An injection mold

Abstract

The present invention relates to the technical field of injection molding, and discloses an injection mold, comprising: a fixed template; a movable template, which is attached to the lower surface of the fixed template and can move up and down relative to the fixed template, and an injection cavity is vertically arranged on the movable template; a movable insert block, which includes a matching part and a wedge part, the top part of the matching part is inserted into the injection cavity, and the movable insert block can move up and down relative to the movable template; a first sliding block, which is provided with a first inclined surface, and the first inclined surface is matched with the inclined surface on one side of the wedge part; a second sliding block, which is provided with a second inclined surface, and the second inclined surface is matched with the inclined surface on the other side of the wedge part; a driving assembly, which can drive the first sliding block and the second sliding block to approach or move away from each other. This injection mold does not need to be provided with a support piece at the bottom of the injection mold, and uses the driving assembly to move the movable insert block up and down, which can reduce the labor intensity and improve the production efficiency. It realizes automatic injection production and improves the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly to an injection mold. Background Art

[0002] When injection molding large-thickness plate-like workpieces, due to the very large thickness of the workpieces and the process defects of thermoplastic materials themselves, serious shrinkage marks, pores and other problems are likely to occur. To solve this problem, the current method is to perform layered multi-stage continuous injection molding. After injecting one layer, cooling is first carried out. After cooling to a certain temperature, the next layer is injected.

[0003] As Figure 1 shown, the existing injection mold includes a fixed template 10, a movable template 20 and a movable block 30. The movable block 30 is placed in the movable template 20 in a matching manner, and the movable block 20 can slide in the vertical direction. A plurality of layers of support sheets 40 are padded under the movable block 30. After injecting each layer, one layer of the support sheet 40 is removed, and the movable block 30 will drop a certain height to make the injection cavity larger, and then the next layer is injected until the entire workpiece is injected.

[0004] However, this method has a large labor intensity, low production efficiency, and the mold structure has a large size and many parts, and the structure is unstable.

[0005] Therefore, there is an urgent need for an injection mold to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide an injection mold, which can reduce the labor intensity and operation safety, and improve the production efficiency.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] Provide an injection mold, including:

[0009] A fixed template;

[0010] A movable template, which is attached to the lower surface of the fixed template and can move up and down relative to the fixed template, and an injection cavity is provided on the movable template;

[0011] A movable insert block, which includes a matching part and a wedge part. The top part of the matching part is inserted into the injection cavity, and the movable insert block can move up and down relative to the movable template;

[0012] A first sliding block, which is provided with a first inclined surface, and the first inclined surface is matched with the inclined surface on one side of the wedge part;

[0013] A second sliding block, which is provided with a second inclined surface, and the second inclined surface is matched with the inclined surface on the other side of the wedge part;

[0014] A driving assembly capable of driving the first sliding block and the second sliding block to approach or move away from each other.

[0015] Preferably, an elastic mechanism is provided between the moving template and the movable insert, and the elastic mechanism can drive the movable insert to move downward relative to the moving template.

[0016] Preferably, the elastic mechanisms are provided on both sides of the mating portion.

[0017] Preferably, it further includes a bottom support assembly, which includes a bottom plate and two support blocks fixed on the bottom plate. The two support blocks are respectively located on both sides of the first sliding block, and both sides of the first sliding block are slidably connected to the two support blocks respectively. Both sides of the second sliding block are slidably connected to the two support blocks respectively.

[0018] Preferably, the driving assembly includes a driving motor, a forward and reverse lead screw, a first lead screw nut and a second lead screw nut. The first lead screw nut is arranged on the first sliding block, and the second lead screw nut is arranged on the second sliding block. The first lead screw nut is screwed on the left-handed thread section of the forward and reverse lead screw, and the second lead screw nut is screwed on the right-handed thread section of the forward and reverse lead screw. The driving motor can drive the forward and reverse lead screw to rotate so that the first sliding block and the second sliding block approach or move away from each other.

[0019] Preferably, a plurality of first cooling hole groups are arranged in the area of the fixed template close to the injection mold cavity, and a plurality of second cooling hole groups are arranged around the injection mold cavity on the moving template.

[0020] Preferably, a nozzle is arranged on the fixed template.

