Zero-degree draft forming part, mold and forming process for grain surface product

Abstract

The invention relates to the technical field of injection molds, in particular to a grain surface product zero-degree draft forming part, a mold and a forming process, according to the technical scheme, the grain surface product zero-degree draft forming part is characterized by comprising an oppositely-opened module and two oppositely-opened and oppositely-closed forming sliding blocks, forming concave positions are formed in the forming sliding blocks, and the forming concave positions are provided with forming grains used for forming the appearance surface of a product; the rear mold core is matched with the split module in a mutual opening and closing manner; the rear mold loose core is movably arranged on the rear mold core and gets close to or away from the split mold set, the split mold set, the rear mold core and the rear mold loose core are arranged in a surrounding mode and form a cavity, and the rear mold loose core is used for forming the inner wall of a product; and at the moment of mold opening, the rear mold loose core retreats from the mold cavity, a vacuum area is formed in the inner cavity of the product, and then the appearance of the product shrinks inwards, the product shrinks inwards in a vacuum negative pressure mode, at the moment, a draft angle does not need to be arranged on the appearance face of the product, 0-degree draft is achieved, and the forming quality of the product is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a zero-degree draft molding part, a mold and a molding process for a textured surface product. Background Art

[0002] As smart wearable products are increasingly popular among consumers, the application market has also put forward new demands on the design of smart wearable products; for example, some products usually have a texture structure on the surface, which not only forms a unique ornamental structure, but also enhances the surface texture of the product. Therefore, textured products still have broad application prospects in the future.

[0003] Among them, spark pattern products are a typical textured product structure. The texture structure is usually obtained simultaneously during the product injection molding process. Specifically, this process requires pre-discharge machining on the molding part of the mold, and then the corresponding molding texture is obtained on the cavity surface of the molding part. Through the molding texture, the fluid plastic injected into the cavity can be embossed.

[0004] However, in the prior art there is a shell component which is an overall thin shell structure and has an opening structure on one side. At the same time, the interior of the component is used to set electronic components, and the outer surface is used as an appearance surface to enhance the aesthetic appearance. At this time, because this type of product has appearance setting requirements, in conventional injection molding methods, it is usually necessary to set a draft angle in the molded part so that the demolding requirements of the texture can be met. Otherwise, the texture of the product will be torn during demolding. However, when the draft angle is set, the appearance of the product will be deformed and the edges will be obvious, affecting the look and feel.

[0005] Therefore, there is still a lack of a solution that can effectively reduce the draft angle and improve the product molding quality. Therefore, it is necessary to improve the existing technology.

[0006] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0007] The invention provides a zero-degree draft molding part, a mold and a molding process for a textured surface product, so as to solve the problems in the prior art that the draft angle of the textured surface product is too large and the product molding quality is insufficient.

[0008] To achieve the above objectives, in a first aspect, the present invention provides a zero-degree draft forming part for a textured surface product using the following solution:

[0009] A zero-degree draft molding part for a textured surface product, comprising a split mold set, comprising two split-open and closed molding slide blocks, wherein the molding slide blocks are provided with molding recesses, and the molding recesses have molding textures for molding the appearance surface of the product;

[0010] The rear mold core cooperates with the split mold set in opening and closing;

[0011] A rear mold core puller is movably arranged on the rear mold core and moves closer to or farther from the split mold set. The split mold set, the rear mold core and the rear mold core puller are mutually surrounded to form a cavity. The rear mold core puller is used to form the inner wall of the product.

[0012] At the moment of mold opening, the rear mold core is pulled out of the mold cavity, and a vacuum area is formed in the inner cavity of the product, thereby shrinking the appearance.

[0013] Preferably, it also includes an inclined ejector rod, and the rear mold core pulling position is provided with an inclined ejector groove for sliding the inclined ejector rod. When the rear mold core pulling exits the mold cavity, the rear mold core pulling drives the inclined ejector rod to exit the product via the inclined ejector groove.

[0014] Preferably, the opening end face of the product is perpendicular to the mold opening direction, and the rear mold core is provided with a step surface that coincides with the opening end face of the product. When the split mold assembly and the rear mold core are closed, the step surface is used to form the opening end face of the product, and the step surface covers from the inner side of the product to the appearance side of the product.

[0015] Preferably, the withdrawal distance of the inclined ejector rod compared to the product is 0.2mm-0.3mm.

[0016] Preferably, the inner wall of the product has a support bone extending along the mold opening direction, and the rear mold core pulling is provided with a support groove for molding the support bone. When the rear mold core pulling is exiting the cavity, the support bone slides and abuts against the support groove.

[0017] Preferably, the draft angle of the supporting bone position is ≤0.3°.

[0018] Preferably, the withdrawal distance of the rear mold core pulling compared to the cavity is less than 10 mm.

[0019] In a second aspect, the present invention provides a mold adopting the following scheme:

[0020] A mold, including a zero-degree draft molding part for a textured surface product, and also including

[0021] The front mold frame is equipped with a side core pulling mechanism;

[0022] A rear mold frame, the rear mold core and the split mold set are arranged on the rear mold frame, and the side core pulling mechanism is connected to the split mold set to control the opening and closing of the split mold set;

[0023] And a driving element is arranged on the rear mold frame and connected with the rear mold core puller, and is used for driving the rear mold core puller to withdraw from the mold cavity at the moment of mold opening.

