CN101648429A - Method for manufacturing plastic mould of automobile door plate loudspeaker mask - Google Patents
Method for manufacturing plastic mould of automobile door plate loudspeaker mask Download PDFInfo
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- CN101648429A CN101648429A CN200910063795A CN200910063795A CN101648429A CN 101648429 A CN101648429 A CN 101648429A CN 200910063795 A CN200910063795 A CN 200910063795A CN 200910063795 A CN200910063795 A CN 200910063795A CN 101648429 A CN101648429 A CN 101648429A
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Abstract
The invention discloses a method for manufacturing a plastic mould of an automobile door plate loudspeaker mask. The method comprises the following steps: (A) selecting a plastic component structure:a left decoration component and a right decoration component of the automobile door plate loudspeaker mask; (B) selecting a mould structure: (a) designing a die cavity of the mould; (b) designing a die core: adopting the following methods: adding a belting pile in a hook shape on the die core; polishing the face of the die cavity before processing the texture; and increasing the thickness of an installation clamping position; (c) designing a parting face and a template; (d) designing a sprue; (e) designing an ejection system; and (f) cooling: cooling and solidifying the plastic components quickly; injecting PP into the die cavity by an injection molding machine, recovering an ejector bar to a position where the mould is closed under the action of a recovery bar and a return spring and completing the mould. The invention has easy method, simple and convenient operation, high strength, high temperature resistance, high accuracy, strong degree of durability, stable performance and good insulation property, reduces a large number of time and expenses consumed by repairing the mould and saves various costs by more than 50% in the design and processing of the mould.
Description
Technical field
The present invention relates to vapour plastic moulds technology field, more specifically relate to a kind of manufacture method of plastic mould of automobile door plate loudspeaker mask, be applicable to the manufacturing of various automobile plastic products.
Background technology
Along with the development of society, plastic products become in people's life a part ofly indispensable with characteristics such as it are light and handy, attractive in appearance, durable, inexpensive.People are also more and more higher to the requirement of plastic part, not only pursue the structural behaviour of plastic, and the surface quality of plastic is also more and more paid attention to.Plastic products occupy quite great proportion in automotive upholstery, plastic part quality is one of key factor that influences automobile appearance image and serviceability, after the design of plastic material and goods and processing technology were determined, the quality of plastic injection mould had decisive role to the quality and the cost of plastic.In the development process of modern manufacturing industry, the status and the importance thereof of mould are subject to people's attention day by day.Therefore the mould design of studying automotive upholstery has great importance, and the present invention has designed automobile door plate loudspeaker mask left and right sides decoration injection molding.
Make automobile door plate loudspeaker mask left and right sides decoration at present and adopt more traditional method to make, product can be produced, but lacks (general 200,000 moulds), the quality instability of product (key is that burr etc. appears in product easily) die life.
Summary of the invention
The objective of the invention is to be to provide a kind of manufacture method of plastic mould of automobile door plate loudspeaker mask, easy to implement the method, easy and simple to handle, this method can make have high strength, high-temperature resistant, high accuracy, strong durability degree, stable performance, electrical property are outstanding, the high-quality plastics product of good insulating, corrosion resistance.And in manufacture process, improved the success rate of a die trial, by advanced person's design concept, provide a kind of good filling form make the moulding of plastic reliable, economical, make the design perfection.Reduced repair a die consume a large amount of time and expense, and without the mould that repairs a die repeatedly, its life-span is also longer.In Mould design and processing, can save every cost 50% with first-class advantage.
In order to realize above-mentioned task, the present invention adopts following technical measures:
Described plastic mould of automobile door plate loudspeaker mask be automobile door plate loudspeaker mask left and right sides decoration, this is the plastic that two left-right symmetry are mirror, for attractive in appearance, the upper surface of decoration is the streamlined curved surface, other each faces are many to be made of curved surface, upper and lower surface model curved surface complexity wherein, bottom also have two the hollow cylinder hole and six roots of sensation that are used to install the location that screens and hexagonal reinforcements are installed.Part total height 30mm, concrete size
180*t3.0 accurately data are seen the part digital-to-analogue.
A kind of manufacture method of plastic mould of automobile door plate loudspeaker mask, its step is as follows:
One, plastic component structure is selected (analysis):
Automobile door plate loudspeaker mask left and right sides decoration, this is the plastic that two left-right symmetry are mirror, for attractive in appearance, the upper surface of decoration is the streamlined curved surface, other each faces are many to be made of curved surface, upper and lower surface model curved surface complexity wherein, bottom also have two the hollow cylinder hole and six roots of sensation that are used to install the location that screens and hexagonal reinforcements are installed.Part total height 30mm, concrete size φ 180*t3.0.
