CN115071036B - Method, device and storage medium for preprocessing raw materials of skin muscle layer of collision dummy - Google Patents
Method, device and storage medium for preprocessing raw materials of skin muscle layer of collision dummy Download PDFInfo
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- CN115071036B CN115071036B CN202210844706.0A CN202210844706A CN115071036B CN 115071036 B CN115071036 B CN 115071036B CN 202210844706 A CN202210844706 A CN 202210844706A CN 115071036 B CN115071036 B CN 115071036B
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/35—Component parts; Details or accessories
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/702—Imitation articles, e.g. statues, mannequins
- B29L2031/7028—Statues, mannequins, taxidermic articles
Abstract
The invention relates to the field of collision dummy, and discloses a method, equipment and a storage medium for pretreating raw materials of skin muscle layers of a collision dummy. The method comprises the following steps: screening multiple groups of second foaming bodies from multiple groups of first foaming bodies on the basis of an image processing technology, wherein the multiple groups of first foaming bodies are obtained by respectively pouring multiple groups of mixed raw materials into a foaming device for foaming, the multiple groups of mixed raw materials are obtained by respectively mixing and stirring multiple groups of same polyurethane foaming combined materials under the conditions of the same environmental temperature, the same stirring speed and different stirring durations, and the volume of the foaming device is the same as that of a dummy skin cavity to be filled; and determining the optimal stirring time according to each group of second foaming bodies. The determination of the optimal stirring time length of the raw materials for manufacturing the skin muscle layer of the collision dummy is realized, so that the skin muscle layer of the collision dummy manufactured based on the mixed raw materials stirred according to the optimal stirring time length has better uniformity and compactness.
Description
Technical Field
The invention relates to the field of collision dummy, in particular to a method, equipment and a storage medium for preprocessing raw materials of a skin muscle layer of a collision dummy.
Background
The automobile crash dummy is mainly used for evaluating the passive safety of an automobile in an automobile crash test, and human body injury data are obtained through the automobile crash test, so that the safety of the automobile is evaluated. Therefore, how to obtain the limb skin of the automobile collision dummy which is similar to the human body in shape, equivalent in structure and simulated in mechanical response is particularly important for accurately evaluating the safety of the automobile. The dummy skin is mainly composed of a single simulated skin or a combined simulated skin with a padded muscle layer.
For the skin of the dummy having the muscle layer, the mechanical properties of the material are mainly represented by the muscle layer, which requires the skin material having the muscle layer to have uniform and dense foam quality. The uniformity and compactness of the foam quality are closely related to the pretreatment process of the raw material of the skin muscle layer, such as the stirring time and the filling time of the raw material of the skin muscle layer. Therefore, a pretreatment method of raw materials for the skin muscle layer of the automobile crash dummy is needed to provide a basis for obtaining a skin muscle layer of the dummy with uniform and dense foaming quality.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pretreatment method, equipment and a storage medium for raw materials of a skin muscle layer of a collision dummy, which realize the determination of the optimal stirring time length of the raw materials for preparing the skin muscle layer of the collision dummy, so that the skin muscle layer of the collision dummy prepared based on the mixed raw materials stirred according to the optimal stirring time length has better uniformity and compactness, and the skin muscle layer of the collision dummy in an automobile collision test has higher response characteristic of bionics.
The embodiment of the invention provides a pretreatment method of a raw material of a skin muscle layer of a collision dummy, which comprises the following steps:
screening multiple groups of second foaming bodies meeting a first set condition from multiple groups of first foaming bodies based on an image processing technology, wherein the multiple groups of first foaming bodies are obtained by respectively pouring multiple groups of mixed raw materials into a foaming device for foaming, the multiple groups of mixed raw materials are obtained by respectively mixing and stirring multiple groups of same polyurethane foaming combined materials under the conditions of the same environmental temperature, the same stirring speed and different stirring time lengths, and the volume of the foaming device is the same as that of a dummy skin cavity to be filled;
cutting each group of second foaming bodies in the multiple groups of second foaming bodies according to a preset mode to enable each group of second foaming bodies to respectively comprise multiple sub-foaming bodies;
according to the plurality of sub-foaming bodies respectively included by each group of second foaming bodies, evaluating the quality uniformity of each group of second foaming bodies, and respectively obtaining the quality variance of each group of second foaming bodies;
according to the plurality of sub-foaming bodies respectively included by each group of second foaming bodies, evaluating the compactness of each group of second foaming bodies, and respectively obtaining the average value of the foaming quantity of each group of second foaming bodies with the diameter larger than or equal to 2 mm;
determining a second foaming group with the mass variance smaller than a first threshold and/or the average value of the foaming quantity smaller than a second threshold as a target foaming group;
and determining the minimum value of the stirring time lengths respectively corresponding to the target foam components as the optimal stirring time length.
