Ventilation type brake disc forming die

Abstract

According to the ventilation type brake disc forming die, radial through holes corresponding to core-pulling insert pins in number are evenly distributed in the side wall of a female die in the circumferential direction, and blind holes corresponding to the core-pulling insert pins in number are evenly distributed in the side wall of a core column in the circumferential direction, so that each core-pulling insert pin is arranged in the radial direction after penetrating into the corresponding radial through hole and the corresponding blind hole; and then the core-pulling insert pin is pulled out after powder filling pressing is completed, and the ventilation type brake disc with the radial channels distributed in the radial shape in the circumferential direction can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of brake discs, in particular to a ventilated brake disc forming die. Background Art

[0002] With the dual carbon goals, lightweighting of transportation equipment is imperative. As an unsprung component of a vehicle, brake discs have a more significant lightweighting effect than sprung components, so they have become a key lightweighting direction for passenger cars. Ceramic-reinforced aluminum-based composites have become one of the preferred materials for lightweight brake discs for passenger cars due to their good wear resistance, high hardness, low density, and fast thermal conductivity.

[0003] At present, the industrial production methods for preparing aluminum-based composite brake discs mainly include stirring casting and powder metallurgy. Stirring casting is limited by the process, and the volume content of ceramic reinforcement is difficult to exceed 20%, and the performance of the prepared aluminum-based composite brake disc is limited; although powder metallurgy has the advantages of strong material designability, low preparation temperature, can greatly improve the mechanical properties and wear and temperature resistance of aluminum-based composite materials, and can achieve near-net forming of structures such as disc caps, etc., but the powder metallurgy method can only make holes vertically and cannot prepare transverse ventilation channels, which limits the ventilation and heat dissipation capacity of ceramic-reinforced aluminum-based composite brake discs, making ceramic-reinforced aluminum-based composite brake discs face more severe high-temperature working conditions. At the same time, the inability to prepare transverse ventilation channels also reduces the lightweight effect of the brake disc, affecting the promotion and application of ceramic-reinforced aluminum-based composite brake discs.

[0004] CN115045932B discloses a method for preparing a ventilated brake disc, which comprises the following steps: superimposing two disc blanks with a plurality of grooves along the circumferential direction so that the corresponding grooves enclose a ventilation channel, and then hot pressing and sintering the discs; then inserting a support sleeve into the ventilation channel and densifying the discs; and selecting an aluminum tube as the support sleeve outside a steel rod, applying high-temperature lubricating oil between the aluminum tube and the steel rod, and calculating the outer diameter of the support sleeve according to the inner diameter of the ventilation channel after sintering and the compression at the non-ventilation channel and the compression at the ventilation channel after densification. The steel tube can be easily removed after densification, and the aluminum tube can be removed by machining or retained in the ventilation channel as appropriate, thereby realizing the preparation of a brake disc with a transverse ventilation channel by powder metallurgy. Utility Model Content

[0005] Based on this, it is necessary to provide a new ventilated brake disc forming mold, which only needs to fill the powder into it and then perform bidirectional pressing to obtain a ventilated brake disc with lateral ventilation channels, omitting process steps such as pre-pressing and machining holes.

[0006] A ventilated brake disc forming mold comprises a coaxially arranged upper mold, a lower mold, a female mold and a core column, and also comprises a plurality of core-pulling pins. The female mold side wall is circumferentially evenly provided with radial through holes corresponding to the number of the core-pulling pins, and the core column side wall is circumferentially evenly provided with blind holes corresponding to the number of the core-pulling pins. Each of the core-pulling pins is radially arranged after being inserted into the corresponding radial through hole and blind hole.

[0007] In one of the embodiments, the ventilated brake disc forming mold also includes a female mold sleeve sleeved outside the female mold, the upper surface of the female mold sleeve is provided with guide grooves corresponding to the radial through holes one by one, each of the guide grooves is provided with a core-pulling needle resetting device, the core-pulling needle resetting device includes a reset spring, a reset rod, a limit block and a slider, the limit block is fixedly arranged in the guide groove, the slider is slidably arranged in the guide groove, one end of the reset rod is sleeved with the reset spring, and the other end passes through the limit block and is connected to the slider, and the slider is connected to the core-pulling needle.

[0008] In one of the embodiments, the ventilated brake disc forming mold also includes a core-pulling needle pushing device, which includes an upper mold base and inserts arranged one by one corresponding to the guide grooves, one end of each of the inserts is connected to the upper mold base, and the other end forms a pushing portion, and the pushing portion has an outer surface extending along the axial direction and an inner surface extending outward away from the axial direction.

