CN113844012B - Vacuum plastic suction forming die and plastic suction process - Google Patents
Vacuum plastic suction forming die and plastic suction process Download PDFInfo
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- CN113844012B CN113844012B CN202111120873.2A CN202111120873A CN113844012B CN 113844012 B CN113844012 B CN 113844012B CN 202111120873 A CN202111120873 A CN 202111120873A CN 113844012 B CN113844012 B CN 113844012B
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- 239000004033 plastic Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008569 process Effects 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 95
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims description 29
- 238000000605 extraction Methods 0.000 claims description 21
- 238000009423 ventilation Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000007666 vacuum forming Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims 2
- 238000005086 pumping Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010137 moulding (plastic) Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
- B29C51/36—Moulds specially adapted for vacuum forming, Manufacture thereof
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
- B29C51/40—Venting means
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/44—Removing or ejecting moulded articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention provides a vacuum plastic-sucking forming die, which comprises: a mounting plate; the sealing cylinder is arranged at the top of the mounting plate, the top end of the sealing cylinder is of a cavity structure, a first telescopic cylinder is fixedly arranged at the bottom of the sealing cylinder, and a lower die is fixedly arranged at one end of an output shaft of the first telescopic cylinder and positioned in the sealing cylinder; the upper top plate is fixedly arranged at the top of the mounting plate through a supporting arm, and a second telescopic cylinder is fixedly arranged at the top of the upper top plate. According to the vacuum plastic sucking forming die and the vacuum plastic sucking process, the heated and softened plastic plate is pressurized and swelled, the lower die is lifted firstly, the plastic plate is gradually attached to the surface of the lower die, the vacuum pumping treatment is carried out through the air pumping mechanism, then the upper die is attached to the outer side of a workpiece, and the vacuum pumping treatment is carried out through the air pumping mechanism, so that the attaching degree between the plastic plate and the upper die and the lower die can be improved, and the thickness of the workpiece is more uniform.
Description
Technical Field
The invention relates to the field of vacuum plastic suction, in particular to a vacuum plastic suction forming die and a plastic suction process.
Background
The mold refers to various molds and tools used for injection molding, blow molding, extrusion, die casting or forging, smelting, stamping and other methods in industrial production to obtain the required products.
The vacuum forming is to fix thermoplastic plastic plate and sheet onto the mold, heat the mold to softening temperature with radiation heater, pump off the air between the plate and the mold with vacuum pump to form the parison in the contour of the mold, cool air and release the plastic part from the mold with compressed air.
At present, when the vacuum forming equipment is vacuumized, an vacuumized gas transmission channel is arranged on an upper die and a lower die or one of the upper die and the lower die, when the vacuum forming equipment is vacuumized, the gas pressure at the position of the gas transmission channel is large, softened plastic plate pieces are easily adsorbed into holes, and meanwhile, the vacuumized negative pressure applied to the workpiece is uneven, so that the thickness of the plastic workpiece is uneven.
Therefore, it is necessary to provide a vacuum forming mold and a vacuum forming process to solve the above technical problems.
Disclosure of Invention
The invention provides a vacuum plastic sucking forming die and a vacuum plastic sucking process, which solve the problems that when the vacuum is pumped, the air pressure at the position of the air conveying channel is large, so that the vacuum negative pressure of a workpiece is uneven, and the adhesion of a plastic plate to the die is uneven.
In order to solve the technical problems, the vacuum plastic-sucking forming die provided by the invention comprises:
a mounting plate;
the sealing cylinder is arranged at the top of the mounting plate, the top end of the sealing cylinder is of a cavity structure, a first telescopic cylinder is fixedly arranged at the bottom of the sealing cylinder, and a lower die is fixedly arranged at one end of an output shaft of the first telescopic cylinder and positioned in the sealing cylinder;
the upper top plate is fixedly arranged at the top of the mounting plate through a supporting arm, a second telescopic cylinder is fixedly arranged at the top of the upper top plate, and an upper die is fixedly arranged at one end of an output shaft of the second telescopic cylinder;
the lower die and the upper die comprise an outer shell and an inner ring layer, a ventilation cavity is formed between the outer shell and the inner ring layer, arc-shaped gas transmission holes are formed in the tops of the lower die and the upper die in an annular mode, the arc-shaped gas transmission holes are communicated with the inside of the ventilation cavity, and the top of the inner wall of the lower die is located in the ventilation cavity and the top of the upper die is provided with a gas extraction mechanism.
