CN115230070A

CN115230070A - Double-color mold and processing technology thereof

Info

Publication number: CN115230070A
Application number: CN202210944748.1A
Authority: CN
Inventors: 刘建波; 兰凯
Original assignee: Shenzhen Xiongxing Industry Co ltd
Current assignee: Shenzhen Xiongxing Industry Co ltd
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-10-25

Abstract

The application relates to the technical field of double-shot molding, and discloses a double-shot mold and a processing technology thereof, the double-shot mold is characterized in that: the mold core forming part is fixedly connected with a first exhaust valve, the first exhaust valve comprises a first sliding groove, a first valve core and a first elastic piece, the first valve core is connected with the first sliding groove in a sliding mode, one end of the first elastic piece is fixedly connected to the bottom of the first sliding groove, the other end of the first elastic piece is fixedly connected to the first valve core, an opening of the first sliding groove is formed in the surface of the mold core forming part, the movable mold plate is provided with a first exhaust passage, one end of the first exhaust passage is communicated with the first sliding groove, the other end of the first exhaust passage is communicated with the outside, and when the first elastic piece is not subjected to external force, the first exhaust passage is blocked by the first valve core; this application helps improving double-colored mould's exhaust effect.

Description

Double-color mold and processing technology thereof

Technical Field

The application relates to the technical field of double-color injection molding, in particular to a double-color mold and a processing technology thereof.

Background

At present, the injection molding process has the characteristics of low cost, high production efficiency and high automation degree, and is widely applied to the production of non-metallic structural parts; in order to improve the aesthetic property and the assembly performance of products, more and more injection molded parts are produced in a double-shot injection molding mode, wherein the double-shot injection molding refers to the injection molding of two different materials to the same set of mold, so that the injection molding process of the injection molded parts formed by the two materials is realized.

Two-color injection molding manufacturers often adopt core-rotating two-color injection molding equipment to produce two-color injection molded parts, the existing two-color mold comprises a fixed mold 1 and a movable mold 2, the movable mold 2 comprises a movable mold base 21 and a movable mold plate 22, the movable mold plate 22 is rotatably connected to the movable mold base 21, one surface of the movable mold plate 22 close to the fixed mold 1 is provided with two core molding parts 221 which are symmetrical with the center of a rotating axis of the movable mold plate 22, one surface of the fixed mold 1 close to the movable mold 2 is provided with a first mold cavity 101 and a second mold cavity 102 which are used for being matched with the two core molding parts 221 to form a first mold cavity and a second mold cavity, and the two-color mold further comprises a rotating mold driving component 3 which is used for controlling the movable mold plate 22 to rotate; the two-color injection molding includes a first injection molding and a second injection molding, wherein the first injection molding forms a first molded body 100 in a first molded cavity, and the second injection molding forms a second molded body 200 in a second molded cavity.

However, after the two-color mold is closed, the molding cavity formed between the movable mold plate 22 and the fixed mold 1 contains air, when injection molding is performed, the air in the molding cavity can obstruct the mold filling process of molten plastic, and after the air is compressed, the air pressure and the temperature can be increased, so that the mold filling speed is slow, the quality problem of an injection molding piece caused by air impact or air permeation into the injection molding piece can be caused, and the injection molding piece is heated, decomposed or even carbonized, and the like; the existing double-color mold is usually exhausted by adopting a mode of arranging an exhaust hole and an exhaust groove.

Therefore, in view of the above-described related art, the inventors have considered that the existing two-color mold vent structure has a problem of being easily clogged with molten plastic.

Disclosure of Invention

In order to improve the exhaust effect of the double-color mold, the application provides the double-color mold and a machining process thereof.

The first purpose of the invention of the application is realized by adopting the following technical scheme:

a double-color mold comprises a fixed mold, a movable mold and a rotating mold driving assembly, wherein the movable mold comprises a movable mold frame and a movable mold plate, the movable mold plate is rotatably connected to the movable mold frame, two mold core forming parts which are centrosymmetric with a rotation axis of the movable mold plate are arranged on one surface of the movable mold plate close to the fixed mold, a first mold cavity and a second mold cavity which are matched with the two mold core forming parts to form a first mold cavity and a second mold cavity are arranged on one surface of the fixed mold close to the movable mold, and the movable mold plate is fixedly connected to the rotating mold driving assembly which is used for controlling the movable mold plate to rotate; the core shaping portion fixedly connected with first exhaust valve, first exhaust valve includes first spout, first case and first elastic component, first case sliding connection is in first spout, the one end fixed connection of first elastic component is in the bottom of first spout, other end fixed connection is in first case, the opening of first spout sets up in the surface of core shaping portion, the movable mould board is provided with first exhaust way, the one end of first exhaust way communicates in first spout, and the other end communicates with the external world, works as when first elastic component does not receive external force, first case shutoff first exhaust way.

By adopting the technical scheme, the mold core forming part is fixedly connected with the first exhaust valve, the first exhaust valve comprises a first chute, a first valve core and a first elastic piece, wherein an opening of the first chute is arranged on the surface of the mold core forming part, the movable mold plate is provided with a first exhaust passage, one end of the first exhaust passage is communicated with the first chute, and the other end of the first exhaust passage is communicated with the outside to be used as a passage for exhausting gas in the forming cavity; the first valve core is connected with the first sliding groove in a sliding mode, two ends of the first elastic piece are fixedly connected to the bottom of the first sliding groove and the first valve core respectively, and when the first elastic piece is not subjected to external force, the first valve core blocks the first exhaust channel; because the gas in the extrusion molding cavity can be formed when the molten plastic is filled in the molding cavity, the volume of the gas is compressed and the gas pressure is increased, the pressure generated by the gas to the first valve core is utilized to push away the first valve core and the gas is discharged from the first gas discharge passage, and when the pressure generated by the gas discharged to the residual gas is not enough to push away the first valve core, the first valve core is reset and blocks the first gas discharge passage again, so that the possibility that the molten plastic flows into the first gas discharge passage to block the first gas discharge passage is reduced.

Preferably: the bottom of the first sliding groove is provided with an electromagnet used for attracting the first valve core, the movable template is provided with an air exhaust flow passage, one end of the air exhaust flow passage is communicated with the first sliding groove, the other end of the air exhaust flow passage is communicated with the outside, an air pump is arranged in the air exhaust flow passage, and the opening of the first air exhaust passage on the side wall of the first sliding groove is closer to the bottom of the first sliding groove than the opening of the air exhaust flow passage on the side wall of the first sliding groove.

By adopting the technical scheme, when the double-color mold with the rotary mold core is used for double-color injection, the first molded body needs to be rotated to the position right opposite to the second molded cavity, so that secondary mold closing is convenient to be carried out to form the second molded cavity, and when the movable mold plate rotates, the problem that the first molded body is loosened and even falls off from the movable mold plate is easy to occur, so that the problem that the second molded body formed by secondary injection is poor in quality and even cannot be subjected to secondary injection is caused; the electromagnet for attracting the first valve core is arranged at the bottom of the first sliding groove, so that the function of actively controlling the movement of the first valve core is realized through the electromagnet; the movable template is provided with an air exhaust flow passage, one end of the air exhaust flow passage is communicated with the first sliding groove, the other end of the air exhaust flow passage is communicated with the outside, and an air pump is arranged in the air exhaust flow passage, so that air in a space between the first sliding groove and the first molded body can be conveniently exhausted through the air pump to form negative pressure, the function of sucking the first molded body is further achieved, the possibility of loosening and even falling between the first molded body and the movable template is reduced, and the finished product fraction defective of the double-color injection molded part is reduced; on the other hand, the opening of the first exhaust passage on the side wall of the first sliding groove is closer to the bottom of the first sliding groove relative to the opening of the air exhaust flow passage on the side wall of the first sliding groove, so that the first valve core is controlled to seal the first exhaust passage while the air exhaust flow passage is opened, the possibility that the outside air enters the space between the first sliding groove and the first molded body from the first exhaust passage when the air pump exhausts air is reduced, and the suction effect on the first molded body is improved.

