Layered composite diamond-impregnated bit manufacturing die

Abstract

The utility model relates to a layered composite diamond-impregnated drill bit manufacturing mold, and belongs to the technical field of diamond drill bit manufacturing equipment, the layered composite diamond-impregnated drill bit manufacturing mold comprises a bottom mold and a core mold, and an annular containing groove is formed between the core mold and the bottom mold; the number of the first inserting blocks is multiple, and the multiple first inserting blocks are inserted into the annular containing groove at intervals and distributed around the core mold; and the number of the second inserting blocks is multiple, the multiple second inserting blocks are arranged between every two adjacent first inserting blocks in an inserted mode, and strip-shaped grooves are formed in the end faces, facing the bottom die, of the second inserting blocks. When the second inserting block presses materials through the ends where the strip-shaped grooves are located, the extrusion force borne by powder of the areas corresponding to the strip-shaped grooves and the working layers is small, the working layers with different density areas can be formed, after sintering forming, the end faces of the working layers form different hardness areas, the areas with the small hardness are abraded rapidly in the drilling process, grooves can be formed, then the blade parts are formed, and the service life of the blade parts is prolonged. The purpose of improving the drilling pressure and the drilling speed is achieved.

Description

Technical Field

[0001] This application relates to the technical field of diamond drill bit manufacturing equipment, and in particular to a layered composite impregnated diamond drill bit manufacturing mold. Background Technology

[0002] As geological exploration moves towards deep drilling, the types of rocks encountered are diverse and their lithology is complex and varied, which places increasingly higher demands on the performance and adaptability of impregnated diamond drill bits. Currently, the layered composite impregnated diamond drill bits developed have good performance, but their structure is relatively complex. They not only require high-quality and high-precision mold installation, but also fast mold installation speed.

[0003] In related technologies, patent CN102182405A discloses a layered composite diamond drill bit and its manufacturing process. The drill bit includes fan-shaped working blocks with sprues between them. The fan-shaped working blocks are layered composite, comprising diamond working layers and non-diamond layers, which are alternately combined, forming multiple layers. The manufacturing process involves cold-pressing the fan-shaped working blocks of the drill bit using a steel mold, assembling the multiple cold-pressed fan-shaped working blocks into a graphite mold, and then hot-pressing them to form the diamond drill bit.

[0004] However, the manufacturing process requires alternating layers of diamond working material and non-diamond material in a steel mold for cold pressing to pre-form a fan-shaped working block for the drill bit. This fan-shaped working block is then assembled into a graphite mold and hot-pressed in a medium-frequency electric furnace to produce the diamond drill bit. Because the sizes and widths of the various structural layers differ, loading becomes difficult, affecting both the loading speed and quality. Furthermore, to ensure molding efficiency, cold-pressing equipment must be purchased, resulting in high manufacturing costs. Summary of the Invention

[0005] In view of the shortcomings or deficiencies mentioned in the background technology, the present application provides a layered composite impregnated diamond drill bit manufacturing mold, which can improve the mold assembly speed and quality, and reduce the manufacturing cost.

[0006] This application provides a layered composite impregnated diamond drill bit manufacturing mold, including:

[0007] A bottom mold, wherein a cavity with an opening at one end is provided on the bottom mold;

[0008] A core mold is disposed within the cavity, and an annular receiving groove is formed between the core mold and the bottom mold;

[0009] The first insert block, there are multiple first insert blocks, and the multiple first insert blocks are inserted at intervals in the annular receiving groove and distributed around the core mold;

[0010] The second insert block, there are multiple second insert blocks, and the multiple second insert blocks are respectively inserted between two adjacent first insert blocks. The end face of the second insert block facing the bottom mold is provided with a strip groove.

[0011] In some embodiments, the strip groove is an arc-shaped groove, and the center of the arc-shaped groove is collinear with the axis of the core mold.

[0012] In some embodiments, the two ends of the arcuate groove extend to the two side walls of the second insert block and form lateral openings.

[0013] In some embodiments, the number of the strip grooves is two or more, and the strip grooves are spaced apart along a direction away from the core mold.

