Injection mold with insert retreating structure

Abstract

The utility model discloses an injection mold with an insert retreating structure. The injection mold comprises an upper mold base, a static mold plate, a movable mold plate, a lower mold base, an upper mold core, a lower mold core, an ejector rod assembly, an insert cylinder and an insert ejector rod. The upper mold core and the lower mold core are arranged between the static mold plate and the movable mold plate to form a mold cavity, a top forming head of the insert cylinder is matched with a product deep cavity, the bottom of the insert cylinder is rigidly connected with the lower mold base through the fixing plate, a through ejection hole is formed in the insert cylinder, one end of the insert ejection rod is connected with the ejection movable plate, and the other end of the insert ejection rod penetrates through the ejection hole and the fixing plate. According to the mold, the insert column body is fixedly connected with the fixing plate, the insert column body is separated from a deep cavity of a product to release the holding force during mold splitting, and then the product is ejected out through cooperation of the ejector rod assembly and the insert ejector rod, so that the problem of product deformation caused by the holding force during demolding of the deep-cavity product is solved, the appearance quality and the size precision of the product are improved, and the defective rate is reduced; meanwhile, demolding is more stable and smoother, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold with an insert retraction structure. Background Technology

[0002] In the field of injection molding, inserts are often required in the mold to form the deep cavity shape of products when injection molding products with deep cavity structures. However, the deep cavity structure significantly increases the contact area between the insert and the inner wall of the product, resulting in excessively strong clamping forces between them.

[0003] In existing technologies, ejector pin assemblies are typically used alone for product ejection and demolding. However, during the demolding process of deep-cavity products after injection molding, the excessive clamping force between the inserts and the product's inner wall can easily cause dents or deformation due to uneven local stress when the product is ejected using only external ejector pins. This severely affects the product's appearance quality and dimensional accuracy, increases the defect rate, and reduces production efficiency. Therefore, there is an urgent need for an injection mold structure that can effectively solve the problem of product deformation caused by clamping force during demolding of deep-cavity products. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an injection mold with an insert retraction structure.

[0005] The technical solution adopted by this utility model is: an injection mold with an insert retraction structure, including an upper mold base, a stationary mold plate, a moving mold plate, a lower mold base, an upper mold core, a lower mold core, and an ejector pin assembly. The upper mold core and the lower mold core are disposed between the stationary mold plate and the moving mold plate, and a mold cavity for molding products is provided between the stationary mold plate and the moving mold plate. The ejector pin assembly includes an ejector plate and an ejector pin connected to the ejector plate, and also includes an insert column and an insert ejector pin. The top of the insert column is provided with a molding head that matches the shape of the deep cavity of the product, and the bottom of the insert column is rigidly connected to the lower mold base through a fixing plate.

[0006] The insert column has a through ejector hole inside. One end of the insert ejector rod is connected to the ejector plate, and the other end can slide through the fixed plate and the ejector hole.

[0007] Furthermore, the insert column includes an upper insert and a lower insert, and the ends of the upper insert and the lower insert that are connected to each other are provided with a fitting structure. The fitting structure includes a fitting groove at the end, fitting protrusions at the upper and lower ends of the fitting groove, and fitting notches at the left and right ends of the fitting groove.

[0008] Furthermore, the fixing plate is provided with a positioning groove for the lower insert to be embedded and installed.

[0009] Furthermore, the bottom wall of the positioning groove, the upper insert, and the lower insert are provided with long bolt holes. After the upper insert and the lower insert are embedded in the positioning groove, the fixing plate, the upper insert, and the lower insert are fixedly connected by long bolts.

[0010] Furthermore, there are at least four ejector holes, which are evenly distributed around the center of the insert post.

[0011] Furthermore, there are multiple push rod assemblies, which are evenly distributed around the center of the insert post on the outer ring of the insert push rod.

