Same-cavity double-shot injection mold and injection molding method

Abstract

The present invention relates to the field of injection mold technology, and in particular to a same-cavity double-shot injection mold and an injection molding method; comprising an upper mold base, a lower mold base and a first row position, the upper mold core of the upper mold base, the lower mold core of the lower mold base and the first row position can enclose a first shot cavity or a second shot cavity; the first row position is installed with a shunt pipe for up and down movement, the upper mold base is provided with a first shot injection port and a second shot injection port corresponding to the first shot cavity and the second shot cavity, and when the first row position moves along a first direction, it can act on the shunt pipe to move up and down to conduct and connect the first shot cavity with the first shot injection port or conduct and connect the second shot cavity with the second shot injection port. Compared with the prior art, the outer soft rubber layer and the inner hard rubber layer can be injection molded in the same set of molds, and the problem of the outer soft rubber layer being separated from the movable mold due to the rotation of the movable mold in the traditional technology can be avoided, and the overall appearance of the automobile interior covering will not change, thereby improving the molding reliability and molding yield of the automobile interior covering.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a same-cavity double-shot injection mold and an injection molding method. Background Art

[0002] In the field of molds, injection molds not only have a wide variety of products and are easy to mass produce, but many of them are closely related to life. In the injection mold industry, double-shot injection molds, as a unique injection molding method, can complete some special-purpose products that require different colors or different materials to meet some special needs.

[0003] In the current automotive field, automotive interior covering parts usually include an outer soft rubber layer and an inner hard rubber layer. The inner hard rubber layer is usually used for snapping and assembly with other covering parts, and the outer soft rubber layer is usually used for user touch layer. Therefore, when injection molding automotive interior covering parts, a double-shot injection mold is required. During injection molding, the fixed mold and the movable mold of the first shot injection mold are combined to form the outer soft rubber layer; then the movable mold containing the outer soft rubber layer in the first shot injection mold is transferred to the second shot injection mold and combined with the fixed mold of the second shot injection mold to injection mold the inner hard rubber layer.

[0004] However, the inventors discovered in actual production operations that after the fixed mold and the movable mold of the first injection mold are opened, the temperature will drop, which will cause the outer soft rubber layer attached to the movable mold of the first injection mold to cool down; in the process of transferring the movable mold of the first injection mold and closing it with the fixed mold of the second injection mold, the outer soft rubber layer will partially separate from the movable mold of the first injection mold due to cooling and insufficient supporting force, resulting in the outer soft rubber layer being unable to completely adhere to the movable mold of the first injection mold; once the outer soft rubber layer cannot be completely adhered to the hard rubber layer of the first injection mold, the outer soft rubber layer will be deformed. In this case, after the second injection molding of the inner hard rubber layer is performed, the overall shape of the interior covering will change, resulting in the injection molded interior covering being a non-conforming part, which seriously limits the reliability and molding yield of injection molding.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the invention

[0006] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a same-cavity double-shot injection mold, which effectively solves the technical defects of the prior art, namely, low injection molding reliability and low molding yield of the double-shot injection mold used for injection molding of automobile interior covering parts.

[0007] To achieve the above object, the present invention adopts the following technical solution: a same-cavity double-shot injection mold, comprising an upper mold base and a lower mold base movably mounted on the bottom of the upper mold base, an upper mold core is fixedly mounted on the bottom of the upper mold base, and a lower mold core is fixedly mounted on the top of the lower mold base;

[0008] The lower mold base is movably mounted with a first slide along a first direction. When the upper mold base moves downward relative to the lower mold base, the first slide can be pushed to move along the first direction, so that the upper mold core, the lower mold core and the first slide surround a first injection cavity for molding the outer soft rubber layer and a second injection cavity for molding the inner hard rubber layer.

[0009] The first row position is installed with a shunt pipe for up and down movement, and the upper mold base is configured with a first injection port and a second injection port corresponding to the first injection cavity and the second injection cavity. When the first row position moves along the first direction, it can act to move the shunt pipe up and down to connect the first injection cavity with the first injection port or connect the second injection cavity with the second injection port.

[0010] The beneficial effect of the same-cavity double-shot injection mold provided by the present application is that: compared with the prior art, when performing injection molding of an automobile interior covering part, the upper mold base is moved downward relative to the lower mold base, and the first row is pushed to move along the first direction, so that the upper mold core, the lower mold core and the first row surround the first shot cavity or the second shot cavity; such a structure can injection mold the outer soft rubber layer and the inner hard rubber layer in the same set of molds, effectively avoiding the problem of the outer soft rubber layer being separated from the movable mold due to the rotation of the movable mold in the traditional technology, thereby ensuring that after the second shot injection molding of the inner hard plastic layer is performed, the overall appearance of the automobile interior covering part will not change, thereby improving the molding reliability and molding yield of the automobile interior covering part;

[0011] At the same time, a shunt pipe that can move up and down is set on the first row position. When the first row position moves to surround the first shot cavity or the second shot cavity, it can act on the shunt pipe to move up and down to switch the first shot injection port and the first shot cavity to be connected or the second shot injection port and the second shot cavity to be connected. With this structure, different types of hot melt slurries are injected into the first shot cavity and the second shot cavity respectively, and the two different types of hot melt slurries will not mix, thereby further improving the reliability and molding yield of injection molding.

