CN113999436A - Rubber scalp for crash dummy and manufacturing method - Google Patents
Rubber scalp for crash dummy and manufacturing method Download PDFInfo
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- CN113999436A CN113999436A CN202111305553.4A CN202111305553A CN113999436A CN 113999436 A CN113999436 A CN 113999436A CN 202111305553 A CN202111305553 A CN 202111305553A CN 113999436 A CN113999436 A CN 113999436A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
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Abstract
The invention provides a rubber scalp for a crash dummy and a manufacturing method thereof, comprising the following steps of 1: determining a proportioning scheme of the rubber raw material and the compounding agent; step 2: pretreating a rubber raw material; and step 3: plasticating the pretreated rubber raw material; and 4, step 4: mixing the plasticated rubber raw material with an accessory ingredient; and 5: injecting the mixed rubber raw material into a scalp die for molding; step 6: the resulting dummy scalp product is trimmed. The rubber scalp for the crash dummy and the manufacturing method thereof provided by the invention have the advantages that the new raw materials are used for manufacturing the dummy scalp, so that the sensitivity of the crash dummy scalp to temperature can be effectively reduced, the temperature range of the use environment is expanded, the scalp hardening and aging are slowed down, and the service life is prolonged. The novel scalp forming process flow is further provided, the preparation quality of raw materials is improved, the quality defects in the scalp forming process are reduced, and the actual experience requirements on manufacturers are reduced.
Description
Technical Field
The invention belongs to the field of automobile crash tests, and particularly relates to a rubber scalp for a crash dummy and a manufacturing method thereof.
Background
Because the number of vehicle collision accidents increases year by year, the safety of vehicle collision draws people's extensive attention, and for further promoting the safety performance of automobiles, each country has gradually come out corresponding technical and regulatory and has detected the safety of vehicle collision, and wherein collision dummy plays decisive effect as the important check out test set of the passive safety test of car to the testing result. In a vehicle collision safety test, the head injury of a collision dummy directly influences whether the safety of a vehicle reaches the standard, and an important influencing factor of the head injury of the collision dummy is the performance of the scalp of the collision dummy, so the performance of the scalp of the collision dummy is particularly important for a collision test. Under the condition of the prior art, patent CN111073172A of Suzhou automobile research institute of Qinghua university, a dummy head skin material suitable for collision test of Chinese and a preparation method thereof, discloses a dummy scalp raw material development and preparation method based on polyvinyl chloride PVC, but the developed scalp material has high temperature sensitivity, and the mechanical property of the scalp can be changed after the scalp is used for a period of time. Tianjin good jade Rui Sai Fuke technology Inc. CN107641271A "A crash dummy skin and preparation technology" also discloses the development of dummy scalp raw material based on polyvinyl chloride PVC, and there is also the change of mechanical property of scalp after using for a period of time. Meanwhile, the two patents do not disclose the forming process of the scalp of the dummy in detail or have more thorough improvement on the forming process of the raw materials, but the forming process of the raw materials of the skin is found to be very important in the development and preparation processes of the scalp of the dummy, and is directly related to whether the performance of the scalp of the dummy can reach the expected standard or not.
In summary, the problems in the prior art are as follows:
firstly, the scalp raw material of the dummy in the prior art is generally based on a polyvinyl chloride PVC material, the polyvinyl chloride PVC material can be prepared into a soft collision dummy scalp only by matching with a plasticizer and other auxiliary materials, the plasticizer has strong temperature sensitivity, and the temperature has great influence on the activity of the plasticizer, so that the scalp of the dummy can be used, the temperature is strictly limited, the temperature range is exceeded, the viscoelasticity of a super-cooled or overheated material can be changed, and the performance difference of the scalp raw material and the scalp of a real person is overlarge. Meanwhile, as the time is prolonged, the plasticizer in the raw materials gradually volatilizes, the effect of extension plasticity is reduced, and the scalp of the dummy based on the polyvinyl chloride PVC material gradually becomes hard and aged, so that the scalp loses the original mechanical property.
