Injection mold for automobile wheel trim

Abstract

The utility model discloses an automobile wheel eyebrow injection mold which comprises a mold body, a driving device, an ejector pin assembly and a first forming assembly, the mold body is provided with an upper mold body and a lower mold body, the driving device is installed on the lower mold body, and the ejector pin assembly is installed on the lower mold body and connected with the driving device; the first forming assembly is installed on the lower die and used for forming a rib position of the automobile wheel eyebrow. The device has the beneficial effects that through different actions of the driving device, the first forming assembly at the rib position of the product can be pulled out firstly; then the whole product is ejected out through the driving device, so that the problem of deformation of the product caused by stress concentration at the rib position in the demolding process is avoided; by means of the step-by-step demolding mode, the size precision and shape completeness of the automobile wheel trim can be guaranteed, and the specification requirements of products are met.

Description

Technical Field

[0001] This application relates to the technical field of molds, and particularly to an injection mold for an automobile wheel arch. Background Art

[0002] An injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of some complex-shaped parts; specifically, it means injecting the heat-melted plastic into the mold cavity under high pressure by an injection molding machine, and after cooling and solidifying, a formed product is obtained.

[0003] The existing wheel arch structure is as Figure 1 shown. It has multiple rib positions 101. The wheel arch product is relatively large and the product material is relatively soft, so the product after production will be deformed relatively large. If it is ejected and demolded normally at one time, deformation is likely to occur at the rib position 101, and then the product does not meet the product specification requirements. For this reason, an injection mold for an automobile wheel arch is proposed to solve the above technical problems. Utility Model Content

[0004] One of the purposes of this application is to provide an injection mold for an automobile wheel arch.

[0005] To achieve the above purpose, the technical solution adopted in this application is: an injection mold for an automobile wheel arch, including a mold body, a driving device, a thimble assembly, and a first forming assembly. The mold body has an upper mold and a lower mold. The driving device is installed on the lower mold. The thimble assembly is installed on the lower mold and is connected to the driving device. The first forming assembly is installed on the lower mold and is used for forming the rib position of the automobile wheel arch. After mold opening: when the driving device performs a first action, the first forming assembly is adapted to be separated from the rib position of the automobile wheel arch under the action of the driving device; when the driving device performs a second action, the driving device is adapted to eject the automobile wheel arch in the lower mold cavity through the thimble assembly.

[0006] Preferably, the lower mold includes a mold base and a mold body. The mold body is vertically slidably installed at the top of the mold base. The thimble assembly is vertically slidably installed in the mold base. The driving device is installed on the mold body and the output end is cooperatively connected to the thimble assembly. The first forming assembly is installed at the top of the mold base and is cooperatively connected to the mold body. When the driving device performs a first action, the mold body is adapted to move upward and away from the mold base under the drive of the driving device, so that the first forming assembly is separated from the rib position of the automobile wheel arch; when the driving device performs a second action, the thimble assembly is adapted to move upward relative to the mold body under the drive of the driving device and eject the automobile wheel arch.

[0007] Preferably, the mold body and the ejector pin assembly are cooperated through a traction structure; when the driving device performs a first action, the traction structure is in a locked state, and at this time, the ejector pin assembly is adapted to move upward synchronously with the mold body under the action of the traction structure.

[0008] Preferably, the traction structure includes a traction rod and a traction sleeve. The traction rod is installed on the mold body, the traction sleeve is installed on the ejector pin assembly, and the traction rod and the traction sleeve are slidably cooperated; when the driving device performs a first action, the traction rod and the traction sleeve are in a state of being extremely far away from each other.

[0009] Preferably, there are a plurality of gates in the lower mold, and the gates are located at the side part near the rib position.

[0010] Preferably, the injection mold for the automobile wheel arch further includes a plurality of second forming components, which are horizontally slidably installed on the lower mold and cooperate with the lower mold to form a runner that cooperates with the gate, and the second forming components and the upper mold are cooperated through a guiding structure.

[0011] Preferably, the guiding structure includes an inclined guide post and an inclined guide groove. The inclined guide post is installed on the upper mold, and the inclined guide groove is arranged on the second forming component; when the mold is opened, the second forming component is adapted to slide horizontally and away from the automobile wheel arch under the inclined sliding cooperation of the inclined guide post and the inclined guide groove.

