Brake disc shaping die for rail transit vehicle

Abstract

According to the brake disc shaping mold for the rail transit vehicle, an upper mold is designed to comprise an upper mold body and a protruding part extending in the axial direction of the upper mold body, after mold closing, the protruding part is contained in a center hole of a sintering blank and a center hole of a cavity mold to play a role of a core column, and the structural space of a lower mold is liberated; independent heating of the lower die can be achieved through the lower die heating device arranged on the inner circumferential wall of the lower die, and therefore mold filling of the radiating ribs is good. And the protruding part moves along with the upper die body, and a core column oil cylinder does not need to be independently arranged, so that the problems of sealing ring damage and potential safety hazards caused by over-high temperature of the core column oil cylinder are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of shaping moulds, in particular to a shaping mould for brake discs used in rail transit vehicles. Background Art

[0002] The preparation method of large-scale powder metallurgy products for rail transit vehicle brake discs is usually to place the powder blanks in a hot pressing shaping mold after sintering, and then remove the mold after finishing the heat dissipation ribs through the cavity mold under high temperature and high pressure. However, in traditional shaping molds, the core column and the core column cylinder are usually located in the center of the lower mold, which results in no space for the lower mold to set up a separate heating device. The heat mainly comes from the heat radiation of the female mold and the upper mold, which makes it difficult to increase the temperature of the lower mold, and then leads to insufficient filling of the heat dissipation ribs of the brake disc.

[0003] In order to ensure that the heat dissipation ribs are well filled, the upper mold and the female mold of the traditional plastic mold usually need to be heated to a very high temperature. However, since the core column of the traditional plastic mold needs to be connected to the core column cylinder to achieve lifting, the high temperature of the upper mold and the female mold will cause the temperature of the core column to be high, which will cause the temperature of the core column cylinder to rise sharply, which can easily cause damage to the cylinder sealing ring. At the same time, the oil temperature in the cylinder rises, which also brings safety hazards. Utility Model Content

[0004] Based on this, it is necessary to provide a brake disc shaping mold for rail transit vehicles that can achieve separate heating of the lower mold.

[0005] A brake disc shaping mold for rail transit vehicles, comprising an upper mold, a lower mold and a female mold which are coaxially arranged. After the molds are closed, the upper mold and the lower mold are enclosed in the female mold to form a shaping mold cavity, and the shaping mold cavity is used to accommodate a sintered blank and a cavity mold for the brake disc for rail transit vehicles. The upper mold comprises an upper mold body and a protrusion extending axially along the upper mold body, and the protrusion is adapted to the center hole of the sintered blank and the cavity mold. After the molds are closed, the protrusion is accommodated in the center hole of the sintered blank and the cavity mold; the shaping mold also comprises a lower mold heating device, and the lower mold heating device is arranged on the inner circumferential wall of the lower mold.

[0006] In one embodiment, the upper mold body and the protrusion are integrally formed.

[0007] In one of the embodiments, the lower mold heating device includes a heating sleeve arranged on the inner peripheral wall of the lower mold and heating tubes uniformly distributed in the heating sleeve along the circumferential direction.

[0008] In one of the embodiments, the shaping mold further includes an upper mold heating device, and the upper mold heating device is arranged on the outer peripheral wall of the upper mold body away from the end of the protrusion.

[0009] In one of the embodiments, the shaping mold further includes a female mold heating device, and the female mold heating device is arranged on the outer peripheral wall of the female mold.

[0010] In one embodiment, the inner wall of the female mold includes a first section extending axially, a second section extending outwardly 5° to 12° away from the axial direction, and a third section extending axially. After the mold is closed, the lower mold is tightly fitted with the first section, the cavity mold is tightly fitted with the second section, the sintered blank is loosely fitted with the third section, and the upper mold body is tightly fitted with the third section.

[0011] In one of the embodiments, the single-side distance between the sintered blank and the third section is 3 mm to 5 mm.

[0012] The above-mentioned brake disc shaping mold for rail transit vehicles is designed to include an upper mold body and a protrusion extending axially along the upper mold body. After the mold is closed, the protrusion is accommodated in the center hole of the sintered blank and the cavity mold to play the role of a core column, thereby freeing up the structural space of the lower mold. The lower mold can be heated separately by a lower mold heating device arranged on the inner wall of the lower mold, so that the heat dissipation ribs are well filled. Moreover, since the protrusion moves with the upper mold body, there is no need to separately set up a core column cylinder, thereby avoiding the problem of damage to the sealing ring and safety hazards caused by excessive temperature of the core column cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of the cross-sectional structure of a brake disc shaping mold for a rail transit vehicle according to one embodiment. DETAILED DESCRIPTION

[0014] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below, and preferred embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0015] It should be noted that when an element is referred to as being "disposed" on another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0017] See also Figure 1 , is an embodiment of a brake disc shaping mold 10 for rail transit vehicles, including a coaxially arranged upper mold 110, a lower mold 120 and a female mold 130, the upper mold 110 includes an upper mold body 112 and a protrusion 114 extending axially along the upper mold body 112, the protrusion 114 is adapted to the center holes of the sintered blank 20 and the cavity mold 30, and after the mold is closed, the protrusion 114 is accommodated in the center holes of the sintered blank 20 and the cavity mold 30.

[0018] It should be noted that the cavity of the cavity mold 30 is compatible with the heat dissipation ribs of the brake disc for rail transit vehicles to be prepared.

[0019] Furthermore, the upper mold body 112 and the protruding portion 114 are integrally formed.

[0020] In this embodiment, the shaping mold 10 further includes a lower mold heating device 122 , and the lower mold heating device 122 is disposed on the inner peripheral wall of the lower mold 120 .