Secondly, the existing dummy scalp forming process is generally to carry out simple mixing of various raw materials and forming by a mould casting method, the raw materials contain incompletely separated bubbles, and meanwhile, the raw materials are also involved in new gas in the casting process to cause the bubble defect of the product, so the manufacturing quality of the dummy scalp is particularly limited by the practical experience of a manufacturer. Meanwhile, the simple mixing of various raw materials cannot realize the sufficient fusion of the raw materials, and the problem that the quality of the raw materials cannot meet the requirement and the final scalp quality of the dummy is influenced also exists.
Disclosure of Invention
In view of the above, the present invention is directed to a rubber scalp for a crash dummy and a method for manufacturing the same, wherein the new raw material is used to manufacture the dummy scalp, which can effectively reduce the sensitivity of the crash dummy scalp to temperature, expand the temperature range of the use environment, simultaneously improve the physical stability, slow down the hardening and aging of the scalp, and prolong the service life. The novel scalp forming process flow is further provided, the preparation quality of raw materials is improved, the quality defects in the scalp forming process are reduced, and the actual experience requirements on manufacturers are reduced.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the rubber scalp for the crash dummy comprises the following raw materials in parts by weight:
the rubber raw material comprises 100 parts of natural rubber;
the compounding ingredients comprise: 6-10 parts of softening agent alkane oil, 1-2 parts of anti-aging agent RD, 40100.5-1 part of anti-aging agent, 4-6 parts of active agent zinc oxide, 1-2 parts of active agent stearic acid, 1-2 parts of accelerator dithiodibenzothiazole, 0.4-0.6 part of accelerator thiotetramethyl thiuram, 20-30 parts of reinforcing agent carbon black N33020, 15-20 parts of filler calcium carbonate, 6-10 parts of filler silicon dioxide, 1-2 parts of auxiliary agent protective wax and 1-2 parts of sulfur accelerator sulfur;
a method of making a rubber scalp for a crash dummy comprising:
step 1: determining a proportioning scheme of the rubber raw material and the compounding agent: using the rubber raw materials and the compounding agents in the proportion;
step 2: pretreating a rubber raw material:
drying and cutting the natural rubber to select the natural rubber without impurities as a rubber raw material;
and step 3: plasticating the pretreated rubber raw material:
adopting a primary plastication method to be matched with a thin pass plastication method, firstly carrying out primary plastication on the rubber raw material by using an open mill, and then carrying out thin pass plastication to obtain a plasticated rubber raw material;
and 4, step 4: mixing the plasticated rubber raw material with an accessory ingredient:
placing the plasticated rubber raw materials into an open mill, and sequentially adding compounding agents to obtain rubber compound;
and 5: injecting the mixed rubber raw material into a scalp die for molding:
mounting a scalp mould on a heating plate of an injection molding machine, putting the rubber compound into a heating charging basket of the injection molding machine, heating and injecting the rubber compound into the scalp mould, vacuumizing the scalp mould, and maintaining pressure to vulcanize and mold the rubber compound in the scalp mould;
step 6: the resulting dummy scalp product was trimmed:
and cooling the scalp die, taking out the preliminarily molded rubber scalp, trimming and polishing the redundant overflow edge at the die assembly gap of the scalp, and wiping to obtain the final rubber scalp product of the dummy.
In step 4, the rubber raw materials are mixed as follows:
firstly adding a softener alkane oil, adjusting the roll distance of an open mill to be 1.2mm, carrying out thinning for 3 times, then adding an anti-aging agent RD, an anti-aging agent 4010, an active agent zinc oxide, an active agent stearic acid, an accelerator dithiodibenzothiazole and an accelerator thiotetramethyl thiuram, after completely dissolving, carrying out thickening triangular bag for 7 times, carrying out thinning for 6 times, then adding a reinforcing agent carbon black N330, a filler calcium carbonate, a filler silicon dioxide and an auxiliary agent protective wax, carrying out thickening triangular bag for 5 times, carrying out thinning for 3 times, cooling a pull piece, further preheating a rubber material, adjusting the roll distance of the open mill to be 3mm, wrapping the rubber material with a roll, adding a sulfur accelerator sulfur, carrying out thickening triangular bag for 6 times, adjusting the roll distance of the open mill to be 0.4mm, carrying out thinning once, and then carrying out thickening triangular bag for 5 times, thereby completing the mixing of rubber raw materials.