[0012] Preferably, the runner includes a buffer section and a vertical section. The first end of the buffer section is connected to the gate, the second end of the buffer section is communicated with the bottom end of the vertical section, and the top end of the vertical section is communicated with the cavity of the lower mold.

[0013] Preferably, the buffer section includes a horizontal part and a vertical part. The first end of the horizontal part forms the first end of the buffer section, the second end of the horizontal part is communicated with the top end of the vertical part, and the bottom end of the vertical part forms the second end of the buffer section.

[0014] Preferably, the conduction area of the vertical section increases from top to bottom.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows:

[0016] By providing a driving device in the present utility model, through different actions of the driving device, first, the first forming component at the rib position of the product can be withdrawn; then, the entire product can be ejected by the driving device, thus avoiding the deformation problem of the product caused by stress concentration at the rib position during the demolding process; through this step-by-step demolding method, the dimensional accuracy and shape integrity of the automobile wheel arch can be ensured, meeting the specification requirements of the product. Brief Description of the Drawings

[0017] Figure 1 This is a schematic structural diagram of the car fender product of the present utility model.

[0018] Figure 2 This is a schematic diagram of the overall structure of the present utility model.

[0019] Figure 3 This is a schematic diagram of the structure after the upper mold of the present utility model is opened.

[0020] Figure 4 This is a schematic diagram of the structure of the first forming component of the present utility model.

[0021] Figure 5 This is a schematic diagram when the driving device of the present utility model performs the first action.

[0022] Figure 6 This is a schematic diagram when the driving device of the present utility model performs the second action.

[0023] Figure 7 This is a schematic diagram of the traction structure of the present utility model.

[0024] Figure 8 This is a three-dimensional schematic diagram when the runner of the present utility model cooperates with the second forming component.

[0025] Figure 9 This is a schematic diagram of the specific structure of the runner of the present utility model.

[0026] Figure 10 This is a front view schematic diagram when the runner of the present utility model cooperates with the second forming component.

[0027] In the figure: 1. Car fender; 101. Rib position; 2. Mold body; 201. Upper mold; 202. Lower mold; 2021. Mold body; 2022. Mold frame; 3. Driving device; 4. Ejector pin assembly; 5. First forming component; 6. Second forming component; 7. Gate; 8. Traction structure; 801. Traction rod; 802. Traction sleeve; 9. Runner; 901. Vertical section; 902. Buffer section; 9021. Vertical part; 9022. Horizontal part. Detailed Embodiments

[0028] Next, in combination with the specific embodiments, the present application will be further described. It should be noted that on the premise of non-conflict, the following-described embodiments or technical features can be arbitrarily combined with each other to form new embodiments.

[0029] In the description of the present application, it should be noted that for orientation terms, such as the terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and positional relationship are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence.

[0031] One preferred embodiment of the present application is, for example Figures 1 to 10 As shown, an injection mold for an automobile wheel arch includes a mold body 2, a driving device 3, a thimble assembly 4, and a first molding assembly 5. The mold body 2 has an upper mold 201 and a lower mold 202. The driving device 3 is installed on the lower mold 202. The thimble assembly 4 is installed on the lower mold 202 and is connected to the driving device 3. The first molding assembly 5 is installed on the lower mold 202 and is used to mold the rib 101 of the automobile wheel arch 1.

[0032] When the mold is opened, that is, after the upper mold 201 and the lower mold 202 are separated: At this time, the driving device 3 is started to perform a first action, and then the first molding assembly 5 will be separated from the rib 101 of the automobile wheel arch 1 under the action of the driving device 3; when the driving device 3 performs a second action, at this time, the driving device 3 can use the thimble assembly 4 to eject the product (i.e., the automobile wheel arch 1) in the cavity of the lower mold 202, thereby realizing the entire demolding process.

[0033] It can be seen that when demolding, first, the first molding assembly 5 at the rib 101 of the product can be withdrawn. Since the product is located in the cavity at this time (the whole is still limited by the cavity), the demolding at the rib 101 hardly causes deformation to the product; then the entire product is ejected by the driving device 3, thus avoiding the deformation problem of the product caused by stress concentration at the rib 101 during the demolding process. By this step-by-step demolding method, the dimensional accuracy and shape integrity of the automobile wheel arch 1 can be ensured, meeting the specification requirements of the product. At the same time, only one driving device is required for the whole process, which can reduce costs and the installation space inside the mold.

