WO2017166543A1

WO2017166543A1 - Surrounding layered injection molding method for thick-wall plastic parts, mold structure therefor and lens product

Info

Publication number: WO2017166543A1
Application number: PCT/CN2016/090384
Authority: WO
Inventors: 魏霓; 朱叶琪; 李明
Original assignee: 上海小糸车灯有限公司
Priority date: 2016-04-01
Filing date: 2016-07-19
Publication date: 2017-10-05

Abstract

Disclosed are a surrounding layered injection molding method for thick-wall plastic parts, a mold structure therefor and a lens product. With an intermediate plate (230) arranged between a fixed mold plate (210) and a movable mold plate (220), the intermediate plate (230) is rotated to perform a core rotation operation. An intermediate cavity (231) in a hollow state after piece removal is transferred to a first working station and then the mold is closed to form a molding cavity for a primary molded product. The intermediate plate (230) carrying the primary molded product (101) is rotated to a second working station and then the mold is closed to form a molding cavity for overmolding that surrounds the primary molded product (101) on both sides so as to achieve a multi-layer injection. Collapses in a first layer are fed at a second layer injection so as to ensure uniform solidification and contraction and a fully filled outline of an overmolded product, meeting the optical performance requirements of a headlamp lens (100), shortening the production cycle and increasing the efficiency of injection molding production.

Description

Thick-walled plastic enveloping layered injection molding method, die structure and galvanometer product

Technical field

The present invention relates to an injection molded product of a plastic or plastic state substance and a method and apparatus for manufacturing the same, and more particularly to a surrounding layered injection molding method for a thick-walled injection molded product and a dedicated mold structure for carrying out the method, and a method of manufacturing the same Headlights with light mirror products.

Background technique

At present, the LED headlamps have begun to become the trend of automotive headlamp design. Due to the existence of numerous electronic units in the LED headlights, the weight control of the whole lamp is required, and the weight reduction of the components becomes the most important method. Due to the complex geometry of lenses, light guides and mirrors in automotive luminaires, it is most feasible to replace traditional glass optics with PC materials (polycarbonate plastics) or BMC materials (spheroidal molding compounds). PC replacement of glass can reduce parts near Half the weight. However, since the headlight lens is a thick-walled member, as shown in Fig. 1 and Fig. 2, the approximate size of the product is usually controlled to be 40 to 60 mm long, 40 to 60 mm wide, and 25 to 32 mm thick, and the thickest portion thereof. The thickness H0 is close to 9 times that of a conventional PC piece. The existing one-shot injection molding method and equipment are used to manufacture thick-walled lenses. Since the primary type core cannot be replenished, the upper and lower surfaces of the primary type may be sucked during the cooling process, and defects such as product shrinkage holes and dents are easily formed. The optical performance requirements of the headlamp lens cannot be met.

The Chinese invention patent application "an ultra-thick-wall transparent plastic injection molding method" (invention patent application number: 201310342435.X application publication number: CN104339534A) discloses an ultra-thick-wall transparent plastic injection molding method, comprising the following steps: First step, equal wall thickness design; second step, mold preparation; third step, one injection; fourth step, secondary molding; the ultra thick-walled transparent plastic injection molding method of the invention adopts Moldflow CAE analysis technology The wall thickness design of the ultra-thick transparent plastic parts with a wall thickness of 60 mm or more is made by two injection moldings in two sets of molds. The injection molding is carried out by high-temperature and high-pressure injection molding, and the higher mold temperature and the external conditions of two injection moldings are used to obtain the final product. China utility model patent "a double injection mold for thick-walled light guide injection molding" (utility model patent number: ZL201520087072.4 authorization announcement number: CN204658827U) discloses a double-injection mold for thick-walled light guide injection molding, the injection molding The mold is a double-layer injection mold, and the injection mold includes a fixed plate and a rotating disk constituting a support frame, a fixed template supported between the fixed plate and the rotating plate, a first movable template and a second movable template. The first and second injection moldings for light guide molding are respectively formed on opposite sides of the template a cavity wall, the first movable template having a first molding cavity wall, the second movable template having a second molding cavity wall, the first molding cavity wall constituting a first injection molding cavity, and the second molding cavity The wall constitutes a second injection molding cavity. The above prior art solution can be formed by dividing the thick layer injection molded part into two thin layers, so that the plastic part can be formed faster and the ultra thick transparent plastic part can be obtained, and the shrinkage and dent of the product can be eliminated by the double injection molding. Defects such as weld lines improve product quality and product yield. However, the existing thick-walled injection molded part produced by the layer injection molding method is a covering structure, as shown in FIG. 3, the finished secondary type 102 covers the upper surface of the primary type 101, because of the primary type during the primary cooling process. The suction dent formed on the lower surface cannot be filled during the overmolding process, and the product still cannot meet the optical performance requirements of the headlamp lens.

