Motor heat sink and manufacturing mold and method thereof

Abstract

The application discloses a motor heat dissipation piece, a manufacturing die and a manufacturing method thereof. The manufacturing die of the motor heat dissipation piece comprises a male die core, a first die core core, a female die core and a second die core core. The first die core core is accommodated in a first accommodating cavity of the male die core. A groove is arranged on the side wall of the first die core core. The groove and the inner wall of the first accommodating cavity form a first cooling water channel. The second die core core is accommodated in a second accommodating cavity of the female die core. A groove is arranged on the side wall of the second die core core. The groove forms a second cooling water channel. One end of the first die core core is connected with one end of the second die core core. The end of the first die core core and the end of the second die core core have a gap. The gap forms a forming die cavity of the motor heat dissipation piece. The first cooling water channel and the second cooling water channel form annular cooling water channels respectively and are arranged on the two sides of the forming die cavity. The application realizes the forming of the plastic part through the cooperation of the die core core and the die core.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precision injection molding of high-speed motors, and in particular to a precision plastic heat dissipation part for a high-speed motor of a small household appliance and a manufacturing mold and method thereof. BACKGROUND

[0002] In recent years, the market for small household appliances, mainly hair dryers and vacuum cleaners, has developed rapidly. For example, the world's benchmark brand Dyson has always occupied the domestic and foreign high-end market, attracting other manufacturers to imitate and invest more research and development efforts and funds to continuously improve product quality. At the same time, domestic mainstream manufacturers such as Huawei and Xiaomi have launched a wave of smart home, attracting many emerging brands to enter the market, and the overall market development trend is good.

[0003] For small household appliances, the most core component is the motor, especially for high-end products, which require faster and more stable motor speed, high-speed continuous use without fatigue, maximum efficiency, and good flame retardation and insulation to ensure safety during use.

[0004] Therefore, the development trend of motors in the future will inevitably be more precise, smaller, safer, faster, and more stable, and an important prerequisite for achieving these goals is to make all components of the motor sufficiently precise.

[0005] For high-speed motors, the solution has always been to use metal parts, as the machined metal parts are highly stable, rigid, and precise. However, to achieve the goal of reducing costs without compromising quality, manufacturers have begun to try using injection molding instead of machining metal parts, which requires the precision of the injection molded product to be high enough, and the plastic used to be rigid and strong. However, such plastic particles cause considerable damage to injection molding machines and molds, and finding a balance is a challenge for major injection molding manufacturers.

[0006] Therefore, there is an urgent need for a new technical solution to solve the above problems and form a low-cost precision injection molding solution for high-speed motors to replace existing machining metal parts, reduce the cost of small household appliance manufacturing, and provide a research foundation for future product and industry needs through in-depth research on high-temperature engineering plastic precision injection molding technology. SUMMARY

[0007] The purpose of the present application is to solve the problems in the prior art and provide a precision plastic heat dissipation part for a high-speed motor of a small household appliance and a manufacturing mold and method thereof, which aims to produce and manufacture plastic parts through the manufacturing mold and method, replace metal parts with plastic parts, and reduce costs without compromising product performance. The technical solution adopted is as follows:

[0008] A mold for manufacturing a motor heat sink, comprising a male mold core, a first mold core insert matched with the male mold core, a female mold core, and a second mold core insert matched with the female mold core, wherein:

[0009] The male mold core has a first accommodating cavity, the first mold core insert is accommodated in the first accommodating cavity, a groove is arranged on the side wall of the first mold core insert, and the groove forms a first cooling water channel relative to the inner wall of the first accommodating cavity;

[0010] The female mold core has a second accommodating cavity, the second mold core insert is accommodated in the second accommodating cavity, a groove is arranged on the side wall of the second mold core insert, and the groove forms a second cooling water channel relative to the inner wall of the second accommodating cavity;

[0011] One end of the first mold core insert is matched with one end of the second mold core insert, and the end of the first mold core insert matched with the end of the second mold core insert has a gap, and the gap forms a forming mold cavity of the motor heat sink;

[0012] The first cooling water channel and the second cooling water channel are arranged on the two sides of the forming mold cavity respectively, and the first cooling water channel and the second cooling water channel form annular cooling water channels respectively.

