CN117442851A - Large-size balloon end stretch forming process - Google Patents
Large-size balloon end stretch forming process Download PDFInfo
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- CN117442851A CN117442851A CN202311452412.4A CN202311452412A CN117442851A CN 117442851 A CN117442851 A CN 117442851A CN 202311452412 A CN202311452412 A CN 202311452412A CN 117442851 A CN117442851 A CN 117442851A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 40
- 210000005077 saccule Anatomy 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000009423 ventilation Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 210000003128 head Anatomy 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 210000002376 aorta thoracic Anatomy 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000001105 femoral artery Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 210000002254 renal artery Anatomy 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M25/1027—Making of balloon catheters
- A61M25/1029—Production methods of the balloon members, e.g. blow-moulding, extruding, deposition or by wrapping a plurality of layers of balloon material around a mandril
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
- A61M25/001—Forming the tip of a catheter, e.g. bevelling process, join or taper
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M25/1002—Balloon catheters characterised by balloon shape
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M25/1027—Making of balloon catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3368—Temperature
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/36—General characteristics of the apparatus related to heating or cooling
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2207/00—Methods of manufacture, assembly or production
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biophysics (AREA)
- Pulmonology (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Child & Adolescent Psychology (AREA)
- Manufacturing & Machinery (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
The invention aims to provide a large-size balloon end stretch forming process capable of thinning balloon ends, wherein two sides of a balloon are stretched step by step, after a balloon shoulder and a balloon neck section on one side are stretched first, the balloon shoulder and the balloon neck section on the other side are stretched, and according to the material characteristics, the speed on the left side and the speed on the right side are different when the balloon is stretched for the second time, the qualification rate of the produced balloon, namely the shoulder and the neck is higher, and the performance is more stable. The thickness of the end part can be reduced by 70% and the thickness of the thin neck can be reduced by 60% through the process, and the diameter of the thin neck can be reduced by 50% at the same time, so that the requirements of welding and folding and pressing holding of the TPU big saccule in the later stage can be met.
Description
Technical Field
The invention relates to the technical field of medical instrument manufacturing, in particular to a large-size balloon end stretch forming process.
Background
Aortic balloon counterpulsation (IABP) is a treatment method in which a balloon is placed between the descending aorta and the renal artery by a femoral artery puncture method, and is driven and controlled by an aortic balloon counterpulsation pump to start inflation in the diastole and to deflate at the end of the diastole, so that the aims of increasing coronary perfusion and reducing heart load are achieved. The balloon is an important component of an IABP balloon catheter, and the performance of the balloon directly determines the performance of the IABP balloon catheter.
The aortic counterpulsation saccule belongs to a large-diameter saccule, after preliminary shaping processing is carried out on the saccule, the length, the diameter and the thickness of the middle part of the saccule basically meet the requirements, and the two ends of the saccule are far away from a heating module and a cooling module relative to a central cavity, so that the temperature rising and falling reaction is slow, the temperature is lower than the position of the central cavity, and the stretching of the end part of the saccule is not in place. Specifically, the end of the balloon comprises a tapered shoulder and a thin neck, wherein the thickness of the balloon shoulder is thicker to influence the later folding press grip; meanwhile, the phenomenon that the diameters of the thin neck parts at the two ends are larger and the thicknesses are thicker can cause the problems that the assembly clearance is overlarge or the diameters of welding folds and welding parts are overlarge after welding when the distal end and the proximal end are assembled with the TIP head and the catheter later, and finally the whole maximum diameter of the balloon is overlarge, and a series of adverse problems that a larger puncture opening is needed or the trafficability of the balloon is reduced and the like are required to be opened when the balloon is used.
Disclosure of Invention
The invention aims to provide a large-size balloon end stretch forming process capable of thinning balloon ends.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a large-size balloon end stretch forming process comprises the following steps:
s1), placing the preliminarily stretched balloon in a re-stretching die, placing the straight balloon tube section in a constant-temperature water jacket, placing the balloon shoulder in a heat insulation sleeve, and placing the balloon neck section in a heating die; the balloon after preliminary stretching is provided with a balloon straight pipe section and a balloon shoulder, but the balloon shoulder is thicker in material, and the diameter of the material pipe part outside the shoulder is larger, so that the balloon is required to be stretched again, and when the balloon is stretched again, only the part required to be stretched, namely the balloon shoulder and the material pipe section are heated, and other parts (namely the balloon straight pipe section) are not required to be stretched.
