A mold and method for making a starting block

Abstract

This invention relates to the field of starting pad molding technology, specifically a mold and method for manufacturing starting pads. The mold includes a base with a molding area and a demolding area distributed thereon; a mold body detachably connected to the molding area, including a plurality of molding cavities arranged in a first array; and a demolding assembly including a plurality of demolding protrusions disposed on the demolding area and adapted to the molding cavities, the demolding protrusions being arranged in a second array, the second array including the first array. This invention integrates casting and demolding functions into one unit, simultaneously setting the molding area and demolding area on the base. After molding, the mold body can be quickly removed and transferred to the demolding area for demolding. The structure is relatively compact. Furthermore, the arrangement of the demolding protrusions and positioning holes allows the device to be used with mold bodies having different numbers of molding cavities, as well as with multiple mold bodies used simultaneously, improving the device's applicability.

Description

Technical Field

[0001] This invention relates to the field of starting pad forming technology, and in particular to a mold and method for manufacturing starting pads. Background Technology

[0002] In the manufacturing process of resin busbars, to ensure the insulation distance between the start of the busbar and the base, an insulating pad of a certain height is usually added below the start. Currently, busbar start pads are mostly made using open-plate molds, split-type molding dies, or traditional casting molds.

[0003] Open-type flat molds typically involve first pouring epoxy resin, then manually sawing it into individual gaskets after curing. The resulting molded parts have poor dimensional accuracy, low surface flatness, and require secondary milling, leading to significant material waste and high labor time.

[0004] Split molds typically use upper and lower pressure plates and positioning pins to press multiple pads at once, but they lack draft angles and require hammering to demold, making the demolding process of the molded parts more difficult and easily damaging the products.

[0005] Traditional casting molds usually need to be used in conjunction with independent demolding fixtures. During the casting stage, the mold is fixed with screws, and after the liquid resin poured into the mold cavity has solidified, it is moved to a special demolding machine. The forming and demolding processes of this traditional building mold are scattered, requiring multiple clamping, occupying two pieces of equipment, and the space utilization rate is low.

[0006] The commonly used molding dies mentioned above share a common defect: the dies do not integrate casting and demolding functions, resulting in long process chains, cumbersome operation, and poor applicability. Therefore, improvements are needed. Summary of the Invention

[0007] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0008] To address the shortcomings of existing technologies, one objective of this invention is to provide a mold for manufacturing an initial pad block.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a mold for manufacturing a starting pad block, comprising a base on which a forming area and a demolding area are distributed; a mold body detachably connected to the forming area, comprising a plurality of forming cavities distributed in a first array; and a demolding assembly comprising a plurality of demolding protrusions disposed on the demolding area and adapted to the forming cavities, wherein the demolding protrusions are distributed in a second array, and the second array includes the first array.

[0010] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, the first array is composed of a×b molding cavities;

[0011] Where a is the number of forming cavities on the mold body along the first direction, b is the number of forming cavities on the mold body along the second direction, and both a and b are positive integers ≥ 1.

[0012] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, the second array is composed of c×d demolding protrusions;

[0013] Where c is the number of demolding bumps in the demolding area along the first direction, d is the number of demolding bumps in the demolding area along the second direction, and c×d is a positive integer greater than a×b.

[0014] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, when a>1, the center distance between two adjacent molding cavities in the first direction is P1, and when b>1, the center distance between two adjacent molding cavities in the second direction is P2.

[0015] The center distance between two adjacent demolding protrusions in the first direction is P3 = P1, and the center distance between two adjacent demolding protrusions in the second direction is P4 = P2.

[0016] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, the demolding assembly further includes a plurality of limiting protrusions, which are disposed on the base in a first direction and a second direction outside the demolding area;

[0017] The number of limiting protrusions along the second horizontal axis is equal to the number of c in the second array.

[0018] The center-to-center distance between two adjacent limiting protrusions in the first direction is equal to P3, the number of limiting protrusions along the second direction is equal to d in the second array, and the center-to-center distance between two adjacent limiting protrusions in the second direction is equal to P4.

[0019] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, the demolding assembly further includes a first limiting member and a second limiting member, wherein the first limiting member is disposed in a second direction of the demolding area, and the second limiting member is disposed in a first direction of the demolding area.

