CN106626265B - A button injection mold - Google Patents

Abstract

The invention discloses a key injection mold, comprising a front mold base bottom plate and a rear mold base bottom plate. The front mold base bottom plate includes a front mold base and a hot runner system, and a fixed mold core is fixedly arranged on the front mold base. The bottom plate of the rear mold base is provided with an ejection mechanism, a rear mold base, and a movable mold core arranged on the rear mold base, and a molding cavity is formed between the fixed mold core and the movable mold core, and is characterized in that: the hot runner system It includes a feed port connected with the injection molding machine, a hot runner plate connected with the feed port, a heating ring arranged around the hot runner plate, and several hot nozzles communicated with the molding cavity; the ejection mechanism includes a product ejection mechanism And the ejection mechanism of the material handle; the injection mold also includes a fixed mold waterway arranged on the fixed mold core and a movable mold waterway arranged on the movable mold core, the movable mold waterway adopts a single-circulation pipeline, and the fixed Dual circulation lines. It has the advantages of fast forming, low waste ratio and no substandard products.

Description

A button injection mold

technical field

The invention relates to the field of injection moulds, in particular to a key injection mould.

Background technique

In the injection molding production process, in order to improve the efficiency of injection molding, as much as possible is set in the mold, so that more products can be molded at one time, but the products are arranged too much. In order to ensure the quality of injection molding products, the requirements for injection molding machines become higher, At the same time the waste is relatively high. Figure 1 shows the layout of the mold for the production of this button. 8 sets of products are obtained in one mold opening. X-type runners and X-type secondary runners and cold flow are used for injection molding. Although the time for one injection molding is faster, However, the weight of the material is relatively high. The average weight of 8 products obtained by one injection is 2g, the weight of the material is 5g, and the waste ratio is 250%. A lot of raw materials are wasted. In order to improve the efficiency of injection molding, new injection molding must be developed. Mold, expand the number of products produced by one injection. If the previous injection method is still used, the cold runner system cannot adapt to the enlarged molding cavity. If the injection runner is added, the proportion of waste will inevitably increase. The hot runner system ensures that the plastic in the runner and gate remains molten by heating. The plastic melt in the hot runner system is conducive to pressure transfer, and the pressure loss in the runner is small, which can greatly reduce the injection pressure and mold clamping. It reduces the injection and pressure holding time, and it is easier to form large-scale plastics with a long process on a smaller injection machine. A smaller injection machine can be selected and the cost of the injection machine can be reduced, which strengthens the function of the injection machine and improves the Injection molding process. However, on the basis of expanding the number of injection molding by using the hot runner system, the cooling molding time will be prolonged, which will lead to the lengthening of the entire injection molding time. A brand new injection mold was developed, 8 sets of buttons were obtained at one time, and the molding time was shortened, which greatly improved the production efficiency.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a button injection mold, which has the advantages of fast molding, low waste ratio and no defective products.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a key injection mold, comprising a front mold base plate and a rear mold base bottom plate, the front mold base plate includes a front mold base and a hot runner system, and the fixed mold core is fixed It is arranged on the front mold frame, the bottom plate of the rear mold frame is provided with an ejection mechanism, a rear mold frame, and a movable mold core is arranged on the rear mold frame, and a molding cavity is formed between the fixed mold core and the movable mold core, It is characterized in that: the hot runner system includes a feed port connected with the injection molding machine, a hot runner plate connected with the feed port, a heating ring arranged around the hot runner plate, and several hot nozzles communicated with the molding cavity; The ejection mechanism includes a product ejection mechanism and a material handle ejection mechanism, and the action interval between the product ejection mechanism and the material handle ejection mechanism is 1-2s; the injection mold also includes a fixed mold waterway arranged on the fixed mold core. and a movable mold water path arranged on the movable mold core, the movable mold water path adopts a single circulation pipeline, and the fixed mold water path adopts a double circulation pipeline.

