Forming device and forming method for thermoplastic special-shaped pipe
阅读说明：本技术 一种热塑性异形管材的成型装置及成型方法 (Forming device and forming method for thermoplastic special-shaped pipe ) 是由 姚佳楠 于有海 陈春海 马驰 王力风 刘刚 李慧 于 2020-06-11 设计创作，主要内容包括：本发明提供了一种热塑性异形管材的成型装置及成型方法,属于材料成型领域。本发明提供的成型装置利用限位块的弧形凹槽和成型块的弧形凹槽固定待弯曲的热塑性管材,加热后,利用挤压调节装置控制成型块的滑动,以实现待弯曲的热塑性管材的精确弯曲,冷却后拆卸成型装置,避免定型后回弹,成型装置的各部件由耐高温、机械强度高的铁、不锈钢和碳钢中的一种或多种材料组成,适用于机械性能高的高性能热塑性管材的异形成型,同时能够满足不同结构热塑性异形管材的需求,管材在挤压弯曲过程中受力均匀,避免出现褶皱、凹陷、折断、失圆的问题,成型效率高且成本低,能实现现场成型并装配,与目标形状一致,抽出弹簧后管材回弹仅1～2°。(The invention provides a forming device and a forming method for a thermoplastic special-shaped pipe, and belongs to the field of material forming. The forming device provided by the invention utilizes the arc-shaped groove of the limiting block and the arc-shaped groove of the forming block to fix the thermoplastic pipe to be bent, utilizes the extrusion adjusting device to control the sliding of the forming block after heating, so as to realize the accurate bending of the thermoplastic pipe to be bent, the forming device is disassembled after cooling, the springback after shaping is avoided, each part of the forming device is composed of one or more materials of iron, stainless steel and carbon steel with high temperature resistance and high mechanical strength, and is suitable for the special-shaped forming of the high-performance thermoplastic pipe with high mechanical property, can satisfy the demand of not isostructure thermoplasticity dysmorphism tubular product simultaneously, the tubular product atress is even at extrusion bending process, avoids appearing fold, sunken, rupture, out of round problem, and shaping efficiency is high and with low costs, can realize on-the-spot shaping and assembly, and unanimous with the target shape, the tubular product resilience is only 1 ~ 2 after taking out the spring.)
1. A molding device for thermoplastic special-shaped pipes comprises a supporting base plate (1), at least two limiting blocks (2), a molding block (3) and an extrusion adjusting device (4);
the supporting bottom plate (1) is a flat plate which is T-shaped in the horizontal direction;
the limiting blocks (2) are detachably arranged at two ends of a T-shaped middle part of the supporting bottom plate (1) and axially rotate relative to the vertical direction of the supporting bottom plate (1); an arc-shaped groove (5) is formed in one side face of the limiting block (2);
the forming block (3) is detachably arranged on the 'I' part in the 'T' shape and can slide in two directions on the plane of the 'I' part and perpendicular to the direction of the 'T' -part; the forming block (3) is provided with an arc-shaped side surface, the arc-shaped side surface is arranged opposite to the middle part of the T shape, and an arc-shaped groove (6) is arranged on the arc-shaped side surface;
the extrusion adjusting device (4) is arranged at the end head of the I-shaped part in the T shape, is connected with the forming block (3) and controls the sliding of the forming block (3);
the material of the forming device of the thermoplastic special-shaped pipe comprises one or more of iron, stainless steel and carbon steel.
2. The molding device as defined in claim 1, characterized in that the support base plate (1) is provided with a limiting hole (7); the limiting hole (7) is used for detachably mounting the limiting block (2).
3. The forming device according to claim 1, characterized in that the extrusion adjusting device (4) is provided with scale marks, and the radian of each advanced scale mark corresponding to the bending shape of the pipe to be bent is increased by 0.5-1.5 rad.
4. The forming device according to claim 1, characterized in that the arc and diameter of the arc-shaped groove (5) match the diameter of the pipe to be formed by bending.
