CN108314036B - Preparation process of artificial diamond sintered body - Google Patents
Preparation process of artificial diamond sintered body Download PDFInfo
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- CN108314036B CN108314036B CN201711488453.3A CN201711488453A CN108314036B CN 108314036 B CN108314036 B CN 108314036B CN 201711488453 A CN201711488453 A CN 201711488453A CN 108314036 B CN108314036 B CN 108314036B
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Abstract
The invention relates to a preparation process of an artificial diamond sintered body. The preparation process comprises the following steps: firstly, respectively filling and fixing graphite backing rods into a plurality of graphite holes of a graphite sleeve, and filling bottom sintering powder into the graphite holes; pressing the polycrystalline mold core into bottom sintering powder by using a positioning rod, and filling face sintering powder into the graphite hole, wherein the bottom sintering powder, the polycrystalline mold core and the face sintering powder jointly form a to-be-sintered body; putting a graphite pressing rod into the graphite hole, and pressing the graphite pressing rod on the upper part of the face sintering powder; sintering a combination consisting of the graphite sleeve, the graphite backing rod and the graphite pressing rod on a graphite sintering machine; and removing the graphite sleeve from the finished sintered body in the graphite hole to obtain the artificial polycrystalline diamond sintered body. The preparation process can not only realize the purpose of sintering the painting molds in batches, but also ensure that the sintering temperature of each sintered body is consistent and uniform, and the hardness and the strength of the sintered bodies in the same batch are ensured.
Description
Technical Field
The invention belongs to the technical field of preparation of painting dies, and particularly relates to a preparation process of an artificial diamond sintered body.
Background
In the prior art, when a polycrystalline painting mold is processed and prepared, a plurality of graphite die sleeves (usually 8 graphite die sleeves are in one batch) which are individually filled with a to-be-sintered body are placed on a sintering positioning base plate together for sintering, the individual graphite die sleeves do not contact with each other, and after sintering is finished, the to-be-sintered body in the graphite die sleeves is changed into a sintered body. In the sintering structure, because the graphite die sleeves are not in contact with each other, a single graphite die sleeve can generate large temperature difference in the sintering process, so that the hardness of sintered bodies in 8 graphite die sleeves is lower than the normal hardness, the hardness of the sintered bodies is higher than the normal hardness, the density of the sintered bodies is unbalanced, the strength of the sintered bodies cannot be guaranteed, and potential quality hazards are left for painting dies.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a preparation process of an artificial diamond sintered body, the preparation process not only can realize the purpose of sintering painting molds in batches, but also ensures that the sintering temperature of each sintered body is consistent and uniform, 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 mold sleeve in the prior art is avoided.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the preparation process uses the graphite sleeve, the graphite sleeve is in an integral shape, the graphite sleeve is provided with a plurality of graphite holes penetrating through the graphite sleeve body from top to bottom, and the central axes of the graphite holes are parallel to each other;
the preparation process 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;
and S7, after sintering, pulling out the graphite pressing rod, and removing the graphite sleeve from the finished sintered body in the graphite hole to obtain the artificial polycrystalline diamond sintered body.
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 side of the graphite sleeve is provided with a temperature measuring point.
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 minimum spacing between the walls of adjacent graphite pores is > 3.5 mm.
Preferably, the bottom surface of the graphite backing rod is flush with the bottom surface of the graphite sleeve, and one end, far away from the graphite backing rod, of the graphite pressing rod extends out of the outer side of the graphite sleeve.
Preferably, a positioning protrusion is arranged on the end face of one side, close to the graphite backing rod, of the graphite pressing rod, and the positioning protrusion and the graphite pressing rod are coaxially arranged.
The invention has the beneficial effects that:
1) the invention adopts the graphite sleeve in an integral shape, and the graphite sleeve is provided with a plurality of graphite holes penetrating through the graphite sleeve 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.
2) The clamp 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.
3) 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.
4) 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.
5) 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。
6) The artificial polycrystalline diamond has high hardness and good wear resistance, but has large brittleness, small size and poorer compressive strength and shock resistance, so the polycrystalline mold core cannot be directly embedded into a 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.
Drawings
Fig. 1 is a schematic structural view of a porous graphite sleeve.
Fig. 2 is a schematic sectional view taken along line a-a of fig. 1.
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.
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
40 a-artificial polycrystalline diamond 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
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, as shown in figure 4.
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.
Claims (3)
1. The preparation process of the artificial diamond sintered body is characterized in that a graphite sleeve (10) is used in the preparation process, 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 the central axes of the graphite holes (11) are parallel to each other;
the preparation process comprises the following steps:
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), and removing the finished sintered body in the graphite hole (11) from the graphite sleeve (10) to obtain an artificial polycrystalline diamond sintered body (40 a);
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 pressing rod (30) is matched with the inner diameter of the graphite hole (11);
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;
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.
2. The process for producing a sintered artificial diamond body according to claim 1, wherein: and a temperature measuring point (12) is arranged on the outer side of the graphite sleeve (10).
3. The process for producing a sintered artificial diamond body according to claim 2, wherein: the minimum distance between the hole walls of the adjacent graphite holes (11) is more than 3.5 mm.
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| CN101912965A (en) * | 2010-07-03 | 2010-12-15 | 广东奔朗新材料股份有限公司 | Die for sintering diamond tool bits and method for manufacturing diamond tool bits |
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