Supporting seat mold for precoated sand molding

Abstract

The utility model discloses a supporting seat mold for precoated sand molding. The supporting seat mold comprises a lower mold and an upper mold corresponding to the lower mold, the key point of the utility model is as follows: the lower parting surface of the lower mold protrudes to form a plurality of lower mold cores, and a sprue nest, a lower cross gate and a plurality of riser nests which are positioned on one sides of the lower mold cores; the upper parting surface of the upper mold protrudes to form a plurality of upper mold cores, upper sprues corresponding to the sprue nests and a plurality of upper risers, riser necks connected with the upper risers and the upper mold cores are arranged between the upper risers and the upper mold cores, the upper risers are gradually reduced from the roots to the free ends of the upper risers, the diameter of the roots is D1, the diameter of the free ends is D2, D2 = 0.39-0.59 D1, and the diameter of the free ends is D1; the upper riser can guarantee a great feeding effect only with a very small safety coefficient, and the situations of shrinkage porosity and shrinkage cavity of a casting are prevented, so that the internal quality of the casting is guaranteed, and the yield of the casting is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts casting, in particular to a supporting seat mould formed by coated sand. Background Art

[0002] The support seat of a semi-trailer saddle is cast using a coated sand mold, which is then formed using a die. Existing support seat molds consist of a lower mold and an upper mold. The lower mold features a lower core, sprue pocket, lower runner, and riser pocket, while the upper mold features an upper core, upper sprue, upper runner, and upper riser. The upper core, upper sprue, upper runner, and upper riser correspond to the lower core, sprue pocket, lower runner, and riser pocket, respectively. A riser neck connects the upper riser to the upper core. However, this upper riser requires a large safety factor to ensure shrinkage compensation efficiency, and the casting (support seat) is prone to shrinkage cavitation, resulting in low yields. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a support seat mold for coated sand molding with good shrinkage compensation effect to improve the quality of castings.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A support seat mold for coated sand molding, comprising a lower mold and an upper mold corresponding to the lower mold;

[0006] The lower mold has a lower parting surface, the lower parting surface protrudes to form a plurality of lower cores and a sprue pocket, a lower runner and a plurality of riser pockets located on one side of the lower core, the lower runner is connected to the sprue pocket, and the plurality of riser pockets are connected to the lower runner and the lower core;

[0007] The upper mold has an upper parting surface corresponding to the lower parting surface, the upper parting surface protrudes to form multiple upper cores, upper sprues corresponding to the sprue sockets, and multiple upper risers, one upper core corresponds to one lower core, one upper riser corresponds to one riser socket, and a riser neck connected to the upper riser and the upper core is provided between the upper riser and the upper core, the upper riser has a root and a free end portion relative to the root away from the upper parting surface, the upper riser gradually shrinks from the root to the free end portion, the diameter of the root is D1, and the diameter of the free end portion is D2, D2=0.39~0.59D1.

[0008] Furthermore, D1=62.00±4mm, D2=30.00±4mm.

[0009] Furthermore, D1=62.00mm, D2=30.00mm.

[0010] Furthermore, the height of the upper riser is H, H=140.00~170.00mm, and the modulus of the riser neck is 6.50~9.00mm.

[0011] Furthermore, a plurality of exhaust needles protrudes from the end surface of the upper mold core away from the upper parting surface, and the plurality of exhaust needles are arranged along the length direction of the upper mold core and there are multiple rows of them.

[0012] Furthermore, the upper core has two first sides along its length direction, and in the width direction of the upper mold, two upper risers are provided between the first sides of each two adjacent upper cores close to each other, and the two upper risers are respectively located at the two ends of the first side and are respectively connected to the two first sides through the riser necks.

[0013] Furthermore, in the length direction of the upper mold, the upper straight runner is provided between the ends of the two adjacent upper cores close to each other, and the upper parting surface protrudes with an upper cross runner located on the side of the upper straight runner close to the upper riser. The upper cross runner corresponds to the lower cross runner, and one end of the upper cross runner is connected to the upper straight runner, and the other end extends between the two adjacent risers in the direction close to the upper riser. The upper parting surface is also provided with an upper reinforcement at both ends of each of the upper cores.

[0014] Furthermore, the lower parting surface is provided with a lower reinforcement at both ends of each lower core, the upper mold and the lower mold are integrally formed, the upper mold and the lower mold are arranged side by side and a partition is provided between the two, the partition extends along the length direction of the upper core to separate the upper mold and the lower mold, and the upper riser is conical.

