Pouring system for lower casing casting of engine
By designing structures such as a central gating gate, multiple runners, and exhaust channels, sequential solidification and feeding of the engine lower casing casting were achieved, solving the casting problems of thick and thin-walled parts and improving the quality and yield of the casting.
Patent Information
- Application Number
- CN202520264076.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-18
AI Technical Summary
In the existing technology, it is difficult to meet the casting requirements of both the thick and thin-walled parts of the engine lower casing casting at the same time. This can easily lead to defects such as uneven solidification, deformation caused by thermal stress, porosity, looseness and shrinkage cavities, resulting in a low yield.
A gating system for an engine lower casing casting was designed, employing a central gating gate, multiple radial and transverse runners, venting grooves, transition oil passages, and chills to achieve sequential solidification and feeding of the casting, ensuring the filling effect for both thick and thin-walled sections.
It improves the quality of castings, reduces alloy waste, lowers the risk of incomplete filling and porosity, enhances the filling rate of thin-walled sections, reduces thermal stress deformation, and increases the yield.
Smart Images
Figure CN223733790U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a pouring system, especially to a pouring system of engine lower machine case casting belongs to magnesium alloy pouring technical field. BACKGROUND
[0002] Magnesium alloy casting usually adopts sand casting, pours magnesium alloy liquid into sand mold cavity which is suitable for the shape of the part, and obtains the blank or the part after it cools and solidifies. A large amount of heat radiation is generated during casting, and a large amount of water vapor is generated after the heat radiation reacts with the cold air in the sand mold. The gas needs to be quickly discharged from the sand mold, and a riser is usually arranged at the highest part of the casting to exhaust and feed.
[0003] The engine lower machine case casting comprises a machine case base with a center low and a periphery high, two split side wall mounting seats vertically upward connected to one end of the machine case base, and an integral side wall mounting seat vertically upward connected to the other end of the machine case base. A base center hole is arranged at the center of the machine case base, and four base mounting holes are symmetrically arranged around the base center hole. The upper end surface of the four base mounting hole regions is a slope with a high periphery and a low center, the base center hole is the lowest part of the machine case base, the machine case base as a whole is thick, and it is difficult to feed and solidify, especially the four base mounting hole regions solidify more slowly.
[0004] The side wall mounting seats on both sides are mainly thin-walled. Because the magnesium alloy has poor fluidity and small density, it is difficult to pour and form the thin-walled parts, the solidification speed is too fast, and casting defects such as pores, porosity, inclusions, and insufficient pouring are prone to occur, resulting in a low yield. In addition, a large difference in solidification time of the metal liquid will cause thermal stress of the casting after solidification, resulting in deformation, cracks, and defects such as shrinkage holes and shrinkage porosity. SUMMARY
[0005] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.
[0006] In view of the above and / or problems existing in the prior art, the utility model is proposed.
[0007] The utility model aims to overcome the problems existing in the prior art, provide a pouring system of engine lower machine case casting, which can simultaneously meet the pouring requirements of thick and thin parts, realize sequential solidification of the casting, reliable feeding and avoidance of insufficient pouring, and improve the quality of the casting.
[0008] The utility model discloses a kind of pouring systems of engine lower machine case castings, the engine lower machine case includes the machine case pedestal of center low four around high, one end of the machine case pedestal is connected with two upward vertical split sidewall mounting seat, the other end of the machine case pedestal is connected with upward vertical integral sidewall mounting seat;The center of the machine case pedestal is equipped with pedestal center hole, four pedestal mounting holes are symmetrically equipped around pedestal center hole;The lower of the pedestal center hole is equipped with the center sprue coaxial with it, the outer periphery of the center sprue is connected with multiple bottom radial gates extending radially outward, the part between adjacent bottom radial gates close outer end head is connected respectively by horizontal gate, each horizontal gate forms annular below the machine case pedestal and is connected with the bottom of the machine case pedestal by multiple inner gates;The center of four pedestal mounting holes is equipped with vertical gate extending along its axis respectively, the lower end of each vertical gate is connected with corresponding horizontal gate respectively, the upper end of each vertical gate is higher than the highest point of the machine case pedestal, the middle section of each vertical gate is connected with the circumferential wall of pedestal mounting hole by multiple radial short gates;The outer side of split sidewall mounting seat and integral sidewall mounting seat is equipped with upward extending through cylinder respectively, the lower end of each through cylinder is connected with horizontal gate by inclined gate respectively, the inner side wall of both sides through cylinder is connected with split sidewall mounting seat and integral sidewall mounting seat by inner gate respectively.
[0009] Further, the through cylinder is equipped with two or three on the outer side of the integral sidewall mounting seat.