[0012] The beneficial effects of this utility model are:

[0013] First, by rigidly connecting the insert column to the fixed plate of the lower mold base, the insert body can separate from the deep cavity of the product along with the fixed plate during mold parting, releasing the excessive clamping force between the insert and the inner wall of the product in advance. This effectively avoids the problem of dents or deformation caused by uneven local force when the product is ejected by external ejector pins alone, greatly improving the appearance quality and dimensional accuracy of the product and reducing the defect rate.

[0014] Secondly, a through ejector hole is set inside the insert pillar, and the insert ejector rod and ejector rod assembly work together to improve the uniformity of demolding force, making the product demolding process more stable and smooth, and avoiding the problem of product deformation due to uneven ejection force of the ejector rod.

[0015] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0018] Figure 3 This is a structural schematic diagram of the insert column.

[0019] Figure 4 This is a schematic diagram showing the separation of the insert column.

[0020] Figure 5 This is a structural diagram of the fixed plate and insert column.

[0021] Figure 6 This is a schematic diagram of the bottom of the fixing plate.

[0022] Figure 7 This is a structural diagram of the fixed plate.

[0023] Figure 8 This is a structural diagram of the finished product. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] This utility model provides an injection mold with an insert retraction structure.

[0027] In this embodiment, refer to Figure 1-8 The injection mold with insert retraction structure includes an upper mold base 1, a stationary mold plate 2, a moving mold plate 3, a lower mold base 4, an upper mold core 5, a lower mold core 6, and an ejector pin assembly 7. The upper mold core and the lower mold core are disposed between the stationary mold plate and the moving mold plate, and a mold cavity 9 for molding a product 8 is provided between the stationary mold plate and the moving mold plate. The ejector pin assembly includes an ejector plate 10 and an ejector pin 11 connected to the ejector plate 10, and also includes an insert pillar 12 and an insert ejector pin 13. The top of the insert pillar 11 is provided with a molding head 14 that matches the shape of the product cavity 25, and the bottom of the insert pillar is rigidly connected to the lower mold base through a fixing plate 15.

[0028] The insert column has a through ejector hole inside. One end of the insert ejector rod is connected to the ejector plate, and the other end can slide through the fixed plate 15 and the ejector hole 16.

[0029] In the above technical solution, the molding head at the top of the insert pillar matches the shape of the product's deep cavity, used to mold the product's deep cavity structure 25. The bottom of the insert pillar is rigidly connected to the lower mold base via a fixing plate, allowing the insert pillar to separate from the product's deep cavity along with the fixing plate when the mold opens, releasing the clamping force between the insert and the product's inner wall in advance. The ejection hole through the insert pillar, in conjunction with the insert ejector rod, allows the insert ejector rod and ejector rod assembly to work together to smoothly eject the product after the insert body separates. This step-by-step demolding method changes the traditional mode of relying solely on external ejector rods to eject the product.

[0030] It effectively solves the problem of uneven stress on deep cavity products during demolding, which can cause dents or deformation due to excessive clamping force between the insert and the inner wall. This improves the molding quality of the products. The step-by-step demolding method makes the demolding process more stable, improves production efficiency, and reduces the defect rate.

[0031] Specifically, the insert column includes an upper insert 17 and a lower insert 18. The ends of the upper insert and the lower insert that are connected to each other are provided with a fitting structure. The fitting structure includes a fitting groove 19 at the end, fitting protrusions 20 at the upper and lower ends of the fitting groove 19, and fitting notches 21 at the left and right ends of the fitting groove.

[0032] In this embodiment, the insert column is split into an upper insert and a lower insert, which are connected by a fitting structure. The split insert column reduces the processing difficulty and the precision requirements of the insert.

[0033] Specifically, the fixing plate is provided with a positioning groove 22 for the lower insert to be embedded and installed.

