CN102825515B - Machining method of high-accuracy cutter shaft of rotary shear - Google Patents
Machining method of high-accuracy cutter shaft of rotary shear Download PDFInfo
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- CN102825515B CN102825515B CN201210300604.9A CN201210300604A CN102825515B CN 102825515 B CN102825515 B CN 102825515B CN 201210300604 A CN201210300604 A CN 201210300604A CN 102825515 B CN102825515 B CN 102825515B
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Abstract
The invention discloses a machining method of a high-accuracy cutter shaft of a rotary shear. The machining method is sequentially performed according to the following steps of: 1, forging a blank and normalizing; 2, performing rough turning; 3, performing hardening and tempering, i.e., performing quenching and high-temperature tempering treatment on the cutter shift; 4, performing semi-fine turning; 5, performing semi-fine milling; 6, performing fine turning; and 7, performing fine milling, i.e., milling a main outer circle and a taper of the cutter shaft, and meanwhile, arranging a groove in a middle part of an axial end face of a milling grinding wheel, wherein a part which is clamped between the groove and the circumferential surface of the grinding wheel is a milling part of the grinding wheel, so that the milling part of the grinding wheel in a rotation process is used for milling an end face of a cutter shaft shoulder which is kept in the rotation process after being clamped on a machine tool, and the grinding wheel does reciprocating motion in the radial direction of the cutter shaft in a milling process. According to the machining method, a contact area of the grinding wheel and the shaft shoulder can be reduced, jumping of a grinding wheel and aggravation of jumping of the shaft by resonance of an end face of the shaft shoulder and the grinding wheel in a milling process are prevented, and the milling accuracy of the axial end face is guaranteed to be within 0.005 mum.
Description
Technical field
The present invention relates to Machining Technology field, be specifically related to a kind of processing method of circle shear high-accuracy cutter shaft.
Background technology
Circle shear is arranged on finishing line usually, and most of cold-rolling process line all adopts circle shear trimmed or be cut into ribbon steel by moving band steel longitudinal edge, removes steel edge portion and lacks danger.By the rotational shear campaign of upper bottom knife to obtain accurate steel plate width and good edge is shaped.Rotary shear equipment precision is high, steel plate for shearing is thinner, the gap of scissors is about 0.02mm, if cutterhead end face run-out is that 0.01mm. shear history intermediate gap is too large or gap is uneven, insert end faces is beated and just be there will be too greatly that shearing area can't cut, steel plate deformed, steel plate such as to pull at the defect, have a strong impact on the quality of steel plate, therefore very high requirement (required precision see illustrating each significant points of cutter shaft in Fig. 1, Fig. 1) is proposed to the machining accuracy of the cutter shaft of device blade and assembly precision.The main dependence on import of circle shear cutter shaft domestic at present, expensive, govern the development of China's Metallurgical industry.The technological process of tradition processing circle shear cutter shaft is: forging blank (normalizing)-rough turn-modified-half finish turning-half fine grinding-finish turning-fine grinding-inspection.
There is following problem and shortage in above-mentioned technique:
1., due to properties of materials, product, in process, is difficult to the stability ensureing centre bore benchmark.Owing to repeatedly need carry out different technological processes, walking about of benchmark very easily causes product rejection.
2. in Grinding Process, the product end surface processing of beating is unstable, due to the impact by grinder wheel, easily causes beating of emery wheel when side is carried out by grinding, and thus causes the required precision of product 0.005um cannot to be protected (see figure 2).
3. the processing of tapering, main numerical control turning and the grinding machine of relying on ensures.Due to the impact of center hole size and length in process, need the axial force of regular adjustment tailstock thimble.Also need in addition through repeatedly adjusting machine tool guideway to ensure the accuracy of mesh of tapering.Be difficult to form mass production, inefficiency, and easily generation is scrapped.
4. the tapering measuring means of routine, needs more rich experience, larger to the percentage evaluation difficulty of the field of conjugate action.Be unfavorable for producing high-precision product.
So the process technology developing circle shear high-accuracy cutter shaft is imperative.
Summary of the invention
The object of this invention is to provide a kind of axial end method for grinding of the shaft shoulder, the present invention can reduce the contact area of emery wheel and the shaft shoulder, prevent the resonance of Grinding Process axis shoulder end face and emery wheel from emery wheel is beated and aggravate beating of axle, ensureing that axial end grinding accuracy is within 0.005um.
The technical scheme realizing the object of the invention is as follows:
The axial end method for grinding of the shaft shoulder, groove is provided with at the middle part of the axial end of emery wheel, the part be sandwiched between groove to emery wheel side face is the milled portion of emery wheel, the milled portion of the emery wheel in rotation process is made to carry out grinding to the end face being in the shaft shoulder of rotation process axis after clamping is on lathe, in grinding process, emery wheel is moved back and forth along the radial direction of axle.
