A mold releasing device and a mold releasing method

Abstract

The application provides a demolding device and a demolding method, which comprise an upper mold, a lower mold, a demolding plate and a connecting motion mechanism. The demolding plate is located between the upper mold and the lower mold. The connecting motion mechanism comprises a plurality of connecting members which are vertically arranged and used for connecting the upper mold and the demolding plate. When the upper mold moves upward to complete the demolding of the upper mold, the connecting members are driven to move upward synchronously. Then, the demolding plate is driven to move upward synchronously through the connecting members, so as to complete the demolding of the lower mold. The connecting motion mechanism is adopted. The connecting members are driven to move upward by the press machine when the upper mold moves upward, and then the demolding plate is driven to move upward for the demolding of the lower mold. The traditional mode that the upper mold and the lower mold are separated and independently demolded is broken. The mold opening movement is more balanced and stable, and is safer and more reliable. The linkage of the upper mold and the demolding plate is realized. The white mold is automatically demolded from the lower mold, and the automatic demolding is realized.

Description

Technical Field

[0001] This invention relates to the field of lost foam casting technology, and in particular to a demolding device and demolding method. Background Technology

[0002] Lost foam casting, a special casting process developed and perfected abroad in the 1980s and 1990s, is hailed by the casting industry as a "green revolution in the casting industry" and "21st-century casting technology." Also known as negative pressure casting (EPC), lost foam casting uses expandable polystyrene (EPS) as raw material to create foam patterns (foam white molds) for casting. As a major approach to green and intensive casting, lost foam casting will undoubtedly occupy an increasingly important position in casting production. As a new manufacturing process, its advantages are becoming increasingly apparent in today's society, especially in energy conservation, environmental protection, reducing energy consumption and production costs, which will have a profound impact on the manufacturing industry.

[0003] While the lost foam casting industry has seen significant development in recent years and gradually become an important part of the manufacturing industry, several problems and challenges remain. Currently available lost foam casting molds suffer from low automation, low production efficiency leading to high costs and unstable quality. Structurally, existing upper and lower molds are separate, independent demolding structures. The upper mold is automatically demolded by equipment, while the lower mold is often demolded manually or by externally connected ejection mechanisms using multiple cylinders, springs, racks, etc. Manual demolding is complex, inefficient, and safety-critical. Externally connected molds are complex and expensive, and many factors affect the stability of synchronous mold opening during actual use, making it difficult to determine the causes and control the process, indirectly impacting safe operation. Poor synchronization of ejection at the four corners of the mold surface easily leads to deformation of the lost foam pattern and a high scrap rate. Poor existing processability also results in high mold costs and subsequent mold production and maintenance costs.

[0004] Therefore, it is necessary to provide a demolding device and demolding method to overcome the defects mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a demolding device and a demolding method.

[0006] According to one aspect of the present invention, a demolding device is provided, comprising:

[0007] upper mold;

[0008] Lower mold;

[0009] A stripper template, located between the upper and lower molds;

[0010] The connecting motion mechanism includes multiple vertically arranged connecting members for connecting the upper mold and the demolding template. When the upper mold moves upward to complete the demolding of the upper mold, it drives the connecting members to move upward synchronously. Then, the connecting members drive the demolding template to move upward synchronously, thereby completing the demolding of the lower mold.

[0011] Preferably, the connecting motion mechanism further includes upper connecting seats on both sides of the upper mold and lower connecting seats on both sides of the demolding plate and corresponding to the upper connecting seats. The upper connecting seats are in contact with the top end of the connector, and the lower connecting seats are used to contact the bottom end of the connector.

[0012] Preferably, the connector is an I-shaped connecting rod, which includes a rod body and an upper stop block and a lower stop block located at the upper and lower ends of the rod body. The upper connecting seat supports the upper stop block, and the lower stop block is located below the lower connecting seat.

[0013] Preferably, the upper connecting seat is located on the upper part of the upper mold, is U-shaped and horizontally arranged, and includes a first arm and a second arm that extend horizontally outward from the side wall of the upper mold and are used to support the upper stop block. A first slot is provided between the first arm and the second arm for the rod to pass through.

