Casting forming die for compressor casing

Abstract

The invention relates to the technical field of mold casting machining, and particularly provides a compressor casing casting forming mold which comprises a base, a lower mold and an upper mold, a mold cavity is formed between the upper mold and the lower mold, and an exhaust pipe sand core and a runner sand core are arranged in the mold cavity in a matched mode; a T-shaped insert is arranged in the upper die, and a first clamping groove is formed in one side of the T-shaped insert; a second clamping groove is formed in the exhaust pipe sand core, and a clamping column is arranged in the first clamping groove and the second clamping groove in a matched mode at the same time. The exhaust pipe sand core can be reliably fixed relative to the T-shaped insert, and casting deviation is avoided; the exhaust pipe sand core is integrally taken out along with a casting during demolding, and is separated after being cooled, so that the adhesion risk is reduced; by means of structural innovation and improvement, the core problems that an exhaust pipe sand core is prone to deviation, demolding adhesion damage is caused and the like are systematically solved, the qualification rate and production efficiency of compressor shell castings are remarkably improved, and outstanding practicability and industrial popularization value are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mold casting and processing, in particular to a compressor casing casting mold. Background Art

[0002] As a crucial component of turbochargers, the compressor housing has gained widespread application in the automotive, marine, and aerospace sectors with the continuous advancement of turbocharging technology. Currently, large-displacement diesel engines often utilize compressor housings that are bulky and thin (4-5mm) in thickness. Producing these thin-walled, large compressor housing parts using gravity casting is challenging. Compressor housings with multiple slots (e.g., three slots) require sand core molding due to the relatively thin and deep slots at the intake manifold. During casting, sand cores are typically placed from top to bottom. Since low-pressure casting molds are ejected from the top, the upper mold of the low-pressure mold cannot be penetrated, making it impossible to insert the intake manifold sand core. Therefore, conventionally, compressor housing castings with three slots at the intake manifold can only be produced using gravity casting.

[0003] A published Chinese patent, with publication number CN112872329B, discloses a low-pressure casting mold for a compressor casing. The mold comprises an upper mold and a lower mold. An insert is disposed within the upper mold, extending into a receiving cavity within the upper mold. A gap is formed between the inner wall of the receiving cavity and the outer wall of the insert. The gap is used to accommodate an intake manifold sand core inserted from the bottom of the upper mold and slotted with the insert. The insert is provided with at least one first locking portion on its outer wall, and the intake manifold sand core is provided with at least one second locking portion. The first and second locking portions cooperate to lock the intake manifold sand core securely to the insert. This invention enables the intake manifold sand core to be loaded from the bottom of the upper mold and slotted and locked with the insert, making it possible to cast the compressor casing using a low-pressure casting process. This leverages the advantages of the low-pressure casting process to improve the compressor casing yield and reduce the scrap rate.

[0004] The above public solution has the following deficiencies: 1. There is a rotational margin between the exhaust pipe sand core and the insert, which fails to achieve effective locking. The exhaust pipe sand core is easily offset during the casting process, resulting in dimensional deviation or molding defects in the casting. Although the solution is equipped with an inspection groove, even if dimensional deviation or molding defects are detected in the already cast compressor casing, they cannot be remedied, increasing manufacturing costs.

[0005] 2. When demolding, the exhaust pipe sand core needs to be peeled off together with the upper mold. At this time, the casting has just been formed, and the exhaust pipe sand core has a high adhesion to the casting, making it difficult to peel off. In addition, since the exhaust pipe part of the casting is relatively weak and is affected by thermal expansion and contraction, the exhaust pipe part of the casting is prone to excessive contraction after the exhaust pipe sand core is peeled off, causing deformation or damage to the casting.

