A sealed decobalt device, method, assembly apparatus and polycrystalline diamond compact

Abstract

The application discloses a sealing decobalt device, method, assembling equipment and polycrystalline diamond compact, the device comprises a packaging mechanism, a clamping mechanism, a composite sealing ring and a containing mechanism; the clamping mechanism is arranged in the packaging mechanism, and the clamping mechanism is used for clamping a workpiece to be decobalted; the composite sealing ring is embedded on the top of the clamping mechanism, and the composite sealing ring is sleeved on the workpiece to be decobalted; the composite sealing ring comprises a first sealing body and a second sealing body embedded on the inner side wall of the first sealing body, and the second sealing body is sleeved on the outer wall of the composite layer or the junction between the composite layer and the base body; the first sealing body is used for blocking the decobalt reagent; the material of the second sealing body is a material that can react with the decobalt reagent or a material that does not react with the decobalt reagent; the containing mechanism is arranged in the packaging mechanism, and the bottom of the containing mechanism is tightly pressed against the top surface of the first sealing body; the containing mechanism is provided with an inner cavity for containing the decobalt reagent; the inner cavity is communicated with the top surface of the composite layer; and the application has the advantages of improving the isolation performance of the alloy part of the compact to the decobalt reagent, reducing the corrosion effect and improving the product quality.

Description

Technical Field

[0001] This application relates to the field of cobalt removal technology, and in particular to a sealed cobalt removal device, method, assembly equipment, and polycrystalline diamond composite sheet. Background Technology

[0002] Polycrystalline diamond composites, as key components in crude oil and natural gas extraction and as materials that directly shear and crush rock structures, play a decisive role in the overall drilling efficiency of drill bits. Due to the extreme nature of underground drilling conditions, polycrystalline diamond composite layers need to possess the best material properties to achieve extraction tasks, including extremely high hardness, toughness, and thermal stability.

[0003] Polycrystalline diamond composite (PDC) is an ultra-hard composite material used in oil and gas drilling and mineral mining. It is necessary to remove cobalt from the diamond layer to improve its wear resistance and impact resistance. However, existing cobalt removal devices for composites use a sealing ring to isolate the cobalt removal reagent (i.e., the acid required for cobalt removal) during sealed cobalt removal, so that the acid only comes into contact with the cobalt layer to be removed from the composite. However, some acid still penetrates the sealing ring, resulting in poor acid isolation performance. This causes a certain degree of corrosion to the surface of the alloy parts of the composite. Grinding is still required to meet the surface requirements of the product, resulting in a lower quality and shorter service life of the final composite. Summary of the Invention

[0004] The main objective of this application is to provide a sealed cobalt removal device, method, assembly equipment, and polycrystalline diamond composite sheet, aiming to solve the technical problem that the existing diamond composite sheet cobalt removal device has poor isolation performance for the cobalt removal reagent, resulting in low surface quality of the final diamond composite sheet.

[0005] To achieve the above objectives, this application provides a sealed cobalt removal device, including a packaging mechanism, a clamping mechanism, a composite sealing ring, and a holding mechanism. The clamping mechanism is disposed within the packaging mechanism and is used to clamp the workpiece to be removed from the cobalt. The workpiece to be removed from the cobalt includes a substrate and a composite layer connected to the top of the substrate. The composite sealing ring is embedded in the top of the clamping mechanism and is fitted onto the workpiece to be removed from the cobalt. The composite sealing ring includes a first sealing body and a second sealing body embedded in the inner wall of the first sealing body. The second sealing body is fitted onto the outer wall of the composite layer or at the junction of the composite layer and the substrate. The first sealing body is used to block the cobalt removal reagent, and the material of the second sealing body is a material that can react with or not react with the cobalt removal reagent. The holding mechanism is disposed within the packaging mechanism, and the bottom of the holding mechanism is pressed against the top surface of the first sealing body. The holding mechanism has an inner cavity for holding the cobalt removal reagent, and the inner cavity communicates with the top surface of the composite layer.

[0006] Optionally, a barrier component is provided inside the cavity, with the bottom of the barrier component pressed against a portion of the top surface of the composite layer, so that the exposed area of ​​the top surface of the composite layer is the reaction area in contact with the cobalt removal reagent.

[0007] Optionally, the barrier assembly includes a clamping post and an isolation sleeve, with the top of the clamping post abutting against the inner top of the inner cavity; the isolation sleeve is disposed at the bottom of the clamping post and fits against a portion of the top surface of the composite layer.

[0008] Optionally, a positioning assembly is provided on the outer wall of the clamping column. The positioning assembly includes multiple positioning blocks connected to the outer wall of the clamping column. The positioning blocks are all fitted to the inner wall of the inner cavity, and adjacent positioning blocks are arranged at intervals.

[0009] Optionally, the outer wall of the positioning block is provided with an external thread, and the inner wall of the inner cavity is provided with an internal thread that mates with the external thread.

[0010] Optionally, the holding mechanism includes a receiving block and a sealing cover, with an inner cavity opened inside the receiving block, the bottom of the receiving block pressed against the top surface of the first sealing body; the sealing cover is detachably connected to the top of the receiving block.

[0011] Optionally, the encapsulation mechanism includes a base, a clamping sleeve, and an encapsulation cover. The base has a receiving cavity with a top opening, and the clamping mechanism is located at the bottom of the receiving cavity. The clamping sleeve has a hollow structure, and the lower section of the clamping sleeve is threaded onto the outer wall of the base, while the upper section of the clamping sleeve is threaded onto the outer wall of the mounting block. The encapsulation cover is threaded onto the outer wall of the clamping sleeve so that the encapsulation cover is pressed against the top of the sealing cover.

[0012] Optionally, the outer wall of the mounting block is provided with a limiting step, and the clamping sleeve is provided with a clamping boss that cooperates with the limiting step.

[0013] Optionally, the clamping mechanism includes at least two detachably connected clamping blocks, the inner wall of which is provided with a clamping groove for clamping the workpiece to be decobalt removed, and the top of the clamping block is provided with a stepped groove for embedding a composite sealing ring.

[0014] Optionally, the top surface of the workpiece to be decobaltized protrudes relative to the top surface of the first sealing body, and the height of the protrusion is H, where H = 600-800 μm.

[0015] To achieve the above objectives, this application also provides a cobalt removal method, based on the aforementioned sealed cobalt removal apparatus, comprising the following steps:

[0016] The workpiece to be decobalt removed is clamped in the sealed decobalt removal device by the clamping mechanism, and the sealed decobalt removal device is then encapsulated.

[0017] The sealed cobalt removal device after encapsulation is heated to a temperature of 50–350°C.

[0018] Remove the heated, sealed cobalt removal device and cool it to room temperature;

[0019] Remove the packaging cap and sealing cap to pour out the cobalt removal reagent inside the cavity;

[0020] Continue disassembling the clamping sleeve, bearing block, barrier assembly, and clamping mechanism to remove the cobalt-free workpiece.

[0021] Optionally, the workpiece to be decobalt removed is clamped in the sealed decobalt removal device using a clamping mechanism, and the sealed decobalt removal device is then encapsulated, including:

[0022] The workpiece to be decobalt removed is pre-clamped by a clamping mechanism, and a composite sealing ring is installed on the top of the clamping mechanism so that the composite sealing ring is fitted onto the workpiece to be decobalt removed.

[0023] The clamping mechanism holding the workpiece to be decobalt removed is placed entirely at the bottom of the receiving cavity of the base;

[0024] Install the mounting block so that the bottom of the mounting block is pressed against the top surface of the first sealing body;

[0025] Install the clamping sleeve to clamp the mounting block;

[0026] A barrier component is installed inside the cavity of the mounting block so that the bottom of the barrier component is pressed against a portion of the top surface of the composite layer.

[0027] Add an appropriate amount of cobalt removal reagent into the inner cavity;

[0028] Install a sealing cap on top of the mounting block to form a sealed cavity inside;

[0029] Install the encapsulation cap to press the sealing cap in place, thus completing the encapsulation of the sealed cobalt removal device.

[0030] To achieve the above objectives, this application also provides an assembly device for assembling the aforementioned sealed cobalt removal device, including a workbench. The workbench is equipped with a first assembly mechanism, an acid injection mechanism, a capping mechanism, and a second assembly mechanism. A first industrial robotic arm and a second industrial robotic arm are respectively arranged on both sides of the workbench. The first industrial robotic arm is used to clamp a clamping sleeve and pre-install the clamping sleeve onto a pre-assembly fixture to obtain a semi-finished fixture. The pre-assembly fixture is located on the workbench and consists of a clamping mechanism pre-installed within a base. The device comprises a composite sealing ring, a workpiece to be decobalt removed, and a mounting block forming a tooling; a first assembly mechanism for tightening the clamping sleeve to the outer wall of the base; an acid injection mechanism for injecting decobalt removal reagent into the inner cavity of the semi-finished tooling; a capping mechanism for pressing the sealing cap onto the top of the mounting block of the semi-finished tooling after the decobalt removal reagent has been injected, to obtain a sealed tooling; a second industrial robotic arm for clamping the encapsulation cap and pre-installing the encapsulation cap onto the clamping sleeve of the sealed tooling; and a second assembly mechanism for tightening the encapsulation cap to the outer wall of the clamping sleeve, ultimately obtaining a sealed decobalt removal device.