[0010] Further, the inner circumferential wall of the pedestal center hole is connected with center riser pedestal by multiple center hole radial channels, the top center of the center riser pedestal is equipped with upward extending center riser.
[0011] Further, the circumferential wall top of the pedestal center hole is uniformly distributed with multiple upward extending exhaust grooves.
[0012] Further, the top of split sidewall mounting seat and integral sidewall mounting seat is equipped with multiple upward extending open risers respectively, the top of each open riser is connected with the top of corresponding through cylinder transversely.
[0013] Further, the inner side wall root of the integral sidewall mounting seat is connected with the top of the machine case pedestal by oil passage bridge, the transition oil hole is equipped in the oil passage bridge, the lubricating oil hole of integral sidewall mounting seat and machine case pedestal is connected at both ends of the transition oil hole;The top of the oil passage bridge is equipped with blind riser.
[0014] Further, the process reinforcing bar connecting integral sidewall mounting seat and machine case pedestal is respectively equipped on both sides of the oil passage bridge.
[0015] Further, the outer wall of the machine case pedestal is equipped with boss, the inclined gate is connected with the boss by point-like gate.
[0016] Further, the thick hot spot positions of the casing base, the split side wall mounting seat and the integral side wall mounting seat are respectively placed with chills.
[0017] Compared with the prior art, the utility model has the following beneficial effects: 1, the casing base is thick, a plurality of cross gates and ingates are arranged to directly perform mold filling, the lowest distance between the center hole position of the base and the center ingate is too close, mold filling is performed from the outer periphery to the center, the circumferential wall of the center hole of the base is connected with the center riser through the radial flow channel of the center hole, the sectional area of the center riser can be reduced, and the waste of alloy liquid can be reduced, and the exhaust groove that is uniformly distributed along the upper side of the circumferential wall of the center hole of the base plays a role of slag collection and exhaust;
[0018] 2, the thin wall of the oil passage bridge is provided with a blind riser above, plays a role of feeding and exhaust, reduces the risk of gas hole caused by the oil passage, and simultaneously, process reinforcing ribs are arranged on both sides of the oil passage bridge, deformation caused by thermal stress in the casting process is reduced, and the smoothness of the oil passage and the smoothness of the inner wall are ensured;
[0019] 3, the split side wall mounting seat and the integral side wall mounting seat directly perform mold filling through the cylinder gap, the mold filling rate of the thin wall is improved, and the thin wall area is prevented from solidifying too fast to cause pouring deficiency; the point-shaped ingate feeds the local hot spot such as the boss, and the temperature distribution and solidification sequence of the casting are adjusted;
[0020] 4, the whole casting pouring system realizes sequential solidification, fully plays a role of riser feeding, reduces the formation of porosity and shrinkage, and improves the internal quality of the casting; simultaneously, a chill process is arranged, the feeding capacity of the hot spot position is improved, and the formation of porosity and shrinkage is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating creative labor, the drawings are only provided for reference and illustration, not to limit the utility model. Among them:
[0022] Figure 1 It is the structure schematic view of the engine lower casing casting in the utility model;
[0023] Figure 2 It is the perspective view of the pouring system of the utility model;
[0024] Figure 3 It is the bottom view of the pouring system of the utility model;
[0025] Figure 4 It is the structure view after pouring of the utility model;
[0026] Figure 5 The layout of the cold iron in the utility model;
[0027] In the figure: engine lower case casting: 1a. Case base; 1a1. Base center hole; 1a2. Base mounting hole; 1a3. Boss; 1b. Split type side wall mounting seat; 1c. Integral type side wall mounting seat; 1d. Oil passage bridge;
[0028] 2. Center gate; 3. Bottom radial runner; 4. Cross runner; 5. In-gate; 6. Vertical runner; 7. Radial short runner; 8. Inclined runner; 9. Over cylinder; 10. Point-like gate; 11. Center hole radial runner; 12. Center riser; 13. Exhaust groove; 14. Open riser; 15. Hidden riser; 16. Process tie bar; 17. Cold iron. DETAILED DESCRIPTION
[0029] In the following description of the utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a particular orientation.
[0030] In order to make the technical means, creative features, purposes and effects achieved by the utility model easy to understand, the utility model is further described below in combination with specific drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all.
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.
