Injection mold for a thin-walled cylindrical part of an automobile

Abstract

This invention discloses an injection mold for thin-walled cylindrical automotive parts, relating to the field of injection mold equipment technology. The invention includes a mounting block, with a fixed mold fixedly mounted on the top of the mounting block. A guide post is movably sleeved inside the fixed mold, and a moving mold is fixed to the upper end of the guide post. An injection cavity is formed inside the moving mold. The fixed mold and the moving mold fit together to form an inner cavity and a guide cavity. A lower mold module is fixed annularly at equal intervals inside the fixed mold, and an upper mold module is fixed annularly at equal intervals inside the moving mold, corresponding to the lower mold module. The invention uses an electric telescopic rod to drive a moving disc, which in turn moves a closing block upwards to close the guide cavity and the upper feed port. This prevents the molten injection inside the upper and lower mold modules from connecting with the residual molten injection inside the injection cavity. When the moving disc moves downwards, it compresses the air inside the cylinder and ejects it through the side cavity block guide air pipe, uniformly ejecting the thin-walled cylindrical automotive part.

Description

Technical Field

[0001] This invention relates to the field of injection mold equipment technology, and specifically to an injection mold for thin-walled cylindrical automotive parts. Background Technology

[0002] Injection molds are specialized tools used in the injection molding process. They are used to inject heated and molten plastic into the mold cavity, and after cooling and solidification, the finished product is obtained. Injection molds are widely used to produce plastic parts and products, and are particularly suitable for mass production of products with complex geometries and high precision requirements, such as automotive parts, electronic casings, home appliances, and toys.

[0003] Chinese patent (application number: CN202111304570.6) discloses an injection mold and ejection method for a thin-walled cylindrical part for automobiles. The injection mold includes: a sprue plate, a front mold plate, a rear mold plate, a slider, and a rear ejector plate arranged sequentially; a core-pulling rod is provided on the sprue plate for forming the inner wall of the thin-walled cylindrical part for automobiles; an ejector rod is provided on the rear ejector plate; and a stroke control device is provided between the front mold plate and the rear mold plate. The injection mold for the thin-walled cylindrical part for automobiles of the present invention, by setting the core-pulling rod on the sprue plate and using the stroke control device to keep the front mold plate and the rear mold plate closed initially, and then, after the core-pulling rod is completely pulled out of the thin-walled cylindrical part for automobiles, the sliders on both sides of the molding cavity move away, and finally the part is ejected by the ejector rod, gradually weakens the covering force of the thin-walled cylindrical part for automobiles on the injection mold, and avoids deformation and breakage of the thin-walled cylindrical part for automobiles during demolding.

[0004] The patent and existing technologies have the following technical problems in practical use:

[0005] 1. After the injection molten metal is delivered into the cavity through the injection cavity of the injection mold, the residual portion of the injection molten metal inside the injection cavity will connect with the molten metal inside the cavity. This causes the molten metal inside the injection cavity to form excess columnar protrusions on the surface of the thin-walled columnar parts of the automobile after cooling and solidification. This requires personnel to remove the columnar protrusions formed on the surface of the thin-walled columnar parts of the automobile, which increases the consumption of manpower and time. Therefore, it needs to be improved.

[0006] 2. Because the automotive thin-walled cylindrical parts are extremely thin, and the push rod can only extrude a portion of the part, the uneven stress on the parts may cause deformation or even breakage. Therefore, improvements are needed. Summary of the Invention

[0007] The purpose of this invention is to provide an injection mold for thin-walled cylindrical parts for automobiles in order to solve the above problems.

[0008] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0009] An injection mold for a thin-walled cylindrical part for automobiles includes a mounting block. A fixed mold is fixedly mounted on the top of the mounting block. A guide post is movably sleeved inside the fixed mold. A movable mold is fixed at the upper end of the guide post. An injection cavity is opened inside the movable mold. The fixed mold and the movable mold fit together to form an inner cavity and a guide cavity. A lower mold module is fixedly fixed annularly at equal intervals inside the fixed mold. An upper mold module is fixed annularly at equal intervals inside the movable mold. The upper mold module and the lower mold module correspond to each other. A bottom block is mounted on the bottom of the lower mold module. A core rod located inside the upper mold module and the lower mold module is provided on the bottom block. A closing block extending into the lower mold module and the bottom block is movably sleeved inside the fixed mold.

[0010] The lower mold module includes a lower mold body and a lower feed port. The lower mold body is fixedly sleeved with the inner wall of the fixed mold, and the lower feed port is opened inside the lower mold body and is movably sleeved with the closing block.