Further, the forming cavity includes two sets of symmetrical forming sub-cavities, each forming sub-cavity is provided with four sets of symmetrical key forming cavities, and each set of key forming cavities has two sets of key forming grooves arranged symmetrically in the center, and share one set of key forming grooves. The material handle, each set of key forming grooves is connected with the material handle through two gates, and each set of molding sub-cavities is connected with a hot nozzle.

Further, the ejection mechanism is arranged between the bottom plate of the rear mold base and the rear mold frame, and consists of an ejector plate, an ejector plate guard, a number of ejector pins, and a number of ejector pins, and the several ejector pins are respectively the first ejector pin, the second ejector pin The top of the ejector rod and the third ejector rod, the top of the corresponding first ejector pin is fixedly connected to the first ejector pin, the first ejector pin is arranged below each button, the top of the second ejector pin is fixedly connected to the second ejector pin, and the second ejector pin is arranged in the The button is connected to the bottom of the beam, the top of the third ejector pin is fixedly connected to the third ejector pin, and the third ejector pin is arranged below the material handle. Inside the ejector plate and in contact with the upper surface of the ejector plate guard plate, the end of the third ejector rod is T-shaped, and the ejector pin plate guard plate corresponding to the position of the third ejector pin is provided with an ejector rod hanging cavity, and the ejector pin The rod suspension cavity is a T-shaped cavity with a built-in movable ejector rod. One end of the ejector rod is in contact with the end of the third ejector rod, and the other end passes through the ejector plate guard plate and is in contact with the bottom plate of the rear mold base; The first ejector pin, the second ejector pin, the first ejector pin and the second ejector pin constitute the product ejection mechanism, and the third ejector pin, the third ejector pin and the ejector pin assist rod constitute the material handle ejection mechanism.

In the clamping state, the first ejector rod, the second ejector pin and the third ejector pin are in the horizontal position, the first ejector pin and the second ejector pin in the product ejection mechanism are in contact with the ejector plate guard, and the third ejector pin is in contact with the ejector plate. The ejector rod is in contact, and the other end of the ejector rod is in contact with the bottom plate of the rear mold base; when the mold is opened, the ejector plate is driven by the ejector guard to move upward, and the ejector plate drives the first ejector and the second ejector. The ejector rod moves upward, and the first ejector pin and the second ejector pin connected by the first ejector bar and the second ejector bar push the button and the button connecting beam upward, while the bottom of the third ejector bar is suspended, and the ejector pin plate and the ejector pin guard plate are upward. During the movement, the top of the third ejector rod is under the pressure of the material handle, and its end falls into the hanging cavity of the ejector rod, and does not move upward with it. This stage is the stage where the product ejection mechanism works to eject the product; with the continuous upward movement of the ejector pin plate and ejector pin guard, the ejector rod reaches the T-shaped bottom of the ejector rod suspension cavity, and it cannot continue to keep moving upward. At this time, the end of the third ejector rod is in contact with the ejector rod auxiliary rod. As the ejector pin plate and the ejector pin guard plate continue to move upward, the third ejector pin pushes the ejection handle to complete the movement of the ejection mechanism.

Further, the height of the top end of the ejector rod is lower than the depth of the T-shaped part of the ejector rod suspension cavity, and the difference between the two is 3mm, so that after the product ejector mechanism ejects the product by 3mm, the material handle ejection mechanism start working.

