CN210679574U - Injection mold of impeller - Google Patents

Abstract

An injection mold of an impeller comprises an upper mold core, a lower mold insert, an upper mold exhaust insert group and a lower mold exhaust insert group; the upper die core is provided with a first parting surface for molding one surface of the hub, and the lower die core is provided with a second parting surface for molding the other surface of the hub; the lower mold core is also provided with a first blade groove for forming a blade, the first blade groove is parallel to the running direction of the lower mold core, the lower mold insert is connected below the lower mold core, and the lower mold insert is provided with a second blade groove matched with the first blade groove; the upper die exhaust insert group is arranged on a first parting surface of the upper die core, and the lower die exhaust insert group is arranged on a second parting surface of the lower die core. Mainly when adopting 40% glass fiber to strengthen PPS engineering plastics as the material of moulding plastics, it is more even to fill, and the shrink is close the uniformity, guarantees impeller outward appearance and dimensional accuracy and stability after moulding plastics.

Description

Injection mold of impeller

Technical Field

The utility model belongs to the technical field of the mould is moulded plastics, a injection mold of impeller is related to, be applicable to the injection-moulded manufacturing of the large-scale impeller of open-type.

Background

In the field of heavy commercial vehicles, a large-displacement engine must be provided with a large mechanical water pump, and correspondingly, a heavy large impeller with a diameter of 180mm is also provided, wherein the diameter of the large impeller is 130-180 mm. Similarly, the water pumps used in cooling systems for commercial vehicles must be powerful and highly loaded, and the large impeller must have high mechanical strength, high rigidity, fatigue resistance, water erosion resistance, chemical resistance, and finally high dimensional and crystallographic stability.

The existing large impeller applied to a heavy commercial vehicle is generally a metal piece or a PPO plastic piece, if the precision of the metal piece is required to be achieved, the metal piece is required to be processed by a CNC, and the manufacturing cost is high; considering water erosion and rust prevention, the material selection and material cost are also high. The PPO plastic has the same overall performance inferior to PPS, and a product with the thickness of 8-20mm is molded, and the PPS glass fiber reinforced large impeller is superior in shrinkage control and crystallization stability.

The flowability of the glass fiber reinforced PPS material is poor, and when the existing injection mold is used for injection molding of the material, the large impeller can be unevenly filled, the shrinkage of some parts of the large impeller is inconsistent, and the problems of depression and uneven surface are caused after molding, so that the appearance and the function of the large impeller are influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of the prior art, the utility model aims to provide an injection mold of impeller mainly is when adopting 40% glass fiber to strengthen PPS engineering plastics as the material of moulding plastics, and it is more even to fill, and the shrink is close the uniformity, guarantees impeller outward appearance and size precision and stability after moulding plastics.

The utility model discloses a realize through following technical scheme.

The technical scheme of the utility model is an injection mold of an impeller, which comprises an upper mold core, a lower mold insert, an upper mold exhaust insert group and a lower mold exhaust insert group;

the upper die core is provided with a first parting surface for molding one surface of the hub, and the lower die core is provided with a second parting surface for molding the other surface of the hub;

the lower mold core is also provided with a first blade groove for forming a blade, the first blade groove is parallel to the running direction of the lower mold core, the lower mold insert is connected below the lower mold core, and the lower mold insert is provided with a second blade groove matched with the first blade groove;

the upper die exhaust insert group is arranged on a first parting surface of the upper die core, and the lower die exhaust insert group is arranged on a second parting surface of the lower die core.

The technical scheme has the advantages that the exhaust insert group is arranged on the parting surface, so that gas in the cavity can escape from gaps of the exhaust insert group, the fluidity resistance of the injection molding material is increased, and the filling is rapid and uniform; in addition, because the blade is thinner and higher, the first blade groove on the lower mold core is very deep, and the too deep groove has great difficulty in processing the mold, so that the height of each blade is difficult to be ensured to be consistent, the first blade groove is processed to be through, the forming of the top of each blade is determined by the second blade groove on the lower mold insert, and the second blade groove can be required to be very shallow and is easy to process, so that the height of each blade is easy to be ensured to be consistent.

In an embodiment of the present invention, the upper mold exhaust insert group includes at least one upper mold exhaust insert assembly, the upper mold exhaust insert assembly includes an upper mold exhaust fixing frame and a plurality of upper mold exhaust members, the plurality of upper mold exhaust members are fixedly embedded in the upper mold exhaust fixing frame, and each upper mold exhaust fixing frame is installed in an upper mold exhaust insert groove of the first parting surface.

