Injection mold for multi-insert housings

Abstract

The present invention relates to an injection mold for a multi-insert housing, the injection mold comprising a fixed mold device and a movable mold device. The fixed mold device comprises a fixed mold seat, an injection assembly and a fixed mold core, the injection assembly comprises a manifold, at least two injection head mechanisms and a heating mechanism, the manifold is provided with a main injection flow channel and a plurality of branch flow channels, each injection head mechanism is connected to a corresponding branch flow channel, the main injection flow channel is used to connect to the injection molding device, and the heating mechanism is used to heat the manifold. The movable mold device comprises a movable mold seat, a slider assembly, a clamping assembly and a movable mold core, the movable mold core and the fixed mold core are combined to form a molding cavity, the molding cavity comprises an inner ring space, an outer ring space, and a plurality of spoke spaces. The injection molding device injects hot melt into the main injection flow channel, the melt is injected into the inner ring space at multiple points along the branch flow channels and the corresponding injection head mechanisms, and then diffuses to fill the entire molding cavity, and the lateral inserts and the bottom inserts are correspondingly molded on the workpiece. The mold realizes multi-point joint injection and can quickly fill the entire molding cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, in particular to an injection mold, and more particularly to an injection mold of a multi-insert housing. Background Art

[0002] The car audio housing is made by injection molding. The car audio housing includes a circular inner ring, an outer ring, and multiple radial ribs connecting the inner ring and the outer ring in a radial shape. The inner ring and the outer ring have a height difference in the longitudinal direction. The car audio housing can be connected to the speaker assembly and the signal assembly. Accordingly, the bottom and side of the car audio housing are provided with conductive metal parts.

[0003] For example, Chinese public document CN108481688A discloses an injection mold for a car audio housing, which can realize sufficient sliding space for oblique side drawing and stable oblique core pulling under the premise of compact structure of the injection mold.

[0004] However, the side inserts and bottom inserts of the speaker housing are difficult to be processed simultaneously through the injection molding process. In particular, the bottom insert needs to be connected to the housing by adhesive bonding for separate installation, which increases the number of operation steps and causes unstable connection quality. In addition, the flow area of ​​the inner and outer rings of the speaker housing is large, and the mold is injected through one injection port, which requires high injection pressure and a long melt flow process, resulting in poor product molding effect and high scrap rate. Therefore, improvements are needed. Summary of the invention

[0005] In order to overcome the problems existing in the related art, an embodiment of the present invention provides an injection mold for a multi-insert housing.

[0006] According to a first aspect of an embodiment of the present invention, an injection mold of a multi-insert housing is provided, the injection mold comprising a fixed mold device and a movable mold device:

[0007] The fixed mold device includes a fixed mold seat, an injection assembly installed on the fixed mold seat and a fixed mold core, the injection assembly includes a manifold, at least two injection head mechanisms installed on the manifold, and a heating mechanism, the manifold is provided with a main injection flow channel and a plurality of branch flow channels branched from the main injection flow channel, each of the injection head mechanisms is connected to a corresponding branch flow channel, the main injection flow channel is used to be connected to the injection molding device, and the heating mechanism is used to heat the manifold;

[0008] The movable mold device includes a movable mold base, a slider assembly installed on the movable mold base, a clamping assembly and a movable mold core. The movable mold core and the fixed mold core are combined to form a molding cavity. The molding cavity includes an inner ring space, an outer ring space, and a plurality of spoke spaces connecting the inner ring space and the outer ring space. The slider assembly moves on one side of the outer ring space. The slider assembly is used to position the lateral insert. The clamping assembly is located at the bottom of the inner ring space. The clamping assembly is used to position the bottom insert. The injection head mechanism is connected to the inner ring space at intervals corresponding to each other.

[0009] The injection molding device injects hot melt into the main injection flow channel. The melt is injected into the inner circle space at multiple points along the branch flow channel and the corresponding injection head mechanism and then diffuses to fill the entire molding cavity. The side inserts and the bottom inserts are correspondingly molded on the workpiece.

