Pin-point gate cold runner injection mold

Abstract

The utility model discloses a pin-point gate cold runner injection mold which comprises a top mold plate, a runner mold plate, a fixed mold plate, a movable mold plate, a positioning mold plate and a bottom mold plate, a mold core mechanism for forming a molded part is arranged in a mold cavity formed by fixedly connecting the fixed mold plate and the movable mold plate, and the mold core mechanism comprises a front mold core plate, a front inner mold plate, a suction cup and a rear inner mold plate. The front mold core plate is fixedly connected with the front inner mold plate through a plurality of bolts, the suction cup is located above a molded part in the rear inner mold plate and located below a plurality of water conveying pipes in the upper row, and a plurality of communicated melting runners different in shape are designed on the front inner mold plate and used for flowing of polymers in the molten state. A plurality of through holes leading to the lower part mold cavity are formed in the melting runner, a polymer in a molten state flows to the part mold cavity, a plurality of water conveying pipes in the upper row transversely penetrate through the two ends of the front inner mold plate and then extend to the side end of the fixed mold plate, and a plurality of water conveying pipes in the lower row extend to the side end of the fixed mold plate from the bottom face of the rear inner mold plate. The problem of flatness of the medium-sized part in the background technology is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic molds, in particular to a cold runner injection mold with a fine sprue. Background Art

[0002] Injection molds are processing tools used in the mass production of parts, primarily in industrial manufacturing. The injection mold process involves injecting a molten polymer into the mold cavity under high pressure, cooling and solidifying it to produce the final product. The mold is then opened and the molded part is removed. Computer keyboards typically have approximately one hundred physical keys that need to be mounted within the hollow frame of the keyboard housing (molded part). This requires a high level of flatness. To accommodate mini-computers, the overall size of the keyboard is significantly reduced, placing even higher demands on the flatness of the housing. To meet this requirement, an injection mold has been developed to mass-produce keyboard housings. Utility Model Content

[0003] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0004] A cold runner injection mold with a fine water gate comprises a top template, a runner template, a fixed template, a movable template, a positioning template and a bottom template. A core mechanism for molding a molded part is provided in a mold cavity formed by a fixed connection between the fixed template and the movable template. The core mechanism comprises a front mold plate, a front inner template, a suction cup and a rear inner template. The front mold plate is fixedly connected to the front inner template by a number of bolts. The suction cup is located above the molded part in the rear inner template and below a number of water transport pipes in an upper row. The front inner template is designed with a number of connected molten runners of different shapes for the flow of molten polymer. Several through holes leading to the mold cavity below are used for the molten polymer to flow into the mold cavity. Bolts are fixed above the through holes, one end of the bolts is fixed to the hook pressure plate, and the other end is in conflict with the sprue part of the connecting mold. A crucian carp mouth is fixedly connected to the top opening of the front inner template. The molten polymer is injected into the molten flow channel through the crucian carp mouth and then flows into the mold cavity. The front inner template is fixed in the fixed template. Several water transport pipes in the upper row cross the two ends of the front inner template and extend to the side end of the fixed template. The rear inner template is fixed in the movable template. Several water transport pipes in the lower row extend from the bottom surface of the rear inner template to the side end of the fixed template.

[0005] Preferably, one end of the water transport pipe is an IN port, and the other end is an OUT port, and the front mold plate, the front inner mold plate and the side of the inner mold plate are provided with a first positioning block and a second positioning block.

[0006] Preferably, the fixed template, runner template and top template are sequentially sleeved on the upper half of the guide sleeve columns at the four corners, and the fixed template and the runner template are positioned and clamped by four spring bolts. The fixed template, runner template and top template are fixedly connected by an external pull plate, and the upper end of the external pull plate has three clamping columns for fixing the fixed template, the runner template and the top template.

[0007] Preferably, the four sides of the fixed template and the movable template are movably matched through upper positioning members and lower positioning members.

[0008] Preferably, the lower half of the guide sleeve column is sequentially covered with a movable template, a positioning template and a bottom template, and the movable template, the positioning template and the bottom template are fixed by six long bolts.

[0009] Preferably, a ejector rear plate and an ejector plate are fixed between the two positioning templates, and the ejector rear plate 7 and the ejector plate are fixedly connected by fixing bolts. The side ends and front faces of the ejector rear plate and the ejector plate are provided with first support heads, and the front faces are provided with second support heads. The first support heads are square and there are several of them of different sizes, and the second support heads are four cylindrical. The first support heads and the second support heads of different sizes are all fixed to the bottom template by short screws.

