CN107190133B - A kind of preparation method of drug broken shaft - Google Patents
A kind of preparation method of drug broken shaft Download PDFInfo
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- CN107190133B CN107190133B CN201710402053.XA CN201710402053A CN107190133B CN 107190133 B CN107190133 B CN 107190133B CN 201710402053 A CN201710402053 A CN 201710402053A CN 107190133 B CN107190133 B CN 107190133B
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- broken shaft
- crushing cutter
- broken
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- crushing
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- 239000003814 drug Substances 0.000 title claims abstract description 24
- 229940079593 drug Drugs 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000011265 semifinished product Substances 0.000 claims description 30
- 239000007921 spray Substances 0.000 claims description 23
- 238000005266 casting Methods 0.000 claims description 16
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000047 product Substances 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000000470 constituent Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims description 5
- 230000002045 lasting effect Effects 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000009966 trimming Methods 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 230000000052 comparative effect Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910009043 WC-Co Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229940126589 solid medicine Drugs 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/007—Heat treatment of ferrous alloys containing Co
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
- C21D2221/02—Edge parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to a kind of preparation methods of drug broken shaft, including annealing after smelting, molding, deep cooling, selective hardening, tempering and finishing, pass through the reasonable setting to each step so that broken shaft hardness gets a promotion, and in the case where not increasing cost, the hardness of crushing cutter working face is substantially increased.While the form by rationally limiting crushing cutter so that it is more durable and durable.
Description
Technical field
The invention belongs to medical instruments and alloy Field of Heat-treatment, and in particular to a kind of preparation method of drug broken shaft.
Background technology
In Medicines production process, the processing step that broken right and wrong are usually advised, but not right at present broken
Crusher members make an exhaustive study, by the existing crusher members used find after studying in detail, existing broken portion
Part much also has comparable hardness mostly all using conventional glass hard steel due to having in pharmaceutical raw material,
When being crushed these pharmaceutical raw materials, it is easy to damage crusher members.There are also accurate crusher members to use hard
Alloy（Such as WC-Co classes）, but this series hard alloy price general charged is very high, using such hard alloy as drug
The slightly aobvious waste of crusher members.Therefore it is not very high for how developing a kind of cost, but the good drug of crushing effect is crushed portion
Part, which just becomes, attains problem to be solved.
Invention content
A kind of preparation method of drug broken shaft of proposition of the present invention.
It is realized by following technological means：
A kind of preparation method of drug broken shaft, the drug broken shaft include broken shaft body, spiral crushing knife, top
Bearing and bottom end bearing.
The top bearing and bottom end bearing are located on the both ends of the broken shaft body respectively, and the broken shaft body is
Cylinder, the spiral crushing knife be looped around in a manner of downward spiral in the broken shaft body and with the broken shaft sheet
Body by integral forming.
The spiral crushing knife is crushing cutter surface side close to the face of top bearing side（Groundwork face）, close to bottom end axis
The face held is crushing cutter back side（Underwork face）, the radian of the crushing cutter surface side is less than the radian of the crushing cutter back side；
Crushing cutter middle-end is that the radian of two respective arcs in side changes node, which is divided into crushing cutter section broken
Point of a knife end and crushing cutter butt, the radian at the crushing cutter tip are more than the radian of crushing cutter butt, the crushing cutter butt with
The broken shaft body is connected.
The broken shaft body and spiral crushing knife are molded after smelting using hard alloy steel and are integrally formed.
The heat treatment of following steps is used after mold casting forming.
（1）Annealing, by after mold casting forming broken shaft body and spiral crushing knife semi-finished product be transported in annealing furnace, with
Stove heat keeps the temperature 1 ~ 2 hour, then cools to room temperature with the furnace to 830 ~ 860 DEG C.
（2）Micro- deep cooling：By step（1）Semi-finished product after processing, which are transported in deep cooling box, is cooled to -92 ~ -118 DEG C, holds
Continue insurance 25 ~ 35min of temperature, then goes out deep cooling box and restores to room temperature.