[0034] It should be noted that the specific structure and working principle of the driving device 3 are well-known technologies to those skilled in the art, so no detailed description will be given here; common driving devices 3 include hydraulic cylinders, pneumatic cylinders, and linear motors, etc., and a hydraulic cylinder is preferably used in this application.

[0035] As a further description of the above embodiment: the lower mold 202 includes a mold base 2022 and a mold body 2021. The mold body 2021 is vertically slidably installed at the top of the mold base 2022. The ejector pin assembly 4 is vertically slidably installed in the mold base 2022. The driving device 3 is installed on the mold body 2021 and its output end is cooperatively connected with the ejector pin assembly 4. The first forming assembly 5 is fixedly installed at the top of the mold base 2022 and cooperates with the mold body 2021.

[0036] It can be understood that, as shown in a of Figure 5 , assuming this is the initial state at this time, when the driving device 3 performs the first action (i.e., the extension of the hydraulic cylinder): one end of the piston rod of the hydraulic cylinder abuts against the bottom end position of the mold base 2022. Then, under the support of the mold base 2022, the mold body 2021 will move upward and away from the mold base 2022 under the drive of the extension of the driving device 3. At this time, it is equivalent to the first forming assembly 5 extracting the rib position 101 of the automobile wheel arch 1, as shown in Figure 5 (b) of

[0037] When the driving device 3 performs the second action (i.e., the shortening of the hydraulic cylinder): first, the mold body 2021 will move downward and abut against the top end position of the mold base 2022 (returning to the initial state at this time). When the driving device 3 continues to shorten, at this time, one end of the piston rod of the hydraulic cylinder will pull the ejector pin assembly 4 upward, so that the ejector pin assembly 4 ejects and demolds the automobile wheel arch 1 in the mold body 2021.

[0038] In the above process, there may be such a problem, that is, when the driving device 3 drives the mold body 2021 to move upward, at this time, the ejector pin assembly 4 is stationary, and there may be other structures on the ejector pin assembly 4 that cooperate with the mold body 2021, which will interfere with the movement of the mold body 2021.

[0039] Therefore, to solve the above technical problems, in one embodiment of this application, as shown in Figure 5 , the mold body 2021 and the ejector pin assembly 4 are cooperated through a traction structure 8; it should be known that the ejector pin assembly 4 is a common ejecting structure in the mold field, which is composed of a top plate and a plurality of ejector pins installed on the top plate; and one end of the piston rod of the driving device 3 (i.e., the hydraulic cylinder) can be slidably cooperated with the ejector pin assembly 4 (top plate). In the above initial state, the top plate of the ejector pin assembly 4 slides to the lowest limit position relative to the driving device 3.

[0040] It can be understood that when the driving device 3 performs the first action, the traction structure 8 is in the locked state. At this time, the ejector pin assembly 4 can move upward synchronously with the die body 2021 under the action of the traction structure 8 (i.e., the top plate moves upward along one end of the piston rod of the hydraulic cylinder), as shown in Figure 5 (b) in it. That is to say, at this time, a relatively static state is maintained between the ejector pin assembly 4 and the die body 2021, and thus no interference will be caused to the upward movement of the die body 2021. Similarly, vice versa, when the driving device 3 performs the second action, at this time the traction structure 8 will be in the unlocked state, that is, when the driving device 3 drives the ejector pin assembly 4 to move upward, at this time the die body 2021 will remain stationary to realize the demolding of the product.

[0041] The present application does not limit the specific structure of the traction structure 8. The following provides a specific embodiment for description:

[0042] The traction structure 8 includes a traction rod 801 and a traction sleeve 802. The traction rod 801 is installed on the die body 2021, the traction sleeve 802 is installed on the ejector pin assembly 4, and the traction rod 801 and the traction sleeve 802 are in sliding fit. Specifically, as shown in Figure 7 (a), when the traction rod 801 and the traction sleeve 802 are relatively far apart to the extreme state, at this time the traction structure 8 is in the locked state; and when the traction rod 801 and the traction sleeve 802 can slide relative to each other, at this time the traction structure 8 is in the unlocked state.