[0010] Preferably, three ejector rods are fixed to the ejector rear plate and the middle of the ejector plate, and the ejector rods pass through the rear inner template and extend into the mold cavity of the mold part.

[0011] Preferably, a plurality of ejectors are provided between the first support head and the second support head, and the plurality of ejectors pass through the ejector plate, the movable template and the rear inner template and extend into the mold cavity of the molded part.

[0012] Preferably, a heat insulation plate is fixed to the flow channel template by a plurality of screws.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The utility model can form a molded part (keyboard cover) by injection molding at one time through a mold core mechanism, that is, a structural design including a front mold core plate, a front inner template, a suction cup, a rear inner template and a plurality of water transport pipes. Each water transport pipe has an IN port and an OUT port. A plurality of water transport pipes penetrate and wind around the mold core mechanism to achieve efficient cooling of the mold core mechanism, effectively ensuring that the molded part is quickly cooled after the molten polymer is poured into the mold cavity. In the process of ejecting the molded part from the mold cavity after molding, the suction cup flatly adsorbs the molded part to avoid deformation and bending of the molded part.

[0015] A number of ejectors are arranged between the first support head and the second support head. The ejectors extend through the ejector plate, the movable template and the rear inner template into the mold cavity of the mold part. One end of the ejectors extends into the mold cavity. During the molding process of the mold part, the mold part is supported by multiple fulcrums to assist the movable template and the rear inner template to play a stabilizing role, thereby effectively preventing the mold part from deformation and bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structural diagram of the utility model;

[0017] Figure 2 It is the internal structure diagram of the upper half of the structure diagram of the utility model;

[0018] Figure 3 yes Figure 2 A top view of

[0019] Figure 4 yes Figure 2 A partial top view of

[0020] Figure 5 yes Figure 4 A partial top view of

[0021] Figure 6 This is a disassembled diagram of the mold core mechanism;

[0022] Figure 7 It is the structural diagram of the mold core mechanism;

[0023] Figure 8 It is the internal structure diagram of the lower half of the structure diagram of the utility model;

[0024] Figure 9 This is the setting structure diagram of the ejector;

[0025] In the figure: 1 top template, 2 runner template, 3 fixed template, 4 dynamic template, 5 positioning template, 6 bottom template, 7 ejector rear plate, 8 ejector plate, 9 outer pull plate, 10 upper positioning piece, 11 lower positioning piece, 12 crucian carp mouth, 13 insulation board, 14 guide sleeve column, 15 spring bolt, 16 hook needle pressure plate, 17 first positioning block, 18 front inner template, 180 melting runner, 19 bolt, 20 second positioning block, 21 front mold core, 22 rear inner template, 23 water transport pipe, 24 nozzle part, 25 suction cup, 26 long bolt, 27 fixing bolt, 28 first support head, 29 ejector, 30 short screw, 31 ejector rod, 32 second support head. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the implementation of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Please refer to Figure 1-Figure 7A fine-gate cold runner injection mold includes a top template 1, a runner template 2, a fixed template 3, a movable template 4, a positioning template 5 and a bottom template 6. A core mechanism for molding a molded part is provided in the mold cavity formed by the fixed template 3 and the movable template 4. The core mechanism includes a front mold plate 21, a front inner template 18, a suction cup 25 and a rear inner template 22. The front mold plate 21 is fixedly connected to the front inner template 18 by a number of bolts. The suction cup 25 is located above the molded part in the rear inner template 22 and below the upper row of water pipes 23. The molten polymer is cast into a molded part under a certain pressure and temperature. When the push rod pushes, the molded part is smoothly adsorbed by the suction cup and can be smoothly separated from the mold cavity. The front inner template 18 is designed with a number of interconnected molten runners 180 of different shapes for the flow of polymer in a molten state. The cold runner design is adopted here. The molten runner 180 is designed with several through holes leading to the mold cavity below, which are used for the molten polymer to flow to the mold cavity. A bolt 19 is fixed above the through hole. One end of the bolt 19 is fixed to the hook needle pressure plate 16, and the other end is in conflict with the sprue part 24 of the connected mold. The sprue part here is not a component of the mold. There are several bolts, which can stabilize the front inner template, the front mold core plate and the hook needle top plate to avoid the pressure generated when the injection molding machine nozzle injects the molten polymer, which may cause the mold to be squeezed and deformed or insufficiently fed during the molding process. A crucian carp mouth 12 is fixedly connected to the top opening of the front inner template 18. The molten polymer is injected into the molten flow channel 180 through the crucian carp mouth 12 and then flows into the mold cavity of the mold part. The front inner template 18 is fixed in the fixed template 3. Several water pipes 23 in the upper row cross the two ends of the front inner template 18 and extend to the side ends of the fixed template 3. The rear inner template 22 is fixed in the movable template 4. Several water pipes 23 in the lower row extend from the bottom surface of the rear inner template 22 to the side ends of the fixed template 3. One end of the water pipe 23 is an IN port and the other end is an OUT port. Cold water enters from the IN port of the upper row of water pipes to cool the front inner template, suction cup, and mold part and then flows out from the OUT port. Cold water enters from the IN port of the lower row of water pipes to cool the rear inner template and then flows out from the OUT port, effectively ensuring that the molten polymer is quickly cooled and formed after filling the cavity, and also reduces the temperature of the core mechanism.

