73 results about "Drilling force" patented technology

The utility model discloses a metal pipe drilling device and relates to the technical field of metal pipes. A supporting plate is fixedly installed at the top of the workbench, an electric push rod is fixedly installed at the bottom of the workbench, an output shaft at the top of the electric push rod is fixedly connected with the supporting plate, a fixing frame is fixedly installed at the top of the workbench, a controller is fixedly connected to the top of the workbench on one side of the fixing frame, and a drill bit is arranged at the bottom of the fixing frame at the top of the workbench. A hydraulic cylinder is fixedly installed at the top of the fixing frame, and an output shaft at the bottom of the hydraulic cylinder is fixedly connected with the drill bit. The inner wall of a pipe can be supported and protected through the supporting component and the limiting component, the situation that the pipe is deformed due to the fact that the drilling force is too large or the clamping force of the clamping component on the metal pipe is too large is avoided, and the four push blocks and the four check blocks can be adjusted in a telescopic mode through the sleeve. And therefore, the inner walls of the pipes with different radiuses can be quickly supported, and the working efficiency is improved.

The invention relates to the technical field of bone drilling force prediction, and discloses a bone drilling force prediction method and device based on a CT image. The method comprises the following steps: S1, generating a three-dimensional image at a drilling position; s2, a fitting function of the bone mineral density m changing along with the thickness x is obtained; s3, establishing a function that the drilling force changes along with the bone mineral density; s4, establishing a drilling force model based on a bone mineral density measurement result; s5, calibrating and verifying the drilling force model based on the bone mineral density measurement result to obtain a determined drilling force model; and S6, predicting the drilling force changing along with the drilling depth by using the drilling force model determined in the step 5. The device comprises a CT image module, a feature extraction and analysis module and a drilling force prediction module. According to the method, the nonlinear relation model of the drilling force changing along with the bone mineral density based on the CT image is established, the change of the drilling force is predicted according to different distribution of the bone mineral density, a basis is provided for a personalized operation scheme, and the operation risk is reduced.

The invention discloses a drilling force prediction method based on a Clarii figure, which comprises the following steps: representing drilling vibration of a composite material with carbon fibers in unidirectional arrangement through the Clarii figure to obtain a frequency value of self-excited vibration of a workpiece, then solving a dynamic cutting force coefficient under the influence of the drilling vibration, and in the dynamic cutting process, calculating the dynamic cutting force coefficient of the workpiece. And predicting the dynamic cutting force according to the dynamic cutting force coefficient, the cutter rotating speed, the cutter feeding speed and the cutting area at the feeding time. By predicting the change of the cutting force, machining vibration caused by violent fluctuation of the cutting force can be avoided, so that the risks of cutter damage and workpiece surface defects are reduced, cutting parameters can be helped to be adjusted, the stability of the cutting process is kept, and the machining precision and the surface quality are improved.

The invention discloses a steel easy-cutting performance detection method and device, a medium and equipment. The method comprises the steps that the first target drilling force of a steel sample is obtained; acquiring a second target drilling force of the steel to be measured; based on the first target drilling force and the second target drilling force, the easy cutting index of the to-be-tested steel is determined, and the easy cutting index is used for representing the easy cutting performance of the to-be-tested steel. Through the technical scheme provided by the invention, the convenience of detecting the easy-cutting performance of the steel can be improved.

The invention discloses a movable deep-sea large-depth rock core sampling drilling machine, and relates to the technical field of rock core sampling, the movable deep-sea large-depth rock core sampling drilling machine comprises a main machine and a drilling unit assembled at the front end of the main machine, and the drilling unit is used for executing drilling operation; the multiple drill rod drilling tools are arranged on the main machine in a stacked mode, and a conveying unit used for conveying the drill rod drilling tools to the front end is arranged on the main machine; the drill rod processing arm is arranged on the drilling unit in a sliding manner; comprising an output motor. According to the movable deep-sea large-depth core sampling drilling machine, the drilling machine stretching arm is driven to stretch and contract in the horizontal direction so as to drive the drilling unit to incline forwards or swing backwards along the rotating shaft, so that the drilling unit is deflected to a proper angle and is nearly perpendicular to the drilling ground, and it is guaranteed that drilling force is stable; and the bearing-feeding action is completed through the arrangement of the drill rod processing arm, so that the replacement of the drill rod and the drill tool is simpler.