Summary of the invention

The object of the present invention is to provide a thick-walled layered injection molding method capable of satisfying the injection molding of a thick-walled part and satisfying the optical performance of the component, so as to solve the problem that the optical performance of the thick-walled lens manufactured by the existing injection molding method and equipment cannot meet the design requirements. technical problem. The technical solution adopted by the present invention to solve the above technical problems is:

A thick-walled plastic-enclosed layered injection molding method for realizing layered injection molding of thick-walled plastic parts by using a common rotary mold on a general rotary type injection molding machine, characterized in that:

Configuring an intermediate plate for performing a function of a transfer core between a fixed template of the turntable mold and the movable template;

The thick-walled plastic-enclosed layered injection molding method includes the following injection molding operation steps:

S10: rotating the intermediate plate to rotate the intermediate cavity in the cavity state to the first station, clamping between the fixed template I cavity and the movable template I cavity, and clamping the mold to form the product primary molding cavity;

S20: opening the injection valve of the first station to perform one-shot injection molding of the product, and the primary type formed by injection molding is left on the intermediate cavity to form an intermediate plate carrying the product primary type;

S30: performing mold opening and picking operation after the temperature reaches the mold opening temperature, and discharging the finished product of the secondary injection molding in the previous injection molding cycle from the intermediate cavity;

S40: rotating the intermediate plate to perform the core-turning operation, and clamping the mold after the core is in position: the intermediate cavity in the cavity state after the taking operation is turned to the first station, and is clamped in the fixed template I cavity and the movable template I cavity. Between, after re-closing, the product is formed into a molding cavity; at the same time, the intermediate plate carrying the product primary type is rotated to the second station, clamped between the fixed template II cavity and the movable template II cavity, and clamped again. After forming a secondary molding cavity surrounded by the primary sides of the product;

S50: opening the injection valve of the second station to perform secondary injection molding of the product, and simultaneously injecting the high temperature injection plastic into the two sides of the intermediate plate carrying the product primary type to form a secondary type of the surrounding structure;

If all the injection molding operations are completed, the process proceeds to step S60, otherwise, the process returns to step S20, and the surrounding layered injection molding continuous operation is repeated cyclically;

S60: After the temperature reaches the mold opening temperature, the mold opening and taking operation is performed, and the finished product of the secondary injection molding is ejected from the intermediate cavity.

A preferred technical solution of the thick-walled plastic enveloping layer injection molding method of the present invention is characterized in that the mold opening temperature is set to the glass transition temperature of the PC injection molding compound.

A better technical solution of the thick-walled plastic part-enclosed layered injection molding method of the invention is characterized in that the secondary injection molding mold adopts a high mold temperature to ensure smooth filling of the injection plastic, and appears on both sides of the primary type. The suction sag can be supplemented at the same time.

An improved technical solution of the thick-walled plastic part enveloping layer injection molding method of the present invention is characterized in that the temperature of the injection molding plastic is to ensure that the secondary type of injection heat can heat and melt the outer surface of the primary condensation layer into a molten state. Thereby avoiding product delamination defects.

Another object of the present invention is to provide a special mold structure specially designed for implementing the above-described enveloping layer injection molding method, which can realize the enveloping layer injection molding by executing the mold core through the in-mold structure of the mold, and the invention solves the problem The technical solutions adopted by the above technical problems are:

