CN118106443A - Composite modeling method of automobile panel stamping die - Google Patents
Composite modeling method of automobile panel stamping die Download PDFInfo
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- CN118106443A CN118106443A CN202410099618.1A CN202410099618A CN118106443A CN 118106443 A CN118106443 A CN 118106443A CN 202410099618 A CN202410099618 A CN 202410099618A CN 118106443 A CN118106443 A CN 118106443A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 96
- 238000000465 moulding Methods 0.000 claims abstract description 55
- 244000035744 Hura crepitans Species 0.000 claims abstract description 48
- 239000011347 resin Substances 0.000 claims abstract description 38
- 229920005989 resin Polymers 0.000 claims abstract description 38
- 238000005266 casting Methods 0.000 claims abstract description 32
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000003110 molding sand Substances 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 13
- 239000003973 paint Substances 0.000 claims abstract description 11
- 238000013461 design Methods 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 230000001680 brushing effect Effects 0.000 claims abstract description 5
- 238000007766 curtain coating Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000006260 foam Substances 0.000 claims description 47
- 238000005520 cutting process Methods 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 9
- 239000006261 foam material Substances 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 230000007547 defect Effects 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- 238000010115 full-mold casting Methods 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 229920006327 polystyrene foam Polymers 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 abstract description 2
- 238000005056 compaction Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Abstract
The application relates to the technical field of mould modeling, in particular to a composite modeling method of an automobile panel stamping mould, which comprises the steps of mould making, casting process design, curtain coating, modeling, smelting, cooling and casting shakeout, wherein the modeling step comprises the steps of placing direct conformal chill at a corresponding position of a molded surface, and brushing the paint; setting an inner pouring gate, a cross pouring gate and a straight pouring gate according to a molding process, after the direct conformal chill periphery brushing coating is dried, sleeving a sand box on a mold, starting resin sand mixing and starting sand burying molding, placing a sand separating chill at a position where the sand separating chill needs to be arranged, burying a molded surface tightly, scraping molding sand on the surface of the sand box, and standing for curing the resin sand. Compared with the prior art, the application solves the problems of low molding efficiency and high cost of the stamping die for the automobile panel in the prior art.
Description
Technical Field
The invention relates to the technical field of mold modeling, in particular to a composite modeling method of an automobile panel stamping mold.
Background
The automobile panel die structure mainly comprises a lightening hole formed by a molded surface for molding the panel shape and a rib plate for supporting the molded surface on the bottom surface. At present, the production of automobile panel mainly adopts full mold casting, namely foam plates are processed through numerical control programming, a foam model of a mold is formed after splicing, then the foam model is coated with paint, dried and cast, a casting process is designed, a casting system is connected on a molding platform, the position of a molded surface is covered on the foam model by using direct conformal chill or sand-insulating chill is arranged on the molded surface, so that the defects of shrinkage porosity, pocking mark and the like do not occur in the subsequent molding surface processing of castings; and after the molding surface is molded, the sand box turns over to perform bottom surface sand burying, and is hung to a pouring area after sand burying is finished, and a negative pressure pipeline is connected to wait for pouring.
The resin sand technology is adopted when the stamping die is molded in the full mold casting production, resin and curing agent are consumed, the fluidity of the resin sand is poorer than that of the dry sand, if the molding sand is not compacted when the molding sand is buried in the molding die, sand sticking defects can be formed after casting, and in order to tamp the molding sand, the surface of the molding die is often crushed by using tools such as a tamping rod to form the defects. In order to save cost and improve competitiveness, more and more products are cast by lost foam instead of solid resin sand, lost foam is filled with dry sand, compaction is carried out through a compaction table, the molding efficiency is high, the cost of a resin curing agent is saved, but direct conformal chill and sand-blocking chill cannot be placed on the surface of a model, because the molding sand is compacted through the compaction table, if the chill is placed, and the compaction table is opened, the chill can shift and cannot reach the expected effect, therefore, the application discloses a composite molding method of an automobile covering part stamping die, the molding efficiency is improved while the processing quality of the stamping die is ensured, and the molding cost is reduced.
