CN108461211B - Polycrystalline painting mold with automatic center calibration function - Google Patents
Polycrystalline painting mold with automatic center calibration function Download PDFInfo
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- CN108461211B CN108461211B CN201711488587.5A CN201711488587A CN108461211B CN 108461211 B CN108461211 B CN 108461211B CN 201711488587 A CN201711488587 A CN 201711488587A CN 108461211 B CN108461211 B CN 108461211B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/065—Insulating conductors with lacquers or enamels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
- H01B13/165—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying by spraying
Abstract
The invention relates to a polycrystalline painting mold with an automatic calibration center. The die comprises a sintered body and a die sleeve, wherein a tube cavity communicated with openings at two sides is arranged in the die sleeve, an annular positioning groove is arranged on a tube body at the lower side of the die sleeve, and a hollow part for accommodating and fixing the sintered body is arranged at the upper side of the tube cavity of the die sleeve; the sintered body comprises a polycrystalline mold core and sintered powder, the sintered powder is embedded and fixed in the hollow part, the polycrystalline mold core is provided with painting holes which penetrate through the polycrystalline mold core up and down and are communicated with the tube cavity, and the sintered powder is provided with through holes matched with the painting holes; the painted holes include a fixed diameter region, and the hole diameters of the painted holes other than the fixed diameter region are different in size in the direction of the central axis thereof. The painting mold can be kept concentric and coaxial with the enameled wire at any time during working, so that the paint film of the enameled wire is ensured to be uniform, the painting mold has the advantages of good coating effect, smooth surface of the paint film and the like, the consistency and the stability of the electrical and mechanical properties of the enameled wire are effectively ensured, and the product quality is improved.
Description
Technical Field
The invention belongs to the technical field of preparation of painting dies, and particularly relates to a polycrystalline painting die with an automatic calibration center.
Background
Since the application of the mold-process painting in the 80's of the 20 th century, the mold-process painting used a natural diamond painting mold, a tungsten steel painting mold and a ruby painting mold. The natural diamond can only process small-sized painting moulds (the mould specification is less than 0.800mm) due to the size limitation, and the large-sized painting moulds (the mould specification is more than or equal to 0.800mm) are made of tungsten steel and ruby. Tungsten steel and ruby become mainstream products of painting dies due to the characteristics of simple processing, good surface roughness, high production efficiency and the like.
The tungsten steel and ruby painting mold has poor wear resistance, the mold inevitably has the phenomena of increased specification, groove generation on the surface of a mold hole, large ellipticity and the like when the mold is used for a long time, paint humps, partial paint, uneven paint layer and unqualified paint film thickness easily occur in the painting process of an electromagnetic wire, and meanwhile, due to the fact that the tungsten steel painting mold has a single mold hole processing means and is not easy to accurately control factors such as aperture, hole type, concentricity and the like, various adverse factors such as partial paint, low voltage resistance, poor adhesion and the like of a finished product wire occur in the production of a high-end electromagnetic wire, the consistency and stability of the electrical and mechanical properties of the electromagnetic wire are hindered, and the product quality of an enterprise is seriously influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide the polycrystalline painting mold for automatically calibrating the center, and the painting mold can be kept concentric and coaxial with the enameled wire at any time during working, so that the paint film of the enameled wire is ensured to be uniform, the coating effect is good, the eccentric phenomenon is not generated, the surface of the paint film is smooth, the consistency and the stability of the electrical and mechanical properties of the enameled wire are effectively ensured, and the product quality is improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a polycrystalline painting mold with an automatic center calibration function comprises a sintered body and a tubular mold sleeve, wherein openings are formed in two ends of the mold sleeve, a tube cavity communicated with the openings in two sides is formed in the mold sleeve, an annular positioning groove is formed in a tube body on the lower side of the mold sleeve, and a hollow part used for containing and fixing the sintered body is formed in an outlet on the upper side of the tube cavity of the mold sleeve; the sintered body comprises an internal polycrystalline mold core and sintered powder for coating the polycrystalline mold core, the sintered powder is embedded and fixed in a hollow part, the polycrystalline mold core is provided with paint coating holes which penetrate through the polycrystalline mold core up and down and are communicated with the tube cavity, and the sintered powder is provided with through holes matched with the paint coating holes; the painting holes comprise sizing areas, and the hole diameters of the painting holes except the sizing areas are different in size along the direction of the central axis of the painting holes.
Preferably, the pipe body of the die sleeve on the upper side of the positioning groove is also provided with a positioning concave ring for assisting positioning; the end surface of one side of the die sleeve outlet is planar.
