A method of manufacturing a diamond tip

Abstract

The application discloses a preparation method of a diamond tool bit, and the hot-pressing die of the diamond tool bit is aimed at a drill cutting tool bit and a sharp corner tool bit, the upper pressing head and the lower pressing head are respectively divided into two parts, so that the structure of the die pressing head group is simpler, and the manufacturing cost is lower; and the hot-pressing pressure can be provided according to the shrinkage ratio during hot-pressing sintering, and the use is more flexible; the top of the drilling end surface of the prepared diamond tool bit is formed into a triangular sharp top cutting edge, excellent self-sharpening and sharpness of the tool bit are maintained, wear resistance is high, and the service life is long; the size and shape error of the formed diamond tool bit are small, the precision is high, and the quality is good; the diamond drill bit can quickly cut into the drilled material, the drilling speed of the tool bit is improved, the drilling sharpness is improved, and the cutting stability and safety are ensured.

Description

[0001] The present application is a divisional application of Chinese Patent Application No. 202210440404.7, the original application number of which is 202210440404.7, the filing date of which is April 25, 2022, and the invention name of which is a hot-pressing mold for a diamond tool bit, a preparation method of a diamond tool bit, a diamond tool bit, and a diamond drill bit. TECHNICAL FIELD

[0002] The present application relates to the technical field of diamond tool bits, in particular to a preparation method of a diamond tool bit. BACKGROUND

[0003] A diamond drill bit is a tool used for drilling stone, concrete, brick walls, etc., has high strength, high wear resistance, and impact resistance, is widely used in drilling processing, can adapt to higher grinding, high concrete grade, and excellent cutting performance. The diamond drill bit includes a base body and a diamond tool bit. The diamond tool bit is formed by bonding diamond particles and a matrix binder together. The diamond particles mainly serve as cutting edges. When drilling into the stratum, the diamond drill bit is aligned with the drilling position, and the diamond drill bit rotates to drill the stratum through the diamond tool bit to realize drilling work. However, the existing diamond tool bit is in the shape of an arc-shaped sheet, and has a sharp tooth on the drilling end face. The thickness of the entire diamond tool bit is uniform. When drilling, the diamond tool bit is prone to becoming dull, and the drilling speed of the diamond drill bit is slow, which cannot meet the needs of overall construction efficiency.

[0004] The existing diamond tool bit has the following problems in the manufacturing process:

[0005] 1. The existing diamond tool bit generally has two steps of cold-pressing forming process and hot-pressing forming process in the manufacturing process. The hot-pressing forming process determines important parameters such as the performance and quality of the diamond tool bit. Therefore, the hot-pressing mold for the diamond tool bit is the key to the forming of the diamond tool bit. The existing hot-pressing mold has a mold frame, an upper pressing head, and a lower pressing head. The structure of the upper pressing head and the lower pressing head is set according to different sharp tooth structures of the diamond tool bit. The structure of the sharp tooth leads to the complexity of the manufacturing of the upper pressing head and the lower pressing head. Moreover, the upper pressing head and the lower pressing head are respectively manufactured into an integral structure, which has a very high manufacturing cost.

[0006] 2. The diamond tool bit shrinks when heated and sintered, that is, the volume of the diamond tool bit before heating and sintering is larger than that after heating and sintering. The shrinkage ratios of the arc-shaped sheet part and the sharp tooth part are different. If the upper pressing head and the lower pressing head of the hot-pressing mold are manufactured into an integral structure, the same pressure can only be applied to the arc-shaped sheet part and the sharp tooth part at the same time, which leads to the fact that the overall structure of the diamond tool bit is not compact when hot-pressing and sintering. This causes large errors in the size and shape of the formed diamond tool bit, low precision, and poor quality.

[0007] 3. During the hot pressing process, the tips of the upper and lower pressing heads of the existing hot pressing mold are easily damaged, and the entire mold can only be discarded, which shortens the service life of the hot pressing mold.