The embodiment of the invention provides a method for processing raw materials of a skin muscle layer of a collision dummy, which comprises the following steps:
determining the total mass of the polyurethane foaming composite material and the proportion of two polyurethane raw materials according to the body part of the dummy to be filled, wherein the polyurethane foaming composite material consists of the two polyurethane raw materials;
respectively determining the respective mass of the two polyurethane raw materials according to the total mass and the ratio of the two polyurethane raw materials;
setting the rotating speed of a stirring device as a target rotating speed, setting the stirring time of the stirring device as an optimal stirring time, controlling the stirring device to start, and mixing and stirring the two polyurethane raw materials with the quality through the stirring device to obtain mixed raw materials;
determining a target pouring rate according to the set maximum pouring rate and the set minimum pouring rate;
pouring the mixed raw materials into a mold corresponding to the body part according to the target pouring rate to obtain a skin muscle layer of the body part;
wherein the optimal stirring time, the set maximum pouring rate and the set minimum pouring rate are determined based on the pretreatment method of the raw materials of the skin and muscle layer of the collision dummy.
An embodiment of the present invention provides an electronic device, including:
a processor and a memory;
the processor is used for executing the steps of the collision dummy skin muscle layer raw material preprocessing method in any embodiment by calling the program or the instructions stored in the memory.
Embodiments of the present invention provide a computer-readable storage medium storing a program or instructions for causing a computer to perform the steps of a method for pre-processing raw materials of a skin muscle layer of a collision dummy according to any one of the embodiments.
The embodiment of the invention has the following technical effects:
the determination of the optimal stirring time length of the raw materials for manufacturing the skin muscle layer of the collision dummy is realized, so that the skin muscle layer of the collision dummy manufactured based on the mixed raw materials stirred according to the optimal stirring time length has better uniformity and compactness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for pre-treating raw materials of a skin muscle layer of a collision dummy according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a foaming device with adjustable volume according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a foaming device with adjustable volume according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a foaming device with adjustable volume according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a foaming device with adjustable volume according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a foaming device with adjustable volume according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a stirred hopper assembly according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a stirred hopper assembly according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a stirred hopper assembly according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a second foam body according to an embodiment of the present invention being uniformly divided into four equal parts;
FIG. 11 is a schematic diagram of a cross section of a sub-foam cut from a second foam close to a pouring gate according to an embodiment of the present invention;
FIG. 12 is a graph of rise height versus reaction temperature over time for a foam provided in accordance with an embodiment of the present invention;
fig. 13 is a schematic flow chart of determining a stirring time (i.e., an optimal stirring time period) according to an embodiment of the present invention;
FIG. 14 is a schematic flow chart for determining a pouring rate according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for preprocessing the raw materials of the skin and muscle layers of the collision dummy provided by the embodiment of the invention can be executed by electronic equipment. FIG. 1 is a flow chart of a method for pre-treating raw materials of a skin muscle layer of a collision dummy according to an embodiment of the invention. Referring to fig. 1, the pretreatment method of the collision dummy skin muscle layer raw material specifically comprises the following steps:
Specifically, polyurethane is selected as a raw material of a skin muscle layer of the dummy, the polyurethane foaming composite material consists of a material A and a material B, and the total mass of the polyurethane foaming composite material and the proportion of the two polyurethane raw materials are determined according to the body part of the dummy to be filled. Determining the mass m of the polyurethane foaming composite material according to the volume V of the dummy skin cavity to be filled and the density rho of polyurethane required to be filled: m = ρ × V.