[0031] Optionally, it also includes a first transport mechanism, a second transport mechanism, and a transfer mechanism. The first transport mechanism is used to move the semi-finished tooling sequentially along the workstations corresponding to the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism, and the capping mechanism. The second transport mechanism is used to move the sealing tooling to the workstation corresponding to the second assembly mechanism. The transfer mechanism is used to transfer the sealing tooling from the first transport mechanism to the second transport mechanism.

[0032] Optionally, the first transport mechanism includes a fixed frame, a movable platform, a first drive mechanism, a first telescopic mechanism, a lifting platform, and at least one first mechanical gripper. The fixed frame is disposed at the bottom of the worktable; the movable platform is slidably disposed on the fixed frame; the first drive mechanism is disposed on the fixed frame and is used to drive the movable platform to slide laterally on the fixed frame; the first telescopic mechanism is disposed at the bottom of the movable platform, and the telescopic end of the first telescopic mechanism moves through the movable platform; the lifting platform is disposed at the top of the first telescopic mechanism; the first mechanical gripper is disposed at the top of the lifting platform and is used to grip pre-assembled tooling and / or semi-finished tooling. A strip groove is provided on the worktable for the first mechanical gripper to pass through. The strip groove is parallel to the sliding direction of the movable platform and covers the workstations corresponding to the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism, and the capping mechanism.

[0033] Optionally, the transfer mechanism includes a support frame, a second telescopic mechanism, a second mechanical gripper, and a second drive mechanism. The support frame is disposed on the worktable and is located between the first transport mechanism and the second transport mechanism. The second telescopic mechanism is slidably disposed on the support frame. The second mechanical gripper is disposed at the bottom of the second telescopic mechanism and is used to clamp the sealing fixture. The second drive mechanism is disposed on the support frame and is used to drive the second telescopic mechanism to slide laterally on the support frame.

[0034] Optionally, at least one set of positioning seats is provided on the worktable corresponding to the workstations of the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism, the capping mechanism, the transfer mechanism, the second assembly mechanism, and the second industrial robotic arm. The positioning seats are used to place semi-finished tooling or sealing tooling, and the positioning seats are arranged along both sides of the strip groove.

[0035] Optionally, the first assembly mechanism includes a support arm, a rotary drive mechanism, a third drive mechanism, and a screwing sleeve. The support arm is mounted on the worktable; the rotary drive mechanism is slidably mounted on the support arm; the third drive mechanism is used to drive the rotary drive mechanism to slide vertically on the support arm; and the screwing sleeve is connected to the bottom of the rotary drive mechanism and is used to tighten the clamping sleeve to the outer wall of the base.

[0036] Optionally, the acid injection mechanism includes a first lifting mechanism, a pump body, and an acid injection pipe. The first lifting mechanism is mounted on the worktable; the pump body is mounted on the first lifting mechanism so that the pump body can be lifted and moved, and the pump body is used to deliver the cobalt removal reagent; the acid injection pipe is connected to the pump body and is used to inject the cobalt removal reagent into the inner cavity of the semi-finished product tooling.

[0037] Optionally, a fume hood is provided on the workbench, with through slots on both sides for the passage of semi-finished tooling, an acid injection pipe that moves through the fume hood, and an exhaust pipe at the top of the fume hood.

[0038] Optionally, the sealing mechanism includes a second lifting mechanism, a movable arm, and a pressure rod. The second lifting mechanism is mounted on the worktable. The movable arm is mounted on the second lifting mechanism so that the movable arm can be lifted and moved, and the movable arm moves through the smoke hood. The pressure rod is connected to the bottom of the movable arm and is used to press the sealing cover tightly against the top of the mounting block of the semi-finished tooling.

[0039] This application also provides a polycrystalline diamond composite sheet, which is made based on the above-mentioned sealed cobalt removal device, including a substrate, a composite layer connected to the top of the substrate, the composite layer including an unremoved cobalt layer connected to the top of the substrate, and an annular decobalt layer surrounding the unremoved cobalt layer.

[0040] Optionally, let the edge cobalt removal depth of the annular decobalt removal layer be h1, then the range of h1 is: h / 2≤h1≤9h / 10; where h is the thickness of the composite layer.

[0041] Optionally, let a be the radial distance between the outer edge of the top surface of the annular decobalt layer and the outer edge of the top surface of the undecobalt layer. Then the range of a is: 3000≤a≤5000um.

[0042] Optionally, the annular decobalt layer is divided into edge decobalt region and flat decobalt region according to different depths. The flat decobalt region is close to the undecobalt layer, and the edge decobalt region is located outside the flat decobalt region. The depth of the edge decobalt region is greater than the depth of the flat decobalt region. Let the radial width of the flat decobalt region be a1, then the range of a1 is: 0 < a1 ≤ 2000 μm.

[0043] Optionally, the top surface of the uncobalt-free layer can be either a regular or irregular shape.

[0044] The beneficial effects that this application can achieve are as follows:

[0045] When the workpiece to be decobalt removed is installed and decobalt removal is performed, the decobalt removal reagent in the inner cavity comes into contact with the top surface of the composite layer. At the same time, under high temperature and high pressure conditions, the decobalt removal reagent gradually penetrates the composite layer to carry out the decobalt removal effect. During this process, the first sealing body in the composite sealing ring can block most of the decobalt removal reagent, preventing the decobalt removal reagent from corroding the outer wall of the workpiece to be decobalt removed. When a small amount of acid gas formed under high temperature and high pressure conditions penetrates the first sealing body, the second sealing body can block the acid gas, or react with the acid gas of this part of the decobalt removal reagent, thereby consuming this part of the decobalt removal reagent. This effectively prevents the acid gas of the decobalt removal reagent from penetrating into the alloy part of the workpiece to be decobalt removed (i.e., the base part that does not need to be decobalt removed). Therefore, this application improves the isolation performance of the decobalt removal reagent through the optimized design of the composite sealing ring, thereby playing a good protective role, ensuring the decobalt removal effect and improving the surface quality of the diamond composite sheet. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0047] Figure 1 This is a schematic diagram of the structure of a sealed cobalt removal device according to an embodiment of this application;

[0048] Figure 2 This is a schematic diagram of the assembly structure of the workpiece to be decobalt removed and the composite sealing ring in an embodiment of this application;

[0049] Figure 3 This is a schematic diagram (top view) of the clamping mechanism in an embodiment of this application;

[0050] Figure 4 This is a schematic diagram (top view) of the connection structure between the clamping column and the positioning block in an embodiment of this application;

[0051] Figure 5 This is a schematic diagram of the mating structure between the mounting block and the clamping sleeve in an embodiment of this application;

[0052] Figure 6 This is a three-dimensional structural diagram of the assembly equipment in an embodiment of this application;

[0053] Figure 7 This is a schematic diagram of the assembly equipment from a frontal perspective in an embodiment of this application;

[0054] Figure 8 This is a schematic diagram of the cooperation structure between the first industrial robotic arm and the first assembly mechanism in an embodiment of this application;

[0055] Figure 9 This is a schematic diagram of the connection structure between the first transportation mechanism and the workbench in an embodiment of this application;

[0056] Figure 10 This is a schematic diagram of the connection structure between the first transport mechanism and the workbench in an embodiment of this application from another perspective;

[0057] Figure 11 This is a schematic diagram of the integrated structure of components such as the acid injection mechanism and the capping mechanism in the embodiments of this application;

[0058] Figure 12 This is a schematic diagram of the transfer mechanism in an embodiment of this application;

[0059] Figure 13 This is a schematic diagram of the structure of the polycrystalline diamond composite sheet in the embodiments of this application.

