CN106925720A - A sand mold for casting long arm type castings - Google Patents

Abstract

The utility model provides a sand mould for casting long arm type foundry goods, the mould is double-cavity structure, including mould cope match-plate pattern bottom plate, mould drag-plate pattern bottom plate and psammitolite, is equipped with the mould cope match-plate pattern on the mould cope match-plate pattern bottom plate, is equipped with the mould drag-plate pattern on the mould drag-plate pattern bottom plate, and mould cope match-plate pattern bottom plate, mould drag-plate pattern bottom plate and sand core each part all are overall structure, and the psammitolite is through export core head location installation, is equipped with the mould locating hole on the mould. According to the sand mold die for casting the long-arm type casting, the hollow part adopts the integral large sand core, so that the residue of a combined core joint is avoided, the dimensional precision of the integral core is high, the uniform wall thickness of the casting can be ensured, the outlets on two sides are positioned by adopting an inclination pattern and a small gap, and the accurate positioning is realized; the mould adopts a double-cavity structure, so that the comprehensive cost is reduced, and the production efficiency is improved.

Description

A sand mold for casting long arm type castings

technical field

The invention relates to the technical field of casting, in particular to a sand mold.

Background technique

The general connecting rod products are short and thin. The mold making plan of this kind of casting products is that the center line is divided equally, and the mounting holes on both sides are processed, which can meet the requirements of the product. However, with the rapid development of the machinery industry, especially the deepening of robots In research and development, the design of the connecting rod (generally called the arm) is very complicated. Considering the large-scale and multi-directional movement of the robot, the arm needs to be designed to be very long. In order to consider weight reduction, the middle needs to be designed in a hollow style, and the installation design on both sides It is more complicated, and it is necessary to set the rotating shaft hole and the fastening hole. For such a complex product with high requirements, traditional molds cannot realize it.

Contents of the invention

In order to solve the problem that long-arm castings cannot be cast, the invention provides a sand mold for casting long-arm castings.

The technical solution adopted by the present invention to achieve the above object is: a sand mold for casting long arm castings, the mold is a double-cavity structure, including a mold bottom plate 1, a mold bottom plate 2 and a sand core 8, The mold upper plate 1 is provided with the mold upper plate 4, the mold lower plate 2 is provided with the mold lower plate 7, and each part of the mold upper plate 1, the mold lower plate 2 and the sand core 8 is an integral structure, and the sand core 8 is installed through the positioning of the outlet core head 6, and the mold positioning hole 3 is provided on the bottom plate 1 of the mold upper mold.

The outlets on both sides of the sand core 8 are provided with a slope structure and a small gap, and the middle part of the sand core 8 is provided with a lifting ring.

The sand core 8 is positioned by the auxiliary core stays installed on the upper mold 4 and the lower mold 7 .

Also comprise sand core box, core box coaming plate 11 is installed around sand core box base 14 top, core box top is provided with core box left cover plate 9 and core box right cover plate 10.

A core box locking structure 13 is provided at the end of the core box coaming 11 located at one end of the sand filling port 12 , and a weight-reducing groove 15 is provided outside the core box coaming 11 .

In the sand mold for casting long arm castings of the present invention, the hollow part adopts an integral large sand core, which avoids the residue of the joint of the combined core, and the dimensional accuracy of the integral core is high, which can ensure the uniform wall thickness of the casting. The slope style and small gap can achieve precise positioning; the mold adopts a double-cavity structure, which not only reduces the overall cost, but also improves production efficiency.

Description of drawings

Fig. 1 is the structure diagram of the upper mold bottom plate of the sand mold for casting long arm type castings according to the present invention.

Fig. 2 is the structural diagram of the bottom plate of the sand mold used for casting long-arm castings according to the present invention.

Fig. 3 is a sand core structure diagram of the sand mold used for casting long arm type castings according to the present invention.

Fig. 4 is a structural diagram of a sand core box of a sand mold for casting long-arm castings according to the present invention.

Fig. 5 is an exploded structure diagram of the sand core box of the sand mold used for casting long-arm castings according to the present invention.

Fig. 6 is a front structural view of the product produced by the sand mold for casting long-arm castings according to the present invention.

Fig. 7 is the reverse structure diagram of the product produced by the sand mold used for casting long arm type castings according to the present invention.

Fig. 8 is a front view cross-sectional structure diagram of a product produced by a sand mold for casting long-arm castings according to the present invention.