[0012] As a preferred solution: a first pressing block is installed at the bottom of the upper die seat, and a first inclined surface is provided on a side of the first pressing block facing the first row;

[0013] A second inclined surface is provided on a side surface of the first slide facing the first lower pressing block. When the upper mold base moves downward relative to the lower mold base, the first inclined surface can abut against the second inclined surface and cause the first slide to move along the first direction to enclose the first injection cavity or the second injection cavity.

[0014] As a preferred solution: a first limiting groove with an opening facing downward is provided at the bottom of the upper die base, the first limiting groove is extended along the moving direction of the first row position, and the top of the shunt pipe can be movably inserted into the first limiting groove;

[0015] The first injection glue inlet is provided with a first glue inlet flow channel penetrating through the top of the first limiting groove, and the second injection glue inlet is provided with a second glue inlet flow channel penetrating through the top of the first limiting groove.

[0016] As a preferred solution: a stepped surface is provided on the top of the first limiting groove, the stepped surface includes at least a first plane and a second plane, the first plane is lower than the second plane; the first glue feed channel runs through the first plane, and the second glue feed channel runs through the second plane;

[0017] The shunt tube is provided with a shunt channel, which runs through the top of the shunt tube; when the shunt tube abuts against the first plane, the first glue inlet channel is connected to the shunt channel; when the shunt tube abuts against the second plane, the second glue inlet channel is connected to the shunt channel.

[0018] As a preferred solution: a first through hole and a second through hole are provided on the side of the shunt pipe, the first through hole and the second through hole both penetrate the outer side of the shunt pipe and are connected to the shunt channel, and the first through hole and the second through hole are arranged at a vertical distance;

[0019] The first row is provided with a first branch flow channel and a second branch flow channel, and the first branch flow channel and the second branch flow channel are located at the same level;

[0020] When the shunt tube abuts against the first plane, the first through hole is conductively connected to the first branch channel and closes the second through hole; when the shunt tube abuts against the second plane, the second through hole is conductively connected to the second branch channel and closes the first through hole.

[0021] As a preferred solution: the first row is provided with a first limiting hole penetrating the upper and lower surfaces thereof, and the shunt pipe can be installed in the first limiting hole in an upward and downward movable manner;

[0022] When the shunt pipe moves up and down, the first through hole and the second through hole can be closed by the wall surface of the first limiting hole.

[0023] As a preferred solution: the first limiting groove further includes a third plane, the third plane is located between the first plane and the second plane, the third plane is higher than the first plane and lower than the second plane;

[0024] The upper mold seat is provided with a first glue clearing port, the first glue clearing port is provided with a first glue clearing flow channel, and the first glue clearing flow channel runs through the third plane.

[0025] As a preferred solution: the shunt channel runs downward through the bottom of the shunt pipe, a first control valve is installed at the bottom of the shunt pipe, and the first control valve is connected to the gas generating device through a pipeline;

[0026] When the shunt pipe abuts against the third plane and the shunt channel is connected to the first clear glue flow channel, the first control valve controls the gas generating device to be connected to the shunt channel to blow gas into the shunt channel.

[0027] As a preferred solution: a telescopic rod is installed at the bottom of the first control valve, the other end of the telescopic rod is connected to a support plate, a spring is installed between the first control valve and the support plate, and the support plate is movably installed on the lower mold base.

[0028] The present application also provides an injection molding method of a same-cavity double-shot injection mold, comprising installing the above-mentioned same-cavity double-shot injection mold on an injection molding machine; the injection molding method comprises

[0029] Step 1, the downward pressure device of the injection molding machine drives the upper mold base to move downward relative to the lower mold base, so that the first downward pressure block pushes the first row to move rightward along the first direction, and the first row, the upper mold core and the lower mold core are molded and surround the first injection cavity; the first row moves rightward along the first direction and synchronously pushes the top of the diverter pipe to move and abut against the first plane, so that the first glue inlet flow channel is connected with the diverter channel, and the diverter pipe moves downward to connect the first through hole with the first branch flow channel and close the second branch flow channel;

[0030] Step 2, the injection molding machine starts to inject the first hot melt slurry, the first hot melt slurry is injected through the first glue inlet, and flows through the first glue inlet flow channel, the diversion channel, the first through hole, the first branch flow channel and is injected into the first injection cavity, and after the first hot melt slurry is cooled, the outer soft rubber layer is formed in the first injection cavity;