[0021] Preferably, a first continuous stepped step is arranged on the first inclined surface, a second continuous stepped step is arranged on the second inclined surface, a third continuous stepped step matching the first continuous stepped step is arranged on one inclined surface of the wedge portion, and a fourth continuous stepped step matching the second continuous stepped step is arranged on the other inclined surface.

[0022] Preferably, the included angle between the two surfaces of the first continuous stepped step is a right angle or an obtuse angle, and the included angle between the two surfaces of the second continuous stepped step is a right angle or an obtuse angle.

[0023] Preferably, limiting blocks are vertically arranged on both sides of the fixed template, limiting grooves are arranged on the limiting blocks, and limiting bolts connecting the limiting blocks are arranged at both ends of the movable insert.

[0024] Advantages of the present invention:

[0025] The two inclined surfaces of the wedge-shaped part of the movable insert can respectively cooperate with the first sliding block and the second sliding block to lock the movable insert relative to the moving template. During injection molding, the driving assembly is in a relatively static state and is not affected by the injection pressure.

[0026] This injection mold does not need to be provided with a support sheet at the bottom of the injection mold. It uses a driving assembly for driving, which can reduce labor intensity and improve production efficiency. This injection mold realizes automated injection production, and the structure of this injection mold is more stable, improving the service life. Moreover, there is no need to set up several layers of support sheets, which makes the overall structural size of the injection mold smaller, while reducing the parts of the injection mold and lowering the production cost. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of an injection mold in the prior art;

[0028] Figure 2 is a schematic structural diagram of the injection mold provided by the present invention;

[0029] Figure 3 is a schematic partial structure diagram of the injection mold provided by the present invention Figure 1 ;

[0030] Figure 4 is a schematic partial structure diagram of the injection mold provided by the present invention Figure 2 ;

[0031] Figure 5 is a schematic partial structure diagram of the injection mold provided by the present invention Figure 3 ;

[0032] Figure 6 is a cross-sectional view of the injection mold provided by the present invention;

[0033] Figure 7 is Figure 6 a partial enlarged view of the position A in

[0034] Figure 8 is a schematic structural diagram of the cooperation between the wedge-shaped part and the first sliding block provided by the present invention (the two surfaces of the first continuous stepped step form an obtuse angle).

[0035] In the figure: 10, fixed template; 20, moving template; 30, movable block; 40, support sheet;

[0036] 100, workpiece;

[0037] 1, fixed template; 11, first cooling hole group; 12, nozzle; 13, limit block; 131, limit groove; 14, guide bushing;

[0038] 2, moving template; 21, second cooling hole group; 22, guide rod;

[0039] 3. Movable insert block; 31. Fitting part; 32. Wedge part;

[0040] 41. First sliding block; 411. Guide block; 42. Second sliding block;

[0041] 5. Driving assembly; 51. Driving motor; 52. Forward and reverse lead screw;

[0042] 61. Spring; 62. Connecting rod;

[0043] 71. Bottom plate; 72. Support block; 721. Guide sleeve; 73. Limit rod; 74. Connecting plate; 75. Guide post. Detailed implementation mode

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0046] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0048] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0050] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0051] As Figure 2-6 shown, this embodiment discloses an injection mold, which includes a fixed template 1, a movable template 2, a movable insert 3, a first sliding block 41, a second sliding block 42 and a driving assembly 5.

[0052] The movable template 2 is arranged to fit against the lower surface of the fixed template 1. The fixed template 1 and the movable template 2 are opened to form a parting surface, and the parting surface is the top surface of the movable template 2 and the bottom surface of the fixed template. And the movable template 2 can move up and down relative to the fixed template 1. An injection cavity is arranged on the movable template 2 in the vertical direction. The movable insert 3 includes a mating portion 31 and a wedge portion 32. The top part of the mating portion 31 is inserted into the injection cavity, and the movable insert 3 can move up and down relative to the movable template 2. The first sliding block 41 is provided with a first inclined surface, and the first inclined surface cooperates with the inclined surface on one side of the wedge portion 32. The second sliding block 42 is provided with a second inclined surface, and the second inclined surface cooperates with the inclined surface on the other side of the wedge portion 32. The driving assembly 5 can drive the first sliding block 41 and the second sliding block 42 to approach or separate from each other.

