High-efficiency double-material injection mold structure

Abstract

The utility model discloses a kind of high-efficiency double-material injection mould structures, including lifting fixed mould mechanism and rotating movable mould mechanism: lifting fixed mould mechanism contains the fixed mould seat and lifting cylinder with symmetrical first, second die cavity, fixed mould seat is equipped with integrated cooling waterway with flow regulating valve;Rotating movable mould mechanism contains the movable die plate with symmetrical punch, and rotating drive assembly consisting of servo motor, speed reducer, rotating shaft, also be equipped with annular guide groove, elastic guide block and positioning pin hole, torque sensor is arranged between movable die plate and rotating shaft.The structure shortens production cycle, reduces punch and die cavity alignment error, improves product pass rate, reduces twice injection shrinkage rate difference, mold abnormal damage can also be avoided.

Description

Technical Field

[0001] This utility model relates to injection mold technology, and in particular to a high-efficiency dual-material injection mold structure, which is suitable for the production of plastic parts that require two colors or two materials to be molded in one piece, such as appliance shells and automotive parts. Background Technology

[0002] Two-color injection molding technology, capable of achieving integrated molding of multi-color or multi-material plastic parts, offers significant advantages in product appearance design and functional integration, and is widely used in various manufacturing fields. Existing two-color injection molds mainly fall into two structural categories: one uses two independent molds, with a robotic arm transferring the semi-finished product for secondary injection molding. This method requires two molds mounted on two separate injection molding machines, resulting in high equipment investment, time-consuming semi-finished product transfer, and low production efficiency. The other uses a rotary dual-cavity mold, where cavity switching is achieved through rotary rotation. However, the traditional rotary structure has significant drawbacks:

[0003] Low switching efficiency: The turntable needs to rotate at an angle of 180°. The traditional hydraulically driven turntable mechanism has a slow rotation speed (it takes 5-8 seconds to complete one switching), and the start-stop process before and after rotation is not smooth, which leads to an extended overall production cycle.

[0004] Insufficient positioning accuracy: The alignment of the turntable and the fixed mold relies on simple mechanical limits, which are prone to wear after long-term use, resulting in uneven clearance between the punch and the mold cavity (the error often exceeds 0.05mm). Plastic parts are prone to defects such as flash and misalignment, and the pass rate is usually less than 90%.

[0005] Independent cooling systems: The cooling water channels of the two mold cavities are independent of each other and need to be controlled separately. This not only increases the complexity of the internal structure of the mold, but also causes differences in the molding shrinkage rate of the two injections due to inconsistent cooling efficiency, affecting the dimensional stability of the product.

[0006] The aforementioned problems make it difficult to improve the production efficiency of traditional two-color injection molds, and the product quality stability is insufficient, which cannot meet the needs of large-scale mass production. Utility Model Content

[0007] To address the problems of low switching efficiency, insufficient positioning accuracy, and unreasonable cooling system design in existing two-color injection molds, which lead to long production cycles and low product qualification rates, this utility model provides a high-efficiency two-material injection mold structure. By optimizing the mold's rotation switching mechanism, positioning guide structure, and cooling system, it achieves simultaneous improvement in two-color injection efficiency and product quality.

[0008] To achieve the above and other related objectives, the technical solution provided by this utility model is: a high-efficiency dual-material injection mold structure, including a lifting fixed mold mechanism and a rotating moving mold mechanism; the lifting fixed mold mechanism includes a fixed mold base and a lifting drive assembly, the working surface of the fixed mold base is provided with a first mold cavity and a second mold cavity, the first mold cavity and the second mold cavity are symmetrically distributed along the central axis of the fixed mold base, the first mold cavity is provided with a first inlet and a second inlet, the second mold cavity is provided with a third inlet and a fourth inlet, the first inlet and the third inlet are connected to a first material feeding system, and the second inlet and the fourth inlet are connected to a second material feeding system. The lifting drive assembly is driven by the fixed mold base and is used to drive the fixed mold base to lift. The rotating moving mold mechanism includes a moving mold plate, a rotating drive assembly, and a positioning guide assembly. The working surface of the moving mold plate is provided with a first punch and a second punch. The first punch matches the first mold cavity, and the second punch matches the second mold cavity. The two punches are symmetrically distributed along the central axis of the moving mold plate. The rotating drive assembly is driven by the moving mold plate and is used to drive the moving mold plate to rotate 180° around the central axis. The positioning guide assembly includes a positioning pin provided on the fixed mold base and a positioning hole provided on the moving mold plate. The positioning pin and the positioning hole are correspondingly matched.

