CN114633443B - Optimization method of injection molding process of complex diamond-shaped grating - Google Patents
Optimization method of injection molding process of complex diamond-shaped grating Download PDFInfo
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- CN114633443B CN114633443B CN202210239054.8A CN202210239054A CN114633443B CN 114633443 B CN114633443 B CN 114633443B CN 202210239054 A CN202210239054 A CN 202210239054A CN 114633443 B CN114633443 B CN 114633443B
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005457 optimization Methods 0.000 title abstract description 8
- 239000003292 glue Substances 0.000 claims abstract description 90
- 238000005034 decoration Methods 0.000 claims abstract description 56
- 239000000155 melt Substances 0.000 claims abstract description 43
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 23
- 239000010432 diamond Substances 0.000 claims abstract description 23
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 17
- 238000012805 post-processing Methods 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 12
- 229910052709 silver Inorganic materials 0.000 description 12
- 239000004332 silver Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 230000004927 fusion Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 238000005429 filling process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- 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
- B29C45/76—Measuring, controlling or regulating
-
- 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
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3044—Bumpers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses an optimization method of a complex diamond grid injection molding process, which comprises the following steps: s1, analyzing the structure of a complex diamond grid; s2, setting a gate position and opening time; s3, setting the flow direction of the melt at the grid decoration body 12; and S4, exhausting the position of the glue reducing groove 121. By adopting the optimization method of the injection molding process of the complex diamond-shaped grating, the defects of the appearance surface of the product are greatly eliminated, the qualification rate of the product is greatly improved, and the labor cost of post-processing defects is reduced.
Description
Technical Field
The invention relates to the technical field of injection molding, in particular to an optimization method of a complex diamond grid injection molding process.
Background
To meet the aesthetic demands of people, more and more host factories begin to use plastic covering parts with large area and complex curved surfaces on automobiles, and a front bumper is one of them. One of the popular models of automobile front bumpers is a model with diamond-shaped gratings with small bosses, and compared with a paint spraying process and an electroplating process, the high-gloss spraying-free process is more and more popular in the industry, so that the cost can be effectively saved.
At present, a host factory only limits the appearance surface (namely, A surface) of the front bumper to be molded, and the inner surface (namely, B surface) of the front bumper is designed by a processing enterprise. At present, the traditional method of processing enterprises adopts the design principle of 'equal wall thickness' to design the inner surface and the corresponding structure according to the appearance surface modeling. However, the prior diamond-shaped grating with the small boss structure has a plurality of hole structures in the middle of the diamond-shaped grating with the small boss structure, so that the injection molding filling process can be greatly hindered, and the filling of the middle small boss area is very difficult. The wall thickness of the connecting ribs between the diamond-shaped grating and the small bosses is generally thinner, the wall thickness is equal to a crisscross small river on a die, and the connecting ribs are split after being fused, and are fused after being split, so that the melt flow is extremely disordered and disordered, mutually collided, poor in exhaust and the like, and appearance surface defects such as surface silver wires, surface white lines, surface cold materials, surface bubbles and the like are caused.
Therefore, the existing injection molding process cannot meet the requirement of manufacturing the complex diamond-shaped grid, and the problem is urgent to be solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides an optimization method of a complex diamond grid injection molding process.