[0043] To facilitate the understanding of the demolding process of the product, the following describes its working principle:

[0044] In the initial state, as shown in Figure 5 (a), at this time the driving device 3 (hydraulic cylinder) extends, and one end of the piston rod of the hydraulic cylinder abuts against the bottom end position of the mold base 2022. Then, under the supporting action of the mold base 2022, the die body 2021 will move upward and away from the mold base 2022 under the driving of the extension of the driving device 3. Of course, at this time the ejector pin assembly 4 can move upward synchronously with the die body 2021 under the action of the (locked) traction structure 8, and the first forming assembly 5 is fixedly installed on the mold base 2022, which is equivalent to the rib 101 of the first forming assembly 5 and the wheel arch 1 of the vehicle being pulled out, as shown in Figure 5 (b). When the driving device 3 performs the second action (i.e., the shortening of the hydraulic cylinder): First, the die body 2021 will move downward and abut against the top end position of the mold base 2022 (at this time it returns to the initial state), as shown in Figure 6 (c); when the driving device 3 continues to shorten, at this time one end of the piston rod of the hydraulic cylinder will drive the ejector pin assembly 4 to be pulled upward, so that the ejector pin assembly 4 ejects and demolds the wheel arch 1 in the die body 2021, as shown in Figure 6 (d), thus completing the demolding process of the entire product.

[0045] In one embodiment of the present application, as Figure 4 shown, since the product itself is relatively large, a plurality of gates 7 can be provided at the lower mold 202. The gates 7 are close to the rib position 101 and are located at the side position of the product to ensure that during the injection molding process, the molten plastic can be evenly filled into all corners of the mold. The design of the plurality of gates 7 not only improves the production efficiency but also helps to reduce the stress concentration inside the product, thereby further improving the overall quality of the product.

[0046] Furthermore, as Figure 8 and Figure 9 shown, the injection mold for the automobile wheel arch further includes a plurality of second molding components 6. The second molding components 6 are horizontally slidably mounted on the lower mold 202 and cooperate with the lower mold 202 to form a runner 9 that cooperates with the gate 7. That is to say, the molten material enters the runner 9 from the gate 7 and then enters the cavity of the lower mold 202 from the runner 9; and the second molding components 6 cooperate with the upper mold 201 through a guiding structure.

[0047] Specifically, the guiding structure includes an inclined guide post and an inclined guide groove. The inclined guide post is mounted on the upper mold 201, and the inclined guide groove is provided on the second molding component 6; when the mold is opened, the inclined guide post moves upward, and the second molding component 6 can horizontally slide away from the automobile wheel arch 1 (product) under the inclined sliding cooperation of the inclined guide post and the inclined guide groove.

[0048] It should be known that through the design of the runner 9, during the later process of product molding, the molten material in the runner 9 will also cool and solidify to form a part of the product. At this time, the runner 9 can also play the role of a "riser", which can further perform a feeding function on the product (mainly at the rib position 101), and at the same time has the functions of preventing shrinkage cavities, shrinkage porosity, exhaust, and slag collection. And through the action of the guiding structure, it can be ensured that the second molding component 6 is separated from the solidified runner 9 when the mold is opened, thereby greatly improving the demolding effect of the product.

[0049] As we know, in an injection mold, the molten material generally flows into the gate 7 of the lower mold 202 from top to bottom, so that a relatively large impact force will be generated by the molten material, which will further affect the subsequent product molding quality. Therefore, as Figure 9As shown, in the present application, the runner 9 can be divided into a connected buffer section 902 and a vertical section 901. The first end of the buffer section 902 is connected to the gate 7, the second end of the buffer section 902 is communicated with the bottom end of the vertical section 901, and the top end of the vertical section 901 is communicated with the cavity of the lower mold 202. Such a design can effectively reduce the impact force when the molten material flows into the cavity. The setting of the buffer section 902 enables the molten material to decelerate and disperse to a certain extent before entering the vertical section 901, thereby reducing the direct impact on the cavity. The vertical section 901 ensures that the molten material can smoothly enter the cavity while maintaining sufficient pressure to ensure filling in the cavity.

[0050] Furthermore, in order to make the impact force of the molten material smaller, the buffer section 902 includes a horizontal portion 9022 and a vertical portion 9021. The first end of the horizontal portion 9022 forms the first end of the buffer section 902, the second end of the horizontal portion 9022 is communicated with the top end of the vertical portion 9021, and the bottom end of the vertical portion 9021 forms the second end of the buffer section 902, that is, the bottom end of the vertical portion 9021 is communicated with the bottom end of the vertical section 901. The setting of the horizontal portion 9022 enables the molten material to be further dispersed and decelerated before entering the vertical portion 9021, thereby further reducing the impact force on the cavity. Through this design, the molten material has been fully buffered before entering the cavity, ensuring the stability of the molding process and the quality of the product.

