An in-mold cutting injection mold and its usage method

Abstract

The present invention provides an in-mold cutting injection mold and its usage method. The in-mold cutting injection mold includes a fixed mold and a moving mold. The moving mold is connected to the fixed mold to form a mold cavity. The in-mold cutting injection mold further includes: a sprue plate, which is arranged on the moving mold, and a sprue communicating with the mold cavity is arranged on the sprue plate; an ejection mechanism, which is movably arranged on the moving mold; a cutting tool, one end of the cutting tool is connected to the ejection mechanism, and the other end of the cutting tool is located at the connection position between the sprue plate and the mold cavity. The cutting tool cuts the sprue material at the connection position between the sprue plate and the mold cavity through the drive of the ejection mechanism. By setting the cutting tool and driving it through the ejection mechanism, automatic in-mold removal of the sprue material connected to the injection product is achieved, eliminating the operation difficulty of manual removal and improving production efficiency. At the same time, the sprue material is removed when the injection product is not completely cooled and hardened, eliminating the breaking marks presented on the injection product.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding production, and in particular to an in-mold cutting injection mold and a use method thereof. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The injection molding process can be roughly divided into the following six stages: mold closing, injection, pressure holding, cooling, mold opening, and product removal. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, a wide variety of colors, shapes from simple to complex, sizes from large to small, and precise product size. The product is easy to update and can be made into complex-shaped parts. Injection molding is suitable for mass production and complex-shaped products and other molding and processing fields.

[0003] Injection molding is inseparable from injection molds. Usually, a sprue is set on the injection mold. The injected molten glue fills the mold cavity through the sprue. After pressure maintenance, a plastic product is formed in the mold cavity. At the same time, the molten glue remaining in the sprue will form a sprue material that adheres to the injection molded product. After the injection molding is completed, the cooled sprue material is firmly adhered to the injection molded product, and the operator needs to manually cut off the cooled sprue material. The whole process is time-consuming and labor-intensive, and the injection molded product after manual cutting is often prone to breakage marks, and the operator needs to deal with the breakage marks later, which is very troublesome.

[0004] Therefore, how to provide an in-mold cutting injection mold that can realize automatic in-mold cutting and effectively eliminate break marks has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, an in-mold cutting injection mold and a method of using the same are provided, aiming to solve the problem in the prior art that the upper nozzle material of the injection molded product needs to be manually cut off and the injection molded product is prone to breakage marks.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: an in-mold cutting injection mold, comprising a fixed mold and a movable mold, wherein the movable mold is connected with the fixed mold to form a mold cavity, and the in-mold cutting injection mold further comprises:

[0007] A nozzle plate, the nozzle plate is arranged on the movable mold, and a nozzle communicating with the mold cavity is arranged on the nozzle plate;

[0008] An ejection mechanism, the ejection mechanism being movably disposed on the movable mold;

[0009] A cutting tool, one end of which is connected to the ejection mechanism, and the other end of which is located at the junction of the sprue plate and the mold cavity, wherein the cutting tool is driven by the ejection mechanism to cut the sprue material at the junction of the sprue plate and the mold cavity.

[0010] Furthermore, the in-mold cutting injection mold further comprises:

[0011] A nozzle plate, wherein the nozzle plate is arranged on the fixed mold and is provided with a glue injection hole communicating with the water inlet;

[0012] The cutting tool comprises a first cutting knife and a second cutting knife which are symmetrically arranged; the first cutting knife and the second cutting knife both comprise:

[0013] Cutter body;

[0014] A cutter orientation column, the cutter orientation column is connected to an end of the cutter body away from the ejection mechanism;

[0015] Wherein, guide grooves are provided on both side surfaces of the nozzle plate along the width direction, the guide grooves are provided along the height direction, and the cutter orientation column is inserted into the guide grooves.

[0016] Furthermore, an oriented column guide cone is provided at one end of the cutter oriented column away from the cutter body, and the thickness of the oriented column guide cone gradually decreases in a direction away from the cutter body.

[0017] Furthermore, the first cutter and the second cutter both include:

[0018] The blade portion is connected to the cutter body, the blade portion is located at the connecting position of the mold cavity and the water inlet, and the two ends of the blade portion along the length direction are respectively connected to two of the cutter directional columns.

[0019] Furthermore, the blade portion includes:

[0020] Blade body;

[0021] An avoidance groove, the avoidance groove is located on a side of the blade body facing the water outlet, and the avoidance groove is concave inwardly along a height direction;

[0022] Among them, one end face of the blade body facing away from the water inlet abuts against the mold cavity, and one end face of the blade body facing away from the cutter body is arranged parallel to the top surface of the fixed mold and connected to the groove wall of the avoidance groove.

[0023] Further, a clearance ramp is provided at the position of the nozzle plate corresponding to the blade part. The two ends of the clearance ramp along the length direction are respectively connected to the two guide grooves, and the bottom of the clearance ramp is lower than the top surface of the fixed mold in the height direction.

[0024] Further, the in-mold cutting injection mold further includes:

[0025] A plurality of first precise positioning members, and the plurality of first precise positioning members are arranged on the moving mold;

[0026] A plurality of second precise positioning members, and the plurality of second precise positioning members are arranged on the fixed mold corresponding to the plurality of first precise positioning members, and the plurality of second precise positioning members are arranged in cooperation with the plurality of first precise positioning members.

[0027] Further, the ejection mechanism includes:

[0028] A top plate, and the top plate is used for externally connecting an injection molding machine ejector rod;

[0029] A plurality of reset guide rods, one ends of the plurality of reset guide rods are all connected to the top plate, and the other ends of the plurality of reset guide rods are all slidably connected to the moving mold;

[0030] A plurality of reset springs, the reset springs are sleeved on the reset guide rods, one ends of the plurality of reset springs are connected to the top plate, and the other ends of the plurality of reset springs are connected to the moving mold;

[0031] Wherein, one end face of the top plate close to the fixed mold is connected to the cutting tool.

[0032] Further, the ejection mechanism further includes:

[0033] A ejector pin, one end of the ejector pin is connected to the top plate, the other end of the ejector pin is disposed opposite to the sprue, and sequentially penetrates through the moving mold and the sprue plate.