Disclosure of Invention
Therefore, the invention aims to provide a composite molding method of an automobile panel stamping die, which aims to solve the problems of low molding efficiency and high cost of the automobile panel stamping die in the prior art.
Based on the above object, the invention provides a composite modeling method of an automobile panel stamping die, comprising the following steps:
s1, model manufacturing: manufacturing a foam model according to drawing requirements;
S2, designing a casting process: setting a casting process according to full mold casting, sticking an inner pouring gate on a model, and conveying to-be-curtain coating drying rooms after model inspection;
S3, spray coating: coating the coating according to the conventional Baume requirement, drying, wherein the thickness of the coating after drying is not less than 1.5mm, and reinforcing the model according to the requirement after drying, so as to improve the compression deformation resistance of the model;
S4, modeling: molding the surface on a molding platform by using resin sand;
s5, smelting: controlling the temperature of molten iron according to the required casting temperature, connecting an extraction opening of a dry sand negative pressure sand box with a vacuum pump before casting, starting the vacuum pump, and casting when the negative pressure is controlled to be 0.05-0.06 MPa;
s6, cooling: s5, after vacuum pressure maintaining, starting a cooling system to cool the sand box;
s7, casting shakeout: and separating the molding sand and the casting, and cutting the casting head system to complete the composite molding process of the automobile panel stamping die.
Preferably, the modeling in the step S1 includes the following steps:
obtaining a drawing: firstly, obtaining a design drawing or a three-dimensional model of a product;
Preparing a foam material: selecting proper foam materials, including polystyrene and polyurethane foam, wherein the materials have uniform texture and smooth surface and meet the requirements of products;
cutting the foam block: cutting the foam material into a block foam model raw material with a corresponding size by using a hot wire cutting machine or a numerical control cutting device according to the size and the shape of the product;
Rough cutting and finishing: rough cutting and trimming are carried out on the foam blocks, and the appearance of the product is roughly cut out on the foam blocks according to the contour line of the product, so that the foam blocks gradually approach the shape required by design;
And (3) manual adjustment: the foam model is manually adjusted by using a plane and sand paper tool, so that the accuracy of the contour and the curved surface of the product is improved;
Surface treatment: performing surface treatment, including polishing, filling and repairing processes, for improving the surface evenness of the foam model and eliminating obvious flaws and defects;
and (3) manufacturing a matched die: combining a foam model with a mould manufacturing process, and spraying coating materials, including resin and paint, on the surface of the foam model to increase the strength and wear resistance of the model;
and (3) checking: and checking the manufactured foam model to ensure that the size, shape and surface quality of the foam model meet the design requirements.
Preferably, the step of S4 modeling includes the following steps:
placing the direct conformal chill at the corresponding position of the molded surface, and brushing the paint;
And (3) arranging an inner pouring gate, a cross pouring gate and a straight pouring gate according to a molding process, and sleeving the sand box on the model after the paint is directly brushed on the periphery of the conformal chill and dried.
Preferably, when the sand box is placed on a model, sand feeding amount in all directions is controlled to be not smaller than 120mm, resin sand mixing is started, sand-isolation chill is placed at a position where the sand-isolation chill is required to be arranged, the sand-isolation thickness is 15mm-25mm, after the molded surface is tightly buried, molding sand on the surface of the sand box is scraped, the sand box is left to stand until the resin sand is solidified, after 2.5-3.5 hours, the resin sand is completely solidified, and the sand box is turned over.
Preferably, the step of S4 modeling further comprises the following operation steps:
Preparing a dry sand negative pressure sand box, placing dry sand with the thickness of 150mm on the bottom surface of the sand box, starting vibration to tap and strickle the dry sand, placing the whole sand box manufactured by resin sand into the dry sand negative pressure sand box, inserting foam rods with the same diameter into a sprue as positioning pins, connecting a sprue ceramic pipe at an exposed section, adding the bottom surface of dry sand buried in the sand box and the periphery of the sand box, starting vibration for 30s every 150mm of the thickness of the sand, burying the whole resin sand in the dry sand negative pressure sand box, compacting and strickling the resin sand.