S2), connecting two ends of the pipe with a numerical control tension machine respectively, wherein one end of the pipe is closed, the other end of the pipe is communicated with an air source, and the two ends of the balloon are kept closed, and the pipe is stretched under a pressure-maintaining state;
s3), keeping the temperature of the constant-temperature water jacket at T1, heating the heating die to T2, then stretching the processing end material pipe outwards at the speed of V1, wherein the thickness of the balloon shoulder is thinned, and the balloon neck section is formed at the same time, but the diameter of the balloon neck section is smaller and the thickness is thicker, the balloon and the stretching section are immediately retracted into the constant-temperature water jacket after the stretching is completed, and the temperature of the stretched balloon shoulder is reduced and shaped immediately.
S4) completely placing the balloon neck section in a heating cavity of a heating die in a ventilation state of the balloon, and then stretching and blowing the balloon neck section;
s5) heating the balloon neck section to a temperature T2, then stretching for a time T1 at the speed of the left side V2 and the right side V3, wherein the step mainly comprises the steps of stretching and blowing the balloon neck section with smaller pipe diameter and thicker thickness in the step S3) to enable the balloon neck section with smaller pipe diameter and thicker thickness to form the balloon neck section with larger pipe diameter and smaller thickness, returning the balloon and the stretching section to the inside of the constant-temperature water jacket immediately after the stretching is finished, and cooling and shaping the stretched balloon neck section.
S6), turning the balloon direction, and repeating the steps S1), S2), S3) and S4);
s7), heating the neck to T2 in the ventilation state of the balloon, and then stretching for time T1 at the speed of V4 on the left side and V3 on the right side, wherein the step mainly comprises the steps of stretching and blowing the balloon neck section with smaller pipe diameter and thicker pipe diameter at the other end, so that the balloon neck section with larger pipe diameter and smaller thickness is formed by the balloon neck section with smaller pipe diameter and thicker thickness, returning the balloon and the stretching section to the inside of the constant-temperature water jacket immediately after stretching, and cooling and shaping the stretched balloon neck section, wherein the speed V4 is larger than V2;
s8), taking out the balloon.
The inner diameter of the constant temperature water jacket is 2mm larger than the standard diameter of the balloon, and the length is 30cm larger than the standard length of the balloon. This is because the balloon may retract during the sizing process.
In the step S2), the numerical control pulling machine gives pulling force of 5N-8N to the two ends of the balloon, and the balloon is internally filled with air pressure of 15 kpa-30 kpa.
In step S4), the boundary between the balloon shoulder and the balloon neck section should be located at the same position as the heating cavity boundary of the heating mold, and only the neck section is precisely heated.
In the step S5) and the step S7), when the balloon and the stretching section are retracted into the constant temperature water jacket, the numerical control pulling machines at the two ends of the balloon synchronously act, so that the distance between the two ends of the balloon material pipe is not changed.
Further, V1 is in the range of 5mm/s to 10mm/s.
Further, the value range of V2 is 3 mm/s-5 mm/s, the value range of V3 is 2 mm/s-4 mm/s, and the value range of V4 is 3.5 mm/s-5.5 mm/s.
Further, the constant temperature water jacket has a temperature T1 ranging from 10 ℃ to 18 ℃ and a heating die temperature T2 ranging from 120 ℃ to 180 ℃.
The value range of the stretching time t1 is 8 s-18 s.
The axis of the numerical control tension machine is coincident with the axis of the balloon and is arranged in the horizontal direction, so that the uniformity of material rearrangement in the stretching process is ensured.
In the scheme, the two sides of the balloon are stretched step by step, after the balloon shoulder and the balloon neck section on one side are stretched first, the balloon shoulder and the balloon neck section on the other side are stretched, and the speed on the left side and the speed on the right side are different when the balloon is stretched for the second time according to the material characteristics, so that the qualification rate of the produced balloon is higher no matter the balloon shoulder or the neck section, and the performance is more stable. The thickness of the end part can be reduced by 70% and the thickness of the thin neck can be reduced by 60% through the process, and the diameter of the thin neck can be reduced by 50% at the same time, so that the requirements of welding and folding and pressing holding of the TPU big saccule in the later stage can be met.
Drawings
FIG. 1 is a schematic structural view of a balloon;
fig. 2 is a schematic diagram of the cooperation of the balloon with the redrawing die.
