152 results about "Helix angle" patented technology

The invention discloses a reverse type annular tooth groove planetary roller screw which comprises a nut, a screw rod, a plurality of rollers and a retainer, a multi-head internal thread is arranged in the nut, the rollers and the screw rod are both of an annular tooth groove structure without a helix angle, and the annular tooth grooves of the rollers are meshed with the internal thread of the nut and the annular tooth grooves of the screw rod respectively; first gears are machined at the two ends of the annular tooth groove of the lead screw, second gears are machined at the two ends of the annular tooth groove of the roller, and the first gears are meshed with the multiple second gears at the same time. The retainer is of an integral flexible retainer structure, and the pin rollers have the self-adaptive capacity in multiple directions in the circumferential direction and the radial direction through the retainer. And an arc-shaped roller path is designed on the screw rod and is matched with the ball spline housing to play a linear rolling guiding and rotation stopping role on the screw rod. The reverse lead screw has the advantages of being large in transmission ratio, compact in structure, easy to machine and assemble, low in cost, good in self-adaptive performance, high in positioning precision, good in reliability and the like.

The invention relates to a reverse toothless planetary roller screw, and belongs to the technical field of roller screws, the reverse toothless planetary roller screw comprises a screw rod, a long nut, a planet carrier assembly and a plurality of rollers, and the periphery of the screw rod is sequentially provided with a front shaft section, an external thread section and a rear shaft section; internal threads are arranged on the inner wall of the nut; each roller comprises a threaded part in the middle and polished shaft parts at the two ends; the thread part of the roller and the external thread section of the lead screw are opposite in rotation direction and equal in lead angle; the planet carrier assembly comprises a middle retainer, and the middle retainer is provided with at least three open grooves used for assembling the pin rollers in the radial direction. By canceling a screw rod gear / ring groove and pin roller gear / ring groove structure and combining a double matching mechanism of the planet carrier assembly, the machining bottleneck of a composite structure is thoroughly eliminated, the axial parallelism and the constant lead characteristic of the pin rollers are guaranteed, meanwhile, vibration noise is remarkably reduced, and high-precision and large-scale mass production is achieved.

This application discloses a method for interference-free honing of a double helical gear using two honing wheels, relating to the field of gear machining technology. The method includes the following steps: Step 1: Establishing a constraint relationship between the shaft intersection angle of the honing gear and the width of the empty groove of the double helical gear, determining the interference-free honing shaft intersection angle, and optimizing the empty groove width; Step 2: Calculating the axial installation distance between the left and right honing wheels based on the structural parameters and shaft intersection angle of the double helical gear, determining the helix angle parameters of the left and right honing wheels, and establishing tooth surface models of the left and right honing wheels by enveloping the tooth surface of the double helical gear; Step 3: Preparing the left and right honing wheels based on the tooth surface models, assembling the left and right honing wheels according to the axial installation distance, and controlling the two honing wheels to perform interference-free honing of the double helical gear tooth surface at a fixed shaft intersection angle. This application can obtain a double helical gear with high surface quality and low noise characteristics through the honing process.

The invention belongs to the technical field of flow meters, and particularly relates to an intelligent precession vortex flow meter which comprises a measuring pipe body, connecting flanges are connected to the left end and the right end of the measuring pipe body, and a swirler assembly is arranged at an inlet of the measuring pipe body. When the intelligent precession vortex flowmeter is used for detecting the fluid with the low flow speed, the Venturi throat hole of the intelligent precession vortex flowmeter is reduced, the local flow speed of the fluid can be effectively increased under the working condition of the fluid with the low flow speed, the vortex generation strength and stability are enhanced, and the signal amplitude and the signal-to-noise ratio are increased; therefore, the measuring sensitivity, the linearity and the lower limit measuring capacity of the flowmeter in a low-flow-speed area are improved, the applicable flow range is expanded, the flow resistance of fluid in the rotation starting stage can be remarkably reduced by changing the spiral angle of the rotation starting device and reducing the using number of the rotation starting blades, and the rotation strength and the precession stability of the fluid at the low flow speed are enhanced.

