Compaction device applied to special-shaped inner core of polycrystalline diamond compact

Abstract

The compaction device applied to the special-shaped inner core of the polycrystalline diamond compact comprises an outer mold, a cavity is formed in the outer mold, an inner mold is embedded in the cavity in a matched mode, a first special-shaped tooth model is arranged at one end of the inner mold, a metal cup is arranged on the first special-shaped tooth model, a second special-shaped tooth model is arranged at the cup bottom of the metal cup, and a first special-shaped tooth model is arranged on the second special-shaped tooth model. The first special-shaped tooth model and the second special-shaped tooth model are matched in shape, compared with a complex integrally-formed mold, the split type mold is adopted, machining and manufacturing are simpler, the part with the corresponding shape is independently molded, the machining difficulty of the mold is reduced, and cost is low; the matching condition of the special-shaped inner core and the mold can be directly observed so as to ensure that the mold and the special-shaped inner core are completely attached without dislocation, and the yield is improved through visible operation; high-pressure pressing is carried out, and the outer mold restrains the special-shaped inner core, so that the outer circle of the special-shaped inner core does not expand and is not prone to deformation; operation is simple and reliable, and repeatability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of compaction of special-shaped inner cores in the production and manufacturing process of polycrystalline diamond compacts (PDC), and specifically relates to a compaction device applied to special-shaped inner cores of polycrystalline diamond compacts. Background Art

[0002] As a high-performance superhard material, polycrystalline diamond compact (PDC) has been continuously expanding its application fields, especially in industries such as oil drilling, geological exploration, and machining. With the development of oil and gas resources and the progress of drilling technology, oil wells are getting deeper and more complex geological conditions are encountered. The original conventional planar composite chips are difficult to drill to the bottom in one go, which greatly affects the drilling efficiency. For different strata, diamond composite chips with special-shaped inner cores can effectively improve the drilling efficiency, so the special-shaped inner cores have been widely promoted. However, in the production process, the first-pass synthesis yield of special-shaped inner cores is extremely low.

[0003] The reason is that due to the various shapes of the special-shaped teeth of the special-shaped inner cores, when using an integrally formed mold, it is impossible to see the matching situation between the special-shaped inner core and the mold, and misalignment is likely to occur. The misplacement and skew of the special-shaped inner core result in a very high scrap rate. Moreover, due to the complex shape inside the mold, the mold processing is difficult, and in the production and manufacturing process, it is easy to cause damage due to the diamond micropowder not being compacted or the misalignment between the mold and the special-shaped inner core, resulting in a high scrap rate.

[0004] Application No. CN202021929319.X discloses a special-shaped PDC laser engraving processing equipment, which uses a laser to cut the workpiece to obtain the required special-shaped tooth shape, with a high production cost.

[0005] Therefore, the technical problem to be solved by the utility model is that due to the various shapes of the special-shaped teeth, when using an integrally formed mold, it is impossible to see the matching situation between the special-shaped inner core and the mold, and misalignment is likely to occur. The misplacement and skew of the special-shaped inner core result in a very high scrap rate. Moreover, due to the complex shape inside the mold, the mold processing is difficult and the production cost is high. Summary of the Utility Model

[0006] To solve the above-mentioned technical problems, the utility model provides a compaction device applied to special-shaped inner cores of polycrystalline diamond compacts.

[0007] The specific scheme is as follows:

[0008] A compaction device applied to special-shaped inner cores of polycrystalline diamond compacts includes an outer mold. A cavity is provided inside the outer mold, and an inner mold is fittingly embedded in the cavity. One end of the inner mold is provided with a first special-shaped tooth shape, a metal cup is provided on the first special-shaped tooth shape, and a second special-shaped tooth shape is provided at the bottom of the metal cup. The first special-shaped tooth shape and the second special-shaped tooth shape are in conformity with each other.

[0009] The outer mold, the cavity, and the inner mold are all in the shape of a cylinder, and the first end of the inner mold is provided with a first special-shaped tooth profile.

[0010] The diameter of the inner mold is 0 - 0.1 mm less than the inner diameter of the outer mold.

[0011] The outer mold is arranged on the base. The base includes a circular bottom plate, and a cylindrical boss is provided at the center of the circular bottom plate. The cylindrical boss can be embedded into the cavity of the outer mold.

[0012] The diameter of the cylindrical boss is the same as the diameter of the inner mold, and the diameter of the cylindrical boss is 0 - 0.1 mm less than the inner diameter of the outer mold.