Considering that the polyurethane foaming composite material has wall hanging and other loss in the casting process, the total mass M of the polyurethane foaming composite material required to be prepared is as follows: m = Km = K × ρ × V, where K is a natural number greater than 1. According to the proportion of the material A and the material B consisting of the two polyurethane raw materials, the mass of the two raw materials are respectively determined as follows:
in particular, assume that the dummy chest skin cavity volume to be filled is V =874.5cm 3 Selecting the density rho =0.12g/cm3 of the foamed polyurethane according to the quality of the upper arm of the dummy, and determining according to the wall hanging loss of the polyurethane foaming composite materialK =1.05, so as to determine the total mass M =1.05 × 0.12 × 874.5=110.2g of the polyurethane foam composition. Selecting the mass ratio of the polyurethane A material to the polyurethane B material according to the hardness of the upper arm of the dummy as A: b =110:35, thereby obtaining the mass m of the material A A =83.7g, mass m of B material B It was 26.5g.
Determining 83.7g of the material A and 26.5g of the material B as a group of polyurethane foaming combined materials, and preparing a plurality of groups of the same polyurethane foaming combined materials, namely the total mass M of each group of the polyurethane foaming combined materials is the same as the mass ratio of the material A to the material B. Assuming that 7 sets of identical polyurethane foaming compositions are prepared, the 7 sets of identical polyurethane foaming compositions are labeled f1, f2, f3, f4, f5, f6, and f7, respectively.
And respectively pouring each group of polyurethane foaming composite materials into a stirring device for mixing and stirring at room temperature of 25 ℃, wherein the stirring time of different groups of polyurethane foaming composite materials is different, but the stirring rotating speed is the same, for example, the initial rotating speed of the stirring device is set to be n, and the stirring time is set to be a, wherein n is 1500-3000 r/min, and a is 5-12s. For example, the stirring time period of f1 is set to 4s, the stirring time period of f2 is set to 6s, the stirring time period of f3 is set to 8s, the stirring time period of f4 is set to 10s, the stirring time period of f5 is set to 12s, the stirring time period of f6 is set to 14s, and the stirring time period of f7 is set to 16s. And after stirring, 7 groups of mixed raw materials are obtained, and the 7 groups of mixed raw materials are respectively poured into a foaming device for foaming to obtain 7 groups of first foams.
Optionally, the foaming device may be a foaming device with an adjustable volume, specifically, the volume of the foaming device is adjusted to be the same as the volume V of the dummy skin cavity to be filled, foaming is performed under the condition that the volume is V, after foaming is completed, standing is performed at room temperature for more than 40min, and after the foam body is stable in shape, the foam body is taken out of the foaming device to obtain the first foam body.
Referring to fig. 2-7, the foaming device with adjustable volume mainly comprises a volume adjusting plug 11, a lower mold plate 21, an upper cover plate 31 and a sealing cover 41. Wherein, the volume adjusting plug 11 comprises a rotary adjusting round handle 11a connected with a threaded lead screw; the plunger 11b controls the volume and is provided with a vent hole, so that gas in the cavity of the device can be conveniently discharged during foaming; and a slide bar 11c preventing rotation of the plunger 11b while facilitating sliding of the plunger 11 b. The inner wall of the lower template 21 is a semi-cylindrical shape with the radius of 15cm, and the side wall close to the volume adjusting plug 11 is provided with a vent hole 21a, so that the phenomenon that the movement of the plunger 11b is blocked due to overlarge pressure during movement is avoided; the lower mold plate 21 is provided at both sides with sealing strips 21b for sealing the foaming device. The inner wall of the upper cover plate 31 is in a semi-cylindrical shape with the radius of 15cm and is used for being matched with the lower template 21, two sides of the upper cover plate 31 are provided with sealing grooves matched with the sealing strips 21b, and the upper cover plate 31 and the lower template 21 are tightly attached through bolts at two sides; the upper surface of the upper cover plate 31 on the side away from the volume adjusting plug 11 is provided with a pouring port 31a for pouring a foaming material and forming a seal by a sealing cover 41.
When using the foaming device, turning the volume adjustment plug 11 adjusts the volume of the foaming device to the same size as the volume of the cavity of the dummy skin to be filled, e.g. V =874.5cm 3 And a layer of anti-sticking film is tightly adhered to the inner walls of the lower template 21 and the upper cover plate 31 of the device, so that the foamed foam body can be conveniently and smoothly taken out, the lower template 21 and the upper cover plate 31 are fastened by bolts, the pouring gate 31a is opened, and the flow control opening 62 of the stirring pouring funnel device is aligned to the pouring gate 31a of the foaming device.