[0014] Preferably, the lower connecting seat includes a vertical plate fixed to the template and a third arm and a fourth arm that are horizontally bent outward from the top of the vertical plate and supported by a lower stop block. A second slot is provided between the third arm and the fourth arm for the rod to pass through.

[0015] Preferably, both the upper and lower connecting seats are provided with locking baffles on their outer end faces. One end of the locking baffle is rotatably connected to the first support arm, and the other end of the locking baffle is movably locked and fixed to the outer end of the second support arm, thereby limiting the connection and preventing it from falling out of the slot.

[0016] Preferably, the locking baffle at the outer end of the lower connecting seat and its configuration are the same as those of the locking baffle of the upper connecting seat.

[0017] Preferably, the lower mold includes a lower mold core, and a push rod is fixed on the ejector plate, the push rod passing through the lower mold core and moving synchronously with the ejector plate.

[0018] According to another aspect of the present invention, a demolding method for a demolding device is provided, comprising:

[0019] S1: Before demolding, open the locking baffle on the upper connecting seat and the locking baffle on the lower connecting seat, place the connector in the slots in the upper and lower connecting seats, and close the locking baffle;

[0020] S2: After the white mold is formed, the upper mold is demolded and lifted upward by a press to separate it from the white mold.

[0021] S3: The upper mold continues to move upward, and the connecting parts move upward synchronously under the drive of the upper mold;

[0022] S4: During the upward process, the connecting rod makes contact with the lower connecting seat, thereby driving the demolding template to move upward synchronously, so that the white mold can be completely separated from the lower mold and the white mold can be ejected and demolded.

[0023] S5: Remove the white mold using a robotic arm or manually;

[0024] S6: After taking out the mold, close the mold.

[0025] Preferably, in step S3, the upper stop block at the top of the connector supports the first and second arms of the first connecting seat, and the upper mold drives the connector to move upward synchronously through the first connecting seat; in step S4, the lower stop block at the bottom of the connector contacts and supports the third and fourth arms of the second connecting seat. At this time, the connector will drive the demolding template to move upward synchronously, and the demolding template moves upward as a whole, which drives the ejector rod inside the lower mold core to move upward together, thereby ejecting the white mold and completing the demolding of the lower mold.

[0026] Compared with the prior art, the demolding device and demolding method provided by the present invention have the following beneficial effects:

[0027] Due to the adoption of the above technical solution, this invention has the advantages of simple structure, ingenious design, and low cost. It adopts a connecting motion mechanism, which uses a press to move the upper mold upward, thereby moving the connecting parts upward, and then moving the ejector plate upward to demold the lower mold. This breaks the traditional mode of separate and independent demolding of the upper and lower molds. The mold opening movement is more balanced, stable, safer, and more reliable. It realizes the linkage between the upper mold and the ejector plate, so that the white mold can be automatically demolded from the lower mold, realizing automated demolding, simplifying the process, with high applicability and high work efficiency. The lower mold does not need to set up or add other complex external ejection motion mechanisms to achieve automated demolding efficiently, which greatly improves the mold processability, reduces manufacturing costs, and also improves the quality of the lost foam pattern (foam white film). Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1 This is a perspective view of the demolding device of the present invention;

[0030] Figure 2 for Figure 1 Enlarged view of point A;

[0031] Figure 3This is a partially enlarged view of the demolding device of the present invention;

[0032] Figure 4 This is a perspective view of the connecting rod of the present invention;

[0033] Figure 5 This is a diagram showing the state of the demolding device of the present invention after mold closing;

[0034] Figure 6 for Figure 5 A cross-sectional view of the BB side;

[0035] Figure 7 This is a diagram showing the state of the demolding device of the present invention when the upper mold is demolded and moves upward to support the lower stop and the lower connecting seat.

