CN116159968A - Deformation-preventing engineering plastic filler framework structure and application thereof - Google Patents
Deformation-preventing engineering plastic filler framework structure and application thereof Download PDFInfo
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- CN116159968A CN116159968A CN202211594037.2A CN202211594037A CN116159968A CN 116159968 A CN116159968 A CN 116159968A CN 202211594037 A CN202211594037 A CN 202211594037A CN 116159968 A CN116159968 A CN 116159968A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention aims to provide a deformation-preventing engineering plastic filler framework structure and application thereof, and belongs to the technical field of investment precision casting manufacture. The engineering plastic skeleton is added into the die for wax pressing and wrapping, and the engineering plastic has good mechanical strength, dimensional stability and rigidity, so that the wax component cannot generate plastic permanent deformation in the following trimming, combining, placing and shell manufacturing processes to cause serious out-of-tolerance of the profile of the curved surface of the casting, thereby not only effectively reducing the complexity of the structural design of the wax mould of the product, but also avoiding subsequent mass processing of the casting, reducing the processing cost of the product and obviously shortening the production period.
Description
Technical Field
The invention belongs to the technical field of investment precision casting manufacturing, and particularly provides an anti-deformation engineering plastic filler framework structure and application thereof.
Background
With the rapid development of the fields of aerospace, weaponry and the like in China, the demand for aluminum alloy castings is increasing, the requirements for dimensional accuracy, surface quality and internal metallurgical quality of castings are also increasing, and the aluminum alloy castings gradually develop to large, thin-wall, complex and integral directions. For castings with the profile requirements on thin-wall curved surfaces, particularly runner surfaces, wax parts which are generally used for investment casting are extremely easy to deform which influences the profile, such as distortion, collapse and the like, so that the runner surfaces of the castings obtained by final casting are severely deformed, and the castings are unqualified. The prior art measures are to prevent deformation by adding compensation or adding process ribs.
Deformation is prevented by adding compensation or process ribs, the design difficulty of a casting structure can be increased, the casting yield is reduced, the follow-up shoveling and processing are difficult, the expenditure of expenditure can be increased, and the production period of the casting can be prolonged.
Disclosure of Invention
In order to overcome the problems of the prior art, the invention aims to provide an anti-deformation engineering plastic filler framework structure and application thereof.
The technical scheme of the invention is as follows:
the utility model provides a preapring for an unfavorable turn of events shape engineering plastics filler skeleton texture which characterized in that: the filler skeleton structure evenly distributed has the hole structure to do benefit to wax material filling type, evenly distributed has the identical location bump in both sides simultaneously, in order to guarantee that filler skeleton structure is located wax matrix intermediate position.
As a preferable technical scheme:
the diameter of the hole structure is 3-7 mm, and the interval between two adjacent hole structures is 30-50 mm; the wall thickness of the filler skeleton structure is between 1 and 3 mm, the specific thickness of different parts depends on the thickness of castings at the different parts, so that the consistency of the thickness of wax patterns at two sides of each part is ensured, and the joint of the corner and the thickness adopts arc transition.
The filler skeleton structure is prepared from engineering plastics, the invention preferably adopts high-rigidity engineering plastics, the Rockwell hardness of the engineering plastics is more than or equal to 115, the static bending strength of the engineering plastics is more than or equal to 100MPa, the high-rigidity engineering plastics comprise 15-25 parts by weight of ABS resin, 75-85 parts by weight of SAN copolymer and 0.8-1.5 parts by weight of auxiliary agent, wherein the addition amount of the ABS resin and the SAN copolymer is 100 parts by weight, the auxiliary agent is a lubricant, and the ABS resin is an emulsion grafting-bulk SAN blending ABS resin.
Wherein:
every 100 weight parts of ABS resin comprises 14 to 20 weight parts of ABS grafted powder and 80 to 86 weight parts of SAN copolymer, wherein the average rubber particle size of the ABS grafted powder is 0.2 to 0.5 mu m; the ABS grafted powder is a grafted polymer formed by emulsion polymerization of 50-55wt% of rubber particles formed by polybutadiene rubber and 45-50wt% of SAN copolymer; the melt index of the ABS resin at the test temperature of 220 ℃ and under the load of 10kg is 3-8 g/10 min.
