Composite hard alloy holding-up hammer and preparation method of supporting assembly in holding-up hammer

Abstract

The composite hard alloy holding-up hammer structurally comprises a cylindrical supporting assembly, the supporting assembly is sleeved with a supporting ring, the supporting assembly comprises a pressure-bearing block and a hollow sealing column, the sealing column is connected with the pressure-bearing block in a sleeved mode, the sealing column is connected with the supporting ring in a sleeved mode, and the sealing column is located between the pressure-bearing block and the supporting ring; the material of the composite hard alloy holding-up hammer is that a pressure-bearing block is composed of tungsten-cobalt alloy, reinforced phase silicon carbide, boron carbide and graphene composite powder, and a sealing column is composed of steel powder, copper powder, aluminum powder and titanium powder. The supporting ring is made of nickel-containing alloy steel; the invention further discloses a preparation method of the supporting assembly in the composite hard alloy holding-up hammer, materials of the supporting assembly are weighed, and the weighed materials are fired and polished after being subjected to ball milling; the problem of blasting caused by high brittleness and insufficient wear resistance of holding-up hammer materials in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of superhard material synthesis equipment and relates to a composite hard alloy top hammer. The invention also relates to a method for preparing a supporting component in the composite hard alloy top hammer. Background Art

[0002] Artificial diamond is a superhard material with extremely high hardness and excellent physical and chemical properties. It is widely used in industry, science and technology, national defense and other fields. In the process of synthetic diamond synthesis, the top hammer is one of the key components, and its performance directly affects the synthesis effect. At present, the common top hammer materials on the market are mostly cemented carbide, but the single cemented carbide integrated design has certain limitations, such as high brittleness, insufficient wear resistance, insufficient resistance to "blasting" impact, and poor holding force on the talc sealing edge during synthesis. Therefore, it is of great significance to study a composite cemented carbide top hammer with excellent performance to solve the problems existing in the above-mentioned single cemented carbide top hammer. Summary of the invention

[0003] The purpose of the present invention is to provide a composite cemented carbide top hammer, which solves the problem of blasting caused by the high brittleness and insufficient wear resistance of the top hammer material in the prior art.

[0004] Another object of the present invention is to provide a method for preparing the support assembly in the composite carbide top hammer, thereby solving the problem that the support assembly is prone to breakage during operation due to the single material.

[0005] The technical solution adopted by the present invention is a composite carbide top hammer, and the structure of the composite carbide top hammer is as follows: it includes a support assembly in the form of a column, the support assembly is covered with a support ring, the support assembly includes a pressure block and a hollow sealing column, the sealing column is sleeved with the pressure block, the sealing column is sleeved with the support ring, and the sealing column is located between the pressure block and the support ring;

[0006] The materials of the composite carbide top hammer are as follows: the pressure block is composed of tungsten-cobalt alloy, reinforcing phase silicon carbide, boron carbide and graphene composite powder, the sealing column is composed of steel powder, copper powder, aluminum powder and titanium powder; the support ring is nickel-containing alloy steel.

[0007] The present invention is also characterized in that:

[0008] One end surface of the support ring is provided with a first cut angle along the circumferential direction, the end surface of the sealing column close to the first cut angle is provided with a second cut angle along the circumferential direction, and the end surface of the pressure block close to the second cut angle is provided with a third cut angle.

[0009] The third cut corner is provided with a chamfer near the second cut corner.

[0010] The angle between the second cutting angle and the sealing column axis is equal to the angle between the first cutting angle and the sealing column axis; the angle between the third cutting angle and the sealing column axis is not less than the angle between the second cutting angle and the sealing column axis; the first cutting angle and the second cutting angle are located on the same straight line.

[0011] The components in the pressure block are calculated by weight and specifically include: 7 to 9 parts of tungsten-cobalt alloy, 0.5 to 1.0 parts of reinforcing phase silicon carbide, 0.3 to 1.0 parts of boron carbide and 0.2 to 1.0 parts of graphene composite powder.

[0012] The components in the sealing column are calculated by weight and specifically include: 8 to 8.2 parts of steel powder, 1.1 to 1.2 parts of copper powder, 0.15 to 0.2 parts of aluminum powder and 0.2 to 0.3 parts of titanium powder.