The difficulty of this product maximum is that the front of product has 1950-2050's
The pore of 2mm, the centre
The zone of 114mm is a through hole, and remaining border area is a blind hole, thus its particular structure when causing this formed product product pack tightly cover half easily, be difficult to take out, and the positive texture requirement that requires to have P022 of product, product colour is FAX (ash) and FZL (deceiving), quality requirement is as follows:
The product appearance quality, visible surface weldless trace, nothing scratch; Part does not have contraction, overlap, burr; Do not allow and lack material phenomenon, loudspeaker grid place through hole non-trimming.Texture, color and glossiness meet the standard jig requirement that the client provides.
With the requirement that face difference and gap are arranged after the door-plate installation, the face difference requires 0 ± 1mm, gap 1.5 ± 1mm, the design of cubing is according to the installment state board design of product on door-plate, specifically decompose according to automobile door plate PAF figure, cubing must obtain the approval of automobile main frame maker and could use, in process of production by certain frequency check.
The surface of creating out a part with the method (on CATIA software) of surface modeling is carried out hypostazation to this surface then and is drawn the part entity earlier, again this part entity is carried out mirror image processing and can draw this a pair of left and right sides decoration part.The plastic material selection has the modified polypropylene plastic of good combination property, and it has processing and processability preferably, and the good surface appearance characteristic suitably improves mold temperature and can improve plastic fineness.
Two, mould structure is selected (analysis):
1, the design of mold cavity:
Mould when design, to consider the difficulty of processing of the die cavity of mould earlier, special-shaped curved, and also circular hole reaches 1950-2050, therefore adopted the scheme of whole galvanic corrosion; 3D requirement according to product, earlier with PMMA (lucite) work in-process in the heart face process the model of copper electrode, after model comes out process data is kept, then model is carried out careful check in conjunction with product 3D, the matching measurement in a hole, a hole, appearance curved surface to model, omnibearing measurement inspection such as size, incongruent machining center of going up again improves processing, constantly improves and improves, finally reach 100% uniformity with 3D, the process data of real like this copper electrode has just been finished.
According to global copper electrode of process data processing of model, then with global copper electrode discharge process on die cavity, discharge process needs about 7 day time to finish, and has saved about 13 days than traditional method.
2, the design of core:
Because this position, product hole is extremely many, exists the problem that product packs tightly die cavity, is unfavorable for the production of mass, therefore must after the increase structure makes the product die sinking on the cover half, wrap on the core, so just can enter the production of mass.
For solve product pack tightly die cavity problem we taked following method:
(1) increased the stake of 9 band material on core, be and collude shape, core will be with product along with he moves after the die sinking like this;
(2) before texture is undressed cavity surface is carried out the high accuracy polishing, reach 8 class precisions, this has also reduced the package power of die cavity.
(3) increase by six thickness (be designed to 2mm the earliest, be increased to 2.5mm) that screens are installed, its hot strength is doubled, also increased the strength that product is followed core.
Work on the three areas simultaneously like this, thoroughly solved the problem that product packs tightly die cavity.
The overall dimension of plastic is small-sized, the higher height of dimensional accuracy, and in order to reduce the moulding expense, the design adopts two of moulds.According to the structural analysis of part, die joint is selected in the largest contours place, and top is with two embedded die cavities of solid die, and the bottom is with corresponding punch, the slide block of six installation positions of embedding people again.
3, die joint and template:
Die joint is used for cutting apart workpiece or already present mold volume.It is made up of one or more (general 1) curved surface features.In the mould design cycle of Pro/Engineer, a step most important, most critical is exactly the foundation of die joint.The selection of die joint not only influences the normal moulding and the demoulding of plastic, but also relates to the structure and the manufacturing cost of mould.The selection of die joint should be satisfied after dynamic model separates, and plastic member product is stayed in the dynamic model as far as possible, can utilize the mould emptier on the dynamic model to carry out the demoulding like this, and pickup is convenient.Otherwise, goods are stayed on the cover half, set up mould emptier on the cover half again, make the mould structure complexity.
When setting up die joint, the design sets up die joint to a mould one chamber earlier, segmentation volume piece, mold is carried out in a mould one chamber, and then set up the die joint of two of moulds.In the somatotype process, profile is the most complicated around the integral body of plastic member product, therefore with general classifying method, can not the segmentation volume piece, and can not get total die joint.The design adopts and to select mo(u)lding line to project to workpiece on product, and then projection line stretched passes the product upper surface and become multangular die joint, at last all side die joints is merged.This mould is two layouts of a mould, and therefore last employing border mixed method (design of CATIA software) has been set up the die joint between two, and all die joints merge then, have just set up total die joint.