In an embodiment of the present invention, the upper mold exhaust insert group includes four to eight upper mold exhaust insert components, and all the upper mold exhaust insert components are arranged in a circumferential array around the central axis of the upper mold core.

In an embodiment of the technical scheme, an upper mold vent hole is formed in the bottom surface of the upper mold exhaust insert groove and is communicated with the upper surface of the upper mold core and the upper mold exhaust insert groove.

In an embodiment of the technical solution, the upper mold core is further provided with a plurality of upper mold insert pins, the upper mold insert pins are arranged in a circumferential array on a central axis of the upper mold core and are used for forming mounting holes of the impeller, and the upper mold insert pins further extend into the lower mold core and have a guiding function.

In an embodiment of the technical solution, the lower mold exhaust insert group includes at least one lower mold exhaust insert component, and a lower mold exhaust insert groove for accommodating the lower mold exhaust insert component is formed on the lower mold core; the lower die exhaust insert groove penetrates through the lower die core to the lower surface or the side surface of the lower die core.

In an embodiment of the present invention, the lower mold exhaust insert group includes three to eight lower mold exhaust insert assemblies, and all the lower mold exhaust insert assemblies are arranged in a circumferential array around a lower mold core central axis.

In one embodiment of the present invention, the lower mold venting insert assembly comprises a plurality of lower mold venting units, wherein at least one lower mold venting unit is disposed at a side of the second parting surface and vents air toward a side of the lower mold core, and the remaining lower mold venting units are disposed in a lower mold venting insert pocket of the second parting surface and vent air toward a lower surface of the lower mold core.

In one embodiment of this aspect, the lower mold venting insert assembly comprises a first lower mold venting unit, a second lower mold venting unit, a third lower mold venting unit, and a fourth lower mold venting unit;

the first lower die exhaust unit is arranged on the side edge of the second parting surface and exhausts air towards the side surface of the lower die core, and the second lower die exhaust unit, the third lower die exhaust unit and the fourth lower die exhaust unit are arranged in a lower die exhaust insert groove of the second parting surface and exhaust air towards the lower surface of the lower die core.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and the drawings in the following description are only directed to some embodiments, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a structural view of a large impeller in the embodiment of the present application.

Fig. 2 is another structural view of a large impeller in the embodiment of the present application.

Fig. 3 is an exploded view of the injection mold in the embodiment of the present application.

Fig. 4 is a front view of a second parting surface of the lower mold core in an embodiment of the present application.

Fig. 5 is a front view of the lower surface of the lower core in an embodiment of the present application.

Fig. 6 is a perspective view of the lower surface of the lower core in the embodiment of the present application.

Fig. 7 is a structural view of an upper core and an upper die exhaust insert set in the embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the scope of the present disclosure.

In the following description, suffixes such as "module", "component", "assembly", or "unit" are used only for the convenience of description of the present invention, and do not have a specific meaning per se. And thus may be used mixedly.

The present invention will be described in further detail with reference to the following detailed description of preferred embodiments and accompanying drawings.

Examples

As shown in fig. 1 and 2, a large impeller 10 includes a hub 101 and blades 102, the blades are vertically connected to the hub and circumferentially arrayed around the hub along a central axis at one side of the hub, the number of the blades is eight, the impeller is large in size, and the hub and the blades are thick.

The height of the middle position of the blade 102 is larger than the height of the opening at the periphery of the impeller, a circle of first circular ring bulge 1011 is arranged on the upper side surface without the blade along the central hole, a triangular groove is arranged at the bulge position of the central hole, the triangular groove is the mounting and fixing function of the impeller and is provided with a mounting hole 103, and a circle of second circular ring bulge 1012 is arranged on the excircle, so that a high-low-secondary-high three-section circular ring track is formed on the upper side surface without the blade; a trumpet-shaped bulge 1013 is formed at the center of the lower side surface provided with the blades along the hole position, the end surfaces of the blades form an included angle of 75-80 degrees with the central shaft, the upper side surface without the blades faces the upper mold core in the injection mold, and the lower side surface provided with the blades faces the lower mold core.

The PPS engineering plastic reinforced by 40 percent of glass fiber for the large impeller has the performance close to metal, has high strength, high rigidity and oil resistance, corrosion resistance, hydrolysis resistance and chemical stability, and is the best material option in various liquid working media.