Preferably, the mold further comprises a painting frame, wherein a plurality of strip-shaped clamping grooves with one open ends are formed in the painting frame, and the central axes of the strip-shaped clamping grooves are parallel to each other; the groove width of the strip-shaped clamping groove is larger than the diameter of the positioning groove, the groove width of the strip-shaped clamping groove is smaller than the diameter of the pipe body of the die sleeve, and the die sleeve is movably arranged in the strip-shaped clamping groove through the positioning groove; the painting frame is also provided with a fixing hole for positioning the painting frame.
Preferably, the lower side of the painting hole is an inlet, and the upper side of the painting hole is an outlet; the hole of scribbling is divided into entry district, lubrication area, compression zone, sizing district and export district in proper order from its import one side to export one side, and the aperture of the junction of adjacent region is the same, just the aperture of the hole of scribbling reduces from entry district to sizing district in proper order, the aperture of export district is greater than the aperture of sizing district.
Preferably, the cross sections of the inlet area, the lubricating area, the compression area and the outlet area along the central axis direction of the painting hole are trapezoidal; the section shape of the sizing area along the central axis direction of the painting hole is rectangular.
Preferably, the height of the inlet zone is greater than that of the lubricating zone, the height of the inlet zone is less than that of the compression zone, and the height of the outlet zone is less than that of the sizing zone.
Preferably, a graphite sleeve is used in the preparation process of the sintered body in the mold, the graphite sleeve is in an integral shape, the graphite sleeve is provided with a plurality of graphite holes penetrating through a body of the graphite sleeve from top to bottom, and central axes of the plurality of graphite holes are parallel to each other;
the preparation process of the sintered body comprises the following steps:
s1, respectively filling graphite backing rods into a plurality of graphite holes of the graphite sleeve, wherein the number of the graphite backing rods is matched with that of the graphite holes, and the graphite backing rods are fixed in the graphite holes;
s2, filling bottom sintering powder into the graphite holes filled with the graphite backing rods;
s3, pressing the polycrystalline mold core into the bottom sintering powder by using a positioning rod, and then pulling out the positioning rod;
s4, filling face sintering powder into the graphite holes, so that the face sintering powder is accumulated on the upper parts of the polycrystalline mold core and the bottom sintering powder, the polycrystalline mold core and the face sintering powder jointly form a to-be-sintered body;
s5, putting a graphite pressing rod into the graphite hole, and pressing the graphite pressing rod on the upper part of the face sintering powder;
s6, placing the whole assembly formed by the graphite sleeve filled with the body to be sintered, the graphite cushion rod and the graphite pressing rod on a graphite sintering machine for sintering;
s7, after sintering, pulling out the graphite press rod, and removing the graphite sleeve from the finished sintered body in the graphite hole to obtain an artificial polycrystalline diamond sintered body, wherein the sintered body comprises an internal polycrystalline mold core and sintered powder for coating the polycrystalline mold core in the sintered body;
and S8, processing the sintered body by sequentially adopting laser and ultrasonic, namely processing a through hole on the sintered powder, and processing a paint coating hole on the polycrystalline mold core, wherein the paint coating hole and the through hole are communicated with each other.
Preferably, every two of the graphite backing rods and the graphite pressing rods are matched with each other to form a clamp for fixing a to-be-sintered body; the graphite pad rod and the graphite hole form interference fit; the outer diameter of the graphite pressing rod is matched with the inner diameter of the graphite hole.
Preferably, the outer diameter of the positioning rod is matched with the inner diameter of the graphite hole, a positioning ring coaxial with the positioning rod is arranged at the top of the positioning rod, a positioning groove for embedding the polycrystalline mold core is formed in the inner side of the positioning ring, and the inner size of the positioning ring is matched with the size of the polycrystalline mold core; the positioning rod enables the polycrystalline mold core to be placed in the middle of the body to be sintered in the horizontal direction.
Preferably, the bottom surface of the graphite backing rod is flush with the bottom surface of the graphite sleeve, and one end of the graphite pressing rod, which is far away from the graphite backing rod, extends out of the graphite sleeve; the graphite pressure bar is characterized in that a positioning protrusion is arranged on the end face of one side, close to the graphite pad bar, of the graphite pressure bar, and the positioning protrusion and the graphite pressure bar are coaxially arranged.
The invention has the beneficial effects that:
1) the invention uses the polycrystal as the raw material of the blank to replace the blank of tungsten steel and the like, has good wear resistance and bright surface, continuously produces the blank for more than 100 hours on a high-speed enamelling machine, has the specification change of less than or equal to 0.001mm, and has no obvious scratching phenomena such as grooves and the like on the inner hole of the die (namely the lacquering hole of the polycrystal die core).
2) The diameter of the painting hole is gradually reduced from the inlet area to the sizing area, and the height of the compression area is larger than that of the inlet area and that of the sizing area.