The polyurethane foaming composition can be stirred using a stirred casting hopper apparatus. The stirring and pouring funnel device is used for avoiding unnecessary time waste in the stirring and pouring process, and pouring can be carried out immediately after the stirring is finished. Illustratively, referring to the schematic construction of a churning and pouring funnel assembly as shown in fig. 7-9, a churning and pouring funnel assembly generally includes a frame 12, a slide rod 22, a churning barrel 32, a churning barrel seal cap 42, a spout seal cap 52, a flow control opening 62, and a pressurization device 72. Wherein, the bracket 12 is used for supporting the whole stirring and pouring funnel device, and the upper and lower heights of the bracket can be freely adjusted. The slide bar 22 is used for adjustment of the agitating barrel 32 in the horizontal direction. The mixing tank 32 is provided with a pouring gate 32a for pouring the polyurethane A and B, which are separated from each other on the left and right sides and are sealed by a pouring gate sealing cover 52. The agitator sealing lid 42 is used to seal the entire agitator 32, and mainly includes a sealing lid 42a, an agitator motor 42b, and an agitator head 42c. The flow control opening 62 is matched with the pressurizing device 72 for adjustment to carry out pouring, the pressurizing device 72 keeps certain pressure in the device during pouring, and the flow control opening 62 ensures the stability of pouring flow.
For example, the screening out multiple sets of second foams satisfying a first set condition from multiple sets of first foams based on an image processing technology includes:
respectively acquiring initial images of each group of first foams;
respectively carrying out image recognition processing on each initial image to obtain a problem foaming body comprising a foaming body cracking characteristic and/or a dead foam characteristic;
determining foams other than the problem foam as the plurality of sets of second foams.
Optionally, a foaming group which has no obvious cracking and dead foam defects and has good elasticity can be preliminarily selected by an observation and touch method.
And 120, cutting each group of second foaming bodies in the multiple groups of second foaming bodies according to a preset mode, so that each group of second foaming bodies respectively comprises multiple sub-foaming bodies.
In order to eliminate the influence of the extrusion at the two ends of the foam on the foam mass and the cross-sectional foam density, the preliminarily screened sets of second foams were subjected to parallel end face cutting at the positions of 25%,50% and 75% and compared, that is, the second foams were uniformly divided into four equal parts according to the length of the second foams to obtain 4 parts of sub-foams, as shown in fig. 10, which is a schematic diagram of uniformly dividing the second foams into four equal parts, and the second foams were cut into 4 parts of sub-foams 1010.
And step 130, evaluating the quality uniformity of each group of second foaming bodies according to the plurality of sub-foaming bodies respectively included in each group of second foaming bodies, and respectively obtaining the quality variance of each group of second foaming bodies.
The method comprises the following steps of evaluating the quality uniformity of each group of second foaming bodies according to a plurality of sub-foaming bodies respectively included in each group of second foaming bodies, and respectively obtaining the quality variance of each group of second foaming bodies, wherein the quality variance comprises the following steps:
the mass variance is determined as follows:
wherein m is 1 Mass of the first part of the foam, m 2 Mass m of the second part of the foam 3 Mass m of the third part of the foamed body 4 The mass of the fourth part of the foam,
the average value of the mass of the first part of sub-foam, the second part of sub-foam, the third part of sub-foam and the fourth part of sub-foam is shown,S 2 representing the quality variance.
Comparing the mass variance of the different sets of second foams, the smaller the mass variance, indicating that the smaller the mass deviation from the average mass for each sub-foam, the more uniform the foam quality.
And 140, evaluating the compactness of each group of second foaming bodies according to the plurality of sub-foaming bodies respectively included by each group of second foaming bodies, and respectively obtaining the average value of the foaming quantity of each group of second foaming bodies with the diameter larger than or equal to 2 mm.
Wherein, the compactness evaluation is carried out on the basis of the preliminarily screened second foaming body without obvious cracking and dead foam defects. Specifically, on a set section of each sub-foam, a plurality of reference areas having a diameter of 2cm are marked; determining a mean value of the number of blisters with a diameter greater than or equal to 2mm in said plurality of reference areas.
