A supercharger turbine housing assembly sand core casting system and its core shooting method

Abstract

This invention discloses a turbocharger turbine housing combined sand core casting system and its core shooting method, which has reasonable process, convenient operation and high production efficiency. The system includes a chassis sand core and a gating and riser sand core. The chassis sand core has an inner cavity. The outer side of the inner cavity of the chassis sand core is provided with a lower shell mold sand core and an upper shell mold sand core. The center of the inner cavity of the chassis sand core is provided with a runner sand core and an inner hole sand core. The gating and riser sand core is supported by the upper shell mold sand core and the inner hole sand core. The upper shell mold sand core, the lower shell mold sand core, and the gating and riser sand core are provided with sprues. The gating and riser sand core is provided with a top riser. The upper shell mold sand core is provided with a side riser. The top surface of the lower shell mold sand core is provided with a lower horizontal runner. The two ends of the lower horizontal runner are provided with filter screen grooves and filters are installed. The bottom surface of the upper shell mold sand core is provided with an ingate and an upper horizontal runner. The upper horizontal runner is divided into two sections. The two sections of the upper horizontal runner are connected to the filter screens at both ends of the lower horizontal runner. One side of the middle section of the lower horizontal runner is connected to the sprue.

Description

Technical Field

[0001] This invention relates to the field of sand core casting technology, and in particular to a turbocharger turbine housing combined sand core casting system and its core shooting method. Background Technology

[0002] In the casting process, sand core casting refers to the process of creating the outer and inner structural shapes of a part using other easily moldable materials. The sand core is then assembled according to the process, forming a cavity in the sand core that matches the dimensions of the part. A fluid liquid is then poured into this cavity, and after the liquid cools and solidifies, a part with the exact same shape as the mold is formed. Traditional sand core casting uses wooden molds and manual resin sand molding, which not only requires high skill from workers but also results in unstable molding (core) quality, low production efficiency, short lifespan of wooden molds, and high maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a turbocharger turbine housing combined sand core casting system and its core shooting method, which has reasonable process, convenient operation and high production efficiency.

[0004] The objective of this invention is achieved as follows:

[0005] A turbocharger turbine housing composite sand core casting system,

[0006] The casting includes a chassis sand core (1) and a gating and riser sand core (17). The chassis sand core (1) has an inner cavity. The outer side of the inner cavity of the chassis sand core (1) is provided with a lower housing mold sand core (2) and an upper housing mold sand core (14). The lower housing mold sand core (2) and the upper housing mold sand core (14) are interlocked. The center of the inner cavity of the chassis sand core (1) is provided with a boss. The flow channel sand core (5) and the inner hole sand core (9) are interlocked on the boss in sequence. The gating and riser sand core (17) is supported on the upper housing mold sand core (14) and the inner hole sand core (9). The gating and riser sand core (17) is interlocked with the upper housing mold sand core (14). The lower housing mold sand core (2), the upper housing mold sand core (14), the upper housing mold sand core (14), and the inner hole sand core (9) together form the casting cavity of the turbocharger turbine housing.

[0007] The upper shell mold sand core (14), lower shell mold sand core (2), and gating and riser sand core (17) are respectively provided with sprues (22). The gating and riser sand core (17) is provided with a top riser (18), and the upper shell mold sand core (14) is provided with a side riser (23). The top riser (18) and the side riser (23) are connected to the casting cavity. The top surface of the lower shell mold sand core (2) is provided with a lower horizontal gating (24), and the top of both ends of the lower horizontal gating (24) is provided with filter screen grooves (25). A filter screen is installed in the filter screen groove (25). The bottom surface of the upper shell mold sand core (14) is provided with an internal gate (11) and an upper horizontal runner (12) that are interconnected. The internal gate (11) is connected to the casting cavity (21). The upper horizontal runner (12) is partially disconnected from the sprue (22) to form two sections. The two sections of the upper horizontal runner (12) are connected to the filter screens (25) at both ends of the lower horizontal runner (24). One side of the middle section of the lower horizontal runner (24) is connected to the sprue (22).

[0008] Preferably, the flow channel sand core (5) has two core heads (27, 8) and a core seat. The upper shell mold sand core (14) and the lower shell mold sand core (2) are provided with a core seat corresponding to one core head (27) of the flow channel sand core (5). The inner hole sand core (9) is provided with a core seat corresponding to the other core head (8) of the flow channel sand core (5). The chassis sand core (1) is provided with a core head corresponding to the core seat (7) of the flow channel sand core (5). Each core seat is respectively engaged and positioned with the corresponding core head.

