CN104550961B - A kind of hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die - Google Patents
A kind of hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die Download PDFInfo
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- CN104550961B CN104550961B CN201410232231.5A CN201410232231A CN104550961B CN 104550961 B CN104550961 B CN 104550961B CN 201410232231 A CN201410232231 A CN 201410232231A CN 104550961 B CN104550961 B CN 104550961B
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Abstract
The invention discloses a kind of hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die, metal powder used includes by mass percentage：34 37wt% iron powder, 20 25wt% nickel powder, 15 19wt% copper powder, 8 10wt% aluminium powder, 8 10wt% zinc powder, 1 2wt% glass putty, 1 2wt% magnesium powder, 2 3wt% silver powder, 1 2wt% phosphorus powder, 2 3wt% zinc 30wt% aluminium intermediate alloy powder.Present invention improves the combination property of wire drawing die cover, is obtained for its compression strength, hardness, bending strength, impact flexibility and wearability and significantly improves, and when mould produces, can effectively reduce the embrittlement of sintering process core rod, improve the utilization rate of core rod；During mold use, abrasion of the hard silk drawing to mould can be reduced, extends the mold use life-span, improves the quality of silk quality product, reduces the production cost of enterprise.
Description
Technical field
The present invention relates to the hot pressed sintering of wire drawing die technical field, more particularly to a kind of polycrystalline diamond wire drawing die to make work
Skill.
Background technology
In metal-pressed machine, metal is set to be forced through mould in the presence of external force, metal cross-sectional area is compressed,
And cross-sectional area, the instrument of shape and size required for obtaining are referred to as wire drawing die, it is that one kind makes wire from coarse to fine, by
Step reaches the instrument of desirable size, is made up of die sleeve and core rod two parts, during use, due to drawing
Effect, can make mould that different degrees of damage occur, and the measured mould of matter reduces enterprise for the production efficiency of raising enterprise
Cost is vital, wants to reduce cost, and prolonged drawing is stablized in acquisition, accurately size, preferable surface quality,
The wire-drawing die for not having high quality is difficult to.
Polycrystalline diamond is plus a small amount of silicon, titanium etc. with the superior in quality synthetic diamond single crystal by conscientiously selecting
Bonding agent, it is polymerized under conditions of HTHP, is got over the features such as its high rigidity, high-wearing feature and excellent cost performance
Favored to get over by wire drawing industry, turn into the widest core material of wire drawing sector application, but diamond fragility is larger, it is difficult
In processing, fragility explosion can occur during mould and mold use is prepared, influence the product quality of enterprise, wire drawing die
Bushing protection core rod can be carried out in core surface.The bushing of wire-drawing mold core is an important step in mould production process, its
In bushing composition and insetting case technology be an important factor for directly affecting wire drawing die final product quality.Currently used diamond is drawn
The silk bushing method of mould has two kinds：One kind is hot edge, and one kind is powder edge, wherein bushing the most prominent with powder.In the prior art
Mould in the utilization rate of core rod, the degree of another people's satisfaction can't be reached in terms of service life and mould repair.
Therefore, the bushing composition with metal dust how is selected, optimizes insetting case technology, improves the utilization rate of core rod, obtain
The mould of good combination property, extend the mold use life-span, improve the efficiency of production, it is urgently to be resolved hurrily at present to reduce production cost
The problem of.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of hot pressing of polycrystalline diamond wire drawing die burning
Manufacture craft is tied, realizes the optimization of the bushing manufacture craft of mould, obtains the mould of good combination property, mould is improved and prepared
The utilization rate of core rod in journey, extend the mold use life-span, increase the reparation number of mould.
