CN109630862B - Method for manufacturing inner container of double-sealing-head high-pressure gas cylinder - Google Patents

Abstract

The invention provides a double-head high-pressure gas cylinder liner and a manufacturing method thereof. The double-head high-pressure gas cylinder liner is an aluminum alloy liner with a seamless structure in which both ends are closed to form a head and a bottle mouth, and includes a straight tube. Section, and the A head and B head respectively located at both ends of the straight section, the A bottle mouth and the B bottle mouth are located on the A head and the B head respectively; The nominal outer diameter is Φ406‑Φ850mm, and the rated pressure of the high-pressure gas cylinder is 20‑30Mpa. The invention generally adopts the spinning processing method, the whole product has no welding seam, the preparation process is simple, the operation is convenient, the energy consumption is low, the pollution is small, and the cost of raw materials is saved. The high-pressure gas cylinder liner processed by the manufacturing method of the present invention has the characteristics of high reliability, thin wall and light weight; the internal material structure is uniform and dense, the overall strength effect is excellent, and the high-pressure gas cylinder is resistant to high pressure, which is suitable for the manufacture of high-pressure gas cylinders. of great significance.

Description

Manufacturing method of double-head high-pressure gas cylinder liner

technical field

The invention belongs to the technical field of high-pressure containers, in particular to a double-head high-pressure gas cylinder liner and a manufacturing method thereof.

Background technique

High-pressure gas cylinders have been widely used in various industries of the national economy such as industrial and mining production, construction, transportation, marine, aviation, medical care, and military. The capacity of the high-pressure gas cylinder, the thickness of the bottle wall, and the manufacturing process and material will affect the performance of the high-pressure gas cylinder. Such as natural gas and hydrogen is a kind of clean energy that is developed and widely used in the world. At present, the use of 20-30MP high-pressure gas cylinders for storage, transportation and use of compressed natural gas (CNG), compressed hydrogen and other compressed industrial gases is the main way for these gases to be moved and used.

At present, the aluminum alloy liner carbon fiber full-wound high-pressure gas cylinder has many advantages, and has gradually replaced the traditional steel gas cylinder, becoming the mainstream product of the high-pressure gas cylinder in the world today. Its advantages are as follows:

(1) Significant weight reduction; gas cylinders using aluminum alloy liner composite winding, under the same performance, the material thickness is only 50%-70% of the steel cylinder, and the density is lower, so its weight is only 35%-40% of the traditional steel cylinder %.

(2) Good damage safety; the aluminum alloy liner carbon fiber full-wound gas cylinder is reinforced with aluminum alloy liner and carbon fiber composite material, and there are thousands of fibers per square centimeter. When the gas cylinder is overloaded and a small amount of fibers occurs When it breaks, its load will be quickly distributed on the unbroken fibers, which will prevent the cylinder from losing its carrying capacity in a short or even a long period of time, greatly improving safety.

(3) Good shock absorption; the interface between the fiber and the resin matrix in the composite material has shock absorption capacity, good vibration damping, and high anti-acoustic shock fatigue performance.

(4) Compared with the complex process required for seamless steel gas cylinders, the filament winding process is more flexible, easy to change, the process is more simplified, and it is easy to automate, and the energy consumption is far lower than the production process of steel gas cylinders .

For example, aluminum alloy liner carbon fiber fully wound gas cylinders with an outer diameter of Φ406-Φ850mm and a length of not more than 5m are mainly used as CNG fuel gas cylinders for large-scale natural gas vehicles, modular CNG gas cylinders, storage tanks, and other mobile use of large-volume high-pressure gas cylinder.

However, due to the limitation of material production and technical capabilities, my country has not yet been able to produce aluminum alloy liner carbon fiber fully wound gas cylinders with a diameter larger than Φ406mm. The core problem is that aluminum alloy liner cannot be manufactured, mainly relying on imports.

Under the above background, in order to further master the key technologies and products of large-scale compressed natural gas, hydrogen and mixed gas storage and transportation devices with independent property rights, it is urgent to develop dual Head pressure gas cylinder liner product.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a high-pressure gas cylinder aluminum alloy liner and a manufacturing method thereof. In order to at least solve the problems of small volume, excessive weight and poor reliability of the current high-pressure gas cylinder.

In order to achieve the above object, the present invention provides the following technical solutions:

A double-head high-pressure gas cylinder liner, the double-head high-pressure gas cylinder liner is used as an inner liner for wrapping the gas cylinder for storing compressed gas, and the double-head high-pressure gas cylinder liner is a closed-end forming head and The one-piece seamless structure aluminum alloy inner tank of the bottle mouth includes A bottle mouth, A head, straight cylinder section, B head and B bottle mouth, and the A head and B head are respectively located in the straight section. At both ends, the A bottle mouth and the B bottle mouth are respectively located on the A head and the B head; the length of the double head high-pressure gas cylinder is less than 5m, and the nominal outer diameter of the straight section is Ф406 -Ф850mm, the rated pressure of the high-pressure gas cylinder is 20-30Mpa.

In the double-head high-pressure gas cylinder liner as described above, preferably, the wall thickness of the straight section is 1-10 mm, and the overall straightness of the straight section is not greater than 0.5 mm/m;

Preferably, the tolerance of the wall thickness of the straight cylinder section is less than or equal to ±0.15mm;

Further preferably, the local straightness of the position of any straight section of the straight cylinder section is not greater than 0.5mm/300mm;

Further preferably, the roundness of any position of the straight cylinder section is not greater than 0.5mm;

Still preferably, the inner surface roughness of the straight cylinder section is less than Ra1.6 μm, and the outer surface roughness of the straight cylinder section is less than Ra3.2 μm.

In the double-head high-pressure gas cylinder liner described above, preferably, the structural type of the head is an ellipsoid head, a dish-shaped head or a hemispherical head, and the structural type of the A head is the same as that of the The structural type of the B head is the same, and the thickness of the head increases uniformly and gradually from the edge to the mouth of the bottle;

Preferably, the thickness of the sealing head increases uniformly and gradually from 5-8mm at the edge to 10-15mm at the mouth of the bottle;

Further preferably, the length of the bottle mouth is 40 mm, the outer diameter of the bottle mouth is 50 mm, and the inner diameter of the bottle mouth is 28 mm.

