CN103028919B - Production and machining method for bed knife of lawn mower - Google Patents
Production and machining method for bed knife of lawn mower Download PDFInfo
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- CN103028919B CN103028919B CN201210588504.0A CN201210588504A CN103028919B CN 103028919 B CN103028919 B CN 103028919B CN 201210588504 A CN201210588504 A CN 201210588504A CN 103028919 B CN103028919 B CN 103028919B
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Abstract
The invention discloses a production and machining method for a bed knife of a lawn mower, and belongs to the field of garden machines. The method comprises the following steps of: (1) making a blanking die, a punching die and a press molding die; (2) performing tempering for 2 hours at 445 to 455 DEG C; (3) performing secondary tempering for 2 to 3 hours; (4) performing tertiary tempering for 2 to 3 hours; (5) performing linear cutting machining and machining center machining on the dies, and after the dies are machined, pressing a blank to obtain a rough blank, wherein the blank is made from 65Mn spring steel; (6) reaming a counter bored hole; (7) performing reshaping by using a press; (8) grinding the rough blank by using a grinder; (9) heating the rough blank obtained by the step (8) at 760 to 800 DEG C by using a mesh belt furnace, wherein the transmission speed of a mesh belt is 4 to 6cm/s; (10) performing tempering for 3 hours at 375 to 385 DEG C; and (11) after the rough blank is cooled and reshaped by the press, performing blackening treatment, and grinding a plain end and a standing opening. According to the method, the production efficiency and the quality of a product are greatly improved under the conditions of the conventional product equipment, manpower and material resources, the time of delivery is shortened, and the competitiveness of the product is improved.
Description
Technical field
The invention belongs to graden machine field, more particularly, relate to a kind of production and processing method of lawn machine bed plate.
Background technology
In conventional machining process, lawn machine bed plate adopts plate shearing machine for blanking, and grind two sides with grinding machine, because plate shearing machine is fixed length, and adopt the boring of numerical control round, drilling machine, milling machine milling R groove, so production efficiency is extremely low, cost is high, and milling cutter loss is large, and a class can only process less than 80, extend the production and processing cycle of lawn machine bed plate, add production cost.And the seasonality that lawn machine blade uses is very strong, only has short some months, in the use busy season huge market demand, traditional production and processing method cannot meet the demand in market.
Chinese Patent Application No.: the patent document of 200810063720.7 applyings date: 2008-07-31, disclose a kind of processing method of hob cutter of grass cutter, will through heat treated steel band, carry out circular arc at normal temperatures bending and helically twisted, then severing obtains roll blade, avoid the Rockwell hardness non-uniform phenomenon that drop stamping technique causes, reduce difficulty of processing, ensure that product quality.This invention also discloses a kind of roll blade spiral curved-surface forming device implementing said method, comprise frame, frame is provided with guiding mechanism, straightening mechanism, for carrying out bending mechanism that circular arc bends to steel band and for carrying out helically twisted twist mechanism to the steel band after bending, straightening mechanism is connected with the motor-driven be located in frame with bending mechanism, improve utilization rate of raw materials, save the energy, reduce production space, decrease frock and equipment, handled easily, decrease operating personnel, improve safety coefficient, improve product quality, stabilize part Rockwell hardness, improve production efficiency.But for the bed plate of lawn machine, the method but and inapplicable.First the hardness of lawn machine bed plate is high, and the thickness of bed plate reaches 8mm a bit, cannot process the radian of the edge of a knife and the mounting hole site of cutter with heat treated steel band; Secondly, even if the thickness of some cutter only has 3mm, during with heat treated steel band punching, the mold use life-span is extremely low, and cannot die mould, because the radius of the radian required by us is general all smaller, easily cause circular arc place to rupture, qualification rate is extremely low, causes a large amount of wastes, add cost, make product lose competitiveness.Just because of these problems of existence, market is badly in need of the high and processing method of the lawn machine bed plate that the cutting performance processed is excellent of a kind of working (machining) efficiency.
Summary of the invention
the technical problem solved
For the processing time consuming effort that lawn machine bed plate processing in prior art exists, production cycle length can not meet the problem of the demand of client, the invention provides a kind of production and processing method of lawn machine bed plate, under it can be implemented in existing production equipment and manpower and materials, enhance productivity on a large scale and the quality of product, shorten delivery date simultaneously, add product competitiveness.
technical scheme
Object of the present invention is achieved through the following technical solutions.