The invention discloses a kind of hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die, the wire drawing die includes glomerocryst
Diamond core rod, bushing and with inner chamber steel bushing, bushing parcel core rod is simultaneously located in the inner chamber of steel bushing, bushing by top, bottom
Portion and all portions composition for surrounding core rod, it is bushing to be formed using metal powder sintered；Bushing manufacture craft comprises the following steps：
S1, by mass percentage by 34-37wt% iron powder, 20-25wt% nickel powder, 15-19wt% copper powder, 8-
10wt% aluminium powder, 8-10wt% zinc powder, 1-2wt% glass putty, 1-2wt% magnesium powder, 2-3wt% silver powder, 1-2wt%
Phosphorus powder, 2-3wt% zinc -30wt% aluminium intermediate alloys powder is well mixed obtains metal powder；
S2, steel bushing is placed in graphite jig；
S3, weighing the metal powder prepared in A units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in graphite jig and pushes down metal powder, is put into sintering machine and is cold-pressed with 2.2-3.2MPa pressure by metal powder pressure
It is real to form bushing bottom；
S4, the first end face smearing binding agent in polycrystalline diamond core rod, polycrystalline diamond core rod is placed in steel bushing, made
The first end face that binding agent is smeared on polycrystalline diamond core rod is bonded in bushing bottom；
S5, weigh the metal powder prepared in B units S1 and pour into steel bushing, metal powder is full of the week of polycrystalline diamond core rod
Confining space, vibrations graphite jig make metal powder uniform ground, graphite compression leg are inserted in graphite jig and pushes down metal powder, is put into burning
Metal powder is compacted to form bushing all portions with 1.8-2.7MPa pressure cold pressing in knot machine；
S6, weighing the metal powder prepared in C units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in graphite jig and pushes down metal powder, progress hot pressed sintering in sintering machine is put into and is compacted metal powder to form edge
Set top；During hot pressed sintering, bushing bottom, all portions and top hot pressing is integrally bushing also, bushing, glomerocryst is golden
Hard rock core rod and steel bushing hot pressing are integrally formed polycrystalline diamond wire drawing die；Wherein hot pressed sintering process is as follows：In 2.0-
Under 2.5MPa pressure from room temperature to 590-620 DEG C, pressure is improved to being continuously heating to 630-670 DEG C after 3.5-5.0MPa,
After pressure is risen into the 5.0-5.5MPa heat-insulation pressure keeping 120-300 seconds, it is that 5.0-5.5MPa is cooled to less than 200 DEG C to maintain pressure；
Product is taken out after S7, release and obtains polycrystalline diamond wire drawing die.
Preferably, the metal powder includes by mass percentage：35wt% iron powder, 22wt% nickel powder, 16wt%
Copper powder, 9wt% aluminium powder, 9wt% zinc powder, 1.5wt% glass putty, 1.5wt% magnesium powder, 2.2wt% silver powder, 1wt%
Zinc -30wt% aluminium intermediate alloy the powder of phosphorus powder, 2.8wt%.
Preferably, in S3, cold pressing pressure 2.5-3.0MPa.
Preferably, in S5, cold pressing pressure 2.0-2.5MPa.
Preferably, in S6, heating rate is 20 DEG C/min, and rate of temperature fall is 20 DEG C/min, and maximum sintering temperature is
635-665 DEG C, maximum pressure 5.2-5.4MPa, the heat-insulation pressure keeping time is the 130-290 seconds.
Preferably, in S6, maximum sintering temperature is 650 DEG C, maximum pressure 5.5MPa, and the heat-insulation pressure keeping time is 200
Second.
Preferably, the metal powder granulates degree is 160 mesh or so, and specifically, its granularity can be in 160 ± 10 mesh.
In the present invention, by using the new bushing improvement with metal powder formula and to hot-pressing sintering technique, improve poly-
The combination property of diamond fiber drawing mold sleeve top, the utilization rate of polycrystalline diamond core rod in mould preparation process is improved, extend and draw
In the silk mold use life-span, increase the reparation number of mould.
In the present invention, new bushing metal powder formula is employed, is formulated using iron-nickel-copper system as base and with the addition of it
He forms element.On the one hand, the content of zinc is improved in formula while have adjusted the content of nickel, tin accordingly, is reducing cost
While, intermetallic compound is easily formed, is brought into close contact bushing and the core rod and steel bushing to be formed, during mould use
It is not easy to peel off, increases bushing wearability, extend the mold use life-span, number can be repaired by adding mould；On the other hand,
The granular size of metal powder is reduced, metal dust granularity is 160 mesh or so, has refined crystal grain, has added to form bushing cause
Density, extend the mold use life-span.