[0010] In one embodiment, the fixed mold device includes a cooling circuit assembly arranged on the fixed mold core, the cooling circuit assembly includes an outer ring flow channel surrounding the outer circle space and an inner ring flow channel located in the area surrounding the inner circle space, the inner ring flow channel is provided with a plurality of spot cooling flow channels, the spot cooling flow channels extend toward the bottom insert, and the injection head mechanism is offset to avoid the inner ring flow channel.

[0011] In one embodiment, three injection head mechanisms are provided, and the output points of the three injection head mechanisms are located at the intersection of the inner circle space and the spoke space. At least three spot cooling runners are provided, and at least one spot cooling runner is distributed between two adjacent injection head mechanisms. The spot cooling runners and the injection head mechanisms are arranged in parallel.

[0012] In one embodiment, there is a height difference between the inner ring space and the outer ring space, the movable mold core protrudes toward the outer ring space to form an annular convex rib, the slider assembly is inserted into the outer ring space, and at least part of the lateral insert is inserted into the annular convex rib from the outer ring space.

[0013] In one embodiment, the slider assembly includes a sliding block and a molding seat detachably mounted on the sliding block, the molding seat is arranged to be plugged into the molding end of the movable mold core, the molding end is provided with an undulating molding boss and positioning holes distributed on both sides of the molding boss, and the two lateral inserts are respectively embedded and fixed in the positioning holes.

[0014] In one embodiment, the slider assembly includes a clamping member movably mounted on the shaping seat, at least a portion of the clamping member extends into the positioning hole, and the clamping member elastically abuts against the lateral insert.

[0015] In one embodiment, the clamping assembly includes a positioning protrusion fixed to the movable mold core, the bottom insert includes an insert body and an engaging portion distributed around the insert body, the engaging portion protrudes or is recessed from the peripheral wall of the insert body, and a mounting hole is provided in the middle of the insert body, and the mounting hole is snap-connected to the positioning protrusion.

[0016] In one embodiment, the fixed mold device includes a plurality of push assemblies installed on the fixed mold core, the push assemblies include a columnar portion and a push portion protruding from the columnar portion, a step surface is provided between the columnar portion and the push portion, and at least a portion of the engaging portion is located within the axial projection range of the step surface.

[0017] In one embodiment, the surfaces on both sides of the diverter plate are partially recessed to form an upper heating groove and a lower heating groove, the heating mechanism includes an upper heating element and a lower heating element, the upper heating element is embedded in the upper heating groove, the lower heating element is embedded in the lower heating groove, and the injection head mechanism is located in the area surrounded by the upper heating element and the lower heating element.

[0018] In one embodiment, the fixed mold device and the movable mold device are combined to form two symmetrically arranged molding cavities, and the diverter plate is provided with a plurality of symmetrically distributed branch channels, and the branch channels respectively perform synchronous injection to the two molding cavities through the injection head mechanism.

[0019] The technical solution provided by the embodiments of the present invention may include the following beneficial effects: the injection molding device injects the melt into the manifold, and then the injection head mechanism connected to the branch channel of the manifold injects the melt into the molding cavity from multiple angles, thereby realizing multi-point co-injection and being able to quickly fill the entire molding cavity, with a good molding effect. The heating mechanism controls the heating of the manifold to maintain the fluidity of the melt. The slider assembly slides laterally along the fixed mold seat to form the installation and positioning molding of the lateral insert. The bottom insert is located in the inner circle space and positioned to form the bottom insert fixation. Each insert is conveniently fixed and embedded in different molding positions and molding angles, with a good molding effect.

[0020] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 FIG. 4 is a schematic structural diagram of an injection mold according to an exemplary embodiment.

[0023] Figure 2is a schematic diagram showing an exploded structure of an injection mold according to an exemplary embodiment.

[0024] Figure 3 is a schematic diagram showing the layout of an injection assembly and a cooling circuit assembly according to an exemplary embodiment.

[0025] Figure 4 The figure is a schematic diagram showing a flow channel cross section of a manifold according to an exemplary embodiment.