[0013] It further includes a spacer. The spacer is circular, and a U-shaped groove is provided on the spacer. The U-shaped groove includes a semi-circular groove and a rectangular groove. The semi-circular groove is concentric with the spacer. One side of the rectangular groove completely coincides with the straight edge of the semi-circular groove, and the two adjacent sides extend parallel to the edge of the spacer. The diameter of the semi-circular groove is the same as the inner diameter of the outer mold, and is 0 - 0.1 mm larger than the diameter of the inner mold and the diameter of the cylindrical boss.

[0014] The height of the cylindrical boss is greater than the thickness of one spacer.

[0015] The metal cup contains diamond micropowder, and a metal matrix is placed on the diamond micropowder. The metal cup, the diamond micropowder, and the metal matrix together form a special-shaped inner core. Let the height of the cylindrical boss be h1, the height of the outer mold be h2, the height of the inner mold be h3, the height of the spacer be h4, and the height of the special-shaped inner core be h5. When using the three molds of the base, the outer mold, and the inner mold, the condition h2 ≤ h1 + h3 needs to be satisfied.

[0016] When using the four molds of the base, the outer mold, the inner mold, and the spacer, the condition h2 + h4 ≥ h1 + h3 + 1 / 2 * h5 needs to be satisfied.

[0017] The beneficial effects compared with the prior art are as follows:

[0018] Compared with the complex integral molding mold, the utility model adopts a split mold, which is simpler in processing and manufacturing. The parts corresponding to the morphology are molded separately, reducing the processing difficulty of the mold and having a low cost. The cooperation between the special-shaped inner core and the mold can be directly observed to ensure that the mold and the special-shaped inner core are completely fitted without misalignment. The visible operation improves the yield rate. With high-pressure pressing and the outer mold restricting the special-shaped inner core, the outer circle of the special-shaped inner core does not expand and is not easily deformed. The operation is simple and reliable with good repeatability. Brief Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the four parts of the utility model scattered.

[0020] Figure 2 It is a schematic diagram of the assembly of three parts of the present utility model.

[0021] Figure 3 It is a schematic diagram of the assembly of four parts of the present utility model.

[0022] Among them, the base 1, the cylindrical boss 11, the outer mold 2, the inner mold 3, the first special-shaped surface 31, the cushion block 4, the U-shaped groove 41, the inclined surface 411, the metal cup 5, the second special-shaped surface 51 Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.

[0024] For the flat polycrystalline diamond composite sheet inner core, a flat indenter can be directly used for pressing. For example, in the patent with the publication number CN218873724U, the inner core is pressed by the upper and lower indenters. However, during the processing of the special-shaped inner core, it is necessary to align the special-shaped teeth of the special-shaped inner core with the mold, so there is a problem of misalignment in the fit, resulting in a low yield of the first synthesis. The present utility model adopts a split mold. Only by replacing the inner mold with different special-shaped tooth shapes can the special-shaped inner cores with different special-shaped tooth shapes be pressed. It is simple and convenient to use. And before pressing, it can be observed whether the special-shaped teeth of the special-shaped inner core are aligned with the mold. If not, adjustments can be made until they are aligned. In this way, the problem of misalignment in the fit is avoided. When pressing, the outer mold is used to restrain the special-shaped inner core to ensure that the outer circle of the special-shaped inner core does not expand, improving the yield of the first synthesis.

[0025] It should be noted that the present utility model only provides a special-shaped inner core with a special-shaped tooth profile. In practice, a second special-shaped tooth profile 51 identical to the required special-shaped tooth profile is provided at the bottom of the metal cup 5, and a first special-shaped tooth profile 31 that fits with the second special-shaped tooth profile 51 is provided at the head end of the inner mold 3. By replacing the metal cup 5 and the inner mold 3 with different special-shaped tooth shapes, special-shaped inner cores with different special-shaped tooth shapes can be prepared. The base 1, the outer mold 2, and the cushion block 4 do not need to be replaced, improving the versatility.

[0026] Such as Figures 1-3As shown in the figure, the present utility model provides a compaction device for an irregular inner core of a polycrystalline diamond compact, including an outer mold 2. A cavity is provided inside the outer mold 2, and an inner mold 3 is fitted and embedded in the cavity. A first irregular tooth shape 31 is provided at one end of the inner mold 3, and a metal cup 5 is provided on the first irregular tooth shape 31. A second irregular tooth shape 51 is provided at the bottom of the metal cup 5. The first irregular tooth shape 31 and the second irregular tooth shape 51 are in conformity with each other in shape. As Figure 1 The right figure of the first row shows the metal cup 5.

