Delayed core-pulling spraying structure

Abstract

The delayed core-pulling spraying structure comprises a rear mold, an ejector sleeve pin and an insert pin, and the ejector sleeve pin penetrates through and is movably connected to the rear mold; the insert pin penetrates through and is movably connected to the ejector sleeve pin; a connector is arranged at the top of the insert pin; in a die-casting state, at least part of the peripheral wall of the connector is covered by the ejector sleeve pin; in a demolding state, the ejector pin moves downwards, so that the connector is completely exposed; a spraying channel is further arranged in the rear mold, and the spraying direction of the spraying channel corresponds to the position of the connector in the exposed state; a gap is formed between a second step in an ejector sleeve pin and a second boss in an insert pin, a rear mold drives the ejector sleeve pin to synchronously move downwards to enable a connector to be in an exposed state, and a linkage type design that a spraying hole and a spraying channel are arranged to enable the connector in the exposed state to be completely covered by spraying water sprayed out of the spraying channel is adopted. And therefore, a complete isolating membrane is formed on the outer surface of the connector, and efficient and rapid demolding of a product is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of die casting, and in particular relates to a delayed core-pulling spray structure. Background Art

[0002] In the die-casting process, zinc alloys have been widely used in many industries, including electronics, automotive parts, and toy manufacturing, due to their excellent mechanical and physical properties, simple manufacturing process, high production efficiency, environmentally friendly materials, good casting performance, and the ability to undergo a variety of surface treatments.

[0003] Due to the problems of thin wall, small product and small mold space of some zinc alloy die-cast products, the products are prone to core sticking and demolding is easy to damage the products, which makes demolding difficult; therefore, in the existing demolding process, the release agent is usually sprayed in the form of a spray onto the surface of the mold core in contact with the product, so that a layer of isolation film is formed between the product and the surface of the mold core, so that the product can be more easily removed from the mold core, while ensuring the surface quality of the product and the mold core are intact; however, since part of the surface of the mold core is closed or blocked by the mold, the spray area cannot be completely covered on the surface of the mold core, so that the isolation film on the mold core does not cover the entire area, which leads to the problem of poor product demolding efficiency and effect. Summary of the invention

[0004] (1) Technical issues to be solved

[0005] The invention discloses a delayed core-pulling spray structure, aiming to solve the problem in the prior art that the spray coverage area of ​​the mold core is incomplete, resulting in poor product demoulding effect.

[0006] (2) Technical solution

[0007] The present invention discloses a delayed core-pulling spray structure, comprising a rear mold, a sleeve needle and an inserting needle, the sleeve needle passes through and is movably connected to the rear mold; the inserting needle passes through and is movably connected to the sleeve needle, and the rear mold, the sleeve needle and the inserting needle are coaxially arranged correspondingly; a connecting head is provided on the top of the inserting needle; in the die-casting state, at least part of the peripheral wall of the connecting head is covered by the sleeve needle; in the demolding state, the sleeve needle moves downward to make the connecting head completely exposed; wherein, a spray channel is also provided in the rear mold, and the spray direction of the spray channel corresponds to the position of the connecting head in the exposed state.

[0008] Furthermore, the diameter of the connecting head is smaller than the diameter of the insert needle, and when the sleeve needle is sleeved on the connecting head, a receiving cavity for receiving the product is formed between the connecting head and the sleeve needle.

[0009] Furthermore, the rear mold includes a fixed mold and a movable mold which are arranged up and down, and the bottom of the fixed mold is fixedly connected to the top of the movable mold.

[0010] Furthermore, the spray channel is arranged in the fixed mold, and a spray hole is also arranged in the fixed mold, and the spray hole is communicated with the spray channel; wherein spray water is arranged in the spray hole.

[0011] Furthermore, at least two of the spray holes and the spray channels are provided.

[0012] Furthermore, the spray water is a release agent.

[0013] Furthermore, a downwardly opening movable cavity is provided at the bottom of the movable mold, the movable cavity is connected to the through hole, a first step is provided at the top of the movable cavity, a boss corresponding to the first step is provided on the outer wall of the sleeve needle, and the boss is movably connected to the movable cavity.

[0014] Furthermore, a movable cavity 2 is provided in the boss 1, the movable cavity 2 is connected to the through hole 2, a second step is provided on the top of the movable cavity 2, a boss 2 corresponding to the second step is provided on the peripheral wall of the inlay needle, and the boss 2 is movably connected in the movable cavity 2.

[0015] Furthermore, in the die-casting state, when the sleeve needle and the connector jointly form the accommodating cavity, a gap is formed between the top of the second boss and the second step.

