A manufacturing method based on a flip cover forming die

Abstract

The present application relates to injection mold technical field, especially to a kind of preparation method based on flip forming mold, comprising the following steps: liquid needle is placed into female die and fixed, after injection melt glue cooling forming, move on fixed plate, second spring drives inner needle to retreat from sealing needle position, female die plate drives female die to move up, buckle position needle leaves upper cover, reverse jack cylinder is pressed under the action of third spring upper cover, female die plate continues to move up, reverse jack cylinder leaves, first spring drives sliding block to open horizontally and let in, lower silk cylinder ejects product, when mould closes, female die plate presses down sliding block reset.The present application uses spring type sliding block to replace traditional push plate and inclined block mechanism, simplifies mold structure, reduces manufacturing and maintenance cost, simultaneously through the collaborative design of inner needle first let in and reverse jack cylinder continuous pressing, effectively prevent buckle position to pull over and product damage, improve demoulding reliability and product quality.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to a method for preparing a flip-top molding mold. Background Technology

[0002] Currently, this type of flip-top molding die typically requires an additional push plate in the rear mold section for demolding, along with a slanted block mechanism. During product ejection, the slanted block on the push plate drives the slider to move outwards at an angle, thus preventing the slider from being pulled up by the lower cover, preventing damage to the lower cover's surface, and also preventing the upper cover from being pulled up or broken at the hinge. However, this conventional mold structure is complex, requiring the addition of push plates and slanted blocks in the rear mold, leading to an increased overall mold volume and higher manufacturing and maintenance costs. Therefore, existing flip-top molding dies suffer from structural complexity, large size, and high maintenance costs. There is an urgent need for a flip-top molding die manufacturing method that simplifies the structure, provides a more stable and reliable demolding process, and effectively protects the product's critical structures. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention proposes a preparation method based on a flip-top forming mold, which solves the above technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing a flip-top molding die, comprising the following steps: The first step is to insert the liquid dispensing needle into the mold core, and then connect the adjusting screw through the mold core to the mold plate to fix the mold core. The second step is to inject molten glue between the male mold core and the female mold core. After cooling and solidification, the upper fixing plate moves upward. Under the action of the second spring, the top of the second spring presses against the outer ring position of the inner needle, and the inner needle will move upward. The bottom of the inner needle will leave the sealing needle position. The third step involves moving the female mold plate upwards a certain distance after completion. This movement causes the female mold core to move upwards, with a certain gap between the bottom surface of the female mold core and the male mold core. This gap is the distance the moving block moves longitudinally. As the female mold plate moves upwards, the lower mounting block will synchronously move the locking pin upwards. The bottom of the locking pin will move away from the position between the sealing pin and the tube ring on the upper cover. The moving block moves downwards under the action of the third spring, and the reverse ejector screw cylinder inside the moving block will synchronously follow the moving block downwards. The bottom of the reverse ejector screw cylinder will continuously press against the upper cover. In the fourth step, the female mold plate will continue to move upward. At this time, since the bottom surface of the moving block is in contact with the female mold plate, the female mold plate moves upward and will simultaneously drive the reverse ejector screw cylinder inside the moving block to leave the position of the upper cover. The distance between the female mold core, inner pin and locking pin and the male mold core below will continue to increase. Under the action of the first spring, the slider will move laterally. When the upper cover flips up, the slider will instantly spring open to make room, and then the lower screw cylinder will push out the product. Fifth step: After completion, the mother mold plate moves downward to close the mold, and the guide slope of the slider will move back to its original position under the pressure of the mother mold core.

[0005] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: This method for preparing a flip-top molding die eliminates the need for additional push plates and inclined blocks required in traditional molds by using a spring-loaded slider. This significantly simplifies the overall mold structure, reduces the mold volume, and lowers the manufacturing and maintenance costs. At the same time, it avoids the risk of damage to the upper and lower covers and breakage at the butterfly joint during product ejection, thereby improving product molding quality and production efficiency.