Preferably: the movable template is provided with an air exhaust flow passage, one end of the air exhaust flow passage is communicated with the first sliding groove, the other end of the air exhaust flow passage is communicated with the outside, an air pump is arranged in the blowing flow passage, and the opening of the first air exhaust passage on the side wall of the first sliding groove is closer to the bottom of the first sliding groove relative to the opening of the blowing flow passage on the side wall of the first sliding groove.

By adopting the technical scheme, after the finished injection molding part is finished, the push rod is generally required to push the finished injection molding part to separate the finished injection molding part from the movable template, and the surface of the finished injection molding part is easy to scratch when the push rod is used for pushing the finished injection molding part; the movable template is provided with an air exhaust flow passage, one end of the air exhaust flow passage is communicated with the first sliding groove, the other end of the air exhaust flow passage is communicated with the outside, and an air pump is arranged in the air exhaust flow passage, so that air can be conveniently blown into a space between the first sliding groove and the first molded body through the air pump, the function of pushing a finished injection molding piece to be separated from the movable template through the blown air is further achieved, the possibility of surface scratching in the demolding process of the finished injection molding piece is reduced, meanwhile, a push rod and a driving piece for driving the push rod are not needed, the structure of the double-color injection molding equipment is simplified, and therefore the equipment cost, the maintenance cost and the failure rate are reduced; on the other hand, the opening of the first exhaust passage on the side wall of the first sliding groove is closer to the bottom of the first sliding groove relative to the opening of the blowing passage on the side wall of the first sliding groove, so that the first valve core is controlled to open the blowing passage and simultaneously block the first exhaust passage, the possibility that the blown gas leaks from the first exhaust passage when the gas is blown by the gas pump is reduced, and the blowing and demolding effects on finished injection molding parts are improved.

Preferably, the following components: the mold core forming part is fixedly connected with a second exhaust valve, the second exhaust valve comprises a second sliding groove, a second valve core and a second elastic part, the second valve core is connected to the second sliding groove in a sliding mode, one end of the second elastic part is fixedly connected to the bottom of the second sliding groove, the other end of the second elastic part is fixedly connected to the second valve core, an opening of the second sliding groove is formed in the surface of the mold core forming part, a second exhaust passage is formed in the movable mold plate, one end of the second exhaust passage is communicated with the side wall of the first sliding groove, the other end of the second exhaust passage is communicated with the outside, when the second elastic part is not subjected to external force, the second exhaust passage is sealed by the second valve core, the first sliding groove is communicated with the first forming cavity, and the second sliding groove is communicated with the second forming cavity.

By adopting the technical scheme, because the first molded body is formed in the first molded cavity by one-time injection molding and the second molded body is formed in the second molded cavity by two-time injection molding, in order to further improve the exhaust effect of the two-color mold, the exhaust of the gas in the first molded cavity and the gas in the second molded cavity are required; therefore, the core forming part further comprises a second exhaust valve, wherein the first sliding chute of the first exhaust valve is communicated with the first forming cavity, and the second sliding chute of the second exhaust valve is communicated with the second forming cavity, so as to be respectively used for exhausting the gas of the first forming cavity and the gas of the second forming cavity.

Preferably: the movable template is provided with a bidirectional flow channel, one end of the bidirectional flow channel is communicated with the first chute, the other end of the bidirectional flow channel is communicated with the outside, the bidirectional flow channel comprises an airflow intersection point I, an airflow intersection point A, an airflow intersection point B and an airflow intersection point O, a flow channel section IA, a flow channel section AB, a flow channel section BO, a flow channel section IB and a flow channel section AO, the flow channel section IA, the flow channel section BO, the flow channel section AO and the flow channel section IB are respectively provided with a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve which are used for controlling the on-off of the corresponding flow channel sections, the air suction flow channel comprises a flow channel section IA, a flow channel section AB and a flow channel section BO, the air blowing flow channel comprises a flow channel section AB, a flow channel section IB and a flow channel section AO, the flow channel section AB is provided with an air pump used for pumping air from the airflow intersection point A to the airflow intersection point B, the airflow intersection point I is communicated with the first chute, and the airflow intersection point O is communicated with the outside.

By adopting the technical scheme, the bidirectional flow channel comprises the air exhaust flow channel and the air blowing flow channel, when the first electromagnetic valve and the second electromagnetic valve are in an opening state, the air exhaust flow channel is communicated, and when the air pump works, the air in the space between the first molded body and the first sliding groove is driven to be exhausted to the external environment through the air exhaust flow channel, so that the function of sucking the first molded body is realized; when the third electromagnetic valve and the fourth electromagnetic valve are in an opening state, the air blowing channels are communicated, and when the air pump works, air in the external environment is pumped into a space between the first molded body and the first sliding groove through the air blowing channels, so that the function of air blowing and demolding of a finished injection molded part is realized.

Preferably: one side fixedly connected with that the movable mould frame is close to the stationary mould is used for being closed when the compound die is moulded plastics to auto-lock travel switch that the stationary mould touched, auto-lock travel switch is closed when the compound die is once moulded plastics, the air pump electricity is connected with the first control circuit that is used for controlling the function start of bleeding, first control circuit includes:

the air pumping function starting module is used for detecting the on-off condition of the self-locking travel switch so as to send an air pumping function starting signal when the self-locking travel switch is detected to be closed;

the first switch module is electrically connected to the air pumping function starting module and is used for sending a first switch signal when receiving the air pumping function starting signal;

and the first execution module is electrically connected with the first switch module and is connected in series in a power supply loop of the air pump, the electromagnet, the first electromagnetic valve and the second electromagnetic valve so as to send a first execution signal to control the starting of the air pumping function after a period of time delay when receiving the first switch signal.

By adopting the technical scheme, when the air pumping function starting module detects that the self-locking travel switch is triggered and closed, namely, when one-time injection mold closing is carried out, the self-locking travel switch is closed, the air pumping function starting module sends an air pumping function starting signal, the first switch module sends a first switch signal after receiving the air pumping function starting signal, the first execution module sends a first execution signal after receiving the first switch signal and delays for a period of time to control the air pumping function to be started, so that after one-time injection mold closing, the first molding body is waited to complete injection molding through delaying, and the air pumping function is started after the first molding body completes injection molding to attract the first molding body, so that the possibility that the first molding body is loosened and even falls off from the driven mold plate is reduced in the process of rotating the first molding body to a position right opposite to the second molding cavity; when the secondary injection molding die is closed, the self-locking travel switch is triggered to be disconnected again, the air exhaust function starting module stops sending an air exhaust function starting signal, and then the air exhaust function is closed, so that the influence on the finished product demolding of the double-color injection molding piece after the secondary injection molding is finished is prevented.

Preferably: one side of the movable mould plate close to the fixed mould is fixedly connected with a follow-up travel switch used for being touched by the fixed mould when the mould is closed, one side of the top mould close to the movable mould plate is provided with a avoiding groove capable of containing the follow-up travel switch, the quantity of the avoiding grooves is equal to that of the follow-up travel switches, the air pump is electrically connected with a second control circuit used for controlling the starting of an air blowing function, and the second control circuit comprises:

the blowing function starting module is used for detecting the on-off condition of the follow-up travel switch so as to send a blowing function starting signal when the follow-up travel switch is detected to be closed;

the second switch module is electrically connected with the blowing function starting module to send out a second switch signal when receiving the blowing function starting signal;

the second execution module is electrically connected to the second switch module and used for sending out a second execution signal when receiving the second switch signal;

and the third execution module is electrically connected with the second execution module and is connected in series in a power supply loop of the air pump, the electromagnet, the third electromagnetic valve and the fourth electromagnetic valve so as to send a third execution signal to control the start of the blowing function when receiving the time delay of the second execution signal.

By adopting the technical scheme, the movable template is provided with the follow-up travel switch, and the fixed mould is provided with the avoidance groove capable of accommodating the follow-up travel switch and used for preventing the follow-up travel switch from being triggered when the follow-up travel switch is over against the avoidance groove; the number of the avoiding grooves is equal to that of the follow-up travel switches, so that the follow-up travel switches are positioned in the avoiding grooves when the mold is closed in the primary injection molding process, and the follow-up travel switches are triggered by the fixed mold when the mold is closed in the secondary injection molding process; when the air blowing function starting module detects that the follow-up travel switch is touched to be closed, namely, the secondary injection molding die assembly, the air blowing function starting module sends an air blowing function starting signal, the second switch module sends a second switch signal after receiving the air blowing function starting signal, the second execution module sends a second execution signal after receiving the second switch signal, the third execution module sends a third execution signal after receiving the third switch signal and delays for a period of time to control the air blowing function to be started, the secondary injection molding die assembly is convenient to finish the injection molding by waiting for the second molding body after the secondary injection molding, and the air blowing function is started after the second molding body finishes the injection molding, so that the second molding body, namely, a finished product of the two-color injection molding piece is demoulded.

