Low-pressure casting device
By designing mirrored or rotatably symmetric casting cavity in low-pressure casting devices and adopting multi-hole casting method, the problem of low production efficiency of small castings is solved and efficient casting production is achieved.
Patent Information
- Application Number
- CN202421858248.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-08-01
AI Technical Summary
The production efficiency of existing low-pressure casting devices for small castings is low and their production capacity is limited.
A low-pressure casting device is designed, and the molding chamber includes at least two sets of mirrored or rotationally symmetric casting cavity. Multi-hole casting is realized through the main runner and branch runner, and the casting liquid is filled from bottom to top and gradually cooled and solidified.
The production efficiency of small castings is improved, and the production efficiency and molding quality of castings are achieved.
Smart Images
Figure CN223171897U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting devices, and particularly relates to a low-pressure casting device for producing small castings. Background Art
[0002] Small castings, such as faucet fittings, are usually made by a low-pressure casting device with two cavities in one mold. The casting device generally includes a casting mold and a core. The moving mold, static mold of the casting mold cooperate with the core to form a casting cavity for the casting to take shape.
[0003] Since the maximum size of the small casting is usually less than 150 mm, the mass of the casting is less than 1 kg, and the surface of the casting is not subjected to grinding and electroplating treatment, the production efficiency of using a low-pressure casting device with two cavities in one mold is relatively low, and the production capacity is greatly limited. Summary of the Utility Model
[0004] Therefore, the utility model provides a low-pressure casting device capable of improving production efficiency.
[0005] In view of the above technical problems, the utility model provides the following technical solutions:
[0006] A low-pressure casting device includes a casting mold, and a forming cavity is arranged on the casting mold; the forming cavity includes: at least two groups of casting cavities and a runner for injecting pouring liquid into the casting cavities, the runner includes a main runner and branch runners communicating the main runner with the casting cavities; wherein, each group of casting cavities includes two casting cavities that are mirror-symmetrical or rotationally symmetrical along the center line of the main runner, and the horizontal plane positions of the adjacent groups of casting cavities are different.
[0007] In some embodiments of the utility model, the distances between the gates of the adjacent groups of casting cavities and the center line of the main runner are different.
[0008] In some embodiments of the utility model, in each group of casting cavities, the positions and sizes of the gates of the two casting cavities are the same along the vertical direction.
[0009] In some embodiments of the utility model, the included angle a between the cross-section direction of the main runner and the cross-section direction of the gate of the casting cavity is between 60° and 90°.
[0010] In some embodiments of the utility model, the diameter of the cross-section of the main runner is between 20 mm and 32 mm, and the thickness of the gate of the casting cavity is between 3 mm and 8 mm.
[0011] In some embodiments of the present utility model, the molding chamber includes two sets of casting cavities. The distance L1 between the set of casting cavities located on the lower side and the center line of the main runner is greater than the distance L2 between the set of casting cavities located on the upper side and the center line of the main runner.
[0012] In some embodiments of the present utility model, the molding chamber further includes an exhaust riser. The exhaust riser is located on the first side of the casting cavity, and the first side is opposite to the side of the casting cavity where the gate is arranged.
[0013] In some embodiments of the present utility model, the exhaust riser is located at a position close to the upper side of the casting cavity.
[0014] In some embodiments of the present utility model, each casting cavity is provided with at least two gates, and the gates are respectively located on the same side of the casting cavity.
[0015] In some embodiments of the present utility model, it further includes a core, and the molding chamber is formed between the casting mold and the core.
[0016] The technical solution of the present utility model has the following technical effects compared with the prior art:
[0017] In the low-pressure casting device provided by the present utility model, the molding chamber of the casting device includes at least two sets of casting cavities. The multiple sets of casting cavities are arranged up and down, and each set of casting cavities is arranged in mirror symmetry or rotational symmetry with each other. When casting and molding, the casting liquid fills from bottom to top through the runner, and enters the multiple sets of casting cavities through the main runner and the branch runners respectively. As the casting liquid fills in sequence, it gradually cools and solidifies, and after solidification, it forms a casting, realizing multi-cavity casting of the casting, and improving the production efficiency of the casting. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The following will describe in detail the preferred embodiments of the present utility model through the drawings, which will help to understand the purpose and advantages of the present utility model, wherein:
[0019] Figure 1 is a schematic structural diagram of a specific embodiment of the low-pressure casting device provided by the present utility model;
[0020] Figure 2 is a schematic structural diagram of a specific embodiment of the molding chamber in the low-pressure casting device provided by the present utility model;
[0021] Figure 3 is a schematic structural diagram of a casting formed by casting with the low-pressure casting device of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative work belong to the scope of protection of the present utility model.