[0031] Step 3, the pressing device of the injection molding machine drives the upper mold base to move up a first distance relative to the lower mold base, and at the same time, the first row moves leftward along the first direction and acts on the top of the shunt pipe to abut against the third plane, so that the first clear glue flow channel is connected with the shunt channel, and the shunt pipe moves up to close the first branch flow channel and the second branch flow channel;

[0032] Step 4, starting the external gas generating device, and controlling the gas generating device to be connected to the diversion channel through the first control valve, so that the first hot melt slurry remaining in the diversion channel is discharged from the first clear glue flow channel and the first clear glue port through the gas generating device;

[0033] Step 5, the downward pressure device of the injection molding machine drives the upper mold base to move up a second distance relative to the lower mold base, so that the first row moves leftward along the first direction, and the first row, the upper mold core, the lower mold core and the inner side of the outer soft rubber layer surround the second injection cavity; the first row moves leftward along the first direction and synchronously pushes the top of the shunt pipe to move and abut against the second plane, so that the second glue feed channel is connected with the shunt channel, and the shunt pipe moves up to connect the second through hole to the second branch channel and close the first branch channel; at the same time, the first control valve cuts off the connection between the shunt channel and the gas generating device;

[0034] Step 6, the injection molding machine starts to inject the second hot melt slurry, the second hot melt slurry is injected through the second glue inlet, and flows through the second glue inlet flow channel, the diversion channel, the second through hole, the second branch flow channel and is injected into the second cavity, and after the second hot melt slurry is cooled, an inner hard glue layer is formed in the second injection cavity;

[0035] Step 7: The pressing device of the injection molding machine drives the upper mold base to move the mold away from the lower mold base.

[0036] The beneficial effect of the injection molding method of the same-cavity double-shot injection mold provided in the present application is that: compared with the prior art, a diverter tube that can be moved up and down is arranged on the first row position, and when the first row position moves to surround the first shot cavity or the second shot cavity, it can act to move the diverter tube up and down to switch the first shot injection port and the first shot cavity to be connected or the second shot injection port and the second shot cavity to be connected; with such a structure, different types of hot melt slurries are injected into the first shot cavity and the second shot cavity respectively, and the two different types of hot melt slurries will not be mixed, thereby further improving the reliability and molding yield of injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of the same-cavity double-shot injection mold provided in an embodiment of the present application;

[0039] Figure 2 yes Figure 1 The schematic diagram of the partial three-dimensional structure of the same-cavity double-shot injection mold shown;

[0040] Figure 3 yes Figure 1 The schematic diagram of the full cross-section structure of the first shot cavity of the same-cavity double-shot injection mold shown in FIG.

[0041] Figure 4 yes Figure 3 The enlarged partial view of point A of the same-cavity double-shot injection mold shown;

[0042] Figure 5 yes Figure 4 A partial enlarged view of the second shot cavity in the same-cavity double-shot injection mold shown;

[0043] Figure 6 yes Figure 3 The enlarged view of the B part of the same-cavity double-shot injection mold shown;

[0044] Figure 7 yes Figure 3 The schematic diagram of the distance structure of the manifold of the same-cavity double-shot injection mold is shown;

[0045] Figure 8 yes Figure 2 A cross-sectional view of the first row of the same-cavity double-shot injection mold in the horizontal plane direction;

[0046] Fig. 9 yes Figure 8 A partial enlarged view of the A portion where the flow divider moves relative to the first row position to connect the first through hole with the first branch flow channel and close the second branch flow channel;

[0047] Fig.10 yes Figure 8 The illustrated partial enlarged view of the A portion where the flow dividing tube moves relative to the first row position to connect the second through hole with the second branch flow channel and close the first branch flow channel;

[0048] Fig.11 yes Figure 2 A top view of a same-cavity double-shot injection mold is shown;

[0049] Fig.12 yes Fig.11 The cross-sectional view at AA of the same-cavity double-shot injection mold shown;

[0050] Fig.13 yes Fig.12 The cross-sectional view at BB of the same-cavity double-shot injection mold shown;

[0051] Fig.14 yes Figure 1 The three-dimensional structure schematic diagram of the automobile interior covering part injection molded by the same-cavity double-shot injection mold is shown.