[0013] Another technical solution adopted by the present invention is a method for preparing a supporting component in a composite cemented carbide top hammer, using a composite cemented carbide top hammer, and the specific operating steps are as follows:

[0014] Step 1, weigh the materials required for the pressure-bearing block and the sealing column in the support assembly respectively according to mass parts to obtain the pressure-bearing block and the sealing column prepared materials;

[0015] Step 2, the pressure block material and alcohol are mixed in a ratio of 1:0.15-0.25 and put into a first ball mill, and the sealing column material and alcohol are mixed in a ratio of 1:0.15-0.25 and put into a second ball mill, and both are ball-milled in an inert gas at 30°C±3°C for 20h-35h to obtain a first ball-milled powder and a second ball-milled powder;

[0016] Step 3, respectively introducing the first ball-milled powder and the second ball-milled powder into different molds, and pressing them by cold pressing for 1350s to 1490s to obtain a preform;

[0017] Step 4, placing the blank into a vacuum sintering furnace for firing to obtain a cemented carbide;

[0018] Step 5: Grind and polish the cemented carbide to obtain a support component.

[0019] Another technical solution of the present invention is also characterized in that:

[0020] The specific pressure changes during the cold pressing treatment in step 3 are as follows: the pressure is increased to 35MPa at 0.7MPa / s within 50s and maintained for 10s-15s; then the pressure is increased to the primary stage point of 59MPa; the pressure is increased to the secondary stage point of 117Mpa at 1.9MPa / s~2.5MPa / s within 23s-30s; the pressure is increased to the tertiary stage point of 131MPa at 0.56MPa / s~0.7MPa / s within 20-25s; within 600-700s, the pressure is increased to the maximum pressure value of 175MPa at 0.063MPa / s~0.0738MPa / s, and maintained for 500s; then the pressure is released at 1MPa / s-1.2MPa / s within 150s-170s to finally obtain the blank.

[0021] The specific process of firing in step 4 is: heating to a primary high temperature value of 1260°C at 3.5°C / s to 4.9°C / s within 255s-355s; heating to a secondary high temperature point of 1430°C at 1.5°C / s to 2.3°C / s within 75s-115s; cooling to 1320°C at 0.5 to 0.6°C / s within 175s-205s, then heating to 1400°C at 0.1°C / s to 0.2°C / s within 500s-570s; finally, cooling at a rate of 15°C every 55s-60s until the sintering preparation time is over.

[0022] The beneficial effects of the present invention are as follows: the present invention provides a support assembly and a support ring, and the support assembly and the support ring are interference connected after heat treatment, so that when one of the components is damaged, it can be replaced in time; the pressure block, the sealing column and the support ring are composed of different materials, and the components of different materials will not break at one time when performing high-pressure work, which increases the high toughness and wear resistance of the top hammer, can reduce the external impact damage in the "blasting" accident, and increase the life of the top hammer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the composite cemented carbide top hammer of the present invention;

[0024] Figure 2 It is a top view of the pressure-bearing block in the composite hard alloy anvil of the present invention;

[0025] Figure 3 It is a top view of the sealing column in the composite hard alloy top hammer of the present invention.

[0026] In the figure, 1. support assembly, 2. support ring, 3. sealing column, 4. pressure block, 5. first cut angle, 6. second cut angle, 7. third cut angle, 8. chamfer. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The present invention discloses a composite hard alloy top hammer, such as Figure 1 As shown, the structure of the composite cemented carbide top hammer is as follows: it includes a support assembly 1 in the form of a column, the support assembly 1 is covered with a support ring 2, the support assembly 1 includes a pressure block 4 and a hollow sealing column 3, the sealing column 3 is sleeved with the pressure block 4, the sealing column 3 is sleeved with the support ring 2, and the sealing column 3 is located between the pressure block 4 and the support ring 2;

[0029] The materials of the composite carbide top hammer are as follows: the pressure block 4 is composed of tungsten-cobalt alloy, reinforcing phase silicon carbide, boron carbide and graphene composite powder, the sealing column 3 is composed of steel powder, copper powder, aluminum powder and titanium powder; the support ring 2 is nickel-containing alloy steel.

