Pull-type auxiliary demolding device

Abstract

The invention provides a traction type auxiliary demolding device, and relates to the field of cylindrical part demolding. The traction type auxiliary demolding device comprises a forming mold and a traction mechanism, the forming mold comprises an upper mold body and a lower mold body which are detachably connected, and the upper mold body and the lower mold body are coaxially arranged; the upper mold comprises at least two splicing parts, the splicing parts are sequentially connected in the circumferential direction of the forming mold, and the adjacent splicing parts are detachably connected; the traction mechanism comprises an extension plate arranged in the circumferential direction of the lower die. The extension plate is provided with at least two driving parts, the number of the driving parts is the same as that of the splicing parts, and a driving shaft of each driving part is connected with the outer walls of the different splicing parts and used for driving the splicing parts to be spliced or separated. The outer wall of the barrel-shaped part can be exposed, so that an operator can directly act on the outer wall of the barrel-shaped part when taking out the barrel-shaped part, and the inner wall of the barrel-shaped part is prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the field of demolding of cylindrical parts, in particular to a traction-assisted demolding device. Background Art

[0002] As a basic component widely used in industrial production, the optimization of the manufacturing process of cylindrical parts has always been an important topic in the field of machining. In manufacturing processes such as injection molding, powder metallurgy, and composite material winding, the mold demolding link is often the key node restricting production efficiency and product quality. Traditional cylindrical part demolding technologies generally adopt an integral mold structure, and during the demolding process, it is necessary to apply an ejection force from the inside of the workpiece by means of an ejection mechanism or a pneumatic device. This conventional method exposes significant technical defects in practical applications: due to the structural characteristics of cylindrical parts, their inner walls are usually designed with relatively thin wall thicknesses or precise internal thread structures, and stress concentration is extremely likely to occur under the action of demolding external forces. According to the process statistical report of a certain automobile parts manufacturer, the inner wall crack incidence rate of aluminum alloy cylindrical parts produced by the traditional internal ejection demolding process is as high as 12%, seriously affecting the sealing performance and structural strength of the products.

[0003] In recent years, with the popularization of high-precision ceramic components and carbon fiber composite cylindrical parts, this problem has become increasingly prominent. These materials often exhibit extremely high outer wall strengths (usually up to 300 - 500 MPa) after curing and molding, but their inner walls usually have microporous structures or resin-rich regions due to the molding process limitations, and the shear strength is only 1 / 3 to 1 / 5 of the outer wall. To solve this contradiction, the prior art mostly adopts a segmented mold design, but generally has the problem of too high structural complexity. For example, the radial split mold device disclosed in Patent CN20181023567.3, although it realizes non-contact demolding, the hydraulic linkage mechanism adopted by it increases the mold weight by 40%, and additional cooling pipelines need to be configured, significantly increasing the equipment manufacturing cost and maintenance difficulty. More notably, in the manufacturing fields of medical devices and optical devices, the inner walls of cylindrical parts often need to be mirror-polished or coated, and any micron-level scratch will cause the product to be scrapped, which poses a stringent requirement of zero contact for the demolding process.

[0004] The current technological development presents an obvious contradictory situation: on the one hand, new engineering materials put forward higher non-contact requirements for the demoulding process; on the other hand, when existing demoulding devices achieve non-contact demoulding, they often need to sacrifice structural reliability or significantly increase production costs. This technical bottleneck directly leads to the backward process that high-end cylindrical parts still rely on manual demoulding. According to industry research, in the manufacturing of aerospace composite cylindrical parts, 35% of enterprises still use the manual knocking demoulding method, which is not only inefficient (the demoulding time for a single piece is about 25 minutes), but also has a hidden damage risk as high as 8%. This situation seriously restricts the automation process in the high-end manufacturing field, and it is urgent to develop a new demoulding device to break through the existing technical difficulties. Summary of the Invention

[0005] To solve the above problems, the present invention provides a traction-assisted demoulding device, which can expose the outer wall of the cylindrical part, so that the operator can directly act on the outer wall of the cylindrical part when removing the cylindrical part, preventing damage to the inner wall of the cylindrical part.