[0028] Please refer to Figure 2-Figure 5 The front mold core plate 21, the front inner mold plate 18 and the inner mold plate 22 are provided with a first positioning block 17 and a second positioning block 20 on their sides. The first and second positioning blocks play a role in fixing the core mechanism, and can keep the core mechanism from displacement when the mold is subjected to the pressure and temperature applied by the injection molding machine during operation.

[0029] Please refer to Figure 1-Figure 3The fixed platen 3, runner platen 2, and top platen 1 are sequentially sleeved onto the upper halves of the guide sleeve columns 14 at the four corners. Four spring bolts 15 secure the fixed platen 3 and runner platen 2 together. These spring bolts are intended to reduce the collision force between the fixed and runner platen that could affect the stable operation of the core mechanism. The fixed platen 3, runner platen 2, and top platen 1 are securely connected via an external pull plate 9. Three clamping columns are located at the top of the external pull plate 9 to secure the fixed platen 3, runner platen 2, and top platen 1. The external pull plate secures the fixed, runner, and top platen together to achieve the mold's open and closed state.

[0030] Please refer to Figure 1 、 Figure 2 、 Figure 8 and Figure 9 The four sides of the fixed template 3 and the movable template 4 are movably matched by the upper positioning piece 10 and the lower positioning piece 11. During the injection molding process of the mold, the mold can be opened and closed with the upper and lower positioning pieces as the boundary to ensure the removal of the molten polymer molded mold.

[0031] Please refer to Figure 1 、 Figure 8 The lower half of the guide sleeve column 14 is sequentially covered with a movable template 4, a positioning template 5 and a bottom template 6, and the movable template 4, the positioning template 5 and the bottom template 6 are fixed by six long bolts 26.

[0032] Please refer to Figure 1 、 Figure 8 Between the two positioning templates 5, a pin back plate 7 and a pin plate 8 are fixed. The pin back plate 7 and the pin plate 8 are fixedly connected by fixing bolts 27. First supports 28 are provided on the side ends and front faces of the pin back plate 7 and the pin plate 8, and second supports 32 are provided on the front faces. The first supports 28 are square and of different sizes, and there are four second supports 32 in the shape of a column. The first supports 28 and the second supports 32 of different sizes are fixed to the bottom template 6 by short screws 30. The purpose of the multiple first and second supports is to stabilize the pin back plate and the pin plate from displacement and to provide support for the movable template.

[0033] Please refer to Figure 7 、 Figure 8 Three ejector pins 31 are fixed to the middle of the ejector rear plate 7 and the ejector plate 8. The ejector pins 31 extend through the rear inner mold plate 22 and into the mold cavity. The ejector pins are the main tool for removing the molded part from the mold cavity. When the top cylinder of the injection molding machine pushes the bottom mold plate, the ejector pins directly push the molded part out of the mold cavity.

[0034] Please refer to Figure 1 、 Figure 6 、 Figure 7-Figure 9Several ejector pins 29 are positioned between the first support head 28 and the second support head 32. These pins extend through the ejector plate 8, the movable platen 4, and the rear inner platen 22 into the mold cavity. These ejector pins extend into the mold cavity at one end, supporting the mold at multiple points during the molding process and stabilizing the movable platen and rear inner platen, effectively preventing deformation and bending.