In process of injection molding, the die cavity of mould will be subjected to the effect of high pressure, so mold cavity should have enough strength and stiffness.Undercapacity will cause plastic deformation, even cracking; Insufficient rigidity will cause strain, cause die cavity outwards to expand, and produce the flash gap.Because the mold cavity size is bigger, big strain before taking place in die cavity, and its internal stress often surpasses allowable stress, therefore tackles die cavity intensity and checks.Because this plastic belongs to medium quantity batch processing, therefore for the ease of processing, reduce die cost, dynamic model and cover half material selection 38CrMoAL steel, the design is after process is checked, fixed half and moving half adopts monolithic construction, and the fixed half and moving half overall dimension distributes and is decided to be 650mmx400mmx300mm and 650mmx400uunx300mm.
What template was selected is Hong Kong standard LKM mould bases, carries out corresponding use according to the requirement of appearance and size, and cover half is the mould parts of moulding plastic profile, and its working size belongs to and contains size, and the wearing and tearing of die in use can make contains size increase gradually.So, in order to make the wearing and tearing of mould leave the leeway that repairs a die, when designing mould, containing size and take off the limit size as far as possible, dimensional tolerance is taken off deviation.Dynamic model also is the core mold part of moulding plastic, and its working size belongs to contained size, and the wearing and tearing of dynamic model in use can make contains size increase gradually.So the needs that repair a die in process of production for plastic when designing mould, contain the size capping size of trying one's best, dimensional tolerance is got the upper deviation.
4, the design of cast gate:
Cast gate is the key component of running gate system, and there is great influence at the form of cast gate, size and the position of offering on plastic to plastic part quality.The main effect of cast gate has two: the one, and the passage that plastic melt is flowed through; The 2nd, in good time solidifying of cast gate can be controlled the dwell time (2 seconds).The cast gate design comprises the selection of determining of cast gate cross sectional shape, cast gate sectional dimension and gate location.Property of raw material that plastic is used such as forming temperature (170 ~ 220 degree), density (0.97 ~ 1.5), shrinkage factor (0.5 ~ 2%) and have non-filler etc. all to have influence on the design of cast gate.In addition, when carrying out the cast gate design, also should consider processing, the demoulding of cast gate and remove the complexity that cast gate coagulates material.
Because side gate generally is opened on the die joint, lateral surface charging from plastic, the cast gate cross sectional shape is simple, easy to process, the vestige that on plastic, stays, and it is good to protect pond moulding, but the loudspeaker mask viewing area does not admit of gate vestiges, so according to the plastic component structure characteristics, the design selects for use side to advance sub marine gate.When determining gate location, cast gate should design in the thickest part of product wall thickness, and make every effort to cast gate to die cavity each several part distance as far as possible near and be beneficial to feeding; Avoid producing injection, in moulding, produce snake stream at the cast gate place; And cast gate should design the main stressed part when product molding.See that figure below can learn, this product is in order to overcome the following accompanying drawing 7 of these problem gate locations, is selected in six of products and installs above wherein two of screens, avoided the defective of product appearance, also is easy to moulding.
5, ejection system design:
Because this product is whole circular approximately, product must not be out of shape, so must guarantee product integral body evenly ejects, the motion that adds the core-pulling device of six screens resets and all has interference, has at first done cae analysis, the course of action of simulation entire die, finally selected for use evenly eject at 6, the large-angle inclined core-pulling device of the six roots of sensation has been avoided the interference of moving, simultaneously
The 114mm area part has adopted adjustable movable part, is beneficial to the Mould Machining exhaust, and reasonable adjusting position is avoided the defective of product appearance.By the check of production practices, this is a perfect cases of design.
6, cooling:
The cooling of mould (mold temperature remain on 80 degree following) be exactly will produce in the process of injection molding and conduction give the heat of mould, should derive as far as possible rapidly and farthest, thereby make plastic with the very fast speed cooling curing of (10 ~ 50 seconds); Be out of shape when preventing the plastic demoulding; Shorten molding cycle, enhance productivity; Increase the degree of supercooling of crystalline plastic, to obtain the good ganoid plastic of overall performance.Therefore, the effect of cooling is directly determining the quality and the production efficiency of plastic.The plastics temperature that generally is expelled in the mould is controlled at 195-205 ℃, and its temperature is controlled at below 60 ℃ when afterwards taking out from mold cavity and plastic solidifies.Thermoplastic must effectively cool off mould after injection moulding, improves plastic typing quality and production efficiency.Cooling medium has cooling water and compressed air, generally uses the many of cooling water, and this is that heat transfer coefficient is big because the thermal capacitance of water is bigger, and cost is low, and the water that is lower than room temperature (20-25 ℃) is also obtained easily.Promptly offering cooling-water duct around the mold cavity or in the die cavity, utilize recirculated water that heat is taken away with water cooling, reduce mold cavity temperature (below 80 ℃).