The large impeller requires 70NM rated torque test, in a high-power water pump, the impeller with high rotating speed and self dead weight must reach rated torque, because the impeller of the water pump, the assembly clearance of the impeller in the water pump must also be a rated value, only in this way, the effect can be achieved, the engine is fully cooled, the assembly clearance is too small, the size of a part must reach rated precision, and the large impeller has great challenge in the aspects of considering mechanical strength and size precision.

The 40% glass fiber reinforced PPS engineering plastic used for the large impeller is characterized in that the higher the mold temperature is, the better the crystallinity is and the better the mechanical strength is, but the too high mold temperature is, the product is easy to shrink and deform, the dimensional accuracy is seriously influenced, and the mold durability and the manufacturability are also great challenges.

As shown in fig. 3 to 7, this embodiment is an injection mold for injection molding the above-described large impeller using 40% glass fiber reinforced PPS engineering plastic.

The injection mold comprises an upper mold core 20, a lower mold core 30, a lower mold insert 60, an upper mold exhaust insert group 40 and a lower mold exhaust insert group 50; the upper mold core and the lower mold core are both in a cylindrical structure, a first parting surface 201 for molding one surface of the hub 101 is arranged on the lower surface of the upper mold core 20, and a second parting surface 301 for molding the other surface of the hub 101 is arranged on the upper surface of the lower mold core 30.

The upper mold exhaust insert group 40 is mounted on a first parting surface of the upper mold core 20, and specifically, a plurality of upper mold exhaust insert grooves 202 are formed on the first parting surface to be recessed inward, and the upper mold exhaust insert grooves penetrate the upper surface of the upper mold core, for example, upper mold exhaust holes 203 are provided on the bottom surface of the upper mold exhaust insert grooves, and the upper mold exhaust holes communicate the upper mold exhaust insert grooves 202 with the upper surface 204 of the upper mold core 20.

The upper mold exhaust insert group 40 comprises four upper mold exhaust insert components, and the central axes of the mold cores above all the upper mold exhaust insert components are arranged in a circumferential array. Each upper mold exhaust insert assembly comprises an upper mold exhaust fixing frame 401 and a plurality of upper mold exhaust members 402, wherein the plurality of upper mold exhaust members are fixedly embedded in the upper mold exhaust fixing frame, and the upper mold exhaust fixing frame is embedded in the upper mold exhaust insert groove 202.

After the injection-molded high-temperature melt enters the cavity, the gas at the front end of the wave front is quickly raised to about 400 ℃ due to shear heat and friction heat, and the gas can be discharged from a gap between the upper die exhaust parts.

Three upper die insert pins 70 are fixedly arranged on the upper die core 20, the central shafts of the upper die core and the lower die core are arranged in a circumferential array manner, namely, are arranged in a regular triangle manner and are used for forming the mounting holes 103 of the impeller, and the upper die insert pins also extend and are inserted into the lower die core to have a guiding function.

The lower mold core 30 is further provided with through first blade grooves 302 for forming the blades 102, the number of the first blade grooves is eight, the first blade grooves 302 are parallel to the central axis of the lower mold core, and the central axes of the lower mold cores below the first blade grooves are arranged in a circle and array.

The lower mold insert 60 is connected below the lower mold core 30, and a second vane groove 601 that is engaged with the first vane groove 302 is provided in the lower mold insert, and the first vane groove and the second vane groove together constitute a molding cavity for each vane.

The lower mold exhaust insert set 50 is mounted on a second parting surface 301 of the lower mold core 30, and specifically, a lower mold exhaust insert groove 303 for accommodating the lower mold exhaust insert set is provided on the lower mold core, and the lower mold exhaust insert set is inserted into the lower mold exhaust insert grooves, which penetrate the lower mold core to the lower surface or side of the lower mold core.

The lower die exhaust insert group comprises four lower die exhaust insert components, and the four lower die exhaust insert components are arranged on the circumference of the central shaft of the die core below the lower die exhaust insert components in an array mode.

Each set of lower mold exhaust insert assemblies comprises four lower mold exhaust units, one lower mold exhaust unit is arranged on the side of the second parting surface and exhausts air towards the side surface of the lower mold core, and the rest lower mold exhaust units are arranged in the lower mold exhaust insert grooves of the second parting surface and exhaust air towards the lower surface of the lower mold core.