[0009] In one of the embodiments, each of the guide grooves is further provided with a first axial through hole penetrating the female mold sleeve. After the pushing portion of each insert is inserted into the first axial through hole of the corresponding guide groove, the outer surface fits with the limit block, and the inner surface fits with the sliding block.

[0010] In one of the embodiments, the ventilated brake disc forming mold also includes a cavity bottom plate overlapped with the female mold sleeve, and the cavity bottom plate is evenly distributed along the circumferential direction with second axial through holes corresponding to the first axial through holes one by one, and each of the second axial through holes is provided with a wear-resistant block, and after the pushing portion of each of the inserts is inserted into the corresponding first axial through hole and the second axial through hole in sequence, the outer surface fits with the wear-resistant block.

[0011] In one embodiment, the ventilated brake disc forming mold also includes a lower mold base, and the lower mold base is evenly distributed with a plurality of floating support devices along the circumferential direction, each of the floating support devices includes a support limit block, a support rod and a support spring; the cavity bottom plate is provided with a T-shaped axial through hole corresponding to the floating support device one by one, and the lower mold base is provided with a third axial through hole corresponding to the floating support device one by one, each of the support limit blocks is fixed at the corresponding third axial through hole, one end of each of the support rods is hung in the corresponding T-shaped axial through hole, and the other end passes through the corresponding support limit block and is inserted into the corresponding third axial through hole, and each of the support springs is sleeved on the corresponding support rod, one end of which is located in the corresponding support limit block, and the other end is against the cavity bottom plate.

[0012] In one of the embodiments, an axial channel is provided at the center of the lower die base, a lower die push rod is provided in the axial channel, one end of the lower die push rod is connected to the lower die, and the other end is connected to the oil cylinder.

[0013] In one embodiment, the end of the core column close to the upper mold is tapered.

[0014] In one embodiment, the upper mold cooperates with the core column to seal the upper opening of the female mold; the lower mold cooperates with the core column to seal the lower opening of the female mold.

[0015] The above-mentioned ventilated brake disc forming mold has radial through holes evenly distributed along the circumferential direction on the side wall of the female mold and corresponding to the number of core-pulling pins, and blind holes evenly distributed along the circumferential direction on the side wall of the core column and corresponding to the number of core-pulling pins, so that each core-pulling pin is radially arranged after passing through the corresponding radial through hole and blind hole, and then the core-pulling pin is pulled out after the powder filling and pressing is completed, so that a ventilated brake disc with radial channels radially distributed along the circumferential direction can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a ventilated brake disc forming mold according to one embodiment;

[0017] Figure 2 for Figure 1 A cross-sectional view of a forming die for a centrally ventilated brake disc;

[0018] Figure 3 for Figure 1 Schematic diagram of the structure of the central core-pulling needle reset device;

[0019] Figure 4 for Figure 2 A partial enlarged view of the floating support device. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] See also Figure 1 and 2 , is a ventilated brake disc forming mold 10 according to an embodiment, comprising an upper mold 11, a lower mold 13, a female mold 15 and a core column 17 which are coaxially arranged.

[0024] The ventilated brake disc forming mold 10 further includes a plurality of core-pulling inserting pins 21. The side wall of the female mold 15 is uniformly distributed along the circumferential direction with radial through holes 151 corresponding to the number of the core-pulling inserting pins 21, and the side wall of the core column 17 is uniformly distributed along the circumferential direction with blind holes 171 corresponding to the number of the core-pulling inserting pins 21. Each core-pulling inserting pin 21 is radially arranged after being inserted into the corresponding radial through hole 151 and blind hole 171.

[0025] The above-mentioned plurality of core-pulling pins 21 are arranged between the female mold 15 and the core column 17 through corresponding radial through holes 151 and blind holes 171, so that during powder filling and pressing, the force on the core-pulling pins 21 can be more uniform, avoiding deformation due to pressing, which makes it difficult to pull out.

[0026] It is understood that the number and size of the core pulling pins 21 can be designed as needed. In this embodiment, the number of the core pulling pins is 12, and after all the core pulling pins are inserted into the corresponding radial through holes and blind holes, the angle between adjacent core pulling pins is 30°.

[0027] See also Figure 1 to Figure 3The ventilated brake disc forming mold 10 further includes a female mold sleeve 19 sleeved outside the female mold 15. The upper surface of the female mold sleeve 19 is provided with guide grooves 191 corresponding to the radial through holes 151. Each guide groove 191 is provided with a core-pulling needle reset device 23.

[0028] See also Figure 3 The core-pulling needle reset device 23 includes a reset spring 231, a reset rod 233, a limit block 235 and a slider 237. The limit block 235 is fixed in the guide groove 191, one end of the reset rod 233 is sleeved with the reset spring 231, and the other end passes through the limit block 235 and is connected to the slider 237, and the slider 237 is connected to the core-pulling needle 21.