Further, each molding sub-cavity on the fixed mold core is provided with a fixed mold water path, and the fixed mold water path adopts a double-circulation pipeline, including a fixed mold water path and a fixed mold two water paths that are symmetrically arranged. A water pipeline forms a rectangular circulation pipeline, which enters from one end of the molding sub-cavity, passes through the material handle of the adjacent button molding cavity, and returns to the same end of the molding sub-cavity to complete a cycle; the fixed mold 2 The direction of the circulating water of the waterway is symmetrically arranged with the fixed die-waterway; each molding sub-cavity on the movable die core is provided with a movable die waterway, and the movable die waterway adopts a single circulation pipeline, and the water inlet and the water outlet are arranged at On one side of the movable mold core, a rectangular circulating pipeline is formed by the pipeline, and the path of the circulating water flows along the outer edge of the forming cavity,

Further, the movable mold water circuit further includes two circulation branches, and the circulation branches are arranged between the two groups of key forming cavities parallel to the key forming groove. When the mold is closed, the movable mold water channel and the fixed mold water channel surround the key forming groove in the entire molding cavity, which shortens the molding cooling time and improves the production efficiency.

Further, the pipe diameter of the circulation branch is larger than the pipe diameter of the movable mold water path. Since the circulation branch needs to cool the buttons on both sides, the pipe diameter is increased to accelerate the cooling, so that the setting speed is increased.

Further, the molding sub-cavity adopts an I-shaped sub-runner, and there are two gates for the sub-runner and the product.

Further, the gate directly between the material handle and the button forming groove is an inclined surface, so that the position of the material handle is higher than the position of the product. When the product is ejected first, the product and the material handle are quickly separated.

The advantages of the present invention are:

1. The mold ranking designed by the present invention can obtain 16 sets of products by one injection, the weight of the product is 4 grams, and the weight of the material is 3.5 grams, while the original mold is injected, and 8 sets of products are obtained in one mold, and the weight of 8 products is 2 grams, and the weight of the material is 2 grams. The weight is 5 grams, so the average material of a product can be saved by 65%;

2. The present invention adopts a hot runner system and optimizes the mold waterway. The cycle of injection molding a mold product is reduced from 15 seconds to 13 seconds, and the number of one mold is changed from 8 to 16, and the output per day is 2.3 times the original. ;

3. In order to solve the problem that the gate position remains large and the product is deformed when the product is ejected, the mold adopts a secondary ejection structure. The product is ejected first, and then the ejection handle is ejected. One ejector rod and the second ejector rod push out the product, the third ejector rod has a small ejector rod hanging in the air, and the head is subjected to the force of the material handle, and the third ejector rod does not move, thus realizing the first ejection of the product, The material handle is not ejected, which ensures that the gate position is clean and there is no residue; the injection molding machine continues to push the ejector plate to move up, the first ejector and the second ejector continue to eject the product, and the third ejector is due to the ejection of the bottom. The rod assist rod is no longer suspended, and the ejection handle is moved along with the ejector plate to complete the entire ejection process.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of mold arrangement in the prior art.

FIG. 2 is a schematic diagram of mold arrangement in the present invention.

FIG. 3 is a schematic diagram of the hot runner system in the present invention.

FIG. 4 is a schematic diagram of the fixed mold waterway of the present invention.

FIG. 5 is a schematic diagram of the movable mold water circuit of the present invention.

FIG. 6 is a schematic diagram of the ejector mechanism in the mold clamping state of the present invention.

FIG. 7 is a partial enlarged view of FIG. 6 of the present invention.

FIG. 8 is a schematic view of the present invention when the ejector mechanism in the mold-opening state ejects 3 mm.

FIG. 9 is a partial enlarged view of FIG. 8 of the present invention.

FIG. 10 is a schematic diagram of the present invention being completely ejected in the state of mold opening.

FIG. 11 is a partial enlarged view of FIG. 10 of the present invention.