[0008] 4. Due to the different structures of the arc-shaped sheet part and the pointed tooth part, the distribution structure of diamond particles in the diamond segment is easily changed during the pressing process of the upper and lower pressure heads of the mold, and the self-sharpening, sharpness and wear resistance of the diamond segment will deteriorate.

[0009] In view of this, the inventors have focused on the numerous deficiencies and inconveniences caused by the imperfections in the manufacturing process of the aforementioned diamond segments, and have actively researched, improved, and trial-produced the present invention. Summary of the Invention

[0010] The first purpose of the present invention is to provide a method for preparing a diamond cutter head. For a drilling cutter head and a pointed-angle cutter head, an upper pressing head and a lower pressing head are respectively divided into two parts, and hot pressing pressure can be provided according to the shrinkage ratio during hot pressing and sintering, so that the drilling cutter head and the pointed-angle cutter head can be pressed separately, which makes the use more flexible; the quality of the diamond cutter head is better, sharper, and more wear-resistant; and the errors in size and shape of the formed diamond cutter head are small, the precision is high, and the quality is good.

[0011] In order to achieve the above object, the solution of the present invention is:

[0012] A hot pressing mold for a diamond cutter head, the hot pressing mold comprising at least one mold frame and a group of mold head groups arranged corresponding to the mold frame, the mold head group comprising a first upper press head, a first lower press head, a second upper press head and a second lower press head, the first lower press head and the second lower press head being arranged side by side in the mold frame, the first upper press head and the second upper press head being pressed above the first lower press head and the second lower press head respectively; the first upper press head and the first lower press head forming a drilling cutter head mold cavity in the mold frame, the second upper press head and the second lower press head forming a pointed cutter head mold cavity in the mold frame, the drilling cutter head mold cavity and the pointed cutter head mold cavity being connected.

[0013] The hot-pressing die of the diamond tool bit is provided with upper and lower pressing heads, and the upper and lower pressing heads are divided into two parts respectively, so that the structure of the die pressing head group is simpler and the manufacturing cost is lower; the second upper pressing head and the second lower pressing head are used for pressing the sharp corner tool bit, so that the second upper pressing head and the second lower pressing head have sharp corner parts, and the second upper pressing head and the second lower pressing head can be replaced individually when the sharp corner parts are damaged during the hot-pressing process, thereby prolonging the service life of the hot-pressing die; in addition, during the hot-pressing and sintering of the diamond tool bit, the first lower pressing head and the second lower pressing head are assembled in the die frame first, then the diamond tool bit raw material is placed on the first lower pressing head and the second lower pressing head, and then the first upper pressing head and the second upper pressing head are pressed on the diamond tool bit raw material for heating and sintering; the hot-pressing pressure can be provided according to the shrinkage ratio during the hot-pressing and sintering, the drill tool bit and the sharp corner tool bit are pressed respectively, and the quality of the diamond tool bit is better and the use is more flexible.

[0014] The bottom surface of the first upper pressing head is formed with a circular-arc convex surface, the top surface of the first lower pressing head is formed with a circular-arc concave surface, and the circular-arc convex surface and the circular-arc concave surface enclose a drill tool bit die cavity with a rectangular longitudinal section; the bottom surface of the second upper pressing head is formed with a first circular-arc inclined surface, the top surface of the second lower pressing head is formed with a second circular-arc inclined surface, and the first circular-arc inclined surface and the second circular-arc inclined surface enclose a sharp corner tool bit die cavity with a triangular longitudinal section.

[0015] The circular-arc convex surface and the first circular-arc inclined surface are connected together, and the first circular-arc inclined surface is inclined from one side connected with the circular-arc convex surface to the other side and gradually shrinks downward; the circular-arc concave surface and the second circular-arc inclined surface are connected together, and the second circular-arc inclined surface is inclined from one side connected with the circular-arc concave surface to the other side and gradually shrinks upward.

[0016] The first upper pressing head and the first lower pressing head, and the second upper pressing head and the second lower pressing head are distributed vertically, and the direction of the hot-pressing and pressing is along the thickness direction of the diamond tool bit.

