CN113815178B - Foaming forming die for soft sealing of parting surface - Google Patents
Foaming forming die for soft sealing of parting surface Download PDFInfo
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- CN113815178B CN113815178B CN202010564297.XA CN202010564297A CN113815178B CN 113815178 B CN113815178 B CN 113815178B CN 202010564297 A CN202010564297 A CN 202010564297A CN 113815178 B CN113815178 B CN 113815178B
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- sealing ring
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- 238000007789 sealing Methods 0.000 title claims abstract description 104
- 238000005187 foaming Methods 0.000 title claims abstract description 35
- 238000000465 moulding Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 29
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 6
- 238000012797 qualification Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 230000002950 deficient Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 10
- 230000035699 permeability Effects 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000010892 electric spark Methods 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 230000004308 accommodation Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000000692 Student's t-test Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000013400 design of experiment Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000556 factor analysis Methods 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 238000012353 t test Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- B29C44/58—Moulds
-
- 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
- B29C44/58—Moulds
- B29C44/588—Moulds with means for venting, e.g. releasing foaming gas
-
- 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
- B29L2031/3005—Body finishings
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a soft-sealing foaming forming die for a parting surface, which belongs to the technical field of die processing technology and comprises an upper die and a lower die which are folded to form a die, wherein a cavity and a parting surface to be processed are arranged in the die, the parting surface comprises an upper die parting surface and a lower die parting surface, one parting surface is provided with a U-shaped groove, the other parting surface is provided with an air groove, a hollow sealing ring is embedded in a containing space formed by the air groove and the U-shaped groove in a closing way, and the volume of the sealing ring is larger than that of the containing space. The height and thickness of the sealing ring are expandable through the restoring deformation force of the sealing ring, the gap of the parting surface can be made up, the upper parting surface and the lower parting surface are tightly attached, the pressing is more tight, a better sealing effect is realized, the flash phenomenon during product forming is reduced, the appearance of the product is attractive, the size is stable, the number of defective defects is small, the production cost is low, and the product qualification rate is greatly improved.
Description
Technical Field
The invention relates to the technical field of mold processing technology, in particular to a foaming molding mold for soft sealing of a parting surface.
Background
The back plate of the automobile seat is generally molded by a mold during production; the back plate mold for the automobile seat comprises an upper mold and a lower mold, wherein a workpiece is taken out when the upper mold and the lower mold are separated, and a casting gun is adopted to cast raw materials in a cavity of the lower mold when the upper mold and the lower mold are matched. Because the shape of the automobile backboard plastic part is complex, the parting surfaces of the upper die and the lower die of the die are complex curved surfaces; according to the production process requirements, the parting surface of the die needs to be sealed to seal the raw materials, and meanwhile, ventilation is allowed, but no leakage is caused. The parting surface is trimmed to obtain a good die, and the produced plastic part has no flash and does not need manual polishing.
The traditional mode of die matching is to install the die on the die carrier, repeatedly coat red lead powder on the parting surface, continuously mold and open the die, and after opening the die, grind and match the contact area with an alloy file or a pneumatic grinding wheel, finally achieve the joint of the parting surfaces of the upper die and the lower die. The mode has high requirements on the work bottoms of the master workers, long die matching time and poor effect; and the product has more flash due to the characteristics of the parting surface of part of the die product and the foaming raw material. At present, a spark parting surface machining process is commonly adopted, such as 'Shen Hong' and 'J' and 'electric machining, 1979 (05): 46-47' and 'Gu Zhiwei' and 'J' and 'mold manufacturing, 2014,14 (6): 82-83' are adopted, and the high points on the parting surface are gradually removed by continuous pulse spark discharge in a manner disclosed by the continuous pulse spark discharge, so that the contact area is continuously enlarged, and finally the requirement of cavity sealing is met. However, the electric spark machining process is more complex and has high cost; in addition, the die is often made of aluminum, the parting surface is easy to damage due to spark discharge, deformation, abrasion and the like of the parting surface can be caused in the long-term use process, burr flash is easy to appear on a product, appearance and precision are not guaranteed, follow-up trimming is needed, labor cost is increased, and the situation that the polishing and shaving edges are not clean can also cause hard spot protrusions to be generated on a coated seat, so that customer complaints are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the soft sealing foaming forming die for the parting surface, which is characterized in that the parting surface is extruded through the sealing ring to generate deformation, so that the upper parting surface and the lower parting surface are better jointed, the restoring deformation force of the sealing ring enables the height thickness of the sealing ring to be expandable, the gap between the parting surfaces can be made up, the upper parting surface and the lower parting surface are tightly jointed, the pressing is tighter, the better sealing effect is realized, the flash phenomenon during product forming is reduced, the product appearance is attractive, the size is stable, the defects are few, the production cost is low, and the product percent of pass is greatly improved. .
