A sand core quick positioning structure for a turbine shell blank

Abstract

The application relates to the positioning tool technical field, and particularly discloses a sand core rapid positioning structure for a turbine shell blank, which comprises a lower die and an upper die, the lower die and the upper die are in contact with each other, and the turbine shell sand core is placed in the lower die and the upper die; a pouring runner is arranged in the upper die; wax rods are fixedly connected to the lower die and the upper die; conical positioning heads are fixedly connected to the ends of the wax rods; conical positioning grooves are arranged on the upper and lower surfaces of the turbine shell sand core; and the conical positioning heads are clamped with the conical positioning grooves. The conical positioning heads with the wax rods are arranged in the die, corresponding conical grooves are arranged on the turbine shell sand core, the conical positioning heads are matched with the conical grooves, the turbine shell sand core is accurately positioned and automatically centered in the die cavity, and the problem of uneven casting wall thickness caused by the turbine shell sand core deviation is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of positioning tooling technology, and in particular to a sand core rapid positioning structure for turbine housing blanks. Background Technology

[0002] The turbine housing is a key component of a turbocharger, and its interior typically contains complex, irregularly shaped vortex channels. These complex internal cavities cannot be directly formed using the mold itself during the casting process; they must be formed using pre-prepared sand cores.

[0003] A search revealed a utility model patent with patent authorization announcement number CN210789115U, which discloses a sand core forming mold for an engine turbine housing. The mold comprises an upper mold, a lower mold, an ejector mechanism, and a support frame. The support frame is a hollow structure. The ejector mechanism is installed inside the support frame. The lower mold is positioned above the ejector mechanism and mounted on the support frame. The upper mold is positioned above the lower mold and aligned with it. A cavity is formed between the upper and lower molds. A core is provided within the cavity, and multiple mounting blocks are provided at the bottom of the core.

[0004] However, there is usually a certain gap between the traditional sand core and the mold to prevent difficulties in mold closing. But in actual production, this gap can easily cause the sand core to undergo small radial or circumferential displacement and rotation in the cavity, making it difficult to achieve precise centering. In addition, during the pouring process, the high temperature of the molten metal will generate a huge buoyancy impact on the sand core. Under the action of buoyancy, the sand core is prone to floating or vibrating, resulting in the casting wall thickness exceeding the tolerance or internal cavity deformation. Utility Model Content

[0005] The purpose of this invention is to provide a quick positioning structure for sand cores in turbine housing blanks, which solves the problems of inaccurate positioning and easy displacement due to external forces in existing sand cores.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a quick positioning structure for a sand core of a turbine housing blank, comprising a lower mold and an upper mold, the lower mold and the upper mold being in contact with each other, a turbine housing sand core being placed inside both the lower mold and the upper mold, a casting flow channel being provided inside the upper mold, wax rods being fixedly connected inside both the lower mold and the upper mold, a conical positioning head being fixedly connected to the end of the wax rod, conical positioning grooves being provided on both the upper and lower surfaces of the turbine housing sand core, the conical positioning head engaging with the conical positioning groove, four evenly distributed slide rails being fixedly connected to the side of the lower mold, a clamping block being slidably connected to the inner side of the slide rail, the clamping block being in contact with the side of the upper mold, and multiple pressure rods being fixedly connected to the side of the upper mold, the number and position of the pressure rods corresponding to the slide rails, the pressure rods being L-shaped, the vertical end of the pressure rod being slidably connected to the inclined surface of the clamping block.

[0007] Preferably, a positioning pin is fixedly connected to the bottom edge of the upper mold, and the positioning pin is inserted into the lower mold. The positioning pin serves to initially position the lower and upper molds.

[0008] Preferably, a ball bearing is embedded in the bottom of the clamping block, and the ball bearing is slidably connected to the inner bottom of the slide rail. The ball bearing reduces the relative friction when the clamping block slides within the slide rail.

[0009] Preferably, a guide rod is fixedly connected to the inner side of the slide rail. The guide rod passes through the clamping block and is slidably connected to the clamping block. A spring is sleeved on the outer side of the guide rod. One end of the spring is fixedly connected to the clamping block, and the other end of the spring is fixedly connected to the inner surface of the slide rail. The guide rod and spring provide auxiliary repositioning for the clamping block.

[0010] Preferably, a corrugated sleeve is fitted onto the outer side of the guide rod body. One end of the corrugated sleeve is fixedly connected to the clamping block, and the other end of the corrugated sleeve is fixedly connected to the inner surface of the slide rail. The corrugated sleeve is located on the outside of the spring and is used for dust protection of the spring.

[0011] Preferably, a locking rod is hinged to the end of the slide away from the lower mold, and a U-shaped block is fixedly connected to the outer side of the upper mold. The upper section of the locking rod is slidably connected to the groove of the U-shaped block, and a nut is threadedly connected to the upper section of the locking rod, with the bottom of the nut contacting the U-shaped block. The locking rod, nut, and U-shaped block provide a locking and anti-loosening function for the upper and lower molds.