The technical scheme is as follows:
the optimizing method of the injection molding process of the complex diamond-shaped grating is characterized by comprising the following steps of:
s1, analyzing structure of complex diamond grid
The two side surfaces of the complex diamond-shaped grating are respectively an appearance surface and an inner surface, the complex diamond-shaped grating consists of a plurality of diamond-shaped grating units distributed in an array manner, each diamond-shaped grating unit comprises a grating structure body with a diamond-shaped frame structure and grating decoration bodies arranged in the grating structure body, two ends of each grating decoration body are respectively connected with corresponding ends of the grating structure body in the long axis direction through a connecting rib, each grating decoration body is a flat boss structure extending along the long axis direction of the grating structure body, and the width of each grating decoration body in the short axis direction of the grating structure body gradually decreases from one side, which is close to the inner surface of the complex diamond-shaped grating, to one side, which is close to the appearance surface of the complex diamond-shaped grating;
s2, setting the gate position and the opening time
Setting the gate position at one end of the grid structure body in the long axis direction or one end of the grid structure body in the short axis direction, analyzing whether the gate position is reasonable or not by utilizing numerical simulation software, performing shot analysis on each gate after adjustment is finished, sequentially opening the gates by adopting a sequential valve hot runner control technology during injection molding, and opening the gates after the melt flows through the gates so as to ensure that the melt keeps forward flow;
S3, setting the flow direction of the melt at the grid decoration body
Firstly, arranging a glue reducing groove on one side of the grid decoration body, which is close to the inner surface of the complex diamond-shaped grid, so that the cross section of the grid decoration body, which is perpendicular to the long axis direction of the grid structure body, is in a V-shaped structure, guiding the melt to the bottom of the glue reducing groove of the grid decoration body, and simultaneously preventing the melt from flowing towards the notch direction of the glue reducing groove, thereby fusing the melt at the bottom of the glue reducing groove firstly, and fusing the melt to the notch of the glue reducing groove gradually;
S4, exhausting the glue reducing groove
The injection mold is provided with a plurality of exhaust inserts, each glue reducing groove at least corresponds to one exhaust insert, each exhaust insert is perpendicular to the long axis direction of the corresponding glue reducing groove, and the outer edges of the two sides of each exhaust insert are respectively connected with the groove walls of the two sides of the corresponding glue reducing groove.
As preferable: in the step S3, the structure of the grid decoration body is optimized as follows:
the grating decoration body consists of an adhesive reducing groove approximate plane and an adhesive reducing groove special-shaped curved surface which are respectively positioned at two sides of the adhesive reducing groove, and the thicknesses of the adhesive reducing groove approximate plane and the adhesive reducing groove special-shaped curved surface gradually decrease from one side close to the appearance surface of the complex diamond grating to one side close to the inner surface of the complex diamond grating;
the special-shaped curved surface of the glue reducing groove comprises a special-shaped surface middle part positioned at the middle position and special-shaped surface end parts positioned at two ends of the special-shaped surface middle part respectively, the glue reducing groove approximate plane, the special-shaped surface middle part and the special-shaped surface end parts are of thin plate structures, the two special-shaped surface end parts obliquely extend to the corresponding ends of the glue reducing groove approximate plane from the corresponding ends of the special-shaped surface middle part respectively, the thickness of the special-shaped surface middle part along the long axis direction of the grid structure is the same, the thickness of the special-shaped surface end parts along the long axis direction of the grid structure gradually increases towards the direction far away from the special-shaped surface middle part, and the thickness of the glue reducing groove approximate plane along the long axis direction of the grid structure gradually increases from the middle to the two ends.
By adopting the structure, the melt can be easily and effectively led to one side of the bottom of the glue reducing groove, and the melt is ensured to flow from the groove bottom to the groove opening direction, so that the defects of surface silver wires, surface white lines, surface cold materials, surface bubbles and the like can be ensured to basically appear on the inner surface instead of the appearance surface.
Preferably, in the step S4, each glue reducing groove corresponds to three exhaust inserts, one side outer edges of the three exhaust inserts are connected with the inner surface of the approximate plane of the glue reducing groove, and the middle part of the special-shaped surface of each glue reducing groove and the inner surfaces of the two special-shaped surface ends are respectively connected with the other side outer edges of the three exhaust inserts.
By adopting the structure, the exhaust capacity of each position of the glue reducing groove can be ensured, the problem of poor exhaust is avoided, and therefore, the defects of the appearance surface are reduced.
As preferable: the three exhaust inserts in the glue reducing groove are arranged at equal intervals.
By adopting the structure, the exhaust capacity of the glue reducing groove during injection molding can be further improved, the molding quality is improved, and appearance surface flaws are reduced.
As preferable: the groove bottom of the glue reducing groove forms a transverse groove bottom extending along the long axis direction of the grid structure body.
By adopting the structure, the glue is added at the bottom of the glue reducing groove to form the transverse groove bottom, so that the flow of the melt at the groove bottom during injection molding is further accelerated, the melt at the groove bottom is further ensured to be fused before the groove opening, and further, the defects of silver wires, white marks on the surface, cold materials on the surface, bubbles on the surface and the like can only appear on the inner surface instead of the appearance surface.