[0024] Preferably, the rear mold frame comprises a rear mold core fixing plate, the rear mold core is fixedly arranged on the rear mold core fixing plate, and the rear mold core is slidably arranged on the rear mold core fixing plate;

[0025] The driving element comprises:

[0026] A support plate is cooperated with the rear mold core fixing plate to open and close each other, and the rear mold core is fixedly arranged on the support plate;

[0027] And an elastic member is located between the rear mold core fixing plate and the support plate, and two ends of the elastic member are respectively connected to the rear mold core fixing plate and the support plate.

[0028] In a third aspect, the present invention provides a molding process using the following scheme:

[0029] A molding process, applied to zero-degree draft molding parts of textured products, comprises the following steps:

[0030] Product design: set support bones on the inner wall of the product and determine the location of the undercut structure;

[0031] The mold design reserves the location of the rear mold core puller, and the rear mold core puller is provided with a support groove corresponding to the support bone position, and an inclined ejector rod is provided at the rear mold core puller corresponding to the position of the product undercut;

[0032] Prepare injection molding materials and obtain plastic fluid;

[0033] Inject the injection molding material and wait for the product to cool and take shape;

[0034] Sequential mold opening: At the moment of mold opening on the parting surface, the rear mold core puller is driven to move first, and the rear mold core puller and the inclined ejector are pulled away from the product, and then a vacuum area is formed in the inner cavity of the product, causing the product to shrink inward;

[0035] The split mold set is split, driving the molding slide away from one side of the product to open the mold at an O angle;

[0036] Ejection and demoulding drive the inclined ejector rod to extend outward to eject the product.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The zero-degree draft molding parts, molds and molding process of textured products provided by the present invention can drive the rear mold core to be pulled out of the cavity at the moment of mold opening, and use the atmospheric pressure in the vacuum area to make the product concave. On the one hand, it can make the surface of the product more compact and improve the surface quality; on the other hand, it can pull the appearance surface of the product away from the molding texture. Subsequently, the split mold group uses two molding slides to split apart from the product, which can avoid excessive interference between the textured surface and the molding texture on the product, which is equivalent to loosening the textured surface and the molding texture by means of vacuum negative pressure. At this time, there is no need to set a draft angle at the appearance surface of the product, and 0-degree draft is achieved. In addition, since the number of components of the split mold group is small, it will not cause too many texture lines, and the problems of excessive draft angle of textured products and insufficient product molding quality are solved.

[0039] The present invention has other features and advantages, which will be apparent from or will be described in detail in the accompanying drawings and the following detailed description incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a schematic diagram of the product structure;

[0042] Figure 2 It is a schematic structural diagram of a zero-degree draft forming part of a textured surface product in a closed state provided by the first embodiment of the present invention;

[0043] Figure 3 It is a structural schematic diagram of a zero-degree draft forming part of a textured surface product provided in the first embodiment of the present invention in an open state;

[0044] Figure 4 It is a cross-sectional view of a zero-degree draft forming part of a textured surface product provided in the first embodiment of the present invention;

[0045] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0046] Figure 6 yes Figure 3 The enlarged view of point B in the middle;

[0047] Figure 7is a schematic structural diagram of a mold provided by Embodiment 2 of the present invention;

[0048] Figure 8 is a structural schematic diagram of the mold provided by the second embodiment of the present invention from another perspective;

[0049] Fig. 9 It is a cross-sectional view of the mold provided in the second embodiment of the present invention.

[0050] Reference numerals:

[0051] 1001, cavity; 1002, supporting bone position;

[0052] 1. Split mold set; 11. Forming slider; 12. Forming concave position;

[0053] 2. Rear mold core;

[0054] 3. Back mold core pulling; 31. Inclined top groove; 32. Step surface; 33. Support groove;

[0055] 4. inclined ejector rod; 5. front mold frame; 6. rear mold frame; 61. rear mold core fixing plate; 62. push plate; 63. inclined ejector seat;

[0056] 7. driving element; 71. supporting plate; 72. elastic member;

[0057] 8. Side core pulling mechanism. DETAILED DESCRIPTION

[0058] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0060] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0061] The present invention is mainly aimed at injection molding a type of product with thin shell characteristics, referring to Figure 1 This type of product is usually used in smart wearable products. For the sake of demonstration, for example, in this embodiment, a housing product of an earphone battery compartment is provided. This type of product mainly includes a semicircular shell structure, and one side of the product is open, the internal cavity is used to set electronic components, and the outer surface is used as the appearance surface.

[0062] It is understandable that there is no limitation on the specific size and application field of this type of product. As long as a similar product structure is adopted, it should be included in the scope of interpretation of this type of product.