In step 3, the plastication process comprises: setting the temperature of the open mill to be 50 ℃, adjusting the roll spacing to be 4mm, putting the rubber raw material into the open mill for primary plastication, taking out the rubber raw material after 60 minutes, putting the rubber raw material into an oven for heat preservation to prevent the rubber material from cooling, then adjusting the roll spacing of the open mill to be 0.6mm, putting the rubber material into the oven for thin-pass plastication, taking out the rubber raw material after 120 minutes, and finishing the plastication process.
Compared with the prior art, the rubber scalp for the crash dummy and the manufacturing method have the following advantages:
firstly, the invention discloses a technical scheme of raw material proportioning based on natural rubber and matched with a plurality of compounding agents, compared with the existing technical scheme of raw material proportioning based on polyvinyl chloride PVC, the manufactured collision dummy scalp has wider application temperature range, more stable mechanical property, more similar mechanical property with the real scalp, stronger aging resistance and longer service life.
Secondly, the invention discloses a brand-new preparation process of the scalp of the dummy, which can realize the uniform fusion of the rubber raw material and the compounding agent through the pretreatment, plastication, mixing and injection into a scalp mold for molding of the rubber raw material, improve the mixing quality of the raw material, remove bubbles in the raw material, avoid the bubble defect in the product, reduce the experience requirement on molding operators and enable the final scalp product of the dummy to achieve higher product quality.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic flow chart of a method for manufacturing a rubber scalp for a crash dummy according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the appearance of a rubber scalp for a crash dummy according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a rubber scalp for an impact dummy according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the addition of compounding ingredients in a method for manufacturing a rubber scalp for a crash dummy according to an embodiment of the present invention;
FIG. 5 is a first schematic view of a rubber scalp fabricating method scalp mold for a crash dummy according to an embodiment of the present invention;
FIG. 6 is a second schematic view of a rubber scalp fabricating method scalp mold for a crash dummy according to an embodiment of the present invention;
fig. 7 is a schematic view of an injection molding device for manufacturing a rubber scalp for a crash dummy according to an embodiment of the present invention.
Description of reference numerals:
1-a mold core; 2, mounting a mold; 3-lower mould; 4-injection holes of the mould; 5-a mold locking oil cylinder; 6-a top rod; 7-scalp mold; 8-a nozzle; 9-a heater; 10-heating the charging barrel; 11-a screw; 12-a hopper; 13-injection oil cylinder.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The rubber scalp for the crash dummy comprises the following raw materials in parts by weight:
the rubber raw material comprises 100 parts of natural rubber;
the compounding ingredients comprise: 6-10 parts of softening agent alkane oil, 1-2 parts of anti-aging agent RD, 40100.5-1 part of anti-aging agent, 4-6 parts of active agent zinc oxide, 1-2 parts of active agent stearic acid, 1-2 parts of accelerator dithiodibenzothiazole, 0.4-0.6 part of accelerator thiotetramethyl thiuram, 20-30 parts of reinforcing agent carbon black N33020, 15-20 parts of filler calcium carbonate, 6-10 parts of filler silicon dioxide, 1-2 parts of auxiliary agent protective wax and 1-2 parts of sulfur accelerator sulfur;
as shown in fig. 1, a method for manufacturing a rubber scalp for a crash dummy, comprising:
step 1: determining a proportioning scheme of the rubber raw material and the compounding agent:
the proportioning scheme is as follows by weight:
the rubber raw material comprises 100 parts of natural rubber;
the compounding ingredients comprise: 6 to 10 parts of softening agent alkane oil, 1 to 2 parts of anti-aging agent RD, 40100.5 parts to 1 part of anti-aging agent, 4 to 6 parts of activating agent zinc oxide, 1 to 2 parts of activating agent stearic acid, 1 to 2 parts of accelerator dithiodibenzothiazole, 0.4 to 0.6 part of accelerator thiotetramethyl thiuram, 20 to 30 parts of reinforcing agent carbon black N33020, 15 to 20 parts of filler calcium carbonate, 6 to 10 parts of filler silicon dioxide, 1 to 2 parts of auxiliary agent protective wax and 1 to 2 parts of sulfur accelerator;
step 2: pretreating a rubber raw material:
drying and cutting the natural rubber to select the natural rubber without impurities as a rubber raw material;
in this example, the cut rubber was subjected to a rubber crushing treatment using a rubber crusher.
