A pressure-proof casting mold for iron mold covered sand casting
By designing sand-covered anti-pressure boss counterholes in the iron sand-covered casting mold, the problems of sand-covered lamination and insufficient gas discharge capacity at the edge of the mold cavity are solved, and high-quality production and production efficiency of the castings are improved.
Patent Information
- Application Number
- CN202420669785.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-04-02
AI Technical Summary
In the production process of iron sand-covered castings, the sand-covered layer on the edge of the mold cavity is easily crushed due to hard contact, resulting in defects or dents of the casting sand holes, and insufficient gas discharge capacity of the cavity, affecting the filling.
A die-casting mold is designed, including a sand-covered anti-pressure boss counterhole. By setting sand-covered anti-pressure bosses on both sides of the mold base plate, a gap with the casting mold is formed to prevent hard contact of the sand-covered layer and reserve space for quartz sand expansion.
It effectively prevents sand lamination at the edge of the mold cavity parting surface, reduces sand hole defects and dents of the castings, improves the gas discharge capacity of the cavity, ensures smooth filling, and does not require increased manual repair or material investment, maintains production efficiency and reduces costs.
Smart Images
Figure CN222740212U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of casting, and in particular relates to a pressure-proof casting mold for an iron mold covered with sand casting. Background Art
[0002] During the production process of the iron mold sand-coated crankshaft, the upper and lower iron mold sand-coated molds are obtained after the mold is shot. The existing iron mold sand-coated production has the following problems: First, due to the deformation of the iron mold parting surface, the presence of debris, or the sand coating layer being pulled up by the friction force given by the pattern during demolding, it is generally higher than the iron mold parting surface, which causes the sand coating layer to be in contact first during the closing operation, and bear the gravity of the upper iron mold and the buckling force of the box, resulting in the sand coating layer being unable to withstand the force and breaking. In particular, the sand coating layer at the edge of the cavity is very easy to break and fall off in the casting, causing sand eye defects in the casting. Second, the sand coating layer on the parting surface will limit the expansion of the sand coating layer (it will expand when encountering molten iron) due to the tight contact between the upper and lower boxes, and the expansion of the sand coating layer is blocked, and it is easy to break and bulge, forming dents on the surface of the casting, affecting the appearance. Third, the molding sand of the upper and lower molds is in contact, the gap between the parting surfaces is small, and the gas discharge capacity of the cavity is not high, which affects the filling of the mold. Therefore, before the upper and lower iron molds are combined, first of all, it is necessary to scrape the raised surface sand layer of the sand box parting surface smooth, and then place 4 anti-pressure fiber gaskets on each side of the outer edge of the parting surface. The purpose is to separate the sand layer at the edge of the cavity by a certain gap to avoid hard contact.
[0003] Therefore, before the mold is closed, the mold parting surface needs to be trimmed and fiber anti-pressure gaskets need to be placed to prevent the sand from collapsing when the molds are matched after closing, to provide a space for the sand layer to expand and to improve the gas discharge capacity of the mold cavity. However, the mold repair time takes 40-60 seconds per box, which not only increases manual operation and prolongs the molding cycle time, but also reduces production efficiency and increases costs. Summary of the invention
[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a pressure-proof casting mold for iron mold sand-covered castings, which aims to prevent the mold cavity from being crushed due to hard contact with the raised sand covering layer at the edge of the parting surface, and to prevent dents in the casting caused by the rupture of the cavity bulge by reserving an accommodation space for the expansion of quartz sand; the venting of the mold parting surface is strengthened to make the filling smooth; there is no additional manual repair and no increase in material input, that is, no increase in cost and no impact on production efficiency.
[0005] In order to achieve the above purpose, the specific scheme of the utility model is as follows:
[0006] A pressure-proof casting mold for an iron mold sand-covered casting comprises a sand-covered pressure-proof boss countersunk hole, a mold base plate for forming a parting surface of the iron mold sand-covered casting mold, a casting mold outer shape mold surrounded by the mold base plate, and a sand-covered sand box, two rows of sand-covered pressure-proof boss countersunk holes are respectively arranged on both sides of the mold base plate, and the enclosing position of the casting mold outer shape mold is between the two rows of sand-covered pressure-proof boss countersunk holes, the casting mold outer shape mold and the mold base plate are surrounded to form a sand-covered layer, a sand-covered sand box cover is arranged on the mold base plate, and after the sand-covered layer is sand-shot and solidified, the sand-shot and solidified sand-covered layer and the mold base plate form an iron mold sand-covered casting mold with a sand-covered pressure-proof boss.
