Injection mold and injection molding method
An injection mold and an injection molding method are provided. The injection mold includes a housing and a cover. The housing is provided with a mold cavity. The mold cavity is configured to accommodate a power module. The cover is provided with a plurality of vias. The cover is detachably connected to the housing. The cover is located in the mold cavity and locates the power module jointly with the housing. The plurality of vias is configured to match a plurality of pins of the power module. In the present disclosure, the cover is disposed, and the cover is provided with the vias for pins to pass through. By using covers with different arrangement manners of vias, a same set of injection molds can be compatible with power modules of a same series that have different locations of pins. Arrangement manners of vias on different covers are different.
1 . An injection mold, comprising a housing and a cover, wherein
the housing is provided with a mold cavity, and the mold cavity is configured to accommodate a power module; and
the cover is provided with a plurality of vias, the cover is detachably connected to the housing, the cover is located in the mold cavity and locates the power module jointly with the housing, and the plurality of vias is configured to match a plurality of pins of the power module,
wherein the injection mold further comprises an elastic connection structure connected to the cover, to implement an elastic connection between the cover and the housing, and
wherein the elastic connection structure comprises a support rod and an elastic part, the support rod is elastically connected to the cover by using the elastic part, and the support rod is in contact with an inner surface of the housing.
2 . The injection mold according to claim 1 , wherein the cover comprises a first surface and a second surface that are opposite to each other, each of the plurality of vias penetrates the first surface and the second surface, the support rod comprises a first cylinder and a second cylinder, the first cylinder is located on a side of the first surface of the cover, the second cylinder comprises a limiting part and a connecting part, the cover is provided with a limiting hole, the limiting part is located in the limiting hole and fits with a limiting structure in the limiting hole to prevent the limiting part from moving out of the cover from the side of the first surface, the connecting part extends out of the limiting hole and is fastened to the first cylinder, and the elastic part is sleeved on the connecting part and is elastically held between the first surface and the first cylinder.
3 . The injection mold according to claim 1 , wherein the housing comprises a first housing and a second housing, the first housing is provided with a first cavity, the first cavity comprises a first sub-cavity and a second sub-cavity, a stepped surface is formed at a joint between the first sub-cavity and the second sub-cavity, the second housing comprises a second cavity, the first housing and the second housing are snap-fitted so that the second cavity is connected to the first cavity, the cover is located in the first sub-cavity, a part of the power module is located in the second cavity, and a part of the power module is located in the second sub-cavity and is in contact with the stepped surface.
4 . The injection mold according to claim 1 , wherein a quantity of vias of the cover is greater than or equal to a quantity of pins of the power module, and an arrangement manner of vias of the cover matches a plurality of pins of at least one power module.
5 . The injection mold according to claim 1 , wherein each of the plurality of vias comprises a first section and a second section, a limiting surface is formed between the first section and the second section, the first section is configured to accommodate a body part of one of the plurality of pins, the second section is configured to accommodate a fixed part that protrudes from a periphery of the body part, and the limiting surface is in contact with a stepped surface formed at a joint between the body part and the fixed part to implement a sealed connection between the cover and the pin.
6 . The injection mold according to claim 5 , wherein the cover comprises a first surface and a second surface that are opposite to each other; and for each of the plurality of vias, the respective via penetrates the first surface and the second surface, a sealing pad is disposed on the second surface, and the sealing pad is disposed at a periphery of the respective via, and/or the sealing pad is disposed on the limiting surface of the respective via.
7 . The injection mold according to claim 1 , wherein the cover comprises a first surface and a second surface that are opposite to each other, each of the plurality of vias penetrates the first surface and the second surface, a limiting block is disposed on the second surface of the cover, and the limiting block is embedded into a limiting hole on the power module to limit locations of the cover and the power module.