Preferably, the air extraction mechanism comprises an annular pipe, an air conveying protrusion is arranged on the upper side of the annular pipe, the air conveying protrusion is located in an arc-shaped air conveying hole, a sealing baffle is mounted in the annular pipe, and an air extraction pipe is connected to one side of the annular pipe, located on the sealing baffle.
Preferably, one end of the exhaust pipe penetrates through the lower die and extends to the outside of the lower die, a branch pipe is connected to one side of the exhaust pipe and located in the ventilation cavity of the lower die, and second valves are arranged on the branch pipe and the exhaust pipe.
Preferably, one end of the exhaust pipe in the lower die is connected with a gas pipe fitting, the gas pipe fitting comprises a first connecting pipe and a second connecting pipe, the first connecting pipe is connected with the exhaust pipe, the second connecting pipe is arranged on one side of the sealing cylinder, and the first connecting pipe and the second connecting pipe are communicated through a three-way pipe.
Preferably, the first connecting pipe and the second connecting pipe are respectively provided with a first valve, and the air exhaust mechanism on the upper die is connected with an air pipe.
Preferably, the internally mounted of ring pipe has even adjustment mechanism, even adjustment mechanism includes sealing block and arc sealing strip, one side of sealing block is connected with sealing baffle through the elastic component, the opposite side fixedly connected with linking arm of sealing block, the one end fixed connection driving rope of linking arm.
Preferably, the bottom of arc sealing strip pass through the setting element connect in the inside of annular pipe, the upside of arc sealing strip is provided with sealed arch, sealed arch is located the bellied inside of gas-supply, the inside of annular pipe just is located two guide bars of upside fixedly connected with linking arm, two guide bars with the bottom fixed connection of arc sealing strip are walked around to the one end of driving rope.
Preferably, the locating piece comprises a sliding sleeve and a sliding rod, the sliding rod is slidably connected to the sliding sleeve, the upper end of the sliding rod is fixedly connected with the arc-shaped sealing strip, the sliding sleeve is fixed to the bottom of the inner wall of the annular tube, and a spring is installed in the sliding sleeve and located on the lower side of the sliding rod.
Preferably, a fixing piece is arranged at the top of the mounting plate, and a heating piece is arranged on the inner ring layer.
The invention also provides a vacuum plastic sucking process, which comprises the following steps:
s1: placing a plastic plate to be processed on the mounting plate, and fixing the side of the plastic plate by a fixing piece;
s2: heating the plastic plate by heating equipment to soften the plastic plate;
s3: opening a first valve positioned on the second connecting pipe, inputting gas into the sealing cylinder, pressurizing the interior of the sealing cylinder, and making the plastic plate bulge upwards;
s4: starting a first telescopic cylinder, pushing up a lower die by the first telescopic cylinder, enabling the lower die to be in contact with the bulged plastic plate, and pushing up the plastic plate to enable the plastic plate to be gradually attached to the surface of the lower die;
s5: opening a first valve on the second connecting pipe after bonding, vacuumizing, and enabling air flow to draw out air flow in the annular pipe to form vacuum, pushing the sealing block under the action of air pressure at the moment, enabling the sealing block to drive the arc-shaped sealing strip to move downwards through the driving rope, enabling the air transmission bulge on the upper side of the annular pipe to be communicated with the arc-shaped air transmission hole, and enabling the air flow in a gap between the plastic plate and the lower die to be drawn out, so that bonding degree between the plastic plate and the lower die is improved;
s6: then, the second telescopic cylinder is started to push the upper die to move downwards so as to be sleeved outside the plastic plate, the upper die is vacuumized through the air suction mechanism, and the bonding degree between the outer side of the plastic plate and the inner side of the upper die is improved, wherein after the vacuumizing of the upper die and the lower die is completed, the arc-shaped sealing strip is pushed upwards through the functions of the elastic piece and the spring so that the sealing bulge is positioned inside the gas transmission bulge, and plastic adsorbed inside the gas transmission bulge can be ejected out, so that the surface of a workpiece is smoother;
s7: then the second valve on the exhaust pipe can be closed, the second valve on the branch pipe is opened, and cold air is introduced into the ventilation cavity, so that the forming speed of the workpiece is increased, and the workpiece is taken out after the forming is finished.
