces and used for feedback compensation of rotation angles, closed-loop control is realized with the main indexing driving motors 43, and therefore accurate indexing of the workpieces is achieved.
The working sequence is 1. According to the length of the workpiece, the position of the workpiece indexing center frame 4 is adjusted by using the driving motor 20, the workpiece is placed on the workpiece indexing center frame 4 and the workpiece supporting center frame 6, and according to the diameter of the workpiece, the distance between the two first rollers 423 and the distance between the two second rollers are adjusted by using the first motor reducer 44 and the second motor reducer 61 until the circumferential holes to be processed of the workpiece are aligned with the center of the spindle of the drill rod box. 2. A first hole on the same circumference is drilled. 3. The main indexing driving motor 43 drives the rotating shaft 422 to drive the first roller 423 to rotate, the first roller 423 drives the workpiece to roll, the workpiece drives the second roller to rotate in the rolling process, and the main indexing driving motor 43, the feedback circular grating 2 and the encoder on the workpiece realize precise indexing of the workpiece and sequentially drill other holes on the same circumference. 4. The distance between the two first rollers 423 and the distance between the two second rollers are adjusted by using the first motor reducer 44 and the second motor reducer 61, or the height of the drill rod bed is adjusted by using the drill rod bed lifting mechanism until the center of a hole to be machined on the other circumference of the workpiece is aligned with the center of the drill rod. 5. The first hole in the circumference is drilled. 6. And (3) sequentially drilling other holes on the same circumference after precision indexing.
The invention has the advantages that the workpiece diameter is large, the depth of each hole of the processed hole system is deep, the precision of the processed hole is high, the centering, alignment and precision indexing can be completed by one-time clamping, the requirements of 96 deep hole processing precision on two circumference indexing circles are realized, and the production efficiency is greatly improved. Can be widely applied to products in the industries of nuclear spent fuel storage and transportation containers, chemical pressure containers and the like, and has good effect.
The above is only one form of the structural layout processing process of the special deep hole drilling machine for deep hole coefficient control deep hole processing of the nuclear spent fuel storage and transportation container, and in practical application, according to workpieces with different diameter specifications, the special deep hole drilling machine can be realized by adjusting the workpiece indexing center frame 4 and the workpiece supporting center frame 6, so that the range of workable workpieces can be expanded, the efficiency of a machine tool is improved, and the requirement of full sequence processing precision of drilling deep hole systems can be met by once clamping.
The above is a further detailed description of the present invention with reference to specific embodiments, and it should not be construed that the specific embodiments of the present invention are limited thereto, and that the expansion, the operation method and the data substitution performed on the basis of the technical solution idea of the present invention should fall within the protection scope of the present invention for those skilled in the art to which the present invention pertains.