[0063] On this basis, with the increasing demand for product design, texture structures, such as spark patterns, need to be set on the exterior surface (i.e., the outer surface) of some products. Under this condition, the texture structure needs to set a draft angle on the exterior surface of the product to avoid the texture being dragged; in addition, this type of product usually adopts two molding methods during the molding process. In one molding method, a parting surface is usually set at the end of the opening, and the split mold and the rear mold core are used to open and close each other. In the other molding method, a parting surface is also set at the end of the opening of the product, and a split mold formed by multiple slider structures is used to drive multiple parts to open and close to achieve product molding.

[0064] However, there are still many problems in the above two molding methods. For example, when using the first molding method, it is necessary to set the draft setting for the product appearance surface, which will cause obvious shape errors between the actual appearance surface of the product and the appearance surface during design, resulting in the appearance contour failing to meet the standards. In addition, if the second molding method is used, it is necessary to set multiple opening and closing parts. In addition to the draft angle problem, it will also cause more texture lines on the product surface, which cannot achieve a good look and feel. At the same time, overly complex opening and closing molding methods will also make the mold opening action too complicated, the mold opening cycle long, and affect mass production.

[0065] The following is combined with Figure 2-9 The technical solution of the present invention is further illustrated by specific implementation methods.

[0066] Embodiment 1:

[0067] Please refer to Figure 2-Figure 4 This embodiment provides a zero-degree draft molding part for textured products, which can solve the problems of excessively large draft angles of textured products and insufficient product molding quality.

[0068] Specifically, the forming part includes a split mold set 1, a rear mold core 2 and a rear mold core puller 3, wherein the split mold set 1 and the rear mold core 2 are mainly installed on a mold frame, and the mold frame usually includes a front mold frame 5 and a rear mold frame 6. In this embodiment, the split mold set 1 and the rear mold core 2 are simultaneously arranged on the rear mold frame 6, and the two realize opening and closing actions through the mold frame. The specific setting method of the mold frame will be explained below and will not be explained in detail here.

[0069] Reference Figure 2 and Figure 3 In this embodiment, the split mold set 1 includes two split open and closed forming sliders 11. It can be understood that the relative displacement direction of the two forming sliders 11 is perpendicular to the mold opening direction of the mold frame, and the two forming sliders 11 can be close to or away from each other.

[0070] At the same time, a molding recess 12 is provided on the molding slider 11, and the molding recess 12 is mainly used to mold the appearance surface of the product. Specifically, when the two molding sliders 11 are close to each other and abut against each other, the two molding recesses are spliced ​​with each other to form a recess structure with the same appearance contour as the product; on this basis, the inner wall of the molding recess 12 has a molding texture for molding the appearance surface of the product. The molding texture is generally formed on the inner wall of the molding recess 12 by copper electrode discharge machining. The molding texture extrude the plastic fluid to form a texture feature on the appearance surface of the product.

[0071] In addition, the molding slider 11 is provided with a gate (not marked in the figure) connected to the molding recess 12. The gate is used for the inflow of plastic fluid. The gate can be a point gate, a bull horn gate or a hot runner gate. The specific type of the gate can be set according to the flow requirements during the injection process. The specific setting method is not limited here. No matter what specific gate structure is used, it should be included in the interpretation scope of the gate.

[0072] At the same time, the rear mold core 2 is arranged opposite to the split mold group 1. Specifically, the rear mold core 2 in this embodiment is a seat plate structure, and the two forming slide blocks 11 are respectively located on the opposite sides of the rear mold core 2; under the action of the mold frame, the forming slide blocks 11 can be close to or away from the rear mold core 2, and the rear mold core 2 can cooperate with the split mold group 1 to open and close each other. It can be understood that the opening and closing states of the rear mold core 2 and the split mold group 1 mainly include two, one of which is the mold closing state, which means that the mold is closed in the mold opening direction, and at the same time, the two forming slide blocks 11 are driven to approach each other for splicing, and the rear mold core 2 and the forming slide blocks 11 are simultaneously abutted against each other and closed, and are in the mold closing state, and injection molding can be performed; and the other state is the mold opening state, and the molds are opened to each other along the mold opening direction, and the split mold group 1 is away from the rear mold core 2, and the product can be demolded at this time.

[0073] Based on this, refer to Figure 3 and Figure 4 , the rear mold core puller 3 is movably arranged on the rear mold core 2. Specifically, the displacement direction of the rear mold core puller 3 is perpendicular to the direction of the forming slider 11, and the rear mold core puller 3 can be close to or away from the split mold group 1 along the mold opening direction of the mold; when the split mold group 1 and the rear mold core 2 are molded, the rear mold core puller 3 is close to the split mold group 1, and the split mold group 1, the rear mold core 2 and the rear mold core puller 3 are mutually surrounded to form a cavity 1001, and the rear mold core puller 3 is used to form the inner wall of the product; on this basis, the product cools and shrinks, and the inner cavity of the product is tightly wrapped on the rear mold core puller 3. At the moment of mold opening, the rear mold core puller 3 is controlled to exit the cavity 1001, and the rear mold core puller 3 is away from the split mold group 1, so that a vacuum area can be formed in the inner cavity of the product. At this time, under the action of atmospheric pressure, the overall appearance of the product will shrink.