Fig. 12 is a partial enlarged view of the product obtained by injection molding of the present invention.

in:

1. Feed port 2. Hot runner plate 3. Heating ring 4. Hot nozzle

5. Fixed mold waterway 6. Moving mold waterway 7. Forming cavity 8. Key forming cavity

9. Key forming groove 10. Gate 11. Material handle 12. Thimble plate

13, thimble plate guard 14, the first ejector rod 15, the second ejector rod 16, the third ejector rod

17. The first ejector pin 18, the second ejector pin 19, the third ejector pin 20, the ejector pin hanging cavity

21, ejector rod 22, fixed mold one waterway 23, fixed mold two waterway 24, circulation branch

25. Product 26. Moving mold core 27. Rear mold base 28. Rear mold base bottom plate

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

As shown in the figure, a key injection mold includes a front mold base and a rear mold base 28. The front mold base includes a front mold and a hot runner system. The fixed mold core is fixed on the front mold. The bottom plate 28 of the rear mold base is provided with an ejection mechanism, a rear mold base 27, and a movable mold core 26 arranged on the rear mold base. A molding cavity is formed between the fixed mold core and the movable mold core 26. In that: the hot runner system includes a feed port 1 connected with the injection molding machine, a hot runner plate 2 connected with the feed port 1, a heating ring 3 arranged around the hot runner plate 2, and a plurality of heat exchangers communicating with the molding cavity. Nozzle 4; the ejection mechanism includes a product ejection mechanism and a material handle 11 ejection mechanism, and the action interval between the product ejection mechanism and the material handle 11 ejection mechanism is 1 to 2s; the injection mold also includes a fixed mold. The fixed die waterway 5 on the core and the movable die waterway 6 arranged on the movable die core 26, the movable die waterway 6 adopts a single circulation pipeline, and the fixed die waterway 5 adopts a double circulation pipeline.

Further, the forming cavity includes two sets of symmetrical forming sub-cavities 7, each forming sub-cavity 7 is provided with four sets of symmetrical key forming cavities 8, and each set of key forming cavities 8 has two sets of centrally symmetrical key forming grooves. 9, and share a material handle 11, each set of key forming grooves 9 communicates with the material handle 11 through two gates 10, and each group of molding sub-cavities 7 is connected with a hot nozzle 4.

Further, the ejection mechanism is arranged between the bottom plate 28 of the rear mold base and the rear mold base, and consists of the ejector plate 12, the ejector plate guard 13, several ejector pins, and several ejector pins, and the several ejector pins are the first ejector pins respectively. 14. The second ejector bar 15 and the third ejector bar 16, the top of the corresponding first ejector bar 14 is fixedly connected to the first ejector pin 17, the first ejector pin 17 is arranged below each button, and the top of the second ejector bar 15 is fixed Connect the second thimble 18, the second thimble 18 is arranged below the key connection beam, the top of the third thimble 19 is fixedly connected to the third thimble 19, the third thimble 19 is arranged under the material handle 11, the first thimble 14 The end is T-shaped, the end of the second ejector rod 15 is L-shaped, both are arranged in the ejector plate 12, and are in contact with the upper surface of the ejector plate guard 13, and the end of the third ejector rod 16 is T-shaped, which is in contact with the first The ejector pin plate guards 13 corresponding to the positions of the three ejector pins 16 are provided with ejector pin suspension cavities 20 . The ejector pin suspension cavity 20 is a T-shaped cavity with a built-in movable ejector pin 21 . The ejector pin 21 One end is in contact with the end of the third ejector rod 16, and the other end passes through the ejector plate guard 13 and contacts with the rear mold base bottom plate 28; the first ejector pin 14, the second ejector pin 15, the first ejector pin 17, the second ejector pin 18 constitutes the product ejection mechanism, and the third ejector rod 16, the third ejector pin 19, and the ejector rod assist rod 21 constitute the material handle 11 ejection mechanism.