In order to achieve the above object, the present invention is specifically achieved by the following techniques:
the utility model provides a soft sealed foaming forming die of die joint, forms the mould after last mould and lower mould are closed, be equipped with the die cavity in the mould and wait to process the die joint, the die joint includes last mould die joint and lower mould die joint, at one of them the die joint is equipped with U type groove, another be equipped with the air tank on the die joint, the air tank with the accommodation space that the U type groove formed is embedded to be equipped with a hollow sealing washer, the volume of sealing washer is greater than the volume of accommodation space.
The technical scheme is adopted: the sealing ring body is not easy to deform in a non-working state; when the upper die and the lower die are clamped, the sealing ring is extruded, the hollow structure can be compressed under the action of a certain pressure to generate a certain deformation, so that the sealing surface of the sealing ring can be better attached to the parting surfaces of the upper die and the lower die, and a better sealing effect is realized; after foaming raw materials are poured, the parting surface is very easy to generate the problem of unsmooth lamination due to the principle of thermal expansion and cold contraction, so that foaming raw material melt flows into a parting surface gap to become flash, and the hollow sealing ring disclosed by the invention has a certain deformation due to interference fit with the air groove and the U-shaped groove during die assembly, and the height and the thickness of the hollow sealing ring can be expanded, so that the parting surface gap can be compensated in the foaming injection molding process, the parting surfaces of an upper die and a lower die are tightly laminated, the lamination is also more tight, the flash phenomenon during product molding is reduced, the workload of a subsequent trimming procedure is reduced, and finally, the product is attractive in appearance, stable in size, few in defective defects and low in production cost, and the product qualification rate is greatly improved. Secondly, in the foaming injection molding process, if the cavity pressure is too high, high-pressure gas in the cavity can be rapidly discharged through the gas tank, so that the exhaust performance is good, and the impact pressure of exhaust is effectively slowed down. Therefore, with the above structure, the adhesion and the air permeability of the parting surface of the foaming mold are ensured. In addition, the invention has simple structure, reduces the die changing cost and risk, and shortens the die changing period.
Further, the preset distance between the U-shaped groove and the boundary line between the parting surface and the cavity is 3-5 mm. The sealing ring is a certain distance away from the high-temperature melt of the cavity, the service life of the sealing ring is prolonged, and the sealing effect of the parting surface is influenced when the sealing ring is too far away.
Further, a chamfer is arranged on one side, facing the air groove, of the sealing ring. The parting surface can be better attached to the sealing surface of the sealing ring under the guiding action of the chamfer through the chamfer, and the generation of flash is prevented, so that the chamfer size is not easy to be too large, and the diameter is preferably 0.5-1.5 mm.
Further, the air groove has a groove width of 9-11 mm and a groove depth of 0.3-0.7 mm;
further, the air groove has a groove width of 10mm and a groove depth of 0.5mm.
Further, the sealing ring comprises a trapezoid section and an arc section which are in smooth transition, wherein the small-diameter end of the trapezoid section is connected with the arc section, and the length of the small-diameter end is the same as the diameter of the arc; the length of the small diameter end of the trapezoid section is 8-10 mm, the length of the large diameter end of the trapezoid section is 9-11 mm, the height of the trapezoid section is 4-6 mm, and the circular arc diameter of the circular arc section is 8-10 mm.