[0006] 3. The existing inspection groove is set at the upper end of the sand core. The inspection boss needs to be knocked out manually after forming, which wastes work time and may damage the casting surface. Summary of the Invention

[0007] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a compressor casing casting mold, by arranging a first slot on the T-shaped insert and a second slot on the exhaust pipe sand core, which are used in conjunction with a clamping column. The clamping column can simultaneously penetrate the exhaust pipe sand core and the T-shaped insert from the outside, and rigidly and effectively lock the exhaust pipe sand core and the T-shaped insert, thereby avoiding the displacement of the exhaust pipe sand core during the casting process and improving the molding quality of the casting; both ends of the clamping column pass through the upper mold, and the convex seat provided at one end of the clamping column and the U-shaped seat provided at the side end of the upper mold can be rotatably matched, so that the installation of the clamping column can be quickly determined. After the casting is completed, the convex seat can be rotated to disengage from the U-shaped seat to pull out the clamping column, thereby separating the insert and the exhaust pipe sand core in the mold closing state. When demolding, only the upper mold and the lower mold need to be separated, and the exhaust pipe sand core is taken out with the casting. After cooling and shaping, it is peeled off, which effectively reduces the adhesion and deformation between the casting and the exhaust pipe sand core and improves the yield rate of the casting after molding; the present invention arranges an inspection groove in the annular groove at the lower end of the T-shaped insert, so that the inspection boss is formed in the stamping area of ​​the casting, and can be directly removed by subsequent stamping processing without the need for additional steps, saving manpower and protecting the integrity of the casting; it is used to solve the problem in the prior art that there is a rotational margin between the exhaust pipe sand core and the insert, which fails to achieve effective locking, and the exhaust pipe sand core is easily offset during the casting process, resulting in dimensional deviation or molding defects of the casting, and the exhaust pipe sand core needs to be peeled off together with the upper mold during demoulding, which is difficult to peel off and the casting is easily deformed or damaged; the inspection boss is formed in the non-stamping area of ​​the casting and needs to be manually knocked off after inspection, which wastes work time and may damage the surface of the casting.

[0008] To achieve the above-mentioned and other related purposes, the present invention provides a compressor casing casting mold, comprising a base, a lower mold mounted on the base, and an upper mold fitted on the lower mold, wherein a mold cavity is formed between the upper and lower molds, and an exhaust pipe sand core and a flow channel sand core are fitted in the mold cavity; The upper mold is provided with a T-shaped insert, and the central area of ​​the T-shaped insert is provided with an exhaust hole connected to the mold cavity; the exhaust pipe sand core is sleeved on the outside of the T-shaped insert, and a first annular gap for forming the outer ring of the compressor case exhaust pipe is provided between the outer end of the exhaust pipe sand core and the upper mold, and a second annular gap for forming the inner ring of the compressor case exhaust pipe is provided between the outer end of the T-shaped insert and the inner end of the exhaust pipe sand core; A first slot is provided on one side of the T-shaped insert; The exhaust pipe sand core is provided with a second slot on the same side as the first slot of the T-shaped insert, and a clamping column is matched in both the first slot and the second slot.

[0009] In one embodiment of the present invention, both ends of the clamping column completely pass through the upper mold, one end of the clamping column is provided with a convex seat, and the outer end of the upper mold is provided with a U-shaped seat, and the convex seat can be rotatably clamped into the U-shaped seat.

[0010] In one embodiment of the present invention, an annular groove is provided at the lower end of the T-shaped insert, and the annular groove and the second annular gap are used to form the stamping area of ​​the compressor case; at least two inspection grooves are provided in the annular groove, which are used to form an inspection boss in the stamping area of ​​the compressor case.

[0011] In one embodiment of the present invention, a concave surface is provided on an upper end of one side of the upper mold corresponding to the first card slot and the second card slot, and both the first card slot and the second card slot are connected to the concave surface.

[0012] In one embodiment of the present invention, the upper end of the upper mold is provided with a groove adapted to the upper end of the T-shaped insert. In the assembled state, the upper end of the T-shaped insert is higher than the groove, and rectangular notches are provided on both sides of the upper end of the T-shaped insert higher than the groove.

[0013] In one embodiment of the present invention, the cross-section of the first card slot is a rounded rectangle, the cross-section of the second card slot is a semicircular, the rounded end cross-section of the second card slot is concentric with the semicircular cross-section of the first card slot and has the same radius; in the assembled state, there is a hole spacing between the card column and the rectangular end cross-section of the first card slot.