A mold core mold structure for the above-mentioned thick-walled plastic-enclosed layered injection molding method, which is used for an injection mold of a general-purpose rotary injection molding machine, including a first station for performing one-shot molding and a secondary injection molding The second station is characterized in that: a rotatable intermediate plate is arranged between the fixed template of the rotary table mold and the movable template, and the product formed by injection molding at the first station is transferred to the second station by rotating the intermediate plate. Implementing a mold core function of the injection mold; the set template includes at least one pair of fixed template I cavity and fixed template II cavity; the movable template includes at least one pair of movable template I cavity and movable template II matched with the fixed template The intermediate plate comprises an intermediate cavity corresponding to the fixed template and the movable template cavity, and the intermediate cavity in the cavity state is sandwiched between the fixed template I cavity and the movable template I cavity, and the clamping form constitutes a primary molding of the product. Cavity; an intermediate plate containing a product primary type formed after one-shot injection, sandwiched between a fixed template II cavity and a movable template II cavity, and the clamping mold constitutes a secondary molding cavity surrounded by the primary side of the product.

A preferred technical solution of the mold core mold structure of the present invention is used in a duplex four-cavity injection mold, characterized in that: the fixed template comprises two fixed template I cavities at a first station. And two fixed template II cavities located in the second station; the movable template comprises two movable template I cavities paired with the fixed template I cavities, and two movable template II cavities paired with the fixed template II cavities; The intermediate plate includes four intermediate cavities, and the four intermediate cavities rotate between the first station and the second station by rotating the intermediate plate; the intermediate plate is sandwiched between the fixed template and the movable plate The mold clamping forms two sets of one-time forming cavity and two sets of secondary forming cavities.

A better technical solution of the mold core mold structure of the present invention is characterized in that: the intermediate plate adopts a separate structure having only one intermediate cavity on each intermediate plate; corresponding to a double cavity or a four cavity injection mold Each set of molding chambers is provided with a separate intermediate plate.

A preferred technical solution of the mold core mold structure of the present invention is characterized in that the primary and secondary shapes of the product adopt unequal wall thickness design, and the wall thickness of the secondary type satisfies the secondary molding cavity thin The requirements of the wall treatment can ensure the uniform condensation and shrinkage of the secondary type of the product and fill the shape full, satisfying the optical performance requirements of the headlight lens; the thickness of the primary type depends on the total thickness of the injection molded product and the secondary type. Wall thickness.

It is still another object of the present invention to provide an automotive headlamp light illuminator manufactured by the above-described enveloping layered injection molding method, which is used to meet the needs of the ever-changing LED headlamp development, and the present invention solves the above technical problems. The technical solution is:

An automotive headlamp light illuminator manufactured by the above-mentioned thick-walled plastic-enclosed layered injection molding method, wherein a lens body is formed by injection molding of a PC material, wherein the lens body is formed by a primary injection molding core And a secondary type consisting of two sides on the inner core; the secondary type of injection plastic is fully filled with the suction recesses appearing on both sides of the inner core during the cooling process of the inner core, forming an optical which satisfies the lens of the headlight The light-incident surface and the light-emitting surface required for performance; the secondary type of injection heat completely fused the outer surface of the primary condensation layer with the inner surface of the condensation layer formed during the secondary injection molding to form an integrated lens body without delamination.

A preferred embodiment of the automotive headlamp lens of the present invention is characterized in that the total thickness of the lens body is 25 to 32 mm, and the wall thickness of the secondary type is 3 to 6 mm.

The beneficial effects of the invention are:

1. The thick-walled plastic part-enclosed layered injection molding method of the invention, the mold structure thereof and the light distribution mirror product, adopts a rotary mold core structure to realize multi-layer injection molding, and the suction on the first layer is performed in the second layer injection molding. The shrinkage ensures the uniform condensation and shrinkage of the secondary type of the product and fills the shape to meet the optical performance requirements of the headlamp lens.

2. The thick-walled plastic part-enclosed layered injection molding method, the mold structure thereof and the light distribution mirror product of the invention are formed by dividing the thick layer into a thin layer, so that the wall thickness of the secondary type can satisfy the thin wall of the secondary molding cavity. The requirements of the treatment process can accelerate the cooling process, thereby shortening the production cycle and improving production efficiency.