Detailed Description
For ease of understanding, it is necessary to briefly introduce the entire molding process of the balloon. Firstly, a constant-diameter material pipe is taken, the diameter of the material pipe is small, the wall thickness of the material pipe is large, then the material pipe is heated and pressurized under the condition of ventilation and pressure maintaining, then a specific pipe section on the material pipe is expanded into a balloon straight pipe section 1, the diameter of the material pipe outside the specific pipe section is almost unchanged, a balloon shoulder 2 with a certain taper is formed at the part between the balloon straight pipe section 1 and the material pipe, and the distal end and the proximal end pipe sections of the balloon shoulder 2 are stretched to be thinner and are respectively welded with a distal TIP head and a proximal end catheter. After the tube is pre-stretched, the straight balloon segment 1 is stretched in place, but the portions of the balloon shoulder 2 at both ends of the straight balloon segment 1 and the distal and proximal balloon segments at the balloon shoulder 2 are not stretched in place, so that the balloon shoulder 2 also needs to be stretched in place, and the distal and proximal balloon segments at the balloon shoulder 2 need to be stretched into a balloon neck segment 3 welded to the TIP head and the proximal catheter. The invention is thus directed to a process for re-stretching a pre-stretched balloon.
Firstly, a re-stretching die comprises three parts, namely a constant-temperature water jacket A, a heat insulation sleeve B and a heating die C, wherein the heating die C heats a material pipe part which is to form a balloon neck section 3, the material of the balloon neck area is re-arranged, and the balloon neck area is remolded to be stretched to form the balloon neck section 3; since the straight balloon tube section 1 is already stretched to the target degree in the pre-stretching stage, the straight balloon tube section 1 is not expected to be stretched again in the process of re-stretching, and the straight balloon tube section 1 is placed in the constant-temperature water jacket A and cannot be stretched and deformed due to the lower temperature of the straight balloon tube section; in view of the fact that the balloon shoulder 2 is basically stretched in place in terms of shape, inner diameter and the like after being prestretched, but the thickness is still larger, the thickness is required to be stretched to be thin, and therefore the section is required to be heated, but cannot be overheated.
Example 1
First, the balloon was connected to both ends of the electric stretching stage in the order shown in the figure, a tensile force of 5N was given, and an air pressure of 20kpa was inflated, and both ends of the balloon were maintained to be closed. The processing end of the balloon is tightly attached to the end baffle, and the processing side material pipe bears the tension of 9N. And heating the heating die to 120 ℃, then stretching the processing end material pipe outwards for 30mm at a speed of 6mm/s, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket after the stretching is finished, wherein the distance between the two ends of the balloon material pipe is not changed.
Next, a 1.5N pulling force was given to the balloon, and a 3kpa air pressure was applied and both ends of the balloon were maintained closed. The balloon neck is completely placed in the heating cavity, and the boundary between the end part and the balloon neck is at the same position as the boundary of the heating cavity. The neck was heated to 120℃and then stretched at a speed of 5mm/s on the left and 3mm/s on the right for 15s. And after the stretching is finished, the balloon and the stretching section are retracted into the constant-temperature water jacket, and the distance between the two ends of the balloon material pipe is not changed.
Then, the balloon was turned over, the balloon was connected to both ends of the electric stretching stage in the order shown in the figure, a tensile force of 5N was given, and an air pressure of 20kpa was inflated, and both ends of the balloon were maintained closed. The processing end of the balloon is tightly attached to the end baffle, and the processing side material pipe bears the tension of 9N. And heating the heating die to 120 ℃, then stretching the processing end material pipe outwards for 30mm at a speed of 6mm/s, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket after the stretching is finished, wherein the distance between the two ends of the balloon material pipe is not changed.
Finally, a 1.5N pulling force was applied to the balloon and a 3kpa air pressure was applied and the balloon was maintained closed at both ends. The balloon neck is completely placed in the heating cavity, and the boundary between the end part and the balloon neck is at the same position as the boundary of the heating cavity. The neck was heated to 120℃and then stretched at a speed of 5.5mm/s on the left and 3mm/s on the right for 15s, immediately after stretching was completed the balloon and stretch section were retracted inside the thermostatic water jacket.
Example 2
First, the balloon was connected to both ends of the electric stretching stage in the order shown in the figure, a tensile force of 6N was given, and an air pressure of 25kpa was inflated, and both ends of the balloon were maintained to be closed. The balloon processing end is tightly attached to the end baffle plate, and the processing side material pipe bears the tensile force of 10N. And heating the heating die to 145 ℃, then stretching the processing end material pipe outwards for 30mm at a speed of 6mm/s, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket after the stretching is finished, wherein the distance between the two ends of the balloon material pipe is not changed.
