Demolding method for resin-embedded large-arc inverted steel column structures

Abstract

This invention relates to the technical field of molds and discloses a demolding method for a resin-embedded large-arc undercut steel column structure, comprising the following steps: 1) pressing the upper inner mold, the lower inner mold, and the positioning mold base together; 2) injecting resin raw material into the molding cavity; 3) after the large-arc resin product in the molding cavity is formed, separating the upper inner mold and the lower inner mold, and moving the upper inner mold upward to a set position; 4) driving the power shaft upward through the ejection device of the injection molding machine, so that the two opening mechanisms drive the steel column strip to carry the large-arc resin product to complete the entire undercut product release process; the steel column strip can reduce the contact area with the large-arc resin product. After the product is formed in the mold, the two opening mechanisms start to work. At this time, the two opening mechanisms will contact the swing bar and gradually open the steel column strip as the ejection proceeds, ensuring smooth demolding of the product and avoiding the steel column strip from scraping the mold.

Description

Technical Field

[0001] This invention relates to the technical field of molds, and more specifically, to a demolding method for resin-embedded large-arc inverted steel column structures. Background Technology

[0002] Injection molding of resin products requires the creation of molds. When the structure of the resin product has a large curvature, if there is an internal undercut in the middle of the resin product, the traditional method is to use a stripper plate to push the resin product outward from all sides, while the ejector pin in the middle pushes the internal undercut of the resin product to force it outward. However, because the structure of the resin product has a large curvature, the internal undercut needs to have the ability to deform in order to release. If the internal undercut does not deform and is forced outward, it will break, which will not only affect the quality of the product, but also cause the product to be scrapped, and will also affect the next casting. Summary of the Invention

[0003] The purpose of this invention is to provide a demolding method for resin-embedded large-arc inverted steel column structures, aiming to solve the problem in the prior art that large-arc resin products cannot be successfully demolded during the demolding process.

[0004] This invention is implemented as follows: a demolding method for resin-embedded large-arc inverted steel column structures includes the following steps:

[0005] 1) Press the upper inner mold, the lower inner mold, and the positioning mold base together. The upper inner mold and the lower inner mold form a molding cavity for injection molding of raw materials. A steel column with a large arc and elastic deformation is embedded in the bottom of the molding cavity. The two ends of the steel column extend outward from the molding cavity and bend to form swing strips.

[0006] 2) Two side-by-side, relatively spaced-apart support mechanisms are installed in the lower inner mold, and the two swing bars are respectively inserted into the two support mechanisms; resin raw material is injected into the molding cavity;

[0007] 3) After the large-arc resin product in the molding cavity is formed, separate the upper inner mold and the lower inner mold, and move the upper inner mold upward to the set position;

[0008] 4) The positioning mold base is provided with a power shaft. The bottom of the power shaft is exposed outside the bottom of the positioning mold base. The top of the power shaft is inserted into the lower inner mold. The top two sides of the power shaft abut against two opening mechanisms respectively. The power shaft is driven to move upward by the ejection device of the injection molding machine.

[0009] This allows the two opening mechanisms to drive the two swing bars to open to both sides, thereby allowing the steel column to carry the large-arc resin product to complete the entire process of inverted release from the product.

[0010] Furthermore, in step 1), the positioning mold base has a hollowed-out mounting groove, the bottom of the lower inner mold is inserted into the bottom of the mounting groove, the upper inner mold is located in the mounting groove, the inner sidewall of the mounting groove is concave to form a wire groove, and the upper part of the swing bar abuts against the inner sidewall of the wire groove.

[0011] Furthermore, the upper inner mold is provided with a nozzle, the bottom of which extends through the upper inner mold from top to bottom, and the nozzle is connected to the molding cavity.

[0012] Furthermore, in step 1), the two swing bars are arranged facing each other and inclined downwards away from the steel column bars.

[0013] Furthermore, in step 2), the spreading mechanism includes a fixed base, a spreading block, and a limiting screw. A first return spring arranged laterally is connected between the fixed base and the spreading block. The limiting screw passes through the fixed base and is connected to the spreading block. The lower part of the swing bar is inserted into the spreading block.

[0014] The two spreading blocks in the spreading mechanism respectively abut against the top two sides of the power shaft.

[0015] Furthermore, one end of the limiting screw extends laterally through one side of the fixed base and passes through the first reset spring, and is threadedly connected to the spreading block, while the other end of the limiting screw protrudes from the other side of the fixed base.

[0016] Furthermore, in step 2), one end of the swing bar is connected to the steel column bar, and the other end of the swing bar bends downward to form a deflection bar, and the two deflection bars of the two swing bars are arranged inclined downward towards each other.