Further, the length of the small diameter end of the trapezoid section is 9mm, the length of the large diameter end of the trapezoid section is 10mm, the height of the trapezoid section is 5mm, the diameter of the arc section is 9mm, and the height of the sealing ring is 9.5mm.
Further, the U-shaped groove comprises a conical section and an arc section which are in smooth transition, wherein the large-diameter end of the conical section is connected with the arc section, and the length of the large-diameter end is the same as the diameter of the arc; the length of the small diameter end of the conical section is 8-9 mm, the length of the large diameter end of the conical section is 8-10 mm, the height of the conical section is 3-5 mm, and the diameter of the arc section is 8-10 mm.
Further, the length of the small diameter end of the conical section is 8.6mm, the length of the large diameter end of the conical section is 9mm, the height of the conical section is 4mm, the diameter of the arc section is 4.5mm, and the depth of the U-shaped groove is 8.5mm.
Furthermore, the sealing ring is 0.3-1.5 mm higher than the U-shaped groove.
Further, the sealing ring is higher than the U-shaped groove by 1mm.
The technical scheme is adopted: the tapered section of U type groove is the opposite structure with the trapezoidal section of sealing washer, can be better lock the sealing washer at U type inslot, improves sealed effect, simultaneously with the groove width setting of air groove be consistent with the trapezoidal section major diameter end length of sealing washer, can not influence the leakproofness of mould to the foaming material like this, still can increase the gas permeability of die joint. And each section of parameters of the U-shaped groove and the sealing ring are carefully selected, so that the sealing material and the exhaust of the parting surface sealing device are guaranteed to reach the optimal state at the same time, the problem that the parting surface is subjected to flash is effectively solved, the product prepared by adopting the foaming forming die with the soft sealing of the parting surface is little or no flash, and the processing quality of the product is greatly improved.
The beneficial effects of the invention are as follows:
1. the sealing ring is extruded to generate deformation, so that the upper parting surface and the lower parting surface are better attached, the restoring deformation force of the sealing ring enables the height thickness of the sealing ring to be expandable, the gap between the parting surfaces can be made up, the upper parting surface and the lower parting surface are tightly attached, the pressing is more tight, a better sealing effect is realized, the flash phenomenon during product forming is reduced, the appearance of the product is attractive, the size is stable, the defects are few, the production cost is low, and the product qualification rate is greatly improved. Secondly, when the pressure of the cavity is too high, high-pressure gas in the cavity can be rapidly discharged through the gas tank. Therefore, the adhesion and the air permeability of the parting surface of the foaming mold are ensured.
2. The tapered section of U type groove is the opposite structure with the trapezoidal section of sealing washer, can be better lock the sealing washer at U type inslot, improves sealed effect, simultaneously with the groove width setting of air groove be consistent with the trapezoidal section major diameter end length of sealing washer, can not influence the leakproofness of mould to the foaming material like this, still can increase the gas permeability of die joint. And the parameters of each section of the U-shaped groove and the sealing ring are carefully selected, so that the sealing material and the exhaust gas of the parting surface sealing device can reach the optimal state at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a foam molding die for soft sealing of a parting surface of embodiment 1;
fig. 2 is a schematic structural view of the upper die parting surface of embodiment 1;
fig. 3 is a schematic structural view of the lower die parting surface of embodiment 1;
FIG. 4 is a schematic structural view of a seal ring of embodiment 1;
in the figure, 1, an upper die; 2. a lower die; 3. a cavity; 4. a parting surface; 41. an upper die parting surface; 42. a lower die parting surface; 5. a U-shaped groove; 51. a conical section; 52. an arc section; 6. an air tank; 7. a seal ring; 71. a trapezoid section; 72. a circular arc section; 8. chamfering;
FIG. 5 is a T-test analysis graph of the effect of air pocket depth on product flash length;
FIG. 6 is a T-test analysis of the effect of air bag pressure on product flash length;
FIG. 7 is a T-test analysis of the effect of a parting surface seal on the flash length of a product;