[0009] Preferably, the flow channel sand core (5), the inner hole sand core (9) and the gating and riser sand core (17) are respectively provided with vent holes, and the vent holes of the flow channel sand core (5) and the inner hole sand core (9) are connected to the vent holes of the gating and riser sand core (17).

[0010] Preferably, it also includes a pressure edge riser sand core (20), which is installed on the edge of the upper shell mold sand core (14). The pressure edge riser sand core (20) is provided with a pressure edge riser (19). The upper shell mold sand core (14) and the lower shell mold sand core (2) are provided with a channel around the core head (27) of the corresponding flow channel sand core (5). The channel connects the pressure edge riser (19) and the casting cavity.

[0011] Preferably, the top surface of the upper shell mold core (14) and the bottom surface of the lower shell mold core (2) are provided with multiple reinforcing ribs to ensure strength; the parting surface of the lower shell mold core (2) is provided with a concave stop (13), the parting surface of the upper shell mold core (14) is provided with a convex stop, the convex stop and the concave stop (13) are engaged and positioned, the parting surface of the lower shell mold core (2) is provided with a protruding positioning pin (28), the protruding positioning pin (28) is located outside the concave stop (13), the parting surface of the upper shell mold core (14) is provided with a positioning groove corresponding to the protruding positioning pin (28), the positioning groove and the protruding positioning pin (28) are engaged.

[0012] Preferably, at the narrowest position of the gap inside the flow channel sand core (5), a separate flow channel sub-sand core (3) is provided. The surface of the flow channel sub-sand core (3) corresponding to the gap is provided with a groove structure. The flow channel sand core (5) and the flow channel sub-sand core (3) are bonded together with sand core glue to form a whole.

[0013] A combined sand core shooting method for turbocharger turbine housing, including a gating system,

[0014] The core shooting method for the upper shell mold core (14) adopts the horizontal parting core shooting method:

[0015] After installing the horizontal parting mold and ensuring normal trial operation, add 50 / 100 mesh coated sand to the sand storage tank, connect the power supply to the heating tube of the horizontal parting mold, and set the parameters on the control box: fixed mold temperature 310℃, moving mold temperature 310℃, sand injection time 5 seconds, curing time 240 seconds. After starting the power button and waiting for the upper and lower mold temperatures to reach the set values, start the work button and the sand injection plate (40) moves above the upper mold (33). The sand injection plate nozzle (44) and rubber... When the ring (43) is aligned with the upper mold nozzle (32) and pressed for sand injection for 5 seconds, and the temperature is maintained for 240 seconds, the lower mold (35) separates. At the same time, the upper ejector rod (47) pushes the upper box shell mold sand core (14) of the upper mold part out of the upper mold, and the lower mold ejector rod (39) pushes the upper box shell mold sand core (14) out of the lower mold (35). The core fork is inserted into the bottom of the upper box shell mold sand core (14), the lower mold ejector rod (39) is reset, the core fork removes the upper mold shell mold sand core (14), and the core injection is completed.

[0016] The core shooting method for the lower housing shell mold sand core (2) is the same as that for the upper housing shell mold sand core (14);

[0017] The core shooting method for the runner sand core (5) and the runner split sand core (3) adopts the vertical parting core shooting method:

[0018] After installing the vertical parting mold and ensuring normal trial operation, add 50 / 100 mesh coated sand to the sand storage tank. Connect the heating tube power supply of the vertical parting mold as required. Set the parameters on the control box: fixed mold temperature 260℃, moving mold temperature 260℃, sand injection time 4 seconds, curing time 240 seconds. After starting the power button and waiting for the upper and lower mold temperatures to reach the set values, start the work button and move the sand injection plate (63) above the mold nozzles (50, 52). The mold nozzles (50, 52) correspond to the flow channel sand core (5), the flow channel dividing sand core (3), the sand injection plate nozzle (64), and the rubber ring (65), respectively. Align the injection nozzles (50, 52) with the mold and press them for 4 seconds. After holding the temperature for 240 seconds, the moving mold (48) separates. At the same time, the fixed mold ejector (59) uses the horizontal thrust generated by the spring guide post (60) to push the runner sand core (5) and runner sub-sand core (3) of the fixed mold part out of the fixed mold (57). The moving mold (48) rotates 90 degrees with the runner sand core (5) and runner sub-sand core (3). The moving mold ejector rod (54) pushes out the runner sand core (5) and runner sub-sand core (3) and they fall onto the core receiving cart and exit. The operator takes out the runner sand core (5) and runner sub-sand core (3), and the core shooting is completed.