[0014] In one embodiment of the present invention, a low-pressure pouring channel connected to the cavity is opened at the lower end of the lower mold, and the low-pressure pouring channel is configured as an hourglass-shaped structure with a diameter gradually decreasing from the upper and lower ends to the middle.

[0015] In one embodiment of the present invention, a ceramic filter is installed in the middle area of ​​the low-pressure pouring channel, and the pore size of the ceramic filter is 1-2 mm.

[0016] In one embodiment of the present invention, a baffle is provided at the lower end of the cavity, and the lower end of the runner sand core is fixed on the baffle; a through hole connected to the low-pressure pouring channel is opened in the center of the baffle.

[0017] In one embodiment of the present invention, rectangular notches are provided on the left and right side ends of the upper mold and the lower mold, a mold closing positioning groove is provided in the rectangular notch of the upper mold, and a mold closing positioning convex portion is provided in the rectangular notch of the lower mold, and the mold closing positioning groove and the mold closing positioning convex portion are matched with each other to position the mold closing position of the upper mold relative to the lower mold.

[0018] As described above, the compressor casing casting mold of the present invention has the following beneficial effects: 1. The present invention provides a first clamping groove on the T-shaped insert and a second clamping groove on the exhaust pipe sand core, which are used in conjunction with a clamping column. The clamping column can simultaneously penetrate the exhaust pipe sand core and the T-shaped insert from the outside, rigidly and effectively locking the exhaust pipe sand core and the T-shaped insert, thereby avoiding displacement of the exhaust pipe sand core during the casting process and improving the molding quality of the casting.

[0019] 2. Both ends of the clamping column pass through the upper mold. The convex seat at one end of the clamping column and the U-shaped seat at the side end of the upper mold can be rotatably matched to quickly determine the installation of the clamping column. After the casting is completed, the clamping column can be pulled out by rotating the convex seat to disengage the U-shaped seat, thereby separating the insert and the exhaust pipe sand core in the mold closing state. When demolding, only the upper mold and the lower mold need to be separated. The exhaust pipe sand core is taken out with the casting and then cooled and shaped before being peeled off, which effectively reduces the adhesion and deformation between the casting and the exhaust pipe sand core and improves the yield rate of the casting after molding.

[0020] 3. A hole spacing is reserved between the rounded rectangular cross-section of the first slot and the semicircular cross-section of the second slot. When the material expands too much during the casting process and squeezes the exhaust pipe sand core upward, the hole spacing can provide a margin for the upper end of the clamping column to avoid deformation and damage to the clamping column or the exhaust pipe sand core.

[0021] 4. The present invention provides an inspection groove in the annular groove at the lower end of the T-shaped insert, so that the inspection boss is formed in the stamping area of ​​the casting. It can be directly removed in the subsequent stamping process without the need for additional steps, saving manpower and protecting the integrity of the casting.

[0022] 5. The present invention provides an hourglass-shaped low-pressure pouring channel combined with a ceramic filter, which can effectively optimize the flow path of the molten metal and filter out slag inclusions, thereby improving the internal quality of the casting; the low-pressure pouring channel cooperates with the baffle through hole to ensure that the runner sand core is stably fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic diagram of the overall structure of the compressor casing casting mold disclosed in the present invention.

[0024] Figure 2 Shown is a schematic diagram of the overall structure of the compressor casing casting mold disclosed in the present invention from another perspective.

[0025] Figure 3 Shown is a schematic cross-sectional structure diagram of the compressor casing casting mold disclosed in the present invention.

[0026] Figure 4 Display as Figure 3 Schematic diagram of a hole spacing between the first card slot and the card column.

[0027] Figure 5 Shown is a schematic diagram of the external structure of the upper mold in the compressor casing casting mold disclosed in the present invention.

[0028] Figure 6 Shown is a schematic diagram of the internal structure of the upper mold in the compressor casing casting mold disclosed in the present invention.

[0029] Figure 7 Shown is a schematic diagram of the internal structure of the lower mold in the compressor casing casting mold disclosed in the present invention.