[0009] The preferred technical solution is as follows: the lifting drive assembly includes a lifting cylinder, the telescopic end of which is connected to the fixed mold base for driving the fixed mold base to lift.

[0010] The preferred technical solution is as follows: the rotary drive assembly includes a servo motor, a reducer and a rotary shaft. One end of the rotary shaft is fixedly connected to the moving template, and the other end is connected to the output shaft of the servo motor through the reducer. The control accuracy of the servo motor is not less than 0.1°.

[0011] A preferred technical solution is as follows: the positioning and guiding component further includes an annular guide groove disposed on the working surface of the fixed mold base and an elastic guide block disposed on the working surface of the moving mold plate. The elastic guide block is slidably engaged with the annular guide groove, and the center of the annular guide groove coincides with the central axis of the fixed mold base.

[0012] The preferred technical solution is as follows: four positioning pins are provided and distributed in a circular array along the central axis of the fixed mold base; the positioning holes correspond one-to-one with the positioning pins; and the fitting clearance between the positioning pins and the positioning holes is 0.01-0.03 mm.

[0013] The preferred technical solution is as follows: the fixed mold base is provided with an integrated cooling water channel, the integrated cooling water channel includes a main water channel and branch water channels that are respectively connected to the first mold cavity and the second mold cavity, the outlet end of the branch water channel is close to the surface of the mold cavity, and the outlet end is provided with a flow regulating valve.

[0014] The preferred technical solution is that the diameter of the integrated cooling water channel is 8-12mm, and the distance between the branch water channel and the mold cavity surface is 5-8mm.

[0015] A preferred technical solution is that a torque sensor is provided between the moving template and the rotating shaft, and the torque sensor is electrically connected to the control system of the rotating drive assembly.

[0016] Due to the application of the above technical solution, the beneficial effects of this utility model are as follows:

[0017] Significantly improved switching efficiency: The rotary moving mold mechanism driven by a servo motor reduces the switching time for a single 180° rotation from the traditional 5-8 seconds to 2-3 seconds. Combined with the synchronous cooling design of the integrated cooling water circuit, the overall production cycle is shortened by 30%-40%.

[0018] Positioning accuracy is greatly improved: through the pre-guidance of the annular guide groove and the cooperation of 4 sets of high-precision positioning pin holes (gap 0.01-0.03mm), the alignment error between the punch and the mold cavity is controlled within 0.02mm, the defect rate of plastic parts such as flash and misalignment is reduced to less than 1%, and the product qualification rate is increased to more than 99%.

[0019] Enhanced cooling stability: The integrated cooling water circuit achieves precise control of the cooling intensity of the two mold cavities through the flow regulating valve, and the difference in molding shrinkage rate between the two injections is controlled within 0.1%, significantly improving the dimensional stability of the product.

[0020] Enhanced operational safety: The torque sensor effectively prevents mold damage caused by abnormal jamming during rotation, reducing equipment maintenance costs. Attached Figure Description

[0021] Figure 1 This is a front view of the two-color injection mold involved in this utility model. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0023] Please see Figure 1It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example:

