A thin plate injection molding process with dense pores

Abstract

The present invention discloses a thin plate injection molding process with dense fine pores, comprising the following steps: closing the injection mold, molding a thin plate product in the injection mold, and molding dense fine pores on the thin plate product through a first pin assembly and a second pin assembly; opening the injection mold and performing a first ejection and demolding action to separate the thin plate product from the first pin assembly; and performing a second ejection and demolding action on the injection mold to separate the thin plate product from the second pin assembly. The purpose of the present invention is to provide a thin plate injection molding process with dense fine pores, which can effectively reduce the probability of deformation or strain during demolding of the product by core-pulling the pins used for molding dense fine pores on the thin plate product in two steps, thereby improving product quality and pass rate and increasing the production competitiveness of the enterprise.

Description

Technical Field

[0001] The invention relates to a thin plate injection molding process with dense pores. Background Art

[0002] Injection molding is a process used for mass production of complex-shaped components. Specifically, it involves injecting heated, molten plastic into a mold cavity under high pressure using an injection molding machine. After cooling and solidification, the resulting molded product is formed. Due to the wide variety of plastics and processing methods, as well as the varying complexity of plastic molding machines and the simpler or more complex structures of plastic products, the types and structures of plastic molds are also diverse. While mold structure can vary greatly depending on the type and properties of the plastic, the shape and structure of the product, and the type of injection molding machine, the basic structure remains the same. Currently, injection mold core pulling typically utilizes a motorized or hydraulic core pulling mechanism, allowing for single-step demolding. However, when producing thin, densely porous products, using a single forced core pulling mechanism can lead to product damage and deformation, resulting in high defective and scrap rates, hindering companies from improving product quality and production efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a thin plate injection molding process with dense fine pores. By pulling out the core of the pins used to mold dense fine pores on the thin plate product in two steps, the probability of deformation or stretching of the product during demolding can be effectively reduced.

[0004] To achieve the above object, the technical solution of the present invention is to design a thin plate injection molding process with dense pores, comprising the following steps:

[0005] The injection mold is closed to form a thin plate product in the injection mold, and dense fine holes are formed on the thin plate product by using the first and second pin inserting assemblies;

[0006] The injection mold is opened and the first ejection and demoulding action is performed to separate the thin plate product from the first pin assembly;

[0007] The injection mold performs a second ejection and demoulding action to separate the thin plate product from the second pin assembly.

[0008] Preferably, the step of performing the first ejection and demoulding action to separate the thin plate product from the first pin inserting assembly specifically includes:

[0009] The first pin inserting assembly remains stationary, and the second pin inserting assembly and the thin plate product are driven to move a first set distance together through the ejection plate, thereby pulling the first pin of the first pin inserting assembly out of the thin plate product, so that the thin plate product is separated from the first pin inserting assembly.

[0010] Preferably, the step of performing a second ejection and demoulding action to separate the thin plate product from the second pin inserting assembly specifically includes:

[0011] The second pin inserting assembly is kept stationary, and the thin plate product is driven to move a second set distance by the ejection plate, so that the second pin of the second pin inserting assembly is pulled out from the thin plate product, so that the thin plate product is separated from the second pin inserting assembly.

[0012] Preferably, after the injection mold performs a second ejection and demoulding action to separate the thin plate product from the second pin-inserting assembly, the step further includes:

[0013] The injection mold performs the third ejection and demoulding action to eject the thin plate product from the cavity of the injection mold.

[0014] Preferably, the step of forming the thin plate product in the injection mold specifically includes:

[0015] The molten plastic raw material is injected into the cavity of the injection mold, and the thin plate product is formed through pressure maintenance, cooling, and solidification.

[0016] Preferably, the thickness of the thin plate product is less than 1.2 mm.

[0017] Preferably, the number of pores on the thin plate product is more than 5,000.

[0018] The advantages and beneficial effects of the present invention are: providing a thin plate injection molding process with dense fine pores, by pulling out the core of the pins used to mold dense fine pores on the thin plate product in two steps, which can effectively reduce the probability of deformation or stretching of the product during demolding, thereby improving product quality and pass rate, and increasing the company's production competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the lower mold in the present invention.

[0020] Figure 2 It is a schematic diagram of the first pin-inserting component and the thin plate product in the present invention.

[0021] Figure 3 It is a schematic diagram of the second pin-inserting component in the present invention when it is matched with the thin plate product.

[0022] Figure 4 It is a schematic diagram of the injection mold of the present invention when the first ejection and demoulding are completed.

