CN111605140A - Secondary injection molding mould and injection molding - Google Patents
Secondary injection molding mould and injection molding Download PDFInfo
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- CN111605140A CN111605140A CN202010271758.4A CN202010271758A CN111605140A CN 111605140 A CN111605140 A CN 111605140A CN 202010271758 A CN202010271758 A CN 202010271758A CN 111605140 A CN111605140 A CN 111605140A
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- mold
- core
- movable
- mould
- die
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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
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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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1615—The materials being injected at different moulding stations
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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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of injection molding, and discloses a secondary injection molding mold and an injection molding piece, wherein the mold comprises a movable mold and a fixed mold, the fixed mold comprises a fixed mold core, a primary molding fixed mold cavity and a secondary molding fixed mold cavity are arranged on the fixed mold core, the movable mold comprises a large mold core and a small mold core, the large mold core and the small mold core are slidably arranged on the movable mold, the small mold core is fixedly arranged on the movable mold, the large mold core and the small mold core are combined to form a primary molding movable mold cavity and a secondary molding movable mold cavity, the large mold core and the small mold core are attached and can slide with each other, the large mold core is connected with a rotary telescopic mechanism, after the mold is opened, the rotary telescopic mechanism works, the large mold core drives a primary molding product to be separated from the movable mold and rotate 180 degrees, and. The invention optimizes the requirements of the secondary forming die on the size of the power source, saves the cost of the power source, and is adaptive to the power sources with different sizes to work so as to achieve better secondary forming effect.
Description
Technical Field
The invention relates to the technical field of injection molding, in particular to a secondary injection molding mold and an injection molding piece.
Background
The secondary injection molding is a special plastic molding process, in which a certain plastic raw material is molded in a primary plastic mold, the molded part is taken out, and the molded part is placed in a secondary molding mold to be injected with the same or another plastic material again.
In the prior art, in a chinese patent document with an authority publication number of CN209191164U, a two-color secondary forming mold is described, the mold comprises a rotary platform and a rotary motor, a gear ring is arranged outside the rotary platform, a supporting beam is arranged on a working end of the rotary motor, movable molds are arranged at two ends of the supporting beam respectively, the mold further comprises a primary forming fixed mold and a secondary forming fixed mold, the two movable molds are matched with the primary forming fixed mold and the secondary forming fixed mold, the primary forming fixed mold comprises a fixed mold bottom plate, a runner plate and a primary forming a plate which are connected in sequence, a fixed mold insert is arranged in the primary forming a plate, the fixed mold insert can form a cavity with the movable molds when the molds are closed, a pressure bar cushion block corresponding to the position of the guide groove is further arranged on a bottom end face of the primary forming a plate, and the secondary forming fixed mold press bar comprises a fixed mold bottom plate, a runner, the die comprises an A plate, a movable die insert and a cover half insert, wherein the A plate is formed by an A plate and a B plate, the A plate is formed by a movable die insert and a cover half insert, the cover half insert and the movable die insert can form a cavity when the die is closed, and a reset rod cushion block corresponding to the position of a reset rod guide groove is further arranged on the bottom end surface of the A plate.
The working process is as follows: firstly, enabling a lifting cylinder to drive a supporting beam to move upwards, respectively assembling two movable dies with a primary forming fixed die and a secondary forming fixed die, forming a primary core by the primary forming fixed die and one movable die, forming a secondary core by the secondary forming fixed die and the other movable die, and performing filling and forming operations on materials in the primary core to form a monochromatic product, wherein the secondary core is not operated; after the one-time forming, the lifting cylinder drives the supporting beam to move downwards, the two movable dies are opened, then the rotating motor works, the supporting beam is driven to rotate for 180 degrees through the mutually meshed driving teeth and the gear ring, and the two movable dies exchange positions; then the lifting cylinder drives the two movable dies to be matched with the dies again, the single-color product is still formed in the cavity corresponding to the primary forming fixed die, the secondary forming is carried out in the cavity corresponding to the secondary forming fixed die, and finally the double-color product is formed; after the operation is finished, the lifting cylinder drives the supporting beam to move downwards, the two movable dies are opened, the formed double-color product is ejected out of the cavity, the supporting beam is driven to rotate for 180 degrees again, and the operation is repeated.