[0060] Figure label:

[0061] 110-Encapsulation mechanism, 111-Base, 112-Clamping sleeve, 1121-Clamping boss, 113-Encapsulation cover, 120-Clamping mechanism, 121-Clamping groove, 122-Step groove, 130-Composite sealing ring, 131-First sealing body, 132-Second sealing body, 140-Containing mechanism, 141-Receiving block, 1411-Limiting step, 142-Sealing cover, 150-Barrier assembly 151-Clamping column, 152-Isolation sleeve, 153-Positioning block, 160-Polycrystalline diamond composite sheet, 161-Substrate, 162-Composite layer, 1621-Uncobalt-removed layer, 1622-Annular cobalt-removed layer, 170-Worktable, 171-Strip groove, 180-First assembly mechanism, 181-Support arm, 182-Rotary drive mechanism, 183-Third drive mechanism, 184-Turning sleeve, 19 0-Acid injection mechanism, 191-First lifting mechanism, 192-Pump body, 193-Acid injection pipe, 210-Sealing mechanism, 211-Second lifting mechanism, 212-Moving arm, 213-Pressure rod, 220-Second assembly mechanism, 230-First industrial robotic arm, 240-Second industrial robotic arm, 250-First transport mechanism, 251-Fixed frame, 252-Moving platform, 253-First drive mechanism, 254-First telescopic mechanism, 255-Lifting platform, 256-First mechanical gripper, 260-Second transport mechanism, 270-Transfer mechanism, 271-Support frame, 272-Second telescopic mechanism, 273-Second mechanical gripper, 274-Second drive mechanism, 280-Positioning seat, 290-Fume hood, 291-Through groove, 310-Exhaust pipe, 320-Semi-finished product tooling, 330-Sealing tooling.

[0062] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0063] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0064] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0065] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0067] Example 1

[0068] Reference Figures 1-5This embodiment provides a sealed cobalt removal device, including a packaging mechanism 110, a clamping mechanism 120, a composite sealing ring 130, and a holding mechanism 140. The clamping mechanism 120 is disposed within the packaging mechanism 110 and is used to clamp the workpiece to be decobalt removed. The workpiece to be decobalt removed includes a substrate 161 and a composite layer 162 connected to the top of the substrate 161. The composite sealing ring 130 is embedded in the top of the clamping mechanism 120 and is sleeved on the workpiece to be decobalt removed. The composite sealing ring 130 includes a first sealing body 131 and a first sealing ring 132 embedded in the first sealing body 140. The second sealing body 132 is located on the inner wall of the body 131 and is sleeved on the outer wall of the composite layer 162 or at the junction of the composite layer 162 and the substrate 161. The first sealing body 131 is used to block the cobalt removal reagent. The material of the second sealing body 132 is a material that can react with or not react with the cobalt removal reagent. The holding mechanism 140 is disposed in the packaging mechanism 110 and the bottom of the holding mechanism 140 is pressed against the top surface of the first sealing body 131. The holding mechanism 140 has an inner cavity for holding the cobalt removal reagent and the inner cavity communicates with the top surface of the composite layer 162.

[0069] In existing technologies, during cobalt removal from composite sheet products, the use of a high-temperature sealed structure allows a small amount of acid gas molecules from the cobalt removal reagent (an acidic chemical reagent) to penetrate the sealed structure due to the high temperature and pressure conditions. This causes slight corrosion on the surface of the cemented carbide composite sheet, requiring grinding to achieve the desired surface finish. Furthermore, the higher the temperature and pressure, the more severe the surface corrosion; conversely, reducing the temperature and pressure leads to a decrease in the cobalt removal efficiency.

[0070] Therefore, in this embodiment, when the workpiece to be decobalt removed is installed and decobalt removal is performed, the decobalt removal reagent in the inner cavity contacts the top surface of the composite layer 162. At the same time, under high temperature and high pressure conditions, the decobalt removal reagent gradually penetrates the composite layer 162 to perform the decobalt removal action. During this process, the first sealing body 131 in the composite sealing ring 130 can block most of the decobalt removal reagent, preventing the decobalt removal reagent from corroding the outer wall of the workpiece to be decobalt removed. When a small amount of acid gas formed under high temperature and high pressure conditions penetrates the first sealing body 131, the second sealing body 132 can block the acid gas (when the material of the second sealing body 132 does not react with the decobalt removal reagent), or the second sealing body 132 can react with the acid gas of this part of the decobalt removal reagent, thereby consuming this part of the decobalt removal reagent. This effectively prevents the acid gas of the decobalt removal reagent from penetrating into the alloy part of the workpiece to be decobalt removed (i.e., the base 161 part that does not need to be decobalt removed). Therefore, this embodiment improves the isolation performance of the decobalt removal reagent through the optimized design of the composite sealing ring 130, thereby playing a good protective role. Furthermore, since this embodiment significantly reduces the corrosive effect of the cobalt removal reagent on the outer wall of the workpiece to be decobalt removed, the temperature can be further increased to above 250°C under the existing cobalt removal process conditions, thereby further improving the cobalt removal effect and increasing the quality of the diamond composite sheet obtained.

[0071] It should be noted that the first sealing body 131 is made of a sealing material, such as plastic, while the second sealing body 132 can be made of a metal material, or any material that can consume the acid gas from the cobalt removal reagent. Since the upper end of the inner wall of the metal material contacts the composite layer 162, it cuts off the first sealing body 131 from the hard alloy at the lower end of the product. Because very little acid gas passes through the intermolecular gaps of the composite sealing ring 130 and directly contacts the second sealing body 132 made of metal, the metal material consumes this portion of the acid gas, thus protecting the hard alloy and preventing corrosion of the product. The composite sealing ring 130 can have a structure where its outer diameter decreases from top to bottom, forming a conical structure. Pressing the composite sealing ring 130 downwards improves the radial clamping reliability.

[0072] In addition, the above-mentioned cobalt removal reagent can be in gaseous or liquid state. If it is in liquid state, the cobalt removal reagent includes 24-48 parts of hydrofluoric acid, 24-30 parts of nitric acid and 32-40 parts of distilled water by mass to meet the cobalt removal process conditions. If it is in gaseous state, the above-mentioned liquid cobalt removal reagent can be evaporated into gas at high temperature.

[0073] The composite sheets prepared using ordinary sealing rings and composite sealing rings under different process conditions were compared, and the comparison results are shown in Table 1 below:

[0074] Table 1. Experimental Comparison Results

[0075]

[0076] As can be seen from Table 1 above, the cobalt removal effect is better (i.e., the edge depth is greater) as the temperature increases. If a traditional sealing ring is used, the higher the temperature, the higher the degree of corrosion of the final composite sheet, which leads to a higher degree of grinding and a smaller diameter of the composite sheet after grinding, affecting the product specifications and quality. However, with the composite sealing ring of this embodiment, there is basically no corrosion, and only surface polishing is required. The degree of grinding is very low, and the diameter of the composite sheet after grinding is relatively large, which improves the product specifications and quality.

[0077] As an optional implementation, the inner wall of the cavity is provided with a corrosion-resistant layer. The material used to form the corrosion-resistant layer includes one or more of the following: fluoroplastics, resins, metals, metal oxides or nitrides, non-metals, and non-metal oxides or nitrides, thereby improving the corrosion resistance of the cavity.

[0078] Due to the sealing structure based on the composite sealing ring 130, a diamond composite sheet with a high cobalt removal depth can be obtained, i.e., better wear resistance, but the toughness of the diamond composite sheet is also reduced. Therefore, as an optional implementation, a barrier component 150 is provided inside the cavity, and the bottom of the barrier component 150 is pressed against a portion of the top surface of the composite layer 162, so that the exposed area of ​​the top surface of the composite layer 162 is the reaction area in contact with the cobalt removal reagent.

[0079] In this embodiment, the barrier component 150 can compress a portion of the top surface of the composite layer 162, thus exposing only the reaction area on the top surface of the composite layer 162. When the decobalt removal reagent is introduced into the inner cavity, the reagent primarily contacts the reaction area. For example, the reaction area is set as a ring-shaped region, ultimately forming a ring-shaped decobalt removal structure. In other embodiments, the reaction area can also be an irregular or regular non-ring-shaped region, thereby forming a decobalt removal layer with a special structure to meet specific application requirements. Since the grinding portion of the diamond composite sheet is mainly the edge region, in this embodiment, the barrier component 150 ultimately forms a decobalt removal layer (i.e., the grinding portion) on the top edge region of the composite layer 162, while the middle part of the composite layer 162 remains undecobalt removed. This increases the toughness of the middle part of the composite layer 162, thereby improving the overall toughness of the diamond composite sheet and extending its service life. Through the synergistic effect of the barrier component 150 and the composite sealing ring 130, a high-quality diamond composite sheet can ultimately be produced.

[0080] As an optional implementation, the barrier assembly 150 includes a clamping post 151 and an isolation sleeve 152. The top of the clamping post 151 abuts against the inner top of the inner cavity; the isolation sleeve 152 is disposed at the bottom of the clamping post 151 and fits against a portion of the top surface of the composite layer 162.

