CN106273272A - Core two-step exchanges double-shot moulding mould and forming method - Google Patents

Abstract

The invention provides a two-color injection mold with interchangeable cores and two processes and a molding method, including a fixed template, a cavity fixed plate, a core fixed plate, a movable template and a supporting plate arranged on one side, and the fixed template and the cavity are fixed There are outer wall cavity inserts between the plates, and at least one pair of longitudinally arranged cores are set on the core fixing plate, and the corresponding positions of the fixed template and the two cores have concave cavities of different shapes to form inner lining cavities and The product cavity, the pallet is provided with an ejection mechanism for driving the product out, and the cavity fixing plate is connected with a rotating mechanism. When the product is ejected, the rotating mechanism drives the cavity fixing plate to rotate 180° to realize the up and down shape. Exchange of core positions. The invention has a simple structure, can simultaneously complete two-step injection molding processes in the same pair of molds, realizes two-color injection molding according to different injection molding materials, and greatly improves work efficiency.

Description

Core Two-Process Interchange Two-color Injection Mold and Forming Method

technical field

The invention relates to a two-color injection mold with interchangeable two-process cores and a molding method.

Background technique

As shown in Figures 1 and 2, they are pictures of products to be formed. In order to realize two-color injection molding, the color-separated injection molding of the inner liner 101 and the outer shell 102 must be completed in Figure 1. The injection mold used in the traditional molding method is relatively Complicated, it is necessary to replace the template to achieve two-color injection molding, which is less efficient.

Contents of the invention

The present invention improves the above problems, that is, the technical problem to be solved by the present invention is that the existing two-color injection molding structure is relatively complicated and the efficiency is low.

The specific embodiment of the present invention is: a two-process interchangeable two-color injection mold for the core, including a fixed platen, a cavity fixed plate, a core fixed plate, a movable platen and a supporting plate arranged on one side. There are outer wall cavity inserts between the cavity fixing plates, and at least one pair of longitudinally arranged cores are arranged on the core fixing plate, and the corresponding positions of the fixed plate and the two cores have concave cavities of different shapes to form the lining type. Cavity and product cavity, the supporting plate is provided with an ejection mechanism for driving the product to eject, the cavity fixing plate is connected with a rotating mechanism, when the product is ejected, the rotating mechanism drives the cavity fixing plate to rotate 180° to achieve Exchange of upper and lower core positions.

Further, the ejector mechanism includes a ejector rod arranged in the movable template, and the outer end of the ejector rod passes through the middle part of the core and faces the inner lining cavity or the product cavity correspondingly, and the inner lining cavity and the product cavity are both arranged correspondingly. There is a ejector rod, and the ejector rod is provided with a ejector rod return spring. One end of the ejector rod return spring acts on the ejector rod and the other end acts on the core. The ejector driving mechanism that moves one side of the product cavity.

Further, an outer wall cavity plate is provided on the outside of the product cavity, and a lifter pin is arranged inside the fixed template, one end of the lifter pin acts on the outer wall cavity plate, and the other end is fixed to the fixed template by a lifter spring In order to realize product cavity type.

Further, there is a limit sleeve between the fixed template and the cavity fixing plate, and a limit rod is arranged in the limit sleeve, and one end of the limit rod is fixed on the cavity fixing plate, and the limit sleeve is provided with a limit rod. The table top matched with the end of the rod, when the end of the stop rod is in contact with the table top, the stop rod is driven to realize the separation of the core fixing plate and the cavity fixing plate.

Further, the rear side of the supporting plate is provided with a movable mold seat plate, and the rotating mechanism includes a rotating rod with one end fixedly connected to the cavity fixing plate, and a gear is provided at one end of the rotating rod at the movable mold seat plate. The gear is matched with a toothed rack driven by the air cylinder to realize the rotation of the rotating rod.

Further, the push rod driving mechanism is a piston push rod driven by an air cylinder.

Further, the fixed template is provided with a sprue sleeve, and a sprue spring is provided on the outer side of the sprue sleeve, and one end of the sprue spring acts on the fixed template and the other end acts on the front end of the sprue sleeve. The inner and rear side of the sprue sleeve is provided with a spring ejector rod for realizing ejection of the sprue.

Further, a steel ball seat is provided at the end of the movable formwork facing the supporting plate, a steel ball is arranged in the steel ball seat, a groove is provided on the supporting plate to cooperate with the steel ball, and a steel ball seat is fixed on the rear side of the steel ball seat. A positioning spring in the template, one end of the positioning spring acts on the steel ball seat at the other end of the movable template.

