Sand mold casting model for connected exhaust pipe
By setting the thermal expansion gap and annular cold iron in the sand casting model for the joint exhaust pipe, the volute shrinkage and burr problems are solved, achieving uniform cooling and reducing burr risks.
Patent Information
- Application Number
- CN202422311216.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The existing cold iron model cannot effectively solve the volute shrinkage defect of the joint exhaust pipe, and there is a risk of burrs at the volute.
A sand casting model for joint exhaust pipes is designed, using the main sand core and the gas chamber sand core assembly, and the first and second connecting grooves are provided. The gas chamber sand core assembly includes the gas chamber sand core and annular cold iron. The annular cold iron sleeve is arranged on the side wall of the gas chamber sand core, and a thermal expansion gap is set at the key parts to uniformly cool and accommodate thermal expansion.
The uniform and rapid cooling of the volute of the joint exhaust pipe is achieved, reducing the volute shrinkage and reducing the risk of burr formation.
Smart Images
Figure CN223222417U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sand casting, in particular to a sand casting model for a conjoined exhaust pipe. Background Art
[0002] When risers cannot be placed in thick parts of the complex inner cavity of the casting, chillers are usually placed to chill the thick parts of the casting so that the high-temperature molten metal in the thick parts of the casting can be quickly cooled, thereby avoiding shrinkage defects in the thick parts of the casting.
[0003] The inner volute of a one-piece exhaust pipe is relatively thick, while the wall thickness of the connecting area around the volute is relatively thin. This makes shrinkage defects more likely to occur in the thick inner volute area of the one-piece exhaust pipe. Traditionally, a semi-circular chiller is placed inside the volute of the one-piece exhaust pipe. However, this chiller is small in size and can absorb little heat, which has a limited chilling effect on the annular volute. Furthermore, the semi-circular chiller cannot simultaneously chill the annular volute. As a result, the annular volute cools faster where the semi-circular chiller is placed, and slower where the chiller is absent, failing to effectively address the shrinkage problem.
[0004] The existing chiller placement method mainly involves placing an annular chiller on the end face of the volute of the integrated exhaust pipe. The annular chiller is placed inside the main sand core. Under the action of high-temperature molten iron, the annular chiller expands due to heat. The expansion rate of the annular chiller greatly exceeds that of the main sand core, eventually causing the main sand core to crack due to the annular chiller. The high-temperature molten iron enters the cracks in the main sand core, forming burrs on the volute that are difficult or impossible to clean.
[0005] Therefore, how to provide a cold iron model that can effectively solve the shrinkage defect of the conjoined exhaust pipe volute and effectively reduce the risk of burrs appearing in the volute part is an urgent problem to be solved. Utility Model Content
[0006] The purpose of the utility model is to provide a sand casting model for a one-piece exhaust pipe, so as to effectively solve the shrinkage defect of the volute of the one-piece exhaust pipe and effectively reduce the risk of burrs appearing on the volute.
[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0008] A sand casting model for a connected exhaust pipe comprises a main sand core and an air chamber sand core assembly, wherein a first connecting groove is provided at one end of the main sand core, and a second connecting groove is provided at the bottom of the first connecting groove; the air chamber sand core assembly is sleeved in the first connecting groove and the second connecting groove, and the air chamber sand core assembly comprises an air chamber sand core and an annular cold iron; the annular cold iron is sleeved on the side wall of the air chamber sand core, and both ends of the annular cold iron are fitted with the air chamber sand core; a casting volute molding groove is formed between the side wall of the air chamber sand core, the side wall of the annular cold iron, the bottom of the first connecting groove and the groove wall of the first connecting groove; wherein a thermal expansion gap is provided between the end face of the air chamber sand core and the groove bottom of the second connecting groove, between the side wall of the air chamber sand core and the groove wall of the second connecting groove, and between the side wall of the annular cold iron and the groove wall of the second connecting groove.