As preferable: the side surface of the grid decoration body, which is close to the inner surface of the complex diamond-shaped grid, is lower than the side surface of the grid structure body, which is close to the inner surface of the complex diamond-shaped grid, and the connecting ribs extend to the side surface of the grid decoration body, which is close to the inner surface of the complex diamond-shaped grid, from the corresponding end of the grid structure body in the long axis direction in an inclined manner.
By adopting the structure, the melt is favorably led to one side of the bottom of the glue reducing groove, the flow of the melt from the bottom of the groove to the direction of the notch is ensured, and further, the defects of surface silver wires, surface white lines, surface cold materials, surface bubbles and the like can only appear on the inner surface instead of the appearance surface.
As preferable: after the connecting ribs are connected with the grid decoration body, branch connecting parts which extend to the approximate plane and the end parts of the special-shaped surfaces of the glue reducing grooves are formed, and the thickness of the branch connecting parts gradually decreases towards the direction away from the connecting ribs.
By adopting the structure, the bifurcation connecting part is of a transition structure with gradual thinning, and is matched with the structure at the corresponding position of the grille decoration body, so that the melt can be better guided to one side of the groove bottom of the glue reducing groove, the melt is ensured to flow from the groove bottom to the groove opening direction, and further the defects such as surface silver wires, surface white lines, surface cold materials, surface bubbles and the like can only appear on the inner surface instead of the appearance surface.
As preferable: the surface of the grid decoration body, which is close to the appearance surface of the complex diamond-shaped grid, protrudes out of the surface of the grid structure body, which is close to the appearance surface of the complex diamond-shaped grid, and the surface of the connecting rib, which is close to the appearance surface of the complex diamond-shaped grid, is lower than the surface of the grid structure body, which is close to the appearance surface of the complex diamond-shaped grid.
By adopting the structure, the appearance surface is more beautiful and more elegant.
As preferable: cylindrical connecting points which are in cylindrical structures are arranged at the two ends of the grid structure body in the short axis direction and the two ends of the grid structure body in the long axis direction, which are close to one side of the inner surface of the complex diamond-shaped grid, and each cylindrical connecting point can be used as a pouring gate.
By adopting the structure, any cylindrical connecting point can be used as a pouring gate, so that the degree of freedom of the design of the injection mold is larger, and the process difficulty is reduced.
As preferable: the protruding heights of the grid structure body and the connecting ribs on one side close to the inner surface of the complex diamond-shaped grid are gradually increased toward a direction away from the adjacent cylindrical connecting point, then the grid structure body and the connecting ribs are kept for one section, and finally the protruding heights are gradually reduced and extend to the next cylindrical connecting point.
With the structure, the flow rate of the melt is increased as much as possible, and the appearance quality is reduced.
Compared with the prior art, the invention has the beneficial effects that:
According to the optimization method of the complex diamond grid injection molding process, through analyzing the structure of the diamond grid, the gate position and the opening time are skillfully designed and set, so that the melt keeps forward flowing, the problems of disorder and mutual collision of the melt are avoided, meanwhile, the flowing direction of the melt at the grid decoration body is controlled, the melt is ensured to flow from the groove bottom to the groove opening direction, the defects of surface silver wires, surface white lines, surface cold materials, surface bubbles and the like are ensured to basically appear on the inner surface rather than the appearance surface (the inner surface is basically not appeared), the glue reducing groove position is effectively exhausted, and the molding quality of the grid decoration body is ensured, so that the process greatly eliminates the appearance surface defects of products through the improvement, greatly improves the qualification rate of the products, and reduces the labor cost of post-processing defects.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic perspective view of the inner surface of a complex diamond grid;
FIG. 3 is a schematic plan view of the inner surface of a complex diamond grid;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;
FIG. 5 is a schematic perspective view of the appearance of a complex diamond grid;
FIG. 6 is a schematic view of melt fill trend at the grid trim of a complex diamond grid employing the inventive method;
FIG. 7 is a schematic view of melt fill trend at the grid trim of a complex diamond grid employing a conventional equal wall thickness structure;
FIG. 8 is a schematic view of a gate position.
Detailed Description
The invention is further described below with reference to examples and figures.