[0026] Figure 5 is a schematic diagram showing an injection head mechanism corresponding to an injection molding cavity according to an exemplary embodiment.

[0027] Figure 6 is a schematic diagram showing a moving mold device according to an exemplary embodiment.

[0028] Figure 7 is a schematic diagram showing a slider assembly according to an exemplary embodiment.

[0029] In the figure, the fixed mold device 10; the fixed mold base 11; the heating chamber 111; the injection assembly 12; the manifold 121; the main injection flow channel 1211; the branch flow channel 1212; the upper heating groove 1213; the injection head mechanism 122; the heating mechanism 123; the upper heating element 1231; the lower heating element 1232; the fixed mold core 13; the heat insulation element 14; the cooling circuit assembly 15; the outer ring flow channel 151; the first flow channel 1511; the second flow channel 1512; the inner ring flow channel Channel 152; spot cooling runner 153; push assembly 16; molding block 17; movable mold device 20; movable mold seat 21; clamping assembly 22; movable mold core 23; annular rib 231; positioning convex block 232; slider assembly 24; sliding block 241; molding seat 242; positioning hole 243; molding boss 244; workpiece 30; lateral insert 31; bottom insert 32; molding cavity 40; inner circle space 41; outer circle space 42; spoke space 43. DETAILED DESCRIPTION

[0030] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figures 1 to 4 As shown, the present invention provides an injection mold for a multi-insert housing, the injection mold comprising a fixed mold device 10 and a movable mold device 20, the fixed mold device 10 and the movable mold device 20 are movable to close and open to process and remove a workpiece 30.

[0034] The fixed mold device 10 includes a fixed mold base 11, an injection assembly 12 installed on the fixed mold base 11, and a fixed mold core 13. The injection assembly 12 includes a diverter plate 121, at least two injection head mechanisms 122 installed on the diverter plate 121, and a heating mechanism 123. The diverter plate 121 is provided with a total injection flow channel 1211 and a plurality of branch flow channels 1212 branched from the total injection flow channel 1211, and each injection head mechanism 122 is connected to a corresponding branch flow channel 1212. The total injection flow channel 1211 is used to connect to the injection molding device, and the heating mechanism 123 is used to heat the diverter plate 121. The injection assembly 12 is detachably installed on the fixed mold base 11, and is used to adjust and change the injection mode and injection direction of the fluid melt, so as to perform multi-point injection molding according to different product form requirements, so as to improve the melt flow efficiency, injection efficiency and fluid flow reliability. The heating mechanism 123 controls the heating of the diverter plate 121, so as to maintain the fluidity of the melt in the diverter plate 121.

[0035] The movable mold device 20 includes a movable mold base 21, a slider assembly 24 installed on the movable mold base 21, a clamping assembly 22 and a movable mold core 23. The movable mold core 23 and the fixed mold core 13 are combined to form a molding cavity 40. The molding cavity 40 includes an inner circle space 41, an outer circle space 42, and a plurality of spoke spaces 43 connecting the inner circle space 41 and the outer circle space 42. The structure of the molding cavity 40 is adapted to the shape of the workpiece 30, wherein the inner circle space 41 and the outer circle space 42 are respectively set as annular spaces, and the spoke space 43 radially connects the inner circle space 41 and the outer circle space 42, thereby forming a molding space for the acoustic shell type workpiece 30.

[0036] The slider assembly 24 moves on one side of the outer ring space 42, and the slider assembly 24 is used to position the lateral insert 31. The slider assembly 24 slides along the side of the fixed mold seat 11 to form the installation and positioning molding of the lateral insert 31. The clamping assembly 22 is located at the bottom of the inner ring space 41, and the clamping assembly 22 is used to position the bottom insert 32. The bottom insert 32 is located in the inner ring space 41 and positioned to form the bottom insert 32 fixation. Each insert is convenient to fix and is embedded in different molding positions and molding angles, and the positioning effect is good.

