Double-cavity die-casting die structure

Abstract

The utility model discloses a double-cavity die-casting die structure which comprises a pouring gate, a branch pouring gate is arranged at the tail end of the pouring gate, a material collecting groove is connected to the branch position of the branch pouring gate, the other end of the material collecting groove is connected with a first exhaust channel through a first overflow groove, and sub-branch channels of the branch pouring gate are respectively communicated with a forming cavity. Second overflow grooves are formed in the two sides of the end, close to the branch pouring gate, of the forming cavity, at least one second overflow groove communicates with a second exhaust channel, the forming cavity comprises a plurality of protruding part cavities, the protruding part cavity located on the lower side is connected with a third overflow groove, the protruding part cavity located on the upper side is connected with a fourth overflow groove, and the sectional area of the inlet pouring gate is sequentially reduced. A gradual pouring mode is adopted, in the filling process of molten metal, the pressure, the speed and the temperature are kept in a high-level state, casting filling is smoother, pressurization feeding flow is better transmitted, and the mechanical property of a casting is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of die casting mold technology, specifically to a dual-cavity die casting mold structure. Background Technology

[0002] Die-casting molds are tools used for casting metal parts and are widely used in the automotive, motorcycle, electronics, home appliance, and aerospace industries. In the automotive industry, they are used to produce engine blocks, cylinder heads, transmission housings, wheel hubs, and other parts. Existing technology, such as patent publication number CN205056996U, discloses a die-casting mold for a brake booster cylinder in a new energy vehicle. This mold includes an upper mold plate and a lower mold plate. An upper mold block is detachably embedded at the center of the lower surface of the upper mold plate, and a lower mold block is detachably embedded at the center of the upper surface of the lower mold plate. Both the upper and lower mold blocks have cavities. The lower mold plate also has multiple core-pulling mechanisms located on the side of the lower mold block. The upper mold plate has a feed port connected to the cavity of the lower mold block, allowing the inner cavity and various inner holes of the brake booster cylinder in the new energy vehicle to be directly die-cast. However, the near-corresponding cavity on the upper and lower mold plates, used to cast a blank, is not conducive to further improving processing efficiency. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and provide a dual-cavity die-casting mold structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A dual-cavity die-casting mold structure includes a sprue, a branch sprue at the end of the sprue, the cross-sectional area of ​​the sprue gradually decreasing, a material collection groove connected to the branch of the branch sprue, the other end of the material collection groove connected to a first venting channel through a first overflow groove, the sub-branch channels of the branch sprue respectively connecting to a molding cavity, and a second overflow groove provided on both sides of the molding cavity near the end of the branch sprue, at least one second overflow groove connecting to a second venting channel.

[0006] In some embodiments of this utility model, the molding cavity includes a plurality of protruding cavities, the protruding cavity located on the lower side is connected to a third overflow groove, and the protruding cavity located on the upper side is connected to a fourth overflow groove, the third overflow groove is arranged downward and the fourth overflow groove is arranged upward.

[0007] In some embodiments of this utility model, the second overflow channel located on the same side as the collecting trough is connected to the second exhaust channel, and the fourth overflow channel connected to the uppermost protruding cavity is connected to the third exhaust channel.

[0008] In some embodiments of this invention, the fourth overflow trough located at the lowest point is connected to a fourth exhaust duct.

[0009] In some embodiments of this utility model, the end of the molding cavity is provided with a plurality of ejector pin positions for venting.

[0010] In some embodiments of this invention, a protruding step is provided at the top of the deep cavity of the molding cavity.

[0011] In some embodiments of this utility model, the end of the material collection trough away from the branch gating channel is connected to the first overflow trough, and a middle partition is provided between the material collection trough and the first overflow trough. The height of the middle partition is less than the depth of the material collection trough, and the bottom surface of the material collection trough is higher than the bottom surface of the branch gating channel.