The manufacturing method of the double-head high-pressure gas cylinder liner described in any one of the above, preferably, the manufacturing method comprises the following steps:

S1, preparation of aluminum alloy inner tube spinning tube, using CNC powerful outer spinning machine to perform multi-pass powerful outer spinning forming treatment on the straight section of the seamless tube blank, to obtain the aluminum alloy inner tube spinning tube;

S2, the spinning forming of the head and the bottle mouth, using a heating and closing spinning machine to respectively carry out the spinning forming of the head and the bottle mouth at the openings of the two ends of the spinning tube of the aluminum alloy liner, to obtain a spinning forming part B ; Described spinning forming part B comprises straight cylinder section and the A head and B head at both ends of the straight cylinder section;

S3, the processing of the center hole of the bottle mouth, the machining of the center hole of the bottle mouth is performed on the A head and the B head at both ends of the spin-formed part B obtained in step S2, to obtain the spin-formed part C;

S4, curved surface flaw detection, the quality flaw detection of the closing of the spinning-formed part C obtained in step S3 is carried out, and it is checked whether the position of the sealing head has processing defects such as orange peel and folding;

S5, grinding the inner surface of the curved surface, according to the flaw detection results, using a head inner surface grinding machine to repair the inner surface defects of the head found in step S4, to obtain a spinning forming part C of qualified quality;

S6, heat treatment, carry out T6 process to the spin-formed part C obtained in step S5, obtain double-head high-pressure gas cylinder liner blank;

S7, bottle mouth processing, the bottle mouth machining center is used to machine the inner diameter and outer diameter of the bottle mouth A and bottle mouth B of the double-head high-pressure gas cylinder blank obtained in step S6, respectively, and process the inner thread of the bottle mouth , to obtain the inner liner of the double-head high-pressure gas cylinder;

S8, inner tank cleaning.

The above-mentioned manufacturing method of the double-head high-pressure gas cylinder liner, preferably, the step S1 specifically includes the following steps:

S11, the spinning forming of the straight section of the spinning tube of the aluminum alloy inner tube, the spinning process of the seamless tube blank is carried out 2-4 times by the spinning method of three rounds of staggered forward rotation or reverse rotation, and the spinning part A is obtained; When forward spinning, use a mandrel with a processing length equal to 1.2-1.4 times the set product length for spinning assistance; in reverse spinning, use a mandrel with a processing length equal to 0.6-0.8 times the set product length for spinning assistance processing;

S12, the fixed-length processing of the aluminum alloy liner spinning tube, the spinning part A obtained in step S11 is subjected to fixed-length processing to obtain the aluminum alloy liner spinning tube;

S13, cleaning of the spinning tube of the aluminum alloy inner bladder, using a cleaning machine to clean the spinning tube of the aluminum alloy inner bladder obtained in step S12;

S14, grinding the aluminum alloy inner tube spinning tube, and using a numerically controlled inner and outer cylindrical grinding machine to perform scratches and bruises on the inner and outer surfaces of the aluminum alloy inner tube spinning tube cleaned in step S13;

S15, using an ultrasonic automatic flaw detector to perform automatic flaw detection on the straight section of the aluminum alloy liner spinning tube obtained in step S14, to check whether there are processing defects such as peeling, wrinkles and cracks;

Preferably, in the three-wheel staggered forward spinning or reverse spinning method in the step S11, the staggered distance is set to 6-12 mm;

Preferably, the cleaning machine in the step S13 is a rotary spray cleaning machine or an ultrasonic cleaning machine;

Preferably, the cleaning of the aluminum alloy liner spinning tube is completed by heating a neutral cleaning agent at 30-45°C;

Still preferably, after cleaning the spinning tube of the aluminum alloy inner bladder, a drying appliance or a drying device is used to remove residual water stains on the surface.

The above-mentioned manufacturing method of the double-head high-pressure gas cylinder liner, preferably, the step S2 specifically includes the following steps:

S21, clamping, using split hollow spindle to clamp the aluminum alloy liner spinning tube;

S22, heating, heating to 180-390°C at the to-be-received spinning position of the aluminum alloy liner spinning tube;

S23, the forming and spinning of the head and the bottle mouth, the single-sided X-line, the Z-line and the rotary three-way interpolation closing spinning machine are used to perform multi-pass closing and spinning on the aluminum alloy liner spinning tube heated in step S22 pressure;

S24, repeating the operations of steps S21, S22, and S23 on the other end of the aluminum alloy liner spinning tube to obtain a spinning molded part B; head;

Preferably, the heating in the step S22 uses oxygen, propane/LNG for combustion and flame heating.

The above-mentioned method for manufacturing the inner liner of a double-head high-pressure gas cylinder, preferably, the step S5 specifically includes the following steps:

S51, using a clamping tool to clamp the spinning forming part C;

S52, the automatic endoscopic system that comes with the head inner surface grinding machine is used to automatically observe and judge the defects on the inner surface of the head, record the corresponding position, and combine with manual confirmation;

S53, using the head inner profile grinding mechanism of the head inner surface grinding machine to repair and grind the defects on the inner surface of the head found in step S4, to obtain a spinning forming part C of qualified quality;

Preferably, the clamping tool of the spinning forming part C is a split hollow clamping tool;

Preferably, the internal profile surface grinding of the head is a numerical control automatic grinding mechanism, which can be independently executed by programming.

The above-mentioned manufacturing method of the double-head high-pressure gas cylinder liner, preferably, the step S6 includes the following steps:

S61, quenching treatment, put the spin-formed part C obtained in step S5 into a quenching furnace for quenching treatment, heat the spin-formed part C to 525-531°C, and keep the temperature at 525-531°C for 2-4 hours, then the spin-formed part C is quenched;

S62, aging treatment, transferring the quenched spinning-formed part C to an aging furnace for aging treatment, and finally keeping the temperature at 160-200° C. for 6-10 hours to obtain a double-head high-pressure gas cylinder liner blank;

Preferably, the quenching furnace is a vertical aluminum alloy box-type quenching furnace; further preferably, the aging furnace is a trolley-type aluminum alloy aging furnace.

The above-mentioned method for manufacturing the inner liner of a double-head high-pressure gas cylinder, preferably, the step S7 specifically includes the following steps:

S71, using split-type hollow clamping tooling to clamp the liner blank of double-head high-pressure gas cylinder;

S72, bottle mouth processing, using a bottle mouth machining center to perform high-speed machining on the bottle mouth outer diameter, inner diameter and bottle mouth inner thread of the double-head high-pressure gas cylinder liner blank obtained in step S6, to obtain a double-head high-pressure gas cylinder liner, The length, outer diameter and inner diameter of A bottle mouth and B bottle mouth are 40mm, 50mm and 28mm respectively.

In the above-mentioned method for manufacturing the inner liner of a double-head high-pressure gas cylinder, preferably, the step S8 specifically includes the following steps:

S81, place the double-head high-pressure gas cylinder liner vertically on the vertical gas cylinder liner cleaning machine, so that the spray mechanism of the vertical gas cylinder liner cleaning machine enters the inner liner to fix the inner liner;

S82, use high-pressure water spray or ultrasonic cleaning to clean the inner cavity of the double-head high-pressure gas cylinder to remove processing pollutants.

Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

The manufacturing method of the double-head high-pressure gas cylinder liner provided by the present invention generally adopts the spinning processing method, the preparation process is simple, the operation is convenient, the energy consumption is low, the pollution is small, the loss of raw materials in the whole manufacturing process is relatively small, and the cost is saved. raw material cost. The inner liner of the double-head high-pressure gas cylinder processed by the manufacturing method of the present invention has uniform and dense material structure, excellent overall strength effect and high-pressure resistance.