[0052] Among them, the reference numerals in the figure are:

[0053] 10. Same-cavity double-shot injection mold; 11. Upper mold base; 111. Upper mold core; 112. First lower pressing block; 113. First inclined surface; 114. First limiting groove; 1141. First plane; 1142. Second plane; 1143. Third plane; 1144. Guide inclined surface; 12. Lower mold base; 121. Lower mold core; 122. First hollow portion; 123. Dovetail guide rail; 124. Elastic component; 13. First row position; 131. Second inclined surface; 132. First branch flow channel; 133. Second branch flow channel; 134. First limiting hole; 135. Dovetail guide groove; 136. First push block; 137, first execution cylinder; 14, first shot cavity; 15, second shot cavity; 16, shunt pipe; 161, shunt channel; 162, first through hole; 163, second through hole; 164, first control valve; 1641, valve body; 1642, valve plate; 1643, drive cylinder; 1644, first valve port; 1645, second valve port; 165, telescopic rod; 166, support plate; 167, spring; 17, first shot glue inlet; 171, first glue inlet flow channel; 18, second shot glue inlet; 181, second glue inlet flow channel; 19, first glue cleaning inlet; 191, first glue cleaning flow channel;

[0054] 100. Automobile interior covering parts; 1001. Outer soft rubber layer; 1002. Inner hard rubber layer;

[0055] x1, first direction. DETAILED DESCRIPTION

[0056] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0057] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0058] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0061] Please also read Figures 1 to 14 Now, the same-cavity double-shot injection mold 10 provided in the embodiment of the present application is described. The same-cavity double-shot injection mold 10 comprises: an upper mold base 11, a lower mold base 12 and a first row 13.

[0062] The lower die base 12 is movably mounted on the bottom of the upper die base 11, which can also be understood as the upper die base 11 being movably mounted on the top of the lower die base 12; an upper die core 111 is fixedly mounted on the bottom of the upper die base 11, and a lower die core 121 is fixedly mounted on the top of the lower die base 12; the first row 13 is movably mounted on the lower die base 12 along the first direction x1, and when the upper die base 11 moves downward relative to the lower die base 12, the first row 13 can be pushed to move along the first direction x1, so that the upper die core 111, the lower die core 121 and the first row 13 are used to surround the structure The first injection cavity 14 for molding the outer soft rubber layer 1001 and the second injection cavity 15 for molding the inner hard rubber layer 1002; the first row 13 is equipped with a diverter pipe 16 that moves up and down, and the upper mold base 11 is configured with a first injection port 17 and a second injection port 18 corresponding to the first injection cavity 14 and the second injection cavity 15. When the first row 13 moves along the first direction x1, it can act to move the diverter pipe 16 up and down to connect the first injection cavity 14 with the first injection port 17 or to connect the second injection cavity 15 with the second injection port 18.

[0063] Specifically, when the automobile interior covering part 100 is injection molded, the upper mold base 11 moves downward relative to the lower mold base 12, and the first row 13 is pushed to move along the first direction x1, so that the upper mold core 111, the lower mold core 121 and the first row 13 surround the first injection cavity 14 or the second injection cavity 15; such a structure can be injection molded in the same set of molds. The problem of the outer soft rubber layer 1001 being separated from the movable mold due to the rotation of the movable mold in the traditional technology is effectively avoided, thereby ensuring that after the second injection molding of the inner hard plastic layer, the overall appearance of the automobile interior covering part 100 will not change, thereby improving the molding reliability and molding yield of the automobile interior covering part 100;

[0064] At the same time, a diverter pipe 16 that can move up and down is set on the first row position 13. When the first row position 13 moves to surround the first injection cavity 14 or the second injection cavity 15, it can act to move the diverter pipe 16 up and down to switch the first injection port 17 and the first injection cavity 14 to be connected or the second injection port 18 and the second injection cavity 15 to be connected. With this structure, different types of hot melt slurries are injected into the first injection cavity 14 and the second injection cavity 15 respectively, and the two different types of hot melt slurries will not mix, thereby further improving the reliability and molding yield of injection molding.

[0065] In some embodiments of the present application, a first lower pressing block 112 is installed at the bottom of the upper mold base 11, and a first inclined surface 113 is provided on a side of the first lower pressing block 112 facing the first row 13; a second inclined surface 131 is provided on a side of the first row 13 facing the first lower pressing block 112. When the upper mold base 11 moves downward relative to the lower mold base 12, the first inclined surface 113 can abut against the second inclined surface 131 and cause the first row 13 to move along the first direction x1 to enclose the first injection cavity 14 or the second injection cavity 15.

[0066] Specifically, the lower mold base 12 is provided with a first hollow portion 122, and the first row 13 can be installed in the first hollow portion 122 in a left-right displacement manner along the first direction x1. The first hollow portion 122 has dovetail guide rails 123 at the bottom and front and rear sides thereof, and the bottom of the first row 13 is adapted to the dovetail guide rails 123 and is provided with dovetail guide grooves 135. The dovetail guide rails 123 and the dovetail guide grooves 135 are arranged to limit the first row 13 to be able to move horizontally in the left-right direction along the first direction x1. An elastic component 124 is installed between the dovetail guide grooves 135 and the dovetail guide rails 123. After the first lower pressing block 112 stops acting on the first row 13, the elastic component 124 can provide elastic force to act on the first row 13 to move to the left.

