Carbon fiber motor sheath forming die and forming method

Abstract

The invention discloses a carbon fiber motor sheath forming mold and a forming method. The carbon fiber motor sheath forming mold comprises a silica gel forming mold, a pre-forming mold and a motor sheath hot-press forming mold, the silica gel mold is formed in the silica gel forming mold, then the silica gel mold and the carbon fiber preform are preformed on the preform mold, and finally the preformed combination is put into a hot-pressing mold together to be subjected to hot-pressing curing to form the carbon fiber motor sheath. The silica gel mould pressing process adopted by the invention effectively improves the influence of the traditional forming process on the appearance, and ensures that the appearance quality of the finished product is higher; and the carbon fiber prepreg serving as the appearance layer is stressed more uniformly in the forming process, so that the visual effect and the surface smoothness of the decorative part are improved. Through the temperature system, the air exhausting system and the air blowing system, accurate control over the temperature of the mold is achieved, deformation, defects and bubbles of a finished product are reduced, and the internal quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber product forming, in particular to a carbon fiber motor sheath forming die and forming method. BACKGROUND

[0002] The commonly used motor sealing structure currently is to add an isolation sleeve in the air gap between the motor stator and the rotor, the two end faces of the isolation sleeve directly abut against the end covers on both sides of the motor, and the sealing between the contact surfaces and the fixing of the two contact pieces are realized through the o-shaped sealing ring or the form of glue joint. However, since the thickness of the isolation sleeve cannot be too thin in order to ensure the sealing reliability and the isolation sleeve needs to reliably bear the weight of the cooling oil and some impact during the operation of the motor, the normal rotation of the motor rotor may be interfered, and thus the motor air gap is often additionally increased, thereby reducing the motor magnetic load, and further leading to the reduction of the motor power density and torque density.

[0003] The traditional motor sheath has problems of large weight, poor impact resistance and the like, and it is difficult to meet the needs of automobile lightweight, performance improvement and aestheticization. In order to solve these problems, more and more automobile manufacturers begin to use composite materials such as carbon fiber to manufacture motor sheaths.

[0004] Therefore, it has important practical significance and market demand to develop a high-efficiency and precise carbon fiber motor sheath forming die and forming method. SUMMARY

[0005] The present application aims to provide a carbon fiber motor sheath forming die and forming method, which realizes the rapid, efficient and stable production of carbon fiber motor sheaths by optimizing the die structure and forming process.

[0006] To solve the above technical problems, the present application provides a silica gel forming die, comprising a silica gel upper die, a silica gel lower die and a glue injection port. The silica gel upper die and the silica gel lower die form a silica gel forming cavity between them after being closed. The glue injection port is detachably installed on the silica gel upper die and is in communication with the silica gel forming cavity through the flow channel in the silica gel upper die. Liquid silica gel enters the silica gel forming cavity through the glue injection port and the flow channel after solidification to form a silica gel mold.

[0007] Preferably, the silica gel upper die is a male die, and the silica gel lower die is a female die. After being closed, a silica gel forming cavity is formed between the two.

[0008] The present application also provides a preform die, comprising a preform die body, a silica gel mold placed on the surface of the preform die body, and a motor sheath pre-preg laid on the surface of the silica gel mold, thereby forming a preform.

[0009] Preferably, the preform mold body is a male mold, and an adsorption groove is provided on the top surface of the preform mold body. A negative pressure connector is provided on one side, and the negative pressure connector is connected to the adsorption groove through a negative pressure flow channel opened inside the preform mold body.

[0010] The present invention also provides a hot pressing mold for carbon fiber motor sheath, including a hot pressing upper mold and a hot pressing lower mold. The lower seat of the hot pressing lower mold is fixed to the ground to provide overall support. The upper seat of the hot pressing upper mold is connected to a press and, under the action of the press, separates and joins with the hot pressing lower mold. The lower hot-press mold has a corresponding lower mold cavity for placing the preform and the silicone mold. The upper mold cavity of the upper hot-press mold and the lower mold cavity of the lower hot-press mold are machined with grooves and protrusions to form the inner and outer structures of the motor sheath.

