CN109366957A - The hot bending shape device and hot bending shape process of thermoplastic pipes - Google Patents
The hot bending shape device and hot bending shape process of thermoplastic pipes Download PDFInfo
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- CN109366957A CN109366957A CN201811390204.5A CN201811390204A CN109366957A CN 109366957 A CN109366957 A CN 109366957A CN 201811390204 A CN201811390204 A CN 201811390204A CN 109366957 A CN109366957 A CN 109366957A
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- hot bending
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/08—Bending or folding of tubes or other profiled members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/80—Component parts, details or accessories; Auxiliary operations
- B29C53/84—Heating or cooling
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- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
The present invention relates to a kind of hot bending shape devices of thermoplastic pipes, including support baseboard, locating piece, punching flexible axle, straightway limited block and forming blocks, both ends on the support baseboard and along its length are respectively equipped with locating piece, multiple forming blocks arranged apart are equipped between two locating pieces, the forming tank that thermoplastic pipes are used to hot bending shape is constituted between adjacent forming blocks, the two sides or in which side of the forming blocks are equipped with multiple straightway limited blocks arranged apart, and straightway limited block is detachably connected with support baseboard, the linearity limited block has linear groove, the punching flexible axle sequentially passes through the linear groove and forming tank of corresponding straightway limited block, the hot bending shape process of thermoplastic pipes, its specific steps is successively: blank clamping → be placed in baking oven heating → heat preservation → cooling → core pulling → heat Water immersion → cooling.Not only simple process, production cost are low by the present invention, but also are not easy to spring back and can produce in batches.
Description
Technical field
Present invention relates particularly to a kind of hot bending shape device of thermoplastic pipes and hot bending shape processes.
Background technique
Thermoplastic pipes are the problem of its current industrial application by certain demand structure bend fixing, difficult point enumerate as
Under:
1) bending position is easily recessed, fractures, seriously losing circle.
2) it is easily sprung back after hot bending sizing, especially when working temperature is higher, easily occurs substantially springing back, influence tube fluid stream
Dynamic property and decorative appearance.
3) hot bending radius is smaller, and wall thickness is thinner, and shape is more complicated and hot bending passage is more, difficult point 1 among the above), 2) it is existing
As being more easy to happen.
4) straightway thermoplastic pipe such as is easily distorted, folds, wrinkling at the straight phenomenon of mistakes when hot bending.
5) hot bending temperature, soaking time, the type of cooling difference and the diversity under different condition of different materials need
It asks, under the factor of several variables, hot bending certain shapes, the formed pipe complex process of size, yield rate is low, low efficiency.
The thermoplasticity sizing bend pipe produced in prior art at present, mostly with three linkage positioning devices, fixation is pre-bent to respectively
The both ends and flexural center of type pipe cool down after then carrying out primary heating sizing to it, trim, clean after cooling, i.e.,
Complete the production of target thermoplastic sizing bend pipe.The disadvantages of this method are: 1) mostly based on single-piece production, low efficiency is occupied
Space is big, needs to put into a large amount of molding machine when batch production；2) due to only passing through primary heating cooling procedure, this method
The thermoplasticity calibration tube of production, with residual stress quick release, is easy rebound when certain working temperature is higher.
Summary of the invention
The object of the present invention is to provide one kind, not only simple process, production cost are low, but also are not easy to spring back and can criticize
Measure the hot bending shape device and hot bending shape process of the thermoplastic pipes of production.
In order to achieve the above object, first technical solution of the invention is: a kind of hot bending shape of thermoplastic pipes
Device, including support baseboard, locating piece, punching flexible axle, straightway limited block and forming blocks, on the support baseboard and along its length
The both ends in degree direction are respectively equipped with locating piece, are equipped with multiple forming blocks arranged apart, adjacent molding between two locating pieces
The forming tank that thermoplastic pipes are used to hot bending shape is constituted between block, the two sides or in which side of the forming blocks are equipped with multiple
Straightway limited block arranged apart, and straightway limited block is detachably connected with support baseboard, the linearity limited block tool
Linear slot, the punching flexible axle sequentially pass through the linear groove and forming tank of corresponding straightway limited block.