As shown in fig. 1, an optimization method of an injection molding process of a complex diamond grid comprises the following steps:
S1, analyzing the structure of a complex diamond grid;
s2, setting a gate position and opening time;
s3, setting the flow direction of the melt at the grid decoration body 12;
and S4, exhausting the position of the glue reducing groove 121.
For step S1, please refer to fig. 5, the surface of the grid decoration body 12 near the complex diamond-shaped grid appearance surface protrudes from the surface of the grid structure body 11 near the complex diamond-shaped grid appearance surface, the surface of the connecting rib 13 near the complex diamond-shaped grid appearance surface is lower than the surface of the grid structure body 11 near the complex diamond-shaped grid appearance surface, and the appearance surface is more beautiful and more air. The two side surfaces of the complex diamond-shaped grating are appearance surfaces and inner surfaces respectively, the complex diamond-shaped grating is composed of a plurality of diamond-shaped grating units 1 distributed in an array mode, each diamond-shaped grating unit 1 comprises a grating structure body 11 with a diamond-shaped frame structure and a grating decoration body 12 arranged in the grating structure body 11, two ends of each grating decoration body 12 are respectively connected with corresponding ends of the grating structure body 11 in the long axis direction through a connecting rib 13, each grating decoration body 12 is of a flat boss structure extending along the long axis direction of the grating structure body 11, and the width of each grating decoration body 12 in the short axis direction of the grating structure body 11 gradually decreases from one side close to the inner surface of the complex diamond-shaped grating to one side close to the appearance surface of the complex diamond-shaped grating.
The traditional method adopts the design principle of 'equal wall thickness' to design the inner surface and the corresponding structure according to the appearance surface modeling, namely: the side of the grid decoration body 12, which is close to the inner surface of the complex diamond-shaped grid, is provided with the glue reducing groove 121, the groove wall thickness of each part of the glue reducing groove 121 is kept constant, while the prior complex diamond-shaped grid has a plurality of hole structures around the grid decoration body 12, the injection molding filling process can be greatly hindered, and the filling of the grid decoration body 12 is very difficult. The wall thickness of the connecting ribs 13 between the grid structure 11 and the grid decoration 12 is generally thinner, the wall thickness is equal to a crisscrossed small river on a die, the flow is split after fusion, and the flow is fused after the fusion, so the split and the continuous flow are easy to disorder and disorder, mutually collide, exhaust failure and the like, and as shown in fig. 7, the conventional diamond grid structure with equal wall thickness is in the middle position of the bottom of the glue reducing groove 121 due to the structural design, and the fusion position causes the appearance surface defects of the complex diamond grid such as surface silver wires, surface white lines, surface cold materials, surface bubbles and the like.
For step S2, specifically, please refer to fig. 8, the gate position is set at one end of the grid structure 11 in the long axis direction or one end of the grid structure in the short axis direction, then numerical simulation software is used to analyze whether the gate position is reasonable, after adjustment, each gate is shot and analyzed, finally, the gate is opened sequentially by adopting a sequential valve hot runner control technology during injection molding, and the melt is opened after flowing through the gate, so that the melt keeps flowing forward, and the problems of disorder and mutual collision of the melt are avoided.
Referring to fig. 2, 3 and 8, cylindrical connection points 14 with cylindrical structures are respectively arranged at both ends of the grating structure body 11, which are close to the inner surface of the complex diamond-shaped grating, in the short axis direction and both ends of the grating structure body, in the long axis direction, and each cylindrical connection point 14 can be used as a gate, so that the degree of freedom of the design of the injection mold is larger, and the process difficulty is reduced.
For step S3, specifically, referring to fig. 2-6, firstly, a glue reducing groove 121 is disposed on one side of the grid decoration body 12 close to the inner surface of the complex diamond-shaped grid, so that the cross section of the grid decoration body 12 perpendicular to the long axis direction of the grid structure body 11 is in a V-shaped structure, then the melt is guided to the bottom of the glue reducing groove 121 of the grid decoration body 12, and meanwhile, the melt is prevented from flowing towards the notch direction of the glue reducing groove 121, so that the melt is fused at the bottom of the glue reducing groove 121, and then gradually fused to the notch of the glue reducing groove 121. For this purpose, the structure of the grill decoration 12 is optimized as:
The grid decoration body 12 is composed of a glue reducing groove approximate plane 122 and a glue reducing groove special-shaped curved surface 123 which are respectively positioned on two sides of the glue reducing groove 121, wherein the thicknesses of the glue reducing groove approximate plane 122 and the glue reducing groove special-shaped curved surface 123 gradually decrease from one side close to the appearance surface of the complex diamond grid to one side close to the inner surface of the complex diamond grid, so that the flow of the groove bottom of the glue reducing groove 121 is quickened, the notch position of the glue reducing groove 121 forms choked flow, the flow speed is slowed down, the melt at the groove bottom is guaranteed to be fused before the notch, and further the defects of surface silver wires, surface white lines, surface cold materials, surface bubbles and the like are guaranteed to only appear on the inner surface of the grid decoration body 12, but not to appear on the non-appearance surface of the grid decoration body 12.