[0011] The upper mold module includes an upper mold body and an upper feed port. The upper mold body is fixedly sleeved with the inner wall of the moving mold. The upper feed port is opened in the upper mold body and communicates with the guide cavity. The upper feed port corresponds to the lower feed port.

[0012] Furthermore, the fixed mold has a bottom opening inside, and an electric telescopic rod is fixed inside the bottom opening. The output end of the electric telescopic rod is connected to a connecting rod, and a movable disk is fixedly connected to the upper end of the connecting rod. The top of the movable disk is fixedly connected to the bottom of the closing block.

[0013] Furthermore, the core rod includes a fixed rod and a connecting block and a fixed block. The fixed block is fixedly connected to the inner wall of the fixed mold. The top of the fixed block is fixedly connected to the bottom of the connecting block. The upper end of the connecting block passes through the bottom block and is fixedly connected to the fixed rod. The fixed rod is located inside the upper mold module and the lower mold module.

[0014] Furthermore, a convex groove is provided inside the bottom block, a convex block is movably fitted inside the convex groove, an insert block is fixedly connected to the bottom of the convex block, a slot is provided inside the fixed mold, and one end of the insert block extends into the slot and is movably fitted with the inner wall of the slot.

[0015] Furthermore, one end of the insert block is hinged to a first hinge block, and the other end of the first hinge block is hinged to a closing block.

[0016] Furthermore, a second hinge block is hinged to the first hinge block, and a moving rod is hinged to the other end of the second hinge block. The upper end of the moving rod passes through the fixed mold and extends into the interior of the cavity.

[0017] Furthermore, a cylinder is movably sleeved on the outer surface of the connecting rod, and a side cavity block is fixedly connected to the lower end of the cylinder at equal intervals in an annular shape. The side of the side cavity block is fixedly connected to the side of the bottom opening.

[0018] Furthermore, an air duct is fixedly connected to the upper end of the side cavity block, and the other end of the air duct contacts the side of the bottom block.

[0019] Furthermore, there are four sets of air ducts, with each set located at both ends of the base block.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. In this invention, when the injection molten material flows into the upper and lower mold modules through the injection cavity, inner cavity, and guide cavity, the electric telescopic rod drives the moving disk to move the sealing block upward. This causes the sealing block to move upward and close the guide cavity and upper feed port, preventing the injection molten material inside the upper and lower mold modules from connecting with the residual injection molten material inside the injection cavity. Consequently, after the thin-walled columnar part of the automobile cools, no extra columnar protrusions will form on the surface. Therefore, it is not necessary to remove the columnar protrusions formed on the surface of the thin-walled columnar part of the automobile; only simple grinding of the thin-walled columnar part of the automobile is required, reducing labor consumption.

[0022] 2. When the cooled and formed thin-walled cylindrical part of an automobile needs to be ejected, the present invention drives the moving disc to move into the interior of the cylinder through an electric telescopic rod. This causes the closing block to pull the first hinge block downward, which in turn causes the first hinge block to pull the bottom block downward along the outer surface of the connecting block through the insert block, the convex block and the convex groove. This causes the bottom block to gradually open a closed cavity at the bottom of the thin-walled cylindrical part of the automobile. At the same time, the moving disc compresses the air inside the cylinder and ejects it through the air guide pipe of the side cavity block. This allows the gas ejected from the air guide pipe to be introduced into the closed cavity to push the thin-walled cylindrical part of the automobile. This allows the gas inside the closed cavity to uniformly compress the thin-walled cylindrical part of the automobile, thereby achieving the purpose of uniformly ejecting the thin-walled cylindrical part of the automobile and reducing the possibility of deformation or even breakage of the thin-walled cylindrical part of the automobile due to uneven force.

[0023] 3. This invention activates an electric telescopic rod, causing the connecting rod to move the sealing block upward via a moving disc. This causes the sealing block to close the guide cavity, and the sealing block pushes the insert block into the slot via the first hinge block. During the process of the first hinge block pushing the insert block, the first hinge block pulls the moving rod downward along the inner wall of the cavity via the second hinge block, thereby increasing the internal cavity area. This allows the sealing block to squeeze the injection melt inside the guide cavity into the inner cavity, preventing the injection melt from flowing back from the injection chamber and causing waste. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the present invention;

[0025] Figure 2 This is a front cross-sectional view of the present invention;

[0026] Figure 3 This is a front sectional view of the mold of the present invention;

[0027] Figure 4 This is a schematic diagram of the upper and lower modules of the present invention;

[0028] Figure 5 This is a schematic diagram of the base block after it has been moved according to the present invention;

[0029] Figure 6 This is the present invention. Figure 2 Enlarged view of a portion of point A in the middle;

[0030] Figure 7 This is the present invention. Figure 3 Enlarged view of a portion of point B in the middle;

[0031] Figure 8 This is the present invention. Figure 5 A magnified view of a portion of point C in the middle.