In the clamping state, the first ejector rod 14, the second ejector pin 15, and the third ejector pin 16 are in a horizontal position, and the first ejector pin 14 and the second ejector pin 15 in the product ejection mechanism are in contact with the ejector plate guard 13 , the third ejector rod 16 is in contact with the ejector rod assist rod 21, and the other end of the ejector rod assistant rod 21 is in contact with the rear mold base bottom plate 28; when the mold is opened, the ejector pin plate 12 is driven by the ejector pin guard plate, and moves upward, this When the ejector pin plate 12 drives the first ejector bar 14 and the second ejector bar 15 to move upward, the first ejector pin 17 and the second ejector pin 18 connected by the first ejector bar 14 and the second ejector bar 15 push the button and the button connecting beam upwardly. , and the bottom of the third ejector rod 16 is suspended. When the ejector pin plate 12 and the ejector pin guard plate move upward, the top of the third ejector rod 16 is pressed by the material handle 11, and its end falls into the ejector rod hanging cavity 20, and does not follow the pressure of the material handle 11. When it moves upward, the ejector rod 21 does not move upwards, so that the product 25 and the material handle 11 are separated and disconnected. This stage is the stage where the product ejection mechanism works to eject the product; As the plate continues to move upward, the ejector rod 21 reaches the T-shaped bottom of the ejector rod suspension cavity 20 and cannot continue to maintain the state of not moving upward. At this time, the end of the third ejector rod 16 contacts with the ejector rod 21. The thimble plate 12 and the thimble guard plate continue to move upward, and at this time, the third thimble 19 pushes the ejection handle 11 to complete the movement of the ejection mechanism of the material handle 11 .

Further, the height of the top of the ejector rod 21 is lower than the depth of the T-shaped part of the ejector rod suspension cavity 20, and the difference between the two is 3mm, so that after the product ejection mechanism ejects the product by 3mm, the material handle 11 The ejector mechanism begins to work.

Further, each molding sub-cavity 7 on the fixed mold core is provided with a fixed mold water path 5, and the fixed mold water path 5 adopts a double-circulation pipeline, including a fixed mold one water path 22 and a fixed mold two water paths 23 arranged symmetrically. , the fixed mold-water path 22 is formed by the pipeline into a rectangular circulation pipeline, which enters from one end of the molding sub-cavity 7, passes through the material handle 11 of the adjacent key molding cavity 8, and returns to the same end of the molding sub-cavity 7 , to complete a cycle; the direction of the circulating water of the fixed mold two waterway 23 is symmetrical with the fixed mold one waterway 22; the movable mold core 26 is provided with a movable mold waterway 6 on each molding sub-cavity 7, and the movable mold The mold water circuit 6 adopts a single circulation pipeline, and the water inlet and outlet are arranged on one side of the movable mold core 26, and a rectangular circulation pipeline is formed by the pipeline. The path of the circulating water flows along the outer edge of the molding sub-cavity 7,

Further, the movable mold water path 6 further includes two circulation branches 24 , and the circulation branches 24 are arranged between the two groups of button molding cavities 8 parallel to the button molding groove 9 . When the mold is closed, the movable mold water channel 6 and the fixed mold water channel 5 surround the button molding groove 9 in the entire molding cavity, which shortens the molding cooling time and improves the production efficiency.

Further, the pipe diameter of the circulation branch 24 is larger than the pipe diameter of the movable mold water path 6 . Since the circulation branch 24 needs to cool the buttons on both sides, the pipe diameter is increased to accelerate the cooling, so that the setting speed is increased.

Further, the molding sub-cavity 7 adopts an I-shaped sub-runner, and the sub-runner and the gate 10 of the product are two.

Further, the gate 10 directly between the material handle 11 and the button forming groove 9 is an inclined surface, so that the position of the material handle 11 is higher than the position of the product, and when the product is ejected, the product and the material handle 11 are quickly pushed out by first pushing out the product. separation.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (5)