Preferably, the following components: the second execution module comprises a power-off delay relay KT2, one end of a coil of the power-off delay relay KT2 is electrically connected to the second switch module, the other end of the coil is grounded, the power-off delay relay KT2 comprises a normally open contact switch KT2-1, and the normally open contact switch KM2-1 is connected in series with a power supply loop of the third execution module; the third execution module comprises an electrified time-delay relay KT3, a coil of the electrified time-delay relay KT3 is connected in series with a normally-open contact switch KT2-1, the electrified time-delay relay KT3 comprises a normally-open contact switch KT3-1, and the normally-open contact switch KT3-1 is connected in series with a power supply loop of the air pump, the electromagnet, the third electromagnetic valve and the fourth electromagnetic valve.

By adopting the technical scheme, the optimal time node for starting the air blowing function is the time for opening the mold after the secondary injection molding is finished, and the follow-up travel switch is triggered when the secondary injection molding is closed, so that the air blowing function needs to be delayed to be opened after the secondary injection molding is finished, and the second switch module stops sending a second switch signal due to the disconnection of the follow-up travel switch when the secondary injection molding is opened; the second execution module comprises a power-off time-delay relay KT2, a coil of the power-off time-delay relay KT2 is connected to the second switch module, a normally-open contact switch KT2-1 of the power-off time-delay relay KT2 is connected in series with a power supply loop of a coil of an electrified time-delay relay KT3, the normally-open contact switch KT3-1 of the electrified time-delay relay KT3 is connected in series with an air pump, an electromagnet, a power supply loop of a third electromagnetic valve and a fourth electromagnetic valve, the power supply loop of the coil of the electrified time-delay relay KT3 is controlled to be closed when a second switch signal is received, the electrified time-delay relay KT3 can be started when secondary injection molding is completed and then mold opening is completed, the power-off time-delay relay KT2 utilizes the power-off time-delay characteristic to play a role after the second switch signal stops sending, the power is continuously supplied to the third time-delay relay KT3, the effect of starting the air blowing function when the secondary injection molding is completed and then the mold opening is realized, and the power-off time-delay relay KT2 can play a role of controlling the air blowing duration.

Preferably: the openings of the first sliding groove and the second sliding groove are arranged in a chamfering mode.

Through adopting above-mentioned technical scheme, the equal chamfer setting of opening part of first spout and second spout is convenient for improve the smoothness of transition between first spout opening and first forming die cavity, second spout opening and the second forming die cavity, is convenient for promote when first case or second case reset to be located the remaining plastics of first spout opening or second spout opening part, makes remaining plastics break away from first spout and second spout to reduce the possibility that first spout and second spout are blockked up.

The second invention of the present application is realized by the following technical scheme:

a processing technology of a double-color mold comprises the following steps:

step 1: processing plates, namely selecting the plates of the fixed die, the movable die frame and the movable die plate respectively, and milling all surfaces of the plates according to the size parameters;

step 2: performing heat treatment, namely quenching each plate, and then tempering the plate after quenching treatment;

and step 3: machining, namely machining a positioning structure and a connecting structure of a fixed die, a movable die frame and a movable die plate, machining a first molding cavity and a second molding cavity on the fixed die, and machining two core molding parts on the movable die plate;

step 3-1: processing positioning grooves, holes, blocks, connecting grooves, holes and blocks on the fixed die, the movable die frame and the movable die plate according to the position relation and the assembly relation of all parts of the double-color die;

step 3-2: according to the shape and the size of a first molded body of an injection molding part, two mold core molding parts are processed on a movable mold plate, and a first cavity is processed on a fixed mold; processing a second cavity on the fixed die according to the shape and the size of a second molded body of the injection molded part;

step 3-3: processing a first chute and a second chute on the movable template, processing openings of a first exhaust passage and a bidirectional flow passage on the side wall of the first chute, and processing an opening of a second exhaust passage on the side wall of the second chute;

and 4, step 4: surface treatment, namely performing wear-resistant and corrosion-resistant treatment on the surfaces of the fixed die, the movable die frame and the movable template;

and 5: and assembling all parts of the double-color mold, and inspecting the assembled double-color mold.

By adopting the technical scheme, the plates of the fixed die, the movable die frame and the movable die plate are selected and then processed to obtain a plurality of plates according with the size parameters of the die frame; quenching the plate to improve the surface hardness of the plate and further improve the wear resistance of the plate, and tempering the quenched plate to reduce the stress of the plate caused by quenching; processing positioning grooves, positioning holes, positioning blocks, connecting grooves, connecting holes and connecting blocks on the plates according to the position relation and the assembly relation of parts of the double-color mold so as to assemble the double-color mold in the subsequent process; according to the shape and the size of a first molded body of an injection molding piece, two mold core molding parts are processed on a movable mold plate, a first mold cavity is processed on a fixed mold, and then a second mold cavity is processed on the fixed mold according to the shape and the size of a second molded body of the injection molding piece, so that the first molded cavity and the second molded cavity can be conveniently formed after the fixed mold and the movable mold plate are assembled; processing a first sliding chute and a second sliding chute on the movable template, processing an opening of a first exhaust passage and a bidirectional flow passage on the side wall of the first sliding chute, and processing an opening of a second exhaust passage on the side wall of the second sliding chute so as to assemble a first exhaust valve and a second exhaust valve in the following process; the surfaces of the fixed die, the movable die frame and the movable die plate are subjected to wear-resistant and corrosion-resistant treatment so as to improve the wear-resistant performance and corrosion-resistant performance of the die and slow down the damage of the double-color die in the normal use process; and assembling and inspecting parts of the double-color mold to obtain a finished product of the double-color mold.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the mold core forming part is fixedly connected with a first exhaust valve, the first exhaust valve comprises a first chute, a first valve core and a first elastic part, wherein an opening of the first chute is arranged on the surface of the mold core forming part, the movable mold plate is provided with a first exhaust passage, one end of the first exhaust passage is communicated with the first chute, and the other end of the first exhaust passage is communicated with the outside to be used as a passage for exhausting gas in the forming cavity; the first valve core is connected with the first sliding groove in a sliding mode, two ends of the first elastic piece are fixedly connected to the bottom of the first sliding groove and the first valve core respectively, and when the first elastic piece is not subjected to external force, the first valve core blocks the first exhaust channel; because the gas in the extrusion molding cavity can be formed when the molten plastic is filled in the molding cavity, the volume of the gas is compressed and the gas pressure is increased, the pressure generated by the gas to the first valve core is utilized to push away the first valve core and the gas is discharged from the first gas discharge passage, and when the pressure generated by the gas discharged to the residual gas is not enough to push away the first valve core, the first valve core is reset and blocks the first gas discharge passage again, so that the possibility that the molten plastic flows into the first gas discharge passage to block the first gas discharge passage is reduced.

2. When the double-color mold with the rotary mold core is used for double-color injection molding, the first molded body needs to be rotated to a position right opposite to the second molded cavity, so that secondary mold closing is facilitated to form the second molded cavity, and when the movable mold plate rotates, the problem that the first molded body is loosened and even falls off from the movable mold plate is easy to occur, so that the problem that the quality of the second molded body formed by secondary injection molding is poor and secondary injection molding cannot be performed is caused; the bottom of the first sliding groove is provided with an electromagnet for attracting the first valve core, so that the function of actively controlling the movement of the first valve core is realized through the electromagnet; the movable template is provided with an air exhaust flow passage, one end of the air exhaust flow passage is communicated with the first sliding groove, the other end of the air exhaust flow passage is communicated with the outside, and an air pump is arranged in the air exhaust flow passage, so that air in a space between the first sliding groove and the first molded body can be conveniently exhausted through the air pump to form negative pressure, the function of sucking the first molded body is further achieved, the possibility of loosening and even falling between the first molded body and the movable template is reduced, and the finished product fraction defective of the double-color injection molded part is reduced; on the other hand, the opening of first gas vent at first spout lateral wall is closer to the bottom of first spout for the opening of the runner of bleeding at first spout lateral wall to control first case shutoff first gas vent when opening the runner of bleeding, when reducing the air pump and bleed, the possibility in space between first spout and the first shaping body is got into from first gas vent to the external gas, thereby has improved the suction effect to first shaping body.