In the prior art, it is difficult to produce an aluminum alloy liner for a high-pressure gas cylinder with a diameter larger than 406 mm. The invention creatively adopts the processing method of the tube blank through spinning, so that the diameter of the product reaches Φ406-Φ850 mm, and the overall diameter is large. The volume is much higher than that of the existing standard aluminum alloy liner; the wall thickness of the straight section is only 1-10mm, which has the characteristics of thin wall and light weight; it is of great significance to the manufacture of thin-walled high-pressure gas cylinders.

Description of drawings

Fig. 1 is the structural representation of the double-head high-pressure gas cylinder liner in the embodiment of the present invention;

FIG. 2 is a flow chart of a method for manufacturing a double-head high-pressure gas cylinder liner in an embodiment of the present invention.

In the picture: 1, A bottle mouth; 2, A head; 3, straight section; 4, B head; 5, B bottle mouth.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, the terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly through intermediate components. Connected, those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

The present invention provides a method for manufacturing a double-head high-pressure gas cylinder liner, wherein the double-head high-pressure gas cylinder liner is processed from a seamless tube blank by the manufacturing method; as shown in Figure 1, the double-head high-pressure gas cylinder The inner liner is an aluminum alloy inner liner with a one-piece seamless structure with both ends closed to form a head and a bottle mouth, including A bottle mouth 1, A head 2, straight section 3, B head 4 and B bottle mouth 5, A The sealing head 2 and the B sealing head 4 are respectively located at the two ends of the straight cylinder section 3, and the A bottle mouth 1 and the B bottle mouth 5 are respectively located on the A sealing head 2 and the B sealing head 4; the length of the double-head high-pressure gas cylinder is less than 5m, the nominal outer diameter of the straight section 3 is Φ406-Φ850mm (such as 450mm, 480mm, 500mm, 530mm, 560mm, 600mm, 630mm, 670mm, 700mm, 740mm, 770mm, 800mm, 830mm), and the rated pressure of the high-pressure gas cylinder is 20 -30Mpa (eg 21Mpa, 22Mpa, 23Mpa, 24Mpa, 25Mpa, 26Mpa, 27Mpa, 28Mpa, 29Mpa). The structure type of the head is ellipsoidal head, dish-shaped head or hemispherical head. The structure type of A head 2 is the same as that of B head 4, and the thickness of the head is uniform from the edge to the bottle mouth. Gradual thickening; in the embodiment of the present invention, the structure types of the A head 2 and the B head 4 are both disc-shaped; as shown in FIG. 2 , the manufacturing method of the double head high pressure gas cylinder liner of the present invention includes: Follow the steps below:

S1, the preparation of aluminum alloy inner tube spinning tube, using a numerical control strong outer spinning machine to carry out multi-pass strong outer spinning forming treatment on the straight section 3 of the seamless tube blank, to obtain an aluminum alloy inner tube spinning tube; this step is specific It includes the following steps:

S11, the spinning forming of the straight section 3 of the aluminum alloy inner tube spinning tube, using three rounds of staggered forward or reverse spinning methods to perform 2-4 times (for example, 2 times, 3 times, 4 times) on the seamless tube blank ) spinning process to obtain the spinning part A. In the embodiment of the present invention, the offset amount in the three-wheel offset forward or reverse spinning method is set to 6-12mm (for example, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm); during positive spinning, use a core with a processing length equal to 1.2-1.4 times the set product length (for example, 1.2 times, 1.25 times, 1.3 times, 1.35 times, 1.38 times, 1.4 times) Spinning auxiliary processing is performed on the mold; during reverse spinning, a core mold with a processing length equal to 0.6-0.8 times the set product length is used for spinning auxiliary processing; the total deformation of the seamless tube blank after spinning treatment is 55%- 70%; the length of the seamless tube blank is not more than 1.7m; the spinning part A is a straight cylinder of equal thickness or a straight cylinder section 3 with an outer ring end frame at both ends.

S12, the fixed-length processing of the aluminum alloy liner spinning tube, using a sawing machine to perform fixed-length processing on the spinning part A obtained in step S11, to obtain the aluminum alloy liner spinning tube; in the embodiment of the present invention, the sawing machine adopts Double-column automatic sawing machine, the saw blade adopts aluminum alloy special saw blade.

S13, for the cleaning of the spinning tube of the aluminum alloy liner, use a rotary spray cleaning machine or an ultrasonic Use a neutral cleaning agent at 38°C, 39°C, 40°C, 41°C, 42°C, 43°C, and 44°C) to clean the aluminum alloy liner spinning tube obtained in step S12; after cleaning, use special drying utensils Or use a drying device to remove residual water stains on the surface.

S14, repairing and grinding the spinning tube of the aluminum alloy inner tube, using a numerically controlled inner and outer cylindrical grinding machine to carry out scratches and bruises on the inner and outer surfaces of the spinning tube of the aluminum alloy inner tube after cleaning in step S13; this step specifically includes the following steps step:

S141, the outer surface of the aluminum alloy liner spinning tube is ground with a cloth abrasive belt;

S142, use the Chiba cloth grinding wheel to roughen the inner surface of the aluminum alloy liner spinning tube;

S143, using a scouring pad wheel to finish grinding the inner surface of the aluminum alloy liner spinning tube;

S15, using an ultrasonic automatic flaw detector to perform automatic flaw detection on the straight cylinder section 3 of the aluminum alloy liner spinning tube obtained in step S14 to check whether there are processing defects such as peeling, wrinkles, and cracks.

S2, the head and the bottle mouth are formed by spinning, and the head and bottle mouth are respectively formed by the heating and closing spinning machine on the openings of the two ends of the spinning tube of the aluminum alloy liner to obtain the spinning forming part B; The press-formed part B includes the straight cylinder section 3 and the A head 2 and the B head 4 at both ends of the straight cylinder section 3; this step specifically includes the following steps:

S21, clamping, using split hollow spindle to clamp the aluminum alloy liner spinning tube;

S22, heating, using oxygen, propane/LNG to perform flame heating to 180-390°C (for example, 200°C, 220°C, 240°C, 260°C, 280°C, 300℃, 320℃, 340℃, 360℃, 380℃);

S23, the forming and spinning of the head and the bottle mouth, the single-sided X-line, Z-line and rotary three-way interpolating closing spinning machine are used to perform 10-18 passes on the aluminum alloy inner tube spinning tube heated in step S22 During the spinning process, the 1st to 8th passes (for example, 1 pass, 2 times, 3 times, 4 times, 5 times, 6 times, 7 times, 8 times) of the close end spinning with reverse rotation , used for the thickening of the mouth of the bottle; the thickness of the prepared head is 5-8mm from the edge (for example, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm , 7mm, 7.3mm, 7.6mm, 7.8mm) to the 10-15mm (such as 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm) of the bottle mouth area.