Specifically, lower mold exhaust insert assembly 50 includes a first lower mold exhaust unit 501, a second lower mold exhaust unit 502, a third lower mold exhaust unit 503, and a fourth lower mold exhaust unit 504; the first lower die exhaust unit is arranged on the side edge of the second parting surface and exhausts air towards the side surface of the lower die core, and the second lower die exhaust unit, the third lower die exhaust unit and the fourth lower die exhaust unit are arranged in a lower die exhaust insert groove of the second parting surface and exhaust air towards the lower surface of the lower die core.

The exhaust inserts are arranged on the parting surfaces of the upper mold core and the lower mold core, when high-temperature melt of PPS material enters a cavity, gas at the front end of the wave front rapidly rises to about 400 ℃ due to shear heat and friction heat, and due to a sufficient exhaust system formed by the 12 groups of exhaust inserts and the upper and lower mold cores, the gas can escape from gaps between the exhaust inserts and exhaust insert grooves, so that the large impeller which is injection-molded is qualified in appearance, size and performance.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement.

Claims (9)

1. The injection mold for the impeller is characterized by comprising an upper mold core, a lower mold insert, an upper mold exhaust insert group and a lower mold exhaust insert group;

the upper die core is provided with a first parting surface for molding one surface of the hub, and the lower die core is provided with a second parting surface for molding the other surface of the hub;

the lower mold core is also provided with a first blade groove for forming a blade, the first blade groove is parallel to the running direction of the lower mold core, the lower mold insert is connected below the lower mold core, and the lower mold insert is provided with a second blade groove matched with the first blade groove;

the upper die exhaust insert group is arranged on a first parting surface of the upper die core, and the lower die exhaust insert group is arranged on a second parting surface of the lower die core.

2. The injection mold for an impeller according to claim 1, wherein the upper mold exhaust insert set includes at least one upper mold exhaust insert assembly, the upper mold exhaust insert assembly including an upper mold exhaust fixing frame and a plurality of upper mold exhaust members fixedly embedded in the upper mold exhaust fixing frame, each of the upper mold exhaust fixing frames being installed in one upper mold exhaust insert groove of the first parting surface.

3. The injection mold for an impeller of claim 2, wherein the upper mold exhaust insert set comprises four to eight upper mold exhaust insert assemblies, all of which are arranged in a circumferential array about the upper core center axis.

4. The injection mold for the impeller of claim 2, wherein an upper mold vent hole is formed in a bottom surface of the upper mold vent insert groove, and the upper mold vent hole communicates the upper mold vent insert groove and an upper surface of the upper mold core.

5. The injection mold for the impeller of claim 1, wherein the upper mold core is further provided with a plurality of upper mold insert pins, the upper mold insert pins are arranged in a circumferential array on the central axis of the upper mold core and are used for forming the mounting holes of the impeller, and the upper mold insert pins further extend into the lower mold core and have a guiding function.

6. The injection mold for an impeller of claim 1, wherein the lower mold exhaust insert set comprises at least one lower mold exhaust insert assembly, and a lower mold exhaust insert groove for receiving the lower mold exhaust insert assembly is provided on the lower mold core; the lower die exhaust insert groove penetrates through the lower die core to the lower surface or the side surface of the lower die core.

7. The injection mold for an impeller of claim 6, wherein the lower mold exhaust insert set comprises three to eight lower mold exhaust insert assemblies, all of which are arranged in a circumferential array about a lower core center axis.

8. The injection mold for an impeller of claim 6, wherein the lower mold degassing insert assembly comprises a plurality of lower mold degassing units, wherein at least one lower mold degassing unit is disposed at a side of the second parting surface and exhausts toward a side of the lower mold core, and the remaining lower mold degassing units are disposed at a lower mold degassing insert groove of the second parting surface and exhausts toward a lower surface of the lower mold core.

9. The injection mold for an impeller of claim 8, wherein the lower mold venting insert assembly comprises a first lower mold venting unit, a second lower mold venting unit, a third lower mold venting unit, and a fourth lower mold venting unit;

the first lower die exhaust unit is arranged on the side edge of the second parting surface and exhausts air towards the side surface of the lower die core, and the second lower die exhaust unit, the third lower die exhaust unit and the fourth lower die exhaust unit are arranged in a lower die exhaust insert groove of the second parting surface and exhaust air towards the lower surface of the lower die core.

Images