The above prior art solutions have the following drawbacks: whole movable mould weight is bigger, rotates on a supporting beam and does linear motion, and the motion inertia of production is bigger, in order to rotate stably, just needs the bigger power supply of power to drive the cover half, and the power supply that power is littleer is difficult to stably drive, consequently, needs to improve the mould to the power supply work of the not equidimension power of adaptation.
Disclosure of Invention
In view of the defects in the prior art, a first object of the present invention is to provide a secondary injection molding mold, which reduces the size requirement of a power source on the basis of realizing secondary injection molding, saves power cost, and is adapted to power sources with different sizes.
The first invention of the present invention is realized by the following technical solutions:
the utility model provides a secondary injection moulding mould, includes movable mould and cover half, the cover half includes cover half benevolence, be provided with one shot forming cover half chamber and post forming cover half chamber on the cover half benevolence, the movable mould includes big mould benevolence and the little mould benevolence of fixed mounting on the movable mould of slidable mounting on the movable mould, big mould benevolence and little mould benevolence combination constitute one shot forming movable mould chamber and post forming movable mould chamber, just big mould benevolence with little mould benevolence laminating and mutual slidable, big mould benevolence is connected with rotary telescoping mechanism, behind the mould die sinking, under rotary telescoping mechanism's drive, big mould benevolence drives one shot forming product and breaks away from in the movable mould to rotatory 180, accomplish to reset after rotatory and get into in the movable mould to constitute one shot forming movable mould chamber and post.
By adopting the technical scheme, the movable die core is designed into the large die core and the lower die core, the large die core is only required to rotate 180 degrees to perform the injection molding process twice, the rest parts of the movable die and the small die core do not need to rotate, the requirement on the size of a power source of the rotary telescopic mechanism is reduced in movement, the cost of the power source is saved, and the movable die core and the power source are matched for working.
The present invention in a preferred example may be further configured to: the big mould benevolence is seted up along the hole that slides of mould open and shut mould direction extension, the hole that slides and little mould benevolence looks adaptation.
Through adopting above-mentioned technical scheme, the removal of the big mould benevolence of sliding hole pair plays the guide effect, makes the sliding of big mould benevolence more accurate, is difficult for producing the dislocation at the motion with the in-process that resets, and the adaptation precision is than higher, and is higher to the preparation required precision of mould benevolence.
The present invention in a preferred example may be further configured to: the inner wall protrusion in hole that slides is provided with a plurality of locating pieces that extend along hole length direction that slides, adjacent two be formed with the guide way of loudspeaker form between the locating piece, the guide way is close to the one end groove width of profiled surface and is less than the groove width of the other end, one side integrated into one piece of little mould benevolence has the complex guide block that slides with the guide way, the guide block is close to the one end width of profiled surface and equals the guide way is close to the groove width of profiled surface one end.
Through adopting above-mentioned technical scheme, through the mutual direction between locating piece and the guide way between little mould benevolence and the big mould benevolence, realize that the smooth and easy and correct direction of sliding between big and small mould benevolence, the groove width setting of guide way also is favorable to the locating piece and enters into the guide way in, the guarantee smooth and easy and efficiency of the motion fit that slides.
The present invention in a preferred example may be further configured to: the large die core is provided with a positioning groove, and the fixed die core is provided with a positioning bulge matched with the positioning groove.
Through adopting above-mentioned technical scheme, have accurate location effect between big mould benevolence and the cover half benevolence, make the shaping chamber on cover half benevolence and the cover half benevolence have better correspondence, can not produce the error, be favorable to behind the mould compound die, obtain the better shaping cavity of leakproofness and shaping effect.
The present invention in a preferred example may be further configured to: the movable mold is provided with a second groove matched with the large mold core, a positioning column extending along the mold opening direction of the mold is fixedly arranged in the second groove, and the large mold core is provided with a first positioning hole in positioning fit with the positioning column.
Through adopting above-mentioned technical scheme, the location installation between big mould benevolence and the movable mould is realized to the location reference column and the location cooperation in first locating hole, makes the position of big mould benevolence on the movable mould accurate, stable, rotates and linear motion back in big mould benevolence, through reference column and first locating hole, can be accurate reset to original position state, improves the stability, the accurate nature of big mould benevolence motion.
