CN115945687A - Cavity mold, friction body and brake shoe preparation method - Google Patents
Cavity mold, friction body and brake shoe preparation method Download PDFInfo
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- CN115945687A CN115945687A CN202211699566.9A CN202211699566A CN115945687A CN 115945687 A CN115945687 A CN 115945687A CN 202211699566 A CN202211699566 A CN 202211699566A CN 115945687 A CN115945687 A CN 115945687A
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Abstract
The invention discloses a cavity die, a friction body and a brake shoe preparation method, relates to the technical field of vehicle braking, and aims to solve the problem that the side surface of a pressed blank of the friction body and the inner wall of a die cavity are easy to rub and pull to crack when the conventional die cavity die with a closed periphery is used for pressing and stripping. The cavity mold includes: the device comprises a fixed side vertical die, a movable side vertical die, an upper die head and a lower die head. The fixed side vertical die is used for being fixedly connected to the die frame. The movable side vertical mold and the fixed side vertical mold are arranged oppositely in the first direction, and the movable side vertical mold can move along the first direction relative to the fixed side vertical mold. The upper die head is arranged between the fixed side vertical die and the movable side vertical die. The lower die head is arranged between the fixed side vertical die and the movable side vertical die, the upper die head is positioned above the lower die head, and the upper die head and the lower die head move up and down relatively. The friction body preparation method comprises the following steps: pouring friction powder into the cavity; and driving the upper die head to move towards the lower die head, and pressing and forming the friction powder to obtain the friction body. The cavity die provided by the invention is used for pressing friction bodies.
Description
Technical Field
The invention relates to the technical field of vehicle braking, in particular to a cavity die, a friction body and a brake shoe preparation method.
Background
With the continuous development of urban trains and locomotives, the situation that a metal inlaid composite brake shoe is gradually replaced by a powder metallurgy brake shoe for the environment with harsh working conditions often occurs. The prior art powder metallurgy brake shoe is mainly composed of a shoe back and a plurality of friction components, wherein each friction component is composed of an inner lining plate and a friction body. In the prior art, the friction component is formed by pressure sintering, the pressure surface is a plane friction surface, a plurality of friction components are welded to the shoe back to form a blank of the powder metallurgy brake shoe, and finally, the plane friction surface is processed to form the friction surface with inclination and radian.
The existing cavity die is a die cavity die with closed periphery, and the side surface of a friction body pressed compact and the inner wall of the die cavity are easy to rub and tear when the die is pressed and stripped.
Disclosure of Invention
The invention aims to provide a cavity die, a friction body and a brake shoe preparation method, which are used for solving the problem that the side surface of a friction body pressed blank and the inner wall of a die cavity are easy to rub and pull to crack when the existing die cavity die with the closed periphery is pressed and stripped.
In order to achieve the above purpose, the invention provides the following technical scheme: a cavity mold, comprising:
the fixed side vertical die is used for being fixedly connected to the die frame;
a movable-side vertical mold which is arranged opposite to the fixed-side vertical mold in a first direction and can move along the first direction relative to the fixed-side vertical mold;
the upper die head is arranged between the fixed side vertical die and the movable side vertical die;
the lower die head is arranged between the fixed side vertical die and the movable side vertical die, the upper die head is positioned above the lower die head, the upper die head and the lower die head move up and down relatively, after the movable side vertical die is attached to one side of the fixed side vertical die, a cavity is formed among the fixed side vertical die, the movable side vertical die, the upper die head and the lower die head and is used for pressing a friction body.
In some alternative embodiments, the surface of the lower die head facing the upper die head is a special-shaped surface formed by connecting a slope and an arc surface.
In some optional embodiments, the upper die head is a columnar structure, the upper die head comprises a die head base body and a die cavity matching punch part which are connected, the die cavity matching punch part is close to the lower die head, the die head base body is far away from the lower die head, and a gap between the die cavity matching punch part and the inner wall of the die cavity is smaller than a gap between the die head base body and the inner wall of the die cavity.
In some optional embodiments, the surface roughness of the cavity mating punch is ra0.2 to ra0.8.
In some alternative embodiments, the die base has a surface roughness of Ra1.6 to Ra6.3.
In some alternative embodiments, the cavity mold further comprises:
the first vertical die is arranged between the fixed side vertical die and the movable side vertical die and is close to one side of the upper die head and one side of the lower die head, and the first vertical die forms one inner wall surface of the cavity;
and the second vertical die is arranged between the fixed side vertical die and the movable side vertical die and is close to the other sides of the upper die head and the lower die head, the first vertical die and the second vertical die are oppositely arranged in a second direction, the second vertical die forms the other inner wall surface of the cavity, and the first direction is vertical to the second direction.