S24, repeating the operations of steps S21, S22, S23 to the other end of the aluminum alloy liner spinning tube, to obtain a spinning molded part B; the spinning molded part B includes the straight cylinder section 3 and the A head 2 and B head 4.

S3, the processing of the center hole of the bottle mouth, the split hollow clamping tool is used to clamp the spin-formed part B, and the special bottle-mouth machining center is used to process the A head 2 at both ends of the spin-formed part B obtained in step S2. Machining the center hole of the bottle mouth with the B head 4 respectively to obtain the spinning molded part C; make preparations for the subsequent heat treatment;

S4, curved surface flaw detection, performing flaw detection on the closing quality of the spin-formed part C obtained in step S3, and checking whether the position of the sealing head has processing defects such as orange peel and folding;

S5, grinding the inner surface of the curved surface, according to the flaw detection results, use a special head inner surface grinding machine to repair the inner surface defects of the head found in step S4, and obtain a spinning forming part C of qualified quality; this step specifically includes Follow the steps below:

S51, using a split hollow clamping tool to clamp the spin-formed part C;

S52, the automatic endoscopic system that comes with the special head inner surface grinding machine is used to automatically observe and judge the defects on the inner surface of the head, record the corresponding position, and combine with manual confirmation;

S53, use the CNC automatic grinding mechanism of the special head inner surface grinding machine to repair the inner surface defects of the head found in step S5, and obtain a spinning forming part C of qualified quality. During the grinding process, the CNC automatic The grinding mechanism can be programmed and executed independently.

S6, heat treatment, performing T6 process treatment on the spinning molded part C obtained in step S5 to obtain a double-head high-pressure gas cylinder liner blank; this step specifically includes the following steps:

S61, quenching treatment, put the spin-formed part C obtained in step S5 into a vertical aluminum alloy box-type quenching furnace for quenching treatment, and heat the spin-formed part C to 525-531° C. (for example, 525.5° C., 526° C. , 526.5°C, 527°C, 527.5°C, 528°C, 528.5°C, 529°C, 529.5°C, 530°C, 530.5°C), and at 525-531°C (eg 525.5°C, 526°C, 526.5°C, 527°C, 527.5°C) ℃, 528℃, 528.5℃, 529℃, 529.5℃, 530℃, 530.5℃) for 2-4 hours (for example, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours, 3 hours, 3.2 hours, 3.4 hours, 3.6 hours, 3.8 hours), and then quench the spin-formed part C with water medium; during quenching, it should be ensured that the time from the opening of the furnace door of the quenching furnace to the liner of the double-head high-pressure gas cylinder should not exceed 8s.

S62, aging treatment, transfer the quenched spin-formed part C to a trolley-type aluminum alloy aging furnace for aging treatment, and finally at 160-200 °C (such as 165 °C, 170 °C, 175 °C, 180 °C, 185 °C, 190°C, 195°C, 198°C) for 6-10 hours (for example, 6.3 hours, 6.6 hours, 7 hours, 7.3 hours, 7.7 hours, 8 hours, 8.4 hours, 8.7 hours, 9 hours, 9.3 hours, 9.7 hours ) to prepare a double-head high-pressure gas cylinder liner blank. In the whole process of quenching treatment and aging treatment, the inner blank of the double-head high-pressure gas cylinder is vertically fixed in the special heat treatment material frame by a special heat treatment tool.

S7, bottle mouth processing, using a special bottle mouth machining center to machine the inner and outer diameters of the A bottle mouth 1 and the B bottle mouth 5 of the double-head high-pressure gas cylinder blank obtained in step S6, respectively, and process the The inner thread of the bottle mouth is obtained to obtain the inner liner of the double-head high-pressure gas cylinder; this step specifically includes the following steps:

S71, using split-type hollow clamping tooling to clamp the liner blank of double-head high-pressure gas cylinder;

S72, bottle mouth processing, using a special bottle mouth machining center to perform high-speed processing on the bottle mouth outer diameter, inner diameter and bottle mouth inner thread of the double-head high-pressure gas cylinder liner blank obtained in step S6, to obtain the double-head high-pressure gas cylinder liner , the length, outer diameter and inner diameter of A bottle mouth 1 and B bottle mouth 5 are 40mm, 50mm, and 28mm, respectively.

S8, liner cleaning, using a special vertical gas cylinder liner cleaning machine to perform high-pressure water spray cleaning on the inner cavity of the double-head high-pressure gas cylinder obtained in step S7 to remove aluminum scraps and other processing pollutants; the The steps specifically include the following steps:

S81, place the inner liner of the double-head high-pressure gas cylinder vertically on the special vertical gas cylinder liner cleaning machine, so that the spray mechanism of the special vertical gas cylinder liner cleaning machine enters the inner liner to fix the inner liner;

S82, use high-pressure water spray or ultrasonic cleaning to clean the inner cavity of the double-head high-pressure gas cylinder to remove aluminum chips and other processing pollutants.

S9, inspection of the finished product, inspecting the inner liner of the double-head high-pressure gas cylinder obtained in step S8 to obtain the finished product of the inner liner of the double-head high-pressure gas cylinder.

S10, carbon fiber winding is performed on the finished product of the double-head high-pressure gas cylinder obtained in step S9 to obtain a high-pressure gas cylinder, and the ultimate pressure bearing condition of the high-pressure gas cylinder is detected.

The double-head high-pressure gas cylinder liner prepared by the manufacturing method of the present invention has a length of less than 5m, the nominal outer diameter of the straight cylinder section 3 is Φ406-Φ850mm, and the wall thickness of the straight cylinder section 3 is 1-10mm (such as 1mm, 2mm, 3mm, mm, 5mm, 6mm, 7mm, 8mm, 9mm), the overall straightness of the straight section 3 is not greater than 0.5mm/m; the tolerance of the wall thickness of the straight section 3 is less than or equal to ±0.15mm; the position of any straight section of the straight section 3 The local straightness is not more than 0.5mm/300mm; the roundness at any position of the straight tube section 3 is no more than 0.5mm; the inner surface roughness of the straight tube section 3 is less than Ra1.6μm, and the outer surface roughness of the straight tube section 3 is less than Ra3.2μm. The volume of the inner liner of the double-head high-pressure gas cylinder prepared by the manufacturing method of the invention is much higher than that of the existing standard aluminum alloy inner liner, and also has the characteristics of thin wall thickness, high pressure resistance and light weight.

Example 1

To prepare a double-head high-pressure gas cylinder liner with a diameter of Φ420mm, a length of 2.5m and a wall thickness of 4mm, the rated pressure of the high-pressure gas cylinder is required to be 25Mpa, which specifically includes the following steps:

S1, preparation of aluminum alloy liner spinning tube, this step specifically includes the following steps:

S11, Spinning forming of the straight section 3 of the aluminum alloy liner spinning tube, using the three-wheel staggered distance positive spinning method to perform 2 passes of spinning on the seamless tube blank with a length of 1m, and the three-wheel staggered distance positive spinning method. The offset amount in the pressing method is set to 6mm;

The spinning part A is obtained, and the spinning part A is a straight cylinder of equal thickness or a straight cylinder section 3 with an outer ring end frame at both ends; the size of the spinning part A is: the total length is 3000mm, the thickness of the straight cylinder section 3 is 4mm, The thickness of the stage at both ends is 10mm.