3. After the finished injection molding piece is finished, the finished injection molding piece is usually pushed by a push rod to be separated from the movable template, and the surface of the finished injection molding piece is easy to scratch when the finished injection molding piece is pushed by the push rod; the movable template is provided with an air exhaust flow passage, one end of the air exhaust flow passage is communicated with the first sliding groove, the other end of the air exhaust flow passage is communicated with the outside, and an air pump is arranged in the air exhaust flow passage, so that air can be conveniently blown into a space between the first sliding groove and the first molded body through the air pump, the function of pushing a finished injection molding piece to be separated from the movable template through the blown air is further achieved, the possibility of surface scratching in the demolding process of the finished injection molding piece is reduced, meanwhile, a push rod and a driving piece for driving the push rod are not needed, the structure of the double-color injection molding equipment is simplified, and therefore the equipment cost, the maintenance cost and the failure rate are reduced; on the other hand, the opening of the first exhaust passage on the side wall of the first sliding groove is closer to the bottom of the first sliding groove relative to the opening of the blowing passage on the side wall of the first sliding groove, so that the first valve core is controlled to open the blowing passage and simultaneously block the first exhaust passage, the possibility that the blown gas leaks from the first exhaust passage when the gas is blown by the gas pump is reduced, and the blowing and demolding effects on finished injection molding parts are improved.

Drawings

Fig. 1 is a schematic structural diagram of a two-color mold according to an embodiment of the present application.

Fig. 2 is a schematic structural view of another viewing angle of the two-color mold in the first embodiment of the present application.

Fig. 3 is a sectional view of a two-color mold in a clamped state according to the first embodiment of the present application.

Fig. 4 isbase:Sub>A cross-sectional view of sectionbase:Sub>A-base:Sub>A in fig. 3.

Fig. 5 is a top view of a two-color mold according to an embodiment of the present disclosure.

Fig. 6 is a cross-sectional view of section B-B in fig. 5.

Fig. 7 is a schematic diagram of a bidirectional flow channel according to an embodiment of the present application.

Fig. 8 is a circuit diagram of a first control circuit according to a first embodiment of the present application.

Fig. 9 is a circuit diagram of a second control circuit in the first embodiment of the present application.

Description of reference numerals:

100. a first molded body; 200. a second molded body; 1. fixing a mold; 101. a first cavity; 102. a second cavity; 103. a guide sleeve; 104. a position avoiding groove; 105. injection molding a tube; 2. moving the mold; 21. moving the die carrier; 22. moving the template; 211. a guide post; 221. a core forming section; 222. a first exhaust valve; 223. a first chute; 224. a first valve spool; 225. a first elastic member; 226. a second exhaust valve; 227. a second chute; 228. a second valve core; 229. a second elastic member; 2231. a first exhaust duct; 2232. an electromagnet; 2271. a second exhaust passage; 3. a rotary die drive assembly; 4. a bidirectional flow channel; 41. a first solenoid valve; 42. a second solenoid valve; 43. a third solenoid valve; 44. a fourth solenoid valve; 45. an air pump; 5. an air extraction function starting module; 51. a self-locking travel switch; 6. a first switch module; 7. a first execution module; 8. a blowing function starting module; 81. a follow-up travel switch; 9. a second switch module; 10. a second execution module; 11. and a third execution module.

Detailed Description

The present application is described in further detail below with reference to figures 1 to 9.

Example one

The double-color injection molding equipment comprises an equipment body, a double-color mold and two plastic injectors which are respectively used for storing different types of raw materials, wherein the equipment body is used for bearing and installing the double-color mold, the first plastic injector and the second plastic injector, the equipment body is provided with a mold closing driving assembly used for driving the mold closing and mold opening of the double-color mold, and a power supply device used for supplying power to the mold closing driving assembly, the first plastic injector and the second plastic injector.

As shown in fig. 1 and fig. 2, the application discloses a two-color mold, which includes a fixed mold 1 and a movable mold 2, wherein the fixed mold 1 is fixedly connected to an apparatus body (not shown in the figure), the movable mold 2 is slidably connected to the apparatus body, a first cavity 101 and a second cavity 102 are formed in one surface of the fixed mold 1 close to the movable mold 2, the fixed mold 1 is fixedly connected with two injection molding tubes 105, two ends of one injection molding tube 105 are respectively communicated with one side of the first cavity 101 and a first plastic injector (not shown in the figure), and two ends of the other injection molding tube 105 are respectively communicated with one side of the second cavity 102 and a second plastic injector (not shown in the figure); the movable mould 2 comprises a movable mould frame 21 and a movable mould plate 22, one end of the movable mould frame 21 close to the fixed mould 1 is provided with a mould plate groove for accommodating the movable mould plate 22, the movable mould plate 22 is in a circular plate shape, one end of the movable mould frame 21 far away from the fixed mould 1 is fixedly connected with a rotary mould driving component 3, in the embodiment, the rotary mould driving component 3 is a rotating motor, the movable mould frame 21 is provided with a through hole for an output shaft of the rotating motor to penetrate through, and the output shaft of the rotating motor penetrates through the movable mould frame 21 and is fixedly connected with the movable mould plate 22; one surface of the movable die plate 22 close to the fixed die 1 is provided with two core forming parts 221, and the two core forming parts 221 are symmetrical along the center of the output shaft of the rotating motor.

One side of the movable mould frame 21 close to the fixed mould 1 is fixedly connected with four guide posts 211, and one side of the fixed mould 1 close to the movable mould frame 21 is provided with four guide sleeves 103 matched with the guide posts 211 for guiding the movable mould 2 and the fixed mould 1 to accurately mould, so that the mould closing precision is improved.

When the double-color injection molding equipment is used for producing the double-color injection molding part, the specific steps and flows are as follows:

referring to fig. 3 and 4, S1: when the movable mould plate 22 is located at the initial position, the projections of the two core forming parts 221 on the fixed mould 1 are respectively located in the first cavity 101 and the second cavity 102, the mould closing driving component (not shown in the figure) controls the mould base 21 to move towards the direction of the fixed mould 1, the movable mould plate 22 is abutted to the fixed mould 1, one core forming part 221 is located in the first cavity 101, the cavity between the core forming part 221 and the first cavity 101 is a first forming cavity, and the other core forming part 221 is located in the second cavity 102;

referring to fig. 5 and 6, S2: primary injection molding: a first plastic injector injects molten plastic into a first molding cavity through an injection molding pipe 105, and the molten plastic is cooled to form a first molded body 100;

s3: the mold closing driving component controls the mold closing driving component to move the mold closing driving component 21 towards the direction far away from the fixed mold 1, so that the first molded body 100 moves along with the movable mold plate 22, the rotary mold driving component 3 controls the movable mold plate 22 to rotate 180 degrees, at the moment, the projection of the first molded body 100 on the fixed mold 1 is positioned in the second cavity 102, and the projection of the other mold core molding part 221 on the fixed mold 1 is positioned in the first cavity 101;

s4: the mold closing driving component controls the mold closing driving component to move the mold closing driving component 21 towards the direction of the fixed mold 1, so that the movable mold plate 22 is abutted against the fixed mold 1, the first molded body 100 is positioned in the second cavity 102, the cavity between the first molded body 100 and the second cavity 102 is a second molded cavity, and the cavity between the other mold core molding part 221 and the first cavity 101 is a first molded cavity;

s5: primary injection molding: a first plastic injector injects molten plastic into a first molding cavity through an injection molding pipe 105, and the molten plastic is cooled to form a first molded body 100; and simultaneously, carrying out secondary injection molding: a second plastic injector injects molten plastic into a second molding cavity through an injection molding pipe 105, the molten plastic is cooled to form a second molded part 200, and the second molded part 200 is a finished product of a two-color injection molded part;

s6: the mold closing driving assembly controls the mold closing driving assembly to move the mold closing driving assembly 21 towards the direction far away from the fixed mold 1, so that the first molded body 100 and the second molded body 200 move along with the movable mold plate 22, the rotary mold driving assembly 3 controls the movable mold plate 22 to rotate 180 degrees, the second molded body 200 is demolded, at the moment, the projection of the first molded body 100 on the fixed mold 1 is positioned in the second cavity 102, and the projection of the other mold core molding part 221 on the fixed mold 1 is positioned in the first cavity 101;

steps S4 to S6 are repeated to continue the production of the two-color injection molded part, and in this embodiment, the computer programs for controlling the driving direction, driving force, and driving sequence of the mold closing driving assembly to the movable mold base 21 and the mold rotating driving assembly 3 to the movable mold platen 22 are all the prior art.