Alternatively, referring to fig. 11, the cross sections of the sub-foam body after the second foam body is cut, which are the first cross section 1110, the second cross section 1111 and the third cross section 1112, on the side close to the pouring gate, are selected. On the cross-section diameters of the bubble body which are perpendicular to each other, the five parts of the upper, lower, left, right and middle areas with the diameters of 2cm are selected for markingThe divided regions are respectively marked as a first region 1120, a second region 1130, a third region 1140, a fourth region 1150 and a fifth region 1160, and foams with a diameter of 2mm or more in each marked region are screened out by an electron microscope. The number of bubbles with a diameter of 2mm or more in the first region 1120 of the first cross-section 1110 is marked n 1 The number of bubbles having a diameter of 2mm or more in the second region 1130 of the first cross-section 1110 is denoted by n 2 The number of foams having a diameter of 2mm or more in the third region 1140 of the first cross-section 1110 is denoted by "n 3 The number of bubbles having a diameter of 2mm or more in the fourth region 1150 of the first cross-section 1110 is denoted by n 4 The number of foams having a diameter of 2mm or more in the fifth region 1160 of the first cross-section 1110 is denoted by n 5 . The mean of the number of bubbles screened on the first section 1110 with a diameter of 2mm or more is:
the number of foams having a diameter of 2mm or more in the first region 1120 of the second section 1111 is denoted by n 1 ', the number of foams having a diameter of 2mm or more in the second region 1130 of the second cross-section 1111 is denoted by "n 2 ', the number of foams having a diameter of 2mm or more in the third region 1140 of the second section 1111 is denoted by "n 3 ', the number of foams having a diameter of 2mm or more in the fourth region 1150 of the second cross-section 1111 is denoted by "n 4 ', the number of foams having a diameter of 2mm or more in the fifth region 1160 of the second cross-section 1111 is denoted by "n 5 '. The average value of the number of foams with the diameter of more than or equal to 2mm screened from the second section 1111 is as follows:
the number of foams having a diameter of 2mm or more in the first region 1120 of the third cross-section 1112 is denoted by n 1 '', the number of blisters with a diameter of 2mm or more in the second region 1130 of the third cross-section 1112 is marked n 2 '', the number of blisters with a diameter of 2mm or more in the third region 1140 of the third cross-section 1112 is denoted by n 3 '', the number of blisters with a diameter of 2mm or more in the fourth region 1150 of the third cross-section 1112 is marked n 4 '' and n denotes the number of foams having a diameter of 2mm or more in the fifth region 1160 of the third cross section 1112 5 ''. The average value of the number of foams with a diameter of 2mm or more screened on the third section 1112 is:
the average value of the number of foams with the diameter of more than or equal to 2mm in each group of the second foams is the average value of the number of foams with the diameter of more than or equal to 2mm on the first section 1110, the second section 1111 and the third section 1112 after each group of the second foams is cut:
the larger the average value of the screened foaming quantity on each section is, and the larger the average value of the screened foaming quantity on three sections is, the larger the foaming quantity of the overlarge foam holes is, and the uniformity and compactness of the foam holes are poorer.
And 150, determining a second foaming group with the mass variance smaller than a first threshold and/or the average value of the foaming quantity smaller than a second threshold as a target foaming group.
And step 160, determining the minimum value of the stirring time lengths respectively corresponding to the target foam components as the optimal stirring time length.
Summarizing, through comparing and evaluating a plurality of groups of foaming experimental results, a group of foaming groups which have no obvious cracking and dead foam defects in polyurethane foaming, have uniform foaming quality, compact foam holes and good elasticity and are short in used stirring time are selected, and the stirring time of the corresponding raw materials of the group is the determined optimal stirring time t of polyurethane foaming 1 。
Further, the method further comprises:
after stirring the polyurethane raw material according to the optimal stirring duration to obtain a mixed raw material, putting the mixed raw material into a foam lifting tester to obtain a change curve of the lifting height of foam and the reaction temperature along with time; and determining the optimal cream time according to the curvature of the change curve.
The cream time is from the beginning of mixing to the whitening of the mixed materials, and can be used for judging the initial reaction rate of the materials. When the raw materials are stirred and mixed and reach the milky white time, the color of the liquid surface becomes dark suddenly, then becomes white suddenly and starts to rise, and the time at this moment is the milky white time T. In order to obtain accurate cream time T, the polyurethane mixture obtained under the condition of stirring time T1 is put into a foam lifting tester, a change curve of the lifting height of foam and reaction temperature along with time is obtained, and the time corresponding to the change of obvious curvature when the two curves start to occur is used as the optimal cream time T of the raw materials. Illustratively, referring to the rise height versus reaction temperature curve of a foam as shown in FIG. 12, the optimum cream time T for the feedstock is determined as the time corresponding to the onset of significant curvature change in the two curves.