[0014] In some embodiments, the second insert is a fan-shaped strip, and one end of the second insert with the strip groove is a plane.

[0015] In some embodiments, the lengths of both the first and second inserts are greater than the depth of the annular receiving groove, and the length of the second insert is greater than the length of the first insert.

[0016] In some embodiments, there are gaps between the sidewalls of the first and second insert blocks and the annular receiving groove.

[0017] In some embodiments, the axis of the bottom mold coincides with the axis of the core mold, and the core mold and the bottom mold are detachably connected to each other.

[0018] In some embodiments, the core mold includes a large-diameter section and a small-diameter section arranged coaxially, and the bottom mold is provided with a mounting groove that matches the small-diameter section.

[0019] In some embodiments, the cavity within the bottom mold includes an annular sidewall and a bottom wall connecting the annular sidewall, the opening of the mounting groove is located on the bottom wall, and the bottom wall is a plane.

[0020] The beneficial effects of the technical solution provided in this application include:

[0021] This application provides a layered composite impregnated diamond drill bit manufacturing mold, including a bottom mold with a cavity open at one end; a core mold disposed in the cavity, with an annular receiving groove formed between the core mold and the bottom mold; a plurality of first inserts spaced apart in the annular receiving groove and distributed around the core mold; and a plurality of second inserts respectively inserted between two adjacent first inserts, with a strip groove provided on the end face of the second inserts facing the bottom mold.

[0022] Because the second insert has a groove on its end face facing the bottom mold, when the second insert uses the end of the groove to press the material, the working layer powder in the area corresponding to the groove experiences less extrusion pressure. After loading, working layers with different densities can be formed. After sintering, its end face can form areas with different hardness. Areas with lower hardness wear faster during drilling, forming grooves, which in turn form cutting edges, thereby increasing drilling pressure and drilling speed.

[0023] Since it is not necessary to separately fabricate the diamond working layer and non-diamond layer and then assemble them into a fan-shaped working block, the molding speed and molding quality can be improved. At the same time, using the mold of this application to manufacture impregnated diamond drill bits eliminates the need to purchase expensive cold pressing equipment, thus reducing manufacturing costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the assembly of the bottom mold and the core mold according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the assembly of the first and second insert blocks according to an embodiment of this application;

[0027] Figure 3 This is a top view of the first insert block according to an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the structure of the second insert block according to an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the steel body in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the structure of the sector-shaped working body according to an embodiment of this application.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Bottom mold; 11. Mounting groove; 2. Core mold; 21. Large diameter section; 22. Small diameter section; 3. First insert block; 4. Second insert block; 41. Strip groove; 5. Annular receiving groove; 6. Steel body; 7. Fan-shaped working body; 8. Sprue. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In view of the shortcomings or deficiencies mentioned in the background technology, the present application provides a layered composite impregnated diamond drill bit manufacturing mold, which can improve the mold assembly speed and quality, and reduce the manufacturing cost.

[0035] See Figures 1 to 6 As shown, this application provides a layered composite impregnated diamond drill bit manufacturing mold, comprising:

[0036] Bottom mold 1, with a cavity open at one end;

[0037] Core mold 2 is set in the cavity, and an annular receiving groove 5 is formed between the core mold 2 and the bottom mold 1;

[0038] The first insert 3, there are multiple first inserts 3, which are spaced out and inserted into the annular receiving groove 5 and distributed around the core mold 2;

[0039] The second insert 4, there are multiple second inserts 4, and the multiple second inserts 4 are respectively inserted between two adjacent first inserts 3. The end face of the second insert 4 facing the bottom mold 1 is provided with a strip groove 41.

[0040] In this embodiment of the application, the second insert 4 of the layered composite impregnated diamond drill bit manufacturing mold has a strip groove 41 on its end face facing the bottom mold 1. When the second insert 4 uses the end of the strip groove 41 to press the material, the working layer powder in the area corresponding to the strip groove 41 is subjected to less extrusion pressure. After the material is loaded, a working layer with different density areas can be formed. After sintering, its end face can form areas with different hardness. The area with lower hardness wears faster during drilling and can form a groove, which in turn forms a cutting edge, thereby achieving the purpose of increasing drilling pressure and drilling speed.