[0019] Preferably, the horizontal parting mold includes a lower mold (35), a lower mold heating tube (34), a lower mold base connecting groove (36), a lower mold top plate (38), a lower mold top rod (39), an upper mold base connecting groove (30), an upper mold (33), an upper mold heating tube (31), and an upper mold nozzle (32). The lower mold (35) is movable, and the upper mold (33) is fixed.

[0020] The method for installing the horizontal parting mold is as follows: Align the lower mold base connecting groove (36) with the moving template T-slot and positioning pin at the bottom of the horizontal parting core shooting machine, insert the screw, lift the moving template to the upper sand injection port connection port of the horizontal parting core shooting machine, and align and connect the connecting hole (42) on the sand injection plate (40). Remove the sand injection plate (40), insert the ejector rod (47) on the top core plate (45) into the upper mold nozzle (32), and align the upper mold base connecting groove (30) with the connecting hole on the horizontal parting core shooting machine. Then align the upper mold base connecting groove (30) with the upper fixed template T-slot of the horizontal parting core shooting machine and connect and lock it with the screw. Then lock the lower mold base connecting groove (36) with the moving template T-slot at the bottom of the horizontal parting core shooting machine.

[0021] Preferably, the vertical parting mold includes a moving mold heating tube (56), a moving mold top plate (53), a guide pillar (55), a moving mold support connecting groove (49), a moving mold top rod (54), a moving mold (48), two injection nozzles (50, 52), a fixed mold (57), a fixed mold ejector rod (59), a spring guide pillar (60), a fixed mold support connecting groove (62), a fixed mold top plate (61), and a fixed mold heating tube (58);

[0022] The method for installing the vertical parting mold is as follows: After tightening the moving mold (48) and the fixed mold (57) with bolts, align the fixed mold bracket connecting groove (62) with the fixed mold T-slot of the vertical parting core shooting machine and connect them with screws. Align the moving mold bracket connecting groove (49) with the moving mold T-slot of the vertical parting core shooting machine and connect them with screws. Align the connecting hole (66) on the sand shooting plate (63) with the sand shooting plate connecting hole on the vertical parting core shooting machine and connect them firmly with screws.

[0023] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0024] This invention designs a casting process for turbocharger turbine housing composite sand cores based on product casting drawings and material specifications. The casting uses furan self-hardening resin sand to mold (core) the chilled and non-cavity parts, solving the problems of difficulty and low efficiency in adding chills to coated sand cores. The important cavity parts use coated sand cores. A core shooter is used to connect to a hot core box mold and perform heating, sand shooting, heat preservation, and hardening to achieve the molding (core). This invention can reduce the skill requirements of workers and reduce their labor, rapidly improving the product quality and production efficiency of turbocharger turbine housings. It is an excellent solution for mass production products. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 Schematic diagram of the flow channel sand core;

[0027] Figure 3 A top view of the casting gating system;

[0028] Figure 4 This is a schematic diagram of a partial cross-section of the horizontal runner FF;

[0029] Figure 5 This is a schematic diagram of the cross-section of the side riser EE;

[0030] Figure 6 This is a top view of the sand core of the upper casing mold;

[0031] Figure 7 This is a schematic diagram of a partial cross-section of the GG nozzle;

[0032] Figure 8 This is a schematic diagram of the CC cross-section of the upper and lower shell mold sand cores.

[0033] Figure 9 A top view of the riser sand core;

[0034] Figure 10 This is a bottom view of the sand core of the lower casing mold;

[0035] Figure 11This is a schematic diagram of the cross-section of a horizontal core-shooting mold;

[0036] Figure 12 This is a schematic diagram of the cross-section of the sand-shooting plate of a horizontal core-shooting mold;

[0037] Figure 13 This is a schematic diagram of the cross-section of the top sand plate of the horizontal core-shooting mold;

[0038] Figure 14 This is a right-side view of the moving mold in a vertical core-shooting mold.