[0030] Figure 8 Shown is an enlarged structural schematic diagram of a T-shaped insert in the compressor casing casting mold disclosed in the present invention.

[0031] Figure 9 It shows an enlarged structural schematic diagram of the cooperation among the T-shaped insert, the exhaust pipe sand core and the clamping column in the compressor casing casting mold disclosed in the present invention.

[0032] Figure 10 Display as Figure 9 Schematic diagram of the decomposition structure.

[0033] Component number description Base 1; lower mold 2; low-pressure pouring channel 21; mold positioning convex portion 22; upper mold 3; concave surface 31; groove 32; mold positioning groove 33; mold cavity 4; exhaust pipe sand core 5; second clamping groove 51; runner sand core 6; T-shaped insert 7; first clamping groove 71; rectangular notch 72; exhaust hole 73; annular groove 74; inspection groove 75; clamping column 8; protrusion 9; U-shaped seat 10; ceramic filter 11; baffle 12. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0035] See also Figures 1 to 10 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0036] See also Figure 1-Figure 3 、 Figure 5-Figure 7The present invention provides a compressor casing casting mold, comprising a base 1, a lower mold 2 mounted on the base 1, and an upper mold 3 fitted on the lower mold 2, a mold cavity 4 is formed between the upper mold 3 and the lower mold 2, and an exhaust pipe sand core 5 and a runner sand core 6 are fitted in the mold cavity 4; the left and right side ends of the upper mold 3 and the lower mold 2 are both provided with rectangular notches, a mold closing positioning groove 33 is provided in the rectangular notch of the upper mold 3, and a mold closing positioning convex portion 22 is provided in the rectangular notch of the lower mold 2, and the mold closing position of the upper mold 3 relative to the lower mold 2 is positioned by the concave-convex cooperation between the mold closing positioning groove 33 and the mold closing positioning convex portion 22, thereby effectively ensuring the accuracy of the mold closing position, reducing the risk of mold misalignment, and further improving the dimensional consistency of the casting.

[0037] See also Figure 3 The lower end of the lower mold 2 is provided with a low-pressure pouring channel 21 connected to the mold cavity 4. The low-pressure pouring channel 21 is configured as an hourglass-shaped structure with a diameter gradually decreasing from the upper and lower ends to the middle. The design of the hourglass-shaped pouring channel allows the molten metal to fill the mold from bottom to top, with a low flow rate, a smooth filling process, and reduced scouring force and metal oxidation. The hourglass-shaped design helps prevent impurities and slag in the pouring system from entering the mold cavity, ensuring the quality of the casting. The smooth filling reduces splashing, oxidation, and air entrainment, thereby reducing the occurrence of defects such as sand holes, iron pods, air holes, and oxidized inclusions. A ceramic filter 11 is installed in the middle area of ​​the low-pressure pouring channel 21. The pore size of the ceramic filter 11 is 1-2mm. The ceramic filter 11 can effectively remove inclusions and gas from the molten metal, reduce air holes inside and outside the casting, reduce surface defects, and significantly improve the yield rate of the casting. The ceramic filter 11 has extremely high high-temperature resistance and can meet the requirements of compressor casing casting. A baffle 12 is provided at the lower end of the mold cavity 4, and the lower end of the runner sand core 6 is fixed on the baffle 12; a through hole connected to the low-pressure pouring channel 21 is opened in the center of the baffle 12; the upper end of the baffle 12 is coated with a KNM1000 high-temperature resistant anti-oxidation coating. The KNM1000 high-temperature resistant anti-oxidation coating is a nano-ceramic polymer coating that can improve the workpiece's resistance to high-temperature oxidation and slow down decarburization; the coating will not fall off or crack during the heating process, and will not contaminate the fire cooling medium, will not corrode the casting, and facilitates rapid demolding of the casting. The present invention can effectively optimize the flow path of the molten metal and filter slag inclusions, thereby improving the internal quality of the casting by providing an hourglass-shaped low-pressure pouring channel 21 in combination with a ceramic filter screen 11; the low-pressure pouring channel 21 cooperates with the through hole of the baffle 12 to ensure that the runner sand core 6 is stably fixed.

[0038] See also Figure 8A T-shaped insert 7 is provided in the upper mold 1, and an exhaust hole 73 connected to the mold cavity 4 is provided in the central area of ​​the T-shaped insert 7; the exhaust pipe sand core 5 is sleeved on the outside of the T-shaped insert 7, and a first annular gap for forming the outer ring of the compressor casing exhaust pipe is provided between the outer end of the exhaust pipe sand core 5 and the upper mold 3; a second annular gap for forming the inner ring of the compressor casing exhaust pipe is provided between the outer end of the T-shaped insert 7 and the inner end of the exhaust pipe sand core 5.

[0039] See also Figure 3 , Figures 8-10 A first slot 71 is provided on one side of the T-shaped insert 7; a second slot 51 is provided on the same side of the exhaust pipe sand core 5 as the first slot 71 of the T-shaped insert 7, and a clamping column 8 is provided in both the first slot 71 and the second slot 51; a concave surface 31 is provided on the upper end of the side of the upper mold 3 corresponding to the first slot 71 and the second slot 51, and both the first slot 71 and the second slot 51 are connected to the concave surface 31. The present invention provides the first slot 71 on the T-shaped insert 7 and the second slot 51 on the exhaust pipe sand core 5, and uses a clamping column 8. The clamping column 8 can simultaneously penetrate the exhaust pipe sand core 5 and the T-shaped insert 7 from the outside, effectively and rigidly locking the exhaust pipe sand core 5 and the T-shaped insert 7, preventing the exhaust pipe sand core 5 from shifting during the casting process and improving the molding quality of the casting.

[0040] See also Figure 4 The cross-section of the first slot 71 is a rounded rectangle, and the cross-section of the second slot 51 is a semicircular. The rounded end cross-section of the second slot 51 is concentric with the semicircular cross-section of the first slot 71 and has the same radius; the rounded end cross-section of the first slot 71 is arranged horizontally, and the semicircular cross-section of the second slot 51 is arranged longitudinally; in the assembled state, there is a hole spacing between the clamping column 8 and the rectangular end cross-section of the first slot 71, and correspondingly, there is also a hole spacing between the upper end of the exhaust pipe sand core 5 and the T-shaped insert 7; when the material expands too much during the casting process and squeezes the exhaust pipe sand core 5 upward, the hole spacing can provide upward activity margin for the clamping column 8 and the upper end of the exhaust pipe sand core 5 to avoid deformation and damage to the clamping column 8 or the exhaust pipe sand core 5.

[0041] The upper end of the upper mold 3 is provided with a groove 32 that is compatible with the upper end of the T-shaped insert 7. In the assembled state, the upper end of the T-shaped insert 7 is higher than the groove 32, and rectangular notches 72 are provided on both sides of the upper end of the T-shaped insert 7 higher than the groove, which is convenient for using tools to remove the T-shaped insert 7 from the upper mold 3 for inspection and maintenance.

[0042] See also Figure 2The two ends of the clamping column 8 completely pass through the upper mold 3, and one end of the clamping column 8 is provided with a convex seat 9, and the outer end of the upper mold 3 is provided with a U-shaped seat 10, which can be rotatably inserted into the U-shaped seat 10; the convex seat 9 provided at one end of the clamping column 8 and the U-shaped seat 10 provided at the side end of the upper mold 3 can be rotatably matched, which can quickly lock the installation of the clamping column 8. After the casting is completed, the convex seat 9 is rotated to disengage the U-shaped seat 10 to pull out the clamping column 8 from the outside, thereby separating the T-shaped insert 7 and the exhaust pipe sand core 5 in the mold closing state. When demolding, only the upper mold 3 and the lower mold 2 need to be separated. The exhaust pipe sand core 5 is taken out with the casting and then cooled and shaped before being peeled off, effectively reducing the adhesion and deformation between the casting and the exhaust pipe sand core 5, and improving the yield rate of the casting after molding.