DRAWINGS

Figure 1 is a three-view view of one embodiment of a car headlight lens;

2 is a schematic cross-sectional view of a headlight of a car headlight;

3 is a schematic view showing a covering structure of a thick-walled lens product manufactured by the prior layer injection molding method;

4 is a schematic structural view of a headlight of a motor vehicle manufactured by the surrounding layered injection molding method of the present invention;

Figure 5 is a schematic view showing the molding principle of the thick-walled plastic-enclosed layered injection molding method of the present invention;

6 is a schematic side view of a movable mold of a rotary mold core mold structure used in the above-described surrounding layer injection molding method;

7 is a schematic view of a double-cavity mold intermediate plate for a rotary mold core mold structure of the above-described surrounding layer injection molding method;

Figure 8 is a schematic side view of a fixed mold core mold structure for the above-described surrounding layer injection molding method;

9 is a schematic view of a four-cavity mold intermediate plate used in the above-described enveloping layer injection molding method;

Figure 10 is a flow chart showing the injection molding operation of the thick-walled plastic-enclosed layered injection molding method of the present invention;

Figure 11 is a schematic view of a single injection molding of the thick-walled plastic-enclosed layered injection molding method of the present invention;

Figure 12 is a schematic view showing the action of the transfer mold core of the thick-walled plastic part enclosing type injection molding method of the present invention;

Fig. 13 is a schematic view showing the secondary injection molding of the thick-walled plastic-enclosed layered injection molding method of the present invention.

The reference numerals of the components in the above figures: 100-thick-wall lens (automotive headlight lens), 101-primary type, 1011-secondary type outer surface of the first condensation layer melted during injection molding, 102- Secondary type (covering layer), 103-secondary type (envelope layer), injection flow at 1030-secondary injection molding, condensing layer formed with primary type during 1031-secondary injection molding, 1032-secondary injection molding The condensation layer formed with the mold, 210-set template, 211-set template I cavity, 212-set template II cavity, 220-moving template, 221-moving template I cavity, 222-moving template II cavity, 230-intermediate plate , 231-intermediate cavity, 232- carries the intermediate plate of the product type, 300-manipulator.

detailed description

In order to better understand the above technical solutions of the present invention, further details are described below in conjunction with the accompanying drawings and embodiments.

The thick-walled plastic part enclosing layer injection molding method of the invention is used for realizing layered injection molding of thick-walled plastic parts on a common rotary type injection molding machine; the template 210 and the movable template of the rotary mold The intermediate plate 230 performing the function of the rotary core is disposed between the 220s. As shown in the embodiment of FIG. 10, the method for enclosing the layered injection molding of the thick-walled plastic part comprises the following steps:

S10: Rotating the intermediate plate 230 by the robot 300, transferring the intermediate cavity 231 in a cavity state to the first station, clamping between the fixed template I cavity 211 and the movable template I cavity 221, and clamping the product to form a product once molding Cavity

S20: Opening the injection valve of the first station to perform one-shot injection molding of the product, and the primary type formed by injection molding is left on the intermediate cavity 231 to form an intermediate plate 232 carrying the product primary type; as shown in FIG.

S30: performing mold opening and picking operation after the temperature reaches the mold opening temperature, and discharging the finished product of the secondary injection molding in the previous injection molding cycle from the intermediate cavity 231;

S40: rotating the intermediate plate 230 by the robot 300 to perform a core-turning operation, and clamping the mold after the core is in position: the intermediate cavity 231 in a cavity state after the pick-up operation is turned to the first station, and clamped in the fixed template I cavity 211 Between the movable template I cavity 221 and the mold clamping again, the product forming cavity is formed; at the same time, the intermediate plate 232 carrying the product primary type is rotated to the second station, and clamped in the fixed template II cavity 212 and moving Between the template II chambers 222, after re-molding, a secondary molding cavity surrounded by the primary sides of the product is formed; FIG. 12 is a thick-walled plastic enveloping layered injection molding method of the present invention. The schematic diagram of the action of the transfer core, this step uses the robot 300 to grab the intermediate plate 230 and rotate, and performs a core-turning operation, and the intermediate cavity 231 which is in a cavity state after the pick-up operation is exchanged with the intermediate plate 232 carrying the product primary type. position.

S50: opening the injection valve of the second station to perform secondary injection molding of the product, and simultaneously injecting the high temperature injection plastic into the two sides of the intermediate plate 232 carrying the product primary type to form a secondary type of the surrounding structure; Figure 13;

S60: After the temperature reaches the mold opening temperature, the mold opening and taking operation is performed, and the finished product of the secondary injection molding is ejected from the intermediate chamber 231.