5. A molding method of a thermoplastic special-shaped pipe comprises the following steps:
(1) placing a metal spring as an internal supporting material in the thermoplastic pipe to obtain the thermoplastic pipe to be bent;
(2) assembling the thermoplastic pipe to be bent in the step (1) into the forming device of any one of claims 1-4, heating to a deformation temperature, and bending to obtain a deformed thermoplastic pipe;
(3) and (3) cooling the deformed thermoplastic pipe in the step (2), disassembling the forming device, and extracting the internal support material to obtain the thermoplastic special-shaped pipe.
6. The molding method according to claim 5, wherein the clearance between the metal spring and the inner wall of the thermoplastic pipe in the step (1) is 0.05 to 1 mm.
7. The molding method according to claim 5, wherein the heating in the step (2) is temperature programming, and the temperature programming rate is 5-30 ℃/min.
8. The molding method according to claim 5, wherein the temperature of deformation in the step (2) is 150 to 330 ℃.
9. The molding method according to claim 5, wherein when the thermoplastic pipe in step (1) is a crystalline high performance thermoplastic material, the cooling in step (3) is performed by: cooling to the glass transition temperature of the crystalline high-performance thermoplastic material at the speed of 3-8 ℃/min; when the thermoplastic pipe in the step (1) is an amorphous high-performance thermoplastic material, the cooling mode in the step (3) is as follows: cooling to room temperature at the speed of 10-55 ℃/min.
10. The method of forming as defined in claim 5, wherein the metal spring comprises one of a carbon steel spring, an alloy steel spring, a copper alloy spring, and a nickel alloy spring.
Technical Field
The invention relates to the field of material forming, in particular to a forming device and a forming method of a thermoplastic special-shaped pipe.
Background
The high-performance thermoplastic pipe has the advantages of high temperature resistance, chemical solvent resistance, low temperature resistance, irradiation resistance, aging resistance, high mechanical performance and the like, is widely applied to the fields of aviation, aerospace, nuclear industry and the like, and can replace an aluminum alloy pipe to achieve the purpose of reducing weight of a structure, such as an oil circuit system pipe, a liquid cooling system pipe, a steam system pipe and the like. However, the pipe system often encounters problems such as a special-shaped structure in the assembling process of a machine or equipment, and sometimes the special-shaped pipe is formed and assembled on site.
Disclosure of Invention
The invention aims to provide a forming device and a forming method for a thermoplastic special-shaped pipe.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a molding device of a thermoplastic special-shaped pipe, which comprises a supporting base plate 1, at least two limiting blocks 2, a molding block 3 and an extrusion adjusting device 4, wherein the supporting base plate is provided with a plurality of limiting blocks;
the supporting bottom plate 1 is a flat plate which is T-shaped in the horizontal direction;
the limiting blocks 2 are detachably arranged at two ends of a T-shaped middle part of the supporting bottom plate 1 and can axially rotate relative to the vertical direction of the supporting bottom plate 1; an arc-shaped groove 5 is formed in one side face of the limiting block 2;
the forming block 3 is detachably arranged on the 'I' part in the 'T' shape and can bidirectionally slide in the direction perpendicular to the 'I' part on the plane of the 'I' part; the forming block 3 is provided with an arc-shaped side surface, the arc-shaped side surface is arranged opposite to the middle part of the T shape, and an arc-shaped groove 6 is arranged on the arc-shaped side surface;
the extrusion adjusting device 4 is arranged at the end of the I-shaped part in the T shape, is connected with the forming block 3 and controls the sliding of the forming block 3;
the forming device of the thermoplastic special-shaped pipe comprises one or more of iron, stainless steel and carbon steel.
Preferably, the supporting bottom plate 1 is provided with a
Preferably, the extrusion adjusting device 4 is provided with scale marks, and the radian of the pipe to be bent corresponding to the curve shape of the pipe to be bent is increased by 0.5-1.5 rad when one scale mark is pushed.