FIG. 8 is a graph of the effect of DOE experiments on variation; the A is a Pareto diagram, the B is a main effect diagram, and the C is an interaction diagram;
FIG. 9 is a graph of the effect of DOE experiments on mean; the A is a Pareto diagram, the B is a main effect diagram, and the C is an interaction diagram;
FIG. 10 is a diagram of a product produced by using different sealing modes according to an application example; in the figure, A is an electric spark sealing mode, and in the figure, B is a soft sealing mode of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1
Referring to fig. 1-4, a soft-sealed foaming forming die for a parting surface 4 comprises an upper die 1 and a lower die 2, wherein the upper die 1 and the lower die 2 are folded to form a die, a cavity 3 and a parting surface 4 to be processed are arranged in the die, the parting surface 4 is arranged around the cavity 3, the parting surface 4 comprises the parting surface 4 of the upper die 1 and the parting surface 4 of the lower die 2, a cavity formed in the die after the parting surface 4 of the upper die 1 is jointed with the parting surface 4 of the lower die 2 is the cavity 3, a U-shaped groove 5 is arranged on one parting surface 4 at a position which is 3-5 mm away from the boundary line between the parting surface 4 and the cavity 3 by a preset distance (L6), a gas groove 6 is arranged on the other parting surface 4, a hollow sealing ring 7 is embedded in a containing space formed by the gas groove 6 and the U-shaped groove 5, namely, the center of the sealing ring 7 is provided with a hollow cavity with a circular section, and a hollow structure is formed; the appearance of sealing washer 7 with U type groove 5 looks adaptation, namely the appearance of sealing washer 7 is U-shaped structure, the volume of sealing washer 7 is greater than air tank 6 with U type groove 5 is involuted the volume of the accommodation space that forms, makes sealing washer 7 exceeds U type groove 5, and forms interference fit in the accommodation space. In a specific embodiment, the U-shaped groove 5 may be disposed on the parting surface 4 of the lower die 2, or may be disposed on the parting surface 4 of the upper die 1, and when the U-shaped groove is disposed on the parting surface 4 of the lower die 2, the air groove 6 is disposed on the parting surface 4 of the upper die 1, so that trace residues of the foaming raw material may appear in the upper die 1, which is inconvenient for manual cleaning and is beneficial for cleaning by a manipulator; when the U-shaped groove is arranged on the parting surface 4 of the upper die 1, the air groove 6 is arranged on the parting surface 4 of the lower die 2, and the foaming raw material remains on the lower die 2, so that the manual cleaning is facilitated, and the automatic cleaning is not facilitated. According to the working condition requirement, the U-shaped groove is preferably arranged on the parting surface 4 of the upper die 1, and the air groove 6 is arranged on the parting surface 4 of the lower die 2, as shown in fig. 1. The sealing ring 7 may be made of isoprene rubber (polyisoprene rubber), and in this embodiment, the sealing ring 7 is a gas phase silica gel sealing ring 7 (available from starlight technologies, inc., model number RBB-2420). The sealing ring 7 is provided with a chamfer 8 towards one side of the air groove 6, so that the lower parting surface 4 can be better attached to the bottom surface of the sealing ring 7 under the guiding action of the chamfer 8, the generation of flash is prevented, and the dimension of the chamfer 8 is preferably 0.5-1.5 mm in diameter.
The working principle of the invention is as follows: when upper and lower mould 2 compound die, sealing washer 7 receives the extrusion, produces the deformation, makes upper and lower die joint 4 laminate better, after filling foaming raw materials, die joint 4 because expend with heat and contract with cold appear the inseparable problem of pressfitting, then the resilience deformability of accessible sealing washer 7 makes its high thickness extension, make up die joint 4 clearance, make upper and lower die joint 4 laminate closely, the pressfitting also is inseparabler, realize better sealed effect, overlap phenomenon when reducing the product shaping, finally make the product outward appearance pleasing to the eye, stable in size, bad defect is few, low in production cost, very big improvement the product percent of pass. Secondly, when the pressure of the cavity 3 is too high, the high-pressure gas in the cavity 3 can be rapidly discharged through the gas groove 6. Thus, the adhesion and air permeability of the foaming mold parting surface 4 are ensured. In addition, the invention has simple structure, reduces the die changing cost and risk, and shortens the die changing period.
