A low-pressure casting mold for a thin-walled box

Abstract

The present invention is a low-pressure casting mold for a thin-walled box, comprising a metal bottom plate, a metal lower mold installed at the bottom of the metal bottom plate and a metal upper mold installed at the top, a gate arranged in the middle of the metal lower mold, a runner sand plate installed in the metal bottom plate, an outer sand core installed on the metal upper mold, an inner sand core installed in the outer sand core, columns for fixing the outer sand core installed at the four corners of the outer sand core on the upper surface of the metal upper mold, an upper pressure plate installed on the top of the four columns, the outer sand core and the inner sand core, radial runners arranged correspondingly on the upper surface of the metal lower mold and the lower surface of the runner sand plate, eight vertical tubes arranged upward in four directions at the bottom of the outer sand core, through holes corresponding to the eight vertical tubes arranged on the runner sand plate, the through holes connected to the radial runners, an inner gate arranged between the eight vertical tubes of the outer sand core and the inner sand core, and a top riser arranged on the inner top of the outer sand core. The outer surface of the thin-walled box of the present invention is directly cast and formed without mechanical processing, thereby ensuring the internal quality requirements of thin-walled castings with a large area.

Description

Technical Field

[0001] The invention relates to the field of casting of thin-walled boxes, and in particular to a low-pressure casting mold for thin-walled boxes. Background Art

[0002] The thin-walled box has a large area and a flat surface, and a small wall thickness. It is a large-area thin-walled casting. Although the internal and external shapes are relatively simple, the internal quality of the casting is inspected and accepted according to Class I castings in HB 5480-91. Due to the structure of the casting, the thin wall is a box structure, which increases the deformation after casting and heat treatment. The local wall thickness is large and shrinkage compensation is required. The casting difficulty is not small, and the pouring and rising system needs to be carefully analyzed and studied. The casting must meet the requirements of wall thickness and inner cavity size tolerance, as well as the unprocessed appearance requirements of the outer surface. During casting, the pouring and rising design should also take into account the prevention of deformation of the casting. Summary of the invention

[0003] The invention aims to cast a qualified thin-wall box body and provides a low-pressure casting mold for the thin-wall box body.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A low-pressure casting mold for a thin-walled box body comprises a metal base plate, a metal lower mold is installed at the bottom of the metal base plate and a metal upper mold is installed at the top, a gate is opened in the middle position of the metal lower mold, a runner sand plate is installed inside the metal base plate, an outer sand core is installed on the metal upper mold corresponding to the runner sand plate, an inner sand core is installed inside the outer sand core, columns for fixing the outer sand core are installed at the four corners of the outer sand core on the upper surface of the metal upper mold, an upper pressure plate is installed on the top of the four columns, the outer sand core and the inner sand core, radial runners are arranged on the upper surface of the metal lower mold and the lower surface of the runner sand plate respectively, eight vertical cylinders are arranged in four directions upward from the bottom of the outer sand core, through holes corresponding to the eight vertical cylinders are arranged on the runner sand plate, the through holes are connected to the radial runners, an inner gate is arranged between the eight vertical cylinders of the outer sand core and the inner sand core, and a top riser is arranged on the top of the outer sand core.

[0006] The gate is provided with a ceramic filter screen at one end close to the runner sand plate, a ceramic gate sleeve is provided outside the ceramic filter screen inside the gate, and a gate pressing plate is provided outside the ceramic gate sleeve.

[0007] A fiber filter is arranged between the through hole at the top of the runner sand plate and the vertical cylinder at the bottom of the outer sand core.

[0008] Refractory fiber cloth is arranged between the columns, the outer sand core, the top of the inner sand core and the bottom of the upper pressing plate.

[0009] Baffles are arranged outside the outer sand core between the two front columns and between the two rear columns.

[0010] Hanging rods are installed on the top ends of the side walls of the four columns by fastening with bolts.