In above-mentioned first technical solution, the top end surface of each forming blocks is equipped with graduation mark.
In above-mentioned first technical solution, the side of the forming blocks is arc convex, and the other side is arc-shaped concave, phase
The arc-shaped concave of previous forming blocks in two adjacent forming blocks and the arc convex of the latter forming blocks constitute forming tank.
In above-mentioned first technical solution, the radian of the forming tank is 30 °~150 °.
In order to achieve the above object, second technical solution of the invention is: a kind of hot bending shape of thermoplastic pipes
Process comprises the concrete steps that:
Step a, by preforming blank clamping in the forming tank of hot bending shape device on, and blank is sleeved on hot bending
On the punching flexible axle that molding machine is equipped with, blank is integrally placed in baking oven together with hot bending shape device then and is heated, heating one
The section time is kept the temperature again, finally will integrally be taken out out of baking oven；
Step b, cooling to staged is synchronized through step a treated blank and together with hot bending shape device；
Step c, out of blank pipe extract out punching flexible axle, and blank still keep clamping state, then by blank together with
Hot bending shape device, which is put into the hot water of certain temperature, to be soaked for a period of time, and is cooled down again after taking-up, finally from hot bending at
Blank is taken out in the forming tank of type device, hot bending shape process is completed in blank at this time.
In above-mentioned second technical solution, the heating and temperature control in the step a in baking oven is at 150 DEG C~250 DEG C
In range, heating time is controlled within the scope of 5 minutes~30 minutes；Holding temperature in the baking oven is controlled 150 DEG C~250
Within the scope of DEG C, soaking time is controlled within the scope of 5 minutes~30 minutes.
In above-mentioned second technical solution, blank is put cold in air together with even hot bending shape device in the step b
But it 1 minute~5 minutes, then places it in again 1 minute~10 minutes cooling in the cold water that temperature is 15 DEG C~25 DEG C.
In above-mentioned second technical solution, after implementing air cooling to blank in the step b, pass through infrared radiation thermometer
Device and Preform surface temperature are measured lower than 30 DEG C~100 DEG C of holding temperature, it is cooling then to carry out cold water again.
In above-mentioned second technical solution, the temperature of hot water is higher than 20 DEG C of blank actual work temperature in the step c
~50 DEG C, soaking time controls within the scope of 5 minutes~15 minutes, after blank reaches water temperature together with hot bending shape device and protects
It takes out within temperature 5 minutes~15 minutes, then carries out water cooling using the water that temperature is 15 DEG C~25 DEG C again, cooling time, control existed
Within the scope of 1 minute~10 minutes.
In above-mentioned second technical solution, if blank is that rebound or deformed work occur under certain working condition
Part is additionally provided with preheating process before implementation steps a, and the detailed process of the preheating process is: at workpiece bows center
Position makes a mark line, then places it in the baking oven that temperature is 80 DEG C~200 DEG C and heats 5 minutes~30 minutes, then exists
Oven temperature is to keep the temperature 5 minutes~30 minutes at 80 DEG C~200 DEG C.