[0006] Furthermore, the present invention allows the inner needle to retract and make room under the action of the second spring, providing deformation space for the demolding of the upper cover sealing needle, effectively preventing the snap-fit ​​from being pulled over, and ensuring the sealing performance and opening force of the product. At the same time, the reverse ejector cylinder always presses against the upper cover before the mother mold completely detaches from the upper cover, ensuring the stability and reliability of the upper cover demolding process.

[0007] Furthermore, by setting the liquid outlet needle as a detachable separate structure of the locking needle and the liquid outlet insert, and in conjunction with the design of a large screw hole on the female mold core, this invention allows for the replacement of only the liquid outlet insert when different liquid outlet diameters need to be changed, without disassembling the entire mold. This simplifies and speeds up the replacement process, significantly shortens the replacement cycle, and improves production efficiency. At the same time, since there is no sealing or opening force relationship between the liquid outlet insert and the top cover, multiple rounds of sealing and opening force tests and adjustments are not required after replacement, reducing trial molding costs.

[0008] Furthermore, by setting a detachable insert block inside the mother mold core and placing it at the position of the 7-shaped interlocking surface, the present invention facilitates the replacement of the insert block and the adjustment of the mold, thereby further improving the maintenance convenience and molding accuracy of the mold.

[0009] Furthermore, by setting a groove with an inclination angle of 50 to 80 degrees on the slider and rounding the edges of the inclination groove on both sides, the present invention effectively avoids the problem of the top cover getting stuck on the slider or damaging the top cover or breaking the bow during the flipping process, thus ensuring smooth demolding and product appearance quality. Attached Figure Description

[0010] Figure 1 This is a front view structural diagram of the mold of the present invention.

[0011] Figure 2 This is a schematic diagram of the internal structure of the mold of the present invention.

[0012] Figure 3 This is the present invention. Figure 2 A magnified structural diagram at point A in the diagram.

[0013] Figure 4 This is a schematic cross-sectional view of the mold structure of the present invention.

[0014] Figure 5 This is the present invention. Figure 4 A magnified structural diagram at point B in the diagram.

[0015] Figure 6 This is a schematic diagram of the exploded structure of the locking pin and the liquid outlet insert pin of the present invention.

[0016] Figure 7 This is a schematic diagram of the slider structure of the present invention.

[0017] Figure 8 This is a schematic diagram of the mold working process structure of the present invention.

[0018] Figure 9 This is a schematic diagram of a partial structure of the mold of the present invention.

[0019] Figure 10 This is a schematic diagram of a partial cross-sectional structure of the mold of the present invention.

[0020] Figure 11 This is a cross-sectional schematic diagram of the flip-top structure of the present invention.

[0021] Figure 12 This is a cross-sectional schematic diagram of the flip-top snap-fit ​​structure of the present invention.

[0022] Figure 13 This is a schematic diagram of the flip-top structure of the present invention.

[0023] Figure 14 This is a schematic cross-sectional view of a portion of the flip-top structure of the present invention.

[0024] Figure 15 This is a top view schematic diagram of the bow structure of the present invention.

[0025] Figure 16 This is a partially enlarged structural diagram of the top of the bow knot of the present invention.

[0026] Figure 17 This is a partially enlarged structural diagram of the bottom of the bow knot of the present invention.

[0027] Figure 18 This is a schematic diagram of the third spring in use according to the present invention.