[0017] The hot-pressing die further has two partition walls and a plurality of partition plates, and the two partition walls divide three cavities in the hot-pressing die; five partition plates are arranged in each cavity, and each cavity is divided into six die frames, and a set of die pressing head groups is arranged in each die frame.

[0018] A preparation method of a diamond tool bit has the following steps:

[0019] S1, a drill cold pressing blank and a sharp corner cold pressing blank are respectively cold pressed by using a cold pressing die;

[0020] S2, the first lower pressing head and the second lower pressing head are assembled side by side in the die frame of the hot-pressing die; then the drill cold pressing blank and the sharp corner cold pressing blank are respectively placed on the first lower pressing head and the second lower pressing head; and then the first upper pressing head and the second upper pressing head are respectively pressed on the drill cold pressing blank and the sharp corner cold pressing blank.

[0021] S3, the hot-pressing mold is heated to hot-press sinter the drill cutting cold-pressed blank and the sharp corner cold-pressed blank together;

[0022] S4, the diamond tool bit is demolded.

[0023] The preparation method of the diamond tool bit can make the distribution structure of the diamond particles in the drill cutting tool bit and the sharp corner tool bit not change in the hot-press sintering process, the prepared diamond tool bit is sharper and has high wear resistance; and the hot-pressing pressure can be provided according to the shrinkage ratio in the hot-press sintering, the drill cutting tool bit and the sharp corner tool bit are pressed respectively, the size and shape error of the formed diamond tool bit is small, the precision is high, and the quality is good.

[0024] In step S2, the hot-pressing mold adopts the flat pressing method, the hot-pressing pressing direction is along the thickness direction of the diamond tool bit; and the pressing forces of the first upper pressing head and the second upper pressing head are the same or different.

[0025] In step S1, the diamond particles in the drill cutting cold-pressed blank are orderly arranged; and the diamond particles in the sharp corner cold-pressed blank are not orderly arranged.

[0026] A diamond tool bit, the diamond tool bit is an arc-shaped sheet, including a drill cutting tool bit with a rectangular longitudinal section and a sharp corner tool bit with a triangular longitudinal section, the bottom surface of the drill cutting tool bit is a mounting surface fixedly connected to a base body, and the intersection edge of the two inclined surfaces of the sharp corner tool bit is a drill cutting edge.

[0027] The sharp corner tool bit of the diamond tool bit is easy to be sharpened, a triangular pointed tool bit is formed at the top of the drill cutting end face, excellent self-sharpening and sharpness of the tool bit are maintained, the wear resistance is high, the drill cutting processing efficiency is high, the quality is good, and the service life is long.

[0028] A diamond drill bit includes a cylindrical base body and a plurality of the diamond tool bits, and the diamond tool bits are uniformly distributed at the end of the base body.

[0029] The diamond drill bit has the above-mentioned diamond tool bit, so that the diamond drill bit can quickly cut into the material to be drilled, the drill cutting speed of the tool bit is improved, the drill cutting sharpness is improved, and the cutting stability and safety are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure schematic view of the hot-pressing mold of the diamond tool bit of the present application;

[0031] Figure 2A side view schematic diagram of the hot-pressing die for the diamond tool bit of the present application;

[0032] Figure 3 A sectional view schematic diagram of the hot-pressing die for the diamond tool bit of the present application;

[0033] Figure 4 A structure schematic diagram of the hot-pressing die for the diamond tool bit of the present application;

[0034] Figure 5 Another direction structure schematic diagram of the hot-pressing die for the diamond tool bit of the present application;

[0035] Figure 6 A structure schematic diagram of the hot-pressing die for the diamond tool bit of the present application;

[0036] Figure 7 A exploded schematic diagram of the hot-pressing die for the diamond tool bit of the present application;

[0037] Figure 8 A structure schematic diagram of the diamond tool bit of the present application;

[0038] Figure 9 A side view schematic diagram of the diamond tool bit of the present application.