Good effect possessed by the present invention is: after the hot bending shape device of thermoplastic pipes of the invention, by
In the present invention include support baseboard, locating piece, punching flexible axle, straightway limited block and forming blocks, on the support baseboard and edge
The both ends of its length direction are respectively equipped with locating piece, and multiple forming blocks arranged apart are equipped between two locating pieces, adjacent
The forming tank that thermoplastic pipes are used to hot bending shape is constituted between forming blocks, the two sides or in which side of the forming blocks are equipped with
Multiple straightway limited blocks arranged apart, and straightway limited block is detachably connected with support baseboard, the linearity limit
Block has linear groove, and the punching flexible axle sequentially passes through the linear groove and forming tank of corresponding straightway limited block；In use, will
Thermoplastic pipes are sleeved on the periphery of punching flexible axle, and be installed on linearity limited block linear groove and adjacent molding
In forming tank between block, the present invention adjusts forming tank according to the diameter, bending angle and bending radius of thermoplastic pipes
Parameter, hot bending shape device of the invention is not only simple in structure, and easy to use, is suitable for different-diameter, differently curved
Angle, differently curved radius thermoplastic pipes hot bending shape；The hot bending shape technique of thermoplastic pipes of the invention
Method, specific steps are successively: blank clamping → be placed in baking oven heating → heat preservation → cooling → core pulling → hot-water soak → cold
But, hot bending shape process of the present invention, it is cooling using method of stepped sectional after after baking oven heating and thermal insulation for the first time,
Blank is set to be changed into non-fully soft state from complete soft state, blank, without elasticity, does not have under complete soft state
The ability for keeping any shape easily makes its corrugation using direct cooling, loses and justify, when blank is changed into non-fully soft state,
Blank has certain elastic resilience, and hardness increases, and the shape state that holds its shape after method of stepped sectional of the present invention is cooling is good
It is good, and the blank under clamping state, in bending segmental arc, there are a large amount of residual stress, when blank is in the freedom of certain operating condition
When under state, gradually or quick release, to the opposite direction for overcoming former yield stress, deformation occurs for stress, that is, springs back.Of the invention
Hot bending shape process makes blank after forming for the first time, and removing punching flexible axle makes it be higher than actual condition temperature, and in base
It at certain temperature of heating and is kept the temperature for a period of time under material clamping state, makes its residual stress targeted release, remnants under the process
Stress release maintains original shape, and since reheating temperature is higher than actual condition temperature, remnants are answered under secondary holding temperature
After power discharges completely, the temperature of actual condition is lower than secondary destressing and setting temperature, therefore in the at a temperature of blank of actual condition
Biggish deformation no longer occurs.The process production thermoplasticity sizing bend pipe practical hot bending shape angular error be ±
2°.The hot bending shape process of thermoplastic pipes of the present invention based on hot bending shape device, overcomes existing skill
The problem be recessed when thermoplastic pipes hot bending in art, fracture, losing circle, scratch, guarantee after sizing under specified operating condition without rebound,
It distorts, lose straight phenomenon generation, long-time service is in good condition, does not influence to manage interior design discharge and decorative appearance in product.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the hot bending shape device of thermoplastic pipes of the invention；
Fig. 2 is the schematic perspective view of linearity limited block in Fig. 1；
Fig. 3 is the schematic perspective view of support baseboard and locating piece and forming blocks assembly in Fig. 1；
Fig. 4 is the structural schematic diagram of the thermoplastic pipes of Example 1 and Example 2 of the present invention；
Fig. 5 is the schematic side view of Fig. 4；
Fig. 6 is the preforming blank schematic diagram of Fig. 4；
Fig. 7 is the length expanded schematic diagram of Fig. 4.
Specific embodiment
Below in conjunction with attached drawing and the embodiment provided, the present invention is further illustrated, and however, it is not limited to this.
As shown in Figure 1, 2, 3, the hot bending shape device of a kind of thermoplastic pipes, including support baseboard 1, locating piece 2, wear
Core flexible axle 3, straightway limited block 4 and forming blocks 5, on the support baseboard 1 and both ends along its length are respectively equipped with fixed
Position block 2 is equipped with multiple forming blocks 5 arranged apart between two locating pieces 2, thermoplasticity modeling is constituted between adjacent forming blocks 5
Expects pipe is used to the forming tank 51 of hot bending shape, and the two sides or in which side of the forming blocks 5 are equipped with multiple straight lines arranged apart
Section limited block 4, and straightway limited block 4 is detachably connected with support baseboard 1, the linearity limited block 4 has linear groove 41,
The punching flexible axle 3 sequentially passes through the linear groove 41 and forming tank 51 of corresponding straightway limited block 4.
As shown in Figure 1, in use, blank is packed into pre-bending fixed slot, the top end surface of each forming blocks 5 is equipped with
Graduation mark, it is ensured that flexural center mark line is aligned with the center of the graduation mark in forming tank, guarantees pre-bending calibration tube in bending
The length of heart two sides is controllable.