[0032] Reference numerals: 1. Mounting block; 2. Fixed mold; 3. Moving mold; 4. Guide pillar; 5. Injection cavity; 6. Upper mold module; 601. Upper mold body; 602. Upper feed port; 7. Lower mold module; 701. Lower mold body; 702. Lower feed port; 8. Inner cavity; 9. Guide cavity; 10. Core rod; 101. Fixing rod; 102. Connecting block; 103. Fixing block; 11. Closing block; 12. Bottom block; 13. Moving rod; 14. Bottom opening; 15. Convex groove; 16. Convex block; 17. Insert block; 18. Slot; 19. First hinge block; 20. Second hinge block; 21. Moving disk; 22. Cylinder; 23. Side cavity block; 24. Connecting rod; 25. Electric telescopic rod; 26. Air guide pipe. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0034] Example 1, as Figures 1-8 As shown, an injection mold for a thin-walled cylindrical part of an automobile includes a mounting block 1. A fixed mold 2 is fixedly mounted on the top of the mounting block 1. A guide post 4 is movably sleeved inside the fixed mold 2. A movable mold 3 is fixed at the upper end of the guide post 4. An injection cavity 5 is opened inside the movable mold 3. The fixed mold 2 and the movable mold 3 are fitted together to form an inner cavity 8 and a guide cavity 9. A lower mold module 7 is fixedly fixed in an annular shape at equal intervals inside the fixed mold 2. An upper mold module 6 is fixedly fixed in an annular shape at equal intervals inside the movable mold 3. The upper mold module 6 and the lower mold module 7 correspond to each other. A bottom block 12 is installed at the bottom of the lower mold module 7. A core rod 10 located inside the upper mold module 6 and the lower mold module 7 is provided on the bottom block 12. A closing block 11 extending into the lower mold module 7 and the bottom block 12 is movably sleeved inside the fixed mold 2.

[0035] The lower mold module 7 includes a lower mold body 701 and a lower feed port 702. The lower mold body 701 is fixedly sleeved with the inner wall of the fixed mold 2. The lower feed port 702 is opened inside the lower mold body 701 and is movably sleeved with the closing block 11.

[0036] The upper mold module 6 includes an upper mold body 601 and an upper feed port 602. The upper mold body 601 is fixedly sleeved with the inner wall of the moving mold 3. The upper feed port 602 is opened in the upper mold body 601 and communicates with the guide cavity 9. The upper feed port 602 corresponds to the lower feed port 702.

[0037] The driving mechanism on the injection molding machine moves the moving mold 3 closer to the fixed mold 2 until the moving mold 3 and the fixed mold 2 are tightly closed, forming a closed inner cavity 8 and a guide cavity 9. Then, the injection molding machine injects the molten metal into the injection cavity 5, and it flows from the injection cavity 5 into the inner cavity 8, and then through the guide cavity 9 into the upper mold module 6 and the lower mold module 7, until the cavity formed by the upper mold module 6, the lower mold module 7, the core rod 10, the bottom block 12, and the closing block 11 is filled. Then, the closing block 11 is moved to... The closing block 11 moves upward to close the guide cavity 9 and closes the upper feed port 602 inside the upper molded module 6. This prevents the injection melt inside the upper molded module 6 and the lower molded module 7 from connecting with the residual injection melt inside the injection cavity 5. Consequently, no extra columnar protrusions are formed on the surface of the thin-walled columnar part after cooling. Therefore, it is not necessary to remove the columnar protrusions formed on the surface of the thin-walled columnar part. Only simple grinding of the thin-walled columnar part is required, which reduces labor consumption.

[0038] Furthermore, the core rod 10 includes a fixing rod 101 and a connecting block 102 and a fixing block 103. The fixing block 103 is fixedly connected to the inner wall of the fixed mold 2. The top of the fixing block 103 is fixedly connected to the bottom of the connecting block 102. The upper end of the connecting block 102 passes through the bottom block 12 and is fixedly connected to the fixing rod 101. The fixing rod 101 is located inside the upper mold module 6 and the lower mold module 7.