[0016] Furthermore, the sleeve needle is a cylindrical structure and has a guiding function for the movement of the rear mold, and the insert needle is a columnar structure and has a guiding function for the movement of the sleeve needle.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] By setting a gap between the second step in the sleeve needle and the second boss in the insert needle, the insert needle can be kept stationary while the rear mold can drive the sleeve needle to move downward synchronously so that the connector located in the sleeve needle is exposed. By setting a spray hole and a spray channel in the direction of the connector, the connector in the exposed state can be fully covered by the spray water sprayed from different spray channels through a linkage design, thereby forming a complete isolation film on the outer surface of the connector, which helps to demold the product efficiently and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is an overall exploded view of the present invention.

[0021] Figure 3 The cross-sectional view of the present invention Figure 1 .

[0022] Figure 4 For the present invention Figure 3 Enlarged view of point A in .

[0023] Figure 5 The cross-sectional view of the present invention Figure 2 .

[0024] Figure 6 The cross-sectional view of the present invention Figure 3 .

[0025] Figure 7 It is a schematic diagram of spraying toward the connecting head of the present invention.

[0026] Figure 8 It is a schematic diagram of spraying toward the product of the present invention.

[0027] Figure markings: 1-rear mold, 11-fixed mold, 111-spray hole, 112-spray channel, 113-spray water, 114-isolation membrane, 12-movable mold, 121-active cavity one, 122-first step, 13-through hole one, 2-sleeve needle, 21-through hole two, 22-boss one, 221-active cavity two, 222-second step, 3-needle, 31-connector, 32-boss two, 4-product, 41-accommodating cavity, 5-gap. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0029] In order to more clearly express the purpose of the present invention and the technical solution of the embodiment, the present invention is placed on a horizontal plane, such as Figure 1 As shown, the extending directions of the axis L are defined as up and down, respectively.

[0030] like Figure 1-8 As shown, the present invention discloses a delayed core-pulling spray structure, comprising a rear mold 1, a sleeve needle 2 and an insert needle 3, wherein the rear mold 1 is provided with a through hole 13, and the sleeve needle 2 passes through the through hole 13 up and down and is movably connected therein; the sleeve needle 2 is provided with a through hole 21, and the insert needle 3 passes through the through hole 21 up and down and is movably connected therein; the rear mold 1, the sleeve needle 2 and the insert needle 3 are coaxially arranged with the axis L as the central axis;

[0031] The top of the insert needle 3 is provided with a connector 31, and the connector 31 is sleeved with a product 4. The diameter of the connector 31 is smaller than the diameter of the insert needle 3, so that when the sleeve needle 2 is sleeved on the connector 31, a receiving cavity 41 for receiving the die-cast product 4 is formed between the connector 31 and the sleeve needle 2;

[0032] During die casting or in the die casting state, the front die (not shown) above the rear die 1 is closed with the rear die 1, and the sleeve needle 2 is sleeved on the peripheral wall of the connector 31 to form the accommodating cavity 41, and the product 4 is die-cast in the accommodating cavity 41;

[0033] During demolding or in the demolding state, the front mold moves upward to separate the top of the product 4 from the front mold. Under the premise that the insert pin 3 remains stationary, the rear mold 1 drives the sleeve needle 2 to move downward, so that the product 4 or the connector 31 is completely separated from the sleeve needle 2 and is in an exposed state.

[0034] It should be noted that the sleeve needle 2 can completely wrap the peripheral wall of the connector 31 or the product 4, or can only wrap part of the peripheral wall of the connector 31 or the product 4, that is, at least part of the peripheral wall of the connector 31 or the product 4 is covered by the sleeve needle 2, and at least part of the peripheral wall of the connector 31 and the inner wall of the sleeve needle 2 together form the accommodating cavity 41.

[0035] Specifically, the rear mold 1 includes a fixed mold 11 and a movable mold 12 arranged up and down, and the fixed mold 11 is fixedly connected to the top of the movable mold 12, so that the movement of the movable mold 12 can drive the fixed mold 11 to move synchronously;

[0036] Furthermore, if Figure 6-8 As shown, the fixed mold 11 is provided with a spray hole 111 and a spray channel 112 connected to the spray hole 111, wherein one end of the spray channel 112 away from the spray hole 111 is arranged on the top surface of the fixed mold 11, and the spray extension direction of the spray channel 112 corresponds to the position of the product 4 or the connector 31 in an exposed state;

[0037] In order to prevent the product 4 and the connector 31 from sticking to each other and causing the core to stick, after demoulding, it is necessary to spray spray water 113 on the outer surface of the connector 31 to form a layer of isolation film 114 on the outer surface of the connector 31. By providing the isolation film 114 between the product 4 and the connector 31, the product 4 and the connector 31 are effectively prevented from sticking to each other, thereby effectively improving the demoulding efficiency and demoulding effect of the product 4.