When the cable passes through the cavity of the die sleeve and the painting hole, the inner wall of the die sleeve and the inner wall of the painting hole are constantly under the pressure of the paint liquid. Because the aperture of the painting hole is gradually reduced from the inlet area to the sizing area, namely the painting hole is in a wedge shape from the inlet area to the sizing area, when the axis of the cable is not coincident with the axis of the painting hole, the axis of the die sleeve tends to coincide with the axis of the cable under the pushing of equal static pressure difference due to the wedge effect, so that the uniform paint liquid is kept in the gap between the cable and the polycrystalline mold core and between the cable and the cavity of the die sleeve, and when the wire passes through the die with the gradually reduced aperture, the required paint film thickness can be achieved. Therefore, the self-calibration painting mold has the advantages of uniform paint film, no paint deviation, smooth surface of the enameled wire, easy control of the thickness of the paint film and the like.
In addition, the height of the inlet zone is greater than that of the lubricating zone, and the height of the inlet zone is less than that of the compression zone, so that the height of the lubricating zone is smaller; the opening angle of the lubrication zone is greater than the opening angle of the compression zone and less than the opening angle of the inlet zone. The lubrication zone mainly serves a transitional function so that the paint liquid can smoothly enter the compression zone from the inlet zone. The main function of the compression area is to compress the paint liquid.
The outlet area is in a flaring shape, and the height of the outlet area is smaller than that of the sizing area. The exit zone is mainly used to protect the sizing zone and to prevent the formation of varnish nodules at the cable exit.
3) When the die sleeve is used, the die sleeve is erected on the painting frame, and the die sleeve is movably arranged on the painting frame, so that when the axis of the cable is not coincident with the axis of the painting hole, the die sleeve moves along the direction limited by the strip-shaped clamping groove of the painting frame under the action of a wedge effect and finally tends to coincide with the axis of the cable, and the die sleeve is matched with the painting frame to jointly ensure that the paint film of the enameled wire is uniform, no eccentricity is generated and the surface is smooth.
4) The painting mold is formed by combining a polycrystalline mold core, sintered powder and a self-calibration mold sleeve, and has the advantages of long service life, good concentricity, excellent surface roughness of a mold hole, consistent hole-shaped structure, high size precision and the like. The polycrystalline mold core has the characteristics of high hardness, good wear resistance, anisotropy and the like, so that the polycrystalline mold core has extremely high wear resistance and good machinability.
During machining, firstly, the polycrystalline mold core is fixed by hot-pressing and sintering metal powder, and a layer of sintering powder with both strength and plasticity is wrapped on the periphery of the polycrystalline mold core, so that the polycrystalline mold core is prevented from cracking in the ultrasonic machining process, and the polycrystalline mold core is conveniently inserted into a hollow part of the self-calibration mold sleeve.
After the polycrystalline mold core and the metal powder are sintered, a pulse laser machine is used for punching, mold holes similar to finished product hole types (namely painting holes) are formed in advance, the precision and standard hole types of +/-0.002 mm can be achieved through ultrasonic processing, and finally a sintered body (containing the polycrystalline mold core) is pressed into an inner hole of a self-calibration mold sleeve through a press machine, so that a large-size self-calibration polycrystalline painting mold finished product is manufactured.
The polycrystalline mold core (i.e., the artificial polycrystalline diamond) has high hardness and good wear resistance, but has large brittleness, small size and poor compressive strength and impact resistance, so the polycrystalline mold core cannot be directly embedded into the mold sleeve for ultrasonic processing.
According to the invention, the sintering powder is arranged on the outer side of the polycrystalline mold core, and then the polycrystalline mold core and the sintering powder are sintered together to form the artificial polycrystalline diamond sintered body, on one hand, the preparation method provides reinforcement for an artificial polycrystalline diamond blank during ultrasonic processing, on the other hand, the prepared sintered body has certain plasticity, and when the artificial polycrystalline diamond is embedded into the mold sleeve, the sintered body can generate plastic deformation to be tightly combined with an inner hole of the mold sleeve to eliminate gaps, so that the artificial polycrystalline diamond is prevented from being extruded to deform and crack and the mold sleeve is prevented from deforming; the third important role is that the plasticity of the sintered body can effectively prevent the insulating paint from overflowing between the sintered body and the die sleeve.
5) When the sintered body is prepared, the graphite sleeve is integrally formed, and the graphite sleeve is provided with a plurality of graphite holes penetrating through the body from top to bottom. Before sintering, putting a to-be-sintered body into each graphite hole, clamping and fixing the to-be-sintered body in the graphite hole by using a clamp, and then placing the whole graphite sleeve on a hot-pressing sintering machine for sintering.
Because the graphite sleeve is in an integral shape, the temperature of each part of the graphite sleeve is uniform in the sintering process, so that the sintering temperature of each sintered body is uniform and even, the hardness and the strength of the sintered bodies in the same batch are ensured, and the quality problem caused by sintering of a single graphite die sleeve in the prior art is avoided.