[0011] A cavity for installing a metal lower mold and a metal upper mold is provided in the middle of the metal bottom plate, metal upper mold installation grooves are provided in the middle of the four sides of the cavity on the upper surface of the metal bottom plate, and a square retaining ring is provided on the outer periphery of the metal lower mold on the lower surface of the metal bottom plate.

[0012] The gate in the metal lower mold is a stepped hole.

[0013] The bottom of the metal upper mold is provided with a plurality of mounting convex strips corresponding to the metal upper mold mounting grooves, and the mounting convex strips are clamped in the metal upper mold mounting grooves of the metal bottom plate.

[0014] The upper surface of the metal upper mold is provided with four column installation grooves corresponding to the four columns, and the columns are installed in the column installation grooves.

[0015] The beneficial effects of the present invention are as follows: the outer surface of the thin-walled box body of the present invention is directly cast without mechanical processing, thereby ensuring the internal quality requirements of a thin-walled casting with a larger area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of one aspect of the present invention;

[0017] Figure 2 It is a structural schematic diagram of another aspect of the present invention;

[0018] Figure 3 A top view of the present invention;

[0019] Figure 4 for Figure 3 Sectional view of AA in the middle;

[0020] Figure 5 It is a structural schematic diagram of a metal base plate in one direction;

[0021] Figure 6 This is a schematic diagram of the structure of the metal base plate in another direction;

[0022] Figure 7 It is a schematic diagram of the structure of the metal lower die in one direction;

[0023] Figure 8 It is a schematic diagram of the structure of the metal lower die in another direction;

[0024] Fig. 9 It is a schematic diagram of the structure of the metal upper mold;

[0025] Fig.10 It is a structural schematic diagram of the runner sand plate in one direction;

[0026] Fig.11This is a structural diagram of the runner sand plate in another direction;

[0027] Fig.12 It is a structural schematic diagram of the outer sand core in one direction;

[0028] Fig.13 It is a structural schematic diagram of the outer sand core in another direction;

[0029] Fig.14 It is a structural schematic diagram of the inner sand core in one direction;

[0030] Fig.15 This is a schematic diagram of the structure of the inner sand core in another direction;

[0031] Fig.16 It is a structural schematic diagram of one direction of the casting product;

[0032] Fig.17 It is a structural schematic diagram of another direction of casting products;

[0033] in, Figure 3 In order to clearly show the internal structure, the upper pressure plate, refractory fiber cloth, columns, baffles and other components are hidden. Figure 4 The pillars are also hidden in the middle;

[0034] In the figure: 1-metal bottom plate; 2-metal lower mold; 3-metal upper mold; 4-gate; 5-sprue sand plate; 6-external sand core; 7-inner sand core; 8-column; 9-upper pressure plate; 10-radial runner; 11-vertical cylinder; 12-through hole; 13-inner gate; 14-top riser; 15-ceramic filter; 16-ceramic gate sleeve; 17-gate pressure plate; 18-fiber filter; 19-refractory fiber cloth; 20-baffle; 21-suspender rod; 22-cavity; 23-metal upper mold installation groove; 24-square retaining ring; 25-installation convex strip; 26-column installation groove;

[0035] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0037] like Figures 1 to 15As shown, a low-pressure casting mold for a thin-walled box body comprises a metal bottom plate 1, a metal lower mold 2 is installed at the bottom of the metal bottom plate 1 and a metal upper mold 3 is installed at the top, a gate 4 is opened in the middle of the metal lower mold 2, a runner sand plate 5 is installed inside the metal bottom plate 1, an outer sand core 6 is installed on the metal upper mold 3 corresponding to the runner sand plate 5, an inner sand core 7 is installed inside the outer sand core 6, and columns 8 for fixing the outer sand core 6 are installed at the four corners of the outer sand core 6 on the upper surface of the metal upper mold 3, and the four columns are provided to fix the outer sand core 6. An upper pressure plate 9 is installed on the top of the column 8, the outer sand core 6, and the inner sand core 7. A radial runner 10 is provided on the upper surface of the metal lower mold 2 corresponding to the lower surface of the runner sand plate 5. Eight vertical cylinders 11 are provided in four directions upward from the bottom of the outer sand core 6. Through holes 12 corresponding to the eight vertical cylinders 11 are provided on the runner sand plate 5. The through holes 12 are connected to the radial runner 10. An inner gate 13 is provided between the eight vertical cylinders 11 of the outer sand core 6 and the inner sand core 7. A top riser 14 is provided on the top of the outer sand core 6.