[0006] The present invention provides a traction-assisted demoulding device, including a forming die and a traction mechanism. The forming die includes a detachable upper die and a lower die, and the upper die and the lower die are coaxially arranged; the upper die includes at least two splicing parts, and each splicing part is sequentially connected in the circumferential direction of the forming die, and the adjacent splicing parts are detachably connected; the traction mechanism includes an extension plate arranged along the circumferential direction of the lower die; at least two driving parts are arranged on the extension plate, and the number of the driving parts is the same as the number of the splicing parts. The driving shaft of each driving part is respectively connected to the outer wall of a different splicing part, and is used to drive the splicing or separation between the splicing parts.

[0007] In a feasible embodiment, a support frame is arranged on the extension plate, and the driving parts are arranged on the support frame.

[0008] In a feasible embodiment, a diagonal brace is further arranged between the extension plate and the outer wall of the lower die.

[0009] In a feasible embodiment, the traction-assisted demoulding device further includes a sliding part and a track. The sliding part is arranged at the bottom of the splicing part, and a roller group is further arranged at the bottom of the sliding part. The roller group includes a plurality of rollers arranged in sequence; the top surface of the extension plate is flush with the top surface of the lower die, and the track straddles the top surface of the extension plate and the top surface of the lower die, and the rollers are slidably connected to the track.

[0010] In a feasible embodiment, a groove is arranged on the top surface of the lower die, and the inner bottom surface of the groove is flush with the top surface of the extension plate, and the track straddles the upper surface of the extension plate and the inner bottom surface of the groove.

[0011] In a feasible embodiment, a clamping groove is provided at the bottom of the splicing part, and a clamping block is provided at the top of the sliding part, and the clamping block is arranged in the clamping groove.

[0012] In a feasible embodiment, part of the sliding part is located outside the upper mold, and a buffer plate is provided at the end of this part of the upper mold.

[0013] In a feasible embodiment, the roller group includes a first roller group and a second roller group. The first roller group is arranged at the bottom of the sliding part outside the upper mold, and the second roller group is arranged at the bottom of the remaining part of the sliding part; both the first roller group and the second roller group include a plurality of rollers arranged in sequence.

[0014] In a feasible embodiment, the number of both the driving parts and the splicing parts is 4, and the driving parts are arranged around the upper mold at equal angles.

[0015] The present invention also provides a method for using a traction-assisted demolding device, including the following steps:

[0016] Step 1) The driving shaft of the driving part retracts, driving the splicing part to move away from the central axis of the cylindrical part;

[0017] Step 2) Take out the cylindrical part from the lower mold.

[0018] The traction-assisted demolding device provided by the present invention has the following beneficial effects: When using the present invention to demold the cylindrical part, the driving shaft of the driving part retracts, driving the splicing part away from the outer wall of the cylindrical part, so that the outer wall of the cylindrical part can be exposed. If the outer wall of the cylindrical part is not exposed, when taking out the cylindrical part, it is necessary to use a tool to contact the inner wall of the cylindrical part and then take out the cylindrical part. The inner wall of the cylindrical part is relatively fragile compared to the outer wall, and it is easy to produce cracks or even break once an external force is applied. Therefore, the present invention can expose the outer wall of the cylindrical part, so that the operator can directly act on the outer wall of the cylindrical part when taking out the cylindrical part, preventing damage to the inner wall of the cylindrical part. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a top view of the splicing part of the present invention when splicing.

[0021] Figure 3 It is a top view of another embodiment of the splicing part of the present invention when splicing.

[0022] Figure 4 It is a top view of the splicing part of the present invention when separated.

