Die for casting process

Abstract

The utility model relates to a mould for casting process, which comprises a fixed mould and a movable mould, the fixed mould and the movable mould can be combined oppositely to form a casting cavity to form a workpiece to be processed, and the fixed mould and / or the movable mould are / is provided with at least two runners for feeding and a feeding cylinder communicated with a feeding port of the runner. A flow channel is arranged on the side portion of the feeding cylinder, an accelerating channel used for accelerating the flowing speed of fluid is arranged at the far end, located on the downstream portion, of the flow channel in the flowing direction of the fluid, and the extending direction of the accelerating channel intersects with the extending direction of the flow channel. The utility model has the advantages that the acceleration channel crossed with the extending direction of the flow channel is arranged at the far end of the downstream of the flow channel so as to accelerate the flowing speed of fluid, so that the friction in the fluid is intensified to increase the temperature, and the low temperature of metal liquid caused by the overlong flow channel can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a mold structure which is convenient for casting processing. Background Art

[0002] Casting is a common hot metal working process. A casting cavity is formed by a movable and fixed mold. Liquid metal is then injected through a feed channel and cooled to form the workpiece. Cooling channels are often required during the casting process to lower the temperature of the liquid metal, improving the quality of the workpiece while also reducing cooling time and increasing production efficiency.

[0003] Common casting molds include those disclosed in the Chinese utility model patent "A Die-Casting Mold with an Extended Feed Cylinder," patent number CN201822239327.0 (publication number CN209886635U). This mold features a feed cylinder on the upper die core, through which liquid metal is injected into the feed port. Cooling channels are also located inside the upper and lower die cores to reduce mold temperature.

[0004] However, the above casting mold still has the following limitations in actual use: First, when the feed flow channel is Figure 1 As shown, the feed port 1' is connected to three shorter first flow channels 11' and two longer second flow channels 12'. The second flow channels 12' extend toward the side of the workpiece 2' to be processed and therefore have a certain length. This causes the temperature of the molten metal passing through the second flow channels 12' to be relatively low. Even if no cooling flow channels are provided at the corresponding positions of the second flow channels 12', the temperature of the molten metal will still be relatively low, which in turn leads to problems such as poor quality of the workpiece to be processed, blockage of the discharge port, and obstruction of the molding process. Secondly, during the die-casting process, it is also necessary to detect the temperature changes of the workpiece to be processed in the casting cavity during the molding process. For this purpose, tools such as electronic thermometers and surface contact thermometers are usually used to detect the temperature from the outside of the mold. However, when the local thickness of the workpiece to be processed is large, such as when the local thickness exceeds 30mm, the temperature data detected from the outside of the mold may be inaccurate and the feedback may not be timely. Therefore, there is still a need to further improve the existing mold. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a mold capable of avoiding the low temperature of the metal liquid caused by an overly long flow channel in response to the above-mentioned existing technical status.

[0006] The second technical problem to be solved by the present invention is to provide a mold which can accurately detect temperature changes even if the workpiece to be processed has a large thickness, in response to the above-mentioned existing technical status.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows: the mold used in the casting process includes a fixed mold and a movable mold, the fixed mold and the movable mold are relatively combined to form a casting cavity for molding the workpiece to be processed, and the fixed mold and / or the movable mold are provided with a flow channel for feeding and a feeding cylinder connected to the feed port of the flow channel, characterized in that:

[0008] There are at least two flow channels, at least one of which is located on the side of the feed barrel. Along the flow direction of the fluid, the flow channel is provided with an acceleration channel at the far end downstream for accelerating the flow speed of the fluid, and the extension direction of the acceleration channel intersects with the extension direction of the flow channel.

[0009] In order to enable the fluid to flow into and out of the acceleration channel, preferably, the acceleration channel is provided with an acceleration section, a first wall section, and a second wall section. When the fluid in the flow channel is discharged from the acceleration channel in a state accelerated by the acceleration section, the first wall section causes the fluid to flow in the forward direction, while the second wall section causes the fluid to be discharged back into the flow channel in the reverse direction. Since the extension direction of the acceleration channel intersects with the extension direction of the flow channel, that is, the first wall section intersects with the extension direction of the flow channel, similar to a tributary branched off from the main stream of a river, when the fluid flows along the flow channel, part of the fluid can flow into the acceleration section in the forward direction along the first wall section; and the role of the second wall section is similar to the bank of the tributary to guide the flow of the fluid; in addition, it should be noted that the "reverse direction" is not completely opposite to the direction of the fluid in the flow channel, but rather an intersecting relationship.

[0010] To increase the fluid flow rate within the acceleration section, the first cross-section of the acceleration section is preferably smaller than the second cross-section of the flow channel to increase the fluid flow rate. This reduction in cross-sectional area increases the fluid flow rate, reduces pressure, and increases friction within the fluid, generating heat and raising the fluid temperature.