（3）Selective hardening：By step（2）Semi-finished product after processing are transported in vaccum sensitive stove and are heated to 1080 ~
1105 DEG C, 15 ~ 25min is kept the temperature, then sprays water with high pressure to crushing cutter surface side, waits for that entire semi-finished product are cooled to 100 ~ 150 DEG C
After terminate to spray water, be integrally placed in quenching oil and be cooled to room temperature.
（4）Tempering：By step（3）Obtained semi-finished product are returned and are set in vaccum sensitive stove, with stove heat to 500 ~ 520 DEG C,
Heat preservation 1 ~ 2 hour, then comes out of the stove and is air-cooled to room temperature.
（5）Finishing：By step（4）Semi-finished product after processing obtain broken shaft sheet after trimming, polishing, finishing processing
The finished product that body and spiral crushing knife are integrated.
Preferably, the ratio L between crushing cutter butt length and crushing cutter tip length：L1=（1~1.2）：（0.8~
1）.
Preferably, step（3）In spray water with high pressure, the temperature sprayed water is maintained at 25 ~ 35 DEG C.
Preferably, content is calculated as the hard alloy steel by mass percentage：C：0.6 ~ 0.9%, Si：0.3 ~ 0.6%,
Mn：0.8 ~ 1.2%, Cr：5 ~ 6%, Mo：6 ~ 8%, W：2 ~ 5%, Ti：0.3 ~ 0.5%, Nb：0.1 ~ 0.2%, Co：0.1 ~ 0.2%, P<
0.02%, S<0.01%, La：0.05 ~ 0.1%, surplus is Fe and inevitable impurity, and the TiC and NbC in its microstructure
Hardening constituent particle disperse is in matrix.
Preferably, during the molding during broken shaft is provided at both ends with Electric Pulse Treatment device to molding
Broken shaft carry out Electric Pulse Treatment, wherein electrical impulse frequency is 90 ~ 260Hz, and pulsewidth is 20 ~ 120 μ s, and peak current density is
60~220A·mm-2, processing time is to continue 10 ~ 25s after casting is sealed.
Preferably, described spray water with high pressure as periodical water spray, spray water at interval of 0.5 ~ 1.2s, 1 ~ 2min of water spray duration.
Effect of the invention is that：
1, by containing dimension to specific components（The especially wherein addition of Ti alloying elements and content setting）Carry out specific heat
Processing carries out part especially for crushing cutter surface side and is quickly cooled down, during spraying water with high pressure, due to the temperature of crushing cutter surface side
Degree is dramatic decrease, but alloy is the good conductor of heat, and other parts are not sprayed water, so heat is above at this, from
And meeting transfer of heat is at this and again so that the temperature at this increases, to realize the quick reduction-of temperature at this slightly
Rise-continuation quickly reduces-slightly gos up again such durations variation, so as to crystal grain in the microstructure by the face
More refinement, TiC, NbC hard phase disperse are more uniform（If whole water-spraying control, although can also improve hardness, due to
There is no periodic temperature change, to which hard phase disperse will not be made uniform, and degree of grain refinement is also slightly owed
It lacks）.And crushing cutter surface side be with solid medicine raw material principal contact surfaces so that the surface side hardness and wearability obtain by force
Change.Pass through detection, the hardness of surface side（300℃）HRC>62, it is highest to reach 69HRC.
2, it is configured by the shape to crushing cutter, vertical section top radian is more than root, so that when broken
Time will not generate entire knife contact surface larger stress concentration, and since what is be crushed is block stock, it is only necessary to tip foot
It is enough hard, too big acute angle is not needed to, to both protect blade to nor affect on normal work intensity.Pass through opposite side
Radian is set smaller than back side radian so that main working face was more strengthened contacts with block stocks more as possible.Due to
Surface side is by reinforcing, therefore more contact instead can the entire crushing cutter of further protection（Especially back side）.Pass through
The length at crushing cutter tip and butt is defined so that radian variation is happened at as possible by subapical position, is avoided
Tip is too sharp to which the generation of tip breakage problem occur.