[0015] The support seat mold of the coated sand molding of the utility model is gradually reduced from the root to the free end by setting an upper riser, and the diameter of the root is set to D1 and the diameter of the free end is set to D2, D2=0.39~0.59D1, so that the upper riser can ensure a great shrinkage compensation effect with a very small safety factor, prevent the occurrence of shrinkage porosity and shrinkage cavities in the casting, thereby ensuring the internal quality of the casting and improving the casting yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional schematic diagram of a support seat mold for coated sand molding according to an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 Front view of

[0018] Figure 3 for Figure 2 A magnified view of the local area A. DETAILED DESCRIPTION

[0019] Below, in conjunction with the accompanying drawings and specific embodiments, the utility model is further described:

[0020] like Figures 1 to 3 As shown, an embodiment of the present invention provides a support seat mold of coated sand molding, which is used to form a sand mold of a support seat of a saddle. The sand mold is used to form the support seat (casting), including a lower mold 1 and an upper mold 2 corresponding to the lower mold 1.

[0021] The lower mold 1 is used for forming the lower sand mold of the sand mold, and has a lower parting surface 11. The lower parting surface 11 protrudes upward as a whole to form a plurality of lower cores 12 and a sprue pocket 13, a lower runner 14 and a plurality of riser pockets 15 located on one side of the lower core 12. In this embodiment, there are four lower cores 12, and the four lower cores 12 are arranged in two rows, with two lower cores 12 in each row. The lower runner 14 is connected to the sprue pocket 13, and the plurality of riser pockets 15 are connected to the lower runner 14 and the lower core 12. The lower parting surface 11 is provided with a lower reinforcement 16 at both ends of each lower core 12. By providing the lower reinforcement 16, the structural strength of the sand mold can be enhanced.

[0022] The upper mold 2 is used to form the upper sand mold of the sand mold. When the upper sand mold is combined with the lower sand mold, a cavity is formed for molding the casting. The upper mold 2 has an upper parting surface 21 corresponding to the lower parting surface 11. The upper parting surface 21 integrally extends upward to form a plurality of upper cores 22, an upper sprue 23 corresponding to the sprue pockets 13, and a plurality of upper risers 24. Specifically, in the length direction of the upper mold 2, the upper straight runner 23 is provided between the ends of the two adjacent upper cores 22 that are close to each other. The upper core 22 has two first sides 222 along its length direction. The upper parting surface 21 protrudes upward with an upper cross runner 25 located on the side of the upper straight runner 23 close to the upper riser 24, and the upper cross runner 25 corresponds to the lower cross runner 14; the end surface of the upper core 22 away from the upper parting surface 21 is integrally protruding upward with a plurality of exhaust needles 221 for exhaust, and the plurality of exhaust needles 221 are arranged along the length direction of the upper core 22 and there are multiple rows of them to further prevent shrinkage holes in the casting; accordingly, there are 4 upper cores 22, and one upper core 22 corresponds to a lower core 12.

[0023] An upper riser 24 corresponds to a riser cavity 15, and a riser neck 240 connected to the upper riser 24 and the upper core 22 is provided between the upper riser 24 and the upper core 22. The upper riser 24 has a root 241 connected to the riser neck 240 and a free end 242 away from the upper parting surface 21 relative to the root 241, that is, the root 241 is the bottom and the free end 242 is the top. The upper riser 24 gradually decreases from the root 241 to the free end 242. The diameter of the root 241 is D1 and the diameter of the free end 242 is D2, wherein D1 is the bottom diameter of the upper riser 24, and D2 is the top diameter of the upper riser 24, and D2=0.39~0.59D1, so that the upper riser 24 can ensure a great shrinkage compensation effect with a very small safety factor, prevent shrinkage and shrinkage holes in the casting, thereby ensuring the internal quality of the casting and improving the casting yield.

[0024] Specifically, the upper riser 24 is tapered, and there are four of them. Accordingly, there are four riser pockets 15. D1 = 62.00 ± 4 mm, and D2 = 30.00 ± 4 mm. The values ​​of D1 and D2 not only take into account machining errors but can also be flexibly selected based on actual needs. In this embodiment, D1 = 62.00 mm, and D2 = 30.00 mm. Practice has proven that these values ​​of D1 and D2 provide optimal riser shrinkage feeding.