The application discloses a bone drilling force prediction method based on CT and drilling working conditions, which comprises the following steps: step 1, extracting the contact surface image sequence of the drill bit and the bone tissue on the bone drilling path from the CT image and performing pretreatment; step 2, inputting the pretreated contact surface image and the drilling working condition parameters into a multi-physical factor fusion module to obtain an image sequence of the fused working condition physical information; step 3, inputting the image of the fused working condition physical information into an image coding network to extract the drilling force features in the section; and step 4, inputting the sequence composed of the drilling force features of all sections on the drilling path into a sequence regression network ATP-UNeXt to obtain the prediction of the drill bit stress sequence on the drilling path. The application has the advantages that the drilling force related physical factors can be comprehensively considered, more accurate preoperative stress prediction can be provided, the model reasoning speed is fast, the application is suitable for a clinical operation auxiliary system, and the cost of the operation auxiliary system is reduced.

The present invention provides a method and system for predicting vibration of hole processing in ceramic / FRP laminated composite components, which relates to the field of mechanical processing and material science and technology. The present invention generates a dynamic coefficient by calculating dynamic parameters such as low-frequency axial vibration frequency and amplitude change, obtains processing parameters such as material removal rate, chip removal efficiency, drilling force and drilling temperature, generates a wear coefficient for evaluating drill wear, and constructs a comprehensive mathematical model based on the dynamic parameters and processing parameters, analyzes the relationship between process effect and processing conditions, uses the dynamic coefficient and wear coefficient in the comprehensive mathematical model to calculate and generate an evaluation index, sets a vibration threshold, compares it with the evaluation index, and determines whether the processing parameters need to be adjusted. The present invention achieves the purpose of optimizing processing parameters, improving production efficiency and processing quality, and preventing mechanical failures by calculating dynamic and wear parameters, constructing a comprehensive mathematical model, and setting a vibration threshold for comparison.

The invention relates to the technical field of shaft machining, in particular to an automobile gear shifting shaft and a machining method thereof. A plurality of radial holes need to be machined in a shaft body of the gear shifting shaft, and a specific angle relation exists between the axes of the holes. The core machining method is implemented on the basis of a turning and milling composite machine tool and mainly comprises the three stages that firstly, the clamping state of the gear shifting shaft is synchronously detected through multiple sensors, data fusion analysis is conducted through a central processing unit, and an execution mechanism is driven to conduct cooperative correction on a chuck so as to optimize the clamping precision; secondly, performing pre-compensation calculation based on a target angle, a pre-calibration parameter and a residual deviation during indexing positioning, and performing real-time compensation on an indexing error by utilizing a micro-motion mechanism; and finally, in the drilling process, a self-adaptive tool path is generated by scanning the curved surface to be machined, the drilling force and the tool state are monitored in real time, and machining parameters are dynamically adjusted to restrain drill bit deviation. According to the invention, high-precision and self-adaptive processing of the complex angle hole series is realized.

The invention discloses a bone drilling force prediction method based on CT and drilling working conditions. The bone drilling force prediction method comprises the following steps that 1, a contact surface image sequence of a drill bit and bone tissue on a bone drilling path is extracted from a CT image and preprocessed; step 2, inputting the preprocessed contact surface image and drilling working condition parameters into a multi-physical factor fusion module to obtain an image sequence fused with working condition physical information; 3, inputting the image fused with the physical information of the working condition into an image coding network, and extracting drilling force characteristics in a tangent plane; and step 4, inputting a sequence formed by the drilling force characteristics of all sections on the drilling path into the sequence regression network ATP-UNeXt to obtain prediction of a drill bit stress sequence on the drilling path. The method has the advantages that physical factors related to the drilling force can be comprehensively considered, more accurate preoperative stress prediction is provided, the model reasoning speed is high, the method is suitable for a clinical operation auxiliary system, and the cost of the operation auxiliary system is reduced.