[0020] The first limiting member and the second limiting member are both provided with limiting openings, which are used to engage with the demolding protrusion or the limiting protrusion. The first limiting member abuts against the side edge of the mold body located in the second direction, and the second limiting member abuts against the side edge of the mold body located in the first direction.

[0021] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, the demolding assembly further includes a first sliding groove, a second sliding groove, and a sliding member. The first sliding groove is disposed on the first limiting member, the second sliding groove is disposed on the second limiting member, and the sliding member is slidably connected to the first limiting member and the second limiting member.

[0022] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, wherein: a demolding angle α is formed between the side surface and the bottom surface of the molding cavity, and 90.5°≤α≤91.5°.

[0023] As a preferred embodiment of the mold for manufacturing the starting pad block of the present invention, the mold body further includes a connecting hole located on the same reference plane as the molding cavity, and the base further includes a positioning hole that cooperates with the connecting hole. The connecting hole and the positioning hole are connected by a fastener.

[0024] The number of positioning holes is equal to the number of demolding protrusions. The center distance between two adjacent positioning holes in the first direction is equal to P1, and the center distance between two adjacent positioning holes in the second direction is equal to P2.

[0025] The beneficial effects of the mold for manufacturing the starting pad block according to the present invention are as follows:

[0026] 1. This invention integrates casting and demolding functions into one unit, and sets the molding area and demolding area on the base at the same time. After molding, the mold body can be quickly removed and transferred to the demolding area for demolding. The structure is relatively compact. At the same time, through the setting of several demolding protrusions and positioning holes, the device can be used for mold bodies with different numbers of molding cavities, and can also be used for multiple mold bodies at the same time, which improves the applicability of the device.

[0027] 2. This invention utilizes the first and second limiting components to assist in positioning during the demolding process of the mold body, thereby enabling more precise and rapid docking with the demolding protrusion to complete the demolding process. Simultaneously, by setting the demolding angle α, when the mold body cooperates with the demolding protrusion for demolding, the demolding angle α of the molding cavity keeps the outer wall of the molded part tending to separate from the cavity wall, reducing demolding resistance and making demolding smoother.

[0028] To address the shortcomings of the prior art, another objective of this invention is to provide a method for manufacturing a starting pad.

[0029] To achieve the above objectives, the present invention adopts the following technical solution: a method for manufacturing a starting end pad, using the aforementioned mold for manufacturing the starting end pad, comprising the following steps:

[0030] Place the mold body above the forming area of ​​the base, align the connecting holes on the mold body with the positioning holes on the base, insert the fixing parts to complete the positioning, and at this time a mold cavity with an opening at the top is formed between the forming cavity and the base.

[0031] Liquid resin is injected into the mold cavity, and the upper surface of the liquid resin is made flush with the upper end face of the mold body. Then it is left to solidify at room temperature. After the liquid resin has completely hardened to form the starting pad, the fixing parts are removed and the mold body is lifted off the base.

[0032] By aligning the limiting port on the first limiting member with the demolding protrusion or the limiting protrusion, pressing down on the first limiting member to make it adhere to the base, sliding the second limiting member and adjusting its position in the first slide groove, and after the limiting port on the second limiting member is aligned with the demolding protrusion or the limiting protrusion, pressing down on the second limiting member to make it adhere to the base, so that a demolding protrusion with the same number and arrangement position as the molding cavity is left between the first limiting member and the second limiting member;

[0033] Align the two orthogonally adjacent side edges of the mold body with the first and second limiting members respectively, so that the molding cavity on the mold body is aligned with the demolding protrusion. Press down on the mold body to make the demolding protrusion enter the molding cavity and push out the solidified starting pad as a whole, thus completing the demolding.

[0034] The beneficial effects of the method for manufacturing a starting pad block according to the present invention are the same as those of the mold for manufacturing a starting pad block, and will not be repeated here. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments 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.

[0036] Figure 1 This is a schematic diagram of the structure of the mold, base, and demolding protrusion of the present invention.

[0037] Figure 2 This is a schematic diagram of the molding area and the demolding area of ​​the present invention.

[0038] Figure 3 This is a schematic diagram of the first array and the second array of the present invention.