In the present invention, bushing technique is optimized, using the technical process of cold moudling-hot pressed sintering, using cold pressing,
The embrittlement of polycrystalline diamond under the high temperature conditions can be prevented while reducing heat input, improves the utilization rate of core rod；The opposing party
Face, using hot pressed sintering, during hot pressed sintering, according to the characteristics of sintered body, employ at different temperature different
Pressure, the time of sintering is shortened, reduce embrittlement of the polycrystalline diamond in sintering process, have selected what can be mutually compensated for
Maximum sintering temperature, heat-insulation pressure keeping time and sintering pressure, maximum sintering temperature are 630-670 DEG C, and the heat-insulation pressure keeping time is
The 120-300 seconds, sintering pressure 5.0-5.5MPa, a crystal grain mature is reached, crystal boundary is obvious, nearly 120 DEG C of the angle of cut, does not have
There is undue subgrain to grow up, shrink uniform, stomata is small, sintered compact and power consumption is few, improves the combination property of mould；
Pressurize cooling is carried out after the completion of sintering, improves the performance of material using waste heat in the case where preventing burning, improves the profit of energy
With rate, the bushing color light of manufacture, the embrittlement for closely, reducing core rod is bonded with polycrystalline diamond core rod and steel bushing, improved
The utilization rate of core rod 80%, cost is saved for the company of wire drawing industry.
Brief description of the drawings
Fig. 1 is the structural representation of polycrystalline diamond wire drawing die in the present invention.
Fig. 2 is the working condition signal of S3 steps in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die in the present invention
Figure.
Fig. 3 is the working condition signal of S4 steps in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die in the present invention
Figure.
Fig. 4 is the working condition signal of S5 steps in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die in the present invention
Figure.
Fig. 5 is the working condition signal of S6 steps in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die in the present invention
Figure.
Embodiment
The present invention is described in detail with instantiation below in conjunction with the accompanying drawings, it should be appreciated that embodiment is served only for illustrating
The present invention, rather than for limiting the invention, any modification made on the basis of the present invention, equivalent substitution etc. exist
In protection scope of the present invention.
Fig. 1 is a kind of structural representation of polycrystalline diamond wire drawing die in the present invention, as shown in figure 1, polycrystalline diamond is drawn
Silk mould includes polycrystalline diamond mold core A, bushing B and the steel bushing C with inner chamber, bushing B parcel polycrystalline diamond mold core As and is simultaneously located at
In steel bushing C inner chamber, bushing B and steel bushing C inner chamber are brought into close contact, and the position based on polycrystalline diamond mold core A and bushing B is closed
System, bushing B is divided for top, bottom and around all portions of core rod, wherein, bushing bottom is located at the bottom of mold core A, bushing all portions
Positioned at the periphery of mold core A, bushing top is located at the top of mold core A；Bushing B, polycrystalline diamond mold core A and steel bushing C are along same
Central axis is symmetrical.
In the embodiment of the present invention, in the bushing manufacturing process of polycrystalline diamond wire drawing die, inlayed using graphite jig
Set compacting.
Fig. 2 is the working condition signal of S3 steps in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die in the present invention
Figure, Fig. 3 are the working state schematic representation of S4 steps in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die in the present invention, are schemed
4 be the working state schematic representation of S5 steps in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die in the present invention, and Fig. 5 is this
In invention in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die S6 steps working state schematic representation.