And step 3: plasticating the pretreated rubber raw material:
adopting a primary plastication method to be matched with a thin pass plastication method, firstly carrying out primary plastication on the rubber raw material by using an open mill, and then carrying out thin pass plastication to obtain a plasticated rubber raw material;
and 4, step 4: mixing the plasticated rubber raw material with an accessory ingredient:
placing the plasticated rubber raw materials into an open mill, and sequentially adding compounding agents to obtain rubber compound;
and 5: injecting the mixed rubber raw material into a scalp die for molding:
mounting a scalp mould on a heating plate of an injection molding machine, putting the rubber compound into a heating charging basket of the injection molding machine, heating and injecting the rubber compound into the scalp mould, vacuumizing the scalp mould, and maintaining pressure to vulcanize and mold the rubber compound in the scalp mould;
step 6: the resulting dummy scalp product was trimmed:
and cooling the scalp die, taking out the preliminarily molded rubber scalp, trimming and polishing the redundant overflow edge at the die assembly gap of the scalp, and wiping to obtain the final rubber scalp product of the dummy.
In this embodiment, a small scissors is used to trim the excessive edge at the scalp closing gap, then a handheld sandpaper sander is used to polish the trimmed part, and after polishing is completed, alcohol is used to wipe the trimmed part until the rubber scalp product of the dummy is bright and free of dirt.
As shown in fig. 4, in step 4, the rubber raw materials are kneaded as follows:
in this embodiment, the rubber material is wrapped on a roller with a large diameter of the open mill, a proper amount of accumulation rubber is generated at a roller gap in the rolling process, then various compounding agents are sequentially added, and the rubber is turned and mashed for multiple times, so that the natural rubber and the compounding agents are uniformly mixed to prepare the rubber compound with good performance.
In the embodiment, firstly, a softener alkane oil is added, the roll distance of an open mill is adjusted to be 1.2mm, the thin pass is performed for 3 times, then, an anti-aging agent RD, an anti-aging agent 4010, an active agent zinc oxide, an active agent stearic acid, an accelerator dithiodibenzothiazyl and an accelerator thiotetramethyl thiuram are added, after complete dissolution, a thick triangular bag is formed for 7 times, the thin pass is performed for 6 times, a reinforcing agent carbon black N330, a filler calcium carbonate, a filler silicon dioxide and an auxiliary agent protective wax are added, the thick triangular bag is formed for 5 times, the thin pass is performed for 3 times, a pulling piece is cooled, after rubber materials are preheated, the roll distance of the open mill is adjusted to be 3mm, the rubber materials are wrapped on a roll, a sulfur accelerator is added, the thick triangular bag is formed for 6 times, the roll distance of the open mill is adjusted to be 0.4mm, the thin pass is performed once, and the thick triangular bag is formed for 5 times, and the mixing of the rubber raw materials is completed.
In step 2, the baking glue comprises: and (3) putting the large natural rubber block into an oven environment for heat preservation treatment at the temperature of 50-60 ℃ for 20 hours.
In step 3, the plastication process comprises: setting the temperature of the open mill to be 50 ℃, adjusting the roll spacing to be 4mm, putting the rubber raw material into the open mill for primary plastication, taking out the rubber raw material after 60 minutes, putting the rubber raw material into an oven for heat preservation to prevent the rubber material from cooling, then adjusting the roll spacing of the open mill to be 0.6mm, putting the rubber material into the oven for thin-pass plastication, taking out the rubber raw material after 120 minutes, and finishing the plastication process.
In this embodiment, the plastication adopted is different from the traditional single plastication method, and a one-time plastication method is combined with a thin-pass plastication method for plastication, so that the plastication mode can improve the production efficiency and the plastication quality of rubber, and the raw material of the rubber can achieve better plasticity.
In the embodiment, after the rubber raw material and the compounding agent are subjected to two processes of plastication and mixing, bubbles are removed, and the product defect caused by the fact that bubbles are mixed in the raw material in the existing scalp material preparation process is avoided.
