CN116616883A - Pure magnesium metal bone screw and processing technology thereof - Google Patents
Pure magnesium metal bone screw and processing technology thereof Download PDFInfo
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- CN116616883A CN116616883A CN202310900312.7A CN202310900312A CN116616883A CN 116616883 A CN116616883 A CN 116616883A CN 202310900312 A CN202310900312 A CN 202310900312A CN 116616883 A CN116616883 A CN 116616883A
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 205
- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 36
- 238000012545 processing Methods 0.000 title claims abstract description 32
- 238000005516 engineering process Methods 0.000 title claims abstract description 10
- 238000001125 extrusion Methods 0.000 claims description 109
- 229910052749 magnesium Inorganic materials 0.000 claims description 71
- 239000011777 magnesium Substances 0.000 claims description 71
- 238000000034 method Methods 0.000 claims description 50
- 238000005520 cutting process Methods 0.000 claims description 27
- 239000011295 pitch Substances 0.000 claims description 26
- 241000587161 Gomphocarpus Species 0.000 claims description 22
- 239000012535 impurity Substances 0.000 claims description 19
- 239000000314 lubricant Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000007514 turning Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000003960 organic solvent Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 7
- 238000005242 forging Methods 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 6
- 238000011282 treatment Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 150000002576 ketones Chemical class 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000001356 surgical procedure Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 21
- 238000013461 design Methods 0.000 description 11
- 239000000047 product Substances 0.000 description 8
- 238000003754 machining Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000004381 surface treatment Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000007857 degradation product Substances 0.000 description 3
- 239000002861 polymer material Substances 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- XVYHFPMIBWTTLH-UHFFFAOYSA-N [Zn].[Mg].[Ca] Chemical compound [Zn].[Mg].[Ca] XVYHFPMIBWTTLH-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 238000004439 roughness measurement Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/866—Material or manufacture
Abstract
The application provides a pure magnesium metal bone screw and a processing technology thereof, relating to the technical field of medical surgery.
Description
Technical Field
The application relates to the technical field of medical surgery, in particular to a pure magnesium metal bone screw and a processing technology thereof.
Background
With the development of the trauma orthopaedics appliance industry, more and more absorbable implantation products enter the orthopaedics appliance market, the current absorbable materials are divided into a high polymer material and a magnesium metal material, the absorbable high polymer material can be degraded and absorbed after being implanted into a human body, the secondary operation can be avoided, but the mechanical strength of the material is insufficient as a fracture internal fixation material of a bearing part, and the degradation products can cause local acidity to trigger inflammatory reaction, the magnesium metal material has higher mechanical property compared with the high polymer material, the fixing or supporting mechanical requirement can be met, and the degradation products magnesium ions of the magnesium metal are fourth large cations in the human body, and excessive magnesium can be discharged out of the body along with the metabolism of the human body, so that the magnesium ion orthopedic orthopaedics appliance has a biosafety foundation.
In structural design direction, current bone screw design often is simple gradually tight helicitic texture to reach and implant fixed effect, but this kind of structural design is driving into the in-process, does not possess the self-repairing function to the angle, and after implanting, based on each direction atress influence, causes the influence to implanting stability easily, on self structure, current screw often adopts integrated design, to bone screw practical application condition, can not nimble allotment length and used screw, has caused the influence to its flexibility of use.
The rare earth magnesium alloy lag screw and the magnesium zinc calcium screw have been developed by the existing company, the research and development are magnesium alloy screws, the mechanical properties of the magnesium alloy materials are higher, but the components are complex, degradation products in the human body are more, the metabolism of the human body is not facilitated, the biological safety of the high-purity magnesium screws is better, but the mechanical properties of the high-purity magnesium materials are poorer, the screw tap is needed to be used for pre-tapping before the screws are implanted to ensure that the screws are not damaged in the screwing process, the complexity of operation is increased, the fixing effect after the screws are implanted is poorer, the fracture fixation is not facilitated, in addition, the degradation rate of the high-purity magnesium is faster, the mechanical properties required in the early degradation period are difficult to maintain, the mechanical properties of the pure magnesium metal screws can be improved by optimizing the overall structure of the screws, the performance of the screws can be improved by improving the performance of raw material magnesium rods, the common extrusion process can refine grains of the pure magnesium materials, but the performance can be limited due to the uneven grains, and the degradation rate of the pure magnesium after extrusion is still fast.
Disclosure of Invention
The application aims to solve the defects in the prior art and provides a pure magnesium metal bone screw and a processing technology thereof.
In order to achieve the above purpose, the present application adopts the following technical scheme: a pure magnesium metal bone screw consists of a nail head assembly, a first section of threaded shaft, a second section of threaded shaft, a third section of threaded shaft and a nut assembly; the nail head assembly comprises a nail head main body, wherein a first thread is arranged on the outer surface of the nail head main body, the nail head main body is of a pointed structure, and the bottom diameter and the diameter are gradually increased; the first threaded shaft comprises a first threaded shaft main body, the outer surface of the first threaded shaft main body is provided with second threads, the pitches of the second threads are distributed gradually, the initial pitches of the second threads are 0.5mm, and the final pitches of the second threads are 1.5mm; the second-section threaded shaft comprises a second threaded shaft main body, the outer surface of the second threaded shaft main body is provided with third threads, the third threads are arranged into structures with the diameters of adjacent threads being spaced at intervals, and the pitch of the third threads is 0.75mm; the three-section threaded shaft comprises a third threaded shaft, the outer surface of the third threaded shaft is provided with fourth threads, the pitches of the fourth threads are distributed gradually, the initial pitches of the fourth threads are 0.6mm, and the final pitches of the fourth threads are 0.025mm; the nut assembly comprises a nut main body, and a plum blossom groove is formed in the rear end of the nut main body.