[0012] In some embodiments of this utility model, the sprue includes a gate, which is circular, with a cake portion at the bottom of the gate. A transition sprue is connected to the lower side of the cake portion, and the transition sprue is connected to a horizontal sprue. The horizontal sprue is connected to a branch sprue, and the cross-sectional areas of the gate, cake portion, transition sprue, horizontal sprue, and branch sprue decrease sequentially.

[0013] In some embodiments of this utility model, the branch runner and the molding cavity are located inside the mold body, and the mold body is provided with a slider groove, which is directly opposite the molding cavity and used to insert the molding slider.

[0014] In some embodiments of this utility model, an air cooling channel is provided inside the forming slider.

[0015] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following advantages:

[0016] Beneficial effects:

[0017] 1. Inside the gating system, the cross-sectional areas of the sprue section, transition gating system, horizontal gating system, and branch gating system decrease sequentially, adopting a gradual pouring method. During the filling process of the molten metal, the gradual decrease in the cross-sectional area of ​​the gating system helps to reduce the amount of gas entrainment, reduce gas entrapment and trapped gas phenomena, and maintain high levels of pressure, speed, and temperature. This results in smoother filling of the casting, better transmission of pressurized and shrinkage-compensating flow, and ensures the mechanical properties of the casting. At the same time, it works in conjunction with the various venting channels for venting, making it less prone to bubbling during subsequent high-temperature heat treatment of the casting.

[0018] 2. During the pouring of molten metal, since the molten metal material that first enters the forming cavity is a cold material with a relatively lower temperature and more oxide inclusions, a collection trough is connected at the branch of the branch gating. The collection trough helps to collect some of the cold material that has passed through the branch gating and store it through the first overflow trough, so that more molten metal material with a higher temperature and less oxide inclusions can fill the forming cavity.

[0019] 3. The second overflow trough, in conjunction with the material collection trough, helps to collect more cold material, ensuring the quality of the casting. At the same time, after pouring and cooling, slag pockets are formed in each overflow trough. Combined with the stepped section set at the top of the deep cavity of the forming cavity, this helps to reduce casting defects and ensure the forming quality.

[0020] 4. The fourth overflow tank, located on the upper side and facing upward, stores molten metal that can replenish the metal and effectively reduce the situation of insufficient filling of castings due to shrinkage of molten metal.

[0021] 5. The die-casting mold has two forming cavities, which can form two castings at the same time, which helps to improve the efficiency of forming. The forming cavities are also suitable for casting oil pumps. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the mold body of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of this utility model;

[0025] Figure 3 For the present utility model Figure 2 Enlarged view of point A;

[0026] Figure 4 This is a schematic diagram of the molding cavity of this utility model;

[0027] Figure 5 For the present utility model Figure 4 Enlarged view of point B;

[0028] Explanation of key figure labels:

[0029] 1. Inlet gate; 10. Gate; 11. Material cake section; 12. Transition runner; 13. Horizontal runner; 2. Branch runner; 20. Material collection groove; 21. First overflow groove; 22. First venting channel; 23. Middle partition section; 3. Molding cavity; 30. Second overflow groove; 31. Second venting channel; 32. Protruding cavity; 33. Third overflow groove; 34. Fourth overflow groove; 35. Third venting channel; 36. Fourth venting channel; 37. End; 38. Step section; 39. Fifth overflow groove; 4. Mold body; 40. Molding slider; 41. Air cooling channel; 42. Upper mold; 43. Lower mold. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0032] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0033] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0034] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0035] Example 1, see Figure 1-5 :

[0036] A dual-cavity die-casting mold structure includes a sprue 1, with a branch sprue 2 at its end. The cross-sectional area of ​​the sprue 1 gradually decreases. Two sub-branch channels of the branch sprue 2 each connect to a molding cavity 3, and the two sub-branch channels of the branch sprue 2 are arranged facing to both sides. The branch sprue 2 and the molding cavity 3 are located within a mold body 4. The mold body 4 is provided with a slider groove, which faces the molding cavity 3 and is used to insert a molding slider 40. It is understood that the mold body 4 includes an upper mold 42 and a corresponding lower mold 43.

