Production method of diamond compact anchor rod drill body for coal mine

Abstract

The invention discloses a production method of a diamond compact anchor rod drill body for a coal mine, and belongs to the technical field of drill body machining. A production method of a diamond compact anchor rod drill body for a coal mine comprises the following steps of blank forging, turning, outer circle forming, water hole forming, grooving, powder discharging groove milling, threading, piece nest front inclined face machining, inclined face machining of the front end of the drill body, and machining of a piece nest front inclined face used for installing a diamond compact. Milling a piece nest: accurately processing the piece nest for mounting the diamond compact on the drill body; milling a back angle: processing necessary angles and shapes on the back of the drill body so as to improve the stability of the drill body and reduce the drilling resistance; and round head machining is carried out on the head of the drill body, so that the drill body has better guidance quality and machining effect. According to the invention, the process flow is more perfect and standardized and is simple and clear by reducing the residual link in the process flow, the working intensity of operators is reduced, the production efficiency is improved, and the daily output is increased by dozens of times.

Description

Technical Field

[0001] The invention relates to the technical field of drill body processing, and more specifically to a method for producing a diamond composite sheet anchor drill body for coal mines. Background Art

[0002] With the promotion of anchor support technology in the coal mining industry, anchor drill bits are also more widely used in the coal mining industry. Diamond composite sheets have been widely used in oil drilling, geological exploration, mining engineering and other fields due to their excellent wear resistance, hardness and impact resistance. Diamond composite sheets are widely used as cutting teeth in anchor drill bits with their high wear resistance and good impact resistance. The drill bits have the characteristics of long life and high efficiency in soft, medium and hard rock formations. As an important tool in these fields, the performance of diamond composite anchor drill bits directly affects drilling efficiency, drilling quality and cost-effectiveness.

[0003] Diamond composite anchor drill body is a key component for mining drilling. Its processing quality directly affects the drilling efficiency and the service life of the drill bit. The traditional production process of diamond composite anchor drill body often faces problems such as low production efficiency, high energy consumption, and unstable product quality. The main reason is that the process design is unreasonable, there are a large number of manual operation links and repeated operations, resulting in a long production cycle and low production efficiency. In view of this, we propose a production method for diamond composite anchor drill body for coal mines. Summary of the invention

[0004] The purpose of the present invention is to provide a method for producing a diamond composite sheet anchor drill body for coal mines, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for producing a diamond composite anchor drill body for coal mines comprises the following steps:

[0007] Forging blank: the basic shape and size of the drill body blank are formed through forging process, and the blank reserves machining allowance;

[0008] Turning - outer circle - water hole, turning processing is performed on the blank, the outer circle size of the drill body is accurately controlled, and the water hole is processed at the specified position;

[0009] Thread rolling: rolling is performed on one end of the drill body to form a thread structure that meets the requirements for connecting or fixing other components;

[0010] Slotting: Open necessary slots on the drill body to meet usage requirements;

[0011] Milling powder groove: The powder groove is machined on the drill body through milling process to remove rock powder generated during the drilling process of the finished drill bit and keep the hole clean;

[0012] Threading, removing burrs produced by machining on the drill body;

[0013] The front bevel of the piece nest is processed by bevel processing on the front end of the drill body to form the front bevel of the piece nest for installing the diamond composite piece. The angle of the front bevel of the piece nest is 18-39 degrees.

[0014] Milling the slot, accurately machining the slot for installing the diamond composite sheet on the drill body, ensuring that the size and shape of the slot match the diamond composite sheet, and after milling the slot, the side above the slot is a 0-15 degree slope, and the side below the slot is a 18-39 degree slope;

[0015] Milling back angle, processing the necessary angle and shape on the back of the drill body to improve the stability of the drill body and reduce drilling resistance;

[0016] Round head: The head of the drill body is rounded to make the drill body have better guidance and processing effect.

[0017] Preferably, the outer diameter tolerance of the outer circular water hole is between ±0.01mm and the length tolerance is between ±0.02mm. For metric buckles, the water holes of coarse buckles are drilled with a 4.8mm drill bit, and for imperial buckles, the water holes are drilled with a 3.8mm drill bit.