[0081] In this embodiment, the clamping column 151 can generate a clamping force on the top surface of the composite layer 162, while the isolation sleeve 152 transmits the clamping force, so that the isolation sleeve 152 can be tightly pressed on the top surface of the composite layer 162. This allows the isolation sleeve 152 to resist most of the erosion by the decobalt removal reagent. The shielding effect of the isolation sleeve 152 can form a certain range of undecobalt-removed area on the top surface of the composite layer 162, thereby obtaining a diamond composite sheet with an annular decobalt-removed structure.

[0082] It should be noted that the isolation sleeve 152 and the clamping column 151 can be connected by a threaded structure for easy assembly and disassembly. The combination of the isolation sleeve 152 and the clamping column 151 allows for the selection of the corresponding shape of the isolation sleeve 152 and the clamping column 151 for assembly and cooperation according to the required shape of the reaction area. This allows the isolation sleeve 152 of the corresponding shape to cover part of the top surface of the composite layer 162, leaving the required shape of the reaction area, thus improving the utilization rate of the barrier component 150 and making it more flexible in use.

[0083] As an optional implementation, a positioning assembly is provided on the outer wall of the clamping column 151. The positioning assembly includes a plurality of positioning blocks 153 connected to the outer wall of the clamping column 151. The positioning blocks 153 are all fitted to the inner wall of the inner cavity, and adjacent positioning blocks 153 are arranged at intervals.

[0084] In this embodiment, during installation, the clamping column 151 is placed into the inner cavity. At this time, multiple positioning blocks 153 are attached to the inner wall of the inner cavity, so that the isolation sleeve 152 at the bottom of the clamping column 151 can be positioned and attached to the corresponding position on the top surface of the composite layer 162, thereby achieving positioning installation. The adjacent positioning blocks 153 are arranged at intervals to form gaps, which allow the cobalt removal reagent added to the inner cavity to pass smoothly.

[0085] As an optional implementation, the outer wall of the positioning block 153 is provided with an external thread, and the inner wall of the inner cavity is provided with an internal thread that mates with the external thread.

[0086] In this embodiment, since the barrier component 150 needs to be installed first before the cobalt removal reagent is added, the barrier component 150 relies mainly on its own weight to press against the top surface of the composite layer 162 after installation, which has a relatively poor anti-permeation effect on the cobalt removal reagent. Therefore, by forming a threaded connection structure between the positioning block 153 and the inner wall of the cavity, the clamping column 151 is screwed into the inner cavity, thereby making the positioning block 153 threadedly connected to the inner wall of the cavity. By utilizing the self-locking effect of the thread between the positioning block 153 and the inner wall of the cavity, the isolation sleeve 152 can be tightly pressed against the top surface of the composite layer 162, which plays a temporary pressing role and reduces the possibility of the cobalt removal reagent penetrating the gap between the isolation sleeve 152 and the top surface of the composite layer 162, thereby further promoting the formation of the annular cobalt removal structure.

[0087] As an optional implementation, the holding mechanism 140 includes a receiving block 141 and a sealing cover 142. The inner cavity is opened in the receiving block 141, and the bottom of the receiving block 141 is pressed against the top surface of the first sealing body 131. The sealing cover 142 is detachably connected to the top of the receiving block 141.

[0088] In this embodiment, during assembly, the mounting block 141 is first pressed against the top surface of the first sealing body 131, then the barrier component 150 is installed in the inner cavity of the mounting block 141, and then the sealing cap 142 is installed on the top of the mounting block 141. At this time, the sealing cap 142 can exert a pressing force on the barrier component 150, so that the barrier component 150 is firmly pressed against the top surface of the composite layer 162, and finally the inner cavity forms a sealed cavity, which facilitates the subsequent cobalt removal process through high temperature.

[0089] As an optional implementation, the packaging mechanism 110 includes a base 111, a clamping sleeve 112, and a packaging cover 113. The base 111 has a receiving cavity with a top opening, and the clamping mechanism 120 is located at the bottom of the receiving cavity. The clamping sleeve 112 has a hollow structure, and the lower section of the clamping sleeve 112 is threaded onto the outer wall of the base 111, while the upper section of the clamping sleeve 112 is fitted onto the outer wall of the mounting block 141. The packaging cover 113 is threaded onto the outer wall of the clamping sleeve 112, so that the packaging cover 113 is pressed against the top of the sealing cover 142. The outer wall of the mounting block 141 is provided with a limiting step 1411, and the clamping sleeve 112 is provided with a clamping boss 1121 that cooperates with the limiting step 1411.

[0090] In this embodiment, after the assembly of the holding mechanism 140 (with added cobalt removal reagent) is completed, the clamping sleeve 112 is threaded onto the outer wall of the base 111 and tightened, so that the clamping boss 1121 exerts a clamping force on the limiting step 1411, thereby exerting a clamping force on the entire bearing block 141, so that the bearing block 141 can be tightly pressed against the top surface of the first sealing body 131 to ensure the sealing effect. Finally, the sealing cover 113 is threaded onto the outer wall of the clamping sleeve 112 and tightened to press the sealing cover 142, thus obtaining a reliable sealed cobalt removal device.

[0091] As an optional implementation, the clamping mechanism 120 includes at least two detachably connected clamping blocks. The inner wall of the clamping block is provided with a clamping groove 121 for clamping the workpiece to be decobalt removed, and the top of the clamping block is provided with a stepped groove 122 for embedding the composite sealing ring 130.

[0092] In this embodiment, two clamping blocks are generally sufficient. The two clamping blocks can be connected together by bolts to achieve a detachable connection. This ensures a tight fit between the composite sealing ring 130 and the workpiece to be decobaltized, playing a key role in protecting the hard alloy of the workpiece. The clamping force is also adjustable (i.e., the radial pressure is adjustable). Different radial pressures can meet different decobalt removal processes, which can significantly increase the pressure in the inner cavity during the decobalt removal process without causing corrosion of the alloy part of the workpiece to be decobaltized.

[0093] It should be noted that the workpiece to be decobalt removed is generally cylindrical, so the clamping block can be an arc-shaped block. In some special cases, the workpiece to be decobalt removed can also have a cross-section of a fan shape, a polygon, or other irregular shape. In this case, the composite sealing ring 130 can be matched according to the corresponding shape of the workpiece to be decobalt removed. The clamping block is also designed with a clamping groove 121 of the corresponding shape. The structure of other components does not need to be changed. Only the composite sealing ring 130 and the clamping mechanism 120 of the corresponding shape need to be matched according to the shape of the workpiece to be decobalt removed, which has a certain degree of versatility.

[0094] As an optional implementation, the top surface of the workpiece to be decobaltized protrudes relative to the top surface of the first sealing body 131, and the height of the protrusion is H, where H = 600-800 μm. After the workpiece to be decobaltized is sealed and installed, the height of the protrusion is the part to be decobaltized, and the boundary surface inclination angle α is related to the protrusion height H. Under this protrusion height H, the requirement that the boundary surface inclination angle α between the decobalt-removed layer and the undecobalt-removed layer of the workpiece can be met is α < 45°.

[0095] Example 2

[0096] Reference Figures 1-5 This embodiment provides a cobalt removal method based on the aforementioned sealed cobalt removal device, comprising the following steps:

[0097] The workpiece to be decobalt removed is clamped in the sealed decobalt removal device through the clamping mechanism 120, and the sealed decobalt removal device is then encapsulated.

[0098] The sealed cobalt removal device after encapsulation is heated to a temperature of 50–350°C.

[0099] Remove the heated, sealed cobalt removal device and cool it to room temperature;

[0100] Remove the encapsulation cap 113 and the sealing cap 142 to pour out the cobalt removal reagent inside the cavity;

[0101] Continue disassembling the clamping sleeve 112, the mounting block 141, the barrier assembly 150, and the clamping mechanism 120 to remove the cobalt-free workpiece.

[0102] In this embodiment, during cobalt removal, the workpiece to be removed is first clamped in the sealed cobalt removal device using the clamping mechanism 120 to complete the encapsulation process. Then, the entire sealed cobalt removal device is heated to increase the pressure inside the cavity, promoting the penetration of the cobalt removal reagent into the top of the workpiece, thereby achieving the cobalt removal process. Then, the sealed cobalt removal device is cooled to room temperature, and the encapsulation cover 113 and the sealing cover 142 are disassembled in sequence. After the cobalt removal reagent is poured out, the clamping sleeve 112, the receiving block 141, the barrier component 150, and the clamping mechanism 120 are removed. Finally, the cobalt-removed workpiece can be taken out.

