Demoulding method for resin embedded large-radian inverted steel column structure

Abstract

The invention relates to the technical field of molds, and discloses a demolding method for embedding resin into a large-radian inverted steel column structure, which comprises the following steps of: 1) tightly pressing an upper inner mold, a lower inner mold and a positioning mold base together; (2) resin raw materials are injected into the forming die cavity; (3) after the large-radian resin product in the forming die cavity is formed, the upper inner die and the lower inner die are separated, and the upper inner die is moved upwards to a set position; (4) driving the power shaft to move upwards through an ejection device of the injection molding machine, so that the two opening mechanisms respectively drive the steel column strip to drive the large-radian resin product to complete the whole process that the inverted buckle is separated from the product; the contact area with a large-radian resin product can be reduced through the steel column strip, after the product is formed in a mold, the two opening mechanisms start to work, at the moment, the two opening mechanisms can make contact with the swing strip, the steel column strip is gradually opened along with ejection, it is guaranteed that the product is smoothly demolded, and the steel column strip is prevented from scraping the mold.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, and in particular to a demoulding method for a resin-embedded large-radian undercut steel column structure. Background Art

[0002] The injection molding of resin products requires mold making before injection molding; when the structural curvature of the resin product is large, 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 four sides of the resin product to demold outward, and at the same time, the middle push rod pushes the inside of the resin product to force the undercut to demold outward; and because the structural curvature of the resin product is large, the internal undercut needs to have the ability to deform before it can be ejected. If the internal undercut does not deform and is forced to be demolded outward, the internal undercut will be broken, which will not only affect the quality of the product, but also cause the product to be scrapped and affect the next pouring. Summary of the invention

[0003] The purpose of the present invention is to provide a demoulding method for a resin-embedded large-curvature undercut steel column structure, aiming to solve the problem in the prior art that large-curvature resin products cannot be demoulded smoothly during the demoulding process.

[0004] The present invention is achieved by a method for demoulding a resin-embedded large-radian undercut steel column structure, comprising the following steps:

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

[0006] 2) Two opening mechanisms are installed in the lower inner mold and are arranged side by side and at intervals, and the two swing bars are respectively inserted in the two opening mechanisms; and resin raw materials are injected into the molding cavity;

[0007] 3) After the large-arc resin product in the molding cavity is molded, the upper inner mold is separated from the lower inner mold, and the upper inner mold is moved upward to a set position;

[0008] 4) A power shaft is arranged in the positioning mold base, the bottom of the power shaft is exposed outside the bottom of the positioning mold base, the top of the power shaft is inserted in the lower inner mold, the two sides of the top of the power shaft are respectively abutted on two support mechanisms, and the power shaft is driven to move upward by the ejection device of the injection molding machine;

[0009] The two opening mechanisms respectively drive the two swing bars to open toward both sides, and then the steel column bar drives the large-arc resin product to complete the entire process of inverted separation from the product.

[0010] Furthermore, in the step 1), a hollow mounting groove is provided in the positioning mold base, 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, and a wire groove is formed on the inner side wall of the mounting groove inwardly concave, and the upper part of the swing bar abuts against the inner side wall of the wire groove.

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

[0012] Furthermore, in the step 1), the two swing bars are arranged to face each other and deviate from the steel column bar and tilt downward.

[0013] Furthermore, in step 2), the expansion mechanism includes a fixed seat, an expansion block and a limit screw, a first return spring arranged laterally is connected between the fixed seat and the expansion block, the limit screw passes through the fixed seat and is connected to the expansion block, and the lower part of the swing bar is inserted in the expansion block;

[0014] The spreading blocks in the two spreading mechanisms are respectively abutted on both sides of the top of the power shaft.

[0015] Furthermore, one end of the limit screw transversely penetrates one side of the fixing seat and passes through the first return spring, and is threadedly connected to the expansion block, and the other end of the limit screw is exposed outside the other side of the fixing seat.

[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 is bent downward to form a deviation bar, and the two deviation bars of the two swing bars are arranged to be inclined downward toward each other;

[0017] The fixing seat is inwardly recessed to form an inclined positioning groove, and the deviation strip is obliquely inserted into the positioning groove.