[0013] Further, the mold for manufacturing a motor heat sink further comprises a blade forming block, the blade forming block has a blade forming cavity matched with the heat dissipation fin of the motor heat sink; the male mold core and the female mold core are arranged in opposite spaces, the blade forming block is arranged in the space between the male mold core and the female mold core, the side wall of the blade forming block abuts against the joint of the first mold core insert and the second mold core insert, and the heat dissipation fin of the motor heat sink in the forming mold cavity is formed by the blade forming cavity of the blade forming block.

[0014] Further, a groove and a forming surface are arranged on the end face of the first mold core insert matched with the second mold core insert, the groove is arranged at the center of the end face, and a circle of forming surfaces is arranged along the periphery of the end face, and the shape and size of the forming surface are matched with the shape and size of one side surface of the preformed motor heat sink respectively.

[0015] Further, the end face of the second mold core body where the first mold core body is connected is provided with a protrusion and a forming surface, the protrusion is arranged at the center of the end face, and the shape and size of the protrusion are matched with the groove of the first mold core body respectively, and the forming surface of the second mold core body is arranged opposite to the forming surface of the first mold core body, and the forming surface of the second mold core body is arranged around the end face of the second mold core body, and the shape and size of the forming surface of the second mold core body are matched with the shape and size of the other side surface of the preformed motor heat dissipation piece respectively.

[0016] Further, the forming surface of the second mold core body is arranged opposite to the forming surface of the first mold core body to form the body forming mold cavity of the motor heat dissipation piece.

[0017] Further, the first mold core body or the second mold core body is provided with a glue inlet hole, the material flows from the glue inlet hole to the body forming mold cavity, and then flows from the body forming mold cavity to the blade forming cavity of the blade forming block, and the body forming mold cavity and the blade forming cavity jointly form the motor heat dissipation piece.

[0018] Further, the glue inlet hole includes three, and the three glue inlet holes are uniformly arranged at the end of the first mold core body or the second mold core body close to the body forming mold cavity.

[0019] Further, the motor heat dissipation piece is a glass fiber polyphenylene sulfide heat dissipation piece.

[0020] Further, the upper and lower sides of the groove of the first mold core body forming the first cooling water channel are respectively provided with a ring-shaped groove, and two sealing rings are arranged in the two ring-shaped grooves, and the two sealing rings realize the sealing of the first cooling water channel.

[0021] Further, the upper and lower sides of the groove of the second mold core body forming the second cooling water channel are respectively provided with a ring-shaped groove, and two sealing rings are arranged in the two ring-shaped grooves, and the two sealing rings realize the sealing of the second cooling water channel.

[0022] Further, the first cooling water channel and the second cooling water channel realize the cooling forming of the preformed motor heat dissipation piece in the body forming mold cavity and the blade forming cavity.

[0023] Further, it further includes a heat shield, the heat shield includes a plurality of heat insulation plates, and the heat shield is arranged around the male mold core and the female mold core.

[0024] Further, the first mold core body and the second mold core body are provided with an exhaust gap, and the blade forming block is provided with an exhaust gap between the first mold core body and the second mold core body.

[0025] Based on the above-mentioned mold for manufacturing the motor heat dissipation piece, the application further provides a method for manufacturing the motor heat dissipation piece by using the above-mentioned mold, which comprises the following steps:

[0026] The first mold core is installed on the male mold core, the second mold core is installed on the female mold core, and the first mold core and the second mold core are oppositely installed, so that the gap between the first mold core and the second mold core forms a body forming cavity of the preformed motor heat dissipation piece;

[0027] The blade forming block is installed in the gap between the male mold core and the female mold core, so that the blade forming cavity on the blade forming block is communicated with the body forming cavity, and the blade forming cavity realizes the forming of the heat dissipation fins of the preformed motor heat dissipation piece;

[0028] Cooling water is respectively introduced into the first cooling water channel on the first mold core and the second cooling water channel on the second mold core;

[0029] Material is injected into the body forming cavity through the three glue injection holes on the first mold core or the second mold core, the material flows from the body forming cavity to the blade forming cavity, and the first cooling water channel and the second cooling water channel realize the cooling and shaping of the material in the body forming cavity and the blade forming cavity;

[0030] A heat insulation cover is arranged on the periphery of the male mold core and the female mold core.