The present invention in a preferred example may be further configured to: an elastic copper sleeve is embedded in the first positioning hole and is in positioning fit with the positioning column.
Through adopting above-mentioned technical scheme, the rigid contact between reference column and the first locating hole can be offset off to the elasticity copper sheathing, can reduce and produce unnecessary wearing and tearing between first locating hole and the reference column, can offset some hard powers through elasticity, is favorable to that the mutual motion is more smooth and easy between first locating hole and the reference column, and is difficult for producing wearing and tearing, long service life.
The present invention in a preferred example may be further configured to: and a second positioning hole is formed in the fixed die core and is in positioning fit with one end, penetrating through the elastic copper sleeve, of the positioning column.
Through adopting above-mentioned technical scheme, the reference column passes behind the elasticity copper sheathing and the second locating hole location fit on the cover half benevolence, makes the three realize fine mutual positioning effect between cover half benevolence, movable mould and the big mould benevolence, makes the difficult dislocation that produces of three, is favorable to improving the corresponding precision of die cavity on the mould benevolence behind the mould compound die.
The present invention in a preferred example may be further configured to: the rotary telescopic mechanism comprises a driving column fixedly connected with the large die core, and waterway structures for cooling the primary molding movable die cavity and the secondary molding movable die cavity are arranged on the driving column and the large die core.
Through adopting above-mentioned technical scheme, waterway structure carries out the water-cooling to the product after the shaping, is favorable to the product shaping back fast curing shaping, improves injection moulding's efficiency to improve production efficiency.
The present invention in a preferred example may be further configured to: the waterway structure comprises a first waterway and a second waterway, wherein the first waterway is positioned on the driving column, the second waterway is positioned on the large mold core, and the first waterway is communicated with the second waterway.
Through adopting above-mentioned technical scheme, set up first water route on the drive post, be favorable to intaking in the second water route on big mould benevolence, make the mode of intaking more direct, swift, first water route on the drive post and the second water route on big mould benevolence are linked together, can realize the quick cooling of drive post and big mould benevolence.
One of the second objects of the present invention is to provide an injection molded article with good quality and high production efficiency.
The second object of the present invention is achieved by the following technical solutions:
an injection molding, by the aforesaid arbitrary a two shot moulding mould injection moulding form, the injection molding includes the body of moulding plastics by hard material injection moulding and by soft materials injection moulding's cushion, the cushion is located the central point of the body of moulding plastics and puts.
Through adopting above-mentioned technical scheme, form by above-mentioned secondary injection moulding mould injection moulding, fashioned efficient, and the power supply cost ratio that the mould produced the product consumption is lower, and product secondary injection moulding is efficient, moulds plastics in better sealed cavity, and the injection moulding product quality of obtaining is high, and can cool off fast after the product is moulded plastics out.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the invention optimizes the requirements of the secondary forming die on the size of the power source, saves the cost of the power source, can be matched with the power sources with different sizes to work, and achieves better secondary forming effect;
2. the fixed mold core, the large mold core and the movable mold are accurately positioned, so that a forming cavity with better sealing property can be obtained after the mold is closed, and the quality of an injection molded product is higher;
3. adopt waterway structure to carry out the water-cooling to big mould benevolence and drive post to realize the rapid cooling of product rapid prototyping and movable mould, be favorable to the quick beginning of mould injection moulding next time.
Drawings
FIG. 1 is an exploded view of the first embodiment, showing the overall construction of the mold;
FIG. 2 is a schematic structural view of a stationary platen and a stationary mold core according to an embodiment, showing the structure of a primary molding stationary mold cavity and a secondary molding stationary mold cavity on a stationary mold core;
FIG. 3 is an exploded view of the movable mold according to an embodiment, showing the structural shapes of the large mold core and the small mold core;
FIG. 4 is a schematic structural diagram of a middle and large mold core, a lower mold core and a driving column according to an embodiment, which is used for showing the structure of a primary molding movable mold cavity and a secondary molding movable mold cavity;
FIG. 5 is an exploded view of a large mold core and a small mold core according to an embodiment of the present invention, showing the fitting relationship between the large mold core and the small mold core;
FIG. 6 is an exploded view of the movable mold in the first embodiment, showing the construction of the driving column;
FIG. 7 is a schematic cross-sectional view of a middle mold and a rotary retractable mechanism according to an embodiment of the present invention, which is used to show that a large mold core is driven by the rotary retractable mechanism to rotate;
FIG. 8 is a first cross-sectional view of a large mold core and a driving post for showing the structure of a waterway structure according to a first embodiment;
FIG. 9 is a second cross-sectional view of the large mold core and the driving post according to the first embodiment, for showing the waterway structure of the large mold core;
fig. 10 is a schematic structural view of the second embodiment.