[0041] Since it is not necessary to separately fabricate the diamond working layer and non-diamond layer as in existing technologies, and then assemble them into a fan-shaped working block, the molding speed and molding quality can be improved. At the same time, using the mold of this application to manufacture impregnated diamond drill bits eliminates the need to purchase expensive cold pressing equipment, thus reducing manufacturing costs.

[0042] For example, firstly, based on the specifications of the impregnated diamond drill bit to be manufactured, the specifications of the fan-shaped working body 7 and the number and specifications of the sprue 8 are designed. The width of the sprue 8 is 5 to 8 mm, and the fan-shaped working body 7 is equally divided to determine its specifications. Then, the mold-mounting tool for the drill bit is designed.

[0043] See Figures 1 to 4 As shown, based on the specifications of the fan-shaped working body 7 of the drill bit, the specifications, dimensions and precision of the mold and material loading tools are designed, and the bottom mold 1, core mold 2, first insert block 3 and second insert block 4 are manufactured. The end face of the second insert block 4 is provided with a strip groove 41. The first insert block 3 is used to press the water inlet powder, and the second insert block 4 is used to press the working layer powder.

[0044] The first insert 3 and the second insert 4 are both made of DZ40 or DZ45 steel. The machining accuracy of the second insert 4 is ±(0.015~0.020)mm, and the height of the second insert 4 is 150mm with a height dimension accuracy of ±0.10mm.

[0045] For example, consider a 77 / 48mm diameter drill bit. The drill bit is designed with eight sprue marks 8 and eight fan-shaped working bodies 7. Each sprue mark 8 is 6mm wide, and the size of each fan-shaped working body 7 is one-eighth of the drill bit's bottom lip area after removing the sprue marks 8. Each second insert 4 is 150mm high, and the second insert 4 is used to mill two strip grooves 41 on its end face for clamping material, the shape of which is as follows... Figure 4 As shown, the second insert 4 is made of DZ40 steel.

[0046] During the molding process, the core mold 2 is assembled into the bottom mold 1, and multiple first insert blocks 3 and second insert blocks 4 are inserted at intervals into the annular receiving groove 5 formed by the bottom mold 1 and the core mold 2, with the end of the second insert block 4 with the strip groove 41 facing downwards.

[0047] Remove the fan-shaped second insert 4 and fill the formed groove with one-third of the working layer powder. Then insert the end of the second insert 4 with the groove 41 and apply pressure. Remove the second insert 4, embed the diamond grains, and level the filled powder. Fill in one-third of the working layer powder again and repeat the first powder filling process. Fill the powder three times, embed the diamond grains three times, and level the powder three times. Then insert the end of the second insert 4 without the groove 41 back in and press lightly to maintain the shape of the powder. This completes the powder filling process for one fan-shaped working body 7.

[0048] Repeat the above process until all the powder corresponding to each sector working body 7 of the drill bit is loaded into the mold; then, pull out the first insert block 3 in sequence, add the sprue powder, and insert the first insert block 3 back in for preliminary compaction. Keep pulling out one first insert block 3 at a time to fill the sprue powder, and insert the first insert block 3 back in after filling to compact in order to maintain the shape of the powder.

[0049] Finally, all the first insert blocks 3 and the second insert blocks 4 are removed, and welding layer powder is loaded into the annular receiving groove 5. After pressing on the steel body 6, it is sent into the medium frequency furnace to hot press out the impregnated diamond drill bit.

[0050] After cooling, the part is demolded to obtain the drill bit. The drill bit is then machined and decorated, and the water outlet 8 is cut to form a fan-shaped working body 7, thus completing the final manufacturing process of the drill bit.