Axle, before being clamped on lathe, after carrying out grinding or finish turning process, assembling a frock block in the mode of welding or interference, carries out Quenching Treatment to the second centre bore of the axle other end first centre bore of axle one end in this first centre bore.
Groove on emery wheel is annular groove, and the vertical range between the side face of emery wheel and the inner ring surface of groove is more than or equal to the height of 15 times of shaft shoulder.
The distance of described emery wheel upper groove and milled portion axial end is 1-2mm.
Another object of the present invention is to provide a kind of processing method of circle shear high-accuracy cutter shaft, the present invention can reduce the contact area of emery wheel and the shaft shoulder, prevent the resonance of Grinding Process axis shoulder end face and emery wheel from emery wheel is beated and aggravate beating of axle, ensureing that axial end grinding accuracy is within 0.005um.
A processing method for circle shear high-accuracy cutter shaft, carry out according to the following steps successively:
Step 1, forging blank and normalized treatment; Blank is carry out normalized treatment after cutter shaft through forging molding;
Step 2, rough turn: to adopt the cylindrical on engine lathe turning cutter shaft;
Step 3, modified: cutter shaft to be quenched and high tempering process;
Step 4, half finish turning: adopt engine lathe or CNC Lathe Turning cylindrical;
Step 5, half fine grinding: adopt general-purpose grinder grinding cylindrical;
Step 6, finish turning: cutted thread and fine finishining circular cone cylindrical on engine lathe or numerically controlled lathe;
Step 7, fine grinding: the cylindrical of grinding cutter shaft and tapering, groove is set at the middle part of the emery wheel axial end of grinding simultaneously, the part be sandwiched between groove to emery wheel side face is the milled portion of emery wheel, the end face of the milled portion of the emery wheel in rotation process to the cutter shaft shaft shoulder be in rotation process after clamping is on lathe is made to carry out grinding, in grinding process, emery wheel is moved back and forth along the radial direction of cutter shaft.
Carry out the finish turning step of step 6 after step 5 completes before, also comprise the process to cutter shaft centre bore: utilize the smart benchmark after half fine grinding, after grinding or finish turning process are carried out to first centre bore of cutter shaft one end, in this first centre bore, fix a frock block in the mode of welding or interference, Quenching Treatment is carried out to the second centre bore of the cutter shaft other end.
Described frock block comprises the first connector, and one end of this first connector is provided with guide way, and the other end of the first connector is connected with second connector.
Described frock block is the frock block through Quenching Treatment.
Groove on emery wheel is annular groove, and the vertical range between the side face of emery wheel and the inner ring surface of groove is more than or equal to the height of 15 times of shaft shoulder.
The distance of described emery wheel upper groove and milled portion axial end is 1-2mm.
In the lapping process of step 7, by adopting the length bar isometric with cutter shaft, adjust and check the accuracy of mesh of grinding machine precision and cutter shaft tapering.
Have employed such scheme, in grinding process, owing to being provided with the cause of groove, therefore only have milled portion to contact with the axial end of the shaft shoulder, the contact area of emery wheel and the shaft shoulder can be reduced, and emery wheel is moved back and forth along the radial direction of axle, prevent the resonance of Grinding Process axis shoulder end face and emery wheel from emery wheel is beated and aggravate beating of axle, avoid processing unstability, thus grinding method of the present invention can ensure that machining accuracy is within 0.005um.Additionally by the grinding to centre bore, improve roughness and the uniformity of centre bore benchmark.Meanwhile, because centre bore obtains cure process, not easily cause plucking, affect the precision of benchmark.Axle clamping on lathe after, solve the uniformity of axial workpiece benchmark, centre bore adopt quenching and grinding mode, improve baseline stability, ensure that the axiality at axle two ends, the raising of machining accuracy had very great help.
In sum, tool of the present invention has the following advantages:
1, adopt the grinding method of broaching tool formula, ensure that product end surface is beated.
2, by adopting the length bar isometric with product, adjust and check the accuracy of mesh of grinding machine precision and product tapering.The quantification having carried out tapering is produced, and improves production efficiency.Avoid in the process of tapering, the axial force of regular adjustment tailstock thimble.In addition also without the need to repeatedly adjusting machine tool guideway to ensure the accuracy of mesh of tapering.
3, solve the uniformity of axial workpiece benchmark, centre bore adopts the mode of quenching and grinding, and secures frock block, improves baseline stability, ensure that product axiality.
4, constant product quality, can carry out the organization of production quantized.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the required precision of each significant points on cutter shaft;
Fig. 2 is the schematic diagram to shaft shoulder grinding method in prior art;
Fig. 3 is that the present invention adopts emery wheel to the shaft shoulder machining sketch chart of axle;
Fig. 4 is the schematic diagram of the working position of circle shear high-accuracy cutter shaft of the present invention;
Fig. 5 is the structural representation of frock block of the present invention;
Fig. 6 is the A direction view of Fig. 4.