As a further scheme of the application, a first inner screw hole is formed in the rear end of the nail head main body, a first inner screw is arranged at the front end of the first threaded shaft main body, a second inner screw is formed in the rear end of the first threaded shaft main body, a second inner screw is arranged at the front end of the second threaded shaft main body, a third inner screw is formed in the rear end of the second threaded shaft main body, a third inner screw is arranged at the front end of the third threaded shaft, a fourth inner screw is formed in the rear end of the third threaded shaft, and a fourth inner screw is arranged at the front end of the nut main body.
As a further scheme of the application, the first inner screw hole, the second inner screw hole, the third inner screw hole and the fourth inner screw hole are meshed with the first inner screw rod, the second inner screw rod, the third inner screw rod and the fourth inner screw rod.
As a further scheme of the application, the raw materials of the nail head assembly, the first-section threaded shaft, the second-section threaded shaft, the third-section threaded shaft and the nut assembly adopt 99.99% pure magnesium metal bars, and the pure magnesium metal bars are obtained by multi-pass extrusion of as-cast pure magnesium ingots.
A processing technology of a pure magnesium metal bone screw comprises the following steps:
s1: selecting 99.99% pure magnesium cast ingot as raw material;
s2: preparing a pure magnesium rod blank phi 100mm;
s3: the first extrusion to obtain a pure magnesium rod phi 35mm;
s4: preparing a pure magnesium rod blank phi 30mm;
s5: extruding for the second time to obtain a pure magnesium rod phi 10mm;
s6: and (5) processing the pure magnesium rod phi 10mm obtained in the step S5 into a pure magnesium screw by a numerical control processing method.
As a further scheme of the application, in the step S2, the preparation of the pure magnesium rod blank phi 100mm comprises the following steps:
s201: processing the 99.99% pure magnesium cast ingot obtained in the step S1, heating the cast ingot to 350-450 ℃, and changing the shape of the cast ingot into a cylinder with the diameter of 100mm by forging or extrusion;
s202: grinding by sand paper to clean the magnesium cylindrical oxide layer or other impurities;
s203: checking and measuring the magnesium cylinder to ensure that the diameter of the magnesium cylinder is 100mm, and the surface of the magnesium cylinder is smooth and free of impurities;
s204: and cooling the processed magnesium cylinder, and then storing the magnesium cylinder to wait for the next extrusion treatment.
As a further scheme of the application, in the step S3, the step of obtaining the pure magnesium rod phi 35mm by the first extrusion is specifically as follows:
s301: preparing an extrusion cylinder with the diameter of 100mm, setting the diameter of a reducing area to be 35mm, and setting the extrusion ratio to be 8.16;
s302: preheating the extrusion cylinder to the temperature range of 250-300 ℃ for 2h, and synchronously preheating the pure magnesium rod blank to the temperature range of 250-300 ℃ for 2h;
s303: after preheating, uniformly coating graphite lubricant on the pure magnesium rod blank;
s304: placing the pure magnesium rod blank coated with the lubricant into a preheated extrusion barrel, and then starting extrusion, wherein the extrusion temperature is 350-400 ℃, the extrusion speed is 5-8 mm/s, and the extrusion force is 10-20 MPa;
s305: the extruded pure magnesium rod billet is taken out of the extrusion barrel and allowed to cool naturally.
As a further scheme of the application, in the step S4, the preparation of the pure magnesium rod blank phi 30mm comprises the following steps:
s401: selecting a CNC lathe and a hard alloy cutter, setting the cutting speed to be 60-200m/min, the feedback depth to be 0.5-1.5mm, the feeding speed to be 0.1-0.4mm/rev and the rotating speed to be 200-2000rpm;
s402: in the turning process, stable movement of the sliding table is ensured, and each cutting route is accurately measured according to the shape and the size of the cutter;
s403: checking the diameter of the finished workpiece by adopting a digital display vernier caliper or a high-precision micrometer;
s404: selecting alcohol or ketone organic solvent, soaking at normal temperature of 30-35deg.C for 10-20min, and cleaning with force applied by brush during cleaning;
s405: washing the organic solvent, and rapidly drying the obtained pure magnesium rod blank phi 30mm by using a drying device, wherein the internal temperature of the drying device is set to 55-60 ℃.
As a further scheme of the application, in the step S5, the step of obtaining the pure magnesium rod phi 10mm through the second extrusion is specifically as follows:
s501: preparing an extrusion cylinder with the diameter of 30mm, and setting the diameter of a reducing area to be 10mm;
s502: preheating a pure magnesium rod blank phi 30mm and a die together, wherein the preheating temperature is 300-400 ℃ and the preheating time is 4 hours;
s503: setting the extrusion temperature in the range of 400-500 ℃, and applying extrusion force to push the pure magnesium rod to pass through the extrusion barrel and form a required shape, wherein the extrusion speed is 3-6 mm/s, and the extrusion force is 30-60 MPa;
s504: taking out the extruded pure magnesium rod from the extrusion barrel, naturally cooling, removing surface lubricant and oxide, and finishing the surface.