Preferably, the step of S4 modeling further comprises the following operation steps:
spreading a layer of plastic cloth on the surface of the dry sand, then placing the dry sand with the thickness of 50-100 mm on the plastic cloth, placing a pouring cup at the top end of the sprue, and piling up the periphery of the pouring cup with sand to avoid the pouring cup from moving.
Preferably, the pouring speed of the molten iron obtained in the S5 smelting step is in accordance with the principle of 'slow before fast and then slow', and the vacuum dwell time after pouring is over is not less than 1h.
The invention has the beneficial effects that: according to the composite molding method of the automobile panel stamping die, various chill is required to be arranged on the molded surface, so that resin sand is used for molding, after the molded surface and a pouring system are buried together with resin sand, after molding sand is solidified, the sand mold is turned over, the turned sand mold is integrally placed into a negative pressure sand box to form a bottom surface, the bottom surface is a lightening hole formed by connecting rib plates, the structure is transparent, the composite molding method is very suitable for filling and compaction of dry sand, a sprue is buried in the negative pressure sand box and connected with the bottom surface, plastic cloth is covered, a pouring cup is placed, pouring is carried out under the condition of negative pressure pumping, molding efficiency is improved while processing quality of the stamping die is guaranteed, and molding cost is reduced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the process flow of the present invention.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As shown in fig. 1, the composite molding method of the automobile panel stamping die comprises the following steps:
s1, model manufacturing: manufacturing a foam model according to drawing requirements;
S2, designing a casting process: setting a casting process according to full mold casting, sticking an inner pouring gate on a model, and conveying to-be-curtain coating drying rooms after model inspection;
S3, spray coating: coating the coating according to the conventional Baume requirement, drying, wherein the thickness of the coating after drying is not less than 1.5mm, and reinforcing the model according to the requirement after drying, so as to improve the compression deformation resistance of the model;
S4, modeling: molding the surface on a molding platform by using resin sand;
s5, smelting: controlling the temperature of molten iron according to the required casting temperature, connecting an extraction opening of a dry sand negative pressure sand box with a vacuum pump before casting, starting the vacuum pump, and casting when the negative pressure is controlled to be 0.05-0.06 MPa;
s6, cooling: s5, after vacuum pressure maintaining, starting a cooling system to cool the sand box;
s7, casting shakeout: and separating the molding sand and the casting, and cutting the casting head system to complete the composite molding process of the automobile panel stamping die.
When the process modeling automobile panel stamping die is adopted, various chill is required to be arranged on the molded surface, so that resin sand is used for molding, after the molded surface and a pouring system are buried together by the resin sand, the molding sand is turned over after being solidified, the turned sand mold is integrally placed in a negative pressure sand box to form a bottom surface, the bottom surface is a lightening hole formed by connecting rib plates, the structure is transparent, the process modeling automobile panel stamping die is very suitable for dry sand filling and compaction, a sprue is buried in the negative pressure sand box and connected with the bottom surface, plastic cloth is covered, a pouring cup is placed, pouring is performed under the condition of negative pressure pumping, the molding efficiency is improved while the processing quality of the stamping die is ensured through solid resin sand molding and dry sand lost foam composite molding, and the molding cost is reduced.