[0011] Preferably, the hot press mold further includes an exhaust system, which includes an exhaust channel opened in the lower hot press mold. One end of the exhaust channel extends into the lower mold cavity, and the other end extends into a vacuum connector located outside the lower hot press mold. The vacuum connector is connected to an external vacuum pumping device, which is connected to the vacuum connector through a vacuum pumping pipe. The vacuum pumping device exhausts the gas generated in the mold cavity and during the heating process of the prepreg by vacuuming, so that the upper mold cavity and the lower mold cavity are in a sealed state after the mold is closed.

[0012] Preferably, the hot press mold further includes an air blowing system, which includes an air blowing channel opened in the upper hot press mold, one end of the air blowing channel extending into the lower mold cavity and the other end extending into an air pressure connector outside the upper hot press mold; The other end of the air compressor connector is connected to an air compressor device, which is connected to the air compressor connector through an air compressor pipeline for pressurizing the silicone mold and preform in the lower mold cavity. A pressure gauge is provided on one side of the air compressor connector to monitor the pressurization pressure.

[0013] Preferably, the hot press mold further includes a heating system, which includes a circulating heating channel opened in the lower hot press mold. One end of the circulating heating channel is an oil inlet connector, and the other end is an oil outlet connector. Heating oil is circulated through an external heating device to control the temperature of the lower mold cavity.

[0014] Preferably, the hot pressing mold further includes a temperature detection system, which includes a temperature measuring thermocouple disposed in the lower hot pressing mold. The temperature measuring thermocouple extends from one side of the lower hot pressing mold to the vicinity of the lower mold cavity and is used to monitor the temperature of the lower mold cavity. The hot-pressing lower mold is also equipped with a temperature control connector, which converts the temperature signal of the temperature measuring thermocouple into an electrical signal output.