[0009] A further technical solution is: the air chamber sand core includes a first connector, a second connector and a third connector; the second connector is sleeved on the annular cold iron; the first connector and the third connector are respectively connected to the two ends of the second connector, and the first connector and the second connector are respectively attached to the two ends of the annular cold iron; wherein, the thermal expansion gap is provided between the end face of the first connector away from the second connector and the bottom of the second connecting groove, and between the side wall of the first connector and the groove wall of the first connecting groove; a casting volute molding groove is formed between the side wall of the third connector and the side wall of the annular cold iron, the groove bottom of the first connecting groove, and the groove wall of the first connecting groove.
[0010] A further technical solution is: the annular cold iron includes a main body and a sand separator; the sand separator is connected to one end of the main body, and the sand separator and the main body are both sleeved on the side wall of the second connector; the end of the main body away from the sand separator is connected to the first connector, and the side wall of the main body and the side wall of the air chamber sand core, the bottom of the first connecting groove, and the groove wall of the first connecting groove form the casting volute molding groove; the thermal expansion gap is provided between the side wall of the main body and the groove wall of the second connecting groove; the end of the sand separator away from the main body is connected to the third connector; the air chamber sand core also includes an annular connector; the annular connector is sleeved on the side wall of the sand separator, and the two ends of the annular connector are respectively connected to the main body and the third connector.
[0011] A further technical solution is: a support member is provided on the side wall of the sand separator; the support member extends from one end of the sand separator to the other end of the sand separator, and the support member is embedded in the side wall of the annular connector.
[0012] A further technical solution is that the distance L between the side wall of the sand isolation piece and the casting volute forming groove is 2.0 mm to 3.0 mm.
[0013] A further technical solution is that the inner diameter d of the sand isolation member is 1 / 2 of the outer diameter D of the sand isolation member.
[0014] A further technical solution is: the thickness of the main body is M; the width of the casting volute molding groove is N; wherein N≤M≤2N.
[0015] A further technical solution is that the width Z of the thermal expansion gap is 0.5 mm to 1.0 mm.
[0016] Compared with the prior art, the beneficial effects of the present invention are:
[0017] During casting, the annular chiller contacts the volute portion of the casting within the volute forming groove, absorbing heat from the volute portion and rapidly chilling the volute portion. This effectively ensures that the annular chiller can evenly and quickly cool the volute portion, thereby reducing shrinkage in the volute portion.
[0018] On the other hand, after the annular chill and the air chamber sand core are heated, the thermal expansion gap between the annular chill and the main sand core, as well as between the air chamber sand core and the main sand core, ensures that the annular chill and the air chamber sand core have a certain expansion space after being heated, thereby reducing the risk of the annular chill and the air chamber sand core bursting the main sand core due to expansion, thereby effectively reducing the chance of high-temperature molten iron entering cracks and forming burrs that are difficult or impossible to clean in the volute part of the casting. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic cross-sectional view of a sand casting model for a one-piece exhaust pipe in this embodiment before casting;
[0020] Figure 2 This is a schematic diagram of a partial cross-sectional structure of a sand casting model for a one-piece exhaust pipe in this embodiment before casting;
[0021] Figure 3 Schematic diagram of the cross-sectional structure of the main sand core of a sand casting model for a one-piece exhaust pipe in this embodiment;
[0022] Figure 4 This is a schematic cross-sectional view of an air chamber sand core assembly of a sand casting model for a one-piece exhaust pipe in this embodiment;
[0023] Figure 5 This is a schematic diagram of the main structure of a ring-shaped chiller of a sand casting model for a one-piece exhaust pipe in this embodiment;
[0024] Figure 6 This is a schematic diagram of a top view of the annular chiller structure of a sand casting model for a one-piece exhaust pipe in this embodiment.
[0025] Markings and corresponding parts names in the accompanying drawings:
[0026] 1-Main sand core; 2-First connecting groove; 3-Second connecting groove;
[0027] 4-air chamber sand core assembly; 41-air chamber sand core; 411-first connector; 412-second connector; 413-third connector; 414-annular connector; 42-annular chiller; 421-main body; 422-sand isolation member;
[0028] 5- casting volute molding groove; 6- thermal expansion gap; 7- support part; 8- casting volute part. DETAILED DESCRIPTION
[0029] The present invention will be further described below in conjunction with the accompanying drawings.