[0034] Another technical solution adopted by the present invention to solve the technical problem is as follows: A method for using an in-mold cutting injection mold as described above, characterized in that it includes the following steps:

[0035] After the injection molding and holding pressure are completed and cooled for a first predetermined time, the injection molding machine ejector rod ejects for the first time, and the ejection mechanism drives the cutting tool to cut off the sprue material to obtain an injection molded product separated from the sprue material;

[0036] Continue to cool the sprue material and the injection molded product. After cooling for a second predetermined time, the fixed mold and the moving mold are opened, the injection molding machine ejector rod ejects for the second time, and the top plate drives the ejector pin to eject the sprue material from the sprue;

[0037] Take out the injection molded product.

[0038] The present invention provides an in-mold cutting injection mold and a method for using the same. The in-mold cutting injection mold includes a fixed mold and a movable mold. The movable mold is connected to the fixed mold to form a mold cavity. The in-mold cutting injection mold further includes: a sprue plate, which is arranged on the movable mold, and a sprue communicating with the mold cavity is arranged on the sprue plate; an ejection mechanism, which is movably arranged on the movable mold; a cutting tool, one end of the cutting tool is connected to the ejection mechanism, and the other end of the cutting tool is located at the connection position between the sprue plate and the mold cavity. The cutting tool cuts the sprue material at the connection position between the sprue plate and the mold cavity under the drive of the ejection mechanism. It can be understood that by providing the sprue plate, the sprue, the cutting tool and the mold cavity form a pouring channel, which provides a guarantee for the injection mold to inject and form an injection product; by providing the ejection mechanism and movably arranging the ejection mechanism on the movable mold, the ejection mechanism can move after the movable mold and the fixed mold are closed, and then drive the cutting tool to perform a cutting action, which provides a guarantee for realizing in-mold cutting of the sprue material; by arranging the cutting tool at the connection position between the sprue plate and the mold cavity, the cutting tool can automatically cut the sprue material connected to the injection product in the mold under the drive of the ejection mechanism, effectively eliminating the operation difficulty of manually cutting the sprue material and improving the production efficiency. At the same time, the cutting tool can cut the sprue material when the injection product is not completely cooled and hardened after the pressure holding is over, thereby effectively eliminating the break marks on the injection product after cutting the sprue material and effectively reducing the subsequent processing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a three-dimensional structural schematic diagram of the in-mold cutting injection mold provided by the present invention;

[0040] Figure 2 is a partial three-dimensional structural schematic diagram of the in-mold cutting injection mold provided by the present invention;

[0041] Figure 3 is another partial three-dimensional structural schematic diagram of the in-mold cutting injection mold provided by the present invention;

[0042] Figure 4 is a three-dimensional exploded structural schematic diagram of the in-mold cutting injection mold provided by the present invention;

[0043] Figure 5 is a three-dimensional structural schematic diagram of the cooperation relationship between the first cutting tool, the second cutting tool, the cutting tool fixing plate, the sprue plate and the nozzle plate in the in-mold cutting injection mold provided by the present invention;

[0044] Figure 6 is a partial schematic diagram of the cross-section of the in-mold cutting injection mold provided by the present invention;

[0045] Figure 7 It is a partial schematic view of the cross-section of another embodiment of the in-mold cutting injection mold provided in the present invention;

[0046] Figure 8 It is a schematic flow chart of the usage method of the in-mold cutting injection mold provided in the present invention;

[0047] Explanation of reference numerals:

[0048] 10. In-mold cutting injection mold; 11. Moving mold; 12. Fixed mold; 13. Sprue plate; 14. Ejecting mechanism; 15. Cutting tool; 16. Nozzle plate; 17. Spout part; 18. First precise positioning part; 19. Second precise positioning part; 19a. Cooling channel; 19b. Mold cavity; 111. Moving mold fixing plate; 112. Pad iron; 113. Moving template; 114. Moving mold core; 115. Guide pillar; 121. Fixed mold fixing plate; 122. Fixed template; 123. Fixed mold core; 124. Guide bush; 131. Sprue; 132. Knife slideway; 141. Top plate; 142. Return guide rod; 143. Return spring; 144. Sliding guide rod; 145. Sliding sleeve; 146. Knife fixing plate; 147. Ejector pin; 1411. Upper top plate; 1412. Lower top plate; 1461. Knife fixing hole; 151. First cutter; 152. Second cutter; 153. Cutter body; 154. Cutter orientation column; 155. Blade part; 156. Hook part; 1541. Orientation column leading cone; 1551. Blade body; 1552. Avoidance groove; 161. Glue injection hole; 162. Guide groove; 163. Avoidance slope; 171. Tapered hole. Detailed implementation manners

[0049] In order to make the purpose, technical solutions and advantages of the present invention clearer and more definite, the following further elaborates on the present invention by way of examples with reference to the accompanying drawings. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] Injection molding, also known as injection moulding, is a forming method that combines injection and moulding. The injection molding process can be roughly divided into the following six stages: mold closing, injection, holding pressure, cooling, mold opening, and product removal. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, a wide variety of colors and patterns, the ability to form products with simple to complex shapes and sizes ranging from large to small, precise product dimensions, easy product replacement, and the ability to form complex-shaped parts. Injection molding is suitable for mass production and the forming and processing of complex-shaped products. Injection molding cannot do without injection molds. Usually, a sprue is set on the injection mold. The molten plastic for injection fills the mold cavity through the sprue. After holding pressure, a plastic product is formed in the mold cavity. At the same time, the molten plastic remaining in the sprue will form sprue material that adheres to the injection product. After injection molding, the cooled sprue material adheres firmly to the injection product, and operators need to manually cut the cooled sprue material. The whole process is time-consuming and laborious. Moreover, the injection products after manual cutting often tend to show breakage marks, and then operators need to deal with the breakage marks, which is very troublesome.