[0034] In this embodiment, the positioning groove on the fixed plate provides precise installation positioning for the lower insert, ensuring the accurate position of the lower insert on the fixed plate, thereby guaranteeing the positional accuracy of the entire insert column in the mold. Precise positioning is the foundation for ensuring the dimensional accuracy of the product's deep cavity molding, avoiding the product's deep cavity shape from not meeting requirements due to insert position deviations.

[0035] Specifically, the bottom wall of the positioning groove, the upper insert and the lower insert are provided with long bolt holes 23. After the upper insert and the lower insert are inserted into the positioning groove, the fixing plate, the upper insert and the lower insert are fixedly connected by long bolts 34.

[0036] In this embodiment, the long bolt holes on the bottom wall of the positioning groove, the upper insert, and the lower insert, together with the long bolts, firmly connect the fixing plate, the upper insert, and the lower insert into a whole. This connection method ensures the rigid connection strength between the insert column and the fixing plate, so that the insert column will not loosen during injection molding and demolding, and ensures that the insert column can reliably follow the fixing plate to separate from the deep cavity of the product.

[0037] Specifically, there are at least four ejector holes, which are evenly distributed around the center of the insert post.

[0038] In this embodiment, at least four ejector holes are provided and evenly distributed around the center of the insert post. This design ensures that the ejector rod exerts a uniform ejection force on the product. When the product is ejected by the insert rod, deformation due to uneven force can be avoided. At the same time, multiple ejector holes also improve the stability and reliability of the ejection process.

[0039] Specifically, there are multiple push rod assemblies, which are evenly distributed around the center of the insert post on the outer ring of the insert push rod.

[0040] In this embodiment, multiple ejector pin assemblies are evenly distributed around the center of the insert pin, forming a circle around the outer ring of the insert pin. Working in conjunction with the insert pin, they further increase the ejection contact area and ejection force on the product. During product demolding, this provides a more uniform and sufficient ejection force, ensuring smooth demolding, while also sharing the ejection pressure and reducing the stress on individual ejector pins or insert pins.

[0041] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. An injection mold with an insert retraction structure, comprising an upper mold base, a stationary mold plate, a movable mold plate, a lower mold base, an upper mold core, a lower mold core, and an ejector pin assembly, wherein the upper mold core and the lower mold core are disposed between the stationary mold plate and the movable mold plate, and a mold cavity for molding a product is formed between the stationary mold plate and the movable mold plate, and the ejector pin assembly comprises an ejector plate and an ejector pin connected to the ejector plate, characterized in that: It also includes an insert pillar and an insert push rod. The top of the insert pillar is provided with a molding head that matches the shape of the deep cavity of the product, and the bottom of the insert pillar is rigidly connected to the lower mold base through a fixing plate. The insert column has a through ejector hole inside. One end of the insert ejector rod is connected to the ejector plate, and the other end can slide through the fixed plate and the ejector hole.

2. The injection mold with insert retraction structure according to claim 1, characterized in that: The insert column includes an upper insert and a lower insert. The ends of the upper insert and the lower insert that are connected to each other are provided with a fitting structure. The fitting structure includes a fitting groove at the end, fitting protrusions at the upper and lower ends of the fitting groove, and fitting notches at the left and right ends of the fitting groove.

3. The injection mold with insert retraction structure according to claim 1, characterized in that: The fixing plate is provided with a positioning groove for the lower insert to be embedded and installed.

4. The injection mold with insert retraction structure according to claim 3, characterized in that: The bottom wall of the positioning groove, the upper insert, and the lower insert are provided with long bolt holes. After the upper insert and the lower insert are inserted into the positioning groove, the fixing plate, the upper insert, and the lower insert are fixedly connected by long bolts.

5. The injection mold with insert retraction structure according to claim 1, characterized in that: There are at least four ejector holes, which are evenly distributed around the center of the insert post.

6. The injection mold with insert retraction structure according to claim 5, characterized in that: The push rod assembly comprises multiple push rod assemblies, which are evenly distributed around the center of the insert post on the outer ring of the insert push rod.

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