[0031] Based on the above-mentioned mold for manufacturing the motor heat dissipation piece, the application further provides a motor heat dissipation piece manufactured by using the above-mentioned mold for manufacturing the motor heat dissipation piece, which comprises a heat dissipation piece body, the heat dissipation piece body has a through hole, the through hole forms a mounting hole for connecting the heat dissipation piece body with a driving shaft, a plurality of heat dissipation fins are uniformly arranged on the side wall of the heat dissipation piece body, and the plate surface of the heat dissipation fin forms an included angle with the central axis of the through hole.

[0032] Compared with the prior art, the application has one or more of the following beneficial effects:

[0033] 1. This invention provides a mold for manufacturing a heat sink for an electric motor. The mold includes a male mold core, a first mold core that mates with the male mold core, a female mold core, and a second mold core that mates with the female mold core. The first and second mold cores form the molding cavity for the heat sink. The male and female mold cores mate together to form cooling water channels on the two mold cores, thereby achieving the cooling and molding of the injection molded part. Therefore, this invention achieves the molding of plastic parts through the mate of the mold cores and the male and female mold cores, replacing metal parts in terms of shape and size. Furthermore, in order to reduce the performance difference between plastic parts and metal parts, this invention uses PPS glass fiber reinforced plastic raw materials. 65% glass fiber is added to PPS (polyphenylene sulfide) to modify it, which can reduce the deformation of the plastic, improve its thermal stability, increase its dimensional stability, and increase its high temperature resistance to 265℃.

[0034] 2. The mold for manufacturing motor heat sinks provided by the present invention is provided with an annular water channel, and sealing rings are provided on the upper and lower sides of the water channel. The annular water channel can ensure that the product is heated evenly and prevent uneven heating of the product during injection molding, which would lead to a loss of roundness and affect its use.

[0035] 3. The mold for manufacturing motor heat sinks provided by this invention uses UNIMAX high-quality mold steel from UPND. This grade of mold steel has good corrosion resistance, wear resistance, toughness, and good thermal strength. It also has good resistance to thermal cracking and overall cracking, and its hardness can reach 58HRC after heat treatment. When PPS with glass fiber reinforced plastic is injection molded, the melting temperature needs to reach above 300 degrees Celsius. During molding, a lot of gas is generated that corrodes the mold. Furthermore, the high glass fiber content impacts the mold core during injection filling, causing wear on the mold core surface. Therefore, the UNIMAX steel material selected in this invention can withstand the erosion caused by injection molding. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a cross-sectional structural diagram of the mold for manufacturing a motor heat sink according to the present invention in an installed state in one embodiment.

[0038] Figure 2 This is a perspective structural diagram of the mold for manufacturing the motor heat sink according to the present invention from a top view, which shows the structure of the annular water channel;

[0039] Figure 3This is a schematic diagram of the mold for manufacturing a motor heat sink according to one embodiment of the present invention in use.

[0040] Figure 4 This is a schematic diagram of the overall structure of the mold for manufacturing the heat sink of the motor according to one embodiment of the present invention after being covered by a heat insulation cover. As can be seen from the figure, the mold for manufacturing the heat sink of the motor is completely covered by the heat insulation cover.

[0041] Figure 5 This is a schematic diagram of a three-point glue injection state during the molding and glue injection of the motor heat sink component in one embodiment of the manufacturing method of the present invention.

[0042] Figure 6 This is a top view of the motor heat sink of the present invention in one embodiment;

[0043] Figure 7 yes Figure 6 The diagram shows a cross-sectional view of the motor heat sink along section AA.

[0044] Figure 8 This is a schematic diagram of the structure of the motor heat sink of the present invention in one embodiment;

[0045] Figure 9 This is a schematic diagram of the structure of the motor heat sink of the present invention in one embodiment;

[0046] Figure 10 This is a schematic diagram of the structure of the mold for manufacturing the motor heat sink according to the present invention, after being cut along the central axis of the whole in the installed and used state, in one embodiment.