In the figure, 1, a fixed die; 11. a fixed die base; 12. fixing a template; 13. fixing a mold core; 14. a first groove; 15. molding a fixed mold cavity in one step; 16. secondary molding of the fixed mold cavity; 17. molding the casting hole at one time; 18. forming a nozzle in one step; 19. a first sprue bush; 110. a first hot runner plate; 111. secondary molding of the casting hole; 112. secondary molding of the nozzle; 113. a second sprue bush; 114. a second hot runner plate; 115. forming a bulge; 116. positioning the projection; 117. a second positioning hole; 2. moving the mold; 21. a movable mold base; 22. moving the template; 23. a movable mould core; 24. a second groove; 25. a large mold core; 26. a small die core; 27. a sliding hole; 28. forming a movable mold cavity in one step; 29. secondary molding of the movable mold cavity; 210. positioning blocks; 211. a guide groove; 212. a guide block; 213. a trough body; 214. a positioning groove; 215. a positioning column; 216. a first positioning hole; 217. an elastic copper sleeve; 218. a movable hole; 3. a rotary telescoping mechanism; 31. a drive column; 32. a rotating electric machine; 33. a telescopic oil cylinder; 34. rotating the disc; 41. a first waterway; 42. a second waterway; 43. a water inlet hole; 44. a water outlet hole; 45. a water outlet port; 46. a water inlet port; 47. a left side cooling channel; 48. a right side cooling channel; 49. a water inlet channel; 410. a water outlet channel; 51. injection molding the body; 52. an elastic pad; 53. and forming the groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1 and 2, the injection mold for secondary molding disclosed by the invention comprises a fixed mold 1 and a movable mold 2, wherein the fixed mold 1 comprises a fixed mold base 11, a fixed mold plate 12 and a fixed mold core 13, one side of the fixed mold base 11 facing the movable mold 2 is fixedly connected with the fixed mold plate 12, a first groove 14 is formed in a concave manner on the surface of one side of the fixed mold plate 12, the fixed mold core 13 is fixedly embedded in the first groove 14, a primary molding fixed mold cavity 15 and a secondary molding fixed mold cavity 16 are integrally formed on the surface of one side of the fixed mold core 13 facing the movable mold 2, and the primary molding fixed mold cavity 15 and the secondary molding fixed mold cavity 16 are different in shape and structure. The one-step molding die cavity 15 is provided with two one-step molding sprue holes 17, the fixed die base 11 is provided with one-step molding nozzles 18, the one-step molding nozzles 18 are communicated with the one-step molding sprue holes 17, the surface of one side of the fixed die 1, which is back to the movable die 2, is fixedly provided with a first sprue bush 19, the fixed die base 11 is provided with a first hot runner plate 110, the glue inlet end of a hot runner on the first hot runner plate 110 is communicated with the first sprue bush 19, the glue outlet end of the hot runner plate is communicated with the one-step molding nozzles 18, and hard injection molding materials in a molten state sequentially pass through the first sprue bush 19, the first hot runner plate 110, the one-step molding nozzles 18 and the one-step molding sprue holes 17 and enter the one-step molding die cavity.
Referring to fig. 1 and 2, the post-molding cavity 16 is provided with a post-molding gate 111, and the stationary mold base 11 is provided with a post-molding nozzle 112, the post-molding nozzle 112 communicating with the post-molding gate 17. A second sprue bush 113 is fixedly arranged on the surface of one side, back to the moving die 2, of the fixed die 1, a second hot runner plate 114 is arranged on the fixed die base 11, the glue inlet end of a hot runner on the second hot runner plate 114 is communicated with the second sprue bush 113, the glue outlet end is communicated with the secondary forming nozzle 112, and soft materials in a molten state sequentially pass through the second sprue bush 113, the second hot runner plate 114, the secondary forming nozzle 112 and the secondary forming sprue hole 111 and enter the secondary forming fixed die cavity 16.