6) The fixture for the porous graphite sleeve comprises a graphite backing rod at the lower part and a graphite pressing rod at the upper part. The graphite pad rod and the porous graphite sleeve form interference fit, so that no gap exists between the graphite pad rod and the graphite hole; the outer diameter of the graphite pressing rod is matched with the inner diameter of the graphite hole, so that a good compaction effect can be realized. The upper end of the graphite pressing rod extends out of the outer side of the graphite sleeve, when sintering is needed, an upper top plate of the hot-pressing sintering machine is pressed against the upper end of the graphite pressing rod, the upper top plate of the hot-pressing sintering machine is pressed against the lower end face of the porous graphite sleeve, and downward pressure is applied to the graphite pressing rod by the upper top plate of the hot-pressing sintering machine at the moment, so that the to-be-sintered body is always in a compacted state in the sintering process.
7) The invention also comprises a positioning rod, and the top of the positioning rod is provided with a positioning ring which is coaxial with the positioning rod. When the polycrystalline die core pressing device works, the polycrystalline die core is placed in the positioning ring, then the polycrystalline die core is pressed into bottom sintering powder through the positioning rod, and the positioning rod can enable the polycrystalline die core to be placed in the middle of a to-be-sintered body along the horizontal direction due to the fact that the outer diameter of the positioning rod is matched with the inner diameter of the graphite hole.
8) The end part of one end of the graphite pressing rod is provided with the positioning bulge, so that when the graphite pressing rod is inserted into the graphite hole and pressed on the body to be sintered, the upper part of the body to be sintered is pressed out of a pit, and the upper part of the sintered body obtained after sintering is naturally provided with the pit, so that the upper surface and the lower surface of the sintered body can be conveniently distinguished by workers.
9) The number of the single-batch sintering of the original painting mold sintered graphite sleeve is 8, the number of the single-batch sintering of the porous graphite sleeve in the invention can reach 15, and the single-batch sintering number is nearly doubled compared with the previous one.
In addition, the design structure of the porous graphite sleeve greatly reduces the contact area between the graphite sleeve and air, thereby reducing the surface area heat dissipation and improving the heat accumulation capacity and the heat preservation capacity of the graphite sleeve. After the porous graphite sleeve is adopted, the single-batch sintering time is shortened from the original 9 minutes to 6 minutes, wherein the heat preservation time is shortened from the original 4 minutes to 1 minute, namely the whole sintering heat preservation time is shortened by nearly 30 percent.
In conclusion, the invention greatly improves the production efficiency of the painting mold, saves a large amount of electric energy and reduces the manufacturing cost.
In addition, the sintered body produced by the invention has stable and reliable mechanical properties, the hardness deviation HRB value is +/-1, and the density fluctuation is +/-0.1 g/cm3。
Drawings
Fig. 1 is a schematic structural view of a porous graphite sleeve.
3 fig. 3 2 3 is 3 a 3 schematic 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 31 3. 3
FIG. 3 is a schematic view showing the structure of a porous graphite sleeve containing a body to be sintered.
Fig. 4 is a schematic structural view of the sintered body.
Fig. 5a is a schematic structural view of a graphite press bar with positioning protrusions.
Fig. 5b and 5c are schematic structural diagrams of the positioning rod.
Fig. 6 is a schematic structural view of a porous graphite sleeve fitted with a graphite backing rod.
FIG. 7 is a schematic view of the structure of a porous graphite sleeve filled with bottom sintering powder.
Fig. 8 is a schematic view of a polycrystalline core pressed using a locator bar.
Fig. 9 is a schematic view of the polycrystalline core after being pressed into the polycrystalline core.
FIG. 10 is a schematic view of the structure of a porous graphite sleeve containing face sinter powder.
FIG. 11 is a schematic diagram of a structure of a graphite rod pressed into a porous graphite sleeve.
Fig. 12 is a schematic structural view of the porous graphite sleeve after the sintered body is compacted.
Fig. 13 is a diagram showing a sintered state of the porous graphite sleeve.
Fig. 14 is a schematic structural view of the polycrystalline core.
Fig. 15 and 16 are both schematic structural views of the die sleeve.
Fig. 17 is a schematic view of the structure of the painting stand.
Fig. 18 is a schematic view of the construction of the painting mold.
The notations in the figures have the following meanings:
10-graphite sleeve 11-graphite hole 12-temperature measuring point
20-graphite backing rod
30-graphite press rod 31-positioning projection
40-to-be-sintered body 41-bottom sintered powder 42-polycrystalline mold core 43-face sintered powder
44-sintered powder
40 a-sintered body
50-positioning rod 51-positioning ring 52-positioning groove
60 a-upper top plate of hot-pressing sintering machine 60 b-lower top plate of hot-pressing sintering machine
70-electric wire
80-die sleeve 81-positioning groove 82-positioning concave ring 83-tube cavity 84-hollow part
90-painting rack 91-clamping groove 92-fixing hole
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention.