[0039] Symbol explanation

[0040] Hot-pressing die 1; die frame 11; die press head group 12; first upper press head 121; first lower press head 122; second upper press head 123; second lower press head 124; drill and cut tool bit die cavity 13; sharp corner tool bit die cavity 14; circular arc convex surface 1211; circular arc concave surface 1221; first circular arc inclined surface 1231; second circular arc inclined surface 1241; partition wall 15; partition plate 16; cavity 17; diamond tool bit 2; drill and cut tool bit 21; sharp corner tool bit 22; mounting surface 211; inclined surface 221; drill and cut edge 222. DETAILED DESCRIPTION

[0041] In order to further explain the technical solutions of the present application, the present application will be described in detail below through specific embodiments.

[0042] Please refer to Figures 1 to 9The application discloses a hot-pressing die for diamond tool bits, which comprises at least one die frame 11 and a set of die pressing heads 12 arranged in the die frame 11, wherein the die pressing heads 12 comprise a first upper pressing head 121, a first lower pressing head 122, a second upper pressing head 123 and a second lower pressing head 124, the first lower pressing head 122 and the second lower pressing head 124 are arranged side by side in the die frame 11, and the first upper pressing head 121 and the second upper pressing head 123 are respectively pressed above the first lower pressing head 122 and the second lower pressing head 124; the first upper pressing head 121 and the first lower pressing head 122 enclose a drill bit die cavity 13 in the die frame 11, the second upper pressing head 123 and the second lower pressing head 124 enclose a sharp corner bit die cavity 14 in the die frame 11, and the drill bit die cavity 13 and the sharp corner bit die cavity 14 are communicated.

[0043] The hot-pressing die 1 for diamond tool bits is used for pressing drill bits 21 and sharp corner bits 22, the upper pressing head and the lower pressing head are divided into two parts respectively, the structure of the die pressing heads 12 is simpler, and the manufacturing cost is lower; the second upper pressing head 123 and the second lower pressing head 124 are used for pressing sharp corner bits, the second upper pressing head 123 and the second lower pressing head 124 have sharp corner parts, if the sharp corner parts are damaged in the hot-pressing process, the second upper pressing head 123 and the second lower pressing head 124 can be replaced and used continuously, so that the service life of the hot-pressing die 1 is prolonged; when the diamond tool bits 2 are hot-pressed and sintered, the first lower pressing head 122 and the second lower pressing head 124 are assembled in the die frame 11 first, then the diamond tool bit raw materials are placed on the first lower pressing head 122 and the second lower pressing head 124, and then the first upper pressing head 121 and the second upper pressing head 123 are pressed on the diamond tool bit raw materials to perform heating and sintering; the hot-pressing pressure can be provided according to the shrinkage ratio in the hot-pressing and sintering process, the drill bits 21 and the sharp corner bits 22 are pressed respectively, the quality of the diamond tool bits 2 is better, and the diamond tool bits 2 are more flexible to use.

[0044] The bottom surface of the first upper pressing head 121 is formed with a circular-arc convex surface 1211, the top surface of the first lower pressing head 122 is formed with a circular-arc concave surface 1221, the circular-arc convex surface 1211 and the circular-arc concave surface 1221 enclose the drill bit die cavity 13 with a rectangular longitudinal section; the bottom surface of the second upper pressing head 123 is formed with a first circular-arc inclined surface 1231, the top surface of the second lower pressing head 124 is formed with a second circular-arc inclined surface 1241, the first circular-arc inclined surface 1231 and the second circular-arc inclined surface 1241 enclose the sharp corner bit die cavity 14 with a triangular longitudinal section; the first upper pressing head 121, the first lower pressing head 122, the second upper pressing head 123 and the second lower pressing head 124 are hot-pressed and formed into the arc-shaped sheet-shaped diamond tool bits 2, the diamond tool bits 2 form triangular pointed bit edges on the top of the drill bit end surface, have excellent bit self-sharpening performance and sharpness, high wear resistance, high drill cutting processing efficiency, good quality and long service life.