[0036] Figure 8 This is a diagram showing the state of the demolding device of the present invention after the lower mold has been demolded;

[0037] Figure 9 This is a diagram showing the state of the demolding device of the present invention after removing the white mold;

[0038] Figure 10 This is a top view of the lower mold of the present invention;

[0039] Figure 11 This is a flowchart of the demolding method of the present invention.

[0040] Among them, 1. Upper mold, 2. Lower mold, 21. Lower mold core, 22. Guide hole, 3. Release plate, 31. Ejector rod, 32. Connecting plate, 33. Conical guide, 34. Positioning pin, 4. Connecting piece, 41. Rod body, 42. Upper stop block, 43. Lower stop block, 5. Upper connecting seat, 51. First support arm, 52. Second support arm, 53. First slot, 6. Lower connecting seat, 61. Vertical plate, 62. Third support arm, 63. Fourth support arm, 64. Second slot, 7. Locking baffle, 71. Slot, 72. Limiting pin, 8. Edge, 9. White mold. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0043] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0047] See Figure 1 This embodiment discloses a demolding device, including an upper mold 1, a lower mold 2, a demolding template 3 located between the upper mold 1 and the lower mold 2, and a connecting motion mechanism. The connecting motion mechanism includes four vertically arranged connecting members 4 that connect the upper mold 1 and the demolding template 3. When the upper mold 1 completes demolding and moves upward, it drives the connecting members 4 to move upward synchronously, and then drives the demolding template 3 to move upward synchronously through the connecting members 4, thereby completing the demolding of the lower mold 2.

[0048] The connecting motion mechanism also includes four upper connecting seats 5 and four lower connecting seats 6. The four upper connecting seats 5 are symmetrically arranged on both sides of the upper mold 1 and near the four corners, and are all located at the upper part of the side wall of the upper mold 1. The four lower connecting seats 2 are symmetrically arranged on both sides of the demolding template 3 and are arranged vertically corresponding to the upper connecting seats 5.

[0049] See Figure 4The connector 4 is an I-shaped connecting rod, comprising a rod body 41 and upper and lower stops 42 and 43 located at the upper and lower ends of the rod body 41, respectively. The upper connecting seat 5 supports the upper stop 42, and the lower stop 43 is located below the lower connecting seat 6. During the upward movement of the connector 4, the lower stop 43 contacts and supports the lower connecting seat 6, thereby causing the lower connecting seat 6 to move upward. In other embodiments, the connector 4 may also be a soft rope or chain with support members at both ends for supporting the upper and lower connecting seats.

[0050] See Figure 2 and Figure 3 The upper connecting seat 5 is U-shaped and horizontally arranged. The upper connecting seat 5 includes a first arm 51 and a second arm 52 extending horizontally outward from the side wall of the upper mold 1. A first slot 53 for the rod 41 to pass through is provided between the first arm 51 and the second arm 52. An upper stop 42 is provided on the first arm 51 and the second arm 52, and the first arm 51 and the second arm 52 are used to support the upper stop 42. The ends of the first arm 51 and the second arm 52 are provided with upwardly extending flanges 8, which are used to limit the upper stop 42 on the upper connecting seat 5 and prevent it from sliding out of the first slot 53.

[0051] The lower connecting seat 6 is U-shaped when viewed from above and “Г”-shaped when viewed from the side. The lower connecting seat 6 includes a vertical plate 61 fixed to the release template 3 and a third arm 62 and a fourth arm 63 that bend horizontally outward from the top of the vertical plate 61. A second slot 64 for the connector 4 to pass through is provided between the third arm 62 and the fourth arm 63. During the upward movement of the connector 4, the third arm 62 and the fourth arm 63 are supported by the lower stop 43, thereby receiving an upward force and moving upward together with the lower stop 43.

[0052] See Figure 2 Both the upper connecting seat 5 and the lower connecting seat 6 have locking baffles 7 on their outer end faces. One end of the locking baffle 7 is a limiting end, which is rotatably connected to the first support arm 51. The other end of the locking baffle 7 is a free end, which can rotate axially around the limiting end. The movable end has a slot 71, which can be rotated to engage with the limiting pin 72 fixed at the outer end of the second support arm 52, thereby limiting the connecting piece 4 and preventing it from falling out of the slot. The locking baffle 7 at the outer end of the lower connecting seat 6 has the same shape and uses the same installation method as the locking baffle 7 at the upper connecting seat 5.

