Sand mold low-pressure casting mold for inclined wire outlet shell

Abstract

The utility model discloses an oblique outlet shell sand mold low-pressure casting mold which comprises an upper box, a lower box, a built-in sand core and an external sand core which are used for casting forming, the upper box and the lower box are detachably spliced into a box body, the built-in sand core and the external sand core are arranged in the box body, the external sand core is located between the upper box and the lower box, and the upper box and the lower box are detachably spliced into the box body. The external sand core is connected with the internal sand core in a clamped mode, sand collecting grooves are formed in the positioning and matching positions of the internal sand core and the external sand core and the lower box, a flange movable block is arranged on the oblique wire outlet position of the external sand core in a sleeved mode, and a chilling block is arranged on one side of the flange movable block. By pre-embedding the chiller, the defects such as shrinkage cavities and shrinkage porosity of important parts of the sealing groove of the casting flange are effectively avoided, so that the defect grade of the important parts reaches the standard; the external sand core can effectively solve the problem of difficulty in parting; smooth parting of the casting is ensured by adopting a flange loose piece to realize a flange segmentation mode; and shakeout in the casting is reduced by adding the sand collecting groove, and the casting quality of the casting is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casting mold equipment, and more specifically, particularly relates to a sand mold low-pressure casting mold for an oblique wire shell. Background Art

[0002] The power system housing is an important component of the switch. Compared with the welded housing, the cast aluminum alloy one-piece housing has the characteristics of low cost, high strength, reduced process complexity, and greatly shortened production cycle. It is a development trend to replace the welded tank with a cast aluminum alloy one-piece tank. The aluminum alloy housing has high requirements for strength and airtightness, so the casting is required to have very few internal defects and meet the first-level standard (GB). With the increasing trend of miniaturization and integration of switches, the new housing has a more complex shape and more complex mold parting, which greatly increases the difficulty of casting. At the same time, the quality of important parts cannot be guaranteed to meet the standards.

[0003] At present, large-scale power switch housings are generally produced by sand casting. However, in actual production, it is found that the products using sand casting technology have problems with low productivity and low pass rate. The main reason for the low pass rate is that the performance of cast aluminum alloy is low, the density of castings is poor, the forming technology needs to be improved, and the sand mold is prone to defects such as pinholes, sand holes, and sand falling. Utility Model Content

[0004] The utility model aims to provide a sand mold low-pressure casting mold for an oblique line housing.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: a low-pressure casting mold of a sand mold for an oblique-outlet shell, comprising an upper box, a lower box, an internal sand core and an external sand core for casting molding, the upper box and the lower box are detachably spliced ​​into a box body, the internal sand core and the external sand core are placed in the box body, the external sand core is located between the upper box and the lower box, the external sand core is clamped with the internal sand core, and a sand collecting groove is provided at the positioning matching position of the internal sand core and the external sand core with the lower box, the oblique-outlet part of the external sand core is sleeved with a flange loose block, and a cold iron is provided on one side of the flange loose block.

[0006] Preferably, the four corners of the upper box are provided with positioning bosses, in which iron columns are installed, and the four corners of the lower box are provided with positioning grooves matching the positioning bosses, and magnets are installed on the tops of the positioning grooves.

[0007] Preferably, a circular ceramic filter is placed at the gate at the bottom of the built-in sand core.

[0008] Preferably, both the external sand core and the internal sand core are provided with lifting screw holes.

[0009] Preferably, an anti-rotation positioning block is provided in the sand collecting tank, and the anti-rotation positioning block is engaged with one side of the built-in sand core.

[0010] Preferably, the upper box and the lower box are both iron sand boxes with an opening on one side, and a suspension rod is fixedly welded to the outside of the iron sand box.

[0011] Compared with the prior art, the advantages of the utility model are:

[0012] The boss positioning and positioning groove can achieve fast and accurate positioning, effectively avoiding casting size errors caused by closing the box;

[0013] By pre-embedded chillers, it is effectively ensured that defects such as shrinkage cavities and shrinkage pores do not occur in important parts of the casting flange sealing groove, so that the defect level of important parts meets the standard;

[0014] Since the casting cannot be directly parted from top to bottom and has multiple angles, the external sand core can effectively solve the parting difficulty problem;

[0015] The use of flange loose pieces to split the flange ensures smooth parting of the casting;

[0016] By adding a sand collecting trough, the sand falling inside the casting is reduced, thereby improving the casting quality of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a front view of a sand mold low-pressure casting mold of an oblique wire shell of the utility model;

[0019] Figure 2 It is a structural diagram of the upper box of the utility model;

[0020] Figure 3 It is a structural diagram of the lower box of the utility model;

[0021] Figure 4 It is a cross-sectional view of a sand mold low-pressure casting mold for an oblique outlet shell;

[0022] Figure 5 This is a structural diagram of the built-in sand core of the utility model;

[0023] Figure 6 It is a structural diagram of the external sand core of the utility model;

[0024] Figure 7 It is a structural diagram of the casting of the utility model.