[0037] Preferably, the injection head mechanism 122 is connected to the inner ring space 41 at intervals, and the melt diffuses and extends from the inner ring space 41 to the outer ring space 42, so as to quickly fill the entire molding cavity 40. Specifically, the melt enters the outer ring space 42 along the inner ring space 41 and the spoke space 43, so as to achieve rapid flow of the melt. Preferably, the injection head mechanism 122 includes an injection body and a heating unit surrounding the injection body, and the heating unit extends spirally along the injection body. The heating unit is used to heat the entire injection body to maintain the fluidity of the injected melt and improve the injection effect.

[0038] The main injection channel 1211 and multiple branch channels 1212 form a main-branch structure. The melt is injected from the injection molding device into the main injection channel 1211, and then flows from the main injection channel 1211 to each branch channel 1212, so as to keep the melt flowing from each branch channel 1212 into the injection head mechanism 122, and the injection end of the injection head mechanism 122 extends into the molding cavity 40. Multiple injection head mechanisms 122 inject the melt into the molding cavity 40 from multiple different positions, so as to achieve multi-point co-injection, and can quickly fill the entire molding cavity 40, with a good molding effect. Among them, the injection molding device injects hot melt into the main injection channel 1211, and the melt is injected into the inner circle space 41 at multiple points along the branch channel 1212 and the corresponding injection head mechanism 122, and then diffuses to fill the entire molding cavity 40, and the side insert 31 and the bottom insert 32 are correspondingly molded on the workpiece 30.

[0039] The heating mechanism 123 controls the heating of the manifold 121. The fluidity of the melt in the manifold 121 is an important technical condition for the injection of the multi-injection head mechanism 122. The manifold 121 is partially recessed on the two opposite sides to form an upper heating groove 1213 and a lower heating groove. The heating mechanism 123 includes an upper heating element 1231 and a lower heating element 1232. The upper heating element 1231 is embedded in the upper heating groove 1213, and the lower heating element 1232 is embedded in the lower heating groove. The injection head mechanism 122 is located in the area surrounded by the upper heating element 1231 and the lower heating element 1232. The manifold 121 is a metal block. The upper heating element 1231 and the lower heating element 1232 heat the manifold 121 from the upper and lower sides respectively, which can balance the heat of the manifold 121 as a whole, keep the melt in the main injection channel 1211 and each branch channel 1212 heated evenly, and have good fluidity.

[0040] Further preferably, the fixed mold base 11 is provided with a heating chamber 111, a heat insulating member 14 is installed in the heating chamber 111, and the diverter plate 121 is embedded and installed in the heat insulating member 14. The heat insulating member 14 covers the grooves where the upper heating member 1231 and the lower heating member 1232 are located, so that the upper heating member 1231 and the lower heating member 1232 can only heat the diverter plate 121, and have little effect on the temperature of other parts of the fixed mold base 11, thereby maintaining the cooling and molding of the melt in the molding cavity 40. Preferably, the heat insulating member 14 wraps the diverter plate 121, and the injection head mechanism 122 passes through the heat insulating member 14. Optionally, the heat insulating member 14 is made of a heat insulating material, such as the heat insulating member 14 is made of glass fiber, asbestos, rock wool, silicate, etc., or the heat insulating member 14 is made of aerogel felt, a vacuum plate, etc.

[0041] After the melt is injected into the molding cavity 40, the fixed mold device 10 and the movable mold device 20 need to cool the molding cavity 40 to promote the melt to cool and mold into the workpiece 30. In one embodiment, the fixed mold device 10 includes a cooling circuit assembly 15 disposed on the fixed mold core 13, and a cooling medium is passed through the cooling circuit assembly 15 to cool the fixed mold device 10 through which the cooling medium flows.