Further, the fixed platen, the cavity fixed plate, the core fixed plate, and the movable platen are provided with through guide posts.

The present invention also includes a two-color injection molding method with two-process interchangeable cores, including a two-color injection mold with two-process interchangeable cores as claimed in claim 7, characterized in that it includes the following steps:

(1) When starting injection molding, the longitudinal injection seat of the injection molding machine moves forward and presses down the sprue sleeve. At this time, there is a formed inner lining in the product cavity. After the outer wall of the product is injected, the injection seat moves back, and the sprue sleeve springs off. The main runner and the horizontal injection seat are injected into the lining cavity to form the lining, and then retreat;

(2) The mold is opened, and under the action of the ejector pin spring, the ejector pin is divided along the parting surface of the product cavity. When the product lining cavity is in parting, the latent gate is cut off by the spring ejector rod and pushed out , the product that has completed the outer wall molding is separated from the fixed template;

(3) With the separation of the fixed template and the cavity fixing plate in the mold opening, the limit rod is also separated. When the limit rod is about to touch the bottom of the limit sleeve, the mold opening action is suspended. At this time, the mold opening distance is exactly In line with the demoulding space of the product and the runner, the ejector mechanism works, and the piston ejector rod corresponding to the product cavity pushes the horizontal ejector rod to overcome the ejector rod return spring 4 to move. under the action of reset.

(4) After the product is ejected, the mold continues to open, the limit sleeve and the limit rod drive the cavity fixing plate to move, the cavity fixing plate and the core fixing plate are separated, when the core retreats to the cavity fixing plate When it is down, the rotating mechanism works, the cylinder pushes the rack, drives the core fixing plate to rotate 180° through the rotating rod, and completes the exchange of the two process positions of the core, and the core 220 filled with product lining is transferred to the product cavity station In the middle, the mold can be clamped for the next cycle of production.

Compared with the prior art, the present invention has the following beneficial effects: the present invention has a simple structure, and the two-step injection molding process can be simultaneously completed in the same pair of molds by using the cooperation of the limiting mechanism, the rotating mechanism and the ejecting mechanism. Realize two-color injection molding, which greatly improves work efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the product of the present invention.

Fig. 2 is a schematic diagram of the structure of the product of the present invention.

Fig. 3 is a schematic diagram of the top view layout structure of the injection mold of the present invention.

Fig. 4 is a schematic cross-sectional view of A-A in Fig. 3 of the present invention.

Fig. 5 is a schematic cross-sectional view of B-B in Fig. 3 of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 5, the core two-process interchangeable two-color injection mold in this embodiment includes a fixed plate 10, a cavity fixed plate 20, a core fixed plate 30, a movable plate 40, and a supporting plate. 50 and movable mold seat plate 60.

In this embodiment, an outer wall cavity insert 210 is arranged between the fixed template 10 and the cavity fixing plate 20, and two pairs of longitudinally arranged cores 220 are arranged on the core fixing plate 20, and the outer wall cavity insert 210 and the mold cavity A mold cavity is formed between the core 220 and the fixed plate 10. In this embodiment, the perspective of FIG. The cavity is used to form the lining part 101, which is the cavity of the lining.

The supporting plate is provided with an ejection mechanism for driving the ejection of the product, and the cavity fixing plate is connected with a rotating mechanism. When the product is ejected, the rotating mechanism drives the cavity fixing plate to rotate 180° to realize the exchange of the positions of the upper and lower cores .

In this embodiment, the fixed formwork 10 adopts a latent gate, and a gate spring 111 is set on the outer side of the sprue sleeve 110. One end of the gate spring acts on the fixed formwork and the other end acts on the front end of the sprue sleeve. The sprue bushing 110 is provided with a spring ejector rod 112 on the inner rear side for realizing sprue ejection.

The outer side of the product cavity is provided with an outer wall cavity plate 310, and the fixed template 10 is provided with a lifter pin 120, one end of the lifter pin 120 acts on the outer wall cavity plate 310, and the other end is fixed by a lifter spring 121 In the fixed template 10 to realize product cavity type.

Between the fixed template 10 and the cavity fixing plate 20, there is a limit sleeve 130, and a limit rod 131 is arranged in the limit sleeve 130, and one end of the limit rod 131 is fixed on the cavity fixed plate 20, and the limit sleeve is set There is a table top matched with the end of the limiting rod, and when the end of the limiting rod is in contact with the table, the limiting rod is driven to separate the core fixing plate 30 from the cavity fixing plate 20 .