[0030] One end surface of the support ring 2 is provided with a first cut corner 5 along the circumferential direction, the end surface of the sealing column 3 close to the first cut corner 5 is provided with a second cut corner 6 along the circumferential direction, and the end surface of the pressure block 4 close to the second cut corner 6 is provided with a third cut corner 7. Figure 2 shown.

[0031] The third cut corner 7 is provided with a chamfer 8 near the second cut corner 6 .

[0032] The included angle between the second cutting angle 6 and the axis of the sealing column 3 is equal to the included angle between the first cutting angle 5 and the axis of the sealing column 3; the included angle between the third cutting angle 7 and the axis of the sealing column 3 is not less than the included angle between the second cutting angle 6 and the axis of the sealing column 3; the first cutting angle 5 and the second cutting angle 6 are located on the same straight line, such as Figure 3 shown.

[0033] The components in the pressure block 4 are calculated by weight and specifically include: 7 to 9 parts of tungsten-cobalt alloy, 0.5 to 1.0 parts of reinforcing phase silicon carbide, 0.3 to 1.0 parts of boron carbide and 0.2 to 1.0 parts of graphene composite powder.

[0034] The components in the sealing column 3 are calculated by weight and specifically include: 8 to 8.2 parts of steel powder, 1.1 to 1.2 parts of copper powder, 0.15 to 0.2 parts of aluminum powder and 0.2 to 0.3 parts of titanium powder.

[0035] The preparation method of the support component in the composite carbide top hammer uses the composite carbide top hammer. The specific operation steps are as follows:

[0036] Step 1, weigh the materials required for the pressure-bearing block and the sealing column in the support assembly respectively according to mass parts to obtain the pressure-bearing block and the sealing column prepared materials;

[0037] Step 2, the pressure block material and alcohol are mixed in a ratio of 1:0.15-0.25 and put into a first ball mill, and the sealing column material and alcohol are mixed in a ratio of 1:0.15-0.25 and put into a second ball mill, and both are ball-milled in an inert gas at 30°C±3°C for 20h-35h to obtain a first ball-milled powder and a second ball-milled powder;

[0038] Step 3, respectively introducing the first ball-milled powder and the second ball-milled powder into different molds, and pressing them by cold pressing for 1350s to 1490s to obtain a preform;

[0039] Step 4, placing the blank into a vacuum sintering furnace for firing to obtain a cemented carbide;

[0040] Step 5: Grind and polish the cemented carbide to obtain a support component.

[0041] The specific pressure changes during the cold pressing treatment in step 3 are as follows: the pressure is increased to 35MPa at 0.7MPa / s within 50s and maintained for 10s-15s; then the pressure is increased to the primary stage point of 59MPa; the pressure is increased to the secondary stage point of 117Mpa at 1.9MPa / s~2.5MPa / s within 23s-30s; the pressure is increased to the tertiary stage point of 131MPa at 0.56MPa / s~0.7MPa / s within 20-25s; within 600-700s, the pressure is increased to the maximum pressure value of 175MPa at 0.063MPa / s~0.0738MPa / s, and maintained for 500s; then the pressure is released at 1MPa / s-1.2MPa / s within 150s-170s to finally obtain the blank.

[0042] The specific process of firing in step 4 is: heating to a primary high temperature value of 1260°C at 3.5°C / s to 4.9°C / s within 255s-355s; heating to a secondary high temperature point of 1430°C at 1.5°C / s to 2.3°C / s within 75s-115s; cooling to 1320°C at 0.5 to 0.6°C / s within 175s-205s, then heating to 1400°C at 0.1°C / s to 0.2°C / s within 500s-570s; finally, cooling at a rate of 15°C every 55s-60s until the sintering preparation time is over.

[0043] Among them, the graphene composite powder is selected as a single-layer small particle size, with a sheet diameter of 1-6μm, a thickness of 1-4nm, and a carbon content greater than 98%; the tungsten-cobalt alloy grade is YG3X with a purity of 99.9% and a particle size ≥500 mesh, and the enhanced strong phase silicon carbide and boron carbide have a purity of 99.9% and a particle size ≥750 mesh; the nickel alloy steel material has a nickel content of ≤2%.

[0044] The inclination angle of the third cutting angle is 48°±0.5°> the inclination angle of the second cutting angle is 44°±1°=the inclination angle of the first cutting angle is 44°±1°.