[0074] By adopting the above scheme, since the product will shrink after cooling, when a texture is set on the appearance surface of the product, the texture of the product will bite on the molding texture of the split mold 1. At this time, the conventional method needs to use the draft angle for demolding; while this scheme drives the rear mold core 3 to be withdrawn from the cavity 1001 at the moment when the split mold 1 and the rear mold core 2 are opened, and utilizes the atmospheric pressure in the vacuum area to make the product concave and the appearance shrink inward, with a shrinkage range of approximately 0.05mm, so that the appearance surface of the product can be withdrawn from the molding texture, and the appearance surface of the product and the split mold 1 are loosened from each other. Subsequently, the split mold 1 uses two molding slides 11 to open apart to leave the product. In this process, it is possible to avoid excessive interference between the texture features on the appearance surface of the product and the molding texture.

[0075] The above process is equivalent to loosening the texture surface and the molded texture by means of vacuum negative pressure. At this time, there is no need to set the draft angle at the appearance surface of the product, which provides a setting basis for 0-degree draft, solves the problem of excessive draft angle, and optimizes and improves the surface quality of the product. In addition, since the number of parts in the split mold set 1 is small, it will not cause too many texture lines, and can significantly simplify the mold opening action, shorten the mold opening cycle, and optimize and improve mass production.

[0076] Optionally, in order to drive the rear mold core puller 3 to smoothly exit the mold cavity 1001, the molding part shown in this embodiment may also include a driving element 7 (not marked in the figure), and the rear mold core puller 3 is connected to the driving element 7. Under the action of the driving element 7, the rear mold core puller 3 can be directly controlled to achieve displacement. In one embodiment, the driving element 7 may be the structure of the mold frame itself, and the thrust during mold opening and closing is used to control the movement of the rear mold core puller 3. In another embodiment, the driving element 7 may also be a separate driving element 7, such as a cylinder element. By connecting the rear mold core puller 3 to the cylinder element, the displacement of the rear mold core puller 3 can also be controlled. The specific setting method of the driving element 7 will be explained in the following embodiment 2, but will not be explained in detail in this embodiment, and the driving element 7 in the second embodiment may also be regarded as a component of the zero-degree draft molding part of the textured product in this embodiment.

[0077] Furthermore, in a specific setting, a snap-in structure is usually provided at the inner wall of the product, and the conventional setting method at this time is to provide an inclined ejector rod 4 inside the product, and use the inclined ejector rod 4 to form the snap-in structure of the product; however, the conventional inclined ejector rod 4 structure is generally used to obliquely eject the product. If the inclined ejector rod 4 is provided on the movably arranged rear mold core puller 3, it may hinder the retreat movement of the rear mold core puller 3 or the retraction movement of the product.

[0078] Based on this, continue to refer to Figure 4 In order to realize the molding of the buckle structure of the product and prevent the inclined ejector rod 4 from hindering the retreating action of the rear mold core pull 3, the present solution also includes an inclined ejector rod 4, and an inclined ejector groove 31 for sliding the inclined ejector rod 4 is provided at the rear mold core pull 3. Specifically, the inclined ejector groove 31 is provided at the upper and lower ends of the rear mold core pull 3, one end of the inclined ejector groove 31 is connected to the mold cavity 1001, and the end of the inclined ejector groove 31 close to the mold cavity 1001 is inclined toward the middle of the rear mold core pull 3.

[0079] By adopting the above-mentioned setting method, when the rear mold core puller 3 exits the cavity 1001, the rear mold core puller 3 drives the inclined top rod 4 to synchronously exit the product via the inclined top groove 31. On the one hand, the inclined top groove 31 provides the inclined top rod 4 and the rear mold core puller 3 with freedom of relative movement, so that the two can move independently under the guidance of the inclined top groove 31 without interfering with each other; on the other hand, when the inclined top groove 31 exits the product, the inclined top groove 31 is equivalent to moving in a direction perpendicular to the mold opening direction, that is, translating toward the inside of the product, providing space for the retraction action of the product to avoid obstruction to the retraction action of the product. The structural setting is ingenious and reliable.

[0080] It needs to be explained that, in order to enable the inclined ejector rod 4 to achieve relative displacement with the rear mold core puller 3, the inclined ejector rod 4 can be movably connected to an inclined ejector seat 63 (not marked in the figure), and the inclined ejector seat 63 provides support and freedom of movement for the inclined ejector rod 4. The specific setting method of the inclined ejector seat 63 will be specifically explained below and will not be repeated here.

[0081] Furthermore, the withdrawal distance of the inclined ejector rod 4 compared with the product is 0.2mm-0.3mm. For example, the withdrawal distance of the inclined ejector rod 4 can be 0.2mm, 0.25mm or 0.3mm, and can also be 0.2mm-0.25mm or 0.25mm-0.3mm. When the withdrawal distance of the inclined ejector rod 4 is less than 0.2mm, the withdrawal distance may be insufficient, thereby causing interference between the inclined ejector rod 4 and the product. When the withdrawal distance of the inclined ejector rod 4 is greater than 0.3mm, the space required for the installation of the inclined ejector rod 4 may be too large, resulting in an insufficiently compact structure. When the withdrawal distance of the inclined ejector rod 4 compared with the product is 0.2mm-0.3mm, the inclined ejector rod 4 has a suitable withdrawal distance and can also meet the requirements of compact structure.