[0018] Preferably, before thread rolling, the outer diameter, length and outer diameter of the drill body and the threaded part need to be checked, and thread rolling can be started after they are qualified.

[0019] Preferably, when slotting, the slot depth of each model body is 14mm, the slot width of the φ32 body is 7mm, and the width of the body below φ32 is 5mm, the slot depth tolerance is 0.1mm, and the width tolerance of the two wings after slotting is 0.1mm.

[0020] Preferably, the sum of the thickness of the two sides of the water hole of the drill body is 8 mm, with a tolerance of 0.05 mm;

[0021] At the threaded sink, the diagonal distance for metric buttons is 11mm, for imperial buttons is 10mm, for coarse buttons is 12.5mm, and the tolerance is -0.1mm.

[0022] Preferably, when processing the front bevel of the sheet nest, first adjust the tooling elevation angle and then adjust the positioning bolts to make the drill body clamped horizontally;

[0023] The milled intersection line is in line with the middle sink line to avoid forming a broken line with the sink.

[0024] Preferably, the depth of the sheet nest is 3.2 mm, and the depths of both sides of the sheet nest are kept level;

[0025] The height difference between the sheet and the nest is 0.1mm;

[0026] The depth and height tolerance of the two wing slots is required to be 0.15mm;

[0027] There should be no rounded corners or rounded edges at the inner corners of the slice nest.

[0028] Preferably, the thickness of both sides of the intersection of the milled upper top line of the back angle and the upper top line of the sheet nest is consistent, and the thickness is 0.2 mm.

[0029] Preferably, the arc line of the rounded drill body pocket is consistent with the outer circle of the diamond composite sheet;

[0030] The upper arc line on the outer side of the drill body extends backward and downward;

[0031] The thickness of the drill body at the top is 1 nm.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention improves and reduces the sedimentation links existing in the process flow, so that the process flow is more perfect and standardized, the process flow is simple and clear, the work intensity of operators is reduced, the production efficiency is improved, and the daily output is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the drill body processing process of the present invention;

[0035] Figure 2 It is a schematic diagram of the drill body after turning-external circle-water hole;

[0036] Figure 3 It is a schematic diagram of the drill body after thread rolling;

[0037] Figure 4 It is a schematic diagram of the drill body after opening the water tank;

[0038] Figure 5 This is a schematic diagram of the drill body after milling the powder groove;

[0039] Figure 6 This is a schematic diagram of the drill body after the front bevel of the slot is processed;

[0040] Figure 7 The drill body is shown after the milling cavity;

[0041] Figure 8 It is a schematic diagram of the drill body after milling the back angle;

[0042] Fig. 9 Schematic diagram of the round head rear drill body. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] Example:

[0045] See also Figure 1-9 The method for producing a diamond composite anchor drill body for coal mines comprises the following steps:

[0046] Step 1: Forging the blank. The basic shape and size of the drill body blank are formed through the forging process. The blank reserves machining allowance. By forging the outer structure size of the drill body, materials and machining time are saved. The temperature, pressure and time need to be controlled during the forging process to ensure the density, strength and uniformity of the blank.

[0047] Specifically, during the forging process, the blank will reserve the necessary processing allowance for subsequent fine processing. By accurately forging the external structural dimensions of the drill body, it can not only effectively save raw materials, but also greatly reduce machining time and improve production efficiency.

[0048] Step 2: Turning - outer circle - water hole, turn the blank to accurately control the outer circle size of the drill body, and use a lathe and twist drill to process the water hole at the specified position. The processing of the water hole by lathe and twist drill saves secondary clamping drilling machine-drilling and improves processing efficiency; the outer circle of the blank is processed to the designed size by turning, and a hole is drilled in the drill body as a water hole for cooling and chip removal during the drilling process to increase the service life of the drill body. Among them, the outer diameter tolerance of the outer circle water hole is between ±0.01mm and the length tolerance is between ±0.02mm. Metric buckles and coarse buckles are used to drill water holes with 4.8mm drill bits, and imperial buckles are used to drill water holes with 3.8mm drill bits; the outer surface finish requirement is 3.2. The sum of the thicknesses on both sides of the water hole of the drill body is 8mm, with a tolerance of 0.05mm.