[0015] The present invention also provides a method for molding a carbon fiber motor sheath, comprising the following steps: Step A: Molding the silicone mold; Step A1: Place a layer of release cloth inside the silicone molding cavity of the upper and lower silicone molds respectively, and brush release agent evenly on it; Step A2: Next, close and lock the upper and lower silicone molds together; Step A3: Then place the silicone molding mold on the vibration platform, and pour liquid silicone into the silicone molding cavity from the injection port; Step A4: After the silicone has cured, remove the molded silicone mold from the silicone molding cavity; Step B: Forming the preform; Step B1: First, lay a layer of release cloth on the pre-molded mold body and the silicone mold, and then brush on the release agent evenly; Step B2: Next, place the silicone mold on the pre-molding mold body and turn on the vacuum suction to adsorb and fix the silicone mold on the pre-molding mold body; Step B3: Then lay the fiberglass sacrificial layer on the silicone mold. Multiple fiberglass sacrificial layer sheets are laid on the surface of the silicone mold in sequence. When laying, two fiberglass sacrificial layer sheets are glued together. The sheets are laid with an overlap method and rotated 5-10° with the previous layer. Step B4: Next, lay the fiberglass layer on the fiberglass sacrificial layer. Multiple fiberglass sheet components are laid sequentially on the surface of the fiberglass sacrificial layer. When laying, two fiberglass sheet components are glued together. The sheet components are laid with an overlap method and rotated 5-10° with the previous layer. Step B5: Then lay the carbon fiber layer on the fiberglass layer. Multiple carbon fiber sheet pieces are laid on the surface of the fiberglass layer in sequence. When laying, two carbon fiber sheet pieces are glued together. The sheet pieces are laid with an overlap method and rotated 5-10° with the previous layer. Step B6: After the paving is completed, the bag needs to be sealed and pre-extracted for 5-10 minutes, with a pre-extraction pressure ≤ -0.075Mpa; Step B7: Finally, remove the silicone mold and the preform composed of the glass fiber sacrificial layer, glass fiber layer and carbon fiber layer from the preform mold body for later use; Step C: Hot pressing of the motor sheath; Step C1: First, the heated oil is circulated back and forth into the circulating heating channel through an external heating device to heat the hot press mold until it reaches the rated molding temperature. During the heating process, the temperature of the lower mold is monitored by a thermocouple and the data is fed back to the press's central control system and the heating device in the heating system to adjust the temperature of the heating oil. Step C2: Next, place the silicone mold and preform into the lower mold cavity of the hot press mold; Step C3: Then start the press, and the hot-press upper mold and hot-press lower mold are closed to press the preform into the sealed cavity formed by the silicone mold and the lower mold cavity; Step C4: Next, air pressure is continuously applied to the sealed cavity formed by the silicone mold and the upper mold cavity through the air blowing system; Step C5: Then, the gas in the sealed cavity formed by the silicone mold and the lower mold cavity, as well as the gas generated by the preform during the heating process, are continuously extracted by the vacuum system; Step C6: Under the combined effects of temperature and pressure, the carbon fiber motor sheath is formed after a period of heat and pressure maintenance. Step C7: Finally, the upper mold rises under hot pressing, and the carbon fiber motor sheath wraps around the silicone mold and stays in the lower mold cavity. The ejector rod pushes out the carbon fiber motor sheath and the silicone mold, demolding and removing the complete carbon fiber motor sheath.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves rapid, efficient, and stable production of carbon fiber motor sheaths by optimizing the mold structure and molding process. The silicone mold is formed first, followed by the carbon fiber motor sheath. During the hot pressing stage, the silicone mold is placed on the inner wall of the motor sheath, thereby avoiding the appearance being affected by pressure and heat, and improving the appearance quality and consistency of the product. 2. The silicone molding process used in this invention effectively improves the impact of traditional molding processes on appearance, ensuring higher quality finished products. Furthermore, the carbon fiber prepreg, used as the outer layer, experiences more uniform stress during molding, enhancing the visual appeal and surface finish of the decorative parts. Precise control of the mold temperature is achieved through temperature, exhaust, and blowing systems, reducing deformation, defects, and bubbles in the finished product and ensuring internal quality. 3. The hot pressing mold of the present invention is equipped with a heating, exhaust and blowing system, which realizes precise control of mold temperature and pressure, reduces deformation, defects and bubbles in carbon fiber motor sheath, and ensures the internal quality of carbon fiber motor sheath. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the silicone molding die provided by the present invention; Figure 2 This is a cross-sectional view of the silicone molding die provided by the present invention; Figure 3 This is a schematic diagram of the structure of the silicone mold provided by the present invention; Figure 4 This is a schematic diagram of the preform mold provided by the present invention; Figure 5This is a top view of the preform mold provided by the present invention; Figure 6 This is a first-view structural schematic diagram of the carbon fiber motor sheath hot pressing mold provided by the present invention; Figure 7 This is a second-view structural schematic diagram of the carbon fiber motor sheath hot pressing mold provided by the present invention; Figure 8 This is a left view of the hot pressing mold for carbon fiber motor sheath provided by the present invention; Figure 9 This is a right view of the hot pressing mold for carbon fiber motor sheath provided by the present invention; Figure 10 This is a top view of the carbon fiber motor sheath hot pressing mold provided by the present invention; Figure 11 yes Figure 10 Sectional view at point AA; Figure 12 yes Figure 10 Sectional view at point BB.

[0018] In the diagram: 10. Silicone upper mold; 20. Silicone lower mold; 30. Injection port; 40. Silicone mold; 100. Pre-molded mold body; 200. Adsorption tank; 300. Negative pressure connector; 400. Negative pressure flow channel; 1. Hot-press upper mold; 2. Hot-press lower mold; 3. Exhaust channel; 4. Hydraulic connector; 5. Hydraulic cylinder; 6. Air blowing channel; 7. Air pressure connector; 8. Pressure gauge; 11. Circulating heating flow channel; 12. Oil inlet connector; 13. Oil outlet connector; 14. Temperature measuring thermocouple; 15. Temperature control connector; 16. Ejector rod. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element 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 invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In addition, the features, operations, and characteristics described in the specification can be combined in any suitable manner to form various embodiments. Similarly, the steps or actions described in the method can be rearranged in a manner that is readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the purpose of clearly describing a particular embodiment and are not necessarily required orders, unless otherwise stated that a particular order must be followed. Example

[0023] This invention provides a silicone molding die; please refer to [link / reference]. Figures 1-3 It includes a silicone upper mold 10, a silicone lower mold 20, and a glue injection port 30; after the silicone upper mold 10 and the silicone lower mold 20 are closed, a silicone molding cavity is formed between them; The injection port 30 is detachably installed on the upper silicone mold 10 and is connected to the silicone molding cavity through the flow channel inside the upper silicone mold 10. Liquid silicone enters through the injection port 30, flows into the silicone molding cavity through the flow channel, and is cured to form the silicone mold 40.