The invention relates to the field of special tools for machining, in particular to a small-diameter large-lead-angle inner hole spiral groove turning tool and a design method thereof.The design method comprises the steps that S1, the pitch diameter, the lead angle and the spiral angle of a spiral groove are calculated according to the lead and the inner hole diameter of the inner hole spiral groove and the groove-shaped section diameter of the spiral groove; s2, according to the obtained lead angle and helical angle, simulating a tangent plane of an initial position when the turning tool machines a product, and determining angles of a front tool face and a rear tool face of the turning tool; s3, according to the profile size of the groove-shaped section of the spiral groove, the profile size of a turning tool cutting part matched with the spiral groove is designed; and S4, determining the diameter of a turning tool bar and the center height of the turning tool according to the diameter of the inner hole and a lathe machining mode.

The application provides a design and calculation method of main parameters of helical gear flowmeter, and belongs to the technical field of flowmeter. The design and calculation method is obtained by theoretically analyzing the helical gear flowmeter, and the influence of the number of gears, modulus, pressure angle, helix angle, radial clearance of the flowmeter and end face clearance of the flowmeter on the flow pulsation, clearance flow leakage and power loss of the helical gear flowmeter is discussed. In combination with the particle swarm optimization algorithm, two of the three performance indexes, flow pulsation, leakage and power loss, are changed into constraint conditions according to the design requirements, so that the multi-objective problem is changed into a single-objective problem for solving the main parameters of the helical gear flowmeter. Compared with the traditional method of calculating the displacement of the flowmeter through the empirical formula and the empirical coefficient, the application can improve the displacement design precision of the flowmeter, can clearly determine the influence degree of each parameter on the performance of the flowmeter, and can quickly solve the main parameters of the helical gear flowmeter through the optimization algorithm.

An apparatus for receiving a fluid stream therethrough comprises a body having an inlet end and an outlet end and defining a passage axially therethrough from the inlet end to the outlet end. The body comprises a first portion comprising first helical angle elements for inducing a first vortex flow component in the fluid stream, and a second portion comprising second helical angle elements for inducing a second vortex flow component in the fluid stream. The first helical angle elements have one of a left-handed or a right-handed orientation, and the second helical elements have the other of the left-handed or the right-handed orientation. The apparatus may be a tubing insert.

To provide a drive shaft for a vehicle capable of making right and left parts common while equalizing torsional rigidity on the right and left sides.SOLUTION: Any one of the outer circumferential surface spline teeth formed at both ends of the intermediate shaft and the inner circumferential surface spline teeth formed at the first joint and the second joint has a helix angle. The torsion angle is formed such that the inclination direction is opposite between the power source side and the drive wheel side. Accordingly, in a case where the vehicle drive shaft has common specifications on the left and right sides, the substantial axial length for transmitting power is likely to be equal on the left and right sides, and thus the torsional rigidity of the vehicle drive shaft is likely to be equal on the left and right sides. Therefore, in the vehicle drive shaft, it is possible to achieve commonality of components on the left and right sides while making the torsional rigidity equal on the left and right sides.SELECTED DRAWING: Figure 1

The disc type separator comprises a separator body and a stacked connecting sleeve structure on the top, a feeding pipe is divided into a front end and a rear end through a connecting sleeve, positioning is conducted through a second locking block of a flange plate and a second locking groove of the connecting sleeve, and clamping and fixing are conducted through cooperation of a connecting plate driven by a two-way screw rod; and detachable sealing is achieved. The number of layers of the connecting sleeve is matched with the number of separation phases, a core pipe, a sleeve part and a discharging cavity are arranged in the connecting sleeve, spiral flow guide structures are arranged on the core pipe and the sleeve part, and opposite-impact vortexes are avoided through reverse-rotation and gradual-change flow channel sections; an inclined guide plate of the annular buffer cavity assists material pre-rotation, and a light-phase helical angle is larger than a heavy-phase helical angle during three-phase separation. According to the scheme, disassembly and assembly are convenient, sealing is reliable, material flowing can be optimized, multi-phase separation can be adapted, the maintenance time and the material streaming risk are reduced, the separation precision and equipment adaptability are improved, and multi-industry separation requirements are met.

The invention discloses a method for optimal design of a transmission chain of a wind power gear box and a related product. A gearbox transmission chain comprises at least one planetary transmission stage, and the method comprises the steps that an optimization model is established according to the wind power gear transmission chain design problem, and the objective function of the optimization model comprises the maximum transmission chain torque density; the decision variables of the optimization model comprise the number of planetary gears in each planetary transmission stage, and the transmission ratio, modulus, helical angle, tooth width and total displacement coefficient of each planetary transmission stage; and solving the optimization problem by using an optimization algorithm to obtain an optimal decision variable value. According to the method, the mathematical model is established with the purpose of maximizing the torque density of the transmission chain, the optimization algorithm is used for solving, the optimal decision variable value is obtained, and then the design of the high-torque-density wind power gear transmission scheme is rapidly completed.