As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the graphite jig includes upper mould 1, lower mould 2 and pressing mold, wherein, pressing mold bag
Graphite compression leg 3 and graphite pressure cylinder 4 are included, graphite compression leg 3 is cylindrical-shaped structure, and graphite pressure cylinder 4 is the cylinder of the through hole provided with axial direction
Shape structure；
Upper mould 1 is the columnar mould for having inner chamber, and the inner chamber of upper mould 1 is divided into the epicoele and cavity of resorption connected up and down, epicoele
Internal diameter is equal with the external diameter of graphite compression leg and graphite pressure cylinder, and the diameter of cavity of resorption is equal with the external diameter of steel bushing；Lower mould 2 is that have to protrude
The columnar mould of cylinder, the diameter of cylinder is equal with the cavity of resorption diameter of upper mould 1, the round platform of lower mould 2 and the height sum of steel bushing with
The cavity of resorption of upper mould 1 is highly equal；
Positioning compression leg 5 is devised when being positioned to polycrystalline diamond core rod, positioning compression leg 5 can also use graphite system
Into polycrystalline diamond core rod can be enclosed in the through hole of graphite pressure cylinder 4, and it is in the through hole of graphite pressure cylinder and right that positioning compression leg 5 can be inserted into
Polycrystalline diamond core rod carries out fixed and positioned.
Metal dust in each embodiment in the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die disclosed in this invention
Composition proportion (mass percent) is as shown in table 1：
The bushing composition proportion (mass percent) with metal dust in 1 each embodiment of table
Embodiment 1
S1, according to the quality proportioning listed by embodiment 1 in table 1 each metal dust is well mixed；
S2, the lower intracavitary that steel bushing is placed on to upper mould 1, then the cylinder of lower mould 2 is placed in the lower intracavitary of upper mould 1, so, steel
Set is arranged between upper mould 1 and lower mould 2；
S3, weighing the metal powder prepared in A units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in upper mould 1 from epicoele, as shown in Fig. 2 graphite compression leg pushes down metal powder, by upper mould 1, lower mould 2, steel bushing,
The assembly of metal powder and graphite compression leg is put into sintering machine, is compacted metal powder with the cold pressing of 3.0MPa pressure on sintering machine, presses
Real metal powder forms bushing bottom；
S4, polycrystalline diamond core rod is bonded in the through hole of graphite pressure cylinder, smeared in the lower surface of polycrystalline diamond core rod
Binding agent, graphite pressure cylinder is inserted in upper mould 1 from epicoele, then polycrystalline diamond core rod and bushing bottom firm pasting will
In the through hole of positioning compression leg insertion graphite pressure cylinder and polycrystalline diamond core rod is pushed down, graphite pressure cylinder is pulled up by rotation mode, so
Graphite pressure cylinder and positioning compression leg are taken out afterwards, as shown in Figure 3；
S5, weigh the metal powder prepared in B units S1 and pour into steel bushing, and by metal powder full of polycrystalline diamond core rod
Surrounding space, vibrations graphite jig make metal powder uniform ground, and graphite pressure cylinder is inserted in upper mould 1 from epicoele, as shown in figure 4,
Graphite pressure cylinder pushes down the metal powder around polycrystalline diamond core rod in steel bushing, by upper mould 1, lower mould 2, steel bushing, metal powder, glomerocryst gold
The assembly of hard rock core rod and graphite pressure cylinder is put into sintering machine, is cold-pressed on sintering machine with 2.2MPa pressure by metal powder pressure
Real, the metal powder of compacting forms bushing all portions；
S6, weighing the metal powder prepared in C units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in upper mould 1 from epicoele, graphite compression leg pushes down metal powder, as shown in figure 5, by upper mould 1, lower mould 2, steel bushing,
The assembly of polycrystalline diamond core rod, metal powder and graphite compression leg is put into progress hot pressed sintering in sintering machine and is compacted metal powder,
The metal powder of compacting forms bushing top；Specifically, hot pressed sintering process is as follows：Under 2.5MPa pressure from room temperature to
600 DEG C, pressure is improved to being continuously heating to 650 DEG C after 4.5MPa, pressure is risen into 5.2MPa heat-insulation pressure keepings 180 seconds, maintains pressure
Power is that 5.2MPa is cooled to 150 DEG C, wherein, heating rate is 20 DEG C/min, and rate of temperature fall is 20 DEG C/min；
During hot pressed sintering, bushing bottom, all portions and top hot pressing is integrally bushing also, bushing, glomerocryst is golden
Hard rock core rod and steel bushing hot pressing are integrally formed polycrystalline diamond wire drawing die；
Taken out after S7, release and obtain polycrystalline diamond wire drawing die.