[0051] Based on the problems in the prior art that it is necessary to manually cut the sprue material on the injection product and breakage marks are likely to appear on the injection product, the present invention provides an in-mold cutting injection mold and its use method. By setting a sprue plate, the sprue, cutting tool, and mold cavity form a pouring channel, which provides a guarantee for the injection mold to inject and form an injection product. By setting an ejection mechanism and movably arranging the ejection mechanism on the moving mold, the ejection mechanism can move after the moving mold and the fixed mold are closed, thereby driving the cutting tool to perform a cutting action, which provides a guarantee for realizing in-mold cutting of the sprue material. By setting a cutting tool at the connection position between the sprue plate and the mold cavity, the cutting tool can automatically cut the sprue material connected to the injection product in the mold under the drive of the ejection mechanism, effectively eliminating the operation difficulty of manually cutting the sprue material and improving the production efficiency. At the same time, the cutting tool can cut the sprue material when the injection product has not completely cooled and hardened after the holding pressure is over, thereby effectively eliminating the breakage marks on the injection product after cutting the sprue material and effectively reducing the subsequent processing difficulty. For specific details, please refer to the following embodiments.

[0052] Please refer to Figures 1 to 3, in the first embodiment of the present invention, an in-mold cutting injection mold 10 is provided, which includes a fixed mold 12, a moving mold 11, a sprue plate 13, an ejection mechanism 14 and a cutting tool 15; the moving mold 11 is connected to the fixed mold 12 to form a mold cavity 19b; the sprue plate 13 is arranged on the moving mold 11, and a sprue 131 communicating with the mold cavity 19b is arranged on the sprue plate 13; the ejection mechanism 14 is movably arranged on the moving mold 11; one end of the cutting tool 15 is connected to the ejection mechanism 14, and the other end of the cutting tool 15 is located at the connection position between the sprue plate 13 and the mold cavity 19b, and the cutting tool 15 cuts the sprue material at the connection position between the sprue plate 13 and the mold cavity 19b by the drive of the ejection mechanism 14.

[0053] It can be understood that after the moving mold 11 and the fixed mold 12 in the injection mold are closed, a mold cavity 19b is formed. The present invention does not limit the number of mold cavities 19b. According to actual production needs, the mold cavity 19b can be set to 1, 2, 4, etc.; the ejection mechanism 14 is movably arranged on the moving mold 11, and the ejection mechanism 14 can move on the moving mold 11; a cutting tool 15 is connected to the ejection mechanism 14, and the cutting tool 15 is arranged at the connection position between the sprue plate 13 and the mold cavity 19b, and a sprue 131 communicating with the mold cavity 19b is arranged on the sprue plate 13, that is, the cutting tool 15 is arranged at the connection position between the sprue 131 and the mold cavity 19b; the cutting tool 15 is driven by the ejection mechanism 14, and the cutting tool 15 performs a cutting action at the connection position between the sprue 131 and the mold cavity 19b; before the cutting tool 15 performs a cutting action, the sprue 131 and the mold cavity 19b are communicated; after the fixed mold 12 and the moving mold 11 are closed, the injection melt sequentially passes through the sprue 131 and the cutting tool 15 and enters the mold cavity 19b to fill the mold cavity 19b; after the injection holding pressure is completed, an injection product is formed in the mold cavity 19b, and the melt in the sprue 131 forms a sprue material. At this time, the injection product is connected to the sprue material; when the mold is not opened, the cutting tool 15 is driven by the ejection mechanism 14 to cut the sprue material, realizing in-mold cutting of the sprue material connected to the injection product, and the sprue material can be cut after the holding pressure is completed and the injection product is not completely cooled and hardened, avoiding the influence of the hardness of the injection product on the cutting effect and causing a break mark on the cut injection product; by arranging the sprue plate 13, the sprue 131, the cutting tool 15 and the mold cavity 19b form a pouring channel for the injection melt to flow through, providing guarantee for the injection molding of the injection product in the injection mold; by arranging the ejection mechanism 14 and movably arranging the ejection mechanism 14 on the moving mold 11, the ejection mechanism 14 can move after the moving mold 11 and the fixed mold 12 are closed, and then drive the cutting tool 15 to perform a cutting action, providing guarantee for realizing in-mold cutting of the sprue material; by arranging the cutting tool 15 at the connection position between the sprue plate 13 and the mold cavity 19b, the cutting tool 15 can automatically cut the sprue material connected to the injection product in the mold under the drive of the ejection mechanism 14, effectively eliminating the operation difficulty of manually cutting the sprue material and improving the production efficiency. At the same time, the cutting tool 15 can cut the sprue material after the holding pressure is completed and the injection product is not completely cooled and hardened, thereby effectively eliminating the break mark on the injection product after cutting the sprue material and effectively reducing the subsequent processing difficulty.

[0054] Please refer to Figures 2 to 4In some preferred embodiments, the movable mold 11 includes a movable mold fixing plate 111, a washer 112, a movable mold plate 113 and a movable mold core 114 which are sequentially arranged along the height direction, and the two washer irons 112 are arranged on the bottom surface of the movable mold fixing plate 111 along the height direction, and are located at both ends of the movable mold fixing plate 111 along the length direction; the movable mold plate 113 is arranged on one end of the washer iron 112 away from the movable mold fixing plate 111; the movable mold core 114 is embedded on the bottom surface of the movable mold plate 113; the fixed mold 12 includes The fixed mold plate 121, the fixed mold plate 122 and the fixed mold core 123 are sequentially arranged along the height direction, the fixed mold plate 122 is arranged on the top surface of the fixed mold plate 121 along the height direction, and the fixed mold core 123 is embedded in the top surface of the fixed mold plate 122; after the movable mold 11 and the fixed mold 12 are molded together, the movable mold core 114 and the fixed mold core 123 are connected to form a mold cavity 19b; the nozzle plate 13 is embedded in the movable mold core 114, and the end surface of the nozzle plate 13 facing away from the fixed mold core 123 is connected to the movable mold plate 11 3; the ejector mechanism 14 is arranged between the movable mold fixing plate 111 and the movable mold plate 113, one end of the ejector mechanism 14 along the height direction is against the movable mold fixing plate 111, and the ejector mechanism 14 is slidably connected with the movable mold fixing plate 111 and the movable mold plate 113, so that the ejector mechanism 14 can move on the movable mold 11, which provides a guarantee for driving the cutting tool 15 to cut off the sprue material on the injection molded product; one end of the cutting tool 15 is connected to the ejector mechanism 14, and the cutting tool 1 The other end of the movable mold plate 113, the movable mold core 114 and the sprue plate 13 are sequentially penetrated along the height direction; the movable mold 11 further includes a plurality of guide pillars 115, and the fixed mold 12 further includes a plurality of guide sleeves 124 arranged corresponding to the plurality of guide pillars 115; after the movable mold 11 and the fixed mold 12 are molded together, the guide pillars 115 are matched and connected with the guide sleeves 124; by providing a plurality of guide pillars 115 and a plurality of guide sleeves 124, the mold closing accuracy of the movable mold 11 and the fixed mold 12 is improved, thereby improving the yield rate of the injection molded products of the injection mold.