[0030] Example
[0031] This embodiment provides a sand casting model for a conjoined exhaust pipe, such as Figure 1-Figure 3 As shown, it includes a main sand core 1 and an air chamber sand core assembly 4, and a first connecting groove 2 is opened at one end of the main sand core 1, and a second connecting groove 3 is opened at the bottom of the first connecting groove 2; the air chamber sand core assembly 4 is sleeved in the first connecting groove 2 and the second connecting groove 3, and the air chamber sand core assembly 4 includes an air chamber sand core 41 and an annular cold iron 42; the annular cold iron 42 is sleeved on the side wall of the air chamber sand core 41, and both ends of the annular cold iron 42 are in contact with the air chamber sand core 41; a casting volute molding groove 5 is formed between the side wall of the air chamber sand core 41, the side wall of the annular cold iron 42, the bottom of the first connecting groove 2 and the groove wall of the first connecting groove 2; wherein, a thermal expansion gap 6 is provided between the end face of the air chamber sand core 41 and the groove bottom of the second connecting groove 3, between the side wall of the air chamber sand core 41 and the groove wall of the second connecting groove 3, and between the side wall of the annular cold iron 42 and the groove wall of the second connecting groove 3.
[0032] For example, during implementation, a first connecting groove 2 is formed on the end surface of one end of the main sand core 1, and the first connecting groove 2 extends from the one end of the main sand core 1 to the other end of the main sand core 1. A second connecting groove 3 is formed at the bottom of the first connecting groove 2, and the second connecting groove 3 extends from the one end of the main sand core 1 to the other end of the main sand core 1.
[0033] The air chamber sand core assembly 4 includes an annular chill 42 and an air chamber sand core 41. The annular chill 42 is sleeved onto the sidewall of one end of the air chamber sand core 41, and both ends of the annular chill 42 are in contact with the air chamber sand core 41. In other words, the annular chill 42 sleeves onto the sidewall of the air chamber sand core 41 and is embedded in the sidewall of the air chamber sand core 41. One end of the air chamber sand core 41 is inserted into the first and second connecting grooves 2 and 3 of the main body sand core 1, along the direction from the first connecting groove 2 to the second connecting groove 3, and the annular chill 42 is inserted into the first and second connecting grooves 2 and 3.
[0034] A casting volute molding groove 5 is formed between the sidewall of the air chamber sand core 41 located within the first connecting groove 2, the groove wall of the first connecting groove 2, and the sidewall of the annular chill 42 located within the first connecting groove 2. Thermal expansion gaps 6 are provided between the end surface of one end of the air chamber sand core 41 and the groove bottom of the second connecting groove 3, between the sidewall of the air chamber sand core 41 located within the second connecting groove 3 and the groove wall of the second connecting groove 3, and between the sidewall of the annular chill 42 located within the second connecting groove 3 and the groove wall of the second connecting groove 3.
[0035] During casting, the annular chill 42 contacts the volute portion 8 of the casting within the volute forming groove 5 of the casting, and absorbs heat from the volute portion 8 of the casting, thereby quenching the volute portion of the casting. This effectively ensures that the annular chill 42 can cool the volute portion 8 of the casting evenly and quickly, thereby reducing the shrinkage phenomenon of the volute portion 8 of the casting. At the same time, after the annular chill 42 and the air chamber sand core 41 are heated, the thermal expansion gap 6 between the annular chill 42 and the main sand core 1, and between the air chamber sand core 41 and the main sand core 1, ensures that the annular chill 42 and the air chamber sand core 41 have a certain amount of expansion space after being heated, thereby reducing the risk of the annular chill 42 and the air chamber sand core 41 expanding and cracking the main sand core 1, thereby effectively reducing the probability of high-temperature molten iron entering cracks and forming burrs that are difficult or impossible to clean in the volute portion 8 of the casting. After the annular chill 42 is heated, it expands along its own axial direction. Because both ends of the annular chill 42 are in contact with the air chamber sand core 41, the annular chill 42 first squeezes the air chamber sand core 41, thereby reducing the risk of the annular chill 42 directly squeezing the main sand core 1 and causing the main sand core 1 to burst, thereby further effectively reducing the risk of high-temperature molten iron entering the cracks and forming burrs that are difficult or impossible to clean in the volute part 8 of the casting.