[0035] Please refer to Figure 1 A heat shield 13 is fixed to the runner template 2 by several screws. When the injection molding machine injects the molten polymer into the crucian carp mouth, the injection molding machine easily conducts a large amount of heat to the mold, causing the pressure and temperature of the mold cavity to exceed the set threshold value, causing the molded part to malfunction. The heat shield can effectively prevent this phenomenon from happening.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A cold runner injection mold with a narrow sprue, characterized by: The invention comprises a top template (1), a flow channel template (2), a fixed template (3), a movable template (4), a positioning template (5) and a bottom template (6); a core mechanism for molding a molded part is arranged in a mold cavity formed by a fixed connection between the fixed template (3) and the movable template (4); the core mechanism comprises a front mold plate (21), a front inner template (18), a suction cup (25) and a rear inner template (22); the front mold plate (21) is fixedly connected to the front inner template (18) by a plurality of bolts; the suction cup (25) is located above the molded part in the rear inner template (22) and below a plurality of water transport pipes (23) in an upper row; the front inner template (18) is designed with a plurality of connected molten flow channels (180) of different shapes for the flow of molten polymer; the molten flow channel (180) is designed with a plurality of openings to the molded part; The through hole of the lower mold cavity is used for the molten polymer to flow into the mold cavity. A bolt (19) is fixed above the through hole. One end of the bolt (19) is fixed to the hook needle pressure plate (16), and the other end is in conflict with the water outlet portion (24) of the connecting mold. The top opening of the front inner template (18) is fixedly connected with a crucian carp mouth (12). The molten polymer is injected into the molten flow channel (180) through the crucian carp mouth (12) and then flows into the mold cavity. The front inner template (18) is fixed in the fixed template (3). The upper row of several water transport pipes (23) crosses the two ends of the front inner template (18) and extends to the side end of the fixed template (3). The rear inner template (22) is fixed in the movable template (4). The lower row of several water transport pipes (23) extends from the bottom surface of the rear inner template (22) to the side end of the fixed template (3).

2. The cold runner injection mold with a narrow sprue according to claim 1, characterized in that: One end of the water transport pipe (23) is an IN port, and the other end is an OUT port. The sides of the front mold plate (21), the front inner template (18) and the inner template (22) are provided with a first positioning block (17) and a second positioning block (20).

3. The cold runner injection mold with a narrow sprue according to claim 1, characterized in that: The fixed mold plate (3), the flow channel mold plate (2) and the top mold plate (1) are sequentially sleeved on the upper halves of the guide sleeve columns (14) at the four corners. The fixed mold plate (3) and the flow channel mold plate (2) are positioned and clamped by four spring bolts (15). The fixed mold plate (3), the flow channel mold plate (2) and the top mold plate (1) are fixedly connected by an external pull plate (9). The upper end of the external pull plate (9) has three clamping columns for fixing the fixed mold plate (3), the flow channel mold plate (2) and the top mold plate (1).

4. The cold runner injection mold with a narrow sprue according to claim 1, characterized in that: The four sides of the fixed plate (3) and the movable plate (4) are movably matched through an upper positioning piece (10) and a lower positioning piece (11).

5. The cold runner injection mold with a narrow sprue according to claim 3, characterized in that: The lower half of the guide sleeve column (14) is sequentially covered with a movable template (4), a positioning template (5) and a bottom template (6), and the movable template (4), the positioning template (5) and the bottom template (6) are fixed by six long bolts (26).

6. The cold runner injection mold with a narrow sprue according to claim 1, characterized in that: A thimble rear plate (7) and a thimble plate (8) are fixed between the two positioning templates (5), and the thimble rear plate (7) and the thimble plate (8) are fixedly connected by fixing bolts (27). The side ends and front faces of the thimble rear plate (7) and the thimble plate (8) are provided with first support heads (28), and the front faces are provided with second support heads (32). The first support heads (28) are square and there are several of them in different sizes. The second support heads (32) are four cylindrical. The several first support heads (28) and second support heads (32) in different sizes are fixed to the bottom template (6) by short screws (30).

7. The cold runner injection mold with a narrow sprue according to claim 6, characterized in that: Three ejector rods (31) are fixed in the middle of the ejector rear plate (7) and the ejector plate (8), and the ejector rods (31) pass through the rear inner template (22) and extend into the mold cavity of the molded part.

8. The cold runner injection mold with a narrow sprue according to claim 6, characterized in that: A plurality of ejector pins (29) are provided between the first support head (28) and the second support head (32), and the plurality of ejector pins (29) pass through the ejector plate (8), the movable template (4) and the rear inner template (22) and extend into the mold cavity of the molded part.

9. The cold runner injection mold with a narrow sprue according to claim 1, characterized in that: A heat insulation plate (13) is fixed to the flow channel template (2) via a plurality of screws.

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