[0042] The cooling circuit assembly 15 includes an outer ring flow channel 151 surrounding the outer ring space 42 and an inner ring flow channel 152 located in the area surrounding the inner ring space 41. The inner ring flow channel 152 is provided with a plurality of spot cooling channels 153, which extend toward the bottom insert 32, and the injection head mechanism 122 is offset to avoid the inner ring flow channel 152. The outer ring flow channel 151 and the inner ring flow channel 152 cool the outer ring space 42 and the inner ring space 41 respectively, and the cooling direction and cooling area of ​​the outer ring space 42 and the inner ring space 41 are controllable.

[0043] Preferably, the outer ring runner 151 includes a first runner 1511 and a second runner 1512 symmetrically distributed outside the molding cavity 40, and the first runner 1511 and the second runner 1512 constitute an annular cooling space. On the projection plane, the outer ring space 42 is located within the projection range of the annular cooling space. In a preferred embodiment, the movable mold device 20 is provided with an inner ring runner 152 including a continuous inner runner and connecting runners connected to both ends of the inner runner, and the connecting runners intersect at two opposite sides of the fixed mold seat 11 respectively. On the projection plane, the inner runner is located within the projection range of the inner ring space 41, and a plurality of spot cooling runners 153 are provided in the vertical direction of the center line of the inner runner, and the spot cooling runners 153 intersect with the inner runner. The spot cooling runners 153 penetrate deep into the inner ring space 41 and are close to the molding cavity 40 to achieve central cooling. The inner ring runner 152 and the outer ring runner 151 cool the molding cavity 40 from the inner and outer sides respectively, thereby controlling the cooling direction of the melt, facilitating demolding and improving molding quality.

[0044] like Figures 3 to 5 As shown, in a preferred embodiment, three injection head mechanisms 122 are provided, and the three injection head mechanisms 122 are distributed in a triangle, thereby forming a three-point synchronous injection. There are four to six spoke spaces 43, preferably five. The three injection head mechanisms 122 correspond to the three spoke spaces 43 respectively. Specifically, the output points of the three injection head mechanisms 122 are located at the intersection of the inner circle space 41 and the spoke space 43. The melt can flow synchronously along the inner circle space 41 and the spoke space 43, and fill from the inner circle space 41 to the outer circle space 42 in multiple directions, so as to fill the mold quickly, with high filling efficiency and good balance. The synchronous injection molding of multiple injection head mechanisms 122 can also reduce the filling pressure, greatly shorten the filling time, and enable the inner circle space 41 and the outer circle space 42 to cool almost synchronously, with high molding quality.

[0045] Optionally, the five spoke spaces 43 are evenly distributed in a radial shape, the first injection head mechanism 122 corresponds to one spoke space 43, and the other two injection head mechanisms 122 are symmetrically distributed and separated from the first injection head mechanism 122 by one spoke space 43. The number of spoke spaces 43 is greater than the number of injection head mechanisms 122, so that part of the spoke spaces 43 form an exhaust channel structure, so that the inner circle space 41 is quickly exhausted and filled during the filling process, thereby improving the filling speed and improving the molding quality of the inner circle space 41.

[0046] Among them, at least three spot cooling channels 153 are provided, and at least one spot cooling channel 153 is distributed between two adjacent injection head mechanisms 122, and the spot cooling channel 153 and the injection head mechanism 122 are arranged in parallel. The spot cooling channel 153 and the injection head mechanism 122 are staggered, which can avoid interference with the injection head mechanism 122 and can provide directional cooling, thereby improving the molding effect. The spot cooling channel 153 is distributed between two adjacent injection head mechanisms 122, and the spot cooling channel 153 extends toward the inner circle space 41, thereby achieving directional cooling and a good cooling controllable area.

[0047] In one embodiment, there is a height difference between the inner circle space 41 and the outer circle space 42, and the recessed portion of the movable mold core 23 corresponds to the inner circle space 41 and the outer circle space 42 of the molding cavity 40, wherein the inner circle space 41 is recessed relative to the outer circle space 42, thereby having a gradient recessed space. The lateral insert 31 needs to be fixed by molding in the outer circle space 42 to form a lateral conductive connection. Among them, the slider assembly 24 is used to mold the power connector of the sound shell, wherein the lateral insert 31 is a metal part, one end of the lateral insert 31 is located on the outside of the inner circle of the sound shell for connecting the power cord, and the other end is located on the inside of the inner circle of the sound shell for connecting the speaker. In addition, there is a height difference between the inner circle space 41 and the outer circle space 42 to achieve pressure changes in the filling process and improve the filling effect.