As a further scheme of the application, in the step S6, the step of processing the pure magnesium rod phi 10mm obtained in the step S5 into the pure magnesium screw by a numerical control processing method comprises the following steps:
s601: setting parameters of a numerical control machine tool, wherein the rotating speed is 800-3000rpm, the feeding speed is 1-3 mm/s, and the cutting depth is 0.1-1mm;
s602: the method comprises the steps of stably fixing a pure magnesium rod phi 10mm in a clamp to avoid vibration and error, and writing a machining program of a numerical control machine tool according to the size and geometric characteristics of the pure magnesium metal bone screw, wherein the machining program comprises a cutting path, a movement track of a cutter, the relative position of the cutter track and a workpiece, cutting parameters and the like;
s603: starting a numerical control machine tool, and turning according to a written machining program;
s604: and removing the surface lubricant and oxide, and detecting roughness and tensile strength, so as to ensure that the surface roughness is between Ra0.4 and Ra0.8mm and the tensile strength is between 190MPa and 210 MPa.
Compared with the prior art, the application has the advantages and positive effects that:
in the structural design of the nail head component, due to the gradual increase of the bottom diameter and the diameter, the stability of the screw can be self-locked in the screwing-in process, the screw is improved, the screw pitch of the second thread is gradually increased, the screw placement pose can be adjusted in the driving process, the screw pitch of the fourth thread is gradually reduced, the driving path can be stabilized in the driving process, deflection and deviation are reduced, the screw can be safely and firmly fixed on a target object, and the structure with the adjacent thread diameters at high and low intervals is adopted in the third thread, so that the screw can have different tensile and compressive properties at different depths in the screwing-in process, and a more stable fixing effect is provided.
The 99.99% pure magnesium cast ingot is selected as the raw material, so that good biocompatibility of the product can be ensured, and the influence of possible impurities on the performance of the screw is reduced. The shape of the pure magnesium rod is gradually changed by compressing the pure magnesium rod from phi 100mm to phi 10mm through twice extrusion, so that the internal stress or damage of the material caused by overlarge primary deformation can be effectively avoided. The extrusion process is required to be performed within a specific temperature range, and too high or too low a temperature may cause a loss of properties of the material. This can avoid the generation of micro cracks or burrs by ensuring the uniformity of extrusion, thereby improving the quality of the extrusion. By adopting the numerical control processing method, the screw with complex shape and size can be manufactured under the premise of high precision and high repeatability. This step ensures the specific dimensions of the screws and the consistency of each screw. After each step is finished, the magnesium rod is cleaned and dried to remove the oxide layer and other impurities on the surface. This step ensures the purity of the material and improves the biocompatibility of the product. Based on the corresponding data of temperature control and cooling, cooling of the screw is controlled to prevent heat generated during forging from affecting the properties of the material.
Drawings
FIG. 1 is a schematic diagram showing the overall structure of a pure magnesium metal bone screw and a processing technique thereof;
FIG. 2 is a schematic diagram showing the combination of components 1 and 5 of a pure magnesium metal bone screw and a processing technique thereof;
FIG. 3 is a schematic view showing the combination of components 1, 3 and 5 of a pure magnesium metal bone screw and its processing technique;
FIG. 4 is a schematic view showing the combination of components 1, 3, 4 and 5 of a pure magnesium metal bone screw and its processing technique;
FIG. 5 is a schematic view of a nail head assembly of a pure magnesium metal bone screw and a process for manufacturing the same according to the present application;
FIG. 6 is a schematic view of a section of threaded shaft of a pure magnesium metal bone screw and a process for manufacturing the same according to the present application;
FIG. 7 is a schematic view of a two-stage threaded shaft of a pure magnesium metal bone screw and a process for manufacturing the same according to the present application;
FIG. 8 is a schematic view of a three-section threaded shaft of a pure magnesium metal bone screw and a process for manufacturing the same according to the present application;
FIG. 9 is a schematic view of a nut assembly of a pure magnesium metal bone screw and a process for manufacturing the same according to the present application;
fig. 10 is an overall flow chart of a pure magnesium metal bone screw and a processing technique thereof according to the present application.
In the figure: 1. a stud assembly; 101. a pin head main body; 102. a first thread; 103. a first inner screw hole;
2. a threaded shaft; 201. a first threaded shaft body; 202. a second thread; 203. a first inner screw; 204. a second inner screw hole;
3. a two-section threaded shaft; 301. a two-thread shaft main body; 302. a third thread; 303. a second inner screw; 304. a third inner screw hole;
4. a three-section threaded shaft; 401. a third threaded shaft; 402. a fourth thread; 403. a third inner screw; 404. a fourth inner screw hole;
5. a nut assembly; 501. a nut body; 502. a fourth inner screw; 503. plum blossom groove.
Detailed Description
In order that the above objects, features and advantages of the application will be more clearly understood, a further description of the application will be rendered by reference to the appended drawings and examples. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, in the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
Referring to fig. 1 to 9, a pure magnesium metal bone screw is composed of a nail head assembly 1, a first section of threaded shaft 2, a second section of threaded shaft 3, a third section of threaded shaft 4 and a nut assembly 5; the nail head assembly 1 comprises a nail head main body 101, wherein a first thread 102 is arranged on the outer surface of the nail head main body 101, the nail head main body 101 is of a pointed structure, and the bottom diameter and the diameter are gradually increased; the first section of threaded shaft 2 comprises a first threaded shaft main body 201, a second thread 202 is arranged on the outer surface of the first threaded shaft main body 201, the pitches of the second thread 202 are distributed gradually, the initial pitch of the second thread 202 is 0.5mm, and the final pitch of the second thread 202 is 1.5mm; the second-section threaded shaft 3 comprises a second threaded shaft main body 301, wherein a third thread 302 is arranged on the outer surface of the second threaded shaft main body 301, the third thread 302 is arranged in a structure with the diameters of adjacent threads being spaced at intervals, and the pitch of the third thread 302 is 0.75mm; the three-section threaded shaft 4 comprises a third threaded shaft 401, the outer surface of the third threaded shaft 401 is provided with fourth threads 402, the pitches of the fourth threads 402 are distributed gradually, the initial pitches of the fourth threads 402 are 0.6mm, and the final pitches of the fourth threads 402 are 0.025mm; the nut assembly 5 includes a nut body 501, and a plum blossom groove 503 is formed at the rear end of the nut body 501.