[0028] The diagram is labeled as follows: 1. Upper fixing plate; 2. Upper plate; 3. Female mold plate; 4. Female mold core; 5. Male mold core; 6. Male mold plate; 7. Lower screw spool; 8. Mold foot; 9. Lower fixing plate; 10. Liquid outlet needle; 11. Adjusting screw; 12. Slider; 12a. Guide slope; 12b. Inclined groove; 12c. Rounded corner; 13. First spring; 15. Insert block; 10a. Locking pin; 10b. Liquid outlet insert pin; 3a. Large screw hole; 141. Upper mounting block; 142. Lower mounting block; 143. Reverse ejector screw spool; 144. Locking pin; 145. Inner pin; 146. Outer ring; 147. Second spring. Detailed Implementation

[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] refer to Figures 1 to 18 This embodiment provides a method for preparing a flip-top molding die, comprising the following steps: The first step is to insert the liquid dispensing needle 10 into the female mold core 4, and then pass the adjusting screw 11 through the female mold core 4 and connect it to the female template 3, thereby completing the fixation of the female mold core 4. The second step is to inject molten glue between the male mold core 5 and the female mold core 4. After cooling and molding, the upper fixing plate 1 moves upward. Under the action of the second spring 147, the top of the second spring 147 presses the outer ring 146 of the inner needle 145, and the inner needle 145 will move upward. The bottom of the inner needle 145 will leave the sealing needle position. The third step involves moving the female mold plate 3 upward a certain distance after completion. The female mold plate 3 then moves the female mold core 4 upward. There is a certain gap between the bottom surface of the female mold core 4 and the male mold core 5. This gap is the distance that the moving block moves longitudinally. When the female mold plate 3 moves upward, the lower mounting block 142 will synchronously move the locking pin 144 upward. The bottom of the locking pin 144 will leave the position between the sealing pin and the tube ring on the upper cover. The moving block moves downward under the action of the third spring 14a. The reverse ejector screw cylinder 143 inside the moving block will synchronously follow the moving block downward. The bottom of the reverse ejector screw cylinder 143 will continuously press against the upper cover. In the fourth step, the female mold plate 3 will continue to move upward. At this time, since the bottom surface of the moving block is in contact with the female mold plate 3, the female mold plate 3 moves upward, which will simultaneously drive the anti-ejector screw cylinder 143 in the moving block to leave the upper cover position. The distance between the female mold core 4, the inner pin 145 and the snap-fit ​​pin 144 and the lower male mold core 5 continues to increase. Under the action of the first spring 13, the slider 12 will move laterally. When the upper cover flips up, the slider 12 will instantly spring open to make room, and then the lower screw cylinder 7 will push out the product. Fifth step, after completion, the mother mold plate 3 moves downward to close the mold, and the guide slope 12a of the slider 12 will move back to the original position under the pressure of the mother mold core 4.

[0031] The slider 12 is spring-loaded. Under the action of the first spring 13, the slider 12 generates an outward force. At the moment the lower screw spool 7 pushes the product, the upper cover will have an upward flipping force under the action of the back of the upper cover 201 and the arc surface of the 7-shaped structure. The butterfly 7-shaped structure is the product connecting strip 400 position. When the upper cover flips upward, the slider 12 instantly springs open to make room. The product continues to be pushed upward under the action of the lower screw spool 7. The mold structure of this application is simpler than the existing conventional mold mechanism. Currently, the existing conventional mold requires an additional push plate. While the product is pushed upward, the slider 12 needs to move diagonally downward and outward on the push plate under the action of the inclined push block. This is to avoid damage to the cover and breakage at the 7-shaped and butterfly joints. The existing conventional mold mechanism is complex and the mold volume is large. The mold of this application eliminates the push plate structure and the slider 12 is spring-loaded, which can save mold space, simplify the mold structure, and reduce mold manufacturing and maintenance costs.

[0032] In order to ensure that the sealing pin of the upper cover can be demolded smoothly, before the snap pin 144 is forcibly demolded, the inner pin 145 first moves backward under the action of the second spring 147 to make room for deformation, so that the snap pin is not easily pulled over, ensuring sealing and opening force. Before the upper cover is demolded, the reverse ejector screw cylinder 143 will keep pressing against the upper cover under the action of the second spring 147 until the front mold position of the mother mold 3 is completely separated from the upper cover. At this time, the reverse ejector screw cylinder 143 moves away from the upper cover together with the mother mold 3.