[0067] Preferably, the elastic component 124 can be a spring, a spring sheet or elastic plastic, as long as the first row 13 can autonomously move leftward along the first direction x1 when the first pressing block 112 cancels the action on the first row 13 .

[0068] Furthermore, the first slide position 13 is movably installed with a first push block 136, and the first slide position 13 is installed with a first actuator cylinder 137, and the telescopic rod of the first actuator cylinder 137 is connected to the first push block 136; when the upper mold base 11 is moved away from the lower mold base 12, the telescopic rod of the first actuator cylinder 137 can be extended to push the first push block 136 to move toward the molding cavity to protrude the first slide position 13, thereby ejecting the automobile interior covering 100.

[0069] In other embodiments of the present application, a first limiting groove 114 with an opening facing downward is provided at the bottom of the upper mold base 11, and the first limiting groove 114 is extended along the moving direction of the first row position 13, and the top of the diversion tube 16 can be movably inserted into the first limiting groove 114; the first injection port 17 is provided with a first injection channel 171 passing through the top of the first limiting groove 114, and the second injection port 18 is provided with a second injection channel 181 passing through the top of the first limiting groove 114.

[0070] Specifically, a stepped surface is provided at the top of the first limiting groove 114, and the stepped surface includes at least a first plane 1141 and a second plane 1142, and the first plane 1141 is lower than the second plane 1142; the first glue feed channel 171 passes through the first plane 1141, and the second glue feed channel 181 passes through the second plane 1142; the diverter tube 16 is provided with a diverter channel 161, and the diverter channel 161 passes through the top of the diverter tube 16; when the diverter tube 16 abuts against the first plane 1141, the first glue feed channel 171 is conductively connected with the diverter channel 161; when the diverter tube 16 abuts against the second plane 1142, the second glue feed channel 181 is conductively connected with the diverter channel 161.

[0071] Preferably, a first through hole 162 and a second through hole 163 are provided on the side of the diverter tube 16, and the first through hole 162 and the second through hole 163 both penetrate the outer side surface of the diverter tube 16 and are connected to the diverter channel 161, and the first through hole 162 and the second through hole 163 are arranged at a vertical interval; the first row position 13 is provided with a first branch channel 132 and a second branch channel 133, and the first branch channel 132 and the second branch channel 133 are located at the same horizontal height; when the diverter tube 16 abuts against the first plane 1141, the first through hole 162 is connected to the first branch channel 132 and closes the second through hole 163; when the diverter tube 16 abuts against the second plane 1142, the second through hole 163 is connected to the second branch channel 133 and closes the first through hole 162.

[0072] Furthermore, the first row position 13 is provided with a first limiting hole 134 penetrating its upper and lower surfaces, and the shunt tube 16 can be installed in the first limiting hole 134 in a movable manner up and down; when the shunt tube 16 moves up and down, the first through hole 162 and the second through hole 163 can be closed by the wall of the first limiting hole 134.

[0073] That is to say, when the first through hole 162 is conductively connected with the first branch flow channel 132, the second through hole 163 and the second branch flow channel 133 are arranged up and down, and the second through hole 163 is closed by the wall of the first limiting hole 134; when the second through hole 163 and the second branch flow channel 133 are conductively connected, the first through hole 162 and the first branch flow channel 132 are arranged up and down, and the first through hole 162 is closed by the wall of the first limiting hole 134.

[0074] In some other embodiments of the present application, the first limiting groove 114 also includes a third plane 1143, the third plane 1143 is located between the first plane 1141 and the second plane 1142, the third plane 1143 is higher than the first plane 1141 and lower than the second plane 1142; the upper mold base 11 is provided with a first glue clearing port 19, the first glue clearing port 19 is provided with a first glue clearing channel 191, and the first glue clearing channel 191 runs through the third plane 1143.

[0075] Specifically, the diverter channel 161 runs downward through the bottom of the diverter tube 16, and a first control valve 164 is installed at the bottom of the diverter tube 16. The first control valve 164 is connected to a gas generating device through a pipeline; when the diverter tube 16 abuts against the third plane 1143 and the diverter channel 161 is connected to the first clear glue flow channel 191, the first control valve 164 controls the gas generating device to be connected to the diverter channel 161 to blow gas into the diverter channel 161.

[0076] Preferably, the first control valve 164 is a gate valve, which includes a valve body 1641, a valve plate 1642 movably mounted on the valve body 1641, and a driving cylinder 1643 for driving the raft to move. The valve body 1641 has at least a first valve port 1644 and a second valve port 1645, the first valve port 1644 is connected to the shunt channel 161, and the second valve port 1645 is connected to the external gas generating device through a pipeline; when blowing, the valve plate 1642 can be driven to move by the driving cylinder 1643 so that the first valve port 1644 is connected to the second valve port 1645, and the air flow can be blown from the second valve port 1645 from the first valve port 1644 into the shunt channel 161.

