CN109788625B - Spiral fan magnetic pole machining and positioning device and method based on superconducting cyclotron - Google Patents
Spiral fan magnetic pole machining and positioning device and method based on superconducting cyclotron Download PDFInfo
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- CN109788625B CN109788625B CN201910193334.8A CN201910193334A CN109788625B CN 109788625 B CN109788625 B CN 109788625B CN 201910193334 A CN201910193334 A CN 201910193334A CN 109788625 B CN109788625 B CN 109788625B
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Abstract
The invention discloses a spiral fan magnetic pole processing and positioning device based on a superconducting cyclotron, which comprises a rotatable rectangular cast iron base, a raised base center circular platform, a rotatable base circular platform, positioning cross slots distributed in the horizontal direction and the vertical direction of the rectangular cast iron base, two raised spiral fan table tops which are distributed between the base center circular platform and the rotatable base circular platform and are bilaterally symmetrical along the length direction of the base, a series of pin holes distributed on the periphery of the spiral fan table tops, and a series of screw holes for fixing distributed on the surfaces of the spiral fan table tops, wherein the diameter length of the rotatable base circular platform is matched with the length of the two raised spiral fan table tops which are bilaterally symmetrical along the length direction of the base. The invention combines and uses the coordinate positioning method, the radial quick positioning method, the peripheral porous positioning method and the tolerance grade positioning method, and solves the difficult problem in the field for a long time when complex curve magnetic pole pad is processed and positioned.
Description
Technical Field
The invention belongs to the technical field of cyclotrons, and particularly relates to a spiral fan magnetic pole machining positioning device and method based on a superconducting cyclotrons.
Background
In a superconducting cyclotron, a large spiral sector magnetic pole is generally used to improve axial focusing. In order to finely correct the magnetic field of the cyclotron, the magnetic pole is frequently required to be disassembled in a reciprocating mode to carry out machining shimming for multiple times, the installation state of the magnetic pole during machining is almost the same as that of the magnetic pole on a magnet, namely the positioning error of each edge of the magnetic pole during machining on a machine tool is within 0.1 mm.
For a straight-sided fan-shaped pole, the pole has four sides: two straight edges and two inside and outside arc-shaped edges are only needed to be positioned, and the straight edges and the arc-shaped edges are better positioned on a machine tool accurately. The 230MeV superconducting proton cyclotron of the Chinese atomic energy science research institute adopts a four-fan spiral magnetic pole structure, 8 magnetic poles are symmetrical up and down, each magnetic pole can be detached from a magnet and transported to a factory for processing, and finally shimming correction of a magnetic field is realized. This magnetic pole side comprises the spiral fan limit of two circular arc limits and both sides, and every limit is processed according to theoretical size and forms, and the machining tolerance is within 0.05mm, and all side positioning accuracy that the benefit processing required the magnetic pole all is within 0.10mm to satisfy the requirement of physical design, compare in the fan-shaped magnetic pole of straight flange, be difficult to find the location benchmark, installation, positioning accuracy are difficult to guarantee.
Disclosure of Invention
The invention provides a machining positioning device and method based on a spiral fan magnetic pole of a superconducting cyclotron, aiming at solving the problems of installation and positioning precision during padding machining of the spiral fan magnetic pole in the cyclotron.
The invention adopts the following method for solving the technical problem:
a spiral fan magnetic pole processing and positioning device based on a superconducting cyclotron is characterized in that: the spiral fan magnetic pole processing and positioning device of the superconducting cyclotron comprises a rectangular cast iron base, a raised base center circular platform which is arranged on the rectangular cast iron base and corresponds to the circular arc of the inner radius of the spiral fan magnetic pole, a rotatable base circular platform which is arranged on the rectangular cast iron base and corresponds to the circular arc of the outer radius of the spiral fan magnetic pole and is provided with a clamping groove, a positioning cross groove which is arranged in the horizontal direction and the vertical direction of the rectangular cast iron base, two raised spiral fan table boards which are arranged between the base center circular platform and the rotatable base circular platform and are bilaterally symmetrical along the length direction of the base, a series of pin holes which are arranged on the periphery of the spiral fan table board, and a series of screw holes which are arranged on the surface of the spiral fan table board and, the diameter length of the rotary base round platform is matched with the length of the two raised spiral fan table-boards which are bilaterally symmetrical along the length direction of the base.