[0048] like Figures 1 to 7 As shown, the inner ring of the acoustic housing is a thin-walled structure, wherein the movable mold core 23 protrudes toward the outer ring space 42 to form an annular convex rib 231, the slider assembly 24 is inserted into the outer ring space 42, and at least part of the lateral insert 31 is inserted into the annular convex rib 231 from the outer ring space 42. The boss structure formed by the annular convex rib 231 partially protruding from the outer ring space 42 is used to shape the outer ring of the workpiece 30. The slider assembly 24 slides along the movable mold seat 21, thereby sliding the lateral insert 31 to a specified position, and the slider assembly 24 positions the lateral insert 31 to achieve a tight fit. Among them, at least part of the lateral insert 31 is inserted into the annular convex rib 231, thereby preventing the inserted part of the lateral insert 31 from being contained by the melt. After the workpiece 30 is formed, the lateral insert 31 is located on the inner side of the inner ring and can be directly connected.

[0049] The slider assembly 24 includes a sliding block 241 and a molding seat 242 detachably mounted on the sliding block 241, and the molding seat 242 is fixed to the end of the sliding block 241. The sliding block 241 cooperates with the guide rod movement of the fixed mold device 10 to achieve linear reciprocating movement.

[0050] The molding seat 242 is provided to be plugged into the molding end of the movable mold core 23. The molding end is provided with an undulating molding boss 244 and positioning holes 243 distributed on both sides of the molding boss 244. Two lateral inserts 31 are respectively fixed in the positioning holes 243. The lateral insert 31 is inserted into the molding boss 244, so that part of the lateral insert 31 enters the annular convex rib 231. The part of the lateral insert 31 between the molding seat 242 and the annular convex rib 231 is located in the outer ring space 42, so that it can be contained by the melt to fix the lateral insert 31. Among them, the part of the lateral insert 31 plugged into the molding seat 242 and the part inserted into the annular convex rib 231 are not contained by the melt, can be directly conductively contacted, and form a lateral plug-in positioning. Among them, the end of the lateral insert 31 is jointly limited by the annular convex rib 231 and the fixed mold device 10 to avoid being covered by the melt. At the same time, the two ends of the lateral insert 31 are positioned by the molding seat 242 and the annular convex rib 231 respectively, and the positioning effect is good.

[0051] In order to prevent the lateral insert 31 from deviating during the melt filling process, the slider assembly 24 includes a clamping member movably mounted on the molding seat 242, at least part of the clamping member extends into the positioning hole 243, and the clamping member elastically abuts against the lateral insert 31. The clamping member movably clamps the lateral insert 31 located in the positioning hole 243, thereby improving the stability of the lateral insert 31. Optionally, the clamping member includes a spring piece mounted on the molding seat 242, at least part of the spring piece is bent and protrudes toward the positioning hole 243. The minimum distance between the spring piece and the hole wall of the positioning hole 243 is less than the wall thickness of the lateral insert 31, so as to form an elastic clamping. In addition, the elastic force of the spring piece is less than the insertion and extraction force of the lateral insert 31 after molding. Optionally, the clamping member includes a mounting seat plugged and assembled on the molding seat 242, an elastic member located in the mounting seat, and a top bead rotatably assembled on the mounting seat, and the top of the top bead extends into the positioning hole 243. The minimum distance between the top ball and the wall of the positioning hole 243 is smaller than the wall thickness of the lateral insert 31 to form an elastic snap connection.

