Sliding block type demolding pitched roof mold and demolding method

Abstract

The invention discloses a split type slide block pitched roof which comprises a front mold and a rear mold, a shovel base moving along with the front mold is arranged on the front mold, an ejection mechanism is arranged on the rear mold, slide blocks are arranged on the left side and the right side of the shovel base in a sliding and clamping mode, and first supporting molded surfaces are arranged on the sides, close to parts, of the slide blocks. An inclined top is slidably spliced on one side of each sliding block, a second supporting molded surface is arranged on the side, close to the part, of each inclined top, and the shovel base can drive the sliding blocks on the two sides to slide in the direction close to the inclined tops or away from the inclined tops when moving along with the front mold, so that the first supporting molded surfaces and the second supporting molded surfaces are spliced or separated; the bottom of the pitched roof is connected with the ejection mechanism; the ejection mechanism is used for driving the pitched roof to eject a part; in the demolding process, through pre-movement of the sliding block, the sliding block and a buckle, a supporting rib piece and the like on the inner side of a part are demolded firstly, then the coating force of the part on the inclined ejector is reduced, then the part is ejected and demolded through the inclined ejector, and it is guaranteed that the part is smoothly demolded, and meanwhile, the part cannot be strained.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic molds, and particularly relates to a slider type demolding angled ejector mold and a demolding method. Background Art

[0002] In the process of plastic mold design, especially for products such as automotive mold columns, taking the B-pillar as a typical example, there are many structures such as buckles and supporting rib plates arranged on the inner side of the part. During the injection molding process, the buckles and supporting rib plates will adhere tightly to the grooves on the angled ejector over a large area, resulting in too much wrapping force of the positions of the buckles and supporting rib plates on the angled ejector. Therefore, in the process of directly pushing the part for demolding by using the existing angled ejector structure, due to the tight adhesion of the positions such as the buckles and supporting rib plates to the angled ejector, it will cause problems of product scratches on the part at the positions of the buckles, supporting rib plates and their surrounding areas, thus affecting the quality of the part and even causing the scrapping of the part.

[0003] Therefore, aiming at the defect that the existing angled ejector is prone to cause scratches at the positions such as the buckles and supporting rib plates on the inner side of the part during the process of pushing and demolding the part, the present invention discloses a slider type demolding angled ejector mold and a demolding method. Summary of the Invention

[0004] The present invention discloses a slider type demolding angled ejector mold and a demolding method, which can, during the demolding process, through the pre-movement of the slider, enable the slider to be demolded first from the buckles, supporting rib plates, etc. on the inner side of the part, thereby reducing the wrapping force of the part on the angled ejector, and then use the angled ejector to push and demold the part, ensuring the smooth demolding of the part without causing scratches on the part.

[0005] The present invention is realized through the following technical solutions: A slider type demolding angled ejector mold, comprising a front mold and a rear mold. A lifter base that moves along with the front mold is arranged on the front mold, and an ejection mechanism is arranged on the rear mold. Sliders are slidably engaged on the left and right sides of the lifter base. A first supporting surface is arranged on the side of the slider close to the part; an angled ejector is slidably joined on one side of the slider, and a second supporting surface is arranged on the side of the angled ejector close to the part. When the lifter base moves along with the front mold, it can drive the sliders on both sides to slide towards or away from the angled ejector, so that the first supporting surface and the second supporting surface are joined or separated; the bottom of the angled ejector is connected to the ejection mechanism, and the ejection mechanism is used to drive the angled ejector to eject the part.

[0006] To better implement the present invention, further, a horizontal guiding portion extending towards the shovel base is provided at the top of the inclined ejector, and the bottom of the slider is slidably connected to the horizontal guiding portion; a second contact inclined surface is provided at one end of the slider away from the shovel base with respect to the horizontal guiding portion, and a first contact inclined surface is provided at one end of the slider away from the shovel base. When the slider slides to the extreme position in the direction away from the shovel base, the first contact inclined surface can contact and fit with the second contact inclined surface, and when the slider slides in the direction towards the shovel base, the first contact inclined surface can gradually separate from the second contact inclined surface.

[0007] To better implement the present invention, further, an elastic reset member is provided on the side of the slider close to the inclined ejector, and a sliding limiting member is provided on the side of the slider close to the shovel base.

[0008] To better implement the present invention, further, a pressing block is provided between the bottom of the slider and the top of the inclined ejector. A horizontal guiding groove is formed between the pressing block and the side surface of the top of the inclined ejector, and the bottom of the slider is slidably connected to the horizontal guiding groove; an elastic reset member is provided at one end of the horizontal guiding groove close to the inclined ejector, one end of the elastic reset member is connected to the inclined ejector, and the other end of the elastic reset member is connected to the slider; a sliding limiting member is provided at one end of the horizontal guiding groove close to the shovel base, the bottom of the sliding limiting member is connected to the side of the inclined ejector close to the shovel base, and the top of the limiting member is used to limit the sliding stroke of the slider.

[0009] To better implement the present invention, further, the elastic reset member includes an auxiliary spring provided between the inclined ejector and the side of the slider away from the shovel base; the sliding limiting member includes a limiting block provided on the side of the inclined ejector close to the shovel base.

[0010] To better implement the present invention, further, dovetail bosses with opposite inclination directions are provided on the left and right sides of the shovel base, and dovetail grooves that are inclined and slidably matched with the dovetail bosses are provided on the side of the slider close to the shovel base.

[0011] A slider demolding method, when the shovel base drives the slider to slide to the extreme position in the direction towards the part, the first supporting surface and the second supporting surface are butted and combined to form an integral supporting surface; during the process of the shovel base driving the slider to slide in the direction away from the part, the first supporting surface is separated from the part before the second supporting surface, and then the inclined ejector is driven to eject obliquely by the ejecting mechanism to drive the second supporting surface to eject the part obliquely for demolding.

[0012] To better implement the present invention, further, it specifically includes the following steps: Step 1: The front mold and the rear mold are closed. The front mold drives the shovel base to extrude the slider, causing the slider to slide towards the direction close to the inner surface of the part to the limit position, ensuring that the first support surface and the second support surface are butted and joined to form an integral support surface, and then the part is injection molded. Step 2: After the part is cooled and solidified, the front mold and the rear mold are separated. The front mold drives the shovel base to extrude the slider in the reverse direction, causing the slider to slide away from the inner surface of the part at the first rate, so that the first support surface separates from the inner surface of the part before the second support surface. Step 3: The ejection mechanism pushes the angled ejector obliquely upward, causing the angled ejector to push the part obliquely upward to the demolding position. Then the ejection mechanism drives the angled ejector to retract obliquely downward, realizing the separation of the inner surface of the part from the second support surface and achieving the complete demolding of the part.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: During the demolding process, the present invention can drive the sliders on both sides to move away from the angled ejector in advance through the dovetail groove matching structure on both sides of the shovel base, so that the sliders are separated from the buckles and support ribs on the inner side of the part first, thereby reducing the wrapping force of the part on the angled ejector. Then, the angled ejector is driven by the ejector pin to push the part for subsequent demolding, ensuring the smooth demolding of the part and avoiding scratches on the inner side of the part at the positions of the buckles, support ribs and their peripheries, effectively guaranteeing the quality of the finished product. Description of the Drawings

[0014] Figure 1 It is a three-dimensional structural schematic diagram of a slider type demolding angled ejector mold; Figure 2 It is a sectional structural schematic diagram of a slider type demolding angled ejector mold; Figure 3 It is a schematic diagram of the cooperative installation of the slider and the angled ejector; Figure 4 It is a structural schematic diagram of the shovel base; Figure 5 It is a structural schematic diagram of the slider; Figure 6 It is a structural schematic diagram of the angled ejector.

[0015] Wherein: 1 - shovel base; 2 - slider; 3 - angled ejector; 4 - ejection mechanism; 5 - pressing block; 11 - dovetail boss; 21 - dovetail groove; 31 - horizontal guiding groove; 100 - first contact inclined surface; 200 - second contact inclined surface; 300 - auxiliary spring; 400 - limiting block; 111 - first support surface; 222 - second support surface. Detailed Embodiments

[0016] Embodiment 1: This embodiment discloses a slider type demolding angled ejector mold, as Figures 1 - 3As shown, it includes a front mold and a rear mold, which are not shown in the figure. A lifter base 1 that moves with the front mold is provided on the front mold, and an ejection mechanism 4 is provided on the rear mold. Slide blocks 2 are slidably engaged on the left and right sides of the lifter base 1, and a first support surface 111 is provided on the side of the slide block 2 close to the part. A lifter 3 is slidably joined on one side of the slide block 2, and a second support surface 222 is provided on the side of the lifter 3 close to the part. When the lifter base 1 moves with the front mold, it can drive the slide blocks 2 on both sides to slide towards or away from the lifter 3, so that the first support surface 111 and the second support surface 222 are joined or separated. The bottom of the lifter 3 is connected to the ejection mechanism 4, and the ejection mechanism 4 is used to drive the lifter 3 to eject the part.