[0026] like Figure 1As shown, according to a general technical concept of this utility model, a high-efficiency dual-material injection mold structure is provided, including a lifting fixed mold mechanism and a rotating moving mold mechanism; the lifting fixed mold mechanism includes a fixed mold base 1 and a lifting drive assembly 2. The working surface of the fixed mold base 1 is provided with a first mold cavity 11 and a second mold cavity 12. The first mold cavity 11 and the second mold cavity 12 are symmetrically distributed along the central axis of the fixed mold base 1. The first mold cavity is provided with a first inlet and a second inlet, and the second mold cavity is provided with a third inlet and a fourth inlet. The first inlet and the third inlet are connected to a first material feeding system, and the second inlet and the fourth inlet are connected to a second material feeding system. The lifting drive assembly 2 is connected to... The fixed mold base 1 is driven by a transmission connection and is used to drive the fixed mold base 1 to rise and fall; the rotating moving mold mechanism includes a moving mold plate 3, a rotating drive assembly 4, and a positioning guide assembly. The working surface of the moving mold plate 3 is provided with a first punch 31 and a second punch 32. The first punch 31 matches the first mold cavity 11, and the second punch 32 matches the second mold cavity 12. The two punches are symmetrically distributed along the central axis of the moving mold plate 3; the rotating drive assembly 4 is driven by the moving mold plate 3 and is used to drive the moving mold plate 3 to rotate 180° around the central axis; the positioning guide assembly includes a positioning pin 51 provided on the fixed mold base 1 and a positioning hole 52 provided on the moving mold plate 3. The positioning pin 51 and the positioning hole 52 are correspondingly matched.

[0027] like Figure 1 As shown, in an exemplary embodiment of this utility model, the lifting drive assembly 2 includes a lifting cylinder 21, the telescopic end of which is connected to the fixed mold base 3 for driving the fixed mold base 3 to lift.

[0028] like Figure 1 As shown, in an exemplary embodiment of this utility model, the rotary drive assembly 4 includes a servo motor 41, a reducer 42 and a rotary shaft 43. One end of the rotary shaft 43 is fixedly connected to the moving template 3, and the other end is connected to the output shaft of the servo motor 41 through the reducer 42. The control accuracy of the servo motor 41 is not less than 0.1°.

[0029] like Figure 1 As shown, in an exemplary embodiment of this utility model, the positioning and guiding assembly further includes an annular guide groove 53 disposed on the working surface of the fixed mold base 1 and an elastic guide block 54 disposed on the working surface of the moving mold plate 3. The elastic guide block 54 is slidably engaged with the annular guide groove 53, and the center of the annular guide groove 53 coincides with the central axis of the fixed mold base 3. It should be noted that the elastic guide block 54 is composed of a guide block and a spring. The guide block is connected to the working surface of the moving mold plate 3 through the spring, and can reciprocate in the vertical direction, achieving positioning without affecting mold closing.

[0030] like Figure 1As shown, in an exemplary embodiment of this utility model, there are four positioning pins 51 arranged in a circular array along the central axis of the fixed mold base 1. The positioning holes 52 correspond one-to-one with the positioning pins 51, and the fitting clearance between the positioning pins 51 and the positioning holes 52 is 0.01-0.03mm.

[0031] like Figure 1 As shown, in an exemplary embodiment of this utility model, the fixed mold base 1 is provided with an integrated cooling water channel. The integrated cooling water channel includes a main water channel and branch water channels that are respectively connected to the first mold cavity 11 and the second mold cavity 12. The outlet end of the branch water channel is close to the surface of the mold cavity, and the outlet end is provided with a flow regulating valve.

[0032] like Figure 1 As shown, in an exemplary embodiment of this utility model, the diameter of the integrated cooling water channel is 8-12mm, and the distance between the branch water channel and the mold cavity surface is 5-8mm.

[0033] like Figure 1 As shown, in an exemplary embodiment of this utility model, a torque sensor is provided between the moving template 3 and the rotating shaft 43, and the torque sensor is electrically connected to the control system of the rotating drive assembly 4.