The molding principle of the thick-walled plastic part-enclosed layered injection molding method of the present invention is as shown in FIG. 5, and the injection molding method similar to “sandwich” is used to first inject the core of the product at the first station in the one-shot molding process, and then By adopting the enveloping layered injection molding method of the present invention, the product once formed in the first station is transferred to the second station, and the light incident surface and the light exit surface of the product are simultaneously injected in the secondary injection molding process, that is, The effect of three-layer injection molding is achieved by two injection moldings. Taking PC material as an example, as the temperature T rises, the density σ of the PC material decreases, and for ordinary PC materials, the melting point is T=240 °C. The PC material will have a condensation layer near the metal wall during the filling process. Since the plastic is a poor conductor of heat, the mold opening temperature is usually set to the glass transition temperature of the PC material (for example, 140 ° C), at which time the core temperature of the product. It will still be as high as 200 ° C, forming an incompletely cooled core. After the mold is opened, the plastic exchanges heat with the air. The primary type 101 will slowly solidify from the surface layer to the core. Since the PC is a poor conductor of heat, the heat conduction process is slow. Since the core of the primary type 101 cannot be replenished, it may cause suction on the primary surface during the cooling process. After the mold is opened, the primary product 101 is moved to the second station for secondary injection molding. The injection mold adopts a high mold temperature to ensure smooth filling of the injection plastic, and the flow forward of the injection molding plastic flows into and fills the secondary molding cavity. The entire filling process is as shown in FIG. 5. The condensing layer 1032 formed with the mold during the secondary injection molding sufficiently conforms to the

molds

210 and 220, and the secondary type of injection heat heats and melts the condensation layer 1011 of the primary type 101 into a molten state. It is integrated with the condensation layer 1031 formed during the secondary injection molding to avoid product delamination. At the same time, the secondary type is thinned on the wall thickness (relative to the primary type) to ensure full filling during the injection molding process.

According to an embodiment of the thick-walled plastic enveloping layer injection molding method of the present invention, the mold opening temperature is set to the glass transition temperature of the PC injection molding compound.

According to the embodiment of the thick-walled plastic-enclosed layered injection molding method of the present invention, the secondary injection molding mold adopts a high mold temperature to ensure smooth filling of the injection plastic, and the suction depressions appearing on both sides of the primary type can be simultaneously performed. Feeding.

According to the embodiment of the thick-walled plastic enveloping layer injection molding method of the present invention, the temperature of the injection molding plastic is such that the secondary type of injection heat can heat and melt the outer surface 1011 of the primary condensation layer into a molten state, thereby avoiding product division. Layer defects.

6 to 8 are an embodiment of a rotary core mold structure for a thick-walled plastic-enclosed layered injection molding method of the present invention, and an injection mold for a general-purpose rotary injection molding machine, in which FIGS. 6 to 8 In the illustrated embodiment, the injection mold is a two-chamber two-station rotary mold, including a first station for performing one-shot injection molding and a second station for performing secondary molding; a fixed template 210 and a movable template 220 for the rotary mold Between the rotatable intermediate plate 230, the intermediate plate 230 is rotated by the robot 300, and the product formed by the first station injection molding is transferred to the second station to realize the function of the rotary mold core of the injection mold; The template 210 includes at least one pair of fixed template I cavity 211 and fixed template II cavity 212; the movable template 220 includes at least one pair of movable template I cavity 221 and movable template II cavity 222 paired with the fixed template 210; The plate 230 includes an intermediate cavity 231 corresponding to the fixed template and the movable template cavity, and the intermediate cavity 231 in a cavity state is sandwiched between the fixed template I cavity 211 and the movable template I cavity 221, and the mold clamping constitutes a primary molding cavity of the product. One-shot injection molding Between the plates 232, interposed between the stationary platen and the movable platen 212 II II chamber cavity 222, mold clamping type in a configuration surrounding the sides 101 of the secondary-molding cavity products.