[0045] Through the statistics of top hammer application scenario data, it is found that the top hammer hardness ≥91HRA has good pressure transmission performance and can better meet the needs of high-quality diamond growth. Similarly, the statistics of top hammer application scenario data show that the top hammer side material structure achieves hardness ≥85HRA and impact toughness ≥65ft-lb, which can achieve a better balance between maintaining pressure transmission support and coping with external impact stress, thereby extending the life of the top hammer.

[0046] In the six-sided top press for synthetic diamond synthesis, usually six top hammers form a regular hexahedral cavity, with a hexahedral pyrophyllite block placed inside. The six top hammers apply pressure to the hexahedral pyrophyllite block to form a diamond growth synthesis cavity. The sealing edge is a long wedge-shaped structure squeezed out from the gap between the top hammers when the top hammers squeeze the pyrophyllite block. The sealing edge seals the synthesis cavity. The anchor chain effect refers to the assembly chamfer that forms a holding force on the sealing edge like an anchor chain to prevent the sealing edge from falling off, thereby effectively achieving a sealing effect.

[0047] The support ring, sealing column and pressure block are all interference fitted after heat treatment. When one component is damaged, it can be replaced. The pressure block is made of tungsten-cobalt alloy powder with reinforcing phase materials such as silicon carbide and boron carbide as the base material through powder metallurgy to achieve its high hardness and excellent pressure transmission performance; the sealing column is made of GCr15SiMn steel powder, copper powder and aluminum powder as the main raw materials through powder metallurgy to achieve its high toughness and wear resistance. The chamfer set at the assembly of the pressure block and the sealing column realizes the mechanical anchor chain effect to improve the holding force of the talc sealing edge.

[0048] The composite carbide top hammer of the present invention can reduce the hammer consumption cost by replacing only the corresponding damaged parts when the top hammer is damaged; the high toughness and wear resistance design of the sealing column can reduce the external impact damage in the "blasting" accident and increase the life of the top hammer; the chamfer design and the realization of the anchor chain effect can improve the holding force of the top hammer on the talc sealing edge during the diamond synthesis process, reduce the risk of the sealing edge falling, and reduce the probability of "blasting" accidents.

[0049] Example 1

[0050] The present invention discloses a composite hard alloy top hammer, the structure of which is as follows: comprising a support assembly 1 in the form of a column, the support assembly 1 being covered with a support ring 2, the support assembly 1 comprising a pressure block 4 and a hollow sealing column 3, the sealing column 3 being sleeved with the pressure block 4, the sealing column 3 being sleeved with the support ring 2, and the sealing column 3 being located between the pressure block 4 and the support ring 2;

[0051] The materials of the composite carbide top hammer are as follows: the pressure block 4 is composed of tungsten-cobalt alloy, reinforcing phase silicon carbide, boron carbide and graphene composite powder, the sealing column 3 is composed of steel powder, copper powder, aluminum powder and titanium powder; the support ring 2 is nickel-containing alloy steel.

[0052] The components in the pressure block 4 are calculated by weight and specifically include: 7 parts of tungsten-cobalt alloy, 1.0 part of reinforcing phase silicon carbide, 1.0 part of boron carbide and 1.0 part of graphene composite powder.

[0053] The components in the sealing column 3 are calculated by weight and specifically include: 8 parts of steel powder, 1.1 parts of copper powder, 0.15 parts of aluminum powder and 0.2 parts of titanium powder.

[0054] The preparation method of the support component in the composite carbide top hammer uses the composite carbide top hammer. The specific operation steps are as follows:

[0055] Step 1, weigh the materials required for the pressure-bearing block and the sealing column in the support assembly respectively according to mass parts to obtain the pressure-bearing block and the sealing column prepared materials;

[0056] Step 2, the pressure block material and alcohol are mixed in a ratio of 1:0.15 and put into a first ball mill, and the sealing column material and alcohol are mixed in a ratio of 1:0.15 and put into a second ball mill, and both are ball-milled in an inert gas at 30° C. for 20 hours to obtain a first ball-milled powder and a second ball-milled powder;

[0057] Step 3, respectively introducing the first ball-milled powder and the second ball-milled powder into different molds, and pressing them for 1350 seconds by cold pressing to obtain a preform;

[0058] Step 4, placing the blank into a vacuum sintering furnace for firing to obtain a cemented carbide;

[0059] Step 5: Grind and polish the cemented carbide to obtain a support component.