Specifically, in the bone screw structural design direction, adopt the design of multistage screw thread, can select suitable pitch and section number to customize the function and the performance of screw according to specific demand, promote based on the flexibility and the specialty of application scene, in the structural design of pin head subassembly 1, owing to the gradual increase of base diameter and diameter, can lock by oneself at the screw in-process, improve the stability of screw, and the pitch of No. two screw threads 202 is crescent, make and can put into the position and position to the screw and adjust in the driving-in process, the pitch of No. four screw threads 402 is crescent, such design can be in the driving-in process stable driving-in route, reduce skew and deviation, make the screw can be safely, firmly fixed on the target object, adopt the structure of adjacent screw diameter height interval in No. three screw threads 302, make the screw can have different tensile and compressive property at different degree of depth in the screw in-process, thereby provide more steady fixed effect.
The pure magnesium screw can be biodegraded in vivo after the function is completed, thereby avoiding secondary operation. The traditional titanium alloy screw is usually simple in preparation process, and the titanium alloy bar is directly processed into the screw through processes such as turning, drilling or grinding. The preparation of the pure magnesium screw has more technical content, and through the steps of twice extrusion, CNC processing and the like, the precision and consistency of the screw are ensured, and the microstructure and performance of the magnesium material are also ensured. During the treatment process, titanium alloy screws often require surface treatments (such as acid washing or ball blasting) to improve biocompatibility and corrosion resistance. Pure magnesium screws do not require these processing steps, since pure magnesium itself has good biocompatibility and degradability.
Referring to fig. 5 to 9, a first inner screw hole 103 is formed in the rear end of the nail head main body 101, a first inner screw 203 is mounted at the front end of the first screw shaft main body 201, a second inner screw 204 is formed in the rear end of the first screw shaft main body 201, a second inner screw 303 is mounted at the front end of the second screw shaft main body 301, a third inner screw 304 is formed at the rear end of the second screw shaft main body 301, a third inner screw 403 is mounted at the front end of the third screw shaft 401, a fourth inner screw 404 is formed at the rear end of the third screw shaft 401, a fourth inner screw 502 is mounted at the front end of the nut main body 501, and the first inner screw 103, the second inner screw 204, the third inner screw 304 and the fourth inner screw 404 are meshed with the first inner screw 203, the second inner screw 303, the third inner screw 403 and the fourth inner screw 502.
Specifically, through the free combination of different screw shafts and nuts to adapt to different demands and application situations, select suitable screw shaft and nut combination according to the specific situation, in order to realize required parameter and performance, through using interior screw hole and interior screw rod to freely combine, the connection between screw shaft and the nut can be more nimble and adjustable, and this kind of design has nimble equipment, adjustability and interchangeability, provides more selections and possibility to adapt to different demands and application situations.
Referring to fig. 1, the raw materials of the pin head assembly 1, the first-stage threaded shaft 2, the second-stage threaded shaft 3, the third-stage threaded shaft 4 and the nut assembly 5 are 99.99% pure magnesium metal bars, and the pure magnesium metal bars are obtained by multi-pass extrusion of as-cast pure magnesium ingots.
Specifically, 99.99% of pure magnesium metal bar is selected as a raw material, so that the high purity and high quality performance of the screw assembly are ensured, the good biocompatibility of the product can be ensured, and the influence of possible impurities on the screw performance is reduced. The high-purity pure magnesium metal can reduce the content of impurities and inclusions, improve the material strength and corrosion resistance of the screw, process an as-cast pure magnesium ingot into a pure magnesium metal bar through multi-pass extrusion, and adopt the pure magnesium metal bar subjected to multi-pass extrusion as a raw material, so that a uniformly distributed fine grain structure can be obtained. Such fine grain structure may increase the strength, hardness, and tensile strength of the screw. Compared with the traditional preparation method, the pure magnesium metal bar prepared by using the multi-pass extrusion process can improve the mechanical property and reliability of the screw, and the high-purity pure magnesium metal and fine-grain tissue structure can improve the corrosion resistance of the screw. This is particularly important for the application of pure magnesium metal in specific environments, which can increase the service life and stability of the screw.
Referring to fig. 10, a processing technology of a pure magnesium metal bone screw comprises the following steps:
s1: selecting 99.99% pure magnesium cast ingot as raw material;
s2: preparing a pure magnesium rod blank phi 100mm;
s3: the first extrusion to obtain a pure magnesium rod phi 35mm;
s4: preparing a pure magnesium rod blank phi 30mm;
s5: extruding for the second time to obtain a pure magnesium rod phi 10mm;
s6: and (5) processing the pure magnesium rod phi 10mm obtained in the step S5 into a pure magnesium screw by a numerical control processing method.
Specifically, a 99.99% pure magnesium ingot is selected as a raw material, so that good biocompatibility of a product can be ensured, and influence of possible impurities on screw performance is reduced. The shape of the pure magnesium rod is gradually changed by compressing the pure magnesium rod from phi 100mm to phi 10mm through twice extrusion, so that the internal stress or damage of the material caused by overlarge primary deformation can be effectively avoided. The extrusion process is required to be performed within a specific temperature range, and too high or too low a temperature may cause a loss of properties of the material. This can avoid the generation of micro cracks or burrs by ensuring the uniformity of extrusion, thereby improving the quality of the extrusion. By adopting the numerical control processing method, the screw with complex shape and size can be manufactured under the premise of high precision and high repeatability. This step ensures the specific dimensions of the screws and the consistency of each screw. After each step is finished, the magnesium rod is cleaned and dried to remove the oxide layer and other impurities on the surface. This step ensures the purity of the material and improves the biocompatibility of the product. Based on the corresponding data of temperature control and cooling, cooling of the screw is controlled to prevent heat generated during forging from affecting the properties of the material.