Referring to fig. 2, the one-time molding cavity 15 includes a molding protrusion 115 located in a central region of the one-time molding cavity 15, the molding protrusion 115 protrudes from a surface of the one-time molding cavity 15, the molding protrusion 115 is rectangular, the one-time molding gate 17 is located at a central position of the molding protrusion 115, and a rectangular parallelepiped molding recess 53 (shown in fig. 10) is formed on a surface of the injection member by injection molding through the molding protrusion 115.
Referring to fig. 2, the fixed mold core 13 has positioning protrusions 116 integrally formed on the surface thereof, and the four positioning protrusions 116 protrude from the surface of the fixed mold core 13 and are uniformly distributed at the four side edges of the fixed mold core 13. The forming surface of the core insert 13 is recessed to form a second positioning hole 117, and the second positioning holes 117 are circular holes, two in number, and distributed between two opposite positioning protrusions 116.
Referring to fig. 3, the movable mold 2 includes a movable mold base 21, a movable mold plate 22 and a movable mold core 23, the movable mold base 21 and the movable mold plate 22 are fixedly connected through a bolt, the movable mold base 21 is located on one side of the bottom of the movable mold plate 22, a second groove 24 is formed in a surface of one side of the movable mold plate 22, which faces away from the movable mold base 21, the second groove 24 is a cuboid, the movable mold core 23 is installed in the second groove 24 and is matched with the second groove 24, and the movable mold core 23 and the second groove 24 slide with each other.
Referring to fig. 3 and 4, the movable mold core 23 includes a large mold core 25 and a small mold core 26, the large mold core 25 is a cuboid, the outer shape size of the large mold core 25 is the same as that of the fixed mold core 13, a sliding hole 27 penetrating through the bottom of the large mold core 25 is formed in the surface of the large mold core 25, the sliding hole 27 extends along the mold opening and closing direction of the mold, the number of the sliding holes 27 is four, and two of the sliding holes are relatively and uniformly distributed on the large mold core 25. The number of the small die inserts 26 is four, the small die inserts are fixedly arranged on the movable die plate 22 through bolts and correspond to the four sliding holes 27 one by one, and the side surfaces of the small die inserts 26 and the side surfaces of the sliding holes 27 are mutually attached and mutually matched in a sliding manner; two of the small mold cores 26 are disposed opposite to each other and combined with the large mold core 25 to form a primary molding movable mold cavity 28, and the other two small mold cores 26 are also disposed opposite to each other and combined with the large mold core 25 to form a secondary molding movable mold cavity 29.
Referring to fig. 3 and 4, the molding surface of the large mold core 25 is a rough surface, the molding surfaces of the small mold core 26 and the fixed mold core 13 are smooth surfaces, and a certain viscosity exists between the large mold core 25 and the injection molded product, which is greater than the viscosity between the product and the small mold core 26 and the fixed mold core 13.
Referring to fig. 2 and 4, the surface of the large mold core 25 is recessed to form four positioning grooves 214, the four positioning grooves 214 are uniformly distributed at the peripheral edge of the large mold core 25, and the positioning grooves 214 are in positioning fit with the positioning protrusions 116 on the fixed mold core 13.
Referring to fig. 3, a positioning post 215 is fixedly disposed on the second groove 24, and is cylindrical and extends along the mold opening and closing direction of the mold, one end of the positioning post 215 is fixedly embedded in a hole on the second groove 24, a first positioning hole 216 is disposed on the large mold core 25 in a penetrating manner, the first positioning hole 216 extends along the mold opening and closing direction of the mold, an elastic copper sleeve 217 is fixedly embedded in the first positioning hole 216, the elastic copper sleeve 217 is made of an elastic copper material and is cylindrical, the elastic copper sleeve 217 is in positioning fit with the positioning post 215, and the positioning post 215 passes through one end of the elastic copper sleeve 217 and is in positioning fit with a second positioning hole 117 on the molding surface of the fixed mold core 13.