[0024] Specifically, the upper silicone mold 10 is a male mold, and the lower silicone mold 20 is a female mold; after the molds are closed, a silicone molding cavity is formed between them.

[0025] The present invention also provides a preform mold, please refer to [link / reference]. Figure 4 and Figure 5 The preform includes a preform mold body 100, on which a silicone mold 40 is placed and a motor sheath prepreg is laid on the surface of the silicone mold 40, thereby forming a preform.

[0026] Specifically, the preform mold body 100 is a male mold, and an adsorption groove 200 is provided on the top surface of the preform mold body 100. A negative pressure connector 300 is provided on one side. The negative pressure connector 300 is connected to the adsorption groove 200 through a negative pressure flow channel 400 opened inside the preform mold body 100.

[0027] This invention also provides a hot pressing mold for carbon fiber motor sheaths; please refer to [link / reference]. Figure 6 and Figure 7The device includes a hot-pressing upper mold 1 and a hot-pressing lower mold 2. The lower base of the hot-pressing lower mold 2 is fixed to the ground to provide overall support. The upper base of the hot-pressing upper mold 1 is connected to a press and, under the action of the press, it separates and joins with the hot-pressing lower mold 2. The hot-pressing lower mold 2 has a corresponding lower mold cavity for placing the preform and the silicone mold. The upper mold cavity of the hot-pressing upper mold 1 and the lower mold cavity of the hot-pressing lower mold 2 are machined with grooves and protrusions to form the inner and outer structures of the motor sheath.

[0028] For details, please refer to Figures 8-11 The hot press mold also includes an exhaust system, which includes an exhaust channel 3 opened in the lower hot press mold 2. One end of the exhaust channel 3 extends into the lower mold cavity, and the other end extends to a vacuum connector located outside the lower hot press mold 2. The vacuum connector is connected to an external vacuum pumping device. The vacuum pumping device is connected to the vacuum connector through a vacuum pumping pipe. The gas generated in the mold cavity and during the heating process of the prepreg is discharged by vacuum pumping, so that the upper mold cavity and the lower mold cavity are in a sealed state after the mold is closed.

[0029] For details, please refer to the following: Figure 12 The hot press mold also includes an air blowing system, which includes an air blowing channel 6 opened in the upper hot press mold 1. One end of the air blowing channel 6 extends into the lower mold cavity, and the other end extends into the outside of the upper hot press mold 1. The other end of the air blowing channel 6 is connected to an air compressor, which is connected to the air compressor 7 through an air compressor pipe for pressurizing the silicone mold and preform in the lower mold cavity. A pressure gauge 8 is provided on one side of the air compressor 7 to monitor the pressurization pressure.

[0030] Specifically, the hot press mold also includes a heating system, which includes a circulating heating channel 11 opened in the lower hot press mold 2. One end of the circulating heating channel 11 is an oil inlet connector 12, and the other end is an oil outlet connector 13. Heating oil is circulated through an external heating device to control the temperature of the lower mold cavity.

[0031] In this embodiment, in order to achieve rapid heating of the lower mold cavity, the circulating heating channel 11 is provided in two sets, and two sets of oil inlet connectors 12 and oil outlet connectors 13 are also configured. The two sets of circulating heating channels 11 are laid below the lower mold cavity, and the external heating device circulates heating oil to heat the silicone mold and preform in the lower mold cavity.

[0032] Specifically, the hot pressing mold also includes a temperature detection system, which includes a temperature measuring thermocouple 14 installed in the lower hot pressing mold 2. The temperature measuring thermocouple 14 extends from one side of the lower hot pressing mold 2 to the vicinity of the lower mold cavity and is used to monitor the temperature of the lower mold cavity. The lower hot pressing mold 2 is also provided with a temperature control connector 15, which converts the temperature signal of the temperature measuring thermocouple 14 into an electrical signal output.