[0039] Figure 15 This is a top view of the vertical core-shooting mold assembly;

[0040] Figure 16 This is a cross-sectional view of the sand-shooting plate of a vertical core-shooting mold. Detailed Implementation

[0041] See Figures 1-10 A combined sand core casting system for a turbocharger turbine housing includes a #1 chassis sand core, a #2 lower housing mold sand core, a #3 runner sand core, a chill, a #3 runner sand core, exhaust holes for #3, #5, and #6 sand cores, a chassis sand core head (#3 runner sand core seat), a #3 runner sand core head (#5 sand core seat), a #5 inner hole sand core, a #5 sand core chill, an inner gate, an upper horizontal runner, upper and lower housing mold sand core stops, and an upper housing mold sand core. 14. Sand filling groove; 15. No. 6 gating and riser sand core head (upper box shell mold sand core core seat); 16. No. 6 gating and riser sand core; 17. Top riser; 18. Edge riser; 19. No. 7 edge riser sand core; 20. Casting cavity; 21. Straight sprue; 22. Side riser; 23. Lower horizontal sprue; 24. Filter screen groove; 25. No. 4 upper box shell mold sand core reinforcing rib; 26. No. 3 runner sand core pipe head; 27. No. 2 and No. 4 sand core positioning pins; 28. (convex stop); 29. ​​No. 2 lower box shell mold sand core reinforcing rib. The No. 1 chassis sand core has a convex core head 7 at its center. Eight conformal chills 4 are provided around the bottom flange of the core head 7, spaced 20mm apart. A sand filling groove 15 is provided around the upper inner side of the chassis sand core. A conformal stop is provided below the sand filling groove 15, forming a clearance fit with the lower section of the outer side of the lower housing mold sand core 2. Multiple conformal reinforcing ribs 29 are provided on the back of the lower housing mold sand core 2 (see...). Figure 10 To ensure the strength of the lower casing mold sand core 2, a conformal stop 13 is provided on the inner side of the upper surface of the front side. A pair of protruding positioning pins 28 are provided on both sides of the lower casing mold sand core 2. A core seat is provided on the lower half of the core head 27 corresponding to the pipe opening. A lower horizontal sprue 24 is provided on one side of the front side. Rectangular filter screen grooves 25 are provided at both ends of the lower horizontal sprue 24. The groove depth is 2mm, and the groove width must be greater than the width of the lower horizontal sprue 12 by 5mm on each side, so that the upper horizontal sprue 12 can press the filter screen tightly. The lower horizontal sprue 24 is connected to the straight sprue 22 in the middle. The No. 3 flow channel sand core 5 and the No. 3a sand core 3 need to be glued together to form a whole (see Figure 2The #3 flow channel sand core 5 has a core seat 7 on its back center, which forms a gap support fit with the convex core head 7 at the center of the #1 chassis sand core. A convex core head 8 is provided on the center surface of the front side. A through-hole vent 6 is provided at the center of the front core head and the back core seat. A core head 27 is provided at the opening of the #3 flow channel sand core. The lower half of the core head 27 forms a gap support fit with the corresponding #2 lower housing mold core seat. The #4 upper housing mold sand core 14 has a conformal stop 13 on its outer back side, which forms a gap fit with the conformal stop 13 on the inner side of the upper surface of the #2 housing mold sand core. A pair of recessed positioning pin grooves 28 (positioning grooves) are provided on both sides, which form a gap fit with the protruding positioning pin on the front side of the #2 lower housing mold sand core 2 for positioning (see...). Figure 8 The back side, corresponding to the upper half of the No. 3 runner sand core head 27, has a core seat that forms a gap and presses together to prevent the No. 3 runner sand core head from floating. The bottom side of the No. 4 upper shell mold sand core 14 has eight ingates 11, evenly distributed and connected to the side ribs of the casting cavity 21. One side of the ingates 11 has an upper horizontal runner 12, which is interrupted in the middle of the sprue 22 (see...). Figure 4 This forms two upper horizontal runners 12, which are respectively connected to the filter screens 25 at both ends of the ingate and the lower horizontal runner 24 (see...). Figure 4 This allows molten iron to pass through the lower horizontal gating filter screen 25 into the upper horizontal gating 12, thus serving as a slag-blocking mechanism. One end of the upper horizontal gating 12 has a connecting side riser 23, which is used to compensate for and eliminate heat spots on the corresponding square gating (see...). Figure 3 , Figure 5 The front of the No. 4 upper shell mold sand core 14 is provided with multiple reinforcing ribs 26. The sprue 22 on one side of the front is connected to the lower horizontal sprue 24. A core seat 16 is provided corresponding to the core head 16 of the No. 6 sand core 17. The back of the No. 5 core 9 with inner hole is provided with a core seat 8 corresponding to the core head 8 on the front of the No. 3 flow channel sand core 5. A vent hole 6 is provided in the center and is connected to the vent hole 6 of the No. 3 core. Three conformal chills 10 are provided at the lower end of the circumferential surface of the No. 5 core, with a spacing of 15mm. The back of the No. 6 sand core 17 is provided with a positioning core head 16, which forms a gap support fit with the core seat 16 on the front of the No. 4 upper shell mold sand core 14. Two conformal top risers 18 are provided on one side of the No. 6 sand core 17 and are connected to the top of the flange of the casting cavity 21, so as to achieve effective feeding to eliminate hot spots. A vent hole 6 is provided in the middle of the two top risers corresponding to the vent hole 6 of the No. 5 sand core 9 and is connected. A sprue 22 is provided and is connected to the sprue of the No. 4 upper shell mold sand core 14. The No. 7 sand core 20 is provided with a pressure edge riser 19. The lower end of the pressure edge riser 19 forms a clearance fit with the concave stop of the corresponding No. 4 upper box shell mold sand core 14 and is connected to the bottom of the pressure edge riser.