[0018] Furthermore, in the step 1), a plurality of positioning clamps are convexly provided on the bottom of the molding cavity, and the plurality of positioning clamps are sequentially spaced apart along the length direction of the steel column bar, and the plurality of positioning clamps are respectively clamped on the steel column bar.

[0019] Furthermore, in the step 4), a positioning locking block is provided in the lower inner mold, and a hollow positioning sliding groove is provided on the positioning locking block, and the upper part of the swing bar is located in the positioning sliding groove.

[0020] Further, in the step 4), a movable seat that moves up and down is provided in the positioning mold base, the power shaft is connected to the movable seat, a plurality of second return springs are provided on the top of the movable seat, and the plurality of second return springs are arranged around and spaced along the top of the movable seat, the bottom of the second return spring abuts on the top of the movable seat, and the top of the second return spring abuts on the inner side wall of the top of the positioning mold base;

[0021] A plurality of vertically arranged guide columns are provided in the positioning mold base. The plurality of guide columns are arranged at intervals along the circumference of the moving base, and the guide columns penetrate the moving base.

[0022] Compared with the prior art, the demoulding method of a resin-embedded large-curvature inverted steel column structure provided by the present invention can reduce the contact area with the large-curvature resin product through the steel column bar, and utilize the elastic deformation function of the steel column bar to assist the product demoulding, and utilize two spreading mechanisms to spread the steel column bar while ejecting during the ejection process. Specifically, after the product is formed in the mold, the two spreading mechanisms start to work. At this time, the two spreading mechanisms will contact the swing bar and gradually spread the steel column bar as the ejection proceeds, ensuring smooth demoulding of the product and preventing the steel column bar from scraping the mold, thereby solving the problem that large-curvature resin products cannot be smoothly demoulded during the demoulding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of a demoulding method of a resin-embedded large-curved undercut steel column structure provided by the present invention;

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

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

[0026] Figure 4 It is a schematic diagram of the front view cross-section structure of the lower inner mold and the positioning mold base provided by the present invention;

[0027] Figure 5 It is a three-dimensional exploded schematic diagram of the expansion mechanism provided by the present invention;

[0028] Figure 6 It is a schematic diagram of the top structure 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, expansion mechanism 40, forming mold cavity 50, steel column bar 60, power shaft 70, nozzle piece 11, positioning lock block 21, positioning slide groove 22, toggle block 23, guide groove 24, semicircular ball 25, installation groove 31, wire groove 32, movable seat 33, second return spring 34, guide column 35, fixed seat 41, expansion 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 DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0032] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

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

[0034] The demoulding method of a resin-embedded large-radius undercut steel column structure comprises the following steps:

[0035] 1) Press the upper inner mold 10, the lower inner mold 20 and the positioning mold base 30 together, and the upper inner mold 10 and the lower inner mold 20 enclose a molding cavity 50 for molding the injection molding raw material. A steel column bar 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 bar 60 extend outward away from the molding cavity 50 and bend to form a swing bar 61;

[0036] 2) Two spaced-apart opening mechanisms 40 are installed in the lower inner mold 20, and two swing bars 61 are respectively inserted in the two opening mechanisms 40; resin raw materials are injected into the molding cavity 50;

[0037] 3) After the large-curvature resin product in the molding cavity 50 is molded, the upper inner mold 10 is separated from the lower inner mold 20, and the upper inner mold 10 is moved upward to a 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 two sides of the top of the power shaft 70 are respectively abutted on the two opening mechanisms 40, and the power shaft 70 is driven to move upward by the ejection device of the injection molding machine;

[0039] The two opening mechanisms 40 respectively drive the two swing bars 61 to open toward both sides, and then the steel column bar 60 drives the large-arc resin product to complete the entire process of inverted separation from the product.

[0040] The demolding method of the resin-embedded large-curvature inverted steel column structure provided above can reduce the contact area with the large-curvature resin product through the steel column bar 60, and utilize the elastic deformation function of the steel column bar 60 to assist the product demolding, and utilize the two expansion mechanisms 40 to expand the steel column bar 60 while ejecting during the ejection process. Specifically, after the product is formed in the mold, the two expansion mechanisms 40 start to work. At this time, the two expansion mechanisms 40 will contact the swing bar 61 and gradually expand the steel column bar 60 as the ejection proceeds, ensuring smooth demolding of the product and preventing the steel column bar 60 from scraping the mold, thereby solving the problem that large-curvature resin products cannot be smoothly demolded during the demolding process.