In the figure: 1. Mold top plate, 2. Mold bottom plate, 3. Mold positioning, 4. Mold top, 5. Logo, 6. Core head, 7. Mold bottom, 8. Sand core, 9. Core box left cover, 10, core box right cover, 11, core box enclosure, 12, sand filling port, 13, core box locking, 14, core box base, 15, weight loss groove.

detailed description

The sand mold structure for casting long arm type castings of the present invention is as shown in Figure 1-3, and mold is double-cavity structure, comprises mold bottom plate 1, mold bottom plate 2 and sand core 8, and mold bottom plate 1 is provided with mold upper mold 4, and mold lower mold bottom plate 2 is equipped with mold lower mold 7, and each part of mold upper mold bottom plate 1, mold lower mold bottom plate 2 and sand core 8 is an integral structure, and sand core 8 passes through the outlet core The head 6 and the auxiliary core support installed on the upper mold 4 and the lower mold 7 are positioned. The outlets on both sides of the sand core 8 are provided with a slope structure and a small gap. The middle part of the sand core 8 is provided with a lifting ring. Die positioning holes 3 are provided.

It also includes a sand core box, the structure of which is shown in Figure 4-5. A core box enclosure 11 is installed around the upper part of the sand core box base 14, and the upper part of the core box is provided with a core box left cover 9 and a core box right cover 10, which are located in the filling A core box locking structure 13 is provided at the end of the core box coaming 11 at one end of the sand port 12 , and a weight-reducing groove 15 is provided outside the core box coaming 11 .

The product structure produced by this mold is shown in Figure 1-3.

The material of the mold of the present invention needs to undergo aging treatment, and the aging treatment needs to adopt natural aging. The aging includes rough aging and aging after rough machining. The total time is more than one quarter, so that the internal stress can be completely released, and then the expected effect can be achieved. Not only can the size of the mold be guaranteed Precision, and can improve the life; all mold parts adopt the integral form to ensure the high strength and long life of the mold, and the opposite side of the cavity is provided with reinforcing ribs to ensure uniform wall thickness and reasonable weight reduction. The hollow part adopts the overall large sand core, which avoids the residue of the joint of the combined core. The positioning of the overall large sand core in the hollow part cannot rely solely on the positioning of several outlet core heads. The middle part and corners need auxiliary core supports to assist in positioning. Both need to be added, considering the deformation of the sand core itself and the deformation after heating, the use of the core support can make the positioning of the large sand core more accurate, the wall thickness of the casting is more uniform, the dimensional accuracy of the overall core is high, and the hanging ring is embedded in the middle, which is convenient for hoisting and stable Under the core. The outlets on both sides are positioned with a slope pattern and a small gap to achieve precise positioning; products with long arms tend to bend during the cooling process of the casting, and the anti-disturbance design is added to ensure the straightness and plane of the casting. degree; the determination of the scale is very important, the value of the length direction is much larger than that of the width and height, the choice of the scale is slightly larger. Since the inner part of the casting is hindered by the large sand core when shrinking, the scale of the inner cavity is slightly smaller than the scale of the outer shape; because the product is relatively long, the machining center with a general stroke cannot complete the processing at one time, so the protective cover is removed , and then can be partly processed many times, and finally the mold processing can be realized on the machining center of the general stroke, and the mold processing cost can be reduced. Due to the structural characteristics of the long strip type, considering the favorable factors of the stability of the subsequent casting sand mold and the yield rate of the process, the mold design adopts a double-cavity style, which not only reduces the overall cost, but also improves the production efficiency. Due to the long mold parts, it is necessary to refer to the same datum during multiple part processing to avoid errors caused by multiple alignment and centering. The same datum can make the dimensional accuracy of the parts more accurate.

The present invention has been described by means of embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, the features and examples may be modified to adapt a particular situation and material to the teachings of the invention without departing from the spirit and scope of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed here, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present invention.

Claims (5)

1. A sand mold for casting long arm type castings, characterized in that: the mold is a double-cavity structure, including a mold upper plate (1), a mold lower plate (2) and a sand core (8), the mold The upper mold bottom plate (1) is provided with a mold upper mold (4), the mold lower mold bottom plate (2) is provided with a mold lower mold (7), the mold upper mold bottom plate (1), the mold lower mold bottom plate (2) and sand Each part of the core (8) is an integral structure, the sand core (8) is positioned and installed through the outlet core head (6), and a mold positioning hole (3) is provided on the upper mold bottom plate (1) of the mold. 2. A sand mold for casting long arm castings according to claim 1, characterized in that: the outlets on both sides of the sand core (8) are provided with a slope structure and a small gap, and the sand core (8) There is a ring in the middle. 3. A sand mold for casting long arm castings according to claim 1, characterized in that: the sand core (8) is installed on the upper mold (4) and the lower mold (7) Auxiliary core support positioning. 4. A sand mold for casting long arm castings according to claim 1, characterized in that: it also includes a sand core box, and a core box coaming (11) is installed around the upper part of the sand core box base (14), The upper part of the core box is provided with a core box left cover plate (9) and a core box right cover plate (10). 5. A sand mold for casting long arm castings according to claim 4, characterized in that: a core box lock is provided at the end of the core box coaming (11) at one end of the sand filling port (12) Tight structure (13), core box coaming (11) outside is provided with weight-reducing groove (15).