[0007] Furthermore, the gaps between the two rows of sand-covered anti-pressure boss countersunk holes and the outer mold of the casting mold are 10 mm respectively, and at least five sand-covered anti-pressure boss countersunk holes are arranged in each row. The diameter of each sand-covered anti-pressure boss countersunk hole is 20 mm and the depth is 0.5-2 mm.
[0008] Furthermore, the mold bottom plate is configured as a flat plate whose center is hollowed out according to the outer dimensions of the iron mold sand-coated casting and whose size is 100 mm larger than the outer dimensions of the casting mold.
[0009] Furthermore, the casting mold outer shape mold is a solid outer shape mold.
[0010] Furthermore, the sand-coated sand box is a cast iron sand box, the outer dimensions of the sand-coated sand box are the same as those of the mold bottom plate, and the hollow shape dimensions are 5 to 8 mm larger than the outer shape dimensions of the casting mold.
[0011] Advantages of the utility model
[0012] Compared with the traditional iron mold sand-coated casting production, the use of the anti-pressure casting mold of the iron mold sand-coated casting of the utility model is applied to the production of iron mold sand-coated castings, which ensures the stable and consistent performance of the matching mold gap, and at the same time can reduce the burr of the casting parting surface, which can be removed by shot blasting, so that the casting does not need to be cleaned, the workload of casting cleaning is reduced, and the work efficiency of crankshaft casting cleaning is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic structural diagram of a pressure-proof casting mold for an iron-mold sand-coated crankshaft casting according to a specific embodiment.
[0014] Figure 2 for Figure 1 Schematic diagram of the installation of the middle mold base plate, the crankshaft casting mold outer mold and the sand-covered anti-pressure boss countersunk hole.
[0015] Figure 3 for Figure 2 Stereoscopic diagram.
[0016] In the figure:
[0017] 1. Mold bottom plate; 2. Crankshaft casting mold outer shape mold; 3. Sand-covered anti-pressure boss countersink; 4. Sand-covered sand box. DETAILED DESCRIPTION
[0018] The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that this specific embodiment is not intended to limit the scope of rights of the present invention.
[0019] like Figure 1 and Figure 2 As shown, in this specific embodiment, taking an iron mold sand-coated crankshaft casting as an example, a pressure-proof casting mold for an iron mold sand-coated crankshaft casting is provided, comprising a sand-coated pressure-proof boss countersunk hole 3, a mold base plate 1 for forming a casting parting surface of the iron mold sand-coated crankshaft casting, a crankshaft mold outer mold 2 enclosed by the mold base plate 1, and a sand-coated sand box 4.
[0020] The mold base plate 1 is set as a flat plate with a size that is 100mm larger than the crankshaft casting mold outer shape mold 2 according to the size of the iron mold sand-covered casting. Two rows of sand-covered anti-pressure boss countersunk holes 3 are respectively arranged on both sides of the mold base plate 1, and the enclosed position of the crankshaft casting mold outer shape mold 2 is between the two rows of sand-covered anti-pressure boss countersunk holes 3. The two rows of sand-covered anti-pressure boss countersunk holes 3 are respectively 10mm away from the edge of the casting mold outer shape mold 2. Five sand-covered anti-pressure boss countersunk holes 3 are respectively arranged in each row. During the sand-shooting molding, a sand-covered anti-pressure boss with a diameter of 20mm and a height of 0.5-2mm will be formed at the corresponding position of the edge of the crankshaft casting mold outer shape mold 2. The sand-covered anti-pressure boss is higher than the parting surface of the iron-mold sand-covered crankshaft casting. Therefore, after the box is closed, the sand-covered anti-pressure boss first contacts the parting surface of the iron-mold sand-covered crankshaft casting, so that the sand-covered layer of the parting surface of the iron-mold sand-covered crankshaft casting cavity does not contact, and is thus protected from being crushed. In addition, this gap can also serve as a accommodating space for the expansion of quartz sand to prevent the sand-covered layer of the mold from cracking and bulging, causing dents in the casting. At the same time, this measure can also increase the exhaust gap of the parting surface, which is conducive to the discharge of gas from the cavity, making the filling smooth without causing molten iron to leak from the parting surface.