Referring to fig. 10, in S2, the steps for preparing the pure magnesium rod blank phi 100mm are specifically:
s201: processing the 99.99% pure magnesium cast ingot obtained in the step S1, heating the cast ingot to 350-450 ℃, and changing the shape of the cast ingot into a cylinder with the diameter of 100mm by forging or extrusion;
s202: grinding by sand paper to clean the magnesium cylindrical oxide layer or other impurities;
s203: checking and measuring the magnesium cylinder to ensure that the diameter of the magnesium cylinder is 100mm, and the surface of the magnesium cylinder is smooth and free of impurities;
s204: and cooling the processed magnesium cylinder, and then storing the magnesium cylinder to wait for the next extrusion treatment.
Specifically, first, the ingot is heated to a temperature in the range of 350 to 450 ℃. Heating the magnesium ingot may make it more plastic, facilitating further processing. The shape of the ingot can then be changed to a cylinder 100mm in diameter using forging or extrusion. This step may be accomplished by applying pressure to the magnesium ingot to form it into the desired shape in a particular mold or apparatus. The magnesium cylinder is sanded with sand paper to remove oxide layers or other impurities on the surface of the magnesium cylinder. The oxide layer is a thin layer formed by the reaction of magnesium with oxygen in the air, which may affect the properties of the material. By polishing with sandpaper, oxide layers and other impurities can be removed from the surface of the magnesium cylinder, so that the surface of the magnesium cylinder is smoother and cleaner. The machined and cleaned magnesium cylinders were inspected and measured. This step was to ensure that the diameter of the magnesium cylinder reached 100mm and that the surface was smooth and free of impurities. The diameter of the magnesium cylinder may be measured using a suitable measuring tool, such as a caliper or a microscope, and visually inspected to ensure that the surface is free of impurities or defects. And cooling the processed magnesium cylinder, and then storing the magnesium cylinder to wait for the next extrusion treatment. By working the ingot into a cylindrical shape, cleaning the oxide layer and impurities, ensuring the size and surface quality, and proper cooling and storage, a magnesium cylinder with the desired size and surface quality can be obtained. The beneficial effects of these steps include providing proper workpiece shape, improving surface quality, ensuring dimensional accuracy, and protecting material stability, thereby laying the foundation for subsequent processing.
Referring to fig. 10, in S3, the steps for obtaining a pure magnesium rod phi 35mm by the first extrusion are specifically:
s301: preparing an extrusion cylinder with the diameter of 100mm, setting the diameter of a reducing area to be 35mm, and setting the extrusion ratio to be 8.16;
s302: preheating the extrusion cylinder to the temperature range of 250-300 ℃ for 2h, and synchronously preheating the pure magnesium rod blank to the temperature range of 250-300 ℃ for 2h;
s303: after preheating, uniformly coating graphite lubricant on the pure magnesium rod blank;
s304: placing the pure magnesium rod blank coated with the lubricant into a preheated extrusion barrel, and then starting extrusion, wherein the extrusion temperature is 350-400 ℃, the extrusion speed is 5-8 mm/s, and the extrusion force is 10-20 MPa;
s305: the extruded pure magnesium rod billet is taken out of the extrusion barrel and allowed to cool naturally.
Specifically, the extrusion processing of the pure magnesium rod can be realized and the ideal diameter and quality can be obtained by controlling the design and parameters of the extrusion barrel, carrying out the preheating operation, adopting the lubricant for coating, controlling the extrusion temperature, speed and strength and carrying out the cooling treatment. The beneficial effects of these steps include ensuring uniform heating, reducing friction losses, controlling extrusion parameters, increasing the strength and density of the pure magnesium rod, and ensuring process stability and consistency. The diameter, extrusion ratio, preheating temperature, preheating time, extrusion temperature, extrusion rate, extrusion force and the like of the extrusion barrel are all set with definite values, the whole preparation process can be highly controlled, the important influence on the quality and consistency of the product is achieved, and after the preheating is finished, the graphite lubricant is smeared, so that friction in the preparation process is reduced, and the yield and the consistency of the product are improved. After extrusion is completed, the pure magnesium rod blank is naturally cooled, so that the input of additional energy sources can be reduced.
Referring to fig. 10, in S4, the steps for preparing the pure magnesium rod blank phi 30mm are specifically:
s401: selecting a CNC lathe and a hard alloy cutter, setting the cutting speed to be 60-200m/min, the feedback depth to be 0.5-1.5mm, the feeding speed to be 0.1-0.4mm/rev and the rotating speed to be 200-2000rpm;
s402: in the turning process, stable movement of the sliding table is ensured, and each cutting route is accurately measured according to the shape and the size of the cutter;
s403: checking the diameter of the finished workpiece by adopting a digital display vernier caliper or a high-precision micrometer;
s404: selecting alcohol or ketone organic solvent, soaking at normal temperature of 30-35deg.C for 10-20min, and cleaning with force applied by brush during cleaning;
s405: washing the organic solvent, and rapidly drying the obtained pure magnesium rod blank phi 30mm by using a drying device, wherein the internal temperature of the drying device is set to 55-60 ℃.