[0039] The design of the core rod 10 allows the connecting block 102 to fix the fixing rod 101 inside the lower mold module 7 and the upper mold module 6 through the fixing block 103, thereby fixing the core rod 10 as a whole within the fixed mold 2 and preventing it from separating.

[0040] Example 2, as Figures 2-7As shown, the fixed mold 2 has a bottom opening 14 inside, and an electric telescopic rod 25 is fixed inside the bottom opening 14. The output end of the electric telescopic rod 25 is connected to a connecting rod 24. The upper end of the connecting rod 24 is fixedly connected to a movable disk 21. The top of the movable disk 21 is fixedly connected to the bottom of the closing block 11. The bottom block 12 has a convex groove 15 inside, and a convex block 16 is movably sleeved inside the convex groove 15. The bottom of the convex block 16 is fixedly connected to an insert block 17. The fixed mold 2 has a slot 18 inside. One end of the insert block 17 extends into the slot 18 and is movably sleeved with the inner wall of the slot 18. One end of the insert block 17 is hinged to a first hinge block 19. The other end of the first hinge block 19 is hinged to the closing block 11. A second hinge block 20 is hinged to the first hinge block 19. The other end of the second hinge block 20 is hinged to a moving rod 13. The upper end of the moving rod 13 passes through the fixed mold 2 and extends into the inner cavity 8.

[0041] By activating the electric telescopic rod 25, the connecting rod 24 moves the closing block 11 upward via the moving disk 21, thereby closing the guide cavity 9. Simultaneously, the closing block 11 pushes the insert block 17 into the slot 18 via the first hinge block 19, and the insert block 17 moves the convex block 16 along the inner wall of the convex groove 15. During the process of the first hinge block 19 pushing the insert block 17, the first hinge block 19 pulls the moving rod 13 downward along the inner wall of the inner cavity 8 via the second hinge block 20, thereby increasing the internal cavity area of ​​the inner cavity 8. This allows the closing block 11 to squeeze the injection melt inside the guide cavity 9 into the inner cavity 8, preventing the injection melt from flowing back from the injection chamber 5 and causing waste.

[0042] Example 3, as Figures 2-8 As shown, a cylinder 22 is movably sleeved on the outer surface of the connecting rod 24. A side cavity block 23 is fixedly connected to the lower end of the cylinder 22 at equal intervals in an annular shape. The side of the side cavity block 23 is fixedly connected to the side of the bottom opening 14. An air guide pipe 26 is fixedly connected to the interior of the upper end of the side cavity block 23. The other end of the air guide pipe 26 contacts the side of the bottom block 12. There are four sets of air guide pipes 26, and each set of air guide pipes 26 is located at both ends of the bottom block 12.