[0060] Example 2

[0061] The present invention discloses a composite hard alloy top hammer, the structure of which is as follows: comprising a support assembly 1 in the form of a column, the support assembly 1 being covered with a support ring 2, the support assembly 1 comprising a pressure block 4 and a hollow sealing column 3, the sealing column 3 being sleeved with the pressure block 4, the sealing column 3 being sleeved with the support ring 2, and the sealing column 3 being located between the pressure block 4 and the support ring 2;

[0062] The materials of the composite carbide top hammer are as follows: the pressure block 4 is composed of tungsten-cobalt alloy, reinforcing phase silicon carbide, boron carbide and graphene composite powder, the sealing column 3 is composed of steel powder, copper powder, aluminum powder and titanium powder; the support ring 2 is nickel-containing alloy steel.

[0063] A first cut corner 5 is formed on one end face of the support ring 2 along the circumferential direction, a second cut corner 6 is formed on the end face of the sealing column 3 close to the first cut corner 5 along the circumferential direction, a third cut corner 7 is formed on the end face of the pressure block 4 close to the second cut corner 6, and a chamfer 8 is formed on the third cut corner 7 close to the second cut corner 6.

[0064] The components in the pressure block 4 are calculated by weight and specifically include: 9 parts of tungsten-cobalt alloy, 0.5 parts of reinforcing phase silicon carbide, 0.3 parts of boron carbide and 0.2 parts of graphene composite powder.

[0065] The components in the sealing column 3 are calculated by weight and specifically include: 8.2 parts of steel powder, 1.2 parts of copper powder, 0.2 parts of aluminum powder and 0.3 parts of titanium powder.

[0066] The preparation method of the support component in the composite carbide top hammer uses the composite carbide top hammer. The specific operation steps are as follows:

[0067] Step 1, weigh the materials required for the pressure-bearing block and the sealing column in the support assembly respectively according to mass parts to obtain the pressure-bearing block and the sealing column prepared materials;

[0068] Step 2, the pressure block material and alcohol are mixed in a ratio of 1:0.25 and put into a first ball mill, and the sealing column material and alcohol are mixed in a ratio of 1:0.25 and put into a second ball mill, and both are ball-milled in an inert gas at 27° C. for 35 hours to obtain a first ball-milled powder and a second ball-milled powder;

[0069] Step 3, respectively introducing the first ball-milled powder and the second ball-milled powder into different molds, and pressing for 1490 seconds by cold pressing to obtain a preform;

[0070] The specific pressure changes during the cold pressing treatment in step 3 are as follows: the pressure is increased to 35MPa at 0.7MPa / s within 50s and maintained for 10s; then the pressure is increased to the first stage point of 59MPa; the pressure is increased to the second stage point of 117Mpa at 1.9MPa / s within 23s; the pressure is increased to the third stage point of 131MPa at 0.7MPa / s within 20s; within 600s, the pressure is increased to the maximum pressure value of 175MPa at 0.063MPa / s, maintained for 500s; then the pressure is released at 1MPa / s within 150s to finally obtain the blank.

[0071] Step 4, placing the blank into a vacuum sintering furnace for firing to obtain a cemented carbide;

[0072] Step 5: Grind and polish the cemented carbide to obtain a support component.

[0073] The specific process of firing in step 4 is: heating to the first high temperature value of 1260°C at 3.5°C / s within 255s; heating to the second high temperature point of 1430°C at 1.5°C / s within 75s; cooling to 1320°C at 0.5°C / s within 175s, and then heating to 1400°C at 0.1°C / s within 500s; finally, cooling at a rate of 15°C every 55s until the sintering preparation time is over.