Referring to fig. 5, the inner wall of the sliding hole 27 is provided with two positioning blocks 210 extending along the length direction of the sliding hole 27 in a protruding manner, the positioning blocks 210 are in the shape of an inverted isosceles trapezoid, a horn-shaped guide groove 211 is formed between two adjacent positioning blocks 210, the groove width of one end of the guide groove 211 close to the molding surface of the movable mold insert 23 is smaller than that of the other end, a guide block 212 is integrally molded on one side of the small mold insert 26, the guide block 212 is in a long strip shape, and the groove width of one end close to the molding surface of the movable mold insert 23 is smaller than that of the other end. And the side of the small mold core 26 is recessed at two sides of the guide block 212 to form a groove 213, the shape and size of the groove 213 is matched with the shape and size of the positioning block 210, the groove 213 is in sliding fit with the positioning block 210, the small mold core 26 is matched with the large mold core 25 through the sliding hole 27 and is in sliding fit with the large mold core 25 in the mold opening and closing direction of the mold.
Referring to fig. 6 and 7, the movable mold 2 is provided with a movable hole 218 penetrating from the movable mold base 21 to a side surface of the movable mold core 23, and the movable hole 218 is cylindrical and extends in the mold opening and closing direction of the mold; the rotary telescopic mechanism 3 comprises a driving column 31, a rotary motor 32, a telescopic oil cylinder 33 and a rotary disk 34, the driving column 31 is cuboid, one end of the driving column extends into the movable mold 2 through a movable hole 218 and is fixed with one side of the large mold core 25, which is back to the fixed mold core 13, through a bolt, the axis of the large mold core 25, the axis of the movable hole 218 and the axis of the driving column 31 coincide with each other, the length of a diagonal line of one end face of the driving column 31 is smaller than the diameter of the movable hole 218, and the end part, far away from the large mold core 25, of the driving column 31 protrudes out of the movable mold base 21.
Referring to fig. 7, the driving rod of the telescopic cylinder 33 and the end of the driving column 31 far away from the large mold core 25 are coaxially fixed, and the driving rod of the telescopic cylinder 33 coincides with the axis of the driving column 31, and the telescopic cylinder 33 can drive the large mold core 25 to move in the mold opening and closing direction of the mold; the cylinder body of the telescopic oil cylinder 33 is fixedly arranged at the center of the rotating disc 34, the opposite side of the rotating disc 34, which is provided with the telescopic oil cylinder 33, is coaxially fixed with the motor shaft of the rotating motor 32, the rotating motor 32 works to drive the rotating disc 34 to rotate, so that the telescopic oil cylinder 33 is driven to rotate on the rotating disc 34 to drive the driving column 31 to rotate, and the rotation angle is 180 degrees each time. After the mold is opened, the telescopic oil cylinder 33 works to drive the large mold core 25 to be separated from the second groove 24, and then the rotating motor 32 works to drive the rotating disc 34, the telescopic oil cylinder 33 and the driving column 31 to rotate, so that the large mold core 25 is driven to rotate, and the rotating angle is 180 degrees.
Referring to fig. 8 and 9, the driving column 31 and the cavity 25 are provided with a water path structure for injecting water and cooling the primary molding movable mold cavity 28 and the secondary molding movable mold cavity 29, the water path structure includes a first water path 41 disposed on the driving column 31 and a second water path 42 disposed on the cavity 25, and the first water path 41 is communicated with the second water path 42. The first water channel 41 comprises a water inlet 43, a water outlet 44, a water inlet channel 49 and a water outlet channel 410, wherein the water inlet 43 is arranged on one side wall of the driving column 31, the water inlet 43 is communicated with one end of the water inlet channel 49, the other end of the water inlet channel 49 is communicated with the water inlet port 46 of the second water channel 42, the water outlet 44 is arranged on one side wall of the driving column 31, which is opposite to the water inlet 43, the water outlet 44 is communicated with one end of the water outlet channel 410, and the other end of the water outlet channel 410 is communicated with the water outlet port 45 of the second water channel 42.