Similarly, the glue reducing groove special-shaped curved surface 123 includes a special-shaped surface middle portion 123a located at a middle position and special-shaped surface end portions 123b located at two ends of the special-shaped surface middle portion 123a, the glue reducing groove approximate plane 122, the special-shaped surface middle portion 123a and the special-shaped surface end portions 123b are all of thin plate structures, the two special-shaped surface end portions 123b extend obliquely from corresponding ends of the special-shaped surface middle portion 123a to corresponding ends of the glue reducing groove approximate plane 122 respectively, thicknesses of the special-shaped surface middle portion 123a along a long axis direction of the grid structure 11 are the same, thicknesses of the special-shaped surface end portions 123b along the long axis direction of the grid structure 11 are gradually increased towards a direction away from the special-shaped surface middle portion 123a, and thicknesses of the glue reducing groove approximate plane 122 along the long axis direction of the grid structure 11 are gradually increased from the middle to the two ends. Referring to fig. 6, through this design, the flow of the groove bottom of the glue reducing groove 121 is also accelerated, the choke is formed at the groove opening of the glue reducing groove 121, the flow speed is slowed down, especially the choke at the middle position of the groove opening of the glue reducing groove 121 is maximized, so that the final fusion position is just at the position, thereby ensuring that the fusion of the melt at the groove bottom is realized before the groove opening, and further ensuring that defects such as surface silver wires, surface white lines, surface cold materials, surface bubbles and the like can only appear on the inner surface of the grid decoration body 12, and cannot appear on the non-external surface of the grid decoration body 12.
Further, referring to fig. 4, the groove bottoms of the glue reducing grooves 121 form lateral groove bottoms 121a extending in the long axis direction of the grill structure 11. The lateral groove bottom 121a is formed by adding glue at the groove bottom of the glue reducing groove 121, so that the flow of the melt at the groove bottom during injection molding is further accelerated, the melt at the groove bottom is further ensured to be fused before the groove opening, and further, the defects of silver wires, white marks on the surface, cold materials on the surface, bubbles on the surface and the like can only appear on the inner surface instead of the appearance surface are further ensured. In addition, the glue is added to the bottom 121a of the transverse groove by 0.3mm, the thinnest part in the middle of the notch of the approximate plane 122 of the glue reducing groove is reduced to 1mm, and meanwhile, the notch position in the middle 123a of the special-shaped surface is also reduced to 1mm, so that the melt at the bottom of the groove is further ensured to be fused before the notch, and the appearance quality problem of the appearance surface is avoided.
Further, referring to fig. 2, a side surface of the grid decoration body 12 adjacent to the inner surface of the complex diamond-shaped grid is lower than a side surface of the grid structure body 11 adjacent to the inner surface of the complex diamond-shaped grid, and the connecting ribs 13 extend obliquely from the corresponding ends of the grid structure body 11 in the long axis direction to a side surface of the grid decoration body 12 adjacent to the inner surface of the complex diamond-shaped grid. This design facilitates directing the melt to the groove bottom side of the glue reducing groove 121, ensuring that the melt flows from the groove bottom to the groove opening direction, further ensuring that defects such as surface silver wires, surface white marks, surface coldness, surface bubbles, etc. can only occur on the inner surface instead of the outer surface.