[0074] Example 3

[0075] The present invention discloses a composite hard alloy top hammer, the structure of which is as follows: comprising a support assembly 1 in the form of a column, the support assembly 1 being covered with a support ring 2, the support assembly 1 comprising a pressure block 4 and a hollow sealing column 3, the sealing column 3 being sleeved with the pressure block 4, the sealing column 3 being sleeved with the support ring 2, and the sealing column 3 being located between the pressure block 4 and the support ring 2;

[0076] The materials of the composite carbide top hammer are as follows: the pressure block 4 is composed of tungsten-cobalt alloy, reinforcing phase silicon carbide, boron carbide and graphene composite powder, the sealing column 3 is composed of steel powder, copper powder, aluminum powder and titanium powder; the support ring 2 is nickel-containing alloy steel.

[0077] A first cut corner 5 is formed on one end face of the support ring 2 along the circumferential direction, a second cut corner 6 is formed on the end face of the sealing column 3 close to the first cut corner 5 along the circumferential direction, a third cut corner 7 is formed on the end face of the pressure block 4 close to the second cut corner 6, and a chamfer 8 is formed on the third cut corner 7 close to the second cut corner 6.

[0078] The angle between the second cutting angle 6 and the axis of the sealing column 3 is equal to the angle between the first cutting angle 5 and the axis of the sealing column 3; the angle between the third cutting angle 7 and the axis of the sealing column 3 is not less than the angle between the second cutting angle 6 and the axis of the sealing column 3; the first cutting angle 5 and the second cutting angle 6 are located on the same straight line.

[0079] The components in the pressure block 4 are calculated by weight and specifically include: 8 parts of tungsten-cobalt alloy, 0.6 parts of reinforcing phase silicon carbide, 0.7 parts of boron carbide and 0.5 parts of graphene composite powder.

[0080] The components in the sealing column 3 are calculated by weight and specifically include: 8.1 parts of steel powder, 1.15 parts of copper powder, 0.18 parts of aluminum powder and 0.25 parts of titanium powder.

[0081] The preparation method of the support component in the composite carbide top hammer uses the composite carbide top hammer. The specific operation steps are as follows:

[0082] Step 1, weigh the materials required for the pressure-bearing block and the sealing column in the support assembly respectively according to mass parts to obtain the pressure-bearing block and the sealing column prepared materials;

[0083] Step 2, the pressure block material and alcohol are mixed in a ratio of 1:0.2 and put into a first ball mill, and the sealing column material and alcohol are mixed in a ratio of 1:0.2 and put into a second ball mill, and both are ball-milled in an inert gas at 33° C. for 30 hours to obtain a first ball-milled powder and a second ball-milled powder;

[0084] Step 3, respectively introducing the first ball-milled powder and the second ball-milled powder into different molds, and pressing for 1380 seconds by cold pressing to obtain a preform;

[0085] The specific pressure changes during the cold pressing treatment in step 3 are as follows: the pressure is increased to 35MPa at 0.7MPa / s within 50s and maintained for 15s; then the pressure is increased to the first stage point of 59MPa; the pressure is increased to the second stage point of 117Mpa at 2.5MPa / s within 30s; the pressure is increased to the third stage point of 131MPa at 0.56MPa / s within 25s; within 700s, the pressure is increased to the maximum pressure value of 175MPa at 0.0738MPa / s, and maintained for 500s; then the pressure is released at 1.2MPa / s within 170s to finally obtain the blank.

[0086] Step 4, placing the blank into a vacuum sintering furnace for firing to obtain a cemented carbide;

[0087] The specific process of firing in step 4 is: heating to the first high temperature value of 1260°C at 4.9°C / s within 355s; heating to the second high temperature point of 1430°C at 2.3°C / s within 115s; cooling to 1320°C at 0.6°C / s within 205s, and then heating to 1400°C at 0.2°C / s in 570s; finally, cooling at a rate of 15°C every 60s until the sintering preparation time is over.

[0088] Step 5: Grind and polish the cemented carbide to obtain the support assembly described in claim 1.

[0089] Example 4

[0090] The present invention discloses a composite hard alloy top hammer, the structure of which is as follows: comprising a support assembly 1 in the form of a column, the support assembly 1 being covered with a support ring 2, the support assembly 1 comprising a pressure block 4 and a hollow sealing column 3, the sealing column 3 being sleeved with the pressure block 4, the sealing column 3 being sleeved with the support ring 2, and the sealing column 3 being located between the pressure block 4 and the support ring 2;

[0091] The materials of the composite carbide top hammer are as follows: the pressure block 4 is composed of tungsten-cobalt alloy, reinforcing phase silicon carbide, boron carbide and graphene composite powder, the sealing column 3 is composed of steel powder, copper powder, aluminum powder and titanium powder; the support ring 2 is nickel-containing alloy steel.