[0036] The channel inside the annular cold iron 42 can be used as a sand shooting channel when manufacturing the air chamber sand core 41, thereby achieving the purpose of improving the integrity of the air chamber sand core 41 during the manufacturing of the air chamber sand core 41.
[0037] Preferably, Figure 1 As shown, the width Z of the thermal expansion gap 6 is 0.5 mm to 1.0 mm.
[0038] In this embodiment, if Figure 1 and Figure 4 As shown, the air chamber sand core 41 includes a first connector 411, a second connector 412 and a third connector 413; the second connector 412 is sleeved on the annular cold iron 42; the first connector 411 and the third connector 413 are respectively connected to the two ends of the second connector 412, and the first connector 411 and the second connector 412 are respectively attached to the two ends of the annular cold iron 42; wherein, the thermal expansion gap 6 is provided between the end face of the first connector 411 away from the second connector 412 and the bottom of the second connecting groove 3, and between the side wall of the first connector 411 and the groove wall of the first connecting groove 2; a casting volute molding groove 5 is formed between the side wall of the third connector 413 and the side wall of the annular cold iron 42, the groove bottom of the first connecting groove 2, and the groove wall of the first connecting groove 2.
[0039] Exemplarily, during implementation, the air chamber sand core 41 includes a first connecting body 411 , a second connecting body 412 and a third connecting body 413 .
[0040] The second connector 412 is sleeved in the annular chiller 42 to support the annular chiller 42 .
[0041] The first connector 411 and the third connector 413 are integrally formed and connected to the ends of the second connector 412, respectively. The first connector 411 and the third connector 413 are respectively attached to the ends of the annular chill 42. A thermal expansion gap 6 is provided between the end face of the first connector 411 facing away from the second connector 412 and the bottom of the second connecting groove 3, and between the sidewall of the first connector 411 and the wall of the first connecting groove 2. This ensures that the ends of the annular chill 42 are respectively attached to the first connector 411 and the third connector 413, thereby reducing the risk of the annular chill 42 directly squeezing the main sand core 1 and causing it to crack when it expands axially after heating. The aforementioned casting volute molding groove 5 is formed between the sidewall of the third connector 413, the sidewall of the annular chill 42 near the third connector 413, the bottom of the first connecting groove 2, and the wall of the first connecting groove 2.
[0042] In this embodiment, if Figure 4 and Figure 5As shown, the annular cold iron 42 includes a main body 421 and a sand isolation member 422; the sand isolation member 422 is connected to one end of the main body 421, and the sand isolation member 422 and the main body 421 are both sleeved on the side wall of the second connecting body 412; the end of the main body 421 away from the sand isolation member 422 is connected to the first connecting body 411, and the side wall of the main body 421 and the side wall of the air chamber sand core 41, the bottom of the first connecting groove 2, and the groove wall of the first connecting groove 2 are formed. The casting volute molding groove 5 is formed; the thermal expansion gap 6 is provided between the side wall of the main body 421 and the groove wall of the second connecting groove 3; the end of the sand isolation member 422 away from the main body 421 is connected to the third connector 413; the air chamber sand core 41 also includes an annular connector 414; the annular connector 414 is sleeved on the side wall of the sand isolation member 422, and the two ends of the annular connector 414 are respectively connected to the main body 421 and the third connector 413.
[0043] For example, in the implementation process, the annular chill 42 includes a main body 421 and a sand separator 422. The sand separator 422 is connected to one end of the main body 421 by welding, integral molding, etc., and the sand separator 422 and the main body 421 are both sleeved on the side wall of the second connector 412.