Further, the method further comprises:
determining the longest pouring time required for pouring the mixed raw materials into a dummy skin cavity to be filled according to the optimal stirring time and the optimal milk-white time; and determining the minimum pouring rate according to the longest pouring time.
In order to ensure that the foaming of the polyurethane does not affect the pouring, the pouring is completed before the starting material reaches the cream time T, the maximum pouring time T required in this case 2 Comprises the following steps: t is t 2 =T-t 1 Wherein, t 1 For an optimal stirring time. Thereby determining the minimum pouring rate v min ：v min =m/t 2 Wherein m is the mass of the mixed raw materials to be poured after stirring. Generally, after the raw materials are uniformly covered on the inner surface of the bottom of the mold, the raw materials are quickly lifted, the foam has better surface quality, and if the raw materials do not naturally flow to a certain position of the surface of the mold and then foam, but splash or even bottom penetration is generated, bubbles or dark holes are easily generated, so the maximum pouring rate of the raw materials is controlled, and the raw materials are prevented from splashing and bottom penetration in the pouring process. For the die to be poured, the vertical height of a pouring port of the die from the bottom of the inner surface of the die is H, and for the die with determined pouring height H, the raw materials to be poured are poured into a special dieIn the stirring pouring funnel, the pouring flow is controlled by adjusting a flow adjusting device at the bottom of the stirring pouring funnel, the pouring height is adjusted to be H by adopting a quantitative spraying mode, the pouring rate is increased by 5 percent on the basis of the minimum pouring rate every time, and the pouring rate is increased by 5 percent at the time t 2 The stirred raw materials are sequentially and quantitatively sprayed into the square round cup until the raw materials are splashed or bottom-penetrating in the pouring process, and the maximum pouring rate is determined as the last pouring rate v of the splashed or bottom-penetrating phenomenon max . The shortest pouring time is thus: t is t 2 ’=m/v max The casting time range thus determined is t 2 ’~ t 2 The normal foaming of the polyurethane raw material in the mold can be ensured as long as the pouring rate is adjusted to ensure that the pouring time is in the range, and the pouring process cannot be influenced. In the process of determining the maximum pouring rate, if the pouring at the minimum pouring rate still occurs, splashing or bottom penetration phenomenon still occurs, which indicates that the pouring rate is too high, namely the pouring time t 2 Too short of arrangement, requiring prolonged pouring time, in order to ensure t 1 +t 2 < T, it is necessary to shorten the stirring time T 1 Thus, the stirring speed was increased by 20% based on the initial stirring speed n, and the stirring time and the pouring time were determined again.
In general terms, the method further comprises:
and determining the maximum pouring rate for pouring the mixed raw materials into the cavity of the dummy skin to be filled according to the set pouring height.
The method provided by the embodiment of the invention is suitable for the stirring and pouring process of the raw materials of the skin muscle layer of the dummy, and can accurately determine the stirring time and the pouring time of the foaming raw materials of the skin muscle layer of the dummy, so that the feed liquid is uniformly mixed and fully foamed, and the skin muscle layer of the dummy with uniform and compact foam quality is obtained.
Referring to a schematic flow chart of fig. 13, the method for determining the stirring time (i.e. the optimal stirring duration) includes:
selecting muscle layer raw materials, determining the total mass M and the mixture ratio of the raw materials, setting the initial rotating speed n of a stirrer, setting initial stirring time a, setting three groups of stirring time a at intervals of 1-2s, for example, setting the stirring time a to 10s, setting the stirring time length of f1 to 4s, the stirring time length of f2 to 6s, the stirring time length of f3 to 8s, the stirring time length of f4 to 10s, the stirring time length of f5 to 12s, the stirring time length of f6 to 14s, and the stirring time length of f7 to 16s, and obtaining 7 groups of mixed raw materials after stirring is completed. Selecting 7 groups of raw materials to be poured for foaming, primarily screening high-quality foams, further evaluating the uniformity and compactness of the foams, determining the stirring time of the raw materials as T1, and determining the milk-white time T of the mixed raw materials.