In some optional embodiments, the first vertical mold and the second vertical mold have the same structure, and the cross section of the first vertical mold in the horizontal direction is a semicircular surface or a surface formed by combining a semicircular surface and a rectangular surface.
Compared with the prior art, in the cavity mold provided by the invention, the movable side vertical mold is movably matched with the fixed side vertical mold, the upper mold head and the lower mold head are combined to form a cavity for pressing the friction body, and in the process of pressing the friction body, the movable side vertical mold, the fixed side vertical mold and the lower mold head are kept still and move from the upper mold head to the lower mold head until the friction body is pressed. The die cavity die is a side-opening die, when the die is opened, the side-opening die is driven to move, so that the die cavity is opened, the die is removed, and the condition of friction and tension cracking cannot occur between the side surface of a pressed blank and the inner wall of the die cavity in the process of die removal.
The invention also provides a friction body preparation method, which comprises the following steps:
fixing the fixed side vertical die and the lower die head on a die frame;
driving the movable side vertical die to move towards the fixed side vertical die, so that the movable side vertical die and the fixed side vertical die are closed to form a side wall surface of a forming cavity, and the lower die head forms the bottom surface of the forming cavity;
pouring friction powder into the cavity;
driving the upper die head to move towards the lower die head, and pressing and forming the friction powder to obtain a friction body;
and driving the upper die head to be far away from the lower die head, driving the movable side vertical die to be far away from the fixed side vertical die, opening the die cavity, and taking out the friction body.
In some alternative embodiments, when the cavity mold further comprises a first vertical mold and a second vertical mold, the first vertical mold and the second vertical mold are fixed to the mold frame while the fixed-side vertical mold and the lower mold are fixed to the mold frame; and driving the movable side vertical die to move towards the fixed side vertical die, so that the movable side vertical die and the fixed side vertical die are closed to form a pair of side wall surfaces of a forming cavity, the lower die head forms the bottom surface of the forming cavity, and the first vertical die and the second vertical die respectively form the other pair of side wall surfaces of the forming cavity.
Compared with the prior art, the friction body prepared by the steps is demoulded after the friction body is pressed due to the use of the cavity die, and a side-open demoulding mode (the movable side vertical die is driven to be far away from the fixed side vertical die, so that the cavity is opened) is adopted, so that the side surface of a pressed blank and the inner wall of the cavity can not be subjected to friction and pull cracking.
The invention also provides a brake shoe preparation method, which comprises the friction body preparation method, and after the friction body is taken out, the brake shoe preparation method further comprises the following steps:
the friction body is matched with the lining plate to be sintered under no pressure to obtain a friction assembly;
and welding the friction assembly on the back of the shoe along the surface of the lining plate to obtain the brake shoe.
Compared with the prior art, the preparation method of the brake shoe provided by the invention has the same beneficial effects as those of the friction body, and the details are not repeated. In addition, the problem that the pressure sintering can not realize the sintering molding of the friction body pressed compact with the complex special-shaped surface is solved through the pressureless sintering.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:
FIG. 1 is a schematic perspective view of a cavity mold according to the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic diagram of the upper die of FIG. 1;
FIG. 4 is a schematic perspective view of the lower die of FIG. 2;
FIG. 5 is a schematic perspective view of a brake shoe made according to the present invention.
Reference numerals:
1-fixing a side vertical mold; 2-moving the side vertical mold; 3-upper die head; 301-a die base; 302-cavity mating punch; 4-lower die head; 5-a first vertical mold; 6-second vertical mold; 7-a friction body; 8-inner lining plate; 9-tile back.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and 2, a cavity mold according to an embodiment of the present invention includes: a fixed-side vertical die 1, a moving-side vertical die 2, an upper die head 3, and a lower die head 4. Wherein, the fixed side vertical die 1 is used for being fixedly connected on a die carrier. The movable-side vertical mold 2 is provided to face the fixed-side vertical mold 1 in the first direction, and the movable-side vertical mold 2 is movable in the first direction with respect to the fixed-side vertical mold 1. For example, the first direction may be a horizontal left-right direction. The upper die head 3 is provided between the fixed-side vertical die 1 and the moving-side vertical die 2. The lower die head 4 is arranged between the fixed side vertical die 1 and the moving side vertical die 2, the upper die head 3 is positioned above the lower die head 4, the upper die head 3 and the lower die head 4 move up and down relatively, after the moving side vertical die 2 is attached to one side of the fixed side vertical die 1, a cavity is formed among the fixed side vertical die 1, the moving side vertical die 2, the upper die head 3 and the lower die head 4 and is used for pressing a friction body.