[0012] Preferably, a pull button, made of stainless steel, is fixedly connected to the top of the locking rod. The pull button facilitates the rotation of the locking rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model achieves precise positioning and automatic alignment of the turbine housing sand core within the mold cavity by setting a conical positioning head with a wax rod inside the mold and a corresponding conical groove on the turbine housing sand core. This effectively avoids the problem of uneven casting wall thickness caused by turbine housing sand core misalignment. In addition, by setting slides, clamping blocks, springs, pressure rods, and other components on the outer sides of the upper and lower molds, the pressure rods and the inclined surfaces of the clamping blocks can synchronously drive the surrounding clamping blocks to lock towards the center during the downward pressing of the upper mold, further eliminating the potential displacement space of the turbine housing sand core.

[0014] 2. This utility model provides a second layer of protection by adding threaded locking rods and U-shaped blocks to the slide and upper mold. The mold can be locked by tightening the nut, which can effectively resist the vibration and mold lifting risks caused by the impact of molten metal and buoyancy during the pouring process, thus ensuring the safety and stability of the production process. Attached Figure Description

[0015] Figure 1 This is a perspective view of the overall structure of this utility model; Figure 2 This utility model Figure 1 A partial structural diagram; Figure 3 This utility model Figure 1 A front sectional view; Figure 4 This utility model Figure 3 Enlarged view of point A; Figure 5 This utility model Figure 3 Enlarged view of point B.

[0016] In the diagram: 1. Lower mold; 2. Upper mold; 201. Casting runner; 3. Turbine housing sand core; 4. Wax rod; 5. Conical locating head; 6. Slide rail; 7. Clamping block; 8. Ball bearing; 9. Guide rod; 10. Spring; 11. Corrugated sleeve; 12. Pressure rod; 13. Locking rod; 14. Pull button; 15. Nut; 16. U-block; 17. Locating pin. Detailed Implementation

[0017] 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 only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-5A quick positioning structure for a sand core for a turbine housing blank includes a lower mold 1 and an upper mold 2, which are in contact with each other. A positioning pin 17 is fixedly connected to the bottom edge of the upper mold 2, and the positioning pin 17 is inserted into the lower mold 1. The positioning pin 17 serves as the initial positioning element between the lower mold 1 and the upper mold 2. The turbine housing sand core 3 is placed inside both the lower mold 1 and the upper mold 2. The upper mold 2 has a casting flow channel 201 inside. Wax rods 4 are fixedly connected inside both the lower mold 1 and the upper mold 2. A conical positioning head 5 is fixedly connected to the end of the wax rod 4. Conical positioning grooves are opened on both the upper and lower surfaces of the turbine housing sand core 3. The conical positioning head 5 is engaged with the conical positioning groove. Four evenly distributed slides 6 are fixedly connected to the side of the lower mold 1. A clamping block 7 is slidably connected to the inner side of the slides 6. The clamping block 7 contacts the side of the upper mold 2. Multiple pressure rods 12 are fixedly connected to the side of the upper mold 2. The number and position of the pressure rods 12 correspond to the slides 6. The pressure rods 12 are L-shaped. The vertical end of the pressure rod 12 is slidably connected to the inclined part of the clamping block 7.

[0019] Please see Figure 5 A ball bearing 8 is embedded in the bottom of the clamping block 7, and the ball bearing 8 is slidably connected to the bottom inner side of the slide rail 6. The ball bearing 8 reduces the relative friction when the clamping block 7 slides within the slide rail 6. A guide rod 9 is fixedly connected to the inner side of the slide rail 6, passing through the clamping block 7 and slidably connected to it. A spring 10 is sleeved on the outer side of the guide rod 9, with one end fixedly connected to the clamping block 7 and the other end fixedly connected to the inner surface of the slide rail 6. The guide rod 9 and spring 10 provide auxiliary resetting for the clamping block 7. A corrugated sleeve 11 is sleeved on the outer side of the guide rod 9, with one end fixedly connected to the clamping block 7 and the other end fixedly connected to the inner surface of the slide rail 6. The corrugated sleeve 11 is located outside the spring 10 and provides dust protection for the spring 10.

[0020] Please see Figures 1-3 A locking rod 13 is hinged to the end of the slide rail 6 away from the lower mold 1. A U-shaped block 16 is fixedly connected to the outer side of the upper mold 2. The upper section of the locking rod 13 is slidably connected to the groove of the U-shaped block 16. A nut 15 is threadedly connected to the upper section of the locking rod 13, and the bottom of the nut 15 contacts the U-shaped block 16. The locking rod 13, nut 15, and U-shaped block 16 provide a locking and anti-loosening function for the upper mold 2 and the lower mold 1. A pull button 14, made of stainless steel, is fixedly connected to the top of the locking rod 13. The pull button 14 facilitates the rotation of the locking rod 13.

