54 results about "Hole size" patented technology

The application discloses a method for determining the quality proportion of each grade based on the maximum utilization rate of cement gobi material, and belongs to the technical field of cement stabilized base. Firstly, the aggregate with a particle size greater than the maximum screen hole of a target grading is removed from the original gobi material, and the passing rate is normalized. According to the particle size from small to large, when the normalized passing rate B a of the first determined screen hole p a is not within the range of the set upper limit and the set lower limit of the passing rate, the first grade is set. The passing rate of each screen hole is corrected. According to the particle size from small to large, when the once corrected passing rate B b of the first determined screen hole p b修正1 is not within the range of the set upper limit and the set lower limit of the passing rate, the second grade is set. The passing rate of each screen hole is corrected. The grading is continued or stopped. The quality proportion of each grade is determined. The application can quickly determine the grading screen hole size with the maximum utilization rate of gobi material and the quality proportion of each grade under the condition that the specification requirements of the mixture grading are met.

The utility model discloses a punching rod for inner hole sizing burnishing forming, which belongs to the technical field of cold heading forming processing, and comprises a material passing burnishing punching rod, the material passing burnishing punching rod comprises a rod body and a material passing head, the material passing head is arranged at the front end of the rod body, the material passing head comprises a transition part, a burnishing part and a material passing end, the transition part is connected with the rod body, and the burnishing part is connected with the material passing end. The burnishing part is arranged at the front end of the transition part, and the material passing end is arranged at the front end of the burnishing part; the diameter of the burnishing part is larger than that of the material passing end, and the burnishing part is in smooth transition design between the material passing end and the transition part. The hole broaching device is simple in structure and convenient to use, can eliminate steps left in a hole during hole broaching, ensures that the diameter of an inner hole of a part is within a tolerance range after material passing and burnishing, ensures that the inner surface of the machined hole is smooth and the size of the inner hole is more stable due to the smooth transition design of the two ends of the burnishing part, improves production efficiency, reduces the procedure of secondary machining after cold heading, and reduces production cost. And the production cost is reduced.

The utility model discloses a screening device for product granularity in titanium sponge crushing production, which comprises a base, a screening shell, a motor and a drum screen, the drum screen with adjustable screen hole size is arranged in the screening shell, and the motor drives the drum screen to rotate; particularly, an adjusting mechanism is arranged at one end of the screening shell, adjustment of the relative position between a shielding plate and a screening plate on the rotary screen is achieved through cooperation of a tooth block, a tooth sleeve, a push ring and other components, and therefore the size of screening holes is changed, and the screening requirements of different particle sizes are met. Meanwhile, impurities and particles which do not meet the particle size requirement are effectively collected through the design of the slag discharging groove; the vibrating screen is compact in structure and convenient to operate, improves screening efficiency and product purity, and has wide application prospects and remarkable economic benefits.

The utility model relates to the technical field of inner hole grinding equipment for improving the roughness and cylindricity of an inner hole, in particular to an inner hole grinding tool for improving the roughness and cylindricity of the inner hole, which comprises an adapter rod, a base is fixed at the end part of the adapter rod, a plurality of groups of grinding components are arranged on the outer wall of the base in a sliding manner, and the grinding components are arranged on the adapter rod. The grinding assembly can move in the direction perpendicular to the center line of the adapter rod, the grinding assembly comprises an oilstone sleeve and at least two guide columns, the guide columns are connected with the base in a sliding mode, the ends of the guide columns are fixedly connected with the oilstone sleeve, and grinding oilstone is fixed to the end, away from the adapter rod, of the oilstone sleeve. The inner hole grinding tool is high in structural adaptability, the inner hole grinding tool can adapt to workpieces with different inner hole sizes by replacing components such as the spring and the guide column in the tool, the inner hole grinding tool is wide in applicability, the number of the inner hole grinding tool is reduced, and the machining cost of parts is reduced.

The utility model discloses a kind of shallow circular silo roof inclined roof can be turned over and shrink circular hole protection device, belong to grain storage technical field, including protective frame, the upper surface of the protective frame is installed with protective net, two skeletons are installed in the protective frame lower, the both sides of the skeleton are fixedly connected with connecting plate, connecting block is fixedly connected under the connecting plate.In the utility model, first, each section keel is formed frame by axis pin bolt staggered insertion, forms whole with protective frame and protective net, after whole is placed in alignment hole, it is rotated by four lateral rotating discs, drives screw rod to rotate in connecting block, simultaneously drives antiskid pad to move, makes it tightly presses in hole inner wall, realizes the steady fixation of exempting from punching;Limit baffle is used to ensure that the assembly of each component of skeleton is in place without deviation, the device can be adjusted according to different hole size, install quickly, can be reused, suitable for short construction cycle, operation space is limited inclined roof scene.