The thickness of the rectangular cast iron base is required to ensure the rigidity of the whole tool, the included angle between the horizontal direction and the vertical direction of the cross groove is 90 degrees, and the planeness is better than 0.10 mm; the size of the side edge of the table top of the spiral fan is consistent with the theoretical size of the magnetic pole.
The periphery of the table top of the spiral fan with the two convex left and right symmetrical blocks is provided with a series of pin holes, and the series of pin holes specifically comprise: the outer side of each spiral edge of the table top of the spiral fan is provided with more than or equal to 2 pin holes, and the outer side edge of the outer radius arc of the table top of the spiral fan is provided with more than or equal to 2 pin holes.
The diameter of each pin hole is more than or equal to 5mm, and the nearest distance between the center of each pin hole and the side edge of the table top is half of the diameter of the pin hole.
The magnetic pole of the spiral fan is divided into an upper fan and a lower fan which are positioned on the table top of the two convex spiral fans which are symmetrical left and right.
A positioning method of a helical fan magnetic pole processing and positioning device based on a superconducting cyclotron comprises the following steps:
step one, the inner edge of the magnetic pole is tightly attached to the circular arc surface of the central circular table edge of the device;
secondly, mounting pins with large diameter tolerance in all pin holes, and adjusting the positions of the magnetic poles to enable the pins to be inserted into all the pin holes;
step three, replacing all the pins one by pins with the diameters meeting the tolerance, and continuously finely adjusting the positions of the magnetic poles until all the pins are replaced;
and step four, after the positioning is finished, fixing the magnetic pole and the positioning device by using a screw through a screw hole on the magnetic pole and a screw hole on the fan-shaped table top of the positioning device.
The diameter tolerance of the pin in the second step is large, namely the negative tolerance range of the diameter of the pin is 0.10 to 0.50 mm; and the diameter of the pin in the third step meets the tolerance, namely the negative tolerance of the diameter of the pin is determined according to the machining tolerance required by the magnet design and is smaller than the diameter tolerance of the pin in the second step.
The base center circular truncated cone and the rotatable base circular truncated cone with the clamping groove are used for quickly positioning the magnetic pole of the helical fan in the radial direction, namely, the inner radius and the outer radius of the magnetic pole of the helical fan are quickly positioned in the radial direction 360 degrees around the center point of the rectangular cast iron base; and a series of pin holes on the periphery of the magnetic pole of the helical fan are used for positioning the coordinates of the magnetic pole of the helical fan, namely the magnetic pole of the helical fan is positioned relative to the positioning cross slot on the rectangular cast iron base.
Advantageous effects of the invention
1. The invention combines and uses the coordinate positioning method, the radial quick positioning method, the peripheral porous positioning method and the tolerance grade positioning method, and solves the difficult problem in the field for a long time when complex curve magnetic pole pad is processed and positioned. The problem of positioning reference which is not easy to solve in the complex curve magnetic pole processing and positioning for a long time is solved by a peripheral porous positioning method; the radial positioning method and the coordinate positioning method are combined for use, so that the defects of singly adopting a peripheral positioning method and singly adopting a radial positioning method are overcome; the problem that the positioning precision and the installation convenience of the magnetic pole are mutually contradictory when the magnetic pole is installed to the shim processing positioning workpiece is solved through a tolerance grade positioning method.
2. According to the invention, the two protruded helical fan table tops which are arranged between the central circular table of the base and the circular table of the rotatable base and are bilaterally symmetrical along the length direction of the base are matched with the diameter length of the circular table of the rotatable base and the length of the two protruded helical fan table tops which are bilaterally symmetrical along the length direction of the base, so that two magnetic poles can be installed at one time, the precision of magnetic pole padding processing is greatly improved, and the padding processing time is reduced.
Drawings
FIG. 1 is a plan view of a positioning device for machining a magnetic pole of a turbofan according to the present invention;
FIG. 2 is a schematic view of the positioning device for mounting the magnetic pole of the turbofan according to the present invention;
in the figure: 1-a cast iron base; 2-1-a base central circular truncated cone; 2-2: a rotatable base circular table; 3-X axis positioning groove; 4-X axis locating slot upper edge; 5-Y axis positioning groove; 6-Y axis locating slot left edge; 7-two raised spiral fan table tops which are symmetrical left and right; 8-a series of pin holes around the table top; 9-fixing screw holes on the positioning device; 10-fixing screw holes on the magnetic pole; 11-magnetic pole a sector has two magnetic poles.
