CN110027139A - A kind of mould preparation method, mold, mold heating system and method for heating and controlling - Google Patents
A kind of mould preparation method, mold, mold heating system and method for heating and controlling Download PDFInfo
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- CN110027139A CN110027139A CN201910240902.5A CN201910240902A CN110027139A CN 110027139 A CN110027139 A CN 110027139A CN 201910240902 A CN201910240902 A CN 201910240902A CN 110027139 A CN110027139 A CN 110027139A
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/04—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/7604—Temperature
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of mould preparation method, mold, mold heating system and method for heating and controlling.This method comprises: S1, divides heating region；S2 pre-sets at least one heating flow channel, heating flow channel structural parameter determining method in each heating region are as follows: S21 presets heating flow channel structural parameters；S22 obtains the practical heating curves of each heating region and the actual temperature of mold cavity surface each position point；S23, variance analysis simultaneously adjust hot runner structure parameter according to variance analysis result；S24 repeats S22, S23；S3 processes to form runner according to heating flow channel structural parameters.Mold subregion is heated, each heating region individually carries out flow passage structure parameter and determines, the temperature uniformity of the thermal response speed and entire type chamber that guarantee mold entirety is met the requirements, and this method can satisfy the fast change mould temperature demand of complicated modular construction, be convenient for partition heating.
Description
Technical field
The present invention relates to injection molding arts, more particularly to a kind of mould preparation method, mold, mold heating system and heating
Control method.
Background technique
It has a extensive future currently, becoming mould temperature technique fastly in the field that bloom is molded, compared to conventional injection molding technology, becomes mould fastly
Temperature technique can significantly improve plastic surface quality, obtain surface bloom and the plastic product without molten trace.
In existing fast change mould temperature technique, generally use electromagnetic induction heating, oil heating, flame heating, electric heating with
And high-temperature steam heating etc., wherein high-temperature steam realize it is fast become mould temperature technique it is opposite for other technologies with low energy consumption,
The small advantage of environmental pollution, therefore by favor.And become the quick heating effect of mould temperature technique fastly with mold body geometry
Feature is closely related, particular for there are more curved surfaces, multi-step, porous pit, the isostructural module of slype, traditional moulds
Heating design does not account for above-mentioned geometry bring melt flows otherness, so that the mold that traditional design method obtains
Thermal response be deteriorated, the temperature uniformity of mold cavity surface is bad, causes that product quality is bad or the high photosensitiveness in surface is poor.
Master thesis (title: rapid mould temperature variable injection mould disclosed in 2013 year of University Of Chongqing in the prior art
Heating pipe optimization design；Author: Dong Jingjing；Time of disclosure: on October 31st, 2013) disclose be arranged in mold it is multiple plus
Hot flow path is passed through high-temperature steam in each heating flow channel, through diameter to heating flow channel, spacing, at a distance from type chamber
It designs to realize the fast design for becoming mould temperature mold, but only considers that ensemble average effect is not able to satisfy under quick heating condition
The partition heating requirement of labyrinth.It can not achieve mold partition heating, subregional mould temperature high-precision control, there are temperature controls
The problem of system inaccuracy, each region heating of module is uneven, leads to unstable product quality.
Summary of the invention
The present invention is directed at least solve the technical problems existing in the prior art, a kind of mold system is especially innovatively proposed
Preparation Method, mold, mold heating system and method for heating and controlling.
In order to realize above-mentioned purpose of the invention, according to the first aspect of the invention, the present invention provides a kind of molds
Preparation method, comprising:
Step S1 obtains the structural parameters of target module, obtains and the matched type chamber of the target module and mold ruler
It is very little；
The a plurality of heating curves of mold is obtained in conjunction with die size, modular construction, raw material thermal physical property parameter and Shooting Technique；
According to die size, mold is divided into two or more heating zones by cavity structure or raw material thermal physical property parameter
Domain；
Cavity structure, the raw material thermal physical property parameter that position, heating region in conjunction with where heating region on mold include
With heating curves；
According to heating region inner mold chamber surface texture, the normal temperature uniformity is set；
Step S2, pre-sets at least one heating flow channel in each heating region, and the heating flow channel structural parameters are true
Determine method are as follows:
The heating flow channel structural parameters include quantity, diameter, length, mutual spacing, with mold cavity surface away from
Some or all of from；
Step S21 pre-sets heating flow channel structural parameters；
Step S22 carries out unsteady state circumstance to mold rapid heating process, and the practical heating for obtaining each heating region is bent
The actual temperature of line and mold cavity surface each position point；
Step S23, the actual temperature based on mold cavity surface each position point obtain the actual temperature uniformity, and practical heating is bent
Line carries out variance analysis with the corresponding normal temperature uniformity with corresponding heating curves, the actual temperature uniformity, and according to inclined
Difference analyses result and adjusts heating region internal heated runner structural parameters；
Step S24, repeat step S22, step S23, until heating region practical heating curves and heating curves it is inclined
The deviation of difference and/or the actual temperature uniformity and the normal temperature uniformity is in deviation range；
Step S3 processes to form runner according to heating flow channel structural parameters.
Having the beneficial effect that meet the needs of modular construction, die size and property of raw material for above-mentioned technical proposal, will
Mold subregion is heated, and each heating region individually carries out flow passage structure parameter and determines, ensure that the heat of each heating region
The temperature uniformity of response speed and its internal mold cavity surface meets the requirements, so guarantee the thermal response speed of mold entirety with
The temperature uniformity of entire type chamber is met the requirements, which can satisfy complicated modular construction compared to the prior art
Fast change mould temperature demand, be convenient for partition heating.