According to the working principle of the sealing ring 7: the adhesion and air permeability are related to the sum of the volumes of the seal ring 7, the U-shaped groove 5 and the air groove 6, i.e., the deformation amount of the seal ring 7 is limited by the above structure, and the adhesion and air permeability are affected. Since the upper and lower parting surfaces 4 are required to maintain not only good sealing effect but also good air permeability, in a further embodiment of the present invention, it is preferable to set the following: referring to fig. 3, the air groove 6 has a groove width (L1) of 9 to 11mm and a groove depth (D1) of 0.3 to 0.7mm. Referring to fig. 4, the sealing ring 7 includes a trapezoid section 71 and an arc section 72 with smooth transition, wherein the small diameter end of the trapezoid section 71 is connected with the arc section 72, and the length of the small diameter end is the same as the diameter of the arc; the large diameter end of the trapezoid section 71 is connected with the groove wall of the air groove 6, the length of the large diameter end is the same as the groove width of the air groove 6, the length (L2) of the small diameter end of the trapezoid section 71 is 8-10 mm, the length (L3) of the large diameter end of the trapezoid section 71 is 9-11 mm, the height of the trapezoid section 71 is 4-6 mm (D2), and the circular arc diameter (phi 1) of the circular arc section 72 is 8-10 mm. Referring to fig. 2, the U-shaped groove 5 includes a tapered section 51 and an arc section 52 with smooth transition, the large diameter end of the tapered section 51 is connected with the arc section 52, and the length of the large diameter end is the same as the diameter of the arc; the length (L4) of the small diameter end and the length (L5) of the large diameter end of the conical section 51 are respectively 8-9 mm and 8-10 mm, the height (D3) of the conical section 51 is 3-5 mm, and the arc diameter (phi 2) of the arc section 52 is 8-10 mm. The sealing ring 7 is 50.3-1.5 mm (D4) higher than the U-shaped groove.
In this embodiment, the air groove 6 has a groove width of 10mm and a groove depth of 0.5mm. The length of the small diameter end of the trapezoid section 71 is 9mm, the length of the large diameter end of the trapezoid section 71 is 10mm, the height of the trapezoid section 71 is 5mm, the circular arc diameter of the circular arc section 72 is 9mm, and the height of the sealing ring 7 is 9.5mm. The length of the small diameter end of the conical section 51 is 8.6mm, the length of the large diameter end of the conical section 51 is 9mm, the height of the conical section 51 is 4mm, the circular arc diameter of the arc section 52 is 4.5mm, and the groove depth of the U-shaped groove 5 is 8.5mm. The sealing ring 7 is higher than the U-shaped groove by 51mm.
The setting of above-mentioned structure, the toper section 51 of U type groove 5 and the trapezoidal section 71 of sealing washer 7 are the opposite structure, can be better lock sealing washer 7 in U type groove 5, improve sealed effect, set up the groove width of air groove 6 as the big footpath end length unanimous with the trapezoidal section 71 of sealing washer 7 simultaneously, can not influence the leakproofness of mould to the foaming material like this, still can increase the gas permeability of die joint 4. And the parameters of each section of the U-shaped groove 5 and the sealing ring 7 are carefully selected, so that the sealing material and the exhaust of the sealing device of the parting surface 4 can reach the optimal state at the same time.
Example 2 parameter optimization
Earlier analysis of air groove depth, air bag pressure and parting surface sealing are potentially important factors affecting flash length. More detailed parameter optimization was performed by further single factor analysis and DOE (DESIGN OF EXPERIMENT pilot design) experiments, using 2sample t-test analysis data. The length of the flash was measured using a vernier caliper.