Referring to fig. 6 and 7, a first exhaust valve 222 is fixedly connected to the core forming portion 221, the first exhaust valve 222 includes a first sliding groove 223, a first valve core 224 and a first elastic member 225, an opening of the first sliding groove 223 is located on a surface of the core forming portion 221 and communicated with the first forming cavity, the first valve core 224 is slidably connected to the first sliding groove 223, one end of the first elastic member 225 is fixedly connected to a bottom of the first sliding groove 223, the other end of the first elastic member 225 is fixedly connected to the first valve core 224, the movable die plate 22 is provided with a first exhaust passage 2231, one end of the first exhaust passage 2231 is communicated with the first sliding groove 223, and the other end is communicated with the outside; the first elastic member 225 is a spring, and the length and mechanical property parameters of the first elastic member 225 are selected as follows: when the first valve core 224 is not subjected to external force, the first valve core 224 blocks the first exhaust channel 2231, the end surface of one end of the first valve core 224, which is far away from the bottom of the first sliding groove 223, is flush with the surface of the core forming part 221, when the first elastic part 225 is compressed to open the opening of the first exhaust channel 2231 when the first valve core 224 moves to the first exhaust channel 2231, the pressure borne by the first valve core 224 is greater than the pressure generated by the molten plastic on the first valve core 224 during one-time injection molding, so that the effect that the first exhaust channel 2231 can only exhaust high-pressure gas and cannot exhaust the molten plastic is achieved, on one hand, the defects of a finished product of a two-color injection molding part at the first exhaust channel 222 are reduced, and on the other hand, the possibility that the first exhaust channel 2231 is blocked by the molten plastic is also reduced.

Preferably, the first exhaust valve 222 is located at one end of the first molding cavity far away from the communicating injection pipe 105, so that the first exhaust valve 222 is located at the end of the flow of the molten plastic during one-time injection, and the exhaust effect of the first exhaust valve 222 during one-time injection is improved; first vent 222 is located on the finished non-exterior surface of the bi-injection molded part and on the finished non-assembly surface of the bi-injection molded part to reduce the effect of imperfections in the finished bi-injection molded part at first vent 222 on the appearance and assembly of the part.

The core forming portion 221 is fixedly connected with a second exhaust valve 226, the second exhaust valve 226 includes a second chute 227, a second valve core 228 and a second elastic member 229, an opening of the second chute 227 is located on the surface of the core forming portion 221 and communicated with the second forming cavity, the second valve core 228 is slidably connected to the second chute 227, one end of the second elastic member 229 is fixedly connected to the bottom of the second chute 227, the other end of the second elastic member 229 is fixedly connected to the second valve core 228, the movable mold plate 22 is provided with a second exhaust passage 2271, one end of the second exhaust passage 2271 is communicated with the first chute 223, and the other end is communicated with the outside; the second elastic member 229 is a spring, and the length and mechanical property parameters of the second elastic member 229 are selected as follows: when the second valve core 228 is not subjected to external force, the second exhaust passage 2271 is blocked by the second valve core 228, the end face of one end, away from the bottom of the second sliding groove 227, of the second valve core 228 is flush with the surface of the core forming part 221, and when the second elastic part 229 is compressed to enable the second valve core 228 to move to open the opening of the second exhaust passage 2271, the pressure applied to the second valve core 228 is greater than the pressure applied to the second valve core 228 by molten plastic during secondary injection, so that the effect that the second exhaust passage 2271 only can exhaust high-pressure gas and cannot exhaust the molten plastic is achieved, on one hand, defects of a finished two-color injection molding part at the second exhaust valve 226 are reduced, and on the other hand, the possibility that the second exhaust passage 2271 is blocked by the molten plastic is also reduced.

Preferably, the second vent valve 226 is located at an end of the second mold cavity far away from the communicating injection tube 105, so that the second vent valve 226 is located at the end of the molten plastic flowing during the second injection molding, thereby facilitating the improvement of the venting effect of the second vent valve 226 during the second injection molding; the second exhaust valve 226 is positioned on the non-appearance surface of the finished bi-color injection molding part and on the non-assembly surface of the finished bi-color injection molding part, so that the influence of the flaws of the finished bi-color injection molding part at the second exhaust valve 226 on the appearance and assembly of the product is reduced; the openings of the first sliding groove 223 and the second sliding groove 227 are arranged in a chamfering mode, so that the transition smoothness between the opening of the first sliding groove 223 and the first molding cavity and between the opening of the second sliding groove 227 and the second molding cavity is improved, the residual plastic at the opening of the first sliding groove 223 or the opening of the second sliding groove 227 is pushed when the first valve core 224 or the second valve core 228 is reset, the residual plastic is separated from the first sliding groove 223 and the second sliding groove 227, and therefore the possibility that the first sliding groove 223 and the second sliding groove 227 are blocked is reduced.

An electromagnet 2232 for attracting the first valve element 224 is disposed at the bottom of the first sliding groove 223, and in the present embodiment, the first valve element 224 is made of iron, cobalt, nickel, or an alloy material of iron, cobalt, and nickel; the function of actively controlling the movement of the first spool 224 by the electromagnet 2232 is facilitated.

The movable template 22 is provided with a bidirectional flow channel 4, one end of the bidirectional flow channel 4 is communicated with the first sliding groove 223, the other end of the bidirectional flow channel 4 is communicated with the outside, and an opening of the first gas exhaust channel 2231, which is located on the side wall of the first sliding groove 223, is closer to the bottom of the first sliding groove 223 than an opening of the bidirectional flow channel 4, which is located on the side wall of the first sliding groove 223, so that the first valve core 224 can be controlled to open the gas exhaust channel and simultaneously block the first gas exhaust channel 2231; the bidirectional flow channel 4 comprises an airflow junction point I, an airflow junction point a, an airflow junction point B and an airflow junction point O, a flow channel section IA, a flow channel section AB, a flow channel section BO, a flow channel section IB and a flow channel section AO are formed among the airflow junction points, wherein the flow channel section IA is provided with a first electromagnetic valve 41 for controlling the on-off of an airflow channel of the flow channel section IA, the flow channel section BO is provided with a second electromagnetic valve 42 for controlling the on-off of an airflow channel of the flow channel section BO, the flow channel section IB is provided with a third electromagnetic valve 43 for controlling the on-off of an airflow channel of the flow channel section IB, and the flow channel section AO is provided with a fourth electromagnetic valve 44 for controlling the on-off of an airflow channel of the flow channel section AO; the flow channel section AB is provided with an air pump 45 for pumping air from an airflow junction A to an airflow junction B when power is on, the airflow junction I is communicated with the first sliding groove 223, and the airflow junction O is communicated with the outside air; in this embodiment, fig. 7 is only used to show the communication relationship between each flow channel segment of the bidirectional flow channel 4 and the airflow junction, and the corresponding installation position relationship between the flow channel segment and each electromagnetic valve, the flow channel segment and the air pump 45, and the size, shape, and size proportional relationship between the flow channel segments shown in the drawing are not equal to the size, shape, and position relationship of the actual bidirectional flow channel 4 in the movable template 22.