In order to realize above-mentioned purpose of the invention, according to the second aspect of the invention, the present invention provides a kind of mold,
Multiple heating flow channels including type chamber and outside the type chamber, the structural parameters of the heating flow channel are according to of the present invention
Mould preparation method determines.
Above-mentioned technical proposal has the beneficial effect that the beneficial effect with above-mentioned mould preparation method.
In order to realize above-mentioned purpose of the invention, according to the third aspect of the present invention, the present invention provides a kind of molds
Heating system, be divided into including high temperature fluid source, by the high temperature fluid that the high temperature fluid source exports diversion mechanism at least all the way,
Mold and controller of the present invention；
The diversion mechanism includes at least one fluid inlet, selectable multiple fluid outlets, and with the fluid
Export multiple first flow regulating valves of corresponding control fluid outlet flow；
One heating flow channel and a fluid outlet pass through piping connection；
The controller carries out process matching to the on-off and flow of the fluid outlet of the diversion mechanism；The height of controller
Warm fluid control terminal is electrically connected with the switch terminals in high temperature fluid source, the first valve control terminal and first flow regulating valve of controller
Control terminal electrical connection.
The architectural characteristic and difference of above-mentioned technical proposal having the beneficial effect that for different molds, different injection molding modules
Raw material, give heating flow channel to distribute fluid outlet, in conjunction with the on-off and flow of each fluid outlet of control process,
It realizes the process optimization that different molds quickly heat, improve heating efficiency and shortens the process-cycle, pass through reasonable disposition stream
Quantity, throughput time and the flow of body outlet adapt to the demand for heat of different injection raw materials, module and mold, have general
Property.
In order to realize above-mentioned purpose of the invention, according to the fourth aspect of the present invention, the present invention provides one kind to be based on
The quick method for heating and controlling of the mold of mold heating system of the present invention, comprising:
Step A obtains a plurality of of mold in conjunction with die size, modular construction, raw material thermal physical property parameter and Shooting Technique and adds
Heating curve obtains multiple target heating durations and its corresponding multiple target temperatures；
Step B, according to die size, two or more are arranged on mold in modular construction or raw material thermal physical property parameter
Heating region is that the heating flow channel in heating region distributes fluid outlet；
Step C, the hot physical property of cavity structure, raw material that position, heating region in conjunction with where heating region on mold include
Parameter matches heating curves, and obtains regional aim temperature based on the heating curves；
Step D, flow of the controller based on high temperature fluid in heating flow channel in regional aim temperature control heating region；
Step E, unlatching and/or pass of the controller based on the time parameter control first flow regulating valve on heating curves
It is disconnected；
It or further include temperature information adjusting each heating of the controller according to the temperature sensor feedback being arranged on mold
In region in heating flow channel the step of the flow of high temperature fluid.
Having the beneficial effect that meet the needs of modular construction, die size and property of raw material for above-mentioned technical proposal, will
Mold partition heating, different heating region are provided with different regional aim temperature, to each hot flow path flow of heating region
Individually control, keeps computer heating control more accurate, quickly heats, and improves the efficiency and product quality of mold heating, and entire mold
Target temperature can be rapidly achieved.Avoiding flow in conventional flow field heating method can not change, be unable to specific aim region heating with
And the problem that heating speed is slower.
Detailed description of the invention
Fig. 1 is that flow chart is embodied in a kind of application scenarios in mould preparation method in the present invention；
Fig. 2 is the process signal schematic diagram of mould preparation method in the embodiment of the invention；
Fig. 3 is the front view of diversion mechanism in the embodiment of the invention；
Fig. 4 is the rearview of diversion mechanism in the embodiment of the invention；
Fig. 5 is the system block diagram of mold heating system in the embodiment of the invention；
Fig. 6 is die heating zone distribution schematic diagram in the embodiment of the invention.
Appended drawing reference:
1 fluid inlet；2 fluid outlets；3 first flow regulating valves；4 magnetic parts；5 second flow regulating valves；6 temperature sensing
Device；7 high temperature fluid sources；8 controllers；9 molds；91 heating regions one；92 heating regions two；93 heating regions three；10 heating streams
Road；11 module type chambers；12 pouring slots.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to limit of the invention
System.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can
, can also indirectly connected through an intermediary, for the ordinary skill in the art to be to be connected directly, it can basis
Concrete condition understands the concrete meaning of above-mentioned term.
Invention provides a mold preparation method, is illustrated in figure 2 the flow diagram of this method, packet
It includes:
Step S1 obtains the structural parameters of target module, obtains and the matched type chamber of the target module and mold ruler
It is very little；
The a plurality of standard heating of mold is obtained in conjunction with die size, modular construction, raw material thermal physical property parameter and Shooting Technique
Curve；
According to die size, mold is divided into two or more heating zones by cavity structure or raw material thermal physical property parameter
Domain；
Cavity structure, the raw material thermal physical property parameter that position, heating region in conjunction with where heating region on mold include
With standard heating curves；
According to heating region inner mold chamber surface texture, the normal temperature uniformity is set；
Step S2 pre-sets at least one heating flow channel, heating flow channel structural parameters determination side in each heating region
Method are as follows:
Heating flow channel structural parameters include quantity, diameter, length, mutual spacing, at a distance from mold cavity surface in
Some or all of；
Step S21 pre-sets heating flow channel structural parameters；
Step S22 carries out unsteady state circumstance to mold rapid heating process, and the practical heating for obtaining each heating region is bent
The actual temperature of line and mold cavity surface each position point；
Step S23, the actual temperature based on mold cavity surface each position point obtain the actual temperature uniformity, and practical heating is bent
Line carries out variance analysis with the corresponding normal temperature uniformity with corresponding heating curves, the actual temperature uniformity, and according to inclined
Difference analyses result and adjusts heating region internal heated runner structural parameters；
Step S24, repeat step S22, step S23, until heating region practical heating curves and heating curves it is inclined
The deviation of difference and/or the actual temperature uniformity and the normal temperature uniformity is in deviation range；
Step S3 processes to form runner according to heating flow channel structural parameters.