Example 1
Porous graphite sleeve combination device
A porous graphite sleeve combined device for a batch sintering painting mold comprises the following components:
the graphite sleeve 10 is in an integral shape, the graphite sleeve 10 is provided with a plurality of graphite holes 11 penetrating through a body of the graphite sleeve from top to bottom, and central axes of the graphite holes 11 are parallel to each other, as shown in fig. 1 and 2;
the number of the clamps is matched with that of the graphite holes 11, and the clamps are used for clamping and fixing the to-be-sintered body 40 in the graphite holes 11.
As shown in fig. 3, the jig comprises a graphite backing rod 20 and a graphite pressing rod 30 which are respectively arranged at two sides of a body to be sintered 40, and the graphite backing rod 20 and the graphite pressing rod 30 are matched with each other in a group of two; the graphite pad rod 20 is arranged at the lower side of the graphite hole 11, and the graphite pad rod 20 and the graphite hole 11 form interference fit; the graphite pressing rod 30 is inserted into the graphite hole 11 from top to bottom, and the outer diameter of the graphite pressing rod 30 is matched with the inner diameter of the graphite hole 11.
The meaning that the graphite pad rods 20 and the graphite pressure rods 30 are matched with each other in a group of two graphite pad rods 20 and graphite pressure rods 30 is that each graphite pad rod 20 is matched with one graphite pressure rod 30 for use, and the graphite pad rods 20 and the graphite pressure rods 30 which are matched with each other are used in the same graphite hole 11.
In order to ensure the compressive strength of each graphite hole when being pressed, the minimum distance between the hole walls of the adjacent graphite holes 11 is more than 3.5 mm.
As shown in fig. 3, the bottom surface of the graphite backing rod 20 is flush with the bottom surface of the graphite sleeve 10, and the end of the graphite pressing rod 30 far away from the graphite backing rod 20 extends outside the graphite sleeve 10.
As shown in fig. 5a, a positioning protrusion 31 is provided on one end surface of the graphite pressure bar 30 close to the graphite backing bar 20, and the positioning protrusion 31 is coaxially provided with the graphite pressure bar 30. The positioning projections 31 serve to form recesses in the sintered body, thereby facilitating the distinction between the upper and lower surfaces of the sintered body.
As shown in fig. 5b and 5c, the combined device further includes a positioning rod 50 for horizontally placing the polycrystalline mold core 42 in the body 40 to be sintered in the middle of the body 40 to be sintered, an outer diameter of the positioning rod 50 matches with an inner diameter of the graphite hole 11, a positioning ring 51 coaxial with the positioning rod 50 is disposed at the top of the positioning rod 50, a positioning groove 52 is formed inside the positioning ring 51, and an inner size of the positioning ring 51 matches with a size of the polycrystalline mold core 42.
The positioning rod 50 has various structures, and in order to ensure that the upper end surface of the compacted polycrystalline mold core 42 is flush with the upper end surface of the bottom sintered powder 41 (as shown in fig. 9), the positioning rod 50 may have a structure as shown in fig. 5c, i.e., the bottom end surface of the positioning groove 52 is flush with the upper end surface of the positioning rod 50.
And a temperature measuring point 12 is arranged on the outer side of the graphite sleeve 10.
Example 2
Process for producing artificial diamond sintered body
The preparation process uses the porous graphite sleeve combination device of the batch sintering painting mold as described in the embodiment 1, namely, the graphite sleeve 10 is in an integral shape, the graphite sleeve 10 is provided with a plurality of graphite holes 11 penetrating through the graphite sleeve 10 from top to bottom, and the central axes of the plurality of graphite holes 11 are parallel to each other;
the preparation process comprises the following steps:
s1, as shown in figure 6, respectively installing graphite backing rods 20 into a plurality of graphite holes 11 of a graphite sleeve 10, wherein the number of the graphite backing rods 20 is matched with that of the graphite holes 11, and the graphite backing rods 20 are fixed in the graphite holes 11;
s2, as shown in figure 7, filling bottom sintering powder 41 into the graphite holes 11 filled with the graphite backing rods 20;
s3, as shown in FIG. 8, pressing the polycrystalline mold core 42 into the bottom sintering powder 41 by using a positioning rod 50, and then pulling out the positioning rod 50; as shown in fig. 9, the upper end surface of the pressed polycrystalline core 42 is flush with the upper end surface of the bottom sintered powder 41;
s4, as shown in FIG. 10, face sintering powder 43 is filled into the graphite hole 11, so that the face sintering powder 43 is accumulated on the upper portions of the polycrystalline mold core 42 and the bottom sintering powder 41, the polycrystalline mold core 42 and the face sintering powder 43 jointly form a to-be-sintered body 40;
s5, as shown in FIG. 11, putting a graphite pressing rod 20 into the graphite hole 11, and pressing the graphite pressing rod 20 on the upper part of the face sintering powder 43;
s6, as shown in figures 12 and 13, placing the whole assembly formed by the graphite sleeve 10 filled with the body to be sintered 40, the graphite backing rod 20 and the graphite pressing rod 30 on a graphite sintering machine for sintering;
and S7, after sintering, pulling out the graphite press rod 20, and removing the finished sintered body in the graphite hole 11 from the graphite sleeve 10 to obtain an artificial polycrystalline diamond sintered body 40a, wherein the sintered body 40a comprises a polycrystalline mold core 42 and sintered powder 44, and the polycrystalline mold core 42 is coated in the sintered powder 44, as shown in figure 4.