Next, a 1.5N pulling force was given to the balloon, and a 3kpa air pressure was applied and both ends of the balloon were maintained closed. The balloon neck is completely placed in the heating cavity, and the boundary between the end part and the balloon neck is at the same position as the boundary of the heating cavity. The neck was heated to 145℃and then stretched at a speed of 4mm/s on the left and 3mm/s on the right for 12s. And after the stretching is finished, the balloon and the stretching section are retracted into the constant-temperature water jacket, and the distance between the two ends of the balloon material pipe is not changed.
Then, the balloon was turned over, the balloon was connected to both ends of the electric stretching stage in the order shown in the figure, a tensile force of 6N was given, and an air pressure of 25kpa was inflated, and both ends of the balloon were maintained closed. The processing end of the balloon is tightly attached to the end baffle, and the processing side material pipe bears the tension of 9N. And heating the heating die to 145 ℃, then stretching the processing end material pipe outwards for 30mm at a speed of 6mm/s, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket after the stretching is finished, wherein the distance between the two ends of the balloon material pipe is not changed.
Finally, a 1.5N pulling force was applied to the balloon and a 3kpa air pressure was applied and the balloon was maintained closed at both ends. The balloon neck is completely placed in the heating cavity, and the boundary between the end part and the balloon neck is at the same position as the boundary of the heating cavity. The neck was heated to 145℃and then stretched at a rate of 4.5mm/s on the left and 3mm/s on the right for 12s, immediately after stretching was completed, the balloon and stretch section were retracted inside the thermostatic water jacket.
Example 3
First, the balloon was connected to both ends of the electric stretching stage in the order shown in the figure, a tensile force of 8N was given, and an air pressure of 30kpa was inflated, and both ends of the balloon were maintained to be closed. The balloon processing end is tightly attached to the end baffle plate, and the processing side material pipe bears the tensile force of 10N. And heating the heating die to 180 ℃, then stretching the processing end material pipe outwards for 30mm at a speed of 5mm/s, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket after the stretching is finished, wherein the distance between the two ends of the balloon material pipe is not changed.
Next, a 1.5N pulling force was given to the balloon, and a 3kpa air pressure was applied and both ends of the balloon were maintained closed. The balloon neck is completely placed in the heating cavity, and the boundary between the end part and the balloon neck is at the same position as the boundary of the heating cavity. The neck was heated to 180℃and then stretched at a rate of 3mm/s on the left and 2mm/s on the right for 8s. And after the stretching is finished, the balloon and the stretching section are retracted into the constant-temperature water jacket, and the distance between the two ends of the balloon material pipe is not changed.
Then, the balloon was turned over, the balloon was connected to both ends of the electric stretching stage in the order shown in the figure, a tensile force of 8N was given, and an air pressure of 30kpa was inflated, and both ends of the balloon were maintained closed. The processing end of the balloon is tightly attached to the end baffle, and the processing side material pipe bears the tensile force of 7N. And heating the heating die to 180 ℃, then stretching the processing end material pipe outwards for 30mm at a speed of 5mm/s, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket after the stretching is finished, wherein the distance between the two ends of the balloon material pipe is not changed.
Finally, a 1.5N pulling force was applied to the balloon and a 3kpa air pressure was applied and the balloon was maintained closed at both ends. The balloon neck is completely placed in the heating cavity, and the boundary between the end part and the balloon neck is at the same position as the boundary of the heating cavity. The neck was heated to 180℃and then stretched at a rate of 3.5mm/s on the left and 2mm/s on the right for 8s, immediately after stretching was completed, the balloon and stretch section were retracted inside the thermostatic water jacket.
Comparative examples
The two ends of the balloon are stretched simultaneously, the balloon is connected to the two ends of the electric stretching platform according to the tensile force of 6N, the air pressure of 25kpa is filled, and the two ends of the balloon are kept closed. The balloon processing end is tightly attached to the end baffle plate, and the processing side material pipe bears the tensile force of 10N. The heated mold was heated to 145 ℃, followed by stretching the process end tube outwardly at a speed of 6mm/s for 30mm, and then, a tension of 1.5N was given to the balloon, and an air pressure of 3kpa was inflated, and both ends of the balloon were maintained closed. The balloon neck is completely placed in the heating cavity, and the boundary between the end part and the balloon neck is at the same position as the boundary of the heating cavity. The neck was heated to 145℃and then stretched at a speed of 4mm/s on the left and 4mm/s on the right for 12s.