15 to 25 parts by weight of acrylonitrile and 75 to 85 parts by weight of styrene per 100 parts by weight of SAN copolymer, the SAN resin having an average molecular weight of 180000 to 300000;
the lubricant is one or more of vinyl distearamide and stearate, and the stearate is one or more of magnesium stearate, calcium stearate, zinc stearate and barium stearate.
And (3) carrying out melt blending and extrusion on the ABS resin, the SAN copolymer and the lubricant to obtain the high-rigidity engineering plastic.
The invention also provides a manufacturing method of the aluminum alloy precision casting wax mould with the deformation-preventing engineering plastic filler framework structure, which is characterized by comprising the following steps of:
1) According to the structural characteristics of the casting, designing a skeleton structure of the deformation-preventing engineering plastic filler by utilizing three-dimensional modeling software;
2) Designing and manufacturing a mould of the deformation-preventing engineering plastic filler skeleton structure;
3) Drying engineering plastics and preheating a mould;
4) Injecting engineering plastics into the mould;
5) After the engineering plastic is cooled and hardened, taking a die;
6) Cleaning positioning convex points on two sides of the skeleton structure of the engineering plastic filler, and ensuring that the top ends of all the positioning convex points are all smooth and free of foreign matters;
7) Heating the engineering plastic filler skeleton structure to remove internal stress, and specifically comprises the following steps: placing the engineering plastic filler skeleton structure in a hot air circulation drying oven at 70-80 ℃ for 2-4 h, and cooling to room temperature;
8) Placing the destressing engineering plastic filler skeleton structure into a product wax mould;
9) And (5) manufacturing a wax mould on a wax pressing machine.
Wherein:
in the step 2), the mould of the deformation-preventing engineering plastic filler framework structure is formed by adopting a stainless steel material through mechanical processing.
In the step 3), before injection molding, the engineering plastic needs to be dried, the drying temperature is 70-85 ℃, and the drying time is 2-6 hours; the mould needs to be preheated to 50-100 ℃ before injection molding.
In the step 4), the injection temperature of the engineering plastic is 240-265 ℃.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the engineering plastic skeleton is added into the die for wax pressing and wrapping, and the engineering plastic has good mechanical strength, dimensional stability and rigidity, so that the wax component cannot generate plastic permanent deformation in the following trimming, combining, placing and shell manufacturing processes to cause serious out-of-tolerance of the profile of the curved surface of the casting, thereby not only effectively reducing the complexity of the structural design of the wax mould of the product, but also avoiding subsequent mass processing of the casting, reducing the processing cost of the product and obviously shortening the production period.
Drawings
FIG. 1 is a schematic diagram of a skeleton structure of a deformation-preventing engineering plastic filler.
Reference numerals: 1-a filler skeletal structure; a 2-hole structure; and 3-positioning the convex points.
Detailed Description
Example 1
As shown in fig. 1, a deformation-preventing engineering plastic filler skeleton structure 1 is provided with hole structures 2 with diameters of 5 mm uniformly distributed thereon, the interval between two adjacent hole structures 2 is 30-50 mm, simultaneously, the two sides of the structure are uniformly distributed with identical positioning convex points 3, the wall thickness of the filler skeleton structure 1 is 1-2 mm, the specific thickness of different parts depends on the thickness of castings at the parts, so that the thickness of wax patterns at two sides of each part is consistent, and the joint of a corner and the thickness adopts arc transition.
The filler skeleton structure 1 adopts high-rigidity engineering plastics and comprises 15 parts by weight of ABS resin (acrylonitrile-butadiene-styrene), 85 parts by weight of SAN copolymer (styrene-acrylonitrile) and 1.5 parts by weight of auxiliary agent, wherein the ABS resin is emulsion grafting-bulk SAN blending ABS resin, and the melt index of the ABS resin is 8g/10 min at the test temperature of 220 ℃ and under the load of 10 kg.
The ABS resin contained 20 parts by weight of ABS graft powder (rubber particles formed of 52% of polybutadiene rubber as ABS graft powder and 48% by weight of a graft polymer formed of SAN copolymer by emulsion polymerization, the average rubber particle size was 0.4 μm), 80 parts by weight of SAN copolymer, relative to 100 parts by weight of ABS resin.
Comprises 15 parts by weight of acrylonitrile and 85 parts by weight of styrene relative to 100 parts by weight of the SAN copolymer. The average molecular weight of the SAN copolymer was 290000.
The auxiliary agent is magnesium stearate with internal lubrication and external lubrication.