Referring to a schematic flow chart of determining a pouring rate shown in fig. 14, the method specifically includes:
determining the longest pouring time T2= T-T1, calculating the minimum pouring rate Vmin according to the volume of the mixed raw materials, judging whether splashing or bottom penetration occurs in the pouring at the minimum rate, if so, increasing the rotating speed n of the stirrer, reacquiring the stirring time T1, if not, increasing the minimum pouring rate by 5% each time until splashing or bottom penetration occurs, taking the previous pouring rate as the maximum pouring rate Vmax, calculating the shortest pouring time T2', and finally determining the stirring time T1 and the pouring time T2' ~ T2.
Furthermore, the embodiment of the invention also provides a method for processing raw materials of the skin muscle layer of the collision dummy, which is characterized by comprising the following steps:
determining the total mass of a polyurethane foaming composite material and the proportion of two polyurethane raw materials according to the body part of the dummy to be filled, wherein the polyurethane foaming composite material consists of the two polyurethane raw materials;
respectively determining the respective mass of the two polyurethane raw materials according to the total mass and the ratio of the two polyurethane raw materials;
setting the rotating speed of a stirring device as a target rotating speed, setting the stirring time of the stirring device as an optimal stirring time, controlling the stirring device to start, and mixing and stirring the two polyurethane raw materials with the quality through the stirring device to obtain mixed raw materials;
determining a target pouring rate according to the set maximum pouring rate and the set minimum pouring rate, wherein the target pouring rate is smaller than the set maximum pouring rate and larger than the set minimum pouring rate;
pouring the mixed raw materials into a mold corresponding to the body part according to the target pouring rate to obtain a skin muscle layer of the body part;
wherein the optimal stirring time length, the set maximum pouring rate and the set minimum pouring rate are determined based on the pretreatment method of the raw materials of the skin and muscle layer of the collision dummy.
Fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 15, the electronic device 400 includes one or more processors 401 and memory 402.
The processor 401 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device 400 to perform desired functions.
In one example, the electronic device 400 may further include: an input device 403 and an output device 404, which are interconnected by a bus system and/or other form of connection mechanism (not shown). The input device 403 may include, for example, a keyboard, a mouse, and the like. The output device 404 can output various information to the outside, including warning prompt information, braking force, and the like. The output devices 404 may include, for example, a display, speakers, a printer, and a communication network and its connected remote output devices, among others.
Of course, for simplicity, only some of the components of the electronic device 400 relevant to the present invention are shown in fig. 15, and components such as buses, input/output interfaces, and the like are omitted. In addition, electronic device 400 may include any other suitable components depending on the particular application.
In addition to the above methods and apparatus, embodiments of the invention may also be a computer program product comprising computer program instructions which, when executed by a processor, cause the processor to perform the steps of a method for pre-processing a raw material of a skin-muscle layer of a crash dummy as provided by any of the embodiments of the invention.
The computer program product may write program code for carrying out operations for embodiments of the present invention in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present invention may also be a computer-readable storage medium having stored thereon computer program instructions, which, when executed by a processor, cause the processor to perform the steps of a method for pre-processing a raw material for a skin-muscle layer of a collision dummy as provided by any of the embodiments of the present invention.
The computer-readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present application. As used in the specification and claims of this application, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, or apparatus comprising the element.
It is also noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used herein to denote an orientation or positional relationship, as illustrated in the accompanying drawings, for convenience in describing the present invention and to simplify the description, but are not intended to denote or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," "coupled," and the like are to be construed broadly and encompass, for example, both fixed and removable coupling or integral coupling; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (9)
1. A pretreatment method for raw materials of a skin muscle layer of a collision dummy is characterized by comprising the following steps:
on the basis of an image processing technology, screening multiple groups of second foaming bodies meeting a first set condition from multiple groups of first foaming bodies, wherein the multiple groups of first foaming bodies are obtained by respectively pouring multiple groups of mixed raw materials into a foaming device for foaming, the multiple groups of mixed raw materials are obtained by respectively mixing and stirring multiple groups of same polyurethane foaming combined materials under the conditions of the same environmental temperature, the same stirring speed and different stirring time periods, and the volume of the foaming device is the same as the volume of a cavity of the skin of a dummy to be filled;
cutting each group of second foaming bodies in the multiple groups of second foaming bodies according to a preset mode to enable each group of second foaming bodies to respectively comprise multiple sub-foaming bodies;
according to the plurality of sub-foaming bodies respectively included by each group of second foaming bodies, evaluating the quality uniformity of each group of second foaming bodies, and respectively obtaining the quality variance of each group of second foaming bodies;
according to the plurality of sub-foaming bodies respectively included by each group of second foaming bodies, evaluating the compactness of each group of second foaming bodies, and respectively obtaining the average value of the foaming quantity of each group of second foaming bodies with the diameter larger than or equal to 2 mm;
determining a second foaming group with the mass variance smaller than a first threshold value and/or the average value of the foaming quantity smaller than a second threshold value as a target foaming group;
determining the minimum value of the stirring time lengths respectively corresponding to the target foam components as the optimal stirring time length;
the image processing technology-based method for screening multiple groups of second foaming bodies meeting first set conditions from multiple groups of first foaming bodies comprises the following steps:
respectively acquiring initial images of each group of first foams;
respectively carrying out image recognition processing on each initial image to obtain a problem foaming body comprising a foaming body cracking characteristic and/or a dead foam characteristic;
determining foams other than the problem foam as the plurality of sets of second foams.