A self-locking screw includes a screw body and a screw head. The screw body includes a screw shank, a screw tip, a thread, serrations, and protrusions. The screw tip is a square pyramidal shape formed by four flat beveled surfaces. The serrations begin at the connection between the screw shank and the screw tip, spiraling upwards to the middle section of the screw shank with a helix angle of 15°. The crest of the serrations is lower than the crest of the thread. The protrusions are located on the screw shank, with multiple protrusions spiraling upwards from the side near the serrations to the end of the thread away from the screw tip, with a helix angle of 60°. The protrusions are hemispherical, with a flat plane at the end away from the screw shank surface, the height of which is less than the crest height of the thread. The invention also provides a die for cutting a self-locking screw, wherein a stationary die and a movable die form the protrusions through recessed points, and the serrations are formed by the serrations.

A double helical gear (1) for a hydraulic gear device (2) having a tooth profile (4) that does not cause locking, configured to be coupled to a support shaft (5) to form a drive gear or driven gear of the hydraulic device, comprising a plurality of teeth (6) extending longitudinally or axially with a variable helix angle in a compound function, wherein the tooth profile (4) maintains shape continuity in each cross section, and each tooth (6) in the longitudinal direction is divided into five zones: a starting zone (A), a proximal intermediate zone (B), a central zone (C), a distal intermediate zone (D), and a terminal zone (E), wherein the starting zone (A), central zone (C), and terminal zone (E) have a variable helix angle (ψ), and the proximal intermediate zone (B) and distal intermediate zone (D) have a constant helix angle (ψ).

This utility model provides a dual-impeller pressure-balanced high-lift water pump, which improves the high-pressure stable output efficiency of high-lift, large-size water pumps through a differentiated and synergistic design of the two-stage impellers. It includes a pump body, a main shaft, and a cavity within the pump body. The portion of the cavity near the inlet constitutes the inlet cavity, and the portion near the outlet constitutes the outlet cavity. The main shaft is equipped with a split-flow impeller assembly, including a first-stage impeller and a second-stage impeller. The first-stage impeller has 5-7 blades with an outlet angle β1 = 22° ± 2°. °; the secondary impeller has 9-11 blades, with an exit angle β2 = 18° ± 2°; the blade diameter ratio of the primary impeller to the secondary impeller is 3:2; a flow guide baffle pressure balance chamber is provided between the primary and secondary impellers; the inlet of the flow guide baffle pressure balance chamber is provided with an involute spiral guide groove with a spiral angle α = 25° ± 5°; the flow guide baffle pressure balance chamber is provided with a slag discharge hole with a diameter of 4 mm and an exhaust hole with a diameter of 1.5 mm; a honeycomb damping plate is provided on the outlet side of the flow guide baffle pressure balance chamber.

The application discloses a pipeline detection robot, which comprises multiple groups of coaxially arranged variable-diameter mechanisms, detection mechanisms are arranged on a part of the variable-diameter mechanisms and are used for detecting inner walls of the pipeline, and screw-in wheels are arranged on a part of the variable-diameter mechanisms, the screw-in wheels are used for being attached to the inner walls of the pipeline under the support of variable-diameter supports, and a helix angle exists between a rolling axis of the screw-in wheels and an axis of a first annular frame in the variable-diameter mechanisms, so that the screw-in wheels are rolled along a helix line of the pipeline wall under the driving of a feeding drive, and the pipeline detection robot is axially advanced along the pipeline. The unique helix angle arrangement of the screw-in wheels realizes the driving of the robot advancing in a helix driving mode, the pipeline detection robot has the advantages of simple and compact structure, strong dragging capacity and good application in the detection of medium-diameter and even small-diameter pipelines. The variable-diameter supports are arranged in a form that concave arc surfaces of the first arc-shaped frame and the second arc-shaped frame are oppositely arranged, have a large adjustment span, and thus have good variable-diameter capacity and can be suitable for more pipelines with different diameters.