[0011] In order to enable the first wall portion to allow the fluid to flow in the forward direction, preferably, the flow channel located on the side of the feed barrel is curved, the acceleration section is connected to the last inflection point of the flow channel toward the downstream far end, the first wall portion is inclined toward the flow channel along the forward direction of the fluid, and forms a first angle with the tangent at the corresponding inflection point of the flow channel, thereby connecting with the flow channel to allow the fluid to flow toward the second wall portion. The flow channel is curved because the flow channel is set on the side of the feed barrel, and it is precisely because of the curved shape that the flow speed of the fluid is slow and the temperature is reduced, and the inflection point of the flow channel is usually the location where the flow speed of the fluid slows down. Therefore, the acceleration section is set at the last inflection point at the downstream far end of the flow channel, so that the fluid in the flow channel can flow directly to the casting cavity after being accelerated and heated through the acceleration channel.

[0012] In order to enable the second wall portion to direct the fluid in the reverse direction, the wall surface of the second wall portion is preferably a circular curved surface and is tangent to the first wall portion, so as to direct the fluid flowing in the forward direction along the first wall portion in the reverse direction. The wall surface of the second wall portion is a circular curved surface, so that the fluid flowing toward the second wall portion can flow along the circular curved surface and be turned in the reverse direction.

[0013] To enable fluid to be discharged from the acceleration channel back into the flow channel, the acceleration channel preferably further includes a third wall portion connected downstream of the second wall portion. The third wall portion and the first wall portion oppose each other to form the acceleration section. The third wall portion is inclined toward the flow channel in the opposite direction of the fluid flow and forms a second angle with the tangent line at the corresponding inflection point of the flow channel to facilitate fluid discharge. The third wall portion and the first wall portion oppose each other, and the channel formed therebetween is the acceleration section. The second angle is provided to facilitate the smooth discharge of the accelerated fluid in the opposite direction to the flow channel.

[0014] In order to improve the effects of the first wall portion and the second wall portion, preferably, the first angle is in the range of 45° to 60°, and correspondingly, the second angle is in the range of 75° to 90°. The idea of ​​setting the first angle is to make the fluid flow as smoothly as possible from the flow channel to the acceleration channel. If the first angle is too large, it will make it difficult for the fluid to enter the acceleration channel from the flow channel, but if the first angle is too small, it will cause excessive loss of the fluid turning at the second wall portion; the idea of ​​setting the second angle is to tilt the reverse direction fluid to the forward direction as smoothly as possible and return it to the flow channel, thereby reducing the impact on the fluid in the flow channel, and the second angle is a follower relationship with respect to the first angle, specifically, if the first angle increases, the second angle needs to be reduced accordingly.

[0015] To achieve a smaller first cross-section than the second cross-section, the heights of the first and third walls are preferably smaller than the height of the flow channel, thereby making the first cross-section smaller than the second cross-section. In fact, the height can also be understood as the "thickness" of the flow channel. Therefore, while the width remains unchanged, the thickness is reduced, making the first cross-section smaller than the second. Reducing the thickness rather than the width reduces the cross-sectional area to allow for a wider space for fluid to flow in. Finally, the thickness is preferably less than 2 mm.

[0016] To facilitate the flow of fluid into the acceleration channel, the flow channel is preferably C-shaped, with the acceleration channel located on the convex side of the flow channel. The C-shaped flow channel is simple and relatively less obstructive to the fluid. However, due to inertia, the fluid in the flow channel tends to flow toward the convex side. Therefore, placing the acceleration channel on the convex side facilitates the flow of fluid into the acceleration channel.

[0017] To address the second technical issue, preferably, the workpiece to be processed has at least a partially defined thickness region, and a temperature sensor is installed near the thickness region on the fixed and / or movable molds. Placing the sensor inside the fixed and / or movable molds provides more accurate and timely temperature feedback compared to external temperature monitoring, and is suitable for processing workpieces with defined thickness regions of 30 mm or greater.

[0018] Compared with the prior art, the advantages of the present invention are that an acceleration channel is provided at the far end of the flow channel in the downstream, which intersects with the extension direction of the flow channel to accelerate the flow rate of the fluid, thereby increasing the friction inside the fluid and raising the temperature, thereby avoiding the low temperature of the metal liquid caused by the flow channel being too long. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a workpiece to be processed, a feed port, a first flow channel, and a second flow channel in the background technology of the present utility model;

[0020] Figure 2 This is a schematic structural diagram of the mold in the embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the exploded structure of the mold in the embodiment of the present utility model;

[0022] Figure 4 This is a schematic structural diagram of a workpiece to be processed, a flow channel, and an acceleration channel in an embodiment of the present utility model;

[0023] Figure 5 This is a structural diagram of the flow channel and the acceleration channel from another angle in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the flow state of the fluid in the flow channel and the acceleration channel in an embodiment of the present utility model;

[0025] Figure 7 This is a schematic structural diagram of the first cross section and the second cross section in an embodiment of the present utility model;

[0026] Figure 8 It is a schematic diagram of the cross-sectional structure of the mold in the embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below with reference to specific embodiments.