Referring to fig. 8 and 9, the air pump 45 is electrically connected to a first control circuit for controlling the starting of the air pumping function and a second control circuit for controlling the starting of the air blowing function, specifically, the moving mold 2 of the present application is provided with two core forming portions 221, each core forming portion 221 is provided with one air pump 45, and each air pump 45 is electrically connected to an independent first control circuit and second control circuit; the first control circuit comprises a pumping function starting module 5, a first switching module 6 and a first execution module 7.

One side of the movable mould frame 21 close to the fixed mould 1 is fixedly connected with a self-locking travel switch 51, when the injection molding is carried out for the first time, the movable mould frame 21 moves to a mould closing state towards the fixed mould 1, the self-locking travel switch 51 is closed and self-locked due to being triggered, so that the self-locking travel switch 51 is in a continuous closing state, when the self-locking travel switch 51 is triggered during the secondary injection mould closing, the self-locking travel switch 51 is disconnected and self-locked, so that the self-locking travel switch 51 is in a continuous closing state; because the two-color mold can process two-color injection-molded parts at the same time, and the two injection-molded parts are in different states, the number of the self-locking travel switches 51 is two, the two self-locking travel switches 51 are respectively connected to the first control circuit of one air pump 45, and the on-off states of the two self-locking travel switches 51 at the same time are opposite.

The air exhaust function starting module 5 is used for detecting the on-off condition of the self-locking travel switch 51 so as to send an air exhaust function starting signal when the self-locking travel switch 51 is detected to be closed, the air exhaust function starting module 5 comprises the self-locking travel switch 51, one end of the self-locking travel switch 51 is electrically connected to a power supply voltage VCC, and the other end of the self-locking travel switch 51 is electrically connected to the first switch module 6.

The first switch module 6 is electrically connected to the pumping function starting module 5 to send a first switching signal when receiving the pumping function starting signal, the first switch module 6 includes an NPN-type first triode Q1 and a first resistor R1, a base of the first triode Q1 is electrically connected to the self-locking travel switch 51, a collector of the first triode Q1 is electrically connected to the power supply voltage VCC after being connected in series with the first resistor R1, and an emitter of the first triode Q1 is electrically connected to the first execution module 7.

The first execution module 7 is electrically connected to the first switch module 6 and is connected in series to the power supply loops of the air pump 45, the electromagnet 2232, the first electromagnetic valve 41 and the second electromagnetic valve 42 to send a first execution signal to control the starting of the air suction function after a time delay when receiving a first switch signal, the first execution module 7 comprises an electrified delay relay KT1, one end of a coil of the electrified delay relay KT1 is connected in series to an emitter of a first triode Q1, the other end of the coil is grounded, the electrified delay relay KT1 comprises a plurality of normally open contact switches KT1-1 which are linked with one another, and each normally open contact switch KT1-1 is connected in series to the power supply loop of the air pump 45, the electromagnet 2232, the first electromagnetic valve 41 and the second electromagnetic valve 42 respectively; in the present embodiment, the delay time period of the energization delay relay KT1 should be set to be equal to or slightly shorter than the time required between mold closing and mold opening in one injection molding process, so that the pumping function is turned on again to attract the first molded body 100 after the first molded body 100 is cooled and solidified, to reduce the influence of the pumping function on the quality of the first molded body 100.

The second control circuit comprises a blowing function starting module 8, a second switch module 9 and a second execution module 10.

One surface of the movable mould plate 22 close to the fixed mould 1 is fixedly connected with two follow-up travel switches 81, and as the two-color mould can simultaneously process two-color injection molded parts which are in different states, the number of the follow-up travel switches 81 is two, and the two follow-up travel switches 81 are respectively connected with a second control circuit of the air pump 45; one surface of the fixed die 1 close to the movable die plate 22 is provided with a spacing groove 104, the spacing groove 104 is cylindrical, the distance between the spacing groove 104 and the rotating axis of the movable die plate 22 is equal to the distance between the geometric center of the follow-up travel switch 81 and the rotating axis of the movable die plate 22, and the space of the spacing groove 104 is larger than the volume of the follow-up travel switch 81, so that the effect of not touching the follow-up travel switch 81 when die assembly is realized by using the spacing groove 104; each follow-up travel switch 81 corresponds to one avoidance groove 104, and because the angle of rotation of the movable template 22 at each time is 180 degrees, when the movable mold 2 moves towards the fixed mold 1 to mold closing, if the follow-up travel switch 81 is positioned in the avoidance groove 104, the follow-up travel switch is not triggered, and if the follow-up travel switch 81 is not positioned in the avoidance groove 104, the follow-up travel switch 81 is triggered by the fixed mold 1, so that the function that the follow-up travel switch 81 is triggered once every two times of mold closing is realized; the positions of the two follow-up travel switches 81 and the two avoiding grooves 104 are set according to the mode that one follow-up travel switch 81 is triggered and the two follow-up travel switches 81 are triggered in turn when the mold is closed each time; specifically, the positions of the two follow-up travel switches 81 are circumferentially arranged at intervals of 90 ° along the rotation axis of the movable die plate 22, and the positions of the two avoiding grooves 104 are circumferentially arranged at intervals of 90 ° along the rotation axis of the movable die plate 22; when the primary injection mold is closed, the follow-up travel switch 81 is positioned in the avoiding groove 104, and when the secondary injection mold is closed, the follow-up travel switch 81 is touched by the fixed mold 1.

The blowing function starting module 8 is used for detecting the on-off condition of the follow-up travel switch 81 so as to send a blowing function starting signal when detecting that the follow-up travel switch 81 is closed, the blowing function starting module 8 comprises the follow-up travel switch 81, one end of the follow-up travel switch 81 is electrically connected to a power supply voltage VCC, and the other end of the follow-up travel switch 81 is electrically connected to the second switch module 9.

The second switch module 9 is electrically connected to the blowing function starting module 8 to send a second switch signal when receiving the blowing function starting signal, the second switch module 9 includes an NPN-type second transistor Q1 and a second resistor R2, a base of the second transistor Q2 is electrically connected to the follow-up travel switch 81, a collector of the second transistor Q2 is electrically connected to the power supply voltage VCC after being connected in series with the second resistor R2, and an emitter of the second transistor Q2 is electrically connected to the second execution module 10.

The second execution module 10 is electrically connected to the second switch module 9 to send a second execution signal when receiving the second switch signal, the second execution module 10 includes a power-off delay relay KT2, one end of a coil of the power-off delay relay KT2 is connected in series to an emitter of the second triode Q2, the other end of the coil is connected in ground, the power-off delay relay KT2 includes a normally-open contact switch KT2-1, and the normally-open contact switch KT2-1 is connected in series to a power supply loop of the third execution module 11.

The third execution module 11 is electrically connected to the second execution module 10 and is connected in series to a power supply loop of the air pump 45, the electromagnet 2232, the third electromagnetic valve 43 and the fourth electromagnetic valve 44, so as to send a third execution signal to control the start of the blowing function when receiving the time delay of the second execution signal and send the third execution signal for a period of time, the third execution module 11 comprises an electrified delay relay KT3, one end of a coil of the electrified delay relay KT3 is electrically connected to a power supply voltage VCC, the other end of the coil is connected in series with a normally-open contact switch KT2-1 and then grounded, the electrified delay relay KT3 comprises a plurality of normally-open contact switches KT3-1 which are linked with each other, and each normally-open contact switch KT3-1 is respectively connected in series to the power supply loop of the air pump 45, the electromagnet 2232, the third electromagnetic valve 43 and the fourth electromagnetic valve 44; in the embodiment, the delay time of the power-off delay relay KT2 is the sum of the time required from mold closing to mold opening of secondary injection molding and the starting time of the air blowing function, and preferably, the starting time of the air blowing function is 1 second; the time delay of the electrifying time delay relay KT3 is the time required by secondary injection molding from mold closing to mold opening, so that the air blowing function is started after the second molded part 200 is cooled and solidified to demould the second molded part 200, namely a finished product of a two-shot injection molded part, and the influence of the air blowing function on the quality of the second molded part 200 is reduced.

In this embodiment, the number of resistors and the specific resistance value can be increased, decreased and adjusted according to actual needs, and a person skilled in the art knows that if direct connection is performed between electronic components, the electronic components may be damaged, and the resistor is used for voltage division or shunting.