Referring to fig. 8 and 9, the second water path 42 includes a water outlet port 45, a water inlet port 46, a left cooling channel 47 and a right cooling channel 48 disposed on the core insert 25. The left cooling channel 47 is formed by a rectangular channel, the right cooling channel 48 is also formed by a rectangular channel, the left cooling channel 47 and the right cooling channel 48 are symmetrically arranged along the center line of the large die core 25 in the length direction, one end of the left cooling channel 47 is communicated with the water inlet port 46, the other end of the left cooling channel 47 is communicated with one end of the right cooling channel 48, the other end of the right cooling channel 48 is communicated with the water outlet port 45, and cooling water enters the left cooling channel 47 from the water inlet port 46, flows into the right cooling channel 48 from the left cooling channel 47, flows out from the water outlet port 45, and enters the driving column 31. The cooling water enters the large mold core 25 through the first water channel 41 and the second water channel 42 to cool the injection molded product.
The working principle and process of secondary molding injection molding are as follows:
during one-step molding, the movable mold 2 and the fixed mold 1 are assembled, the large mold core 25 is located in the second groove 24, the one-step molding movable mold cavity 28 and the one-step molding fixed mold cavity 15 are combined into two sealed injection molding cavities, hard material materials in a molten state sequentially pass through the first sprue bush 19, the first hot runner plate 110, the one-step molding nozzle 18 and the one-step molding sprue hole 17 in sequence and enter between the two one-step molding fixed mold cavities 15 and the one-step molding movable mold core 23, injection molding products with corresponding shape structures are molded according to the shape structures of the one-step molding fixed mold cavity 15 and the one-step molding movable mold cavity 28, at the moment, one-step injection molding is completed, and a molding groove 53 is formed in the center of the one-step injection molding products.
After the one-time molding is completed, the movable mold 2 and the fixed mold 1 are opened and separated, the movable mold core 23 is fixed on the movable mold 2, and therefore the movable mold core and the movable mold 2 move together in the direction away from the fixed mold 1, after the one-time molding, an injection molded product is adhered to the movable mold core 23 and moves together with the movable mold core 23, after the mold opening is completed, the telescopic oil cylinder 33 in the rotary driving mechanism works to drive the movable mold core 23 to approach the fixed mold core 13 in the mold opening and closing direction.
The sliding hole 27 and the small die core 26 slide relatively, the large die core 25 takes a product to move out of the second groove 24 through viscosity, then the rotating disc 34, the telescopic oil cylinder 33 and the driving column 31 rotate 180 degrees in an autorotation mode under the driving of the rotating motor 32, then the telescopic oil cylinder 33 works again to drive the large die core 25 to move linearly and reset, the large die core 25 enters the movable die 2, the sliding hole 27 in the large die core 25 is in positioning fit with the small die core 26, and after the reset is completed, the molding surface of the large die core 25 and the molding surface of the small die core 26 are combined together to form a primary molding movable die cavity 28 and a secondary molding movable die cavity 29 again; then the whole movable die 2 including the movable die core 23 moves together and is matched with the fixed die 1.
After the dies are closed, a sealed secondary forming chamber is formed between the movable die core 23 and the fixed die core 13, and then the soft material in a molten state sequentially passes through the second sprue bush 113, the second hot runner plate 114, the secondary forming nozzle 112 and the secondary forming sprue hole 111 and enters the secondary forming chamber.
The soft material is injected into the forming groove 53 of the center position of the product through the secondary forming pouring hole 111 to form the injection forming of the soft material, after the secondary forming is completed, the movable die 2 moves to open the formed cavity, the formed product moves together with the movable die core 23 to be away from the fixed die 1, the secondary forming injection molding is completed at the moment, and the product after the secondary forming injection molding is taken out.