[0055] Please continue to refer to Figure 2 and Figure 3In some preferred embodiments, the fixed mold 12 and the movable mold 11 are both provided with a plurality of cooling channels 19a. Specifically, the movable mold plate 113 and the fixed mold plate 122 are both provided with a plurality of cooling channels 19a. By providing a plurality of cooling channels 19a, the coolant cools the injection mold through the plurality of cooling channels 19a, thereby realizing the cooling of the injection molded product and the sprue material after pressure holding, and providing effective protection for the injection molding process of the injection mold. At the same time, by controlling the time and speed of the coolant passing into the plurality of cooling channels 19a, the cooling speed of the injection mold can be controlled, thereby improving the flexibility and controllability of the injection molding process of the injection mold.

[0056] Please continue to refer to Figure 3 and Figure 5 In some other preferred embodiments, the in-mold cutting injection mold 10 also includes a nozzle plate 16, which is arranged on the fixed mold 12, and is provided with a glue injection hole 161 communicated with the water inlet 131; the cutting tool 15 includes a first cutter 151 and a second cutter 152 which are symmetrically arranged; the first cutter 151 and the second cutter 152 both include a cutter body 153 and a cutter directional column 154; the cutter directional column 154 is connected to one end of the cutter body 153 away from the ejection mechanism 14; wherein, guide grooves 162 are provided on both side surfaces of the nozzle plate 16 along the width direction, the guide grooves 162 are provided along the height direction, and the cutter directional column 154 is inserted into the guide grooves 162.

[0057] It can be understood that the nozzle plate 16 is arranged on the fixed mold 12, and glue injection holes 161 communicating with the water inlet 131 are arranged on the nozzle plate 16. Specifically, the nozzle plate 16 is embedded in the fixed mold 12, and the nozzle plate 16 is arranged corresponding to the water inlet plate 13. Glue injection holes 161 communicating with the water inlet 131 are arranged on the nozzle plate 16. The nozzle plate 16, the water inlet plate 13 and the cutting tool 15 form a pouring system. The injection molding melt is injected into the water inlet 131 through the glue injection holes 161 and then into the mold cavity 19b through the cutting tool 15, providing guarantee for the injection molding of the injection mold. There are two mold cavities 19b. The cutting tool 15 includes a first cutting knife 151 and a second cutting knife 152. Through the first cutting knife 151 and the second cutting knife 152, the injection molded products in the two mold cavities 19b can be separated from the sprue material at one time, effectively improving the production efficiency. Both the first cutting knife 151 and the second cutting knife 152 include a cutting knife body 153 and a cutting knife orientation column 154. Specifically, the cutting knife bodies 153 of the first cutting knife 151 and the second cutting knife 152 are symmetrically arranged on the two side surfaces of the water inlet plate 13 along the width direction, and cutting knife sliding grooves 132 for the cutting knife bodies 153 to slide are formed on the water inlet plate 13. The two cutting knife sliding grooves 132 are formed on the two side surfaces of the water inlet plate 13 along the width direction, and both the two cutting knife sliding grooves 132 are formed along the height direction. The cutting knife orientation columns 154 of the first cutting knife 151 and the cutting knife orientation columns 154 of the second cutting knife 152 are symmetrically arranged on the two side surfaces of the nozzle plate 16 along the width direction, and guiding grooves 162 for the cutting knife orientation columns 154 to slide are formed on the nozzle plate 16. The two guiding grooves 162 are formed on the two side surfaces of the water inlet plate 13 along the width direction, and both the two guiding grooves 162 are formed along the height direction. When the moving mold 11 and the fixed mold 12 are closed, the cutting knife orientation columns 154 are inserted into the guiding grooves 162. By arranging the cutting knife orientation columns 154 and the guiding grooves 162, the guiding grooves 162 limit the cutting knife orientation columns 154, thereby ensuring the accurate positioning of the first cutting knife 151 and the second cutting knife 152 to cut off the sprue material on the injection molded product under the drive of the ejector mechanism 14, and providing an effective guarantee for eliminating the break marks on the injection molded product caused by cutting the sprue material.

[0058] Please refer to Figure 6, in some preferred embodiments, the in-mold cutting injection mold 10 further includes a sprue piece 17 disposed in the injection hole 161. A tapered hole 171 communicating with the sprue 131 is provided on the sprue piece 17, and the aperture of the tapered hole 171 gradually decreases in a direction away from the sprue plate 13. By providing the sprue piece 17 and the tapered hole 171, the injection melt is sprayed to both sides of the sprue plate 13 through the tapered hole 171, ensuring that the injection melt flows evenly to the two side cavities 19b, which is beneficial to improving the injection effect during the injection process of the injection mold.