[0037] The gating system 1 includes a gate 10, the bottom of which is a cake section 11. A transition gating 12 connects to the lower side of the cake section 11, which in turn connects to a horizontal gating 13. The horizontal gating 13 connects to a branch gating 2. The cross-sectional areas of the cake section 11, transition gating 12, horizontal gating 13, and branch gating 2 decrease sequentially, employing a gradual pouring method. During the filling process, the gradual decrease in the cross-sectional area of ​​the gating system reduces the amount of gas entrainment. It is understood that the horizontal gating 13 is located to the lower side of the cake section 11, and it is at the same height as the branch gating 2.

[0038] In one embodiment, the thickness of the material cake portion 11 is 15–18 mm, and the cross-sectional area of ​​the transition gating channel 12 is 9–10.2 cm². 2 The cross-sectional area of ​​the horizontal gating 13 is 7-8 cm². 2 The cross-sectional area of ​​branch gating 2 is 5.7–7 cm². 2 .

[0039] The gate 10 is circular. During the solidification process, the circular gate 10 does not solidify quickly, which can play a role in pressurizing and compensating for shrinkage, and helps to further improve the quality of the casting in the molding cavity 3.

[0040] The branch of the branch gating 2 is connected to a material collection tank 20. The other end of the material collection tank 20 is connected to the first exhaust channel 22 through the first overflow channel 21. The material collection tank 20 helps to collect the cold material passing through the branch gating 2 and store it through the first overflow channel 21, so that the hotter and less oxidized molten metal fills the molding cavity 3.

[0041] In one embodiment, the end of the material collection trough 20 away from the branch gating channel 2 is connected to the first overflow trough 21, and a middle partition 23 is provided between the material collection trough 20 and the first overflow trough 21. The height of the middle partition 23 is less than the depth of the material collection trough 20.

[0042] In one embodiment, the bottom surface of the collecting trough 20 is higher than the bottom surface of the branch gating 2. Preferably, the bottom surface of the collecting trough 20 near the middle partition 23 is higher than the bottom surface of the other end of the collecting trough 20, resulting in a stepped height difference between the bottom surfaces of the front and rear ends of the collecting trough 20.

[0043] In one embodiment, the molding cavity 3 is provided with second overflow channels 30 on both sides of one end adjacent to the branch gating 2, and at least one second overflow channel 30 is connected to a second venting channel 31. During the pouring of molten metal, since the molten metal material that first enters the molding cavity 3 is a cold material with a relatively lower temperature and more oxide inclusions, the second overflow channel 30, in conjunction with the collecting channel 20, helps to collect more cold material, allowing more molten metal material with a higher temperature and fewer oxide inclusions to fill the molding cavity, thus ensuring the quality of the casting.

[0044] In one embodiment, the forming cavity 3 includes several protruding cavities 32. The lower protruding cavity 32 is connected to a third overflow groove 33, and the upper protruding cavity 32 is connected to a fourth overflow groove 34. The third overflow groove 33 is arranged downwards, and the fourth overflow groove 34 is arranged upwards. The lower and downward-facing third overflow groove 33 helps to collect the molten metal material that enters the forming cavity 3 first during the pouring process, which is not necessarily hotter or has fewer oxide inclusions. The upper and upward-facing fourth overflow groove 34 is filled during the pouring process. The molten metal stored in the fourth overflow groove 34 can play a shrinkage compensation role, thereby effectively reducing the situation of insufficient filling of the casting due to the shrinkage of the molten metal, effectively reducing shrinkage cavities and porosity, and improving the forming quality of the casting.

[0045] In one embodiment, the second overflow trough 30 located on the same side as the material collection trough 20 is connected to the second exhaust channel 31, the fourth overflow trough 34 connected to the uppermost protruding cavity 32 is connected to the third exhaust channel 35, and the fourth overflow trough 34 located at the lowest point among the plurality of fourth overflow troughs 34 is connected to the fourth exhaust channel 36. Multiple exhaust channels help to better remove gas from the molding cavity 3, reduce the flow resistance of the molten metal, and enable it to fill the molding cavity 3 more evenly and stably.