[0021] The specific implementation process of this utility model is as follows: In use, the prepared turbine housing sand core 3 is picked up, and its lower surface conical positioning groove is aligned with the conical positioning head 5 inside the cavity of the lower mold 1. Then, the upper mold 2 is placed on top of the lower mold 1. In the initial stage of mold closing, the positioning pin 17 at the bottom of the upper mold 2 is first inserted into the corresponding pin hole of the lower mold 1, completing the rough positioning between the upper mold 2 and the lower mold 1, ensuring the correct mold closing direction. As the upper mold 2 continues to descend, the conical positioning head 5 inside its cavity is also inserted into the conical positioning groove on the upper surface of the turbine housing sand core 3, thereby completely clamping the turbine housing sand core 3 from both top and bottom directions, achieving final precise positioning. At the same time, the vertical end of the L-shaped pressure rod 12 fixed to the side of the upper mold 2 begins to contact the inclined surface of the clamping block 7 and generates relative sliding, pushing the four clamping blocks 7 to overcome... The elastic force of spring 10 slides synchronously along slide 6 and guide rod 9 towards the center of the mold until it tightly clamps the side of upper mold 2. At this time, the mold closing action is completed, turbine housing sand core 3 is precisely positioned, and the mold is initially pressed by the clamping blocks 7 on all four sides. Finally, the operator pulls the knobs 14 on the four locking rods 13 in sequence to rotate the locking rods 13 from the horizontal position to the vertical position, and slides the vertical locking rods 13 into the groove of the U-shaped block 16 fixed on the outside of the upper mold 2, and tightens the nut 15 so that its bottom is tightly pressed against the upper surface of the U-shaped block 16. This can lock the mold and prevent the mold from being slightly lifted or vibrated due to the buoyancy of the molten metal during the pouring process. The molten metal is injected into the cavity formed by the lower mold 1, upper mold 2 and turbine housing sand core 3 through the casting channel 201.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick positioning structure for a sand core of a turbine housing blank, comprising a lower mold (1) and an upper mold (2), characterized in that: The lower mold (1) and the upper mold (2) are in contact with each other. The turbine housing sand core (3) is placed inside both the lower mold (1) and the upper mold (2). The upper mold (2) has a casting flow channel (201) inside. Wax rods (4) are fixedly connected inside both the lower mold (1) and the upper mold (2). A conical positioning head (5) is fixedly connected to the end of the wax rod (4). Conical positioning grooves are opened on both the upper and lower surfaces of the turbine housing sand core (3). The conical positioning head (5) is connected to the conical... The positioning groove is engaged. The side of the lower mold (1) is fixedly connected with four evenly distributed slides (6). The inner side of the slides (6) is slidably connected with a clamping block (7). The clamping block (7) is in contact with the side of the upper mold (2). The side of the upper mold (2) is fixedly connected with multiple pressure rods (12). The number and position of the pressure rods (12) correspond to the slides (6). The pressure rods (12) are L-shaped. The vertical end of the pressure rod (12) is slidably connected to the inclined part of the clamping block (7).

2. The quick positioning structure for sand cores of turbine housing blanks according to claim 1, characterized in that: The bottom edge of the upper mold (2) is fixedly connected with a positioning pin (17), which is inserted into the lower mold (1).

3. The quick positioning structure for sand cores of turbine housing blanks according to claim 1, characterized in that: The bottom of the clamping block (7) is embedded with a ball (8), which is slidably connected to the bottom inner side of the slide (6).

4. The quick positioning structure for sand cores of turbine housing blanks according to claim 1, characterized in that: A guide rod (9) is fixedly connected to the inner side of the slide (6). The guide rod (9) passes through the clamp (7) and is slidably connected to the clamp (7). A spring (10) is sleeved on the outer side of the guide rod (9). One end of the spring (10) is fixedly connected to the clamp (7), and the other end of the spring (10) is fixedly connected to the inner surface of the slide (6).

5. The quick positioning structure for sand cores of turbine housing blanks according to claim 4, characterized in that: The guide rod (9) has a corrugated sleeve (11) on its outer side. One end of the corrugated sleeve (11) is fixedly connected to the clamp (7), and the other end of the corrugated sleeve (11) is fixedly connected to the inner surface of the slide (6).

6. The quick positioning structure for sand cores of turbine housing blanks according to claim 1, characterized in that: The slide (6) is hinged to a locking rod (13) at one end away from the lower mold (1). A U-shaped block (16) is fixedly connected to the outside of the upper mold (2). The upper section of the locking rod (13) is slidably connected to the groove of the U-shaped block (16). A nut (15) is threadedly connected to the upper section of the locking rod (13). The bottom of the nut (15) is in contact with the U-shaped block (16).

7. The quick positioning structure for sand cores of turbine housing blanks according to claim 6, characterized in that: A pull button (14) is fixedly connected to the top of the locking rod (13), and the pull button (14) is made of stainless steel.

Images