In the present embodiment, the workpiece of target module, that is, to be processed, by the structure snd size of target module according to existing
(patent that such as can refer to Publication No. CN204278391U or CN103707455B mentions the Injection Mold Design method for having in technology
The technical solution of confession obtains die ontology size) shape and size of cavity structure and size and injection mold ontology are obtained,
In the process die ontology size need the minimum thickness that is obtained under the premise of the service life for meeting use intensity and using and
In addition minimum wall thickness (MINI W.) presses heating target temperature, minimizes mold weight.Deviation range can be actual value (the 100 of standard value
± 5) within the scope of %.
In the present embodiment, from heating curves can target temperature, when heating region match heating curves after, according to
The heating curves matched is capable of the target temperature of the heating region, and the normal temperature uniformity includes the uniformity and/or standard in standard
The lower uniformity is big plane, cambered surface or other surfaces for having bloom to require, the uniformity and mark in standard for mold cavity surface
The lower uniformity of standard is 1%, is 5% for the uniformity under the uniformity in other surfaces standard and standard.Temperature uniformity body
The temperature difference of existing mold cavity surface influences molding effect when plastic melt cooling.It is actually equal that a kind of quickly calculating is disclosed as follows
The method of evenness or the practical lower uniformity:
The actually uniformity=(practical maximum temperature-target temperature)/target temperature, at this point, practical maximum temperature is greater than
Target temperature；
The practical lower uniformity=(the practical maximum temperature of target temperature -)/target temperature, at this point, practical maximum temperature is less than
Target temperature.
In the present embodiment, injection molding process is broadly divided into molding, injection, pressure maintaining, cooling, die sinking, product take
Six stages out before material injecting mould 9 in the molten state, need to heat on mold 9, and raw material injection is finished in mold 9
It is middle need to cured or sulfidation, then demoulding while hot.In technique, there is a heating curves to the heating of mold 9, the heating is bent
The horizontal axis of line is time (unit can be the second), and ordinate represents the temperature of mold 9, there is a target temperature on heating curves, when
After mold 9 reaches target temperature, heating system allow mold 9 keep target temperature for a period of time (unit can be the second), later again into
Row cooling, which can be molded steam heating method in production according to this field and obtain, for theoretical heating curves.
In the present embodiment, different 9 sizes of mold, modular construction, raw material thermal physical property parameter have shadow to heating process
It rings, theoretical heating curves is not able to satisfy actual needs, needs according to corresponding amendment is done on theoretical heating curves, therefore, can base
In theoretical heating curves obtain a plurality of 9 size of combination mold, modular construction, raw material thermal physical property parameter heating curves.
The size of mold 9 has an impact to heating process, and such as large scale mold 9, distal line is longer, fluid resistance and dissipate
Heat loss all significantly increases, and heating effect is deteriorated, therefore the distance on mold 9 apart from pouring slot 12 is different, the target needed
Temperature is just different, sets the target on theoretical curve for the target temperature of 12 place mold of pouring slot, 9 part and heating duration
Temperature and heating duration by the target temperature away from calculating at a distance from pouring slot 12, needed and heat duration and distance correlation
The increase of (preferred, linearly increasing convenient for being calculated as).
Modular construction difference needs target temperature different, such as bending, ladder labyrinth are than simple structures such as cuboids
Higher target temperature and heating duration are needed, when needing higher target temperature and heating than wall thickness place such as the thin place of Modular wall
Long, to avoid because raw material molten mass and wall surface temperature are there are the larger temperature difference, heat is quickly transmitted in 9 body of mold, is melted herein
The problem of body viscosity increases sharply, is unfavorable for subsequent flowing, the generally target temperature by modular construction simply and at module wall thickness
It is set as target temperature on theoretical heating curves and heating duration with heating duration, the target temperature at structure is complicated place and the thin place of wall
Degree and heating duration increase on theoretical heating curves according to test of many times result.
The thermal physical property parameter of different material is different, and thermal physical property parameter is material viscosity-temperature relation, when the viscosity-of raw material
When temperature is weak related, the target temperature and heating duration of mold can be set to target temperature and heating in theoretical heating curves
Duration, when the viscosity versus temperature strong correlation of raw material, when needing to increase target temperature and heating on the basis of theoretical heating curves
Long, the specific numerical value that increases can be obtained according to test of many times result.
9 size of mold, modular construction, any one in raw material thermal physical property parameter or both or three exist simultaneously needs and repair
When positive theory heating curves, the correction amount (i.e. target temperature incrementss and heating duration incrementss) of each should be overlapped,
It preferably, is linear superposition, a plurality of heating curves available in this way.