[0043] After the thin-walled automotive columnar parts inside the upper mold module 6 and lower mold module 7 are cooled and formed, the drive mechanism on the injection molding machine drives the moving mold 3 away from the fixed mold 2, thereby causing the fixed mold 2 to pull the upper mold module 6 away from the cooled thin-walled automotive columnar parts. Then, by activating the electric telescopic rod 25, the connecting rod 24 drives the moving disc 21 to move into the cylinder 22. When the moving disc 21 closes the cylinder 22 and then moves again, the moving disc 21 compresses the air inside the cylinder 22 and ejects it through the side cavity block 23 and the air guide pipe 26. As the moving disk 21 moves downward, it drives the closing block 11 to move downward along the inner wall of the upper feed port 602, the lower feed port 702, and the fixed mold 2. This causes the closing block 11 to pull the insert block 17 out of the slot 18 via the first hinge block 19, and causes the insert block 17 to drive the convex block 16 to move along the inside of the convex groove 15. When the first hinge block 19 pulls the insert block 17 out of the slot 18, the first hinge block 19 will push the moving rod 13 along the inner cavity via the second hinge block 20. The inner wall of cavity 8 moves upward, causing the moving rod 13 to push out the cooled injection molten material inside cavity 8. When the insert block 17 disengages from the slot 18, the closing block 11 continues to pull the first hinge block 19 downward. This causes the first hinge block 19 to pull the bottom block 12 downward along the outer surface of the connecting block 102 via the insert block 17, the convex block 16, and the convex groove 15. Consequently, the bottom block 12 gradually opens a closed cavity at the bottom of a thin-walled cylindrical automotive component. This closed cavity consists of the bottom block 12, the closing block 11, and the connecting block 12. The inner wall of the fixed mold 2 is formed by blocking the thin-walled columnar part of the car. Then, due to the movement of the bottom block 12, the air guide pipe 26 is connected to the cavity, so that the gas ejected from the air guide pipe 26 can be introduced into the closed cavity to push the thin-walled columnar part of the car. This allows the gas inside the closed cavity to uniformly compress the thin-walled columnar part of the car until it is pushed out of the inside of the thin-walled columnar part, thereby achieving the purpose of uniformly pushing out the thin-walled columnar part of the car and reducing the possibility of deformation or even breakage of the thin-walled columnar part of the car due to uneven force.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An injection mold for a thin-walled cylindrical part of an automobile, comprising a mounting block (1), a fixed die (2) being mounted on the top of the mounting block (1), a guide column (4) being movably sleeved in the inside of the fixed die (2), a movable die (3) being fixed on the upper end of the guide column (4), and an injection cavity (5) being formed in the inside of the movable die (3), characterized in that, The fixed mold (2) and the moving mold (3) are fitted together to form an inner cavity (8) and a guide cavity (9). The lower mold module (7) is fixedly fixed in the inner ring at equal intervals inside the fixed mold (2). The upper mold module (6) is fixedly fixed in the inner ring at equal intervals inside the moving mold (3). The upper mold module (6) and the lower mold module (7) correspond to each other. A bottom block (12) is installed at the bottom of the lower mold module (7). A core rod (10) located inside the upper mold module (6) and the lower mold module (7) is provided on the bottom block (12). A closing block (11) extending into the lower mold module (7) and the bottom block (12) is movably sleeved inside the fixed mold (2). The lower mold module (7) includes a lower mold body (701) and a lower feed port (702). The lower mold body (701) is fixedly sleeved with the inner wall of the fixed mold (2). The lower feed port (702) is opened inside the lower mold body (701) and movably sleeved with the closing block (11). The upper mold module (6) includes an upper mold body (601) and an upper feed port (602). The upper mold body (601) is fixedly sleeved with the inner wall of the moving mold (3). The upper feed port (602) is opened in the upper mold body (601) and communicates with the guide cavity (9). The upper feed port (602) corresponds to the lower feed port (702). The fixed mold (2) has a bottom opening (14) inside, and an electric telescopic rod (25) is fixed inside the bottom opening (14). The output end of the electric telescopic rod (25) is connected to a connecting rod (24). The upper end of the connecting rod (24) is fixedly connected to a moving disk (21). The top of the moving disk (21) is fixedly connected to the bottom of the closing block (11). The bottom block (12) has a convex groove (15) inside, and a convex block (16) is movably fitted inside the convex groove (15). The bottom of the convex block (16) is fixedly connected to an insert block (17). The fixed mold (2) has a slot (18) inside. One end of the insert (17) extends into the slot (18) and is movably sleeved with the inner wall of the slot (18). One end of the insert (17) is hinged with a first hinge block (19), and the other end of the first hinge block (19) is hinged with a closing block (11). The outer surface of the connecting rod (24) is movably sleeved with a cylinder (22). The lower end of the cylinder (22) is circumferentially and equidistantly connected with a side cavity block (23). The side of the side cavity block (23) is fixedly connected with the side of the bottom opening (14). The upper end of the side cavity block (23) is fixedly connected with a duct (26). The other end of the duct (26) is in contact with the side of the bottom block (12).

2. The injection mold for a thin-walled cylindrical automotive part according to claim 1, characterized in that, The core rod (10) includes a fixing rod (101), a connecting block (102), and a fixing block (103). The fixing block (103) is fixedly connected to the inner wall of the fixed mold (2). The top of the fixing block (103) is fixedly connected to the bottom of the connecting block (102). The upper end of the connecting block (102) passes through the bottom block (12) and is fixedly connected to the fixing rod (101). The fixing rod (101) is located inside the upper mold module (6) and the lower mold module (7).

3. The injection mold for a thin-walled cylindrical automotive part according to claim 2, characterized in that, A second hinge block (20) is hinged to the first hinge block (19), and a moving rod (13) is hinged to the other end of the second hinge block (20). The upper end of the moving rod (13) passes through the fixed mold (2) and extends into the interior of the inner cavity (8).

4. The injection mold for a thin-walled cylindrical automotive part according to claim 3, characterized in that, The number of air guide tubes (26) is four sets, and each set of air guide tubes (26) is located at both ends of the bottom block (12).

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