And S8, as shown in FIG. 14, processing the sintered body 40a by sequentially adopting laser and ultrasonic waves, namely processing through holes on the sintered powder 44, and processing painting holes 421 on the polycrystalline mold core 42, wherein the painting holes 421 and the through holes are communicated with each other.
The graphite backing rods 20 and the graphite pressing rods 30 are matched with each other in pairs to form a clamp for fixing a to-be-sintered body 40; the graphite pad rod 20 and the graphite hole 11 form interference fit; the outer diameter of the graphite press rod 30 is matched with the inner diameter of the graphite hole 11.
As shown in fig. 13, a temperature measuring point 12 is arranged on the outer side of the graphite sleeve 10.
The outer diameter of the positioning rod 50 is matched with the inner diameter of the graphite hole 11, a positioning ring 51 coaxial with the positioning rod 50 is arranged at the top of the positioning rod 50, a positioning groove 52 for embedding the polycrystalline mold core 42 is formed in the inner side of the positioning ring 51, and the inner size of the positioning ring 51 is matched with the size of the polycrystalline mold core 42; the positioning rod 50 enables the polycrystalline mold core 42 to be placed in the middle of the body to be sintered 40 in the horizontal direction.
The minimum spacing between the walls of adjacent graphite holes 11 is > 3.5 mm.
As shown in fig. 6 to 13, the bottom surface of the graphite backing rod 20 is flush with the bottom surface of the graphite sleeve 10, and one end of the graphite pressing rod 30, which is far away from the graphite backing rod 20, extends outside the graphite sleeve 10.
The graphite pressure bar 30 is provided with a positioning protrusion 31 on the end surface of one side close to the graphite backing bar 20, and the positioning protrusion 31 and the graphite pressure bar 30 are coaxially arranged.
The physical properties of the artificial polycrystalline diamond sintered body prepared by the invention are as follows: the reduction of area is 15-20%, Rockwell hardness HRB 60-70.
The artificial polycrystalline diamond sintered body can provide protection for small-size artificial polycrystalline diamond in the ultrasonic processing process without cracking, the processing efficiency of the small-size artificial polycrystalline diamond is improved, meanwhile, the sintered body has good plasticity, provides a jacket protection effect for the small-size artificial polycrystalline diamond, and is inlaid in a stainless steel jacket to prepare the painting mold.
Example 3
Polycrystalline painting mold with automatic center calibration function
The mold includes a sintered body 40a and a die case 80 having a tubular shape and provided with openings at both ends.
As shown in fig. 15, 16 and 18, a tube cavity 83 communicating openings at two sides is arranged in the die sleeve 80, a ring-shaped positioning groove 81 is arranged on the lower tube body of the die sleeve 80, and a hollow part 84 for accommodating the fixed sintered body 40a is arranged at the upper outlet of the tube cavity 83 of the die sleeve 80; the sintered body 40a comprises a polycrystalline mold core 42 positioned inside and sintered powder 44 for coating the polycrystalline mold core 42 in the sintered body, the sintered powder 44 is embedded and fixed in the hollow part 84, a painting hole 421 penetrating through the polycrystalline mold core 42 up and down and communicated with the tube cavity 83 is formed in the polycrystalline mold core 42, and a through hole matched with the painting hole 421 is formed in the sintered powder 44; the painting holes 421 include a calibration area 4214, and the size of the hole diameter of the painting holes 421 other than the calibration area 4214 in the direction of the central axis thereof is different.
As shown in fig. 16 and 18, the die sleeve 80 is further provided with a positioning concave ring 82 for auxiliary positioning on the pipe body above the positioning groove 81; the end surface of one side of the outlet of the die sleeve 80 is planar. The positioning concave ring 82 plays a role in fixing and positioning, and ensures that the painting mold can be quickly positioned when being put on a machine.