The invention discloses a throttling device and a hydrogen cycle test device for a gas cylinder plastic liner material, and relates to the technical field of adjusting systems. Comprising a throttling device body; a cavity channel for air circulation is formed in the throttling device body; one end of the cavity is hermetically communicated with the air inlet pipeline, and the other end is hermetically communicated with the air outlet pipeline; a throttling hole module is installed in the cavity channel. The throttling hole module is hermetically connected with the inner wall of the cavity; a throttling hole is formed in the throttling hole module in the gas circulation direction in a penetrating mode. According to the throttling device and the hydrogen cycle test device for the gas cylinder plastic liner material, the pressure relief rate can be accurately controlled, and the accuracy and the stability of an experimental result are ensured; different pressure relief rate requirements can be met by replacing different types and numbers of throttling hole modules in the throttling device, the throttling characteristic of the throttling device is uniquely determined by the sizes of the precisely machined throttling holes in the throttling hole modules, mechanical abrasion does not exist, repeatability is higher, and the service life is longer.

The utility model provides solid granule screening equipment, which relates to the technical field of screening equipment and particularly comprises a screening box, a material conveying box is fixedly mounted on one side of the screening box, a material conveying groove matched with the material conveying box is formed in the screening box, and a plurality of screening plates are slidably connected into the screening box. And rotating rods are fixedly installed on one sides of the bottoms of the multiple screening plates, the multiple rotating rods are inserted into the screening box and rotationally connected with the screening box, the multiple screening plates are each provided with two telescopic structures, and each telescopic structure is composed of a plurality of sliding plates, a long supporting plate, a short supporting plate and an I-shaped connecting rod. Components on the sieve plate can be driven to change relative positions through the telescopic action of the telescopic structure, so that the screening hole diameter is flexibly adjusted, the sieve plate does not need to be replaced when screening requirements of particles in different particle size ranges are met, the size of the sieve holes can be adjusted only by controlling the telescopic structure, and the screening efficiency is improved. And the universality and the use convenience of the equipment are effectively improved.

The application discloses a manufacturing method of a thin-wall gold cavity with a special-shaped slot hole, and comprises the following steps: a subtractive manufacturing method and an additive manufacturing method are combined, a mandrel is processed by using a subtractive process, a polymer transition layer is grown by using a polymer 3D printing additive process, a gold layer is prepared by using a chemical electroplating or sputtering process, the excess polymer transition layer and the gold layer are removed by using a subtractive process, and finally, the polymer transition layer and the mandrel material are removed by using physical and chemical methods, so that the thin-wall gold cavity with the special-shaped slot hole structure can be obtained, and the demand of physical experiments in the field of inertial confinement fusion on the thin-wall gold cavity part with the special-shaped slot hole structure is met. The manufacturing method of the thin-wall gold cavity with the special-shaped slot hole can obtain the thin-wall gold cavity with the special-shaped slot hole structure with a minimum scale, has the advantages of a wider processing scale, no limitation on the structure by the subtractive manufacturing process and high processing efficiency of the transition layer compared with the method for manufacturing the slot hole or the transition layer by using the traditional subtractive method, and the minimum slot hole size is less than 5 microns.

The invention belongs to the technical field of mold design, and discloses a lightening hole design method, device and equipment and a storage medium. The method comprises the steps that a mold design drawing of a mold is obtained, a mold wall face needing to be provided with a lightening hole is selected from the mold design drawing, and the lightening hole is formed according to preset lightening hole size and shape data; offsetting, projecting and stretching the front contour line and the back contour line of the mold wall surface to determine and obtain a lightening hole opening body, and performing Boolean differencing on the basis of the mold wall surface and the lightening hole opening body to generate a lightening hole; through the method, the design efficiency of the lightening holes can be improved.