[0082] Further, refer to Figure 4 and Figure 5 In this embodiment, the open end face of the product is perpendicular to the mold opening direction, and the rear mold core pull 3 is provided with a step surface 32 that coincides with the open end face of the product. When the split mold assembly 1 and the rear mold core 2 are closed, the step surface 32 is used to form the open end face of the product, and the step surface 32 is covered from the inner side of the product to the appearance side of the product when it is set.

[0083] By adopting the above arrangement, in the mold opening state, the opening end face of the product is instantly loosened from the rear mold core 3, so that the opening end face of the product can be instantly released to ensure that the product can achieve rapid inward shrinkage deformation.

[0084] Further, refer to Figure 1 and Figure 6 The inner wall of the product has a support bone 1002 extending along the mold opening direction, and correspondingly, the rear mold core pull 3 is provided with a support groove 33 for forming the support bone 1002. Among them, by injecting plastic fluid into the support groove 33, the product can form the support bone 1002, and the support bone 1002 can enhance the overall structural strength of the product to avoid the thin wall of the product from being twisted and deformed when the rear mold core pull 3 is pulled out, which may cause the rear mold core pull 3 and the product to be unable to be separated immediately. Therefore, the support bone 1002 can enhance the structural strength of the product so that the rear mold core pull 3 can be smoothly loosened from the product when it is withdrawn; in addition, when the rear mold core pull 3 is withdrawing from the cavity 1001, the support bone 1002 and the support groove 33 are slidably abutted, so that the product is not easily offset when it is loosened, and the product retraction action is more uniform and consistent.

[0085] Furthermore, in order to facilitate the mutual loosening of the product and the rear mold core 3, a draft angle is set at the support bone position 1002. It should be explained that the draft angle of this part is located on the inner side of the product, which will not affect the appearance of the product. The appearance of the product can still achieve a 0-degree draft setting. Specifically, the draft angle of the support bone position 1002 is ≤0.3°. For example, the draft angle can be 0.3°, 0.2° or 0.1°, or between 0.3° and 0.2° or 0.2° and 0.1°; wherein, when the draft angle is too large, the final thickness of the support bone position 1002 may be too large, affecting the stacking of internal electronic components. When the draft angle of the support bone position 1002 is less than 0.3°, it can not only improve the smoothness of the product when it is loosened, but also meet the inner cavity space requirements of the product.

[0086] Furthermore, the withdrawal distance of the rear mold core puller 3 compared to the cavity 1001 is less than 10 mm. For example, the withdrawal distance of the rear mold core puller 3 can be 10 mm, 5 mm or 1 mm. If the withdrawal distance of the rear mold core puller 3 is greater than 10 mm, the support bone position 1002 may be loosened from the rear mold core puller 3, thereby causing the product to lose support prematurely, resulting in excessive deformation during the shrinking process. Therefore, when the withdrawal distance of the rear mold core puller 3 compared to the cavity 1001 is less than 10 mm, it can ensure that the support bone position 1002 is firmly supported.

[0087] The implementation principle of this scheme is: at the moment of opening the split mold group 1 and the rear mold core 2, the rear mold core puller 3 is driven to retreat, so that the rear mold core puller 3 is completely separated from the product, and the rear mold core puller 3 is inserted into the slider at a large angle, and drives the inclined ejector rod 4 to retract, forming a vacuum state of the inner cavity, and the product is concave by about 0.05mm. Subsequently, the molding sliders 11 are opened to each other. The above-mentioned mold opening process can make the appearance surface of the product avoid the processing depth of the molding texture, realize 0-angle mold opening, and at the same time simplify the complexity of mold opening, shorten the mold opening cycle, and optimize and improve the mass production performance of the product.

[0088] Embodiment 2:

[0089] On the basis of the first embodiment, the features not explained in the first embodiment are explained in the first embodiment, and no further description is given here. The present embodiment further provides a mold based on the structure of the first embodiment. Figures 7 to 9 The mold includes the zero-degree draft molding part of the textured surface product in Example 1, and also includes a front mold frame 5, a rear mold frame 6 and a driving element 7.

[0090] Among them, refer to Figure 7 and Figure 8, a side core pulling mechanism 8 is provided on the front mold frame 5, and the split mold set 1 is provided on the rear mold frame 6. The side core pulling mechanism 8 is connected to the split mold set 1 and is used to control the opening and closing of the split mold set 1. Specifically, when the split mold set 1 in this embodiment is installed, a track module can be firstly provided on the rear mold frame 6, and the forming slider 11 can be slidably provided on the track module. Under the guidance of the track module, the two forming sliders 11 can be moved closer to or farther from each other.