As shown in figure 3, in order to enable structure of the invention is more reasonable, in order to adjust applicable different size blank hot bending at
The side of the matched forming blocks of type institute, the forming blocks 5 is arc convex, and the other side is arc-shaped concave, two adjacent moldings
The arc-shaped concave of previous forming blocks in block 5 and the arc convex of the latter forming blocks constitute forming tank 51.
The radian of forming tank 51 of the present invention is 30 °~150 °.The arc length of the forming tank 51 is by bending radius and curved
Bent angle codetermines, if bending radius is R, the arc length of forming tank 51 is R/6 mm~5R/6mm.
The bottom of forming blocks 5 and straightway limited block 4 of the invention is equipped with multiple screw holes, and by sunk screw with
1 tightening of support baseboard is integrated.
Thermoplastic pipes in use, is sleeved on the periphery of punching flexible axle, and block by hot bending shape device of the invention
In the linear groove of linearity limited block and forming tank, the clamping and subsequent hot bending convenient to carry out to blank are completed
Molding procedure.Hot bending shape device of the invention is not only simple in structure, and easy to use, and it is curved to be suitable for different-diameter, difference
Bent angle, differently curved radius thermoplastic pipes hot bending shape.
The advantage of hot bending shape device of the invention is:
1) main body guarantees dress using rapid thermal conduction material, such as aluminium alloy 3A21, aluminium alloy 5052, copper plate T2 etc.
Setting can be rapidly achieved suitable with baking oven baking temperature, be heated evenly pre- bend pipe integrally, avoid and cause because of uneven heating
Corrugation, expand different phenomenon.
2) can pre-bending be formed the thermoplasticity calibration tube of differently curved angle.The thermoplastic pipe of pre-bending specified angle, selection with
The forming tank that its pre-bending sizing angle matches, pre-bending angle are calculated as θ, the suitable θ range of the hot bending shape device: 30 °≤θ≤
150°；Certain moulding springback capacity is had after thermoplastic pipes hot bending shape, spring back angle is calculated as By pre-bending material, in advance
Bending angle, pre-bending radius and hot bending temperature codetermine, and the hot bending shape moulding of the producible thermoplastic pipes of this method is returned
Play angle range easy to control are as follows:ε is calculated as with the angle of the matched molding groove center line of target pre-bending calibration tube, three
The design relation of person are as follows:
3) can pre-bending be formed the thermoplasticity calibration tube of differently curved radius.The thermoplastic pipe of pre-bending specified radius, selection with
The forming tank that matches of its pre-bending sizing radius, can pre-bending sizing target flexural radius formed pipe.
4) it can control the straightness of target calibration tube straightway.The soft easy forming of punching flexible axle matter, penetrates in pre-bending target tube
After can lose straight, its trend is fixed using the linear groove of straightway limited block, linear groove diameter is calculated as D, and pre-bending pipe outside diameter is calculated as d,
Its relation constraint are as follows: d=D- (0.5-1) mm.The connection of straightway limited block 4 and support baseboard 1 of the invention only needs to fasten
One sunk screw fastens after angle adjustment on demand, realizes pre-bending formed pipe straightway and bending circular arc both ends
Angle adjustment, different springback capacities when compensating different materials or specification thermoplasticity bend pipe thermoforming；It can also make simultaneously
Other screw threads with former fixed bit horizontalization line direction can be used when having threaded hole sliding teeth or destroying for the use of spare threaded hole
Hole substitution.
5) can pre-bending different-diameter thermoplastic pipe.According to the diameter of pre-bending thermoplastic pipes, select to match is worn
Core flexible axle, tube seat.This method is suitable for hot bending diameter: φ 5mm≤d≤φ 50mm.