The utility model discloses an efficient drilling device for mining, which comprises a lifting frame, a chain is arranged in the lifting frame, the outer side wall of the chain is fixedly connected with a fixing frame, the top of the fixing frame is fixedly connected with a driving motor, and a driving shaft of the driving motor penetrates through the fixing frame and is provided with a drill rod assembly. A limiting mechanism is arranged outside the drill rod assembly and comprises a base, anchor rods are arranged on the two sides of the base, an annular groove is formed in the center of the base, adjusting rods are arranged at the two ends of the top of the base, and a positioning plate is jointly arranged at the tops of the two adjusting rods. The lifting frame, the drill rod assembly and the limiting mechanism are matched with one another, and the limiting mechanism is arranged outside the drill rod assembly, so that in the mine drilling process, vibration generated when the drill rod encounters resistance in the drilling process is reduced, the drilling stability of the drill rod is guaranteed, drilling force acts in the drilling direction as much as possible, and the drilling efficiency is improved. And drilling is more efficient.

The application discloses a kind of laser-assisted drilling rock breaking intelligent control system and method, comprising: perception module, for obtaining the state information of each component of laser drill, tunneling parameter and drill drilling force;Decision module is used to determine whether the operation of laser drill is normal according to the state information of each component of laser drill, determine the surrounding rock grade under the current tunneling state according to tunneling parameter, and determine the drilling pressure difference between each drill tooth according to drill drilling force, and determine whether the drilling direction of drill is deviated by the drilling direction deviation occurrence threshold value;Execution module is used to determine whether to issue alarm and close laser drill according to the operation of laser drill determination result, select to start corresponding drilling mode according to surrounding rock grade, and adjust laser beam exit angle according to the drilling direction of drill determination result.Advantages: improve tunneling efficiency, ensure drilling stability and safety.

The utility model discloses a novel anchoring part which comprises a nail head and a nail rod installed at the bottom of the nail head, thread self-tapping teeth are arranged on the surface of the nail rod, a pluggable installation block is arranged on the top of the nail head, the novel anchoring part further comprises two positioning grooves, the number of the positioning grooves is two, and the positioning grooves are formed in the left side and the right side of the top of the nail head respectively. A positioning block is installed at the position, corresponding to the positioning groove, of the bottom of the installation block. Through mutual cooperation of the mounting block, the positioning groove, the positioning block, the clamping block, the clamping groove, the fixing groove, an adjusting block, an inserting block, an inserting groove, a reinforcing rod, a reinforcing groove, a buffer spring and a pushing block, an inner hexagonal hole or a cross-shaped hole can be selected for the anchoring part according to needs, when the inner hexagonal hole is used, the mounting block can be detached from the nail head, and therefore the anchoring part is convenient to use. And meanwhile, the stability when the mounting block and the nail head are connected and mounted can be guaranteed, glue and cement sand are poured into the pouring cavity through the through opening, and therefore the drilling force of the nail rod is further improved.

The invention discloses a drilling force calculation method based on a unit cutter linear synthesis method and transfer learning, which comprises the following steps of: firstly, dividing a drilling cutter into a plurality of unit cutters by adopting the unit cutter linear synthesis method, and calculating and synthesizing the cutting force on each unit cutter to obtain the cutting force on a whole drilling edge; on the basis, an existing drilling force calculation neural network model is migrated to a new drilling task by utilizing a migration learning technology, and rapid and accurate calculation of the drilling force is realized by finely adjusting the weight of the model. According to the method, the accuracy of a unit tool linear synthesis method and the high efficiency of transfer learning are combined, the influence of multiple factors such as the geometrical shape of the twist drill and the workpiece material can be fully considered, and the accuracy and reliability of drilling force calculation are improved; the method has a wide application prospect in machining, can be used for optimizing cutting parameters and improving the machining efficiency and the workpiece quality, and provides effective reference and guidance for machining personnel.

The present invention belongs to the technical field of oil drilling, and particularly relates to a full-metal positive-displacement downhole motor. The adopted technical solution includes a connecting sleeve, a connecting rod valve, a limiting ball, a limiting cover, a chuck, a piston, a right-handed worm, a housing, a flat thrust ball bearing, a left-handed worm, a series bearing, a one-way shaft, an upper end cover, an upper one-way bearing, a lower one-way bearing, a connecting shaft, a spring, a lower sub, an axial limiting bearing, and a lower end cover. The connecting rod valve, the chuck and the piston cooperate to control the drilling fluid to push the double worms to move axially and circumferentially along the spiral internal teeth on the inner surface of the housing, and the generated rotation is transmitted to the drill bit through the one-way bearing. When moving to the lower limit position, the chuck and the piston control the drilling fluid to release pressure, and the reaction force of the spring causes the whole to reset. The present invention provides a full-metal positive-displacement downhole motor, which is applied to the exploration of high-temperature and high-pressure deep wells, has strong drilling force, high reliability, and strong applicability.