[0041] The ejection device of the injection molding machine drives the power shaft 70 to move upward, so that the power shaft 70 drives the two expansion mechanisms 40 to drive the two swing bars 61 to expand outward and move upward, and then the two swing bars 61 control the steel column bar 60 to expand outward and move upward to demold the resin product with a large arc.

[0042] In this embodiment, in step 1), a hollow mounting groove 31 is opened in the positioning mold base 30, 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 a wire groove 32 is formed on the inner side wall of the mounting groove 31 inwardly concavely, and the upper part of the swing bar 61 abuts against the inner side wall of the wire groove 32.

[0043] The positioning mold base 30 can be used for positioning, installing and injection molding of the upper inner mold 10 and the lower inner mold 20 , and the installation groove 31 can provide a fulcrum for deformation of the steel column bar 60 through the wire groove 32 .

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

[0045] In this embodiment, in step 1), the two swing bars 61 are arranged to face each other and deviate from the steel column bar 60 and tilt downward. In this way, it is convenient to control the steel column bar 60 to push out and open by the two swing bars 61, thereby improving the demoulding efficiency and protecting the product.

[0046] In this embodiment, in step 2), the expansion mechanism 40 includes a fixed seat 41, an expansion block 42 and a limit screw 43, a first return spring 44 arranged laterally is connected between the fixed seat 41 and the expansion block 42, the limit screw 43 passes through the fixed seat 41 and is connected to the expansion block 42, and the lower part of the swing bar 61 is inserted into the expansion block 42;

[0047] The spreading blocks 42 in the two spreading mechanisms 40 are respectively in contact with both sides of the top of the power shaft 70 .

[0048] The expansion mechanism 40 is fixed in the lower inner mold 20 by means of a fixing seat 41, so that the expansion block 42 is slidably matched with the fixing seat 41 through a limit screw 43, and the fixing seat 41 and the limit screw 43 are used to provide directional sliding for the expansion block 42, so that the expansion block 42 can directionally drive the swing bar 61 to expand outward, and the expansion block 42 can be reset by means of a first reset spring 44.

[0049] In this embodiment, one end of the limit screw 43 passes through one side of the fixing seat 41 and the first return spring 44, and is threadedly connected to the expansion block 42, and the other end of the limit screw 43 is exposed outside the other side of the fixing seat 41. In this way, the first return spring 44 will not be separated and will not be deformed randomly 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 is bent downward to form a deviation bar 62, and the two deviation bars 62 of the two swing bars 61 are arranged to be inclined downward toward each other; in this way, the swing bar 61 can be arranged with the help of the structural arrangement of the deviation bars 62, so that when the swing bar 61 moves upward to a certain position, the expansion block 42 can continue to expand outward by driving the deviation bars 62, so that the deviation bars 62 continue to move upward and expand outward, and the deviation bars 62 can also be prevented from scraping the mold;

[0051] The fixing seat 41 is recessed inward to form an inclined positioning groove 45, and the deviation strip 62 is inserted obliquely into the positioning groove 45; in this way, the deviation strip 62 can be better hidden in the positioning groove 45 to prevent the deviation strip 62 from scraping the mold.

[0052] In this embodiment, in step 1), a plurality of positioning clamps 51 are convexly provided on the bottom of the molding cavity 50, and the plurality of positioning clamps 51 are arranged in sequence and spaced apart along the length direction of the steel column bar 60, and the plurality of positioning clamps 51 are clamped on the steel column bar 60 respectively.

[0053] The molding cavity 50 is clamped on the steel column 60 by a plurality of positioning clamps 51, so that the steel column 60 can be firmly positioned on the bottom of the molding cavity 50, thereby preventing the steel column 60 from being offset during the product injection molding process.

[0054] In this embodiment, in step 4), a positioning lock block 21 is provided in the lower inner mold 20, and a hollow positioning slot 22 is provided on the positioning lock block 21, and the upper part of the swing bar 61 is located in the positioning slot 22. In this way, the positioning slot 22 in the positioning lock block 21 can guide the swing bar 61, so that the steel column bar 60 dragged during the demoulding process of the resin product with a large arc has enough deformation space to complete the entire process of undercutting and removing the product.