[0059] In some preferred embodiments, the cutting tool 15 further includes a symmetrically arranged third cutting knife and a fourth cutting knife. Correspondingly, the cavity 19b is provided with four. The structures of the first cutting knife 151, the second cutting knife 152, the third cutting knife and the fourth cutting knife are the same. By providing the first cutting knife 151, the second cutting knife 152, the third cutting knife and the fourth cutting knife, the injection products in the four cavities 19b can be separated from the sprue material at one time, effectively improving the production efficiency. The cutting knife body 153 of the third cutting knife and the cutting knife body 153 of the fourth cutting knife are symmetrically arranged on both side surfaces of the sprue plate 13 along the length direction, and a cutting knife slideway 132 for the cutting knife body 153 to slide is provided on the sprue plate 13. The two cutting knife slideways 132 are provided on both side surfaces of the sprue plate 13 along the length direction and are opened along the height direction. The cutting knife orientation columns 154 of the third cutting knife and the cutting knife orientation columns 154 of the fourth cutting knife are symmetrically arranged on both side surfaces of the nozzle plate 16 along the length direction, and a guiding groove 162 for the cutting knife orientation column 154 to slide is provided on the nozzle plate 16. The two guiding grooves 162 are provided on both side surfaces of the sprue plate 13 along the length direction, and both of the two guiding grooves 162 are opened along the height direction. When the moving mold 11 and the fixed mold 12 are clamped, the third cutting knife and the fourth cutting knife are both inserted into the guiding groove 162 through the cutting knife orientation columns 154. The number of cutting knives included in the cutting tool 15 can be set according to actual production needs. Specifically, the number of the cutting tool 15 corresponding to the cavity 19b can be set to 1, 2, 4, etc. The present invention does not limit the number of cutting knives. Setting the cutting knife to 1 or more belongs to the protection scope of the present invention.

[0060] Please continue to refer to Figure 5 , in some other preferred embodiments, a guiding cone 1541 is provided at one end of the cutting knife orientation column 154 away from the cutting knife body 153, and the thickness of the guiding cone 1541 gradually decreases in a direction away from the cutting knife body 153.

[0061] It can be understood that the thickness of the guiding cone 1541 of the guiding post gradually decreases in the direction away from the cutter body 153. Specifically, the thickness of the guiding cone 1541 of the guiding post can be the thickness in the width direction, the thickness in the length direction, or the thickness in both the width direction and the length direction. By providing the guiding cone 1541 of the guiding post, it is ensured that the cutter guiding post 154 accurately enters the guiding groove 162 when the moving mold 11 and the fixed mold 12 are closed, avoiding damage to the nozzle plate 16.

[0062] Please refer to Figure 5 and Figure 6 , in some other preferred embodiments, the first cutter 151 and the second cutter 152 further include a blade portion 155. The blade portion 155 is connected to the cutter body 153. The blade portion 155 is located at the connection position between the mold cavity 19b and the sprue 131, and both ends of the blade portion 155 in the length direction are respectively connected to the two cutter guiding posts 154.

[0063] It can be understood that the blade portion 155 is located at the connection position between the mold cavity 19b and the sprue 131, and both ends of the blade portion 155 in the length direction are respectively connected to the two cutter guiding posts 154. Specifically, after the moving mold 11 and the fixed mold 12 are closed, a channel for injecting the injection melt from the sprue 131 into the mold cavity 19b is formed by the blade portion 155, the two cutter guiding posts 154, and the nozzle plate 16. After the pressure holding is completed, the first cutter 151 and the second cutter 152 cut the sprue material through the blade portion 155 under the drive of the ejection mechanism 14, realizing the separation of the injection molded product and the sprue material in the mold without mold opening. By providing the blade portion 155 and connecting both ends of the blade portion 155 to the two cutter guiding posts 154, it provides a guarantee for separating the injection molded product and the sprue material in the mold without mold opening, enabling the two guiding posts to provide precise positioning for the cutting of the blade portion 155, thereby effectively improving the accuracy of the blade portion 155 in cutting the sprue material, and effectively avoiding the break marks on the injection molded product caused by cutting the sprue material.

[0064] Please refer to Figure 6 and Figure 7 , in some other preferred embodiments, the blade portion 155 includes a blade body 1551 and an avoidance groove 1552. The avoidance groove 1552 is located on the side of the blade body 1551 facing the sprue 131, and the avoidance groove 1552 is concave inward in the height direction. Among them, the end face of the blade body 1551 away from the sprue 131 abuts against the mold cavity 19b, the end face of the blade body 1551 away from the cutter body 153 is parallel to the top surface of the fixed mold 12 and is connected to the groove wall of the avoidance groove 1552.

[0065] It can be understood that the blade body 1551 abuts against the mold cavity 19b, and the relief groove 1552 is connected to the gate 131. Driven by the ejection mechanism 14, the blade body 1551 cuts the gate material connected to the injection molded product. Specifically, the blade body 1551 shears with the top surface of the fixed mold 12 through the end surface facing away from the cutter body 153 to cut off the gate material on the injection molded product; the width D of the end surface of the blade body 1551 facing away from the cutter body 153 can be set to 0.20 - 0.50 mm; by setting the end surface of the blade body 1551 facing away from the cutter body 153 to be parallel to the top surface of the fixed mold 12, the shearing effect between the blade body 1551 and the fixed mold 12 is ensured, providing an effective guarantee for the blade body 1551 to cut off the gate material on the injection molded product; the shearing effect of the blade body 1551 on the gate material is achieved by squeezing the gate material to deform. When the shearing force acts on the gate material, it will squeeze the gate material to deform. When the deformation exceeds the limit, the gate material is disconnected from the product; by setting the relief groove 1552, a deformation space is provided for the shearing effect of the blade body 1551 on the gate material, effectively ensuring the shearing effect of the blade body 1551 on the gate material and providing an effective guarantee for cutting off the gate material in the mold without mold opening.

[0066] Please continue to refer to Figure 5 and Figure 7 , in some other preferred embodiments, a relief ramp 163 is provided at the position of the nozzle plate 16 corresponding to the blade portion 155. The two ends of the relief ramp 163 in the length direction are respectively connected to the two guide grooves 162, and the bottom of the relief ramp 163 is lower than the top surface of the fixed mold 12 in the height direction.

[0067] It can be understood that by setting the relief ramp 163 and the bottom of the relief ramp 163 being lower than the top surface of the fixed mold 12 in the height direction, a feed space is provided for the blade body 1551, effectively ensuring the shearing effect of the blade body 1551 on the gate material and providing an effective guarantee for cutting off the gate material in the mold without mold opening.

[0068] Please continue to refer to Figure 2 and Figure 3 , in some other preferred embodiments, the in-mold cutting injection mold 10 further includes a plurality of first precision positioning members 18 and a plurality of second precision positioning members 19; a plurality of the first precision positioning members 18 are arranged on the moving mold 11; a plurality of the second precision positioning members 19 are arranged on the fixed mold 12 corresponding to the plurality of first precision positioning members 18, and the plurality of second precision positioning members 19 are arranged in cooperation with the plurality of first precision positioning members 18.