As shown in fig. 17 and 18, the mold further includes a painting frame 90, a plurality of strip-shaped slots 91 with an open end are disposed on the painting frame 90, and central axes of the strip-shaped slots 91 are parallel to each other; the groove width of the strip-shaped clamping groove 91 is larger than the diameter of the positioning groove 81, the groove width of the strip-shaped clamping groove 91 is smaller than the diameter of the pipe body of the die sleeve 80, and the die sleeve 80 is movably arranged in the strip-shaped clamping groove 91 through the positioning groove 81; the painting stand 90 is also provided with fixing holes 92 for its own positioning.
As shown in fig. 18, the die sleeve 80 is clamped in the strip-shaped clamping groove 91 through the positioning groove 81, and when the cable runs through the lumen of the die sleeve 80, the positioning groove 81 of the die sleeve 80 cooperates with the clamping groove 91 of the painting frame, and the clamping groove 91 forms a space for the die sleeve 80 to swing freely.
As shown in fig. 14, the lower side of the painting hole 421 is an inlet, and the upper side is an outlet; the painting hole 421 is sequentially divided into an inlet area 4211, a lubricating area 4212, a compression area 4213, a sizing area 4214 and an outlet area 4215 from the inlet side to the outlet side, the aperture of the painting hole 421 is sequentially reduced from the inlet area 4211 to the sizing area 4214, and the aperture of the outlet area 4215 is larger than that of the sizing area 4214.
The cross sections of the inlet area 4211, the lubricating area 4212, the compression area 4213 and the outlet area 4215 in the central axis direction of the painting hole 421 are in a trapezoid shape; the cross-sectional shape of the sizing area 4213 along the central axis of the painting hole 421 is rectangular.
That is, as shown in fig. 14, the angle between the two sides of the trapezoid of the inlet zone 4211 is A3, the angle between the two sides of the trapezoid of the lubrication zone 4212 is a2, and the angle between the two sides of the trapezoid of the compression zone 4213 is a1, wherein a1 < a2 < A3.
As shown in fig. 14, the inlet zone 4211 has a height greater than the lubrication zone 4212, the inlet zone 4211 has a height less than the compression zone 4213, and the outlet zone 4215 has a height less than the sizing zone 4214.
Claims (8)
1. A polycrystalline painting mold capable of automatically calibrating a center comprises a sintered body (40a) and a tubular mold sleeve (80) with openings at two ends, and is characterized in that a tube cavity (83) communicated with the openings at two sides is arranged in the mold sleeve (80), an annular positioning groove (81) is arranged on the lower tube body of the mold sleeve (80), and a hollow part (84) used for accommodating and fixing the sintered body (40a) is arranged at the outlet of the upper side of the tube cavity (83) of the mold sleeve (80); the sintered body (40a) comprises a polycrystalline mold core (42) arranged inside and sintered powder (44) for coating the polycrystalline mold core (42) in the sintered body, the sintered powder (44) is embedded and fixed in the hollow part (84), the polycrystalline mold core (42) is provided with paint coating holes (421) penetrating through the polycrystalline mold core up and down and communicated with the tube cavity (83), and the sintered powder (44) is provided with through holes matched with the paint coating holes (421); the painting holes (421) comprise sizing areas (4214), and the sizes of the hole diameters of the painting holes (421) except for the sizing areas (4214) are different along the direction of the central axis thereof;
the lower side of the painting hole (421) is an inlet, and the upper side is an outlet; the paint coating hole (421) is sequentially divided into an inlet area (4211), a lubricating area (4212), a compression area (4213), a sizing area (4214) and an outlet area (4215) from one inlet side to one outlet side, the aperture of the joint of the adjacent areas is the same, the aperture of the paint coating hole (421) is sequentially reduced from the inlet area (4211) to the sizing area (4214), and the aperture of the outlet area (4215) is larger than that of the sizing area (4214);
the mould also comprises a painting frame (90), wherein a plurality of strip-shaped clamping grooves (91) with one open ends are formed in the painting frame (90), and the central axes of the strip-shaped clamping grooves (91) are parallel to each other; the groove width of the strip-shaped clamping groove (91) is larger than the diameter of the positioning groove (81), the groove width of the strip-shaped clamping groove (91) is smaller than the diameter of the pipe body of the die sleeve (80), and the die sleeve (80) is movably arranged in the strip-shaped clamping groove (91) through the positioning groove (81); the painting stand (90) is also provided with fixing holes (92) for positioning itself.
2. The polycrystalline painting mold with the automatic calibration center according to claim 1, characterized in that the die sleeve (80) is further provided with a positioning concave ring (82) for auxiliary positioning on the pipe body on the upper side of the positioning groove (81); the end surface of one side of the outlet of the die sleeve (80) is planar.
3. The polycrystalline painting mold with the self-aligning center according to claim 1, wherein the cross-sectional shapes of the inlet zone (4211), the lubricating zone (4212), the compression zone (4213) and the outlet zone (4215) along the central axis of the painting hole (421) are all trapezoidal; the section of the sizing area (4213) along the central axis direction of the paint coating hole (421) is rectangular.