The implementation principle of the embodiment is as follows: when the double-color mold in the application is used for producing the double-color injection molding part, the steps are as follows:

s1: performing primary injection molding and die assembly, wherein a die assembly driving assembly controls a die frame 21 to move towards the direction of a fixed die 1, and a movable die plate 22 is abutted against the fixed die 1 to form a first molding cavity; the self-locking travel switch 51 is triggered to be in a closed state, the air pumping function starting module 5 sends an air pumping function starting signal, the first switch module 6 sends a first switch signal after receiving the air pumping function starting signal, and the first execution module 7 sends a first execution signal after receiving the first switch signal and delays a period of time to control the starting of the air pumping function;

s2: primary injection molding: the first plastic injector injects molten plastic into the first molding cavity, and the molten plastic is cooled to form a first molded body 100;

s3: after one-time injection molding is finished, the mold is opened, the mold closing driving assembly controls the mold base 21 to move towards the direction far away from the fixed mold 1, the air suction function is started, the first molded body 100 is attracted, the rotary mold driving assembly 3 controls the movable mold plate 22 to rotate 180 degrees, so that the first molded body 100 is aligned to the second cavity 102, and the other mold core molding part 221 is aligned to the first cavity 101;

s4: performing secondary injection molding and die assembly, wherein the die assembly driving component controls the die frame 21 to move towards the direction of the fixed die 1, and the movable die plate 22 is abutted against the fixed die 1 to form a second forming cavity and a first forming cavity; the self-locking travel switch 51 is triggered again to be in a disconnected state, the air exhaust function starting module 5 stops sending an air exhaust function starting signal, and the air exhaust function stops; the follow-up travel switch 81 is triggered to be in a closed state, the blowing function starting module 8 sends a blowing function starting signal, the second switch module 9 sends a second switch signal after receiving the blowing function starting signal, the second execution module 10 sends a second execution signal after receiving the second switch signal, and the third execution module 11 sends a third execution signal after receiving the third switch signal and delays for a period of time to control the blowing function to be started;

s5: the primary injection molding and the secondary injection molding are carried out simultaneously: a first plastic injector injects molten plastic into a first molding cavity through an injection molding pipe 105, and the molten plastic is cooled to form a first molded body 100; meanwhile, a second plastic injector injects molten plastic into the second molding cavity through the injection pipe 105, and the molten plastic is cooled to form a second molded body 200;

s6: after the primary injection molding and the secondary injection molding are finished, the mold is opened, the mold closing driving assembly controls the mold base 21 to move towards the direction far away from the fixed mold 1, and the air blowing function is started to demould the second molded body 200; the rotary die driving assembly 3 controls the movable die plate 22 to rotate 180 degrees, at this time, the first molded body 100 is aligned with the second cavity 102, and the other core molding part 221 is aligned with the first cavity 101;

steps S4 to S6 are repeated to continue the production of the two-color injection molded part.

Example two

The application discloses a double-color mold processing technology, which comprises the following steps:

step 1: processing plates, namely selecting the plates of the fixed die 1, the movable die frame 21 and the movable die plate 22 respectively, and milling all surfaces of the plates according to size parameters; the method comprises the steps of selecting a plate made of a proper material according to the material type and the processing condition of an injection molding part, and cutting and milling the plate according to the size parameter meeting the actual use requirement of injection molding equipment to obtain the plate meeting the size parameter and the use requirement of the double-color mold.

Step 2: performing heat treatment, namely quenching each plate to improve the surface hardness of the plate and further improve the wear resistance of the plate, and then tempering the plate after quenching treatment to reduce the stress of the plate caused by quenching; carrying out heat treatment on the plate obtained in the step 1 according to actual use requirements, wherein the heat treatment comprises quenching and tempering; quenching the plate: preheating temperature is 600-850 ℃, quenching temperature is 1020-1050 ℃, and heat preservation time is 30 minutes; tempering the plate: the tempering temperature is 250 ℃, and the holding time is 2 hours.

And 3, step 3: machining, namely machining a positioning structure and a connecting structure of the fixed die 1, the movable die frame 21 and the movable die plate 22, machining a first molding cavity and a second molding cavity on the fixed die 1, and machining two core molding parts 221 on the movable die plate 22; and simultaneously machining other parts on the double-color mold, including the guide pillar 211, the guide sleeve 103, the injection molding pipe 105, the first elastic piece 225, the second elastic piece 229, the first valve core 224, the second valve core 228 and the like.

Step 3-1: processing positioning grooves, holes, blocks, connecting grooves, holes and blocks on the fixed die 1, the movable die frame 21 and the movable die plate 22 according to the position relation and the assembly relation of all parts of the double-color die; the assembling relation and the position relation of the fixed die 1, the movable die carrier 21 and the movable die plate 22 are obtained according to the design drawing of the double-color die, and structures such as positioning grooves, positioning holes, positioning blocks, connecting grooves, connecting holes, connecting blocks and the like are machined on each plate by using machine tools such as a milling machine, a drilling machine, a boring machine and the like, so that the double-color die can be assembled in the subsequent process.

Step 3-2: according to the shape and size of the first molded body 100 of the injection molding part, two core molding parts 221 are processed on the movable mold plate 22 by using a machine tool such as a milling machine, and a first cavity 101 is processed on the fixed mold 1; according to the shape and size of the second molded body 200 of the injection molded part, a second cavity 102 is machined on the fixed mold 1; according to the shape and the size of a first molded body 100 of an injection molding part, two core molding parts 221 are processed on a movable mold plate 22, a first cavity 101 is processed on a fixed mold 1, and then according to the shape and the size of a second molded body 200 of the injection molding part, a second cavity 102 is processed on the fixed mold 1, so that the first molded cavity and the second molded cavity formed after the fixed mold 1 and the movable mold plate 22 are matched are consistent with the shape and the size of a two-color injection molding part needing to be processed, wherein the sizes of a runner and a sprue of the first molded cavity and the second molded cavity are determined according to the volume of each injection molding part.

Step 3-3: a first chute 223 and a second chute 227 are machined in the movable mold plate 22, openings of a first exhaust duct 2231 and a bidirectional flow passage 4 are machined in the side wall of the first chute 223, and an opening of a second exhaust duct 2271 is machined in the side wall of the second chute 227; for subsequent assembly of first exhaust valve 222 and second exhaust valve 226.

And 4, step 4: surface treatment, namely performing wear-resistant and corrosion-resistant treatment on the surfaces of the fixed mould 1, the movable mould frame 21 and the movable mould plate 22; preferably, the surface of the fixed mold 1 provided with the first cavity 101 and the second cavity 102 is subjected to chromium plating, the surface of the movable mold 22 provided with the core forming part 221 is subjected to chromium plating, and other surfaces of the fixed mold 1, the movable mold frame 21 and the movable mold plate 22 are subjected to anticorrosive paint spraying treatment; the anti-corrosion performance of the double-color mold is improved conveniently, and the chromium plating treatment of the surface of the fixed mold 1 provided with the first cavity 101 and the second cavity 102 and the surface of the movable mold plate 22 provided with the mold core forming part 221 is convenient to improve the surface hardness and the corrosion resistance of the first cavity 101, the second cavity 102 and the mold core forming part 221, and reduces the abrasion in the normal use process.

