Injection molding mold with middle feeding function

Abstract

The utility model discloses a middle feeding injection mold which comprises an upper mold and a lower mold, an upper mold core is arranged on the upper mold, a lower mold core is arranged on the lower mold, a bottom mold is arranged at the bottom of the lower mold core, a base is arranged in the middle of the bottom mold, and a cavity is formed by enclosing the upper mold core, the lower mold core, the bottom mold and the base. A sprue is arranged in the middle of the upper mold core, an ejector pin is arranged in the middle of the sprue and sleeved with a connecting piece located at the bottom of the sprue, a first annular slope is arranged on the inner wall of the bottom of the sprue, and a second annular slope is arranged at the position, corresponding to the lower portion of the first annular slope, of the upper end of the connecting piece. And an annular pouring gate for connecting the pouring gate and the cavity is formed between the first annular inclined surface and the second annular inclined surface. The utility model has the characteristics that the exhaust passage can be prevented from being blocked, the gas residue can be avoided, the gas in the cavity can be smoothly and stably exhausted, the conditions of air holes, scorching, material shortage and the like during product molding are avoided, and the product molding quality is ensured.

Description

Technical Field

[0001] This utility model relates to an injection molding mold, specifically an injection molding mold with intermediate feeding. Background Technology

[0002] In existing technologies, some molding materials are thermosetting materials. Typically, in injection molding molds, the gate is located on the side parting surface of the mold. Thermosetting materials are fed from the side of the product. During injection molding, the material first flows towards the parting surface and seeps into it, and then slowly pushes towards the bottom of the mold cavity. The venting channel is usually located at the parting surface. Since thermosetting materials are overflowing materials, there is a discharge phenomenon during venting. As a result, the venting channel is blocked by material, making it difficult for air to escape. This leads to problems such as air holes, scorching, and material shortages during product molding.

[0003] Meanwhile, thermosetting materials are composite materials that are in clumps. When they are filled into the mold cavity, they are difficult to fill completely when directly entering the cavity from the gate. This results in the inability to completely expel the gas in the cavity, leading to some gas residue. This can cause problems such as air holes, scorching, and material shortages after the product is molded, thus affecting the quality of the product. Utility Model Content

[0004] The purpose of this invention is to provide an injection molding die with intermediate feeding, which solves the problems of poor gas discharge and failure of leveling molding in the prior art.

[0005] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: an injection molding mold with intermediate feeding, including an upper mold and a lower mold, wherein the upper mold is provided with an upper mold core, the lower mold is provided with a lower mold core that cooperates with the upper mold core, the bottom of the lower mold core is provided with a bottom mold, the bottom mold is provided with a base in the middle, the upper mold core, the lower mold core, the bottom mold and the base are mutually enclosed to form a cavity, the upper mold core is provided with a gate in the middle of the cavity that communicates with the cavity and is located in the middle of the cavity, the gate is provided with an ejector pin that passes downward through the cavity, the ejector pin is fitted with a connector located at the bottom of the gate, the bottom inner wall of the gate is provided with a first annular inclined surface, the upper end of the connector is provided with a second annular inclined surface below the first annular inclined surface, and an annular runner connecting the gate and the cavity is formed between the first annular inclined surface and the second annular inclined surface.

[0006] As a further preferred technical solution of this utility model, the upper end of the ejector pin extends to the inner side of the gate to form a material pulling section, and the side wall of the material pulling section is arranged in a wave-like undulation from top to bottom.

[0007] As a further preferred technical solution of this utility model, a vertically movable ejector sleeve is provided in the middle of the cavity and is coaxially arranged with the gate. The lower end of the connector abuts against the upper end of the ejector sleeve, and the connector can be pushed upward by the ejector sleeve.

[0008] As a further preferred technical solution of this utility model; a fixing post is provided in the middle of the base, and a fixing cylinder is provided at the upper end of the fixing post, which is located in the middle of the cavity and connected to the lower end of the connector. The ejector sleeve and the ejector pin are both inserted through the middle of the fixing post and the fixing cylinder.

[0009] As a further preferred technical solution of this utility model, the lower end of the connector is provided with a connecting section located inside the fixed cylinder, the outer wall of the connecting section abuts against the inner wall of the fixed cylinder, and the bottom end of the connecting section can abut against the upper end of the sleeve.

[0010] As a further preferred technical solution of this utility model; a movable plate that can move up and down is provided below the lower mold, the ejector sleeve is connected to the movable plate, a base plate is provided below the movable plate, and the lower end of the ejector pin is fixedly connected to the base plate.