The ejector mechanism includes a ejector pin 410 arranged in the movable template 40, and the outer end of the ejector pin 410 passes through the middle part of the core 220 and faces to the inner lining cavity or the product cavity, and the inner lining cavity and the product cavity Correspondingly, ejector rods are provided, and the ejector rod 410 is provided with an ejector rod return spring 411. One end of the ejector rod return spring 411 acts on the ejector rod and the other end acts on the core, and is located on the supporting plate on one side of the product cavity. There is an ejector driving mechanism that drives the ejector to move to the side of the product cavity.

In this embodiment, in order to realize simultaneous ejection of the products in the two upper cavities, the horizontally adjacent ejector rods 410 in this embodiment are connected by a bridge plate 412, and the ejector rod driving mechanism is a piston driven by an air cylinder. The push rod 413, the piston push rod 413 acts on the bridge plate 412 so that the bridge plate 412 is used to synchronously push the two push rods 410 to move laterally.

In this embodiment, the rotating mechanism includes a rotating rod 70 with one end fixedly connected to the cavity fixing plate. The rotating rod 70 is provided with a gear 710 at one end of the movable mold seat plate 60. The gear 710 is matched with a cylinder 721 The driven rack 720 is used to realize the rotation of the rotating rod.

In order to better realize the positioning when the mold rotates, the movable template 40 is provided with a steel ball seat 420 towards the end of the supporting plate, the steel ball seat 420 is provided with a steel ball 421, and the supporting plate 50 is provided with a steel ball 421 The matching groove 422 and the rear side of the steel ball seat are provided with a positioning spring 423 fixed in the movable template. One end of the positioning spring 423 acts on the movable template 40 and the other end acts on the steel ball seat 420 .

In addition, the fixed platen, cavity fixed plate, core fixed plate, and movable platen are provided with through guide pillars 114 to facilitate guidance.

The working steps are as follows,

(1) When starting injection molding, the longitudinal injection seat of the injection molding machine moves forward and presses down the sprue sleeve 110. At this time, there is a formed lining in the product cavity, and there is no injection molding in the lining cavity. After the outer wall of the product is injection molded, inject When the seat retreats, the sprue sleeve rebounds and breaks away from the main runner, and the horizontal injection seat is injected into the lining cavity to form the lining part 101, and then also retreats.

(2) The mold is opened. Under the action of the ejector pin 120 and the ejector pin spring 121, the mold is divided along the I-I parting surface in Figure 4. When the product lining cavity is in the mold parting position, the latent gate is pushed by the spring. The material rod 112 is cut off and pushed out, and the product that has completed the outer wall molding is separated from the fixed plate.

(3) With the separation of the fixed template 10 and the cavity fixing plate 20 during the mold opening, the limit rod 131 is also separated. When the limit rod 131 is about to touch the bottom of the limit sleeve 130, the mold opening action is suspended. When the mold opening distance is just in line with the demoulding space of the product and the runner, the ejector mechanism works, and the piston ejector rod 413 corresponding to the product cavity acts on the bridge plate 412, so that the bridge plate 412 synchronously pushes the two ejector rods 410 in the horizontal direction to overcome the ejector. The rod return spring 411 moves, and the piston push rod 413 returns immediately after the product is ejected, and the bridge plate 412 and the push rod 410 reset under the action of the spring.

(4) After the product is ejected, the mold continues to open, the limit sleeve 130 and the limit rod 131 drive the cavity fixing plate 20 to move, and the II-II parting surface is divided. When the core 220 retreats to the cavity fixing plate 20 When it is down, the rotating mechanism works, and the cylinder 721 pushes the rack 720, and drives the core fixing plate 20 to rotate 180° through the 70 rotating rod, and completes the exchange of the two working positions of the core 220, and the core 220 marked with the product liner turns to In the product cavity station, the mold can be closed for the next cycle of production.

(5) When the core fixing plate 20 rotates next time, the air cylinder 721 works and pulls the rack 720 to exchange back and forth, so as to accurately realize the swing of the core fixing plate 20 .

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (10)