1. Depth of air groove
The air groove depth determines the size of a channel for forming flash by the overflow of the foaming raw material from the die, the channel is too large, and a large amount of raw material can overflow from the air groove to cause abnormal product quality; too small a passage and insufficient mold displacement may result in product starvation. Thus, comparative experiments were performed using 0.5mm air cells and 1mm air cells, respectively. 30 pieces of automobile seat back panel plastic products were each produced, and the flash length (mm) of the products was measured, and the results are shown in Table 1 and FIG. 5.
TABLE 1 influence of air groove depth on product flash length
As can be seen from table 1 and fig. 5, the air groove depth has a significant effect on the product flash length. The air groove depth of 0.5mm can obviously reduce the flash length.
2. Air bag pressure
The pressure in the mold pushes the foaming material to flow everywhere to release the pressure. Because the parting surface of the die is a weak point, the binding force of the upper die and the lower die to the raw materials is weak, the foaming raw materials can escape, and flash is generated. 30 automotive seat back panel plastic products were each produced using air bag pressures of 1.5bar and 3bar, respectively, and the flash length (mm) of the products was measured, and the results are shown in table 2 and fig. 6.
TABLE 2 influence of air bag pressure on product flash length
As can be seen from table 2 and fig. 6, the air pocket pressure has a significant effect on the length of the product flash. The 3bar air bag pressure can obviously reduce the flash length.
3. Parting surface sealing mode
The clearance of the parting surface of the die influences the depth of flash, when the clearance of the upper die and the lower die is matched, foaming raw materials easily flow out of the clearance, when the dies are in interference fit, the matched part between the upper die and the lower die is easy to bend and deform, foaming raw materials are filled between the cavity of the parting surface and the highest point of the bent part, the flash is formed, and the higher the bending degree is, the higher the length of the flash is. A parting surface soft sealing mode of a common aluminum parting surface 0 in clearance fit, a U-shaped groove formed in an upper die parting surface, an air groove formed in a lower die parting surface, and a sealing ring filled in a containing space matched with the U-shaped groove and the air groove is selected, 30 automobile seat back plate plastic products are produced respectively, the flash length (mm) of the products is measured, and the results are shown in Table 3 and FIG. 7.
TABLE 3 influence of parting surface sealing means on the flash length of product
As can be seen from table 3 and fig. 7, the parting surface sealing manner has a significant effect on the length of the product flash. The soft seal of the parting surface can obviously reduce the flash length.
4. DOE experiment design
Three factors and two levels of the selected factors were subjected to 4 DOE experiments, the specific parameter settings are shown in table 4 and the experimental results are shown in fig. 8-9.
TABLE 4 DOE experimental parameter settings
The effect of DOE experiments on the deterioration was analyzed to obtain the results shown in fig. 8, and as is clear from Pareto chart (fig. 8A), only C (upper die parting plane U-groove depth) had a significant effect on the deviation. The interaction diagram (figure 8C) shows that the factors have no interaction in the DOE experiment, and the main effect diagram (figure 8B) shows that the deviation is smaller when C (the U-shaped groove depth of the upper die parting surface) is 8.5mm.
The effect of DOE experiment on the mean value is used to obtain the result shown in FIG. 9, and as can be seen from the Pareto chart (FIG. 9A) of the normalization effect in DOE experiment, A, B, C and BC have significant effects on Yp (flash length at air groove), wherein the effect of C (upper die parting surface U-shaped groove depth) is most significant; as can be seen from the interaction diagram (fig. 9C), the three factors are non-interacting. From the main effect diagram (fig. 9B), it can be seen that the value of Yp (flash length at the air groove) is minimum when a (air bag pressure) is 3bar, B (lower die parting surface air groove depth) is 0.5mm, and c (upper die parting surface U-shaped groove depth) is 8.5mm.
Through the optimization, the air bag pressure is selected: the pressure of the air bag is preferably controlled to 2.5-3 bar. However, since the performance of different molds and foaming materials is different, the selection of the air bag pressure will be different, and the data according to the present invention shows that the air bag pressure has the least influence on Yp (flash length at air groove), so the present invention is not limited to the air bag pressure. Selecting the depth of the parting surface air groove: the air groove depth of the parting surface of the lower die is controlled to be about 0.5mm. Selection of the depth of the U-shaped groove: and (3) forming a U-shaped groove on the parting surface of the upper die of the die, embedding a sealing ring for soft sealing, and controlling the depth of the U-shaped groove to be 8.5mm. The soft sealing mode of the invention is adopted to transversely expand the soft sealing improvement scheme of the die of the K215 front rest to the current upper parts of K216, K218, K256, JCSB and D2UC, and the flash qualification rate is increased from 0% to 99%.