Preferably, the radian and the diameter of the arc-shaped groove 5 are matched with the diameter of a pipe to be bent and formed.
The invention also provides a molding method of the thermoplastic special-shaped pipe, which comprises the following steps:
(1) placing a metal spring as an internal supporting material in the thermoplastic pipe to obtain the thermoplastic pipe to be bent;
(2) assembling the thermoplastic pipe to be bent in the step (1) into the forming device in the technical scheme, heating to a deformation temperature, and bending to obtain a deformed thermoplastic pipe;
(3) and (3) cooling the deformed thermoplastic pipe in the step (2), disassembling the forming device, and extracting the internal support material to obtain the thermoplastic special-shaped pipe.
Preferably, the clearance between the metal spring and the thermoplastic pipe in the step (1) is 0.05-1 mm.
Preferably, the heating in the step (2) is temperature programming, and the temperature programming rate is 5-30 ℃/min.
Preferably, the deformation temperature in the step (2) is 150-330 ℃.
Preferably, when the thermoplastic pipe in step (1) is a crystalline high performance thermoplastic material, the cooling in step (3) is performed by: cooling to the glass transition temperature of the crystalline high-performance thermoplastic material at the speed of 3-8 ℃/min; when the thermoplastic pipe in the step (1) is an amorphous high-performance thermoplastic material, the cooling mode in the step (3) is as follows: cooling to room temperature at the speed of 10-55 ℃/min.
Preferably, the metal spring comprises one of a carbon steel spring, an alloy steel spring, a copper alloy spring, and a nickel alloy spring.
The invention provides a molding device of a thermoplastic special-shaped pipe, which comprises a supporting bottom plate, at least two limiting blocks, a molding block and an extrusion adjusting device, wherein the supporting bottom plate 1 is a flat plate which is T-shaped in the horizontal direction;
the limiting blocks 2 are detachably arranged at two ends of a T-shaped middle part of the supporting base 1 and axially rotate relative to the vertical direction of the supporting base plate 1; an arc-shaped groove 5 is formed in one side face of the limiting block 2;
the forming block 3 is detachably arranged on the 'I' part in the 'T' shape and can bidirectionally slide in the direction perpendicular to the 'I' part on the plane of the 'I' part; the forming block 3 is provided with an arc-shaped side surface, the arc-shaped side surface is arranged opposite to the middle part of the T shape, and an arc-shaped groove 6 is arranged on the arc-shaped side surface;
the extrusion adjusting device 4 is arranged at the end of the I-shaped part in the T shape, is connected with the forming block 3 and controls the sliding of the forming block 3;
the forming device of the thermoplastic special-shaped pipe comprises one or more of iron, stainless steel and carbon steel.
The invention utilizes the arc-shaped grooves of the limiting blocks arranged at the two ends of the middle part and the forming block on the I part of the T-shaped supporting base plate to fix the thermoplastic pipe to be bent, controls the sliding of the forming block by using the extrusion adjusting device after heating so as to realize the accurate bending of the thermoplastic pipe to be bent, and detaches the forming device after cooling so as to avoid rebounding after shaping, thereby realizing the purpose of on-site rapid forming. The arc-shaped groove of the limiting block and the arc-shaped groove of the forming block enable the pipe to be stressed uniformly in the extrusion bending process, the problems of folding, sinking, breaking and out of round are avoided, the forming efficiency is high, the cost is low, and the on-site forming and assembling can be realized. The result of the embodiment shows, utilize the forming device that this application provided, can on-the-spot quick shaping, obtained the high performance thermoplasticity dysmorphism tubular product of isostructure, and the crooked radian of the special-shaped tubular product obtained is accurate controllable, and the pipe wall is smooth, does not appear the problem of fold, sunken, rupture, out of round, is unanimous with the target shape, and the tubular product resilience is only 1 ~ 2 after taking out the spring.