Specifically, the CNC lathe is a computer numerical control machine tool, and can precisely control the movement and machining process of a tool through a preset program. Cemented carbide tools are commonly used for machining materials with a certain hardness, such as magnesium. When the cutting parameters are set, the cutting speed is in the range of 60-200m/min, the feedback depth is 0.5-1.5mm, the feeding speed is 0.1-0.4mm/rev, and the rotating speed is 200-2000rpm. The selection of these parameters can be adjusted according to specific processing requirements and practical conditions.
It is very important to ensure smooth movement of the slipway during turning. The smooth sliding table movement can avoid the quality degradation of the processing surface caused by vibration or unstable movement. Furthermore, each cutting path should be measured accurately according to the shape and size of the cutter used. This ensures that the cutting tool contacts the workpiece surface to the desired position and depth to ensure machining accuracy and consistency.
The diameter of the finished workpiece is verified by using a measuring tool such as a digital display vernier caliper or a high-precision micrometer. These tools have high measurement accuracy and can provide accurate dimensional measurements. By measuring the diameter of the workpiece, it is ensured that it is consistent with the diameter of the desired specification, and making the necessary adjustments or corrections.
Alcohol or ketone organic solvents are selected to clean the workpiece. The organic solvents have better dissolving capacity and can effectively remove impurities and pollutants on the surface of a workpiece. The temperature of 30-35 ℃ is a proper cleaning temperature range. The work piece may be immersed in the organic solvent for 10-20 minutes to ensure thorough cleaning. During cleaning, the surface of the workpiece may be cleaned with a brush with moderate force to help remove tough contaminants.
The organic solvent is rinsed to remove residual solvents and impurities. Ensuring the surface of the workpiece to be clean. Then, the obtained pure magnesium rod blank phi 30mm is put into a drying device for quick drying. The internal temperature is set to 55-60 c to provide proper drying conditions to ensure thorough drying of the workpiece. After drying, the pure magnesium rod blank can enter the next processing or using stage.
By properly setting cutting parameters, ensuring stable movement of a sliding table, measuring and verifying the diameter of a workpiece, cleaning by an organic solvent, quick drying and the like, a pure magnesium rod blank with the diameter of 30mm can be obtained.
Referring to fig. 10, in S5, the step of obtaining a pure magnesium rod Φ10mm by the second extrusion is specifically:
s501: preparing an extrusion cylinder with the diameter of 30mm, and setting the diameter of a reducing area to be 10mm;
s502: preheating a pure magnesium rod blank phi 30mm and a die together, wherein the preheating temperature is 300-400 ℃ and the preheating time is 4 hours;
s503: setting the extrusion temperature in the range of 400-500 ℃, and applying extrusion force to push the pure magnesium rod to pass through the extrusion barrel and form a required shape, wherein the extrusion speed is 3-6 mm/s, and the extrusion force is 30-60 MPa;
s504: taking out the extruded pure magnesium rod from the extrusion barrel, naturally cooling, removing surface lubricant and oxide, and finishing the surface.
Specifically, an extrusion cylinder having a diameter of 30mm was prepared, which was used to extrude a pure magnesium rod billet phi 30mm into a shape phi 10 mm. The diameter of the reducing region of the extrusion barrel needs to be set to 10mm to ensure that the required diameter reduction of the pure magnesium rod can be achieved during extrusion.
The pure magnesium rod blank phi 30mm is preheated together with the die. The purpose of the preheating is to increase the plasticity of the material so that it can be more easily formed into the desired shape by the extrusion process. The preheating temperature is typically in the range of 300 ℃ to 400 ℃ and the preheating time needs to last for 4 hours to ensure a sufficiently uniform heating of the material.
The extrusion temperature was set in the range of 400 to 500 ℃. This temperature range allows the pure magnesium rod to reach a suitable plasticity to form a phi 10mm shape by the extrusion process. Meanwhile, the extrusion rate is set to be between 3mm/s and 6mm/s according to practical conditions. The application of the appropriate compressive force may push the pure magnesium rod through the extrusion barrel and shape it into the desired shape.
Natural cooling can enable the pure magnesium rod to recover stable structure and shape at room temperature. At the same time, removal of surface lubricants and oxides is required. This may be achieved by a suitable cleaning method, such as brushing or wiping. And finally, the surface of the pure magnesium rod needs to be trimmed, so that the evenness, smoothness and meeting requirements of the pure magnesium rod are ensured.
By properly designing and setting parameters of the extrusion barrel, performing preheating operation, controlling extrusion parameters, and then performing natural cooling and surface treatment after extrusion, a pure magnesium rod with the diameter of 10mm can be obtained, and the beneficial effects of the steps include ensuring the dimensional accuracy of the pure magnesium rod, improving the surface quality, removing lubricants and oxides, and finishing the surface, and the process provides a basis for obtaining the high-quality pure magnesium rod and can be used in the subsequent processing and application fields.
Referring to fig. 10, in S6, the steps of processing the pure magnesium rod phi 10mm obtained in S5 into a pure magnesium screw by a numerical control processing method specifically include:
s601: setting parameters of a numerical control machine tool, wherein the rotating speed is 800-3000rpm, the feeding speed is 1-3 mm/s, and the cutting depth is 0.1-1mm;
s602: the method comprises the steps of stably fixing a pure magnesium rod phi 10mm in a clamp to avoid vibration and error, and writing a machining program of a numerical control machine tool according to the size and geometric characteristics of the pure magnesium metal bone screw, wherein the machining program comprises a cutting path, a movement track of a cutter, the relative position of the cutter track and a workpiece, cutting parameters and the like;
s603: starting a numerical control machine tool, and turning according to a written machining program;
s604: and removing the surface lubricant and oxide, and detecting roughness and tensile strength, so as to ensure that the surface roughness is between Ra0.4 and Ra0.8mm and the tensile strength is between 190MPa and 210 MPa.