[0077] Furthermore, a telescopic rod 165 is installed at the bottom of the first control valve 164, and the other end of the telescopic rod 165 is connected to a support plate 166. A spring 167 is installed between the first control valve 164 and the first support plate 166, and the support plate 166 is movably installed on the lower mold base 12; such a structure can improve the reliability and smoothness of the first row position 13 acting on the diverter pipe 16 when it moves along the first direction x1 and moves up and down, and prevent the first row position 13 and the diverter pipe 16 from getting stuck.

[0078] Preferably, the lower die base 12 is provided with guide grooves into which both ends of the support plate 166 can be movably inserted.

[0079] In more detail, after the first row 13 moves rightward along the first direction x1 to a position, the mold can be closed and the first injection cavity 14 can be formed. Then, the first row 13 moves leftward along the first direction x1 to form the second injection cavity 15 . Therefore, the second glue injection port 18, the first glue clearing port 19 and the first glue injection port 17 are arranged in sequence from left to right along the first direction x1; accordingly, the second plane 1142, the third plane 1143 and the first plane 1141 are arranged in sequence from left to right, and a guide slope 1144 is provided between the second plane 1142 and the third plane 1143, and a guide slope 1144 is provided between the third plane 1143 and the first plane 1141, so that when the shunt tube 16 switches from the second plane 1142 to abutting against the third plane 1143, the guide slope 1144 is used for guidance, and when the shunt tube 16 switches from the third plane 1143 to abutting against the first plane 1141, the guide slope 1144 is used for guidance.

[0080] In addition, the first glue clearing port 19 can be connected to a pipeline, and a control valve is set at the other end of the pipeline. The first pipeline and the second pipeline are connected through the control valve, so that when cleaning the first hot melt slurry, the control valve is used to control the first hot melt slurry to be discharged from the first pipeline; when cleaning the second hot melt slurry, the control valve is used to control the second hot melt slurry to be discharged from the second pipeline.

[0081] In order to prevent the hot melt slurry from hardening during the glue cleaning operation, a heating tube (not shown in the figure) is arranged on the first row 13 and the upper mold base 11. The heating tube needs to be set close to one side of the diverter tube 16 to heat the hot melt slurry to be cleaned to prevent it from hardening and thus affecting the glue cleaning effect.

[0082] Next, the injection molding method of the same-cavity double-shot injection mold 10 of the automotive interior cover 100 provided in the present application is described in detail. The same-cavity double-shot injection mold 10 of the automotive interior cover 100 is installed in an injection molding machine, and the injection molding machine drives the upper mold base 11 to move relative to the lower mold base 12 to open or close the mold, and at the same time, the injection molding machine controls the input of the first hot melt slurry and the second hot melt slurry; the specific injection molding method includes

[0083] Step 1, the pressing device of the injection molding machine drives the upper mold base 11 to move downward relative to the lower mold base 12, so that the first pressing block 112 pushes the first row 13 to move rightward along the first direction x1, and the first row 13, the upper mold core 111 and the lower mold core 121 are molded together and surround the first injection cavity 14; the first row 13 moves rightward along the first direction x1 synchronously to push the top of the diverter pipe 16 to move and abut against the first plane 1141, so that the first glue inlet flow channel 171 is connected with the diverter channel 161, and the diverter pipe 16 moves downward to connect the first through hole 162 with the first branch flow channel 132 and close the second branch flow channel 133;

[0084] Step 2, the injection molding machine starts to inject the first hot melt slurry, the first hot melt slurry is injected through the first glue inlet, and flows through the first glue inlet channel 171, the branch channel 161, the first through hole 162, and the first branch channel 132 into the first injection cavity 14, and after the first hot melt slurry is cooled, the outer soft rubber layer 1001 is formed in the first injection cavity 14;

[0085] Step 3, the pressing device of the injection molding machine drives the upper mold base 11 to move up a first distance relative to the lower mold base 12, and at the same time, the first row 13 moves leftward along the first direction x1 and acts on the top of the shunt pipe 16 to abut against the third plane 1143, so that the first clear glue flow channel 191 is connected with the shunt channel 161, and the shunt pipe 16 moves up to close the first branch flow channel 132 and the second branch flow channel 133;

[0086] Step 4, start the external gas generating device, and control the gas generating device to be connected to the bypass channel 161 through the first control valve 164, so that the first hot melt slurry remaining in the bypass channel 161 is discharged from the first clear glue flow channel 191 and the first clear glue port 19 through the gas generating device;