6) punching flexible axle is repeatable recycles.It is molten that the punching flexible axle fusing point of use is higher than target pre-bending sizing tube material
Point, matter is soft flexible, does not scratch pre- elbow internal wall, and punching flexible axle diameter=pre-bending bore-(0.5-1) mm is repeatable to make
With, it needs to align at a certain temperature after being used for multiple times, it will be using making again after either physically or chemically cleaning after surface is contaminated
With.
7) pre-bending formed pipe inside/outside tube wall is not scratched.Limiting slot whole corner angle round corner treatment prevents plowing from pre-bending molding
Pipe surfaces externally and internally.
A kind of hot bending shape process of thermoplastic pipes, comprises the concrete steps that:
Step a, by preforming blank clamping in the forming tank of hot bending shape device on, and blank is sleeved on hot bending
On the punching flexible axle that molding machine is equipped with, blank is integrally placed in baking oven together with hot bending shape device then and is heated, heating one
The section time is kept the temperature again, finally will integrally be taken out out of baking oven；
Wherein, the heating and temperature control in the step a in baking oven is within the scope of 150 DEG C~250 DEG C, heating time control
Within the scope of 5 minutes~30 minutes；Holding temperature in the baking oven controls the soaking time control within the scope of 150 DEG C~250 DEG C
System is within the scope of 5 minutes~30 minutes；
Step b, cooling to staged is synchronized through step a treated blank and together with hot bending shape device；
Blank is put together with even hot bending shape device and is cooled down 1 minute~5 minutes in air in the step b, by infrared
Temperature measurer measures device and Preform surface temperature lower than 30 DEG C~100 DEG C of holding temperature, and then placing it in temperature again is 15 DEG C
It is 1 minute~10 minutes cooling in~25 DEG C of cold water.
Step c, out of blank pipe extract out punching flexible axle, and blank still keep clamping state, then by blank together with
Hot bending shape device, which is put into hot water of the temperature higher than 20 DEG C~50 DEG C of blank actual work temperature, to be impregnated 5 minutes~15 minutes,
Water cooling is carried out using the water that temperature is 15 DEG C~25 DEG C again after taking-up, is controlled in 1 minute~10 minutes ranges cooling time
It is interior, blank is finally taken out out of hot bending shape device forming tank, hot bending shape process is completed in blank at this time.
If blank is that rebound or deformed workpiece occur under certain working condition, it is additionally provided with before implementation steps a
The detailed process of preheating process, the preheating process is: making a mark line in workpiece bows center, is then set
It is heated in the baking oven that temperature is 80 DEG C~200 DEG C 5 minutes~30 minutes, then in the case where oven temperature is 80 DEG C~200 DEG C
Heat preservation 5 minutes~30 minutes.
Embodiment 1
A kind of manufacturing technique method and benefit of minor diameter FEP sizing bend pipe.
Design requirement: as shown in Figure 4,5, productive target be formed FEP pipe diameter be φ, wall thickness t, pre-bending be formed radius
It is respectively a, b for R, pre-bending angle θ, both ends length of straigh line.Note: following φ-t refers to that diameter is φ, wall thickness t, and unit is
The thermoplastic pipes of mm.
Specific production process:
Productive target sizing FEP blank size determines: as shown in Figure 6,7, by each size of design requirement target calibration tube
Expansion, and certain surplus c is reserved both ends are each；(note: ignoring the increment of target formed pipe length direction during thermoforming), base
Expects pipe length is L=(a+b+k+2c) mm, and the line that makes marks at the k/2 of flexural center.
The design of hot bending shape device parameter: 1 size of support baseboard is according to arrangement of the pre-formed pipe on drawing and baking oven
The volume and area that can be accommodated determine, guarantee that pre-formed pipe is all supported by base plate plane；The bend pipe of forming tank is fixed
Type groove center line angle is designed as
Punching flexible axle: using the solid PTFE mandrel of diameter [φ-t- (0.5)] mm, guarantees that both ends length is respectively greater than target
Pre-bending sizing blank pipe 100mm, i.e. length are [a+b+k+2c+ (100-150)] mm.It, can when repeatedly using contaminated jaundice
Using mild acid wash.