And (3) carrying out melt blending and extrusion on the ABS resin, the SAN copolymer and the lubricant to obtain the Rockwell hardness 121 and the static bending strength 108MPa of the high-rigidity engineering plastic.
Example 2
The difference with the embodiment 1 is that the adopted engineering plastic has different components and proportions, and the concrete steps are as follows:
a high-rigidity engineering plastic comprises 20 parts by weight of ABS resin (acrylonitrile-butadiene-styrene), 80 parts by weight of SAN copolymer (styrene-acrylonitrile) and 1.3 parts by weight of auxiliary agent, wherein the ABS resin is emulsion grafting-bulk SAN blending ABS resin, and the melt index of the ABS resin is 8g/10 min at the test temperature of 220 ℃ and under the load of 10 kg.
The ABS resin contained 16 parts by weight of ABS graft powder (ABS graft powder was 50% of rubber particles formed of polybutadiene rubber and 50% by weight of a graft polymer formed of SAN copolymer by emulsion polymerization, and the average rubber particle size was 0.3 μm), 84 parts by weight of SAN copolymer, relative to 100 parts by weight of ABS resin.
Comprising 19 parts by weight of acrylonitrile and 81 parts by weight of styrene relative to 100 parts by weight of the SAN copolymer. The average molecular weight of the SAN copolymer was 280000.
The auxiliary agent comprises 1.1 parts by weight of an EBA internal lubricant and 0.2 parts by weight of magnesium stearate with both internal and external lubrication.
And (3) carrying out melt blending and extrusion on the ABS resin, the SAN copolymer and the lubricant to obtain the Rockwell hardness 120 and the static bending strength 105MPa of the high-rigidity engineering plastic.
Example 3
Taking an aluminum alloy frame casting of a certain model as an example, the material ZL101A has the outline dimension of 670mm multiplied by 500mm multiplied by 210mm, the typical wall thickness is 4mm, and the casting is of class I and dimensional accuracy CT7. The implementation method comprises the following specific steps:
step 1): the casting is provided with a large thin-wall plane, a UG three-dimensional modeling software is used for designing an anti-deformation engineering plastic filler framework structure according to the plane size and structure, the wall thickness of the engineering plastic filler framework structure is 2 mm, hole structures with the diameter of 5 mm are uniformly distributed, the interval between two adjacent hole structures is 35 mm, and 6 identical positioning protruding points are uniformly distributed on two sides of the two adjacent hole structures.
Step 2): according to the deformation-preventing engineering plastic filler skeleton structure designed in the step 1), a mold of the deformation-preventing engineering plastic filler skeleton structure is designed through a Boolean operation tool of UG three-dimensional modeling software, and then a stainless steel mold is machined through machining.
Step 3): the engineering plastic described in example 1 was previously put into a circulating hot air drying oven at 75 ℃ for drying treatment for 3 hours, while the stainless steel mold was preheated to 70 ℃.
Step 4): and (3) heating and melting engineering plastics, and injecting the engineering plastics into a preheated stainless steel die when the temperature reaches 250 ℃.
Step 5): and taking out the engineering plastic from the stainless steel die after the engineering plastic is cooled and hardened.
Step 6): cleaning the positioning convex points on the two sides of the engineering plastic filler framework structure taken out in the step 5), and ensuring that the top ends of all the positioning convex points are smooth and free of foreign matters.
Step 7): and (3) placing the cleaned engineering plastic filler skeleton structure in a hot air circulation drying oven at 70 ℃ for heating for 2 hours to remove internal stress, and cooling to room temperature.
Step 8): and (3) placing the stressed engineering plastic filler skeleton structure into a product wax mould, manufacturing a wax mould on a wax pressing machine, and taking the mould after the wax mould is cooled.
And (3) detecting the size of the wax mould with the deformation-preventing engineering plastic filler framework structure, wherein the wax mould at the plane is not deformed obviously, and the casting requirement is met. Compared with the process rib added at the thin-wall plane, the cost of about 0.5 ten thousand yuan is saved, and the processing period is shortened by 5 days. The size of the casting is tested, and the size precision reaches CT7.