Specifically, according to the size and geometric characteristics of the required pure magnesium metal bone screw, the machining program of the numerical control machine tool is written. The machining program should include information such as cutting path, movement path of the tool, relative position of the tool and the workpiece, and cutting parameters. The written machining program guides the numerical control machine to conduct specific turning operation.
And starting the numerical control machine tool, and performing turning operation according to the previously written machining program. The numerical control machine tool automatically controls the movement and the machining process of the cutter according to the program instruction. Ensure the stable operation of the machine tool and closely monitor the machining process to ensure the accuracy and quality of machining.
Surface roughness measurements are performed to ensure a satisfactory range. The roughness index is usually Ra value, which is ensured in the range of 0.4-0.8. Mu.m. At the same time, tensile strength test was performed to verify its mechanical properties. Ensures that the tensile strength is in the required range of 190MPa to 210MPa, and meets the specified standard or requirement.
The method has the advantages that the method can process the pure magnesium rod phi 10mm into the pure magnesium screw meeting the requirements through parameter setting, stable workpiece fixing, programming and machining program, turning operation and finishing surface treatment and quality detection of the numerical control machine tool, and the beneficial effects of the steps include high-precision machining, optimized surface quality, roughness and tensile strength meeting the requirements, and ensuring the dimensional accuracy and quality stability of the screw.
Working principle: firstly, preparing a starting material, selecting a pure magnesium blank, preprocessing according to requirements, such as heating and preheating, then, extruding the pure magnesium blank by utilizing an extrusion technology, using an extrusion cylinder with the diameter of 30mm, setting the diameter of a reducing area to be 10mm, pushing the pure magnesium blank through the extrusion cylinder by controlling extrusion temperature, speed and strength to form a pure magnesium rod with the required diameter of 10mm, stably fixing the pure magnesium rod obtained by extrusion on a numerical control machine tool, cutting, setting parameters of the numerical control machine tool, including rotating speed, feeding speed and cutting depth, compiling a machining program according to the size and geometric requirements of a screw, determining the relative positions of a cutting path, a cutter track and a workpiece, starting the numerical control machine tool, turning according to the compiled machining program, the method comprises the steps of precisely removing materials on the surface of a pure magnesium rod by controlling the movement and cutting parameters of a cutter, processing the pure magnesium rod into a pure magnesium screw meeting the requirements, performing surface treatment after turning, removing surface lubricants and oxides, performing proper cleaning and polishing to improve the surface quality and appearance of the pure magnesium screw, performing quality detection including roughness and tensile strength detection, measuring the surface roughness of the pure magnesium screw, performing tensile test to ensure that the surface roughness is within the range of Ra0.4-Ra0.8mm and the tensile strength is within the range of 190MPa-210MPa, and performing good surface treatment and quality detection by precisely controlling the technological parameters based on the extrusion technology and the cutting method in the whole working procedure to realize the processing and forming of the pure magnesium screw so as to obtain the pure magnesium screw meeting the requirements.
The present application is not limited to the above embodiments, and any equivalent embodiments which can be changed or modified by the technical disclosure described above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above embodiments according to the technical matter of the present application will still fall within the protection scope of the technical disclosure.
Claims (10)
1. The pure magnesium metal bone screw is characterized by comprising a nail head assembly (1), a first section of threaded shaft (2), a second section of threaded shaft (3), a third section of threaded shaft (4) and a nut assembly (5);
the nail head assembly (1) comprises a nail head main body (101), wherein a first thread (102) is arranged on the outer surface of the nail head main body (101), the nail head main body (101) is of a pointed structure, and the bottom diameter and the diameter are gradually increased;
the first-section threaded shaft (2) comprises a first threaded shaft main body (201), a second thread (202) is arranged on the outer surface of the first threaded shaft main body (201), the thread pitches of the second thread (202) are distributed gradually, the initial thread pitch of the second thread (202) is 0.5mm, and the final thread pitch of the second thread (202) is 1.5mm;
the two-section threaded shaft (3) comprises a second threaded shaft main body (301), wherein a third thread (302) is arranged on the outer surface of the second threaded shaft main body (301), the third thread (302) is arranged in a structure with the diameters of adjacent threads being spaced at intervals, and the pitch of the third thread (302) is 0.75mm;
the three-section threaded shaft (4) comprises a third threaded shaft (401), the outer surface of the third threaded shaft (401) is provided with fourth threads (402), the pitches of the fourth threads (402) are distributed in a gradually tightening mode, the initial pitch of the fourth threads (402) is 0.6mm, and the final pitch of the fourth threads (402) is 0.025mm;
the nut assembly (5) comprises a nut body (501), and a plum blossom groove (503) is formed in the rear end of the nut body (501).
2. The pure magnesium metal bone screw according to claim 1, wherein the rear end of the nail head main body (101) is provided with a first inner screw hole (103), the front end of the first threaded shaft main body (201) is provided with a first inner screw (203), the rear end of the first threaded shaft main body (201) is provided with a second inner screw (204), the front end of the second threaded shaft main body (301) is provided with a second inner screw (303), the rear end of the second threaded shaft main body (301) is provided with a third inner screw (304), the front end of the third threaded shaft (401) is provided with a third inner screw (403), the rear end of the third threaded shaft (401) is provided with a fourth inner screw (404), and the front end of the nut main body (501) is provided with a fourth inner screw (502).
3. The pure magnesium metal bone screw according to claim 2, wherein the first inner screw hole (103), the second inner screw hole (204), the third inner screw hole (304), the fourth inner screw hole (404) are meshed with the first inner screw (203), the second inner screw (303), the third inner screw (403), the fourth inner screw (502).