Compared with the related art, the vacuum plastic-sucking forming die and the plastic-sucking process provided by the invention have the following beneficial effects:
the invention provides a vacuum plastic sucking forming die and a vacuum plastic sucking process, wherein a heated and softened plastic plate is pressurized and swelled, the plastic plate is gradually attached to the surface of a lower die by lifting the lower die, and is vacuumized by an air extraction mechanism, then an upper die is attached to the outer side of a workpiece and is vacuumized by the air extraction mechanism, so that the attaching degree between the plastic plate and the upper die and the lower die can be improved, and the thickness of the workpiece is more uniform;
the air suction mechanism is internally provided with a uniform regulating mechanism, so that the air pressure for vacuumizing can uniformly act between the workpiece and the lower die and between the workpiece and the upper die through the arc-shaped air transmission holes, and the vacuumizing effect is improved;
after vacuumizing is finished, the arc-shaped sealing strip is pushed upwards through the action of the elastic piece and the spring, so that the sealing bulge is positioned in the gas transmission bulge, and plastic adsorbed in the gas transmission bulge can be ejected out, the surface of a workpiece is smoother, and the overall quality of the moving piece is improved;
meanwhile, cold air can be introduced into the ventilation cavity through the air delivery pipe fitting and the air extraction mechanism, so that the forming speed of a workpiece is increased.
Drawings
FIG. 1 is a schematic view of a first embodiment of a vacuum forming mold according to the present invention;
FIG. 2 is a bottom view of the monolith shown in FIG. 1;
FIG. 3 is a schematic view of the lower mold shown in FIG. 1;
FIG. 4 is a top view of the lower mold shown in FIG. 1;
FIG. 5 is a schematic view of a partial structure of the lower mold shown in FIG. 1;
FIG. 6 is a schematic view of the pumping mechanism shown in FIG. 5;
FIG. 7 is a schematic structural view of a uniformity adjustment mechanism;
fig. 8 is a schematic structural diagram of a second embodiment of a vacuum forming mold provided by the invention.
Reference numerals in the drawings:
1. a mounting plate, 2, a sealing cylinder, 3 and a first telescopic cylinder,
4. a lower die 41, an outer shell 42, an inner ring layer 43, a connecting block 44, an arc-shaped gas transmission hole 45 and a ventilation cavity,
5. the supporting arm is provided with a plurality of supporting arms,
6. a gas pipe fitting 61, a first connecting pipe 62, a second connecting pipe 63, a three-way pipe 64 and a first valve,
7. the upper die is arranged on the upper die,
8. the air extracting mechanism, 81, the annular pipe, 82, the air conveying protrusion, 83, the air extracting pipe, 84, the branch pipe, 85, the second valve, 91, the sealing block, 92, the elastic piece, 93, the arc sealing strip, 94, the sealing protrusion, 95, the driving rope, 96 and the guide rod,
10. the second telescopic cylinder, 11, the fixing piece, 12, the upper top plate, 13, the gas pipe, 14, the heating piece, 15, the sealing baffle plate, 161, the sliding sleeve, 162 and the sliding rod,
17. the device comprises a mounting frame 181, a mounting block 182, an internally threaded tube 183, a driving shaft 184, a driven gear 185, a positioning arm 186, a motor 187, a rotating shaft 188 and a driving gear.
Description of the embodiments
The invention will be further described with reference to the drawings and embodiments.
Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, and fig. 7 in combination, fig. 1 is a schematic structural diagram of a first embodiment of a vacuum forming mold according to the present invention; FIG. 2 is a bottom view of the monolith shown in FIG. 1; FIG. 3 is a schematic view of the lower mold shown in FIG. 1; FIG. 4 is a top view of the lower mold shown in FIG. 1; FIG. 5 is a schematic view of a partial structure of the lower mold shown in FIG. 1; FIG. 6 is a schematic view of the pumping mechanism shown in FIG. 5; fig. 7 is a schematic structural view of the uniform adjustment mechanism. Vacuum plastic uptake forming die includes:
a mounting plate 1;
the sealing cylinder 2 is arranged at the top of the mounting plate 1, the top end of the sealing cylinder 2 is of a cavity structure, a first telescopic cylinder 3 is fixedly arranged at the bottom of the sealing cylinder 2, and a lower die 4 is fixedly arranged at one end of an output shaft of the first telescopic cylinder 2 and positioned in the sealing cylinder 2;
the upper top plate 12 is fixedly arranged at the top of the mounting plate 1 through a supporting arm 5, a second telescopic cylinder 10 is fixedly arranged at the top of the upper top plate 12, and an upper die 7 is fixedly arranged at one end of an output shaft of the second telescopic cylinder 10;
the part of the mounting plate 1 corresponding to the top cavity of the sealing cylinder 2 is correspondingly provided with a circular hole, the output shaft of the first telescopic cylinder 3 penetrates through the sealing cylinder 2 to be fixed with the lower die 4, and the penetrating part is sealed mechanically.
The shape of the inner cavity of the upper die 7 is the same as that of the lower die 4, and the formed gap is the thickness of the formed workpiece.
The lower die 4 and the upper die 7 comprise an outer shell 41 and an inner ring layer 42, an air ventilation cavity 43 is formed between the outer shell 41 and the inner ring layer 42, arc air transmission holes 44 are formed in the tops of the lower die 4 and the upper die 7 in an annular mode, the arc air transmission holes 44 are communicated with the inside of the air ventilation cavity 43, and the top of the inner wall of the lower die 4 is located in the inside of the air ventilation cavity 43 and the top of the upper die 7 are provided with an air extraction mechanism 8.
The number of the arc-shaped air delivery holes 44 is preferably four, so that an annular output hole is formed at the top of the upper die 7 and the lower die 4, vacuum can be more uniformly pumped from the whole surface between the die and the workpiece through annular opening, and if the die is a cube, the annular shapes are rectangular surfaces,
the air extraction mechanism 8 comprises an annular pipe 81, an air delivery protrusion 82 is arranged on the upper side of the annular pipe 81, the air delivery protrusion 82 is located inside the arc-shaped air delivery hole 44, a sealing baffle 15 is installed inside the annular pipe 81, and an air extraction pipe 83 is connected to one side of the annular pipe 81, located on the sealing baffle 15.
The positions and the number of the air delivery protrusions 82 correspond to those of the arc-shaped air delivery holes, and the exhaust pipe 83 is connected to one side of the sealing baffle 15, so that when the air is pumped out, the negative pressure acts on the uniform regulating mechanism after the air flow of the whole pipeline is pumped out.
One end of the air extraction pipe 83 penetrates through the lower die 4 and extends to the outside of the lower die 4, a branch pipe 84 is connected to one side of the air extraction pipe 83 and located in the ventilation cavity 45 of the lower die 4, and a second valve 85 is arranged on each of the branch pipe 84 and the air extraction pipe 83.
Wherein the air delivery protrusion 82 at the bottom side of the annular pipe 81 in the air extraction mechanism 8 on the upper mold 7 is communicated with the inside of the upper mold 7, and the branch pipe 84 connected with the air extraction pipe 83 is communicated with the ventilation cavity 45.
One end of the exhaust pipe 83 in the lower die 4 is connected with an air delivery pipe fitting 6, the air delivery pipe fitting 6 comprises a first connecting pipe 61 and a second connecting pipe 62, the first connecting pipe 61 is connected with the exhaust pipe 83, the second connecting pipe 62 is installed on one side of the sealing cylinder 2, and the first connecting pipe 61 and the second connecting pipe 62 are communicated through a three-way pipe 63.
The first connecting pipe 61 and the second connecting pipe 62 are respectively provided with a first valve 64, and the air suction mechanism 8 on the upper die 7 is connected with an air pipe 13.