Further, referring to fig. 1, the modeling in step S1 includes the following steps:
obtaining a drawing: firstly, obtaining a design drawing or a three-dimensional model of a product;
Preparing a foam material: selecting proper foam materials, including polystyrene and polyurethane foam, wherein the materials have uniform texture and smooth surface and meet the requirements of products;
cutting the foam block: cutting the foam material into a block foam model raw material with a corresponding size by using a hot wire cutting machine or a numerical control cutting device according to the size and the shape of the product;
Rough cutting and finishing: rough cutting and trimming are carried out on the foam blocks, and the appearance of the product is roughly cut out on the foam blocks according to the contour line of the product, so that the foam blocks gradually approach the shape required by design;
And (3) manual adjustment: the foam model is manually adjusted by using a plane and sand paper tool, so that the accuracy of the contour and the curved surface of the product is improved;
Surface treatment: performing surface treatment, including polishing, filling and repairing processes, for improving the surface evenness of the foam model and eliminating obvious flaws and defects;
and (3) manufacturing a matched die: combining a foam model with a mould manufacturing process, and spraying coating materials, including resin and paint, on the surface of the foam model to increase the strength and wear resistance of the model;
and (3) checking: and checking the manufactured foam model to ensure that the size, shape and surface quality of the foam model meet the design requirements.
The S4 modeling step comprises the following operation steps:
placing the direct conformal chill at the corresponding position of the molded surface, and brushing the paint;
And (3) arranging an inner pouring gate, a cross pouring gate and a straight pouring gate according to a molding process, and sleeving the sand box on the model after the paint is directly brushed on the periphery of the conformal chill and dried. When the sand box is placed on a model, controlling the sand feeding amount in all directions to be not less than 120mm thick, starting resin sand mixing and starting sand burying molding, placing a sand separating chill at a position where the sand separating chill needs to be arranged, wherein the sand separating thickness is 15-25 mm, after the molded surface is buried tightly, scraping the molding sand on the surface of the sand box, standing for curing the resin sand, and after 2.5-3.5 hours, completely curing the resin sand, and turning over the sand box; preparing a dry sand negative pressure sand box, placing dry sand with the thickness of 150mm on the bottom surface of the sand box, starting vibration to tap and strickle the dry sand, placing the whole sand box manufactured by resin sand into the dry sand negative pressure sand box, inserting foam rods with the same diameter into a sprue as positioning pins, connecting a sprue ceramic pipe at an exposed section, adding the bottom surface of dry sand burying and the periphery of the sand box, starting vibration for 30s every 150mm of the thickness of the dry sand burying bottom surface of the dry sand burying, and vibrating and strickling the resin sand mould; spreading a layer of plastic cloth on the surface of the dry sand, then placing the dry sand with the thickness of 50-100 mm on the plastic cloth, placing a pouring cup at the top end of the sprue, and piling up the periphery of the pouring cup with sand to avoid the pouring cup from moving.
And S5, the pouring speed of molten iron in the smelting step is required to follow the principle of 'slow first, fast second and slow second', and the vacuum pressure maintaining time after the pouring is finished is not less than 1h.
Wherein, the profile needs to be made and set up various chill, therefore with resin sand molding, after the profile and the pouring system are buried with resin sand together, take sand solidification back, turn over the sand mould, then put into negative pressure sand box with the sand mould whole after turning over and make the bottom surface, the bottom surface is the lightening hole that the gusset handing-over formed, the structure is penetrating, fine be fit for dry sand filling and jolt ramming, bury the bottom surface at the negative pressure sand box and connect the sprue, cover plastic cloth, lay the pouring cup, pour under the condition of taking negative pressure, improve molding efficiency when guaranteeing stamping die's processingquality through real type resin sand molding and dry sand lost foam composite molding, the molding cost is reduced
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (7)
1. The composite molding method of the automobile panel stamping die is characterized by comprising the following steps of:
s1, model manufacturing: manufacturing a foam model according to drawing requirements;
S2, designing a casting process: setting a casting process according to full mold casting, sticking an inner pouring gate on a model, and conveying to-be-curtain coating drying rooms after model inspection;
S3, spray coating: coating the coating according to the conventional Baume requirement, drying, wherein the thickness of the coating after drying is not less than 1.5mm, and reinforcing the model according to the requirement after drying, so as to improve the compression deformation resistance of the model;
S4, modeling: molding the surface on a molding platform by using resin sand;
s5, smelting: controlling the temperature of molten iron according to the required casting temperature, connecting an extraction opening of a dry sand negative pressure sand box with a vacuum pump before casting, starting the vacuum pump, and casting when the negative pressure is controlled to be 0.05-0.06 MPa;
s6, cooling: s5, after vacuum pressure maintaining, starting a cooling system to cool the sand box;
s7, casting shakeout: and separating the molding sand and the casting, and cutting the casting head system to complete the composite molding process of the automobile panel stamping die.