[0051] Because the second insert block 4 has a groove 41, each time working layer powder is added, one end of the second insert block 4 with the groove 41 is pressed in, and after being pulled out, the working layer powder is smoothed. The working layer powder has a lower density at the pressing position corresponding to the groove 41. After several loading cycles, the density of the working layer powder corresponding to the pressing position of the groove 41 is significantly reduced. After sintering, this part has low hardness and low wear resistance, and wears faster during drilling, quickly forming concentric arc grooves, thus forming a cutting edge, thereby increasing drilling pressure and drilling speed.

[0052] Compared with existing impregnated diamond drill bit molds, the layered composite diamond drill bit manufacturing mold of this application has more advantages.

[0053] Specifically, because the structural layers of the layered composite impregnated diamond drill bit are of different sizes, some wide and some narrow, the existing method of first cold-pressing different structural layers individually and then assembling them into a fan-shaped working body 7 is complicated and difficult to operate, and the loading speed and quality will be affected. Although its forming efficiency is relatively high, it is necessary to purchase cold-pressing equipment costing 80,000 to 100,000 yuan, which requires frequent maintenance and upkeep, thus increasing the manufacturing cost.

[0054] The layered composite diamond drill bit manufacturing mold of this application is highly flexible in use, easy to adjust, reliable in performance, and low in cost.

[0055] Specifically, this application uses a fan-shaped loading tool with an improved structure. The second insert 4 with a groove 41 on the pressing end can form a working layer with different density areas after 2 to 5 loadings. After hot pressing and sintering, a layered composite structure impregnated diamond drill bit with stable quality can be obtained.

[0056] Corresponding fan-shaped loading tool Figure 4 As shown, the end face of the second insert 4 is machined with 2 to 5 grooves, which are set according to the specifications of the impregnated diamond drill bit and the properties of the rock. If the drill bit is large or the rock is hard and dense, more grooves are set, and the grooves are set narrower.

[0057] It should be noted that the purpose of this application is to modify the wear resistance of the matrix of the layered composite impregnated diamond drill bit and the diamond's cutting edge effect by utilizing the specifications and number of grooves on the second insert 4. The specifications and number of grooves on the second insert 4 can change the performance of the impregnated diamond drill bit. More and wider grooves reduce the wear resistance of the impregnated diamond drill bit, resulting in faster and higher diamond cutting edge emergence, thus increasing the drilling speed; conversely, fewer grooves have the opposite effect.

[0058] Because impregnated diamond drill bits with different specifications and numbers of grooves exhibit different wear resistance, diamond cutting edge effect, and drilling effect; therefore, by changing the width and number of grooves on the second insert 4, the performance of the drill bit, the drilling effect, and the adaptability of the drill bit to the rock can be changed.

[0059] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The strip groove 41 of the layered composite impregnated diamond drill bit manufacturing mold is an arc-shaped groove, and the center of the arc-shaped groove is collinear with the axis of the core mold 2.

[0060] In this embodiment, the strip groove 41 is an arc-shaped groove. When the second insert 4 is inserted into the annular receiving groove 5, the center of the arc-shaped groove falls on the axis of the core mold 2. By using an arc-shaped groove, arc-shaped areas of different hardness can be formed on the end face of the fan-shaped working body 7 of the drill bit. The arc-shaped areas with lower hardness wear faster during drilling, so that after the fan-shaped working body 7 wears during drilling, it can form an arc-shaped groove, which in turn forms a cutting edge, thereby increasing the drilling pressure and drilling speed.

[0061] In some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a layered composite impregnated diamond drill bit manufacturing mold. The two ends of the arc-shaped groove of the layered composite impregnated diamond drill bit manufacturing mold extend to the two side walls of the second insert 4 and form lateral openings.

[0062] In this embodiment, both ends of the arc-shaped groove are set as openings. When the second insert 4 is used for pressing, the powder remaining in the arc-shaped groove can be swept out from the opening by a brush, so as to facilitate cleaning of the second insert 4. In addition, the openings at both ends of the arc-shaped groove also facilitate the formation of an arc-shaped blade after the subsequent wear of the fan-shaped working body 7.

[0063] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The number of the layered composite impregnated diamond drill bit manufacturing mold is two or more, and the strip grooves 41 are spaced apart along the direction away from the core mold 2.

[0064] In this embodiment, the number of strip grooves 41 is two or more and they are spaced apart along the direction away from the core mold 2. The strip grooves 41 are arc-shaped and the centers of each strip groove 41 coincide, which facilitates the formation of concentric arc grooves after the subsequent wear of the fan-shaped working body 7, thereby forming multiple cutting edges.

[0065] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The second insert 4 of the layered composite impregnated diamond drill bit manufacturing mold is fan-shaped and long, and one end of the second insert 4 with the strip groove 41 is flat.

[0066] The second insert 4 in this embodiment is a fan-shaped strip with the same cross-section as the fan-shaped working body 7. The strip groove 41 is formed on the pressing end of the second insert 4. The pressing end is flat, which facilitates pressing out working layers with uneven density.

[0067] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The lengths of the first insert 3 and the second insert 4 of the layered composite impregnated diamond drill bit manufacturing mold are both greater than the groove depth of the annular receiving groove 5, and the length of the second insert 4 is greater than the length of the first insert 3.

[0068] In this embodiment, the lengths of the first plug 3 and the second plug 4 are both greater than the depth of the annular receiving groove 5, which facilitates the insertion or removal of the first plug 3 and the second plug 4; the length of the second plug 4 is greater than the length of the first plug 3, which facilitates the differentiation between the first plug 3 and the second plug 4.

[0069] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The sidewalls of the first insert 3 and the second insert 4 of the layered composite impregnated diamond drill bit manufacturing mold have gaps between them and the annular receiving groove 5.

[0070] In this embodiment, the sidewalls of the first insert 3 and the second insert 4 have gaps between them and the annular receiving groove 5. The gaps facilitate air intake when pulling out the inserts, and make it convenient for the first insert 3 and the second insert 4 to be inserted into or pulled out of the annular receiving groove 5.

[0071] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The axis of the bottom mold 1 of the layered composite impregnated diamond drill bit manufacturing mold coincides with the axis of the core mold 2, and the core mold 2 and the bottom mold 1 are detachably connected to each other.

[0072] In this embodiment, both the bottom mold 1 and the core mold 2 are cylindrical. The axis of the bottom mold 1 coincides with the axis of the core mold 2, forming an annular receiving groove 5 with a uniform cross-section. The core mold 2 and the bottom mold 1 are detachably connected to each other for easy assembly. For example, the core mold 2 and the bottom mold 1 can be connected by threads or snap-fit.

[0073] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The core mold 2 of the layered composite impregnated diamond drill bit manufacturing mold includes a large diameter section 21 and a small diameter section 22 arranged coaxially, and the bottom mold 1 is provided with an installation groove 11 that matches the small diameter section 22.

[0074] The core mold 2 of this application embodiment includes a large diameter section 21 and a small diameter section 22 arranged coaxially. The large diameter section 21 and the small diameter section 22 are integrally connected. The bottom mold 1 is provided with an installation groove 11. The small diameter section 22 can be inserted into the installation groove 11 so that the core mold 2 and the bottom mold 1 can be combined together.

[0075] In some alternative embodiments: see Figures 1 to 6 As shown in the embodiment of this application, a layered composite impregnated diamond drill bit manufacturing mold is provided. The cavity in the bottom mold 1 of the layered composite impregnated diamond drill bit manufacturing mold includes an annular sidewall and a bottom wall connecting the annular sidewall. The opening of the mounting groove 11 is located on the bottom wall, and the bottom wall is a plane.

[0076] In this embodiment, the mounting groove 11 is located in the center of the bottom wall of the cavity. After the small diameter section 22 of the core mold 2 is inserted into the mounting groove 11, an annular receiving groove 5 with a uniform cross-section can be formed. The bottom wall is flat, so that the end face of the unused fan-shaped working body 7 can remain flat.