[0047] Among them: 100 - molds for making motor heat sinks;

[0048] 110 - Male mold core; 111 - First receiving cavity;

[0049] 120 - First mold core; 121 - First cooling water channel; 122 - Groove; 123 - Molding surface;

[0050] 130 - Mother mold core; 131 - Second accommodating cavity;

[0051] 140 - Second mold core; 141 - Second cooling water channel; 142 - Protrusion; 143 - Molding surface;

[0052] 150 - Blade forming block; 151 - Blade forming cavity;

[0053] 160 - Body forming mold cavity;

[0054] 170 - Inlet hole;

[0055] 180 - Sealing ring;

[0056] 200 - heat shield

[0057] 300 - motor heat sink; 310 - heat sink body; 311 - through hole; 320 - heat sink fin DETAILED DESCRIPTION

[0058] The technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0059] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and 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 cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] The essence of the present application will be further illustrated below in combination with the drawings and embodiments.

[0062] Embodiment 1

[0063] At present, high-speed motors basically use metal parts, because the stability, rigidity and precision of machined metal parts are very high. But now in order to achieve the goal of reducing production cost without reducing quality, it is necessary to try to use injection molding instead of machining metal parts, which requires the precision of injection molded products to be high enough, the rigidity of the plastic used to be good, and the strength to be good, and such plastic particles also cause considerable damage to the injection molding machine and the mold.

[0064] It is known that high-speed motor has higher requirements for parts, including concentricity, flatness, dynamic balance and other parameters, the accuracy of these parameters will affect the speed and life of the motor, in order to achieve the accuracy of the parameter requirements, the high-speed motor still mainly uses metal materials at present, and the plastic motor is mainly used for low-speed products. The purpose of the present application is to form a set of low-cost precision injection molding solution for high-speed motor, to replace the existing machining metal part solution, and significantly reduce the manufacturing cost of small household appliances.

[0065] The present application provides a mold for manufacturing motor heat dissipation parts and a manufacturing method, aiming at replacing the machining metal parts to manufacture small household appliances high-speed motor by injection molding, reducing the production cost as much as possible under the premise of ensuring product quality, hoping to be the first to research the precision injection molding process of high-speed motor in the industry, meet the higher performance requirements of small household appliances for motors, and save manufacturing cost.

[0066] The mold for manufacturing motor heat dissipation parts provided by the present application will be described in detail below.

[0067] Referring to Figure 1 The mold 100 for manufacturing motor heat dissipation parts 300 provided by the present application comprises a male die core 110, a first die core core 120 matched with the male die core 110, a female die core 130, and a second die core core 140 matched with the female die core 130, wherein:

[0068] The male die core 110 has a first accommodating cavity 111, the first die core core 120 is accommodated in the first accommodating cavity 111, a ring of grooves is arranged on the side wall of the first die core core 120, and the grooves form a first cooling water channel 121 relative to the inner wall of the first accommodating cavity 111; similar to the design of the male die core, the female die core 130 has a second accommodating cavity 131, the second die core core 140 is accommodated in the second accommodating cavity 131, a ring of grooves is arranged on the side wall of the second die core core 140, and the grooves form a second cooling water channel 141 relative to the inner wall of the second accommodating cavity 131.

[0069] One end of the first die core core 120 is connected to one end of the second die core core 140, and the end of the first die core core 120 and the second die core core 140 has a gap, and the gap forms a forming mold cavity of the motor heat dissipation part 300; the first cooling water channel 121 and the second cooling water channel 141 are arranged on the two sides of the forming mold cavity respectively, and the first cooling water channel 121 and the second cooling water channel 141 form annular cooling water channels respectively, which can be seen from Figure 2Because the motor heat sink is a circular product, a circular core is made along the product, so that the core can be processed independently to ensure the roundness of the product. At the same time, an annular waterway is made between the core and the mold pin, and the waterway is sealed by the sealing ring on the upper and lower sides, and the middle is the waterway. For details, see Figure 2 The annular waterway can ensure that the product is evenly heated, and prevent uneven heating of the product during injection molding, which can cause poor roundness of the product and affect use.