[0039] Figure 4 This is a schematic diagram of the molding cavity and demolding protrusion of the present invention in the first and second directions.

[0040] Figure 5 This is a schematic diagram of the demolding area and the limiting protrusion of the present invention.

[0041] Figure 6 This is a schematic diagram of the structure of the first limiting member, the sliding member, and the second limiting member of the present invention.

[0042] Figure 7 This is an exploded cross-sectional view of the first limiting member, the sliding member, and the second limiting member of the present invention.

[0043] Figure 8 This is a schematic diagram of the demolding angle of the present invention.

[0044] Figure 9 This is a schematic diagram of the overall structure of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0046] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0047] Reference Figures 1-4 This embodiment provides a mold for manufacturing a starting pad block, including a base 100 on which a molding area S1 and a demolding area S2 are distributed, a mold body 200 which is detachably connected to the molding area S1 and includes a plurality of molding cavities 201 distributed in a first array, and a demolding assembly 300 which includes a plurality of demolding protrusions 301 disposed on the demolding area S2 and adapted to the molding cavities 201. The demolding protrusions 301 are distributed in a second array, and the second array includes the first array.

[0048] The demolding protrusion 301 is connected to the base 100. The molding cavity 201 is opened on the mold body 200. The molding area S1 and the demolding area S2 are located in the same plane. The molding area S1 is located on one side of the base 100, and the demolding area S2 is located on the other side of the base 100. The demolding protrusion 301 and the molding cavity 201 are complementary, that is, the molding cavity 201 can allow the demolding protrusion 301 to fully enter.

[0049] Furthermore, the first array consists of a×b molding cavities 201, where a is the number of molding cavities 201 on the mold body 200 along the first direction X, and b is the number of molding cavities 201 on the mold body 200 along the second direction Y, and both a and b are positive integers ≥1.

[0050] Furthermore, the second array is composed of c×d demolding bumps 301, where c is the number of demolding bumps 301 in the demolding area S2 along the first direction X, d is the number of demolding bumps 301 in the demolding area S2 along the second direction Y, and c×d is a positive integer greater than a×b.

[0051] Furthermore, when a>1, the center distance between two adjacent molding cavities 201 in the first direction X is P1; when b>1, the center distance between two adjacent molding cavities 201 in the second direction Y is P2; the center distance between two adjacent demolding protrusions 301 in the first direction X is P3=P1; and the center distance between two adjacent demolding protrusions 301 in the second direction Y is P4=P2.

[0052] Preferably, the mold body 200 can also be configured as a single molding cavity 201, that is, when a and b = 1, the first array or the second array degenerates into a single column or a single row arrangement. At this time, the molding cavity 201 does not have P1 and P2 in the mold body 200.

[0053] Preferably, when a=1, the first array degenerates into a single column or single row arrangement. At this time, the molding cavity 201 does not have P1 in the mold body 200.

[0054] Preferably, when b=1, the second array degenerates into a single column or single row arrangement, and the molding cavity 201 does not have P2 in the mold body 200.

[0055] The maximum number of forming cavities 201 in the mold body 200 is equal to the total number of demolding protrusions 301;

[0056] By setting a number of demolding protrusions 301, the device can be used to demold mold bodies 200 with different numbers of forming cavities 201 in the first direction X or the second direction Y.

[0057] By setting P3=P1 and P4=P2, the molding cavity 201 on the mold body 200 can be successfully aligned with the demolding protrusion 301.

[0058] The method of setting a number of demolding protrusions 301 can not only be applied to mold bodies 200 with different numbers of forming cavities 201, but also to demolding multiple mold bodies 200 at the same time.

[0059] Reference Figures 5-9 This embodiment provides a mold for manufacturing a starting pad block, including a demolding component 300 and a plurality of limiting protrusions 302. The limiting protrusions 302 are disposed on the base 100 in the first direction X and the second direction Y around the demolding area S2.

[0060] Among them, the number of limiting protrusions 302 along the second horizontal axis is equal to the number of c in the second array, the center distance between two adjacent limiting protrusions 302 in the first direction X is equal to P3, the number of limiting protrusions 302 along the second direction Y is equal to the number of d in the second array, and the center distance between two adjacent limiting protrusions 302 in the second direction Y is equal to P4.