[0053] Specifically, the length of the wedge portion 32 is greater than the width of the mating portion 31, facilitating the arrangement of the two inclined surfaces on the wedge portion 32. An elastic mechanism is provided between the moving template 2 and the movable insert 3, and the elastic mechanism can drive the movable insert 3 to move downward relative to the moving template 2. Elastic mechanisms are provided on both sides of the mating portion 31. Specifically, the elastic mechanism includes a connecting rod 62 and a spring 61 sleeved on the connecting rod 62. Blind step holes are provided on the upper surface of the wedge portion 32 and the lower surface of the moving template 2. The connecting rod 62 is inserted into the small-diameter section of the blind step hole, and both ends of the spring 61 are pressed against the step surface of the blind step hole. The connecting rod 62 can slide up and down in the blind step hole of the moving template 2 so that the connecting rod 62 can follow the movement of the movable insert 3. Two elastic mechanisms are arranged at intervals on each side of the mating portion 31, and the four elastic mechanisms are arranged in a rectangle, making the forces on the moving template 2 and the wedge portion 32 relatively uniform and preventing the mating portion 31 from tilting in the injection mold cavity. In other embodiments, the elastic mechanism can also be a cylinder or an oil cylinder, etc. (when the elastic mechanism can also be a cylinder or an oil cylinder, the limiting rod 73 may not be provided). Limiting rods 73 are also provided at both ends of the moving template 2. One end of the limiting rod 73 is exposed on the bottom surface of the moving template 2, and the exposed part is slidably arranged in a sliding sleeve in the sliding hole of the wedge portion 32, and can limit the movable insert 3 during the up and down movement of the movable insert 3 relative to the moving template 2.

[0054] Optionally, the injection mold further includes a bottom support assembly, which includes a bottom plate 71 and two support blocks 72 fixed on the bottom plate 71. The two support blocks 72 are respectively located on both sides of the first sliding block 41. Both sides of the first sliding block 41 are slidably connected to the two support blocks 72 respectively, and both sides of the second sliding block 42 are slidably connected to the two support blocks 72 respectively. Specifically, a guide groove is provided on the inner side of the support block 72, and guide blocks 411 that cooperate with the guide groove are provided on both sides of the first sliding block 41 and the second sliding block 42. Alternatively, a guide rail is provided on the inner side of the support block 72, and guide grooves that cooperate with the guide rail are provided on both sides of the first sliding block 41 and the second sliding block 42.

[0055] The top surfaces of the two support blocks 72 are fixedly connected through a connecting plate 74, and a connecting plate 74 is provided at each end of the support block 72.

[0056] The moving template 2 is arranged on the support block 72. A guide rod 22 is provided on the moving template 2, a guide groove is provided on the support block 72, and a guide sleeve 721 is provided in the guide groove. The guide rod 22 is exposed on the lower surface of the moving template 2, and the exposed part is inserted into the guide sleeve 721. Four guide rods 22 are provided on the moving template 2, and guide sleeves 721 that cooperate with the guide rods 22 are provided at both ends of the support block 72. The moving template 2 can move up and down relative to the support block 72 along the guide rod 22.

[0057] A guide pillar 75 is provided on the moving template 2, a guide pillar hole is provided on the fixed template 1, and a guide sleeve 14 is provided in the guide pillar hole. The part of the guide pillar 75 that protrudes from the moving template 2 after passing through the moving template 2 upward is inserted into the guide sleeve 14, and the fixed template 1 can move up and down relative to the moving template 2 along the guide pillar 75 for mold closing and mold opening.

[0058] In this embodiment, the driving assembly 5 includes a driving motor 51, a positive and negative lead screw 52, a first lead screw nut, and a second lead screw nut. The first lead screw nut is provided on the first sliding block 41, the second lead screw nut is provided on the second sliding block 42. The first lead screw nut is screwed on the left-handed thread section of the positive and negative lead screw 52, and the second lead screw nut is screwed on the right-handed thread section of the positive and negative lead screw 52. The driving motor 51 can drive the positive and negative lead screw 52 to rotate so that the first sliding block 41 and the second sliding block 42 approach or move away from each other.

[0059] In other embodiments, the driving assembly 5 includes two cylinders (or oil cylinders), and the first sliding block 41 and the second sliding block 42 are respectively arranged at the output ends of the two cylinders (or oil cylinders). Optionally, the driving assembly 5 is a rack and pinion mechanism or a gear motor mechanism.