As shown in fig. 7, in step 5, the scalp mold 7 is preheated on the injection molding machine at a preheating temperature of 160 to 170 degrees celsius for 2 hours.
In the present embodiment, as shown in fig. 5 to 7, the scalp mold 7 includes: a mold core 1, an upper mold 2 and a lower mold 3; firstly, an upper die 2 and a lower die 3 are installed on an injection molding machine, a die core 1 is arranged in the upper die 2 and the lower die 3, a die locking oil cylinder 5 is used for controlling an ejector rod 6 to enable the upper die 2 and the lower die 3 to be closed, and the die closing force is 1 ton; further, the mixed rubber material enters a heating charging barrel 10 through a hopper 12, the rubber material is heated by a heater 9 at the temperature of 140-150 ℃ for 1.5 hours to ensure that the rubber material is fully and uniformly heated, the flowability of the heated rubber material is enhanced, and an injection oil cylinder 13 is used for controlling a screw 11 to inject the rubber material into a mold injection hole 4 of a scalp mold 7 through a nozzle 8.
As shown in FIG. 7, in step 5, the speed of injecting the rubber composition into the scalp mold was 300cm3And the injection time is 5 minutes, and meanwhile, a vacuum pump is used for vacuumizing the scalp mold in the injection process, so that the generation of bubble defects is prevented.
In the implementation, an injection molding mode is adopted, so that the artificial scalp skin is more suitable for the artificial scalp based on the rubber raw materials and the compounding agents, and in the rubber injection molding process, the rubber materials mainly undergo two stages of plasticizing injection and hot-pressing vulcanization. The viscosity of the rubber material is reduced and the fluidity is increased in the injection stage; the compound is hardened by cross-linking in the hot press vulcanization stage. Therefore, before the rubber compound is injected, the viscosity of the rubber compound is reduced through a preheating stage, and the rubber compound has better fluidity. The injection temperature is lower than the crosslinking temperature of the rubber material during injection, so that the over-vulcanization is prevented. The injection vulcanization has the biggest characteristic that the temperatures of the inner layer rubber material and the outer layer rubber material are relatively uniform, the product quality is ensured, and the low temperature sensitivity and the strong anti-aging capability of the rubber scalp are realized.
In step 5, the pressure is maintained for 2 hours, and the rubber compound is fully vulcanized and molded.
As shown in fig. 2-3, in step 6, the scalp mold is cooled to 20 to 40 degrees celsius, and the preliminarily molded rubber scalp is taken out.
In this embodiment, the performance of the dummy scalp manufactured by the method disclosed in the present invention is as follows compared with the dummy scalp manufactured by using PVC material in the prior art:
therefore, compared with the dummy scalp manufactured based on the PVC material in the prior art, the dummy rubber scalp manufactured by the method disclosed by the invention has obvious advantages in the aspects of use temperature range, mechanical stability and aging resistance, is closer to the mechanical property of the real scalp, and has longer service life.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A rubber scalp for a crash dummy characterized by:
the rubber comprises the following raw materials in parts by weight:
the rubber raw material comprises 100 parts of natural rubber;
the compounding ingredients comprise: 6-10 parts of softening agent alkane oil, 1-2 parts of anti-aging agent RD, 40100.5-1 part of anti-aging agent, 4-6 parts of activating agent zinc oxide, 1-2 parts of activating agent stearic acid, 1-2 parts of accelerator dithiodibenzothiazole, 0.4-0.6 part of accelerator thiotetramethyl thiuram, 20-30 parts of reinforcing agent carbon black N33020, 15-20 parts of filler calcium carbonate, 6-10 parts of filler silicon dioxide, 1-2 parts of auxiliary agent protective wax and 1-2 parts of sulfur accelerator sulfur.
