A secondary extrusion mechanism for die casting mold core

Abstract

This utility model relates to the field of secondary extrusion technology for die-casting mold cores, and in particular to a secondary extrusion mechanism for die-casting mold cores, comprising a column and a disc. The upper end of each column is fixedly connected to a disc, and a support ring is fixedly connected to the center of the outer wall of the column. An extrusion assembly is installed above two platforms, and a locking component is provided on the outer wall of the sleeve in the extrusion assembly. Through the cooperation between the self-locking cylinder, arc plate one, arc plate two, cone head, vertical rod, top plate, bottom plate, extrusion mandrel, and extrusion core, since the extrusion core is not connected to the hydraulic cylinder involved in the first extrusion during the second extrusion process, the impact force during the second extrusion will not act on the output shaft of the hydraulic cylinder of the first extrusion. This effectively avoids the problem of equipment damage caused by directly connecting hydraulic cylinders in series, which would result in the extrusion force acting directly on the output shaft of the hydraulic cylinder of the first extrusion during the second extrusion.

Description

Technical Field

[0001] This utility model relates to the field of secondary extrusion technology for die-casting mold cores, specifically a secondary extrusion mechanism for die-casting mold cores. Background Technology

[0002] Die castings are widely used in automobiles, electronics, aircraft, instruments and other fields. Because the aluminum liquid filling time is completed within tens of milliseconds, the metal liquid cools down very quickly, the shape of die castings is extremely complex, and the gas cannot be completely and orderly discharged. At the same time, the aluminum liquid solidifies rapidly. Under the action of about 800-1000 atmospheres, large pores and shrinkage cavities will also be generated in some parts of the casting, and the structure is not dense. Therefore, a secondary extrusion under high pressure is required to eliminate pores and shrinkage cavities. For example, a secondary extrusion mechanism for die casting mold core with application number "202420217940.5" belongs to the field of mold core pulling technology. It includes a hydraulic cylinder one and a hydraulic cylinder two. The hydraulic cylinder one is fixed by screws inside a hollow frame.

[0003] However, although it can reduce the cost of subsequent processes, it has problems such as the equipment being easily damaged because the extrusion force is directly applied to the output shaft of the hydraulic cylinder of the first extrusion when the hydraulic cylinders are connected in series, and the inability to adjust the conversion of extrusion power during the two extrusion processes according to the different descent distances of the extrusion cores of different models and specifications. Utility Model Content

[0004] The purpose of this invention is to solve the problems of the device, which is prone to damage when the extrusion force is directly applied to the output shaft of the hydraulic cylinder of the first extrusion during the second extrusion due to the direct connection of hydraulic cylinders in series, and the inability to adjust the conversion of extrusion power during the two extrusion processes according to the different descent distances of extrusion cores of different models and specifications. Therefore, a secondary extrusion mechanism for die-casting mold core is proposed.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] Design a secondary extrusion mechanism for die-casting mold core, including a column and a disc. The upper end of the column is fixedly connected to the disc. A support ring is fixedly connected to the center of the outer wall of the column. Platform 1 and Platform 2 are fixedly connected to the upper and lower sides of the outer wall of the column, respectively. An extrusion assembly is installed above Platform 1 and Platform 2. The outer wall of the sleeve in the extrusion assembly is provided with a locking component.

[0007] Preferably, the extrusion assembly includes a hydraulic cylinder one and a hydraulic cylinder two. The hydraulic cylinder one is fixedly connected to the upper center of the platform one. A top plate is fixedly connected to the end of the output shaft of the hydraulic cylinder one. Vertical rods are fixedly connected to both the front and rear sides of the lower end of the top plate. The hydraulic cylinder two is fixedly connected to the upper center of the platform two. Multiple sleeves are fixedly connected to the end of the output shaft of the hydraulic cylinder two and the lower part of the outer wall of the vertical rod.

[0008] Preferably, the outer wall of the vertical rod is slidably connected to the support ring.

[0009] Preferably, the engaging assembly includes a base plate and cylinders. The upper end of the base plate is fixedly connected to an arc-shaped plate at multiple points via brackets. One end of the arc-shaped plate is rotatably connected to an arc-shaped plate at a pin. A side plate is fixedly connected to the end of the arc-shaped plate at a side, and a cone head is fixedly connected to the inner wall of the arc-shaped plate at a side. A self-locking cylinder is installed at the other end of the arc-shaped plate at a side. Round rods are fixedly connected to the front and rear sides of the outer wall of the output shaft of the self-locking cylinder. The outer wall of the round rods is slidably connected to the inner wall of the side plate via a transverse sliding groove. Multiple cylinders are equidistantly fixed to the lower part of the outer wall of the vertical rod.