[0042] A combined sand core shooting method for a turbocharger turbine housing includes:

[0043] Process plan:

[0044] Serial Number name quantity Sand core categories Accessories equipment 1 #2 Lower Box Shell Mold Sand Core 1 mold 1 piece Coated Sand One upper mold sand-shooting plate and one top core plate. Horizontal parting core shooting machine 2 4# Upper Box Shell Mold Sand Core 1 mold 1 piece Coated Sand One upper mold sand-shooting plate and one top core plate. Horizontal parting core shooting machine 3 3# and 3# flow channel sand cores 1 mold 2 pieces Coated Sand One sandblasting plate Vertical parting core shooting machine 4 #1 Chassis Sand Core 1 mold 1 piece Resin Sand complete set Handmade aluminum mold 5 5# Inner Hole Sand Core 1 mold 1 piece Resin Sand complete set Handmade aluminum mold 6 6# riser sand core 1 mold 1 piece Resin Sand complete set Handmade aluminum mold 7 7# Flanged riser core 1 mold 1 piece Resin Sand complete set Handmade aluminum mold

[0045] Note: High-precision coated sand cores with good surface quality are used for the inner and outer cavities of the casting. The size and sand injection volume of the upper and lower shell mold sand cores are suitable for horizontal mold parting core shooting machines. The size and sand injection volume of the No. 3 and No. 3 runner sand cores are suitable for vertical mold parting core shooting machines. Resin sand cores are used for non-cast cavity parts, and manual mold core making is used.

[0046] This case only pertains to core shooting methods for coated sand cores, including:

[0047] Horizontal parting core injection mold schematic diagram (see) Figure 11 ):

[0048] The components are: lower mold 35 (moving mold), lower mold heating tube 34, lower mold base connecting groove 36, lower mold top core plate 38, lower mold top core rod 39, upper mold base connecting groove 30, upper mold (fixed mold) 33, heating tube 31, and upper mold nozzle 32.

[0049] Schematic diagram of horizontal parting line shot blasting plate (see...) Figure 12 ): Shot plate 40, rubber ring 43, connecting hole 42, nozzle 44, rubber pad 41.

[0050] Schematic diagram of the top core plate of the horizontal parting mold (see...) Figure 13 ): Top core plate 45, connecting groove 46, top core rod 47.

[0051] Schematic diagram of vertical parting core injection mold (see) Figure 14 , 15 ): Moving mold heating tube 56, moving mold top plate 53, guide post 55, moving mold support connecting groove 49, moving mold top rod 54, moving mold 48, nozzle 50, nozzle 52, fixed mold 57, fixed mold ejector rod 59, spring guide post 60, fixed mold support connecting groove 62, top plate 61, fixed mold heating tube 58.

[0052] Schematic diagram of vertical parting shot blasting plate (see) Figure 16 ): Connecting hole 66, sand-shooting plate 63, rubber ring 65, rubber pad 67, sand-blocking plate 68, nozzle 64.