[0038] The gate 4 is provided with a ceramic filter screen 15 at one end close to the runner sand plate 5 , a ceramic gate sleeve 16 is provided outside the ceramic filter screen 15 inside the gate 4 , and a gate pressing plate 17 is provided outside the ceramic gate sleeve 16 .

[0039] A fiber filter 18 is provided between the top through hole 12 of the runner sand plate 5 and the bottom vertical cylinder 11 of the outer sand core 6 .

[0040] A refractory fiber cloth 19 is provided between the tops of the columns 8 , the outer sand core 6 , the inner sand core 7 and the bottom of the upper pressing plate 9 .

[0041] Baffles 20 are provided outside the outer sand core 6 between the two front columns 8 and between the two rear columns 8 .

[0042] The top ends of the side walls of the four columns 8 are fastened with suspension rods 21 by bolts.

[0043] A cavity 22 for installing a metal lower mold 2 and a metal upper mold 3 is provided in the middle of the metal base plate 1 , a metal upper mold installation groove 23 is provided in the middle of the four sides of the cavity 22 on the upper surface of the metal base plate 1 , and a square retaining ring 24 is provided on the outer periphery of the metal lower mold 2 on the lower surface of the metal base plate 1 .

[0044] The gate 4 in the metal lower mold 2 is a stepped hole.

[0045] The bottom of the metal upper mold 3 is provided with a plurality of mounting convex strips 25 corresponding to the metal upper mold mounting grooves 23 , and the mounting convex strips 25 are snap-fitted into the metal upper mold mounting grooves 23 of the metal bottom plate 1 .

[0046] Four column mounting grooves 26 are provided on the upper surface of the metal upper mold 3 corresponding to the four columns 8 , and the columns 8 are installed in the column mounting grooves 26 .

[0047] The products of the present invention are Figures 16 to 17 As shown, the thin-walled box body to be cast has its inclined opening facing upward, and the bottom surface (292mm×212mm) opposite to the inclined surface facing downward, and the bottom surface (area 292mm×212mm) is simultaneously cast using multiple inner gates 13, so as to ensure the molding and shrinkage compensation at the intersection of the bottom wall corners; the shrinkage compensation is carried out by adding vertical tubes 11 to the gaps around, and multiple top risers 14 are provided to connect with the vertical tubes 11 to ensure the quality of the flange surface, while the sand core is discharged smoothly, so that the formation of insufficient pouring, slag inclusions, pores and other defects can be avoided. Due to the multiple gaps and vertical tubes 11, the thick ribs away from the gate and the wall intersection corners do not need to be quenched with cold iron to prevent shrinkage defects.

[0048] The bottom of the runner sand plate 5 adopts a radial runner 10, which is connected to the inner gate 13 and the vertical tube 11; the vertical tube 11 and several thick ribs are compensated for shrinkage through the inner gate 13; the upper part of the vertical tube 11 is connected to the top riser 14 to ensure the exhaust and slag removal of the flange surface and compensation for shrinkage. According to the wall thickness and the compensation distance of the gap runner, two vertical tubes 11 are designed on each side.

[0049] The outer sand core 6 and the inner sand core 7 are respectively made by a cold core box in a core shooting machine; the bottom runner sand plate 5 is made by a hot core box due to its small size. The sand mold assembly and positioning use metal modules, and a part of the radial runner 10 is formed by the metal lower mold 2.