Cooling System Design should accomplish that flow media can fully absorb the heat that the moulding plastic is conducted in the cooling system, make molding surface temperature stabilization remain in the required temperature range.Therefore, under situation about not interfering with ejection system and other connectors, cooling system is provided with near die cavity as far as possible.According to the complex structure degree of plastic, cooling water channel can adopt through type and swinging.The through type channel structure is simple, and is easy to process, but cooling effect is general.The path of swinging water channel is pressed close to and the die cavity profile more, and cooling effect is better, but the processing cost height also must adopt split-type structural sometimes.Because the trim volume is little, complex-shaped degree is not high, and therefore for cutting down finished cost, the design adopts the through type cooling water channel, and the flow that overregulates cooling water can be controlled the heat that cooling system distributes, thereby regulates the temperature of mold cavity.
After the mold work process mould closure, injection machine begins to annotate people PP in die cavity, then after pressurize moulding after a while, dynamic model begins to separate with cover half with injection machine, when treating that dynamic model is opened to the final position, under the effect of effect of drawing material to collude and core package power, plastic is stayed on the dynamic model with the material that coagulates in flowing, under the effect of ejecting mechanism, plastic is separated from dynamic model, under the effect of release link and back-moving spring, the position at place when push rod is returned to the mould closure, last mould closure, so far, mould has been finished a working cycles.
The present invention compared with prior art has following advantage and effect:
1) this project can design for goods, mould designs, the whole process of production of injection mo(u)lding provides total solution.The MPA of CAE (products perfection consultant) is based on the injection mould analysis software of entity, can accept from the solid modelling of any CAD software output, by sunykatuib analysis, the product design scheme that just can be optimized in very short time is confirmed surface quality of products; MPI (simulation of injection molding analysis) can carry out sunykatuib analysis to whole injection molding process on computers, comprises the auxilliary and thermosetting plastics flow analysis of filling, pressurize, cooling, warpage, fiber orientation, structural stress and contraction, gas; MPX (injection molding process control) can directly link to each other with controller of plastic injection molding, carries out process optimization and quality monitoring in real time.This project is compared similar technology, and operational design is better, has high strength to making, high-temperature resistant, high accuracy, strong durability degree, stable performance, electrical property are outstanding, the high-quality plastics product of good insulating, corrosion resistance provides condition.
2) this project improves the success rate of a die trial.By before Mould Machining, on computers whole injection molding process is carried out sunykatuib analysis, accurately predict filling, pressurize, the cooling situation of plastic melt, and the stress distribution in the goods, molecule and fiber distribution of orientations, situations such as the contraction of goods and buckling deformation, so that can pinpoint the problems as early as possible, the design of time update product and mould is compared other technologies and will be waited until that die trial overhauls mould later on again.Reduce and to avoid mould to overhaul scrapping, improve quality of item, to reduce cost.
3) this project provides a kind of good filling form by advanced design concept, compares other injection mo(u)ldings, can better control the mode of filling, makes the moulding of plastic reliable, economical, and has improved the unidirectional and stable orientation of plastic interior molecules simultaneously.
4) this project is passed through optimal design, the mould design of comparing other various factors of often will thinking over, electronic analysis by this project, can successfully design the flow passage system of pressure balance, temperature balance or pressure, the equal balance of temperature, also can assess, so just can avoid the degraded and the interior too high melt temperature of die cavity of material shear rate in the runner and frictional heat; And shortening molding cycle thus, the internal stress after the minimizing formed product makes the design perfection.
5) use the mould designing technique of this project to combine with existing Shooting Technique technology, reduce die trial repeatedly, repair a die and consume a large amount of time and moneys, in addition, without the mould that repairs a die repeatedly, its life-span is also longer.In Mould design and processing, can save every cost more than 50%.
Description of drawings
Fig. 1 automobile door plate loudspeaker mask left side/right decoration
Fig. 2 copper electrode plastic pattern
Fig. 3 global copper electrode
Fig. 4 mold cavity
Fig. 5 product schematic rear view
Fig. 6 band material colludes schematic diagram
Fig. 7 die joint
Fig. 8 standard LKM mould bases
Fig. 9 runner and gate location
The specific embodiment
The present invention is further described below in conjunction with accompanying drawing, helping understanding the present invention, but do not limit content of the present invention.
A kind of manufacture method of plastic mould of automobile door plate loudspeaker mask, its step is as follows:
1, plastic component structure is selected (analysis):
Automobile door plate loudspeaker mask left and right sides decoration, this is the plastic that two left-right symmetry are mirror, for attractive in appearance, the upper surface of decoration is the streamlined curved surface, other each faces are many to be made of curved surface, upper and lower surface model curved surface complexity wherein, bottom also have two the hollow cylinder hole and six roots of sensation that are used to install the location that screens and hexagonal reinforcements are installed.Part total height 30mm, concrete size
180*t3.0 accurately data are seen the part digital-to-analogue.