[0091] On this basis, in one of the embodiments, the side core pulling mechanism 8 usually includes an inclined wedge and a slider seat, the slider seat is fixedly connected to the forming slider 11, the inclined wedge is fixedly set on the front mold frame 5, and a guiding structure such as an inclined guide column or an inclined slide rail is arranged between the slider seat and the inclined wedge. In the process of opening and closing of the front mold frame 5 and the rear mold frame 6, the slider seat can be pushed to move back and forth through the above-mentioned guiding structure, thereby driving the forming slider 11 to move synchronously, so that the double-opening and closing functions of the double-opening mold group 1 can be realized.

[0092] In another embodiment, the slider seat can also be omitted, and the inclined wedge and the forming slider 11 can be directly slidably matched with each other through an inclined guide column or an inclined guide rail structure. Such a setting can also control the opening and closing of the split mold group 1. The side core pulling mechanism 8 is a common linkage structure, and its specific setting method will not be described here.

[0093] On this basis, the rear mold core 2 is arranged on the rear mold frame 6. Usually, the rear mold core 2 is directly fixed on the rear mold frame 6. On this basis, the rear mold core 2 in this embodiment is provided with an escape opening, which is used to accommodate the rear mold core pull 3 and enable the rear mold core pull 3 to pass through the rear mold core 2 and finally cooperate with the split mold set 1 to open and close.

[0094] In addition, combined Fig. 9 The driving element 7 is arranged on the rear mold frame 6. The driving element 7 is located on the side of the rear mold core puller 3 away from the cavity 1001, and the driving element 7 is connected to the rear mold core puller 3. The driving element 7 is used to drive the rear mold core puller 3 to withdraw from the cavity 1001 at the moment of mold opening to realize the function of shrinking the product appearance.

[0095] In the above scheme, by arranging the side core pulling mechanism 8 on the front mold frame 5, the split mold group 1 can be controlled in linkage during the mold opening and closing processes, and the action is quick and stable. On this basis, by arranging the rear mold core 2 and the split mold group 1 on the rear mold frame 6, the rear mold core 2 and the split mold group 1 are stably supported. Under the action of the driving element 7, the displacement of the rear mold core pulling 3 is controlled, and the opening and closing actions of the structure can be performed stably and accurately.

[0096] Further, refer to Figure 8 and Fig. 9The rear mold frame 6 includes a rear mold core fixing plate 61, and the driving element 7 includes a support plate 71 and an elastic member 72. The rear mold core fixing plate 61 is arranged opposite to the front mold frame 5, the rear mold core 2 is fixedly arranged on the rear mold core fixing plate 61, and the rear mold core puller 3 is slidably arranged on the rear mold core fixing plate 61.

[0097] In addition, the support plate 71 is located on the side of the rear mold core fixing plate 61 away from the front mold frame 5, and the support plate 71 and the rear mold core fixing plate 61 cooperate with each other in opening and closing. Specifically, in order to realize the opening and closing action between the support plate 71 and the rear mold core fixing plate 61, a guide column and a guide sleeve structure can be provided between the support plate 71 and the rear mold core fixing plate 61, and under the guiding action of the guide column and the guide sleeve, the support plate 71 and the rear mold core 2 can cooperate with each other in opening and closing.

[0098] On this basis, the rear mold core puller 3 is fixedly installed on the support plate 71. When the support plate 71 is opened relative to the fixed plate of the rear mold core puller 3, the support plate 71 can drive the rear mold core puller 3 to be pulled out of the cavity 1001 to achieve a backward movement; otherwise, it drives the rear mold core puller 3 to be pressed into the cavity 1001 to reset the rear mold core puller 3.

[0099] Furthermore, the elastic member 72 is located between the rear mold fixing plate 61 and the support plate 71. In the present embodiment, the elastic member 72 adopts a spring structure. To facilitate the installation of the elastic member 72, a blind hole structure for accommodating the elastic member 72 is provided on the rear mold fixing plate 61. On this basis, the elastic member 72 is provided in the blind hole, and its two ends are respectively connected to the rear mold fixing plate 61 and the support plate 71.

[0100] Based on the above structural setting, when the front mold frame 5 and the rear mold frame 6 are in the mold opening state, the elastic member 72 can push the rear mold core fixing plate 61 and the support plate 71 to separate from each other, thereby providing a mechanical linkage force for the rear mold core pulling 3 to exit the cavity 1001; and when the front mold frame 5 and the rear mold frame 6 are in the mold closing state, the support plate 71 and the rear mold core fixing plate 61 compress the elastic member 72, and the elastic member 72 provides a thrust to separate the rear mold core fixing plate 61 and the support plate 71 from each other when the mold is opened next time.

[0101] Optionally, in another embodiment, the driving element 7 may be an element such as a cylinder or a hydraulic cylinder that can output reciprocating linear motion. When setting, it is only necessary to fix the driving element 7 on the support plate 71 and connect the telescopic rod to the rear mold core puller 3. The displacement of the rear mold core puller 3 can be controlled by telescopic motion.