In the present embodiment, according to different 9 size ranges of mold, modular construction, raw material thermal physical property parameter, by mold
9 points are different heating regions, include at least one heating flow channel 10 inside each heating region.
In the present embodiment, unsteady state circumstance is preferably but not limited to carry out using simulation softwares such as CFD.
In the preferred embodiment of the present invention, in step sl, the division methods of heating region are as follows:
According to the distance away from mold pouring slot, it is divided into different heating regions；
And/or the wall thickness grade according to modular construction, it is divided into different heating regions；
And/or according to flow resistance different in mold cavity, it is divided into different heating regions.Above-mentioned technical proposal has
Beneficial effect are as follows: disclose the method for heating region division and the method for regional aim temperature setting, method is reasonable, has general
Property.
In the present embodiment, for the mold 9 of large scale module or thin wall module, subregion setting is even more important.
For large scale module, it can be divided into different heating regions according to the distance away from 9 pouring slot 12 of mold, such as be divided into three
Heating region, respectively proximal end heating region, middle-end heating region and distal end heating region.The regional aim of each heating region
Temperature is different with target heating duration, can be by its area if distal end heating region is to resist scattering losses and fluid impedance loss
Target temperature setting in domain is higher than target temperature, and the flow for being passed through fluid increases.
In the present embodiment, heating region division, module wall thickness regions and Modular wall are carried out according to module wall thickness grade
Thin region is separately heated, to avoid in the quickly easily caused injection molding quality decline of solidification of the thin region raw material solution of Modular wall.
In the present embodiment, raw material solution is in the intracavitary flow passage resistance force of waterproof of 9 type of mold by raw material itself, module wall thickness, mould
The structure features such as part shape influence, as the flow resistance of modular construction complex region is greater than modular construction region, module wall thickness area
The flow resistance in domain is less than the thin region of Modular wall；For flow resistance large area compared to flow resistance smaller area, heating
Target temperature higher should answer longer with heating duration.
In the preferred embodiment of the present invention, the following structure ginseng for more easily presetting heating flow channel is disclosed
Several methods, step S21 are specifically included::
Step S211, the initial diameter of heating flow channel are set as 8-12 ㎜；
Step S212, heating flow channel are preset at a distance from mold cavity surface and are set to 15-20 ㎜；
Step S213, the heating flow channel of entire mould inside are uniformly distributed, and are parallel to each other and through mold, based on mold plus
The heat balance principle of heat required total amount of heat and steam heat convection, obtains the Composite Walls h of steamSteamAre as follows:
hSteam=ρMold·VMold·CP mold(T1-T0)；
The coefficient of heat transfer h of single heating flow channel0Are as follows:
Obtain the heating flow channel quantity n of entire mold are as follows:
The heating flow channel quantity n of i-th of heating regioniAre as follows:
The spacing k of heating flow channel are as follows:
Wherein, ρMoldFor the density of material of mold, units/kg/m3；VMoldFor the Effective heating volume of mold, unit m3；CP mold
For mold materials specific heat capacity, unit kJ/kg.K；T1For according to the target temperature of Shooting Technique mold, unit K；T0For the first of mold
Beginning temperature, unit K；Ga is grashof number, dimensionless group；dRunnerFor the diameter of section of heating flow channel, unit m；vSteamIt is logical
Enter the high temperature fluid volume of single heating flow channel；ρSteamFor fluid density；λ is flow thermal conductivity coefficient, unit W/m2K；ηSteamFor stream
The thickness of liquid film of body, unit m, Prs are tube fluid Prandtl number, dimensionless group；Prw is wall surface Prandtl number, dimensionless group；
L is the width of mold heating flow channel arrangement cross section.
In the preferred embodiment of the present invention, in step S23, practical heating curves is bent with corresponding heating
Line carries out variance analysis, and the step of adjusting heating flow channel structural parameters according to variance analysis result specifically includes:
Step S231 obtains the heating time t for reaching set temperature in practical heating curves from initial temperatureIt is real, heating song
Reach the heating time t of set temperature in line from initial temperatureMark；
Step S232, if tIt is realIn tMarkDeviation range in, without adjusting heating flow channel structural parameters；If tIt is realNot in tMarkIt is inclined
In poor range, and work as tIt is real< tMarkWhen, it reduces the heating flow channel quantity in the heating region and/or reduces all or part of heating stream
The diameter in road, works as tIt is real> tMark, increase the heating flow channel quantity in the heating region and/or increase all or part of heating flow channel
Diameter.
Above-mentioned technical proposal has the beneficial effect that providing one kind adjusts heating flow channel part-structure parameter quickly to meet
The method of standard requirements.
In the preferred embodiment of the present invention, in step S23, by the actual temperature uniformity and corresponding standard
Temperature uniformity carries out variance analysis, and the step of adjusting heating flow channel structural parameters according to variance analysis result specifically includes:
Step S233, uniformity U in acquisition standardIt puts onWith uniformity U under standardUnder mark, calculate mold cavity surface each position point
Actually temperature uniformity UIn realityOr practical lower temperature uniformity UUnder reality；
Step S234, if location point UIn realityIn UIt puts onDeviation range in or UUnder realityIn UUnder markDeviation range in, be not necessarily to
Adjust heating flow channel structural parameters；If location point UIn realityNot in UIt puts onDeviation range in, and UIn reality> UIt puts on, then increase the position
Spacing between heating flow channel near point and mold cavity surface distance and/or increase heating flow channel, if location point UUnder realityDo not exist
UUnder markDeviation range in, and UUnder reality< UUnder mark, then reduce heating flow channel near the location point and mold cavity surface distance and/or subtract
Spacing between small heating flow channel.