[0049] Specifically, place the blank on the lathe and fix it securely, use a turning tool to turn the outer circle of the blank to reach the designed size; finely adjust the outer circle size according to the tolerance requirements (±0.01mm); drill holes at designated locations as water holes for cooling and chip removal; select the drill bit according to the type of buckle body: use a 4.8mm drill bit for rough buckle bodies and a 3.8mm drill bit for imperial buckle bodies; ensure that the tolerance of the water hole length is between ±0.02mm; after processing, the outer surface finish must reach 3.2.

[0050] Step 3: Thread rolling: Use a thread rolling machine to roll thread on one end of the drill body to form a thread structure that meets the requirements for connecting the drill rig drill rod. Before thread rolling, the outer diameter, length and outer diameter of the drill body at the thread need to be checked, and thread rolling can only begin after passing the inspection.

[0051] Specifically, before the thread rolling process, the outer diameter, length and outer diameter of the drill body are strictly checked to ensure that the basic size and shape of the drill body meet the design requirements, laying a good foundation for the subsequent thread rolling process.

[0052] During the thread rolling process, we use professional thread rolling tools to form uniform and continuous threads on the surface of the drill body through precise control and operation. These threads not only have good connection performance, but also ensure the close fit between the drill body and other components, improving the overall use effect.

[0053] Step 4: Slotting. Open necessary slots on the drill body to meet the use requirements. When slotting, the slot depth of each model is 14mm, the slot width is 7mm for φ32 drills, and 5mm for drills below φ32. The slot depth tolerance is 0.1mm, and the width tolerance of the two wings after slotting is 0.1mm. The main purpose of opening a water slot on the drill body is to ensure the circulation of the flushing liquid, so as to remove rock powder and cool the drill bit.

[0054] Specifically, for drill bodies with a diameter of φ32, the slot width is set to 7mm to provide sufficient space for related components or structures to move; while for drill bodies with a diameter less than φ32, the slot width is uniformly set to 5mm, which not only meets the use requirements but also ensures the overall strength and stability of the drill body. The tolerance of the slot depth is controlled within 0.1mm to ensure that the slot depth is accurate and meets the use requirements. Similarly, the width tolerance of the two wings after slotting is also controlled within 0.1mm to ensure the consistency of the slot shape and size, thereby ensuring the overall performance and stability of the drill body.

[0055] Step 5: Milling the powder groove. The powder groove is machined on the drill body through the milling process to remove the rock powder generated during the drilling process of the finished drill bit, keep the hole clean, and ensure that the rock chips generated during the drilling process can be discharged in time to prevent blockage; the thickness of the water holes on both sides of the drill body of each model is 7mm, with a tolerance of 0.05mm; at the threaded water groove, the diagonal distance is 11mm for metric buckles, 10mm for imperial buckles, and 12.5mm for coarse buckles, with a tolerance of -0.1mm.

[0056] Step 6: Threading, remove the burrs produced by processing on the drill body. In some cases, it is necessary to thread again to meet the connection or fixing requirements. Threading needs to be coordinated with the aforementioned thread rolling steps to ensure the integrity and functionality of the overall structure.

[0057] Step 7: Process the front bevel of the piece socket. The front end of the drill body is beveled to form the front bevel of the piece socket for installing the diamond composite piece. The angle of the front bevel of the piece socket is 18-39 degrees. When processing the front bevel of the piece socket, first adjust the tooling elevation angle and then adjust the positioning bolts to make the drill body clamped horizontally. The milled intersection line is on the same line as the middle water tank line to avoid forming a broken line with the water tank, thereby improving the use effect and life of the drill body.

[0058] By machining the front bevel of the drill socket, we can provide a required bevel for the front end of the drill body for installing the diamond composite piece. This process not only improves the performance of the drill body, but also provides a strong guarantee for its performance in specific applications.