[0010] Preferably, a pressing mandrel is fixedly connected to the lower center of the base plate.

[0011] Preferably, the lower inner wall of the extrusion mandrel is fixedly connected to the extrusion core.

[0012] The secondary extrusion mechanism for die-casting mold core proposed in this utility model has the following advantages:

[0013] By coordinating the self-locking cylinders, arc plate one, arc plate two, cone head, vertical rod, top plate, bottom plate, extrusion mandrel, and extrusion core, the self-locking cylinders in three positions are sequentially controlled to adjust their states. This changes the state of the locking structure composed of the three arc plates one, arc plate two, and cone head, so that the cone head on both sides is in the inserted state, and the central cone head is in the unfolded state. At this time, the connection of the bottom plate is adjusted from being connected to the output shaft of hydraulic cylinder two to being connected to the output shaft of hydraulic cylinder one. Subsequently, the output shaft of hydraulic cylinder one is controlled to drive the top plate, vertical rod, and bottom plate, which in turn drive the extrusion mandrel and extrusion core to move downward, realizing the second extrusion of the aluminum liquid. Because the extrusion core is not connected to the hydraulic cylinders involved in the first extrusion during the second extrusion process, the impact force during the second extrusion will not act on the output shaft of the hydraulic cylinder of the first extrusion. In this way, the problem of equipment damage caused by directly connecting the hydraulic cylinders in series and causing the extrusion force to act directly on the output shaft of the hydraulic cylinder of the first extrusion during the second extrusion is effectively avoided.

[0014] The fit between the base plate, cylinder, cone, extrusion mandrel, and extrusion core allows for flexible operation. If a different length of extrusion core needs to be replaced (this can be done by loosening the bolts between the extrusion core and the extrusion mandrel), the height to which the base plate descends during the first extrusion will change accordingly. Since extrusion cores generally have specific specifications, and the descent distance for different specifications is fixed, the multiple cylinders in this design are arranged according to the descent distance of different extrusion core specifications. This ensures that after replacing with a different specification of extrusion core, the base plate descends to the corresponding height, and the cones on both sides can align with the insertion holes on the cylinders. This avoids the problem of not being able to adjust the extrusion power conversion during the two extrusion processes based on the different descent distances of the extrusion cores. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the left side appearance structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the external structure on the right side of this utility model;

[0017] Figure 3 This utility model Figure 1 A schematic diagram of the structure viewed from below in the image;

[0018] Figure 4 This is a schematic diagram of the structure of arc-shaped plate one and arc-shaped plate two in this utility model;

[0019] Figure 5 This utility model Figure 4 A partial sectional view of the main view in the diagram;

[0020] Figure 6 This utility model Figure 3 A schematic diagram of the structure at point I in the diagram.

[0021] In the diagram: 1. Column, 2. Disc, 3. Engaging assembly, 301. Base plate, 302. Cylinder, 303. Arc plate one, 304. Arc plate two, 305. Self-locking cylinder, 306. Side plate, 307. Bracket, 308. Cone head, 309. Round rod, 4. Extrusion assembly, 401. Hydraulic cylinder one, 402. Top plate, 403. Hydraulic cylinder two, 404. Vertical rod, 405. Sleeve, 5. Platform two, 6. Extrusion core, 7. Extrusion mandrel, 8. Support ring, 9. Platform one. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] See attached document Figure 1-6In this embodiment, a secondary extrusion mechanism for a die-casting mold core includes a column 1 and a disc 2. The upper end of the column 1 is fixedly connected to the disc 2. The center of the outer wall of the column 1 is fixedly connected to a support ring 8. The upper and lower sides of the outer wall of the column 1 are respectively fixedly connected to a platform 1 9 and a platform 2 5. An extrusion assembly 4 is installed above the platform 1 9 and the platform 2 5. The outer wall of the sleeve 405 in the extrusion assembly 4 is provided with a locking assembly 3.

[0024] See attached document Figure 1-6 In this embodiment, the extrusion assembly 4 includes a hydraulic cylinder 401 and a hydraulic cylinder 403. The hydraulic cylinder 401 is fixedly connected to the upper center of the platform 9. The output shaft of the hydraulic cylinder 401 is fixedly connected to a top plate 402. Vertical rods 404 are fixedly connected to the front and rear sides of the lower end of the top plate 402. The hydraulic cylinder 403 is fixedly connected to the upper center of the platform 5. The models of the hydraulic cylinders 401 and 403 can be determined according to specific usage requirements. Multiple sleeves 405 are fixedly connected to the output shaft of the hydraulic cylinder 403 and the lower part of the outer wall of the vertical rod 404. Insertion holes are machined on the outer walls of the three sleeves 405 and the outer wall of the cylinder 302. The outer wall of the vertical rod 404 is slidably connected to the support ring 8.