Drawings
Fig. 1 is a schematic structural diagram of a molding device for a thermoplastic special-shaped pipe in an embodiment of the invention, wherein 1 is a supporting base plate, 2 is a limiting block, 3 is a molding block, 4 is an extrusion adjusting device, 5 is an arc-shaped groove on the limiting block, 6 is an arc-shaped groove on the molding block, and 7 is a limiting hole;
FIG. 2 is a schematic structural view of shaped blocks of different curvatures and diameters in an embodiment of the present invention;
FIG. 3 is a diagram of a thermoplastic profile pipe obtained in example 1 of the present invention;
FIG. 4 is a diagram of a thermoplastic profile pipe obtained in example 2 of the present invention;
fig. 5 is a schematic structural view of a metal spring used in an embodiment of the present invention.
Detailed Description
The invention provides a molding device of a thermoplastic special-shaped pipe, which comprises a supporting base plate 1, at least two limiting blocks 2, a molding block 3 and an extrusion adjusting device 4, wherein the supporting base plate is provided with a plurality of limiting blocks; the supporting bottom plate 1 is a flat plate which is T-shaped in the horizontal direction; the limiting blocks 2 are detachably arranged at two ends of a T-shaped middle part of the supporting bottom plate 1 and can axially rotate relative to the vertical direction of the supporting bottom plate 1; an arc-shaped groove 5 is formed in one side face of the limiting block 2; the forming block 3 is detachably arranged on the 'I' part in the 'T' shape and can bidirectionally slide in the direction perpendicular to the 'I' part on the plane of the 'I' part; the forming block 3 is provided with an arc-shaped side surface, the arc-shaped side surface is arranged opposite to the middle part of the T shape, and an arc-shaped groove 6 is arranged on the arc-shaped side surface; the extrusion adjusting device 4 is arranged at the end of the I-shaped part in the T shape, is connected with the forming block 3 and controls the sliding of the forming block 3; the forming device of the thermoplastic special-shaped pipe comprises one or more of iron, stainless steel and carbon steel.
In the embodiment of the present invention, as shown in fig. 1, the forming device for the thermoplastic profile tube comprises a supporting base plate 1. In the invention, the support bottom plate is a flat plate which is T-shaped in the horizontal direction. The size of the supporting bottom plate is not specially limited, and the size can be adjusted according to the use requirement. In the invention, the supporting bottom plate plays a role in supporting the bottom, and the supporting bottom plate is combined with the limiting block and the forming block to play a role in fixing the thermoplastic pipe to be bent.
As shown in FIG. 1, in the embodiment of the invention, the forming device for the thermoplastic profiled tubing comprises at least two limiting blocks 2. In the invention, the limiting blocks 2 are detachably arranged at two ends of a T-shaped middle part of the supporting bottom plate 1 and can axially rotate relative to the vertical direction of the supporting bottom plate 1; and one side surface of the limiting block 2 is provided with an arc-shaped groove 5. In the use process, the arc-shaped groove 5 is in contact with a pipe to be bent and formed, and the limiting block 2 rotates along with the bending process of the pipe. In the invention, the arc-shaped groove 5 arranged on the side surface of the limiting block 2 is used for fixing the thermoplastic pipe to be bent. In the invention, the positions of the two ends of the T-shaped middle part of the support bottom plate 1 of the limiting block 2 and the rotating angle of the limiting block 2 are adjusted to realize the purpose of accurately controlling different bending radians and meet the requirements of thermoplastic special-shaped pipes with different structures.
In one embodiment of the invention, the radian and the diameter of the arc-shaped groove 5 are matched with the diameter of the pipe to be bent and formed.
As shown in fig. 1, in an embodiment of the present invention, a
In the embodiment of the present invention, as shown in fig. 1, the forming device of the thermoplastic shaped tube comprises the forming block 3. In the present invention, the forming block 3 is detachably disposed on the "|" portion of the "T" shape and can slide bidirectionally in the direction perpendicular to the "-" portion on the plane of the "|" portion; the forming block 3 is provided with an arc-shaped side face, the arc-shaped side face is opposite to the middle part of the T shape, and an arc-shaped groove 6 is formed in the arc-shaped side face.