[0050] The mold as a whole adopts a composite method of sand mold and metal mold to produce castings.

[0051] The outer surface of the thin-wall box body of the present invention is directly cast without mechanical processing, thereby ensuring the internal quality requirements of a thin-wall casting with a larger area.

[0052] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A low-pressure casting mold for a thin-walled box, characterized in that: The invention comprises a metal base plate (1), wherein a metal lower mold (2) is installed at the bottom of the metal base plate (1) and a metal upper mold (3) is installed at the top, a gate (4) is opened in the middle of the metal lower mold (2), a runner sand plate (5) is installed inside the metal base plate (1), an outer sand core (6) is installed on the metal upper mold (3) corresponding to the runner sand plate (5), an inner sand core (7) is installed inside the outer sand core (6), and columns (8) for fixing the outer sand core (6) are installed at the four corners of the outer sand core (6) on the upper surface of the metal upper mold (3), the four columns (8), the outer sand core (6), An upper pressure plate (9) is installed on the top of the inner sand core (7); a radial runner (10) is provided on the upper surface of the metal lower mold (2) and the lower surface of the runner sand plate (5) in correspondence; eight vertical cylinders (11) are provided on the bottom of the outer sand core (6) in four directions upward; through holes (12) corresponding to the eight vertical cylinders (11) are provided on the runner sand plate (5); the through holes (12) are connected to the radial runner (10); an inner gate (13) is provided between the eight vertical cylinders (11) of the outer sand core (6) and the inner sand core (7); and a top riser (14) is provided on the inner top of the outer sand core (6); A cavity (22) for mounting a metal lower die (2) and a metal upper die (3) is provided in the middle of the metal bottom plate (1); metal upper die mounting grooves (23) are provided in the middle of four sides of the cavity (22) on the upper surface of the metal bottom plate (1); and a square retaining ring (24) is provided on the lower surface of the metal bottom plate (1) at the periphery of the metal lower die (2); The gate (4) in the metal lower mold (2) is a stepped hole; The radial runner (10) is connected to the inner gate (13) and the vertical tube (11); the upper part of the vertical tube (11) is connected to the top riser (14); and each side of the vertical tube (11) has two radial runners.

2. A low-pressure casting mold for a thin-walled box according to claim 1, characterized in that: The gate (4) is provided with a ceramic filter screen (15) at one end close to the runner sand plate (5), a ceramic gate sleeve (16) is provided inside the gate (4) and outside the ceramic filter screen (15), and a gate pressure plate (17) is provided outside the ceramic gate sleeve (16).

3. A low-pressure casting mold for a thin-walled box according to claim 2, characterized in that: A fiber filter screen (18) is provided between the through hole (12) at the top of the runner sand plate (5) and the vertical cylinder (11) at the bottom of the outer sand core (6).

4. A low-pressure casting mold for a thin-walled box according to claim 3, characterized in that: A refractory fiber cloth (19) is provided between the top of the upright column (8), the outer sand core (6), the inner sand core (7) and the bottom of the upper pressing plate (9).

5. A low-pressure casting mold for a thin-walled box according to claim 4, characterized in that: Baffles (20) are provided outside the outer sand core (6) between the two front columns (8) and between the two rear columns (8).

6. A low-pressure casting mold for a thin-walled box according to claim 5, characterized in that: The top ends of the side walls of the four uprights (8) are fastened with suspension rods (21) by bolts.

7. A low-pressure casting mold for a thin-walled box according to claim 6, characterized in that: The bottom of the metal upper die (3) is provided with a plurality of mounting convex strips (25) corresponding to the metal upper die mounting grooves (23), and the mounting convex strips (25) are snap-fitted into the metal upper die mounting grooves (23) of the metal bottom plate (1).

8. A low-pressure casting mold for a thin-walled box according to claim 7, characterized in that: The upper surface of the metal upper mold (3) is provided with four column mounting grooves (26) corresponding to the four columns (8), and the columns (8) are mounted in the column mounting grooves (26).

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