[0033] In the first step, the liquid outlet needle 10 includes a retaining pin 10a disposed within the female mold core 4, and a liquid outlet insert pin 10b detachably disposed within the retaining pin 10a. The bottom of the liquid outlet insert pin 10b has a protrusion protruding from the bottom surface of the retaining pin 10a. The female mold core 4 is provided with an adjusting screw 11 that is detachably connected to the female mold plate 3. The female mold core 4 has a large screw hole 3a located at the position of the adjusting screw 11 that does not contact the adjusting screw 11. When it is necessary to replace the liquid outlet needle 10, unscrew the adjusting screw 11, and then screw in the new M8 screw to engage with the large screw hole 3a of the female mold core 4. Screw in the external M8 screw to push the cavity of the female mold core 4 outward, separating the female mold core 4 from the female mold plate 3. Then remove the liquid outlet needle 10, pull the liquid outlet insert 10b out of the retaining pin 10a, and then install the new liquid outlet insert 10b into the retaining pin 10a. The diameter of the protrusion of the new liquid outlet insert 10b is different from the original. Put the retaining pin 10a into the female mold core 4, and then fix the female mold core 4 into the female mold plate 3 by adjusting the bolt.

[0034] Since the protrusion 10c of the outlet pin 10b determines the diameter of the outlet of the lower cover, when a different outlet diameter is required, only the outlet pin 10b needs to be replaced. The outlet pin 10b has no related sealing and opening force matching relationship with the glue position on the product and the upper cover, so there is no need to go through multiple rounds of sealing and opening force testing and adjustment. It can be used by simply replacing the outlet pin 10b. Therefore, this structure has low cost, short replacement cycle and high production efficiency.

[0035] In use, first pass the adjusting screw 11 through the large screw hole 3a of the female mold core 4 and make it contact with the female mold plate 3. At this time, since the adjusting screw 11 is an M6 screw and the large screw hole 3a on the female mold core 4 is an M8 thread, the adjusting screw 11 will not contact the large screw hole 3a of the female mold core 4. When it is necessary to remove the liquid outlet insert 10b, unscrew the adjusting screw 11 from the inside of the female mold core 4, and then engage the external M8 screw with the M8 thread in the large screw hole 3a on the female mold core 4. Screw in the external M8 screw to push the cavity of the female mold core 4 outward, and the female mold core 4 will separate from the female mold plate 3. The cavity can be easily removed to replace the liquid outlet insert 10b. When replacing the liquid outlet insert 10b, it is not necessary to remove the entire mold, which increases the replacement efficiency and production efficiency.

[0036] In the first step, the female mold core 4 is equipped with an insert block 15. The insert block 15 of the female mold core 4 is located on the 7-shaped interlocking surface and is connected by an insert. The insert block 15 is easy to replace and facilitates mold matching and adjustment.

[0037] The slider 12 has a groove 12d that mates with the inlay block 15. Inclined grooves 12b are provided on both sides of the groove, and rounded corners 12c are provided near the edges of the inclined grooves 12b. The groove 12d has a large inclination angle, and the angle between the groove 12d and the top surface of the slider 12 is 50-80 degrees. This avoids the risk of the flip cover getting stuck on the slider 12 and breaking the ribbon. The rounded corners 12c at the edges of the inclined grooves 12b on the slider 12 prevent the slider 12 from damaging the top cover during use.