[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0024] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0025] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0026] As Figure 1 shown is a specific embodiment of the low-pressure casting device provided by the present utility model. This low-pressure casting device is specifically a casting device with a mold diameter not greater than 500 mm, and is used for forming small castings with low surface quality requirements and without the need for grinding and electroplating treatment. In this embodiment, taking the casting of faucet fittings as an example, the weight of the casting is between 0.5 kg and 1 kg, and the maximum size of the casting is less than 150 mm.
[0027] The low-pressure casting device includes a casting mold 10 and a core 30. Among them, the casting mold 10 includes a movable mold 10a and a stationary mold 10b. The movable mold 10a, the stationary mold 10b of the casting mold 10 and the core 30 cooperate to form a molding cavity 20. The molding cavity 20 includes at least two groups of casting cavities 21 and a runner 22 for injecting pouring liquid into the casting cavities 21. The runner 22 includes a main runner 221 and a branch runner 222 connecting the main runner 221 and the casting cavities 21. Among them, each group of casting cavities 21 includes two casting cavities 21 that are mirror-symmetrical or rotationally symmetrical along the center line of the main runner 221. The horizontal positions of the adjacent groups of casting cavities 21 are different, that is, the adjacent groups of casting cavities 21 are arranged vertically, and their distances from the bottom surface of the casting mold 10 are different.
[0028] Figure 1 The specific structure of a four-cavity casting device with the above structure is shown. The molding cavity 20 of the casting device includes two groups of casting cavities 21, namely the first group of casting cavities 21-1 located on the lower side and the second group of casting cavities 21-2 located on the upper side. The casting cavities ③ and ④ in the first group of casting cavities 21-1 ， The casting cavities ① and ② in the second group of casting cavities 21-2 are respectively arranged in mirror symmetry. During casting and molding, the pouring liquid fills the mold from bottom to top through the runner 22, and enters the first group of casting cavities 21 and the second group of casting cavities 21 respectively through the main runner 221 and the branch runner 222 until the four casting cavities 21 are filled. The pouring liquid gradually cools and solidifies along with the filling sequence, and forms castings after solidification. Through the vertical staggered arrangement of the above casting cavities 21, multi-cavity casting of castings can be realized, improving production efficiency.
[0029] In other alternative embodiments, according to the size requirements of the castings, the casting cavities 21 in the casting mold 10 can also be set to six, eight or more. In addition, in each group of casting cavities 21 of the casting mold 10, the two casting cavities 21 can also be arranged in rotational symmetry.
[0030] Specifically, in an optional embodiment, the distances between the gates 24 of the adjacent groups of casting cavities 21 and the center line h of the main runner 221 are different. As Figure 1 shown, the distance L1 between the gate 24 of the first group of casting cavities 21 located on the lower side and the center line of the main runner 221 is greater than the distance L2 between the gate 24 of the second casting cavity 21 located on the upper side and the center line of the main runner 221. This setting method makes the time used for the pouring liquid from the bottom inlet of the runner 22 to each casting cavity 21 basically the same as much as possible, so as to improve the molding quality and consistency of the castings.
[0031] Specifically, in order to ensure the pouring consistency of the two casting cavities 21 in each group of casting cavities 21, the positions and sizes of the gates 24 of the two casting cavities 21 in the vertical direction are the same. As Figure 1 shown, each of the casting cavities 21 is provided with a gate 24, which extends in the vertical direction, and the sizes of the gates 24 of each casting cavity 21 are equal. In other alternative embodiments, when the casting has a large dimension in one direction and a small dimension in another direction, the casting cavity 21 is usually provided with a gate 24 in the area matching the side with the larger dimension of the casting, and each of the casting cavities 21 is provided with at least two gates 24, and the gates 24 are respectively located on the same side surface of the casting cavity 21, which can realize the rapid filling of the casting cavity 21 and avoid the slow filling speed of the casting caused by only setting one gate 24 and the insufficient gas exhaust resulting in pore defects.