The production and processing method of a kind of lawn machine bed plate of the present invention, the steps include:
(1) according to length and the width of blade, determine blanking die size, drive blanking die; Perforating die is driven according to pitch-row; Press-moulding die is opened according to radian; The material selection Cr12MoV of mould; Mould drilling and tapping and after accomplishing fluently wire hole, is incubated 2-3h at 1050 DEG C-1060 DEG C; Concrete temperature retention time is specifically determined according to the thickness of mold materials and size.
(2) tempering 2h at 445 DEG C-455 DEG C;
(3) after the mold cools down in step (2), at 300 DEG C-310 DEG C, second time tempering 2-3h is carried out;
(4) after the mold cools down in step (3), at 200 DEG C-210 DEG C, third time tempering 2-3h is carried out;
(5) carry out linear cutter and Cutter Body Processing with Machining Center with the mould that step (4) processes, Mould Machining is suppressed blade blank after having got well, and obtains crude green body; Wherein, the material selection 65Mn spring steel of blank;
(6) counter sink is expanded;
(7) use press shaping, smooth being convenient to of blade is processed;
(8) thick embryo is ground with grinding machine;
(9) heat treatment: adopt meshbeltfurnace to heat at 760 DEG C-800 DEG C the crude green body of step (8) gained, the transfer rate of guipure is 4-6cm/s;
(10) tempering 3 hours at 375 DEG C-385 DEG C;
(11) after blade cooling, with blackening process after forcing press shaping, then mouth is polished with grinding machine, exit.To stock removal be noted during sharpening mouth, can not have and send out the burnt outward appearance and the quality that affect blade.
Preferably, in described step (1), when opening described blanking die, perforating die, press-moulding die, allowance is 4-5mm.With reasonably ensureing during blanking die blanking that the raw material of slug press have certain allowance, generally will be put into 4-5mm, surplus is too small, and the edge of a knife of blade there will be to be torn, and affect the use of blade, surplus is excessive, increases cost.
Preferably, in described step (5), before compacting blade blank, first blank is heated to 250 DEG C.This is because likely there is the situation of blade breakages during press-moulding die compacting blade, so first warm need be carried out.
Preferably, in described step (8), when grinding thick embryo with grinding machine, allowance is 0.5-0.8mm.Allowance is too small causes after heat treatment that blade mill is less than the requirement of drawing, and allowance is excessive, and when causing fine grinding, distortion is large.
Preferably, in described step (9), be 780 DEG C to the heat treated temperature of crude green body, transfer rate is 5 cm/s.Through overtesting, we select temperature 780 DEG C, crawler-tread speed 5cm/s, and such heat treatment blade blank out more can reach the requirement of our setting, and hardness is up to HRC50-55.
beneficial effect
Compared to prior art, the advantage of technical scheme of the present invention is:
(1) adopt new processing technology of the present invention, use mould blanking, die mould (pressure circular arc R groove and mouth high), punching, drastically increases production efficiency (class can be worked into three or four hundred), reduces cost;
(2) what heat treatment in the past adopted is common electric furnace, artificial heat treatment one by one, bed plate distortion is large, hardness is uneven, efficiency is low, and a class can only be quenched into 100 multi-discs, and what adopt in method of the present invention is full automatic meshbeltfurnace, drastically increase production efficiency, a class can quench seven or eight hundred, and the quality of product is greatly improved simultaneously, other steps of auxiliary method of the present invention, the cutter distortion processed is little, hardness is even, and stay in grade, decreases cost of labor, add output, shorten delivery date;
(3) adopting method of the present invention, is 780 DEG C in the temperature of heat-treating crude green body, and transfer rate is 5 cm/s, and the performance parameters such as heat treatment blade stiffness is out good under such condition.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
embodiment 1
The present embodiment 1 will process the lawn machine bed plate of 1000 types, adopts processing technology of the present invention, the steps include:
(1) according to length and the width of blade, determine that blanking die is of a size of 540mm × 64.5mm, drive blanking die; According to pitch-row 43.28mm, diameter 11mm drives perforating die; Press-moulding die is opened according to radian R22mm; The material selection Cr12MoV of mould; Mould drilling and tapping and after accomplishing fluently wire hole, is incubated 2h during heat treatment at 1050 DEG C;
(2) tempering 2h at 445 DEG C;
(3) after the mold cools down in step (2), at 300 DEG C, second time tempering 2h is carried out;
(4) after the mold cools down in step (3), at 200 DEG C, third time tempering 2h is carried out;
(5) carry out linear cutter and Cutter Body Processing with Machining Center with the mould that step (4) processes, after Mould Machining has been got well, first blade blank is heated to 250 DEG C, then blade blank is suppressed, obtain crude green body; Wherein, the material selection 65Mn spring steel of blank;
(6) counter bore diameter 16-17mm is expanded;
(7) use press shaping, smooth being convenient to of blade is processed;
(8) grind thick embryo with grinding machine according to drawing, flat mouth is ground to 5-5.35mm, and the center that exit is ground to hole is 43.4-43.75mm to the edge of a knife;
(9) heat treatment: adopt the crude green body of meshbeltfurnace to step (8) gained to heat at 760 DEG C, the transfer rate of guipure is 4cm/s;
(10) tempering 3 hours at 375 DEG C;
(11) after blade cooling, with blackening process after forcing press shaping, then polish mouth with grinding machine and make it reach 6 °, be highly 4.5-4.85mm, exit reaches 42.9-43.25mm to center, hole.