Clamping process: the matched forming tank of bend pipe that will be formed with target requirement φ-t FEP is fixed on by sunk screw
In the support plate 1 matched, is managed, be packed into pre-bending forming tank across pre-bending FEP with the soft stick of solid PTFE, and ensure that flexural center marks
Line is aligned with the centre mark line of forming tank, then the straightway limited block of forming blocks two sides is separately fixed on support baseboard 1,
Complete the pre-bending sizing clamping of thermoplastic pipes.
Hot bending shape process flow: pre-bending calibration tube and device that clamping is completed are placed in together in baking oven and heat 220 DEG C
~240 DEG C, keep the temperature -25 minutes 20 minutes；It is cooled down 5 minutes in air after taking-up, device and base is measured by infrared radiation thermometer
When expecting that surface temperature is 160 DEG C~180 DEG C, then be dipped in cold water and be cooled to 10 DEG C~25 DEG C；Punching flexible axle is extracted out, by target
Formed pipe, which is dipped in together in 90 DEG C -100 DEG C of boiling water with device, to be impregnated 8 minutes, then is dipped in cold rinse bank and is cooled to room temperature, and is removed
Straightway limited block takes out target formed pipe out of forming tank, finally cleans, trims, packaging, completes sizing bend pipe production.
The angular distribution of practical formed pipe is in θ ± 2 °, molding FEP bend pipe work in 70 DEG C and circulating water temperature below
Make, rebound, deformation will not occur.It is formed using the FEP of this method production φ 12-1mm, 90 ° of hot bending angle, hot bending radius R60
Bend pipe, with the technique cost-saved 70% for using single-piece production currently on the market.
Embodiment 2
A kind of hot bending shape process of the PVC transparent plastic tube of outer diameter φ 10mm, wall thickness 1mm.
Design requirement: as shown in Figure 4,5, productive target be formed FEP pipe diameter be φ, wall thickness t, pre-bending be formed radius
It is respectively a, b for R, pre-bending angle θ, both ends length of straigh line.Note: following φ-t refers to that diameter is φ, wall thickness t, and unit is
The thermoplastic pipes of mm.
Specific production process:
Productive target sizing pvc pipe billet size determines: as shown in Figure 6,7, by each size of design requirement target calibration tube
Expansion, and certain surplus c is reserved both ends are each；(note: ignoring the increment of target formed pipe length direction during thermoforming), base
Expects pipe length is L=(a+b+k+2c) mm, and the line that makes marks at the k/2 of flexural center.
The design of hot bending shape device parameter: 1 size of support baseboard is according to arrangement of the pre-formed pipe on drawing and baking oven
The volume and area that can be accommodated determine, guarantee that pre-formed pipe is all supported by base plate plane；The bend pipe of forming tank is fixed
Type groove center line angle is designed as
Punching flexible axle: using the solid PTFE mandrel of diameter [φ-t- (0.5)] mm, guarantees that both ends length is respectively greater than target
Pre-bending sizing blank pipe 100mm, i.e. length are [a+b+k+2c+ (100-150)] mm.It, can when repeatedly using contaminated jaundice
Using mild acid wash.
Clamping process: the matched forming tank of bend pipe that will be formed with target requirement φ-t FEP is fixed on by sunk screw
In the support plate 1 matched, is managed, be packed into pre-bending forming tank across pre-bending FEP with the soft stick of solid PTFE, and ensure that flexural center marks
Line is aligned with the centre mark line of forming tank, then the straightway limited block of forming blocks two sides is separately fixed on support baseboard 1,
Complete the pre-bending sizing clamping of thermoplastic pipes.
Hot bending shape process flow: pre-bending calibration tube and device that clamping is completed are placed in together in baking oven and heat 150 DEG C
~160 DEG C, keep the temperature -15 minutes 10 minutes；It is cooled down 2 minutes in air after taking-up, device and base is measured by infrared radiation thermometer
When expecting that surface temperature is 80 DEG C~90 DEG C, then it is dipped in cold water and is cooled to 10 DEG C~25 DEG C；Extract out punching flexible axle, by target at
Type pipe, which is dipped in together in 70 DEG C -80 DEG C of hot water with device, to be impregnated 10 minutes, then is dipped in cold rinse bank and is cooled to room temperature, and is removed straight
Line segment limited block takes out target formed pipe out of forming tank, finally cleans, trims, packaging, completes sizing bend pipe production.