[0011] Therefore, this utility model has the advantages of avoiding blockage of the exhaust channel, avoiding gas residue, smooth and stable discharge of gas in the mold cavity, avoiding air holes, scorching, material shortage and other problems in product molding, and ensuring product molding quality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 yes Figure 1 A schematic diagram of the local structure in the image. Detailed Implementation

[0014] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0015] like Figure 1-2As shown, an injection molding die with intermediate feeding includes an upper mold 1 and a lower mold 2. The upper mold 1 has an upper mold core 11, and the lower mold 2 has a lower mold core 21 that mates with the upper mold core 11. The bottom of the lower mold core 21 has a bottom mold 3, and the bottom mold 3 has a base 4 in the middle. The upper mold core 11, lower mold core 21, bottom mold 3, and base 4 surround each other to form a cavity 10, which is an injection molding cavity. The upper mold core 11 can be moved up and down by the upper mold 1 to realize the mold opening and closing action. The upper mold core 11 has a gate 111 in the middle that communicates with the cavity 10. The gate 111 is located on the upper side of the middle of the cavity 10, and the material enters from the gate 111 from top to bottom. Injection molding is performed within the cavity 10, allowing the material to flow and accumulate from the bottom of the cavity 10, thus expelling the gas at the bottom of the cavity 10. As the material is gradually fed in, it gradually fills the cavity 10 from bottom to top. During the filling process, the gas inside the cavity 10 is expelled. Before the material fills from the bottom of the cavity 10 to the parting surface, the gas at the bottom of the cavity 10 can be discharged from the venting channel at the parting surface or the upper gate 111, thus avoiding residual gas at the bottom of the cavity 10 that could affect the molding quality of the product. At the parting surface and above the parting surface, as the material gradually fills, the gas can be directly discharged from the gate 111. The venting effectively achieves stable and sufficient venting of the cavity 10, while ensuring sufficient material filling. The bottom inner wall of the gate 111 is provided with a first annular inclined surface 112. The upper end of the connector 53 is provided with a second annular inclined surface 531 corresponding to the lower part of the first annular inclined surface 112. A gating system 101 connecting the gate 111 and the cavity 10 is formed between the first annular inclined surface 112 and the second annular inclined surface 531. The first annular inclined surface 112 and the second annular inclined surface 531 are close to each other to form the annular gating system 101. The annular gating system 101 has a small flow channel and is arranged around the connector 53, allowing the material entering the gate 111 to flow from the first annular inclined surface to the second annular inclined surface 53. At the annular runner 101, the material is diverted, reducing the flow rate of the material entering the cavity 10. This prevents the material from entering the bottom of the cavity 10 in a large, clump-like manner, which would cause some gas to be directly covered and unable to escape. Furthermore, the material flows into the bottom of the cavity 10 in an annular pattern, making the flow more uniform and the feeding slower. This improves the venting effect of the cavity, preventing issues such as air holes, scorching, and material shortages in the product molding process, thereby improving the product molding quality. At the same time, it forms an easily detachable connection after molding, facilitating the quick separation of the product from the solidified portion within the runner 101 for further processing and molding of the product.

[0016] like Figure 1-2As shown, a vertically movable ejector sleeve 51, coaxially arranged with the gate 111, is inserted through the middle of the cavity 10. The lower end of the connector 53 abuts against the upper end of the ejector sleeve 51. The connector 53 can be pushed upward by the ejector sleeve 51. An ejector pin 52, coaxially arranged with its upper end located inside the gate 111, is inserted through the ejector sleeve 51. The ejector sleeve 51 is sleeved on the ejector pin 52, which is fixed. The ejector sleeve 51 can move axially relative to the ejector pin 52. Material enters from the gate 111 and enters the cavity 10 for molding. After the product is molded, it is molded and connected to the upper end of the ejector pin 52. A connector 53, located between the gate 111 and the cavity 10, is sleeved on the ejector pin 52. The lower end of the connector 53 abuts against the upper end of the ejector sleeve 51. After the product solidifies, the upper mold 1... When the upper mold moves upward, since the product is molded together with the upper end of the ejector pin 52, it can be directly separated from the product when the upper mold 1 moves upward, avoiding the product from falling and damaging the product. The upper mold can then control the ejector sleeve 51 to move upward, pushing the connecting piece 53. The top of the connecting piece 53 pushes the product, so that the product is separated from the inserts such as the lower mold core 21 and ejector pin 52 used to form the cavity 10, so as to facilitate quick demolding and material unloading. The setting of the connecting piece 53 not only isolates the ejector sleeve 51 and ejector pin 52 from the material, avoiding the trouble of cleaning, but also serves as a part of the inserts that make up the cavity 10, and can push the product, so that some of the solidified material in the sprue 101 can be quickly separated from the ejector pin, and the product can be quickly demolded.

[0017] like Figure 2 As shown, the upper end of the ejector pin 52 extends to the inner side of the gate 111 to form a pull section 521. The side wall of the pull section 521 is undulating from top to bottom. The pull section 521 located in the gate 111 is in contact with the material inside the gate 111. When the material solidifies, it is molded and connected with the pull section 521. When the mold is opened, the pull section 521 can pull the molded product, so that the upper mold 1 and the upper mold core 11 are separated from the product, preventing the product from being pulled upward by the upper mold. The undulating side wall of the pull section 521 from top to bottom can increase the axial limit of the pull section 521 on the product and strengthen the pulling force of the pull section 521 on the product, preventing the product from slipping off the zipper section 521.