[0017] The fixed base has an inwardly recessed positioning groove, and the offset strip is inserted obliquely into the positioning groove.

[0018] Furthermore, in step 1), a plurality of positioning clamping blocks are provided on the bottom of the forming mold cavity, and the plurality of positioning clamping blocks are arranged sequentially at intervals along the length direction of the steel column, and the plurality of positioning clamping blocks are respectively clamped on the steel column.

[0019] Furthermore, in step 4), a positioning lock block is provided in the lower inner mold, and the positioning lock block has a positioning groove arranged in a hollow manner, with the upper part of the swing bar located in the positioning groove.

[0020] Furthermore, in step 4), the positioning mold base is provided with a movable seat that moves up and down, the power shaft is connected to the movable seat, and the top of the movable seat is provided with a plurality of second return springs. The plurality of second return springs are arranged circumferentially around the top of the movable seat at intervals, the bottom of the second return springs abuts against the top of the movable seat, and the top of the second return springs abuts against the inner sidewall of the top of the positioning mold base.

[0021] The positioning mold base is provided with a plurality of vertically arranged guide columns, which are arranged at intervals around the circumference of the movable base and penetrate the movable base.

[0022] Compared with existing technologies, the demolding method for resin-embedded large-arc inverted steel column structures provided by this invention reduces the contact area between the steel column and the large-arc resin product. Furthermore, the elastic deformation of the steel column assists in demolding. Two supporting mechanisms simultaneously expand the steel column during ejection. Specifically, after the product is formed in the mold, the two supporting mechanisms begin to operate. At this time, the two supporting mechanisms contact the swing bar and gradually expand the steel column as ejection progresses, ensuring smooth demolding and preventing the steel column from scraping the mold. This solves the problem of large-arc resin products being unable to demold smoothly during the demolding process. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the demolding method for resin-embedded large-arc inverted steel column structure provided by the present invention;

[0024] Figure 2 This is a three-dimensional schematic diagram of the upper inner mold, lower inner mold, and positioning mold base provided by the present invention;

[0025] Figure 3 This is a three-dimensional schematic diagram of the lower inner mold and the positioning mold base provided by the present invention;

[0026] Figure 4 This is a frontal sectional view of the lower inner mold and positioning mold base provided by the present invention;

[0027] Figure 5 This is a three-dimensional exploded view of the spreading mechanism provided by the present invention;

[0028] Figure 6 This is a top view of the toggle block provided by the present invention.

[0029] In the figure: upper inner mold 10, lower inner mold 20, positioning mold base 30, spreading mechanism 40, forming mold cavity 50, steel column 60, power shaft 70, nozzle 11, positioning lock block 21, positioning slide groove 22, toggle block 23, guide groove 24, hemisphere 25, mounting groove 31, wire groove 32, moving seat 33, second return spring 34, guide column 35, fixed seat 41, spreading block 42, limit screw 43, first return spring 44, positioning groove 45, facing end face 46, positioning clamp block 51, swing bar 61, deviation bar 62, inclined top surface 71. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0032] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0033] Reference Figure 1-6 The image shows a preferred embodiment of the present invention.

[0034] The demolding method for resin-embedded large-radius inverted steel column structures includes the following steps:

[0035] 1) Press the upper inner mold 10, the lower inner mold 20 and the positioning mold base 30 together. The upper inner mold 10 and the lower inner mold 20 enclose a molding cavity 50 for injection molding of raw materials. A steel column 60 with a large arc and elastic deformation is embedded in the bottom of the molding cavity 50. The two ends of the steel column 60 extend outward from the molding cavity 50 and bend to form a swing strip 61.

[0036] 2) Two supporting mechanisms 40 are installed in the lower inner mold 20, arranged side by side and spaced apart. Two swing bars 61 are respectively inserted into the two supporting mechanisms 40; resin raw material is injected into the molding cavity 50.

[0037] 3) After the large-arc resin product in the molding cavity 50 is formed, separate the upper inner mold 10 and the lower inner mold 20 from the mold, and move the upper inner mold 10 upward to the set position.

[0038] 4) A power shaft 70 is provided in the positioning mold base 30. The bottom of the power shaft 70 is exposed outside the bottom of the positioning mold base 30. The top of the power shaft 70 is inserted into the lower inner mold 20. The top two sides of the power shaft 70 abut against the two opening mechanisms 40 respectively. The power shaft 70 is driven to move upward by the ejection device of the injection molding machine.