The application provides a kind of robot-assisted kirschner wire bone drilling mechanics model construction method, comprising: analyzing the process of robot-assisted kirschner wire bone drilling, obtaining the geometric model of mechanical analysis of robot-assisted kirschner wire bone drilling;According to the geometric model of mechanical analysis, a kind of finite element analysis model of robot-assisted kirschner wire bone drilling is established, the influence law of kirschner wire rotating speed, feed speed, the relative angle between kirschner wire and bone surface on drilling force is obtained;According to the data of mechanical analysis geometric model and finite element model, a kind of mechanical model of robot-assisted kirschner wire placement is established, and the mathematical representation between drilling force and kirschner wire rotating speed, feed speed, the angle between kirschner wire and bone surface is obtained.According to the technical scheme provided by the application, the construction of the mechanical model of robot-assisted kirschner wire bone drilling can be realized.

The present invention provides a repair system for adhesives around holes and a self-repair method for damage. The system includes a numerically controlled (CNC) machine tool, a current or voltage control device, a temperature measurement system, brushes, a temperature control system, and a temperature-controlled tool. During machining, the current or voltage control device energizes the temperature control system, which controls the tool temperature. Based on the technical solution of the present invention, the intelligent temperature-controlled tool can, to a certain extent, reduce the drilling force required for the material, lower the difficulty of drilling and reaming the material, significantly improve tool quality and lifespan stability, improve the efficiency of the hole-making process, expand the hole diameter, eliminate burrs, and enhance hole-making accuracy and quality.

The utility model provides a clamping and drilling deformation simulation detection system for a revolving body thin-wall part with a partition plate. The clamping and drilling deformation simulation detection system comprises a supporting part; the clamping part is arranged on the supporting part, and the workpiece is a revolving body thin-wall workpiece with a partition plate; the first pressure detection part is used for detecting the clamping force applied to the workpiece by the clamping part; a drilling simulation device; the second pressure detection part is connected to the drilling simulation device and used for detecting the pressure applied to the partition plate by the drilling simulation device; the adjusting part is used for adjusting the positions of the clamping part and the drilling simulation device relative to the workpiece; and the deformation detection part is used for detecting the clamping deformation and the drilling deformation of the workpiece. In this way, the preset clamping force and the preset drilling force can be applied to the workpiece so as to simulate actual clamping and drilling, the deformation detection part detects the actual clamping deformation and the drilling deformation of the workpiece so as to obtain the relation between the clamping force and the clamping deformation and the relation between the drilling force and the drilling deformation; and a foundation is laid for controlling deformation of the revolving body thin-wall part with the partition plate.

The utility model discloses a high-torque cave-making drill rod, which relates to the field of industrial construction equipment and comprises a drill rod main body, a hole is arranged in the drill rod main body, a plurality of thread grooves are arranged on the inner wall of the hole, an internal rotation drill rod matched with the thread grooves is arranged in the hole, and a sampling device is arranged at the bottom of the internal rotation drill rod. The sampling device comprises a drilling bit, the drilling bit is connected with an internal rotation drilling rod, and a pair of guiding and collecting plates are symmetrically arranged on the two sides of the drilling bit. According to the utility model, the thread design is innovated and improved through the thread mechanics principle, so that the drilling force of the internal rotation drill rod is obviously enhanced, rock breaking and caving can be easily carried out in complex stratums such as hard rocks, the drilling efficiency and quality are effectively improved, and various complex mining operation requirements are met; and meanwhile, redundant geological materials during hole drilling are collected through the arranged sampling device, so that the materials are conveniently analyzed, and subsequent hole drilling operation is facilitated.

The invention discloses a geological water conservancy project environment ecological restoration device, and particularly relates to the technical field of soil remediation. By arranging a longitudinal soil drilling adjusting unit, when the restoration width is large, two limiting frames are away from each other at the same time and slide in a transfer frame in a limited mode, and then two guide frames descend synchronously; then the soil drilling rod is driven to slide downwards by a specific height along the limiting frame, drilling is conducted on soil at different depths, and hard soil is loosened; when the repairing width is small, the two limiting frames get close synchronously to drive the soil drilling rods in the limiting frames to get close, the drilling width is small, the pollution layer with the specific depth is treated through accurate drilling and screening, the unpolluted soil layer below is prevented from being damaged, meanwhile, the same drilling force is applied to soil at different points, the consistency of the soil loosening effect is guaranteed, and the repairing efficiency is improved. In this way, the physical boundary of drilling operation is delimited, it is ensured that the soil drilling rod does not exceed the preset repairing area, and interference on a non-target area is achieved.

