Secondary core-pulling mold device and production method thereof

Abstract

The present invention discloses a secondary core-pulling mold device and a production method thereof. The secondary core-pulling mold device comprises a mold mechanism and two core-pulling mechanisms. The first core-pulling mechanism comprises a first mold core, a first driving mechanism and a connecting portion. The first mold core is driven to slide by the first driving mechanism, and the first mold core located at the first molding position extends into the mold cavity and molds a concave-convex structure of the product. The second core-pulling mechanism comprises a second mold core, a second driving mechanism and a second slider. The second slider is slidably connected to the connecting portion. The second mold core passes through the first mold core and is driven to slide by the second driving mechanism. The second mold core located at the second molding position extends into the mold cavity and molds a concave hole on the concave-convex structure. It has the following advantages: when the second core-pulling mechanism pulls the core, the product can be positioned by the first mold core to avoid product movement and improve the product yield. Afterwards, the first core-pulling mechanism pulls the core, and the friction force and the connection force between the product and the mold core are reduced because the first mold core has been pulled, further improving the product yield.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding parts and molding methods, and in particular to a secondary core-pulling mold device and a production method thereof. Background Art

[0002] Some existing products, such as Figure 1 and Figure 2 As shown, it includes a main body 1; the main body 1 has a convex wall, the convex wall is provided with a first concave-convex structure 11, and the first concave-convex structure 11 is also provided with a plurality of concave holes 12, such as a concave hole is provided on the convex end face; the lower end face of the main body 1 is also provided with a second concave-convex structure 13. When the product is produced by a mold forming method, since the convex wall is provided with not only the first concave-convex structure 11 but also a plurality of concave holes 12, a core pulling mechanism is required to pull the core to achieve demoulding, but the core pulling mechanism in the existing mold adopts a single core pulling, and the connection between the mold core and the product in the mold cavity is not easy to be separated in the single core pulling, and the product and the mold cavity will move and rub, resulting in an increase in the scrap rate, so there is a need for further improvement. Summary of the invention

[0003] The invention provides a secondary core-pulling mold device and a production method thereof, which overcomes the shortcomings of the mold device in the background technology.

[0004] One of the technical solutions adopted by the present invention to solve the technical problem is: a secondary core-pulling mold device, comprising:

[0005] A mold mechanism, with a mold cavity;

[0006] The first core-pulling mechanism comprises a first mold core, a first driving mechanism and a connecting portion mounted between the first driving mechanism and the first mold core, wherein the first mold core is driven by the first driving mechanism to slide relative to the mold mechanism between a first molding position and a first core-pulling position, and the first mold core at the first molding position extends into the mold cavity and forms a concave-convex structure of the molded product;

[0007] The second core-pulling mechanism includes a second mold core, a second driving mechanism and a second slider installed between the second driving mechanism and the second mold core. The second slider is slidably connected to the connecting part. The second mold core passes through the first mold core and is driven by the second driving mechanism to slide relative to the first mold core between the second molding position and the second core-pulling position. The second mold core located at the second molding position extends into the mold cavity and forms a concave hole on the concave-convex structure.

[0008] In one embodiment, it also includes: an ejector mechanism, which is mounted on the mold mechanism and includes a slide seat and a first ejector mounted on the slide seat, and the first ejector extends into the mold cavity.

[0009] In one embodiment: the ejector mechanism further includes a second ejector, the first ejector is fixedly mounted on the slide seat, the lower end of the second ejector is rotatably connected to the slide seat, and the second ejector extends into the mold cavity.

[0010] In one embodiment: the mold mechanism includes an upper mold unit and a lower mold unit, and the upper mold unit and the lower mold unit are molded together to form the above-mentioned mold cavity; the upper mold unit includes an upper mold plate and an upper mold, and the upper mold plate and the upper mold can move relative to each other along the mold closing and mold splitting directions. The first core pulling mechanism is mounted on the upper mold, and the second driving mechanism includes an inclined top fixed to the upper mold plate and an inclined groove provided on the second slider. The inclined top and the inclined groove are slidably matched and drive the second slider to slide through the mold splitting of the upper mold plate and the upper mold to drive the second mold core to pull the core.

[0011] In one embodiment, the second mold core is fixedly mounted on the second slider, and the sliding direction of the second slider is perpendicular to the mold closing and parting directions.

[0012] In one embodiment: the mold mechanism includes an upper mold unit and a lower mold unit, and the upper mold unit and the lower mold unit are molded together to form the above-mentioned mold cavity; the upper mold unit includes an upper mold plate and an upper mold, and the first core pulling mechanism is attached to the upper mold; the first driving mechanism includes a cylinder mechanism, and the connecting part is fixedly connected between the piston of the cylinder mechanism and the first mold core, and the sliding direction of the first mold core is arranged perpendicular to the mold closing and parting direction.