[0039] This allows the two opening mechanisms 40 to drive the two swing bars 61 to open to both sides, thereby allowing the steel column bar 60 to drive the large-arc resin product to complete the entire process of inverted release from the product.

[0040] The above-described demolding method for resin-embedded large-arc inverted steel column structure reduces the contact area between the steel column 60 and the large-arc resin product. The elastic deformation of the steel column 60 assists in demolding. Two supporting mechanisms 40 simultaneously expand the steel column 60 during ejection. Specifically, after the product is formed in the mold, the two supporting mechanisms 40 begin to work. At this time, the two supporting mechanisms 40 contact the swing bar 61 and gradually expand the steel column 60 as ejection progresses, ensuring smooth demolding and preventing the steel column 60 from scraping the mold. This solves the problem of large-arc resin products being unable to demold smoothly during the demolding process.

[0041] The ejector device of the injection molding machine drives the power shaft 70 to move upward, which in turn drives the two spreading mechanisms 40 to move the two swing bars 61 outward and upward. In turn, the two swing bars 61 control the steel column bar 60 to spread outward and move upward to demold the resin product with a large curvature.

[0042] In this embodiment, in step 1), the positioning mold base 30 has a hollowed-out mounting groove 31, the bottom of the lower inner mold 20 is inserted into the bottom of the mounting groove 31, the upper inner mold 10 is located in the mounting groove 31, and the inner sidewall of the mounting groove 31 is concave inward to form a wire groove 32, and the upper part of the swing bar 61 abuts against the inner sidewall of the wire groove 32.

[0043] The positioning mold base 30 allows the upper inner mold 10 and the lower inner mold 20 to be positioned and installed for injection molding. The mounting groove 31 can provide a support point for the deformation of the steel column 60 through the wire groove 32.

[0044] In this embodiment, a nozzle 11 is provided on the upper inner mold 10. The bottom of the nozzle 11 extends through the upper inner mold 10 from top to bottom, and the nozzle 11 is connected to the molding cavity 50. In this way, the injection molding machine nozzle can inject the injection molding material from the outside into the molding cavity 50 through the nozzle 11.

[0045] In this embodiment, in step 1), the two swing bars 61 are arranged facing each other and inclined downwards away from the steel column 60. This facilitates the control of the steel column 60 to be ejected and opened simultaneously through the two swing bars 61, improving demolding efficiency and protecting the product.

[0046] In this embodiment, in step 2), the spreading mechanism 40 includes a fixed base 41, a spreading block 42, and a limiting screw 43. A first return spring 44 arranged laterally is connected between the fixed base 41 and the spreading block 42. The limiting screw 43 passes through the fixed base 41 and is connected to the spreading block 42. The lower part of the swing bar 61 is inserted into the spreading block 42.

[0047] The expansion blocks 42 in the two expansion mechanisms 40 abut against the top sides of the power shaft 70 respectively.

[0048] The spreading mechanism 40 is fixed in the lower inner mold 20 by the fixed seat 41, so that the spreading block 42 slides with the fixed seat 41 through the limiting screw 43. The fixed seat 41 and the limiting screw 43 provide directional sliding for the spreading block 42, so that the spreading block 42 can drive the swing bar 61 to spread outward. The first return spring 44 can reset the spreading block 42.

[0049] In this embodiment, one end of the limiting screw 43 extends laterally through one side of the fixing base 41 and passes through the first return spring 44 before being threadedly connected to the spreading block 42. The other end of the limiting screw 43 protrudes from the other side of the fixing base 41. This ensures that the first return spring 44 will not detach or deform arbitrarily during operation.

[0050] In this embodiment, in step 2), one end of the swing bar 61 is connected to the steel column bar 60, and the other end of the swing bar 61 bends downward to form a deflection bar 62. The two deflection bars 62 of the two swing bars 61 are arranged to face each other and downward. In this way, the swing bar 61 can move upward to a certain position with the help of the deflection bar 62. The opening block 42 can continue to drive the deflection bar 62 to open outward, so that the deflection bar 62 can continue to move upward and open outward. This also prevents the deflection bar 62 from scraping the mold.

[0051] The fixed base 41 has an inwardly recessed positioning groove 45, and the offset strip 62 is inserted obliquely into the positioning groove 45; in this way, the offset strip 62 can be better hidden in the positioning groove 45, preventing the offset strip 62 from scratching the mold.

[0052] In this embodiment, in step 1), a plurality of positioning clamping blocks 51 are provided on the bottom of the forming mold cavity 50. The plurality of positioning clamping blocks 51 are arranged sequentially at intervals along the length direction of the steel column 60, and the plurality of positioning clamping blocks 51 are respectively clamped on the steel column 60.