[0023] Figure 5 It is a schematic diagram of the injection mold of the present invention when completing the second ejection and demoulding. DETAILED DESCRIPTION

[0024] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] The technical solution specifically implemented in the present invention is:

[0026] like Figures 1 to 5 As shown, a thin plate injection molding process with dense pores includes the following steps:

[0027] The injection mold is closed, and molten plastic raw material is injected into the cavity of the injection mold. After pressure maintenance, cooling, and solidification, the thin plate product 100 is formed, and dense fine holes are formed on the thin plate product 100 through the first and second pin assemblies. The specific structure of the injection mold includes an upper mold, a lower mold and an ejection mechanism. The upper mold and the lower mold are closed to form the cavity. The lower mold includes a second movable plate 1, a second mounting plate 2, a first movable plate 3 and a first mounting plate 4 stacked in sequence from top to bottom. The second movable plate 2 is provided with a lower mold cavity, and the thin plate product 100 is located in the lower mold cavity. The first pin inserting assembly includes a plurality of first pin inserting groups 5 arranged side by side at equal intervals on the first mounting plate 4. The second pin inserting assembly includes a plurality of second pin inserting groups 6 arranged side by side at equal intervals on the second mounting plate 2. The plurality of first pin inserting groups 5 and the plurality of second pin inserting groups 6 are arranged alternately. Each first pin inserting group 5 includes a plurality of first pin inserting pins 51, and each second pin inserting group 6 includes a plurality of second pin inserting pins 61. The first pin inserting pins 51 and the second pin inserting pins 61 both extend into the lower mold cavity to form dense pores on the thin plate product 100. The ejection mechanism includes an ejection plate located below the first mounting plate 4.

[0028] The injection mold is opened and the first ejection and demoulding action is performed. Specifically, the first pin assembly is kept stationary, and the second pin assembly and the thin plate product 100 are driven by the ejection plate to move together by a first set distance, so that the first pin 51 of the first pin assembly is pulled out from the thin plate product 100, so that the thin plate product 100 is separated from the first pin assembly; wherein, a hollow ejector column 7 is provided on the ejection plate, and a sleeve 8 with a step 81 on the inner wall is provided in the first movable plate 3, and the two ends of the ejector column 7 are respectively a fixed end and a second end. The fixing end 71 is fixedly connected to the ejection plate, and the fixing end 71 extends into the interior of the sleeve 8, and the fixing end 71 can be elastically retracted or expanded. A fixing rod 9 is coaxially provided inside the ejector column 7, and one end of the fixing rod 9 is supported in the fixing end 71 to prevent the fixing end 71 from retracting. A first inclined surface is provided on the outer wall of the fixing end 71, and the step surface of the step 81 is a second inclined surface 811, and the second inclined surface 811 is in contact with the first inclined surface; therefore, the specific process of the injection mold performing the first ejection and demoulding action is as follows: through The external power mechanism drives the ejector plate upward, and the ejector plate drives the ejector column 7 to move upward relative to the fixed rod 9. Since the fixed rod 9 is blocked inside the action end 71, the action end 71 of the ejector column 7 cannot be retracted during the upward movement, and the ejector column 7 will push the sleeve 8 and the first movable plate 3 fixed to the sleeve 8 upward through the cooperation between the action end 71 and the step 81, so that the first movable plate 3 is separated from the first mounting plate 4, and the first movable plate 3 will drive the second mounting plate 2, the second movable plate 1 and the thin plate product on the second movable plate 1. 100, during which the second pin inserting assembly and the thin plate product 100 remain relatively stationary until the thin plate product 100 moves upward for a first set distance, at which time the first pin 51 on the first mounting plate 4 is withdrawn from the thin plate product 100, so that the thin plate product 100 is separated from the first pin inserting assembly, thereby completing the first ejection and demoulding action of the injection mold. When the first ejection and demoulding action is completed, the active end 71 of the ejector post 7 has passed over the fixing rod 9, and the fixing rod 9 can no longer prevent the active end 71 from retracting.

