CN215998657U

CN215998657U - Low-pressure casting die for motor end cover of new energy automobile

Info

Publication number: CN215998657U
Application number: CN202023258816.4U
Authority: CN
Inventors: 张花蕊; 张虎; 贵菁
Original assignee: Beijing Hangda New Material Technology Co ltd; Zhucheng Hangda New Material Technology Co ltd; Qingdao Research Institute Of Beihang University
Current assignee: Beijing Hangda New Material Technology Co ltd; Zhucheng Hangda New Material Technology Co ltd; Qingdao Research Institute Of Beihang University
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2022-03-11
Anticipated expiration: 2030-12-29

Abstract

The utility model relates to a low-pressure casting die for a motor end cover of a new energy automobile, which comprises an upper die and a lower die, wherein a plurality of pouring gates are arranged on the lower die along the circumferential direction, and the pouring gates are correspondingly arranged at the bottom of a cavity at the outer edge part of the end cover in the lower die. The utility model can reduce the casting defect of the end cover with thick outer edge and obviously improve the product quality.

Description

Low-pressure casting die for motor end cover of new energy automobile

Technical Field

The utility model relates to the field of casting, in particular to a low-pressure casting die for a motor end cover of a new energy automobile.

Background

The motor end cover is a cover at two ends of a motor shell and generally comprises a front end cover and a rear end cover, and the end covers are fixed on the base in a screw or riveting mode and play a role in supporting and protecting a motor rotor. The motor end cover has a complex appearance structure, and a plurality of concave-convex structures are designed on the end face to enhance heat dissipation and improve mechanical strength. The motor end cover is mostly made of cast iron in the past, and along with the requirement of light weight, the cast iron part is gradually replaced by aluminum alloy. At present, most of aluminum alloy motor end covers are produced by adopting a mode of casting and molding firstly and then machining.

The inventor finds that in actual production, for a type of end cover with a thicker outer edge part, such as the end cover shown in fig. 1, a conventional low-pressure casting mold is adopted, for example, a mold shown in "a high-precision new energy automobile motor end cover mold" of the chinese utility model with the publication number of CN209565478U, a pouring gate is generally located at the central position of the end cover, and a cast obtained after casting molding can generate more casting defects at the thick position of the outer edge part.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a low-pressure casting die for a motor end cover of a new energy automobile, which can improve the quality of castings, aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a new energy automobile motor end cover low pressure casting mould, includes mould, lower mould, its characterized in that: and a plurality of gates are arranged on the lower die along the circumferential direction, and the gates are correspondingly arranged at the bottom of the cavity at the outer edge part of the end cover in the lower die.

In order to eliminate casting defects and further improve the quality of castings, the pouring gates are uniformly arranged at intervals.

Preferably, the number of the gates is three.

Because the structure of the transmission shaft installation part of the end cover is relatively complicated, in order to save cost, the upper die comprises an upper die main body and an upper die core which is arranged in a split manner and used for forming the transmission shaft installation part of the end cover. The upper mold core and the upper mold main body are arranged in a split mode, the upper mold core can be machined independently, the upper mold core is convenient to replace after being worn, and cost is reduced.

In order to prevent the upper mold core from moving upward, a pressing plate for preventing the upper mold core from moving upward is mounted on the upper mold.

To prevent interference with the ejector pin, the pressing plate is arc-shaped.

In order to better mold the junction box part with a complex structure, the upper die is provided with an insert for molding the junction box part of the end cover.

In order to install the steel sleeve before casting, a boss for installing the steel sleeve of the motor bearing chamber is formed on the upper mold core.

In order to prevent the steel sleeve from being separated from the end cover when the ejector pins are demolded, a plurality of first ejector pin holes are formed in the upper die core along the outer edge of the steel sleeve of the motor bearing chamber, and after the ejector pins penetrate through the first ejector pin holes, the end portions of the ejector pins are in contact with the steel sleeve of the motor bearing chamber, and the end portions of the ejector pins are in contact with the casting portion of the end cover.

In order to better demould, a plurality of second thimble holes are arranged on the upper die along the circumferential direction at positions corresponding to the outer edge part of the end cover.

Compared with the prior art, the utility model has the advantages that: the utility model correspondingly arranges the sprue positions on the end covers with thicker outer edge parts, and adopts targeted feeding on the dispersed heat junctions at the thicker positions to ensure the sequential solidification of the castings, prevent the generation of casting defects and improve the quality of the castings; and the multi-sprue filling efficiency is high, the heat loss in the molten aluminum filling process is small, and the casting forming effect is good.

Drawings

FIG. 1 is a schematic diagram of the general construction of an end cap cast in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view of the general structure of a mold according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a mold according to an embodiment of the present invention;

FIG. 4 is a schematic view of a matching structure of a boss and a steel sleeve of an upper die according to an embodiment of the utility model;

FIG. 5 is a schematic structural view of a gate according to an embodiment of the present invention;

fig. 6 is a schematic view of a matching structure of the upper mold core and the upper mold main body according to the embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.

As shown in fig. 1, the end cap 1 cast for the present embodiment includes an end cap main body portion 11 and a terminal block portion 12, and the end cap main body portion 11 includes a drive shaft mounting portion 111 and an outer edge portion 112 in the middle.