[0038] For reference, the aforementioned flip-top mold, from top to bottom, specifically includes an upper fixing plate 1, an upper plate 2, a female template 3, a female mold core 4, a male mold core 5, a male template 6, a lower thread spool 7, a mold foot 8, and a lower fixing plate 9. The female mold core 4 is detachably equipped with a liquid outlet needle 10. The liquid outlet needle 10 includes a retaining pin 10a disposed within the female mold core 4 and a liquid outlet insert pin 10b detachably disposed within the retaining pin 10a. The bottom of the liquid outlet insert pin 10b has a protrusion 10c located at the liquid outlet of the lower cover, and the bottom of the protrusion 10c protrudes from the retaining pin 10a. On the bottom surface, this application divides the liquid outlet needle 10 into two parts: a locking needle 10a and a liquid outlet insert needle 10b. The female mold core 4 is provided with an adjusting screw 11 that is detachably connected to the female mold plate 3. The female mold core 4 has a large screw hole 3a located at the position of the adjusting screw 11, which does not contact the adjusting screw 11. The liquid outlet insert needle 10b is detachably installed inside the locking needle 10a. The adjusting screw 11 is preferably an M6 screw, and the large screw hole 3a on the female mold core 4 through which the adjusting screw 11 passes is an M8 thread. The male mold plate 6 is located at the male mold core 5 and has a connection with the butterfly joint and the top cover. A slider 12 is in contact with the male mold core 5, and a first spring 13 is provided between the slider 12 and the male mold core 5. A guide slope 12a is provided on one side of the slider 12. A reverse ejection mechanism is installed in the upper plate 2 and the female mold core 3. The reverse ejection mechanism includes an upper mounting block 141 in the upper plate 2, a lower mounting block 142 on the top of the female mold core 3, a moving block 140 slidably disposed in the female mold core 3, and a reverse ejection screw cylinder 143 slidably disposed in the moving block 140. The bottom of the reverse ejection screw cylinder 143 passes through the moving block 140 and the female mold core 3, and the bottom is flush with the upper cover. The tube ring and the sealing needle are in contact. A locking pin 144, slidably connected to the reverse screw cylinder 143, is detachably installed inside the lower mounting block 142. An inner pin 145, with its top end passing through the upper mounting block 141, slides inside the locking pin 144. The bottom of the locking pin 144 is located at the sealing needle of the upper cover. An outer ring 146, which fits against the inner wall of the top of the locking pin 144, is provided outside the inner pin 145. A second spring 147, used to push the inner pin 145 upward out of the upper mounting block 141, is provided between the outer ring 146 and the locking pin 144. (Reference) Figure 15 A third spring 14a is provided between the lower mounting block 142 and the moving block 140. The female mold core 4 is detachably connected to an inlay block 15 located at the 7-shaped position of the lower cover and the bow position. The inlay block 15 cooperates with the groove 12d. The inlay block 15 of the female mold core 4 is located at the 7-shaped interlocking surface and is connected by inlay.