[0023] Reference Signs

[0024] Molding die 1

[0025] Upper die 11

[0026] Splicing part 11.1

[0027] Card slot 11.2

[0028] Lower die 12

[0029] Groove 12.1

[0030] Traction mechanism 2

[0031] Extension plate 21

[0032] Driver 22

[0033] Support frame 23

[0034] Diagonal brace 24

[0035] Slider 3

[0036] Roller 31

[0037] Buffer plate 32

[0038] Block 33

[0039] Track 4

[0040] Cylindrical part 5 Specific implementation mode

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "left side", "right side", "upper side", "lower side", "above", "below", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0044] An embodiment of the present invention provides a traction-assisted demolding device. Refer to Figure 1 , which includes a molding die 1 and a traction mechanism 2. The molding die 1 includes an upper die 11 and a lower die 12 that are detachably connected. The upper die 11 and the lower die 12 are coaxially arranged. The molding die 1 is used to load a cylindrical part 5. Since the outer wall of the cylindrical part 5 usually needs to fit with the inner wall of the molding die 1, the inner walls of the lower die 12 and the upper die 11 should be kept flush. Preferably, the outer walls of the lower die 12 and the upper die 11 should also be kept flush. Refer to Figures 2 to 4 , the upper die 11 includes at least two splicing parts 11.1. Each of the splicing parts 11.1 is sequentially connected in the circumferential direction of the molding die 1, and the adjacent splicing parts 11.1 are detachably connected. Generally, the cut surface between adjacent splicing parts 11.1 is an uneven cut surface, so as to increase the contact area between adjacent splicing parts 11.1 and improve the stability of the upper die 11 when all the splicing parts 11.1 are spliced together to form the upper die 11. Refer to Figures 1 to 3 , the traction mechanism 2 includes an extension plate 21 arranged along the circumferential direction of the lower die 12. At least two driving parts 22 are provided on the extension plate 21. The number of the driving parts 22 is the same as the number of the splicing parts 11.1. The driving shafts of each driving part 22 are respectively connected to the outer walls of different splicing parts 11.1, and are used to drive the splicing or separation between the splicing parts 11.1. Splicing is as shown in Figure 2 or Figure 3 , all the splicing parts 11.1 are sequentially connected to form the upper die 11. Separation is as shown in Figure 4 , all the splicing parts 11.1 move radially away from the cylindrical part 5 along the molding die 1, so that each splicing part 11.1 is far away from the outer wall of the cylindrical part 5 and becomes an independent individual. In an improved embodiment, as shown in Figure 2As shown, the extension plate 21 can be set as multiple independent extension plates 21. A driving member 22 is provided on each extension plate 21, and each driving member 22 is matched with a splicing part 11.1. In this way, the weight of the extension plate 21 itself can be reduced, thereby reducing the hanging pressure on the outer wall of the lower mold 12. When demolding the cylindrical part 5 using the present invention, the drive shaft of the driving member 22 retracts, driving the splicing part 11.1 to move radially away from the outer wall of the cylindrical part 5 along the forming mold 1, so that part of the outer wall of the cylindrical part 5 can be exposed. If part of the outer wall of the cylindrical part 5 is not exposed, when removing the cylindrical part 5, it is necessary to use a tool to contact the inner wall of the cylindrical part 5 and then remove the cylindrical part 5. However, the inner wall of the cylindrical part 5 is relatively fragile compared to the outer wall, and it is easy to produce cracks or even break once an external force is applied. Therefore, the present invention can expose part of the outer wall of the cylindrical part 5, enabling the operator to directly act on the outer wall of the cylindrical part 5 when removing the cylindrical part 5 and preventing damage to the inner wall of the cylindrical part 5.

[0045] In the traction-assisted demolding device provided by the embodiment of the present invention, referring to Figure 1 , a support frame 23 is provided on the extension plate 21, the driving member 22 is arranged on the support frame 23, and the support frame 23 and the extension plate 21 are usually arranged at a right angle. The driving member 22 can be any one of a driving motor, a cylinder, or an oil cylinder. In a feasible implementation manner, the support frame 23 and the extension plate 21 are integrally formed, and the outer wall of the support frame 23 is flush with the outer wall of the extension plate 21.

[0046] In the traction-assisted demolding device provided by the embodiment of the present invention, referring to Figure 1 , an inclined support 24 is further provided between the extension plate 21 and the outer wall of the lower mold 12. Generally, the number of inclined supports 24 can be the same as the number of driving members 22, and the support frame 23 and the driving member 22 can be located above the inclined support 24 to strengthen the support of this part of the extension plate 21 and ensure the stability of the driving member 22 during operation.