Embodiment 2
S1, according to the quality proportioning listed by embodiment 2 in table 1 each metal dust is well mixed；
S2, the lower intracavitary that steel bushing is placed on to upper mould 1, then the cylinder of lower mould 2 is placed in the lower intracavitary of upper mould 1, so, steel
Set is arranged between upper mould 1 and lower mould 2；
S3, weighing the metal powder prepared in A units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in upper mould 1 from epicoele, as shown in Fig. 2 graphite compression leg pushes down metal powder, by upper mould 1, lower mould 2, steel bushing,
The assembly of metal powder and graphite compression leg is put into sintering machine, is compacted metal powder with the cold pressing of 2.5MPa pressure on sintering machine, presses
Real metal powder forms bushing bottom；
S4, polycrystalline diamond core rod is bonded in the through hole of graphite pressure cylinder, smeared in the lower surface of polycrystalline diamond core rod
Binding agent, graphite pressure cylinder is inserted in upper mould 1 from epicoele, then polycrystalline diamond core rod and bushing bottom firm pasting will
In the through hole of positioning compression leg insertion graphite pressure cylinder and polycrystalline diamond core rod is pushed down, graphite pressure cylinder is pulled up by rotation mode, so
Graphite pressure cylinder and positioning compression leg are taken out afterwards, as shown in Figure 3；
S5, weigh the metal powder prepared in B units S1 and pour into steel bushing, and by metal powder full of polycrystalline diamond core rod
Surrounding space, vibrations graphite jig make metal powder uniform ground, and graphite pressure cylinder is inserted in upper mould 1 from epicoele, as shown in figure 4,
Graphite pressure cylinder pushes down the metal powder around polycrystalline diamond core rod in steel bushing, by upper mould 1, lower mould 2, steel bushing, metal powder, glomerocryst gold
The assembly of hard rock core rod and graphite pressure cylinder is put into sintering machine, is cold-pressed on sintering machine with 2.6MPa pressure by metal powder pressure
Real, the metal powder of compacting forms bushing all portions；
S6, weighing the metal powder prepared in C units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in upper mould 1 from epicoele, graphite compression leg pushes down metal powder, as shown in figure 5, by upper mould 1, lower mould 2, steel bushing,
The assembly of polycrystalline diamond core rod, metal powder and graphite compression leg is put into progress hot pressed sintering in sintering machine and is compacted metal powder,
The metal powder of compacting forms bushing top；Specifically, hot pressed sintering process is as follows：Under 2.0MPa pressure from room temperature to
595 DEG C, pressure is improved to being continuously heating to 640 DEG C after 4.0MPa, pressure is risen into 5.4MPa insulations and protected 270 seconds, maintains pressure
180 DEG C are cooled to for 5.4MPa, wherein, heating rate is 20 DEG C/min, and rate of temperature fall is 20 DEG C/min；
During hot pressed sintering, bushing bottom, all portions and top hot pressing is integrally bushing also, bushing, glomerocryst is golden
Hard rock core rod and steel bushing hot pressing are integrally formed polycrystalline diamond wire drawing die；
Taken out after S7, release and obtain polycrystalline diamond wire drawing die.