[0039] For reference, the flip-top product manufactured by this preparation method includes a lower cover 101, a disassembly part 102 provided on the lower cover 101, a recessed part 103 provided in the middle of the lower cover 101, a liquid outlet 104 provided at the bottom of the recessed part 103, an upper cover 201 provided on one side of the lower cover 101 for engaging with the top surface of the lower cover 101, and a sealing pin 202 provided on the upper cover 201 for engaging with the recessed part 103. The inner wall of the recessed part 103 has a locking mechanism for engaging with the sealing pin 202. The locking mechanism includes a part provided in the recessed part 101. The inner ring retainer 105 extends from the inner wall of the 03 towards the sealing needle 202, and the outer ring retainer 203 is provided on the sealing needle 202 and spaced apart from the end face of the sealing needle 202. The bottom surface of the concave portion 103 is provided with a plane 2a, and the liquid outlet 104 is located at plane 2a. The lower cover 101 is provided with a tube positioning boss 106 on the top surface of the concave portion 103. The upper cover 201 is provided with a tube positioning ring 204 that contacts the tube positioning boss 106 on the top surface of the lower cover 101. A butterfly knot 300 is provided between the upper cover 201 and the lower cover 101. When the upper cover 201 and lower cover 101 are not fastened, the bow 300 has a first arc 301 near the lower cover 101, a second arc 302 near the upper cover 201, and a third arc 303 between the first and second arcs 301 and 302. The third arc 303 has a fold line 3d in the middle. When the upper cover 201 and lower cover 101 are fastened, the bow 300 will rotate and fold along the fold line 3d of the third arc 303. When the lower cover 101 is fastened, the second arc 302 of the upper cover 201 is positioned above the first arc 301 of the lower cover 101. A first protrusion 304 is provided at the connection between the back of the lower cover 101 and the bow 300. A second protrusion 305 is provided at the connection between the back of the upper cover 201 and the bow 300. The upper rounded corners of the first arc 301 and the first protrusion 304 of the bow 300 are similar to or consistent with those of the second arc 302 and the second protrusion 305. A connecting strap 400 is provided between the upper cover 201 and the lower cover 101.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method for preparing a flip-top molding die, characterized in that, Includes the following steps: The first step is to insert the liquid dispensing needle into the mold core, and then connect the adjusting screw through the mold core to the mold plate, thereby fixing the mold core. The second step is to inject molten glue between the male mold core and the female mold core. After cooling and solidification, the upper fixing plate moves upward. Under the action of the second spring, the top of the second spring presses against the outer ring position of the inner needle, and the inner needle will move upward. The bottom of the inner needle will leave the sealing needle position. The third step involves moving the female mold plate upwards a certain distance after completion. This movement causes the female mold core to move upwards, with a certain gap between the bottom surface of the female mold core and the male mold core. This gap is the distance the moving block moves longitudinally. As the female mold plate moves upwards, the lower mounting block will synchronously move the locking pin upwards. The bottom of the locking pin will move away from the position between the sealing pin and the tube ring on the upper cover. The moving block moves downwards under the action of the third spring, and the reverse ejector screw cylinder inside the moving block will synchronously follow the moving block downwards. The bottom of the reverse ejector screw cylinder will continuously press against the upper cover. In the fourth step, the female mold plate will continue to move upward. At this time, since the bottom surface of the moving block is in contact with the female mold plate, the female mold plate moves upward and will simultaneously drive the reverse ejector screw cylinder inside the moving block to leave the position of the upper cover. The distance between the female mold core, inner pin and locking pin and the male mold core below will continue to increase. Under the action of the first spring, the slider will move laterally. When the upper cover flips up, the slider will instantly spring open to make room, and then the lower screw cylinder will push out the product. Fifth step: After completion, the mother mold plate moves downward to close the mold, and the guide slope of the slider will move back to its original position under the pressure of the mother mold core.

2. The method for preparing a flip-top molding die according to claim 1, characterized in that: In the first step, the liquid outlet needle includes a retaining pin disposed in the female mold core and a liquid outlet insert pin disposed in the retaining pin. The bottom of the liquid outlet insert pin is provided with a protrusion protruding from the bottom surface of the retaining pin. The female mold core is provided with an adjusting screw that is detachably connected to the female mold plate. The female mold core is provided with a large screw hole at the position of the adjusting screw that does not contact the adjusting screw. When the liquid outlet needle needs to be replaced, unscrew the adjusting screw, then screw in the new M8 screw to mate with the large screw hole of the female mold core. Screw in the external M8 screw to push the cavity of the female mold core outward, separating the female mold core from the female mold plate. Then remove the liquid outlet needle, pull the liquid outlet insert from the retaining pin, and then install the new liquid outlet insert into the retaining pin. Put the retaining pin into the female mold core, and then fix the female mold core into the female mold plate using the adjusting bolt.

3. The method for preparing a flip-top molding die according to claim 1, characterized in that: In the first step, the master mold core is equipped with an insert block.

4. The method for preparing a flip-top molding die according to claim 3, characterized in that: The slider has a groove that mates with the insert block.

5. The method for preparing a flip-top molding die according to claim 3, characterized in that: The groove has inclined slots on both sides, and rounded corners are provided near the edge of the inclined slots.

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