Example 4
Taking an aluminum alloy rear cabin casting of a certain model as an example, the material ZL114A is provided with a large air inlet curved surface structure, the typical wall thickness is 4mm, and the casting is of class I and dimensional accuracy CT7. The implementation method comprises the following specific steps:
step 1): the casting is provided with a large air inlet channel curved surface structure, a wax piece is extremely easy to deform, a UG three-dimensional modeling software is used for designing an anti-deformation engineering plastic filler framework structure according to the curved surface size and structure, the wall thickness of the engineering plastic filler framework structure is 1.5 mm, hole structures with the diameter of 5 mm are uniformly distributed, the interval between two adjacent hole structures is 45 mm, and 10 identical positioning protruding points are uniformly distributed on two sides of the hole structures.
Step 2): according to the deformation-preventing engineering plastic filler skeleton structure designed in the step 1), a mold of the deformation-preventing engineering plastic filler skeleton structure is designed through a Boolean operation tool of UG three-dimensional modeling software, and then a stainless steel mold is machined through machining.
Step 3): the engineering plastic described in example 2 was previously put into a circulating hot air drying oven at a temperature of 70 ℃ for drying treatment for 4 hours, while the stainless steel mold was preheated to 85 ℃.
Step 4): and (3) heating and melting engineering plastics, and injecting the engineering plastics into a preheated stainless steel die when the temperature reaches 265 ℃.
Step 5): and taking out the engineering plastic from the stainless steel die after the engineering plastic is cooled and hardened.
Step 6): cleaning the positioning convex points on the two sides of the engineering plastic filler framework structure taken out in the step 5), and ensuring that the top ends of all the positioning convex points are smooth and free of foreign matters.
Step 7): and (3) placing the cleaned engineering plastic filler skeleton structure in a hot air circulation drying oven at 75 ℃ for heating for 3 hours to remove internal stress, and cooling to room temperature.
Step 8): and (3) placing the destressing engineering plastic filler skeleton structure into a product wax mould, manufacturing a wax mould on a wax pressing machine, and taking the mould after the wax mould is cooled.
And (3) detecting the size of the wax mould with the deformation-preventing engineering plastic filler framework structure, wherein the wax mould at the plane is not deformed obviously, and the casting requirement is met. Compared with the process rib added at the thin-wall plane, the cost of about 1 ten thousand yuan is saved, and the processing period is shortened by 7 days. The size of the casting is tested, and the size precision reaches CT7.
Comparative example
Taking an aluminum alloy rear cabin casting of a certain model as an example, the material ZL114A is provided with a large air inlet curved surface structure, the typical wall thickness is 4mm, and the casting is of class I and dimensional accuracy CT7. The casting has a large air inlet channel curved surface structure, and the wax piece is extremely easy to deform.
And directly manufacturing the wax mould on a wax pressing machine, and taking the mould after the wax mould is cooled. The wax mould without the deformation-preventing engineering plastic filler framework structure is subjected to size detection, and the wax part at the curved surface structure of the large air inlet channel is found to be obviously deformed, and the requirement of castings can be met through local repair and correction in the later period, so that 10 technological ribs are uniformly adhered at the curved surface in order to prevent the wax part from being deformed in the subsequent transportation and shell manufacturing processes. The dimensional accuracy of the cast is found to be CT8 only after casting pouring, repeated correction is then carried out, and meanwhile, the cutting and polishing of process ribs are delayed for a long time. Compared with the wax mould with the deformation-preventing engineering plastic filler skeleton structure designed at the thin-wall curved surface, the wax mould is manufactured and cast to obtain the casting, the whole process costs about 2 ten thousand yuan more, and the delay period is 10 days.
In summary, the engineering plastic skeleton is added into the die for wax pressing during the manufacturing of the wax mould, and the engineering plastic has good mechanical strength and dimensional stability, so that the wax parts cannot generate plastic permanent deformation in the subsequent trimming, combining and placing and shell manufacturing processes to cause serious out-of-tolerance problem of the profile of the curved surface of the casting, thereby not only effectively reducing the complexity of the structural design of the wax mould of the product, but also avoiding the subsequent mass processing of the casting, reducing the processing cost of the product and obviously shortening the production period.
The invention is not a matter of the known technology.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a preapring for an unfavorable turn of events shape engineering plastics filler skeleton texture which characterized in that: the filler framework structure is uniformly distributed with hole structures, and meanwhile, the inner side and the outer side of the framework structure are uniformly distributed with identical positioning protruding points.
2. The deformation-resistant engineering plastic filler skeletal structure of claim 1, wherein: the diameter of the hole structure is 3-7 mm, and the interval between two adjacent hole structures is 30-50 mm; the wall thickness of the filler framework structure is between 1 and 3 mm, and the joint of the corner and the thickness adopts arc transition.