Example two:
referring to fig. 10, an injection molded article is injection molded according to the first embodiment, and includes an injection molded body 51 injection molded from a hard material, which is an ABS engineering plastic material, i.e., PC + ABS (engineering plastic alloy), and an elastic pad 52 injection molded from a soft material, which has both excellent heat and weather resistance, dimensional stability, and impact resistance of a PC resin and excellent processing flowability of an ABS resin; the soft material is TPS-SEPS thermoplastic elastomer, and has high elasticity, aging resistance and oil resistance. The injection body 51 is provided at a central position thereof with a rectangular parallelepiped-shaped molding groove 53, and the elastic pad 52 is integrally molded with the molding groove 53, and in this embodiment, the elastic pad 52 is injected into the molding groove 53 by secondary molding and cured in the molding groove 53 to form the rectangular parallelepiped-shaped elastic pad 52.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a secondary injection moulding mould, includes movable mould (2) and cover half (1), cover half (1) is including cover half benevolence (13), be provided with one shot forming cover half chamber (15) and secondary molding cover half chamber (16) on cover half benevolence (13), its characterized in that: the movable mould (2) comprises a large mould core (25) and a small mould core (26), wherein the large mould core (25) is slidably mounted on the movable mould (2), the small mould core (26) and the large mould core (25) are combined to form a once-forming movable mould cavity (28) and a twice-forming movable mould cavity (29), the large mould core (25) and the small mould core (26) are attached and can slide mutually, the large mould core (25) is connected with a rotary telescopic mechanism (3), after the mould is opened, under the driving of the rotary telescopic mechanism (3), the large mould core (25) drives a once-forming product to be separated from the movable mould (2) and rotate 180 degrees, and the once-forming movable mould cavity (28) and the twice-forming movable mould cavity (29) are formed by resetting after the rotation and then entering the movable mould (2) and recombining with the small mould core (26).
2. The two-shot molding mold of claim 1, wherein: the large mold core (25) is provided with a sliding hole (27) extending along the mold opening and closing direction of the mold, and the sliding hole (27) is matched with the small mold core (26).
3. The two-shot molding apparatus of claim 2, wherein: the inner wall protrusion of hole (27) that slides is provided with a plurality of locating pieces (210) that extend along hole (27) length direction that slides, adjacent two be formed with tubaeform guide way (211) between locating piece (210), the one end groove width that guide way (211) are close to the profiled surface is less than the groove width of the other end, one side integrated into one piece of little mould benevolence (26) has guide block (212) with guide way (211) complex that slides, the one end width that guide block (212) are close to the profiled surface equals the groove width that guide way (211) are close to profiled surface one end.
4. The two-shot molding mold of claim 1, wherein: the large die core (25) is provided with a positioning groove (214), and the fixed die core (13) is provided with a positioning bulge (116) matched with the positioning groove (214).
5. The two-shot molding mold of claim 1, wherein: the die is characterized in that a second groove (24) matched with the large die core (25) is formed in the movable die (2), a positioning column (215) extending along the die opening direction of the die is fixedly arranged in the second groove (24), and a first positioning hole (216) matched with the positioning column (215) in a positioning mode is formed in the large die core (25).
6. The two-shot molding apparatus of claim 5, wherein: an elastic copper sleeve (217) is embedded in the first positioning hole (216), and the elastic copper sleeve (217) is matched with the positioning column (215) in a positioning mode.
7. The two-shot molding apparatus of claim 6, wherein: the fixed die core (13) is provided with a second positioning hole (117), and the second positioning hole (117) is matched with one end, penetrating through the elastic copper sleeve (217), of the positioning column (215) in a positioning mode.
8. The two-shot molding mold of claim 1, wherein: the rotary telescopic mechanisms (3) and (3) comprise driving columns (31) fixedly connected with the large die core (25), and water channel structures for cooling the primary forming movable die cavity (28) and the secondary forming movable die cavity (29) are arranged on the driving columns (31) and the large die core (25).
9. The two-shot molding apparatus of claim 8, wherein: the waterway structure comprises a first waterway (41) positioned on the driving column (31) and a second waterway (42) positioned on the large die core (25), and the first waterway (41) is communicated with the second waterway (42).
10. An injection molding characterized in that: injection-molded from a two-shot injection-molding mold according to any one of claims 1 to 9, the injection-molded part comprising an injection-molded body (51) injection-molded from a hard material and an elastic pad (52) injection-molded from a soft material, the elastic pad (52) being located in the center of the injection-molded body (51).
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| CN114347378A (en) * | 2021-12-31 | 2022-04-15 | 昆山市鸿毅达精密模具有限公司 | Double-color injection molding mold for automobile sealing strip |
| CN116198063A (en) * | 2023-05-06 | 2023-06-02 | 宁海县第一注塑模具有限公司 | Die with adjustable compacting force |
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| CN111605140B (en) | 2022-02-18 |
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