[0038] Therefore, after the product 4 is demoulded, the connector 31 remains exposed. At this time, the spray water 113 sequentially enters the spray hole 111 (relative to the main channel) and the spray channel 112 (relative to the sub-channel), and is sprayed from the other end of the spray channel 112 toward the connector 31.

[0039] Furthermore, at least two or more spray holes 111 and spray channels 112 are provided. By providing multiple spray channels 112 with different spray directions and each spray channel 112 has a spray direction toward the connector 31, the connector 31 can receive the spray water 113 from multiple directions, so that the outer surface of the connector 31 can be completely covered by the spray water 113, thereby forming a more complete isolation film 114, so as to improve the demoulding effect of the product 4;

[0040] It should be noted that, during the demoulding process, the rear mold 1 moves downward to expose the product 4. At this time, the spray water 113 or condensate can be sprayed on the outer surface of the product 4 through the spray hole 111 and the spray channel 112, so as to quickly cool down and shape the product 4, thereby facilitating the rapid shaping and demoulding of the product 4.

[0041] Preferably, the spray water 113 is a release agent.

[0042] Specifically, Figure 3-4 As shown, the bottom of the movable mold 12 is provided with an active cavity 121 opening downward, the top of the active cavity 121 is connected to the through hole 13, and the diameter of the active cavity 121 is greater than the diameter of the through hole 13 so that a first step 122 is formed on the top of the active cavity 121, and the bottom outer wall of the sleeve needle 2 is provided with an annular boss 22 corresponding to the first step 122, and the diameter of the boss 22 is between the diameter of the through hole 13 and the diameter of the active cavity 121, so that the boss 22 of the sleeve needle 2 can be movably connected in the active cavity 121;

[0043] When in use, since the diameter of the boss 122 is greater than the diameter of the through hole 13, when the rear mold 1 moves downward, the first step 122 in the active cavity 121 abuts against the top surface of the boss 122, and pushes the boss 122 and the sleeve needle 2 to move downward synchronously;

[0044] Furthermore, a second active cavity 221 is further provided in the boss 1 22, the top of the second active cavity 221 is connected to the second through hole 21, the diameter of the second active cavity 221 is larger than the diameter of the second through hole 21, so that a second step 222 is formed on the top of the second active cavity 221, and a second annular boss 32 corresponding to the second step 222 is further provided on the peripheral wall of the bottom of the inlay pin 3, and the diameter of the second boss 32 is between the diameter of the inlay pin 3 and the diameter of the second active cavity 221;

[0045] Among them, in the die-casting state, the sleeve needle 2 and the connecting head 31 jointly form the accommodating cavity 41, and a gap 5 is provided between the top of the second boss 32 and the second step 222; during the demolding process, when the rear mold 1 drives the sleeve needle 2 to move downward, the second step 222 approaches the direction of the second boss 32 and gradually reduces the upper and lower distances of the gap 5. When the second step 222 abuts against the second boss 32, the product 4 or the connecting head 31 is completely exposed, and the spraying operation is performed at this time.

[0046] Specifically, the sleeve needle 2 is a cylindrical structure, and the sleeve needle 2 is inserted into the rear mold 1, so that the rear mold 1 can move along the length direction (up and down direction) of the sleeve needle 2, so the sleeve needle 2 has a guiding effect on the movement of the rear mold 1;

[0047] Furthermore, the inserting needle 3 is a columnar structure and is slidably connected in the sleeve needle 2. When in use, the rear mold 1 and the sleeve needle 2 can move along the length direction (up and down direction) of the inserting needle 3, and the inserting needle 3 has a guiding effect on the movement of the rear mold 1 and the sleeve needle 2.

[0048] It should be noted that, under the same guiding effect, the cross-sections of the sleeve needle 2 and the insert needle 3 can be set to be circular, triangular or polygonal, etc.

[0049] The working principle of the present invention is described in detail below;

[0050] After the product 4 is demoulded, the front mold moves upward and separates from the upper surface of the product 4, and then the rear mold 1 moves downward synchronously with the sleeve needle 2 under the drive of the hydraulic mechanism (not shown). Under the premise that the insert needle 3 does not move, the rear mold 1 and the sleeve needle 2 move downward to gradually expose the connector 31. When the second step 222 in the sleeve needle 2 abuts against the second boss 32 in the insert needle 3, the connector 31 is in a completely exposed state. At this time, the spray water 113 is sprayed toward the connector 31 through the spray hole 111 and the spray channel 112 in sequence, so that the spray water 113 completely covers the outer surface of the connector 31.