[0047] In the traction-assisted demolding device provided by the embodiment of the present invention, referring to Figure 1 , the auxiliary demolding device further includes a sliding member 3 and a track 4. The sliding member 3 is arranged at the bottom of the splicing part 11.1, and a roller group is further provided at the bottom of the sliding member 3. The roller group includes a plurality of rollers 31 arranged in sequence; the top surface of the extension plate 21 is flush with the top surface of the lower mold 12, the track 4 is spanned on the top surfaces of the extension plate 21 and the lower mold 12, and the rollers 31 are slidably connected to the track 4. When the drive shaft of the driving member 22 retracts inward, the splicing part 11.1 is pulled outwards by the drive shaft of the driving member 22. At this time, the rollers 31 located at the bottom of the splicing part 11.1 roll on the track 4 to maintain the stability of the splicing part 11.1 when it is pulled out.

[0048] In the traction-assisted demolding device provided by the embodiments of the present invention, referring to Figure 1 , a groove 12.1 is provided on the top surface of the lower mold 12, the inner bottom surface of the groove 12.1 is flush with the top surface of the extension plate 21, and the track 4 is spanned on the upper surface of the extension plate 21 and the inner bottom surface of the groove 12.1. As an illustration, when the drive shaft of the driving member 22 extends, a part of the sliding member 3 is located in the groove 12.1. At the same time, a part of the inner wall of the lower mold 12 is retained, and the retained inner wall has a certain thickness. During the process of the splicing part 11.1 being pulled outwards by the driving member 22, a part of the bottom surface of the splicing part 11.1 will slide on the top surface of the inner wall of the lower mold 12. In this way, the inner wall of this part of the lower mold 12 can provide stability for the movement of the splicing part 11.1. At the same time, when the drive shaft of the driving member 22 retracts to the maximum limit, it should be ensured that a part of the bottom surface of the splicing part 11.1 still remains in contact with the inner wall of the lower mold 12. If the splicing part 11.1 is completely pulled out (that is, the splicing part 11.1 is completely separated from the top surface of the inner wall of the lower mold 12), then an error will occur during the splicing of the splicing part 11.1 (after the splicing part 11.1 is completely pulled out, the bottom surface of the splicing part 11.1 may deviate from the top surface of the inner wall of the lower mold 12 due to factors such as gravity or jitter). Therefore, when the drive shaft of the driving member 22 retracts to the maximum limit, the contact between the bottom surface of the splicing part 11.1 and the top surface of the inner wall of the lower mold 12 can ensure the accuracy during the splicing of the splicing part 11.1.

[0049] In the traction-assisted demolding device provided by the embodiments of the present invention, referring to Figure 1 , a clamping groove 11.2 is provided at the bottom of the upper mold 11, and a clamping block 33 is provided at the top of the sliding member 3. The clamping block 33 is arranged in the clamping groove 11.2 to strengthen the connection strength between the sliding member 3 and the bottom of the upper mold 11.

[0050] In the traction-assisted demolding device provided by the embodiments of the present invention, referring to Figure 1 , a part of the sliding member 3 is located outside the upper mold 11, and a buffer plate 32 is provided at the end of this part of the upper mold 11. In a feasible embodiment, when the drive shaft of the driving member 22 retracts a certain distance, the end of the part of the sliding member 3 located outside the upper mold 11 abuts against the inner wall of the support plate, thereby preventing the drive shaft of the driving member 22 from further retracting and realizing physical limitation of the driving member 22. The buffer plate 32 can provide buffering when the end of the sliding member 3 contacts the inner wall of the support plate to prevent collision between the two.

[0051] In the traction-assisted demolding device provided by the embodiments of the present invention, referring to Figure 1, a first roller set is provided at the bottom of the sliding member 3 located outside the upper mold 11, and a second roller set is provided at the bottom of the remaining part of the sliding member 3; both the first roller set and the second roller set include a plurality of rollers 31 arranged in sequence. In a specific embodiment, the first roller set includes three rollers 31 arranged in sequence, and the second roller set also includes three rollers 31 arranged in sequence. Separating the first roller set and the second roller set can improve the stability of the sliding member 3 when sliding.