[0021] The casting mold outer shape mold 2 is a solid outer shape mold. The casting mold outer shape mold 2 and the mold bottom plate 1 are surrounded to form a sand coating layer. The sand coating sand box 4 is a cast iron sand box. The outer dimensions of the sand coating sand box 4 are the same as those of the mold bottom plate 1, and the hollow shape dimensions are 5 to 8 mm larger than the casting mold outer shape mold 2. The sand coating sand box cover 4 is arranged on the mold bottom plate 1, and after the sand coating layer is solidified by sand shooting, the sand coating layer after sand shooting and solidification and the mold bottom plate 1 form an iron mold sand coating casting mold with a sand coating anti-pressure boss.
[0022] The anti-pressure casting mold of the iron mold sand-coated crankshaft of the above-mentioned specific embodiment can realize the iron mold sand-coated crankshaft casting parting surface without trimming, which can save 30 seconds for each box of casting production. Calculated by producing 500 boxes of castings per day, 250 minutes of casting repair time can be saved every day. Using the anti-pressure casting mold of the iron mold sand-coated crankshaft, five sand-coated anti-pressure boss countersunk holes with a diameter of 20mm and a depth of 0.5mm are respectively added on both sides of the mold bottom plate. After the sand coating, 5 sand-coated anti-pressure bosses with a diameter of 20mm and a height of 0.5mm are formed on each side of the casting parting surface. The sand-coated anti-pressure bosses replace the manually placed fiber filter screen anti-pressure gaskets, and each box of casting reduces the gasket placement time by 30 seconds. Calculated by producing 500 boxes per day, 250 minutes of fiber gasket placement time can be saved every day, and 250 fiber filters can be saved at the same time, which has considerable benefits in improving the molding production efficiency and saving the production material cost.
Claims
1. A pressure-proof casting mold for iron mold sand-covered castings, characterized in that: The invention comprises a sand-covered anti-pressure boss countersunk hole, a mold base plate for forming a parting surface of an iron mold sand-covered casting mold, a casting mold outer shape mold surrounded by the mold base plate, and a sand-covered sand box, two rows of sand-covered anti-pressure boss countersunk holes are respectively arranged on both sides of the mold base plate, and the enclosing position of the casting mold outer shape mold is between the two rows of sand-covered anti-pressure boss countersunk holes, the casting mold outer shape mold and the mold base plate are surrounded to form a sand-covered layer, a sand-covered sand box cover is arranged on the mold base plate, and after the sand-covered layer is solidified by sand-shooting, the solidified sand-covered layer and the mold base plate form an iron mold sand-covered casting mold with a sand-covered anti-pressure boss.
2. The pressure-proof casting mold for an iron mold covered with sand casting according to claim 1, characterized in that: The gaps between the two rows of sand-covered anti-pressure boss countersunk holes and the outer mold of the casting mold are 10 mm respectively. At least five sand-covered anti-pressure boss countersunk holes are arranged in each row. The diameter of each sand-covered anti-pressure boss countersunk hole is 20 mm and the depth is 0.5-2 mm.
3. The pressure-proof casting mold for an iron mold covered with sand casting according to claim 1, characterized in that: The mold bottom plate is set as a flat plate with a size that is 100mm larger than the outer shape of the casting mold and the center of the hollow plate is hollowed out according to the outer shape of the iron mold sand-coated casting.
4. The pressure-proof casting mold for iron mold sand-coated casting according to claim 1, characterized in that: The casting mold outer shape mold is a solid outer shape mold.
5. The pressure-proof casting mold for iron mold sand-covered casting according to claim 1, characterized in that: The sand-covered sand box is a cast iron sand box, the outer dimensions of the sand-covered sand box are the same as those of the mold bottom plate, and the hollow shape dimensions are 5 to 8 mm larger than the outer shape dimensions of the casting mold.