[0070] In one embodiment, the mold for manufacturing the motor heat sink 300 also includes a fin forming block 150, as shown in Figure 3 The fin forming block 150 has a fin forming cavity 151 that matches the fins 320 of the motor heat sink 300. The male mold pin 110 is arranged in opposite spacing with the female mold pin 130, and the fin forming block 150 is arranged in the spacing between the male mold pin 110 and the female mold pin 130. The side wall of the fin forming block 150 abuts against the joint of the first mold pin core 120 and the second mold pin core 140, and the fins 320 of the motor heat sink 300 in the forming cavity are formed by the fin forming cavity 151 of the fin forming block 150.

[0071] Continuing to refer to Figure 1 The end face of the first mold pin core 120 and the second mold pin core 140 is provided with a groove 122 and a forming surface 123. The groove 122 is arranged at the center of the end face, and the forming surface 123 is arranged around the end face. The shape and size of the forming surface 123 match the shape and size of one side surface of the pre-formed motor heat sink 300. The end face of the second mold pin core 140 and the first mold pin core 120 is provided with a protrusion 142 and a forming surface 143. The protrusion 142 is arranged at the center of the end face, and the shape and size of the protrusion 142 match the groove 122 of the first mold pin core 120. The forming surface 143 of the second mold pin core 140 is arranged opposite to the forming surface 123 of the first mold pin core 120. The forming surface 143 of the second mold pin core 140 is arranged around the end face of the second mold pin core 140. The shape and size of the forming surface 143 of the second mold pin core 140 match the shape and size of the other side surface of the pre-formed motor heat sink 300.

[0072] In combination with Figure 1 and Figure 3 It can be seen that the forming surface 143 of the second mold pin core 140 and the forming surface 123 of the first mold pin core 120 are arranged in opposite spacing to form the body forming cavity 160 of the motor heat sink 300. See Figure 5It can be known that the first mold core 120 or the second mold core 140 is provided with a glue inlet hole 170, material flows from the glue inlet hole 170 to the body forming mold cavity 160, and flows from the body forming mold cavity 160 to the blade forming cavity 151 of the blade forming block 150, and the body forming mold cavity 160 and the blade forming cavity 151 jointly form the motor heat dissipation piece 300.

[0073] In an embodiment, continuing to refer to Figure 1 , the upper and lower sides of the groove of the first cooling water channel 121 formed on the first mold core 120 are respectively provided with a ring-shaped groove, and two sealing rings 180 are installed in the two ring-shaped grooves, and the two sealing rings 180 realize sealing of the first cooling water channel 121; the upper and lower sides of the groove of the second cooling water channel 141 formed on the second mold core 140 are respectively provided with a ring-shaped groove, and two sealing rings 180 are installed in the two ring-shaped grooves, and the two sealing rings 180 realize sealing of the second cooling water channel 141; the first cooling water channel 121 and the second cooling water channel 141 realize cooling forming of the pre-formed motor heat dissipation piece in the body forming mold cavity 160 and the blade forming cavity 151.

[0074] In an embodiment, referring to Figure 4 , the mold for manufacturing the motor heat dissipation piece 300 further comprises a heat shield 200, the heat shield 200 comprises a plurality of heat shield plates, and the heat shield 200 is arranged on the periphery of the male mold core 110 and the female mold core 130. The outside of the mold is wrapped with heat shield plates, which reduces heat loss of the mold, especially in winter, prevents the mold from being affected by the external environment too much, and causes seasonal size change of the product.

[0075] In an embodiment, referring to Figure 3 , the first mold core 120 and the second mold core 140 are provided with an exhaust gap, and the blade forming block 150 is provided with an exhaust gap between the first mold core 120 and the second mold core 140. The water channel needs to be heated to 150 degrees when the mold is working, so the design of the ejector sleeve, the ejector pin and the like on the mold core needs to be designed according to the thermal expansion coefficient of the mold core material itself, and a reasonable matching gap is given, so that the mold can move smoothly after heating, and flying edge will not occur. According to experience, when the exhaust is designed, the exhaust needs to be greater than 0.02 mm to be effective. Figure 3, the connecting position of the product and the mold core is designed with exhaust, the exhaust gap is 0.2mm, the connecting position of the blade forming block and the mold core is also designed with exhaust, the exhaust gap is 0.02mm, the exhaust depth of individual products and individual positions is larger, even allows to run a little flash to ensure the integrity of the product, and finally the flash is removed by trimming the flash.