3, by the way that the electric pulse of suitable parameters is arranged at both ends when molding so that during casting solidification, compared with
Big dendrite portions are smashed by electric pulse, to form new forming core core so that subsequent heat treatment continues crystal grain thinning and accomplishes fluently
Basis.It is heat-treated by reasonable set, coordinates above-mentioned molding electric pulse technique, crystalline substance has further been refined during deep cooling
Grain so that steel integral strength is improved, and hardness is strengthened, in conjunction with selective hardening so that internal heat is flowed
It is dynamic, the efficiency of heat treatment is enhanced, it is to which Electric Pulse Treatment and heat treatment preferably organically combine, the intensity of steel and hardness is big
Big improves.The hardness of back side has also reached 62 HRC（300℃）Left and right.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of drug broken shaft of the present invention.
Fig. 2 is the broken section structural schematic diagram of crushing cutter in broken shaft of the present invention.
Wherein：1- is crushed shaft body, 11- spiral crushing knives, 111- crushing cutter butts, 112- crushing cutters tip, and 113- is broken
Broken knife middle-end, 114- crushing cutter back sides, 115- crushing cutters surface side, the tops 12- bearing, the bottom ends 13- bearing, L- crushing cutter butts are long
Degree, L1Crushing cutter tip length.
Specific implementation mode
Embodiment 1
As depicted in figs. 1 and 2：
A kind of preparation method of drug broken shaft, the drug broken shaft include broken shaft body, spiral crushing knife, top
Bearing and bottom end bearing.
The top bearing and bottom end bearing are located on the both ends of the broken shaft body respectively, and the broken shaft body is
Cylinder, the spiral crushing knife be looped around in a manner of downward spiral in the broken shaft body and with the broken shaft sheet
Body by integral forming.
The spiral crushing knife is crushing cutter surface side close to the face of top bearing side（Groundwork face）, close to bottom end axis
The face held is crushing cutter back side（Underwork face）, the radian of the crushing cutter surface side is less than the radian of the crushing cutter back side；
Crushing cutter middle-end is that the radian of two respective arcs in side changes node, which is divided into crushing cutter section broken
Point of a knife end and crushing cutter butt, the radian at the crushing cutter tip are more than the radian of crushing cutter butt, the crushing cutter butt with
The broken shaft body is connected.
Ratio L between crushing cutter butt length and crushing cutter tip length：L1=1：0.9.
The broken shaft body and spiral crushing knife are molded after smelting using hard alloy steel and are integrally formed.
Content is calculated as the hard alloy steel by mass percentage：C：0.62%, Si：0.38%, Mn：0.9%, Cr：5.2%,
Mo：6.1%, W：2.5%, Ti：0.32%, Nb：0.12%, Co：0.13%, P：0.01%, S：0.005%, La：0.062%, surplus Fe
With inevitable impurity, and in the microstructure of its finished product the particle disperse of TiC and NbC hardening constituents in matrix.
During the molding broken shaft of the Electric Pulse Treatment device to molding during is provided at both ends in broken shaft
Electric Pulse Treatment is carried out, wherein electrical impulse frequency is 120Hz, and pulsewidth is 30 μ s, peak current density 80Amm-2, when processing
Between for casting sealing after continue 15s.
The heat treatment of following steps is used after mold casting forming.
（1）Annealing, by after mold casting forming broken shaft body and spiral crushing knife semi-finished product be transported in annealing furnace, with
Stove heat keeps the temperature 1.2 hours, then cools to room temperature with the furnace to 838 DEG C.
（2）Micro- deep cooling：By step（1）Semi-finished product after processing, which are transported in deep cooling box, is cooled to -98 DEG C, lasting to keep the temperature
Then 28min goes out deep cooling box and restores to room temperature.
（3）Selective hardening：By step（2）Semi-finished product after processing, which are transported in vaccum sensitive stove, is heated to 1092 DEG C,
18min is kept the temperature, is then sprayed water with high pressure to crushing cutter surface side, terminates water spray after entire semi-finished product are cooled to 115 DEG C, it is whole
It is placed in quenching oil and is cooled to room temperature.
In wherein spraying water with high pressure, the temperature sprayed water is maintained at 28 DEG C.
It is described to spray water with high pressure as periodical water spray, water spray duration 1.5min primary at interval of 1s water sprays.