Referring to fig. 2 and 3, after the connecting rib 13 is connected with the grid decoration body 12, a bifurcation connecting portion 131 extending to the approximate plane 122 of the glue reducing groove and the end 123b of the special-shaped surface is formed, and the thickness of the bifurcation connecting portion 131 gradually decreases toward a direction away from the connecting rib 13. The bifurcation connecting part 131 is a transition structure with gradual thinning, and is matched with a structure at a corresponding position of the grille decoration body 12, so that the melt can be better guided to one side of the groove bottom of the glue reducing groove 121, the flow of the melt from the groove bottom to the groove opening direction is ensured, and further, the defects such as surface silver wires, surface white lines, surface cold materials, surface bubbles and the like can only appear on the inner surface instead of the appearance surface.
The protruding heights of the grid structure 11 and the connecting ribs 13 on the side close to the inner surface of the complex diamond-shaped grid gradually increase toward the direction away from the adjacent cylindrical connecting points 14, and then the flow of the melt is increased as much as possible, so that the appearance quality is reduced.
Referring to fig. 2,3 and 5, the arc transition is adopted between the middle part 123a and the end part 123b of the special-shaped surface, so that the appearance is more attractive, the flow of the melt is smoother, and the appearance problem is reduced.
Specifically, in step S4, a plurality of exhaust inserts are disposed on the injection mold, so that each glue reducing groove 121 corresponds to at least one exhaust insert, each exhaust insert is perpendicular to the long axis direction of the corresponding glue reducing groove 121, and two outer edges of each exhaust insert are respectively connected with two side groove walls of the corresponding glue reducing groove 121. By effectively exhausting the positions of the glue reducing grooves 121, the molding quality of the grid decoration body 12 is ensured.
In this embodiment, each glue reducing groove 121 corresponds to three air exhaust inserts, one side outer edge of each air exhaust insert is connected with the inner surface of the approximate plane 122 of the glue reducing groove, and the inner surfaces of the middle part 123a of the special-shaped surface of each glue reducing groove 121 and the two end parts 123b of the special-shaped surface are respectively connected with the other side outer edges of the three air exhaust inserts, so that the air exhaust capability of each position (namely, the position of the middle part 123a of the special-shaped surface and the position of the end parts 123b of the two special-shaped surfaces) of the glue reducing groove 121 can be ensured, the problem of poor air exhaust is avoided, and appearance surface flaws are reduced.
Further, the three exhaust inserts in the glue reducing groove 121 are arranged at equal intervals, so that the exhaust capacity of the glue reducing groove 121 during injection molding can be further improved, the molding quality is improved, and appearance surface flaws are reduced.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. The optimizing method of the injection molding process of the complex diamond-shaped grating is characterized by comprising the following steps of:
S1, analyzing the structure of a complex diamond grid;
s2, setting a gate position and opening time;
s3, setting the flow direction of the melt at the grid decoration body;
S4, exhausting the position of the glue reducing groove;
In the step S1, one side surface of the grid decoration body, which is close to the complex diamond-shaped grid appearance surface, protrudes out of one side surface of the grid structure body, which is close to the complex diamond-shaped grid appearance surface, and one side surface of the connecting rib, which is close to the complex diamond-shaped grid appearance surface, is lower than one side surface of the grid structure body, which is close to the complex diamond-shaped grid appearance surface; the two side surfaces of the complex diamond-shaped grating are respectively an appearance surface and an inner surface, the complex diamond-shaped grating consists of a plurality of diamond-shaped grating units distributed in an array manner, each diamond-shaped grating unit comprises a grating structure body with a diamond-shaped frame structure and grating decoration bodies arranged in the grating structure body, two ends of each grating decoration body are respectively connected with corresponding ends of the grating structure body in the long axis direction through a connecting rib, each grating decoration body is a flat boss structure extending along the long axis direction of the grating structure body, and the width of each grating decoration body in the short axis direction of the grating structure body gradually decreases from one side close to the inner surface of the complex diamond-shaped grating to one side close to the appearance surface of the complex diamond-shaped grating;
in the step S2, the gate position is arranged at one end of the grid structure body in the long axis direction or one end of the grid structure body in the short axis direction, numerical simulation software is utilized to analyze whether the gate position is reasonable or not, after adjustment is completed, each gate is subjected to shot analysis, and finally, a sequential valve hot runner control technology is adopted to sequentially open the gates during injection molding, and after melt flows through the gates, the gates are opened;