[0029] The injection mold performs a second ejection and demoulding action. Specifically, the second pin assembly remains stationary, and the ejector plate drives the thin plate product 100 to move a second set distance together, so that the second pin 61 of the second pin assembly is pulled out from the thin plate product 100, so that the thin plate product 100 is separated from the second pin assembly; wherein, the outer side of the ejector plate is connected to the ejector block 10, the outer side of the lower mold is provided with a push rod 11, and a transmission plate 12 is provided between the push rod 11 and the second movable plate 1, and the transmission plate 12 is fixed to the second movable plate 1, and the side of the transmission plate 12 is installed with a stopper 13 through a groove 121, and the stopper 13 partially protrudes from the groove 121 and blocks the Above the ejector block 10, the stopper 13 is connected to an elastic member 14, and the stopper 13 can extend or retreat into the groove 121. The push rod 11 is provided with a pushing inclined surface 111, and the pushing inclined surface 111 is used to drive the stopper 13 to retreat into the groove 121 to release the blockage of the ejector block 10 by the stopper 13. The stopper 13 is provided with a pushed inclined surface that cooperates with the pushing inclined surface 111; therefore, the specific process of the second ejection and demoulding action of the injection mold is as follows: the ejector plate is driven to continue to move upward by an external power mechanism, and the ejector plate drives the ejector column 7 and the ejector block 10 to move upward together. Since the fixed rod 9 can no longer prevent the working end 71 from retracting when the first ejection and demoulding action is completed, As the top column 7 continues to move upward, its active end 71 will elastically retract under the squeezing action of the second inclined surface 811, so that the active end 71 cannot exert a force on the sleeve 8 sufficient to move it, thereby keeping the first movable plate 3 stationary, and the second mounting plate 2 and the second pin assembly located above the first movable plate 7 also remain stationary. When the top block 10 moves upward, the stopper 13 blocks it above it, so the top block 10 will push the stopper 13 and the transmission plate 12 upward together. Since the transmission plate 12 is fixed to the second movable plate 1, the transmission plate 12 will drive the second movable plate 1 and the thin plate product 100 upward together, so that the second movable plate 3 remains stationary. The plate 1 is separated from the second mounting plate 2 until the thin plate product 100 moves upward for a second set distance, at which time the second inserting pin 61 on the second mounting plate 2 is pulled out from the thin plate product 100 to separate the thin plate product 100 from the second inserting pin assembly, thereby completing the second ejection and demoulding action of the injection mold. In addition, during the second ejection and demoulding action, the push rod 11 pushes the stopper 13 gradually back into the groove 121 by pushing the inclined surface 111 and compresses the elastic member 14 until the stopper 13 is completely back into the groove 121. The second ejection and demoulding action is completed, at which time the stopper 13 is separated from the ejector block 10, thereby releasing the obstruction of the stopper 13 on the ejector block 10.

[0030] The injection mold performs a third ejection and demoulding action to eject the thin plate product 100 from the cavity of the injection mold; wherein the ejection mechanism of the injection mold also includes a ejector pin provided on the ejector plate, and the ejector pin is used to eject the thin plate product 100; therefore, the specific process of the injection mold performing the third ejection and demoulding action is as follows: the ejector plate is driven to continue to move upward by an external power mechanism, and the ejector plate drives the ejector column 7, the ejector block 10 and the ejector pin to move upward together. During this process, since the ejector column 7 cannot apply a force to the sleeve 8, the first movable plate 3 will remain stationary. Moreover, since the stopper 13 has been separated from the ejector block 10 when the second ejection and demoulding action is completed, the ejector block 10 cannot apply a force to the transmission plate 12 when it moves upward. Therefore, the second movable plate 1 also remains stationary, and the upward movement of the ejector pin will eject the thin plate product 100 from the second movable plate 1, thereby completing the third ejection and demoulding.

[0031] Furthermore, the thickness of the thin plate product is less than 1.2 mm.

[0032] Furthermore, the number of pores on the thin plate product is more than 5,000.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A thin plate injection molding process with dense pores, comprising the following steps: The injection mold is closed, and a thin plate product is formed in the injection mold, and dense fine holes are formed on the thin plate product by the first pin assembly and the second pin assembly; the injection mold includes an upper mold, a lower mold and an ejection mechanism, the lower mold includes a second movable plate, a second mounting plate, a first movable plate and a first mounting plate stacked in sequence from top to bottom, the second movable plate is provided with a lower mold cavity, the thin plate product is located in the lower mold cavity, the first pin assembly includes a plurality of first pin groups arranged side by side on the first mounting plate at equal intervals, the second pin assembly includes a plurality of second pin groups arranged side by side on the second mounting plate at equal intervals, and the plurality of first pin groups and the plurality of second pin groups are alternately arranged, each first pin group includes a plurality of first pins, and each second pin group includes a plurality of The pin group includes a plurality of second pins, the first pins and the second pins both extend into the lower mold cavity to form dense fine holes on the thin plate product, the ejection mechanism includes an ejection plate located below the first mounting plate, the ejection plate is provided with an ejector column with a hollow structure, the first movable plate is provided with a sleeve with a step on the inner wall, the two ends of the ejector column are respectively a fixed end and an active end, the fixed end is fixedly connected to the ejection plate, the active end extends into the interior of the sleeve, and the active end can be elastically retracted or expanded, a fixed rod is coaxially provided inside the ejector column, one end of the fixed rod is supported in the active end to prevent the active end from retracting, a first inclined surface is provided on the outer wall of the active end, the stepped surface is a second inclined surface, and the second inclined surface is in contact with the first inclined surface, and the outer side of the ejection plate is connected to a ejection block; The injection mold is opened and the first ejection and demoulding action is performed, so that the first pin inserting assembly remains stationary, and the second pin inserting assembly and the thin plate product are driven by the ejection plate to move a first set distance together, so that the first pin of the first pin inserting assembly is pulled out from the thin plate product, so that the thin plate product is separated from the first pin inserting assembly; the process of the first ejection and demoulding action is: the ejection plate is driven upward by an external power mechanism, and the ejection plate drives the ejector column to move upward relative to the fixed rod. Since the fixed rod is blocked inside the active end, the active end of the ejector column cannot be retracted during the upward movement, and the ejector column will push the sleeve and the sleeve through the cooperation between the active end and the step. The first movable plate fixed by the cylinder moves upward, separating the first movable plate from the first mounting plate, and the first movable plate drives the second mounting plate, the second movable plate and the thin plate product on the second movable plate to move upward together. During this process, the second pin assembly and the thin plate product remain relatively stationary until the thin plate product moves upward a first set distance, at which time the first pin on the first mounting plate is pulled out from the thin plate product to separate the thin plate product from the first pin assembly, thereby completing the first ejection and demoulding action of the injection mold. When the first ejection and demoulding action is completed, the active end of the ejector column has passed the fixed rod, and the fixed rod can no longer prevent the active end from retracting. The injection mold performs a second ejection and demoulding action, so that the second pin assembly remains stationary, and the thin plate product is driven to move a second set distance by the ejector plate, so that the second pin of the second pin assembly is pulled out from the thin plate product, so that the thin plate product is separated from the second pin assembly; during the second ejection and demoulding action, the ejector plate is driven to continue to move upward by an external power mechanism, and the ejector plate drives the ejector column and the ejector block to move upward together. Since the fixed rod can no longer prevent the effective end from retracting when the first ejection and demoulding action is completed, the effective end of the ejector column will elastically retract under the extrusion of the second inclined surface during the continued upward movement of the ejector column, so that the effective end cannot exert a force on the sleeve sufficient to move it, thereby keeping the first movable plate stationary, and the second mounting plate and the second pin assembly located above the first movable plate also remain stationary.