[0060] Limit blocks 13 are vertically arranged on both sides of the fixed template 1. A limit groove 131 is provided on the limit block 13, and limit bolts connecting the limit blocks 13 are provided at both ends of the movable insert 3.

[0061] A nozzle 12 is provided on the fixed template 1. Through the nozzle 12 (the nozzle adopts the valve needle type hot runner injection molding method), molten plastic can be filled into the injection mold cavity to injection mold the workpiece 100.

[0062] A number of first cooling hole groups 11 are provided in the area of the fixed template 1 close to the injection mold cavity. The first cooling hole group 11 includes a coolant inlet hole and a coolant outlet hole that communicate with each other.

[0063] A number of second cooling hole groups 21 are provided around the injection mold cavity on the moving template 2. The second cooling hole group 21 includes a coolant inlet hole and a coolant outlet hole that communicate with each other. Coolant is passed through both the first cooling hole group 11 and the second cooling hole group 21. The coolant can dissipate heat from the fixed template 1 and the moving template 2, so that the injection molded workpiece 100 can be quickly cooled down to increase the injection molding speed.

[0064] A first continuous stepped step is provided on the first inclined surface, a second continuous stepped step is provided on the second inclined surface. For the two inclined surfaces of the wedge part 32, a third continuous stepped step that cooperates with the first continuous stepped step is provided on one of the inclined surfaces, and a fourth continuous stepped step that cooperates with the second continuous stepped step is provided on the other inclined surface.

[0065] In this embodiment, as Figure 7As shown, the included angle between the two surfaces of the first continuous stepped step is an obtuse angle. The upper surface of the first continuous stepped step is arranged horizontally, and the side surface is inclined outward. The height of the first continuous stepped step is h. In this embodiment, the two included angles of the second continuous stepped step are also obtuse angles. The upper surface of the second continuous stepped step is arranged horizontally, and the side surface is inclined outward. The height of the second continuous stepped step is h, 0.5h, 0.25h, or 0.125h. The third continuous stepped step is arranged to match the first continuous stepped step, and the fourth continuous stepped step is arranged to match the second continuous stepped step. In other embodiments, it may also be that the included angle between the two surfaces of the second continuous stepped step is a right angle or an obtuse angle.

[0066] In other embodiments, it may also be that the included angle between the two surfaces of the first continuous stepped step is a right angle. The upper surface of the first continuous stepped step is arranged horizontally, and the side surface is arranged vertically. The height of the first continuous stepped step is h. In this embodiment, the two included angles of the second continuous stepped step are also right angles. The upper surface of the second continuous stepped step is arranged horizontally, and the side surface is arranged vertically. The height of the second continuous stepped step is h, 0.5h, 0.25h, or 0.125h. The third continuous stepped step is arranged to match the first continuous stepped step, and the fourth continuous stepped step is arranged to match the second continuous stepped step. In other embodiments, it may also be that the included angle between the two surfaces of the second continuous stepped step is a right angle or an obtuse angle. During the injection molding process, both the first sliding block 41 and the second sliding block 42 are subjected to the vertically downward force of the movable insert 3, and the first sliding block 41 and the second sliding block 42 can cooperate to lock the movable insert 3.

[0067] Or, as Figure 8 shown, the included angle between the two surfaces of the first continuous stepped step is an obtuse angle. The upper surface of the first continuous stepped step is inclined downward and outward, and the side surface is inclined outward. The height of the first continuous stepped step is h. In this embodiment, the two included angles of the second continuous stepped step are also obtuse angles. The upper surface of the second continuous stepped step is inclined downward and outward, and the side surface is inclined outward. The height of the second continuous stepped step is h, 0.5h, 0.25h, or 0.125h. The third continuous stepped step is arranged to match the first continuous stepped step, and the fourth continuous stepped step is arranged to match the second continuous stepped step. In other embodiments, it may also be that the included angle between the two surfaces of the second continuous stepped step is a right angle or an obtuse angle.

[0068] After one injection molding, the driving assembly 5 drives the first sliding block 41 and the second sliding block 42 to move away from each other to release the locking of the moving template 2. The movable insert 3 moves downward a preset distance H (H is an integer multiple of h), and the first sliding block 41 and the second sliding block 42 continue to lock the movable insert 3. After the movable insert 3 descends, the injection cavity expands for the next injection molding.