[0043] An annular groove 74 is provided at the lower end of the T-shaped insert 7, and a stamping area of ​​the compressor case is formed between the annular groove 74 and the second annular gap; at least two inspection grooves 75 are provided in the annular groove 74, which are used to form an inspection boss in the stamping area of ​​the compressor case. The staff can detect the molding quality of the casting through the inspection boss and directly remove the inspection boss in the subsequent stamping process without the need for additional steps, saving manpower and protecting the integrity of the casting.

[0044] The working process of the present invention is as follows: the T-shaped insert 7 is installed on the upper mold 3 from top to bottom, the exhaust pipe sand core 5 is sleeved on the T-shaped insert 7 from bottom to top so that the second groove 51 coincides with the first groove 71, the clamping column 8 is inserted from the outside, and the clamping column 8 falls into the second groove 51 and the first groove 71. The exhaust pipe sand core 5 is fixed by pressing down with its own weight, and the clamping column 8 is rotated so that the protrusion 9 is clamped into the U-shaped seat 10, and the clamping column 8 is fixed; the assembled upper mold 3 is closed relative to the lower mold 2. After the mold is closed, the molten metal is cast from the low-pressure pouring channel 21 from bottom to top under low pressure, and the slag is filtered out by the ceramic filter 11. Due to the obstruction of the runner sand core 6 and the baffle 12, the molten metal flows into the mold cavity 4 after passing through the through hole of the baffle 12, and bypasses the runner sand core 6 to gradually fill the edge of the mold cavity 4 until the mold cavity 4 and the first annular gap, the second annular gap, the annular groove 74, and the inspection groove 75 are filled. The casting is completed. The mold cavity 4 can form the main body of the compressor case, the first annular gap can form the outer ring of the compressor case, the second annular gap can form the inner ring of the compressor case, and the annular groove 74 can form a circular convex ring. Cooperating with the inner ring of the compressor case can limit the stamping position of the casting; the inspection groove 75 can form an inspection boss, and the staff can inspect the molding quality of the compressor case through the inspection boss; after the compressor case is formed, the boss 9 is rotated to disengage from the U-shaped seat 10, and the clamping column 8 is pulled out from the outside, the exhaust pipe sand core 5 is separated from the T-shaped insert 7, and the upper mold 3 is grabbed by a lifting device to open the mold. At this time, the exhaust pipe sand core 5 is adhered to the upper end of the compressor case, so it will not fall off; the exhaust pipe sand core 5 is taken out with the casting, further cooled and shaped, and then peeled off. In this process, another exhaust pipe sand core 5 is assembled with the T-shaped insert 7 and casting can be continued.

[0045] In summary, the present invention, by providing the clamping column 8 and cooperating with the first clamping groove 71 and the second clamping groove 51, can achieve reliable fixation of the exhaust pipe sand core 5 relative to the T-shaped insert 7, avoiding casting deviation. The reserved hole spacing between the first clamping groove 71 and the clamping column 8 can compensate for the thermal expansion and contraction effects of casting, preventing structural deformation and damage. The clamping column 8 is quickly removable, and the exhaust pipe sand core 5 is removed as a whole with the casting during demolding and separated after cooling, reducing the risk of adhesion and protecting the integrity of the thin-walled structure. The inspection groove 75 is integrated into the annular groove 74 of the T-shaped insert 7. The formed inspection boss can be removed simultaneously during the stamping of the casting, eliminating the manual knocking step, improving efficiency and avoiding surface damage. The hourglass-shaped low-pressure pouring channel 21 combined with the ceramic filter 11 can accurately control the flow path of the molten metal, effectively intercept slag inclusions, and improve the density and internal quality of the casting. Through structural innovation and improvement, the present invention systematically solves the core problems of easy deviation of the exhaust pipe sand core 5 and demolding adhesion damage, significantly improving the qualification rate and production efficiency of compressor case castings, and has outstanding practicality and industrial promotion value. Therefore, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A compressor casing casting mold, comprising a base (1), a lower mold (2) mounted on the base (1), and an upper mold (3) fitted on the lower mold (2); a mold cavity (4) is formed between the upper mold (3) and the lower mold (2); an exhaust pipe sand core (5) and a flow channel sand core (6) are fitted in the mold cavity (4); Its characteristics are: The upper mold (1) is provided with a T-shaped insert (7), and the central area of ​​the T-shaped insert (7) is provided with an exhaust hole (73) connected to the mold cavity (4); the exhaust pipe sand core (5) is sleeved on the outside of the T-shaped insert (7), and there is a first annular gap for forming the outer ring of the compressor case exhaust pipe between the outer end of the exhaust pipe sand core (5) and the upper mold (3), and there is a second annular gap for forming the inner ring of the compressor case exhaust pipe between the outer end of the T-shaped insert (7) and the inner end of the exhaust pipe sand core (5); A first slot (71) is provided on one side of the T-shaped insert (7); A second clamping groove (51) is provided on the same side of the exhaust pipe sand core (5) as the first clamping groove (71) of the T-shaped insert (7), and a clamping column (8) is fitted in both the first clamping groove (71) and the second clamping groove (51).