[0033] In this embodiment, multiple push rods 16 are provided below the hot-pressing lower mold 2. One end of each push rod 16 is installed on the same lifting plate, and the other end extends through the hot-pressing lower mold 2 into the lower mold cavity. Under the action of the push rods 16, the silicone mold and the preform are ejected from the lower mold cavity.

[0034] Furthermore, the hot-pressing lower mold 2 is provided with a hydraulic connector 4, which is connected to a hydraulic cylinder 5 through a hydraulic pipe. Under the action of the hydraulic cylinder 5, the push rod 16 is driven to lift.

[0035] The present invention also provides a method for molding a carbon fiber motor sheath, comprising the following steps: Step A: Molding of silicone mold 40; Step A1: Place a layer of release cloth inside the silicone molding cavity of the upper silicone mold 10 and the lower silicone mold 20 respectively, and brush release agent evenly on it; Step A2: Next, close and lock the upper silicone mold 10 and the lower silicone mold 20 together; Step A3: Then place the silicone molding mold on the vibration platform, and pour liquid silicone into the silicone molding cavity from the injection port 30; Step A4: After the silicone has cured, remove the molded silicone mold 40 from the silicone molding cavity; Step B: Forming the preform; Step B1: First, lay a layer of release cloth on the pre-molded mold body 100 and the silicone mold 40, and brush release agent evenly on it; Step B2: Next, place the silicone mold 40 on the pre-molded mold body 100, and turn on the vacuum adsorption to adsorb and fix the silicone mold 40 on the pre-molded mold body 100. Step B3: Then, lay the fiberglass sacrificial layer on the silicone mold 40. Multiple fiberglass sacrificial layer sheets are laid sequentially on the surface of the silicone mold 40. When laying, two fiberglass sacrificial layer sheets are glued together. The sheets are laid with an overlap and rotated 5-10° with the previous layer. Step B4: Next, lay the fiberglass layer on the fiberglass sacrificial layer. Multiple fiberglass sheet components are laid sequentially on the surface of the fiberglass sacrificial layer. When laying, two fiberglass sheet components are glued together. The sheet components are laid with an overlap method and rotated 5-10° with the previous layer. Step B5: Then lay the carbon fiber layer on the fiberglass layer. Multiple carbon fiber sheet pieces are laid on the surface of the fiberglass layer in sequence. When laying, two carbon fiber sheet pieces are glued together. The sheet pieces are laid with an overlap method and rotated 5-10° with the previous layer. Step B6: After the paving is completed, the bag needs to be sealed and pre-extracted for 5-10 minutes, with a pre-extraction pressure ≤ -0.075Mpa; Step B7: Finally, remove the silicone mold 40 and the preform composed of the glass fiber sacrificial layer, glass fiber layer and carbon fiber layer from the preform mold body 100 for later use; Step C: Hot pressing of the motor sheath; Step C1: First, the heated oil is circulated back and forth into the circulating heating channel 11 through an external heating device to heat the hot press mold until it reaches the rated molding temperature. During the heating process, the temperature of the lower hot press mold 2 is monitored by the temperature measuring thermocouple 14, and the data is fed back to the central control system of the press and the heating device in the heating system to adjust the temperature of the heating oil. Step C2: Next, place the silicone mold 40 and the preform into the lower mold cavity of the hot-pressing mold 2; Step C3: Then start the press, hot press upper mold 1 and hot press lower mold 2 close the mold, and press the preform into the closed cavity formed by the silicone mold 40 and the lower mold cavity; Step C4: Next, air pressure is continuously applied to the sealed cavity formed by the silicone mold 40 and the upper mold cavity through the air blowing system; Step C5: Then, the gas in the sealed cavity formed by the silicone mold 40 and the lower mold cavity, as well as the gas generated by the preform during the heating process, are continuously extracted by the vacuum system. Step C6: Under the combined effects of temperature and pressure, the carbon fiber motor sheath is formed after a period of heat and pressure maintenance. Step C7: Finally, the upper mold 1 is raised by hot pressing, and the carbon fiber motor sleeve wraps around the silicone mold 40 and stays in the lower mold cavity. The ejector rod pushes out the carbon fiber motor sleeve and the silicone mold 40, demolding and taking out the complete carbon fiber motor sleeve.