[0055] This is a 1-out 2-cavity mold. The steel column bar 60 is fixed in the lower inner mold 20 and multiple positioning clamps 51. The swing bar 61 is located in the expansion block 42. The two expansion blocks 42 are expanded to both sides with a stroke of 11mm. The power shaft 70 is fixed on the ejector device of the injection molding machine. The power shaft 70 and the lower inner mold 20 have a stroke of 41mm.

[0056] The structural action is that the ejector rod of the injection molding machine pushes the lower ejector system upwards. During the 40mm upward ejection stroke, the power shaft 70 also moves upwards, and the two linked expansion blocks 42 move 11mm to the left and right, and the product also leaves the mold.

[0057] 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; a positioning lock block 21 is also installed upward on the swing bar 61 to ensure smooth ejection of the product and prevent scratches on the mold. The entire mechanism has a stable structure, smooth ejection, and does not damage the glue position of the product.

[0058] In this embodiment, in step 4), a movable seat 33 that moves up and down is provided in the positioning mold base 30, the power shaft 70 is connected to the movable seat 33, and a plurality of second return springs 34 are provided on the top of the movable seat 33. The plurality of second return springs 34 are arranged around and spaced along the top of the movable seat 33, the bottom of the second return spring 34 abuts on the top of the movable seat 33, and the top of the second return spring 34 abuts on the inner side wall of the top of the positioning mold base 30;

[0059] A plurality of vertically arranged guide posts 35 are provided in the positioning mold base 30 . The plurality of guide posts 35 are arranged at intervals around the circumference of the moving base 33 , and the guide posts 35 penetrate the moving base 33 .

[0060] The ejection device of the injection molding machine drives the moving seat 33 while the moving seat 33 can drive the multiple power shafts 70 to move upward, thereby realizing the control of the power shafts 70 over the expansion mechanism 40. The multiple second return springs 34 can ensure the return function of the moving seat 33. The moving direction of the moving seat 33 can be directed by the multiple guide columns 35, and the deviation effect of the second return springs 34 can also be avoided.

[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 back-to-back and opposite to each other, and one ends of the two inclined top surfaces 71 are butted against each other. The support block 42 has an end surface 46 facing the power shaft 70, and the end surface 46 is arranged in an inclined shape, and the end surface 46 is movably abutted against the inclined top surface 71.

[0062] The power shaft 70 is respectively in contact with the facing end surfaces 46 of the two expansion blocks 42 through two inclined top surfaces 71, so that when the power shaft 70 moves upward, the two inclined top surfaces 71 can push the expansion blocks 42 to move away from the power shaft 70, thereby realizing the expansion movement of the expansion blocks 42 on the swing bar 61.

[0063] In this embodiment, a toggle block 23 is provided in the lower inner mold 20, and the toggle block 23 and the opening block 42 are arranged opposite to each other in the upper and lower directions. The toggle block 23 is extended and arranged along the direction in which the swing bar 61 is opened. The toggle block 23 is recessed inward to form a guide groove 24, and the guide groove 24 penetrates the toggle block 23 from top to bottom. The middle part of the swing bar 61 is located in the guide groove 24, and a plurality of semicircular balls 25 with extrusion deformation are respectively convexly provided on the inner side walls on both sides of the guide groove 24. The plurality of semicircular balls 25 are arranged side by side and spaced apart along the length direction of the guide groove 24, and the swing bar 61 is located between adjacent semicircular balls 25;

[0064] When the swing bar 61 is stretched outward and rises, friction and extrusion vibration will be generated between the swing bar 61 and the semi-circular sphere 25. The swing bar 61 will transmit the generated vibration to the steel column bar 60, thereby accelerating the demoulding efficiency of the steel column bar 60 for large-arc resin products, and also playing a protective role in the demoulding of large-arc resin products.

[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 in the protection scope of the present invention.