[0027] Compared with complex integral molding dies, the present utility model adopts a split die. The processing and manufacturing are simpler. The parts corresponding to the morphology are molded separately, reducing the processing difficulty of the die and having a low cost. The cooperation between the irregular inner core and the die can be directly observed to ensure that the die and the irregular inner core are completely fitted without dislocation. The visible operation improves the yield rate. High-pressure pressing and the constraint of the outer mold on the irregular inner core make the outer circle of the irregular inner core not expand and not easily deform. The operation is simple and reliable with good repeatability.

[0028] As Figure 1 shown, the outer mold 2, the cavity, and the inner mold 3 are all in a cylindrical shape, and a first irregular tooth shape 31 is provided at the head end of the inner mold 3. When manufacturing an irregular inner core with a complex shape, by using the inner mold 3 that is in conformity with the irregular tooth shape of the irregular inner core, the problem of damage caused by the misalignment of the die and the irregular teeth is effectively solved. Moreover, by using inner molds 3 with different irregular tooth shapes, irregular inner cores that are in conformity with their shapes can be prepared.

[0029] The diameter of the inner mold 3 is 0 - 0.1 mm less than the inner diameter of the outer mold 2, preferably 0. The inner mold 3 can be embedded into the cavity of the outer mold 2. During the pressing process, the outer mold 2 constrains the irregular inner core, avoiding the deformation problem that may occur during the compaction process.

[0030] As Figures 1-3 shown, the outer mold 2 is arranged on a base 1. The base 1 includes a circular bottom plate, and a cylindrical boss 11 is provided at the center of the circular bottom plate. The cylindrical boss 11 can be embedded into the cavity of the outer mold 2. The position of the outer mold 2 is fixed by the provided cylindrical boss 11, and at the same time, the inner mold 3 is supported, providing an installation position for a spacer 4.

[0031] The diameter of the cylindrical boss 11 is the same as the diameter of the inner mold 3. The diameter of the cylindrical boss 11 is 0 - 0.1 mm less than the inner diameter of the outer mold 2, preferably 0. Both can be embedded into the cavity of the outer mold 2.

[0032] As Figure 1As shown in the middle figure of the first row, it further includes a spacer block 4. The spacer block 4 is circular, and a U-shaped groove 41 is provided on the spacer block 4. The U-shaped groove 41 includes a semi-circular groove and a rectangular groove. The semi-circular groove is concentric with the spacer block 4. One side of the rectangular groove completely coincides with the straight edge of the semi-circular groove, and the two adjacent sides extend parallel to the edge of the spacer block 4. The diameter of the semi-circular groove is the same as the inner diameter of the outer mold 2, which is greater than the diameter of the inner mold 3 and the diameter of the cylindrical boss 11 by 0 - 0.1 mm, preferably 0, so that the cylindrical boss 11 can be embedded into the U-shaped groove 41 on the spacer block 4 to install the spacer block 4. A height difference is formed between the outer mold 2 and the inner mold 3, and the height difference is determined by the height of the spacer block 4. By adjusting the height of the spacer block 4, the matching depth between the special-shaped inner core and the outer mold 2 can be adjusted to be compatible with special-shaped inner cores of different height specifications.

[0033] The height of the cylindrical boss 11 is greater than the thickness of one spacer block 4, so that after the spacer block 4 is installed, a part of the cylindrical boss 11 is still located in the cavity of the outer mold 2 to fix the position of the outer mold 2.

[0034] At the end edge of the U-shaped groove 41, that is, at the junction of the rectangular groove and the edge of the spacer block 4, there is an inclined surface 411 with an angle of 45 degrees, which is convenient for the spacer block 4 to be pushed in from one side of the base 1, playing a role of lead, and at the same time removing sharp edges and corners to avoid scratching the cylindrical boss 11.

[0035] Diamond micropowder is placed in the metal cup 5, and a metal matrix is placed on the diamond micropowder. The metal cup 5, diamond micropowder, and metal matrix together form a special-shaped inner core; let the height of the cylindrical boss 11 be h1, the height of the outer mold 2 be h2, the height of the inner mold 3 be h3, and the height of the spacer block 4 be h4; when using three molds, namely the base 1, outer mold 2, and inner mold 3, the condition h2 ≤ h1 + h3 needs to be satisfied; when using four molds, namely the base 1, outer mold 2, inner mold 3, and spacer block 4, the condition h2 + h4 ≥ h1 + h3 + 1 / 2 * h5 needs to be satisfied.