[0036] The silicone molding process employed in this invention effectively mitigates the impact of traditional molding processes on appearance, ensuring higher quality finished products. Furthermore, the carbon fiber prepreg, serving as the outer layer, experiences more uniform stress during molding, enhancing the visual appeal and surface smoothness of the decorative parts. Precise temperature control of the mold is achieved through temperature, venting, and blowing systems, reducing deformation, defects, and air bubbles in the finished product and guaranteeing internal quality.

[0037] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A silicone gel forming mold characterized by, It comprises a silica gel upper die (10), a silica gel lower die (20) and a glue injection port (30); After the silica gel upper die (10) and the silica gel lower die (20) are closed, a silica gel forming cavity is formed between them; The glue injection port (30) is detachably installed on the silica gel upper die (10) and communicates with the silica gel forming cavity through a flow channel in the silica gel upper die (10). Liquid silica gel enters the silica gel forming cavity through the glue injection port (30) and the flow channel and forms a silica gel mold (40) after solidification.

2. A silicone molding die as claimed in claim 1, wherein, The silica gel upper die (10) is a male die and the silica gel lower die (20) is a female die. After the two dies are closed, a silica gel forming cavity is formed between them.

3. A preform mold characterized by, It comprises a pre-mold body (100), the surface of which is placed with a silica gel mold (40), and a motor sheath pre-preg is laid on the surface of the silica gel mold (40), thereby forming a pre-form.

4. A preform according to claim 3, wherein The pre-mold body (100) is a male die, an adsorption groove (200) is formed on the top surface of the pre-mold body (100), and a negative pressure connector (300) is arranged on one side, which communicates with the adsorption groove (200) through a negative pressure flow channel (400) formed in the pre-mold body (100).

5. A carbon fiber motor jacket hot press mold characterized by, It comprises a hot-pressing upper die (1) and a hot-pressing lower die (2), the lower seat of the hot-pressing lower die (2) is fixed to the ground to provide overall support, and the upper seat of the hot-pressing upper die (1) is connected to a press and is separated from or combined with the hot-pressing lower die (2) under the action of the press. A corresponding lower die cavity is formed in the hot-pressing lower die (2) for placing a pre-form and a silica gel mold, and a recess and a protruding structure are formed inside the upper die cavity of the hot-pressing upper die (1) and the lower die cavity of the hot-pressing lower die (2) for forming the internal and external structures of the motor sheath.

6. A carbon fibre motor jacket hot press mould as claimed in claim 5, characterised in that, It further comprises an exhaust system, which comprises an exhaust passage (3) formed in the hot-pressing lower die (2), one end of the exhaust passage (3) extending into the lower die cavity, the other end extending to a vacuum connector outside the hot-pressing lower die (2) and being connected to an external vacuumizing device through the vacuum connector, the vacuumizing device being connected to the vacuum connector through a vacuumizing pipeline to exhaust the gas generated in the die cavity and the pre-preg during heating, so that the upper die cavity and the lower die cavity after being closed are in a sealed state.

7. A carbon fiber motor jacket hot press mold as defined in claim 5, wherein, It further comprises a gas blowing system, which comprises a gas blowing passage (6) formed in the hot-pressing upper die (1), one end of the gas blowing passage (6) extending into the lower die cavity and the other end extending to an air pressure connector (7) outside the hot-pressing upper die (1). The other end of the air pressure connector (7) is connected to an air pressure device, the air pressure device being connected to the air pressure connector (7) through an air pressure pipeline to pressurize the silica gel mold and the pre-form in the lower die cavity. A pressure gauge (8) is arranged on one side of the air pressure connector (7) to monitor the pressure.

8. A carbon fiber motor jacket hot press mold as defined in claim 5, wherein, Further comprising a heating system, the heating system comprises a circulating heating flow channel (11) opened in the hot pressing lower die (2), one end of the circulating heating flow channel (11) is an oil inlet joint (12), the other end is an oil outlet joint (13), through the circulating heating oil of external heating device, the temperature of the lower die cavity is controlled.