The angular distribution of practical formed pipe is in θ ± 2 °, molding PVC bend pipe work in 50 DEG C and circulating water temperature below
Make, rebound, deformation will not occur.
Example 3: it has sprung back the counter of φ-t FEP pipe and has arranged reheating roll forming process flow
Note: the anti-FEP pipe arranged allows to lose straight, rebound, slight depression phenomenon；But it is not allow for fractureing.
The FEP marked is managed in process flow: rebound FEP plastic tube → marking at raw water tubes fillet center →
It is placed in 150 DEG C~160 DEG C of baking oven and keeps the temperature 4~5 minutes, taken out after causing it uniformly to spring back.Again again by 1 the method for example
Hot bending sizing.
Hot bending shape process of the present invention, after after baking oven heating and thermal insulation for the first time, using method of stepped sectional
Cooling, the air first through a period of time is cooling, so that blank is changed into non-fully soft state from complete soft state, blank exists
Without elasticity under complete soft state, do not have the ability for keeping any shape, its corrugation is but easily made using direct water-cooling, is lost
Circle, when blank is changed into non-fully soft state, blank has certain elastic resilience, and hardness increases, and adopts at this time
The shape that holds its shape after being water-cooled is in good condition.Under clamping state and using the blank of the chilling type of cooling, in bending segmental arc
There are a large amount of residual stress, when under the free state that blank is in certain operating condition, stress gradually or quick release, to overcoming
Deformation occurs for the opposite direction of former yield stress, that is, springs back.Hot bending shape process of the invention makes blank after forming for the first time,
Remove punching flexible axle make its be higher than 20 DEG C~50 DEG C of actual condition, and under blank clamping state at certain temperature of heating simultaneously
Held for some time makes its residual stress targeted release, and residual stress release maintains original shape under the process, is added due to secondary
Hot temperature is higher than 20 DEG C~50 DEG C of actual condition temperature, after residual stress discharges completely under secondary holding temperature, actual condition
Temperature be lower than secondary destressing and setting temperature, therefore biggish deformation no longer occurs in the at a temperature of blank of actual condition.It should
The practical hot bending shape angular error of the thermoplasticity sizing bend pipe of process production is ± 2 °.
The hot bending shape production method benefit of thermoplastic pipes:
1) bend fixing of thermoplastic pipes can be produced.The technological process of production is pre-bending shaping blank clamping → be placed in baking
Case heating → heat preservation → air cooling → cold water cooling → core pulling → boiling water immersion → cold water cooling → cleaning → trimming → packaging.
2) can be used for having sprung back or the curved sizing of reheating of strained thermoplasticity thin-wall tube, i.e., it is counter to arrange.The technological process of production
Are as follows: it is pre- counter to arrange thermoplasticity calibration tube flexural center to mark → be placed in baking oven to be heated to springing back → pre- anti-calibration tube clamping of arranging completely
→ it is placed in baking oven heating → heat preservation → air cooling → cold water cooling → core pulling → boiling water immersion → cold water cooling → cleaning → packet
Dress.
3) be formed bend pipe by the thermoplasticity that this method produces, no recess, corrugationless, without lose circle, without losing straight phenomenon, and
Without rebound, without deformation under the fluid circulation operating condition of certain temperature.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of hot bending shape device of thermoplastic pipes, it is characterised in that: including support baseboard (1), locating piece (2), wear
Core flexible axle (3), straightway limited block (4) and forming blocks (5), both ends point on the support baseboard (1) and along its length
Not She You locating piece (2), multiple forming blocks (5) arranged apart, adjacent forming blocks (5) are equipped between two locating pieces (2)
Between constitute thermoplastic pipes be used to hot bending shape forming tank (51), the two sides or in which side of the forming blocks (5) are set
There are multiple straightway limited blocks (4) arranged apart, and straightway limited block (4) is detachably connected with support baseboard (1), it is described
Linearity limited block (4) has linear groove (41), and the punching flexible axle (3) sequentially passes through corresponding straightway limited block (4)
Linear groove (41) and forming tank (51).