The difficulty of this product maximum is that the front of product has about 2000
The pore of 2mm, the centre
The zone of 114mm is a through hole, remaining border area is a blind hole, thus its particular structure when causing this formed product product pack tightly cover half easily, be difficult to take out, and the positive texture requirement that requires to have P022 of product, product colour is that FAX (ash) and FZL (deceiving) quality requirement are as follows:
(1) product appearance quality: visible surface weldless trace, nothing scratch; Part does not have contraction, overlap, burr; Do not allow and lack material phenomenon, loudspeaker grid place through hole non-trimming;
(2) texture, color and glossiness meet the standard jig requirement that the client provides;
(3) requirement in face difference and gap is arranged after installing with door-plate, the face difference requires 0 ± 1mm, gap 1.5 ± 1mm.
The surface of creating out a part with the method for surface modeling is carried out hypostazation to this surface then and is drawn the part entity earlier, again this part entity is carried out mirror image processing and can draw this a pair of left and right sides decoration part.The plastic material selection has the modified polypropylene plastic of good combination property, and it has processing and processability preferably, and the good surface appearance characteristic suitably improves mold temperature and can improve plastic fineness.Concrete material trademark is PPPNO-S07.
2, mould structure is selected (analysis)
The design of A, mold cavity: mould when design, to consider the difficulty of processing of the die cavity of mould earlier, special-shaped curved, and also circular hole reaches 2000, so we have adopted the scheme of whole galvanic corrosion; 3D requirement according to product, earlier with PMMA (lucite) work in-process in the heart face process the model of copper electrode, after model comes out process data is kept, then model is carried out careful check in conjunction with product 3D, the matching measurement in a hole, a hole, appearance curved surface to model, omnibearing measurement inspection such as size, incongruent machining center of going up again improves processing, constantly improves and improves, finally reach 100% uniformity with 3D, the process data of real like this copper electrode has just been finished.Global copper electrode of process data processing according to model then with global copper electrode discharge process on die cavity, needs 7 day time to finish, and has saved about 13 days than traditional method.
The design of B, core
Because this position, product hole is extremely many, exists the problem that product packs tightly die cavity, is unfavorable for the production of mass, therefore must after the increase structure makes the product die sinking on the cover half, wrap on the core, so just can enter the production of mass.
For solve product pack tightly die cavity problem we taked following method:
1, increased the stake of 9 band material on core, be and collude shape, core will be with product along with he moves after the die sinking like this;
2, before texture is undressed cavity surface is carried out the high accuracy polishing, reach 8 class precisions, this has also reduced the package power of die cavity;
3, increase by six thickness that screens are installed, its hot strength is doubled, also increased the strength that product is followed core.
Work on the three areas simultaneously like this, thoroughly solved the problem that product packs tightly die cavity.
The overall dimension of plastic is small-sized, the higher height of dimensional accuracy, and in order to reduce the moulding expense, the design adopts two of moulds.According to the structural analysis of part, die joint is selected in the largest contours place, and top is with two embedded die cavities of solid die, and the bottom is with corresponding punch, the slide block of six installation positions of embedding people again.
C, die joint and template
Die joint is used for cutting apart workpiece or already present mold volume.It is made up of one or more curved surface features.In the mould design cycle of Pro/Engineer, a step most important, most critical is exactly the foundation of die joint.The selection of die joint not only influences the normal moulding and the demoulding of plastic, but also relates to the structure and the manufacturing cost of mould.The selection of die joint should be satisfied after dynamic model separates, and plastic member product is stayed in the dynamic model as far as possible, can utilize the mould emptier on the dynamic model to carry out the demoulding like this, and pickup is convenient.Otherwise, goods are stayed on the cover half, set up mould emptier on the cover half again, make the mould structure complexity.
When setting up die joint, the design sets up die joint to a mould one chamber earlier, segmentation volume piece, mold is carried out in a mould one chamber, and then set up the die joint of two of moulds.In the somatotype process, profile is the most complicated around the integral body of plastic member product, therefore with general classifying method, can not the segmentation volume piece, and can not get total die joint.The design adopts and to select mo(u)lding line to project to workpiece on product, and then projection line stretched passes the product upper surface and become multangular die joint, at last all side die joints is merged.This mould is two layouts of a mould, and therefore last employing border mixed method has been set up the die joint between two, and all die joints merge then, have just set up total somatotype.