[0025] In the figure: 1. Upper box; 2. Lower box; 3. Hanging rod; 4. Flange block; 5. Boss positioning; 6. Iron column; 7. Positioning groove; 8. Magnet; 9. Sand collecting trough; 10. Anti-rotation positioning block; 11. Iron sand box; 12. Cold iron; 13. Lifting screw hole; 14. Internal sand core; 15. External sand core; 16. Ceramic filter; 17. Gate. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0027] See also Figure 1-Figure 6 As shown, the utility model provides a sand mold low-pressure casting mold for an oblique-outlet shell, comprising an upper box 1, a lower box 2, an internal sand core 14 and an external sand core 15 for casting molding, the upper box 1 and the lower box 2 are detachably spliced ​​into a box body, the internal sand core 14 and the external sand core 15 are placed in the box body, the external sand core 15 is located between the upper box 1 and the lower box 2, the external sand core 15 is clamped with the internal sand core 14, and a sand collecting groove 9 is provided at the positioning matching position of the internal sand core 14 and the external sand core 15 and the lower box 2, the oblique-outlet portion of the external sand core 14 is sleeved with a flange movable block 4, and a cold iron 12 is provided on one side of the flange movable block 4.

[0028] In this embodiment, the four corners of the upper box 1 are provided with positioning bosses 5, and iron columns 6 are installed in the positioning bosses 5. The four corners of the lower box 1 are provided with positioning grooves 7 that match the positioning bosses 5, and magnets 8 are installed on the tops of the positioning grooves 7. When the upper box 1 and the lower box 2 are combined, they are precisely positioned by the positioning bosses 5 and the positioning grooves 7 to prevent misalignment when the boxes are combined and errors in the size of the castings.

[0029] In this embodiment, a circular ceramic filter screen 16 is placed at the pouring gate 17 at the bottom of the built-in sand core 14 to filter impurities in the aluminum liquid.

[0030] In this embodiment, since the sand core is heavy, lifting screw holes 13 are provided on both the external sand core 15 and the internal sand core 14. The gantry crane can be used to hang the chain on the lifting screw holes 13 embedded in the sand core for convenient lifting.

[0031] In this embodiment, an anti-rotation positioning block 10 is provided in the sand collecting tank 9 , and the anti-rotation positioning block 10 is engaged with one side of the built-in sand core 14 .

[0032] In this embodiment, the upper box 1 and the lower box 2 are both iron sand boxes 11 with one side open, and a suspension rod 3 is fixedly welded to the outside of the iron sand box 11.

[0033] The specific operation steps are as follows: first, the upper box 1 and the lower box 2 are horizontally shaped by the prepared wooden mold, the position where the casting needs to be rapidly cooled is buried in advance with the cold iron 12, and embedded in the box body, the boss in the upper box 1 is positioned and buried with the iron column 6, and the bottom of the positioning groove 7 of the lower box 2 is buried with the magnet 8;

[0034] Use furan resin sand, and after the sand mold is solidified, brush alcohol paint on the surface of the internal sand core 14 and the external sand core 15 to prevent sand from sticking to the casting and improve the surface finish of the casting. Put the prepared internal sand core 14 and the external sand core 15 into the lower box 2, first put the external sand core 15 and then put the internal sand core 14;

[0035] Because the sand core and the box body are heavy, the chain is hung on the pre-buried lifting screw hole 13 in the sand core through the gantry crane, and it is manually adjusted and placed accurately. Then, the lifting rods 3 on both sides of the upper box 1 are hung through the gantry crane chain, and it is manually adjusted. The box is accurately closed through concave and convex positioning. After the box is closed, the box body is transported to the low-pressure machine as a whole, and the gate 17 is aligned with the liquid rising furnace mouth of the low-pressure insulation furnace. The low-pressure machine cylinder is used to press the upper and lower boxes to ensure that they will not be opened during filling. The low-pressure pouring parameters are set for pouring. After the pressure holding ends, it is cooled for a period of time. After the casting is cooled, the casting is taken out. The casting is as shown in FIG. Figure 7 shown.

[0036] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, the patent owner may make various variations or modifications within the scope of the appended claims. As long as they do not exceed the protection scope described in the claims of the present invention, they should be within the protection scope of the present invention.

Claims

1. A low-pressure sand casting mold for an oblique outlet housing, comprising an upper box, a lower box, an internal sand core and an external sand core for casting, characterized in that: The upper box and the lower box are detachably spliced ​​into a box body, the internal sand core and the external sand core are placed in the box body, the external sand core is located between the upper box and the lower box, the external sand core is clamped with the internal sand core, and sand collecting grooves are provided at the locations where the internal sand core and the external sand core are positioned and matched with the lower box, the oblique outlet portion of the external sand core is sleeved with a flange movable block, and a chiller is provided on one side of the flange movable block.

2. The low-pressure sand casting mold for an inclined wire housing according to claim 1, characterized in that: The four corners of the upper box are provided with positioning bosses, in which iron columns are installed, and the four corners of the lower box are provided with positioning grooves matching the positioning bosses, and magnets are installed on the tops of the positioning grooves.

3. The low-pressure sand casting mold for an oblique outlet housing according to claim 1, characterized in that: A circular ceramic filter is placed at the gate at the bottom of the built-in sand core.

4. The low-pressure sand casting mold for an oblique outlet housing according to claim 1, characterized in that: The external sand core and the internal sand core are both provided with lifting screw holes.

5. The low-pressure sand casting mold for an oblique outlet housing according to claim 1, characterized in that: An anti-rotation positioning block is arranged in the sand collecting tank, and the anti-rotation positioning block is engaged with one side of the built-in sand core.

6. The low-pressure sand casting mold for an inclined wire housing according to claim 1, characterized in that: The upper box and the lower box are both iron sand boxes with an opening on one side, and a suspension rod is fixedly welded to the outside of the iron sand boxes.

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