[0051] Even further, as Figure 10 shown, the conduction area of the vertical section 901 increases from top to bottom. That is to say, the molten material enters from the lower end of the vertical section 901 and then enters the cavity from the upper end. The conduction area of the vertical section 901 gradually decreases, and further, it can make the molten material have a certain pressure after entering the cavity, thereby ensuring that the molten material in the cavity can be evenly filled and avoiding molding defects caused by insufficient pressure. This design not only improves the molding quality of the product but also helps to reduce the stress concentration phenomenon caused by uneven molten material flow.

[0052] The above describes the basic principle, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. An injection mold for a car wheel eyebrow, characterized in that: include: A mold body having an upper mold and a lower mold; A driving device, the driving device is installed on the lower mold; an ejector assembly, the ejector assembly being mounted on the lower mold and connected to the driving device; and A first molding component, which is installed in the lower mold and is used to mold the ribs of the automobile wheel eyebrow; after the mold is opened: When the driving device performs a first action, the first molding component is suitable for being separated from the rib position of the automobile wheel arch under the action of the driving device; when the driving device performs a second action, the driving device is suitable for ejecting the automobile wheel arch in the lower mold cavity through the ejector pin assembly.

2. The injection mold for the automobile fender as claimed in claim 1, characterized in that: The lower mold includes a mold frame and a mold body, the mold body is vertically slidably installed on the top of the mold frame, the ejector assembly is vertically slidably installed in the mold frame, the driving device is installed on the mold body and the output end is matched and connected with the ejector assembly, and the first molding assembly is installed on the top of the mold frame and matched with the mold body; When the driving device performs the first action, the mold body is suitable for being driven by the driving device to move upward and away from the mold frame, thereby causing the first molding component to be separated from the rib position of the automobile wheel arch; when the driving device performs the second action, the ejector pin assembly is suitable for being driven by the driving device to move upward relative to the mold body and eject the automobile wheel arch.

3. The injection mold for the automobile wheel eyebrow according to claim 2, characterized in that: The mold body and the ejector assembly cooperate with each other through a traction structure; when the driving device performs a first action, the traction structure is in a locked state, and at this time, the ejector assembly is suitable for synchronously moving up with the mold body under the action of the traction structure.

4. The injection mold for the automobile wheel eyebrow according to claim 3, characterized in that: The traction structure includes a traction rod and a traction sleeve, wherein the traction rod is mounted on the mold body, and the traction sleeve is mounted on the ejector assembly, and the traction rod and the traction sleeve are slidably matched; when the driving device performs the first action, the traction rod and the traction sleeve are in an extreme separation state.

5. The injection mold for the automobile fender according to any one of claims 1 to 4, characterized in that: The lower mold is provided with a plurality of gates, and the gates are located near the side positions of the rib positions.

6. The injection mold for the automobile fender as claimed in claim 5, characterized in that: The injection mold for the automobile wheel eyebrow also includes a plurality of second molding components, which are horizontally slidably installed on the lower mold to cooperate with the lower mold and form a flow channel that cooperates with the gate, and the second molding components cooperate with the upper mold through a guide structure.

7. The injection mold for the automobile fender as claimed in claim 6, characterized in that: The guide structure includes an inclined guide column and an inclined guide groove, wherein the inclined guide column is installed on the upper mold, and the inclined guide groove is arranged on the second molding component; when opening the mold, the second molding component is suitable for sliding horizontally and away from the automobile wheel arch under the inclined sliding cooperation of the inclined guide column and the inclined guide groove.

8. The injection mold for the automobile fender as claimed in claim 7, characterized in that: The runner includes a buffer section and a vertical section, the first end of the buffer section is connected to the gate, the second end of the buffer section is connected to the bottom end of the vertical section, and the top end of the vertical section is connected to the lower mold cavity.

9. The injection mold for the automobile fender as claimed in claim 8, characterized in that: The buffer section includes a horizontal portion and a vertical portion, the first end of the horizontal portion forms the first end of the buffer section, the second end of the horizontal portion is connected to the top end of the vertical portion, and the bottom end of the vertical portion forms the second end of the buffer section.

10. The injection mold for the automobile fender as claimed in claim 8, characterized in that: The conduction area of ​​the vertical section increases gradually from top to bottom.

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