[0069] It can be understood that the first fine positioning member 18 can be set to 2, 4, etc.; the second fine positioning member 19 is correspondingly set to 2, 4, etc. according to the first fine positioning member 18; and a plurality of second fine positioning members 19 are arranged in cooperation with a plurality of the first fine positioning members 18. Specifically, the size of the second fine positioning member 19 is matched with that of the first fine positioning member 18. After the moving mold 11 and the fixed mold 12 are clamped, a plurality of the second fine positioning members 19 are connected in cooperation with a plurality of the first fine positioning members 18. By arranging a plurality of first fine positioning members 18 and a plurality of second fine positioning members 19, the centering positioning accuracy of the clamping of the moving mold 11 and the fixed mold 12 is effectively improved, and the centering positioning accuracy can be made less than 0.005 mm. Furthermore, the injection molding quality of the injection molded product is effectively improved, and at the same time, the alignment accuracy of the cutting tool 15 is improved, and thus the break marks caused when the cutting tool 15 cuts the gate material of the injection molded product are effectively eliminated.

[0070] Specifically, a first positioning protrusion or a first positioning groove is provided on a plurality of the first fine positioning members 18, and a second positioning groove or a second positioning protrusion is correspondingly provided on a plurality of the second fine positioning members 19. The first positioning protrusion is arranged in cooperation with the first positioning groove, and the first positioning groove is arranged in cooperation with the second positioning protrusion. After the moving mold 11 and the fixed mold 12 are clamped, the first positioning protrusion is connected in cooperation with the first positioning groove, and the first positioning groove is connected in cooperation with the second positioning protrusion, effectively improving the centering positioning accuracy of the clamping of the moving mold 11 and the fixed mold 12. The centering positioning accuracy can be made less than 0.005 mm. Furthermore, the injection molding quality of the injection molded product is effectively improved, and at the same time, the alignment accuracy of the cutting tool 15 is improved, and thus the break marks caused when the cutting tool 15 cuts the gate material of the injection molded product are effectively eliminated.

[0071] Please continue to refer to Figure 2 and Figure 3 , in some preferred embodiments, a plurality of the first fine positioning members 18 are embedded in the moving mold core 114, and a plurality of the second fine positioning members 19 are correspondingly embedded in the fixed mold core 123 according to a plurality of the first fine positioning members 18. A plurality of the first fine positioning members 18 are arranged in cooperation with a plurality of the second fine positioning members 19, effectively improving the clamping accuracy of the moving mold core 114 and the fixed mold core 123, and thus ensuring the injection molding quality of the injection molded product in the mold cavity 19b.

[0072] Please continue to refer to Figure 2 and Figure 4, in some other preferred embodiments, the ejection mechanism 14 includes a top plate 141, a plurality of reset guide rods 142 and a plurality of reset springs 143; the top plate 141 is used to externally connect to the ejector rod of the injection molding machine; one ends of the plurality of reset guide rods 142 are all connected to the top plate 141, and the other ends of the plurality of reset guide rods 142 are all slidably connected to the moving mold 11; the reset springs 143 are sleeved on the reset guide rods 142, one ends of the plurality of reset springs 143 are connected to the top plate 141, and the other ends of the plurality of reset springs 143 are connected to the moving mold 11; wherein, one end face of the top plate 141 close to the fixed mold 12 is connected to the cutting tool 15.

[0073] It can be understood that the ejection mechanism 14 drives the cutting tool 15 to cut off the sprue material under the ejection action of the ejector rod of the injection molding machine. Specifically, the ejector rod of the injection molding machine pushes the top plate 141, and the top plate 141 is slidably connected to the moving mold 11 through a plurality of connected reset guide rods 142, so that the top plate 141 moves on the moving mold 11, and then drives the cutting tool 15 connected to the top plate 141 to cut the sprue material; when the ejector rod of the injection molding machine is not ejected, one end face of the top plate 141 away from the fixed mold 12 abuts against the moving mold 11; by setting the top plate 141 and a plurality of reset guide rods 142, the guiding action of the plurality of reset guide rods 142 ensures the stable movement of the top plate 141, providing an effective guarantee for the top plate 141 to drive the cutting tool 15 to cut off the sprue material; through the reset springs 143 sleeved on the plurality of reset guide rods 142, after the top plate 141 drives the cutting tool 15 to cut off the sprue material and the ejector rod of the injection molding machine no longer ejects, the elastic action of the reset springs 143 pushes the top plate 141 to return to its original position, so that the top plate 141 drives the cutting tool 15 back to the position before cutting, ensuring the smooth progress of the next cutting action, and at the same time ensuring that the cutting tool 15 does not block the flow of the injection melt between the sprue 131 and the mold cavity 19b, providing an effective guarantee for the next injection molding.

[0074] Please continue to refer to Figure 2 and Figure 4 , in some preferred embodiments, the top plate 141 is arranged between the moving mold fixing plate 111 and the moving template 113, and the top surface of the top plate 141 in the height direction abuts against the moving mold fixing plate 111, the bottom surface of the top plate 141 in the height direction is connected to one end of the cutting tool 15, and the other end of the cutting tool 15 is slidably connected to the moving template 113 and the sprue plate 13; by setting the top plate 141 and the cutting tool 15, it provides an effective guarantee for the in-mold cutting without opening the injection mold, so that the cutting tool 15 can cut off the sprue material when the injection product has not completely cooled and hardened after the pressure holding is over, thereby effectively eliminating the break marks on the injection product after cutting off the sprue material and effectively reducing the subsequent processing difficulty.

[0075] Please continue to refer to Figure 4 Figure 4 , in some preferred embodiments, the moving mold fixing plate 111 and the moving template 113 are slidably connected to the top plate 141 through a plurality of sliding guide rods 144. One ends of the plurality of sliding guide rods 144 are all connected to the moving mold fixing plate 111, and the other ends of the plurality of sliding guide rods 144 are all connected to the moving template 113. A plurality of sliding sleeves 145 are correspondingly arranged on the ejecting mechanism 14. The top plate 141 includes an upper top plate 1411 and a lower top plate 1412 which are connected in sequence. The plurality of sliding sleeves 145 are arranged at the connecting position of the upper top plate 1411 and the lower top plate 1412. The sliding sleeves 145 are slidably connected to the sliding guide rods 144. By arranging a plurality of sliding guide rods 144 and a plurality of sliding sleeves 145, the stability of the top plate 141 driving the cutting tool 15 to cut the sprue material is further improved, providing an effective guarantee for effectively eliminating the breaking marks presented on the injection molded product after cutting the sprue material.