The hay mover bed plate Durometer measurements hardness that the present embodiment 2 adopts said method obtained is HRC50-52
embodiment 2
The present embodiment 2 will process the lawn machine bed plate of 522 types, adopts processing technology of the present invention, the steps include:
(1) according to length and the width of blade, determine blanking die size 560mm × 65.5mm, drive blanking die; According to pitch-row 43.28mm, diameter 8.3mm drives perforating die; Press-moulding die is opened according to radian R12.5mm; The material selection Cr12MoV of mould; Mould drilling and tapping and after accomplishing fluently wire hole, is incubated 3h at 1060 DEG C;
(2) tempering 2h at 455 DEG C;
(3) after the mold cools down in step (2), at 310 DEG C, second time tempering 3h is carried out;
(4) after the mold cools down in step (3), at 210 DEG C, third time tempering 3h is carried out;
(5) carry out linear cutter and Cutter Body Processing with Machining Center with the mould that step (4) processes, after mould has installed, first blade blank is heated to 250 DEG C, then blade blank is suppressed, obtain crude green body; Wherein, the material selection 65Mn spring steel of blank;
(6) counter bore diameter 16-17mm is expanded;
(7) use press shaping, smooth being convenient to of blade is processed;
(8) grind thick embryo with grinding machine according to drawing, flat mouth is ground to 4.9-5.25mm, and the center that exit is ground to hole is 46.4-46.75mm to the edge of a knife;
(9) heat treatment: adopt the crude green body of meshbeltfurnace to step (8) gained to heat at 800 DEG C, the transfer rate of guipure is 6cm/s;
(10) tempering 3 hours at 385 DEG C;
(11) after blade cooling, with blackening process after forcing press shaping, then polishing mouth with grinding machine, to make it reach 8 ° of height be 4.4-4.75mm, and exit reaches 45.9-46.25mm to center, hole, and angle is 5 °.
The hay mover bed plate Durometer measurements hardness that the present embodiment 2 adopts said method obtained is HRC53-55.
embodiment 3
The present embodiment 3 will process the lawn machine bed plate of 128 types, adopts processing technology of the present invention, the steps include:
(1) according to length and the width of blade, determine blanking die size 560mm × 66mm, drive blanking die; According to pitch-row 43.28mm, diameter 8.5mm drives perforating die; Press-moulding die is opened according to radian R17.5; The material selection Cr12MoV of mould; Mould drilling and tapping and after accomplishing fluently wire hole, is incubated 2.5h at 1055 DEG C;
(2) tempering 2h at 450 DEG C;
(3) after the mold cools down in step (2), at 305 DEG C, second time tempering 2.5h is carried out;
(4) after the mold cools down in step (3), at 205 DEG C, third time tempering 2.5h is carried out;
(5) carry out linear cutter and Cutter Body Processing with Machining Center with the mould that step (4) processes, after Mould Machining has been got well, first blade blank is heated to 250 DEG C, then blade blank is suppressed, obtain crude green body; Wherein, the material selection 65Mn spring steel of blank;
(6) counter bore diameter 13-14mm is expanded;
(7) use press shaping, smooth being convenient to of blade is processed;
(8) grind thick embryo with grinding machine according to drawing, flat mouth is ground to 9.7-10mm, and the center that exit is ground to hole is 45.25-45.55mm to the edge of a knife;
(9) heat treatment: adopt meshbeltfurnace to heat at 780 DEG C the crude green body of step (8) gained, the transfer rate of guipure is 5cm/s;
(10) tempering 3 hours at 380 DEG C;
(11) after blade cooling, with blackening process after forcing press shaping, then polishing mouth with grinding machine, to make it reach 8 ° of height be 9.2-9.5mm, and exit reaches 44.75-45mm to center, hole, and angle is 6 °.