Above-mentioned technical proposal has the beneficial effect that providing one kind adjusts heating flow channel part-structure parameter quickly to meet
The method of standard requirements.
In a kind of application scenarios of inventive die preparation method, detailed process is as shown in Figure 1, comprising:
Step 1: determining mold geometry feature and dimensional parameters, under conditions of only considering the whole quickly heating of mold,
The default quantity of heating flow channel, the diameter of heating flow channel, the length of heating flow channel, heating flow channel are at a distance from mold cavity surface.
Step 2: CFD software (English full name (Computational Fluid Dynamics), i.e. calculating fluid are utilized
Dynamics is a hydromechanical branch, abbreviation CFD.), mold 3-D geometric model is established, constructs depanning to complete and accurate
Have all geometrical characteristics；Divide heating region；The heat source that inlet and outlet boundary and wall boundary condition, heating flow channel is arranged is joined
The division of several, fluid and solid area determines mold materials parameter and fluid thermophysical property parameter；
The evaluation criterion for establishing mold hot response analysis and the distribution of mold cavity surface temperature uniformity, specifically, for module
Size class, mold cavity surface complexity, different injection raw material rheological behaviors determine that heating process requires obtained heating
Curve and temperature uniformity degree are distributed.
Step 3: completing the unsteady state circumstance of mold rapid heating process, analyze calculated result, is tied using calculating
Fruit obtains practical heating curves: i.e. temperature (T)-time (S) curve.The practical heating curves that comparing calculation goes out adds with matched
Heating curve analyzes relative error, to evaluate whether heating effect produces a desired effect.Simultaneously according to the temperature of mold cavity
Distribution map calculates its temperature uniformity whether within the scope of the allowable error of the normal temperature uniformity.
Step 4: the evaluation analysis standard provided by step 2 compares acquired results in step 3, such as meets expection, i.e.,
Determine the geometry of mold.If not meeting desired effect, for the quantity of heating flow channel, diameter, length and heating flow channel with
The distance of mold cavity surface optimizes, and steps be repeated alternatively until to obtain standard compliant mold heating structure design scheme.
The present invention also provides a kind of molds, multiple heating flow channels including type chamber and outside type chamber, heating flow channel
Structural parameters mould preparation methods according to the invention determines.
The present invention also provides a kind of mold heating systems, in a preferred embodiment, as shown in figure 5, the mold
Heating system include high temperature fluid source 7, the high temperature fluid that high temperature fluid source 7 exports is divided into diversion mechanism at least all the way, this
The mold and controller 8 of invention；
As shown in figure 3, diversion mechanism includes at least one fluid inlet 1, multiple fluid outlets 2, and with fluid outlet 2
Multiple first flow regulating valves 3 of corresponding control 2 flow of fluid outlet.
One heating flow channel 10 and a fluid outlet 2 pass through piping connection；
Controller 8 carries out process matching to the on-off and flow of the fluid outlet 2 of diversion mechanism；The high-temperature stream of controller 8
Body control terminal is electrically connected with the switch terminals in high temperature fluid source 7, the first valve control terminal and first flow regulating valve 3 of controller 8
Control terminal electrical connection.
In the present embodiment, high temperature fluid source 7 is preferably but not limited to as steam generator, and high temperature fluid is that high-temperature water steams
Vapour.Controller 8 is the single-chip microcontroller or MCU acquired with data operation ability and A/D.Preferably, controller 8 passes through oneself
I/O interface or D/A pin export the control terminal de-regulation first flow regulating valve 3 of electric signal to first flow regulating valve 3
Valve opening, and then adjust the stream of the 10 high temperature fluid of heating flow channel of the 3 place fluid outlet 2 of first flow regulating valve connection
Amount, on-off.
In the present embodiment, it for larger-size mold 9, apart from the farther away distal end of pouring slot 12 and is being closer
Proximal end, high temperature fluid reaches distal end or temperature when proximal end is different；And the different piece heating temperature for thin wall moldings
Difference is had with heating duration, as turning or thinner thickness means suitable heating time are longer；Joined according to the hot physical property of raw material
Number, such as freezing point, fusing point, the valve opening that controller controls the first flow regulating valve 3 on distal end heating flow channel 10 is larger,
Enlargement discharge is influenced, the turning of control module or the first flow tune on thinner thickness part heating flow channel 10 with reducing heat dissipation
3 opening time of valve is saved, is required with meeting injection molding.
In the present embodiment, fluid outlet 2 can uniformly or the uneven surrounding for being laid in fluid inlet 1.To increase fluid
The Fluid pressure of outlet 2, can be set greater than 1 for fluid inlet 1, and such as two.First flow regulating valve 3 can be to open manually
Closing valve or electromagnetism are than column control valve.The good material of the preferred heat resistance of diversion mechanism is made, such as steel.
In the present embodiment, it is preferred that as shown in figure 4, diversion mechanism further includes the magnetism for fixing diversion mechanism
Part 4.Magnetic part 4 can be one or more thin slice magnet or cylinder-shaped magnet with strong magnetic force property, can be in diversion mechanism
Opened up on either end facet with the matched groove of the shape of magnetic part 4, magnetic part 4 can by be bonded or be interference fitted etc. modes with it is recessed
Slot is fixedly connected.
In the present embodiment, it is preferred that further include the thermal insulation material for wrapping up diversion mechanism all or part outer surface.It protects
The material that adiabator selects heat transfer property low, such as plastic foam.
It in the preferred embodiment of the present invention, further include at least one temperature sensor being arranged on mold 9
6, the output end of temperature sensor 6 is electrically connected with the temperature input of controller 8；
It and/or further include the second flow regulating valve 5 being arranged at fluid inlet 1, the second valve control terminal of controller 7
It is electrically connected with the control terminal of second flow regulating valve 5.
Above-mentioned technical proposal has the beneficial effect that using mold temperature as heating feedback signal, each stream easy to adjustment in time
On-off, the flow of body outlet, and cutting high temperature fluid source, can accurately control heating process, improve the accuracy of heating,
Promote the quality of moulding；It can be opened or closed diversion mechanism work, fluid further can also be passed through to diversion mechanism
Total amount is regulated and controled.
In the present embodiment, it is preferred that temperature sensor 6 can be multiple, the different zones being distributed on mold 9.It can
Thermocouple temperature sensor is selected, the A/D pin on controller 7 is electrically connected with the output end of temperature sensor 6, with temperature collection
Signal is simultaneously converted to digital signal, so as to the processing of controller 8.Second flow regulating valve 5 is preferably but not limited to as electromagnetism than column control
Valve processed, controller 7 export the control terminal de-regulation the of electric signal to second flow regulating valve 5 from its I/O interface or D/A pin
The valve opening of two flow control valves 5, and then adjust the flow of diversion mechanism fluid inlet 1.
The present invention also provides a kind of quick method for heating and controlling of the mold based on mold heating system of the invention, packets
It includes:
Step A obtains a plurality of of mold in conjunction with die size, modular construction, raw material thermal physical property parameter and Shooting Technique and adds
Heating curve obtains multiple target heating durations and its corresponding multiple target temperatures；
Step B, according to die size, two or more are arranged on mold in modular construction or raw material thermal physical property parameter
Heating region is that the heating flow channel in heating region distributes fluid outlet；
Step C, the hot physical property of cavity structure, raw material that position, heating region in conjunction with where heating region on mold include
Parameter matches heating curves, and obtains regional aim temperature based on heating curves；
Step D, flow of the controller based on high temperature fluid in heating flow channel in regional aim temperature control heating region；
Step E, unlatching and/or pass of the controller based on the time parameter control first flow regulating valve on heating curves
It is disconnected；
It or further include temperature information adjusting each heating of the controller according to the temperature sensor feedback being arranged on mold
In region in heating flow channel the step of the flow of high temperature fluid.
In the present embodiment, the fluid outlet 2 one in the heating flow channel 10 of each heating region and diversion mechanism is a pair of
Pipeline is answered to connect, the quantity of fluid outlet 2 is preferably greater than or equal to 10 quantity of heating flow channel, can covering and heat insulating material in pipeline periphery
Material, to reduce radiation loss.
In the present embodiment, after having divided heating region, according on mold 9 where the region position, included
Partly molding cavity structure, raw material thermal physical property parameter match heating curves, and different heating regions possesses different heating curves, and base
Regional aim temperature and heating time parameter are obtained in the heating curves, controller is passed through the flow of heating flow channel 10 by control
(i.e. the aperture of first flow regulating valve 3) adjusts the temperature of 10 place heating region of heating flow channel, and controller passes through control the
One flow control valve 3 opens or closes to match the time parameter on heating curves.
In a kind of application scenarios for dividing heating region in quick method for heating and controlling provided by the invention, such as Fig. 6 institute
Show, is divided into mold 9 in conjunction with the distance apart from pouring slot 12, the wall thickness of module type chamber 11, the flow passage resistance force of waterproof of raw material molten mass
Three heating regions, respectively heating region 1, heating region 2 92 and heating region 3 93 include in each heating region
There is a heating flow channel 10.On the one hand, heating region 2 92 is nearest apart from pouring slot 12, followed by heating region 1 and heating
Region 3 93 does not consider that the regional aim temperature T2 of other factors heating region 2 92 should be lower than the target temperature of heating region 3 93
Spend the target temperature T1 of T3 and heating region 1；On the other hand, it can be seen that heating region two from the structure of module type chamber 11
Modular wall is most thick in 92 and flow resistance is minimum, and Modular wall is most thin in heating region 1 and heating region 3 93 and runner
Resistance is maximum, does not consider that the target temperature T2 of other factors heating region 2 92 should be lower than the target temperature T1 of heating region 1
With the target temperature T3 of heating region 3 93；In conjunction with above-mentioned two aspect, set the target temperature T2 of heating region 2 92 to
110 DEG C of target temperature in theoretical heating curves, heating duration is set as the heating duration in theoretical heating curves, by heating zone
The target temperature T1 in domain 1 and the target temperature T3 of heating region 3 93 are disposed as 120 DEG C, higher than heating region 2 92
The heating duration of target temperature T2, heating region 1 and heating region 3 93 is set greater than the heating in theoretical heating curves
Duration.
