Assembly type composite holding-up hammer

Abstract

The utility model relates to the technical field of holding-up hammers, in particular to an assembly type composite holding-up hammer which comprises a hammer core, the hammer core is in a cone shape, the upper portion of the hammer core is provided with a working portion in a rectangular pyramid shape, and the lower portion of the hammer core is provided with a protruding portion. The shell comprises a first shell body and a second shell body, the first shell body and the second shell body are detachably connected to form a cavity for containing the hammer core, the first shell body is matched with the conical outer surface of the hammer core, the second shell body is matched with the protruding part of the hammer core, and through the design of the hammer core and the shell, the pressure bearing performance of the holding-up hammer is improved; the service life of the hammer core is prolonged, and the production and operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to an assembled composite anvil, belonging to the technical field of anvils. Background Art

[0002] Artificial diamond is formed by changing the lattice structure of graphite under high temperature and high pressure. It is a functional material widely used in cutting-edge fields such as aerospace, high-end medical care, and power electronics. According to statistics, China's diamond production accounts for more than 90% of the world's total, but its quality is still mid-to-low-end internationally, and there is still a certain gap compared with foreign artificial diamond grades. The hinged six-sided top press is the main equipment for synthesizing diamonds made of superhard materials with independent intellectual property rights in my country. It has the advantages of low equipment cost, simple operation, and low production cost. It is the mainstream equipment for domestic artificial diamond manufacturing. Currently, China has more than 10,000 presses used to manufacture industrial diamonds and cultured diamonds.

[0003] In the process of producing artificial diamonds by a six-sided top press, the top hammer, as a key component, is in direct contact with the synthetic block and withstands ultra-high pressure. The material of the top hammer is currently generally tungsten carbide, which has high compressive strength but very poor toughness. Under repeated ultra-high pressure and high temperature alternating load working conditions, it is very easy to produce micro cracks. After the micro cracks expand and grow (that is, after the top hammer has worked a certain number of times), the top hammer will fail and be scrapped. Another situation in which the top hammer is scrapped is the high-pressure leakage of the sealing medium in the diamond synthesis process (that is, "blasting"). Due to the poor toughness of the top hammer, the micro cracks expand rapidly in a short period of time, which is reflected at the macro level as the top hammer breaking and being scrapped;

[0004] Therefore, carbide top hammers are the main consumable parts in the daily production process of the superhard materials industry. Reducing the hammer consumption per unit diamond production and the convenience of disassembly and assembly will directly lead to reduced production costs, improved product competitiveness, and improved work efficiency. This is also the main goal pursued by diamond manufacturers. Utility Model Content

[0005] The utility model aims to solve the deficiencies in the prior art and provides an assembled composite top hammer.

[0006] The technical solution of the utility model for solving the above-mentioned technical problems is as follows: an assembled composite top hammer, comprising: a hammer core, which is conical in shape, with a quadrangular pyramid-shaped working part provided on its upper part and a protrusion provided on its lower part; an outer shell, which comprises a first shell and a second shell, the first shell and the second shell being detachably connected to form a cavity for accommodating the hammer core, the first shell being matched with the conical outer surface of the hammer core, and the second shell being matched with the protrusion.

[0007] Furthermore, a protruding matching portion is provided on the top surface of the second shell, and the first shell is sleeved on the matching portion.

[0008] Furthermore, the matching portion is interference fit with the first shell.

[0009] Furthermore, the matching portion and the protruding portion are in surface contact.

[0010] Furthermore, the maximum height H1 of the matching portion is 1.5-1.8 times the maximum vertical height H2 of the plane where the protrusion is connected to the side wall of the hammer core.

[0011] Furthermore, the protrusion is an outward-facing cone with a cross section consisting of two straight lines, or an outward-facing protrusion with a cross section consisting of an arc line.

[0012] Furthermore, the angle α between the line connecting the connection point of the protrusion and the side wall of the hammer core and the midpoint of the protrusion and the plane where the top surface of the working part is located is 3-18 degrees; the vertical distance L1 between the connection point of the protrusion and the side wall and the top surface of the working part is 1.0-1.7 times the side length L of the top surface of the tetrahedral pyramid of the working part.

[0013] Furthermore, the side wall of the first shell has a first inclination angle β1 from the inside to the outside, the hammer core has a second inclination angle β2, and the absolute value of the difference between the second inclination angle and the first inclination angle is not greater than 10'.