[0053] Upper housing mold sand core shooting method:

[0054] Horizontal mold parting mold installation: Align the lower mold base connecting groove 36 with the moving template T-slot and positioning pin at the bottom of the equipment, insert the screw and tighten without locking, lift the moving template to the sand injection port connection port at the top of the equipment and align the connecting hole 42 on the sand injection plate 40, remove the sand injection plate 40, insert the ejector rod 47 on the top core plate 45 into the upper mold nozzle 32 and align the connecting groove 30 with the connecting hole on the equipment, then align the mold base connecting groove 30 with the fixed template T-slot at the top of the equipment and tighten with screws, and then tighten the lower mold base connecting groove 36 with the moving template T-slot at the bottom of the equipment.

[0055] Horizontal parting core shooting method: After the mold is installed and the trial run is normal, add 50 / 100 mesh coated sand to the sand storage tank. Connect the power supply of heating tubes 31 and 34 as required. Set the parameters on the control box: fixed mold temperature 310℃, moving mold temperature 310℃, sand shooting time 5 seconds, curing time 240 seconds. After starting the power button and waiting for the upper and lower mold temperatures to reach the set values, start the working button and the sand shooting plate 40 moves above the upper mold 33. The nozzle 44 is aligned with the rubber ring 43 of the upper mold nozzle 32 and pressed tightly for sand shooting for 5 seconds. After holding the temperature for 240 seconds, the lower mold 35 separates. At the same time, the upper ejector rod 47 pushes the upper shell mold sand core 14 of the upper mold part out of the upper mold 33. The lower mold ejector rod 39 pushes the upper shell mold sand core 14 out of the lower mold 35. The core-removing fork is inserted into the bottom of the upper shell mold sand core 14. The lower mold ejector rod 39 returns to its original position. The core-removing fork removes the upper shell mold sand core 14, and the core shooting is completed.

[0056] Core shooting method for lower housing mold sand core:

[0057] The mold installation and core shooting method are the same as the sand core shooting method for the box shell mold.

[0058] Core shooting method for flow channels #3 and #3:

[0059] Vertical mold parting installation: After tightening the moving mold 48 and the fixed mold 57 with bolts, align the fixed mold bracket connecting groove 62 with the fixed mold T-slot of the vertical mold parting core shooting machine and connect them with screws. Align the moving mold bracket connecting groove 49 with the moving mold T-slot of the vertical mold parting core shooting machine and connect them with screws. Align the connecting hole 64 on the sand shooting plate 63 with the sand shooting plate connecting hole on the equipment and connect them firmly with screws. After loosening the locking bolts, test run and installation is complete after normal operation.

[0060] Vertical parting core shooting method: After the mold is installed and the trial run is normal, add 50 / 100 mesh coated sand into the sand storage tank, connect the power supply of heating tubes 50 and 52 as required, and set the parameters on the control box: fixed mold temperature 260, moving mold temperature 260, sand shooting time 4 seconds, curing time 240 seconds. After the upper and lower mold temperatures reach the set values, press the start button and the sand injection plate 63 moves above the planes of nozzles 50 and 52. The sand injection plate nozzles 64 and rubber rings 65 are aligned with the mold nozzles 50, 52 and 27 and pressed together for sand injection for 4 seconds. After holding the temperature for 240 seconds, the moving mold 48 separates. At the same time, the fixed mold ejector rod 59 uses the horizontal rightward thrust generated by the spring guide post 60 to push the #3 and #3 runner sand cores 5 and 3 out of the fixed mold part and away from the fixed mold 57. The moving mold 48 rotates 90 degrees with the #3 and #3 runner sand cores. The moving mold ejector rod 54 pushes the #3 and #3 runner sand cores out and they fall onto the core receiving cart and exit. The operator takes out the #3 and #3 runner sand cores 5 and 3, and the core injection is completed.