[0045] The arc convex surface 1211 and the first arc inclined surface 1231 are connected together, the first arc inclined surface 1231 is inclined from one side to the other side and gradually shrinks downwardly; the arc concave surface 1221 and the second arc inclined surface 1241 are connected together, the second arc inclined surface 1241 is inclined from one side to the other side and gradually shrinks upwardly; the diamond tool bit 2 made of the hot-pressing die 1 has two inclined surfaces, forms a triangular pointed blade, has excellent self-sharpening and sharpness, strong wear resistance, high drilling and cutting efficiency, good quality and long service life.

[0046] The first upper pressing head 121 and the first lower pressing head 122, the second upper pressing head 123 and the second lower pressing head 124 are respectively distributed up and down, the hot-pressing direction is along the thickness direction of the diamond tool bit; during hot-pressing sintering, the drilling and cutting tool bit 21 and the pointed tool bit 22 are horizontally placed and sintered together, the first upper pressing head 121 and the first lower pressing head 122 are respectively pressed on the upper and lower drilling and cutting tool bit 21, and the second upper pressing head 123 and the second lower pressing head 124 are respectively pressed on the upper and lower pointed tool bit 22, so that the distribution structure of the diamond particles in the drilling and cutting tool bit 21 and the pointed tool bit 22 is prevented from changing, and the diamond tool bit made has better sharpness and wear resistance; if the hot-pressing direction is along the height direction of the diamond tool bit, the structures of the drilling and cutting tool bit 21 and the pointed tool bit 22 are easily deformed, and the diamond particles in the drilling and cutting tool bit 21 and the pointed tool bit 22 are changed, so that the sharpness and wear resistance of the diamond tool bit 2 made are deteriorated.

[0047] The hot-pressing die 1 further has two partition walls 15 and a plurality of partition plates 16, the two partition walls 15 divide three cavities 17 in the hot-pressing die 1; five partition plates 16 are arranged in each cavity 17, and each cavity 17 is divided into six die frames 11, and a set of die pressing head groups 12 is arranged corresponding to each die frame 11; a plurality of die frames 11 and a plurality of sets of die pressing head groups 12 are arranged on the hot-pressing die 1, so that a plurality of diamond tool bits 2 can be simultaneously hot-pressed and sintered, and the production efficiency is improved.

[0048] The application further discloses a preparation method of the diamond tool bit, which has the following steps:

[0049] S1, a drilling and cutting cold-pressed blank and a pointed cold-pressed blank are respectively cold-pressed by using a cold-pressing die;

[0050] S2, the first lower pressing head 122 and the second lower pressing head 124 are assembled side by side in the die frame 11 of the hot-pressing die 1; then the drilling and cutting cold-pressed blank and the pointed cold-pressed blank are respectively placed on the first lower pressing head 122 and the second lower pressing head 124; and then the first upper pressing head 121 and the second upper pressing head 123 are respectively pressed on the drilling and cutting cold-pressed blank and the pointed cold-pressed blank.

[0051] S3, the hot pressing mold 1 heats to hot press sinter the drill cutting cold pressing blank and the sharp corner cold pressing blank together;

[0052] S4, the diamond tool bit is demolded.

[0053] The preparation method of the diamond tool bit can make the distribution structure of diamond particles in the drill cutting tool bit 21 and the sharp corner tool bit 22 not change in the hot pressing sintering process, and the prepared diamond tool bit 2 is more sharp and has high wear resistance.

[0054] In step S2, the hot pressing mold 1 adopts the flat pressing method, the hot pressing pressing direction is along the thickness direction of the diamond tool bit, and the pressing force of the first upper pressing head 121 and the second upper pressing head 123 is the same or different.

[0055] In step S1, the diamond particles in the drill cutting cold pressing blank are orderly arranged, and the diamond particles in the sharp corner cold pressing blank are not orderly arranged.

[0056] The application further discloses a diamond tool bit.

[0057] The sharp corner tool bit of the diamond tool bit is easy to be sharpened, a triangular pointed tool bit is formed at the top of a drill cutting end face, excellent self-sharpening and sharpness of the tool bit are maintained, wear resistance is high, drill cutting processing efficiency is high, quality is good, and service life is long.