[0014] Furthermore, the minimum thickness of the side wall of the first shell is 0.08-0.25 times the side length L of the top surface of the quadrangular pyramid of the working part.

[0015] Furthermore, the hammer core is made of cemented carbide, and the first shell and the second shell are both made of high-strength steel.

[0016] The beneficial effects of the utility model are:

[0017] (1) By setting a structure in which the fixing part and the supporting part are detachably connected, when metal fatigue occurs and replacement is required, only the damaged part needs to be replaced separately, without having to replace the entire shell, thus avoiding material waste and reducing production and operation costs;

[0018] (2) The composite top hammer is made by covering the hammer core with a shell, which can reduce the volume of the hammer core. The hammer core is usually made of cemented carbide, which is expensive and has a limited reuse cycle. Covering with a shell can reduce the amount of cemented carbide used, thereby reducing production and operating costs.

[0019] (3) By providing the protrusion, the middle portion of the hammer core has a larger volume, which increases the strength of the middle portion, thereby preventing the problem that the middle portion of the top surface of the working portion has low strength and cannot be used for larger loads, thereby extending the service life of the hammer core. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the composite top hammer structure provided by an embodiment of the present utility model;

[0021] Figure 2 A front view of the hammer core provided by an embodiment of the present utility model;

[0022] Figure 3 A cross-sectional view of a housing provided by an embodiment of the present utility model;

[0023] Figure 4 A cross-sectional view of a second housing provided by an embodiment of the present utility model;

[0024] Figure 5 A front view of another hammer core provided by an embodiment of the present utility model;

[0025] Figure 6 This is another cross-sectional view of a housing provided by an embodiment of the present utility model.

[0026] Reference numerals:

[0027] 1. Hammer core; 11. Protrusion; 12. Working part; 2. Housing; 21. First shell; 22. Second shell; 221. Fitting part. DETAILED DESCRIPTION

[0028] The following is a detailed description of the specific embodiments of the present invention. The present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used are only for describing specific embodiments and are not intended to limit the present invention.

[0030] like Figure 1 and 2As shown, the utility model provides an assembled composite top hammer, including a hammer core 1, the hammer core 1 is conical, the upper part of the hammer core 1 is a quadrangular pyramid-shaped working part 12 rising from the outside to the inside, the lower part of the hammer core 1 is integrally formed with a protrusion 11 coaxial with the hammer core 1, the "upper part" referred to above is the end close to the compression medium, and the "lower part" is the end close to the six-sided top press, the outer shell 2, the outer shell 2 includes a first shell 21 and a second shell 22, the first shell 21 and the second shell 22 are detachably connected to form a cavity for accommodating the hammer core 1, the first shell 21 cooperates with the conical outer surface of the hammer core 1, and preferably the first shell 21 and the conical outer surface of the hammer core 1 are interference fit, the interference fit can fix the hammer core 1, and is conducive to stress transfer, the second shell 22 protrudes from the hammer core 1 Part 11 is matched, here preferably the second shell 22 is in contact with the protruding part 11 of the hammer core 1, preferably, the hammer core 1 is made of cemented carbide, such as tungsten carbide cemented carbide, and the shell 2 is made of high-strength steel. During use, the high-strength steel material used in the shell 2 has a certain plastic deformation relative to the cemented carbide material, which can coordinate the extremely small errors generated during the assembly process. When the hammer core 1 is sealed with other hammer cores 1 during use, the force is uneven, which reduces the impact of uneven force on the service life of the hammer core 1. It should be pointed out that the high-strength steel used in the shell 2 can be carbon steel, alloy steel, or carbon steel or alloy steel that has been tempered or annealed, etc., as long as it meets the corresponding tensile strength. The embodiment of the utility model preferably uses high-strength alloy steel; the shell 2 can also use high-strength and high-toughness ceramics.

[0031] First, during the operation of the six-sided top press, the shell 2 will be subjected to compressive stress from the hammer core 1. Although the thickness of the shell 2 set at the factory can withstand the corresponding compressive stress, metal fatigue will inevitably occur over time. In order to ensure the compactness of the overall structure and the coordination of the size of the shell 2 and the hammer core 1, the thickness of the shell 2 will not be set too thick. By setting the first shell 21 and the second shell 22 to be detachably connected, when metal fatigue occurs and needs to be replaced, it is only necessary to replace them separately according to the damaged position, and there is no need to replace the shell 2 as a whole, thus avoiding material waste and reducing production and operation costs. Secondly, the shell 2 is used to cover the hammer core 1 to form a composite top hammer, which can reduce the volume of the hammer core 1. The hammer core 1 is usually made of cemented carbide, which is expensive and has a limited reuse cycle. The shell 2 is used to cover it, which can reduce the use of cemented carbide and reduce production and operation costs. In addition, by setting the protrusion 11, the volume of the middle part of the hammer core 1 is larger, which increases the strength of the middle part, prevents the problem that the strength of the middle part of the top surface of the working part 12 is low and cannot be used for larger loads, and extends the service life of the hammer core 1.