[0087] Step 5, the pressing device of the injection molding machine drives the upper mold base 11 to move up a second distance relative to the lower mold base 12, so that the first row 13 moves leftward along the first direction x1, and the first row 13, the upper mold core 111, the lower mold core 121 and the inner side of the outer soft rubber layer 1001 surround the second injection cavity 15; the first row 13 moves leftward along the first direction x1 and simultaneously pushes the top of the shunt pipe 16 to move and abut against the second plane 1142, so that the second glue inlet flow channel 181 is connected with the shunt channel 161, and the shunt pipe 16 moves up to connect the second through hole 163 to the second branch flow channel 133 and close the first branch flow channel 132; at the same time, the first control valve 164 cuts off the connection between the shunt channel 161 and the gas generating device;

[0088] Step 6, the injection molding machine starts to inject the second hot melt slurry, the second hot melt slurry is injected through the second glue inlet, and flows through the second glue inlet channel 181, the branch channel 161, the second through hole 163, and the second branch channel 133 into the second cavity, and after the second hot melt slurry is cooled, the inner hard rubber layer 1002 is formed in the second injection cavity 15;

[0089] Step 7: The pressing device of the injection molding machine drives the upper mold base 11 to move the mold away from the lower mold base 12.

[0090] It should be noted here that after the mold is opened and the automobile interior cover 100 is ejected in step 7, the upper mold base 11 needs to be moved to the right a certain distance along the first direction x1 so that the top of the diverter tube 16 is against the third plane 1143, and the diverter channel 161 is connected to the first clear glue channel 191. At the same time, the heating tube is started to heat the first row 13 and the upper mold base 11 to melt the second hot melt slurry; and the first control valve 164 is controlled again to connect the gas generating device and the diverter channel 161, and the second hot melt slurry remaining in the diverter tube 16 is removed by gas.

[0091] Specifically, the first distance that the upper mold base 11 moves upward relative to the lower mold base 12 refers to the moving distance that the top of the shunt tube 16 switches from abutting the first plane 1141 to abutting the third plane 1143, and the first distance is between 1.5 mm and 3 mm; the second distance that the upper mold base 11 moves upward relative to the lower mold base 12 is the distance that the upper mold base 11 continues to move upward on the basis of moving the first distance relative to the lower mold base 12, and refers to the moving distance that the shunt tube 16 switches from abutting the third plane 1143 to abutting the second plane 1142, and the second distance The distance is between 1.5mm and 3mm. The specific setting parameters of the first distance and the second distance need to be determined according to the distance between the upper and lower spacings of the first through hole 162 and the second through hole 163. It is necessary to ensure that after the first through hole 162 is connected with the first branch channel 132, the second through hole 163 can be closed; at the same time, after the top of the shunt tube 16 abuts against the third plane 1143, the first through hole 162 and the second through hole 163 can be closed at the same time; after the second through hole 163 is connected with the second branch channel 133, the first through hole 162 can be closed.

[0092] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A same-cavity double-shot injection mold, comprising an upper mold base and a lower mold base movably mounted on the bottom of the upper mold base, an upper mold core is fixedly mounted on the bottom of the upper mold base, and a lower mold core is fixedly mounted on the top of the lower mold base; Features: The lower mold base is movably mounted with a first slide along a first direction (x1), and when the upper mold base moves downward relative to the lower mold base, the first slide can be pushed to move along the first direction (x1), so that the upper mold core, the lower mold core and the first slide surround a first injection cavity for molding an outer soft rubber layer and a second injection cavity for molding an inner hard rubber layer; The first position is provided with a shunt pipe that moves up and down, and the upper mold base is provided with a first injection port and a second injection port corresponding to the first injection cavity and the second injection cavity. When the first position moves along the first direction (x1), the shunt pipe can be moved up and down to conduct and connect the first injection cavity with the first injection port or conduct and connect the second injection cavity with the second injection port. A first limiting groove with an opening facing downward is provided at the bottom of the upper die seat, and the first limiting groove is extended along the moving direction of the first row position, and the top of the shunt pipe can be movably inserted into the first limiting groove; The first injection port is provided with a first injection flow channel that passes through the top of the first limiting groove, and the second injection port is provided with a second injection flow channel that passes through the top of the first limiting groove; The top of the first limiting groove is provided with a stepped surface, the stepped surface includes at least a first plane and a second plane, the first plane is lower than the second plane; the first glue feed channel runs through the first plane, and the second glue feed channel runs through the second plane; The diverter tube is provided with a diverter channel, which runs through the top of the diverter tube; when the diverter tube abuts against the first plane, the first glue inlet channel is connected to the diverter channel; when the diverter tube abuts against the second plane, the second glue inlet channel is connected to the diverter channel.

2. The same-cavity double-shot injection mold according to claim 1, characterized in that: A first pressing block is installed at the bottom of the upper die seat, and a first inclined surface is provided on a side of the first pressing block facing the first row; A second inclined surface is provided on a side surface of the first row facing the first lower pressing block. When the upper mold base moves downward relative to the lower mold base, the first inclined surface can abut against the second inclined surface and cause the first row to move along the first direction (x1) to enclose the first injection cavity or the second injection cavity.