[0053] See Figure 5 , Figure 6 , Figure 8 and Figure 10The lower mold 2 includes a lower mold core 21, which is fixed to the lower mold 2. A push rod 31 is fixed to the ejector plate 3 via a connecting plate 32 fixed to the bottom of the ejector plate 3. The push rod 31 passes through the lower mold core 21 and moves synchronously with the ejector plate 3, used to push the white mold 9 (disappearing mold pattern) out of the lower mold core 21, thus completely separating it from the lower mold 2. The upper surface of the ejector plate 3 is provided with multiple positioning pins 34, and the upper mold has positioning holes (not shown in the figure) corresponding to the positioning pins 34, facilitating accurate and rapid mold closing. Vertically downward extending tapered guide members 33 are also provided at the four corners of the ejector plate 3, and guide holes 22 are provided on the lower mold 2 corresponding to the tapered guide members 33, facilitating accurate and rapid mold closing. The shape of the white mold is not limited to the shape in this embodiment; different shapes of molds can be selected to form different shapes of white mold 9 according to different needs.

[0054] This embodiment utilizes an automated demolding device combining an integrated "I"-shaped connector 4, an assembled "Г"-shaped lower connecting seat 6, and a rotary locking baffle 7. The lower mold 2 is demolded under the coordinated action of the upper mold 1 and the demolding platen 3, breaking away from the traditional separate demolding approach. By directing force in one direction, it is more stable and efficient than any additional external ejection mechanism, resulting in a more balanced, stable, safe, and reliable mold opening motion. The unique design of linking the upper mold 1 and the demolding platen 3—meaning that after the upper mold 1 opens, it continues to move, thereby simultaneously driving the demolding platen 3 to move, allowing the white mold 9 to demold from the lower mold 2—simplifies the process, leverages existing forces, and is highly efficient. The connecting component 4 in the connecting motion mechanism features an integrated "I"-shaped structure design, reducing assembly errors and ensuring more horizontal and synchronized lifting of the lower mold 2, resulting in smoother mold opening and ascent. The lower connecting seat 6 adopts an assembled "Г"-shaped structure design, allowing for the use of a shorter connecting component 4 while ensuring the upper mold is lifted to the preset height. This effectively shortens the length of the "I"-shaped connecting component 4, avoiding assembly interference caused by excessive length, and making the linkage mold opening more stable. It also allows for effective utilization of the press's vertical stroke. The lower mold 2 does not require additional complex external ejection mechanisms, and this connecting motion mechanism achieves automated demolding safely, ingeniously, stably, practically, and efficiently, greatly improving mold processability, reducing manufacturing costs, and enhancing the quality of the white mold 9.

[0055] See Figure 5 , Figure 7 , Figure 8 and Figure 9 This embodiment also provides a demolding method for a demolding device, including:

[0056] S1: Before installing the upper mold 1 and the press, fit the upper mold 1, the stripping plate 3 and the lower mold 2 together, open the locking baffle 7 on the upper connecting seat 5 and the locking baffle 7 on the lower connecting seat 6, place the connector 4 in the first slot 53 on the upper connecting seat 5 and the second slot 64 on the lower connecting seat 7, and close the corresponding locking baffle 7.

[0057] S2: After the white mold 9 is formed, the upper mold 1 is demolded and lifted upward by a press to separate it from the white mold 9.

[0058] S3: The upper mold 1 continues to move upward, and the connecting piece 4 moves upward synchronously under the drive of the upper mold 1;

[0059] S4: During the upward process, the connecting rod 4 makes contact with the lower connecting seat 6, thereby driving the demolding template 3 to move upward synchronously, so that the white mold 9 can completely separate from the lower mold 2 and complete the ejection and demolding of the white mold 9;

[0060] S5: Remove the white mold 9 using a robotic arm or manually;

[0061] S6: After taking out the mold, close the mold.