[0059] Step 8: Milling the slot, accurately process the slot for installing the diamond composite sheet on the drill body, ensure that the size and shape of the slot match the diamond composite sheet; the slot depth is 3.2mm or 6mm, and the depth of the two sides of the slot is kept level; the slot height difference is 0.1mm; the depth and height tolerance of the two wings of the slot is required to be 0.15mm; there should be no rounded corners or double corners at the inner corners of the slot. The price of the slot is to ensure that the diamond composite sheet can be accurately embedded and can maintain a good working condition.

[0060] After the slice nest is milled, the slope below the slice nest is 18-39 degrees, and the slope above the slice nest is 0-15 degrees. The setting of the slope increases the welding area between the diamond composite sheet and the drill bit base, improves the welding strength, and ensures the impact resistance and service life of the drill body.

[0061] Step 9: Mill the back angle. The necessary angle and shape are processed on the back of the drill body to improve the stability of the drill body and reduce drilling resistance. The shape and size of the back angle are precisely processed according to the design requirements. The thickness of both sides of the intersection of the milled back angle top line and the top line of the piece nest is consistent, and the thickness is 0.2mm.

[0062] Step 10: Round head. The head of the drill body is rounded to make the drill body have better guidance and processing effect. The arc line of the rounded drill body slot is consistent with the outer circle of the diamond composite sheet; the arc line of the upper top of the outer side of the drill body extends backward and downward; the thickness of the top of the drill body is 1nm. Through round head processing, the resistance during drilling is reduced and the work efficiency is improved. Among them, the drill body processing includes full-piece / half-piece slots, thin-piece 3.2mm slots, and rear-piece 6mm slots. The processing steps are all one-knife forming, and the production efficiency is dozens of times the original.

[0063] In the present application, by improving and reducing the sedimentation links existing in the production process of diamond composite sheet anchor drill body, the process is made more perfect and standardized, the process is simple and clear, the workload of operators is reduced, and the production efficiency is improved. The daily output is increased after the process improvement. After multiple production statistics were carried out after the process improvement, it was found that the daily output after the improved process increased significantly, and the improved process not only saved production costs but also improved production efficiency.

[0064] The main reason for the falling off of diamond composite pieces is that the welding strength between the diamond composite piece teeth and the drill bit base cannot effectively resist the impact on the diamond composite piece teeth caused by improper human operation, complex rock conditions, etc. Due to the extremely harsh construction conditions in underground coal mine tunnels, it is difficult for on-site construction workers to operate strictly in accordance with the drilling construction process regulations. In addition, the mining depth of coal mines is deepening and the stratum conditions are more complicated. Therefore, the welding strength of the diamond composite piece teeth should be improved as much as possible. In addition to optimizing the solder and the welding process, increasing the contact area between the diamond composite piece teeth and the drill body in the structure is also an effective way to improve the welding strength. Due to the small size of the diamond composite piece anchor drill bit itself and the center water hole structure, the contact area between the diamond composite piece teeth and the drill bit base is greatly limited. In the present application, a bevel is machined in front of the piece socket, and a bevel of 18-39 degrees is formed below the piece socket after the piece socket, and a bevel of 0-15 degrees is formed on the side above the piece socket. Figure 7-8 The diagram shows that the slope below the slot is 18 degrees and the slope above the slot is 15 degrees. The setting of the slope increases the welding area between the diamond composite sheet and the drill bit base, improves the welding strength, and ensures the impact resistance and service life of the drill body.

[0065] Specifically, the steps of preparing the diamond composite sheet are as follows: a. purifying and dispersing multi-walled or single-walled carbon nanotubes to obtain carbon nanotube powder. b. mixing the carbon nanotube powder with an adhesive and diamond micropowder, and ball milling to obtain a mixed powder. c. placing the mixed powder on a WC metal substrate, performing vacuum heat treatment, sintering and vacuum aging annealing to obtain a diamond composite sheet.

[0066] Fix the diamond composite sheet to the socket of the drill base by welding or other means, and ensure that the bottom surface of the alloy has an inclination angle to enhance impact toughness and cutting speed. Assemble other components, such as chip removal rods, protective pads, etc., to ensure the integrity and functionality of the drill body structure.