According to heat balance principle, heat Q and steam bring efficient heat Q that the heating region of mold 9 obtainsSteam heatingPhase
Deng having:
QSteam heating=Q；
According to thermal convection principle, above-mentioned formula is derived, obtains the high temperature fluid stream of heating flow channel 10 in step D
Measure the calculation formula of q are as follows:
Wherein, q is high temperature fluid flow；A1For 10 area of section of heating flow channel, unit m2；ToutFor the outlet of heating flow channel 10
Temperature, unit K；TiFor 10 inlet temperature of heating flow channel, unit K；A is 10 inner wall surface area of heating flow channel, unit m2；ηSteamFor stream
The thickness of liquid film of body, unit m；ViFor Effective heating volume of the heating flow channel 10 on mold 9, unit m3；T1iFor heating flow channel
The regional aim temperature of 10 regions, unit K；ToiFor the initial temperature of 10 region of heating flow channel, unit K.
According to above formula, the flow q of runner can be acquired, further according to flow and valve opening relationship and valve opening with
The relationship (the product manual setting that can refer to the first flow regulating valve 3 of selection) of signal magnitude is controlled, controller 8 exports properly
Control terminal of the control voltage to first flow regulating valve 3, controlling opening of valve, to adjust the high-temperature stream in heating flow channel 10
The flow of body.Preferably, a flow sensor can be set on each 2 place pipeline of fluid outlet, for detection and fluid
Export the flow of the high temperature fluid in the heating flow channel 10 of 2 piping connections, the flow letter that controller 8 is fed back based on flow sensor
Breath, to adjust the valve opening of first flow regulating valve 3, such flow control is more accurate.
In the present embodiment, ViFor Effective heating volume of the heating flow channel 10 on mold 9, it is preferably but not limited to, it should
10 place heating region of heating flow channel occupies the volume of mold 9 divided by the quantity of heating flow channel 10 in the heating region.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (10)
1. a kind of mould preparation method characterized by comprising
Step S1 obtains the structural parameters of target module, obtains and the matched type chamber of the target module and die size；
The a plurality of heating curves of mold is obtained in conjunction with die size, modular construction, raw material thermal physical property parameter and Shooting Technique；
According to die size, mold is divided into two or more heating regions by cavity structure or raw material thermal physical property parameter；
It matches and adds in conjunction with cavity structure, the raw material thermal physical property parameter that the position on the mold of heating region place, heating region include
Heating curve；
According to heating region inner mold chamber surface texture, the normal temperature uniformity is set；
Step S2 pre-sets at least one heating flow channel, heating flow channel structural parameters determination side in each heating region
Method are as follows:
The heating flow channel structural parameters include quantity, diameter, length, mutual spacing, at a distance from mold cavity surface in
Some or all of；
Step S21 pre-sets heating flow channel structural parameters；
Step S22, to mold rapid heating process carry out unsteady state circumstance, obtain each heating region practical heating curves and
The actual temperature of mold cavity surface each position point；
Step S23, actual temperature based on mold cavity surface each position point obtain the actual temperature uniformity, by practical heating curves with
Corresponding heating curves, the actual temperature uniformity carry out variance analysis with the corresponding normal temperature uniformity, and according to deviation point
It analyses result and adjusts heating region internal heated runner structural parameters；
Step S24, repeat step S22, step S23, until the practical heating curves of heating region and the deviation of heating curves and/
Or the deviation of the actual temperature uniformity and the normal temperature uniformity is in deviation range；
Step S3 processes to form runner according to heating flow channel structural parameters.
2. mould preparation method as described in claim 1, which is characterized in that in the step S1, the division of heating region
Method are as follows:
According to the distance away from mold pouring slot, it is divided into different heating regions；
And/or the wall thickness grade according to modular construction, it is divided into different heating regions；
And/or according to flow resistance different in mold cavity, it is divided into different heating regions.
3. mould preparation method as described in claim 1, which is characterized in that the step S21 is specifically included:
Step S211, the initial diameter of heating flow channel are set as 8-12 ㎜；
Step S212, heating flow channel are preset at a distance from mold cavity surface and are set to 15-20 ㎜；
Step S213, the heating flow channel of entire mould inside are uniformly distributed, and are parallel to each other and are run through mold, heat institute based on mold
The heat balance principle of the total amount of heat and steam heat convection that need, obtains the Composite Walls h of steamSteamAre as follows:
hSteam=ρMold·VMold·CP mold(T1-T0)；
The coefficient of heat transfer h of single heating flow channel0Are as follows:
Obtain the heating flow channel quantity n of entire mold are as follows:
The heating flow channel quantity n of i-th of heating regioniAre as follows:
The spacing k of heating flow channel are as follows:
Wherein, ρMoldFor the density of material of mold, units/kg/m3；VMoldFor the Effective heating volume of mold, unit m3；CP moldFor mould
Have material specific heat capacity, unit kJ/kg.K；T1For according to the target temperature of Shooting Technique mold, unit K；T0For the initial temperature of mold
Degree, unit K；Ga is grashof number, dimensionless group；dRunnerFor the diameter of section of heating flow channel, unit m；vSteamTo be passed through list
The high temperature fluid volume of a heating flow channel；ρSteamFor fluid density；λ is flow thermal conductivity coefficient, unit W/m2K；ηSteamFor fluid
Thickness of liquid film, unit m, Prs are tube fluid Prandtl number, dimensionless group；Prw is wall surface Prandtl number, dimensionless group；L is
The width of mold heating flow channel arrangement cross section.