[0034] Therefore, this utility model has the following advantages:

[0035] This invention achieves multi-dimensional improvements in efficiency, precision, quality, and safety through targeted structural improvements. Firstly, the servo motor-driven rotary mold mechanism reduces the 180° mold cavity switching time from the traditional 5-8 seconds to 2-3 seconds. Combined with integrated cooling water circuits operating synchronously, the overall production cycle is shortened by 30%-40%, significantly improving batch production efficiency. Secondly, the annular guide groove pre-guides, along with four sets of high-precision positioning pin holes (with a clearance of 0.01-0.03mm), controlling the alignment error between the punch and the mold cavity to within 0.02mm. This reduces the defect rate of flash and misalignment in plastic parts to below 1%, increasing the product qualification rate from below 90% to over 99%. Thirdly, the integrated cooling water circuit precisely regulates the cooling intensity of the two mold cavities through flow valves, ensuring a shrinkage rate difference of ≤0.1% between the two injection molding processes, guaranteeing product dimensional stability. Fourth, the torque sensor between the moving template and the rotating shaft can monitor abnormal resistance in real time and trigger a shutdown, avoiding mold damage, reducing equipment maintenance costs, and fully adapting to the high-efficiency and high-quality production needs of two-color plastic parts in home appliances, automobiles and other fields.

[0036] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A high-efficiency dual-material injection mold structure, characterized in that, The system includes a lifting fixed mold mechanism and a rotating moving mold mechanism. The lifting fixed mold mechanism includes a fixed mold base and a lifting drive assembly. The working surface of the fixed mold base has a first mold cavity and a second mold cavity, which are symmetrically distributed along the central axis of the fixed mold base. The first mold cavity has a first inlet and a second inlet, and the second mold cavity has a third inlet and a fourth inlet. The first inlet and the third inlet are connected to a first material feeding system, and the second inlet and the fourth inlet are connected to a second material feeding system. The lifting drive assembly is drively connected to the fixed mold base and is used for... The fixed mold base is driven to rise and fall; the rotating moving mold mechanism includes a moving mold plate, a rotating drive assembly, and a positioning guide assembly. The working surface of the moving mold plate is provided with a first punch and a second punch. The first punch matches a first mold cavity, and the second punch matches a second mold cavity. The two punches are symmetrically distributed along the central axis of the moving mold plate. The rotating drive assembly is connected to the moving mold plate for driving the moving mold plate to rotate 180° around the central axis. The positioning guide assembly includes a positioning pin provided on the fixed mold base and a positioning hole provided on the moving mold plate. The positioning pin and the positioning hole are correspondingly matched.

2. The high-efficiency dual-material injection mold structure according to claim 1, characterized in that: The lifting drive assembly includes a lifting cylinder, the extension end of which is connected to the fixed mold base for driving the fixed mold base to lift.

3. The high-efficiency dual-material injection mold structure according to claim 1, characterized in that: The rotary drive assembly includes a servo motor, a reducer, and a rotary shaft. One end of the rotary shaft is fixedly connected to the moving template, and the other end is connected to the output shaft of the servo motor through the reducer. The control accuracy of the servo motor is not less than 0.1°.

4. The high-efficiency dual-material injection mold structure according to claim 1, characterized in that: The positioning and guiding assembly further includes an annular guide groove disposed on the working surface of the fixed mold base and an elastic guide block disposed on the working surface of the moving mold plate. The elastic guide block is slidably engaged with the annular guide groove, and the center of the annular guide groove coincides with the central axis of the fixed mold base.

5. The high-efficiency dual-material injection mold structure according to claim 4, characterized in that: The locating pins are provided in a four-way circular array along the central axis of the fixed mold base. The locating holes correspond one-to-one with the locating pins, and the fit clearance between the locating pins and the locating holes is 0.01-0.03 mm.

6. The high-efficiency dual-material injection mold structure according to claim 1, characterized in that: The fixed mold base is equipped with an integrated cooling water channel, which includes a main water channel and branch water channels that are respectively connected to the first mold cavity and the second mold cavity. The outlet end of the branch water channel is close to the surface of the mold cavity and is equipped with a flow regulating valve.

7. The high-efficiency dual-material injection mold structure according to claim 6, characterized in that: The diameter of the integrated cooling water circuit is 8-12mm, and the distance between the branch water circuit and the mold cavity surface is 5-8mm.

8. The high-efficiency dual-material injection mold structure according to claim 1, characterized in that: A torque sensor is provided between the moving template and the rotating shaft, and the torque sensor is electrically connected to the control system of the rotating drive assembly.

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