Detailed Description
Principle of the invention
1. The invention 'iteratively positions' the shape characteristics of the object. The conventional alignment object is a "straight-sided fan" pole, which has four sides: two straight edges and two inside and outside arc edges, only need during the location two straight edges and an arc edge to fix a position can, because straight edge and arc edge are better to realize accurate positioning on the lathe. The positioning object of the invention is a 'spiral fan-shaped' magnetic pole, the shape of which is shown in figure 2, and two spiral edges are used for replacing two straight edges.
2. The invention solves the problem that the positioning reference is difficult to find in the complex curve magnetic pole processing and positioning. Firstly, the positioning reference problem of complex curve magnetic pole processing location is solved: by two steps, the first step, a peripheral pin hole positioning method is adopted for the spiral curve with irregular shape, so that no matter how complex the curve is, the problem of complex curve can be solved by only arranging pin holes around the periphery of the curve. And secondly, determining the position of the pin hole in the whole rectangular cast iron base through the cross groove. The pin holes can only determine the shape of the magnetic poles, but cannot determine the position of the shape in the rectangular cast iron base, and the positioning reference problem of the complex curve can be solved through the combination of peripheral pin hole positioning and cross groove positioning. Secondly, the problem of convenience in magnetic pole installation during the processing and positioning of the complex curve magnetic pole is solved: through three steps, the first step, carry out quick location earlier: because the curve is complicated, the number of positioning pin holes around the curve is large, and if the effect of quick positioning cannot be achieved by simply adopting peripheral pin holes for positioning, a radial quick positioning method is adopted. The magnetic poles of the helical fan are clamped by an inner round table (a base center round table) and an outer round table (a rotatable base round table) on the workpiece, and compared with the method that the positioning is carried out by pins one by one, the positioning is more convenient and fast; secondly, performing rough positioning: the problem of complex curve is solved by adopting peripheral pin hole positioning, but the smoothness of the magnetic pole installation process is also limited, if the gap between the pins around the magnetic pole of the spiral fan and the magnetic pole is too small or the negative tolerance range of the pin diameter is smaller, the magnetic pole is difficult to install in place, therefore, the invention adopts a rough positioning method, the diameter of the inserted pin is thinner or the negative tolerance range of the pin diameter is larger, so that the gap between the magnetic pole and the pin is relatively larger, and the magnetic pole is convenient to install in place. Thirdly, performing accurate positioning: the method of the second step is opposite to the method of the accurate positioning, and the negative tolerance range of the diameter of the pin reaches the machining tool difference value required by the magnet design.
Based on the principle of the invention, the invention designs a positioning device for machining the magnetic pole of the spiral fan based on the superconducting cyclotron.
The positioning device for machining the magnetic pole of the helical fan based on the superconducting cyclotron is shown in figure 1, and is characterized in that: the machining and positioning device for the spiral fan magnetic pole of the superconducting cyclotron comprises a rectangular cast iron base 1, a raised base center circular platform 2-1 which is arranged on the rectangular cast iron base and corresponds to an inner radius circular arc of the spiral fan magnetic pole, a rotatable base circular platform 2 with clamping grooves and is arranged on the rectangular cast iron base and corresponds to an outer radius circular arc of the spiral fan magnetic pole, positioning cross slots (3; 5) which are arranged in the horizontal direction and the vertical direction of the rectangular cast iron base, two raised spiral fan table tops 7 which are arranged between the base center circular platform and the rotatable base circular platform and are symmetrical to each other along the length direction of the base, a series of pin holes 8 which are arranged on the periphery of the spiral fan table top, a series of screw holes 9 which are arranged on the surface of the spiral fan table top and are used for fixing, and the diameter length of the rotatable base circular platform 2-2 and the length of the two raised spiral fan table tops 7 which are symmetrical to each And (4) matching.
Supplementary explanation on the superconducting cyclotron:
the superconducting cyclotron comprises a superconducting proton cyclotron which adopts a four-fan spiral fan magnetic pole structure, wherein the upper and the lower parts of the superconducting proton cyclotron are totally 8 magnetic poles, and each magnetic pole is formed by an inner radius circular arc, an outer radius circular arc and two spiral side edges between the inner radius circular arc and the outer radius circular arc.