And 5: assembling all parts of the double-color mold, and inspecting the assembled double-color mold; so as to find the existing dimensional error and quality problem and obtain the finished product of the die carrier.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art; the technical solutions described in the foregoing embodiments may still be modified, or some features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A double-color mold comprises a fixed mold (1), a movable mold (2) and a rotating mold driving assembly (3), wherein the movable mold (2) comprises a movable mold base (21) and a movable mold plate (22), the movable mold plate (22) is rotatably connected to the movable mold base (21), two mold core forming parts (221) which are symmetrical with the center of the rotating axis of the movable mold plate (22) are arranged on one surface of the movable mold plate (22) close to the fixed mold (1), a first mold cavity (101) and a second mold cavity (102) which are used for being matched with the two mold core forming parts (221) to form a first mold cavity and a second mold cavity are arranged on one surface of the fixed mold (1) close to the movable mold (2), and the movable mold plate (22) is fixedly connected to the rotating mold driving assembly (3) used for controlling the movable mold plate (22) to rotate; the method is characterized in that: the core forming part (221) is fixedly connected with a first exhaust valve (222), the first exhaust valve (222) comprises a first sliding groove (223), a first valve core (224) and a first elastic part (225), the first valve core (224) is connected to the first sliding groove (223) in a sliding mode, one end of the first elastic part (225) is fixedly connected to the bottom of the first sliding groove (223), the other end of the first elastic part is fixedly connected to the first valve core (224), an opening of the first sliding groove (223) is formed in the surface of the core forming part (221), the movable die plate (22) is provided with a first exhaust channel (2231), one end of the first exhaust channel (2231) is communicated with the first sliding groove (223), the other end of the first exhaust channel is communicated with the outside, and when the first elastic part (225) is not subjected to external force, the first valve core (224) blocks the first exhaust channel (2231).

2. A two-color mold according to claim 1, wherein: the bottom of the first sliding groove (223) is provided with an electromagnet (2232) used for attracting the first valve core (224), the movable mould plate (22) is provided with an air exhaust flow channel, one end of the air exhaust flow channel is communicated with the first sliding groove (223), the other end of the air exhaust flow channel is communicated with the outside, an air pump (45) is arranged in the air exhaust flow channel, and an opening of the first air exhaust channel (2231) in the side wall of the first sliding groove (223) is closer to the bottom of the first sliding groove (223) relative to an opening of the air exhaust flow channel in the side wall of the first sliding groove (223).

3. A two-color mold according to claim 2, characterized in that: the movable mould plate (22) is provided with an air exhaust flow passage, one end of the air exhaust flow passage is communicated with the first sliding groove (223), the other end of the air exhaust flow passage is communicated with the outside, an air pump (45) is arranged in the blowing flow passage, and the opening of the first air exhaust passage (2231) on the side wall of the first sliding groove (223) is closer to the bottom of the first sliding groove (223) relative to the opening of the blowing flow passage on the side wall of the first sliding groove (223).

4. A two-color mold according to claim 1, wherein: the core forming part (221) is fixedly connected with a second exhaust valve (226), the second exhaust valve (226) comprises a second sliding groove (227), a second valve core (228) and a second elastic member (229), the second valve core (228) is slidably connected to the second sliding groove (227), one end of the second elastic member (229) is fixedly connected to the bottom of the second sliding groove (227), the other end of the second elastic member is fixedly connected to the second valve core (228), an opening of the second sliding groove (227) is formed in the surface of the core forming part (221), the movable die plate (22) is provided with a second exhaust passage (2271), one end of the second exhaust passage (2271) is communicated with the side wall of the first sliding groove (223), the other end of the second exhaust passage is communicated with the outside, when the second elastic member (229) is not subjected to an external force, the second exhaust passage (2271) is blocked by the second valve core (228), the first sliding groove (223) is communicated with the first forming cavity, and the second sliding groove (227) is communicated with the second forming cavity.

5. A two-color mold according to claim 3, characterized in that: the air exhaust runner comprises a runner section IA, a runner section AB and a runner section BO, the air exhaust runner comprises the runner section AB, the runner section BO and the runner section BO, the air blowing runner comprises the runner section AB, the runner section IB and the runner section AO, the runner section AB is provided with an air pump (45) for pumping air from the air flow intersection point A to the air flow intersection point B, the air flow intersection point I is communicated with the first sliding groove (223), and the air flow intersection point O is communicated with the outside.

6. A two-color mold according to claim 5, characterized in that: one side fixedly connected with that movable mould frame (21) is close to fixed mould (1) is used for by self-locking travel switch (51) that fixed mould (1) touched when the compound die, self-locking travel switch (51) are closed when once moulding plastics compound die, air pump (45) electricity is connected with the first control circuit that is used for controlling the function start of bleeding, first control circuit includes:

the air extraction function starting module (5) is used for detecting the on-off condition of the self-locking travel switch (51) so as to send an air extraction function starting signal when the self-locking travel switch (51) is detected to be closed;

the first switch module (6) is electrically connected to the air pumping function starting module (5) to send out a first switch signal when receiving the air pumping function starting signal;

and the first execution module (7) is electrically connected to the first switch module (6) and is connected in series in a power supply loop of the air pump (45), the electromagnet (2232), the first electromagnetic valve (41) and the second electromagnetic valve (42) so as to send out a first execution signal to control the starting of the air suction function after a period of time delay when receiving the first switch signal.

7. A two-color mold according to claim 5, characterized in that: one side fixedly connected with that the movable mould board (22) is close to the fixed mould (1) is used for being touched by the fixed mould (1) follow-up travel switch (81) when the compound die, the top mould is close to the one side of movable mould board (22) and has seted up the groove of keeping away (104) that can hold follow-up travel switch (81), the quantity that keeps away groove (104) equals with the quantity of follow-up travel switch (81), air pump (45) electricity is connected with the second control circuit who is used for controlling the function start-up of blowing, the second control circuit includes:

the blowing function starting module (8) is used for detecting the on-off condition of the follow-up travel switch (81) so as to send a blowing function starting signal when the follow-up travel switch (81) is detected to be closed;

the second switch module (9) is electrically connected with the blowing function starting module (8) to send out a second switch signal when receiving the blowing function starting signal;

the second execution module (10) is electrically connected to the second switch module (9) to send out a second execution signal when receiving the second switch signal;

and the third execution module (11) is electrically connected to the second execution module (10) and is connected in series in a power supply loop of the air pump (45), the electromagnet (2232), the third electromagnetic valve (43) and the fourth electromagnetic valve (44) so as to send out a third execution signal for a period of time to control the start of the air blowing function when the second execution signal is received and time delay is carried out.

8. A two-color mold according to claim 7, wherein: the second execution module (10) comprises a power-off delay relay KT2, one end of a coil of the power-off delay relay KT2 is electrically connected to the second switch module (9), the other end of the coil is grounded, the power-off delay relay KT2 comprises a normally-open contact switch KT2-1, and the normally-open contact switch KM2-1 is connected in series with a power supply loop of a third execution die; the third execution module (11) comprises a power-on time delay relay KT3, a coil of the power-on time delay relay KT3 is connected in series with a normally open contact switch KT2-1, the power-on time delay relay KT3 comprises a normally open contact switch KT3-1, and the normally open contact switch KT3-1 is connected in series with a power supply loop of an air pump (45), an electromagnet (2232), a third electromagnetic valve (43) and a fourth electromagnetic valve (44).

9. A two-color mold according to claim 4, wherein: the openings of the first sliding groove (223) and the second sliding groove (227) are arranged in a chamfering mode.

10. A processing technology of a double-color mold is characterized in that: the method comprises the following steps:

step 1: plate processing, namely selecting plates of a fixed die (1), a movable die frame (21) and a movable die plate (22) respectively, and milling all surfaces of the plates according to size parameters;

and step 3: machining, namely machining a positioning structure and a connecting structure of a fixed die (1), a movable die frame (21) and a movable die plate (22), machining a first molding cavity and a second molding cavity on the fixed die (1), and machining two core molding parts (221) on the movable die plate (22);

step 3-1: according to the position relation and the assembly relation of all parts of the double-color mold, processing positioning grooves, holes and blocks, connecting grooves, holes and blocks on the fixed mold (1), the movable mold frame (21) and the movable mold plate (22);

step 3-2: according to the shape and the size of a first molded body (100) of an injection molding part, two core molding parts (221) are processed on a movable mold plate (22), and a first cavity (101) is processed on a fixed mold (1); machining a second cavity (102) on the fixed mould (1) according to the shape and the size of a second molded body (200) of the injection molding piece;

step 3-3: a first sliding groove (223) and a second sliding groove (227) are machined in a movable template (22), openings of a first exhaust duct (2231) and a bidirectional flow passage (4) are machined in the side wall of the first sliding groove (223), and an opening of a second exhaust duct (2271) is machined in the side wall of the second sliding groove (227);

and 4, step 4: surface treatment, namely performing wear-resistant and corrosion-resistant treatment on the surfaces of the fixed die (1), the movable die frame (21) and the movable die plate (22);