[0062] In step S3, the upper stop 42 at the top of the connector 4 supports the first arm 51 and the second arm 52 of the upper connecting seat 5. The upper mold 1 drives the connector 4 to move upward synchronously through the upper connecting seat 5. In step S4, the lower stop 43 at the bottom of the connector 4 contacts and supports the third arm 62 and the fourth arm 63 of the lower connecting seat 6. At this time, the connector 4 will drive the demolding template 3 to move upward synchronously. The upward movement of the demolding template 3 as a whole drives the ejector rod 31 inside the lower mold core 21 to move upward together, thereby ejecting the white mold 9 and completing the demolding of the lower mold 2.

[0063] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A demolding device, characterized in that, include: upper mold; Lower mold; A stripper template, located between the upper and lower molds; The connecting motion mechanism includes multiple vertically arranged connecting pieces for connecting the upper mold and the demolding template. When the upper mold moves upward to complete the demolding of the upper mold, it drives the connecting pieces to move upward synchronously. Then, the connecting pieces drive the demolding template to move upward synchronously, thereby completing the demolding of the lower mold. The connecting motion mechanism also includes upper connecting seats on both sides of the upper mold and lower connecting seats on both sides of the demolding plate and corresponding to the upper connecting seats. The upper connecting seats are in contact with the top end of the connector, and the lower connecting seats are used to contact the bottom end of the connector. The connector is an "I"-shaped connecting rod, which includes a rod body and an upper stop block and a lower stop block located at the upper and lower ends of the rod body. The upper connecting seat supports the upper stop block, and the lower stop block is located below the lower connecting seat. The upper connecting seat is located on the upper part of the upper mold, is U-shaped and horizontally arranged. The upper connecting seat includes a first arm and a second arm that extend horizontally outward from the side wall of the upper mold and are used to support the upper stop block. A first slot is provided between the first arm and the second arm for the rod to pass through. The lower connecting seat includes a vertical plate fixed to the template and a third arm and a fourth arm that are horizontally bent outward from the top of the vertical plate and supported by a lower stop block. A second slot is provided between the third arm and the fourth arm for the rod body to pass through. Both the upper connecting seat and the lower connecting seat are provided with locking baffles on their outer end faces. One end of the locking baffle is rotatably connected to the first support arm, and the other end of the locking baffle is movably locked and fixed to the outer end of the second support arm, thereby limiting the connection and preventing it from falling out of the slot. The lower mold includes a lower mold core, and a push rod is fixed on the ejector plate. The push rod passes through the lower mold core and moves synchronously with the ejector plate.

2. The demolding device as described in claim 1, characterized in that, The locking baffle at the outer end of the lower connector and its configuration are the same as those of the locking baffle of the upper connector.

3. A demolding method for a demolding device, characterized in that, include: S1: Before demolding, open the locking baffle on the upper connecting seat and the locking baffle on the lower connecting seat, place the connector in the slots in the upper and lower connecting seats, and close the locking baffle; S2: After the white mold is formed, the upper mold is demolded and lifted upward by a press to separate it from the white mold; S3: The upper mold continues to move upward, and the connecting parts move upward synchronously under the drive of the upper mold; S4: During the upward process, the connecting rod makes contact with the lower connecting seat, thereby driving the demolding template to move upward synchronously, so that the white mold can be completely separated from the lower mold and the white mold can be ejected and demolded. S5: Remove the white mold using a robotic arm or manually; S6: After taking the mold, close the mold.

4. The demolding method of the demolding device as described in claim 3, characterized in that, In step S3, the upper stop at the top of the connector supports the first and second arms of the first connecting seat, and the upper mold drives the connector to move upward synchronously through the first connecting seat; in step S4, the lower stop at the bottom of the connector contacts and supports the third and fourth arms of the second connecting seat. At this time, the connector will drive the demolding template to move upward synchronously. The demolding template moves upward as a whole, which drives the ejector rod inside the lower mold core to move upward together, thereby ejecting the white mold and completing the demolding of the lower mold.

Images