8 . An injection molding method, comprising:
providing an injection mold, wherein the injection mold comprises a housing and at least two covers and an elastic connection structure, the housing is provided with a mold cavity, each of the at least two covers is provided with a plurality of vias, arrangement manners of the plurality of vias on different covers are different, and the elastic connection structure is connected to each of the at least two covers, to implement an elastic connection between each of the at least two covers and the housing;
selecting one of the covers as a selected cover based on a distribution status of pins of a to-be-injection-molded power module, wherein an arrangement manner of the plurality of vias on the selected cover matches an arrangement manner of the pins of the to-be-injection-molded power module;
placing the to-be-injection-molded power module in the mold cavity; and
mounting the selected cover to the to-be-injection-molded power module, so that the pins pass through the plurality of vias,
wherein the elastic connection structure comprises a support rod and an elastic part, the support rod is elastically connected to the at least two covers by using the elastic part, and the support rod is in contact with an inner surface of the housing.
9 . An injection mold, comprising:
a housing, provided with a mold cavity, wherein the mold cavity is configured to accommodate a power module; and
at least two covers, wherein each of the at least two covers is provided with a plurality of vias, and arrangement manners of the plurality of vias on different covers are different, to match a plurality of pins of power modules of different models, wherein
the housing selectively fits with one of the at least two covers to jointly locate the power module,
wherein the injection mold further comprises an elastic connection structure connected to each of the at least two covers, to implement an elastic connection between each of the at least two covers and the housing, and
wherein the elastic connection structure comprises a support rod and an elastic part, the support rod is elastically connected to the at least two covers by using the elastic part, and the support rod is in contact with an inner surface of the housing.
10 . The injection mold according to claim 9 , wherein, for each of the at least two covers: the respective cover comprises a first surface and a second surface that are opposite to each other, at least one of the plurality of vias penetrates the first surface and the second surface of the respective cover, the support rod comprises a first cylinder and a second cylinder, the first cylinder is located on a side of the first surface of the respective cover, the second cylinder comprises a limiting part and a connecting part, the respective cover is provided with a limiting hole, the limiting part is located in the limiting hole and fits with a limiting structure in the limiting hole to prevent the limiting part from moving out of the respective cover from the side of the first surface, the connecting part extends out of the limiting hole and is fastened to the first cylinder, and the elastic part is sleeved on the connecting part and is elastically held between the first surface and the first cylinder.
11 . The injection mold according to claim 9 , wherein the housing comprises a first housing and a second housing, the first housing is provided with a first cavity, the first cavity comprises a first sub-cavity and a second sub-cavity, a stepped surface is formed at a joint between the first sub-cavity and the second sub-cavity, the second housing comprises a second cavity, the first housing and the second housing are snap-fitted so that the second cavity is connected to the first cavity, each of the at least two covers is located in the first sub-cavity, a part of the power module is located in the second cavity, and a part of the power module is located in the second sub-cavity and is in contact with the stepped surface.
12 . The injection mold according to claim 9 , wherein a quantity of vias of each of the at least two covers is greater than or equal to a quantity of pins of the power module, and an arrangement manner of vias of each of the two covers matches a plurality of pins of at least one power module.
13 . The injection mold according to claim 9 , wherein each of the plurality of vias comprises a first section and a second section, a limiting surface is formed between the first section and the second section, the first section is configured to accommodate a body part of one of the plurality of pins, the second section is configured to accommodate a fixed part that protrudes from a periphery of the body part, and the limiting surface is in contact with a stepped surface formed at a joint between the body part and the fixed part to implement a sealed connection between one of the at least two covers and the pin.
14 . The injection mold according to claim 13 , wherein, for each of the at least two covers: the respective cover comprises a first surface and a second surface that are opposite to each other, at least one of the plurality of vias penetrates the first surface and the second surface of the respective cover, a sealing pad is disposed on the second surface, and the sealing pad is disposed at a periphery of the at least one of the plurality of vias, and/or the sealing pad is disposed on the limiting surface of the at least one plurality of vias.
15 . The injection mold according to claim 9 , wherein, for each of the at least two covers: the respective cover comprises a first surface and a second surface that are opposite to each other, at least one of the plurality of vias penetrates the first surface and the second surface of the respective cover, a limiting block is disposed on the second surface of the respective cover, and the limiting block is embedded into a limiting hole on the power module to limit locations of the respective cover and the power module.