9. A carbon fiber motor jacket hot press mold as defined in claim 5, wherein, Further comprising a temperature detection system, the temperature detection system comprises a temperature measuring thermocouple (14) arranged in the hot pressing lower die (2), the temperature measuring thermocouple (14) extends from one side of the hot pressing lower die (2) to the vicinity of the lower die cavity, for monitoring the temperature of the lower die cavity; The hot pressing lower die (2) is further provided with a temperature control joint (15), the temperature signal of the temperature measuring thermocouple (14) is converted into an electric signal output through the temperature control joint (15).

10. A method of forming a carbon fiber motor jacket, characterized by, The method comprises the following steps: Step A: forming of the silica gel mold (40); Step A1: a layer of release cloth is laid in the silica gel forming cavity of the silica gel upper mold (10) and the silica gel lower mold (20) respectively, and release agent is uniformly brushed thereon; Step A2: then the silica gel upper mold (10) and the silica gel lower mold (20) are closed and locked; Step A3: then the silica gel forming mold is placed on a vibration platform, and liquid silica gel is poured into the silica gel forming cavity from the glue injection port (30); Step A4: after the silica gel is solidified, the formed silica gel mold (40) is taken out from the silica gel forming cavity; Step B: forming of the preform; Step B1: first, a layer of release cloth is laid on the preform body (100) and the silica gel mold (40), and release agent is uniformly brushed thereon; Step B2: then the silica gel mold (40) is placed on the preform body (100), and the vacuum suction is turned on to fix the silica gel mold (40) on the preform body (100); Step B3: then a glass fiber sacrificial layer is laid on the silica gel mold (40), and multiple pieces of glass fiber sacrificial layer are laid on the surface of the silica gel mold (40) in turn, two pieces of glass fiber sacrificial layer are laid together during laying, and the pieces are laid in a lap joint manner with a rotation angle of 5-10° with the previous layer; Step B4: then a glass fiber layer is laid on the glass fiber sacrificial layer, and multiple pieces of glass fiber layer are laid on the surface of the glass fiber sacrificial layer in turn, two pieces of glass fiber layer are laid together during laying, and the pieces are laid in a lap joint manner with a rotation angle of 5-10° with the previous layer; Step B5: then a carbon fiber layer is laid on the glass fiber layer, and multiple pieces of carbon fiber layer are laid on the surface of the glass fiber layer in turn, two pieces of carbon fiber layer are laid together during laying, and the pieces are laid in a lap joint manner with a rotation angle of 5-10° with the previous layer; Step B6: after the laying is completed, the bag needs to be sealed, and pre-evacuation is needed for 5-10 minutes, and the pre-evacuation pressure is less than or equal to-0.075Mpa; Step B7: finally, the silica gel mold (40) and the preform composed of the glass fiber sacrificial layer, the glass fiber layer and the carbon fiber layer are taken off from the preform body (100) at the same time for standby; Step C: hot pressing forming of the motor sheath; Step C1: First, the heated oil is circulated into the circulating heating channel (11) by external heating device to heat the hot-pressing mold until it reaches the rated molding temperature; during the heating process, the temperature of the hot-pressing lower mold (2) is monitored by the temperature measuring thermocouple (14), and the data is fed back to the central control system of the press and the heating device in the heating system to adjust the temperature of the heating oil; Step C2: Then place the silica gel mold (40) and the preform in the lower mold cavity of the hot-pressing lower mold (2); Step C3: Then start the press, and the hot-pressing upper mold (1) and the hot-pressing lower mold (2) are closed to press the preform in the closed cavity formed by the silica gel mold (40) and the lower mold cavity; Step C4: Then continuously apply air pressure to the closed cavity formed by the silica gel mold (40) and the upper mold cavity through the air blowing system; Step C5: Then continuously extract the gas in the closed cavity formed by the silica gel mold (40) and the lower mold cavity and the gas generated by the preform during the heating process through the vacuum pumping system; Step C6: Under the action of temperature and pressure, the carbon fiber motor sheath is formed after a period of heat preservation and pressure preservation; Step C7: Finally, the hot-pressing upper mold (1) rises, and the carbon fiber motor sheath wrapped around the silica gel mold (40) stays in the lower mold cavity, and the carbon fiber motor sheath and the silica gel mold (40) are ejected by the ejector rod, demolded, and the complete carbon fiber motor sheath is taken out.

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