[0029] Specifically, when a thrust is applied to the reset rod 233, the reset rod 233 pushes the slider 237 to move, thereby pushing the core-pulling needle 21 through the radial through hole 151 and into the blind hole 171. At this time, the reset spring 231 is completely compressed; after the thrust is removed, the reset spring 231 rebounds and drives the reset rod 233 to retract, thereby driving the slider 237 to retract, and then driving the core-pulling needle 21 to retract, thereby realizing the automatic and rapid extraction of the core-pulling needle 21 after the pressing is completed.

[0030] See also Figure 1 and 2 The above-mentioned ventilated brake disc forming mold 10 also includes a core-pulling needle pushing device 25, which includes an upper mold base 251 and inserts 253 arranged one by one corresponding to the guide grooves 191. One end of each insert 253 is connected to the upper mold base 251, and the other end forms a pushing portion (not marked in the figure). The pushing portion has an outer surface 2531 extending along the axial direction and an inner surface 2533 extending outward away from the axial direction.

[0031] Correspondingly, each guide groove 191 is also provided with a first axial through hole 193 penetrating the female mold sleeve 19. After the pushing portion of each of the above-mentioned inserts 253 is inserted into the first axial through hole 193 of the corresponding guide groove 191, the outer surface 2531 is fitted with the limit block 235, and the inner surface 2533 is fitted with the slider 237, so that when the upper mold base 251 is pressed downward, the insert 253 is driven downward, thereby generating a thrust between the inner surface 2533 of the insert 253 and the slider 237, pushing the slider 237 to slide, thereby pushing the core-pulling needle 21 to pass through the radial through hole 151 and insert into the blind hole 171.

[0032] See also Figure 1 and 2The ventilated brake disc forming mold 10 further includes a cavity bottom plate 31 overlapped with the female mold sleeve 19, and the cavity bottom plate 31 is uniformly distributed with second axial through holes 311 corresponding to the first axial through holes 193 along the circumferential direction, and each second axial through hole 311 is provided with a wear-resistant block (not shown). After the push portion of the insert 235 is inserted into the corresponding first axial through hole 193 and the second axial through hole 311 in sequence, the outer surface 2531 is fitted with the wear-resistant block to improve the force bearing capacity of the insert 235 and prevent the insert 235 from breaking due to the block 237 being stuck.

[0033] See also Figure 2 The above-mentioned ventilated brake disc forming mold 10 also includes a lower mold base 41, and an axial channel is provided in the center of the lower mold base 41. A lower mold push rod is provided in the axial channel. One end of the lower mold push rod is connected to the lower mold 13, and the other end is connected to the cylinder (not shown).

[0034] See also Figure 2 and Figure 4 The above-mentioned ventilated brake disc forming mold 10 also includes a plurality of floating support devices 51 evenly distributed along the circumference of the lower mold base 41, and the floating support device 51 includes a support limit block 511, a support spring 513 and a support rod 515.

[0035] Furthermore, the cavity bottom plate 31 is provided with a T-shaped axial through hole 315 corresponding to the above-mentioned floating support device 51. Furthermore, the T-shaped axial through hole 315 is opened at the junction of the female mold 15 and the female mold sleeve 19.

[0036] The lower mold base 41 is provided with a third axial through hole (not marked in the figure) corresponding one-to-one to the above-mentioned floating support device 51.

[0037] Each support stopper 511 is fixed at the corresponding third axial through hole, one end of each support rod 515 is hung in the corresponding T-shaped axial through hole 315, and the other end passes through the corresponding support stopper 511 and is inserted into the corresponding third axial through hole. Each support spring 513 is sleeved on the corresponding support rod 515, one end of which is located in the corresponding support stopper 511, and the other end of which is against the cavity bottom plate 31.

[0038] The arrangement of the above-mentioned floating support device 51 can realize floating pressing of powder, thereby ensuring that the position of the core-pulling needle 21 is always located at the lowest density line, which is convenient for subsequent extraction.

[0039] See also Figure 1 and Figure 2 In the above-mentioned ventilated brake disc forming mold 10, the upper mold 11 and the core column 17 cooperate to block the upper opening of the female mold 15, and the lower mold 13 and the core column 17 cooperate to block the lower opening of the female mold 15.

[0040] Specifically, the upper mold 11 and the lower mold 13 are respectively provided with openings (not shown) matching the core column 17. The core column 17 is arranged in the opening of the lower mold 13, and the two cooperate to block the lower opening of the female mold 15. After the molds are closed, the opening of the upper mold 11 fits tightly with the core column 17, thereby blocking the upper opening of the female mold 15.