According to another embodiment of the rotary core mold structure of the thick-walled plastic-enclosed layered injection molding method according to the present invention, the rotary mold core mold structure is used for a double-station four-cavity injection mold, and FIG. 9 is an embodiment of the present invention. Schematic diagram of a four-cavity injection mold intermediate plate of a rotary mold core mold structure, the fixed template 210 includes two fixed template I cavities 211 at a first station, and two fixed templates II at a second station The movable template 220 includes two movable template I cavities 221 paired with the stationary template I cavity 211, and two movable template II cavities 222 paired with the stationary template II cavities 212; the intermediate plate 230 includes Four intermediate chambers 231, by rotating the intermediate plate 230, the four intermediate chambers 231 are rotated between the first station and the second station; the intermediate plate 230 is sandwiched between the fixed template 210 and the movable template 220 During the process, the mold clamping forms two sets of one-time forming cavity and two sets of secondary forming cavities. By adopting the rotary mold core mold structure of the embodiment, it is possible to simultaneously perform injection molding of two product primary types and two product secondary types in one injection molding cycle, thereby doubling the injection molding production efficiency.

According to another embodiment of the rotary core mold structure of the thick-walled plastic enveloping layer injection molding method according to the present invention, the intermediate plate 230 adopts a separate structure having only one intermediate cavity 231 on each intermediate plate 230; A separate intermediate plate 230 is disposed in each of the forming chambers of the dual or four cavity injection mold.

According to a preferred embodiment of the rotary core mold structure of the thick-walled plastic-enclosed layered injection molding method of the present invention, the primary type 101 and the secondary type 103 of the product are of unequal wall thickness design, and the secondary type 103 The wall thickness H2 satisfies the requirements of the thinning treatment of the secondary molding cavity, and can ensure uniform condensation and shrinkage of the secondary type of the product and full filling of the shape, and meet the optical performance requirements of the headlight lens; the thickness H1 of the primary type 101 It depends on the total thickness H0 of the injection molded product and the wall thickness H2 of the secondary type 103.

One embodiment of an automotive headlamp light illuminator manufactured by the surrounding layered injection molding method of the present invention is shown in FIG. 4, wherein the lens body is formed by injection molding of a PC material, and the lens body is formed by a single injection molding. with The secondary type consisting of the two sides of the inner core; the secondary type of injection plastic fully fills the suction and depression of the inner core surface during the cooling process of the primary core, forming the optical performance of the headlight lens The required light-incident surface and the light-emitting surface; the secondary-type injection heat is completely fused with the primary condensation layer outer surface 1011 and the condensation layer inner surface 1031 formed during the secondary injection molding to form an integrated lens body without delamination.

In a preferred embodiment of the automotive headlamp lens manufactured by the enclosure type injection molding method of the present invention, the total thickness H0 of the lens body is 25 to 32 mm, and the wall thickness H2 of the secondary pattern 103 is 3 to 6mm.

The comparison results of the technical effects of the thick layer plastic part using the surrounding layered injection molding method of the present invention and the existing single layer injection molding method are shown in the following table:

It should be understood by those skilled in the art that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Any of the above embodiments are based on the spirit of the present invention. Variations and modifications of the invention are intended to fall within the scope of the appended claims.

Claims

A thick-walled plastic-enclosed layered injection molding method for realizing layered injection molding of thick-walled plastic parts by using a common rotary mold on a general rotary type injection molding machine, characterized in that:

Configuring an intermediate plate for performing a function of a transfer core between a fixed template of the turntable mold and the movable template;

The thick-walled plastic-enclosed layered injection molding method includes the following injection molding operation steps:

S10: rotating the intermediate plate to rotate the intermediate cavity in the cavity state to the first station, clamping between the fixed template I cavity and the movable template I cavity, and clamping the mold to form the product primary molding cavity;

S20: opening the injection valve of the first station to perform one-shot injection molding of the product, and the primary type formed by injection molding is left on the intermediate cavity to form an intermediate plate carrying the product primary type;

S30: performing mold opening and picking operation after the temperature reaches the mold opening temperature, and discharging the finished product of the secondary injection molding in the previous injection molding cycle from the intermediate cavity;

S40: rotating the intermediate plate to perform the core-turning operation, and clamping the mold after the core is in position: the intermediate cavity in the cavity state after the taking operation is turned to the first station, and is clamped in the fixed template I cavity and the movable template I cavity. Between, after re-closing, the product is formed into a molding cavity; at the same time, the intermediate plate carrying the product primary type is rotated to the second station, clamped between the fixed template II cavity and the movable template II cavity, and clamped again. After forming a secondary molding cavity surrounded by the primary sides of the product;