[0061] Among them, the center distance between the limiting protrusion 302 and the adjacent demolding protrusion 301 in the first direction X is equal to P3, and the center distance between the limiting protrusion 302 and the adjacent demolding protrusion 301 in the second direction Y is equal to P4.

[0062] Furthermore, the demolding assembly 300 also includes a first limiting member 303 and a second limiting member 304. The first limiting member 303 is located in the second direction Y of the demolding area S2, and the second limiting member 304 is located in the first direction X of the demolding area S2.

[0063] The first limiting member 303 and the second limiting member 304 are both provided with limiting ports 305, which are used to engage with the demolding protrusion 301 or the limiting protrusion 302.

[0064] The limiting protrusions 302 are provided in the first direction X and the second direction Y so that when the number of forming cavities 201 of the mold body 200 is maximized (i.e., when a×b=c×d), the first limiting member 303 and the second limiting member 304 can still provide auxiliary positioning for the side edges of the mold body 200 in the first direction X and the second direction Y.

[0065] The number of limiting ports 305 on the first limiting member 303 is d+1 (1 is the number of upper limiting protrusions 302 in the second direction Y), and the number of upper limiting ports 305 on the second limiting member 304 is set to a single one, so that when the number of forming cavities 201 on the mold body 200 is minimized (i.e. when a, b=1), it can still be used for auxiliary positioning.

[0066] Furthermore, the demolding assembly 300 also includes a first slide 306, a second slide 307, and a sliding member 308. The first slide 306 is disposed on the first limiting member 303, the second slide 307 is disposed on the second limiting member 304, and the sliding member 308 is slidably connected to the first limiting member 303 and the second limiting member 304.

[0067] The first groove 306 is formed on one side of the first limiting member 303, and its length along the second direction Y is sufficient to allow the first limiting member 303 and the sliding member 308 to move onto the limiting protrusion 302 located in the first direction X.

[0068] The second slide groove 307 is opened on one side of the second limiting member 304 and is opposite to the first slide groove 306. The second slide groove 307 is used to provide space for the sliding member 308 to move up and down. When the sliding member 308 is at the highest position of the second slide groove 307, the second limiting member 304 can be pressed against the upper surface of the base 100, so that the demolding protrusion 301 or the limiting protrusion 302 is completely fitted into the molding cavity 201.

[0069] When the slider 308 is at the lowest position of the second groove 307, the bottom surface of the second limiting member 304 is flush with the top surface of the limiting protrusion 302 and the demolding protrusion 301, so it can be adjusted without the restriction of the limiting protrusion 302 and the demolding protrusion 301.

[0070] Furthermore, the first limiting member 303 abuts against the side edge of the mold body 200 located in the second direction Y, and the second limiting member 304 abuts against the side edge of the mold body 200 located in the first direction X.

[0071] The first limiting member 303 and the second limiting member 304 can limit the mold body 200 in the first direction X and the second axis direction respectively during the demolding process, so that the molding cavity 201 of the mold body 200 can be more accurately and quickly connected with the demolding protrusion 301 to perform the demolding process.

[0072] Reference Figure 8 This embodiment provides a mold for manufacturing a starting pad block, including a demolding angle α formed between the side and bottom surfaces of the molding cavity 201, where 90.5°≤α≤91.5°.

[0073] In this way, by setting the demolding angle α, when the mold body 200 cooperates with the demolding protrusion 301 for demolding, the demolding angle α of the molding cavity 201 makes the outer wall of the molded part tend to separate from the cavity wall, reducing the demolding resistance, and making the demolding of the starting pad block after it is fully formed in the molding cavity 201 smoother.

[0074] Reference Figure 9 This embodiment provides a mold for making a starting pad block, including a mold body 200 and a connecting hole 202 located on the same reference plane as the forming cavity 201. The base 100 also includes a positioning hole 101 that is connected to the connecting hole 202. The connecting hole 202 and the positioning hole 101 are connected by a fastener.

[0075] The number of positioning holes 101 is equal to the number of demolding protrusions 301. The center distance between two adjacent positioning holes 101 in the first direction X is equal to P1, and the center distance between two adjacent positioning holes 101 in the second direction Y is equal to P2.