[0067] The diamond composite sheet can be firmly fixed in the drill body sheet cavity by a brazing process; the temperature and time are strictly controlled during the brazing process to avoid damage to the diamond composite sheet or loose brazing.

[0068] After the diamond composite sheet is fixed to the drill body, the drill body is fully inspected for quality, including dimensional accuracy, shape and position accuracy, and the fixing strength of the diamond composite sheet, to ensure that it meets the use requirements. In order to prevent the drill bit from rusting during storage and transportation, it needs to be treated with anti-rust treatment. A protective film is formed by spraying anti-rust paint or electroplating. At the same time, the surface of the drill bit is polished or sandblasted to improve its appearance quality and increase wear resistance.

[0069] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for producing a diamond composite anchor drill body for coal mines, characterized in that: The steps include: Forging blank: the basic shape and size of the drill body blank are formed through forging process, and the blank reserves machining allowance; Turning - outer circle - water hole, turning processing is performed on the blank, the outer circle size of the drill body is accurately controlled, and the water hole is processed at the specified position; Thread rolling: rolling is performed on one end of the drill body to form a thread structure that meets the requirements for connecting or fixing other components; Slotting: Open necessary slots on the drill body to meet usage requirements; Milling powder groove: The powder groove is machined on the drill body through milling process to remove rock powder generated during the drilling process of the finished drill bit and keep the hole clean; Threading, removing burrs produced by machining on the drill body; The front bevel of the piece nest is processed by bevel processing on the front end of the drill body to form the front bevel of the piece nest for installing the diamond composite piece. The angle of the front bevel of the piece nest is 18-39 degrees. Milling the slot, accurately machining the slot for installing the diamond composite sheet on the drill body, ensuring that the size and shape of the slot match the diamond composite sheet, and after milling the slot, the side above the slot is a 0-15 degree slope, and the side below the slot is a 18-39 degree slope; Milling back angle, processing the necessary angle and shape on the back of the drill body to improve the stability of the drill body and reduce drilling resistance; Round head: The head of the drill body is rounded to make the drill body have better guidance and processing effect.

2. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: The outer diameter tolerance of the outer circle water hole is between ±0.01mm and the length tolerance is between ±0.02mm. For metric buckles and coarse buckles, the water holes are drilled with a 4.8mm drill bit, and for imperial buckles, the water holes are drilled with a 3.8mm drill bit.

3. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: Before thread rolling, the outer diameter, length and outer diameter of the drill body and the threaded part need to be checked, and thread rolling can be started after they are qualified.

4. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: When grooving, the groove depth of each model is 14mm, the groove width is 7mm for φ32 body, and 5mm for body below φ32. The groove depth tolerance is 0.1mm, and the width tolerance of the two wings after grooving is 0.1mm.

5. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: The total thickness of the water hole on both sides of the drill body is 8mm, with a tolerance of 0.05mm; At the threaded sink, the diagonal distance for metric buttons is 11mm, for imperial buttons is 10mm, for coarse buttons is 12.5mm, and the tolerance is -0.1mm.

6. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: When processing the front bevel of the slot, first adjust the tooling elevation angle and then adjust the positioning bolts to make the drill body clamped horizontally; The milled intersection line is in line with the middle sink line to avoid forming a broken line with the sink.

7. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: The depth of the film nest is 3.2mm, and the depth of both sides of the film nest is kept level; The height difference between the sheet and the nest is 0.1mm; The depth and height tolerance of the two wing slots is required to be 0.15mm; There should be no rounded corners or double corners at the inner corners of the tablet nest.

8. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: The thickness of both sides of the intersection of the milled upper top line of the back angle and the upper top line of the piece nest is consistent, which is 0.2mm.

9. The method for producing a diamond composite anchor drill body for coal mines according to claim 1, characterized in that: The arc line of the rounded drill body pocket is consistent with the outer circle of the diamond composite sheet; The upper arc line on the outer side of the drill body extends backward and downward; The thickness of the drill body at the top is 1 nm.

Images