The invention relates to the field of geotechnical engineering investigation, and discloses a real-time working condition judgment and depth acquisition method based on drilling parameters. According to the method, a drilling parameter sensor is additionally arranged on a drilling machine and used for collecting parameters such as displacement, drilling speed and drilling force of an active drill rod in real time; by calculating the displacement difference of the power head and combining the displacement critical value, the drilling speed and the drilling force, the up-down moving state of the drill rod is judged, and therefore the working conditions of rotary drilling, rotary lifting, pipe screwing, pipe unloading, empty releasing, empty lifting, lowering with the rod, hovering static, hovering idling and the like are distinguished; a depth updating rule is set according to different working conditions, the drilling depth is corrected under the working condition that substantial influence is generated on the position of the drill bit, and the depth is kept unchanged under other working conditions. By means of the method, the real-time monitoring and drilling depth of drilling construction can be accurately obtained, the authenticity and reliability of exploration results are improved, and meanwhile data support is provided for researching the relation between drilling parameters and stratum soil.

The disclosure concerns oil drilling technology, and specifically an all-metal intelligent control motor (AMIM). The AMIM comprises an electric control module, a power module and a transmission module. The electric control module determines the axial position of the connecting rod valve through an electromagnet and controls the connection between the connecting rod valve and the piston through an electric motor. The hydraulic pressure of drilling fluid and the spring reaction force in the power module push a double worm to move axially and circumferentially under the action of internal teeth on the inner surface of shell. A one-way bearing ensures that the power module only transmits unidirectional motion. The transmission module axially limits the power module through TC bearings and transmits circumferential motion, drilling pressure and torque to the lower drilling tool. The AMIM is suitable for all kinds of deep well exploration, with a stronger drilling force, a lower cost and a higher applicability.

The present invention discloses a drilling force prediction method based on Chladni figures. The method uses Chladni figures to characterize the drilling vibration of a composite material with unidirectional carbon fibers, obtains the frequency of the self-excited vibration of the workpiece, and then calculates the dynamic cutting force coefficient under the influence of the drilling vibration. During the dynamic cutting process, the dynamic cutting force is predicted based on the dynamic cutting force coefficient, tool rotational speed, tool feed rate, and cutting area at the feed time. By predicting changes in cutting force, the present invention can avoid machining vibration caused by drastic fluctuations in cutting force, thereby reducing the risk of tool breakage and workpiece surface defects. It can also help adjust cutting parameters to maintain the stability of the cutting process, thereby improving machining accuracy and surface quality.

The application discloses a self-centering three-blade superhard micro drill and belongs to the technical field of mechanical machining. The drill tip comprises a main cutting edge, a relief intersection line, a relief surface and a drill core tip. The inner surface of the spiral groove intersects with the relief surface to form an arc-shaped main cutting edge. Three relief intersection lines are formed by the intersection of two relief surfaces. The three relief intersection lines intersect to form the drill core tip. The self-centering three-blade superhard micro drill provided by the application adopts a polyhedral drill tip structure instead of a horizontal blade structure. The main cutting edge adopts three symmetrical cutting edges. According to the material type, the spiral groove adopts a small spiral angle shallow groove structure or a large spiral angle deep groove structure. The tool has good self-centering performance, fine chip and chip removal effects, can effectively reduce the axial drilling force on the unit cutting edge length in the drilling process, improves the bending resistance and wear resistance of the tool, and is suitable for high-quality and high-efficiency machining of micro holes.

The invention relates to an automatic drilling and sampling method and system of a spiral drilling tool for uncertain lunar surface working conditions, and belongs to the field of deep space exploration. According to the method, for a deep complex lunar soil profile, on the basis of sensing parameters, such as drilling force load, drilling torque and drilling temperature rise, of the action of a drilling tool and lunar soil in the drilling process, dynamic sensing of the lunar soil profile is conducted, the working state of the lunar soil profile is analyzed, a genetic algorithm is adopted for training the drilling parameters, an intelligent drilling strategy is autonomously formed, and intelligent drilling is achieved.