One end of the three-way pipe 63 and one end of the air conveying pipe 13 are connected with the air conveying mechanism, the air conveying mechanism comprises a vacuum pump and an air blower, one end of the three-way pipe is connected with the three-way pipe through an air conveying pipeline, one end of the three-way pipe is connected with the vacuum pump, the other end of the three-way pipe is connected with the air blower, one end of the air conveying pipe 13 is connected with the input end of the vacuum pump, the air conveying mechanism further comprises refrigerating equipment which can be an air conditioner or other equipment, the temperature of the fed air flow can be reduced, and the air conditioner is regulated and controlled according to the step requirement of use.
The internally mounted of ring pipe 81 has even adjustment mechanism, even adjustment mechanism includes sealing block 91 and arc sealing strip 93, one side of sealing block 91 is connected with sealing baffle 15 through elastic component 92, the opposite side fixedly connected with linking arm of sealing block 91, the one end fixed connection driving rope 95 of linking arm.
Wherein the gas transmission protrusion 82 corresponds to the sealing baffle 15 and one side of the sealing block 91 is provided with a seal, and the length of the seal is located at the end of the connecting arm.
The bottom of arc sealing strip 93 pass through the setting element connect in the inside of ring pipe 81, the upside of arc sealing strip 93 is provided with sealed protruding 94, sealed protruding 94 is located the inside of gas transmission arch 82, the inside of ring pipe 81 just is located the upside fixedly connected with guide bar 96 of fixedly connected with linking arm, two guide bars with the bottom fixed connection of arc sealing strip 93 are walked around to the one end of driving rope 95.
The upper side of the arc-shaped sealing strip 93 is adhered with adhesive tapes, so that the tightness is ensured, and the arc-shaped sealing strip 93 corresponds to the number of the positions of the gas transmission protrusions.
The locating piece includes sliding sleeve 161 and slide bar 162, slide bar 162 sliding connection in the inside of sliding sleeve 161, the upper end of slide bar 162 with arc sealing strip 93 fixed connection, sliding sleeve 161 is fixed in the bottom of ring pipe 81 inner wall, the spring is installed to the inside of sliding sleeve 161 and the downside that is located slide bar 162.
At least one positioning piece corresponds to each arc-shaped sealing strip 93; wherein the pulling of the vacuum creates a negative pressure that is greater than the spring force of the spring and spring member 92.
The top of mounting panel 1 is provided with mounting 11, install heating element 14 on the inner race layer 42.
The heating element is preferably a PTC heating element, so that the upper die 7 and the lower die 4 can be heated in the process of forming the softened plastic plate by the upper die 7 and the lower die 4, the situation that the softened plastic plate is incompletely attached to the upper die 7 and the lower die 4 due to cooling after leaving the heating equipment is avoided, the plastic plate can be ensured to be always softened, and after the plastic plate is completely formed, the heating element is closed for cooling, so that the forming quality of a workpiece is improved;
the fixing piece 11 is an annular fixing piece, the annular fixing piece is specifically arranged according to the shape of the die, the mounting plate 1 is correspondingly provided with a fixed threaded shaft, an annular fixing ring is sleeved on the threaded shaft and is matched with a star nut to fix and limit, and other fixing equipment can be used.