Supplementary explanation on the workpiece mounting method:
⑴ a positioning cross slot is arranged on the rectangular cast iron base;
⑵ the pin holes around the top of the spiral fan are arranged based on the locating cross slot.
⑶ the positioning device for machining the magnetic pole of the spiral fan is used for machining a superconducting cyclotron by adopting an upper magnetic pole and a lower magnetic pole of one of four magnetic poles, 2 magnetic poles which are symmetrical left and right are machined each time, the thickness of the rectangular cast iron base is required to ensure the rigidity of the whole tool for 4 times, the included angle between the horizontal direction and the vertical direction of the cross groove is 90 degrees, the planeness is better than 0.10mm, and the size of the side edge of the table top of the spiral fan is consistent with the theoretical size of the magnetic pole.
The periphery of the table top of the spiral fan with the two convex left and right symmetrical blocks is provided with a series of pin holes, and the series of pin holes specifically comprise: the outer side of each spiral edge of the table top of the spiral fan is provided with more than or equal to 2 pin holes, and the outer side edge of the outer radius arc of the table top of the spiral fan is provided with more than or equal to 2 pin holes.
The diameter of each pin hole is more than or equal to 5mm, and the nearest distance between the center of each pin hole and the side edge of the table top is half of the diameter of the pin hole.
The magnetic pole of the spiral fan is divided into an upper fan and a lower fan which are positioned on the table top of the two convex spiral fans which are symmetrical left and right.
The positioning method of the positioning device for machining the magnetic pole of the helical fan based on the superconducting cyclotron comprises the following steps:
step one, the inner edge of the magnetic pole is tightly attached to the circular arc surface of the central circular table edge of the device;
secondly, mounting pins with large diameter tolerance in all pin holes, and adjusting the positions of the magnetic poles to enable the pins to be inserted into all the pin holes;
step three, replacing all the pins one by pins with the diameters meeting the tolerance, and continuously finely adjusting the positions of the magnetic poles until all the pins are replaced;
and step four, after the positioning is finished, fixing the magnetic pole and the positioning device by using a screw through a screw hole on the magnetic pole and a screw hole on the fan-shaped table top of the positioning device.
The large diameter tolerance of the pin in the second step means that the negative tolerance range of the diameter of the pin is 0.10 to 0.50 mm; and the diameter of the pin in the third step meets the tolerance, namely the negative tolerance of the diameter of the pin is determined according to the machining tolerance required by the magnet design and is smaller than the diameter tolerance of the pin in the second step.
The base center circular truncated cone and the rotatable base circular truncated cone with the clamping groove are used for quickly positioning the magnetic pole of the helical fan in the radial direction, namely, the inner radius and the outer radius of the magnetic pole of the helical fan are quickly positioned in the radial direction 360 degrees around the center point of the rectangular cast iron base; and a series of pin holes on the periphery of the magnetic pole of the helical fan are used for positioning the coordinates of the magnetic pole of the helical fan, namely the magnetic pole of the helical fan is positioned relative to the positioning cross slot on the rectangular cast iron base.
After the trial, all the pins are successfully inserted into the pin holes 8, which shows that the positioning precision is better than 0.10mm at the moment, and the requirements of physical design are met. After the magnetic pole is positioned on the device, the magnetic pole is placed on a processing machine tool, a processing coordinate system is established by using the upper edge 4 of the X-axis horizontal groove and the left edge 6 of the Y-axis vertical groove for tool setting, and the magnetic pole shimming processing is carried out.
It should be emphasized that the described embodiments of the present invention are illustrative rather than limiting and, thus, the present invention includes embodiments that are not limited to those described in the detailed description.
Claims (8)
1. Spiral fan magnetic pole processing positioner based on superconductive cyclotron, its characterized in that: the spiral fan magnetic pole processing and positioning device of the superconducting cyclotron comprises a rectangular cast iron base, a raised base center circular platform which is arranged on the rectangular cast iron base and corresponds to the circular arc of the inner radius of the spiral fan magnetic pole, a rotatable base circular platform which is arranged on the rectangular cast iron base and corresponds to the circular arc of the outer radius of the spiral fan magnetic pole and is provided with a clamping groove, a positioning cross groove which is arranged in the horizontal direction and the vertical direction of the rectangular cast iron base, two raised spiral fan table boards which are arranged between the base center circular platform and the rotatable base circular platform and are bilaterally symmetrical along the length direction of the base, a series of pin holes which are arranged on the periphery of the spiral fan table board, and a series of screw holes which are arranged on the surface of the spiral fan table board and, the diameter length of the rotary base round platform is matched with the length of the two raised spiral fan table-boards which are bilaterally symmetrical along the length direction of the base.