[0032] As Figures 1 to 5 As shown in the utility model, the engine lower case includes a case base 1a with a low center and high periphery, one end of the case base 1a is connected with two upward vertical split type side wall mounting seats 1b, the other end of the case base 1a is connected with an upward vertical integral type side wall mounting seat 1c, and the split type side wall mounting seat 1b and the integral type side wall mounting seat 1c are mainly thin-walled. The center of the case base 1a is provided with a base center hole 1a1, four base mounting holes 1a2 are symmetrically arranged around the base center hole 1a1, the upper end face of the four base mounting hole regions is an inclined surface with a high outer periphery and a low middle, the base center hole 1a1 is the lowest part of the case base 1a, and the case base 1a as a whole is thick.
[0033] The lower part of the base center hole 1a1 is provided with a center gate 2 coaxial with the base center hole 1a1, the outer periphery of the center gate 2 is connected with a plurality of bottom radial gates 3 extending radially outward, the adjacent bottom radial gates 3 are connected with each other through a cross gate 4 near the outer end, and each cross gate 4 forms a ring below the machine case base 1a and is connected with the bottom of the machine case base 1a through a plurality of inner gates 5; the center of each of the four base mounting holes 1a2 is provided with a vertical gate 6 extending along the axis thereof, the lower end of each vertical gate 6 is connected with the corresponding cross gate 4, and the middle section of each vertical gate 6 is connected with the circumferential wall of the base mounting hole 1a2 through a plurality of radial short gates 7.
[0034] The inner circumferential wall of the base center hole 1a1 is connected with a center riser base through a plurality of center hole radial flow channels 11, the top center of the center riser base is provided with a center riser 12 extending upward, so that the diameter of the center riser 12 is only a fraction of the inner diameter of the base center hole 1a1, thereby reducing the waste of alloy liquid.
[0035] The magnesium alloy liquid enters from the center gate 2, then flows radially outward along each bottom radial gate 3, enters each section of the cross gate 4, and then flows upward through the plurality of inner gates 5 on the cross gate 4 to fill the cavity of the machine case base 1a from bottom to top. Since the thickness of the four base mounting holes 1a2 far from the center of the base is the thickest, the magnesium alloy liquid also rises along the four vertical gates 6, and then fills the hole wall of each base mounting hole 1a2 through each radial short gate 7. The radial short gate 7 in each base mounting hole 1a2 can be provided with two or more, and the end of each radial short gate 7 is connected with the highest point of the hole wall of the base mounting hole 1a2.
[0036] The upper end of each vertical gate 6 is higher than the highest point of the machine case base 1a, which can perform feeding for the peripheral area of each base mounting hole 1a2.
[0037] The magnesium alloy liquid entering the machine case base cavity flows from the periphery to the center to fill the hole wall of the base center hole 1a1, then enters the center riser base through each center hole radial flow channel 11, and then continues to flow upward into the center riser 12 to perform feeding for the central area of the machine case base 1a through the center riser 12.
[0038] The circumferential wall of the base center hole 1a1 is uniformly distributed with a plurality of upward extending exhaust grooves 13 at the top. During the filling process, the water vapor generated by the reaction of the cold air in the sand mold is discharged through each exhaust groove 13.
[0039] The outer side of the split side wall mounting seat 1b and the integral side wall mounting seat 1c is respectively provided with an upwardly extending over-pipe 9, the outer side of the integral side wall mounting seat 1c is provided with two or three over-pipes 9, the lower end of each over-pipe 9 is connected with the horizontal runner 4 through the inclined runner 8, and the inner side wall of the two over-pipes 9 is respectively connected with the split side wall mounting seat 1b and the integral side wall mounting seat 1c through the inner gate 5.
[0040] The top of the split side wall mounting seat 1b and the integral side wall mounting seat 1c is respectively provided with a plurality of upwardly extending open risers 14, and the top of each open riser 14 is connected with the top of the corresponding over-pipe 9 transversely.
[0041] Since the split side wall mounting seat 1b and the integral side wall mounting seat 1c are mainly thin-walled, the underfilling defect is prone to occur during the sequential filling from bottom to top; therefore, the over-pipe 9 is arranged on the outer side of the side wall mounting seat, the magnesium alloy liquid reaching the horizontal runner 4 at both ends enters the over-pipe 9 upwardly and outwardly along the inclined runner 8, flows upwardly along the over-pipe 9, and then enters the cavity of the split side wall mounting seat 1b and the integral side wall mounting seat 1c through the inner gate 5 of the inner side wall of the over-pipe 9. The top of the split side wall mounting seat 1b and the integral side wall mounting seat 1c is complementarily fed through the open riser 14.
[0042] In order to reduce the external oil pipe of the engine, the inner side wall root of the integral side wall mounting seat 1c is connected with the top of the engine case base 1a through the oil passage bridge 1d, the oil passage bridge 1d is provided with a transition oil hole, and the transition oil hole is connected with the lubricating oil hole of the integral side wall mounting seat 1c and the engine case base 1a at both ends, so that the oil passage is integrated in the casting.