[0017] Forming grooves are provided on the first support surface 111 and the second support surface 222 corresponding to the structures such as buckles and support ribs on the inner surface of the part. When the front mold and the rear mold are closed, the dovetail groove matching structure on both sides of the lifter base 1 presses the slide block 2 and drives the slide block 2 to move towards the direction close to the inner surface of the part, so that the first support surface 111 and the second support surface 222 are butted and joined to form an integral support surface, and then injection molding can be carried out inside the mold. After the part is formed, the front mold and the rear mold are separated, and the front mold drives the lifter base 1 to move away from the rear mold, so that the dovetail groove matching structure on the left and right sides of the lifter base 1 reversely presses the slide block 2, driving the slide block 2 to move away from the inner surface of the part, thereby separating the first support surface 111 from the buckles and support ribs on the inner surface of the part in advance, reducing the adhesive contact area between the inner surface of the part and the mold, and further reducing the wrapping force of the part on the mold. Then the ejection mechanism 4 drives the lifter 3 to eject obliquely upward, driving the part to demold, so that the inner surface of the part is separated from the second support surface 222, and the complete demolding of the part is realized.

[0018] By the way that the first support surface 111 is separated from the inner surface of the part in advance, the adhesive area between the inner surface of the part and the mold is reduced, and the wrapping force of the part on the mold is reduced. Therefore, during the demolding process of the part, deformation, stretching and fracture will not occur at the positions of the buckles and support ribs.

[0019] Embodiment 2: This embodiment is further optimized on the basis of Embodiment 1, such as Figure 3As shown, a horizontal guiding portion extending towards the shovel base 1 is provided at the top of the lifter 3, and the bottom of the slider 2 is slidably connected to the horizontal guiding portion; a second contact inclined surface 200 is provided at one end of the slider 2 away from the shovel base 1 with respect to the horizontal guiding portion, and a first contact inclined surface 100 is provided at one end of the slider 2 away from the shovel base 1. The first contact inclined surface 100 can contact and fit with the second contact inclined surface 200 when the slider 2 slides to the extreme position in the direction away from the shovel base 1, and the first contact inclined surface 100 can gradually separate from the second contact inclined surface 200 when the slider 2 slides in the direction towards the shovel base 1. An elastic reset member is provided on one side of the slider 2 close to the lifter 3, and a sliding limiting member is provided on one side of the slider 2 close to the shovel base 1.

[0020] An elastic reset member is provided between the first contact inclined surface 100 and the second contact inclined surface 200. When the front mold and the rear mold are closed, the shovel base 1 presses the slider 2 towards the direction close to the inner side of the part on both the left and right sides, and the slider 2 presses the elastic reset member towards the direction close to the lifter 3, so that the elastic reset member is in a compressed state. After the front mold and the rear mold are separated and demolded, the shovel base 1 drives the sliders 2 on both the left and right sides to move away from the lifter 3. At the same time, the elastic reset member rebounds to apply an auxiliary elastic force to the slider 2, ensuring that the slider 2 can move away from the lifter 3 smoothly and effectively avoiding the situation of the slider 2 being stuck. At the same time, the sliding limiting member limits the sliding stroke of the slider 2 away from the lifter 3, avoiding the situation of mold collision caused by the slider 2 sliding over-position.

[0021] Other parts of this embodiment are the same as those of Embodiment 1, so they will not be described in detail.

[0022] Embodiment 3: This embodiment is further optimized on the basis of the above Embodiment 1 or 2, such as Figure 2 As shown, a pressing block 5 is provided between the bottom of the slider 2 and the top of the lifter 3. A horizontal guiding groove 31 is formed between the pressing block 5 and the side surface of the top of the lifter 3, and the bottom of the slider 2 is slidably connected to the horizontal guiding groove 31; an elastic reset member is provided at one end of the horizontal guiding groove 31 close to the lifter 3, one end of the elastic reset member is connected to the lifter 3, and the other end of the elastic reset member is connected to the slider 2; a sliding limiting member is provided at one end of the horizontal guiding groove 31 close to the shovel base 1, the bottom of the limiting member is connected to one side of the lifter 3 close to the shovel base 1, and the top of the limiting member is used to limit the sliding stroke of the slider 2.

[0023] By providing the pressing block 5 with a guiding inclined surface, only one horizontal dovetail groove needs to be machined on the lifter 3 at one time. The side walls on both sides of the horizontal dovetail groove cooperate with the guiding inclined surfaces on the pressing block 5 to form the horizontal guiding groove 31, ensuring the process rationality of the machining of the lifter 3.