[0052] In the traction-assisted demolding device provided by the embodiment of the present invention, with reference to Figures 1 to 4 , the number of both the driving member 22 and the splicing portion 11.1 is 4, and the driving members 22 are arranged around the upper mold 11 at equal angles.

[0053] The embodiment of the present invention also provides a method for using a traction-assisted demolding device, including the following steps:

[0054] Step 1) The drive shaft of the driving member 22 retracts, driving the splicing portion 11.1 to move away from the central axis of the cylindrical member 5;

[0055] Step 2) Take out the cylindrical member 5 from the lower mold 12.

[0056] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A traction-assisted demoulding device, characterized in that: It includes a forming die (1) and a traction mechanism (2). The forming die (1) includes an upper die (11) and a lower die (12) that are detachably connected, and the upper die (11) and the lower die (12) are coaxially arranged. The upper die (11) includes at least two splicing parts (11.1), and each of the splicing parts (11.1) is sequentially connected in the circumferential direction of the forming die (1), and the adjacent splicing parts (11.1) are detachably connected. The traction mechanism (2) includes an extension plate (21) arranged along the circumferential direction of the lower die (12). At least two driving parts (22) are provided on the extension plate (21), and the number of the driving parts (22) is the same as the number of the splicing parts (11.1). The driving shafts of each driving part (22) are respectively connected to the outer walls of different splicing parts (11.1) to drive the splicing or separation between the splicing parts (11.1).

2. The traction-assisted demolding device according to claim 1, characterized in that: A support frame (23) is provided on the extension plate (21), and the driving part (22) is arranged on the support frame (23).

3. The traction-assisted demoulding device according to claim 1, wherein: An inclined strut (24) is further provided between the outer wall of the extension plate (21) and the lower die (12).

4. The traction-assisted demoulding device according to claim 1, characterized in that: The traction-assisted demoulding device further includes a sliding part (3) and a track (4). The sliding part (3) is arranged at the bottom of the splicing part (11.1), and a roller group is further provided at the bottom of the sliding part (3). The roller group includes a plurality of rollers (31) arranged in sequence. The top surface of the extension plate (21) is flush with the top surface of the lower die (12). The track (4) straddles and is arranged on the top surface of the extension plate (21) and the top surface of the lower die (12), and the roller (31) is slidably connected to the track (4).

5. The traction-assisted demolding device according to claim 4, characterized in that: A groove (12.1) is provided on the top surface of the lower die (12), and the inner bottom surface of the groove (12.1) is flush with the top surface of the extension plate (21). The track (4) straddles and is arranged on the upper surface of the extension plate (21) and the inner bottom surface of the groove (12.1).

6. The traction-assisted demolding device according to claim 4, characterized in that: A clamping groove (11.2) is provided at the bottom of the splicing part (11.1), and a clamping block (33) is provided at the top of the sliding part (3). The clamping block (33) is arranged in the clamping groove (11.2).

7. The traction-assisted demolding device according to claim 4, wherein: Part of the sliding part (3) is located outside the upper die (11), and a buffer plate (32) is provided at the end of this part of the upper die (11).

8. The traction-assisted demoulding device according to claim 7, characterized in that: The roller group (31) includes a first roller group and a second roller group. The first roller group is arranged at the bottom of the sliding part (3) outside the upper die (11), and the second roller group is arranged at the bottom of the remaining part of the sliding part (3). Both the first roller group and the second roller group include a plurality of rollers (31) arranged in sequence.

9. The traction-assisted demoulding device according to claim 1, wherein: The number of the driving parts (22) and the splicing parts (11.1) is 4, and each of the driving parts (22) is arranged around the upper die (11) at equal angles.

10. A method for using the traction-assisted demoulding device according to any one of claims 1 to 9, including the following steps: Step 1) The driving shaft of the driving part (22) retracts, driving the splicing part (11.1) to move away from the central axis of the cylindrical part (5). Step 2) Remove the cylindrical part (5) from the lower mold (12).

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