[0043] The top and the side wall of the oil passage bridge 1d are relatively thin, so that the dark riser 15 is arranged on the top of the oil passage bridge 1d to complementarily feed the oil passage bridge 1d. The process tie bar 16 connecting the integral side wall mounting seat 1c and the engine case base 1a is arranged on both sides of the oil passage bridge 1d to protect the oil passage bridge 1d and prevent the deformation of the casting caused by the thermal stress in the casting process.
[0044] The outer wall of the engine case base 1a is provided with the boss 1a3, and since the boss 1a3 is close to the split side wall mounting seat 1b, the boss 1a3 is connected with the point gate 10 through the inclined runner 8 to be complementarily fed through the point gate 10.
[0045] The thick and large thermal section positions of the engine case base 1a, the split side wall mounting seat 1b and the integral side wall mounting seat 1c are respectively arranged with the chill 17 to accelerate the cooling speed of the thick and large thermal section positions, make the solidification process more uniform, and reduce the stress concentration phenomenon caused by the non-synchronous solidification.
[0046] The above merely describes preferred and feasible embodiments of the present application, shows and describes the basic principles, main features and advantages of the present application, and is not intended to limit the patent protection scope of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. In addition to the above embodiments, the present application can also have other implementation manners without departing from the spirit and scope of the present application. The present application can also have various changes and improvements, and any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present application. The protection scope of the present application is defined by the appended claims and their equivalents. The technical features not described in the present application can be realized by or using the prior art, and will not be described here.
Claims
1. A gating system for an engine undercasing casting, the engine undercasing comprising a casing base with a low center and high periphery, two split side wall mounts being connected to one end of the casing base and an integral side wall mount being connected to the other end of the casing base, a base center hole being provided in the center of the casing base, four base mounting holes being symmetrically provided around the base center hole, characterized in that: a center gate coaxial with the base center hole is provided below the base center hole, a plurality of bottom radial runners extending radially outward are connected to the outer periphery of the center gate, adjacent bottom radial runners are connected by horizontal runners at the positions close to the outer ends, and the horizontal runners form a ring below the casing base and are connected to the bottom of the casing base by a plurality of inner gates; a vertical runner extending along the axis of each of the four base mounting holes is provided in the center of the base mounting hole, the lower end of each vertical runner is connected to the corresponding horizontal runner, the upper end of each vertical runner is higher than the highest point of the casing base, and the middle section of each vertical runner is connected to the circumferential wall of the base mounting hole by a plurality of radial short runners; the outer sides of the split side wall mounts and the integral side wall mount are respectively provided with upwardly extending through tubes, the lower ends of the through tubes are respectively connected to the horizontal runners by inclined runners, and the inner walls of the through tubes on both sides are respectively connected to the split side wall mounts and the integral side wall mount by inner gates. Two or three through tubes are provided on the outer side of the integral side wall mount. The inner circumferential wall of the base center hole is connected to a center riser base by a plurality of center hole radial runners, and the top center of the center riser base is provided with an upwardly extending center riser. A plurality of upwardly extending exhaust grooves are uniformly distributed on the top circumferential wall of the base center hole.
2. A gating system for an engine undercasing casting according to claim 1, characterized in that: The top portions of the split side wall mounts and the integral side wall mount are respectively provided with a plurality of upwardly extending open risers, and the top portions of the open risers are connected to the top portions of the corresponding through tubes transversely.
3. The gating system for an engine undercasing casting according to claim 1, characterized in that: The inner wall root of the integral side wall mount is connected to the top of the casing base by an oil passage bridge, a transition oil hole is provided in the oil passage bridge, the two ends of the transition oil hole are connected to the lubricating oil channels of the integral side wall mount and the casing base, and a blind riser is provided on the top of the oil passage bridge.
4. The gating system for an engine undercasing casting of claim 1, wherein: Process reinforcement connecting the integral side wall mount and the casing base is provided on both sides of the oil passage bridge.
5. The gating system for an engine undercasing casting of claim 1, wherein: A boss is provided on the outer wall of the casing base, and the inclined runner is connected to the boss by a point-like gate.
6. The gating system for an engine undercasing casting of claim 1, wherein: Cold irons are placed at the thick and large hot spots of the casing base, the split side wall mounts and the integral side wall mount.
7. A gating system for an engine undercasing casting according to claim 6, characterised in that: 8. The gating system for an engine undercasing casting of claim 1, wherein: 9. A gating system for an engine undercasing casting according to any one of claims 1 to 8, characterized in that: