An injection mold for a bucket with in-mold rapid prototyping

Abstract

An in-mold rapid prototyping water bucket injection mold, comprising a front mold, a rear mold, a gating system, and an ejection mechanism. The front mold includes a panel, a front template, front modules, an inlay plate, a first insert, and a first insert block. The rear mold includes a rear template, square iron, rear modules, a second insert, and a second insert block. After the front mold and the rear mold are clamped, a first molding cavity for the injection molding of the bucket body and a second molding cavity for the injection molding of the handle are formed; the injection mold realizes the synchronous injection molding of the bucket body and the handle. After the injection is completed, the bucket body and the handle are assembled, and the product can be taken out after demolding. The mold structure is optimized, and the production efficiency of the product is improved.

Description

Technical Field

[0001] The present invention relates to an injection mold for a water bucket with in-mold rapid prototyping. Background Art

[0002] Plastic water buckets are commonly used in daily life. Conventional plastic water buckets include a bucket body and a handle. The handle is rotatably connected to the rim of the bucket body. Generally, the above-mentioned bucket body and handle are produced by injection molding using injection molds, and two sets of injection molds are required for the handle and the bucket body to achieve mass production.

[0003] Therefore, people began to study the injection molding of water buckets within a set of injection molds. For example, in the invention patent application with the application number 201910059538.2, an injection mold for a water bucket is disclosed. In this solution, the first cavity 50a is used to form the outer contour of the bucket body 1, and the second cavity 50b is used to form the outer contour of the handle 2. After molding, the bucket body 1 and the handle 2 are press-fitted through the side core-pulling mechanism 100 to complete in-mold assembly. Although this injection mold can achieve the press-fitting of the handle and the bucket body during the demolding process, a side core-pulling mechanism needs to be configured in the mold to complete the assembly process. Therefore, how to design an injection mold for a water bucket with direct in-mold injection molding is of great significance for optimizing the structure of the injection mold and further improving the efficiency. Summary of the Invention

[0004] In view of the deficiencies in the above problems, the present invention provides an injection mold for a water bucket with in-mold rapid prototyping. To achieve the above object, the present invention provides an injection mold for a water bucket with in-mold rapid prototyping, including a front mold. The front mold includes a panel, a front template, and a front module connected in sequence from right to left. An insert plate is provided on the left side of the front template. The front module and the insert plate together form a barrel-shaped receiving cavity.

[0005] A first notch is opened on the left end face of the front module, and a first insert is provided in the first notch. A first forming groove is machined on the lower part of the left side face of the first insert. First through holes are opened on the inner and outer sides of the first insert. A movable first insert block is provided in the first through holes. The first insert block is connected to the front module through a first compression spring. A forming groove I is machined on the first insert block.

[0006] A rear mold, the rear mold includes a rear template, a square iron, and a rear module connected in sequence from left to right. A convex portion extending into the receiving cavity is provided in the middle of the rear module.

[0007] A second notch is opened on the right end face of the rear module, and a second insert is provided in the second notch. A second forming groove is machined on the lower part of the right side face of the second insert. Second through holes are opened on the inner and outer sides of the second insert. A movable second insert block is provided in the second through holes. A forming groove II is machined on the second insert block. The second insert block is connected to the ejection mechanism.

[0008] When the front mold and the rear mold are closed, the convex portion, the first insert, and the second insert form a first molding cavity for injection molding of the barrel body in the accommodation cavity, and the first molding groove, the second molding groove, the molding groove I, and the molding groove II together form a second molding cavity for injection molding of the handle;

[0009] The first insert block has a first convex nozzle, the second insert block has a second convex nozzle, and the outer surfaces of the first convex nozzle and the second convex nozzle are conical surfaces;

[0010] The assembled barrel body and handle are obtained by direct injection molding in the first molding cavity and the second molding cavity. After the mold is demolded, the first insert block and the second insert block leave the positions of the card holes of the barrel body, and the required water bucket is obtained. The structural design of this injection mold is ingenious, eliminating the process of press-fitting inside the mold, further improving the production efficiency of the product. After the mold is closed, the inner wall surfaces of the first convex nozzle and the second convex nozzle are used to form the card joints of the handle, and the outer wall surfaces are used to form the card holes of the barrel body. During demolding, the first convex nozzle and the second convex nozzle are forcibly separated from the card holes, and the conical surface design avoids the scratches and deformation of the product caused by forced demolding.