4. mould preparation method as described in claim 1, which is characterized in that the normal temperature uniformity includes equal in standard
The uniformity under evenness and/or standard；
And/or the actual temperature uniformity includes the actually uniformity and/or the practical lower uniformity；
The actually uniformity=(practical maximum temperature-target temperature)/target temperature, at this point, the practical maximum temperature
Greater than target temperature；
The uniformity=(the practical maximum temperature of target temperature -)/target temperature under the reality, at this point, the practical maximum temperature
Less than target temperature.
5. mould preparation method as described in claim 1, which is characterized in that in the step S23, by practical heating curves
Variance analysis is carried out with corresponding heating curves, and the step of adjusting heating flow channel structural parameters according to variance analysis result is specific
Include:
Step S231 obtains the heating time t for reaching set temperature in practical heating curves from initial temperatureIt is real, in heating curves
Reach the heating time t of set temperature from initial temperatureMark；
Step S232, if tIt is realIn tMarkDeviation range in, without adjusting heating flow channel structural parameters；If tIt is realNot in tMarkDeviation model
In enclosing, and work as tIt is real< tMarkWhen, it reduces the heating flow channel quantity in the heating region and/or reduces all or part of heating flow channel
Diameter works as tIt is real> tMark, increase the heating flow channel quantity in the heating region and/or increase the straight of all or part of heating flow channel
Diameter.
6. mould preparation method as claimed in claim 4, which is characterized in that in the step S23, actual temperature is uniform
Degree carries out variance analysis with the corresponding normal temperature uniformity, and adjusts heating flow channel structural parameters according to variance analysis result
Step specifically includes:
Step S233, uniformity U in acquisition standardIt puts onWith uniformity U under standardUnder mark, calculate the reality of mold cavity surface each position point
Upper temperature uniformity UIn realityOr practical lower temperature uniformity UUnder reality；
Step S234, if location point UIn realityIn UIt puts onDeviation range in or UUnder realityIn UUnder markDeviation range in, without adjustment
Heating flow channel structural parameters；If location point UIn realityNot in UIt puts onDeviation range in, and UIn reality> UIt puts on, then it is attached to increase the location point
Spacing between close heating flow channel and mold cavity surface distance and/or increase heating flow channel, if location point UUnder realityNot in UUnder mark's
In deviation range, and UUnder reality< UUnder mark, then reduce heating flow channel and the mold cavity surface distance near the location point and/or reduce and heat
Spacing between runner.
7. a kind of mold, which is characterized in that multiple heating flow channels including type chamber and outside the type chamber, the heating flow channel
Structural parameters determined according to mould preparation method described in one of claim 1-6.
8. a kind of mold heating system, which is characterized in that including high temperature fluid source, the high-temperature stream for exporting the high temperature fluid source
Body is divided into diversion mechanism, mold as claimed in claim 7 and controller at least all the way；
The diversion mechanism includes at least one fluid inlet, selectable multiple fluid outlets, and with the fluid outlet
Multiple first flow regulating valves of corresponding control fluid outlet flow；
One heating flow channel and a fluid outlet pass through piping connection；
The controller carries out process matching to the on-off and flow of the fluid outlet of the diversion mechanism；The high-temperature stream of controller
Body control terminal is electrically connected with the switch terminals in high temperature fluid source, the control of the first valve control terminal and first flow regulating valve of controller
End electrical connection processed.
9. mold heating system as claimed in claim 8, which is characterized in that further include at least one be arranged on the mold
A temperature sensor, the output end of the temperature sensor are electrically connected with the temperature input of controller；
And/or further include the second flow regulating valve being arranged at the fluid inlet, the second valve control terminal of controller with
The control terminal of second flow regulating valve is electrically connected.
10. a kind of quick method for heating and controlling of mold based on mold heating system described in claim 8 or 9, feature exist
In, comprising:
Step A, a plurality of heating for obtaining mold in conjunction with die size, modular construction, raw material thermal physical property parameter and Shooting Technique are bent
Line obtains multiple target heating durations and its corresponding multiple target temperatures；
Step B, according to die size, two or more heating are arranged in modular construction or raw material thermal physical property parameter on mold
Region is that the heating flow channel in heating region distributes fluid outlet；
Step C, cavity structure, the raw material thermal physical property parameter that position, heating region in conjunction with where heating region on mold include
Heating curves is matched, and regional aim temperature is obtained based on the heating curves；
Step D, flow of the controller based on high temperature fluid in heating flow channel in regional aim temperature control heating region；
Step E, unlatching and/or shutdown of the controller based on the time parameter control first flow regulating valve on heating curves；
It or further include temperature information adjusting each heating region of the controller according to the temperature sensor feedback being arranged on mold
In middle heating flow channel the step of the flow of high temperature fluid.
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| CN201910429899.1A Active CN110271158B (en) | 2019-03-12 | 2019-05-22 | Method for acquiring temperature of target area in mold, control method and system |
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| CN113863057B (en) * | 2021-09-03 | 2022-08-02 | 珠海格力电器股份有限公司 | Heating mould |
| CN116651971A (en) * | 2023-08-01 | 2023-08-29 | 苏州利来汽车配件有限公司 | Online detection method and system for automobile stamping die |
| CN116651971B (en) * | 2023-08-01 | 2023-10-24 | 苏州利来汽车配件有限公司 | Online detection method and system for automobile stamping die |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110238995A (en) | 2019-09-17 |
| CN110238995B (en) | 2021-10-22 |
| CN110271158A (en) | 2019-09-24 |
| CN110271158B (en) | 2021-07-23 |
| CN110027139B (en) | 2021-06-22 |
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