[0021] Furthermore, the lower mold heating device 122 includes a heating sleeve (not shown) disposed on the inner circumferential wall of the lower mold 120 and heating tubes uniformly distributed in the heating sleeve along the circumferential direction.

[0022] It can be understood that the heating sleeve is provided with axial through holes adapted to the heating tubes along the circumferential direction, and each heating tube is arranged in the corresponding axial through hole.

[0023] It should be noted that the lower mold heating device 122 is not limited to the heating sleeve and heating tube mentioned above, and other devices that can achieve independent heating of the lower mold are also acceptable.

[0024] In this embodiment, the shaping mold 10 further includes an upper mold heating device (not shown), which is disposed on the outer peripheral wall of the upper mold body 112 at one end away from the protruding portion 144 .

[0025] It can be understood that when in use, after aligning the protrusion 114 with the center holes of the sintered blank 20 and the cavity mold 30, the upper mold 110 is lowered as a whole until the protrusion 114 is accommodated in the center holes of the sintered blank 20 and the cavity mold 30. At this time, only a part of the upper mold body 112 is located in the female mold 130, and the part with the upper mold heating device is still located outside the female mold 130.

[0026] In this embodiment, the shaping mold 10 further includes a female mold heating device (not shown), which is disposed on the outer peripheral wall of the female mold 130 .

[0027] The arrangement of the upper mold heating device, the lower mold heating device 122 and the female mold heating device can realize the individual heating of the upper mold 110, the lower mold 120 and the female mold 130 respectively, avoiding safety hazards while achieving good molding of the heat dissipation ribs.

[0028] In this embodiment, the inner wall of the female mold 130 includes a first section 131 extending in the axial direction, a second section 133 extending outwardly by 5° to 12° away from the axial direction, and a third section 135 extending in the axial direction.

[0029] After the mold is closed, the lower mold 120 is tightly matched with the first section 131 , the cavity mold 30 is tightly matched with the second section 133 , the sintered blank 20 is loosely matched with the third section 135 , and the upper mold body 114 is tightly matched with the third section 135 .

[0030] When in use, after moving at least part of the lower mold 120 into the female mold 130, the cavity mold 30 and the sintered blank 20 are placed in turn in the area enclosed by the female mold 130 heated to 360℃~450℃ and the lower mold 120 heated to 380℃~450℃, and after aligning the protrusion 114 with the center holes of the sintered blank 20 and the cavity mold 30, the upper mold body 112 heated to 360℃~450℃ is pressed down to shape. During the pressing and shaping process, the lower mold 120 is protected by pressure so that its upper surface is always flush with the end of the first section 131 of the inner wall of the female mold 130, and the cavity mold 30 is always located in the area enclosed by the second section 133 of the inner wall of the female mold 130.

[0031] The arrangement of the second section 133 of the inner wall of the female mold 130 can realize automatic guiding of the cavity mold 30 .

[0032] It should be noted that the end of the first section 131 is the connecting end of the first section 131 and the second section 133 .

[0033] The above-mentioned shaping mold 10, by setting the upper mold 110 to include an upper mold body 112 and a protrusion 114 extending axially along the upper mold body 112, the protrusion 114 is adapted to the center holes of the sintered blank 20 and the cavity mold 30, and plays the role of a core column, thereby freeing up the space of the lower mold 120, and then a lower mold heating device 112 can be set on the inner circumferential wall of the lower mold 120 to achieve separate heating of the lower mold 120; and because the protrusion 114 moves with the upper mold body 112, there is no need to set a core column cylinder separately, thereby avoiding the problem of damage to the sealing ring of the core column cylinder due to excessive temperature and safety hazards.

[0034] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A brake disc shaping mold for rail transit vehicles, comprising an upper mold, a lower mold and a female mold arranged coaxially, wherein the upper mold and the lower mold are enclosed in the female mold to form a shaping mold cavity after the mold is closed, and the shaping mold cavity is used to accommodate a sintered blank of a brake disc for rail transit vehicles and a cavity mold, characterized in that: The upper mold includes an upper mold body and a protrusion extending axially along the upper mold body, the protrusion is adapted to the center hole of the sintered blank and the cavity mold, and the protrusion is accommodated in the center hole of the sintered blank and the cavity mold after the mold is closed; the shaping mold also includes a lower mold heating device, and the lower mold heating device is arranged on the inner circumferential wall of the lower mold.

2. The brake disc shaping mold for rail transit vehicles according to claim 1, characterized in that: The upper mold body and the protruding portion are integrally formed.

3. The brake disc shaping mold for rail transit vehicles according to claim 1, characterized in that: The lower mold heating device comprises a heating sleeve arranged on the inner peripheral wall of the lower mold and heating tubes uniformly distributed in the heating sleeve along the circumferential direction.

4. The brake disc shaping mold for rail transit vehicles according to claim 1, characterized in that: The shaping mold further comprises an upper mold heating device, and the upper mold heating device is arranged on the outer peripheral wall of the upper mold body away from one end of the protruding portion.

5. The brake disc shaping mold for rail transit vehicles according to claim 1, characterized in that: The shaping mold further comprises a female mold heating device, and the female mold heating device is arranged on the outer peripheral wall of the female mold.

6. The brake disc shaping die for rail transit vehicles according to any one of claims 1 to 5, characterized in that: The inner wall of the female mold includes a first section extending axially, a second section extending outwardly at 5° to 12° away from the axial direction, and a third section extending axially. After the mold is closed, the lower mold is tightly matched with the first section, the cavity mold is tightly matched with the second section, the sintered blank is loosely matched with the third section, and the upper mold body is tightly matched with the third section.

7. The brake disc shaping mold for rail transit vehicles according to claim 6, characterized in that: The single-side distance between the sintered blank and the third section is 3 mm to 5 mm.

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