[0077] The layered composite impregnated diamond drill bit manufacturing mold of this application is characterized by creating a heterogeneous drill bit matrix, that is, a regularly distributed, annular structure with alternating layers of soft and hard materials. During drilling, the harder annular portion of the drill bit is the main body for breaking the rock, i.e., the portion not corresponding to the grooves; while the softer portion plays a supporting role in breaking the rock, i.e., the portion corresponding to the grooves. The loading process creates low pressure in the portion corresponding to the grooves, resulting in low matrix density, easy wear, and the formation of raised rock ridges on the rock at the bottom of the hole.

[0078] The grooves correspond to the bottom of the borehole, forming prominent rock ridges with well-developed fractures. These ridges are easily broken by the vibration of the drill string and the erosion of the well-washing fluid. Therefore, this improves drilling efficiency and the drill bit's adaptability to different rock types. It is evident that using the mold of this application results in a drill bit matrix with uneven density and performance, but within a predictable pattern. Rock breaking is achieved through a combination of volumetric and cutting crushing methods, resulting in high rock breaking efficiency and good drilling performance. The groove depth on the second insert 4 can be used to adjust the wear resistance and adaptability of the drill bit matrix.

[0079] The drill bits manufactured using the mold of this application exhibit superior drilling performance. Ordinary impregnated diamond drill bits, when drilling into hard, dense rock, can only achieve a drilling speed of 0.5 to 0.8 m / h, and the lifespan of a single drill bit is only 15 to 20 hours. In contrast, the impregnated diamond drill bits manufactured using the mold of this application, when drilling into the same type of rock, can achieve a drilling speed of 1.0 to 1.5 m / h compared to ordinary drill bits, and the lifespan of the drill bit can be increased to 35 to 42 minutes. Furthermore, the manufacturing cost of the drill bit has not increased, while the loading speed is significantly improved, demonstrating the clear advantages of the drill bit of this application.

[0080] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0081] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A layered composite impregnated diamond drill bit manufacturing mold, characterized in that, include: Bottom mold (1), wherein a cavity with an opening at one end is provided on the bottom mold (1); Core mold (2), the core mold (2) is disposed in the cavity, and an annular receiving groove (5) is formed between the core mold (2) and the bottom mold (1); The first insert (3) is a plurality of the first inserts (3), which are spaced apart and inserted into the annular receiving groove (5) and distributed around the core mold (2); The second insert (4) has multiple second inserts (4), which are respectively inserted between two adjacent first inserts (3). The end face of the second insert (4) facing the bottom mold (1) is provided with a strip groove (41).

2. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 1, characterized in that: The strip groove (41) is an arc-shaped groove, and the center of the arc-shaped groove is collinear with the axis of the core mold (2).

3. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 2, characterized in that: The two ends of the arc-shaped groove extend to the two side walls of the second insert (4) and form a lateral opening.

4. The layered composite impregnated diamond drill bit manufacturing mold as described in any one of claims 1 to 3, characterized in that: The number of the strip grooves (41) is two or more, and the strip grooves (41) are spaced apart along a direction away from the core mold (2).

5. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 1, characterized in that: The second insert (4) is fan-shaped and long, and one end of the strip groove (41) of the second insert (4) is flat.

6. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 1 or 5, characterized in that: The lengths of the first insert (3) and the second insert (4) are both greater than the depth of the annular receiving groove (5), and the length of the second insert (4) is greater than the length of the first insert (3).

7. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 1, characterized in that: There are gaps between the sidewalls of the first insert (3) and the second insert (4) and the annular receiving groove (5).

8. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 1, characterized in that: The axis of the bottom mold (1) coincides with the axis of the core mold (2), and the core mold (2) and the bottom mold (1) are detachably connected to each other.

9. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 1 or 8, characterized in that: The core mold (2) includes a large diameter section (21) and a small diameter section (22) arranged coaxially, and the bottom mold (1) is provided with an installation groove (11) that matches the small diameter section (22).

10. The layered composite impregnated diamond drill bit manufacturing mold as described in claim 9, characterized in that: The cavity inside the bottom mold (1) includes an annular sidewall and a bottom wall connecting the annular sidewall. The opening of the mounting groove (11) is located on the bottom wall, which is a plane.

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