[0011] Preferably, the water bucket injection mold further includes a pouring system, and the pouring system includes a hot runner plate, a first hot nozzle, a second hot nozzle, and a third hot nozzle. The first hot nozzle is connected to the injection machine nozzle. The hot runner plate is located in the front template. The first hot nozzle is communicated with the second hot nozzle and the third hot nozzle through the hot runner plate. Among them, the end face of the second hot nozzle is connected to the first molding cavity, and the third hot nozzle is connected to the second molding cavity;

[0012] In the above technical solution, the molten raw material first enters the first hot nozzle from the injection machine nozzle. The first hot nozzle transports the raw material to the second hot nozzle and the third hot nozzle through the hot runner plate. The raw material is respectively transported into the first molding cavity and the second molding cavity through the second hot nozzle and the third hot nozzle to realize synchronous injection molding of the two cavities. Secondly, the setting of the hot runner can improve the fluidity of the raw material, eliminate the sprue in the injection process, and achieve the effect of saving the raw material. At the same time, since the injection product is a thin-walled part, high-precision and high-quality products can be easily produced through the hot runner.

[0013] Preferably, the ejection mechanism includes a first top plate and a second top plate disposed between the rear template and the rear module. A plurality of T-shaped columns are fixed on the first top plate. A second compression spring is provided on the T-shaped columns. The second top plate is pressed against the first top plate by the acting force of the second compression spring. An ejection lever is provided between the first top plate and the second top plate. A track groove for the ejection lever to move is machined on the square iron;

[0014] In the above technical solution, the ejection lever is a force-consuming lever. When the ejection lever contacts the track groove, it can accelerate the ejection of the product.

[0015] Preferably, the ejection mechanism further includes a first ejector rod, a second ejector rod, and an ejector pin. The first ejector rod fixedly connects the first top plate and the second insert. The second ejector rod fixedly connects the second top plate and the second insert block. The ejector pin is fixedly connected to the second top plate, and the upper end of the ejector pin extends into the second molding cavity.

[0016] In the above technical solution, after the upper mold is demolded, the second ejector rod ejects the second insert block away from the second insert, and the ejector pin ejects the handle away from the second molding groove. The two are carried out synchronously.

[0017] Preferably, there are two ejector pins, and the two ejector pins are symmetrically distributed on both sides of the third hot nozzle.

[0018] In the above technical solution, the two ejector pins act on the middle position of the handle, which is convenient for stably ejecting the handle from the position of the second molding groove.

[0019] Preferably, an ejection cylinder is further fixed on the second top plate. The cylinder shaft of the ejection cylinder passes through the convex portion, and an ejection disc is installed at the shaft end of the cylinder shaft.

[0020] In the above technical solution, the ejection cylinder acts last to eject the barrel body and the handle at the same time, realizing the process of step-by-step demolding.

[0021] The beneficial effect of the present invention compared with the prior art is as follows: For the existing water bucket injection mold, the barrel body and the handle need to be assembled by press-fitting after being injection-molded separately in the mold. For the injection mold provided by this solution, after injection molding, the barrel body and the handle are assembled. Demolding can obtain the required water bucket. The mold structure is further optimized, and the efficiency of injection molding is further improved. Brief Description of the Drawings

[0022] Figure 1 Is a perspective view of the water bucket injection mold related to the present invention;

[0023] Figure 2 Is a front view of the water bucket injection mold related to the present invention;

[0024] Figure 3 Is a top view of the water bucket injection mold related to the present invention;

[0025] Figure 4 Is Figure 2 The cross-sectional view at the position of A-A in

[0026] Figure 5 IsFigure 3 Cross-sectional view at position B-B;

[0027] Figure 6 Exploded view of the water bucket injection mold related to the present invention;

[0028] Figure 7 Exploded view of the water bucket injection mold related to the present invention;

[0029] Figure 8 Schematic diagram of the first insert block;

[0030] Figure 9 Schematic diagram of the first insert block;

[0031] Figure 10 Schematic diagram of the second insert block;

[0032] Figure 11 Exploded view of the ejection mechanism;

[0033] Figure 12 Exploded view of the ejection mechanism;

[0034] Figure 13 Schematic diagram of the water bucket related to the present invention.