[0044] The end of the main member 421 facing away from the sand barrier 422 is connected to the first connector 411. The sidewall of the main member 421 near the third connector 413, the sidewall of the air chamber sand core 41, the bottom of the first connecting groove 2, and the walls of the first connecting groove 2 form the aforementioned casting volute forming groove 5. During casting, the main member 421 contacts the casting volute portion 8 within the casting volute forming groove 5, absorbing heat from the casting volute portion 8 and thereby quenching the casting volute portion. This effectively ensures that the main member 421 can evenly and quickly cool the casting volute portion 8, thereby reducing shrinkage in the casting volute portion 8. A thermal expansion gap 6 is provided between the side wall of the main body 421 at one end close to the first connector 411 and the groove wall of the second connecting groove 3, so that the main body 421 can have a certain expansion space after being heated, thereby reducing the risk of the main body 421 bursting the main sand core 1 due to expansion, thereby effectively reducing the high-temperature molten iron from entering the cracks and the probability of forming burrs that are difficult or impossible to clean in the volute part 8 of the casting.
[0045] The end of the sand separator 422 away from the main body 421 is connected to the third connector 413. During casting, the sand separator 422 can simultaneously chill the area near the volute portion 8 of the casting within the volute forming groove 5, thereby further reducing the shrinkage of the volute portion 8.
[0046] The air chamber sand core 41 also includes an annular connector 414, which is sleeved onto the sidewall of the sand separator 422. The outer diameter of the sand separator 422 is smaller than that of the main body 421, allowing the ends of the annular connector 414 to be connected to the main body 421 and the third connector 413, respectively, by sandblasting. During casting, the annular connector 414 is isolated between the sand separator 422 and the casting. This facilitates the removal of the annular chill 42 from the casting during cleaning and polishing after completion, thereby reducing the risk of the annular chill 42 "burning" (adhering) to the volute portion 8 of the casting.
[0047] Preferably, Figure 1 As shown, the thickness of the main body 421 is M, and the width of the casting volute molding groove 5 is N, where N≤M≤2N. This allows the main body 421 to have a sufficiently large volume to absorb sufficient heat from the casting volute portion within the casting volute molding groove 5, thereby sufficiently reducing the temperature of the high-temperature molten metal within the casting volute molding groove 5, thereby achieving the purpose of reducing shrinkage in the casting volute portion 8.
[0048] Preferably, Figure 1 As shown, the distance L between the sidewall of the sand separator 422 and the casting volute molding groove 5 is 2.0 mm to 3.0 mm. This facilitates the molding of the annular connector 414 onto the sidewall of the sand separator 422. Furthermore, it ensures that the annular chill 42 can be easily removed from the casting during cleaning and polishing, reducing the risk of the annular chill 42 "burning" (adhering) to the casting volute portion 8.
[0049] Preferably, Figure 6 As shown, the inner diameter d of the sand isolation member 422 is 1 / 2 of the outer diameter D of the sand isolation member 422. This can effectively improve the integrity of the air chamber sand core 41 during its manufacture.
[0050] In this embodiment, if Figure 5 As shown, a support member 7 is provided on the side wall of the sand separator 422 ; the support member 7 extends from one end of the sand separator 422 to the other end of the sand separator 422 , and the support member 7 is embedded in the side wall of the annular connector 414 .
[0051] For example, during the implementation process, the support member 7 is connected to the side wall of the sand separator 422 by welding, integral molding, etc., and the support member 7 extends from one end of the sand separator 422 to the other end. When the air chamber sand core 41 is manufactured, the annular cold iron 42 can be fixed by the support member 7, thereby achieving the purpose of effectively reducing the effects of the cold iron shaking or displacement on the production efficiency and quality of the air chamber sand core 41 during the production of the air chamber sand core 41. After the annular connector 414 is manufactured, the annular connector 414 wraps around both sides of the support member 7, so that the support member 7 is embedded in the side wall of the annular connector 414, thereby achieving the purpose of effectively enhancing the connection strength between the sand separator 422 and the annular connector 414.
[0052] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or arrangement of the subject combination arrangement. In addition to variations and modifications to the components and / or arrangement, other uses will also be apparent to those skilled in the art.