The present invention is not particularly limited to the connection manner of the molding block 3 and the "|" portion in the "T" shape, and the molding block 3 may be slid in a direction perpendicular to the "-" portion on the plane of the "|" portion in both directions. In the present invention, the forming block 3 is preferably connected to the "|" portion of the "T" shape by rolling beads, screwing or punching and quick-inserting structure.
In the embodiment of the invention, the radian and the diameter of the arc-shaped groove 6 are matched with the diameter of the pipe to be bent and formed. In the invention, the arc-shaped groove 6 is used for fixing the thermoplastic pipe to be bent in cooperation with the arc-shaped groove 5, the stress of the pipe is uniform in the extrusion bending process, the problems of folding, sinking, breaking and out of round are avoided, and the forming efficiency is improved.
In the embodiment of the invention, the radian of the arc-shaped side surface of the forming block 3 is matched with the maximum radian of the bent shape of the target special-shaped pipe. In the invention, the radian of the arc-shaped side surface of the forming block 3 and the position of the bidirectional sliding in the direction vertical to the' -part are adjusted to realize the purpose of accurately controlling different bending radians and meet the requirements of thermoplastic special-shaped pipes with different structures.
In the embodiment of the present invention, as shown in fig. 1, the forming device of the thermoplastic profile pipe comprises the extrusion adjusting device 4. In the invention, the extrusion adjusting device 4 is arranged at the end of the I-shaped part in the T shape, is connected with the forming block 3 and controls the sliding of the forming block 3. The invention has no special limitation on the connection mode of the extrusion adjusting device 4 and the forming block 3, and can ensure that the extrusion adjusting device 4 can be used for accurately controlling the sliding distance of the forming block 3. In the present invention, the connection mode of the extrusion adjusting device 4 and the forming block 3 is preferably a rolling ball connection.
As shown in FIG. 1, in one embodiment of the present invention, the extrusion adjusting device 4 has graduation lines, and the radian of each advance graduation line corresponding to the bending shape of the pipe to be bent is increased by 0.5-1.5 rad. In the invention, a thermoplastic pipe to be bent is fixed by a molding device of a thermoplastic special-shaped pipe and then heated, then scale marks on an extrusion adjusting device 4 are adjusted, and each time one scale mark is pushed towards the minus end of a support base plate 1, a molding block can be pushed to slide towards the minus end of the support base plate 1 so as to extrude the pipe to be bent, so that the radian of the bending shape of the pipe to be bent is increased by 0.5-1.5 rad, and finally, the accurate bending of the thermoplastic pipe to be bent is realized by accurately controlling the sliding distance of the molding block 3.
In the invention, the material of the forming device of the thermoplastic special-shaped pipe comprises one or more of iron, stainless steel and carbon steel. The invention limits the composition materials of the forming device of the thermoplastic special-shaped pipe in the range, is beneficial to improving the high temperature resistance and the mechanical property of the forming device, and is further beneficial to the forming device to be suitable for special-shaped forming of high-performance thermoplastic pipes with high mechanical property.
The forming device for the thermoplastic special-shaped pipe provided by the invention can realize accurate control of the bending radian, can realize on-site rapid forming according to the requirements of thermoplastic special-shaped pipes with different structures, avoids the problems of wrinkling, sinking, breaking, out of round and springback after shaping, has high forming efficiency and low cost, and can realize on-site forming and assembly.
The invention also provides a molding method of the thermoplastic special-shaped pipe, which comprises the following steps:
(1) placing a metal spring as an internal supporting material in the thermoplastic pipe to obtain the thermoplastic pipe to be bent;
(2) assembling the thermoplastic pipe to be bent in the step (1) into the forming device in the technical scheme, heating to a deformation temperature, and bending to obtain a deformed thermoplastic pipe;
(3) and (3) cooling the deformed thermoplastic pipe in the step (2), disassembling the forming device, and extracting the internal support material to obtain the thermoplastic special-shaped pipe.