2. A method for manufacturing rubber scalp for crash dummy is characterized in that: the method comprises the following steps:
step 1: determining a proportioning scheme of the rubber raw material and the compounding agent: using the raw material ratio for rubber scalp of crash dummy as claimed in claim 1;
step 2: pretreating a rubber raw material:
drying and cutting the natural rubber to select the natural rubber without impurities as a rubber raw material;
and step 3: plasticating the pretreated rubber raw material:
adopting a primary plastication method to be matched with a thin pass plastication method, firstly carrying out primary plastication on the rubber raw material by using an open mill, and then carrying out thin pass plastication to obtain a plasticated rubber raw material;
and 4, step 4: mixing the plasticated rubber raw material with an accessory ingredient:
placing the plasticated rubber raw materials into an open mill, and sequentially adding compounding agents to obtain rubber compound;
and 5: injecting the mixed rubber raw material into a scalp die for molding:
mounting a scalp mould on a heating plate of an injection molding machine, putting the rubber compound into a heating charging basket of the injection molding machine, heating and injecting the rubber compound into the scalp mould, vacuumizing the scalp mould, and maintaining pressure to vulcanize and mold the rubber compound in the scalp mould;
step 6: the resulting dummy scalp product was trimmed:
and cooling the scalp die, taking out the preliminarily molded rubber scalp, trimming and polishing the redundant overflow edge at the die assembly gap of the scalp, and wiping to obtain the final rubber scalp product of the dummy.
3. A method of making a rubber scalp for crash dummy according to claim 2 wherein: in step 4, the rubber raw materials are mixed as follows:
firstly adding a softener alkane oil, adjusting the roll distance of an open mill to be 1.2mm, carrying out thinning for 3 times, then adding an anti-aging agent RD, an anti-aging agent 4010, an active agent zinc oxide, an active agent stearic acid, an accelerator dithiodibenzothiazole and an accelerator thiotetramethyl thiuram, after completely dissolving, carrying out thickening triangular bag for 7 times, carrying out thinning for 6 times, then adding a reinforcing agent carbon black N330, a filler calcium carbonate, a filler silicon dioxide and an auxiliary agent protective wax, carrying out thickening triangular bag for 5 times, carrying out thinning for 3 times, cooling a pull piece, further preheating a rubber material, adjusting the roll distance of the open mill to be 3mm, wrapping the rubber material with a roll, adding a sulfur accelerator sulfur, carrying out thickening triangular bag for 6 times, adjusting the roll distance of the open mill to be 0.4mm, carrying out thinning once, and then carrying out thickening triangular bag for 5 times, thereby completing the mixing of rubber raw materials.
4. A method of making a rubber scalp for crash dummy according to claim 2 wherein: in step 2, the baking glue comprises: and (3) putting the large natural rubber block into an oven environment for heat preservation treatment at the temperature of 50-60 ℃ for 20 hours.
5. A method of making a rubber scalp for crash dummy according to claim 2 wherein: in step 3, the plastication process comprises: setting the temperature of the open mill to be 50 ℃, adjusting the roll spacing to be 4mm, putting the rubber raw material into the open mill for primary plastication, taking out the rubber raw material after 60 minutes, putting the rubber raw material into an oven for heat preservation to prevent the rubber material from cooling, then adjusting the roll spacing of the open mill to be 0.6mm, putting the rubber material into the oven for thin-pass plastication, taking out the rubber raw material after 120 minutes, and finishing the plastication process.
6. A method of making a rubber scalp for crash dummy according to claim 2 wherein: in step 5, the scalp mold is preheated on an injection molding machine, the preheating temperature is 160 ℃ to 170 ℃, and the heating time is 2 hours.
7. A method of making a rubber scalp for crash dummy according to claim 2 wherein: in step 5, the speed of injecting the rubber compound into the scalp mold was 300cm3And the injection time is 5 minutes, and meanwhile, a vacuum pump is used for vacuumizing the scalp mold in the injection process, so that the generation of bubble defects is prevented.
8. A method of making a rubber scalp for crash dummy according to claim 2 wherein: in step 5, the pressure is maintained for 2 hours, and the rubber compound is fully vulcanized and molded.
9. A method of making a rubber scalp for crash dummy according to claim 2 wherein: in step 6, the scalp mold is cooled to 20 to 40 degrees celsius, and the preliminarily molded rubber scalp is taken out.
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| CN202111305553.4A CN113999436B (en) | 2021-11-05 | 2021-11-05 | Rubber scalp for collision dummy and manufacturing method |
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| CN113999436B (en) | 2023-03-31 |
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