[0013] In one embodiment: the upper template and the upper mold can move relative to each other along the mold closing and parting directions, the second driving mechanism includes an inclined top fixed on the upper template and an inclined groove provided on the first slider, the inclined top and the inclined groove are slidably matched and drive the first slider to slide through the mold parting of the upper template and the upper mold to drive the second mold core to pull out; the first slider is fixed at the end of the connecting part, the first mold core is fixed on the first slider, and the third slider located between the first slider and the second slider is also slidably connected on the connecting part, one end of the second mold core is fixed to the second slider, and the other end slides through the third slider, the first slider and the first mold core, and a limit seat is fixed under the upper template, and the limit seat is inserted between the first slider and the third slider.

[0014] In one embodiment: when the first mold core is in the first molding position and the second mold core is in the second molding position, and when the first mold core is in the first core-pulling position and the second mold core is in the second core-pulling position, the second slider and the third slider are in contact with each other.

[0015] In one embodiment: the mold mechanism includes an upper mold unit and a lower mold unit, the upper mold unit and the lower mold unit are molded together to form the above-mentioned mold cavity, the lower mold unit includes a lower mold plate and a lower mold attached to the lower mold plate, and the lower mold is provided with a fixed mold core.

[0016] The second technical solution adopted by the present invention to solve the technical problem is: the production method of the secondary core-pulling mold device comprises:

[0017] Step 1, closing the mold and forming a film cavity;

[0018] Step 2, injecting glue into the mold cavity to fill the mold cavity;

[0019] Step 3, driving the second mold core to pull out the core by the second driving mechanism, and positioning the product formed in the mold cavity by the first mold core and the ejector mechanism during the core pulling process;

[0020] Step 4, driving the first mold core to pull out the core through the first driving mechanism;

[0021] Step 5, mold separation;

[0022] Step 6: eject the product in the mold cavity through the ejector mechanism.

[0023] Compared with the background technology, this technical solution has the following advantages:

[0024] The first driving mechanism drives the first mold core to slide relative to the mold mechanism between the first molding position and the first core-pulling position, and the first mold core located at the first molding position extends into the mold cavity and forms a concave-convex structure of the product; the second mold core passes through the first mold core and is driven by the second driving mechanism to slide relative to the first mold core between the second molding position and the second core-pulling position, and the second mold core located at the second molding position extends into the mold cavity and forms a concave hole on the concave-convex structure. When the second core-pulling mechanism pulls the core, the product can be positioned by the first mold core to avoid product movement and improve the product yield. Afterwards, the first core-pulling mechanism pulls the core, and because the first mold core has been pulled, the friction and the connection force between the product and the mold core are reduced, thereby further improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Figure 1 It is one of the three-dimensional schematic diagrams of the product.

[0027] Figure 2 This is the second three-dimensional schematic diagram of the product.

[0028] Figure 3 It is a front view structural schematic diagram of the mold closing at the mold device of this specific embodiment.

[0029] Figure 4 It is a schematic diagram of the core pulling front view structure of the second core pulling mechanism of the mold device in this specific embodiment.

[0030] Figure 5 It is one of the schematic diagrams of the core pulling front view structure of the first core pulling mechanism of the mold device in this specific embodiment.

[0031] Figure 6 This is the second schematic diagram of the core pulling front view structure of the first core pulling mechanism of the mold device in this specific embodiment.

[0032] Figure 7It is a schematic diagram of the left view of the core pulling structure of the first core pulling mechanism of the mold device in this specific embodiment.

[0033] Figure 8 It is one of the schematic diagrams of the left-view structure of the mold device parting in this specific embodiment.

[0034] Fig. 9 This is the second schematic diagram of the left-side structure of the mold device splitting of this specific implementation method.

[0035] Fig.10 It is a structural schematic diagram of the first and second core-pulling mechanisms of the mold device in this specific embodiment.

[0036] Fig.11 It is a three-dimensional cross-sectional schematic diagram of the first and second core-pulling mechanisms of the mold device of this specific embodiment at the molding position.

[0037] Fig.12 It is a three-dimensional cross-sectional schematic diagram of the core pulling position of the second core pulling mechanism of the mold device in this specific embodiment.

[0038] Fig.13 It is a three-dimensional cross-sectional schematic diagram of the core pulling position of the first core pulling mechanism of the mold device of this specific embodiment. DETAILED DESCRIPTION

[0039] Please refer to Figure 1 and Figure 2 , a molded product, comprising a main body 1; the main body 1 has a convex wall, a first concave-convex structure 11 is arranged on the convex wall, a plurality of concave holes 12 are also arranged on the first concave-convex structure 11, such as a concave hole 12 is arranged on the end face of a convex column; a second concave-convex structure 13 is also arranged on the lower end face of the main body 1.

[0040] Please refer to Figures 3 to 13 The secondary core-pulling mold device includes a mold mechanism 2, a first core-pulling mechanism 3, a second core-pulling mechanism 4 and an ejector mechanism 5.

[0041] The mold mechanism 2 includes an upper mold unit and a lower mold unit. The upper mold unit includes an upper mold plate 21 and an upper mold 22. The upper mold plate 21 and the upper mold 22 can move relatively along the mold closing and parting directions. The lower mold unit includes a lower mold plate 23 and a lower mold 24. The lower mold plate 23 and the lower mold 24 are fixed together. The concave cavity of the upper mold 22 and the concave cavity of the lower mold 24 form a mold cavity 25 after the mold is closed. The lower mold 24 is provided with a fixed mold core.

[0042] The first core-pulling mechanism 3 includes a first mold core 31, a first driving mechanism 32, and a connecting portion 33 mounted between the first driving mechanism 32 and the first mold core 31. The first driving mechanism 32 drives the first mold core 31 to slide between the first molding position and the first core-pulling position relative to the upper mold unit. The first mold core 31 at the first molding position extends into the mold cavity 25 and molds the first concave-convex structure 11 of the product 1. The second core-pulling mechanism 4 includes a second mold core 41, a second driving mechanism, and a second slider 42 mounted between the second driving mechanism and the second mold core 41. The second slider 42 is slidably connected to the connecting portion 33. The second mold core 41 passes through the first mold core 31 and is driven by the second driving mechanism to slide between the second molding position and the second core-pulling position relative to the first mold core 31. The second mold core 41 at the second molding position extends into the mold cavity 25 and molds the concave hole 12 on the first concave-convex structure 11. When the second core-pulling mechanism pulls the core, the product 1 can be positioned by the first mold core to prevent the product 1 from moving, thereby improving the product yield rate. Afterwards, the first core-pulling mechanism pulls the core, and because the first mold core has been pulled, the friction force and the connection force between the product and the mold core are reduced, further improving the product yield rate.

[0043] In this specific embodiment: the first core-pulling mechanism 3 is attached to the upper mold 22, and the second driving mechanism includes an inclined top 26 fixed to the upper mold plate 21 and an inclined groove 43 provided on the second slider 42. The inclined top 26 and the inclined groove 43 are slidably matched and the second slider 42 is driven to slide along the connecting portion 33 by the mold separation of the upper mold plate 21 and the upper mold 22 to drive the second mold core 41 to pull the core. The second mold core 41 is fixed to the second slider 42, and the sliding direction of the second slider 42 is perpendicular to the mold closing and parting direction. The second core-pulling mechanism is driven to pull the core by the mold separation of the upper mold 22 and the upper mold plate 21, which saves the driving mechanism and has a compact structure. The first driving mechanism 32 includes a cylinder mechanism, and the connecting portion 33 is fixed between the piston of the cylinder mechanism and the first mold core 31. The sliding direction of the first mold core 31 is arranged perpendicular to the mold closing and parting direction. The first slider 34 is fixed at the end of the connecting portion 33, the first mold core 31 is fixed on the first slider 34, and the third slider 35 is slidably connected to the connecting portion 33 and located between the first slider 34 and the second slider 42. One end of the second mold core 41 is fixed to the second slider 42, and the other end slides through the third slider 35, the first slider 34 and the first mold core 31. A limit seat 27 is fixed at the bottom of the upper mold plate 21, and the limit seat 27 is inserted between the first slider 34 and the third slider 35. Moreover, when the first mold core 31 is in the first molding position and the second mold core 41 is in the second molding position, the second slider 42 and the third slider 35 touch each other, and the cavity between the first slider 34 and the third slider 35 is adapted to the limit seat 27, and when the first mold core 31 is in the first core pulling position and the second mold core 41 is in the second core pulling position, the second slider 42 and the third slider 35 touch each other. The above structure can improve the core pulling action design, improve the stability and reliability of the core pulling.

[0044] The ejector mechanism 5 is mounted on the lower mold unit and includes a slide 51, a first ejector 52 and a second ejector 53 mounted on the slide 51, the first ejector 52 is fixed on the slide 51, and the lower end of the second ejector 53 can be rotatably connected to the slide 51, the first ejector and the second ejector extend into the mold cavity, and the first ejector, the second ejector and the solid mold core cooperate to form the second concave-convex structure. The two ejectors can strengthen the positioning of the product 1 when the second core-pulling mechanism pulls the core, and can eject the product after mold separation.