[0036] When the three molds of the base 1, outer mold 2, and inner mold 3 are combined, the first end of the inner mold 3 is exposed. By placing the special-shaped inner core on the inner mold 3, the fitting and alignment state between the inner mold 3 and the special-shaped inner core can be directly observed to ensure that there is no misalignment in their cooperation; when the four molds of the base 1, outer mold 2, inner mold 3, and spacer block 4 are combined, during the pressing process, the force is axial and there is no radial force. The radial expansion amount is within the mold tolerance. During pressing, the special-shaped inner core is constrained by the outer mold 2 to ensure that the outer circle of the inner core does not expand.

[0037] Due to the small thickness and good ductility of the metal cup 5, using only the metal cup 5 to constrain the material has limited binding force. In actual situations, there is flowing diamond micropowder inside the special-shaped inner core, and the maximum height of the diamond micropowder is 5 mm. During pressing, the special-shaped inner core is placed inside the outer mold 2, and the outer mold 2 can constrain the outer circle of the diamond micropowder from expanding. No matter how high the special-shaped inner core is, as long as it is ensured that the diamond micropowder inside the special-shaped inner core is inside the outer mold 2, the outer mold 2 can constrain the special-shaped inner core to ensure that it does not deform during the pressing process.

[0038] Due to the requirement of the tolerance fit of the mold, the outer diameter of the inner mold 2 is the same as the outer diameter of the metal cup 5, or the outer diameter of the inner mold 2 is slightly larger than the outer diameter of the metal cup 5.

[0039] The specific working process of the present utility model is as follows:

[0040] Place the base 1, place the outer mold 2 on the base 1, so that the cylindrical boss 11 on the base 1 is inserted into the cavity of the outer mold 2 from below, insert the inner mold 3 into the cavity of the outer mold 2 from above, so that the tail end of the inner mold 3 contacts the cylindrical boss 11, and the first special-shaped tooth profile 31 at the head end of the inner mold 3 faces upward. At this time, the first special-shaped tooth profile 31 of the inner mold 3 is exposed, and the first special-shaped tooth profile 31 can be observed. Place the metal cup 5 on the first special-shaped tooth profile 31 and observe whether the second special-shaped tooth profile 51 at the bottom of the metal cup 5 fits and aligns with the first special-shaped tooth profile 31. If there is a dislocation, adjust it until it is aligned; after the inner mold 3 and the metal cup 5 are aligned, put diamond micropowder into the metal cup 5, and put a metal matrix on the diamond micropowder;

[0041] Lift the outer mold 2 upward so that there is a gap between the bottom of the outer mold 2 and the circular bottom plate of the base 1, and insert a spacer block 4 at this gap so that the cylindrical boss 11 is inserted into the semi-circular groove of the spacer block 4 to install the spacer block 4. At this time, the outer mold 2 blocks the inner mold 3 and a part of the height of the metal cup 5 due to the increased position, covering at least half of the special-shaped inner core. The outer mold 2 wraps the outer circle of the metal cup 5 and constrains it, so that the outer circle of the special-shaped inner core does not expand during pressing, and a hydraulic device is used to press the special-shaped inner core to obtain a polycrystalline diamond composite sheet special-shaped inner core with a second special-shaped tooth profile 51.

[0042] The utility model provides specific dimensions of a special-shaped inner core and a mold, wherein a base 1 has a diameter of 50 mm, a bottom plate height of 5 mm, a cylindrical boss 11 has a diameter of 15.2 mm, and a height of 16 mm; an outer mold 2 has an inner diameter of 15.3 mm, an outer diameter of 25.3 mm, and a height of 41.5 mm; an inner mold 3 has a diameter of 15.2 mm, and a height of 25.5 mm. In the present embodiment, a first special-shaped tooth shape 31 of the inner mold 3 is recessed inwardly, and the height here refers to the height from the plane of the inner mold 3 to the lowest point of the first special-shaped tooth shape 31; a cushion block 4 has a diameter of 40 mm, a height of 6 mm, a semicircular groove having a diameter of 15.3 mm, and a rectangular groove having a width of 15.3 mm; a metal cup has a height of 8 mm-16 mm, and the height of the diamond micropowder 6 inside is 5 mm at most.

[0043] The cylindrical boss 11 and the inner mold 3 can be inserted into the cavity of the outer mold 2, and the cylindrical boss 11 can be inserted into the semicircular groove of the cushion block 4. When the three molds of the base 1, the outer mold 2 and the inner mold 3 are used, the height of the outer mold 2 is 41.5 mm, which is equal to the sum of the height of the cylindrical boss 11 and the height of the inner mold 3, that is, the first special-shaped tooth shape 31 of the inner mold 3 is exposed to the outside, and the metal cup 5 is placed on the first special-shaped tooth shape 31 to observe whether the second special-shaped tooth shape 51 on the bottom of the metal cup 5 fits and aligns with the first special-shaped tooth shape 31. If misaligned, adjust until they are aligned;

[0044] When using four molds of base 1, outer mold 2, inner mold 3 and pad 4, the sum of the height of outer mold 2 and the height of pad 4 (47.5 mm) is greater than the sum of the height of cylindrical boss 11 and the height of inner mold 3 (41.5 mm). After placing metal cup 5, metal cup 5 is constrained by 6 mm inside outer mold 2, while the height of diamond powder 6 is up to 5 mm. Therefore, this part is completely constrained by outer mold 2, so it will not be deformed during pressing.

[0045] By using the inner mold 2 with different special-shaped tooth shapes, a special-shaped inner core corresponding to the shape can be prepared. The outer mold 2, the cushion block 4, and the base 1 can all be used universally. Only the inner mold 3 needs to be replaced and the compaction process is carried out to compact the special-shaped inner core of any shape, thereby improving the versatility.

[0046] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A compacting device for a polycrystalline diamond composite sheet with a special-shaped inner core, characterized in that: The invention comprises an outer mold (2), wherein a cavity is provided inside the outer mold (2), an inner mold (3) is fitted in the cavity, a first special-shaped tooth shape (31) is provided at one end of the inner mold (3), a metal cup (5) is provided on the first special-shaped tooth shape (31), a second special-shaped tooth shape (51) is provided at the bottom of the metal cup (5), and the first special-shaped tooth shape (31) and the second special-shaped tooth shape (51) are consistent in shape.

2. The compacting device for the special-shaped inner core of polycrystalline diamond composite sheet according to claim 1, characterized in that: The outer mold (2), the cavity, and the inner mold (3) are all cylindrical in shape, and the inner mold (3) is provided with a first special-shaped tooth shape (31) at the front end and a flat surface at the rear end.

3. The compacting device for the special-shaped inner core of polycrystalline diamond composite sheet according to claim 1, characterized in that: The diameter of the inner mold (3) is 0-0.1 mm smaller than the inner diameter of the outer mold (2).

4. The compacting device for the special-shaped inner core of polycrystalline diamond composite sheet according to claim 1, characterized in that: The outer mold (2) is arranged on a base (1), and the base (1) comprises a circular bottom plate, a cylindrical boss (11) is provided at the center of the circular bottom plate, and the cylindrical boss (11) can be embedded in the cavity of the outer mold (2).

5. The compacting device for the special-shaped inner core of polycrystalline diamond composite sheet according to claim 4, characterized in that: The diameter of the cylindrical boss (11) is the same as the diameter of the inner mold (3), and the diameter of the cylindrical boss (11) is 0-0.1 mm smaller than the inner diameter of the outer mold (2).

6. The compacting device for the special-shaped inner core of polycrystalline diamond composite sheet according to claim 1, characterized in that: The invention also comprises a cushion block (4), wherein the cushion block (4) is circular and has a U-shaped groove (41) formed thereon, wherein the U-shaped groove (41) comprises a semicircular groove and a rectangular groove, wherein the semicircular groove is concentric with the cushion block (4), one side of the rectangular groove completely coincides with the straight side of the semicircular groove, and two adjacent sides extend in parallel to the edge of the cushion block (4), and the diameter of the semicircular groove is the same as the inner diameter of the outer mold (2) and is 0-0.1 mm larger than the diameter of the inner mold (3) and the diameter of the cylindrical boss (11).

7. The compacting device for the special-shaped inner core of polycrystalline diamond composite sheet according to claim 5, characterized in that: The height of the cylindrical boss (11) is greater than the thickness of a cushion block (4).

8. The compacting device for the special-shaped inner core of polycrystalline diamond composite sheet according to claim 1, characterized in that: Diamond micropowder is placed in the metal cup (5), a metal matrix is ​​placed on the diamond micropowder, and the metal cup (5), the diamond micropowder and the metal matrix together constitute a special-shaped inner core; The height of the cylindrical boss (11) is h1, the height of the outer mold (2) is h2, the height of the inner mold (3) is h3, the height of the cushion block (4) is h4, and the height of the special-shaped inner core is h5; When using the three molds of the base (1), the outer mold (2) and the inner mold (3), the condition h2≤h1+h3 must be met; When using four molds, namely the base (1), the outer mold (2), the inner mold (3) and the spacer (4), the condition h2+ h4 ≥ h1+ h3+1 / 2* h5 must be met.

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