S12, the fixed-length processing of the aluminum alloy liner spinning tube, using a double-column automatic sawing machine to perform fixed-length processing on the spinning part A obtained in step S11, to obtain the aluminum alloy liner spinning tube, and the aluminum alloy liner spinning The length of the straight tube section 3 is 2600mm;

S13, for cleaning the spinning tube of the aluminum alloy inner tube, use a rotary spray cleaning machine or an ultrasonic cleaning machine to add a neutral cleaning agent at 40°C to clean the spinning tube of the aluminum alloy inner tube obtained in step S12; Use a special drying tool or drying device to remove residual water stains on the surface.

S14, repairing and grinding the spinning tube of the aluminum alloy inner tube, using a numerically controlled inner and outer cylindrical grinding machine to carry out scratches and bruises on the inner and outer surfaces of the spinning tube of the aluminum alloy inner tube after cleaning in step S13; this step specifically includes the following steps step:

S141, the outer surface of the aluminum alloy liner spinning tube is ground with a cloth abrasive belt;

S142, use the Chiba cloth grinding wheel to roughen the inner surface of the aluminum alloy liner spinning tube;

S143, using a scouring pad wheel to finish grinding the inner surface of the aluminum alloy liner spinning tube;

S15, using an ultrasonic automatic flaw detector to perform automatic flaw detection on the aluminum alloy inner tube spinning tube obtained in step S14, to check whether the cylinder body has processing defects such as orange peel and folding.

S2, the head and the bottle mouth are formed by spinning, and the head and bottle mouth are respectively formed by the heating and closing spinning machine on the openings of the two ends of the spinning tube of the aluminum alloy liner to obtain the spinning forming part B; The press-formed part B includes the straight cylinder section 3 and the A head 2 and the B head 4 at both ends of the straight cylinder section 3; this step specifically includes the following steps:

S21, clamping, using split hollow spindle to clamp the aluminum alloy liner spinning tube;

S22, heating, using oxygen, propane/LNG combustion to carry out flame heating to 310°C at the to-be-received spinning position of the aluminum alloy liner spinning tube;

S23, the forming and spinning of the head and the bottle mouth, the single-sided X-line, the Z-line and the rotary three-way interpolation type closing and spinning machine are used to close and spin the aluminum alloy liner spinning tube heated in step S22;

During the spinning process, the closing spinning has 4 reverse spins for thickening the bottle mouth; the thickness of the head of the prepared spinning molded part B is uniformly graded from 8 mm at the edge to 12 mm at the bottle mouth. thickened.

S24, repeating the operations of steps S21, S22, S23 to the other end of the aluminum alloy liner spinning tube, to obtain a spinning molded part B; the spinning molded part B includes the straight cylinder section 3 and the A head 2 and B head 4.

S3, the processing of the center hole of the bottle mouth, the split hollow clamping tool is used to clamp the spin-formed part B, and the special bottle-mouth machining center is used to process the A head 2 at both ends of the spin-formed part B obtained in step S2. Machining the center hole of the bottle mouth with the B head 4 respectively to obtain the spinning molded part C; make preparations for the subsequent heat treatment;

S4, curved surface flaw detection, performing flaw detection on the closing quality of the spin-formed part C obtained in step S3, and checking whether the position of the sealing head has processing defects such as orange peel and folding;

S5, grinding the inner surface of the curved surface, according to the flaw detection results, use a special head inner surface grinding machine to repair the inner surface defects of the head found in step S4, and obtain a spinning forming part C of qualified quality; this step specifically includes Follow the steps below:

S51, using a split hollow clamping tool to clamp the spin-formed part C;

S52, the automatic endoscopic system that comes with the special head inner surface grinding machine is used to automatically observe and judge the defects on the inner surface of the head, record the corresponding position, and combine with manual confirmation;

S53, use the CNC automatic grinding mechanism of the special head inner surface grinding machine to repair the inner surface defects of the head found in step S5, and obtain a spinning forming part C of qualified quality. During the grinding process, the CNC automatic The grinding mechanism can be programmed and executed independently.

S6, heat treatment, performing T6 process treatment on the spinning molded part C obtained in step S5 to obtain a double-head high-pressure gas cylinder liner blank; this step specifically includes the following steps:

S61, quenching treatment, put the spin-formed part C obtained in step S5 into a vertical aluminum alloy box-type quenching furnace for quenching treatment, heat the spin-formed part C to 525-531° C., and heat it at 525-531° C. Heat preservation in the environment for 3.5 hours, and then the spin-formed part C is quenched in water medium;

S62, aging treatment, transfer the quenched spinning-formed part C to a trolley-type aluminum alloy aging furnace for aging treatment, and finally keep the temperature at 160°C for 9 hours to obtain a double-head high-pressure gas cylinder liner blank. In the whole process of quenching treatment and aging treatment, the inner blank of the double-head high-pressure gas cylinder is vertically fixed in the special heat treatment material frame by a special heat treatment tool.

S7, bottle mouth processing, using a special bottle mouth machining center to machine the inner and outer diameters of the A bottle mouth 1 and the B bottle mouth 5 of the double-head high-pressure gas cylinder blank obtained in step S6, respectively, and process the The inner thread of the bottle mouth is obtained to obtain the inner liner of the double-head high-pressure gas cylinder; this step specifically includes the following steps:

S71, using split-type hollow clamping tooling to clamp the liner blank of double-head high-pressure gas cylinder;

S72, bottle mouth processing, using a special bottle mouth machining center to perform high-speed processing on the bottle mouth outer diameter, inner diameter and bottle mouth inner thread of the double-head high-pressure gas cylinder liner blank obtained in step S6, to obtain the double-head high-pressure gas cylinder liner , the length, outer diameter and inner diameter of A bottle mouth 1 and B bottle mouth 5 are 40mm, 50mm, and 28mm, respectively.

S8, liner cleaning, using a special vertical gas cylinder liner cleaning machine to perform high-pressure water spray cleaning on the inner cavity of the double-head high-pressure gas cylinder obtained in step S7 to remove aluminum scraps and other processing pollutants; the The steps specifically include the following steps:

S81, place the inner liner of the double-head high-pressure gas cylinder vertically on the special vertical gas cylinder liner cleaning machine, so that the spray mechanism of the special vertical gas cylinder liner cleaning machine enters the inner liner to fix the inner liner;

S82, use high-pressure water spray or ultrasonic cleaning to clean the inner cavity of the double-head high-pressure gas cylinder to remove aluminum chips and other processing pollutants.