[0103] It should be noted that the heating method described above can be at least one of water bath, oil bath, gas bath, microwave heating, resistance wire heating, oven heating, electromagnetic induction heating, or infrared heating. After pouring out the cobalt removal reagent from the inner cavity, the residual cobalt removal reagent in the inner cavity needs to be repeatedly rinsed with clean water. Timely cleaning of the inner cavity can reduce the corrosive effect of the cobalt removal reagent and prepare it for future use. Before removing the cobalt-removed workpiece, it is also necessary to perform ultrasonic cleaning on the cobalt-removed workpiece, and then dry the cleaned workpiece. Ultrasonic cleaning can wash out the cobalt removal reagent in the gaps of the sealed cobalt removal device, preventing the cobalt removal reagent from contacting and corroding the metal alloy matrix 161 of the workpiece when it is removed. Drying the workpiece can completely evaporate the residual cobalt removal reagent.

[0104] As an optional implementation, the workpiece to be decobalt removed is clamped in the sealed decobalt removal device via the clamping mechanism 120, and the sealed decobalt removal device is then encapsulated, including:

[0105] The workpiece to be decobalt removed is pre-clamped by the clamping mechanism 120, and a composite sealing ring 130 is installed on the top of the clamping mechanism 120 so that the composite sealing ring 130 is sleeved on the workpiece to be decobalt removed.

[0106] The clamping mechanism 120, which holds the workpiece to be decobalt removed, is placed entirely at the bottom of the receiving cavity of the base 111;

[0107] Install the mounting block 141 so that the bottom of the mounting block 141 is pressed against the top surface of the first sealing body 131;

[0108] Install the clamping sleeve 112 so that the clamping sleeve 112 clamps the mounting block 141;

[0109] A barrier assembly 150 is installed inside the cavity of the mounting block 141 so that the bottom of the barrier assembly 150 is pressed against a portion of the top surface of the composite layer 162.

[0110] Add an appropriate amount of cobalt removal reagent into the inner cavity;

[0111] A sealing cap 142 is installed on the top of the receiving block 141 to form a sealed cavity inside the cavity;

[0112] Install the encapsulation cover 113 to press the sealing cover 142, thus completing the encapsulation of the sealed cobalt removal device.

[0113] In this embodiment, when encapsulating the workpiece to be decobalt removed, the workpiece is first pre-clamped by the clamping mechanism 120, and a composite sealing ring 130 is installed on the top of the clamping mechanism 120. Then, the clamping mechanism 120 with the workpiece to be decobalt removed is placed at the bottom of the receiving cavity of the base 111. Then, the mounting block 141, the clamping sleeve 112, and the blocking component 150 are installed in sequence. The blocking component 150 blocks part of the top surface of the workpiece to be decobalt removed. When an appropriate amount of decobalt removal reagent is added later, the decobalt removal reagent only contacts the annular area exposed on the top surface of the workpiece to be decobalt removed. Then, the sealing cap 142 and the encapsulation cap 113 are installed in sequence to complete the encapsulation of the sealed decobalt removal device. Finally, a composite sheet with an annular decobalt removal structure can be obtained.

[0114] As an optional implementation, in the step of adding an appropriate amount of cobalt removal reagent to the inner cavity, the amount of cobalt removal reagent added is 1 / 5 to 4 / 5 of the inner cavity volume. Since the cobalt removal reagent contains volatile chemical components and water, the vaporization of the liquid during heating will cause a sharp increase in the internal pressure of the inner cavity. When the amount of chemical reagent exceeds 4 / 5 of the inner cavity volume, the remaining 1 / 5 of the space is insufficient to accommodate the vaporized chemical reagent, and the internal pressure will exceed the pressure that the device can withstand, causing the cobalt removal reagent to overflow or the sealed cobalt removal device to rupture. When the amount of cobalt removal reagent is less than 1 / 5 of the inner cavity volume, the amount of cobalt removal reagent is insufficient to achieve the target cobalt removal depth. Therefore, adding 1 / 5 to 4 / 5 of the inner cavity volume of cobalt removal reagent is more reasonable.

[0115] Example 3

[0116] Reference Figures 1-12This embodiment provides an assembly device for assembling the aforementioned sealing cobalt removal device, including a workbench 170. The workbench 170 is equipped with a first assembly mechanism 180, an acid injection mechanism 190, a capping mechanism 210, and a second assembly mechanism 220. A first industrial robotic arm 230 and a second industrial robotic arm 240 are respectively arranged on both sides of the workbench 170. The first industrial robotic arm 230 is used to clamp a clamping sleeve 112 and pre-install the clamping sleeve 112 onto a pre-assembly fixture to obtain a semi-finished fixture 320. The pre-assembly fixture is located on the workbench 170 and consists of a clamping mechanism 120 and a composite sealing ring 130 pre-installed within a base 111. The tooling consists of a workpiece to be decobalt removed and a mounting block 141; a first assembly mechanism 180 is used to tighten the clamping sleeve 112 onto the outer wall of the base 111; an acid injection mechanism 190 is used to inject decobalt removal reagent into the inner cavity of the semi-finished tooling 320; a sealing mechanism 210 is used to press the sealing cap 142 onto the top of the mounting block 141 of the semi-finished tooling 320 after the decobalt removal reagent has been injected, so as to obtain a sealing tooling 330; a second industrial robotic arm 240 is used to clamp the encapsulation cap 113 and pre-install the encapsulation cap 113 onto the clamping sleeve 112 of the sealing tooling 330; and a second assembly mechanism 220 is used to tighten the encapsulation cap 113 onto the outer wall of the clamping sleeve 112, finally obtaining a sealed decobalt removal device.

[0117] Because the sealed cobalt removal device has a relatively complex structure, and each device can only remove cobalt from one workpiece, manual assembly is insufficient to meet the cobalt removal requirements of a large number of workpieces. Furthermore, some core components require tight installation to ensure sealing, which is difficult to guarantee manually. Therefore, based on the assembly equipment of this embodiment, during assembly, some parts of the sealed cobalt removal device are pre-assembled to obtain a pre-assembly fixture (which can be assembled manually or by automated equipment). The pre-assembly fixture is then placed at the corresponding station on the workbench 170. The first industrial robotic arm 230 clamps the clamping sleeve 112 and pre-installs it onto the pre-assembly fixture, resulting in a semi-finished fixture 320. The first assembly mechanism 180 then tightens the clamping sleeve 112 onto the outer wall of the base 111, thereby applying pressure to the bearing block 141, causing the bearing block 141 to press against the top surface of the composite sealing ring 130, forming a tight structure in the semi-finished fixture 320. Finally, acid injection is performed... Mechanism 190 injects cobalt removal reagent into the inner cavity of semi-finished tooling 320, and sealing cap 142 is pressed against the top of bearing block 141 by sealing capping mechanism 210 to obtain sealing tooling 330. Then, the second industrial robotic arm 240 clamps the encapsulation cap 113 and pre-installs the encapsulation cap 113 on the clamping sleeve 112 of sealing tooling 330. Finally, the second assembly mechanism 220 screws the encapsulation cap 113 onto the outer wall of clamping sleeve 112, and finally obtains a sealed cobalt removal device that meets the sealing requirements. The assembly equipment in this embodiment can automatically assemble the core components of the sealed cobalt removal device, using mechanical force instead of human force, which can ensure that the clamping of the workpiece to be decobalt removed is reliable and the sealing is reliable, thereby ensuring the quality of cobalt removal.

[0118] It should be noted that the first industrial robotic arm 230 and the second industrial robotic arm 240 can be existing multi-degree-of-freedom robotic arms, which can have clamping and multi-directional rotation functions to meet the usage requirements; the second industrial robotic arm 240 can also be used to clamp and transfer the assembled sealed cobalt removal device into a centrally stacked box, further reducing manual labor.

[0119] As an optional implementation, it also includes a first transport mechanism 250, a second transport mechanism 260, and a transfer mechanism 270. The first transport mechanism 250 is used to move the semi-finished tooling 320 sequentially along the workstations corresponding to the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, and the capping mechanism 210. The second transport mechanism 260 is used to move the sealing tooling 330 to the workstation corresponding to the second assembly mechanism 220. The transfer mechanism 270 is used to transfer the sealing tooling 330 from the first transport mechanism 250 to the second transport mechanism 260.

[0120] In this embodiment, since the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, the capping mechanism 210, the second assembly mechanism 220, and the second industrial robotic arm 240 are generally distributed in a linear production line, after each station completes its corresponding assembly work, the corresponding tooling needs to be moved to the next station. However, due to the inconsistency in the assembly process and efficiency of the tooling, according to the characteristics of the production line, the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, and the capping mechanism 210 can be combined to form one production line, and the second assembly mechanism 220 and the second industrial robotic arm 240 can form another production line. At the same time, two independent mechanisms, the first transport mechanism 250 and the second transport mechanism 260, are set up to move and transport the corresponding tooling to different production lines respectively. Meanwhile, the sealing tooling 330 on the production line corresponding to the first transport mechanism 250 is transferred to the production line corresponding to the second transport mechanism 260 through the transfer mechanism 270, so that they can be transported independently to ensure the work efficiency of each process.