In the specific implementation: the fixed side vertical die 1 and the lower die head 4 are fixedly connected to a die frame, the fixed connection mode can be bolt connection, the fixed connection mode can also be fixedly connected in a welding mode, the movable side vertical die 2 is driven to move towards the direction of the fixed side vertical die 1, the specific driving mode is that a piston rod of an air cylinder is connected to one side, away from the fixed side vertical die 1, of the movable side vertical die 2, the air cylinder is started, the piston rod of the air cylinder moves towards the direction of the fixed side vertical die 1, so that the movable side vertical die 2 moves towards the direction of the fixed side vertical die 1 until the movable side vertical die 2 is attached to the fixed side vertical die 1, a cavity is formed among the fixed side vertical die 1, the movable side vertical die 2 and the lower die head 4, configured friction powder is poured into the formed cavity from top to bottom, then the upper die head 3 is placed into the cavity, the upper die head 3 is driven towards the direction of the lower die head 4, the friction powder is pressed to form a friction body, and the upper die head 3 can be driven by a top cylinder.
According to the structure and the specific implementation process of the cavity die, the movable side vertical die 2 is movably matched with the fixed side vertical die 1, the upper die head 3 and the lower die head 4 are combined to form a cavity for pressing a friction body, and in the process of pressing the friction body, the movable side vertical die 2, the fixed side vertical die 1 and the lower die head 4 are kept still and move from the upper die head 3 to the lower die head 4 until the friction body is pressed. This die cavity mould is side open mode mould, and when the die sinking, the drive removes side founds mould 2 for the die cavity is opened, accomplishes the drawing of patterns, and at the in-process of drawing of patterns, the condition that the friction stretch-fracture can not appear in pressed compact side and die cavity inner wall.
Referring to fig. 2 and 4, in some embodiments, the surface of the lower die 4 facing the upper die 3 is a special-shaped surface formed by connecting an inclined surface and an arc surface. The inclined surface is a surface inclined with respect to a horizontal surface during pressing. In the prior art, a plane structure is pressed by a die cavity die with a closed periphery, and the pressed plane needs to be secondarily processed into a special-shaped surface. The cavity die can form a special-shaped surface formed by connecting the inclined surface and the cambered surface in the process of pressing the friction body, so that the processing steps are saved, and the time and the labor are saved.
Referring to fig. 3, in some embodiments, the upper mold head 3 has a cylindrical structure, a cylinder structure, or a rectangular cylinder structure. The upper die head 3 comprises a die head base body 301 and a die cavity matched punching portion 302 which are connected, the die cavity matched punching portion 302 is close to the lower die head 4, the die head base body 301 is far away from the lower die head, and the gap between the die cavity matched punching portion 302 and the inner wall of the die cavity is smaller than the gap between the die head base body 301 and the inner wall of the die cavity. When the friction body is pressed, the top cylinder only needs to act on the upper die head 3, and the cavity matching punch part 302 of the upper die head 3 is matched with the cavity and pressed to obtain the friction body. The whole pressing process is simple and convenient; the clearance between the die cavity matching punch part 302 and the inner wall of the die cavity is smaller than the clearance between the die head base body 301 and the inner wall of the die cavity, so that the upper die head 3 can move in the die cavity conveniently, and material leakage during friction body pressing can be effectively prevented.
In some embodiments, the surface roughness of the cavity mating punch 302 is Ra0.2 to Ra0.8. The cavity matching punch 302 needs to be matched with the cavity to press the friction body, and the requirement on surface roughness is high. In specific implementation, the surface roughness of the cavity fitting punch 302 can be Ra0.2, ra0.4, ra0.8 and the like.
In some embodiments, the die base 301 has a surface roughness of Ra1.6 to Ra6.3. The die base 301 serves as the stressed portion of the upper die 3 and has a lower surface roughness requirement. In specific implementation, the surface roughness of the die base 301 may be ra1.6, ra3.2, ra6.3, or the like.