[0032] Specifically, such as Figure 3 and Figure 4As shown, the top surface of the second shell 22 is provided with a protruding matching portion 221, and the matching portion 221 is integrally formed and connected with the second shell 22 or is an integral structure formed by processing. The top surface of the matching portion 221 is provided with a recess adapted to the protrusion 11. It should be pointed out that after the protrusion is adapted to be installed in place on the matching portion, the matching portion is used to provide good support for the protrusion. In the actual processing process, the protrusion and the matching portion are allowed to have a certain error. The protrusion and the matching portion have a certain deformation under external pressure to coordinate the matching gap caused by the error; the first shell 21 is sleeved on the matching portion 221, and at this time the bottom surface of the first shell 21 abuts against the top surface of the second shell 22; the first shell 21 and the second shell 22 can also be detachably connected in the following way, such as Figure 6 As shown, the first shell 21 has a mounting surface that is interference fit with the outer surface of the second shell 22, and the second shell 22 is embedded in the lower part of the first shell 21. The utility model preferably provides a protruding matching portion 221 on the top surface of the second shell 22. Because the matching portion 221 is provided, the bottom surface of the first shell 21 abuts against the top surface of the second shell 22. The second shell 22 can bear part of the stress, reduce the force on the first shell 21 during operation, and help to extend the service life of the first shell 21.

[0033] Specifically, the side surface of the matching portion 221 is interference-fitted with the first shell 21. The interference fit can not only achieve fixation between the first shell 21 and the second shell 22, thereby improving stability during operation, but also facilitate uniform stress distribution.

[0034] Specifically, the matching portion 221 and the protruding portion 11 are in surface contact. Surface contact can effectively avoid the occurrence of local stress concentration at the contact point between the matching portion 221 and the protruding portion 11, which is beneficial to uniform stress distribution and further extends the service life of the hammer core 1 and the second shell 22.

[0035] Specifically, the maximum height H1 of the matching portion 221 is 1.5-1.8 times the maximum vertical height H2 of the plane from the protrusion 11 to the connection point between the protrusion 11 and the side wall of the hammer core 1. If the height ratio is less than 1.5 times, when subjected to a large load, the connection between the matching portion 221 and the first shell 21 cannot provide sufficient supporting force, which can easily cause damage to the first shell 21. If the height ratio is greater than 1.8 times, the supporting force is excessive, the thickness of the second shell 22 is too thick, resulting in a loose structure and an excessive increase in the use of high-strength steel, thereby increasing production and operating costs.

[0036] Specifically, the protrusion 11 is an outward-facing cone with two straight lines in cross section or an outward-facing protrusion with an arc in cross section. Through the above arrangement, the protrusion 11 exerts a certain outward squeezing force on the matching portion 221. As a reaction force, the matching portion 221 generates pressure on the protrusion 11 toward the working portion 12, so that the area where the top hammer is subjected to the maximum force is similar to a spherical area just below the top plane, and the force on the periphery of the hammer core 1 is relatively small, thereby extending the service life of the hammer core 1. Figure 2 As shown, when the protrusion 11 is an outward protrusion with an arc cross section, although the mass of the hammer core 1 is increased to a certain extent, the strengthening capacity of the middle area of the hammer core 1 is increased, and the arc-shaped structure can reduce the stress concentration caused by the boundary effect and avoid local damage caused by stress concentration; Figure 5 As shown, when the protrusion 11 is an outward-facing cone formed by two straight lines in cross section, the hammer core 1 has the minimum mass while ensuring the strength of the middle part, and the manufacturing cost is reduced.

[0037] Specifically, the angle α between the connection point of the protrusion 11 and the side wall of the hammer core 1 and the line connecting the midpoint of the protrusion 11 and the plane where the top surface of the working part 12 is located is 3-18 degrees; the vertical distance L1 between the connection point of the protrusion 11 and the side wall and the top surface of the working part 12 is 1.0-1.7 times the side length L of the top surface of the quadrangular pyramid. Through the above definition, it is further ensured that the area where the top hammer is subjected to the maximum force is directly below the top plane and is similar to a spherical area directly below the corresponding inclined surface of the working part 12, further avoiding the pressure applied by the hammer core 1 on the shell 2 being greater than the local pressure of the shell 2, resulting in failure.