[0069] When the number of injection molding operations reaches the limited N times, the total thickness D of the workpiece 100 at this time is D = N * H. The fixed template 1 is opened, and then the movable insert 3 moves upward to eject the workpiece 100.

[0070] The two inclined surfaces of the wedge part 32 of the movable insert 3 can cooperate with the first sliding block 41 and the second sliding block 42 respectively to lock the movable insert 3 relative to the moving template 2. During injection molding, the driving assembly 5 is in a relatively static state and is not affected by the injection pressure.

[0071] This injection mold does not need to be provided with a support piece at the bottom of the injection mold and uses the driving assembly 5 for driving, which can reduce the labor intensity and improve the production efficiency; moreover, the operation is safe and reliable. This injection mold realizes automatic injection molding production, and the structure of this injection mold is more stable, improving the service life. Moreover, there is no need to set several layers of support pieces, which makes the overall structural size of the injection mold smaller, reduces the parts of the injection mold, and lowers the production cost.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An injection mold, characterized in that, Comprising: Fixed template (1); Moving template (2), which is attached to the lower surface of the fixed template (1) and can move up and down relative to the fixed template (1). An injection molding cavity is provided on the moving template (2); Movable insert block (3), which includes a mating part (31) and a wedge part (32). The top part of the mating part (31) is inserted into the injection molding cavity, and the movable insert block (3) can move up and down relative to the moving template (2); First sliding block (41), which is provided with a first inclined surface that mates with the inclined surface on one side of the wedge part (32); Second sliding block (42), which is provided with a second inclined surface that mates with the inclined surface on the other side of the wedge part (32); Drive assembly (5), which can drive the first sliding block (41) and the second sliding block (42) to move closer to or away from each other; An elastic mechanism is provided between the moving template (2) and the movable insert block (3), and the elastic mechanism can drive the movable insert block (3) to move downward relative to the moving template (2); The elastic mechanisms are provided on both sides of the mating part (31); A first continuous stepped step is provided on the first inclined surface, a second continuous stepped step is provided on the second inclined surface, a third continuous stepped step that mates with the first continuous stepped step is provided on one inclined surface of the wedge part (32), and a fourth continuous stepped step that mates with the second continuous stepped step is provided on the other inclined surface; 2. The injection mold according to claim 1, characterized in that, It further includes a bottom support assembly, which includes a bottom plate (71) and two support blocks (72) fixed on the bottom plate (71). The two support blocks (72) are respectively located on both sides of the first sliding block (41), and both sides of the first sliding block (41) are slidably connected to the two support blocks (72). Both sides of the second sliding block (42) are slidably connected to the two support blocks (72); 3. The injection mold according to claim 1, wherein, The drive assembly (5) includes a drive motor (51), a positive and reverse lead screw (52), a first lead screw nut and a second lead screw nut. The first lead screw nut is arranged on the first sliding block (41), the second lead screw nut is arranged on the second sliding block (42). The first lead screw nut is screwed onto the left-handed thread section of the positive and reverse lead screw (52), the second lead screw nut is screwed onto the right-handed thread section of the positive and reverse lead screw (52), and the drive motor (51) can drive the positive and reverse lead screw (52) to rotate so that the first sliding block (41) and the second sliding block (42) move closer to or away from each other; 4. The injection mold according to claim 1, characterized in that, A number of first cooling hole groups (11) are provided in the area of the fixed template (1) close to the injection molding cavity, and a number of second cooling hole groups (21) are provided around the injection molding cavity on the moving template (2); 5. The injection mold according to claim 1, characterized in that, A nozzle (12) is provided on the fixed template (1); 6. The injection mold according to claim 1, characterized in that, The included angle between the two surfaces of the first continuous stepped step is a right angle or an obtuse angle, and the included angle between the two surfaces of the second continuous stepped step is a right angle or an obtuse angle.

7. The injection mold according to claim 1, characterized in that, On both sides of the fixed template (1), limiting blocks (13) are vertically arranged, and limiting grooves (131) are arranged on the limiting blocks (13). Limiting bolts connecting the limiting blocks (13) are arranged at both ends of the movable insert block (3).

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