2. the hot bending shape device of thermoplastic pipes according to claim 1, it is characterised in that: each forming blocks
(5) top end surface is equipped with graduation mark.
3. the hot bending shape device of thermoplastic pipes according to claim 1, it is characterised in that: the forming blocks (5)
Side be arc convex, the other side is arc-shaped concave, and the arc of the previous forming blocks in two adjacent forming blocks (5) is recessed
The arc convex of face and the latter forming blocks constitutes forming tank (51).
4. the hot bending shape device of thermoplastic pipes according to claim 1 or 3, it is characterised in that: the forming tank
(51) radian is 30 ° ~ 150 °.
5. a kind of hot bending shape process of thermoplastic pipes, it is characterised in that: it is comprised the concrete steps that:
Step a, by preforming blank clamping in the forming tank of hot bending shape device on, and blank is sleeved on hot bending shape
On the punching flexible axle that device is equipped with, blank is integrally placed in baking oven together with hot bending shape device then and is heated, when heating one section
Between kept the temperature again, finally will integrally be taken out out of baking oven；
Step b, cooling to staged is synchronized through step a treated blank and together with hot bending shape device；
Step c, punching flexible axle is extracted out out of blank pipe, and blank still keeps clamping state, then by blank together with hot bending
Molding machine is put into the hot water of certain temperature and is soaked for a period of time, and is cooled down again after taking-up, finally fills from hot bending shape
Blank is taken out in the forming tank set, hot bending shape process is completed in blank at this time.
6. the hot bending shape process of thermoplastic pipes according to claim 5, it is characterised in that: the step a
Within the scope of 150 DEG C ~ 250 DEG C, heating time controls within the scope of 5 minutes ~ 30 minutes heating and temperature control in middle baking oven；Institute
The holding temperature stated in baking oven controls within the scope of 150 DEG C ~ 250 DEG C, and soaking time controls within the scope of 5 minutes ~ 30 minutes.
7. the hot bending shape process of thermoplastic pipes according to claim 5, it is characterised in that: the step b
Middle blank is put together with even hot bending shape device and is cooled down 1 minute ~ 5 minutes in air, and then placing it in temperature again is 15 DEG C ~ 25
DEG C cold water in cooling 1 minute ~ 10 minutes.
8. the hot bending shape process of thermoplastic pipes according to claim 7, it is characterised in that: the step b
In to blank implement air it is cooling after, by infrared radiation thermometer measure device and Preform surface temperature lower than 30 DEG C of holding temperature ~
100 DEG C, it is cooling that cold water is then carried out again.
9. the hot bending shape process of thermoplastic pipes according to claim 5, it is characterised in that: the step c
The temperature of middle hot water is higher than 20 DEG C ~ 50 DEG C of blank actual work temperature, and soaking time controls within the scope of 5 minutes ~ 15 minutes,
After blank reaches water temperature together with hot bending shape device and taking-up in 5 minutes ~ 15 minutes is kept the temperature, then utilizing temperature again is 15 DEG C
~ 25 DEG C of water carries out water cooling, controls within the scope of 1 minute ~ 10 minutes cooling time.
10. the hot bending shape process of thermoplastic pipes according to claim 5, it is characterised in that: if blank is
Rebound or deformed workpiece occur under certain working condition, preheating process is additionally provided with before implementation steps a, it is described pre-
The detailed process of heating process is: making a mark line in workpiece bows center, then placing it in temperature is 80 DEG C ~ 200
DEG C baking oven in heat 5 minutes ~ 30 minutes, keep the temperature 5 minutes ~ 30 minutes at being then 80 DEG C ~ 200 DEG C in oven temperature.
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