[0035] In the figure: 10, front mold; 101, panel; 102, front template; 103, front module; 104, inlay panel; 11, first insert; 111, first forming groove; 12, first insert block; 121, forming groove I; 122, first convex nozzle; 13, first compression spring; 20, rear mold; 201, rear template; 202, square iron; 2021, track groove; 203, rear module; 2031, protruding part; 21, second insert; 211, second forming groove; 22, second insert block; 221, forming groove II; 222, second convex nozzle; 30, first hot nozzle; 31, hot runner plate; 32, second hot nozzle; 33, third hot nozzle; 40, ejection mechanism; 41, first top plate; 42, second top plate; 43, second compression spring; 44, T-shaped column; 45, ejection lever; 46, first ejector rod; 47, second ejector rod; 48, ejector pin; 49, ejection cylinder; 50, ejection disc; 1, barrel body; 1a, clamping hole; 2, handle; 2b, clamping joint. Detailed implementation mode

[0036] As Figures 1 to 12As shown in the figure, an in-mold rapid prototyping water bucket injection mold according to an embodiment of the present invention includes a cooperating front mold 10 and a rear mold 20. The front mold 10 includes a panel 101, a front template 102, and a front module 103 connected in sequence from right to left. An insert plate 104 is provided on the left side of the front template 102. The front module 103 and the insert plate 104 together form a barrel-shaped receiving cavity. A first notch is formed on the left end face of the front module 103, and a first insert 11 is provided in the first notch. A first forming groove 111 is machined on the lower part of the left side face of the first insert 11. The first insert 11 is provided with first through holes on the inner and outer sides. A movable first insert block 12 is provided in the first through holes. The first insert block 12 is connected to the front module 103 through a first compression spring 13. A forming groove I121 is machined on the first insert block 12. The rear mold 20 includes a rear template 201, a spacer block 202, and a rear module 203 connected in sequence from left to right. A protruding portion 2031 extending into the receiving cavity is provided in the middle of the rear module 203. A second notch is formed on the right end face of the rear module 203, and a second insert 21 is provided in the second notch. A second forming groove 211 is machined on the lower part of the right side face of the second insert 21. The second insert 21 is provided with second through holes on the inner and outer sides. A movable second insert block 22 is provided in the second through holes. A forming groove II221 is machined on the second insert block 22. The second insert block 22 is connected to an ejection mechanism 40. When the front mold 10 and the rear mold 20 are closed, the protruding portion 2031, the first insert 11, and the second insert 21 form a first forming cavity for injection molding of the bucket body 1 in the receiving cavity. The first forming groove 111, the second forming groove 211, the forming groove I121, and the forming groove II221 together form a second forming cavity for injection molding of the handle 2. Among them, the water bucket injection mold further includes a gating system. The gating system includes a hot runner plate 31, a first hot nozzle 30, a second hot nozzle 32, and a third hot nozzle 33. The first hot nozzle 30 is connected to an injection machine nozzle. The hot runner plate 31 is located in the front template 102. The first hot nozzle 30 is communicated with the second hot nozzle 32 and the third hot nozzle 33 through the hot runner plate 31. Among them, the end face of the second hot nozzle 32 is connected to the first forming cavity, and the third hot nozzle 33 is connected to the second forming cavity. The molten raw material first enters the first hot nozzle from the injection machine nozzle. The first hot nozzle transports the raw material to the second hot nozzle and the third hot nozzle through the hot runner plate. The raw material is respectively transported into the first forming cavity and the second forming cavity through the second hot nozzle and the third hot nozzle to realize synchronous injection molding of the two cavities. Secondly, the setting of the hot runner can improve the fluidity of the raw material, eliminate the gate in the injection process, and achieve the effect of saving the raw material. At the same time, since the injection product is a thin-walled part, high-precision and high-quality products can be easily produced through the hot runner.The first insert 12 has a first protrusion 122, and the second insert 22 has a second protrusion 222. The outer surfaces of the first protrusion 122 and the second protrusion 222 are tapered surfaces. After the mold is closed, the inner wall surfaces of the first protrusion and the second protrusion are used to form the clamping joint 2b of the handle, and the outer wall surfaces are used to form the clamping hole 1a of the barrel body. When demolding, the first protrusion and the second protrusion are forced to leave the clamping hole. The design of the tapered surface avoids the strain and deformation of the product caused by forced removal; the ejection mechanism 40 includes a rear mold The first top plate 41 and the second top plate 42 are between the plate 201 and the rear module 203. A plurality of T-shaped columns 44 are fixed on the first top plate 41. A second compression spring 43 is provided on the T-shaped column 44. The second top plate 42 is tightly attached to the first top plate 41 by the action of the second compression spring 43. An ejection lever 45 is provided between the first top plate 41 and the second top plate 42. A track groove 2021 for the ejection lever 45 to move is processed on the square iron 202. The ejection lever is a laborious lever. The ejection lever and the track groove 2021 are connected to each other. When the groove contacts, the ejection of the product can be accelerated; the ejection mechanism 40 also includes a first ejector rod 46, a second ejector rod 47, and an ejector pin 48. The first ejector rod 46 connects the first ejector plate 41 to the second insert 21, the second ejector rod 47 connects the second ejector plate 42 to the second insert 22, the ejector pin 48 is connected to the second ejector plate 42, and the upper end of the ejector pin 48 extends into the second molding cavity. After the upper mold is demoulded, the second ejector rod ejects the second insert out of the second insert, and the ejector pin ejects the handle out of the second The two processes are performed synchronously; there are two ejector pins 48, which are symmetrically distributed on both sides of the third hot nozzle 33. The two ejector pins act on the middle position of the handle to stably eject the handle from the position of the second molding groove; an ejection cylinder 49 is also fixed on the second ejector plate 42, and the cylinder shaft of the ejection cylinder 49 passes through the protrusion 2031. The end of the cylinder shaft is equipped with an ejection disc 50. The ejection cylinder is the last to act, and the barrel body and the handle are ejected at the same time, realizing the process of step-by-step demoulding. ;