[0076] Continuing to refer to Figure 5 , the glue inlet hole 170 includes three, three glue inlet holes 170 are uniformly arranged at the end of the first mold core 120 or the second mold core 140 close to the body forming mold cavity 160. The above-mentioned all scheme selection plus the final injection molding process stability, finally shows in the product size precision and stability. Among them, the size 46.4+ / -0.05 is the most difficult size to achieve. Referring to Figure 6 、 7 , the size of the motor heat dissipation piece is shown in the figure, and the above-mentioned 46.4+ / -0.05 is the size of the outer diameter of the motor heat dissipation piece. Figure 6

[0077] First, in order to ensure the uniformity of the product, the present application proposes to use three-plate mold three-point uniform glue feeding, which can ensure the uniformity of the whole product glue feeding. Combined with the annular waterway and the surrounding 10 sliders (see Figure 2 , Figure 2 The 10 branches around the mold correspond to the position of the slider) to ensure the size of the whole outer circle 46.4. The difficulty of this product is that the size of the 5 groups of blades on the outer edge is all guaranteed to be 46.4+ / -0.05, and the CPK is stable at 1.33 or more. Because the material itself has high glass fiber content, the product made in this way still cannot guarantee the roundness of 46.4, so in actual production, compensation will be made to the mold after the mold is completed according to the actual measurement data to ensure the roundness of the whole outer circle, that is, to ensure the overall stability of 46.4.

[0078] In addition, the product height size 5.67+ / -0.05 is also a difficulty of this product, see Figure 7 Due to the structure of the product, the structure needs to be disassembled into parts, which may cause gas trapping problems. In order to solve the gas trapping problem, the present application makes a reduction of iron on the corresponding outer side of the mold to ensure the smooth exhaust of gas during injection molding, which can ensure the stability of the injection molded product, see Figure 8 , Figure 8 The ladder-shaped structure is formed on the blades around the heat dissipation piece in the figure, that is, the gas trapping problem is solved by reducing the material.

[0079] ​In an embodiment, the motor heat sink 300 is a glass fiber reinforced PPS heat sink. As an important component of high-speed motor, the material needs to be determined by considering mechanical properties, physical properties, chemical properties and process performance, etc. Through the comparison of various materials, the PPS glass fiber reinforced series plastic raw material is finally selected. PPS (polyphenylene sulfide) is a kind of thermoplastic special engineering plastic with excellent comprehensive performance. Its outstanding features are high temperature resistance, corrosion resistance and excellent mechanical properties. Due to the conjugation of benzene ring and the restraint of high crystallinity of sulfur atom, PPS presents non-polar or weak polar characteristics, so the electrical insulation, dielectricity and chemical medium resistance of PPS are also very prominent. PPS has good compatibility with many polymers and additives, and can be modified by various means to improve its mechanical properties and other properties. In this project, 65% glass fiber is added to modify PPS, which can make the plastic deformation smaller, the thermal stability better, the size more stable, and the high temperature resistance up to 265℃.

[0080] In an embodiment, 40% glass fiber can also be added to the PPS material to make the plastic deformation smaller, the thermal stability better, the size more stable, and the high temperature resistance up to 250℃.

[0081] In an embodiment, the material of the mold core of the present application is selected from UNIMAX high-quality mold steel material of Yesheng. This brand of mold steel has good toughness and good thermal strength, good resistance to thermal cracking and overall cracking, and the hardness after heat treatment can reach 58HRC. The melting temperature of PPS with glass fiber during injection molding should be above 300 degrees, which will generate a lot of gas to corrode the mold, and the high content of glass fiber will impact the mold core product during injection molding, which will wear the surface of the mold core. UNIMAX raw material has good corrosion resistance and wear resistance, so this mold core material can effectively resist the erosion of the mold core material during injection molding.