（4）Tempering：By step（3）Obtained semi-finished product are returned and are set in vaccum sensitive stove, with stove heat to 508 DEG C, heat preservation
It 1.5 hours, then comes out of the stove and is air-cooled to room temperature.
（5）Finishing：By step（4）Semi-finished product after processing obtain broken shaft sheet after trimming, polishing, finishing processing
The finished product that body and spiral crushing knife are integrated.
Comparative example 1
This comparative example cancels electric pulse, and quenching is set as integral quenching, obtains final products and embodiment 1 and carries out pair
Than, after 20 hours impact tests, obtains the abrasion of this comparative example crushing cutter and destroy 1.5 times that size is embodiment 1, damage
Rate is 1.3 times of embodiment 1.
Embodiment 2
As depicted in figs. 1 and 2：
A kind of preparation method of drug broken shaft, the drug broken shaft include broken shaft body, spiral crushing knife, top
Bearing and bottom end bearing.
The top bearing and bottom end bearing are located on the both ends of the broken shaft body respectively, and the broken shaft body is
Cylinder, the spiral crushing knife be looped around in a manner of downward spiral in the broken shaft body and with the broken shaft sheet
Body by integral forming.
The spiral crushing knife is crushing cutter surface side close to the face of top bearing side（Groundwork face）, close to bottom end axis
The face held is crushing cutter back side（Underwork face）, the radian of the crushing cutter surface side is less than the radian of the crushing cutter back side；
Crushing cutter middle-end is that the radian of two respective arcs in side changes node, which is divided into crushing cutter section broken
Point of a knife end and crushing cutter butt, the radian at the crushing cutter tip are more than the radian of crushing cutter butt, the crushing cutter butt with
The broken shaft body is connected.
Ratio L between crushing cutter butt length and crushing cutter tip length：L1=1.1：0.85.
The broken shaft body and spiral crushing knife are molded after smelting using hard alloy steel and are integrally formed.
Content is calculated as the hard alloy steel by mass percentage：C：0.8%, Si：0.52%, Mn：1.1%, Cr：5.8%,
Mo：6.9%, W：3.8%, Ti：0.36%, Nb：0.18%, Co：0.19%, P：0.012%, S：0.001%, La：0.09%, surplus Fe
With inevitable impurity, and in its microstructure the particle disperse of TiC and NbC hardening constituents in matrix.
During the molding broken shaft of the Electric Pulse Treatment device to molding during is provided at both ends in broken shaft
Electric Pulse Treatment is carried out, wherein electrical impulse frequency is 220Hz, and pulsewidth is 100 μ s, peak current density 210Amm-2, processing
Time is lasting 22s after casting sealing.
The heat treatment of following steps is used after mold casting forming.
（1）Annealing, by after mold casting forming broken shaft body and spiral crushing knife semi-finished product be transported in annealing furnace, with
Stove heat keeps the temperature 1.3 hours, then cools to room temperature with the furnace to 852 DEG C.
（2）Micro- deep cooling：By step（1）Semi-finished product after processing, which are transported in deep cooling box, is cooled to -105 DEG C, lasting to protect
Then warm 32min goes out deep cooling box and restores to room temperature.
（3）Selective hardening：By step（2）Semi-finished product after processing, which are transported in vaccum sensitive stove, is heated to 1100 DEG C,
22min is kept the temperature, is then sprayed water with high pressure to crushing cutter surface side, terminates water spray after entire semi-finished product are cooled to 138 DEG C, it is whole
It is placed in quenching oil and is cooled to room temperature.
In wherein spraying water with high pressure, the temperature sprayed water is maintained at 32 DEG C.
It is described to spray water with high pressure as periodical water spray, it sprays water at interval of 0.8s, water spray duration 1.5min.
（4）Tempering：By step（3）Obtained semi-finished product are returned and are set in vaccum sensitive stove, with stove heat to 512 DEG C, heat preservation
It 1.8 hours, then comes out of the stove and is air-cooled to room temperature.
（5）Finishing：By step（4）Semi-finished product after processing obtain broken shaft sheet after trimming, polishing, finishing processing
The finished product that body and spiral crushing knife are integrated.