[0032] More specifically, in an alternative embodiment, the diameter of the cross-sectional area of the main runner 221 is between 20 mm and 32 mm, and the thickness of the gate 24 of the casting cavity 21 is between 3 mm and 8 mm. By using the main runner 221 and the gate 24 within the above-mentioned size ranges, the pouring uniformity of each area of the casting cavity 21 can be better and the filling speed can meet the production requirements.
[0033] Specifically, as Figure 1 shown, the included angle α between the cross-sectional direction of the main runner 221 and the cross-sectional direction of the gate 24 of the casting cavity 21 is between 60° and 90°. By adopting the above-mentioned angle range according to the shape of the casting, it is convenient for the filling and gas exhaust of the casting cavity 21.
[0034] Among them, as Figure 3 shown, in this embodiment, the formed faucet fitting casting as a whole is a T-shaped pipe body, which includes a first pipe body A1 extending in the first direction and a second pipe body A2 extending perpendicular to the first direction. The second pipe body A2 communicates with the middle area of the first pipe body A1, and the length of the first pipe body A1 is much greater than the length of the second pipe body A2. In this embodiment, the casting cavity 21 includes a first part extending in the vertical direction and a second part extending in the horizontal direction. The first part is used to form the first pipe body A1 of the casting, and the second part is used to form the second pipe body A2 of the casting. The cross-sectional direction of the main runner 221 of the casting device is the horizontal direction, and the cross-sectional direction of the gate 24 of the casting cavity 21 is close to the vertical direction, which can make the pouring liquid enter the first part of the casting cavity 21 along the nearly horizontal direction and fill the second part along the horizontal direction until it is full. Since the length of the second part is short, by arranging the cross-section of the main runner 221 perpendicular to the cross-section of the gate 24 of the casting cavity 21, the filling speed can be relatively fast and the filling quality can be good.
[0035] Specifically, as Figure 2 shown, the molding chamber 20 further includes an exhaust riser 23, and the exhaust riser 23 is located on the first side of each casting cavity 21. Among them, the first side of the casting cavity 21 is disposed opposite to the side of the casting cavity 21 where the gate 24 is provided. More specifically, the exhaust riser 23 is located at a position close to the upper side of the casting cavity 21, that is, the exhaust riser 23 is located at a position close to the corner of the casting cavity 21, which can make the cross-section of the last filling position of the casting cavity 21 very small. By providing a smaller exhaust riser 23, the exhaust of the casting cavity 21 can be realized, and the porosity defect can be avoided.
[0036] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.
Claims
1. A low-pressure casting device, comprising a casting mold (10), wherein a molding cavity (20) is arranged on the casting mold (10); characterized in that, The forming chamber (20) includes: Two groups of casting cavities (21) and a runner (22) for injecting casting liquid into the casting cavities (21). The runner (22) includes a main runner (221) and a branch runner (222) connecting the main runner (221) and the casting cavities (21); Among them, each group of casting cavities (21) includes two casting cavities (21) arranged symmetrically with respect to the center line of the main runner (221). The horizontal positions of the adjacent groups of casting cavities (21) are different; the distance L1 between the group of casting cavities (21) on the lower side and the center line of the main runner (221) is greater than the distance L2 between the group of casting cavities (21) on the upper side and the center line of the main runner (221); the included angle a between the flow cross-section direction of the main runner (221) and the flow cross-section direction of the gate (24) of the casting cavity (21) is between 60° and 90°.
2. The low-pressure casting device according to claim 1, characterized in that, In each group of casting cavities (21), the positions and sizes of the gates (24) of the two casting cavities (21) are the same in the vertical direction.
3. A low-pressure casting device according to claim 1, characterized in that The diameter of the flow cross-section of the main runner (221) is between 20 mm and 32 mm, and the thickness of the gate (24) of the casting cavity (21) is between 3 mm and 8 mm.
4. A low-pressure casting device according to claim 1, characterized in that, The forming chamber (20) further includes an exhaust riser (23). The exhaust riser (23) is located on the first side of the casting cavity (21), and the first side is opposite to the side of the casting cavity (21) where the gate (24) is provided.
5. A low-pressure casting device according to claim 4, characterized in that The exhaust riser (23) is located at a position close to the upper side of the casting cavity (21).
6. A low-pressure casting device according to claim 1, characterized in that, Each casting cavity (21) is provided with at least two gates (24), and the gates (24) are respectively located on the same side of the casting cavity (21).
7. A low-pressure casting device according to claim 1, characterized in that, It further includes a core (30). The forming chamber (20) is formed between the casting mold (10) and the core (30).