[0052] The clamping assembly 22 clamps and fixes the bottom insert 32, and the bottom insert 32 can be easily installed on the movable mold device 20, and will not move in position and angle during the molding process. The bottom insert 32 includes an insert body and a fitting portion distributed around the insert body, the fitting portion protrudes or is recessed from the peripheral wall of the insert body, and a mounting hole is provided in the middle of the insert body. The bottom insert 32 is a metal part, and its fitting portion is used to match the plastic part of the sound housing to improve the bonding strength. Optionally, the fitting portion is a convex rib or boss protruding from the periphery of the insert body, and a step structure or a notch structure is formed between the fitting portion and the insert body to improve the bonding strength. Optionally, the fitting portion is a groove or notch recessed from the periphery of the insert body, and the notch can increase the bonding area between the bottom insert 32 and the injection molded part.

[0053] In one embodiment, the clamping assembly 22 includes a positioning protrusion 232 fixed to the movable mold core 23, and the positioning protrusion 232 is a columnar protrusion structure to position the center of the bottom insert 32. The mounting hole is connected to the positioning protrusion 232 by snapping to achieve center snapping. Preferably, the positioning protrusion 232 is provided with an arc-shaped groove to position the bottom insert 32 without affecting the demolding of the bottom insert 32. Further preferably, the fixed mold device 10 is provided with a push assembly 16, and the push assembly 16 cooperates with the positioning protrusion 232 to achieve circumferential and axial positioning of the bottom insert 32.

[0054] The fixed mold device 10 includes a plurality of push components 16 installed on the fixed mold core 13, and the push components 16 protrude toward the bottom insert 32, and position and position the bottom insert 32 when the mold is closed. Among them, the push component 16 includes a columnar portion and a push portion protruding from the columnar portion, and a step surface is provided between the columnar portion and the push portion, and at least part of the engaging portion is located within the axial projection range of the step surface. The columnar portion defines the upper surface of the bottom insert 32, and the push portion defines the peripheral wall edge of the bottom insert 32, thereby realizing the axial and circumferential positioning of the bottom insert 32. Preferably, four groups of push components 16 are provided, and the four groups of push components 16 are distributed in a rectangular shape. Preferably, the end of the push portion abuts against the movable mold core 23, thereby limiting the axial movable gap of the bottom insert 32. Preferably, the insert body is an octagonal structure, and the engaging portion is provided as four bosses spaced apart from the edge of the protruding insert body. After the workpiece 30 is formed, the four bosses and part of the engaging body are embedded in the plastic part of the workpiece 30.

[0055] In a preferred embodiment, the fixed mold device 10 includes a molding block 17 detachably mounted on the fixed mold base 11, and the molding block 17 is provided with a molding groove, the opening direction of the molding groove is the same as the mold closing direction, and the molding groove constitutes a local complex cavity structure.

[0056] On the basis of the above-mentioned embodiment, the fixed mold device 10 and the movable mold device 20 are combined to form two symmetrically arranged molding cavities 40, and the two molding cavities 40 can mold two workpieces 30 at the same time, and two workpieces 30 can be molded by one injection molding, and the processing efficiency is high. The manifold 121 is provided with a plurality of symmetrically distributed branch channels 1212, and the branch channels 1212 are respectively injected into the two molding cavities 40 synchronously through the injection head mechanism 122. The two molding cavities 40 and the injection head mechanism 122 are symmetrically arranged, which can realize the overall symmetrical thermal balance of the mold and the balanced flow of the melt.