To reduce shape errors in the shaping of the cutting edge of cutting tools. [Solution] The cutting edge shaping method for a cutting tool comprises a tool preparation step of preparing a cutting tool having an outer blade, and a cutting edge shaping step of shaping the cutting edge by spraying abrasive material from a nozzle onto the cutting edge of the outer blade so that the angle between the spraying direction of the abrasive material from the nozzle and the central axis of the cutting tool is the same as the helix angle of the cutting tool.

The application discloses a gear and toothed belt transmission structure, which comprises an oblique round tooth cylindrical gear and a toothed belt matched with the oblique round tooth cylindrical gear. The oblique round tooth cylindrical gear comprises a base cylinder, a plurality of same oblique gear teeth are uniformly and interval arranged on the side surface of the base cylinder, the normal tooth profile of the oblique gear tooth is a continuous circular arc with a radius of r, the center of the circular arc is on the side surface of the base cylinder and the tooth column is swept along the axial direction with a certain spiral angle β1, the both ends of the tooth column comprise a spherical body which is smoothly connected with the tooth column, the radius of the spherical body is equal to the radius of the normal tooth profile, the toothed belt comprises a bottom plate, the bottom plate is provided with meshing tooth grooves matched with the oblique gear teeth, the vertical width of the opposite sides of the tooth groove is equal to the diameter of the normal section circle of the oblique gear tooth, the included angle β2 between the tooth groove and the projection of the gear axis is equal to the spiral angle β1 of the gear, the interval P2 of the adjacent tooth grooves is equal to the pitch P1 of the oblique round tooth cylindrical gear, and the projection of the length direction of the corresponding sides of the adjacent two oblique gear teeth on the side surface of the base cylinder is overlapped.

A planetary gear mechanism may include a sun gear fixed to a shaft, a ring gear located coaxially with the sun gear and fixed to a case, a planetary gear meshed with the sun gear and the ring gear, and a carrier configured to rotatably support the planetary gear. A helix angle of teeth of the sun gear and a helix angle of teeth of the ring gear may be set so that a thrust force acting on the sun gear and a thrust force acting on the ring gear are in opposite directions. A power transmission device may include a load transmission path between the sun gear and the ring gear, through which the thrust force acting on the sun gear and the thrust force acting on the ring gear are transmitted, and the load transmission path may include at least a portion of the carrier.

The rotary air cylinder comprises a cylinder barrel, a front cover and a rear cover, the front cover and the rear cover are arranged at the two ends of the cylinder barrel respectively, a piston and a piston rod are arranged in the cylinder barrel, the piston and the piston rod are matched to form a limiting structure, and the limiting structure is used for limiting the rotation angle of the piston rod relative to the cylinder barrel. The limiting structure further limits the axial stroke of the piston moving towards the front cover in the cylinder barrel into a first stroke and a second stroke, the limiting structure comprises a stroke adjusting piece arranged on the piston and / or the piston rod, and the stroke adjusting piece is used for adjusting the length of the first stroke. The length of the first stroke of the piston can be adjusted through the stroke adjusting piece, and then the rotation angle of the piston rod can be adjusted. In the actual production process, air cylinders with different rotation angles can be conveniently produced without changing the spiral angle of the spiral groove of the piston rod, the production cost is saved, and the production efficiency is improved.

This disclosure relates to drilling tools and, in particular, drill bits. Such a drill bit comprises a drill bit body comprising a first caliber block and a second caliber block. The drill bit further comprises a first blade comprising a leading section and a trailing section, the leading section being arranged with a negative helical angle on the first caliber block and the trailing section being arranged with a positive helical angle on the second caliber block.

The invention relates to a differential locking device (10) comprising a first clutch part (11) and a second clutch part (12). In an actuated position, the second clutch part (12) engages a toothed section (18) with a toothed section (17) of the first clutch part (11), thereby establishing a rotationally fixed connection between the clutch parts (11, 12). The toothed sections (17, 18) are configured with helix angles such that, in the engaged position of the second clutch part (12), the transmission of torque between the rotationally fixed clutch parts (11, 12) generates an axial force that acts axially on the second clutch part (12) in its neutral position. In addition, a sensor (38) and an actuator (22) are provided, which can be operated in a closing mode and in this mode introduces an axial closing force acting in the direction of the actuating position into the second coupling part (12).The sensor system (38) can detect at least the axial positioning of the second coupling part (12) in its actuating position, wherein the sensor system (38) can be operated with the actuator (22) in a control system, within which the actuator (22) terminates its closing operation as soon as the sensor system (38) detects that the second coupling part (12) has left the actuating position during the closing operation of the actuator (22).