[0102] It can be understood that any element that can drive the back mold core puller 3 to move back and forth can be used interchangeably. In this embodiment, there is no restriction on the specific setting method of the driving element 7. No matter what specific structural form the driving element 7 adopts, it should be included in the interpretation scope of the driving element 7. In addition, the driving element 7 shown in this embodiment can also be combined with the zero-degree draft molding parts of the textured product in Example 1.

[0103] Furthermore, in order to realize ejection and demolding of the product, the rear mold frame 6 in this embodiment also includes a push plate 62, wherein a slanted ejector seat 63 is fixedly provided on the push plate 62, and the end of the slanted ejector rod 4 away from the cavity 1001 is slidably matched with the slanted ejector seat 63. At this time, during the back and forth movement of the push plate 62, the slanted ejector rod 4 can be pushed out through the slanted ejector seat 63, thereby ejecting the product and allowing the product to be demolded.

[0104] In addition, with the mutual sliding cooperation between the inclined ejector seat 63 and the inclined ejector rod 4, when the rear mold core puller 3 withdraws the product, the inclined ejector rod 4 can obtain the freedom of movement to retreat behind the product, so that the withdrawal action can be carried out smoothly. It can be understood that the specific setting method of the push plate 62 and the inclined ejector seat 63 is a conventional setting, and the detailed setting method and implementation principle of the two are not elaborated here.

[0105] The implementation principle of this embodiment is: a mold for zero-degree demolding parts of textured products is provided. On the one hand, by arranging a side core pulling mechanism 8 on the front mold frame 5, the split mold group 1 located on the rear mold frame 6 can realize mechanical linkage control. On this basis, by arranging a driving element 7 on the rear mold frame 6, the movement of the rear mold core pulling 3 is mechanically linked, and the movements of each structure are closely coordinated, and the movements are fast and precise.

[0106] Embodiment three:

[0107] This embodiment provides a molding process, which is based on the zero-degree draft molding part of the textured surface product in the first embodiment, and can also be based on the mold in the second embodiment, including the following steps:

[0108] S1: Product design, modeling the outline of the product, setting the support bone 1002 structure on the inner wall of the product, and determining the setting position of the undercut structure. The support bone 1002 and the undercut structure need to be staggered to avoid interference with subsequent structures.

[0109] S2: Mold design, reserve the setting position of the rear mold core pull 3. Specifically, a corresponding setting space can be reserved on the rear mold frame 6, and a support groove 33 corresponding to the support bone position 1002 can be set at the rear mold core pull 3, and the support groove 33 can be formed on the surface of the rear mold core pull 3 by milling.

[0110] At the same time, a tilted ejector rod 4 is arranged at the position of the rear mold core puller 3 corresponding to the undercut of the product. Specifically, a tilted ejector groove 31 is firstly arranged at the rear mold core puller 3, and the tilted ejector rod 4 is assembled into the tilted ejector groove 31.

[0111] Furthermore, the support groove 33 and the inclined ejector rod 4 are staggered in position, thereby adapting to the staggered support bone positions 1002 and the undercut structure on the product to avoid structural interference.

[0112] S3: Prepare injection molding materials. Different types of masterbatch raw materials can be used according to the actual needs of the product, such as ABS, PP, PC, etc. The specific type of injection molding material is not limited here; then, according to the melting points of different materials, the injection molding materials are placed in the injection molding equipment, and the injection molding equipment is adjusted to a suitable melting temperature. Optionally, the injection molding equipment can use an injection molding machine to obtain a plastic fluid.

[0113] S4: Injecting the injection material, aligning the injection port of the injection molding machine with the runner port of the molded part or the gate sleeve of the mold, and controlling the injection molding machine to eject the plastic fluid, and then injecting the plastic fluid into the cavity 1001 of the molded part in the mold closing state, and waiting for the product to cool and set.

[0114] S4-1: During the cooling and molding process of the product, the temperature of the molding slider 11 can be controlled within the range of 110 degrees Celsius to 120 degrees Celsius, and the temperature of the rear mold core puller 3 can be controlled between 70 degrees Celsius and 80 degrees Celsius, so as to shrink the inner cavity of the product by utilizing the thermal expansion and contraction state.

[0115] S5: Sequential mold opening. At the moment of mold opening on the parting surface, the rear mold core puller 3 is driven to move first under the action of the driving element 7. At the same time, under the action of the supporting bone position 1002, the product is deformed evenly to ensure that the rear mold core puller 3 is pulled away from the product. The rear mold core puller 3 drives the inclined ejector rod 4 to retreat, so that the inclined ejector rod 4 retreats synchronously and loosens the product, and then draws in the inner cavity of the product to form a vacuum area, causing the product to shrink inward.

[0116] S5-1: The shrinkage size of the product is controlled between 0.03mm-0.07mm.

[0117] S6: The split mold set 1 is split, specifically, the front mold frame 5 and the rear mold frame 6 are opened to each other, and the molding slide 11 is driven away from one side of the product by the side core pulling mechanism 8, and the O-angle mold is opened under the effect of the product appearance shrinking inward.