Embodiment 3
S1, according to the quality proportioning listed by embodiment 3 in table 1 each metal dust is well mixed；
S2, the lower intracavitary that steel bushing is placed on to upper mould 1, then the cylinder of lower mould 2 is placed in the lower intracavitary of upper mould 1, so, steel
Set is arranged between upper mould 1 and lower mould 2；
S3, weighing the metal powder prepared in A units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in upper mould 1 from epicoele, as shown in Fig. 2 graphite compression leg pushes down metal powder, by upper mould 1, lower mould 2, steel bushing,
The assembly of metal powder and graphite compression leg is put into sintering machine, is compacted metal powder with the cold pressing of 2.5MPa pressure on sintering machine, presses
Real metal powder forms bushing bottom；
S4, polycrystalline diamond core rod is bonded in the through hole of graphite pressure cylinder, smeared in the lower surface of polycrystalline diamond core rod
Binding agent, graphite pressure cylinder is inserted in upper mould 1 from epicoele, then polycrystalline diamond core rod and bushing bottom firm pasting will
In the through hole of positioning compression leg insertion graphite pressure cylinder and polycrystalline diamond core rod is pushed down, graphite pressure cylinder is pulled up by rotation mode, so
Graphite pressure cylinder and positioning compression leg are taken out afterwards, as shown in Figure 3；
S5, weigh the metal powder prepared in B units S1 and pour into steel bushing, and by metal powder full of polycrystalline diamond core rod
Surrounding space, vibrations graphite jig make metal powder uniform ground, and graphite pressure cylinder is inserted in upper mould 1 from epicoele, as shown in figure 4,
Graphite pressure cylinder pushes down the metal powder around polycrystalline diamond core rod in steel bushing, by upper mould 1, lower mould 2, steel bushing, metal powder, glomerocryst gold
The assembly of hard rock core rod and graphite pressure cylinder is put into sintering machine, is cold-pressed on sintering machine with 2.0MPa pressure by metal powder pressure
Real, the metal powder of compacting forms bushing all portions；
S6, weighing the metal powder prepared in C units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground,
Graphite compression leg is inserted in upper mould 1 from epicoele, graphite compression leg pushes down metal powder, as shown in figure 5, by upper mould 1, lower mould 2, steel bushing,
The assembly of polycrystalline diamond core rod, metal powder and graphite compression leg is put into progress hot pressed sintering in sintering machine and is compacted metal powder,
The metal powder of compacting forms bushing top；Specifically, hot pressed sintering process is as follows：Under 2.3MPa pressure from room temperature to
600 DEG C, pressure is improved to being continuously heating to 665 DEG C after 4.5MPa, pressure is risen into 5.3MPa insulations and protected 130 seconds, maintains pressure
Less than 200 DEG C are cooled to for 5.3MPa, wherein, heating rate is 20 DEG C/min, and rate of temperature fall is 20 DEG C/min；
During hot pressed sintering, bushing bottom, all portions and top hot pressing is integrally bushing also, bushing, glomerocryst is golden
Hard rock core rod and steel bushing hot pressing are integrally formed polycrystalline diamond wire drawing die；
Taken out after S7, release and obtain polycrystalline diamond wire drawing die.
In embodiment 1-3, during the dress powder of metal powder, the metal powder that B units are loaded in S5 is cold-pressed to be formed again
Bushing all portions, the height in bushing all portions is equal with the height of polycrystalline diamond core rod, and the metal powder of A units is loaded in S3 and S6
Bushing bottom and top, A=C, the height phase of the bushing bottom and top that sinter are formed respectively with the metal powder of C units
Deng.
In embodiment 1-3, from new bushing metal dust formula, the content of Zn-ef ficiency in composition is improved, and
According to the change of Zn-ef ficiency content, the content value of iron, nickel, manganese, tin element is have adjusted, adds aluminium element, magnesium elements and zinc-aluminium
Alloy, the combination property to obtain excellent provide the foundation；Insetting case technology is optimized, it is determined that suitable temperature change
Speed, maximum sintering temperature, heat-insulation pressure keeping time, sintering pressure, improve sintering condition, obtain with low-porosity, height
The mould of intensity and high-compactness.