The invention provides a condensing device and clothes processing equipment, the condensing device comprises a condensing air duct and a turbulent flow module, and the turbulent flow module is arranged in the condensing air duct and comprises turbulent flow blades and a blade shaft; the turbulent flow blades are in a spiral shape and are arranged on the blade shaft in the mode that the spiral angle can be adjusted. When airflow flows along the condensation air duct from bottom to top, a controllable turbulent flow effect is generated through the turbulent flow blades with the adjustable spiral angles, so that the airflow forms vortex or turbulent flow, and the contact area and the contact time between the airflow and condensate water are remarkably increased; not only is the sufficiency and uniformity of heat exchange enhanced, but also different drying conditions can be adapted by adjusting the spiral angles of the turbulent flow blades, the flow velocity distribution of airflow is optimized, and the condensation efficiency is effectively improved; on the basis of ensuring the condensation efficiency, the system is allowed to maintain equivalent heat exchange performance at a lower drying fan rotating speed, so that the fan energy consumption and the operation noise are reduced.

The invention relates to the technical field of cutter blade design, and particularly discloses a cutter optimal blade design method for chatter suppression under specific working conditions, comprising the following steps: S1, setting a helical angle and an initial pitch of a cutter as optimization parameters; s2, calculating a critical stable axial cutting depth through a critical cutting depth calculation function under a specific working condition based on the optimization parameters; and S3, through a particle swarm optimization algorithm, performing optimization by taking the critical axial cutting depth as a fitness function, and finding a local optimal blade type. According to the cutter optimal blade design method for chatter suppression under the specific working condition, a complete SLD under the global rotating speed does not need to be drawn, and the calculation efficiency is greatly improved; and the influence of the helical angle and the screw pitch on flutter suppression can be comprehensively considered, the blade type of the cutter is optimized in a wider blade type space, and the flutter suppression requirement of a specific working condition is accurately matched.

To provide a cutting tool capable of improving chip discharge performance especially when performing thrust machining while considering rigidity, and achieving both of chattering resistance and chip discharge performance at a higher level.SOLUTION: The cutting tool includes an end cutting edge 21 formed so as to extend in a radial direction from a center axis side, an outer peripheral cutting edge 24 forming a set of cutting edges 20 together with the end cutting edge 21, and a chip discharge groove 30 provided around the center axis. The chip discharge groove 30 is formed of two or more grooves having different helix angles and including at least a main groove 31 and a sub-groove 32, and the helix angle α of the main groove 31 forming the peripheral cutting edge 24 on the ridge line with the side 10s of the peripheral side surface is the smallest, and the helix angle β of the sub-groove 32 in contact with the main groove 31 and disposed forward of the main groove 31 in the tool-rotating direction is larger than the helix angle α of the main groove 31.SELECTED DRAWING: Figure 5

The present application relates to quenching technical field, especially a kind of continuous high-frequency quenching device.Its technical scheme includes: double-channel cooling cover, it is composed of two cover bodies that are distributed and fixed in support, cover body is opened with several tooth top grooves along the advancing direction of drill rod, several tooth top grooves are distributed in spiral, the helix angle of tooth top groove and the helix angle of drill rod threaded portion are consistent, movable arc-shaped baffle is arranged in tooth top groove, the distance between adjacent tooth top grooves and the pitch of drill rod threaded portion are consistent.The present application separates the threaded portion of drill rod into tooth top and tooth bottom in the way of cooling, thereby reducing the deformation of the whole thread, improving the dimensional accuracy and shape accuracy of thread, and the organization transformation of tooth top and tooth bottom is more uniform, reducing the generation of internal residual stress, the reduction of residual stress can effectively improve the fatigue life of thread, under the same working conditions, the fatigue life of drill rod thread cooled by the present device can be improved compared with traditional way.

A photosensitive member unit is detachably mountable to a main assembly of an image forming apparatus. The photosensitive member unit includes a photosensitive member rotatable about a rotational axis thereof, a rotatable first helical gear portion; and a second helical gear portion integrally rotatable with the first helical gear portion. A twisting direction of a tooth of the second helical gear portion is the same as a twisting direction of a tooth of the first helical gear portion, and a helix angle of the tooth of the second helical gear portion is greater than a helix angle of the tooth of the first helical gear portion.