[0041] Furthermore, one end of the core column 17 close to the upper mold 11 is set in a conical shape, which can facilitate powder filling and prevent powder splashing when powder is added from the opening of the upper mold 11.

[0042] The above-mentioned brake disc forming mold 10 has radial through holes 151 evenly distributed along the circumferential direction on the side wall of the female mold 15 and the number of core-pulling pins 21 evenly distributed, and blind holes 171 evenly distributed along the circumferential direction on the side wall of the core column 17 and the number of core-pulling pins 21, so that each core-pulling pin 21 is radially arranged after passing through the corresponding radial through hole 151 and blind hole 171, and then the core-pulling pin 21 is pulled out after the powder filling and pressing is completed, so that a ventilated brake disc with radial channels radially distributed along the circumferential direction can be obtained.

[0043] 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 ventilated brake disc forming die, comprising an upper die, a lower die, a female die and a core column arranged coaxially, characterized in that: It also includes a plurality of core-pulling pins. The female mold side wall is evenly distributed with radial through holes corresponding to the number of the core-pulling pins along the circumferential direction, and the core column side wall is evenly distributed with blind holes corresponding to the number of the core-pulling pins along the circumferential direction. Each of the core-pulling pins is radially arranged after passing through the corresponding radial through hole and blind hole.

2. The ventilated brake disc forming die according to claim 1, characterized in that: The ventilated brake disc forming mold also includes a female mold sleeve sleeved outside the female mold, the upper surface of the female mold sleeve is provided with guide grooves corresponding to the radial through holes one by one, each of the guide grooves is provided with a core-pulling needle resetting device, the core-pulling needle resetting device includes a reset spring, a reset rod, a limit block and a slider, the limit block is fixedly arranged in the guide groove, the slider is slidably arranged in the guide groove, one end of the reset rod is sleeved with the reset spring, and the other end passes through the limit block and is connected to the slider, and the slider is connected to the core-pulling needle.

3. The ventilated brake disc forming die according to claim 2, characterized in that: The ventilated brake disc forming mold also includes a core-pulling needle pushing device, which includes an upper mold base and inserts arranged one by one corresponding to the guide grooves. One end of each of the inserts is connected to the upper mold base, and the other end forms a pushing portion. The pushing portion has an outer surface extending along the axial direction and an inner surface extending outward away from the axial direction.

4. The ventilated brake disc forming die according to claim 3, characterized in that: Each guide groove is also provided with a first axial through hole penetrating the female mold sleeve. After the pushing portion of each insert is inserted into the first axial through hole of the corresponding guide groove, the outer surface fits with the limit block, and the inner surface fits with the sliding block.

5. The ventilated brake disc forming die according to claim 4, characterized in that: The ventilated brake disc forming mold also includes a cavity bottom plate overlapped with the female mold sleeve, and the cavity bottom plate is evenly distributed along the circumference with second axial through holes corresponding to the first axial through holes, and each of the second axial through holes is provided with a wear-resistant block. After the pushing portion of each of the inserts is inserted into the corresponding first axial through hole and the second axial through hole in turn, the outer surface fits with the wear-resistant block.

6. The ventilated brake disc forming die according to claim 5, characterized in that: The ventilated brake disc forming mold also includes a lower mold base, which is evenly distributed with a plurality of floating support devices along the circumference of the lower mold base, each of the floating support devices includes a support limit block, a support rod and a support spring; the cavity bottom plate is provided with a T-shaped axial through hole corresponding to the floating support device one by one, and the lower mold base is provided with a third axial through hole corresponding to the floating support device one by one, each of the support limit blocks is fixed at the corresponding third axial through hole, one end of each of the support rods is hung in the corresponding T-shaped axial through hole, and the other end passes through the corresponding support limit block and is inserted into the corresponding third axial through hole, and each of the support springs is sleeved on the corresponding support rod, one end of which is located in the corresponding support limit block, and the other end is against the cavity bottom plate.

7. The ventilated brake disc forming die according to claim 6, characterized in that: An axial channel is arranged at the center of the lower die base, a lower die ejector rod is arranged in the axial channel, one end of the lower die ejector rod is connected to the lower die, and the other end is connected to the oil cylinder.

8. The ventilated brake disc forming die according to any one of claims 1 to 7, characterized in that: One end of the core column close to the upper mold is tapered.

9. The ventilated brake disc forming die according to claim 8, characterized in that: The upper mold cooperates with the core column to block the upper opening of the female mold; the lower mold cooperates with the core column to block the lower opening of the female mold.

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