[0076] The configuration of a number of positioning holes 101 allows it to be used not only for mold bodies 200 with different numbers of forming cavities 201, but also for forming processes on multiple mold bodies 200 at the same time.

[0077] This embodiment provides a method for manufacturing a starting end pad, including a mold for manufacturing the starting end pad, and includes the following steps:

[0078] Place the mold body 200 above the forming area S1 of the base 100, align the connecting hole 202 on the mold body 200 with the positioning hole 101 on the base 100, insert the fixing piece to complete the positioning, and at this time a mold cavity with an upper opening is formed between the forming cavity 201 and the base 100.

[0079] Inject liquid resin into the mold cavity and make the upper surface of the liquid resin flush with the upper end face of the mold body 200. Then let it stand and cure at room temperature. After the liquid resin has completely hardened to form the starting pad, remove the fixing parts and lift the mold body 200 upwards from the base 100.

[0080] By aligning the limiting opening 305 on the first limiting member 303 with the demolding protrusion 301 or the limiting protrusion 302, pressing down on the first limiting member 303 to make it adhere to the base 100, sliding the second limiting member 304, adjusting its position in the first slide groove 306, and after the limiting opening 305 on the second limiting member 304 is aligned with the demolding protrusion 301 or the limiting protrusion 302, pressing down on the second limiting member 304 to make it adhere to the base 100, so that the number and arrangement of demolding protrusions 301 are the same as those of the molding cavity 201 between the first limiting member 303 and the second limiting member 304;

[0081] Align the two orthogonally adjacent side edges of the mold body 200 with the first limiting member 303 and the second limiting member 304 respectively, so that the molding cavity 201 on the mold body 200 is aligned with the demolding protrusion 301 one by one. Press down on the mold body 200 so that the demolding protrusion 301 enters the molding cavity 201 and pushes out the solidified starting pad as a whole, thus completing the demolding.

[0082] Preferred, such as Figure 9 As shown, the first array (i.e. the arrangement and number of forming cavities 201 on the mold body 200) is 3×3, while the second array (i.e. the arrangement and number of demolding protrusions 301 in the demolding area S2) is 4×8. Therefore, the second array completely includes the first array, so that the mold body 200 can perform the demolding process at any position in the demolding area S2 that matches the first array.

[0083] When the second array can simultaneously contain two first arrays, the two mold bodies 200 can be demolded at once in the demolding zone S2 in conjunction with the first limiting member 303 and the second limiting member 304.

[0084] There is no specific limit to the number of the first array and the second array.

[0085] Preferably, the first array can be as small as 1×1. When the first array is 1×1, it can be placed in any position in the second array that matches the first array for the demolding process.

[0086] Preferably, the first array is equal to the second array, so that when the demolding process is performed, the first array will completely overlap with the second array. At this time, the first limiting member 303 and the second limiting member 304 will assist in positioning the mold body 200 on the limiting protrusion 302 located on the periphery of the demolding area S2.

[0087] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A mold for making a starting pad, characterized by: include, The base (100) has a molding area (S1) and a demolding area (S2) distributed on it. The mold body (200) is detachably connected to the molding area (S1) and includes a plurality of molding cavities (201) arranged in a first array. The demolding assembly (300) includes a plurality of demolding protrusions (301) disposed on the demolding area (S2) and adapted to the molding cavity (201), the demolding protrusions (301) being distributed in a second array, and the second array comprising the first array; The demolding assembly (300) further includes a first limiting member (303) and a second limiting member (304); The first limiting member (303) is located in the second direction (Y) of the demolding area (S2); The second limiting member (304) is disposed in the first direction (X) of the demolding area (S2); The first limiting member (303) and the second limiting member (304) are provided with limiting openings (305), which are used to engage with the demolding protrusion (301) or the limiting protrusion (302). The first limiting member (303) abuts against the side edge of the mold body (200) in the second direction (Y), and the second limiting member (304) abuts against the side edge of the mold body (200) in the first direction (X). The demolding assembly (300) further includes a first slide (306), a second slide (307), and a slider (308); The first slide groove (306) is disposed on the first limiting member (303); The second slide (307) is provided on the second limiting member (304); The sliding member (308) is slidably connected to the first limiting member (303) and the second limiting member (304).