The performance of the balloons according to examples 1-3 and the comparative examples is shown in the following table:
TABLE 1
| Category(s) | Shoulder yield (%) | Thin neck yield (%) | Blasting pressure (atm) |
| Example 1 | 84 | 86 | 1.8 |
| Example 2 | 87 | 82 | 1.5 |
| Example 3 | 77 | 79 | 2.1 |
| Comparative examples | 16 | 30 | 1.7 |
As can be seen from Table 1, the balloons produced by the present invention were higher in yield, and more stable in performance, both in the shoulder and in the neck. The thickness of the end part can be reduced by 70% and the thickness of the thin neck can be reduced by 60% through the process, and the diameter of the thin neck can be reduced by 50% at the same time, so that the requirements of welding and folding and pressing holding of the TPU big saccule in the later stage can be met.
The foregoing has outlined and described the basic principles, main features and features of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The large-size balloon end stretch forming process is characterized by comprising the following steps of:
s1), placing the preliminarily stretched balloon in a re-stretching die, placing the straight balloon tube section (1) in a constant-temperature water jacket (A), placing the balloon shoulder (2) in a heat insulation sleeve (B), and placing the balloon neck section (3) in a heating die (C);
s2), connecting two ends of the pipe with a numerical control tension machine respectively, wherein one end of the pipe is closed, the other end of the pipe is communicated with an air source, and the two ends of the balloon are kept closed;
s3) keeping the temperature of the constant-temperature water jacket (A) at T1, heating the heating die (C) to T2, then stretching the processing end material pipe outwards at the speed of V1, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket (A) after the stretching is completed;
s4) completely placing the balloon neck section (3) in a heating cavity of the heating die (C) in the ventilation state of the balloon;
s5), heating the balloon neck section (3) to a temperature T2, and then drawing for a time T1 at the speed of the left side V2 and the right side V3, wherein the balloon and the drawing section are immediately retracted into the constant-temperature water jacket (A) after drawing is completed;
s6), turning the balloon direction, and repeating the steps S1), S2), S3) and S4);
s7), heating the neck to T2 under the ventilation state of the balloon, stretching for time T1 at the speed of the left side V4 and the right side V3, and immediately returning the balloon and the stretching section to the inside of the constant-temperature water jacket (A) after the stretching is finished, wherein the speed V4 is larger than V2;
s8), taking out the balloon.
2. The large-size balloon end stretch-forming process according to claim 1, wherein: the inner diameter of the constant temperature water jacket (A) is 2mm larger than the standard diameter of the balloon, and the length is 30cm larger than the standard length of the balloon.
3. The large-size balloon end stretch-forming process according to claim 1, wherein: in the step S2), the numerical control pulling machine gives pulling force of 5N-8N to the two ends of the balloon, and the balloon is internally filled with air pressure of 15 kpa-30 kpa.
4. The large-size balloon end stretch-forming process according to claim 1, wherein: in step S4), the boundary of the balloon shoulder (2) and the balloon neck section (3) should be co-located with the heating cavity boundary of the heating mould (C).
5. The large-size balloon end stretch-forming process according to claim 1, wherein: in the step S5) and the step S7), when the balloon and the stretching section are retracted into the constant temperature water jacket (A), the numerical control pulling machines at the two ends of the balloon synchronously act, so that the distance between the two ends of the balloon pipe is not changed.
6. The large-size balloon end stretch-forming process according to claim 1, wherein: v1 is 5mm/s to 10mm/s.
7. The large-size balloon end stretch-forming process according to claim 1, wherein: v2 is 3-5 mm/s, V3 is 2-4 mm/s, and V4 is 3.5-5.5 mm/s.
8. The large-size balloon end stretch-forming process according to claim 1, wherein: the value range of the temperature T1 of the constant-temperature water jacket (A) is 10-18 ℃, and the value range of the temperature T2 of the heating die is 120-180 ℃.
9. The large-size balloon end stretch-forming process according to claim 1, wherein: the value range of the stretching time t1 is 8 s-18 s.
10. The large-size balloon end stretch-forming process according to claim 1, wherein: the axis of the numerical control tension machine is coincident with the axis of the saccule and is arranged in the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311452412.4A CN117442851A (en) | 2023-11-03 | 2023-11-03 | Large-size balloon end stretch forming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311452412.4A CN117442851A (en) | 2023-11-03 | 2023-11-03 | Large-size balloon end stretch forming process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117442851A true CN117442851A (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311452412.4A Pending CN117442851A (en) | 2023-11-03 | 2023-11-03 | Large-size balloon end stretch forming process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117442851A (en) |
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2023
- 2023-11-03 CN CN202311452412.4A patent/CN117442851A/en active Pending
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