This utility model discloses a rotary screening machine with a separating mechanism, relating to the field of screening machine technology. The utility model includes a tank body with two feed inlets connected to the upper part. A tank door is rotatably connected to the outer surface of the tank body. The lower part of the tank body is arc-shaped, and an anti-clogging device is fixedly connected to the bottom end of the tank body. A screening device is fixedly connected inside the tank body. The output end of a first motor extends into the tank body and is fixedly connected to a first rotating shaft. Multiple screen plates are fixedly connected to the inner wall of the tank body, each screen plate having holes, with the hole size decreasing from top to bottom. Multiple scrapers are fixedly sleeved on the outer surface of the first rotating shaft. A support plate is fixedly connected to the lower part of the tank body, and the bottom end of the first rotating shaft is rotatably connected to the support plate. This utility model can classify materials of different particle sizes after screening through multiple screen plates, and can avoid material blockage and accumulation.

The present application relates to the technical field of composite material molding, and particularly relates to a chopped fiber prepreg molding method containing photonic crystal interference sheets and a molded product thereof. The present application locks the gel time at the molding temperature by curing the prepreg, and completes multiple exhausts within the gelation window after the mold is closed and before the mold is opened, and cooperates with segmented pressurization, so that the gas is fully released before the channel is closed. The method significantly reduces the porosity and hole size of the product, improves the density and appearance uniformity, and takes into account the structural strength and optical effect.

The application discloses a method for determining the quality proportion of each grade based on the maximum utilization rate of cement gobi material, and belongs to the technical field of cement stabilized base. Firstly, the aggregate with a particle size greater than the maximum screen hole of a target grading is removed from the original gobi material, and the passing rate is normalized. According to the particle size from small to large, when the normalized passing rate B a of the first determined screen hole p a is not within the range of the set upper limit and the set lower limit of the passing rate, the first grade is set. The passing rate of each screen hole is corrected. According to the particle size from small to large, when the once corrected passing rate B b of the first determined screen hole p b修正1 is not within the range of the set upper limit and the set lower limit of the passing rate, the second grade is set. The passing rate of each screen hole is corrected. The grading is continued or stopped. The quality proportion of each grade is determined. The application can quickly determine the grading screen hole size with the maximum utilization rate of gobi material and the quality proportion of each grade under the condition that the specification requirements of the mixture grading are met.

The present application relates to the technical field of component welding, and provides a spot welding device for electronic components, which comprises a moving table, a welding gun provided on the moving table and having a welding gun head, the welding gun head being annular, having a blanking passage in the middle, the lower end of the blanking passage having a blanking port, and one side of the blanking passage further having a feeding port, a welding wire feeding assembly provided on the moving table and used for feeding welding wire, a welding wire cutting assembly provided on one side of the welding wire feeding assembly and used for cutting welding wire segments, and a material guiding piece provided on one side of the welding wire cutting assembly and used for guiding the welding wire segments cut by the welding wire cutting assembly to the feeding port. The spot welding device for electronic components provided by the present application can adjust the length of the welding wire segments according to actual welding requirements by using the welding wire feeding assembly and the welding wire cutting assembly, and when facing various pin and through-hole sizes on the same circuit board, the feeding amount can be automatically adjusted without frequent manual intervention, the consistency and accuracy of the feeding amount are ensured, and the production efficiency is improved.

A system and method for detecting high aspect ratio micro-holes using optical frequency doubling technology, wherein the micro-hole includes, but is not limited to, a through silicon via (TSV), a through-glass via (TGV), and a through-SiC via (TSiCV). Scanning a fundamental frequency light of a specific wavelength along the axis of the micro-hole to generate strong interface-enhanced frequency-doubled signals at an interface between the micro-hole and another material, (including, but not limited to, air), thereby obtaining a micro-hole geometric structure image characterized by high resolution and visualization, wherein the micro-hole geometric structure image exhibits a high-intensity and distinct interface-enhanced frequency-doubled signal along the contour of the micro-hole, thereby enabling direct visualization of the micro-hole morphology and assessment of the structural quality of the micro-hole. Furthermore, the frequency-doubled signal can be further analyzed to perform high-precision measurement of the hole size, shape, surface roughness, defects, and cracks, which are applicable to process monitoring and quality control of high aspect ratio micro-holes.

The invention discloses a differential shell topology casting composite process adopting hot spot segmentation, which belongs to the technical field of differential shell processing, and comprises the following steps: establishing a differential shell casting blank 3D model based on the actual structure size of a differential shell, a large-wall-thickness area, needing to be subjected to through hole machining subsequently, of the differential shell is determined on the casting blank 3D model; secondly, reserved holes are formed in the positions, corresponding to follow-up through hole machining of the differential mechanism shell, of the casting blank 3D model; 3, a pouring process electronic file is designed, pouring simulation software is used for conducting simulation pouring on the casting blank 3D model with the reserved hole, the structure is analyzed and optimized, a differential shell sand mold is manufactured through 3D printing equipment, the stability and reliability of the sand mold are manufactured and verified in a small batch mode, and the final size of the reserved hole and the corresponding casting blank 3D model are determined; through structural optimization, the defects of shrinkage cavities, shrinkage porosity and the like are eliminated, and the yield and reliability of products are improved.