Detailed description of the invention
With reference to Fig. 3, the axial end method for grinding of the shaft shoulder of the present invention, axle 100 is provided with the shaft shoulder 101, groove 201 is provided with at the middle part of the axial end of emery wheel 200, groove on emery wheel is annular groove, and the vertical range H between the side face of emery wheel 200 and the inner ring surface of groove 201 is more than or equal to the height of 15 times of shaft shoulder 101.The distance L of described emery wheel upper groove and milled portion axial end is 1-2mm.The part be sandwiched between groove 201 to emery wheel side face is the milled portion 202 of emery wheel, the milled portion of the emery wheel in rotation process is made to carry out grinding to the end face being in the shaft shoulder of rotation process axis after clamping is on lathe, in grinding process, emery wheel is moved back and forth along the radial direction of axle 100, namely in broaching tool mode to shaft shoulder grinding.In grinding process, owing to being provided with the cause of groove 201, therefore only have milled portion 202 to contact with the axial end of the shaft shoulder, reduce the contact area of emery wheel and the shaft shoulder 101, and emery wheel is moved back and forth along the radial direction of axle 100, prevent the resonance of Grinding Process axis shoulder end face and emery wheel from emery wheel is beated and aggravate beating of axle, avoid processing unstability, thus grinding method of the present invention can ensure that machining accuracy is within 0.005um.
Axle 100 is before being clamped on lathe, after grinding or finish turning process are carried out to first centre bore 15 of axle 100 one end, in this first centre bore 15, assemble a frock block (not shown on figure) in the mode of welding or interference, Quenching Treatment is carried out to the second centre bore of the axle other end.By the grinding to centre bore, improve roughness and the uniformity of centre bore benchmark.Meanwhile, because centre bore obtains cure process, not easily cause plucking, affect the precision of benchmark.Axle clamping on lathe after, solve the uniformity of axial workpiece benchmark, centre bore adopt quenching and grinding mode, improve baseline stability, ensure that the axiality at axle two ends, the raising of machining accuracy had very great help.
With reference to Fig. 4, the processing method of circle shear high-accuracy cutter shaft of the present invention, carry out according to the following steps successively:
Step 1, forging blank and normalized treatment; Blank is carry out normalized treatment after cutter shaft through forging molding, hardness control≤228HB.
Step 2, rough turn: adopt the cylindrical 1-13 on engine lathe turning cutter shaft, surplus control 6mm, circularity reaches 0.2, and roughness reaches Ra6.3um.
Step 3, modified: cutter shaft to be quenched and high tempering process; Control hardness at HRC26-32.
Step 4, half finish turning: adopt engine lathe or CNC Lathe Turning cylindrical 1,3,4,6,7,8,10,11,12,13 and first centre bore 15; Stay 1.2mm grinding allowance.The axiality in control centre hole, requires within 0.02.
Step 5, half fine grinding: adopt general-purpose grinder grinding cylindrical 1,3,4,6,8,11,12,13; Made allowance 0.6mm-0.7mm, benchmark cylindrical 4,8 axiality requires to reach 0.005, and roughness reaches Ra0.8-1.2um.
Step 6, finish turning: cutted thread 7,10 and fine finishining circular cone cylindrical 5,9 on engine lathe or numerically controlled lathe; Screw thread and circular cone be within axiality reaches 0.1mm to foreign round, roughness Ra 1.6um.
Step 7, fine grinding: the main cylindrical of grinding cutter shaft and tapering 1,3,4,6,8,11,12,13, groove is set at the middle part of the emery wheel axial end of grinding simultaneously, the part be sandwiched between groove to emery wheel side face is the milled portion of emery wheel, groove on emery wheel is annular groove, and the vertical range between the side face of emery wheel and the inner ring surface of groove is more than or equal to the height of 15 times of shaft shoulder.The distance of described emery wheel upper groove and milled portion axial end is 1-2mm.Make the end face of the milled portion of the emery wheel in rotation process to the cutter shaft shaft shoulder 14 be in rotation process after clamping is on lathe carry out grinding, in grinding process, emery wheel is moved back and forth along the radial direction of cutter shaft.In the lapping process of step 7, by adopting the length bar isometric with cutter shaft, adjust and check the accuracy of mesh of grinding machine precision and cutter shaft tapering.