[0082] In summary, the present application provides a mold for manufacturing a motor heat sink, which includes a male mold core, a first mold core core cooperating with the male mold core, a female mold core, and a second mold core core cooperating with the female mold core. The first mold core core and the second mold core core form a molding cavity of the motor heat sink, and the male mold core and the female mold core cooperate to form cooling water channels on the two mold core cores, thereby realizing the cooling molding of the injection molded part. Therefore, the present application realizes the molding of the plastic part by cooperating the mold core core with the male mold core and the female mold core, and replaces the metal part in shape and size. Further, in order to reduce the performance difference between the plastic part and the metal part, the present application uses PPS glass fiber reinforced series plastic raw material, and adds 65% glass fiber to PPS (polyphenylene sulfide) to modify it, which can make the plastic deformation smaller, the thermal stability better, the size more stable, and the high temperature resistance up to 265℃.

[0083] Further, the mold for manufacturing the motor heat dissipation piece provided by the application is provided with an annular water channel, and sealing rings are arranged on the upper and lower sides of the water channel. The annular water channel can ensure that the product is uniformly heated, and prevents the product from being unevenly heated to cause the roundness of the product to be poor and affect use when injection molding.

[0084] Embodiment 2

[0085] Based on the above mold, the application provides a method for manufacturing the motor heat dissipation piece 300 using the mold, which comprises the following steps:

[0086] The first mold core 120 is installed on the male mold core 110, the second mold core 140 is installed on the female mold core 130, and then the first mold core 120 and the second mold core 140 are oppositely installed, so that the gap between the first mold core 120 and the second mold core 140 forms a body forming mold cavity 160 of a preformed motor heat dissipation piece 300;

[0087] The blade forming block 150 is installed in the gap between the male mold core 110 and the female mold core 130, so that the blade forming cavity 151 on the blade forming block 150 is in communication with the body forming mold cavity 160, and the blade forming cavity 151 realizes the forming of the heat dissipation fins 320 of the preformed motor heat dissipation piece 300;

[0088] Cooling water is respectively introduced into the first cooling water channel 121 on the first mold core 120 and the second cooling water channel 141 on the second mold core 140;

[0089] Material is injected into the body forming mold cavity 160 through the three glue injection holes 170 on the first mold core 120 or the second mold core 140, the material flows from the body forming mold cavity 160 to the blade forming cavity 151, and the first cooling water channel 121 and the second cooling water channel 141 realize the cooling and shaping of the material in the body forming mold cavity 160 and the blade forming cavity 151;

[0090] A heat shield 200 is arranged on the periphery of the male mold core 110 and the female mold core 130.

[0091] Through the manufacturing method, the manufacturing of the precise plastic heat dissipation piece of the high-speed motor for small household appliances can be realized, the plastic piece can replace the metal piece, the production cost of the motor in the market can be reduced, and the user demand can be met.

[0092] Embodiment 3

[0093] Based on the above mold, the application provides a motor heat dissipation piece 300 made by using the above mold for manufacturing the motor heat dissipation piece, which comprises a heat dissipation piece body 310, the heat dissipation piece body 310 is provided with a through hole 311, the through hole 311 forms a mounting hole for connecting the heat dissipation piece body 310 with a driving shaft, and a plurality of heat dissipation fins 320 are uniformly arranged on the side wall of the heat dissipation piece body 310, and the plate surface of the heat dissipation fin 320 forms an angle with the central axis of the through hole 311. For details, see Figure 6 , 7 , Fig. 1 shows a structural schematic diagram of a commonly used motor heat dissipation piece. Of course, in other embodiments, the mold of the application can also be used to manufacture motor heat dissipation pieces of other structures, but it can be expected that the body of the motor heat dissipation piece manufactured must have a through hole, and the body is connected with the driving shaft through the through hole, and the outer wall of the body must also have heat dissipation fins, therefore, the structure of the mold of the application can meet the molding of the basic structure of the heat dissipation piece of any structure, and it is suitable for processing motor heat dissipation pieces of any structure.

[0094] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0095] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the application, and those skilled in the art can make changes, modifications and variations to the above embodiments within the scope of the application.