Cylindrical connecting points with cylindrical structures are arranged at the two ends of the grid structure body in the short axis direction and the two ends of the grid structure body in the long axis direction, which are close to one side of the inner surface of the complex diamond-shaped grid, and each cylindrical connecting point can be used as a pouring gate;
In the step S3, firstly, a glue reducing groove is formed in one side, close to the inner surface of the complex diamond-shaped grating, of the grating decoration body so that the cross section, perpendicular to the long axis direction of the grating structure body, of the grating decoration body is in a V-shaped structure, then melt is guided to the groove bottom of the glue reducing groove of the grating decoration body, and meanwhile, the melt is prevented from flowing towards the groove opening direction of the glue reducing groove, so that the melt is fused at the groove bottom of the glue reducing groove first and then gradually fused to the groove opening of the glue reducing groove;
The structure of the grille decoration body is as follows:
the grating decoration body consists of an adhesive reducing groove approximate plane and an adhesive reducing groove special-shaped curved surface which are respectively positioned at two sides of the adhesive reducing groove, and the thicknesses of the adhesive reducing groove approximate plane and the adhesive reducing groove special-shaped curved surface gradually decrease from one side close to the appearance surface of the complex diamond grating to one side close to the inner surface of the complex diamond grating;
The special-shaped curved surface of the glue reducing groove comprises a special-shaped surface middle part positioned at the middle position and special-shaped surface end parts positioned at two ends of the special-shaped surface middle part, the special-shaped surface middle part and the special-shaped surface end parts are of thin plate structures, the two special-shaped surface end parts extend to the corresponding ends of the special-shaped surface approximate plane obliquely from the corresponding ends of the special-shaped surface middle part respectively, the thickness of the special-shaped surface middle part along the long axis direction of the grid structure body is the same, the thickness of the special-shaped surface end parts along the long axis direction of the grid structure body is gradually increased towards the direction away from the special-shaped surface middle part, and the thickness of the special-shaped surface approximate plane along the long axis direction of the grid structure body is gradually increased from the middle to the two ends;
the bottom of the glue reducing groove forms a transverse groove bottom extending along the long axis direction of the grid structure body; forming a transverse groove bottom by adding glue at the groove bottom position of the glue reducing groove; and the glue is added to the bottom of the transverse groove by 0.3mm, the thinnest part in the middle of the groove opening of the approximate plane of the glue reducing groove is matched for reducing the glue to 1mm, and meanwhile, the position of the groove opening in the middle of the special-shaped surface is reduced to 1mm;
The surface of one side of the grid decoration body, which is close to the inner surface of the complex diamond-shaped grid, is lower than the surface of one side of the grid structure body, which is close to the inner surface of the complex diamond-shaped grid, and the connecting ribs extend to one side of the grid decoration body, which is close to the inner surface of the complex diamond-shaped grid, obliquely from the corresponding end of the grid structure body in the long axis direction;
After the connecting ribs are connected with the grid decoration body, branch connecting parts which extend to the approximate plane and the end parts of the special-shaped surfaces of the glue reducing grooves are formed, and the thickness of the branch connecting parts gradually decreases towards the direction away from the connecting ribs; the bifurcation connecting part is a transition structure with gradual thinning;
the protruding heights of the grid structure body and the connecting ribs, which are close to one side of the inner surface of the complex diamond-shaped grid, gradually increase toward the direction away from the adjacent cylindrical connecting point, and then a section of protruding height is maintained;
arc transition is adopted between the middle part of the special-shaped surface and the end part of the special-shaped surface;
in the step S4, a plurality of exhaust inserts are arranged on the injection mold, so that each glue reducing groove at least corresponds to one exhaust insert, each exhaust insert is perpendicular to the long axis direction of the corresponding glue reducing groove, and the outer edges of the two sides of each exhaust insert are respectively connected with the groove walls of the two sides of the corresponding glue reducing groove;
Each glue reducing groove corresponds to three exhaust inserts, the outer edges of one side of the three exhaust inserts are connected with the inner surface of the approximate plane of the glue reducing groove, and the middle part of the special-shaped surface of each glue reducing groove and the inner surfaces of the end parts of the two special-shaped surfaces are respectively connected with the outer edges of the other sides of the three exhaust inserts;
the three exhaust inserts in the glue reducing groove are arranged at equal intervals.
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