The application discloses a kind of based on close packing model's concrete low carbonization mix proportion design method, including according to the maximum particle size and the minimum particle size in close packing model obtains the cumulative percentage under each sieve hole;According to the cumulative percentage of each sieve hole size, the volume proportion of each sieve hole size aggregate is obtained, and the mass proportion of corresponding particle size aggregate is obtained;The total specific surface area of the aggregate model is calculated;Combining volume method and specific surface area method, the amount of sand and stone in concrete is calculated;The volume of paste in concrete is calculated from the mass of sand and stone;Initial water-binder ratio is calculated according to the calculation method of ordinary concrete mix proportion design regulation;When mixed with admixture, the water consumption of concrete is calculated;According to the apparent density of each cementitious material and water consumption, the specific amount of each cementitious material is determined;Further realize the mix proportion design of concrete low carbonization, ensure that the performance of concrete is excellent, while achieving the purpose of green environmental protection, energy saving and carbon reduction of concrete.

This invention discloses a flange machining hole size measuring device and method, belonging to the field of flange machining technology. The flange machining hole size measuring device includes a mounting base, and further includes: a positioning measuring mechanism, which is mounted on the mounting base and used to position and measure the flange dimensions; a base, coaxially arranged with the mounting base, and a first elastic telescopic rod rotatably arranged between the base and the mounting base; and multiple abutment plates, evenly arranged circumferentially on the base, with the side of the abutment plate facing away from the mounting base abutting against the flange. This invention completes the detection of inner and outer diameters, bolt hole diameters, roundness, and hole position consistency in a single clamping operation, eliminating the cumulative errors of traditional multi-point independent adjustments and improving measurement efficiency and accuracy.

The utility model relates to the technical field of tool clamps, and discloses a pin gauge clamping tool for rapid inspection of hole size, which comprises an upper clamping plate, the rear end of the upper clamping plate is detachably connected with a lower clamping plate, a hand-screwing bolt is arranged at the through hole of the upper clamping plate and the lower clamping plate, the external of the hand-screwing bolt is in threaded connection with an embedded nut, and the embedded nut is in threaded connection with the lower clamping plate. Needle gauge grooves are formed in the two ends of the sides, close to each other, of the upper clamping plate and the lower clamping plate, needle gauges are placed on the inner walls of the two needle gauge grooves, a butt joint assembly is arranged on the sides, close to each other, of the upper clamping plate and the lower clamping plate, and the butt joint assembly comprises two positioning pin columns; the two positioning pin columns are fixedly connected to the two sides of the rear end of the upper clamping plate respectively. According to the utility model, through the cooperation of the hand-screwed M6 bolt and the M6 hexagon nut, the needle gauge can be rapidly installed and replaced, rapid positioning is realized by combining the automatic positioning pin column, and compared with a traditional hand-held needle gauge detection mode, the detection efficiency is greatly improved.

The utility model relates to the technical field of lamp structure, especially suitable for different wall surface mounting hole size's lamp structure, include: lamp body, install on the lamp body, the crosspiece that a plurality of small holes are formed on the sliding slot, and one end abuts on the sliding of sliding slot and is formed with the convex hull that cooperates small hole clamping positioning, the other end bending and clamping into the spring piece of waiting for installing position, the utility model has the characteristics that the structure is simple, convenient to assemble and can adjust width to adapt to the installation of different opening size of wall surface.

This application discloses a method for repairing concrete foundations of substations, including the following steps: drilling, pile placement, pouring, protection, and curing. The drilling step involves creating a repair hole at the crack in the concrete foundation of the substation, with the hole size larger than the crack size. The pile placement step involves cleaning the inside and surrounding area of ​​the repair hole, inserting a pile into the hole, and positioning the pile to create gaps between the pile and the inner wall of the hole. The pouring step involves injecting filling grout into the repair hole to fully fill the gaps. The protection step involves laying a protective cloth over the repair hole, filling the gaps between the cloth and the concrete foundation, as well as between the cloth and the pile, with filling grout. The curing step involves curing the repaired area. This method for repairing concrete foundations of substations offers fast repair speed, high repair strength, and good corrosion resistance.