Claims (7)
1. the hot pressed sintering manufacture craft of a kind of polycrystalline diamond wire drawing die, it is characterised in that the wire drawing die includes glomerocryst gold
Hard rock core rod, bushing and with inner chamber steel bushing, bushing parcel core rod is simultaneously located in the inner chamber of steel bushing, bushing by top, bottom
Formed with around all portions of core rod, it is bushing to be formed using metal sintered；Bushing manufacture craft comprises the following steps：
S1, by mass percentage by 34-37wt% iron powder, 20-25wt% nickel powder, 15-19wt% copper powder, 8-10wt%
Aluminium powder, 8-10wt% zinc powder, 1-2wt% glass putty, 1-2wt% magnesium powder, 2-3wt% silver powder, 1-2wt% phosphorus
Powder, 2-3wt% zinc -30wt% aluminium intermediate alloys powder are well mixed and obtain metal powder；
S2, steel bushing is placed in graphite jig；
S3, weigh the metal powder prepared in A units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground, by stone
Metal powder is pushed down in black compression leg insertion graphite jig, is put into sintering machine and metal powder is compacted by shape with the cold pressing of 2.2-3.2MPa pressure
Into bushing bottom；
S4, the first end face smearing binding agent in polycrystalline diamond core rod, polycrystalline diamond core rod is placed in steel bushing, makes glomerocryst
The first end face that binding agent is smeared on diamond core rod is bonded in bushing bottom；
S5, weigh the metal powder prepared in B units S1 and pour into steel bushing, make metal powder full of empty around polycrystalline diamond core rod
Between, vibrations graphite jig makes metal powder uniform ground, and graphite pressure cylinder is inserted in graphite jig and pushes down metal powder, is put into sintering machine
It is interior to be compacted to form bushing all portions by metal powder with 1.8-2.7MPa pressure cold pressing；
S6, weigh the metal powder prepared in C units S1 and pour into steel bushing, vibrations graphite jig makes metal powder uniform ground, by stone
Metal powder is pushed down in black compression leg insertion graphite jig, progress hot pressed sintering in sintering machine is put into and is compacted metal powder to form bushing top
Portion；During hot pressed sintering, bushing bottom, all portions and top hot pressing is integrally bushing also, bushing, polycrystalline diamond
Core rod and steel bushing hot pressing are integrally formed polycrystalline diamond wire drawing die；Wherein hot pressed sintering process is as follows：Pressed in 2.0-2.5MPa
Under power from room temperature to 590-620 DEG C, pressure is improved to being continuously heating to 630-670 DEG C after 3.5-5.0MPa, by pressure liter
To the 5.0-5.5MPa heat-insulation pressure keeping 120-300 seconds, it is that 5.0-5.5MPa is cooled to less than 200 DEG C to maintain pressure；
Product is taken out after S7, release and obtains polycrystalline diamond wire drawing die.
2. the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die according to claim 1, it is characterised in that the gold
Category powder includes by mass percentage：35wt% iron powder, 22wt% nickel powder, 16wt% copper powder, 9wt% aluminium powder, 9wt%
Zinc powder, 1.5wt% glass putty, 1.5wt% magnesium powder, 2.2wt% silver powder, 1wt% phosphorus powders, 2.8wt% zinc -30wt%
Aluminium intermediate alloy powder.
3. the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die according to claim 1, it is characterised in that in S3
In, cold pressing pressure 2.5-3.0MPa.
4. the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die according to claim 1, it is characterised in that in S5
In, cold pressing pressure 2.0-2.5MPa.
5. the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die according to claim 1, it is characterised in that in S6
In, heating rate is 20 DEG C/min, and rate of temperature fall is 20 DEG C/min, and maximum sintering temperature is 635-665 DEG C, and maximum pressure is
5.2-5.4MPa, heat-insulation pressure keeping time are the 130-290 seconds.
6. the hot pressed sintering manufacture craft of polycrystalline diamond wire drawing die according to claim 1, it is characterised in that in S6
In, maximum sintering temperature is 650 DEG C, maximum pressure 5.5MPa, and the heat-insulation pressure keeping time is 200 seconds.
7. the hot pressed sintering manufacture craft of the polycrystalline diamond wire drawing die according to any one of claim 1-6, its feature
It is, the metal powder granulates degree is 160 mesh.
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| CN113333756B (en) * | 2021-06-09 | 2023-07-04 | 铜陵兢强电子科技股份有限公司 | Enamelled diamond die of high-speed large round wire horizontal enamelling machine |
| CN113421720B (en) * | 2021-06-23 | 2023-03-24 | 铜陵兢强电子科技股份有限公司 | High-speed vertical enamelling machine automatic adjustment center polycrystalline mould |
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