[0025] To further improve the feeding effect, the height of the upper riser 24 is set to H, H = 140.00-170.00 mm, where H is the distance between the flat section of the top surface of the riser neck 240 and the top surface of the upper riser 24. The specific value of H can be selected within the range of 140.00-170.00 mm according to actual needs. In this embodiment, H = 155.00 mm. Practice has shown that this value of H provides better feeding effect for the riser. To further improve the feeding effect, reduce the cutting and grinding workload of the riser neck 240, and improve the casting yield rate, the module of the riser neck 240 is set to 6.50-9.00 mm. In this embodiment, the module of the riser neck 240 is 7.75. Practice has shown that this module value of the riser neck 240 provides good feeding effect for the riser, reduces the cutting and grinding workload, and improves the casting yield rate.

[0026] To facilitate processing, in this embodiment, the upper mold 2 and lower mold 1 are integrally formed. The upper mold 2 and lower mold 1 are arranged side by side with a partition 3 integrally formed between them. The partition 3 extends along the length of the upper core 22 to separate the upper mold 2 and lower mold 1. In the width direction of the upper mold 2, two upper risers 24 are provided between the adjacent first sides 222 of each upper core 22. The two upper risers 24 are located at opposite ends of the first sides 222 and connected to the two first sides 222 via riser necks 240 to further enhance the shrinkage compensation effect. More specifically, one end of the upper cross runner 25 is connected to the upper sprue 23, and the other end extends between the two adjacent risers in a direction close to the upper risers 24. The upper parting surface 21 also includes an upper reinforcement 26 at each end of each upper core 22. The provision of the upper reinforcement 26 enhances the structural strength of the sand mold.

[0027] The support seat mold of the coated sand molding of the utility model is gradually reduced from the root to the free end by setting an upper riser, and the diameter of the root is set to D1 and the diameter of the free end is set to D2, D2=0.39~0.59D1, so that the upper riser can ensure a great shrinkage compensation effect with a very small safety factor, prevent the occurrence of shrinkage porosity and shrinkage cavities in the casting, thereby ensuring the internal quality of the casting and improving the casting yield.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. The support seat mold of coated sand molding is characterized by: It includes a lower mold and an upper mold corresponding to the lower mold; The lower mold has a lower parting surface, the lower parting surface protrudes to form a plurality of lower cores and a sprue pocket, a lower runner and a plurality of riser pockets located on one side of the lower core, the lower runner is connected to the sprue pocket, and the plurality of riser pockets are connected to the lower runner and the lower core; The upper mold has an upper parting surface corresponding to the lower parting surface, the upper parting surface protrudes to form multiple upper cores, upper sprues corresponding to the sprue sockets, and multiple upper risers, one upper core corresponds to one lower core, one upper riser corresponds to one riser socket, and a riser neck connected to the upper riser and the upper core is provided between the upper riser and the upper core, the upper riser has a root and a free end portion relative to the root away from the upper parting surface, the upper riser gradually shrinks from the root to the free end portion, the diameter of the root is D1, and the diameter of the free end portion is D2, D2=0.39~0.59D1.

2. The support seat mold for coated sand molding according to claim 1, characterized in that: D1=62.00±4mm, D2=30.00±4mm.

3. The support seat mold for coated sand molding according to claim 2, characterized in that: D1=62.00mm, D2=30.00mm.

4. The support seat mold for coated sand molding according to claim 1, characterized in that: The height of the upper riser is H, H=140.00~170.00mm, and the module of the riser neck is 6.50~9.00mm.

5. The support seat mold for coated sand molding according to claim 1, characterized in that: A plurality of exhaust needles protrude from the end surface of the upper mold core away from the upper parting surface, and the plurality of exhaust needles are arranged in a plurality of rows along the length direction of the upper mold core.

6. The support seat mold for coated sand molding according to claim 1, characterized in that: The upper core has two first sides along its length direction. In the width direction of the upper mold, two upper risers are provided between the first sides of each two adjacent upper cores close to each other. The two upper risers are respectively located at the two ends of the first side and are respectively connected to the two first sides through the riser necks.

7. The support seat mold for coated sand molding according to claim 1, characterized in that: In the length direction of the upper mold, the upper straight runner is provided between the ends of the two adjacent upper cores close to each other, and the upper parting surface is protruded with an upper cross runner located on the side of the upper straight runner close to the upper riser. The upper cross runner corresponds to the lower cross runner, and one end of the upper cross runner is connected to the upper straight runner, and the other end extends between the two adjacent risers in the direction close to the upper riser. The upper parting surface is also provided with an upper reinforcement at both ends of each of the upper cores.

8. The support seat mold for coated sand molding according to claim 1, characterized in that: The lower parting surface is provided with a lower reinforcement at both ends of each lower core. The upper mold and the lower mold are integrally formed. The upper mold and the lower mold are arranged side by side with a partition between them. The partition extends along the length direction of the upper core to separate the upper mold and the lower mold. The upper riser is conical.

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