Application example
The common electric spark parting surface sealing mode and the soft sealing mode of the invention are adopted, the mould is subjected to foaming molding under the same technological condition, the maintenance frequency of the parting surfaces is compared, the influence of different parting surface sealing modes on the mould and the product is evaluated, and the specific results are shown in fig. 10 and table 5.
Table 5 die maintenance costs for different sealing modes
As can be seen from fig. 10, the spark sealing method produces a product with obvious flash; and it can be seen by counting the maintenance conditions (table 5) of 400 moulds, the soft sealing mode of the invention is compared with the electric spark sealing mode, can obviously reduce the maintenance times of the foaming forming mould, prolong the service life, and can reduce the manual maintenance time, further count the statistics data of material cost, labor cost, maintenance time and the like of the different sealing modes, and each mould adopts soft sealing to maintain the cost lower than the electric spark by 628.8 yuan each year, thereby greatly reducing the production cost and having higher economic benefit.
Claims (5)
1. The foaming forming die is characterized by comprising a die formed by folding an upper die (1) and a lower die (2), wherein a cavity (3) and a parting surface (4) to be processed are arranged in the die, the parting surface (4) comprises the parting surface (4) of the upper die (1) and the parting surface (4) of the lower die (2), one parting surface (4) is provided with a U-shaped groove (5), the other parting surface (4) is provided with an air groove (6), a hollow sealing ring (7) is embedded in a containing space formed by the air groove (6) and the U-shaped groove (5), and the volume of the sealing ring (7) is larger than that of the containing space;
the groove width of the air groove (6) is 9-11 mm and the groove depth is 0.3-0.7 mm; the sealing ring (7) comprises a trapezoid section (71) and an arc section (72) which are in smooth transition, wherein the small-diameter end of the trapezoid section (71) is connected with the arc section (72) and the length of the small-diameter end is the same as the diameter of the arc; the length of the small diameter end of the trapezoid section (71) is 8-10 mm, the length of the large diameter end of the trapezoid section (71) is 9-11 mm, the height of the trapezoid section (71) is 4-6 mm, and the circular arc diameter of the circular arc section (72) is 8-10 mm;
the U-shaped groove (5) comprises a conical section (51) and an arc-shaped section (52) which are in smooth transition, wherein the large-diameter end of the conical section (51) is connected with the arc-shaped section (52) and the length of the large-diameter end is the same as the diameter of the arc;
the length of the small diameter end of the conical section (51) is 8-9 mm, the length of the large diameter end of the conical section (51) is 8-10 mm, the height of the conical section (51) is 3-5 mm, and the circular arc diameter of the arc section (52) is 8-10 mm; the sealing ring (7) is 0.3-1.5 mm higher than the U-shaped groove (5).
2. The soft sealed foaming molding die of the parting surface according to claim 1, wherein the preset distance between the U-shaped groove (5) and the boundary line between the parting surface (4) and the cavity (3) is 3-5 mm.
3. A soft-sealed foaming mold for parting surfaces according to claim 1 or 2, characterized in that a chamfer (8) is provided on the sealing ring (7) on the side facing the air groove (6).
4. A soft-sealed foaming molding die for parting surfaces according to claim 1, characterized in that the air groove (6) has a groove width of 10mm and a groove depth of 0.5mm.
5. The foaming molding die for soft sealing of parting surfaces according to claim 1, wherein the length of the small diameter end and the length of the large diameter end of the trapezoid section (71) are 9mm and 10mm, the height of the trapezoid section (71) is 5mm, the circular arc diameter of the circular arc section (72) is 9mm, and the height of the sealing ring (7) is 9.5mm.
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