[0045] The production method of the secondary core-pulling mold device comprises:

[0046] Step 1, the upper and lower mold units are molded together to form a film cavity 25;

[0047] Step 2, such as Figure 3 As shown, the glue is injected into the mold cavity 25 to fill the mold cavity 25 to form the product 1;

[0048] Step 3, such as Figure 3 and Figure 4 As shown, the upper mold plate 21 and the upper mold 22 are separated, and the second slider 42 and the second mold core 41 are driven to slide by the inclined ejector to realize core pulling. During the core pulling process, the first mold core 31 and the ejector mechanism 5 are used to position the product 1 formed in the mold cavity;

[0049] Step 4, such as Figure 4 , Figure 5 and Figure 6 As shown, the first mold core 31 is driven to pull out the core by the first driving mechanism;

[0050] Step 5, such as Figure 7 , Figure 8 and Fig. 9 As shown, the upper mold 22 and the lower mold 24 are split;

[0051] Step 6: eject the product in the mold cavity through the ejector mechanism.

[0052] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. Secondary core pulling mold device, characterized by: include: The mold mechanism is provided with a mold cavity; the mold mechanism comprises an upper mold unit and a lower mold unit, the upper mold unit and the lower mold unit are molded together to form the above-mentioned mold cavity; the upper mold unit comprises an upper mold plate and an upper mold, and the upper mold plate and the upper mold can move relatively along the mold closing and parting directions; the lower mold unit comprises a lower mold plate and a lower mold attached to the lower mold plate; The first core-pulling mechanism comprises a first mold core, a first driving mechanism and a connecting portion mounted between the first driving mechanism and the first mold core, wherein the first mold core is driven by the first driving mechanism to slide between the first molding position and the first core-pulling position relative to the mold mechanism, and the first mold core located at the first molding position extends into the mold cavity and forms a concave-convex structure of the molded product; the first core-pulling mechanism is mounted on the upper mold; the first driving mechanism comprises a cylinder mechanism, the connecting portion is fixedly connected between the piston of the cylinder mechanism and the first mold core, and the sliding direction of the first mold core is arranged perpendicular to the mold closing and parting direction; a first slider is fixedly arranged at the end of the connecting portion, and the first mold core is fixedly arranged on the first slider; and The second core-pulling mechanism comprises a second mold core, a second driving mechanism and a second slider mounted between the second driving mechanism and the second mold core, the second slider being slidably connected to the connecting portion, the second mold core passing through the first mold core and driven by the second driving mechanism to slide between the second molding position and the second core-pulling position relative to the first mold core, the second mold core located at the second molding position extends into the mold cavity and forms a concave hole on the concave-convex structure; the second driving mechanism comprises an inclined top fixed to the upper mold plate and an inclined groove provided on the second slider, the inclined top and the inclined groove are slidably matched and driven by the upper mold plate and the upper mold parting to slide the second slider to drive the second mold core to pull the core; the second mold core is fixedly mounted on the second slider, and the sliding direction of the second slider is perpendicular to the mold closing and parting direction; Among them: the connecting part is also slidably connected with a third slider located between the first slider and the second slider, one end of the second mold core is fixedly connected to the second slider, and the other end slides through the third slider, the first slider and the first mold core, and a limit seat is also fixedly provided under the upper mold plate, and the limit seat is inserted between the first slider and the third slider.

2. The secondary core-pulling mold device according to claim 1, characterized in that: Also includes: The ejector mechanism is mounted on the mold mechanism and includes a slide and a first ejector mounted on the slide, the first ejector extending into the mold cavity; the ejector mechanism also includes a second ejector, the first ejector is fixedly mounted on the slide, the lower end of the second ejector is rotatably connected to the slide, and the second ejector extends into the mold cavity; the lower mold is provided with a fixed mold core; the first ejector, the second ejector and the fixed mold core cooperate to form a second concave-convex structure of the molded product.

3. The secondary core-pulling mold device according to claim 1, characterized in that: When the first mold core is in the first molding position and the second mold core is in the second molding position, and when the first mold core is in the first core-pulling position and the second mold core is in the second core-pulling position, the second slider and the third slider are in contact with each other.

4. The production method of the secondary core-pulling mold device according to claim 1, characterized in that: include: Step 1, closing the mold and forming a film cavity; Step 2, injecting glue into the mold cavity to fill the mold cavity; Step 3, driving the second mold core to pull out the core by the second driving mechanism, and positioning the product formed in the mold cavity by the first mold core and the ejector mechanism during the core pulling process; Step 4, driving the first mold core to pull out the core through the first driving mechanism; Step 5, mold separation; Step 6: eject the product in the mold cavity through the ejector mechanism.

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