[0092] A first cut corner 5 is formed on one end face of the support ring 2 along the circumferential direction, a second cut corner 6 is formed on the end face of the sealing column 3 close to the first cut corner 5 along the circumferential direction, a third cut corner 7 is formed on the end face of the pressure block 4 close to the second cut corner 6, and a chamfer 8 is formed on the third cut corner 7 close to the second cut corner 6.

[0093] The angle between the second cutting angle 6 and the axis of the sealing column 3 is equal to the angle between the first cutting angle 5 and the axis of the sealing column 3; the angle between the third cutting angle 7 and the axis of the sealing column 3 is not less than the angle between the second cutting angle 6 and the axis of the sealing column 3; the first cutting angle 5 and the second cutting angle 6 are located on the same straight line.

[0094] The components in the pressure block 4 are calculated by weight and specifically include: 9 parts of tungsten-cobalt alloy, 1.0 parts of reinforcing phase silicon carbide, 0.7 parts of boron carbide and 0.8 parts of graphene composite powder.

[0095] The components in the sealing column 3 are calculated by weight and specifically include: 8 parts of steel powder, 1.1 parts of copper powder, 0.19 parts of aluminum powder and 0.3 parts of titanium powder.

[0096] The preparation method of the support component in the composite carbide top hammer uses the composite carbide top hammer. The specific operation steps are as follows:

[0097] Step 1, weigh the materials required for the pressure-bearing block and the sealing column in the support assembly respectively according to mass parts to obtain the pressure-bearing block and the sealing column prepared materials;

[0098] Step 2, the pressure block material and alcohol are mixed in a ratio of 1:0.19 and put into a first ball mill, and the sealing column material and alcohol are mixed in a ratio of 1:0.23 and put into a second ball mill, and both are ball-milled in an inert gas at 31° C. for 25 hours to obtain a first ball-milled powder and a second ball-milled powder;

[0099] Step 3, respectively introducing the first ball-milled powder and the second ball-milled powder into different molds, and pressing for 1420 seconds by cold pressing to obtain a preform;

[0100] The specific pressure changes during the cold pressing treatment in step 3 are as follows: the pressure is increased to 35MPa at 0.7MPa / s within 50s and maintained for 13s; then the pressure is increased to the first stage point of 59MPa; the pressure is increased to the second stage point of 117Mpa at 2.2MPa / s within 24s; the pressure is increased to the third stage point of 131MPa at 0.64MPa / s within 23s; within 653s, the pressure is increased to the maximum pressure value of 175MPa at 0.0712MPa / s, and maintained for 500s; then the pressure is released at 1.1MPa / s within 165s to finally obtain the blank.

[0101] Step 4, placing the blank into a vacuum sintering furnace for firing to obtain a cemented carbide;

[0102] The specific process of firing in step 4 is: heating to the first high temperature value of 1260°C at 4°C / s within 300s; heating to the second high temperature point of 1430°C at 2°C / s within 100s; cooling to 1320°C at 0.56°C / s within 195s, and then heating to 1400°C at 0.15°C / s in 540s; finally, cooling at a rate of 15°C every 57s until the sintering preparation time is over.

[0103] Step 5: Grind and polish the cemented carbide to obtain a support component.

Claims

1. Composite carbide top hammer, characterized in that: The structure of the composite hard alloy top hammer is as follows: it comprises a support assembly (1) in the form of a column, the support assembly (1) is covered with a support ring (2), the support assembly (1) comprises a pressure block (4) and a hollow sealing column (3), the sealing column (3) is sleeved with the pressure block (4), the sealing column (3) is sleeved with the support ring (2), and the sealing column (3) is located between the pressure block (4) and the support ring (2); The materials of the composite hard alloy top hammer are as follows: the pressure block (4) is composed of tungsten-cobalt alloy, reinforcing phase silicon carbide, boron carbide and graphene composite powder; the sealing column (3) is composed of steel powder, copper powder, aluminum powder and titanium powder; and the support ring (2) is nickel-containing alloy steel.