S50: opening the injection valve of the second station to perform secondary injection molding of the product, and simultaneously injecting the high temperature injection plastic into the two sides of the intermediate plate carrying the product primary type to form a secondary type of the surrounding structure;

If all the injection molding operations are completed, the process proceeds to step S60, otherwise, the process returns to step S20, and the surrounding layered injection molding continuous operation is repeated cyclically;

S60: After the temperature reaches the mold opening temperature, the mold opening and taking operation is performed, and the finished product of the secondary injection molding is ejected from the intermediate cavity.
The method according to claim 1, wherein the mold opening temperature is set to a glass transition temperature of the PC injection molding material.
A thick-walled plastic-enclosed layered injection molding method according to claim 1, characterized by a secondary injection molding die The high mold temperature is used to ensure the smooth filling of the injection plastic, and the suction depressions appearing on both sides of the primary type can be simultaneously supplemented.
The method for enclosing a layered injection molding of a thick-walled plastic part according to claim 1, wherein the temperature of the injection molding plastic is such that the secondary type of injection heat can heat and melt the outer surface of the primary condensation layer into a molten state, thereby avoiding occurrence of Product deficiencies.
A rotary mold core mold structure for the thick-walled plastic-enclosed layered injection molding method according to claim 1, which is used for an injection mold of a general rotary rotary injection molding machine, including a first station for performing primary injection molding and execution a second station for secondary injection molding; characterized in that: a rotatable intermediate plate is arranged between the fixed template and the movable plate of the rotary die, and the product formed by injection molding at the first station is rotated by the rotating intermediate plate. a second station for implementing a mold core function of the injection mold; the set template includes at least one pair of fixed template I cavity and fixed template II cavity; and the movable template includes at least one pair of movable template I matched with the fixed template The cavity and the movable template II cavity; the intermediate plate comprises an intermediate cavity corresponding to the fixed template and the movable template cavity, and the intermediate cavity in the cavity state is sandwiched between the fixed template I cavity and the movable template I cavity, and the clamping is formed The primary molding cavity of the product; the intermediate plate carrying the product primary type formed after the primary injection molding is sandwiched between the fixed template II cavity and the movable template II cavity, and the clamping mode constitutes a quadratic type surrounding the primary side of the product. Molding cavity.
The mold core mold structure according to claim 5, wherein the fixed template comprises two fixed template I cavities at the first station, and two fixed template II cavities at the second station; The movable template includes two movable template I cavities paired with the fixed template I cavity, and two movable template II cavities paired with the fixed template II cavity; the intermediate plate includes four intermediate cavities, and the intermediate plate is rotated The four intermediate cavities rotate between the first station and the second station; the intermediate plate is sandwiched between the fixed template and the movable template, and the clamping mold forms two sets of one-time forming cavities and two sets of two Secondary molding cavity.
The mold core mold structure according to claim 5, wherein said intermediate plate adopts a separate structure having only one intermediate cavity on each intermediate plate; corresponding to each of the double or four cavity injection molds The molding cavity is separately provided with a separate intermediate plate.
The rotary mold core mold structure according to claim 5, wherein the primary type and the secondary type of the product adopt an unequal wall thickness design, and the wall thickness of the secondary type satisfies the thinning treatment of the secondary type molding cavity The requirements can ensure that the secondary condensation condensation of the product is uniform and the shape is filled satisfactorily, meeting the optical performance requirements of the headlamp lens; The thickness of the primary type depends on the total thickness of the injection molded product and the wall thickness of the secondary type.
An automotive headlamp light illuminator manufactured by the method of enveloping layer-by-layer injection molding of the thick-walled plastic part according to claim 1, wherein the lens body is formed by injection molding of a PC material, wherein the lens body is molded by a single injection molding. The inner core and the secondary type surrounding the inner core are formed; the secondary type injection plastic is fully filled with the suction sag which appears on both sides of the inner core during the cooling process of the inner core, and is formed to meet the headlights. The optical surface of the light mirror requires the light-incident surface and the light-emitting surface; the secondary type of injection heat fuses the outer surface of the primary condensation layer completely with the inner surface of the condensation layer formed during the secondary injection molding to form a non-layered integrated lens. main body.
The automotive headlamp light distribution lens according to claim 9, wherein said lens main body has a total thickness of 25 to 32 mm, and said secondary type has a wall thickness of 3 to 6 mm.