[0051] At the same time, in the demolding stage, the rear mold 1 and the sleeve needle 2 move downward to make the product 4 completely exposed. At this time, the spray water 113 is sprayed toward the product 4 through the spray hole 111 and the spray channel 112 in sequence, so that the spray water 113 or the coolant completely covers the outer surface of the product 4, so that the product 4 can achieve the effect of rapid cooling and temperature setting. Finally, the product 4 is demolded by core pulling to separate the product 4 from the connector 31, thereby completing the demolding operation of the product 4.

[0052] The innovation of the present invention lies in that a gap is set between the second step in the sleeve needle and the second boss in the insert needle, so that the insert needle can remain stationary and the rear mold can drive the sleeve needle to move downward synchronously to expose the connector located in the sleeve needle. Then, by setting a spray hole and a spray channel arranged in the direction of the connector, the connector in the exposed state can be fully covered by the spray water sprayed from different spray channels through a linkage design, so that a complete isolation film is formed on the outer surface of the connector, which helps to efficiently and quickly demold the product.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A delayed core-pulling spray structure, characterized in that: It comprises a rear mold (1), a sleeve needle (2) and an insert needle (3), wherein the sleeve needle (2) penetrates through and is movably connected to the rear mold (1); the insert needle (3) penetrates through and is movably connected to the sleeve needle (2), and the rear mold (1), the sleeve needle (2) and the insert needle (3) are coaxially arranged correspondingly; and a connector (31) is provided at the top of the insert needle (3); In the die-casting state, at least part of the peripheral wall of the connecting head (31) is covered by the sleeve needle (2); In the demoulding state, the sleeve needle (2) moves downward to make the connector (31) completely exposed; Wherein, a spray channel (112) is also provided in the rear mold (1), and the spray direction of the spray channel (112) corresponds to the position of the connector (31) in the exposed state.

2. A delayed core-pulling spray structure according to claim 1, characterized in that: The diameter of the connecting head (31) is smaller than the diameter of the insert needle (3); when the sleeve needle (2) is sleeved on the connecting head (31), a receiving cavity (41) for receiving the product (4) is formed between the connecting head (31) and the sleeve needle (2).

3. A delayed core-pulling spray structure according to claim 2, characterized in that: The rear mold (1) comprises a fixed mold (11) and a movable mold (12) which are arranged one above the other, and the bottom of the fixed mold (11) is fixedly connected to the top of the movable mold (12).

4. A delayed core-pulling spray structure according to claim 3, characterized in that: The spray channel (112) is arranged in the fixed mold (11), and a spray hole (111) is also arranged in the fixed mold (11), and the spray hole (111) is connected to the spray channel (112); wherein spray water (113) is arranged in the spray hole (111).

5. A delayed core-pulling spray structure according to claim 4, characterized in that: At least two of the spray holes (111) and the spray channels (112) are provided.

6. A delayed core-pulling spray structure according to claim 5, characterized in that: The spray water (113) is a release agent.

7. The delayed core-pulling spray structure according to claim 1, characterized in that: The bottom of the movable mold (12) is provided with an active cavity (121) opening downwards, the active cavity (121) is connected to the through hole (13), the top of the active cavity (121) is provided with a first step (122), the outer wall of the sleeve needle (2) is provided with a boss (22) corresponding to the first step (122), and the boss (22) is movably connected to the active cavity (121).

8. A delayed core-pulling spray structure according to claim 7, characterized in that: A second movable cavity (221) is provided in the boss one (22), the second movable cavity (221) is communicated with the second through hole (21), a second step (222) is provided on the top of the second movable cavity (221), a second boss (32) corresponding to the second step (222) is provided on the peripheral wall of the inlay needle (3), and the second boss (32) is movably connected in the second movable cavity (221).

9. A time-delayed core-pulling spray structure according to claim 8, characterized in that: In the die-casting state, when the sleeve needle (2) and the connector (31) jointly form the accommodating cavity (41), a gap (5) is formed between the top of the second boss (32) and the second step (222).

10. The delayed core-pulling spray structure according to claim 1, characterized in that: The sleeve needle (2) is a cylindrical structure and has a guiding function for the movement of the rear mold (1); the insert needle (3) is a columnar structure and has a guiding function for the movement of the sleeve needle (2).

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