4. The pure magnesium metal bone screw according to claim 1, wherein the raw materials of the nail head assembly (1), the first-stage threaded shaft (2), the second-stage threaded shaft (3), the third-stage threaded shaft (4) and the nut assembly (5) are 99.99% pure magnesium metal bars, which are obtained by multi-pass extrusion of as-cast pure magnesium ingots.
5. The processing technology of the pure magnesium metal bone screw is characterized by comprising the following steps of:
s1: selecting 99.99% pure magnesium cast ingot as raw material;
s2: preparing a pure magnesium rod blank phi 100mm;
s3: the first extrusion to obtain a pure magnesium rod phi 35mm;
s4: preparing a pure magnesium rod blank phi 30mm;
s5: extruding for the second time to obtain a pure magnesium rod phi 10mm;
s6: and (5) processing the pure magnesium rod phi 10mm obtained in the step S5 into a pure magnesium screw by a numerical control processing method.
6. The process for manufacturing the pure magnesium metal bone screw according to claim 5, wherein in S2, the step of preparing the pure magnesium rod blank phi 100mm is specifically:
s201: processing the 99.99% pure magnesium cast ingot obtained in the step S1, heating the cast ingot to 350-450 ℃, and changing the shape of the cast ingot into a cylinder with the diameter of 100mm by forging or extrusion;
s202: grinding by sand paper to clean the magnesium cylindrical oxide layer or other impurities;
s203: checking and measuring the magnesium cylinder to ensure that the diameter of the magnesium cylinder is 100mm, and the surface of the magnesium cylinder is smooth and free of impurities;
s204: and cooling the processed magnesium cylinder, and then storing the magnesium cylinder to wait for the next extrusion treatment.
7. The process for manufacturing the pure magnesium metal bone screw according to claim 5, wherein in S3, the step of obtaining the pure magnesium rod phi 35mm by the first extrusion is specifically:
s301: preparing an extrusion cylinder with the diameter of 100mm, setting the diameter of a reducing area to be 35mm, and setting the extrusion ratio to be 8.16;
s302: preheating the extrusion cylinder to the temperature range of 250-300 ℃ for 2h, and synchronously preheating the pure magnesium rod blank to the temperature range of 250-300 ℃ for 2h;
s303: after preheating, uniformly coating graphite lubricant on the pure magnesium rod blank;
s304: placing the pure magnesium rod blank coated with the lubricant into a preheated extrusion barrel, and then starting extrusion, wherein the extrusion temperature is 350-400 ℃, the extrusion speed is 5-8 mm/s, and the extrusion force is 10-20 MPa;
s305: the extruded pure magnesium rod billet is taken out of the extrusion barrel and allowed to cool naturally.
8. The process for manufacturing the pure magnesium metal bone screw according to claim 5, wherein in S4, the step of preparing the pure magnesium rod blank phi 30mm is specifically:
s401: selecting a CNC lathe and a hard alloy cutter, setting the cutting speed to be 60-200m/min, the feedback depth to be 0.5-1.5mm, the feeding speed to be 0.1-0.4mm/rev and the rotating speed to be 200-2000rpm;
s402: in the turning process, stable movement of the sliding table is ensured, and each cutting route is accurately measured according to the shape and the size of the cutter;
s403: checking the diameter of the finished workpiece by adopting a digital display vernier caliper or a high-precision micrometer;
s404: selecting alcohol or ketone organic solvent, soaking at normal temperature of 30-35deg.C for 10-20min, and cleaning with force applied by brush during cleaning;
s405: washing the organic solvent, and rapidly drying the obtained pure magnesium rod blank phi 30mm by using a drying device, wherein the internal temperature of the drying device is set to 55-60 ℃.
9. The process for manufacturing the pure magnesium metal bone screw according to claim 5, wherein in S5, the step of obtaining the pure magnesium rod phi 10mm through the second extrusion is specifically:
s501: preparing an extrusion cylinder with the diameter of 30mm, and setting the diameter of a reducing area to be 10mm;
s502: preheating a pure magnesium rod blank phi 30mm and a die together, wherein the preheating temperature is 300-400 ℃ and the preheating time is 4 hours;
s503: setting the extrusion temperature in the range of 400-500 ℃, and applying extrusion force to push the pure magnesium rod to pass through the extrusion barrel and form a required shape, wherein the extrusion speed is 3-6 mm/s, and the extrusion force is 30-60 MPa;
s504: taking out the extruded pure magnesium rod from the extrusion barrel, naturally cooling, removing surface lubricant and oxide, and finishing the surface.
10. The process for manufacturing the pure magnesium metal bone screw according to claim 5, wherein in S6, the step of manufacturing the pure magnesium screw from the pure magnesium rod phi 10mm obtained in S5 by a numerical control method specifically comprises the following steps:
s601: setting parameters of a numerical control machine tool, wherein the rotating speed is 800-3000rpm, the feeding speed is 1-3 mm/s, and the cutting depth is 0.1-1mm;
s602: the method comprises the steps of stably fixing a pure magnesium rod phi 10mm in a clamp to avoid vibration and error, and writing a machining program of a numerical control machine tool according to the size and geometric characteristics of the pure magnesium metal bone screw, wherein the machining program comprises a cutting path, a movement track of a cutter, the relative position of the cutter track and a workpiece, cutting parameters and the like;
s603: starting a numerical control machine tool, and turning according to a written machining program;
s604: and removing the surface lubricant and oxide, and detecting roughness and tensile strength, so as to ensure that the surface roughness is between Ra0.4 and Ra0.8mm and the tensile strength is between 190MPa and 210 MPa.
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