2. The thin plate injection molding process with dense pores according to claim 1, characterized in that: The outer side of the lower mold is provided with a push rod, and a transmission plate is provided between the push rod and the second movable plate. The transmission plate is fixed to the second movable plate, and a stopper is installed on the side of the transmission plate through a groove. The stopper part protrudes from the groove and blocks the top of the top block. The stopper is connected with an elastic member, and the stopper can extend or retreat into the groove. A pushing inclined surface is provided on the push rod, and the pushing inclined surface is used to drive the stopper to retreat into the groove to release the blockage of the top block by the stopper, and a pushed inclined surface is provided on the stopper that cooperates with the pushing inclined surface. During the second ejection and demoulding action, when the top block moves upward, the stopper blocks the top of it, so the top block moves the stopper and the transmission plate upward together, and because the transmission plate and the first The two movable plates are fixed to each other, so the transmission plate will drive the second movable plate and the thin plate product to move upward together, so that the second movable plate is separated from the second mounting plate, until the thin plate product moves upward for a second set distance, and the second inlay pin on the second mounting plate will be pulled out from the thin plate product to separate the thin plate product from the second inlay pin assembly, thereby completing the second ejection and demolding action of the injection mold, and in the process of the second ejection and demolding action, the push rod will push the block to gradually retreat into the groove by pushing the inclined surface and compress the elastic part until the block is completely retreated into the groove, and the second ejection and demolding action is completed, at this time the block is separated from the top block, thereby releasing the block's obstruction to the top block.

3. The thin plate injection molding process with dense pores according to claim 2, characterized in that: After the injection mold performs a second ejection and demoulding action to separate the thin plate product from the second pin-inserted assembly, the injection mold further includes: a third ejection and demoulding action to eject the thin plate product from the cavity of the injection mold; the ejection mechanism also includes an ejector pin provided on the ejector plate, the ejector pin being used to eject the thin plate product; the process of the third ejection and demoulding action is: the ejector plate is driven to continue to move upward by an external power mechanism, and the ejector plate drives the ejector column, the ejector block and the ejector pin to move upward together; during this process, the ejector column cannot apply a force to the sleeve, so the first movable plate will remain stationary; and since the stop block has been separated from the ejector block when the second ejection and demoulding action is completed, the ejector block cannot apply a force to the transmission plate when it moves upward, so the second movable plate also remains stationary, and the upward movement of the ejector pin will eject the thin plate product from the second movable plate, thereby completing the third ejection and demoulding.

4. The thin plate injection molding process with dense pores according to claim 1, characterized in that: The step of forming the thin plate product in the injection mold specifically includes: injecting molten plastic raw material into the cavity of the injection mold, maintaining pressure, cooling, and solidifying to form the thin plate product.

5. The thin plate injection molding process with dense pores according to claim 1, characterized in that: The thickness of the thin plate product is less than 1.2 mm.

6. The thin plate injection molding process with dense pores according to claim 2, characterized in that: The number of pores on the thin plate product is more than 5,000.

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