[0037] The assembled barrel body and handle are directly injection molded in the first molding cavity and the second molding cavity. After demolding, the first insert and the second insert leave the position of the clamping hole of the barrel body, and the desired bucket is obtained. The structural design of the injection mold is ingenious, which eliminates the process of press-fitting inside the mold, and the production efficiency of the product is further improved. In the existing injection mold for buckets, the barrel body and the handle are injection molded separately in the mold and press-fitting is required to complete the assembly of the two. After injection molding, the injection mold provided by the present invention completes the assembly of the barrel body and the handle, and the desired bucket is obtained by demolding. The mold structure is further optimized, and the efficiency of injection molding is further improved.

[0038] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0039] Combination Figure 4 , Figure 5 , Figure 6 ,Figure 7 After the front mold and the rear mold are closed, the convex portion 2031, the first insert 11, and the second insert 21 form a first molding cavity for injection molding the barrel body 1 in the accommodation cavity. The first molding groove 111, the second molding groove 211, the molding groove I121, and the molding groove II221 together form a second molding cavity for injection molding the handle 2. The molten raw material first enters the first hot nozzle from the injection machine nozzle. The first hot nozzle transports the raw material to the second hot nozzle and the third hot nozzle through the hot runner plate. The raw material is respectively transported into the first molding cavity and the second molding cavity through the second hot nozzle and the third hot nozzle, realizing the synchronous injection molding of the two cavities;

[0040] The demolding process of the injection mold is as follows:

[0041] The front mold moves relative to the rear mold, causing the outer wall of the bottom of the barrel to separate from the panel, and the outer wall of the barrel body to separate from the first insert. Under the elastic force of the first compression spring, the first insert block abuts against the edge of the barrel. When the first compression spring returns to its original length, the first insert block moves with the first insert of the front mold module, and the first convex nozzle 122 leaves the position of the clamping hole 1a of the barrel. The first insert block lags behind the first insert to be demolded. The step-by-step demolding effectively avoids the strain and deformation of the product structure. The demolding method of the first convex nozzle is forced demolding;