[0028] like Figures 2 to 8 Shown is a preferred embodiment of the present utility model. Figures 2-3As shown, the mold used for the casting process includes a fixed mold 11 and a movable mold 12. The fixed mold 11 and the movable mold 12 are combined to form a casting cavity C for forming the workpiece A to be processed. The fixed mold 11 is provided with a flow channel 2 for feeding and a feed barrel 22 connected to the feed port 21 of the flow channel 2. There are at least two flow channels 2, at least one of which is located on the side of the feed barrel 22. Along the flow direction of the fluid, the flow channel 2 is provided with an acceleration channel 3 at the downstream distal end for accelerating the flow speed of the fluid. The extension direction of the acceleration channel 3 intersects with the extension direction of the flow channel 2. The mold in this embodiment has five flow channels 2, two of which are located on the side of the feed barrel 22. In addition, in reality, the flow channels 2 should be opened on the mold. In order to more intuitively represent the structure of the flow channels 2, the flow channels 2 are shown in the form of entities.

[0029] Since the fluid needs to flow into the acceleration channel 3 for acceleration, Figures 4-5 As shown, the acceleration channel 3 is provided with an acceleration section 31, a first wall section 32, and a second wall section 33. When the fluid in the flow channel 2 is discharged from the acceleration channel 3 in a state accelerated by the acceleration section 31, the first wall section 32 allows the fluid to flow in the forward direction, while the second wall section 33 allows the fluid to be discharged in the reverse direction back to the flow channel 2. Since the extension direction of the acceleration channel 3 intersects the extension direction of the flow channel 2, that is, the first wall section 32 intersects the extension direction of the flow channel 2, when the fluid flows along the flow channel 2, part of the fluid can flow into the acceleration section 31 in the forward direction along the first wall section 32. Figure 7 , the first cross-section N1 of the acceleration section 31 is smaller than the second cross-section N2 of the flow channel 2 to accelerate the flow rate of the fluid. This is because the reduction in cross-sectional area will cause the flow rate of the fluid to increase, the pressure to decrease, the friction inside the fluid to increase, and the heat generated to increase the temperature of the fluid. Furthermore, it can be seen that the flow channel 2 located on the side of the feed barrel 22 presents a curved C-shaped structure, and the acceleration channel 3 is located at the last inflection point of the convex side of the flow channel 2 toward the downstream far end, and the first wall portion 32 is inclined toward the flow channel 2 along the direction of the fluid, and forms a first angle α with the tangent at the corresponding inflection point of the flow channel 2, thereby connecting with the flow channel 2 to allow the fluid to flow to the second wall portion 33. The flow channel 2 is curved because the flow channel 2 is arranged on the side of the feed barrel 22, and it is precisely because of the curved shape that the flow speed of the fluid is likely to be slow and the temperature is reduced. The inflection point of the bend of the flow channel 2 is usually the position where the flow speed of the fluid slows down. Therefore, the acceleration section 31 is set at the last inflection point at the far downstream end of the flow channel 2, so that the fluid in the flow channel 2 can flow directly to the casting cavity C after being accelerated and heated through the acceleration channel 3.

[0030] More specifically, regarding the specific structure of the acceleration channel 3, the following details need to be noted. First, the wall surface of the second wall portion 33 is a circular curved surface and is tangent to the first wall portion 32, so as to guide the fluid flowing in the forward direction along the first wall portion 32 to flow along the circular curved surface in the reverse direction. Secondly, the acceleration channel 3 also includes a third wall portion 34 connected to the downstream of the second wall portion 33. The third wall portion 34 and the first wall portion 32 are opposite to each other to form an acceleration section 31. The third wall portion 34 is inclined toward the flow channel 2 in the reverse direction of the fluid, and has a second angle β between the tangents at the corresponding inflection points of the flow channel 2 for fluid discharge. The third wall portion 34 and the first wall portion 32 are opposite to each other, and the channel formed therebetween is the acceleration section 31, and the second angle β is provided to facilitate the accelerated fluid to be discharged smoothly in the reverse direction to the flow channel 2. As Figure 7 As shown, the height of the first wall portion 32 and the third wall portion 34 is smaller than the height of the flow channel 2, so that the first cross-section N1 is smaller than the second cross-section N2. The height can be understood as the "thickness" of the flow channel 2. Therefore, when the width remains unchanged, the thickness is reduced, so that the first cross-section N1 is smaller than the second cross-section N2. The cross-sectional area is reduced by reducing the thickness instead of reducing the width in order to provide a wider space for the fluid to flow in. In this embodiment, the thickness of the acceleration section 31 is 2 mm. Finally, as shown in FIG. Figure 6 As shown, the first angle α is 45°, and the corresponding second angle β is 90°. The first angle α is set so that the fluid flows as smoothly as possible from the flow channel 2 to the acceleration channel 3. If the first angle α is too large, it will make it difficult for the fluid to enter the acceleration channel 3 from the flow channel 2. However, if the first angle α is too small, it will cause excessive loss of the fluid turning at the second wall portion 33. The second angle β is set so that the reverse flow is tilted as smoothly as possible and returned to the flow channel 2 in the forward direction, so as to reduce the impact on the fluid in the flow channel 2. The second angle β is in a driven relationship with the first angle α. Specifically, if the first angle α increases, the second angle β needs to be reduced accordingly.