[0121] As an optional implementation, the first transport mechanism 250 includes a fixed frame 251, a movable platform 252, a first drive mechanism 253, a first telescopic mechanism 254, a lifting platform 255, and at least one first mechanical gripper 256. The fixed frame 251 is disposed at the bottom of the workbench 170; the movable platform 252 is slidably disposed on the fixed frame 251; the first drive mechanism 253 is disposed on the fixed frame 251 and is used to drive the movable platform 252 to slide laterally on the fixed frame 251; the first telescopic mechanism 254 is disposed at the bottom of the movable platform 252, and the first telescopic mechanism 256 is used to drive the movable platform 252 to slide laterally on the fixed frame 251. The telescopic end of mechanism 254 extends through the moving platform 252; the lifting platform 255 is located on the top of the first telescopic mechanism 254; the first mechanical gripper 256 is located on the top of the lifting platform 255, and the first mechanical gripper 256 is used to hold pre-assembled tooling and / or semi-finished tooling 320. The worktable 170 is provided with a strip groove 171 for the first mechanical gripper 256 to pass through. The strip groove 171 is parallel to the sliding direction of the moving platform 252, and the strip groove 171 covers the work positions corresponding to the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, and the capping mechanism 210.

[0122] In this embodiment, during operation, the first telescopic mechanism 254 drives the lifting platform 255 and the first mechanical gripper 256 to move upward simultaneously, so that the first mechanical gripper 256 extends into the slot 171 of the worktable 170, and then the first mechanical gripper 256 clamps the corresponding pre-assembled tooling and / or semi-finished tooling 320. The first telescopic mechanism 254 continues to drive the lifting platform 255 to move upward, so that the pre-assembled tooling and / or semi-finished tooling 320 is disengaged from the worktable 170 by a certain distance. Then, the first drive mechanism 253 drives the moving platform 252 to slide laterally on the fixed frame 251, so that the first telescopic mechanism 254 on the moving platform 252 moves laterally synchronously. This causes the lifting platform 255, the first mechanical gripper 256, and the pre-installed tooling and / or semi-finished tooling 320 to move synchronously a corresponding distance along the direction of the strip groove 171. After the semi-finished tooling 320 moves to the corresponding work position, the first telescopic mechanism 254 drives the first mechanical gripper 256 to move down and release, so as to position the semi-finished tooling 320 in the corresponding work position of the worktable 170. The first telescopic mechanism 254 drives the first mechanical gripper 256 to continue to move down and exit the strip groove 171. Then, the first drive mechanism 253 drives the moving platform 252 to reverse and horizontally reset, so as to prepare for the next transportation of the pre-installed tooling and / or semi-finished tooling 320.

[0123] It should be noted that the first drive mechanism 253 can adopt a transmission structure of a motor and lead screw assembly, or a transmission structure of a telescopic hydraulic cylinder, which can realize the lateral reciprocating sliding of the moving table 252 on the fixed frame 251. A guide sliding assembly can be set between the moving table 252 and the fixed frame 251 for guiding the sliding. The first telescopic mechanism 254 can adopt a telescopic hydraulic cylinder or electric push rod, etc., to realize automatic extension and retraction. The first mechanical gripper 256 can adopt an existing electric gripper with automatic gripping function. Multiple sets of first mechanical grippers 256 can be set, and each first mechanical gripper 256 can be controlled independently, so that tooling at different workstations can be gripped simultaneously and individually for transfer work, with flexible operation. The second transport mechanism 260 can have the same structure as the first transport mechanism 250, thereby realizing automatic transfer and transportation.

[0124] As an optional implementation, the transfer mechanism 270 includes a support frame 271, a second telescopic mechanism 272, a second mechanical gripper 273, and a second drive mechanism 274. The support frame 271 is disposed on the worktable 170 and is located between the first transport mechanism 250 and the second transport mechanism 260. The second telescopic mechanism 272 (which can be slidably disposed on the support frame 271 via a guide assembly) is disposed on the support frame 271. The second mechanical gripper 273 is disposed at the bottom of the second telescopic mechanism 272 and is used to clamp the sealing fixture 330. The second drive mechanism 274 is disposed on the support frame 271 and is used to drive the second telescopic mechanism 272 to slide laterally on the support frame 271.

[0125] In this embodiment, when transfer is required, the second mechanical gripper 273 is first moved downward by the second telescopic mechanism 272, and then the assembled sealing fixture 330 is clamped by the second mechanical gripper 273. The second telescopic mechanism 272 moves the second mechanical gripper 273 and the sealing fixture 330 upward to a certain height. The second drive mechanism 274 then moves the second telescopic mechanism 272, the second mechanical gripper 273 below it, and the sealing fixture 330 as a whole to slide laterally towards the second transport mechanism 260. Finally, the second mechanical gripper 273 is moved downward by the second telescopic mechanism 272 and the sealing fixture 330 is released, thereby realizing the automatic transfer of the sealing fixture 330.

[0126] It should be noted that the second telescopic mechanism 272 can also be an automatic device such as a telescopic hydraulic cylinder or an electric push rod; the second mechanical gripper 273 can also be an electric gripper; the second drive mechanism 274 can be a transmission structure of a motor and a lead screw assembly, or a transmission structure of a telescopic hydraulic cylinder, which can realize the second telescopic mechanism 272 sliding laterally back and forth on the support frame 271.

[0127] As an optional implementation, at least one set of positioning seats 280 is provided on the workbench 170 for each workstation corresponding to the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, the capping mechanism 210, the transfer mechanism 270, the second assembly mechanism 220, and the second industrial robotic arm 240. The positioning seats 280 are used to place the semi-finished product tooling 320 or the sealing tooling 330, and the positioning seats 280 are arranged along both sides of the strip groove 171.

[0128] In this embodiment, when the tooling (including pre-assembled tooling, semi-finished tooling 320, and sealing tooling 330) moves to different workstations, the tooling can be positioned on the positioning seat 280 of the corresponding workstation. The positioning seat 280 can have a positioning groove to cooperate with the base 111 on which the tooling is placed, facilitating precise engagement of the tooling with the corresponding mechanism after movement. Here, the positioning groove adopts a rectangular groove structure, and the side wall of the base 111 also has a limiting groove that mates with the rectangular groove, thereby limiting the tooling within the rectangular groove of the positioning seat 280 and preventing tooling deflection during subsequent assembly.

[0129] As an optional implementation, the first assembly mechanism 180 includes a support arm 181, a rotary drive mechanism 182, a third drive mechanism 183, and a screwing sleeve 184. The support arm 181 is disposed on the worktable 170; the rotary drive mechanism 182 is slidably disposed on the support arm 181; the third drive mechanism 183 is used to drive the rotary drive mechanism 182 to slide vertically on the support arm 181; the screwing sleeve 184 is connected to the bottom of the rotary drive mechanism 182 and is used to screw the clamping sleeve 112 to the outer wall of the base 111.

[0130] In this embodiment, during assembly, the third drive mechanism 183 drives the rotary drive mechanism 182 to slide vertically on the support arm 181, thereby causing the screwing sleeve 184 to be fitted onto the outer wall of the clamping sleeve 112. Here, the outer wall of the clamping sleeve 112 can be a rectangular structure, and the inner hole of the screwing sleeve 184 is a rectangular hole that matches it. When the rotary drive mechanism 182 drives the screwing sleeve 184 to rotate, the base 111 of the tooling cannot rotate under the limiting action of the rectangular groove of the positioning seat 280, so that the screwing sleeve 184 can rotate independently. At the same time, the screwing sleeve 184 also slowly moves down under the action of the third drive mechanism 183, thereby realizing the function of automatically screwing the clamping sleeve 112 onto the outer wall of the base 111.

[0131] It should be noted that the rotary drive mechanism 182 can use a combination of components such as a motor and a reducer to drive the rotation of the screwing sleeve 184, or it can use a rotary cylinder for driving. Similarly, the third drive mechanism 183 can use a transmission structure of a motor and a lead screw assembly, or a transmission structure of a telescopic cylinder. The screwing sleeve 184 and the rotary drive mechanism 182 can be detachably connected (e.g., bolted connection), so that different specifications of the screwing sleeve 184 can be replaced to cooperate with different specifications of the clamping sleeve 112. The second assembly mechanism 220 can adopt the same structure as the first assembly mechanism 180, only requiring the screwing sleeve 184 to be replaced with a specification that can cooperate with the encapsulation cover 113.

[0132] As an optional implementation, the acid injection mechanism 190 includes a first lifting mechanism 191, a pump body 192, and an acid injection pipe 193. The first lifting mechanism 191 is disposed on the worktable 170; the pump body 192 is disposed on the first lifting mechanism 191 so that the pump body 192 can be lifted and moved, and the pump body 192 is used to deliver the cobalt removal reagent; the acid injection pipe 193 is connected to the pump body 192, and the acid injection pipe 193 is used to inject the cobalt removal reagent into the inner cavity of the semi-finished product tooling 320.

[0133] In this embodiment, when cobalt removal reagent needs to be added (i.e., acid injection), the first lifting mechanism 191 drives the pump body 192 and the acid injection pipe 193 to move downwards. The pump body 192 is connected to an acid delivery pipe (not shown in the figure), and the acid injection pipe 193 extends into the inner cavity. Then, starting the pump body 192 injects the cobalt removal reagent into the inner cavity through the acid injection pipe 193, achieving automatic acid injection. It should be noted that the first lifting mechanism 191 is generally a lifting hydraulic cylinder.

[0134] As an optional implementation, a fume hood 290 is provided on the workbench 170. The fume hood 290 has through slots 291 on both sides for the semi-finished product tooling 320 to pass through. The acid injection pipe 193 movably passes through the fume hood 290. A fume exhaust pipe 310 is provided on the top of the fume hood 290.

[0135] In this embodiment, acid vapor is generated during the process of adding the cobalt removal reagent. The fume hood 290 can prevent the corrosive gas of the acid vapor from spreading, while the acid vapor can be discharged and centrally treated through the exhaust pipe 310. Here, a negative pressure device (such as a fan or pump) can be added to quickly extract the acid vapor in the fume hood 290 through the exhaust pipe 310.

[0136] As an optional implementation, the sealing mechanism 210 includes a second lifting mechanism 211, a movable arm 212, and a pressure rod 213. The second lifting mechanism 211 is disposed on the worktable 170. The movable arm 212 is disposed on the second lifting mechanism 211 so that the movable arm 212 can be lifted and moved, and the movable arm 212 moves through the smoke hood 290. The pressure rod 213 is connected to the bottom of the movable arm 212 and is used to press the sealing cap 142 against the top of the receiving block 141 of the semi-finished product tooling 320.

[0137] In this embodiment, since the sealing cap 142 and the top opening of the mounting block 141 are generally interference fit, it is difficult to tighten manually. Therefore, when sealing, the sealing cap 142 is first pre-installed on the top of the mounting block 141 (this can be done manually or automatically by automated equipment). Then, the second lifting mechanism 211 drives the movable arm 212 and its bottom pressure rod 213 to move downward, thereby using mechanical force to press the sealing cap 142 onto the top of the mounting block 141 of the semi-finished tooling 320 through the pressure rod 213, ultimately forming a sealed cavity inside the mounting block 141. Similarly, the second lifting mechanism 211 here is generally a lifting cylinder.

[0138] Example 4

[0139] Reference Figure 13 This embodiment provides a polycrystalline diamond composite sheet 160, which is made based on the above-mentioned sealing cobalt removal device. It includes a substrate 161, a composite layer 162 connected to the top of the substrate 161, the composite layer 162 including an uncobalt removed layer 1621 connected to the top of the substrate 161, and an annular cobalt removed layer 1622 sleeved around the uncobalt removed layer 1621.

[0140] In this embodiment, based on the annular decobalt removal structure of the polycrystalline diamond composite sheet 160, since the grinding part of the polycrystalline diamond composite sheet 160 is mainly the edge area, an annular decobalt removal layer 1622 (i.e. the grinding part) is formed on the top of the composite layer 162, while the middle part of the composite layer 162 is the undecobalt removal layer 1621, thereby increasing the toughness of the middle part of the composite layer 162. This improves the overall toughness of the polycrystalline diamond composite sheet 160 and extends its service life.

[0141] It should be noted that the cross-sections of the substrate 161 and the composite layer 162 can be any of the following: circular, sector-shaped, regular polygonal, and irregular polygonal. For example, both the substrate 161 and the composite layer 162 can adopt a structure with a sector-shaped or other similar cross-sections. Alternatively, the substrate 161 can adopt a circular cross-section, and the composite layer 162 can adopt a sector-shaped cross-section, thus forming polycrystalline diamond composite sheets 160 with various irregular structures to meet the needs of special applications.

[0142] As an optional implementation, let the edge cobalt removal depth of the annular cobalt removal layer 1622 be h1, then the range of h1 is: h / 2≤h1≤9h / 10; where h is the thickness of the composite layer 162. This meets the requirements for ultra-deep removal and is suitable for applications with ultra-long service life.

[0143] As an optional implementation, let a be the radial distance between the outer edge of the top surface of the annular decobalt layer 1622 and the outer edge of the top surface of the undecobalt layer 1621. Then the range of a is: 3000≤a≤5000um, which satisfies the effective use of the grinding part.

[0144] As an optional implementation, the annular decobalt layer 1622 is divided into an edge decobalt region and a flat decobalt region according to different depths. The flat decobalt region is close to the undecobalt layer 1621, and the edge decobalt region is located outside the flat decobalt region. The depth of the edge decobalt region is greater than the depth of the flat decobalt region. Let the radial width of the flat decobalt region be a1, then the range of a1 is: 0 < a1 ≤ 2000 μm.

[0145] As an optional implementation, the top surface of the uncobalt-removed layer 1621 can be a regular shape or an irregular shape. The regular shape is such as a circle, ellipse, fan shape, petal shape or regular polygon. If it is an irregular shape, it means that the distance between the outer edge of the top surface of the uncobalt-removed layer 1621 and the outer wall of the adjacent annular cobalt-removed layer 1622 can be unequal, so as to meet the requirements of various working conditions.

[0146] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A sealed cobalt removal device, characterized in that, include: Packaging mechanism; A clamping mechanism is disposed within the packaging mechanism and is used to clamp the workpiece to be decobalt removed; wherein the workpiece to be decobalt removed includes a substrate and a composite layer connected to the top of the substrate; A composite sealing ring is embedded in the top of the clamping mechanism and sleeved on the workpiece to be decobalt removed. The composite sealing ring includes a first sealing body and a second sealing body embedded in the inner wall of the first sealing body. The second sealing body is sleeved on the outer wall of the composite layer or at the junction of the composite layer and the substrate. The first sealing body is used to block the decobalt removal reagent, and the material of the second sealing body is a material that can react with the decobalt removal reagent. A container is disposed within the encapsulation mechanism, and the bottom of the container is pressed against the top surface of the first sealing body. The container has an inner cavity for holding the cobalt removal reagent, and the inner cavity communicates with the top surface of the composite layer.

2. The sealed cobalt removal device as described in claim 1, characterized in that, The inner cavity is provided with a barrier component, the bottom of which is pressed against a portion of the top surface of the composite layer so that the exposed area of ​​the top surface of the composite layer is the reaction area in contact with the cobalt removal reagent.

3. The sealed cobalt removal device as described in claim 2, characterized in that, The barrier component includes: A clamping column, the top of which abuts against the inner top of the inner cavity; An isolation sleeve is disposed at the bottom of the clamping column and is attached to a portion of the top surface of the composite layer.

4. The sealed cobalt removal device as described in claim 3, characterized in that, The outer wall of the clamping column is fitted with a positioning component, which includes a plurality of positioning blocks connected to the outer wall of the clamping column. The positioning blocks are all fitted to the inner wall of the inner cavity, and adjacent positioning blocks are arranged at intervals.

5. The sealed cobalt removal device as described in claim 4, characterized in that, The outer wall of the positioning block is provided with an external thread, and the inner wall of the inner cavity is provided with an internal thread that mates with the external thread.

6. A sealed cobalt removal device as described in claim 4 or 5, characterized in that, The container mechanism includes: A receiving block, wherein the inner cavity is formed within the receiving block, and the bottom of the receiving block is pressed against the top surface of the first sealing body; A sealing cap, which is detachably attached to the top of the mounting block.

7. The sealed cobalt removal device as described in claim 6, characterized in that, The packaging mechanism includes: A base having a receiving cavity with a top opening inside, and the clamping mechanism located at the bottom of the receiving cavity; A clamping sleeve, wherein the clamping sleeve has a hollow structure, and the lower section of the clamping sleeve is threaded onto the outer wall of the base, and the upper section of the clamping sleeve is fitted onto the outer wall of the bearing block; A sealing cap is threaded onto the outer wall of the compression sleeve so that the sealing cap is pressed against the top of the sealing cap.