[0025] See attached document Figure 1-6 In this embodiment, the engaging assembly 3 includes a base plate 301 and a cylinder 302. The upper end of the base plate 301 is fixedly connected to the first arc-shaped plate 303 at multiple points via brackets 307. One end of the first arc-shaped plate 303 is rotatably connected to the second arc-shaped plate 304 via a pin. A side plate 306 is fixedly connected to the end of the second arc-shaped plate 304, and a conical head 308 is fixedly connected to the inner wall of the second arc-shaped plate 304. The conical head 308 corresponds to the insertion holes on the outer walls of the three sleeves 405 and the outer wall of the cylinder 302. Inserting the conical head 308 into the insertion hole is considered a connection; unfolding it is considered a separation. The first arc-shaped plate 303... A self-locking cylinder 305 is installed at the other end. The model of the self-locking cylinder 305 can be determined according to specific usage requirements. Round rods 309 are fixed to both the front and rear sides of the outer wall of the output shaft end of the self-locking cylinder 305. The outer wall of the round rod 309 is slidably connected to the transverse sliding groove of the inner wall of the side plate 306. Multiple cylinders 302 are fixedly fixed at equal intervals to the lower part of the outer wall of the vertical rod 404. An extrusion mandrel 7 is fixedly connected to the lower center of the bottom plate 301. The lower inner wall of the extrusion mandrel 7 is fixedly connected to the extrusion core 6. The extrusion core 6 and the extrusion mandrel 7 are connected by plugging and fixed by bolts.

[0026] Working principle:

[0027] When this die-casting mold core secondary extrusion mechanism is needed, the user first installs the entire device on the corresponding platform using the threaded holes on the outer side of disc 2 and external bolts. Then, the mold to be used for die casting is placed directly below the extrusion core 6, ensuring the extrusion core 6 is aligned with the die-casting mold's injection port. Molten metal (e.g., molten aluminum) is then poured into the die-casting mold's injection port. Next, hydraulic cylinder 403 is controlled, causing its output shaft to drive the base plate 301 downwards via the central sleeve 405 (at this time, the three arc-shaped plates 30...). 3. The locking structure composed of the arc plate 303 and the cone 308 is in the following states: the front and rear sides are in the unfolded state, and the central cone 308 is in the inserted state. At this time, the central cone 308 is inserted into the insertion hole of the central sleeve 405. The central sleeve 405 can then drive the base plate 301 to move downward, which in turn can drive the extrusion mandrel 7 and the extrusion core 6 to move downward, so that the extrusion core 6 is inserted into the material port of the die-casting mold. The extrusion core 6 squeezes the molten metal inside the material port of the die-casting mold into the cavity to form the corresponding shape, realizing the first extrusion of the molten metal.

[0028] After the molten aluminum completely fills the cavity, it instantly becomes a semi-solid, and pressurization begins. At this point, the user can sequentially control the three self-locking cylinders 305 to adjust their positions (the output shaft of the self-locking cylinder 305 extends, causing the round rod 309 to slide on the inner wall of the side plate 306, thereby driving the arc plate one 303 and arc plate two 303 to unfold, allowing the cone head 308 to be pulled out from the corresponding insertion hole; the output shaft of the self-locking cylinder 305 retracts, thus allowing the cone head 308 to be reinserted into the insertion hole). This changes the state of the locking structure composed of the three arc plates one 303, arc plate two 303, and cone head 308, so that the cone heads 308 on both the front and rear sides are in the inserted state (the position of the bottom plate 301 will change during the first extrusion, but since the length of the extrusion core 6 is fixed, the movement distance of the first extrusion is fixed, so that after the first extrusion is completed, both sides...). The cone 308 can stop at the corresponding position of the cylinder 302. The central cone 308 is in an unfolded state. At this time, the connection of the base plate 301 is adjusted from the connection with the output shaft of the second hydraulic cylinder 403 to the connection with the output shaft of the first hydraulic cylinder 401. Then, the output shaft of the first hydraulic cylinder 401 is controlled to drive the top plate 402, the vertical rod 404, and the base plate 301, which in turn drive the extrusion mandrel 7 and the extrusion core 6 to move downward, so as to realize the second extrusion of the aluminum liquid. Since the extrusion core 6 is not connected to the hydraulic cylinders involved in the first extrusion during the second extrusion process, the impact force during the second extrusion will not act on the output shaft of the hydraulic cylinder of the first extrusion. In this way, the problem of equipment damage caused by directly connecting the hydraulic cylinders in series and causing the extrusion force to act directly on the output shaft of the hydraulic cylinder of the first extrusion during the second extrusion is effectively avoided.