[0024] Further, such asFigure 3 As shown, the elastic reset member includes an auxiliary spring 300 disposed between the lifter 3 and the side of the slider 2 away from the lifter base 1; the sliding limit member includes a limit block 400 disposed on the side of the lifter 3 close to the lifter base 1.

[0025] An auxiliary spring 300 is disposed between the first contact inclined surface 100 and the second contact inclined surface 200. When the front mold and the rear mold are clamped, the left and right sides of the lifter base 1 squeeze the slider 2 toward the inner side of the part, and the slider 2 squeezes the auxiliary spring 300 toward the lifter 3, causing the auxiliary spring 300 to be in a compressed state. After the front mold and the rear mold are separated and demolded, the lifter base 1 drives the sliders 2 on the left and right sides to move away from the lifter 3. At the same time, the auxiliary spring 300 rebounds to apply an auxiliary elastic force to the slider 2, ensuring that the slider 2 can move away from the lifter 3 smoothly and effectively avoiding the situation where the slider 2 is stuck. Other parts of this embodiment are the same as those of the above Embodiment 1 or 2, so they will not be described in detail.

[0026] Embodiment 4: This embodiment is further optimized on the basis of any one of the above Embodiments 1-3, such as Figure 4 and Figure 5 As shown, the left and right sides of the lifter base 1 are provided with dovetail bosses 11 with opposite inclination directions, and the side of the slider 2 close to the lifter base 1 is provided with a dovetail groove 21 that is inclined and slidably engaged with the dovetail boss 11.

[0027] The dovetail boss 11 on the left side of the lifter base 1 is arranged in the direction of inclining from top to bottom and rightward, and the dovetail boss 11 on the right side of the lifter base 1 is arranged in the direction of inclining from top to bottom and leftward. When the lifter base 1 is withdrawn from between the sliders 2 on the left and right sides along with the front mold, through the sliding fit between the dovetail boss 11 and the dovetail groove 21, an acting force away from the inner side of the part is applied to the sliders 2 on the left and right sides, causing the sliders 2 on the left and right sides to move closer to each other to be demolded from the snap or support rib on the inner side of the part. When the lifter base 1 is clamped with the front mold, through the sliding fit between the dovetail boss 11 and the dovetail groove 21, an acting force close to the inner side of the part is applied to the sliders 2 on the left and right sides, causing the sliders 2 on the left and right sides to move away from each other and reset for the next injection molding operation of the part.

[0028] Other parts of this embodiment are the same as those of any one of the above Embodiments 1-3, so they will not be described in detail.

[0029] Embodiment 5: This embodiment discloses a slider demolding method, which is realized based on the slider demolding lifter structure. When the lifter base 1 drives the slider 2 to slide towards the part to the limit position, the first support surface 111 and the second support surface 222 are butted and combined to form an integral support surface. During the process of the lifter base 1 driving the slider 2 to slide away from the part, the first support surface 111 is separated from the part before the second support surface 222, and then the lifter mechanism 4 drives the lifter 3 to eject obliquely to drive the second support surface 222 to eject the part obliquely for demolding.

[0030] Specifically, it includes the following steps: Step 1: The front mold and the rear mold are closed. The front mold drives the lifter base 1 to extrude the slider 2, so that the slider 2 slides towards the inner surface of the part to the limit position, ensuring that the first support surface 111 and the second support surface 222 are butted and combined to form an integral support surface, and then the part is injection molded. Step 2: After the part is cooled and solidified, the front mold and the rear mold are separated. The front mold drives the lifter base 1 to extrude the slider 2 in the reverse direction, so that the slider 2 slides away from the inner surface of the part at the first rate, and the first support surface 111 is separated from the inner surface of the part before the second support surface 222. Step 3: The lifter mechanism 4 pushes the lifter 3 obliquely upward, so that the lifter 3 ejects the part obliquely upward to the demolding position, and then the lifter mechanism 4 drives the lifter 3 to retract obliquely downward, realizing the separation of the inner surface of the part from the second support surface 222 and realizing the complete demolding of the part.

[0031] As mentioned above, it is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification and equivalent change made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A slider type ejection lifter mold, comprising a front mold and a rear mold, characterized in that, A lifter base (1) that moves with the front mold is provided on the front mold, an ejection mechanism (4) is provided on the rear mold, sliding blocks (2) are slidably engaged on the left and right sides of the lifter base (1), and a first supporting surface (111) is provided on the side of the sliding block (2) close to the part; a lifter (3) is slidably joined on one side of the sliding block (2), and a second supporting surface (222) is provided on the side of the lifter (3) close to the part. When the lifter base (1) moves with the front mold, it can drive the sliding blocks (2) on both sides to slide towards or away from the lifter (3), so that the first supporting surface (111) and the second supporting surface (222) are joined or separated; the bottom of the lifter (3) is connected to the ejection mechanism (4), and the ejection mechanism (4) is used to drive the lifter (3) to eject the part.

2. The slider type ejection lifter mold according to claim 1, wherein, A horizontal guiding portion extending towards the lifter base (1) is provided at the top of the lifter (3), and the bottom of the sliding block (2) is slidably connected with the horizontal guiding portion; a second contact inclined surface (200) is provided at the end of the sliding block (2) where the horizontal guiding portion is away from the lifter base (1), and a first contact inclined surface (100) is provided at the end of the sliding block (2) away from the lifter base (1). The first contact inclined surface (100) can contact and join with the second contact inclined surface (200) when the sliding block (2) slides towards the limit position away from the lifter base (1), and the first contact inclined surface (100) can gradually separate from the second contact inclined surface (200) when the sliding block (2) slides towards the lifter base (1).

3. The slider type ejection lifter mold according to claim 2, characterized in that, An elastic resetting member is provided on the side of the sliding block (2) close to the lifter (3), and a sliding limiting member is provided on the side of the sliding block (2) close to the lifter base (1).

4. A slider type ejection lifter mold according to claim 3, characterized in that, A pressing block (5) is provided between the bottom of the sliding block (2) and the top of the lifter (3), a horizontal guiding groove (31) is formed between the pressing block (5) and the side surface of the top of the lifter (3), and the bottom of the sliding block (2) is slidably connected with the horizontal guiding groove (31); an elastic resetting member is provided at the end of the horizontal guiding groove (31) close to the lifter (3), one end of the elastic resetting member is connected to the lifter (3), and the other end of the elastic resetting member is connected to the sliding block (2); a sliding limiting member is provided at the end of the horizontal guiding groove (31) close to the lifter base (1), the bottom of the limiting member is connected to the side of the lifter (3) close to the lifter base (1), and the top of the limiting member is used to limit the sliding stroke of the sliding block (2).

5. The slider type ejection lifter mold according to claim 4, wherein The elastic resetting member includes an auxiliary spring (300) provided between the lifter (3) and the side of the sliding block (2) away from the lifter base (1); the sliding limiting member includes a limiting block (400) provided on the side of the lifter (3) close to the lifter base (1).

6. A slider type ejection lifter mold according to claim 5, characterized in that, Dovetail bosses (11) with opposite inclination directions are provided on the left and right sides of the lifter base (1), and dovetail grooves (21) that are inclined and slidably engaged with the dovetail bosses (11) are provided on the side of the sliding block (2) close to the lifter base (1).

7. A slider demolding method, implemented based on the slider demolding lifter die according to any one of claims 1-6, characterized in that, When the shovel base (1) drives the slider (2) to slide towards the part to the limit position, the first supporting surface (111) and the second supporting surface (222) are butted and joined to form an integral supporting surface; during the process of the shovel base (1) driving the slider (2) to slide away from the part, the first supporting surface (111) separates from the part prior to the second supporting surface (222), and then the ejecting mechanism (4) drives the lifter (3) to eject obliquely to drive the second supporting surface (222) to eject the part obliquely for demolding.

8. A slider demolding method according to claim 7, characterized in that, Specifically, it includes the following steps: Step 1: The front mold and the rear mold are closed. The front mold drives the shovel base (1) to squeeze the slider (2), so that the slider (2) slides towards the inner surface of the part to the limit position, ensuring that the first supporting surface (111) and the second supporting surface (222) are butted and joined to form an integral supporting surface, and then the part is injection molded. Step 2: After the part is cooled and solidified, the front mold and the rear mold are separated. The front mold drives the shovel base (1) to reversely squeeze the slider (2), so that the slider (2) slides away from the inner surface of the part at the first rate, and the first supporting surface (111) separates from the inner surface of the part prior to the second supporting surface (222). Step 3: The ejecting mechanism (4) pushes the lifter (3) obliquely upwards, so that the lifter (3) ejects the part obliquely upwards to the demolding position, and then the ejecting mechanism (4) drives the lifter (3) to retract obliquely downwards, realizing the separation of the inner surface of the part from the second supporting surface (222) and completely demolding the part.

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