The invention discloses an ultrasonic-assisted titanium alloy continuous drilling method based on heat accumulation utilization, belongs to the technical field of titanium alloy material drilling machining, and aims at solving the problem that existing titanium alloy material continuous drilling still needs large drilling force. The heat transfer radius of a workpiece is calculated, the radius of a heat affected zone of the workpiece is detected, a drilling strategy is determined according to the heat transfer radius and the radius of the heat affected zone, when the distance between to-be-drilled holes is large, heat accumulation is increased in a process hole drilling mode, the to-be-drilled holes are drilled after the heat accumulation amount is increased, and the machining strategy is dynamically adjusted through the real-time temperature of the drilling area of the workpiece. Through tests, according to ultrasonic vibration auxiliary drilling capable of actively managing heat, the drilling force is remarkably reduced under different machining parameters, and compared with traditional ultrasonic vibration auxiliary drilling with a heat dissipation strengthening thought, the maximum reduction amplitude reaches 19.7%. And the abrasion of the cutter can be reduced.

The utility model discloses a special tool for a carbon fiber bearing seat machining center, which comprises a machining platform, a limiting baffle and a drilling mechanism are respectively arranged on side supports on the left side and the right side of the machining platform, a hot working bottom plate is arranged on the upper surface of the machining platform, and an electric heating pipe arranged in a lug is arranged in the hot working bottom plate. Two rows of vertical heat conduction columns are uniformly distributed on the electric heating pipe, so that the temperature generated by the operation of the electric heating pipe is conducted to a heat conduction rubber block through the heat conduction columns, and the heat conduction rubber block conducts heat to the bearing seat, so that the bearing seat bears the drilling acting force generated by the drilling mechanism in the heating process; the layering resistance of the carbon fibers is improved by increasing the temperature of the carbon fibers, the problem that the carbon fiber bearing seat is layered under the drilling acting force is solved, the machining reject ratio of the carbon fiber bearing seat is reduced, and the machining efficiency of the carbon fiber bearing seat is improved.

The invention relates to the technical field of automobile part drilling, and particularly provides an automatic automobile part drilling machining device which comprises a workbench, a bearing plate, a drilling mechanism, an outer clamping mechanism, an inner supporting clamping mechanism and a bearing reinforcing mechanism. Through cooperation of the inner supporting and clamping mechanism and the outer clamping mechanism, when the bearing plate drives the hub to move upwards, the hub is automatically centered, positioned and clamped inside and outside at the same time, and the accuracy of the hub drilling position and the stability in the drilling process are greatly improved; after the bearing plate moves upwards by a certain height, the bearing and reinforcing mechanism carries out bearing and reinforcing on the bottom of the bearing plate, and the state of the hub clamped by the outer clamping mechanism and the inner supporting and clamping mechanism is locked through the locking assembly, so that the bearing and reinforcing mechanism can carry out bearing and reinforcing on the bearing plate; and the situation that when the hub is drilled, the bearing force of the bearing plate is insufficient under the impact effect of drilling force, and the drilling quality of the hub is affected is prevented.

The utility model discloses drilling equipment for power distribution cabinet processing, which comprises a placing frame and a plurality of sections of drill bits, the placing frame is provided with a top frame through a vertical frame in a supporting manner, an electric telescopic cylinder is fixedly supported on the top frame, the tail end of a telescopic rod of the electric telescopic cylinder extends to the lower part of the top frame and is fixedly provided with a lifting pressing frame, and the lifting pressing frame is provided with a plurality of sections of drill bits. A plurality of driving box hanging columns are installed on the lifting pressing frame in a sliding mode, the bottom ends of the driving box hanging columns and a driving box arranged below the lifting pressing frame are fixedly installed together, a pressure sensor is installed at the center of the bottom of the lifting pressing frame, and a motor is fixedly installed at the top of the inner side of the driving box; and the motor is connected with a driving shaft. The drilling device has the beneficial effects that drilling of different hole diameters can be conducted on the power distribution cabinet plate without replacing a drill bit, pressure feedback control is adopted in the drilling process to control the downward-pressing drilling force, and the situation that the periphery of a hole deforms excessively due to the fact that the power distribution cabinet plate is stressed excessively in the downward-pressing drilling process is avoided.