[0046] In one embodiment, the end 37 of the molding cavity 3 is provided with a plurality of ejector pin positions for venting, which helps to improve the venting effect.

[0047] In one embodiment, the top of the deep cavity of the molding cavity 3 is provided with a protruding step portion 38, the height of which is 2-5mm. The protruding step portion 38 helps guide the flow of molten metal, allowing the molten metal to better fill various parts of the deep cavity, reducing material shortage and cold shut defects, and ensuring molding quality. Preferably, the height of the step portion 38 is 3mm.

[0048] In one embodiment, the deep cavity sidewall of the molding cavity 3 is provided with a fifth overflow groove 39.

[0049] In one embodiment, the molding cavity 3 is used for casting oil pump parts.

[0050] Example 2:

[0051] The embodiment 1 is repeated, but the molding slider 40 is provided with an air cooling channel 41, which is connected to an air compressor. The dry gas blown out by the air compressor is blown into the air cooling channel 41, thereby removing the heat from the molding slider 40 and effectively reducing the temperature of the molding slider 40.

[0052] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A twin cavity die casting mould structure characterised in that: The sprue (1) is provided with a branch sprue (2) at the end of the sprue (1), the cross-sectional area of the sprue (1) gradually decreases, the branch sprue (2) is connected with a collecting tank (20), the collecting tank (20) is connected with a first exhaust channel (22) through a first overflow tank (21), the branch sprue (2) is connected with a second overflow tank (30) on both sides of the end of the branch sprue (2), and at least one second overflow tank (30) is connected with a second exhaust channel (31).

2. A dual cavity die casting mould structure according to claim 1, characterised in that: The forming cavity (3) comprises a plurality of protruding part cavities (32), the protruding part cavity (32) located on the lower side is connected with a third overflow tank (33), and the protruding part cavity (32) located on the upper side is connected with a fourth overflow tank (34).

3. A dual cavity die casting mould structure according to claim 2, characterised in that: The second overflow tank (30) located on the same side of the collecting tank (20) is connected with the second exhaust channel (31), and the fourth overflow tank (34) connected with the uppermost protruding part cavity (32) is connected with a third exhaust channel (35).

4. A dual cavity die casting mould structure according to claim 3, wherein: The fourth overflow tank (34) located at the lowest position is connected with a fourth exhaust channel (36).

5. A dual cavity die casting mould structure as claimed in claim 1, wherein: The end (37) of the forming cavity (3) is provided with a plurality of ejector pin positions for exhaust.

6. A dual cavity die casting mould structure as claimed in claim 1, wherein: The top of the deep cavity of the forming cavity (3) is provided with a protruding step portion (38).

7. A dual cavity die casting mould structure as claimed in claim 1, wherein: A middle separation portion (23) is arranged between the collecting tank (20) and the first overflow tank (21), the height of the middle separation portion (23) is less than the tank depth of the collecting tank (20), and the bottom surface of the collecting tank (20) is higher than the bottom surface of the branch sprue (2).

8. A dual cavity die casting mould structure as claimed in claim 1, wherein: The sprue (1) comprises a gate (10), the gate (10) is circular, the bottom of the gate (10) is a cake portion (11), the cake portion (11) is connected with a transition sprue (12) below the side, the transition sprue (12) is connected with a cross sprue (13), the cross sprue (13) is connected with the branch sprue (2), and the cross-sectional areas of the gate (10), the cake portion (11), the transition sprue (12), the cross sprue (13) and the branch sprue (2) gradually decrease.

9. A dual cavity die structure according to any one of claims 1 to 8, wherein: The branch sprue (2) and the forming cavity (3) are located in a mold body (4), the mold body (4) is provided with a sliding block groove which is opposite to the forming cavity (3) and is used for inserting a forming sliding block (40).

10. A dual cavity die casting mould structure according to claim 9, characterised in that: The forming sliding block (40) is provided with an air cooling channel (41).

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