Claims

1. A demoulding method for a resin-embedded large-radian undercut steel column structure, characterized in that: The following steps are involved: 1) Press the upper inner mold, the lower inner mold and the positioning mold base together, and the upper inner mold and the lower inner mold enclose a molding cavity for molding the injection molding raw material. A steel column bar with a large arc undercut and elastic deformation is embedded in the bottom of the molding cavity. The two ends of the steel column bar extend outward away from the molding cavity and bend to form a swing bar; 2) Two opening mechanisms are installed in the lower inner mold and are arranged side by side and at intervals, and the two swing bars are respectively inserted in the two opening mechanisms; and resin raw materials are injected into the molding cavity; 3) After the large-arc resin product in the molding cavity is molded, the upper inner mold is separated from the lower inner mold, and the upper inner mold is moved upward to a set position; 4) A power shaft is arranged in the positioning mold base, the bottom of the power shaft is exposed outside the bottom of the positioning mold base, the top of the power shaft is inserted in the lower inner mold, the two sides of the top of the power shaft are respectively abutted on two support mechanisms, and the power shaft is driven to move upward by the ejection device of the injection molding machine; The two opening mechanisms respectively drive the two swing bars to open toward both sides, and then the steel column bar drives the large-arc resin product to complete the entire process of inverted separation from the product.

2. The demoulding method of the resin-embedded large-radian undercut steel column structure according to claim 1, characterized in that: In the step 1), a hollow mounting groove is provided in the positioning mold base, 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, and a wire groove is formed on the inner side wall of the mounting groove inwardly concave, and the upper part of the swing bar abuts against the inner side wall of the wire groove.

3. The demoulding method of the resin-embedded large-radian undercut steel column structure according to claim 1, characterized in that: The upper inner mold is provided with a nozzle piece, the bottom of which penetrates the upper inner mold from top to bottom, and the nozzle piece is communicated with the molding cavity.

4. The demoulding method of the resin-embedded large-radian undercut steel column structure according to claim 1, characterized in that: In the step 1), the two swing bars are arranged to face each other and deviate from the steel column bar and tilt downward.

5. The demoulding method of the resin-embedded large-radian undercut steel column structure according to any one of claims 1 to 4, characterized in that: In the step 2), the expansion mechanism includes a fixed seat, an expansion block and a limit screw, a first return spring arranged laterally is connected between the fixed seat and the expansion block, the limit screw passes through the fixed seat and is connected to the expansion block, and the lower part of the swing bar is inserted into the expansion block; The spreading blocks in the two spreading mechanisms are respectively abutted on both sides of the top of the power shaft.

6. The demoulding method of the resin-embedded large-radian undercut steel column structure according to claim 5, characterized in that: One end of the limit screw transversely penetrates one side of the fixing seat and passes through the first return spring, and is threadedly connected with the expansion block, and the other end of the limit screw is exposed outside the other side of the fixing seat.

7. The demoulding method of the resin-embedded large-radian undercut steel column structure according to claim 5, characterized in that: In the step 2), one end of the swing bar is connected to the steel column bar, and the other end of the swing bar is bent and extended downward to form a deviation bar, and the two deviation bars of the two swing bars are arranged to be inclined downward toward each other; The fixing seat is inwardly recessed to form an inclined positioning groove, and the deviation strip is obliquely inserted into the positioning groove.

8. The demoulding method of the resin-embedded large-radian undercut steel column structure according to any one of claims 1 to 4, characterized in that: In the step 1), a plurality of positioning clamps are convexly provided on the bottom of the molding cavity, and the plurality of positioning clamps are sequentially spaced along the length direction of the steel column bar, and the plurality of positioning clamps are respectively clamped on the steel column bar.

9. The demoulding method of the resin-embedded large-radian undercut steel column structure according to any one of claims 1 to 4, characterized in that: In the step 4), a positioning locking block is provided in the lower inner mold, and a positioning sliding groove with a hollow arrangement is provided on the positioning locking block, and the upper part of the swing bar is located in the positioning sliding groove.

10. The demoulding method of the resin-embedded large-radian undercut steel column structure according to any one of claims 1 to 4, characterized in that: In the step 4), a movable seat that moves up and down is provided in the positioning mold base, the power shaft is connected to the movable seat, a plurality of second return springs are provided on the top of the movable seat, and the plurality of second return springs are arranged around and spaced along the top of the movable seat, 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 side wall of the top of the positioning mold base; A plurality of vertically arranged guide columns are provided in the positioning mold base. The plurality of guide columns are arranged at intervals along the circumference of the moving base, and the guide columns penetrate the moving base.

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