4. A self-aligning polycrystalline lacquer mold according to claim 3, characterized in that the height of the inlet zone (4211) is greater than the height of the lubricating zone (4212), the height of the inlet zone (4211) is less than the height of the compression zone (4213), and the height of the outlet zone (4215) is less than the height of the sizing zone (4214).
5. The polycrystalline painting mold with the self-aligning center according to claim 1, wherein a graphite sleeve (10) is used in the preparation process of the sintered body (40a) in the mold, the graphite sleeve (10) is in an integral shape, and the graphite sleeve (10) is provided with a plurality of graphite holes (11) penetrating through the body thereof from top to bottom, and the central axes of the plurality of graphite holes (11) are parallel to each other;
the process for preparing the sintered body (40a) comprises the steps of:
s1, respectively filling graphite backing rods (20) into a plurality of graphite holes (11) of a graphite sleeve (10), wherein the number of the graphite backing rods (20) is matched with that of the graphite holes (11), and the graphite backing rods (20) are fixed in the graphite holes (11);
s2, filling bottom sintering powder (41) into the graphite holes (11) filled with the graphite backing rods (20);
s3, pressing the polycrystalline mold core (42) into the bottom sintering powder (41) by using a positioning rod (50), and then pulling out the positioning rod (50);
s4, face sintering powder (43) is filled into the graphite hole (11), the face sintering powder (43) is accumulated on the upper portions of the polycrystalline mold core (42) and the bottom sintering powder (41), the polycrystalline mold core (42) and the face sintering powder (43) jointly form a to-be-sintered body (40);
s5, placing a graphite pressing rod (20) into the graphite hole (11) to enable the graphite pressing rod (20) to be pressed on the upper portion of the face sintering powder (43);
s6, placing the whole assembly formed by the graphite sleeve (10) filled with the to-be-sintered body (40), the graphite backing rod (20) and the graphite pressing rod (30) on a graphite sintering machine for sintering;
s7, after sintering, pulling out the graphite press rod (20), removing the graphite sleeve (10) from the finished sintered body in the graphite hole (11) to obtain an artificial polycrystalline diamond sintered body (40a), wherein the sintered body (40a) comprises an internal polycrystalline mold core (42) and sintered powder (44) which coats the polycrystalline mold core (42) therein;
s8, processing the sintered body (40a) by sequentially adopting laser and ultrasonic, namely processing a through hole on the sintered powder (44), processing a paint coating hole (421) on the polycrystalline mold core (42), wherein the paint coating hole (421) is communicated with the through hole.
6. The polycrystalline painting mold of the self-aligning center of claim 5, wherein: the graphite cushion rods (20) and the graphite pressure rods (30) are matched with each other in pairs to form a clamp for fixing a to-be-sintered body (40); the graphite backing rod (20) and the graphite hole (11) form interference fit; the outer diameter of the graphite pressure bar (30) is matched with the inner diameter of the graphite hole (11).
7. A polycrystalline painting mould with automatic centre calibration according to claim 5 or 6, characterized in that: the outer diameter of the positioning rod (50) is matched with the inner diameter of the graphite hole (11), a positioning ring (51) coaxial with the positioning rod (50) is arranged at the top of the positioning rod (50), a positioning groove (52) for embedding the polycrystalline mold core (42) is formed in the inner side of the positioning ring (51), and the inner size of the positioning ring (51) is matched with the size of the polycrystalline mold core (42); the positioning rod (50) enables the polycrystalline mold core (42) to be placed in the middle of the body (40) to be sintered in the horizontal direction.
8. The polycrystalline painting mold of the self-aligning center of claim 7, wherein: the bottom surface of the graphite backing rod (20) is flush with the bottom surface of the graphite sleeve (10), and one end of the graphite pressing rod (30) far away from the graphite backing rod (20) extends out of the outer side of the graphite sleeve (10); the graphite pressure bar (30) is provided with a positioning bulge (31) on the end face of one side close to the graphite pad bar (20), and the positioning bulge (31) and the graphite pressure bar (30) are coaxially arranged.
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| CN201711488587.5A CN108461211B (en) | 2017-12-29 | 2017-12-29 | Polycrystalline painting mold with automatic center calibration function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711488587.5A CN108461211B (en) | 2017-12-29 | 2017-12-29 | Polycrystalline painting mold with automatic center calibration function |
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| CN108461211B true CN108461211B (en) | 2020-09-18 |
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| CN105562692A (en) * | 2016-03-03 | 2016-05-11 | 中国科学院物理研究所 | Sintering mold |
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| CN201673733U (en) * | 2010-04-30 | 2010-12-15 | 浙江金平拉丝模有限公司 | Vertical gem painting die |
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