8. The sealed cobalt removal device as described in claim 7, characterized in that, The outer wall of the mounting block is provided with a limiting step, and the clamping sleeve is provided with a clamping boss that cooperates with the limiting step.

9. A sealed cobalt removal device as described in any one of claims 1-5, characterized in that, The clamping mechanism includes at least two detachably connected clamping blocks. The inner wall of the clamping block is provided with a clamping groove for clamping the workpiece to be decobalt removed, and the top of the clamping block is provided with a stepped groove for embedding the composite sealing ring.

10. The sealed cobalt removal device as described in claim 1, characterized in that, The top surface of the workpiece to be decobaltized protrudes from the top surface of the first sealing body, and the height of the protrusion is H, where H = 600-800 μm.

11. A method for removing cobalt, characterized in that, Based on the sealed cobalt removal device as described in claim 7, the method includes the following steps: The workpiece to be decobalt removed is clamped in the sealed decobalt removal device by the clamping mechanism, and the sealed decobalt removal device is then encapsulated. The sealed cobalt removal device after encapsulation is heated to a temperature of 50~350℃; Remove the heated sealed cobalt removal device and cool it to room temperature; Remove the encapsulation cap and the sealing cap to pour out the cobalt removal reagent inside the cavity; Continue disassembling the clamping sleeve, the mounting block, the barrier assembly, and the clamping mechanism to remove the cobalt-free workpiece.

12. The cobalt removal method as described in claim 11, characterized in that, The step of clamping the workpiece to be decobalt removed into the sealed decobalt removal device using the clamping mechanism, and then encapsulating the sealed decobalt removal device, includes: The workpiece to be decobalt removed is pre-clamped by the clamping mechanism, and a composite sealing ring is installed on the top of the clamping mechanism so that the composite sealing ring is fitted onto the workpiece to be decobalt removed. The clamping mechanism, which holds the workpiece to be decobalt removed, is placed entirely at the bottom of the receiving cavity of the base; Install the mounting block so that the bottom of the mounting block is pressed against the top surface of the first sealing body; Install the clamping sleeve so that it clamps the mounting block; A barrier component is installed inside the cavity of the mounting block so that the bottom of the barrier component is pressed against a portion of the top surface of the composite layer. Add an appropriate amount of cobalt removal reagent into the inner cavity; The sealing cap is installed on top of the receiving block to form a sealed cavity in the inner cavity; Install the encapsulation cover to press the sealing cover tightly, thus completing the encapsulation of the sealed cobalt removal device.

13. An assembly device for assembling a sealed cobalt removal apparatus as described in claim 7, characterized in that, The assembly equipment includes a workbench, on which a first assembly mechanism, an acid injection mechanism, a capping mechanism, and a second assembly mechanism are arranged. A first industrial robotic arm and a second industrial robotic arm are respectively arranged on both sides of the workbench. The first industrial robotic arm is used to clamp the clamping sleeve and pre-install the clamping sleeve on the pre-installation fixture to obtain a semi-finished fixture; wherein, the pre-installation fixture is located on the worktable, and the pre-installation fixture is a fixture formed by pre-installing the clamping mechanism, the composite sealing ring, the workpiece to be decobalt removed and the support block in the base; The first assembly mechanism is used to screw the clamping sleeve onto the outer wall of the base; The acid injection mechanism is used to inject a cobalt removal reagent into the inner cavity of the semi-finished tooling; The sealing mechanism is used to press the sealing cap tightly against the top of the receiving block of the semi-finished tooling after the cobalt removal reagent is injected, so as to obtain the sealing tooling; The second industrial robotic arm is used to clamp the packaging cover and pre-install the packaging cover onto the clamping sleeve of the sealing fixture; The second assembly mechanism is used to screw the encapsulation cover onto the outer wall of the compression sleeve, ultimately producing a sealed cobalt removal device.

14. The application as described in claim 13, characterized in that, The assembly equipment also includes: The first transport mechanism is used to move the semi-finished tooling sequentially along the workstations corresponding to the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism, and the capping mechanism. The second transport mechanism is used to move the sealing fixture to the workstation corresponding to the second assembly mechanism. A transfer mechanism for transferring the sealing fixture from the first transport mechanism to the second transport mechanism.

15. The application as described in claim 14, characterized in that, The first transportation agency includes: A fixing frame is disposed at the bottom of the worktable; A mobile platform, which is slidably mounted on the fixed frame; A first driving mechanism is disposed on the fixed frame, and the first driving mechanism is used to drive the moving platform to slide laterally on the fixed frame; A first telescopic mechanism is disposed at the bottom of the mobile platform, and the telescopic end of the first telescopic mechanism extends through the mobile platform. A lifting platform is disposed on top of the first telescopic mechanism; At least one first mechanical gripper is disposed on the top of the lifting platform. The first mechanical gripper is used to grip the pre-assembled tooling and / or the semi-finished tooling. A strip groove is provided on the worktable for the first mechanical gripper to pass through. The strip groove is parallel to the sliding direction of the moving platform and covers the workstations corresponding to the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism and the capping mechanism.

16. The application as described in claim 14, characterized in that, The transfer mechanism includes: A support frame is disposed on the workbench and is located between the first transport mechanism and the second transport mechanism; The second telescopic mechanism is slidably mounted on the support frame; The second mechanical gripper is disposed at the bottom of the second telescopic mechanism and is used to hold the sealing fixture. The second drive mechanism is disposed on the support frame and is used to drive the second telescopic mechanism to slide laterally on the support frame.

17. The application as described in claim 15, characterized in that, At least one set of positioning seats is provided on the workbench corresponding to the workstations of the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism, the capping mechanism, the transfer mechanism, the second assembly mechanism, and the second industrial robotic arm. The positioning seats are used to place the semi-finished product tooling or the sealing tooling, and the positioning seats are arranged along both sides of the strip groove.

18. The application as described in claim 13, characterized in that, The first assembly mechanism includes: A support arm is mounted on the worktable; A rotary drive mechanism, which is slidably mounted on the support arm; The third driving mechanism is used to drive the rotary driving mechanism to slide vertically on the support arm; A screwing sleeve is connected to the bottom of the rotary drive mechanism and is used to screw the clamping sleeve to the outer wall of the base.

19. The application as described in claim 13, characterized in that, The acid injection mechanism includes: A first lifting mechanism is disposed on the worktable; A pump body is mounted on the first lifting mechanism to allow the pump body to move vertically and vertically, and the pump body is used to deliver the cobalt removal reagent. The acid injection tube is connected to the pump body and is used to inject a cobalt removal reagent into the inner cavity of the semi-finished tooling.

20. The application as described in claim 19, characterized in that, The workbench is equipped with a smoke hood, and the smoke hood has through slots on both sides for the semi-finished product tooling to pass through. The acid injection pipe moves through the smoke hood, and the top of the smoke hood is equipped with a smoke exhaust pipe.

21. The application as described in claim 20, characterized in that, The sealing mechanism includes: A second lifting mechanism is provided on the worktable; A movable arm is mounted on the second lifting mechanism so that the movable arm can be raised and lowered, and the movable arm can move through the smoke hood. A pressure rod is connected to the bottom of the movable arm and is used to press the sealing cover tightly against the top of the mounting block of the semi-finished tooling.

22. A polycrystalline diamond composite sheet, characterized in that, The device is based on a sealed cobalt removal apparatus as described in any one of claims 1-10, comprising a substrate, a composite layer connected to the top of the substrate, the composite layer comprising an unremoved cobalt layer connected to the top of the substrate, and an annular cobalt removal layer surrounding the unremoved cobalt layer.

23. A polycrystalline diamond composite sheet as described in claim 22, characterized in that, Let the edge cobalt removal depth of the annular decobalt removal layer be h1, then the range of h1 is: h / 2≤h1≤9h / 10; where h is the thickness of the composite layer.

24. A polycrystalline diamond composite sheet as described in claim 22, characterized in that, Let a be the radial distance between the outer edge of the top surface of the annular decobalt-removed layer and the outer edge of the top surface of the non-decobalt-removed layer. Then the range of a is: 3000≤a≤5000um.

25. A polycrystalline diamond composite sheet as described in claim 24, characterized in that, The annular decobalt-removed layer is divided into an edge decobalt-removed region and a flat decobalt-removed region according to different depths. The flat decobalt-removed region is close to the undecobalt-removed layer, and the edge decobalt-removed region is located outside the flat decobalt-removed region. The depth of the edge decobalt-removed region is greater than the depth of the flat decobalt-removed region. Let the radial width of the flat decobalt-removed region be a1, then the range of a1 is: 0 < a1 ≤ 2000 μm.

26. A polycrystalline diamond composite sheet as described in any one of claims 22-25, characterized in that, The top surface of the uncobalt-free layer can be either regular or irregular in shape.

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