Claims

1. A mold for making a heat sink for an electric machine, characterized in that, It comprises a male die, a first die core cooperating with the male die, a female die, a blade forming block and a second die core cooperating with the female die, wherein: The male die has a first accommodating cavity, the first die core is accommodated in the first accommodating cavity, a groove is arranged on the side wall of the first die core, and the groove forms a first cooling water channel relative to the inner wall of the first accommodating cavity; The female die has a second accommodating cavity, the second die core is accommodated in the second accommodating cavity, a groove is arranged on the side wall of the second die core, and the groove forms a second cooling water channel relative to the inner wall of the second accommodating cavity; One end of the first die core is opposite to one end of the second die core, and the end of the first die core and the end of the second die core have a gap, and the gap forms a forming die cavity of the motor heat sink; A groove and a forming surface are arranged on the end face of the first die core, the groove is arranged at the center of the end face, and the forming surface is arranged around the end face; A protrusion and a forming surface are arranged on the end face of the second die core, the protrusion is arranged at the center of the end face, and the shape and size of the protrusion are matched with the groove of the first die core respectively; The forming surface of the second die core is arranged opposite to the forming surface of the first die core to form a body forming die cavity of the motor heat sink; The first cooling water channel and the second cooling water channel are arranged on the two sides of the forming die cavity respectively, and the first cooling water channel and the second cooling water channel form annular cooling water channels respectively; The upper and lower sides of the groove of the first die core forming the first cooling water channel are respectively provided with an annular groove, and a sealing ring is arranged in the annular groove, so that the first cooling water channel is sealed; The upper and lower sides of the groove of the second die core forming the second cooling water channel are respectively provided with an annular groove, and a sealing ring is arranged in the annular groove, so that the second cooling water channel is sealed; The blade forming block has a blade forming cavity matched with the fins of the motor heat sink; the male die and the female die are arranged opposite to each other, the blade forming block is arranged in the space between the male die and the female die, the side wall of the blade forming block abuts against the abutting position of the first die core and the second die core, and the fins of the motor heat sink in the forming die cavity are formed by the blade forming cavity of the blade forming block; The first cooling water channel and the second cooling water channel realize cooling forming of the pre-formed motor heat sink in the body forming die cavity and the blade forming cavity.

2. The mold for producing a motor heat sink according to claim 1, wherein The shape and size of the forming surface are matched with the shape and size of one side surface of the pre-formed motor heat sink respectively. The forming surface of the second core is arranged opposite to the forming surface of the first core, and a ring of the forming surface of the second core is arranged around the end surface of the second core. The shape and size of the forming surface of the second core are matched with the shape and size of the other side surface of the preformed motor heat sink.

3. The motor heat sink forming die according to claim 2, characterized in that, The first core or the second core is provided with glue feeding holes, and the material flows from the glue feeding holes to the body forming die cavity and then to the blade forming cavity of the blade forming block. The body forming die cavity and the blade forming cavity jointly form the motor heat sink.

4. The motor heat sink forming die according to claim 3, characterized in that, The glue feeding holes include three holes which are uniformly arranged on the end of the first core or the second core close to the body forming die cavity. The motor heat sink is a glass fiber polyphenylene sulfide heat sink.

5. The mold for manufacturing a heat sink of an electric machine according to claim 1, wherein The heat shield includes a plurality of heat insulation plates, and the heat shield is arranged on the periphery of the male core and the female core. The first core and the second core are provided with exhaust gaps, and the blade forming block is provided with exhaust gaps between the first core and the second core.

6. A method of making a heat sink for an electric machine using the mold of claim 5, wherein, The method comprises the following steps: The first core is installed on the male core, the second core is installed on the female core, and the first core and the second core are oppositely installed, so that the gap between the first core and the second core forms a body forming die cavity of a preformed motor heat sink; The blade forming block is installed in the gap between the male core and the female core, so that the blade forming cavity on the blade forming block is connected with the body forming die cavity, and the blade forming cavity realizes the forming of the heat sink fins of the preformed motor heat sink; Cooling water is respectively introduced into the first cooling water channel on the first core and the second cooling water channel on the second core; Material is injected into the body forming die cavity through the three glue feeding holes on the first core or the second core, the material flows from the body forming die cavity to the blade forming cavity, and the first cooling water channel and the second cooling water channel realize the cooling and shaping of the material in the body forming die cavity and the blade forming cavity; The heat shield is arranged on the periphery of the male core and the female core.

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