[0031] In addition, if Figure 8 As shown, the workpiece A to be processed has at least a partially defined thickness region B having a defined thickness L. A temperature sensor 4 is provided on the movable mold 12 near the defined thickness region B. In this embodiment, the defined thickness L is 30 mm. Positioning the sensor 4 inside the fixed mold 11 and / or movable mold 12 provides more accurate and timely temperature feedback compared to external temperature detection. Therefore, it is more suitable for processing workpieces A whose thickness exceeds the defined thickness L.

Claims

1. A mold for a casting process, comprising a fixed mold (11) and a movable mold (12), wherein the fixed mold (11) and the movable mold (12) are combined to form a casting cavity (C) for molding a workpiece (A) to be processed, and the fixed mold (11) and / or the movable mold (12) are provided with a flow channel (2) for feeding and a feeding cylinder (22) connected to a feeding port (21) of the flow channel (2), characterized in that: There are at least two flow channels (2), at least one of which is located on the side of the feed barrel (22). Along the flow direction of the fluid, the flow channel (2) is provided with an acceleration channel (3) at the far end downstream for accelerating the flow speed of the fluid, and the extension direction of the acceleration channel (3) intersects with the extension direction of the flow channel (2).

2. The mold according to claim 1, characterized in that: The acceleration channel (3) is provided with an acceleration section (31), a first wall portion (32) and a second wall portion (33). When the fluid in the flow channel (2) is discharged from the interior of the acceleration channel (3) in a state accelerated by the acceleration section (31), the first wall portion (32) causes the fluid to flow in a forward direction, while the second wall portion (33) causes the fluid to be discharged back to the flow channel (2) in a reverse direction.

3. The mold according to claim 2, characterized in that: The first cross section (N1) of the acceleration section (31) is smaller than the second cross section (N2) of the flow channel (2) so as to increase the flow speed of the fluid.

4. The mold according to claim 3, characterized in that: The flow channel (2) located on the side of the feed barrel (22) is curved in shape, the acceleration section (31) is connected to the last inflection point of the flow channel (2) toward the downstream far end, the first wall portion (32) is inclined toward the flow channel (2) along the direction of the fluid, and forms a first angle (α) with the tangent at the corresponding inflection point of the flow channel (2), thereby connecting with the flow channel (2) to allow the fluid to flow toward the second wall portion (33).

5. The mold according to claim 4, characterized in that: The wall surface of the second wall portion (33) is a circular curved surface and is tangent to the first wall portion (32) so as to guide the fluid flowing in the forward direction along the first wall portion (32) to the reverse direction.

6. The mold according to claim 5, characterized in that: The acceleration channel (3) further comprises a third wall portion (34) connected to the downstream of the second wall portion (33); the third wall portion (34) and the first wall portion (32) are opposite to each other to form the acceleration section (31); the third wall portion (34) is inclined toward the flow channel (2) in the opposite direction of the fluid, and has a second angle (β) between the third wall portion (34) and the tangent line at the corresponding inflection point of the flow channel (2) to allow fluid to be discharged.

7. The mold according to claim 6, characterized in that: The first angle (α) ranges from 45° to 60°, and correspondingly, the second angle (β) ranges from 75° to 90°.

8. The mold according to claim 6, characterized in that: The heights of the first wall portion (32) and the third wall portion (34) are smaller than the height of the flow channel (2), thereby making the first cross section (N1) smaller than the second cross section (N2).

9. The mold according to any one of claims 4 to 8, characterized in that: The flow channel (2) has a C-shaped structure, and the acceleration channel (3) is located on the convex side of the flow channel (2).

10. The mold according to any one of claims 1 to 8, characterized in that: A workpiece (A) to be processed is at least partially a thickness region (B) having a limited thickness (L), and a sensor (4) for detecting temperature is provided on the fixed die (11) and / or the movable die (12) at a position close to the thickness region (B).

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