According to the invention, the metal spring is used as an internal supporting material and is placed inside the thermoplastic pipe to obtain the thermoplastic pipe to be bent. In the present invention, the metal spring preferably includes one of a carbon steel spring, an alloy steel spring, a copper alloy spring, and a nickel alloy spring. The invention limits the types of the metal springs within the range, is favorable for ensuring the high temperature resistance and the mechanical property of the metal springs, is favorable for better supporting under heating conditions, and is suitable for being used as an internal supporting material of a high-performance thermoplastic pipe with high mechanical property. The source of the metal spring is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
In the invention, the pitch of the metal spring is preferably 0.5-2 mm, and more preferably 1 mm; the diameter of the spring wire of the metal spring is preferably 0.5-2 mm, and more preferably 1 mm. The invention limits the pitch of the metal spring and the diameter of the spring wire in the range, is beneficial to improving the elasticity of the metal spring, thereby being beneficial to better supporting under heating condition and being suitable for being used as an internal supporting material of a high-performance thermoplastic pipe with high mechanical property. The outer diameter of the metal spring is not specially limited, the outer diameter of the metal spring can be ensured to be smaller than the inner diameter of the thermoplastic pipe to be bent, and the metal spring can play an effective supporting role in the bending process after being placed inside the thermoplastic pipe.
The thermoplastic pipe material is not particularly limited in the present invention, and any thermoplastic pipe material known to those skilled in the art may be used. In the present invention, the thermoplastic pipe is preferably a crystalline high performance thermoplastic or an amorphous high performance thermoplastic; the crystallization type high-performance thermoplastic material is preferably polyether-ether-ketone, polyaryletherketone, polyether ketone or polyphenylene sulfide; the amorphous high performance thermoplastic is preferably polyetherimide or polyphenylene sulfone. The source of the thermoplastic pipe material is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
In the invention, the clearance between the metal spring and the thermoplastic pipe is preferably 0.05-1 mm, and more preferably 0.1-0.8 mm. The invention limits the clearance between the metal spring and the thermoplastic pipe within the range, avoids the phenomenon that the clearance is too low to lead the spring to be difficult to take out, and simultaneously avoids the phenomenon that the clearance is too high to play an effective supporting role, thereby avoiding the phenomena of fold, dent, break and out of round in the process of forming the special-shaped pipe, and being beneficial to ensuring that the integral structural performance of the pipe is not lost.
After the thermoplastic pipe to be bent is obtained, the thermoplastic pipe to be bent is assembled into the forming device in the technical scheme, and is heated to the deformation temperature for bending, so that the deformed thermoplastic pipe is obtained. The invention has no special limitation on the assembling operation, and can realize the purpose of fixing the thermoplastic pipe to be bent by utilizing the arc-shaped groove of the limiting block and the arc-shaped groove of the forming block.
The heating device is not specially limited, and the thermoplastic pipe to be bent can be heated. In the present invention, the heating is preferably a temperature programmed; the temperature programming rate is preferably 5-30 ℃/min, and more preferably 10-20 ℃/min. The invention limits the heating mode and the programmed heating rate in the range, is beneficial to simultaneously heating the forming device and the thermoplastic pipe to be bent to the deformation temperature, avoids uneven local heating of the pipe, prevents the pipe from wrinkling, sinking, breaking and out of round in the subsequent bending process, is beneficial to the field operation of bending and shaping, and also avoids the condition that the performance of the material is reduced due to repeated heating of the whole pipe.
In the invention, the deformation temperature is preferably 150-330 ℃, and more preferably 200-300 ℃. The invention limits the deformation temperature in the range, is beneficial to realizing bending forming and simultaneously avoids the condition of performance reduction of the pipe material caused by overhigh deformation temperature. In the embodiment of the invention, the deformation temperature is adjusted and selected within the range according to the performance of the pipe, and the deformation temperature is 50-100 ℃ higher than the glass transition temperature of the thermoplastic pipe to be bent.