In process of injection molding, the die cavity of mould will be subjected to the effect of high pressure, so mold cavity should have enough strength and stiffness.Undercapacity will cause plastic deformation, even cracking; Insufficient rigidity will cause strain, cause die cavity outwards to expand, and produce the flash gap.Because the mold cavity size is bigger, big strain before taking place in die cavity, and its internal stress often surpasses allowable stress, therefore tackles die cavity intensity and checks.Because this plastic belongs to medium quantity batch processing, therefore for the ease of processing, reduce die cost, dynamic model and cover half material selection 38CrMoAL steel, the design is after process is checked, fixed half and moving half adopts monolithic construction, and the fixed half and moving half overall dimension distributes and is decided to be 650mmx400mmx300mm and 650mmx400uunx300mm.We select template is Hong Kong standard LKM mould bases, carry out correspondence according to the requirement of appearance and size.
Cover half is the mould parts of moulding plastic profile, and its working size belongs to and contains size, and the wearing and tearing of die in use can make contains size increase gradually.So, in order to make the wearing and tearing of mould leave the leeway that repairs a die, when designing mould, containing size and take off the limit size as far as possible, dimensional tolerance is taken off deviation.Dynamic model also is the core mold part of moulding plastic, and its working size belongs to contained size, and the wearing and tearing of dynamic model in use can make contains size increase gradually.So the needs that repair a die in process of production for plastic when designing mould, contain the size capping size of trying one's best, dimensional tolerance is got the upper deviation.
The design of D, cast gate
Cast gate is the key component of running gate system, the form of cast gate, and size, and there is great influence at the position of offering on plastic to plastic part quality.
Cast gate commonly used generally has following several (specifically not giving unnecessary details)
1. drop gate
2. side gate
3. fan gate
4. some cast gate
5. sub marine gate
6. pawl type cast gate
7. earflap type cast gate
Each channel size reference table
| The position | The long L/cm of runner | The runner radius | Each section length overall | |
| Sprue | ??5 | ??0.315 | ??5 | |
| Runner one | ??13 | ??0.4 | ??26 | |
| Runner two | ??7.5 | ??0.3 | ??30 | |
| Runner three | ??2.5 | ??0.25 | ??20 | |
| Cast gate | ??0.12 | ??0.04 | Disregard |
The main effect of cast gate has two: the one, and the passage that plastic melt is flowed through; The 2nd, in good time solidifying of cast gate can be controlled the dwell time (1-5 second).The cast gate design comprises the selection of determining of cast gate cross sectional shape, cast gate sectional dimension and gate location.Property of raw material that plastic is used such as forming temperature (the forming temperature difference of different plastic raw materials is generally in the 170-300 scope), density, shrinkage factor and have non-filler etc. all to have influence on the design of cast gate.In addition, when carrying out the cast gate design, also should consider processing, the demoulding of cast gate and remove the complexity that cast gate coagulates material.
Because side gate generally is opened on the die joint, lateral surface charging from plastic, the cast gate cross sectional shape is simple, easy to process, the vestige that on plastic, stays, and it is good to protect pond moulding, but the loudspeaker mask viewing area does not admit of gate vestiges, so according to the plastic component structure characteristics, the design selects for use side to advance sub marine gate.When determining gate location, cast gate should design at the thickest part of product wall thickness (general 5-10mm), and make every effort to cast gate to die cavity each several part distance as far as possible near and be beneficial to feeding; Avoid producing injection, in moulding, produce snake stream at the cast gate place; And cast gate should design the main stressed part when product molding.See that figure below (Fig. 9) can learn, this product is in order to overcome these problem gate locations, is selected in six of products and installs above wherein two of screens, avoided the defective of product appearance, also is easy to moulding.
E, ejection system
Because this product is whole circular approximately, product must not be out of shape, so must guarantee product integral body evenly ejects, the motion that adds the core-pulling device of six screens resets and all has interference, so at first done cae analysis, the course of action of simulation entire die, finally selected for use evenly eject at 6, six roots of sensation wide-angle (generally being 45 degree) is core-pulling device tiltedly, has avoided the interference of action, simultaneously
The 114mm area part has adopted adjustable movable part, is beneficial to the Mould Machining exhaust, and reasonable adjusting position is avoided the defective of product appearance.By the check of production practices, this is a perfect cases of design.
F, cooling system:
The cooling of mould is exactly a heat of the also conduction that produces in the process of injection molding being given mould, also derivation farthest as far as possible rapidly, thus make plastic with the fast speeds cooling curing; Be out of shape when preventing the plastic demoulding; Shorten molding cycle, enhance productivity; Increase the degree of supercooling (mold temperature remains on below 80 ℃) of crystalline plastic, to obtain the good ganoid plastic of overall performance.Therefore, the effect of cooling is directly determining the quality and the production efficiency of plastic.The plastics temperature that generally is expelled in the mould is about 200 ℃, and plastic solidify the back when from mold cavity, taking out its temperature below 60 ℃.Thermoplastic must effectively cool off (50-80 ℃) to mould after injection moulding, improve plastic typing quality and production efficiency.Cooling medium has cooling water (cooling water is 23 ℃ of normal temperature) and compressed air (pressure is at 8-15bar), generally use the many of cooling water, this is because the thermal capacitance of water is bigger, heat transfer coefficient big (generally being 1000-2500K), cost is low, and the water that is lower than room temperature is also obtained easily.Promptly offering cooling-water duct around the mold cavity or in the die cavity, utilize recirculated water that heat is taken away with water cooling, reduce mold cavity temperature (temperature is controlled at below 80 ℃).