A vacuum plastic sucking process, comprising the steps of:
s1: placing a plastic plate to be processed on the mounting plate 1 and fixing the side of the plastic plate by the fixing piece 11;
s2: heating the plastic plate by heating equipment to soften the plastic plate;
s3: opening a first valve 64 positioned on the second connecting pipe 62, inputting gas into the sealing cylinder 2, pressurizing the interior of the sealing cylinder 2, and making the plastic plate bulge upwards;
s4: starting a first telescopic cylinder 3, wherein the first telescopic cylinder 3 pushes up a lower die 4, the lower die 4 is in contact with the bulged plastic plate, and the plastic plate is pushed up, so that the plastic plate is gradually attached to the surface of the lower die 4;
s5: after the plastic plate is attached, the first valve 64 on the second connecting pipe 62 is opened, vacuumizing treatment is carried out, air flow in the annular pipe is pumped out to form vacuum, at the moment, the sealing block 91 is pushed by the action of air pressure, the sealing block 91 drives the arc-shaped sealing strip 93 to move downwards through the driving rope 95, the connecting arm pushes the driving rope 95 to move along the upper side of the guide rod, the arc-shaped sealing strip 93 is pulled downwards, the sliding rod 162 is driven to compress a spring positioned in the sliding sleeve 161 in the downward moving process of the arc-shaped sealing strip 93, the elastic piece 92 is pulled by the sealing baffle 15, the air conveying protrusions 82 on the upper side of the annular pipe 81 are communicated with the arc-shaped air conveying holes 44, and the air flow in a gap between the plastic plate and the lower die is pumped out, so that the attaching degree of the plastic plate and the lower die is improved;
s6: then, the second telescopic cylinder is started to push the upper die 7 to move downwards so as to be sleeved outside the plastic plate, the upper die 7 is vacuumized through the air suction mechanism 8 in the same way, and the bonding degree between the outer side of the plastic plate and the inner side of the upper die is improved in the same way, wherein after the upper die and the lower die are vacuumized, the arc-shaped sealing strips 93 are pushed upwards under the action of the elastic pieces 92 and the springs so that the sealing bulges 94 are positioned inside the air conveying bulges 82, and plastic adsorbed to the inside of the air conveying bulges 82 can be ejected out, so that the surface of a workpiece is smoother;
s7: then the second valve 85 on the exhaust pipe 83 can be closed, the second valve 85 on the branch pipe 84 is opened, and cold air is introduced into the ventilation cavity, so that the forming speed of the workpiece is increased, and the workpiece is taken out after the forming is finished.
Compared with the related art, the vacuum plastic-sucking forming die and the plastic-sucking process provided by the invention have the following beneficial effects:
the plastic plate which is softened by heating is pressurized and swelled, firstly, the lower die is lifted, the plastic plate is gradually attached to the surface of the lower die, and vacuumized through the air extraction mechanism 8, then the upper die is attached to the outer side of a workpiece, and vacuumized through the air extraction mechanism 8, so that the attaching degree between the plastic plate and the upper die and the lower die can be improved, and the thickness of the workpiece is more uniform;
the air suction mechanism 8 is internally provided with a uniform regulating mechanism, so that the air pressure for vacuumizing can uniformly act between the workpiece and the lower die 4 and between the workpiece and the upper die 7 through the arc-shaped air transmission holes 44, and the vacuumizing effect is improved;
after the vacuumizing is finished, the arc-shaped sealing strip 93 is pushed upwards under the action of the elastic piece 92 and the spring, so that the sealing protrusion 94 is positioned inside the air conveying protrusion 82, and plastic adsorbed inside the air conveying protrusion 82 can be ejected out, the surface of a workpiece is smoother, and the overall quality of the moving piece is improved;
meanwhile, cold air can be introduced into the ventilation cavity through the gas transmission pipe fitting matched with the air extraction mechanism 8, so that the forming speed of a workpiece is increased.
Examples
Referring to fig. 8 in combination, another vacuum forming mold is proposed according to a second embodiment of the present application based on the vacuum forming mold provided in the first embodiment of the present application. The second embodiment is merely a preferred manner of the first embodiment, and implementation of the second embodiment does not affect the implementation of the first embodiment alone.
Specifically, the vacuum plastic molding mold provided in the second embodiment of the present application is different in that the vacuum plastic molding mold further includes two mounting frames 17, the two mounting frames 17 are respectively and fixedly mounted at the bottom of the sealing cylinder 2 and the top of the upper top plate 12, the first telescopic cylinder 3 and the second telescopic cylinder 10 are respectively and fixedly mounted on the mounting frame 17 located at the bottom of the sealing cylinder 2 and the mounting frame 17 located at the top of the upper top plate 12, and the first telescopic cylinder 3 and the second telescopic cylinder 10 are both connected with the lower mold 4 and the upper mold 7 through a demolding driving mechanism;
the demolding driving mechanism comprises a mounting block 181, the mounting block 181 is fixedly mounted at the end parts of output shafts of the first telescopic cylinder 3 and the second telescopic cylinder 10, the top of the mounting block 181 is rotationally connected with an internal thread pipe 182, the internal thread of the internal thread pipe 182 is connected with a driving shaft 183, the lower side of the surface of the driving shaft 183 is provided with external threads matched with the internal thread pipe 182, the surface of the internal thread pipe 182 is fixedly connected with a driven gear 184, the upper side of the surface of the driving shaft 183 is symmetrically and fixedly connected with positioning arms 185, the two positioning arms 185 are in sliding connection with two sides of the inner wall of the mounting frame 17, and the end parts of the two driving shafts 183 are fixedly connected with the top of the upper mold 7 and the bottom of the lower mold 4;
one side of installation piece 181 bottom fixed mounting has motor 186, the one end of motor 186 output shaft passes through shaft coupling fixedly connected with axis of rotation 187, fixedly connected with driving gear 188 on the axis of rotation 87, box in driving gear 188 and the driven gear 184, the mounting bracket 17 is last to have seted up the pilot hole in the position of corresponding motor 186.