S9, finished product inspection, inspect the inner liner of the double-head high-pressure gas cylinder obtained in step S8, conduct random inspection on some items, and measure the microstructure and grain size of any six positions of the double-head high-pressure gas cylinder liner of the sampling inspection. , according to the ASTME112 standard, the microstructure and grain size of the six positions are respectively grade 6, grade 6, grade 7, grade 7, grade 6, grade 5. For the straight section 3 of the double-head high-pressure gas cylinder liner sampled for sampling tensile strength. Yield strength and elongation were measured separately. After measurement, the tensile strength of straight section 3 was 345MPa, the yield strength was 310MPa, and the elongation was 16%. The products produced in this batch were qualified, and the liner of the double-head high-pressure gas cylinder was obtained. finished product.

S10, carbon fiber winding is performed on the finished product of the double-head high-pressure gas cylinder obtained in step S9 to obtain a high-pressure gas cylinder, and the ultimate pressure bearing condition of the high-pressure gas cylinder is detected.

After inspection, the grain size of the structure at any position of the double-head high-pressure gas cylinder obtained in this example is greater than or equal to 5 according to the ASTME112 standard grade, the tensile strength of the straight cylinder section 3 is 345MPa, the yield strength is 310MPa, The elongation rate is 16%; the test ultimate pressure of the high-pressure gas cylinder obtained after the inner liner is wound is 75Mpa, which meets the requirement of the rated pressure of 25Mpa.

Example 2

To prepare a double-head high-pressure gas cylinder liner with a diameter of 618mm, a length of 4.5m and a wall thickness of 6mm, the rated pressure of the high-pressure gas cylinder is required to be 25Mpa, and the specific operation steps are as follows:

S1, preparation of aluminum alloy liner spinning tube, this step specifically includes the following steps:

S11, Spinning forming of the straight section 3 of the aluminum alloy liner spinning tube, using the three-round staggered back-spinning method to perform 3 passes of spinning on the seamless tube blank with a length of 1.5m, and the three-round staggered back-spinning method The offset amount in the spinning method is set to 6mm;

The spinning part A is obtained, and the spinning part A is a straight cylinder of equal thickness or a straight cylinder section 3 with an outer ring end frame at both ends; the size of the spinning part A is: the total length is 4700mm, the thickness of the straight cylinder section 3 is 6mm, The thickness of the end frame sections at both ends is 11mm.

S12, the fixed-length processing of the aluminum alloy liner spinning tube, using a double-column automatic sawing machine to perform fixed-length processing on the spinning part A obtained in step S11, to obtain the aluminum alloy liner spinning tube, and the aluminum alloy liner spinning The length of the straight tube section 3 is 4600mm;

S13, for the cleaning of the spinning tube of the aluminum alloy inner bladder, a rotary spray cleaning machine or an ultrasonic cleaning machine is used to add a neutral cleaning agent at 35°C to clean the spinning tube of the aluminum alloy inner bladder obtained in step S12; Use a special drying tool or drying device to remove residual water stains on the surface.

S14, repairing and grinding the spinning tube of the aluminum alloy inner tube, using a numerically controlled inner and outer cylindrical grinding machine to carry out scratches and bruises on the inner and outer surfaces of the spinning tube of the aluminum alloy inner tube after cleaning in step S13; this step specifically includes the following steps step:

S141, the outer surface of the aluminum alloy liner spinning tube is ground with a cloth abrasive belt;

S142, use the Chiba cloth grinding wheel to roughen the inner surface of the aluminum alloy liner spinning tube;

S143, using a scouring pad wheel to finish grinding the inner surface of the aluminum alloy liner spinning tube.

S15, using an ultrasonic automatic flaw detector to perform automatic flaw detection on the aluminum alloy inner tube spinning tube obtained in step S14, to check whether the cylinder body has processing defects such as orange peel and folding.

S2, the head and the bottle mouth are formed by spinning, and the head and bottle mouth are respectively formed by the heating and closing spinning machine on the openings of the two ends of the spinning tube of the aluminum alloy liner to obtain the spinning forming part B; The press-formed part B includes the straight cylinder section 3 and the A head 2 and the B head 4 at both ends of the straight cylinder section 3; this step specifically includes the following steps:

S21, clamping, using split hollow spindle to clamp the aluminum alloy liner spinning tube;

S22, heating, using oxygen, propane/LNG combustion to carry out flame heating to 250 ° C at the to-be-received spinning position of the aluminum alloy liner spinning tube;

S23, the forming and spinning of the head and the bottle mouth, the single-sided X-line, the Z-line and the rotary three-way interpolation type closing and spinning machine are used to close and spin the aluminum alloy liner spinning tube heated in step S22;

In the process of spinning, the closing spinning has 4 reverse spins, which are used to thicken the bottle mouth; the thickness of the head of the prepared spinning molded part B is uniform from 9 mm at the edge to 12.5 mm at the bottle mouth. Gradient thickening.

S24, repeating the operations of steps S21, S22, S23 to the other end of the aluminum alloy liner spinning tube, to obtain a spinning molded part B; the spinning molded part B includes the straight cylinder section 3 and the A head 2 and B head 4.

S3, the processing of the center hole of the bottle mouth, the split hollow clamping tool is used to clamp the spin-formed part B, and the special bottle-mouth machining center is used to process the A head 2 at both ends of the spin-formed part B obtained in step S2. Machining the center hole of the bottle mouth with the B head 4 respectively to obtain the spinning molded part C; make preparations for the subsequent heat treatment;

S4, curved surface flaw detection, performing flaw detection on the closing quality of the spin-formed part C obtained in step S3, and checking whether the position of the sealing head has processing defects such as orange peel and folding;

S5, grinding the inner surface of the curved surface, according to the flaw detection results, use a special head inner surface grinding machine to repair the inner surface defects of the head found in step S4, and obtain a spinning forming part C of qualified quality; this step specifically includes Follow the steps below:

S51, using a split hollow clamping tool to clamp the spin-formed part C;

S52, the automatic endoscopic system that comes with the special head inner surface grinding machine is used to automatically observe and judge the defects on the inner surface of the head, record the corresponding position, and combine with manual confirmation;

S53, use the CNC automatic grinding mechanism of the special head inner surface grinding machine to repair the inner surface defects of the head found in step S5, and obtain a spinning forming part C of qualified quality. During the grinding process, the CNC automatic The grinding mechanism can be programmed and executed independently.

S6, heat treatment, performing T6 process treatment on the spinning molded part C obtained in step S5 to obtain a double-head high-pressure gas cylinder liner blank; this step specifically includes the following steps:

S61, quenching treatment, put the spin-formed part C obtained in step S5 into a vertical aluminum alloy box-type quenching furnace for quenching treatment, heat the spin-formed part C to 525-531° C., and heat it at 525-531° C. Heat preservation in the environment for 3 hours, and then carry out aqueous medium quenching for the spin-formed part C;

S62, aging treatment, transfer the quenched spin-formed part C to a trolley-type aluminum alloy aging furnace for aging treatment, and finally keep the temperature at 170 °C for 8 hours to obtain a double-head high-pressure gas cylinder liner blank. In the whole process of quenching treatment and aging treatment, the inner blank of the double-head high-pressure gas cylinder is vertically fixed in the special heat treatment material frame by a special heat treatment tool.