Comparative example 2
This comparative example other parts and embodiment 2 are identical, the difference is that without adding Ti, and heat in hard alloy steel
There is no subzero treatment in processing（Micro- deep cooling）, obtain after finished product after 20 hours impact tests, obtaining this comparative example crushing cutter
Abrasion size is 1.2 times of embodiment 1, and spoilage is 1.5 times of embodiment 1.
Embodiment 3
As depicted in figs. 1 and 2：
A kind of preparation method of drug broken shaft, the drug broken shaft include broken shaft body, spiral crushing knife, top
Bearing and bottom end bearing.
The top bearing and bottom end bearing are located on the both ends of the broken shaft body respectively, and the broken shaft body is
Cylinder, the spiral crushing knife be looped around in a manner of downward spiral in the broken shaft body and with the broken shaft sheet
Body by integral forming.
The spiral crushing knife is crushing cutter surface side close to the face of top bearing side（Groundwork face）, close to bottom end axis
The face held is crushing cutter back side（Underwork face）, the radian of the crushing cutter surface side is less than the radian of the crushing cutter back side；
Crushing cutter middle-end is that the radian of two respective arcs in side changes node, which is divided into crushing cutter section broken
Point of a knife end and crushing cutter butt, the radian at the crushing cutter tip are more than the radian of crushing cutter butt, the crushing cutter butt with
The broken shaft body is connected.Ratio L between crushing cutter butt length and crushing cutter tip length：L1=1.1：1.
The broken shaft body and spiral crushing knife are molded after smelting using hard alloy steel and are integrally formed.
Content is calculated as the hard alloy steel by mass percentage：C：0.85%, Si：0.56%, Mn：1.0%, Cr：5.5%,
Mo：6.6%, W：3.2%, Ti：0.35%, Nb：0.15%, Co：0.13%, P：0.008%, S：0.005%, La：0.08%, surplus Fe
With inevitable impurity, and in its microstructure the particle disperse of TiC and NbC hardening constituents in matrix.
During the molding broken shaft of the Electric Pulse Treatment device to molding during is provided at both ends in broken shaft
Electric Pulse Treatment is carried out, wherein electrical impulse frequency is 120Hz, and pulsewidth is 90 μ s, peak current density 120Amm-2, processing
Time is to continue 20 after casting is sealed.
The heat treatment of following steps is used after mold casting forming.
（1）Annealing, by after mold casting forming broken shaft body and spiral crushing knife semi-finished product be transported in annealing furnace, with
Stove heat keeps the temperature 1.5 hours, then cools to room temperature with the furnace to 850 DEG C.
（2）Micro- deep cooling：By step（1）Semi-finished product after processing, which are transported in deep cooling box, is cooled to -102 DEG C, lasting to protect
Then warm 20min goes out deep cooling box and restores to room temperature.
（3）Selective hardening：By step（2）Semi-finished product after processing, which are transported in vaccum sensitive stove, is heated to 1092 DEG C,
20min is kept the temperature, is then sprayed water with high pressure to crushing cutter surface side, terminates water spray after entire semi-finished product are cooled to 130 DEG C, it is whole
It is placed in quenching oil and is cooled to room temperature.
In wherein spraying water with high pressure, the temperature sprayed water is maintained at 20 DEG C.
（4）Tempering：By step（3）Obtained semi-finished product are returned and are set in vaccum sensitive stove, with stove heat to 511 DEG C, heat preservation
It 1.5 hours, then comes out of the stove and is air-cooled to room temperature.
（5）Finishing：By step（4）Semi-finished product after processing obtain broken shaft sheet after trimming, polishing, finishing processing
The finished product that body and spiral crushing knife are integrated.