[0061] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A turbocharger turbine housing composite sand core casting system, characterized in that: The casting includes a chassis sand core (1) and a riser sand core (17). The chassis sand core (1) has an inner cavity. The outer side of the inner cavity of the chassis sand core (1) is provided with a lower housing mold sand core (2) and an upper housing mold sand core (14). The lower housing mold sand core (2) and the upper housing mold sand core (14) are interlocked. The center of the inner cavity of the chassis sand core (1) is provided with a boss. The flow channel sand core (5) and the inner hole sand core (9) are interlocked on the boss in sequence. The riser sand core (17) is supported on the upper housing mold sand core (14) and the inner hole sand core (9). The riser sand core (17) is interlocked with the upper housing mold sand core (14). The lower housing mold sand core (2), the upper housing mold sand core (14), the upper housing mold sand core (14), and the inner hole sand core (9) form a casting cavity for the turbocharger turbine housing. The upper shell mold sand core (14), lower shell mold sand core (2), and gating and riser sand core (17) are respectively provided with sprues (22). The gating and riser sand core (17) is provided with a top riser (18), and the upper shell mold sand core (14) is provided with a side riser (23). The top riser (18) and the side riser (23) are connected to the casting cavity. The top surface of the lower shell mold sand core (2) is provided with a lower horizontal gating (24), and the top of both ends of the lower horizontal gating (24) is provided with filter screen grooves (25). A filter screen is installed in the filter screen groove (25). The bottom surface of the upper box shell mold sand core (14) is provided with an internal gate (11) and an upper horizontal runner (12) that are interconnected. The internal gate (11) is connected to the casting cavity (21). The upper horizontal runner (12) is partially disconnected from the straight runner (22) to form two sections. The two sections of the upper horizontal runner (12) are connected to the filter screen groove (25) at both ends of the lower horizontal runner (24). One side of the middle section of the lower horizontal runner (24) is connected to the straight runner (22). The flow channel sand core (5) has two core heads (27, 8) and a core seat. The upper box shell mold sand core (14) and the lower box shell mold sand core (2) are provided with a core seat corresponding to one core head (27) of the flow channel sand core (5). The inner hole sand core (9) is provided with a core seat corresponding to the other core head (8) of the flow channel sand core (5). The chassis sand core (1) is provided with a core head corresponding to the core seat (7) of the flow channel sand core (5). Each core seat is respectively engaged and positioned with the corresponding core head. Vent holes are provided on the core head of the flow channel sand core (5), the inner hole sand core (9), and the gating and riser sand core (17), respectively. The vent holes of the core head of the flow channel sand core (5) and the inner hole sand core (9) are connected to the vent holes of the gating and riser sand core (17). The top surface of the upper shell mold sand core (14) and the bottom surface of the lower shell mold sand core (2) are provided with multiple reinforcing ribs to ensure strength; the parting surface of the lower shell mold sand core (2) is provided with a concave stop (13), the parting surface of the upper shell mold sand core (14) is provided with a convex stop, the convex stop and the concave stop (13) are engaged and positioned, the parting surface of the lower shell mold sand core (2) is provided with a protruding positioning pin (28), the protruding positioning pin (28) is located outside the concave stop (13), the parting surface of the upper shell mold sand core (14) is provided with a positioning groove corresponding to the protruding positioning pin (28), the positioning groove is engaged with the protruding positioning pin (28); At the narrowest point of the gap inside the flow channel sand core (5), a separate flow channel sub-sand core (3) is provided. The surface of the flow channel sub-sand core (3) corresponding to the gap is provided with a groove structure. The flow channel sand core (5) and the flow channel sub-sand core (3) are bonded together with sand core glue to form a whole.

2. The turbocharger turbine housing composite sand core casting system according to claim 1, characterized in that: It also includes a pressure edge riser sand core (20), which is installed on the edge of the upper box mold sand core (14). The pressure edge riser sand core (20) is provided with a pressure edge riser (19). The upper box mold sand core (14) and the lower box mold sand core (2) are provided with a channel around the core head (27) of the corresponding flow channel sand core (5). The channel connects the pressure edge riser (19) and the casting cavity.