[0038] Specifically, the side wall of the first shell 21 has a first inclination angle β1 from the inside to the outside, and the magnitude of the first inclination angle β1 is between 1-2 degrees. The hammer core 1 has a second inclination angle β2, and the absolute value of the difference between the second inclination angle and the first inclination angle is not greater than 10'. During the assembly process, the assembly size affects the stress distribution of the shell 2. If the difference between the second inclination angle β2 and the first inclination angle β1 is greater than 10', the hammer core 1 has a larger compressive stress on the outside of the first shell 21. When the composite top hammer is assembled to the base of the six-sided top press, there is a certain probability that the local stress in the shell 2 will be greater than the tensile strength at that location, so that the shell 2 cannot coordinate the deformation of the hammer core 1 during operation, affecting the service life of the top hammer. It should be pointed out that the first inclination angle β1 and the second inclination angle β2 are respectively the angles between the shell 2 or the hammer core 1 and its axis.

[0039] Specifically, the minimum thickness of the side wall of the first shell 21 is 0.08-0.25 times the side length of the top surface of the quadrangular pyramid of the working part 12. By limiting the above dimensions, the following effects are achieved: the first shell 21 has a certain thickness, so that after the composite top hammer is installed, the first shell 21 can bear the compressive stress generated during the operation of the hammer core 1, thereby avoiding fatigue damage to the first shell 21. Secondly, the thickness should not be too large. If the thickness is too large, firstly, the material at the bottom of the shell will creep during long-term use, resulting in the material at the bottom of the outer shell 2 having a tendency to flow outward through the side wall of the first shell 21, affecting the accuracy of the composite top hammer during subsequent use. Secondly, excessive thickness will lead to a non-compact structure and will also excessively increase the use of high-strength steel, thereby increasing production and operation costs.

[0040] The technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all fall within the scope of protection of the utility model. The scope of protection of the utility model shall be based on the attached claims.

Claims

1. An assembled composite top hammer, characterized in that: include: The hammer core is cone-shaped, with a quadrangular pyramid-shaped working portion provided on the upper portion and a protruding portion provided on the lower portion; The shell includes a first shell and a second shell, the first shell and the second shell are detachably connected to form a cavity for accommodating the hammer core, the first shell cooperates with the conical outer surface of the hammer core, and the second shell cooperates with the protrusion.

2. The assembled composite top hammer according to claim 1, characterized in that: The top surface of the second shell is provided with a protruding matching portion, and the first shell is sleeved on the matching portion.

3. The assembled composite top hammer according to claim 2, characterized in that: The matching portion is interference-fitted with the first housing.

4. The assembled composite top hammer according to claim 3, characterized in that: The matching portion is in surface contact with the protruding portion.

5. The assembled composite top hammer according to claim 4, characterized in that: The maximum height H1 of the matching portion is 1.5-1.8 times the maximum vertical height H2 of the plane where the protrusion is connected to the protrusion and the side wall of the hammer core.

6. The assembled composite top hammer according to claim 1, characterized in that: The protrusion is a cone with a cross section consisting of two straight lines facing outwards, or a protrusion with a cross section consisting of an arc line facing outwards.

7. The assembled composite top hammer according to claim 6, characterized in that: The angle α between the line connecting the connection point of the protrusion and the side wall of the hammer core and the midpoint of the protrusion and the plane where the top surface of the working part is located is 3-18 degrees; the vertical distance L1 between the connection point of the protrusion and the side wall and the top surface of the working part is 1.0-1.7 times the side length L of the top surface of the quadrangular pyramid of the working part.

8. The assembled composite top hammer according to claim 1, characterized in that: The side wall of the first shell has a first inclination angle β1 from inside to outside, and the hammer core has a second inclination angle β2. The absolute value of the difference between the second inclination angle and the first inclination angle is not greater than 10'.

9. The assembled composite top hammer according to claim 1, characterized in that: The minimum thickness of the side wall of the first shell is 0.08-0.25 times the side length L of the top surface of the quadrangular pyramid of the working part.

10. The assembled composite top hammer according to claim 1, characterized in that: The hammer core is made of cemented carbide, and the first shell and the second shell are both made of high-strength steel.

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