A method and system for diagnosing a creep damage and evaluating service life of a dissimilar steel welded joint based on quantitative microscopic characteristics are disclosed and relate to the field of welding damage detection. The method includes: acquiring first experimental data of the dissimilar steel welded joint; quantitatively processing the first experimental data to obtain first quantitative characteristic parameters including a hole size, a volume fraction, and a precipitate size; acquiring second experimental data of the dissimilar steel welded joint; quantitatively processing the second experimental data to obtain second quantitative characteristic parameters including a grain size, a geometric dislocation density, a grain boundary angle, a recrystallization fraction, a recovered grain ratio, and a deformed grain ratio; and determining a current life stage and a remaining creep life of the dissimilar steel welded joint based on the first and second quantitative characteristic parameters.

The utility model discloses a mould structure convenient to quick adjustment of injection moulding product structure, right mould is equipped with left mould on one side correspondingly, and left mould, right mould respectively are inserted on the guide pillar, be equipped with the installation groove on left mould, and place the mounting bracket in the installation groove, be equipped with the mould groove on the mounting bracket, and right mould correspondingly is equipped with mould block. The mounting bracket of this convenient to quick adjustment of injection moulding product structure's through a plurality of first bolt in the installation groove and left mould constitute screw -up locking structure, to through the first bolt to the mounting bracket in left mould carries out quick replacement, and then is convenient to the mould shape of product injection moulding carries out quick adjustment, and the outer wall of the one end of the device injection nozzle is equipped with the thread that fits with respectively in the fixed tube inner wall, and the injection nozzle passes through the fixed tube and the feed pipe and constitutes screw -up locking structure, to can according to mould shape and injection moulding requirement installation corresponding hole size's injection nozzle, so as to guarantee that material can be filled in the mould groove comprehensively.

The invention discloses a method for enhancing the strength of a door opening structure of a ship superstructure, relates to the technical field of ship construction, and solves the problems that the manufacturing cost and the process complexity are increased due to the fact that the strength needs to be compensated by increasing the plate thickness or adopting a complex supporting structure due to the lack of a structure optimization scheme for the problem in the prior art. Comprising the following steps that a temporary reinforcing area is arranged at the bottom of a designed door hole, a strength enhancing scheme is formed, production is conducted according to the strength enhancing scheme, cutting of a steel plate is completed, the cut steel plate is transported to a site, and finally the temporary reinforcing area is cut and recovered to the designed door hole size. The two sides of the temporary reinforcing area extend to the two sides of the designed door hole respectively, and the vertical height difference of the temporary reinforcing area is 200 mm. The problem of steel plate deformation caused by the weak structure of the bottom of the door hole is solved, and the effect of balancing deformation control and production efficiency is achieved by optimizing the connecting height below the door hole and reserving a temporary structure capable of being cut off.

An air bellow middle cover plate assembling structure comprises a front cover plate, a middle cover plate, a rear cover plate and conveying panels, the conveying panels are installed between the middle cover plate and the front cover plate and between the middle cover plate and the rear cover plate, and the middle of the middle cover plate is of a structure with the middle higher than the ends of the two sides. A row of air suction holes are formed in the front inclined face of the middle cover plate at certain intervals, and the air suction device is characterized in that connecting plates are arranged at the two ends of the middle cover plate, the connecting plates and the middle cover plate are fixed into a whole, dovetail grooves are formed in the connecting plates, and air suction holes are formed in the dovetail grooves. A dovetail groove is formed in the middle cover plate, a dovetail groove is formed in the middle cover plate, a protruding block matched with the dovetail groove is arranged below the conveying panel, the protruding block is inserted into the dovetail groove, and an adjusting assembly is installed below the middle cover plate, the adjusting assembly used for adjusting the size of the air suction holes is installed below the middle cover plate, and the number of the air suction holes blocked by the baffle is different by adjusting the position of the baffle. The air suction size of each air suction hole is adjusted through the distance, so that the requirement for conveying paperboards of different sizes is met.

Provided is a method for producing glass that makes it possible to produce glass having a plurality of vias and a good hole shape, and makes it possible to reduce variations in hole size. This method for producing glass having a plurality of vias (140) comprises a step for forming the plurality of vias (140) by etching glass having a modified part (120), and the coefficient of variation in etching temperature after 60 minutes has elapsed from the start of etching is 0.001-0.025.