[0076] Please continue to refer to in combination with Figure 5 and Figure 6 Figure 6 , in some other preferred embodiments, the ejecting mechanism 14 further includes a cutter fixing plate 146. The cutter fixing plate 146 is arranged on one end face of the top plate 141 close to the fixed mold 12. A plurality of cutter fixing holes 1461 with steps are formed on the cutter fixing plate 146. The first cutter 151 and the second cutter 152 both further include a hook portion 156. The hook portion 156 is connected to one end of the cutter body 153 close to the top plate 141. The cutter body 153 is arranged in the cutter fixing hole 1461, and the hook portion 156 is located on the step of the cutter fixing hole 1461.

[0077] It can be understood that the hook portion 156 is connected to the cutter body 153 in an "L" shape. By arranging the cutter fixing holes 1461 on the cutter fixing plate 146 and arranging the hook portions 156 on the first cutter 151 and the second cutter 152, it is convenient to install and replace the cutting tool 15, improving the convenience of use and maintenance of the injection mold.

[0078] Please continue to refer to Figure 6 Figure 6 , in some other preferred embodiments, the ejecting mechanism 14 further includes a ejector pin 147. One end of the ejector pin 147 is connected to the top plate 141, and the other end of the ejector pin 147 is arranged opposite to the sprue 131 and sequentially penetrates through the moving mold 11 and the sprue plate 13.

[0079] It can be understood that the ejector pin 147 is disposed between the first cutting knife 151 and the second cutting knife. One end of the ejector pin 147 is connected to the top plate 141, and the other end of the ejector pin 147 communicates with the sprue 131. Specifically, when the ejecting mechanism 14 does not eject, and when the ejecting mechanism 14 drives the cutting tool 15 to cut the sprue material, the ejector pin 147 does not extend into the sprue 131. Only after the fixed mold 12 and the moving mold 11 are opened, the ejecting mechanism 14 ejects again. The ejector pin 147 is used to eject the sprue material from the sprue 131 after the fixed mold 12 and the moving mold 11 are opened. By providing the ejector pin 147, the automatic removal of the sprue material after mold opening is ensured, so that the ejecting mechanism 14 realizes the in-mold automatic cutting of the sprue material and the automatic removal of the sprue material after mold opening, effectively improving the automation level of the injection mold, and thus effectively eliminating the operation difficulty of manually cutting the sprue material and improving the production efficiency.

[0080] Please refer to Figure 8 , in the second embodiment of the present invention, a method for using the in-mold cutting injection mold 10 as described in the above embodiment is further provided, which specifically includes the following steps:

[0081] S100. After the injection molding and holding pressure are completed and cooled for the first predetermined time, the ejector rod of the injection molding machine ejects for the first time, and the ejecting mechanism 14 drives the cutting tool 15 to cut the sprue material to obtain an injection molded product separated from the sprue material.

[0082] It can be understood that through the first ejection of the ejector rod of the injection molding machine, the in-mold cutting of the sprue material is realized when the injection mold is not opened, so that the cutting tool 15 cuts the sprue material when the injection molded product is not completely cooled and hardened, effectively eliminating the break marks on the injection molded product where the sprue material is cut, and thus effectively reducing the subsequent processing difficulty. It should be noted that the first ejection of the ejector rod of the injection molding machine is carried out when the injection molded product has a certain hardness after the injection molding and holding pressure are completed. At this time, the injection mold is not opened, and the injection molded product has been shaped but not completely hardened, which is convenient for cutting the sprue material on the injection molded product. The timing of the first ejection of the ejector rod of the injection molding machine is determined according to the cooling condition of the injection melt and can be adjusted according to the actual production situation. If the injection molded product has been shaped and has a certain hardness after the holding pressure is completed, the first ejection can be carried out after the holding pressure is completed. If the injection molded product needs to be cooled for the first predetermined time after the holding pressure is completed before it is shaped and has a certain hardness, the first ejection can be carried out after cooling for the first predetermined time. Here, the first predetermined time refers to the time from the end of the holding pressure until the injection melt cools and solidifies in the mold cavity 19b and the sprue 131 and has a certain hardness. The specific setting of the first predetermined time is determined according to the cooling condition of the injection melt, which belongs to the cooling characteristics of the injection melt itself and will not be elaborated here.

[0083] Please continue to refer to Figure 7, in some preferred embodiments, the feed distance H of the cutting tool 15 is 0.10 - 0.15 mm. The feed distance refers to the distance between the end face of the cutting edges 1551 of the first cutting blade 151 and the second cutting blade 152, which is away from the cutting tool body 153, and the top surface of the fixed mold 12. At this time, the cutting edge body 1551 and the fixed mold 12 complete a sequential shearing action to realize the cutting of the sprue material connected to the injection molded product. By setting the feed distance, it effectively guarantees that the cutting tool 15 can cut the sprue material connected to the injection molded product.

[0084] S200. Continue to cool the sprue material and the injection molded product. After cooling for a second predetermined time, open the mold between the fixed mold 12 and the movable mold 11, and the ejector rod of the injection molding machine ejects for the second time. The top plate 141 drives the ejector pin 147 to eject the sprue material from the sprue 131.

[0085] It can be understood that the second predetermined time refers to the time from the end of the pressure holding to the time when the injection molded product and the sprue material can be taken out. The second ejection of the ejector rod of the injection molding machine is carried out after the movable mold 11 and the fixed mold 12 are completely opened. The ejector rod of the injection molding machine pushes the top plate 141 to move, and the top plate 141 drives the ejector pin 147 to extend into the sprue 131 to eject the sprue material from the sprue 131. By the second ejection of the ejector rod of the injection molding machine, the sprue material is separated from the sprue 131, ensuring the complete separation of the sprue material and the injection molded product, and at the same time providing a guarantee for the smooth progress of the next injection molding.