[0042] The injection molding machine ejects, causing the first top plate and the second top plate to move simultaneously. The first ejector rod fixed to the first top plate causes the second insert to be ejected a certain distance from the second notch of the rear mold module. The inner wall of the barrel body of the barrel separates from the convex portion 2031 of the rear mold module. Then, the ejector lever contacts the track groove of the square iron. The ejector lever plays a role in accelerating the ejection. The second top plate and the first top plate move relative to each other. The second ejector rod fixed to the second top plate ejects the second insert block so that the second insert block leaves the second insert. At the same time, the ejector pin fixed to the second top plate ejects the handle so that the handle leaves the position of the second molding groove. Finally, the ejector cylinder operates, and the ejector disc ejects the barrel, and the barrel is ejected together with the assembled handle to obtain the finished product.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An injection mold for a bucket with in-mold rapid prototyping, characterized in that: it includes a front mold (10), and the front mold (10) includes a panel (101), a front template (102), and a front module (103) connected in sequence from right to left. An insert plate (104) is provided on the left side of the front template (102), and the front module (103) and the insert plate (104) together form a barrel-shaped receiving cavity; a first notch is formed on the left end face of the front module (103), and a first insert (11) is provided in the first notch. A first forming groove (111) is machined on the lower part of the left side face of the first insert (11). The first insert (11) is provided with first through holes on the inner and outer sides, and a movable first insert block (12) is provided in the first through holes. The first insert block (12) is connected to the front module (103) through a first compression spring (13), and a forming groove I (121) is machined on the first insert block (12); a rear mold (20), and the rear mold (20) includes a rear template (201), a square iron (202), and a rear module (203) connected in sequence from left to right. A protruding portion (2031) extending into the receiving cavity is provided in the middle of the rear module (203); a second notch is formed on the right end face of the rear module (203), and a second insert (21) is provided in the second notch. A second forming groove (211) is machined on the lower part of the right side face of the second insert (21). The second insert (21) is provided with second through holes on the inner and outer sides, and a movable second insert block (22) is provided in the second through holes. A forming groove II (221) is machined on the second insert block (22), and the second insert block (22) is connected to an ejection mechanism (40); when the front mold (10) and the rear mold (20) are closed, the protruding portion (2031), the first insert (11), and the second insert (21) form a first forming cavity for injection molding of the bucket body (1) in the receiving cavity, and the first forming groove (111), the second forming groove (211), the forming groove I (121), and the forming groove II (221) together form a second forming cavity for injection molding of the handle (2); the first insert block (12) has a first protruding nozzle (122), the second insert block (22) has a second protruding nozzle (222), and the outer surfaces of the first protruding nozzle (122) and the second protruding nozzle (222) are conical surfaces.

2. The injection mold for a bucket with in-mold rapid prototyping according to claim 1, characterized in that: The water bucket injection mold further includes a pouring system, which includes a hot runner plate (31), a first hot nozzle (30), a second hot nozzle (32) and a third hot nozzle (33). The first hot nozzle (30) is connected to the injection machine nozzle. The hot runner plate (31) is located within the front template (102). The first hot nozzle (30) communicates with the second hot nozzle (32) and the third hot nozzle (33) through the hot runner plate (31). Wherein, the end face of the second hot nozzle (32) is connected to the first molding cavity, and the third hot nozzle (33) is connected to the second molding cavity.

3. The water bucket injection mold for in-mold rapid prototyping according to claim 2, characterized in that: The ejection mechanism (40) includes a first top plate (41) and a second top plate (42) disposed between the rear template (201) and the rear module (203). A plurality of T-shaped columns (44) are fixed on the first top plate (41). A second compression spring (43) is provided on the T-shaped column (44). The second top plate (42) is in close contact with the first top plate (41) by the acting force of the second compression spring (43). An ejection lever (45) is provided between the first top plate (41) and the second top plate (42). A track groove (2021) for the ejection lever (45) to move is machined on the square iron (202).

4. The water bucket injection mold for in-mold rapid prototyping according to claim 3, characterized in that: The ejection mechanism (40) further includes a first ejector rod (46), a second ejector rod (47), and an ejector pin (48). The first ejector rod (46) fixedly connects the first top plate (41) and the second insert (21). The second ejector rod (47) fixedly connects the second top plate (42) and the second insert block (22). The ejector pin (48) is fixedly connected to the second top plate (42), and the upper end of the ejector pin (48) extends into the second molding cavity.

5. The water bucket injection mold for in-mold rapid prototyping according to claim 4, characterized in that: There are two ejector pins. The two ejector pins (48) are symmetrically distributed on both sides of the third hot nozzle (33).

6. The water bucket injection mold for in-mold rapid prototyping according to claim 4 or 5, characterized in that: An ejection cylinder (49) is further fixed on the second top plate (42). The cylinder shaft of the ejection cylinder (49) passes through the convex portion (2031), and an ejection disc (50) is installed at the shaft end of the cylinder shaft.

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