The application discloses a hydrology and water resource survey device and method, relates to the technical field of ocean exploration sampling, and comprises a steel cable, a support structure, a liquid taking mechanism, a liquid containing mechanism and a moving mechanism. The liquid taking mechanism comprises a vertical slide and a sliding block. The liquid containing mechanism comprises multiple groups of sample tanks. The moving mechanism comprises a cable holding block. In the application, as the device sinks, the cable holding block in the moving mechanism rotates while moving downward, so that the sliding block is lifted upward through a transmission structure. When the sliding block contacts a pressing plate, the sliding block stops moving, and a male quick connector is connected with a female quick connector, so that seawater is input into the sample tank. Since the steel cable has a standard specified spiral angle, the sliding block is lifted to a specified height when the cable holding block rotates a specified number of turns by adjusting the gear transmission ratio, so that the device samples after moving downward to a specified depth, and the sampling depth of the sample meets the actual setting.

This invention discloses a symmetrical non-rotational composite material oblique mesh structure suitable for automated molding, comprising an upper frame, a lower frame, and bidirectional helical ribs; the upper frame, lower frame, and bidirectional helical ribs are integrally molded structures, and the structural materials used for the upper frame, lower frame, and bidirectional helical ribs are composite materials; the bidirectional helical ribs include two mutually symmetrical ribs, and the center line of the outer contour surface of each rib is a helix with equal pitch, equal helix angle, or geodesic. This invention further discloses methods for determining the center line of ribs used in various typical symmetrical non-rotational structures applied in aerospace engineering. The oblique mesh structure of this invention is rationally designed, lightweight, and suitable for automated mass production.

This invention discloses a combined turning and grinding machining equipment for internal threads, belonging to the field of internal thread machining technology. It includes a machine tool body, an XY linear motion module, a linear multi-station composite machining mechanism, and a multi-directional adjustable turning and grinding mechanism. The XY linear motion module is fixedly installed on the upper end of the machine tool body. The linear multi-station composite machining mechanism is connected to the moving end of the XY linear motion module. The multi-directional adjustable turning and grinding mechanism is connected to the linear multi-station composite machining mechanism. The multi-directional adjustable turning and grinding mechanism includes a control box, an adjustment component, a movable support component, and a turning and grinding component. Through this method, a small-amplitude, precise tilting angle of the grinding wheel is achieved to match the thread helix angle, while the movable support lifts the turning and grinding component throughout the process, avoiding collision between the turning and grinding component and the inner wall of the small-diameter deep hole, reducing the risk of workpiece damage.

Bi-helical toothed wheel (1) with non-encapsulating profile (4) for hydraulic gear apparatuses (2), configured to be bound to a support shaft (5) to form a driving or driven wheel of said hydraulic apparatus and comprising a plurality of teeth (6) extending with variable helix angle with a composite function in the longitudinal or axial direction of the tooth (6), wherein the teeth profile (4) keeps a shape continuity in each cross section thereof, wherein each tooth (6) in the longitudinal direction is divided into five zones: initial (A), proximal intermediate (B), central (C), distal intermediate (D) and terminal (E), where said initial (A), central (C) and terminal (E) zones have a variable helix angle (ψ) and said proximal intermediate (B) and distal intermediate (D) zones have a constant helix angle (ψ).

The utility model relates to the technical field of drill bits, and provides a high-performance three-blade hard alloy drill bit with a water-drop-shaped chamfer, which comprises a drill bit body and is characterized in that the drill bit body is of a cylindrical straight shank structure, and three spiral chip grooves which are equal in width and are centrosymmetric are formed in the front end of the drill bit body. Spiral chip grooves are formed in the drill bit body, a spiral cutting edge is formed between every two adjacent spiral chip grooves, a water-drop-shaped chamfer is arranged at the edge shoulder of each spiral cutting edge, the chamfer angle of each water-drop-shaped chamfer is 20 degrees, and the width of each water-drop-shaped chamfer is 1 / 10 of the diameter of the drill bit body. And the connection parts of the water-drop-shaped chamfers and the corresponding spiral cutting edges are in circular arc transition. According to the drill bit, due to the fact that the edge shoulders of the spiral cutting edges are provided with the water-drop-shaped chamfers, when deep holes are machined, due to the angle and width design of the water-drop-shaped chamfers, the drill bit is not prone to abrasion and tipping, the service life is longer, and the machining precision is higher and more stable by being matched with a special coating and appropriate spiral angles and rear angles.