The invention preferably preserves heat after heating to the deformation temperature; the heat preservation time is preferably 5-15 min, and more preferably 10 min. The invention limits the heat preservation time within the range, which is beneficial to keeping the temperature of the forming device and the thermoplastic pipe to be bent within the deformation temperature range.
In the invention, the bending is preferably a scale for adjusting the scale mark on the feeding extrusion adjusting device 4 every 3-10 min; the time interval is more preferably every 5-8 min. The interval time of the scale is limited in the range, so that the special-shaped pipe is favorable for slow forming, and the phenomena of folds, depressions, breakage and out-of-round in the forming process of the special-shaped pipe are avoided, so that the integral structural performance of the pipe is favorably ensured not to be lost.
After the deformed thermoplastic pipe is obtained, the deformed thermoplastic pipe is cooled, the forming device is disassembled, and the internal supporting material is drawn out, so that the thermoplastic special-shaped pipe is obtained.
In the present invention, when the thermoplastic pipe is a crystalline high-performance thermoplastic material, the cooling method is preferably: cooling to the glass transition temperature of the crystalline high-performance thermoplastic material at the speed of 3-8 ℃/min; the rate of cooling is more preferably 5 ℃/min. In the present invention, when the thermoplastic pipe is a crystalline high performance thermoplastic material, the cooling process involves a process of rearrangement of crystalline segments in the material. The invention limits the cooling rate of the crystalline high-performance thermoplastic material within the range, is beneficial to obtaining the crystalline high-performance thermoplastic special-shaped pipe material with higher strength, avoids overlong forming time due to overlow cooling rate, and simultaneously avoids the situation that the cooling rate is overhigh and is not beneficial to forming favorable rearrangement of crystalline chain segments, thereby preventing the reduction of the mechanical strength of the obtained crystalline high-performance thermoplastic special-shaped pipe material and avoiding the problem of springback after forming. The invention limits the cooling temperature to the glass transition temperature of the crystalline high-performance thermoplastic material, and avoids the stress release of the obtained crystalline high-performance thermoplastic special-shaped pipe in the use process, thereby preventing the pipe from generating certain deformation or reducing the mechanical strength.
In the present invention, when the thermoplastic pipe is an amorphous high-performance thermoplastic material, the cooling method is preferably: cooling to room temperature at the speed of 10-55 ℃/min; the cooling rate is more preferably 40-50 ℃/min. The invention limits the cooling rate of the amorphous high-performance thermoplastic material within the range, is favorable for rapid cooling forming, and avoids the problem of rebound after forming.
The invention has no special limitation on the mode of disassembling the forming device, and can realize the purpose of disassembling. In the present invention, the manner of withdrawing the internal support material is preferably rotary withdrawal.
The invention provides a method for forming a thermoplastic special-shaped pipe, which utilizes a metal spring as an internal supporting material (namely a piercing) of the thermoplastic pipe, assembles the thermoplastic pipe on a forming device of the thermoplastic special-shaped pipe, then heats the thermoplastic pipe and the forming device at the same time, and then utilizes the forming device to control the bending angle of the thermoplastic pipe, thereby effectively reducing the bending deformation, the fold, the dent, the break, the out of round of the pipe wall and the stress accumulation after bending while realizing the accurate control of the bending radian, and the forming method provided by the application can avoid the loss of the integral structural performance of the thermoplastic pipe, has simple forming method, can be quickly formed on site according to the requirements of the thermoplastic special-shaped pipes with different structures, has high forming efficiency and low cost, realizes the purposes of on-site forming and assembling, and adopts the metal spring with high temperature resistance, the supporting function can be still achieved in the heating and bending process, the core is easy to loose, and the problems of environmental pollution and complex process caused in the post-treatment of the traditional water-soluble core are solved.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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