3. The same-cavity double-shot injection mold according to claim 1 or 2, characterized in that: The side of the shunt pipe is provided with a first through hole and a second through hole, both of which penetrate the outer side of the shunt pipe and are connected to the shunt channel, and the first through hole and the second through hole are arranged at a vertical distance; The first row is provided with a first branch channel and a second branch channel, and the first branch channel and the second branch channel are located at the same level; When the shunt tube abuts against the first plane, the first through hole is conductively connected to the first branch channel and closes the second through hole; when the shunt tube abuts against the second plane, the second through hole is conductively connected to the second branch channel and closes the first through hole.

4. The same-cavity double-shot injection mold according to claim 3, characterized in that: The first row is provided with a first limiting hole penetrating through the upper and lower surfaces thereof, and the shunt pipe can be installed in the first limiting hole in an upward and downward movable manner; When the shunt pipe moves up and down, the first through hole and the second through hole can be closed by the wall surface of the first limiting hole.

5. The same-cavity double-shot injection mold according to claim 4, characterized in that: The first limiting groove also includes a third plane, the third plane is located between the first plane and the second plane, the third plane is higher than the first plane and lower than the second plane; The upper mold seat is provided with a first glue clearing port, the first glue clearing port is provided with a first glue clearing flow channel, and the first glue clearing flow channel runs through the third plane.

6. The same-cavity double-shot injection mold according to claim 5, characterized in that: The shunt channel runs downward through the bottom of the shunt pipe, a first control valve is installed at the bottom of the shunt pipe, and the first control valve is connected to the gas generating device through a pipeline; When the shunt pipe abuts against the third plane and the shunt channel is connected to the first clear glue flow channel, the first control valve controls the gas generating device to be connected to the shunt channel to blow gas into the shunt channel.

7. The same-cavity double-shot injection mold according to claim 6, characterized in that: A telescopic rod is installed at the bottom of the first control valve, the other end of the telescopic rod is connected to a support plate, a spring is installed between the first control valve and the support plate, and the support plate is movably installed on the lower mold base.

8. An injection molding method of a same-cavity double-shot injection mold as claimed in claim 7, characterized in that: The injection molding method comprises Step 1, the same-cavity double-shot injection mold is installed on an injection molding machine, and the downward pressure device of the injection molding machine drives the upper mold base to move downward relative to the lower mold base, so that the first downward pressure block pushes the first row to move right along the first direction (x1), and the first row, the upper mold core and the lower mold core are molded together to form a first shot cavity; The first row moves rightward along the first direction (x1) to synchronously push the top of the shunt pipe to move and abut against the first plane, so that the first glue inlet flow channel is connected with the shunt channel, and the shunt pipe moves downward to connect the first through hole with the first branch flow channel and close the second branch flow channel; Step 2, the injection molding machine starts to inject the first hot melt slurry, the first hot melt slurry is injected through the first glue inlet, and flows through the first glue inlet flow channel, the diversion channel, the first through hole, the first branch flow channel and is injected into the first injection cavity, and after the first hot melt slurry is cooled, the outer soft rubber layer is formed in the first injection cavity; Step 3, the pressing device of the injection molding machine drives the upper mold base to move up a first distance relative to the lower mold base, and at the same time, the first row moves leftward along the first direction (x1) and acts on the top of the shunt pipe to abut against the third plane, so that the first clear glue flow channel is connected with the shunt channel, and the shunt pipe moves up to close the first branch flow channel and the second branch flow channel; Step 4, starting the external gas generating device, and controlling the gas generating device to be connected to the diversion channel through the first control valve, so that the first hot melt slurry remaining in the diversion channel is discharged from the first clear glue flow channel and the first clear glue port through the gas generating device; Step 5, the downward pressure device of the injection molding machine drives the upper mold base to move up a second distance relative to the lower mold base, so that the first row moves leftward along the first direction (x1), and the first row, the upper mold core, the lower mold core and the inner side of the outer soft rubber layer surround the second injection cavity; the first row moves leftward along the first direction (x1) and simultaneously pushes the top of the shunt pipe to move and abut against the second plane, so that the second glue feed channel is connected with the shunt channel, and the shunt pipe moves up to connect the second through hole to the second branch channel and close the first branch channel; at the same time, the first control valve cuts off the connection between the shunt channel and the gas generating device; Step 6, the injection molding machine starts to inject the second hot melt slurry, the second hot melt slurry is injected through the second glue inlet, and flows through the second glue inlet flow channel, the diversion channel, the second through hole, the second branch flow channel and is injected into the second cavity, and after the second hot melt slurry is cooled, an inner hard glue layer is formed in the second injection cavity; Step 7: The pressing device of the injection molding machine drives the upper mold base to move the mold away from the lower mold base.

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