2. The mold for making a start pad as defined in claim 1, wherein: The first array consists of a×b forming cavities (201); Where a is the number of forming cavities (201) on the mold body (200) along the first direction (X), b is the number of forming cavities (201) on the mold body (200) along the second direction (Y), and a and b are both positive integers ≥1.

3. The mold for making a start pad as defined in claim 2, wherein: The second array consists of c×d demolding bumps (301); Where c is the number of demolding bumps (301) in the demolding area (S2) along the first direction (X), d is the number of demolding bumps (301) in the demolding area (S2) along the second direction (Y), and c×d is a positive integer greater than a×b.

4. The mold for making a starting pad as set forth in claim 2 or 3, wherein: When a>1, the center distance between two adjacent molding cavities (201) in the first direction (X) is P1; when b>1, the center distance between two adjacent molding cavities (201) in the second direction (Y) is P2. The center distance between two adjacent demolding protrusions (301) in the first direction (X) is P3=P1, and the center distance between two adjacent demolding protrusions (301) in the second direction (Y) is P4=P2.

5. The mold for making a starting pad as defined in claim 2 or 3, wherein: The demolding assembly (300) further includes a plurality of limiting protrusions (302), which are disposed on the base (100) in a first direction (X) and a second direction (Y) around the demolding area (S2). The number of limiting protrusions (302) along the second horizontal axis is equal to the number of c in the second array. The center-to-center distance between two adjacent limiting protrusions (302) in the first direction (X) is equal to that of P3. The number of limiting protrusions (302) along the second direction (Y) is equal to that of d in the second array. The center-to-center distance between two adjacent limiting protrusions (302) in the second direction (Y) is equal to that of P4.

6. The mold for manufacturing the starting end pad as claimed in any one of claims 1 to 3, wherein: The side and bottom surfaces of the molding cavity (201) form a demolding angle α, and 90.5°≤α≤91.5°.

7. The mold for making a start pad as defined in claim 6 wherein: The mold body (200) also includes a connecting hole (202) located on the same reference plane as the molding cavity (201), and the base (100) also includes a positioning hole (101) that is connected to the connecting hole (202). The connecting hole (202) and the positioning hole (101) are connected by a fastener. The number of positioning holes (101) is equal to the number of demolding protrusions (301), the center distance between two adjacent positioning holes (101) in the first direction (X) is equal to P1, and the center distance between two adjacent positioning holes (101) in the second direction (Y) is equal to P2.

8. A method of making a starting pad, characterized by: The mold used for manufacturing the starting pad block according to any one of claims 1 to 3 and 6 further includes the following steps: Place the mold body (200) above the forming area (S1) of the base (100), align the connecting hole (202) on the mold body (200) with the positioning hole (101) on the base (100), insert the fixing piece to complete the positioning, and at this time a mold cavity with an upper opening is formed between the forming cavity (201) and the base (100). Liquid resin is injected into the mold cavity and the upper surface of the liquid resin is flush with the upper end face of the mold body (200). Then, it is left to solidify at room temperature. After the liquid resin has completely hardened to form the starting pad, the fixing parts are removed and the mold body (200) is lifted off the base (100). By aligning the limiting port (305) on the first limiting member (303) with the demolding protrusion (301) or the limiting protrusion (302), pressing down on the first limiting member (303) to make it adhere to the base (100), sliding the second limiting member (304) and adjusting its position in the first slide groove (306), after the limiting port (305) on the second limiting member (304) is aligned with the demolding protrusion (301) or the limiting protrusion (302), pressing down on the second limiting member (304) to make it adhere to the base (100), so that the number and arrangement of demolding protrusions (301) are the same as those of the molding cavity (201) between the first limiting member (303) and the second limiting member (304). Align the two orthogonally adjacent side edges of the mold body (200) with the first limiting member (303) and the second limiting member (304) respectively, so that the molding cavity (201) on the mold body (200) is aligned with the demolding protrusion (301) one by one. Press down on the mold body (200) so that the demolding protrusion (301) enters the molding cavity (201) and pushes out the solidified starting pad as a whole, thus completing the demolding.

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