3. The deformation-resistant engineering plastic filler skeletal structure of claim 1, wherein: the filler skeleton structure is prepared from engineering plastics, wherein the engineering plastics comprise 15-25 parts by weight of ABS resin, 75-85 parts by weight of SAN copolymer and 0.8-1.5 parts by weight of auxiliary agent, the sum of the addition amount of the ABS resin and the SAN copolymer is 100 parts by weight, the auxiliary agent is a lubricant, and the ABS resin is an emulsion grafting-bulk SAN blending ABS resin.
4. A deformation-resistant engineering plastic filler skeletal structure according to claim 3, wherein:
every 100 weight parts of ABS resin comprises 14 to 20 weight parts of ABS grafted powder and 80 to 86 weight parts of SAN copolymer, wherein the average rubber particle size of the ABS grafted powder is 0.2 to 0.5 mu m; the ABS grafted powder is a grafted polymer formed by emulsion polymerization of 50-55wt% of rubber particles formed by polybutadiene rubber and 45-50wt% of SAN copolymer;
15 to 25 parts by weight of acrylonitrile and 75 to 85 parts by weight of styrene per 100 parts by weight of SAN copolymer, the SAN resin having an average molecular weight of 180000 to 300000;
the lubricant is one or more of vinyl distearamide and stearate.
5. The deformation-preventing engineering plastic filler skeleton structure according to claim 4, wherein: the melt index of the ABS resin at the test temperature of 220 ℃ and under the load of 10kg is 3-8 g/10 min.
6. The deformation-preventing engineering plastic filler skeleton structure according to claim 4, wherein: the stearate is one or more of magnesium stearate, calcium stearate, zinc stearate and barium stearate.
7. A method for manufacturing an aluminum alloy precision casting wax mould with the deformation-preventing engineering plastic filler framework structure as claimed in claim 1, which is characterized by comprising the following steps:
1) According to the structural characteristics of the casting, designing a skeleton structure of the deformation-preventing engineering plastic filler by utilizing three-dimensional modeling software;
2) Designing and manufacturing a mould of the deformation-preventing engineering plastic filler skeleton structure;
3) Drying engineering plastics and preheating a mould;
4) Injecting engineering plastics into the mould;
5) After the engineering plastic is cooled and hardened, taking a die;
6) Cleaning positioning convex points on two sides of the skeleton structure of the engineering plastic filler, and ensuring that the top ends of all the positioning convex points are all smooth and free of foreign matters;
7) Placing the engineering plastic filler skeleton structure in a hot air circulation drying oven at 70-80 ℃ for 2-4 h, and cooling to room temperature;
8) Placing the destressing engineering plastic filler skeleton structure into a product wax mould;
9) And (5) manufacturing a wax mould on a wax pressing machine.
8. The method for manufacturing the aluminum alloy precision casting wax mould with the deformation-preventing engineering plastic filler framework structure, which is characterized in that: in the step 2), the mould of the deformation-preventing engineering plastic filler framework structure is formed by adopting a stainless steel material through mechanical processing.
9. An aluminum alloy with deformation-preventing engineering plastic filler skeleton structure according to claim 7
The manufacturing method of the precision casting wax mould is characterized by comprising the following steps of: in the step 3), the drying temperature is 70-85 ℃ and the drying time is 2-6 h; the mould is preheated to 50-100 ℃ before injection molding.
10. The method for manufacturing the aluminum alloy precision casting wax mould with the deformation-preventing engineering plastic filler framework structure, which is characterized in that: in the step 4), the injection temperature of the engineering plastic is 240-265 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211594037.2A CN116159968A (en) | 2022-12-13 | 2022-12-13 | Deformation-preventing engineering plastic filler framework structure and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211594037.2A CN116159968A (en) | 2022-12-13 | 2022-12-13 | Deformation-preventing engineering plastic filler framework structure and application thereof |
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| Publication Number | Publication Date |
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| CN116159968A true CN116159968A (en) | 2023-05-26 |
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| CN202211594037.2A Pending CN116159968A (en) | 2022-12-13 | 2022-12-13 | Deformation-preventing engineering plastic filler framework structure and application thereof |
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- 2022-12-13 CN CN202211594037.2A patent/CN116159968A/en active Pending
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