2. The composite molding method of the automobile panel stamping die according to claim 1, wherein the model making in the S1 step includes the steps of:
obtaining a drawing: firstly, obtaining a design drawing or a three-dimensional model of a product;
Preparing a foam material: selecting proper foam materials, including polystyrene and polyurethane foam, wherein the materials have uniform texture and smooth surface and meet the requirements of products;
cutting the foam block: cutting the foam material into a block foam model raw material with a corresponding size by using a hot wire cutting machine or a numerical control cutting device according to the size and the shape of the product;
Rough cutting and finishing: rough cutting and trimming are carried out on the foam blocks, and the appearance of the product is roughly cut out on the foam blocks according to the contour line of the product, so that the foam blocks gradually approach the shape required by design;
And (3) manual adjustment: the foam model is manually adjusted by using a plane and sand paper tool, so that the accuracy of the contour and the curved surface of the product is improved;
Surface treatment: performing surface treatment, including polishing, filling and repairing processes, for improving the surface evenness of the foam model and eliminating obvious flaws and defects;
and (3) manufacturing a matched die: combining a foam model with a mould manufacturing process, and spraying coating materials, including resin and paint, on the surface of the foam model to increase the strength and wear resistance of the model;
and (3) checking: and checking the manufactured foam model to ensure that the size, shape and surface quality of the foam model meet the design requirements.
3. The composite molding method of the automobile panel stamping die according to claim 2, wherein the S4 molding step includes the following operation steps:
placing the direct conformal chill at the corresponding position of the molded surface, and brushing the paint;
And (3) arranging an inner pouring gate, a cross pouring gate and a straight pouring gate according to a molding process, and sleeving the sand box on the model after the paint is directly brushed on the periphery of the conformal chill and dried.
4. The method for compositely molding a stamping die for an automobile panel according to claim 3, wherein when the sand box is placed on a model, sand feeding in all directions is controlled to be not smaller than 120mm in thickness, resin sand mixing is started, sand burying molding is started, sand separating chill is placed at a position where the sand separating chill needs to be arranged, the sand separating thickness is 15mm-25mm, molding sand on the surface of the sand box is scraped after the molded surface is buried tightly, the sand box is left to stand for curing the resin sand, and after 2.5h-3.5h, the resin sand is completely cured, and the sand box is turned over.
5. The composite molding method of the automobile panel stamping die according to claim 3, wherein the S4 molding step further comprises the following operation steps:
Preparing a dry sand negative pressure sand box, placing dry sand with the thickness of 150mm on the bottom surface of the sand box, starting vibration to tap and strickle the dry sand, placing the whole sand box manufactured by resin sand into the dry sand negative pressure sand box, inserting foam rods with the same diameter into a sprue as positioning pins, connecting a sprue ceramic pipe at an exposed section, adding the bottom surface of dry sand buried in the sand box and the periphery of the sand box, starting vibration for 30s every 150mm of the thickness of the sand, burying the whole resin sand in the dry sand negative pressure sand box, compacting and strickling the resin sand.
6. The composite molding method of the automobile panel stamping die according to claim 3, wherein the S4 molding step further comprises the following operation steps:
spreading a layer of plastic cloth on the surface of the dry sand, then placing the dry sand with the thickness of 50-100 mm on the plastic cloth, placing a pouring cup at the top end of the sprue, and piling up the periphery of the pouring cup with sand to avoid the pouring cup from moving.
7. The method for compositely molding the stamping die for the automobile panel according to claim 1, wherein the casting speed of molten iron obtained in the S5 smelting step is under the principle of 'slow before fast and then slow', and the vacuum dwell time is not less than 1h after casting is finished.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118106443A true CN118106443A (en) | 2024-05-31 |
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