2. The composite carbide top hammer according to claim 1, characterized in that: One end face of the support ring (2) is provided with a first cut angle (5) along the circumferential direction, the end face of the sealing column (3) close to the first cut angle (5) is provided with a second cut angle (6) along the circumferential direction, and the end face of the pressure block (4) close to the second cut angle (6) is provided with a third cut angle (7).

3. The composite carbide top hammer according to claim 2, characterized in that: The third cut corner (7) is provided with a chamfer (8) near the second cut corner (6).

4. The composite cemented carbide top hammer according to claim 3, characterized in that: The angle between the second cutting angle (6) and the axis of the sealing column (3) is equal to the angle between the first cutting angle (5) and the axis of the sealing column (3); the angle between the third cutting angle (7) and the axis of the sealing column (3) is not less than the angle between the second cutting angle (6) and the axis of the sealing column (3); and the first cutting angle (5) and the second cutting angle (6) are located on the same straight line.

5. The composite cemented carbide top hammer according to claim 4, characterized in that: The components in the pressure block (4) are specifically composed of 7 to 9 parts by mass of tungsten-cobalt alloy, 0.5 to 1.0 parts of reinforcing phase silicon carbide, 0.3 to 1.0 parts of boron carbide and 0.2 to 1.0 parts of graphene composite powder.

6. The composite cemented carbide top hammer according to claim 5, characterized in that: The components in the sealing column (3) are calculated by weight and specifically include: 8 to 8.2 parts of steel powder, 1.1 to 1.2 parts of copper powder, 0.15 to 0.2 parts of aluminum powder and 0.2 to 0.3 parts of titanium powder.

7. A method for preparing a supporting component in a composite cemented carbide top hammer, characterized in that: Using the composite carbide top hammer described in claim 6, the specific operating steps are as follows: Step 1, weigh the materials required for the pressure-bearing block and the sealing column in the support assembly respectively according to mass parts to obtain the pressure-bearing block and the sealing column prepared materials; Step 2, the pressure block material and alcohol are mixed in a ratio of 1:0.15-0.25 and put into a first ball mill, and the sealing column material and alcohol are mixed in a ratio of 1:0.15-0.25 and put into a second ball mill, and both are ball-milled in an inert gas at 30°C±3°C for 20h-35h to obtain a first ball-milled powder and a second ball-milled powder; Step 3, respectively introducing the first ball-milled powder and the second ball-milled powder into different molds, and pressing them by cold pressing for 1350s to 1490s to obtain a preform; Step 4, placing the blank into a vacuum sintering furnace for firing to obtain a cemented carbide; Step 5: Grind and polish the cemented carbide to obtain the support assembly described in claim 1.

8. The method for preparing the supporting assembly in the composite cemented carbide top hammer according to claim 7, characterized in that: The pressure changes during the cold pressing treatment in step 3 are specifically as follows: the pressure is increased to 35MPa at 0.7MPa / s within 50s and maintained for 10s-15s; then the pressure is increased to the primary stage point of 59MPa; the pressure is increased to the secondary stage point of 117Mpa at 1.9MPa / s~2.5MPa / s within 23s-30s; the pressure is increased to the tertiary stage point of 131MPa at 0.56MPa / s~0.7MPa / s within 20-25s; within 600s-700s, the pressure is increased to the maximum pressure value of 175MPa at 0.063MPa / s~0.0738MPa / s, and maintained for 500s; then the pressure is released at 1MPa / s-1.2MPa / s within 150s-170s to finally obtain the blank.

9. The method for preparing the supporting assembly in the composite cemented carbide top hammer according to claim 7, characterized in that: The specific process of firing in step 4 is: heating to a primary high temperature value of 1260°C at 3.5°C / s to 4.9°C / s within 255s-355s; heating to a secondary high temperature point of 1430°C at 1.5°C / s to 2.3°C / s within 75s-115s; cooling to 1320°C at 0.5°C / s to 0.6°C / s within 175s-205s, then heating to 1400°C at 0.1°C / s to 0.2°C / s within 500s-570s; finally, cooling at a rate of 15°C every 55s-60s until the sintering preparation time is over.

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