2. The method of claim 1, wherein the evaluating the uniformity of the quality of each set of the second foams according to the plurality of sub-foams each set of the second foams respectively comprises, and the obtaining the variance of the quality of each set of the second foams respectively comprises:
the mass variance is determined as follows:
wherein m is 1 Mass of first part of the foam, m 2 Mass m of the second part of the foam 3 Is the mass of the third part of the foam, m 4 The mass of the fourth part of the foam,
showing the first part of the subpaoamed body and the second part of the subpaoamed bodyThe average of the masses of the third part of the sub-foam and the fourth part of the sub-foam,S 2 representing the quality variance.
3. The method of claim 1, wherein the evaluating the compactness of each group of second foams according to the plurality of sub-foams each group of second foams comprises respectively, and the obtaining the average value of the foaming number of each group of second foams with the diameter of more than or equal to 2mm comprises:
marking a plurality of reference areas with the diameter of 2cm on the set section of each sub-foaming body;
determining a mean value of the number of blisters with a diameter greater than or equal to 2mm in said plurality of reference areas.
4. The method of claim 1, further comprising:
after stirring the polyurethane raw material according to the optimal stirring duration to obtain a mixed raw material, putting the mixed raw material into a foam lifting tester to obtain a change curve of the lifting height of foam and the reaction temperature along with time;
and determining the optimal cream time according to the curvature of the change curve.
5. The method of claim 4, further comprising:
determining the longest pouring time required for pouring the mixed raw materials into a dummy skin cavity to be filled according to the optimal stirring time and the optimal milk-white time;
and determining the minimum pouring rate according to the longest pouring time.
6. The method of claim 5, further comprising:
and determining the maximum pouring speed for pouring the mixed raw materials into the cavity of the skin of the dummy to be filled according to the set pouring height.
7. A method for processing raw materials of a skin muscle layer of a collision dummy is characterized by comprising the following steps:
determining the total mass of a polyurethane foaming composite material and the proportion of two polyurethane raw materials according to the body part of the dummy to be filled, wherein the polyurethane foaming composite material consists of the two polyurethane raw materials;
respectively determining the respective mass of the two polyurethane raw materials according to the total mass and the ratio of the two polyurethane raw materials;
setting the rotating speed of a stirring device as a target rotating speed, setting the stirring time of the stirring device as an optimal stirring time, controlling the stirring device to start, and mixing and stirring the two polyurethane raw materials with the quality through the stirring device to obtain mixed raw materials;
determining a target pouring rate according to the set maximum pouring rate and the set minimum pouring rate;
pouring the mixed raw materials into a mold corresponding to the body part according to the target pouring rate to obtain a skin muscle layer of the body part;
wherein the optimal stirring period, the set maximum pouring rate and the set minimum pouring rate are determined based on the method of claim 6.
8. An electronic device, characterized in that the electronic device comprises:
a processor and a memory;
the processor is configured to perform the method steps of any of claims 1 to 7 by calling a program or instructions stored by the memory.
9. A computer-readable storage medium, characterized in that it stores a program or instructions that cause a computer to perform the method steps of any of claims 1 to 7.
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| EP3482903B1 (en) * | 2016-07-06 | 2024-02-28 | Kaneka Corporation | Foaming particle manufacturing device using polyolefin-based resin particle and method for manufacturing said foaming particle |
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