[0053] The molding cavity 50 is clamped onto the steel column 60 by multiple positioning blocks 51, so that it can be stably positioned on the bottom of the molding cavity 50, and the steel column 60 is prevented from being misaligned during product injection molding.

[0054] In this embodiment, in step 4), a positioning lock block 21 is provided in the lower inner mold 20. The positioning lock block 21 has a hollowed-out positioning groove 22, and the upper part of the swing bar 61 is located in the positioning groove 22. In this way, the positioning groove 22 in the positioning lock block 21 can guide the swing bar 61, allowing the steel column bar 60 dragged during the demolding process of the large-arc resin product to have sufficient deformation space to complete the entire process of inverted release from the product.

[0055] This is a 1-outlet 2-cavity mold. The steel column 60 is fixed in the lower inner mold 20 and multiple positioning clamping blocks 51. The swing bar 61 is located in the expansion block 42. The two expansion blocks 42 each expand to the sides with a stroke of 11mm. The power shaft 70 is fixed on the ejection device of the injection molding machine. The power shaft 70 has a stroke of 41mm with the lower inner mold 20.

[0056] The action of this structure is driven by the ejector rod of the injection molding machine, and the lower ejection system ejects upward. During the upward ejection stroke of 40mm, the power shaft 70 also moves upward, and the two linked support blocks 42 move 11mm to the left and right, and the product also detaches from the mold.

[0057] Both the power shaft 70 and the support block 42 are designed with wear-resistant parts to ensure service life, smooth ejection, and precision during sliding; the swing bar 61 is also equipped with a positioning lock block 21 to ensure smooth product ejection and prevent scratching of the mold. The entire mechanism is stable, ejects smoothly, and does not damage the product's glue position.

[0058] In this embodiment, in step 4), the positioning mold base 30 is provided with a movable seat 33 that can move up and down. The power shaft 70 is connected to the movable seat 33. The top of the movable seat 33 is provided with a plurality of second return springs 34. The plurality of second return springs 34 are arranged circumferentially around the top of the movable seat 33 at intervals. The bottom of the second return springs 34 abuts against the top of the movable seat 33, and the top of the second return springs 34 abuts against the inner sidewall of the top of the positioning mold base 30.

[0059] The positioning mold base 30 is provided with a plurality of vertically arranged guide posts 35, which are arranged at intervals around the circumference of the movable base 33 and penetrate the movable base 33.

[0060] While the ejector device of the injection molding machine drives the movable seat 33, the movable seat 33 can drive multiple power shafts 70 to move upward, thereby realizing the control of the opening mechanism 40 by the power shafts 70. Multiple second return springs 34 can ensure the reset function of the movable seat 33. Multiple guide columns 35 can guide the movement direction of the movable seat 33 and also prevent the second return springs 34 from deviating from their movement.

[0061] In this embodiment, inclined top surfaces 71 are formed on both sides of the top of the power shaft 70. The two inclined top surfaces 71 are arranged opposite each other and one end of the two inclined top surfaces 71 is connected to each other. The support block 42 has an facing end surface 46 facing the power shaft 70. The facing end surface 46 is arranged in an inclined manner and is in movable contact with the inclined top surface 71.

[0062] The power shaft 70 abuts against the facing end faces 46 of the two supporting blocks 42 via two inclined top surfaces 71, so that as the power shaft 70 moves upward, the two inclined top surfaces 71 can push the supporting blocks 42 away from the power shaft 70, thereby realizing the supporting blocks 42 to support the swing bar 61.

[0063] In this embodiment, a toggle block 23 is provided in the lower inner mold 20. The toggle block 23 and the expansion block 42 are arranged vertically opposite each other. The toggle block 23 extends along the direction of the swing bar 61. The toggle block 23 is recessed inward to form a guide groove 24. The guide groove 24 passes through the toggle block 23 from top to bottom. The middle part of the swing bar 61 is located in the guide groove 24. Multiple hemispheres 25 with extrusion deformation are protruded on the inner sidewalls of both sides of the guide groove 24. The multiple hemispheres 25 are arranged side by side at intervals along the length direction of the guide groove 24. The swing bar 61 is located between adjacent hemispheres 25.