Referring to fig. 1 and 2, in some embodiments, the cavity mold further includes: a first vertical die 5 and a second vertical die 6. The first vertical mold 5 is provided between the fixed-side vertical mold 1 and the movable-side vertical mold 2 and is in close contact with one side of the upper mold head 3 and the lower mold head 4, the first vertical mold 5 is surrounded by the fixed-side vertical mold 1 and the movable-side vertical mold 2 and is located in a cavity surrounded by the fixed-side vertical mold 1 and the movable-side vertical mold 2, and one side surface of the first vertical mold 5 facing the second vertical mold 6 forms one inner wall surface of the cavity. The second vertical mold 6 is provided between the fixed-side vertical mold 1 and the movable-side vertical mold 2 and is positioned close to the other side of the upper mold head 3 and the lower mold head 4, the second vertical mold 6 is surrounded by the fixed-side vertical mold 1 and the movable-side vertical mold 2 and is positioned in a cavity surrounded by the fixed-side vertical mold 1 and the movable-side vertical mold 2, and the other inner wall surface of the cavity is formed on one side surface of the second vertical mold 6 facing the first vertical mold 5. So far, the first vertical die 5 and the second vertical die 6 form front and back inner wall surfaces of a cavity; the fixed-side vertical mold 1 and the movable-side vertical mold 2 form two left and right inner wall surfaces of the cavity. The first vertical mold 5 and the second vertical mold 6 are disposed opposite to each other in the second direction, which may be, for example, a horizontal front-rear direction. The first direction and the second direction are perpendicular.
In the specific implementation: after the first vertical mold 5 and the second vertical mold 6 are provided, the first vertical mold 5 and the second vertical mold 6 are wrapped by the fixed-side vertical mold 1 and the movable-side vertical mold 2 to form inner wall surfaces of a cavity. The friction body is pressed in six directions by the fixed side vertical die 1, the moving side vertical die 2, the first vertical die 5, the second vertical die 6, the upper die head 3 and the lower die head 4, so that the pressing effect of the friction body is better; the first vertical mold 5 and the second vertical mold 6 are limited by the fixed side vertical mold 1 and the movable side vertical mold 2, and a positioning mechanism is not needed when the first vertical mold 5 and the second vertical mold 6 are connected, so that the overall structure is simple. If the first vertical die 5 and the second vertical die 6 are not arranged, the fixed side vertical die 1 and the movable side vertical die 2 surround the front, the back, the left and the right, and then surround the upper and the lower surfaces through the upper die head 3 and the lower die head 4 to finally form a cavity.
Referring to fig. 1, in some embodiments, the first vertical mold 5 and the second vertical mold 6 have the same structure, and the cross section of the first vertical mold 5 in the horizontal direction is a semicircular surface or a surface formed by combining a semicircular surface and a rectangular surface.
The embodiment of the invention provides a friction body preparation method, which comprises the following steps:
step S100, fixing the fixed side vertical die 1 and the lower die head 4 on a die carrier;
step S200, driving the moving side vertical die 2 to move towards the fixed side vertical die 1, so that the moving side vertical die 2 and the fixed side vertical die 1 are closed to form a side wall surface of a cavity, and the lower die head 4 forms a bottom surface of the cavity;
step S300, pouring friction powder into a cavity;
step S400, driving the upper die head 3 to move towards the lower die head 4, and pressing and forming friction powder to obtain a friction body 7;
and step S500, driving the upper die head 3 to be away from the lower die head 4, driving the movable side vertical die 2 to be away from the fixed side vertical die 1, opening the die cavity, and taking out the friction body 7.
According to the friction body 7 prepared by the steps, due to the use of the cavity die, the friction body 7 is demolded after being pressed, and a side-open demolding mode (driving the movable side vertical die 2 to be far away from the fixed side vertical die 1 to open the cavity) is adopted, so that the condition that the side surface of a pressed blank and the inner wall of the cavity are not cracked due to friction can be avoided.
In the above-described steps, the movable-side vertical mold 2 is driven by an air cylinder to move toward the fixed-side vertical mold 1, and the fixed-side vertical mold 1 is fixed to the mold frame by means of a bolt.
In some embodiments, when the cavity mold further includes the first vertical mold 5 and the second vertical mold 6, the first vertical mold 5 and the second vertical mold 6 are fixed to the mold frame while the fixed-side vertical mold 1 and the lower die head 4 are fixed to the mold frame in step S100.
Accordingly, in step S200, the moving-side vertical mold 2 is driven to move toward the fixed-side vertical mold 1, the moving-side vertical mold 2 and the fixed-side vertical mold 1 are closed to form a pair of side wall surfaces of the cavity, the lower die head 4 forms a bottom surface of the cavity, and the first vertical mold 5 and the second vertical mold 6 form the other pair of side wall surfaces of the cavity, respectively.
According to the brake shoe preparation method provided by the embodiment of the invention, after the friction body 7 is taken out, the brake shoe preparation method further comprises the following steps:
step S600, the friction body 7 is matched with the lining plate 8 to be sintered without pressure to obtain a friction assembly;
step S700, welding the friction assembly on the shoe back 9 along the inner lining 8 to obtain the brake shoe.