1. A key injection mold, comprising a front mold base plate and a rear mold base plate, the front mold base plate includes a front mold base and a hot runner system, and a fixed mold core is fixedly arranged on the front mold base, and the rear mold The bottom plate of the frame is provided with an ejector mechanism, a rear mold base, and a movable mold core arranged on the rear mold base, and a molding cavity is formed between the fixed mold core and the movable mold core, and it is characterized in that: the hot runner system includes and A feed port connected to the injection molding machine, a hot runner plate connected to the feed port, a heating ring arranged around the hot runner plate, and several hot nozzles communicated with the molding cavity; the ejection mechanism includes a product ejection mechanism and a material The ejector mechanism, and the action interval between the product ejection mechanism and the material ejector mechanism is 1~2s; the injection mold also includes a fixed mold waterway set on the fixed mold core and a movable mold waterway set on the movable mold core. , the movable mold water circuit adopts a single-circulation pipeline, and the fixed mold water channel adopts a double-circulation pipeline; the molding cavity includes two sets of symmetrical molding sub-cavities, and each molding sub-cavity is provided with four sets of symmetrical key molding Each set of key forming cavities has two sets of key forming grooves arranged symmetrically in the center, and shares a material handle, each set of key forming grooves is connected with the material handle through two gates, and each group of forming sub-cavities is connected with a hot nozzle; The ejector mechanism is arranged between the bottom plate of the rear mold base and the rear mold frame, and consists of a thimble plate, a thimble plate guard, a number of ejector pins, and a number of ejector pins, and the several ejector pins are respectively the first ejector pin and the second ejector pin. , the third ejector pin, the top of the corresponding first ejector pin is fixedly connected to the first ejector pin, the first ejector pin is arranged below each button, the top of the second ejector pin is fixedly connected to the second ejector pin, and the second ejector pin is arranged on the button connection Below the beam, the top of the third ejector pin is fixedly connected to the third ejector pin, the third ejector pin is arranged below the material handle, the end of the first ejector pin is T-shaped, and the end of the second ejector pin is L-shaped, all of which are arranged on the ejector pin plate inside, and in contact with the upper surface of the ejector plate guard, the end of the third ejector is T-shaped, and the ejector plate guard corresponding to the position of the third ejector is provided with a ejector hanging cavity, and the ejector is suspended in the air The cavity is a T-shaped cavity with a built-in movable ejector rod. One end of the ejector rod is in contact with the end of the third ejector rod, and the other end passes through the ejector plate guard and contacts with the bottom plate of the rear mold base; the first The ejector pin, the second ejector pin, the first ejector pin and the second ejector pin constitute the product ejection mechanism, and the third ejector pin, the third ejector pin and the ejector pin assist rod constitute the material handle ejection mechanism; There are fixed mold water channels on the sub-cavities. The fixed mold water channel adopts double circulation pipelines, including a fixed mold water channel and a fixed mold two water channels that are symmetrically arranged. The fixed mold water channel forms a rectangular circulation pipe through the pipeline. The channel enters from one end of the molding sub-cavity, passes through the material handle of the adjacent button molding cavity, and returns to the same end of the molding sub-cavity to complete a cycle; the circulating water direction of the fixed mold two water channels is symmetrical with the fixed mold one water channel. The movable mold core is provided with a movable mold water circuit on each molding sub-cavity, and the movable mold water circuit adopts a single-circulation pipeline. Rectangular circulation pipeline, the path of circulating water flows along the outer edge of the molding cavity; the gate directly between the material handle and the button molding groove is an inclined surface, so that the position of the material handle At the position higher than the product, when the product is ejected, the product is quickly separated from the material handle by ejecting the product first. 2. A key injection mold according to claim 1, wherein the height of the top end of the ejector rod is lower than the depth of the T-shaped part of the ejector rod suspension cavity, and the difference between the two is 3mm, After the product ejection mechanism ejects the product by 3mm, the material handle ejection mechanism starts to work. 3. A button injection mold according to claim 1, wherein the movable mold water path further comprises two circulation branches, and the circulation branches are arranged between the two groups of button molding cavities parallel to the button molding groove. between. 4 . The key injection mold according to claim 3 , wherein the pipe diameter of the circulation branch is larger than the pipe diameter of the movable mold water circuit. 5 . 5 . The key injection mold according to claim 1 , wherein the molding sub-cavity adopts an I-shaped sub-runner, and there are two gates for the sub-runner and the product. 6 .