The utility model belongs to the field of drilling frock, propose a kind of combined drilling frock for drilling machine, including drill jig cover and two frock clamping plate, the middle of frock clamping plate is provided with the threaded hole for installing clamping bolt, and frock clamping plate is provided with workpiece positioning hole and guide positioning hole, and frock clamping plate is provided with 3 around workpiece positioning hole distribution's φ11.5 drill jig hole, the outside of φ11.5 drill jig hole is provided with φ10 drill jig hole, and the guide column that is matched with guide positioning hole is provided between frock clamping plate.The utility model is clamped workpiece by using the two frock clamping plate of upper and lower hole position consistent correspondence, 3 φ11.5 holes on workpiece are simultaneously processed, then φ10 hole is processed, so that multiple hole sizes processing can be completed by once clamping, ensure position degree and position accuracy, satisfy the use requirement of product, improve processing efficiency, and it is reasonable in design, simple structure, low in cost, it is suitable for large-scale popularization.

The application provides a high-delay fracture resistance 1800MPa grade hot forming steel plate and a production method, a hot forming steel component and an application, the composition comprises Si 0.10-0.35%, Mn 0.80-1.20%, Cr 0.10-0.35%, Nb 0.01-0.06%, Mo 0.05-0.25%, Mn+Cr+Si≤1.60%, Nb / N≤50; compared with the prior art, the application controls the base body chemical composition, production control, thereby controlling the base body surface layer oxidation state before hot forming, the thickness fluctuation of FeAlSi inhibition layer, finally controlling the Cottrell hole size and quantity after hot forming; adding micro-alloying elements to refine the martensite structure, controlling hydrogen content and hydrogen absorption reaction in the heating process of hot forming, finally controlling the diffusible hydrogen content in the hot forming steel component, and ensuring that the hot forming steel component has high-delay fracture resistance, cold bending performance and coating corrosion resistance.

This utility model relates to the field of drilling device technology and discloses a drilling device for an LCD screen. It solves the problems of existing drilling devices, such as inconvenient drill bit assembly and disassembly, inability to quickly change drill bits according to the required hole size, and poor performance. The device includes a worktable, with a vacuum suction cup fixedly installed in the middle. A support frame is fixedly installed at one end of the top of the worktable, and an electric push rod is fixedly installed on the top of the support frame. A drive motor is fixedly installed at the transmission end of the electric push rod, and a docking block is fixedly installed at the output end of the drive motor. A limit sleeve is fixedly installed on the surface of the drive motor, and a limit rod is inserted into the inside of the limit sleeve. The top of the limit rod is fixedly connected to the inner bottom of the support frame. A handwheel is provided on the lower part of one side of the docking block. This drilling device makes drill bit assembly and disassembly very convenient, allowing for quick replacement of different drill bits according to the required hole size, resulting in excellent performance.

The utility model provides a kind of insulating support, including support body and limit sleeve;The support body is equipped with the Chinese character "ge" buckle, center column and stop step;The Chinese character "ge" buckle and center column of support can pass through shell through-hole, and the outer dimension of stop step is larger than shell through-hole size, and it can sink into the counterbore of shell;Limit sleeve and support center column are interference fit, and the lower end surface of limit sleeve and support stop step form clamping effect, so as to fix entire insulating support on shell.The insulating support is simple in structure, easy to install;It is reliable in fixing, and strong in impact resistance;It is small in board space, which is beneficial to product miniaturization.

The invention relates to the technical field of machining and manufacturing, in particular to a simulation calculation and determination method for the size of a prefabricated hole in a hole drawing process, which comprises a modeling stage, a calculation stage and a determination stage. And a modeling stage: according to the preset sizes of the actual main pipe and the target branch pipe, establishing geometric models of the simulation main pipe and the simulation branch pipe, setting the thermal expansion coefficient of the simulation branch pipe as a negative value, and setting a thermal boundary condition for the simulation branch pipe to input heat to the simulation branch pipe. In the calculation stage, the simulation branch pipes are heated to shrink towards the roots of the simulation branch pipes to form through holes in the simulation main pipe. In the determining stage, the size of the through hole is obtained and serves as the size of the prefabricated hole formed in the actual main pipe in the hole pulling test. According to the simulation calculation determination method for the size of the prefabricated hole in the hole drawing process, a reverse design thought is adopted, the simulation branch pipe is reversely shrunk to finally obtain the predicted size of the prefabricated hole, and a test is performed according to the predicted size, so that the cost can be reduced, and the efficiency can be improved.