S7, bottle mouth processing, using a special bottle mouth machining center to machine the inner and outer diameters of the A bottle mouth 1 and the B bottle mouth 5 of the double-head high-pressure gas cylinder blank obtained in step S6, respectively, and process the The inner thread of the bottle mouth is obtained to obtain the inner liner of the double-head high-pressure gas cylinder; this step specifically includes the following steps:

S71, using split-type hollow clamping tooling to clamp the liner blank of double-head high-pressure gas cylinder;

S72, bottle mouth processing, using a special bottle mouth machining center to perform high-speed processing on the bottle mouth outer diameter, inner diameter and bottle mouth inner thread of the double-head high-pressure gas cylinder liner blank obtained in step S6, to obtain the double-head high-pressure gas cylinder liner , the length, outer diameter and inner diameter of A bottle mouth 1 and B bottle mouth 5 are 40mm, 50mm, and 28mm, respectively.

S8, liner cleaning, using a special vertical gas cylinder liner cleaning machine to perform high-pressure water spray cleaning on the inner cavity of the double-head high-pressure gas cylinder obtained in step S7 to remove aluminum scraps and other processing pollutants; the The steps specifically include the following steps:

S81, place the inner liner of the double-head high-pressure gas cylinder vertically on the special vertical gas cylinder liner cleaning machine, so that the spray mechanism of the special vertical gas cylinder liner cleaning machine enters the inner liner to fix the inner liner;

S82, use high-pressure water spray or ultrasonic cleaning to clean the inner cavity of the double-head high-pressure gas cylinder to remove aluminum chips and other processing pollutants.

S9, finished product inspection, inspect the inner liner of the double-head high-pressure gas cylinder obtained in step S8, conduct random inspection on some items, and measure the microstructure and grain size of any six positions of the double-head high-pressure gas cylinder liner of the sampling inspection. , the measurement results of the six positions of the organization and grain size are 6, 6, 7, 6, 6, 6 according to the ASTME112 standard. tensile strength. Yield strength and elongation were measured respectively. After measurement, the tensile strength of the straight section 3 was 353MPa, the yield strength was 323MPa, and the elongation was 15%. finished product.

S10, carbon fiber winding is performed on the finished product of the double-head high-pressure gas cylinder obtained in step S9 to obtain a high-pressure gas cylinder, and the ultimate pressure bearing condition of the high-pressure gas cylinder is detected.

After inspection, the grain size of the structure at any position of the double-head high-pressure gas cylinder obtained in this example is greater than or equal to 5 according to the ASTME112 standard grade, the tensile strength of the straight cylinder section 3 is 353MPa, the yield strength is 323MPa, The elongation rate is 15%; the test ultimate pressure of the high-pressure gas cylinder obtained after the inner liner is wound is 76Mpa, which meets the requirement of the rated pressure of 25Mpa.

To sum up, the manufacturing method of the double-head high-pressure gas cylinder liner provided by the present invention generally adopts the spinning processing method, which has low energy consumption, low pollution, less loss of raw materials in the entire manufacturing process, and saves the cost of raw materials. . The double-head high-pressure gas cylinder liner processed by the manufacturing method of the present invention has a nominal outer diameter of Φ406-Φ850mm, and the volume is much higher than that of the existing standard aluminum alloy liner; the wall thickness of the straight cylinder section is 1-10mm, It has the characteristics of thin wall thickness and light weight; the tensile strength of the straight section is greater than or equal to 345MPa, the yield strength is greater than or equal to 310MPa, and the elongation is greater than or equal to 15%; the grain size of the straight section at any position meets the requirements of grade 5 or greater according to the ASTME112 standard , the material structure is uniform and dense, the overall strength effect is excellent, and it has the characteristics of high pressure resistance, which is of great significance to the manufacture of high pressure gas cylinders.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the rights to be approved in the present invention. within the scope of protection.

Claims (12)