[0064] As the swing bar 61 expands and rises outward, it will generate friction, compression, and vibration with the hemisphere 25. The swing bar 61 will transmit the vibration to the steel column bar 60, thereby accelerating the demolding efficiency of the steel column bar 60 for resin products with large curvature, and also protecting the resin products with large curvature during demolding.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A demolding method for resin-embedded large-arc inverted steel column structures, characterized in that, Includes the following steps: 1) Press the upper inner mold, the lower inner mold, and the positioning mold base together. The upper inner mold and the lower inner mold form a molding cavity for injection molding of raw materials. A steel column with a large arc and elastic deformation is embedded in the bottom of the molding cavity. The two ends of the steel column extend outward from the molding cavity and bend to form swing strips. 2) Two side-by-side, relatively spaced-apart support mechanisms are installed in the lower inner mold, and the two swing bars are respectively inserted into the two support mechanisms; resin raw material is injected into the molding cavity; 3) After the large-arc resin product in the molding cavity is formed, separate the upper inner mold and the lower inner mold, and move the upper inner mold upward to the set position; 4) The positioning mold base is provided with a power shaft. The bottom of the power shaft is exposed outside the bottom of the positioning mold base. The top of the power shaft is inserted into the lower inner mold. The top two sides of the power shaft abut against two opening mechanisms respectively. The power shaft is driven to move upward by the ejection device of the injection molding machine. This allows the two opening mechanisms to drive the two swing bars to open to both sides, thereby allowing the steel column to carry the large-arc resin product to complete the entire process of inverted release from the product.

2. The demolding method for resin-embedded large-arc inverted steel column structure as described in claim 1, characterized in that, In step 1), the positioning mold base has a hollowed-out mounting groove, the bottom of the lower inner mold is inserted into the bottom of the mounting groove, the upper inner mold is located in the mounting groove, the inner sidewall of the mounting groove is concave to form a wire groove, and the upper part of the swing bar abuts against the inner sidewall of the wire groove.

3. The demolding method for resin-embedded large-arc inverted steel column structure as described in claim 1, characterized in that, The upper inner mold is provided with a nozzle, the bottom of which extends through the upper inner mold from top to bottom, and the nozzle is connected to the molding cavity.

4. The demolding method for resin-embedded large-arc inverted steel column structure as described in claim 1, characterized in that, In step 1), the two swing bars are arranged facing each other and inclined downwards away from the steel column bars.

5. The demolding method for a resin-embedded large-arc inverted steel column structure as described in any one of claims 1 to 4, characterized in that, In step 2), the spreading mechanism includes a fixed base, a spreading block, and a limiting screw. A first return spring arranged laterally is connected between the fixed base and the spreading block. The limiting screw passes through the fixed base and is connected to the spreading block. The lower part of the swing bar is inserted into the spreading block. The two spreading blocks in the spreading mechanism respectively abut against the top two sides of the power shaft.

6. The demolding method for resin-embedded large-arc inverted steel column structure as described in claim 5, characterized in that, One end of the limiting screw passes laterally through one side of the fixed base and through the first reset spring, and is threadedly connected to the expansion block. The other end of the limiting screw is exposed on the other side of the fixed base.

7. The demolding method for resin-embedded large-arc inverted steel column structure as described in claim 5, characterized in that, In step 2), one end of the swing bar is connected to the steel column bar, and the other end of the swing bar bends downward to form a deflection bar. The two deflection bars of the two swing bars are arranged in a downward inclined manner. The fixed base has an inwardly recessed positioning groove, and the offset strip is inserted obliquely into the positioning groove.

8. The demolding method for a resin-embedded large-arc inverted steel column structure as described in any one of claims 1 to 4, characterized in that, In step 1), a plurality of positioning clamping blocks are provided on the bottom of the forming mold cavity. The plurality of positioning clamping blocks are arranged sequentially at intervals along the length of the steel column, and the plurality of positioning clamping blocks are respectively clamped on the steel column.

9. The demolding method for a resin-embedded large-arc inverted steel column structure as described in any one of claims 1 to 4, characterized in that, In step 4), a positioning lock block is provided in the lower inner mold, and the positioning lock block has a positioning groove with a hollow arrangement. The upper part of the swing bar is located in the positioning groove.

10. The demolding method for a resin-embedded large-arc inverted steel column structure as described in any one of claims 1 to 4, characterized in that, In step 4), the positioning mold base is provided with a movable seat that moves up and down. The power shaft is connected to the movable seat. The top of the movable seat is provided with a plurality of second return springs. The plurality of second return springs are arranged circumferentially around the top of the movable seat at intervals. The bottom of the second return spring abuts against the top of the movable seat, and the top of the second return spring abuts against the inner sidewall of the top of the positioning mold base. The positioning mold base is provided with a plurality of vertically arranged guide columns, which are arranged at intervals around the circumference of the movable base and penetrate the movable base.

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