[0086] S300. Take out the injection molded product.

[0087] It can be understood that taking out the injection molded product completes the entire injection molding process of the injection mold. The injection molded product can be sucked and removed from the injection mold by a manipulator.

[0088] In summary, the present invention provides an in-mold cutting injection mold and a method for using the same. The in-mold cutting injection mold includes a fixed mold and a movable mold. The movable mold is connected to the fixed mold to form a mold cavity. The in-mold cutting injection mold further includes: a sprue plate, which is disposed on the movable mold and has a sprue communicating with the mold cavity; an ejection mechanism, which is movably disposed on the movable mold; a cutting tool, one end of which is connected to the ejection mechanism, and the other end of which is located at the connection position between the sprue plate and the mold cavity. The cutting tool cuts the sprue material at the connection position between the sprue plate and the mold cavity under the drive of the ejection mechanism. It can be understood that by providing the sprue plate, the sprue, the cutting tool, and the mold cavity form a pouring channel, which provides a guarantee for the injection mold to inject and form an injection product; by providing the ejection mechanism and movably disposing the ejection mechanism on the movable mold, the ejection mechanism can move after the movable mold and the fixed mold are closed, and then drive the cutting tool to perform a cutting action, which provides a guarantee for realizing in-mold cutting of the sprue material; by providing the cutting tool at the connection position between the sprue plate and the mold cavity, the cutting tool can automatically cut the sprue material connected to the injection product in the mold under the drive of the ejection mechanism, effectively eliminating the operation difficulty of manually cutting the sprue material and improving the production efficiency. At the same time, the cutting tool can cut the sprue material when the injection product is not completely cooled and hardened after the pressure holding is completed, thereby effectively eliminating the break marks on the injection product after cutting the sprue material and effectively reducing the subsequent processing difficulty.

[0089] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or changes can be made according to the above description. All such improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims

1. An in-mold cutting injection mold, comprising a fixed mold and a movable mold, wherein the movable mold is connected to the fixed mold to form a mold cavity, and is characterized in that, The in-mold cutting injection mold also includes: A nozzle plate, the nozzle plate is arranged on the movable mold, and a nozzle communicating with the mold cavity is arranged on the nozzle plate; An ejection mechanism, the ejection mechanism being movably disposed on the movable mold; A cutting tool, one end of which is connected to the ejection mechanism, and the other end of which is located at the junction of the gate plate and the mold cavity, and the cutting tool is driven by the ejection mechanism to cut the gate material at the junction of the gate plate and the mold cavity; A plurality of first precision positioning parts, wherein the plurality of first precision positioning parts are arranged on the movable mold; A plurality of second precision positioning members, wherein the plurality of second precision positioning members are arranged on the fixed mold corresponding to the plurality of first precision positioning members, and the plurality of second precision positioning members are arranged in coordination with the plurality of first precision positioning members; The in-mold cutting injection mold also includes: A nozzle plate, wherein the nozzle plate is arranged on the fixed mold and is provided with a glue injection hole communicating with the water inlet; The cutting tool comprises a first cutting knife and a second cutting knife which are symmetrically arranged; the first cutting knife and the second cutting knife both comprise: Cutter body; A cutter orientation column, the cutter orientation column is connected to an end of the cutter body away from the ejection mechanism; Wherein, guide grooves are provided on both sides of the nozzle plate in the width direction, the guide grooves are provided in the height direction, and the cutter directional column is inserted into the guide grooves; An end of the cutter directional column away from the cutter body is provided with a directional column guide cone, and the thickness of the directional column guide cone gradually decreases in a direction away from the cutter body; The first cutter and the second cutter both further include: The blade portion is connected to the cutter body, the blade portion is located at the connecting position of the mold cavity and the water inlet, and the two ends of the blade portion along the length direction are respectively connected to two of the cutter directional columns.

2. The in-mold cutting injection mold according to claim 1, wherein, The blade portion comprises: Blade body; An avoidance groove, the avoidance groove is located on a side of the blade body facing the water outlet, and the avoidance groove is concave inwardly along a height direction; Among them, one end face of the blade body facing away from the water inlet abuts against the mold cavity, and one end face of the blade body facing away from the cutter body is arranged parallel to the top surface of the fixed mold and connected to the groove wall of the avoidance groove.

3. The in-mold cutting injection mold according to claim 2, characterized in that: The nozzle plate is provided with an avoidance slope at a position corresponding to the blade portion, and both ends of the avoidance slope along the length direction are respectively connected to the two guide grooves, and the bottom of the avoidance slope is lower than the top surface of the fixed mold along the height direction.

4. The in-mold cutting injection mold according to claim 1, wherein The ejection mechanism comprises: A top plate, the top plate is used for connecting to an ejector rod of an injection molding machine; A plurality of reset guide rods, one end of each of the reset guide rods is connected to the top plate, and the other end of each of the reset guide rods is slidably connected to the movable mold; A plurality of return springs, wherein the return springs are sleeved on the return guide rod, one end of the plurality of return springs is connected to the top plate, and the other end of the plurality of return springs is connected to the movable mold; Wherein, an end surface of the top plate close to the fixed mold is connected to the cutting tool.

5. The in-mold cutting injection mold according to claim 4, characterized in that, The ejection mechanism further includes: A ejector pin, one end of the ejector pin is connected to the top plate, the other end of the ejector pin is disposed opposite to the gate, and sequentially penetrates through the moving mold and the sprue plate.

6. A method for using an in-mold cutting injection mold as described in claim 5, characterized in that, It includes the following steps: After the injection molding and holding pressure are completed and cooled for the first predetermined time, the ejector rod of the injection molding machine ejects for the first time, and the ejection mechanism drives the cutting tool to cut off the sprue material to obtain an injection molded product separated from the sprue material; Continue to cool the sprue material and the injection molded product. After cooling for the second predetermined time, the fixed mold and the moving mold are opened, the ejector rod of the injection molding machine ejects for the second time, and the top plate drives the ejector pin to eject the sprue material from the gate; Take out the injection molded product.

Images