As shown in fig. 2 to 6, the new energy automobile motor end cover low pressure casting mold is a new energy automobile motor end cover low pressure casting mold of the embodiment, and includes an upper mold 2 and a lower mold 3, wherein a plurality of gates 31 are arranged on the lower mold 3 along the circumferential direction, the gates 31 are correspondingly arranged at the bottom of a cavity in the lower mold 3 for forming the outer edge portion of the end cover, and the gates 31 are uniformly spaced for better casting performance. In this embodiment, it is preferable that the number of the gates 31 is three. A ceramic insulating sleeve 311 is provided in each gate 31. The liquid lifting box 4 is arranged below the mold, the three liquid lifting ports which are in one-to-one correspondence with the pouring gates 31 are arranged on the box cover of the liquid lifting box 4, the liquid lifting box 4 is used for lifting liquid instead of a plurality of liquid lifting pipes, the cost is saved, and the risk of poor sealing performance of the structure of the liquid lifting pipes is reduced.

The present embodiment is further provided with a side core pulling mechanism 5 for assisting in molding the terminal box portion 12, the side core pulling mechanism 5 includes a core pulling slider 51, a core pulling connecting rod of the core pulling slider 51 is connected with a driving rod of an oil cylinder 52 through a coupling component, the oil cylinder 52 is installed on a side mold frame 53, and the side mold frame is fixedly connected with the upper mold 2.

Because the structure of the transmission shaft mounting part of the end cover is complex, in order to save cost, the upper die 2 comprises an upper die main body 21 and an upper die core 22 which is arranged in a split manner and used for forming the transmission shaft mounting part of the end cover. The upper die core 22 and the upper die main body 21 are arranged in a split mode, the upper die core 22 can be machined independently, the upper die core 22 is convenient to replace after being worn, and cost is reduced.

Also on the upper die 2 there are inserts 24 for forming the terminal box portion 12 of the end cap.

To prevent the upper core 22 from moving upward, a platen 23 is mounted on the upper die 2. In order to prevent interference with the pins, the pressing plate 23 is formed in an arc shape and is installed at the interface between the upper core 22 and the upper mold body 21. In order to prevent interference between the platen 23 and the insert 24, an opening is provided in the platen 23 at a position corresponding to the mounting position of the insert 24.

For the installation of the front steel jacket 6 during casting, a projection 221 for the mounting of the motor bearing housing steel jacket 6 is formed on the upper mold core 22. In order to prevent the steel sleeve 6 from being separated from the end cover when the thimble is demolded, a plurality of first thimble holes 25 are arranged on the upper mold core 22 along the outer edge of the steel sleeve 6 of the motor bearing chamber, and the first thimble holes 25 are used for enabling the thimble to penetrate through the end part of the rear thimble to be partially contacted with the steel sleeve 6 of the motor bearing chamber and partially contacted with the casting part of the end cover. For better demolding, a plurality of second thimble holes 26 are provided in the upper die 2 in the circumferential direction at positions corresponding to the end cap outer edge portions. The first pinhole 25 and the second pinhole 26 of the present embodiment are uniformly spaced.

When the mold is used for casting, firstly, aluminum liquid in the liquid lifting box is shunted through the three gates 31 and then enters a mold cavity, and mold filling is completed within 6-10 s; then, the aluminum liquid is gradually solidified from the center to the periphery; meanwhile, the three gates continuously provide molten aluminum required by feeding into the cavity, so that the solidification structure of the casting is more compact, and the product quality is improved.

The casting product is sampled in a T6 state of the end cover body by a method in GB/T228.1-2010, the mechanical property of the casting product is detected, and the detection result is shown in Table 1. It can be seen that the mechanical property of the motor end cover cast by the method is obviously improved.

Table 1: mechanical results for castings prepared in this example

The present embodiment uses the mold for casting aluminum alloy, and may be applied to casting other alloys such as copper alloy, cast steel, and cast iron.

The technical means disclosed in the utility model scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims

1. The utility model provides a new energy automobile motor end cover low pressure casting mould, includes mould (2), lower mould (3), its characterized in that: a plurality of gates (31) are arranged on the lower die (3) along the circumferential direction, and the gates (31) are correspondingly arranged at the bottom of a cavity of the outer edge part of the end cover in the lower die (3); the gates (31) are uniformly arranged at intervals; three gates (31); a liquid lifting box (4) is arranged below the mould, and three liquid lifting ports which are in one-to-one correspondence with the pouring gates (31) are arranged on a box cover of the liquid lifting box (4).

2. The new energy automobile motor end cover low pressure casting mould of claim 1, characterized in that: go up mould (2) including last mould main part (21) to and the components of a whole that can function independently setting be used for the shaping last mold core (22) of the transmission shaft installation department of end cover.

3. The new energy automobile motor end cover low pressure casting mould of claim 2, characterized in that: and a pressing plate (23) for preventing the upper mold core (22) from moving upwards is arranged on the upper mold (2).

4. The new energy automobile motor end cover low pressure casting mould of claim 3, characterized in that: the pressing plate (23) is arc-shaped.

5. The new energy automobile motor end cover low pressure casting mould of claim 2, characterized in that: an insert (24) for forming a terminal box portion (12) of the end cap is provided on the upper die (2).

6. The new energy automobile motor end cover low pressure casting mould of claim 2, characterized in that: and a boss (221) for mounting a motor bearing chamber steel sleeve (6) is formed on the upper mold core (22).

7. The new energy automobile motor end cover low pressure casting mould of claim 6, characterized in that: a plurality of first thimble holes (25) are formed in the upper mold core (22) along the outer edge of the motor bearing chamber steel sleeve (6), and after a thimble penetrates through the first thimble holes (25), the end part of the thimble is in contact with the motor bearing chamber steel sleeve (6) and part of the thimble is in contact with the casting part of the end cover.

8. The new energy automobile motor end cover low pressure casting mould of claim 7, characterized in that: and a plurality of second thimble holes (26) are formed in the upper die (2) along the circumferential direction at positions corresponding to the outer edge part of the end cover.