[0029] The pressure of hydraulic cylinder 401 is around 1000 atmospheres, which is the limit of the equipment pressure. The secondary extrusion cylinder has a diameter of 100 mm, and the core diameter is only 20 mm. The equipment system pressure is 160 atmospheres. Thus, by adjusting the cross-sectional area ratio of the cylinder to the core, the pressure on the core can reach 4000 atmospheres. After this extrusion, even if gas is trapped at the pressure leakage point, the die casting can be made denser and stronger through greater pressure. Hydraulic cylinder 403 only needs to push the molten aluminum into the cavity during use, so there is no need for the large pressure hydraulic cylinder used in the second extrusion. This is why secondary extrusion is used for processing.

[0030] Meanwhile, because this design incorporates multiple sets of cylindrical structures 302, when it is necessary to replace the extrusion core 6 with one of different lengths (which can be done by loosening the bolts between the extrusion core 6 and the extrusion mandrel 7), the height at which the base plate 301 descends during the first extrusion will also change accordingly. Generally, the extrusion core 6 has certain specifications, and the descent distance of different specifications of extrusion core 6 is fixed. Therefore, the multiple cylindrical structures 302 in this design are arranged according to the descent distance of different specifications of extrusion core 6, so that after replacing with other different specifications of extrusion core 6, the base plate 301 descends to the corresponding height, and the cones 308 on both sides can be aligned with the insertion holes of the cylindrical structures 302. This avoids the problem of not being able to adjust the conversion of extrusion power during the two extrusion processes according to the different descent distances of different specifications of extrusion core 6.

[0031] After die casting is completed, first control hydraulic cylinder 401 to drive the base plate 301 to move the extrusion core 6 upward. After it moves to the point where the central cone 308 is aligned with the central sleeve 405, control multiple self-locking cylinders 305 to switch states so that the locking structure composed of the three arc plates 303, arc plate 303 and cone 308 is in the unfolded state on the front and rear sides, and the central cone 308 is in the inserted state. Finally, control hydraulic cylinder 403 to move the base plate 301 and extrusion core 6 upward to reset.

[0032] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A secondary extrusion mechanism of a die core of a die-casting mold, comprising a column (1) and a disc (2), the upper end of each of the columns (1) is fixed with a disc (2), characterized in that: A support ring (8) is fixedly connected to the center of the outer wall of the column (1). Platform 1 (9) and Platform 2 (5) are fixedly connected to the upper and lower sides of the outer wall of the column (1) respectively. An extrusion assembly (4) is installed above Platform 1 (9) and Platform 2 (5). A locking assembly (3) is provided on the outer wall of the sleeve (405) in the extrusion assembly (4).

2. The secondary extrusion mechanism for die casting mold cores of claim 1, wherein: The extrusion assembly (4) includes a hydraulic cylinder one (401) and a hydraulic cylinder two (403). The hydraulic cylinder one (401) is fixedly connected to the upper center of the platform one (9). The output shaft of the hydraulic cylinder one (401) is fixedly connected to a top plate (402). The lower end of the top plate (402) is fixedly connected to both the front and rear sides of the front end. The hydraulic cylinder two (403) is fixedly connected to the upper center of the platform two (5). The output shaft of the hydraulic cylinder two (403) and the lower part of the outer wall of the vertical rod (404) are both fixedly connected to multiple sleeves (405).

3. The secondary extrusion mechanism for die casting mold cores of claim 2, wherein: The outer wall of the vertical rod (404) is slidably connected to the support ring (8).

4. The secondary extrusion mechanism for die casting mold cores of claim 1, wherein: The locking assembly (3) includes a base plate (301) and a cylinder (302). The upper end of the base plate (301) is fixedly connected to the first arc plate (303) at multiple points through brackets (307). One end of the first arc plate (303) is rotatably connected to the second arc plate (304) through a pin. The end of the second arc plate (304) is fixedly connected to a side plate (306), and a cone head (308) is fixedly connected to the inner wall of the second arc plate (304). A self-locking cylinder (305) is installed on the other end of the first arc plate (303). Round rods (309) are fixedly connected to both the front and rear sides of the outer wall of the output shaft end of the self-locking cylinder (305). The outer wall of the round rod (309) is slidably connected to the inner wall of the side plate (306) through a transverse sliding groove. Multiple cylinders (302) are equidistantly fixed below the outer wall of the vertical rod (404).

5. The die casting mold core secondary extrusion mechanism of claim 4, wherein: A compression mandrel (7) is fixedly connected to the lower center of the base plate (301).

6. The die casting mold core secondary extrusion mechanism of claim 5, wherein: The lower inner wall of the extrusion mandrel (7) is fixedly connected to the extrusion core (6).

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