2. The compressor casing casting mold according to claim 1, characterized in that: Both ends of the clamping column (8) completely penetrate the upper mold (3), one end of the clamping column (8) is provided with a convex seat (9), the outer end of the upper mold (3) is provided with a U-shaped seat (10), and the convex seat (9) can be rotatably clamped into the U-shaped seat (10).

3. The compressor casing casting mold according to claim 1, characterized in that: The lower end of the T-shaped insert (7) is provided with an annular groove (74), and a stamping area of ​​the compressor casing is formed between the annular groove (74) and the second annular gap; at least two inspection grooves (75) are provided in the annular groove (74) for forming an inspection boss in the stamping area of ​​the compressor casing.

4. The compressor casing casting mold according to claim 1, characterized in that: A concave surface (31) is provided at the upper end of one side of the upper die (3) corresponding to the first card slot (71) and the second card slot (51), and both the first card slot (71) and the second card slot (51) are in communication with the concave surface (31).

5. The compressor casing casting mold according to claim 4, characterized in that: The upper end of the upper mold (3) is provided with a groove (32) adapted to the upper end of the T-shaped insert (7). In the assembled state, the upper end of the T-shaped insert (7) is higher than the groove (32), and rectangular notches (72) are provided on both sides of the upper end of the T-shaped insert (7) higher than the groove.

6. The compressor casing casting mold according to claim 1, characterized in that: The cross section of the first card slot (71) is a rounded rectangle, the cross section of the second card slot (51) is a semicircle, the rounded end cross section of the second card slot (51) is concentric with the semicircular cross section of the first card slot (71) and has the same radius; in the assembled state, there is a hole spacing between the card column (8) and the rectangular end cross section of the first card slot (71).

7. The compressor casing casting mold according to claim 1, characterized in that: A low-pressure pouring channel (21) connected to the mold cavity (4) is provided at the lower end of the lower mold (2). The low-pressure pouring channel (21) is configured as an hourglass-shaped structure with a diameter gradually decreasing from the upper and lower ends to the middle.

8. The compressor casing casting mold according to claim 7, characterized in that: A ceramic filter screen (11) is installed in the middle area of ​​the low-pressure pouring channel (21), and the pore size of the ceramic filter screen (11) is 1-2 mm.

9. The compressor casing casting mold according to claim 8, characterized in that: A baffle (12) is provided at the lower end of the mold cavity (4), and the lower end of the flow channel sand core (6) is fixed on the baffle (12); a through hole connected to the low-pressure pouring channel (21) is opened at the center of the baffle (12).

10. The compressor casing casting mold according to claim 1, characterized in that: The left and right side ends of the upper mold (3) and the lower mold (2) are both provided with rectangular notches, a mold closing positioning groove (33) is provided in the rectangular notch of the upper mold (3), and a mold closing positioning convex portion (22) is provided in the rectangular notch of the lower mold (2), and the mold closing position of the upper mold (3) relative to the lower mold (2) is positioned by the mold closing positioning groove (33) and the mold closing positioning convex portion (22) being matched in a concave-convex manner.

Images