Cooling System Design should accomplish that flow media can fully absorb the heat that the moulding plastic is conducted in the cooling system, make molding surface temperature stabilization remain in required temperature model (temperature is controlled at below 80 ℃) encloses.Therefore, under situation about not interfering with ejection system and other connectors, cooling system is provided with near die cavity as far as possible.According to the complex structure degree of plastic, cooling water channel can adopt through type and swinging.The through type channel structure is simple, and is easy to process, but cooling effect is general.The path of swinging water channel is pressed close to and the die cavity profile more, and cooling effect is better, but the processing cost height also must adopt split-type structural sometimes.Because the trim volume is little, complex-shaped degree is not high, and therefore for cutting down finished cost, the design adopts the through type cooling water channel, and the cooling water channel of dynamic model and cover half is arranged.Can control the heat that cooling system distributes by the flow of regulating cooling water, thereby regulate the temperature (it is following that temperature is controlled at 80 degree) of mold cavity.
4, mold work process:
After the mould closure, injection machine begins to inject PP in die cavity, then through after a while after the pressurize moulding of (2-8 second), dynamic model begins to separate with cover half with injection machine, when treating that dynamic model is opened to the final position, under the effect of effect of drawing material to collude and core package power, plastic is stayed on the dynamic model with the material that coagulates in flowing, under the effect of ejecting mechanism, plastic is separated from dynamic model, under the effect of release link and back-moving spring, the position at place when push rod is returned to the mould closure, last mould closure, so far, mould has been finished a working cycles.
Claims (1)
1, a kind of manufacture method of plastic mould of automobile door plate loudspeaker mask, its step is as follows:
A, plastic component structure are selected:
Automobile door plate loudspeaker mask left and right sides decoration, left-right symmetry is the plastic of mirror, the upper surface of decoration is the streamlined curved surface, other each faces are many to be made of curved surface, upper and lower surface model curved surface wherein, the bottom is used to install the hollow cylinder hole and the six roots of sensation of location screens and a hexagonal reinforcement is installed, and has 1950-2050 in the product front
The hole of 2mm, the centre
The zone of 114mm is a through hole, and remaining border area is a blind hole; The surface of creating out a part with the method for surface modeling is carried out hypostazation to this surface and is drawn the part entity earlier, again this part entity is carried out mirror image processing and draws a pair of left and right sides decoration part;
B, mould structure are selected:
The design of a, mold cavity:
During the mould design, the processing of mould, special-shaped curved, circular hole reaches 1950-2050, adopts the scheme of whole galvanic corrosion; Earlier with the PMMA work in-process in the heart face process the model of copper electrode, model comes out then process data to be preserved, and model is tested in conjunction with product 3D; According to global copper electrode of process data processing of model, then with global copper electrode discharge process on die cavity;
The design of b, core:
Position, product hole is many, exists product and packs tightly die cavity, wraps on the core after the increase structure makes the product die sinking on the cover half, takes following method:
(1) increased the stake of 9 band material on core, be and collude shape, core will be with product along with moving after the die sinking;
(2) before texture is undressed, cavity surface is polished, reach 8 class precisions, reduced the package power of die cavity;
(3) increase by six thickness that screens are installed, its hot strength is doubled, increased the strength that product is followed core; Adopt two of moulds, die joint is selected in the profile place, and top is with two embedded die cavities of solid die, and the bottom embeds the slide block of six installation positions again with corresponding punch;
C, die joint and template:
Die joint is to be used for cutting apart workpiece, and it is made up of a curved surface, in the mould design cycle of Pro/Engineer, after being chosen in dynamic model and separating of die joint, plastic member product is stayed in the dynamic model, utilizes the mould emptier on the dynamic model to carry out the demoulding; When setting up die joint, design a mould one chamber and set up die joint, segmentation volume piece, mold are carried out in one mould, one chamber, set up the die joint of two of moulds again, select mo(u)lding line to project to workpiece, again projection line is stretched and pass the product upper surface and become multangular die joint, at last all side die joints are merged, this mould is two layouts of a mould, adopts the border mixed method to set up die joint between two at last, all die joints merge, and have set up total die joint;