1. a manufacture method of double-head high-pressure gas cylinder liner, is characterized in that, described double-head high-pressure gas cylinder liner is used for storing compressed gas as the inner liner of winding gas cylinder, and described double-head high-pressure gas cylinder is used for storing compressed gas. The inner liner of the bottle is an aluminum alloy inner liner with a one-piece seamless structure with both ends closed to form a head and a bottle mouth, including A bottle mouth, A head, straight cylinder section, B head and B bottle mouth. The A head and B heads are respectively located at both ends of the straight cylinder section, and the A bottle mouth and the B bottle mouth are respectively located on the A and B heads; the length of the double-head high-pressure gas cylinder liner is 4.5 m, the nominal outer diameter of the straight cylinder section is Ф618mm, and the rated pressure of the high-pressure gas cylinder is 25Mpa; The wall thickness of the straight section is 6mm, and the overall straightness of the straight section is not more than 0.5mm/m; the tolerance of the wall thickness of the straight section is less than or equal to ±0.15mm; the position of any straight section of the straight section is a local straight line The degree of roundness is not more than 0.5mm/300mm; the roundness of any position of the straight cylinder section is not more than 0.5mm; the inner surface roughness of the straight cylinder section is less than Ra1.6μm, and the outer surface roughness of the straight cylinder section is less than Ra3.2μm; The manufacturing method includes the following steps: S1, preparation of aluminum alloy inner tube spinning tube, using CNC powerful outer spinning machine to perform multi-pass powerful outer spinning forming treatment on the straight section of the seamless tube blank, to obtain the aluminum alloy inner tube spinning tube; The step S1 specifically includes the following steps: S11, the spinning forming of the straight section of the aluminum alloy liner spinning tube, using the three-wheel staggered forward or reverse spinning method to perform 2-4 spinning processes on the seamless tube blank to obtain the spinning part A, The amount of offset in the three-wheel staggered forward or reverse spinning method is set to 6-12mm; during forward spinning, a core mold with a processing length equal to 1.2-1.4 times the set product length is used for spinning auxiliary processing ;When reverse spinning, use a core mold with a processing length equal to 0.6-0.8 times the set product length to perform spinning auxiliary processing; S12, the fixed-length processing of the aluminum alloy liner spinning tube, the spinning part A obtained in step S11 is subjected to fixed-length processing to obtain the aluminum alloy liner spinning tube; S13, cleaning of the spinning tube of the aluminum alloy inner bladder, using a cleaning machine to clean the spinning tube of the aluminum alloy inner bladder obtained in step S12; S14, grinding the aluminum alloy inner tube spinning tube, and using a numerically controlled inner and outer cylindrical grinding machine to perform scratches and bruises on the inner and outer surfaces of the aluminum alloy inner tube spinning tube cleaned in step S13; S15, using an ultrasonic automatic flaw detector to perform automatic flaw detection on the straight section of the aluminum alloy liner spinning tube obtained in step S14, to check whether there are processing defects such as peeling, wrinkles and cracks; S2, the spinning forming of the head and the bottle mouth, using a heating and closing spinning machine to respectively carry out the spinning forming of the head and the bottle mouth at the openings of the two ends of the spinning tube of the aluminum alloy liner, to obtain a spinning forming part B ; Described spinning forming part B includes A head and B head at both ends of straight cylinder section and straight cylinder section; Described step S2 specifically includes the following steps: S21, clamping, using split hollow spindle to clamp the aluminum alloy liner spinning tube; S22, heating, heating to 180-380°C at the to-be-received spinning position of the aluminum alloy liner spinning tube; the heating in the step S22 uses oxygen, propane/LNG for combustion and flame heating; S23, the forming and spinning of the head and the bottle mouth, the single-sided X-line, the Z-line and the rotary three-way interpolation closing spinning machine are used to perform multi-pass closing and spinning on the aluminum alloy liner spinning tube heated in step S22 Pressing, closing the first-8 passes of spinning with anti-spinning; S24, repeating the operations of steps S21, S22, and S23 on the other end of the aluminum alloy liner spinning tube to obtain a spinning molded part B; head; S3, the processing of the center hole of the bottle mouth, the machining of the center hole of the bottle mouth is performed on the A head and the B head at both ends of the spin-formed part B obtained in step S2, to obtain the spin-formed part C; S4, curved surface flaw detection, the quality flaw detection of the closing of the spinning-formed part C obtained in step S3 is carried out, and it is checked whether the position of the sealing head has processing defects such as orange peel and folding; S5, grinding the inner surface of the curved surface, according to the flaw detection result, using a head inner surface grinding machine to repair the inner surface defects of the head found in step S4, to obtain a spinning forming part C of qualified quality; S6, heat treatment, perform T6 process on the spin-formed part C obtained in step S5 to obtain a double-head high-pressure gas cylinder liner blank; the step S6 specifically includes the following steps: S61, quenching treatment, put the spin-formed part C obtained in step S5 into a quenching furnace for quenching treatment, heat the spin-formed part C to 525-531°C, and keep the temperature at 525-531°C for 2.2-4 hours, then quench the spin-formed part C. During quenching, it should be ensured that the time from the opening of the furnace door of the quenching furnace to the liner of the double-head high-pressure gas cylinder should not exceed 8s; S62, aging treatment, transferring the quenched spinning-formed part C to an aging furnace for aging treatment, and finally keeping the temperature at 160-200° C. for 6-10 hours to obtain a double-head high-pressure gas cylinder liner blank; S7, bottle mouth processing, the bottle mouth machining center is used to machine the inner diameter and outer diameter of the bottle mouth A and bottle mouth B of the double-head high-pressure gas cylinder blank obtained in step S6, respectively, and process the inner thread of the bottle mouth , to obtain the inner liner of the double-head high-pressure gas cylinder; S8, inner tank cleaning. 2. The manufacturing method of the double-head high-pressure gas cylinder liner as claimed in claim 1, wherein the structural type of the head is an ellipsoidal head, a dish-shaped head or a hemispherical head, so the The structure type of the A head is the same as that of the B head, and the thickness of the head increases uniformly and gradually from the edge to the mouth of the bottle. 3. the manufacture method of double-head high-pressure gas cylinder liner as claimed in claim 2, is characterized in that, the thickness of described head is uniformly gradually thickened by 5-8mm of edge to 10-15mm of bottle mouth position; The length of the bottle mouth is 40 mm, the outer diameter of the bottle mouth is 50 mm, and the inner diameter of the bottle mouth is 28 mm. 4. the manufacture method of double-head high-pressure gas cylinder liner as claimed in claim 1, is characterized in that, described step S5 specifically comprises the following steps: S51, using a clamping tool to clamp the spinning forming part C; S52, the automatic endoscopic system that comes with the head inner surface grinding machine is used to automatically observe and judge the defects on the inner surface of the head, record the corresponding position, and combine with manual confirmation; S53, using the head inner profile grinding mechanism of the head inner surface grinding machine to repair and grind the defects on the inner surface of the head found in step S4, to obtain a spinning forming part C of qualified quality. 5. The manufacturing method of the double-head high-pressure gas cylinder liner as claimed in claim 1, wherein the step S7 specifically comprises the following steps: S71, using split-type hollow clamping tooling to clamp the liner blank of double-head high-pressure gas cylinder; S72, bottle mouth processing, using a bottle mouth machining center to perform high-speed machining on the bottle mouth outer diameter, inner diameter and bottle mouth inner thread of the double-head high-pressure gas cylinder liner blank obtained in step S6, to obtain a double-head high-pressure gas cylinder liner, The length, outer diameter and inner diameter of A bottle mouth and B bottle mouth are 40mm, 50mm and 28mm respectively. 6. The manufacturing method of the double-head high-pressure gas cylinder liner as claimed in claim 1, wherein the step S8 specifically comprises the following steps: S81, place the double-head high-pressure gas cylinder liner vertically on the vertical gas cylinder liner cleaning machine, so that the spray mechanism of the vertical gas cylinder liner cleaning machine enters the inner liner to fix the inner liner; S82, use high-pressure water spray or ultrasonic cleaning to clean the inner cavity of the double-head high-pressure gas cylinder to remove processing pollutants. 7 . The method for manufacturing the inner liner of a double-head high-pressure gas cylinder according to claim 1 , wherein the cleaning machine in the step S13 is a rotary spray cleaning machine or an ultrasonic cleaning machine. 8 . 8 . The method for manufacturing the inner liner of a double-head high-pressure gas cylinder according to claim 1 , wherein the cleaning of the spinning tube of the aluminum alloy inner liner is completed by heating a neutral cleaning agent at 30-45° C. 9 . 9 . The method for manufacturing the inner liner of a double-head high-pressure gas cylinder according to claim 1 , wherein after the spinning tube of the aluminum alloy inner liner is cleaned, a drying appliance or a drying device is used to remove residual water stains on the surface. 10 . 10 . The method for manufacturing the inner liner of a double-head high-pressure gas cylinder according to claim 4 , wherein the clamping tool of the spin-formed part C is a split hollow clamping tool. 11 . 11 . The method for manufacturing the inner liner of a double-head high-pressure gas cylinder according to claim 4 , wherein the grinding of the inner profile of the head is a numerical control automatic grinding mechanism, which can be independently executed by programming. 12 . 12. The method for manufacturing a double-head high-pressure gas cylinder liner according to claim 1, wherein the quenching furnace is a vertical aluminum alloy box-type quenching furnace; the aging furnace is a trolley-type aluminum alloy aging furnace furnace.

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