After the mold is cooled and formed, the motors 186 in the two mold stripping driving mechanisms can be controlled to rotate, and the output shafts of the two motors 186 rotate reversely, the rotation shaft 187 drives the driven gear 184 to rotate through the driving gear 188, so that the two internal threaded pipes 182 are driven to reversely rotate, and the driving shafts 183 are in sliding connection with the mounting frame 17 through the positioning arms 185, so that the two internal threaded pipes 182 drive the two driving shafts 183 to move only in the vertical direction and move in opposite directions, namely, the two driving shafts 183 move towards the inner part of the internal threaded pipes 182, so that the upper mold 7 and the lower mold 4 are driven to simultaneously move to the opposite sides and are separated from the formed workpiece, and the subsequent mold stripping is facilitated.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. A vacuum forming die, comprising:
a mounting plate;
the sealing cylinder is arranged at the top of the mounting plate, the top end of the sealing cylinder is of a cavity structure, a first telescopic cylinder is fixedly arranged at the bottom of the sealing cylinder, and a lower die is fixedly arranged at one end of an output shaft of the first telescopic cylinder and positioned in the sealing cylinder;
the upper top plate is fixedly arranged at the top of the mounting plate through a supporting arm, a second telescopic cylinder is fixedly arranged at the top of the upper top plate, and an upper die is fixedly arranged at one end of an output shaft of the second telescopic cylinder;
the lower die and the upper die comprise an outer shell and an inner ring layer, a ventilation cavity is formed between the outer shell and the inner ring layer, arc-shaped gas transmission holes are formed in the tops of the lower die and the upper die in an annular mode, the arc-shaped gas transmission holes are communicated with the inside of the ventilation cavity, and air extraction mechanisms are arranged at the top of the inner wall of the lower die and positioned in the ventilation cavity and at the top of the upper die;
the air exhaust mechanism comprises an annular pipe, an air transmission bulge is arranged on the upper side of the annular pipe, the air transmission bulge is positioned in an arc air transmission hole, a sealing baffle is arranged in the annular pipe, and an air exhaust pipe is connected to one side of the annular pipe, which is positioned on the sealing baffle;
the annular pipe is internally provided with a uniform regulating mechanism, the uniform regulating mechanism comprises a sealing block and an arc sealing strip, one side of the sealing block is connected with a sealing baffle through an elastic piece, the other side of the sealing block is fixedly connected with a connecting arm, and one end of the connecting arm is fixedly connected with a transmission rope;
the bottom of arc sealing strip pass through the setting element connect in the inside of ring pipe, the upside of arc sealing strip is provided with sealed arch, sealed arch is located the bellied inside of gas-supply, the inside of ring pipe just is located two guide bars of upside fixedly connected with linking arm, two guide bars with the bottom fixed connection of arc sealing strip are walked around to the one end of driving rope.
2. The vacuum plastic suction forming mold according to claim 1, wherein one end of the air extraction pipe penetrates through the lower mold and extends to the outside of the lower mold, a branch pipe is connected to one side of the air extraction pipe and is positioned in the ventilation cavity of the lower mold, and a second valve is arranged on each of the branch pipe and the air extraction pipe.