Claims (6)
1. a kind of preparation method of drug broken shaft, which is characterized in that the drug broken shaft is broken including broken shaft body, spiral
Broken knife, top bearing and bottom end bearing；
The top bearing and bottom end bearing are located on the both ends of the broken shaft body respectively, and the broken shaft body is cylinder
Shape, the spiral crushing knife be looped around in a manner of downward spiral in the broken shaft body and with the broken shaft body one
It is body formed；
The spiral crushing knife is crushing cutter surface side close to the face of top bearing side, is broken knife spine close to the face of bottom end bearing
Side, the crushing cutter surface side are main working face, and the crushing cutter back side is underwork face, the radian of the crushing cutter surface side
Less than the radian of the crushing cutter back side；Crushing cutter middle-end is that the radian of two respective arcs in side changes node, this is broken
Crushing cutter section is divided into crushing cutter tip and crushing cutter butt by knife middle-end, and the radian at the crushing cutter tip is more than crushing cutter root
The radian at end, the crushing cutter butt are connected with the broken shaft body；
The broken shaft body and spiral crushing knife are molded after smelting using hard alloy steel and are integrally formed；
The heat treatment of following steps is used after mold casting forming：
（1）Annealing, by after mold casting forming broken shaft body and spiral crushing knife semi-finished product be transported in annealing furnace, with stove plus
Heat keeps the temperature 1 ~ 2 hour, then cools to room temperature with the furnace to 830 ~ 860 DEG C；
（2）Micro- deep cooling：By step（1）Semi-finished product after processing, which are transported in deep cooling box, is cooled to -92 ~ -118 DEG C, lasting to protect
25 ~ 35min of temperature, then goes out deep cooling box and restores to room temperature；
（3）Selective hardening：By step（2）Semi-finished product after processing, which are transported in vaccum sensitive stove, is heated to 1080 ~ 1105 DEG C,
15 ~ 25min is kept the temperature, is then sprayed water with high pressure to crushing cutter surface side, terminates spray after entire semi-finished product are cooled to 100 ~ 150 DEG C
Water is integrally placed in quenching oil and is cooled to room temperature；
（4）Tempering：By step（3）Obtained semi-finished product are returned and are set in vaccum sensitive stove, with stove heat to 500 ~ 520 DEG C, heat preservation 1
It ~ 2 hours, then comes out of the stove and is air-cooled to room temperature；
（5）Finishing：By step（4）Semi-finished product after processing obtained after trimming, polishing, finishing processing broken shaft body and
The finished product that spiral crushing knife is integrated.
2. the preparation method of drug broken shaft according to claim 1, which is characterized in that crushing cutter butt length with it is broken
Ratio L between knife tip length：L1=（1~1.2）：（0.8~1）.
3. the preparation method of drug broken shaft according to claim 1, which is characterized in that step（3）In spray water with high pressure
In, the temperature sprayed water is maintained at 25 ~ 35 DEG C.
4. the preparation method of drug broken shaft according to claim 1, which is characterized in that the hard alloy steel presses quality
Degree is calculated as：C：0.6 ~ 0.9%, Si：0.3 ~ 0.6%, Mn：0.8 ~ 1.2%, Cr：5 ~ 6%, Mo：6 ~ 8%, W：2 ~ 5%, Ti：
0.3 ~ 0.5%, Nb：0.1 ~ 0.2%, Co：0.1 ~ 0.2%, P<0.02%, S<0.01%, La：0.05 ~ 0.1%, surplus is Fe and can not
The impurity avoided, and in its microstructure the particle disperse of TiC and NbC hardening constituents in matrix.
5. the preparation method of drug broken shaft according to claim 1, which is characterized in that broken during the molding
Broken axis is provided at both ends with Electric Pulse Treatment device and carries out Electric Pulse Treatment, wherein electrical impulse frequency to the broken shaft during molding
For 90 ~ 260Hz, pulsewidth is 20 ~ 120 μ s, and peak current density is 60 ~ 220Amm-2, processing time is to continue after casting is sealed
10~25s。
6. the preparation method of drug broken shaft according to claim 1, which is characterized in that described to spray water with high pressure as periodicity
Water spray is sprayed water at interval of 0.5 ~ 1.2s, 1 ~ 2min of water spray duration.
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| CN110938738B (en) * | 2019-11-22 | 2021-11-05 | 天水锻压机床(集团)有限公司 | Heat treatment method of 800T gantry liquid-transferring press head and lifting appliance assembly for heat treatment |
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