The hay mover bed plate Durometer measurements hardness that the present embodiment 3 adopts said method obtained is HRC50-53.
Below be schematically described the invention and embodiment thereof, this description does not have restricted, and one of embodiment of the also just the invention shown in embodiment, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from this creation aim, without creatively designing the method step similar to this technical scheme and embodiment, the protection domain of this patent all should be belonged to.
Claims (5)
1. a production and processing method for lawn machine bed plate, the steps include:
(1) according to length and the width of blade, determine blanking die size, drive blanking die; According to blade desired aperture apart from driving perforating die; Press-moulding die is opened according to blade radian; The material selection Cr12MoV of mould; Mould drilling and tapping and after accomplishing fluently wire hole, is incubated 2-3h at 1050 DEG C-1060 DEG C;
(2) tempering 2h at 445 DEG C-455 DEG C;
(3) after the mold cools down in step (2), at 300 DEG C-310 DEG C, second time tempering 2-3h is carried out;
(4) after the mold cools down in step (3), at 200 DEG C-210 DEG C, third time tempering 2-3h is carried out;
(5) carry out linear cutter and Cutter Body Processing with Machining Center with the mould that step (4) processes, Mould Machining is suppressed blade blank after having got well, and obtains crude green body; Wherein, the material selection 65Mn spring steel of blank;
(6) counter sink is expanded to the crude green body that step (5) obtains;
(7) to the crude green body press shaping that step (6) obtains;
(8) crude green body is ground with grinding machine;
(9) heat treatment: adopt meshbeltfurnace to heat at 760 DEG C-800 DEG C the crude green body of step (8) gained, the transfer rate of guipure is 4-6cm/s;
(10) at 375 DEG C-385 DEG C to the crude green body tempering 3 hours of step (8) gained;
(11) after blade cooling, with blackening process after forcing press shaping, then mouth, exit is polished with grinding machine.
2. the production and processing method of a kind of lawn machine bed plate according to claim 1, is characterized in that, in described step (1), when opening described blanking die, perforating die, press-moulding die, allowance is 4-5mm.
3. the production and processing method of a kind of lawn machine bed plate according to claim 1 and 2, is characterized in that, in described step (5), before compacting blade blank, first blank is heated to 250 DEG C.
4. the production and processing method of a kind of lawn machine bed plate according to claim 1 and 2, is characterized in that, in described step (8), during with grinding machine mill crude green body, allowance is 0.5-0.8mm.
5. the production and processing method of a kind of lawn machine bed plate according to claim 4, is characterized in that, in described step (9), be 780 DEG C to the heat treated temperature of crude green body, transfer rate is 5cm/s.
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| CN201210588504.0A CN103028919B (en) | 2012-12-31 | 2012-12-31 | Production and machining method for bed knife of lawn mower |
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| CN103317319B (en) * | 2013-06-09 | 2016-08-10 | 泰尔重工股份有限公司 | Material is the production and processing method that Cr12Mo1V1 digs that limit is cut |
| CN104259757B (en) * | 2014-08-15 | 2016-09-07 | 安庆创跃电器有限公司 | A kind of processing technique of mower blade |
| CN106002130B (en) * | 2016-04-08 | 2018-07-10 | 卢志兵 | A kind of cutter production method |
| CN109623306A (en) * | 2019-01-17 | 2019-04-16 | 安徽屹盛机电科技有限公司 | A kind of lawn rounding machine cutter production technology |
| CN109988977A (en) * | 2019-01-18 | 2019-07-09 | 安徽屹盛机电科技有限公司 | A kind of hedgerow rounding machine cutter production technology |
| WO2021009614A1 (en) * | 2019-07-12 | 2021-01-21 | Magna International Inc. | Machining of steel at elevated surface temperatures |
| CN112276503A (en) * | 2020-10-23 | 2021-01-29 | 安徽三把刀园林机械有限公司 | Production and processing method of bottom cutter of lawn mower |
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