[0018] like Figure 1-2As shown, a fixed post 41 is provided in the middle of the base 4. A fixed cylinder 42 is provided at the upper end of the fixed post 41, located in the middle of the cavity 10 and connected to the lower end of the connector 53. The fixed post 41 and the fixed cylinder 42 are coaxially connected. The side wall of the fixed post 41 and the connector 53 cooperate to form the middle part of the cavity 10, and at the same time, it positions and guides the ejector sleeve 51 and the ejector pin 52, and isolates the ejector sleeve 51 and the ejector pin 52 from contact with the material to avoid contamination and increase the difficulty of cleaning. The ejector sleeve 51 and the ejector pin 52 are both inserted in the middle of the fixed post 41 and the fixed cylinder 42. The lower end of the connector 53 is provided with a connecting section 532 located in the fixed cylinder 42. The outer wall of the connecting section 532 abuts against the inner wall of the fixed cylinder 42. The bottom end of the connecting section 532 can abut against the upper end of the ejector sleeve 51. A movable plate 61 that can move up and down is provided below the lower mold 2. The ejector sleeve 51 is connected to the movable plate 61. A base plate is provided below the movable plate 61. 7. The lower end of the ejector pin 52 is fixedly connected to the base plate 7. The lower end of the ejector pin 52 passes through the movable plate 61 and is fixed to the top surface of the base plate 7. The ejector sleeve 51 is fixed to the top surface of the movable plate 61. The side of the movable plate 61 is connected to the servo motor through a screw structure or to the output rod of the cylinder, so that the movable plate 61 can drive the ejector sleeve 51 to move up and down relative to the ejector pin 52. When the movable plate 61 moves up, it can drive the ejector sleeve 51 to move up. The upper end of the ejector sleeve 51 can then push the connecting section 532 at the lower end of the connector 53, so that the connector 53 is pushed up. When the connector 53 is pushed up, the second annular inclined surface 531 at the upper end of the connector 53 can push the product, so that the product moves up and separates from the lower mold core 21 and other inserts. The product components located in the gate 111 are separated from the pulling section 521, thereby realizing the demolding of the product.

[0019] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. An injection molding die with intermediate feeding, comprising an upper die (1) and a lower die (2), wherein the upper die (1) is provided with an upper die core (11) and the lower die (2) is provided with a lower die core (21) that cooperates with the upper die core (11), characterized in that: The lower mold core (21) has a bottom mold (3) at its bottom, and a base (4) is provided in the middle of the bottom mold (3). The upper mold core (11), lower mold core (21), bottom mold (3) and base (4) enclose each other to form a cavity (10). The upper mold core (11) has a gate (111) in the middle of the cavity (10) that communicates with the cavity (10) and is located in the middle of the cavity (10). The gate (111) has an ejector pin (52) that passes downward through the cavity (10) in the middle. A connector (53) is fitted on the ejector pin (52) at the bottom of the gate (111). The inner wall of the bottom of the gate (111) is provided with a first annular inclined surface (112). The upper end of the connector (53) is provided with a second annular inclined surface (531) below the first annular inclined surface (112). An annular runner (101) connecting the gate (111) and the cavity (10) is formed between the first annular inclined surface (112) and the second annular inclined surface (531).

2. The injection molding die with intermediate feeding according to claim 1, characterized in that: The upper end of the ejector pin (52) extends to the inside of the gate (111) to form a material pulling section (521), and the side wall of the material pulling section (521) is arranged in a wave-like undulation from top to bottom.

3. The injection molding die with intermediate feeding according to claim 1, characterized in that: A sleeve (51) that can move vertically and is coaxial with the gate (111) is provided in the middle of the cavity (10). The lower end of the connector (53) abuts against the upper end of the sleeve (51). The connector (53) can be pushed up by the sleeve (51).

4. The injection molding die with intermediate feeding according to claim 3, characterized in that: The base (4) is provided with a fixing post (41) in the middle. The upper end of the fixing post (41) is provided with a fixing cylinder (42) located in the middle of the cavity (10) and connected to the lower end of the connector (53). The ejector sleeve (51) and the ejector pin (52) are both inserted in the middle of the fixing post (41) and the fixing cylinder (42).

5. The injection molding die with intermediate feeding according to claim 4, characterized in that: The lower end of the connector (53) is provided with a connecting section (532) located inside the fixed cylinder (42). The outer wall of the connecting section (532) abuts against the inner wall of the fixed cylinder (42), and the bottom end of the connecting section (532) abuts against the upper end of the sleeve (51).

6. The injection molding die with intermediate feeding according to claim 3, characterized in that: The lower mold (2) is provided with a movable plate (61) that can move up and down. The ejector sleeve (51) is connected to the movable plate (61). The movable plate (61) is provided with a base plate (7) below it. The lower end of the ejector pin (52) is fixedly connected to the base plate (7).

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