1. A two-color injection mold with interchangeable cores in two processes, characterized in that it comprises a fixed template, a cavity fixed plate, a core fixed plate, a movable template and a supporting plate provided on one side, and the fixed template and the cavity are fixed There are outer wall cavity inserts between the plates, and at least one pair of longitudinally arranged cores are set on the core fixing plate, and the corresponding positions of the fixed template and the two cores have concave cavities of different shapes to form inner lining cavities and The product cavity, the pallet is provided with an ejection mechanism for driving the product out, and the cavity fixing plate is connected with a rotating mechanism. When the product is ejected, the rotating mechanism drives the cavity fixing plate to rotate 180° to realize the up and down shape. Exchange of core positions. 2. A two-color injection mold with interchangeable two-process cores according to claim 1, characterized in that the ejector mechanism includes ejector rods arranged in the movable template, and the ejector rods pass through the middle of the core and the outer ends correspond to Facing the inner liner cavity or the product cavity, the inner liner cavity and the product cavity are respectively provided with ejector rods, and the ejector rod is provided with a ejector rod return spring, and one end of the ejector rod return spring acts on the other end of the ejector rod. One end acts on the core, and the supporting plate on one side of the product cavity is provided with a driving mechanism for driving the ejector to move to the side of the product cavity. 3. A two-process interchangeable two-color injection mold for cores according to claim 2, characterized in that an outer wall cavity plate is provided on the outside of the product cavity, and ejector pins are provided in the fixed template, so that One end of the ejector pin acts on the outer wall cavity plate, and the other end is fixed in the fixed template by the ejector pin spring to realize the product cavity type. 4. A kind of core two-process interchangeable two-color injection mold according to claim 3, characterized in that, there is a limit sleeve between the fixed template and the cavity fixed plate, and a limit rod is arranged in the limit sleeve, and the One end of the limit rod is fixed on the cavity fixing plate, and the limit sleeve is provided with a table that matches with the end of the limit rod. The fixed plate is detached. 5. A two-color injection mold with interchangeable cores and two processes according to any one of claims 4, characterized in that a movable mold base plate is provided on the rear side of the supporting plate, and the rotating mechanism includes a fixed connection at one end The rotating rod on the cavity fixing plate is provided with a gear at one end of the movable mold seat plate, and the gear is matched with a rack driven by a cylinder to realize the rotation of the rotating rod. 6 . The two-color injection mold with interchangeable cores and two processes according to claim 5 , wherein the ejector rod driving mechanism is a piston ejector rod driven by an air cylinder. 7 . 7. A two-color injection mold with interchangeable cores and two processes according to claim 6, characterized in that a sprue sleeve is provided on the fixed plate, and a sprue spring is provided on the outside of the sprue sleeve, so that One end of the sprue spring acts on the fixed template and the other end acts on the front end of the sprue sleeve, and the inner and rear sides of the sprue sleeve are provided with a spring ejector rod for realizing gate ejection. 8. A two-color injection mold with interchangeable cores and two processes according to claims 1 to 7, characterized in that a steel ball seat is provided at the end of the movable template facing the supporting plate, and steel balls are provided in the steel ball seat , the supporting plate is provided with a groove for matching with the steel ball, and the rear side of the steel ball seat is provided with a positioning spring fixed in the movable template, and one end of the positioning spring acts on the steel ball seat at the other end of the movable template. 9 . The two-color injection mold with interchangeable cores and two processes according to claim 2 , characterized in that there are guide pillars penetrating inside the fixed platen, the cavity fixed plate, the core fixed plate and the movable platen. 10 . 10. A two-color injection molding method with two-process interchangeable core, characterized in that it comprises a two-color injection mold with two-process interchangeable core as claimed in claim 7, characterized in that it comprises the following steps: (1) When starting injection molding, the longitudinal injection seat of the injection molding machine moves forward and presses down the sprue sleeve. At this time, there is a formed inner lining in the product cavity. After the outer wall of the product is injected, the injection seat moves back, and the sprue sleeve springs off. The main runner and the horizontal injection seat are injected into the lining cavity to form the lining, and then retreat; (2) The mold is opened, and under the action of the ejector pin spring, the ejector pin is divided along the parting surface of the product cavity. When the product lining cavity is in parting, the latent gate is cut off by the spring ejector rod and pushed out , the product that has completed the outer wall molding is separated from the fixed template; (3) With the separation of the fixed template and the cavity fixing plate in the mold opening, the limit rod is also separated. When the limit rod is about to touch the bottom of the limit sleeve, the mold opening action is suspended. At this time, the mold opening distance is exactly In line with the demoulding space of the product and the runner, the ejector mechanism works, and the piston ejector rod corresponding to the product cavity pushes the horizontal ejector rod to overcome the ejector rod return spring 4 to move. under the action of reset; (4) After the product is ejected, the mold continues to open, the limit sleeve and the limit rod drive the cavity fixing plate to move, the cavity fixing plate and the core fixing plate are separated, when the core retreats to the cavity fixing plate When it is down, the rotating mechanism works, the cylinder pushes the rack, drives the core fixing plate to rotate 180° through the rotating rod, and completes the exchange of the two process positions of the core, and the core 220 filled with product lining is transferred to the product cavity station In the middle, the mold can be closed for the next cycle of production.