3. The vacuum plastic suction forming mold according to claim 1, wherein one end of the air suction pipe in the lower mold is connected with an air delivery pipe, the air delivery pipe comprises a first connecting pipe and a second connecting pipe, the first connecting pipe is connected with the air suction pipe, the second connecting pipe is installed on one side of the sealing cylinder, and the first connecting pipe and the second connecting pipe are communicated through a three-way pipe.
4. A vacuum forming die as claimed in claim 3, wherein the first connecting pipe and the second connecting pipe are respectively provided with a first valve, and the air suction mechanism on the upper die is connected with an air pipe.
5. The vacuum forming mold according to claim 4, wherein the positioning member comprises a sliding sleeve and a sliding rod, the sliding rod is slidably connected to the inside of the sliding sleeve, the upper end of the sliding rod is fixedly connected with the arc-shaped sealing strip, the sliding sleeve is fixed to the bottom of the inner wall of the annular tube, and a spring is installed in the inside of the sliding sleeve and located at the lower side of the sliding rod.
6. The vacuum plastic suction forming mold according to claim 1, wherein a fixing member is arranged at the top of the mounting plate, and a heating member is arranged on the inner ring layer.
7. A vacuum molding process using the vacuum molding die according to any one of claims 1 to 6, comprising the steps of:
s1: placing a plastic plate to be processed on the mounting plate, and fixing the side of the plastic plate by a fixing piece;
s2: heating the plastic plate by heating equipment to soften the plastic plate;
s3: opening a first valve positioned on the second connecting pipe, inputting gas into the sealing cylinder, pressurizing the interior of the sealing cylinder, and making the plastic plate bulge upwards;
s4: starting a first telescopic cylinder, pushing up a lower die by the first telescopic cylinder, enabling the lower die to be in contact with the bulged plastic plate, and pushing up the plastic plate to enable the plastic plate to be gradually attached to the surface of the lower die;
s5: opening a first valve on the second connecting pipe after bonding, vacuumizing, and enabling air flow to draw out air flow in the annular pipe to form vacuum, pushing the sealing block under the action of air pressure at the moment, enabling the sealing block to drive the arc-shaped sealing strip to move downwards through the driving rope, enabling the air transmission bulge on the upper side of the annular pipe to be communicated with the arc-shaped air transmission hole, and enabling the air flow in a gap between the plastic plate and the lower die to be drawn out, so that bonding degree between the plastic plate and the lower die is improved;
s6: then, the second telescopic cylinder is started to push the upper die to move downwards so as to be sleeved outside the plastic plate, the upper die is vacuumized through the air suction mechanism, and the bonding degree between the outer side of the plastic plate and the inner side of the upper die is improved, wherein after the vacuumizing of the upper die and the lower die is completed, the arc-shaped sealing strip is pushed upwards through the functions of the elastic piece and the spring so that the sealing bulge is positioned inside the gas transmission bulge, and plastic adsorbed inside the gas transmission bulge can be ejected out, so that the surface of a workpiece is smoother;
s7: then the second valve on the exhaust pipe can be closed, the second valve on the branch pipe is opened, and cold air is introduced into the ventilation cavity, so that the forming speed of the workpiece is increased, and the workpiece is taken out after the forming is finished.
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| CN202111120873.2A CN113844012B (en) | 2021-09-24 | 2021-09-24 | Vacuum plastic suction forming die and plastic suction process |
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| CN202111120873.2A CN113844012B (en) | 2021-09-24 | 2021-09-24 | Vacuum plastic suction forming die and plastic suction process |
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| CN113844012B true CN113844012B (en) | 2024-02-02 |
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| US20090289397A1 (en) * | 2008-05-21 | 2009-11-26 | Pia-K Enterprises, Llc | Forming Station of Apparatus for Making Packaging |
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| CN113844012A (en) | 2021-12-28 |
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Effective date of registration: 20240902 Address after: Building 1, No. 21 Qilidian Road, Honglan Street, Lishui District, Nanjing City, Jiangsu Province 210000 Patentee after: Nanjing Rongze Plastic Co.,Ltd. Country or region after: China Address before: 215011 No. 121, Huafeng Road, Fengqiao Industrial Park, high tech Zone, Suzhou, Jiangsu Patentee before: SUZHOU RONGZE ELECTRONIC TECHNOLOGY Co.,Ltd. Country or region before: China |
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