The design of d, cast gate:
Cast gate is a running gate system, the form of cast gate, size and on plastic, offer the position, and cast gate has two: the one, the passage that plastic melt is flowed through; The 2nd, the dwell time is controlled in solidifying of cast gate; Cast gate design comprises the selection of determining of cast gate cross sectional shape, cast gate sectional dimension and gate location, 170-300 ℃ of property of raw material forming temperature, density 0.97-1.5, the shrinkage factor 0.5-2% that plastic the is used and design of non-filler to cast gate arranged;
E, ejection system design:
Product is a unitary circular, and product must not be out of shape, and product integral body evenly ejects, and selects for use evenly eject at 6, the large-angle inclined core-pulling device of the six roots of sensation;
F, cooling:
The cooling of mould is exactly a heat of the also conduction that produces in the process of injection molding being given mould, makes the speed cooling curing of plastic; Be out of shape when preventing the plastic demoulding; Shorten molding cycle, enhance productivity; Increase the degree of supercooling of crystalline plastic, obtain the smooth plastic of overall performance, the plastics temperature that is expelled in the mould is controlled at 195-205 ℃, its temperature is controlled at below 60 ℃ when taking out from mold cavity after plastic solidifies, and thermoplastic cools off mould after injection moulding, cooling medium has cooling water and compressed air, promptly offering cooling-water duct around the mold cavity or in the die cavity, utilize recirculated water that heat is taken away with water cooling, reduce the mold cavity temperature below 80 ℃; After the mold work process mould closure, injection machine begins to annotate people PP in die cavity, after passing through the 2-8 pressurize moulding of second then, dynamic model begins to separate with cover half with injection machine, when treating that dynamic model is opened to the final position, under the effect of effect of drawing material to collude and core package power, plastic is stayed on the dynamic model with the material that coagulates in flowing, under the effect of ejecting mechanism, plastic is separated from dynamic model, under the effect of release link and back-moving spring, and the position at place when push rod is returned to the mould closure, last mould closure, mould is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910063795A CN101648429A (en) | 2009-09-03 | 2009-09-03 | Method for manufacturing plastic mould of automobile door plate loudspeaker mask |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910063795A CN101648429A (en) | 2009-09-03 | 2009-09-03 | Method for manufacturing plastic mould of automobile door plate loudspeaker mask |
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| CN101648429A true CN101648429A (en) | 2010-02-17 |
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| CN200910063795A Pending CN101648429A (en) | 2009-09-03 | 2009-09-03 | Method for manufacturing plastic mould of automobile door plate loudspeaker mask |
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| CN103433380A (en) * | 2013-08-02 | 2013-12-11 | 龚志辉 | Raised forming method of drawing mould of automobile panel |
| CN104400968A (en) * | 2014-11-19 | 2015-03-11 | 滁州市精华模具制造有限公司 | Injection mould core for refrigerator fan frame |
| CN104669515A (en) * | 2013-11-30 | 2015-06-03 | 深圳富泰宏精密工业有限公司 | Preparation method of plastic shell and plastic shell prepared by method |
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| CN103433380A (en) * | 2013-08-02 | 2013-12-11 | 龚志辉 | Raised forming method of drawing mould of automobile panel |
| CN104669515A (en) * | 2013-11-30 | 2015-06-03 | 深圳富泰宏精密工业有限公司 | Preparation method of plastic shell and plastic shell prepared by method |
| CN104400968A (en) * | 2014-11-19 | 2015-03-11 | 滁州市精华模具制造有限公司 | Injection mould core for refrigerator fan frame |
| CN104985782A (en) * | 2015-07-07 | 2015-10-21 | 安徽华胤家具有限公司 | Machining technology for chair plastic armrest |
| CN107925807A (en) * | 2015-08-24 | 2018-04-17 | 雅马哈株式会社 | Grid and acoustic apparatus |
| US11006194B2 (en) | 2015-08-24 | 2021-05-11 | Yamaha Corporation | Grille and acoustic device |
| CN105690650A (en) * | 2016-03-11 | 2016-06-22 | 佛山市顺德区百年科技有限公司 | Injection molding method of product |
| CN106182508A (en) * | 2016-07-12 | 2016-12-07 | 深圳市宝鸿精密模具股份有限公司 | A kind of identical product multi-point mould method for designing |
| CN108127866A (en) * | 2017-12-19 | 2018-06-08 | 长春富维安道拓汽车饰件系统有限公司 | The integrated auxiliary automobile door plate forming method with loudspeaker net pore structure of gas |
| CN113275849A (en) * | 2021-06-24 | 2021-08-20 | 北京嘉诚兴业工贸股份有限公司 | Machining process of automobile horn mesh injection mold |
| CN113275849B (en) * | 2021-06-24 | 2023-02-17 | 北京嘉诚兴业工贸股份有限公司 | Machining process of automobile speaker mesh surface injection mold |
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Open date: 20100217 |