2. The positioning device for machining magnetic poles of a helical fan based on a superconducting cyclotron as claimed in claim 1, wherein: the thickness of the rectangular cast iron base is required to ensure the rigidity of the whole tool, the included angle between the horizontal direction and the vertical direction of the cross groove is 90 degrees, and the planeness is better than 0.10 mm; the size of the side edge of the table top of the spiral fan is consistent with the theoretical size of the magnetic pole.
3. The positioning device for machining magnetic poles of a helical fan based on a superconducting cyclotron as claimed in claim 1, wherein: the periphery of the table top of the spiral fan with the two convex left and right symmetrical blocks is provided with a series of pin holes, and the series of pin holes specifically comprise: the outer side of each spiral edge of the table top of the spiral fan is provided with more than or equal to 2 pin holes, and the outer side edge of the outer radius arc of the table top of the spiral fan is provided with more than or equal to 2 pin holes.
4. The positioning device for machining magnetic poles of a helical fan based on a superconducting cyclotron as claimed in claim 3, wherein: the diameter of each pin hole is more than or equal to 5mm, and the nearest distance between the center of each pin hole and the side edge of the table top is half of the diameter of the pin hole.
5. The positioning device for machining magnetic poles of a helical fan based on a superconducting cyclotron as claimed in claim 1, wherein: the magnetic pole of the spiral fan is divided into an upper fan and a lower fan which are positioned on the table top of the two convex spiral fans which are symmetrical left and right.
6. The positioning device for machining magnetic poles of a helical fan based on a superconducting cyclotron as claimed in claim 1, wherein: base center round platform and rotatable base round platform that has the draw-in groove be used for radial quick location to the turbofan magnetic pole, the radial quick location of 360 degrees around rectangular cast iron base central point of the interior radius and the outer radius of turbofan magnetic pole promptly specifically is: the magnetic pole of the helical fan is clamped by an inner circular table and an outer circular table on the workpiece; and a series of pin holes on the periphery of the magnetic pole of the helical fan are used for positioning the coordinates of the magnetic pole of the helical fan, namely the magnetic pole of the helical fan is positioned relative to the positioning cross slot on the rectangular cast iron base.
7. A method for positioning a positioning device for a superconducting cyclotron-based machining of a helical fan magnetic pole according to any one of claims 1 to 6, comprising the steps of:
step one, the inner edge of the magnetic pole is tightly attached to the circular arc surface of the central circular table edge of the device;
secondly, mounting pins with large diameter tolerance in all pin holes, and adjusting the positions of the magnetic poles to enable the pins to be inserted into all the pin holes; the large diameter tolerance of the pin means that the negative tolerance range of the diameter of the pin is 0.10 to 0.50 mm;
step three, replacing all the pins one by pins with the diameters meeting the tolerance, and continuously finely adjusting the positions of the magnetic poles until all the pins are replaced;
and step four, after the positioning is finished, fixing the magnetic pole and the positioning device by using a screw through a screw hole on the magnetic pole and a screw hole on the fan-shaped table top of the positioning device.
8. The positioning method of the positioning device for machining magnetic pole of helical fan based on superconducting cyclotron of claim 7 is characterized in that: and the diameter of the pin in the third step meets the tolerance, namely the negative tolerance of the diameter of the pin is determined according to the machining tolerance required by the magnet design and is smaller than the diameter tolerance of the pin in the second step.
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| CN105509824B (en) * | 2016-01-25 | 2018-10-09 | 中国原子能科学研究院 | A kind of magneto flow of liquid metal gauge |
| CN106291415A (en) * | 2016-07-29 | 2017-01-04 | 中国原子能科学研究院 | A kind of magnetic field measuring device positioning superconducting coil position and method thereof |
| CN207888691U (en) * | 2018-02-05 | 2018-09-21 | 北京博创尚和科技有限公司 | Intelligent self-locking clamping and releasing device |
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