[0118] S7: ejection and demoulding, driving the inclined ejector rod 4 to extend outward to eject the product. Specifically, a straight ejector rod can be set on the push plate 62 of the mold frame at this time. The straight ejector rod is combined with the inclined ejector rod 4. Under the pushing action of the push plate 62, the product is ejected to achieve demoulding.

[0119] So far, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A zero-degree draft forming part for a textured surface product, characterized in that: include A split mold assembly (1) comprises two split-opening and closing molding slide blocks (11), wherein the molding slide blocks (11) are provided with molding recesses (12), and the molding recesses (12) have molding textures for molding the appearance of a product; The rear mold core (2) cooperates with the split mold set (1) to open and close each other; A rear mold core puller (3) is movably arranged on the rear mold core (2) and is moved closer to or farther away from the split mold assembly (1). The split mold assembly (1), the rear mold core (2) and the rear mold core puller (3) are mutually arranged to form a mold cavity (1001). The rear mold core puller (3) is used to mold the inner wall of a product. At the moment of mold opening, the rear mold core (3) withdraws from the mold cavity (1001), and forms a vacuum area in the inner cavity of the product, thereby shrinking its appearance.

2. The zero-degree draft forming part of a textured surface product according to claim 1, characterized in that: It also includes an inclined ejector rod (4), and the rear mold core puller (3) is provided with an inclined ejector groove (31) for the inclined ejector rod (4) to slide. When the rear mold core puller (3) exits the mold cavity (1001), the rear mold core puller (3) drives the inclined ejector rod (4) to exit the product via the inclined ejector groove (31).

3. The zero-degree draft forming part of a textured surface product according to claim 2, characterized in that: The open end face of the product is perpendicular to the mold opening direction, and the rear mold core (3) is provided with a step surface (32) that coincides with the open end face of the product. When the split mold assembly (1) and the rear mold core (2) are closed, the step surface (32) is used to mold the open end face of the product, and the step surface (32) covers from the inner side of the product to the outer surface side of the product.

4. The zero-degree draft molded part of a textured surface product according to claim 2, characterized in that: The withdrawal distance of the inclined ejector rod (4) compared with the product is 0.2mm-0.3mm.

5. The zero-degree draft molded part for textured surface products according to claim 1, characterized in that: The inner wall of the product has a support bone position (1002) extending along the mold opening direction, and the rear mold core puller (3) is provided with a support groove (33) for forming the support bone position (1002). When the rear mold core puller (3) exits the mold cavity (1001), the support bone position (1002) and the support groove (33) slide and abut against each other.

6. The zero-degree draft forming part of a textured surface product according to claim 5, characterized in that: The draft angle of the supporting bone position (1002) is ≤0.3°.

7. The zero-degree draft molded part of a textured surface product according to claim 4, characterized in that: The withdrawal distance of the rear mold core puller (3) compared to the mold cavity (1001) is less than 10 mm.

8. A mold, comprising the zero-degree draft molding part of a textured surface product according to any one of claims 1 to 7, characterized in that: Also includes: The front mold frame (5) is provided with a side core pulling mechanism (8); A rear mold frame (6), the rear mold core (2) and the split mold set (1) are arranged on the rear mold frame (6), and the side core pulling mechanism (8) is connected to the split mold set (1) and is used to control the opening and closing of the split mold set (1); And a driving element (7), which is arranged on the rear mold frame (6) and connected to the rear mold core puller (3), and is used to drive the rear mold core puller (3) to withdraw from the mold cavity (1001) at the moment of mold opening.

9. The mold according to claim 8, characterized in that: The rear mold frame (6) comprises a rear mold core fixing plate (61), the rear mold core (2) is fixedly arranged on the rear mold core fixing plate (61), and the rear mold core puller (3) is slidably arranged on the rear mold core fixing plate (61); The driving element (7) comprises: A support plate (71) is cooperated with the rear mold core fixing plate (61) in opening and closing, and the rear mold core puller (3) is fixedly arranged on the support plate (71); and an elastic member (72), which is located between the rear mold core fixing plate (61) and the support plate (71), and has two ends respectively connected to the rear mold core fixing plate (61) and the support plate (71).

10. A molding process, applied to the zero-degree draft molding part of the textured surface product according to any one of claims 1 to 7, characterized in that: The steps include: Product design, setting a support bone position (1002) on the inner wall of the product, and determining the setting position of the undercut structure; The mold design reserves a setting position for the rear mold core puller (3), a support groove (33) corresponding to the support bone position (1002) is set at the rear mold core puller (3), and an inclined ejector rod (4) is set at the position of the rear mold core puller (3) corresponding to the product undercut; Prepare injection molding materials and plastic fluids; Inject the injection molding material and wait for the product to cool and take shape; Sequential mold opening: at the moment of mold opening on the parting surface, the rear mold core puller (3) is driven to move first, and the rear mold core puller (3) and the inclined ejector (4) are pulled away from the product, and then a vacuum area is formed in the inner cavity of the product, so that the product shrinks inward; The split mold assembly (1) is split, and the molding slide block (11) is driven away from one side of the product to perform an O-angle mold opening; The demoulding is performed by ejecting the product, and the inclined ejector rod (4) is driven to extend outward to eject the product.

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