3. A method for core shooting of a combined sand core for a turbocharger turbine housing, characterized in that, Including the gating system as described in claim 1, The core shooting method for the upper shell mold core (14) adopts the horizontal parting core shooting method: After installing the horizontal parting mold and ensuring normal trial operation, add 50 / 100 mesh coated sand to the sand storage tank, connect the power supply to the heating tube of the horizontal parting mold, and set the parameters on the control box: fixed mold temperature 310℃, moving mold temperature 310℃, sand injection time 5 seconds, curing time 240 seconds. After starting the power button and waiting for the upper and lower mold temperatures to reach the set values, start the work button and move the sand injection plate (40) above the upper mold (33). The sand injection plate nozzle (44) and rubber... When the ring (43) is aligned with the upper mold nozzle (32) and the sand is pressed for 5 seconds, and the temperature is maintained for 240 seconds, the lower mold (35) separates. At the same time, the core rod (47) pushes the upper box shell mold sand core (14) of the upper mold part out of the upper mold. The core rod (39) of the lower mold pushes the upper box shell mold sand core (14) out of the lower mold (35). The core fork is inserted into the bottom of the upper box shell mold sand core (14). The core rod (39) of the lower mold resets. The core fork removes the upper mold shell mold sand core (14). The core injection is completed. The core shooting method for the lower housing shell mold sand core (2) is the same as that for the upper housing shell mold sand core (14); The core shooting method for the runner sand core (5) and the runner split sand core (3) adopts the vertical parting core shooting method: After installing the vertical parting mold and ensuring normal trial operation, add 50 / 100 mesh coated sand to the sand storage tank. Connect the heating tube power supply of the vertical parting mold as required. Set the parameters on the control box: fixed mold temperature 260℃, moving mold temperature 260℃, sand injection time 4 seconds, curing time 240 seconds. After starting the power button and waiting for the upper and lower mold temperatures to reach the set values, start the work button and move the sand injection plate (63) above the mold nozzles (50, 52). The mold nozzles (50, 52) correspond to the flow channel sand core (5), the flow channel dividing sand core (3), the sand injection plate nozzle (64), and the rubber ring (65), respectively. Align the injection nozzles (50, 52) with the mold and press them for 4 seconds. After holding the temperature for 240 seconds, the moving mold (48) separates. At the same time, the fixed mold ejector (59) uses the horizontal thrust generated by the spring guide post (60) to push the runner sand core (5) and runner sub-sand core (3) of the fixed mold part out of the fixed mold (57). The moving mold (48) rotates 90 degrees with the runner sand core (5) and runner sub-sand core (3). The moving mold ejector rod (54) pushes out the runner sand core (5) and runner sub-sand core (3) and they fall onto the core receiving cart and exit. The operator takes out the runner sand core (5) and runner sub-sand core (3), and the core shooting is completed.

4. The core shooting method for a combined sand core coated sand of a turbocharger turbine housing according to claim 3, characterized in that: The horizontal parting mold includes a lower mold (35), a lower mold heating tube (34), a lower mold base connecting groove (36), a lower mold top core plate (38), a lower mold top core rod (39), an upper mold base connecting groove (30), an upper mold (33), an upper mold heating tube (31), and an upper mold nozzle (32). The lower mold (35) is movable, and the upper mold (33) is fixed. The method for installing the horizontal parting mold is as follows: Align the lower mold base connecting groove (36) with the moving template T-slot and positioning pin at the bottom of the horizontal parting core shooting machine, insert the screw, lift the moving template to the upper sand injection port connection port of the horizontal parting core shooting machine, and align the connecting hole (42) on the sand injection plate (40) and connect it, remove the sand injection plate (40), insert the top core rod (47) on the top core plate (45) into the upper mold nozzle (32), align the upper mold base connecting groove (30) with the connecting hole on the horizontal parting core shooting machine, then align the upper mold base connecting groove (30) with the upper fixed template T-slot of the horizontal parting core shooting machine and connect and lock it with the screw, and then lock the lower mold base connecting groove (36) with the moving template T-slot at the bottom of the horizontal parting core shooting machine.

5. The core shooting method for a combined sand core coated sand of a turbocharger turbine housing according to claim 3, characterized in that: The vertical parting mold includes a moving mold heating tube (56), a moving mold top plate (53), a guide pillar (55), a moving mold support connecting groove (49), a moving mold top rod (54), a moving mold (48), two injection nozzles (50, 52), a fixed mold (57), a fixed mold ejector rod (59), a spring guide pillar (60), a fixed mold support connecting groove (62), a fixed mold top plate (61), and a fixed mold heating tube (58). The method for installing the vertical parting mold is as follows: After tightening the moving mold (48) and the fixed mold (57) with bolts, align the fixed mold bracket connecting groove (62) with the fixed mold T-slot of the vertical parting core shooting machine and connect them with screws. Align the moving mold bracket connecting groove (49) with the moving mold T-slot of the vertical parting core shooting machine and connect them with screws. Align the connecting hole (66) on the sand shooting plate (63) with the sand shooting plate connecting hole on the vertical parting core shooting machine and connect them firmly with screws.

Images