[0058] The invention also discloses a diamond drill bit, which comprises a cylindrical base body and a plurality of diamond cutters 2, and the diamond cutters 2 are uniformly distributed on the end of the base body.

[0059] The diamond drill bit has the diamond cutters 2, so that the diamond drill bit can quickly cut into the material to be drilled, the drilling speed of the cutter is improved, the drilling sharpness is improved, and the cutting stability and safety are ensured.

[0060] The above examples and drawings are not intended to limit the product form and style of the invention, and any appropriate changes or modifications made by those skilled in the art shall be considered as not departing from the patent scope of the invention.

Claims

1. A method for preparing a diamond tool segment, characterized in that: The following steps are involved: S1, using a cold pressing mold to cold press the drilled cold pressed billet and the sharp-angled cold pressed billet in advance; S2, placing the drilled cold pressed billet and the sharp-angled cold pressed billet into the hot pressing mold; The hot pressing mold includes at least one mold frame and a group of mold head groups arranged corresponding to the mold frame. The mold head group includes a first upper press head, a first lower press head, a second upper press head and a second lower press head. The first lower press head and the second lower press head are arranged side by side in the mold frame, and the first upper press head and the second upper press head are pressed above the first lower press head and the second lower press head respectively; the first upper press head and the first lower press head form a drilling cutter head mold cavity in the mold frame, and the second upper press head and the second lower press head form a sharp-angled cutter head mold cavity in the mold frame, and the drilling cutter head mold cavity and the sharp-angled cutter head mold cavity are connected; first, the first lower press head and the second lower press head are assembled side by side in the mold frame of the hot pressing mold; then, the drilled and cut cold pressed billet and the sharp-angled cold pressed billet are placed on the first lower press head and the second lower press head respectively; then, the first upper press head and the second upper press head are pressed on the drilled and cut cold pressed billet and the sharp-angled cold pressed billet respectively; S3, hot pressing mold heating to hot press and sinter the drilled cold pressed billet and the sharp corner cold pressed billet together, providing hot pressing pressure according to the shrinkage ratio during hot pressing and sintering; S4. De-mould the diamond cutter head.

2. The method for preparing a diamond tool segment according to claim 1, wherein: In step S2, the hot pressing mold adopts a flat pressing method, and the hot pressing direction is along the thickness direction of the diamond bit; and the pressures of the first upper pressing head and the second upper pressing head are the same or different.

3. The method for preparing a diamond tool segment according to claim 1, wherein: In step S1, the diamond particles in the drilled cold-pressed blank are arranged in an orderly manner; the diamond particles in the sharp-angled cold-pressed blank are arranged in an unordered manner.

4. The method for preparing a diamond tool segment according to claim 1, wherein: In step S1, the diamond particles in the drilled cold-pressed blank are arranged in a non-ordered manner; or the diamond particles in the sharp-angled cold-pressed blank are arranged in an ordered manner.

5. The method for preparing a diamond tool segment according to claim 1, wherein: The bottom surface of the first upper pressure head is formed with a circular arc convex surface, and the top surface of the first lower pressure head is formed with a circular arc concave surface. The circular arc convex surface and the circular arc concave surface form a drilling and cutting head mold cavity with a rectangular longitudinal section; the bottom surface of the second upper pressure head is formed with a first circular arc inclined surface, and the top surface of the second lower pressure head is formed with a second circular arc inclined surface. The first circular arc inclined surface and the second circular arc inclined surface form a pointed-angled head mold cavity with a triangular longitudinal section.

6. A method for preparing a diamond tool segment according to claim 5, characterized in that: The hot pressing mold also has two partition walls and multiple partitions. The two partition walls separate three cavities in the hot pressing mold; five partitions are set in each cavity, and each cavity is divided into six mold frames, and a group of mold pressure heads is set corresponding to each mold frame.

7. A method for preparing a diamond tool segment according to claim 6, characterized in that: The first upper pressing head and the first lower pressing head, the second upper pressing head and the second lower pressing head are respectively distributed up and down, and the direction of hot pressing is along the thickness direction of the diamond bit.

Images