The beneficial effects of the brake shoe prepared by the steps are the same as those of the friction body, and are not described in detail herein. In addition, the problem that the pressure sintering can not realize the compact sintering forming of the friction body with the complex special-shaped surface is solved through pressureless sintering.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A cavity mold, comprising:
the fixed side vertical die is fixedly connected to the die frame;
the movable side vertical die is arranged opposite to the fixed side vertical die in a first direction, and the movable side vertical die can move relative to the fixed side vertical die along the first direction;
the upper die head is arranged between the fixed side vertical die and the movable side vertical die;
the lower die head is arranged between the fixed side vertical die and the movable side vertical die, the upper die head is positioned above the lower die head, the upper die head and the lower die head move up and down relatively, after the movable side vertical die is attached to one side of the fixed side vertical die, a cavity is formed among the fixed side vertical die, the movable side vertical die, the upper die head and the lower die head and is used for pressing a friction body.
2. The cavity mold according to claim 1, wherein a surface of the lower die head facing the upper die head is a profile surface consisting of a connection of an inclined surface and an arc surface.
3. The cavity die of claim 1, wherein the upper die head is of a columnar structure and comprises a die head base body and a cavity matching punch portion which are connected, the cavity matching punch portion is close to the lower die head, the die head base body is far away from the lower die head, and a gap between the cavity matching punch portion and the inner wall of the cavity is smaller than a gap between the die head base body and the inner wall of the cavity.
4. The cavity mold according to claim 3, wherein the surface roughness of the cavity mating punch is Ra0.2 to Ra0.8.
5. The cavity mold according to claim 3, wherein the surface roughness of the die base is Ra1.6 to Ra6.3.
6. The cavity mold of claim 1, further comprising:
the first vertical die is arranged between the fixed side vertical die and the movable side vertical die and is close to one side of the upper die head and one side of the lower die head, and the first vertical die forms one inner wall surface of the cavity;
and the second vertical die is arranged between the fixed side vertical die and the movable side vertical die and is close to the other sides of the upper die head and the lower die head, the first vertical die and the second vertical die are oppositely arranged in a second direction, the second vertical die forms the other inner wall surface of the cavity, and the first direction is vertical to the second direction.
7. The cavity mold according to claim 6, wherein the first vertical mold and the second vertical mold have the same structure, and a cross section of the first vertical mold in a horizontal direction is a semicircular surface or a surface formed by combining a semicircular surface and a rectangular surface.
8. A method for producing a friction body, using the cavity mold according to any one of claims 1 to 7, comprising the steps of:
fixing the fixed side vertical die and the lower die head on a die set;
driving the movable side vertical die to move towards the fixed side vertical die, so that the movable side vertical die and the fixed side vertical die are closed to form a side wall surface of a forming cavity, and the lower die head forms the bottom surface of the forming cavity;
pouring friction powder into the cavity;
driving the upper die head to move towards the lower die head, and pressing and forming the friction powder to obtain a friction body;
and driving the upper die head to be far away from the lower die head, driving the movable side vertical die to be far away from the fixed side vertical die, opening the cavity, and taking out the friction body.
9. The friction body manufacturing method according to claim 8, wherein when the cavity mold further includes a first vertical mold and a second vertical mold, the first vertical mold and the second vertical mold are fixed to a mold frame while the fixed-side vertical mold and the lower mold are fixed to the mold frame;
and driving the movable side vertical die to move towards the fixed side vertical die, so that the movable side vertical die and the fixed side vertical die are closed to form a pair of side wall surfaces of a forming cavity, the lower die head forms the bottom surface of the forming cavity, and the first vertical die and the second vertical die respectively form the other pair of side wall surfaces of the forming cavity.
10. A method for producing a brake shoe, comprising the method for producing a friction body according to claim 8 or 9, and further comprising the steps of, after removing the friction body:
the friction body is matched with the lining plate to be sintered under no pressure to obtain a friction assembly;
and welding the friction assembly on the back of the shoe along the surface of the inner lining plate to obtain the brake shoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211699566.9A CN115945687A (en) | 2022-12-28 | 2022-12-28 | Cavity mold, friction body and brake shoe preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211699566.9A CN115945687A (en) | 2022-12-28 | 2022-12-28 | Cavity mold, friction body and brake shoe preparation method |
Publications (1)
| Publication Number | Publication Date |
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| CN115945687A true CN115945687A (en) | 2023-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211699566.9A Pending CN115945687A (en) | 2022-12-28 | 2022-12-28 | Cavity mold, friction body and brake shoe preparation method |
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| Country | Link |
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| CN (1) | CN115945687A (en) |
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- 2022-12-28 CN CN202211699566.9A patent/CN115945687A/en active Pending
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