[0057] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0058] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An injection mold for a multi-insert housing, the injection mold comprising a fixed mold device and a movable mold device, characterized in that: The fixed mold device includes a fixed mold seat, an injection assembly installed on the fixed mold seat and a fixed mold core, the injection assembly includes a manifold, at least two injection head mechanisms installed on the manifold, and a heating mechanism, the manifold is provided with a main injection flow channel and a plurality of branch flow channels branched from the main injection flow channel, each of the injection head mechanisms is connected to a corresponding branch flow channel, the main injection flow channel is used to be connected to the injection molding device, and the heating mechanism is used to heat the manifold; The movable mold device includes a movable mold base, a slider assembly installed on the movable mold base, a clamping assembly and a movable mold core. The movable mold core and the fixed mold core are combined to form a molding cavity. The molding cavity includes an inner ring space, an outer ring space, and a plurality of spoke spaces connecting the inner ring space and the outer ring space. The slider assembly moves on one side of the outer ring space. The slider assembly is used to position the lateral insert. The clamping assembly is located at the bottom of the inner ring space. The clamping assembly is used to position the bottom insert. The injection head mechanism is connected to the inner ring space at intervals corresponding to each other. The clamping assembly includes a positioning protrusion fixed to the movable mold core, the bottom insert includes an insert body and an engaging portion distributed around the insert body, the engaging portion protrudes or is recessed from the peripheral wall of the insert body, a mounting hole is provided in the middle of the insert body, and the mounting hole is snap-connected to the positioning protrusion; wherein the positioning protrusion is provided with an arc-shaped groove to position the bottom insert; The fixed mold device comprises a plurality of push components mounted on the fixed mold core, the push components comprising a column portion and a push portion protruding from the column portion, a step surface is provided between the column portion and the push portion, and at least part of the engaging portion is located within the axial projection range of the step surface; wherein the column portion defines the upper surface of the bottom insert, and the push portion defines the outer peripheral wall edge of the bottom insert, thereby realizing the axial and circumferential positioning of the bottom insert; the end of the push portion abuts against the movable mold core; The injection molding device injects hot melt into the main injection runner, and the melt is injected into the inner circle space at multiple points along the branch runner and the corresponding injection head mechanism and then diffuses to fill the entire molding cavity. The output point of the injection head mechanism is located at the intersection of the inner circle space and the spoke space. The number of the spoke spaces is greater than the number of the injection head mechanisms. The lateral inserts and the bottom inserts are correspondingly molded on the workpiece. The slider assembly includes a sliding block and a molding seat detachably mounted on the sliding block, the molding seat is arranged to be plugged into the molding end of the movable mold core, the molding end is provided with an undulating molding boss and positioning holes distributed on both sides of the molding boss, and the two lateral inserts are respectively embedded and fixed in the positioning holes; The slider assembly includes a clamping member movably mounted on the shaping seat, at least a portion of the clamping member extends into the positioning hole, and the clamping member elastically abuts against the lateral insert.

2. The injection mold for a multi-insert housing according to claim 1, characterized in that: The fixed mold device includes a cooling circuit assembly arranged on the fixed mold core, the cooling circuit assembly includes an outer ring flow channel surrounding the outer circle space and an inner ring flow channel located in the area surrounding the inner circle space, the inner ring flow channel is provided with a plurality of spot cooling flow channels, the spot cooling flow channels extend toward the bottom insert, and the injection head mechanism is offset to avoid the inner ring flow channel.

3. The injection mold for a multi-insert housing according to claim 2, characterized in that: There are three injection head mechanisms, at least three spot cooling channels, at least one spot cooling channel is distributed between two adjacent injection head mechanisms, and the spot cooling channels and the injection head mechanisms are arranged in parallel.

4. The injection mold for a multi-insert housing according to claim 1, characterized in that: There is a height difference between the inner ring space and the outer ring space, the movable mold core protrudes toward the outer ring space to form an annular convex rib, the slider assembly is inserted into the outer ring space, and at least part of the lateral insert is inserted into the annular convex rib from the outer ring space.

5. The injection mold for a multi-insert housing according to claim 1, characterized in that: The surfaces on both sides of the diverter plate are partially recessed to form an upper heating groove and a lower heating groove. The heating mechanism includes an upper heating element and a lower heating element. The upper heating element is embedded in the upper heating groove, and the lower heating element is embedded in the lower heating groove. The injection head mechanism is located in the area surrounded by the upper heating element and the lower heating element.

6. The injection mold for a multi-insert housing according to claim 1, characterized in that: The fixed mold device and the movable mold device are combined to form two symmetrically arranged molding cavities. The manifold is provided with a plurality of symmetrically distributed branch channels, and the branch channels respectively perform synchronous injection to the two molding cavities through the injection head mechanism.

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