Claims
1. A sand casting model for a conjoined exhaust pipe, characterized in that: include: A main sand core (1), wherein a first connecting groove (2) is provided at one end of the main sand core (1), and a second connecting groove (3) is provided at the bottom of the first connecting groove (2); An air chamber sand core assembly (4), wherein the air chamber sand core assembly (4) is sleeved in the first connecting groove (2) and the second connecting groove (3), and the air chamber sand core assembly (4) comprises an air chamber sand core (41) and an annular cold iron (42); the annular cold iron (42) is sleeved on the side wall of the air chamber sand core (41), and both ends of the annular cold iron (42) are in contact with the air chamber sand core (41); the side wall of the air chamber sand core (41), the annular cold iron (42) and the air chamber sand core (41) are in contact with each other. A casting volute forming groove (5) is formed between the side wall of the iron (42), the bottom of the first connecting groove (2) and the groove wall of the first connecting groove (2); wherein, thermal expansion gaps (6) are provided between the end face of the air chamber sand core (41) and the groove bottom of the second connecting groove (3), between the side wall of the air chamber sand core (41) and the groove wall of the second connecting groove (3), and between the side wall of the annular cold iron (42) and the groove wall of the second connecting groove (3).
2. The sand casting model for a conjoined exhaust pipe according to claim 1, characterized in that: The air chamber sand core (41) comprises a first connecting body (411), a second connecting body (412) and a third connecting body (413); The second connector (412) is sleeved on the annular cold iron (42); The first connector (411) and the third connector (413) are respectively connected to the two ends of the second connector (412), and the first connector (411) and the second connector (412) are respectively attached to the two ends of the annular cold iron (42); The thermal expansion gap (6) is provided between the end face of the first connector (411) away from the second connector (412) and the bottom of the second connecting groove (3), and between the side wall of the first connector (411) and the wall of the first connecting groove (2); and a casting volute molding groove (5) is formed between the side wall of the third connector (413), the side wall of the annular cold iron (42), the bottom of the first connecting groove (2), and the wall of the first connecting groove (2).
3. The sand casting model for a conjoined exhaust pipe according to claim 2, characterized in that: The annular chill (42) comprises a main body (421) and a sand isolation member (422); The sand isolation member (422) is connected to one end of the main body member (421), and the sand isolation member (422) and the main body member (421) are both sleeved on the side wall of the second connector (412); One end of the main body (421) away from the sand isolation member (422) is connected to the first connector (411), and the casting volute forming groove (5) is formed between the side wall of the main body (421), the side wall of the air chamber sand core (41), the bottom of the first connecting groove (2), and the groove wall of the first connecting groove (2); the thermal expansion gap (6) is provided between the side wall of the main body (421) and the groove wall of the second connecting groove (3); One end of the sand isolation member (422) away from the main body member (421) is connected to the third connector (413); The air chamber sand core (41) further includes an annular connector (414); The annular connector (414) is sleeved on the side wall of the sand isolation member (422), and two ends of the annular connector (414) are respectively connected to the main body (421) and the third connector (413).
4. The sand casting model for a conjoined exhaust pipe according to claim 3, characterized in that: The side wall of the sand isolation member (422) is provided with a support member (7); The support member (7) extends from one end of the sand isolation member (422) to the other end of the sand isolation member (422), and the support member (7) is embedded in the side wall of the annular connector (414).
5. The sand casting model for a conjoined exhaust pipe according to claim 4, characterized in that: The distance L between the side wall of the sand isolation member (422) and the casting volute forming groove (5) is 2.0 mm to 3.0 mm.
6. The sand casting model for a conjoined exhaust pipe according to claim 4, characterized in that: The inner diameter d of the sand isolation member (422) is 1 / 2 of the outer diameter D of the sand isolation member (422).
7. The sand casting model for a conjoined exhaust pipe according to claim 4, characterized in that: The thickness of the main body (421) is M; The width of the casting volute molding groove (5) is N; Among them, N≤M≤2N.
8. The sand casting model according to claim 1, wherein: The width Z of the thermal expansion gap (6) is 0.5 mm to 1.0 mm.