Carry out the finish turning step of step 6 after step 5 completes before, also comprise the process to cutter shaft centre bore: utilize the smart benchmark after half fine grinding, after grinding or finish turning process are carried out to first centre bore 15 of cutter shaft one end, in this first centre bore 15, fix a frock block 16 in the mode of welding or interference, Quenching Treatment is carried out to the second centre bore 17 of the cutter shaft other end.Described frock block 16 is the frock block through Quenching Treatment.Described frock block comprises the first connector 16a, one end of this first connector is provided with guide way 16b, guide way 16b is used for being inserted in the first centre bore 15, and the other end of the first connector 16a is connected with a second connector 16c, and the second connector 16c is used for being connected with the top of lathe.The axial end of the first connector 16a is also provided with dowel hole 16d, set screw hole 16e and knockout screw hole 16f, dowel hole 16d to be used for when initial cutter shaft connects, by the location of pin to frock block and cutter shaft, being fixed when set screw hole 16e is used for fastening cutter shaft by screw to frock block and cutter shaft.Knockout screw hole 16f adopts screw both to be separated when being fixedly connected with of disassembling fixture block and cutter shaft, and has the advantage being convenient to make frock block and cutter shaft dismounting.
Claims (6)
1. a processing method for circle shear high-accuracy cutter shaft, is characterized in that, carries out according to the following steps successively:
Step one, forging blank and normalized treatment; Blank is carry out normalized treatment after cutter shaft through forging molding;
Step 2, rough turn: to adopt the first cylindrical (1), the second cylindrical (2), the 3rd cylindrical (3), the 4th cylindrical (4), the 5th cylindrical (5), the 6th cylindrical (6), the 7th cylindrical (7), the 8th cylindrical (8), the 9th cylindrical (9), the tenth cylindrical (10), the 11 cylindrical (11), the 12 cylindrical (12), the 13 cylindrical (13) on engine lathe turning cutter shaft;
Step 3, modified: cutter shaft to be quenched and high tempering process;
Step 4, half finish turning: adopt engine lathe or CNC Lathe Turning first cylindrical (1), the 3rd cylindrical (3), the 4th cylindrical (4), the 6th cylindrical (6), the 7th cylindrical (7), the 8th cylindrical (8), the tenth cylindrical (10), the 11 cylindrical (11), the 12 cylindrical (12), the 13 cylindrical (13) and the first centre bore (15);
Step 5, half fine grinding: adopt general-purpose grinder grinding first cylindrical (1), the 3rd cylindrical (3), the 4th cylindrical (4), the 6th cylindrical (6), the 8th cylindrical (8), the 11 cylindrical (11), the 12 cylindrical (12), the 13 cylindrical (13);
Step 6, finish turning: on engine lathe or numerically controlled lathe, to the 7th cylindrical (7) in step 4, the tenth cylindrical (10) cutted thread, and fine finishining the 5th cylindrical (5), the 9th cylindrical (9) conically;
Step 7, fine grinding: on the basis of step 5, to first cylindrical (1) of cutter shaft, 3rd cylindrical (3), 4th cylindrical (4), 6th cylindrical (6), 8th cylindrical (8), 11 cylindrical (11), 12 cylindrical (12), 13 cylindrical (13) grinding tapering, groove is set at the middle part of the emery wheel axial end of grinding simultaneously, the part be sandwiched between groove to emery wheel side face is the milled portion of emery wheel, the end face of the milled portion of the emery wheel in rotation process to the cutter shaft shaft shoulder be in rotation process after clamping is on lathe is made to carry out grinding, in grinding process, emery wheel is moved back and forth along the radial direction of cutter shaft.
2. the processing method of circle shear high-accuracy cutter shaft according to claim 1, it is characterized in that, carry out the finish turning step of step 6 after step 5 completes before, also comprise the process to cutter shaft centre bore: utilize the smart benchmark after half fine grinding, after grinding or finish turning process are carried out to first centre bore (15) of cutter shaft one end, in this first centre bore (15), fix a frock block in the mode of welding or interference, Quenching Treatment is carried out to the second centre bore of the cutter shaft other end.
3. the processing method of circle shear high-accuracy cutter shaft according to claim 2, is characterized in that, described frock block comprises the first connector, and one end of this first connector is provided with guide way, and the other end of the first connector is connected with second connector.
4. the processing method of circle shear high-accuracy cutter shaft according to claim 1, is characterized in that, the groove on emery wheel is annular groove, and the vertical range between the side face of emery wheel and the inner ring surface of groove is more than or equal to the height of 15 times of shaft shoulder.
5. the processing method of circle shear high-accuracy cutter shaft according to claim 1, is characterized in that, the distance of described emery wheel upper groove and milled portion axial end is 1-2mm.
6. the processing method of circle shear high-accuracy cutter shaft according to claim 1, is characterized in that, in the lapping process of step 7, by adopting the length bar isometric with cutter shaft, adjusts and check the accuracy of mesh of grinding machine precision and cutter shaft tapering.
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| CN201210300604.9A CN102825515B (en) | 2012-08-23 | 2012-08-23 | Machining method of high-accuracy cutter shaft of rotary shear |
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