CN205393455U - Shaft coupling foundry sand mould - Google Patents

Abstract

The utility model discloses a sand mold for shaft coupling casting, which relates to the technical field of casting molding. The utility model comprises an upper sand box, a lower sand box, a sprue, a gate and at least one cavity of a coupling casting. The sprue and the cavity are connected through a runner. There are two air outlets, a dark riser is arranged on the runner, and an inrunner is arranged between the dark riser and the cavity. The beneficial effect of the utility model is that the feeding effect is good and the production cost is low.

Description

Sand mold for coupling casting

technical field

The utility model relates to the technical field of casting molding, in particular to a sand mold for casting a coupling.

Background technique

Couplings belong to the category of general mechanical parts. They are used to connect two shafts (driving shaft and driven shaft) in different mechanisms to make them rotate together to transmit torque. They are commonly used parts in the machinery industry and are in great demand. , Most of them are cast into rough parts, and then processed.

Among them, sand casting is a casting method that produces castings in sand molds. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. Because the molding materials used in sand casting are cheap and easy to obtain, the casting mold is easy to manufacture, and it can adapt to single-piece production and batch production of castings. Therefore, it has always been the basic process in casting production.

In sand casting, because of its high strength, high density and good surface finish, the castings produced by resin sand have the advantages of high dimensional accuracy, clear external contour, compact structure, and high comprehensive quality of castings. At the same time, resin sand has good flow It is flexible, easy to tighten, adjustable demoulding time, high strength after hardening, and will not deform during the subsequent handling and box closing process. It is used in the casting production of couplings.

At present, the top riser is used to feed the sand mold of the coupling casting, which is prone to defects such as shrinkage porosity, air holes, and slag holes, and the cost of the casting blank is relatively high.

Utility model content

The technical problem to be solved by the utility model is to provide a sand mold for shaft coupling casting, which has good feeding effect and low production cost.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a sand mold for coupling casting, including an upper sand box, a lower sand box, a sprue, a gate and at least one coupling casting cavity , the sprue and the cavity are connected through the runner, and there are two air outlets vertically on the top of the cavity, and a dark riser is arranged on the runner, and an in-gate is provided between the dark riser and the cavity. road.

In a further technical solution, the air outlets are evenly distributed on the top of the cavity.

In a further technical solution, the runner is located at the interface between the upper flask and the lower flask, and is located on the upper flask.

In a further technical solution, the ingate is located at the interface between the upper flask and the lower flask, and is located on the lower flask.

In a further technical solution, a filter screen is provided between the sprue and the runner.

The beneficial effect produced by adopting the above-mentioned technical scheme is that: compared with the prior art, the utility model removes the top riser, adopts the vent hole to exhaust, adopts the dark riser to feed, and reduces the cost of the top riser during pouring. The amount of molten iron is high, the feeding effect is good, and the production cost is low.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the plan view of lower sand box in Fig. 1;

In the figure: 1. Cavity; 2. Inner runner; 3. Lower sand box; 4. Gate; 5. Sprue; 6. Cross runner; 7. Concealed riser; Put on the sandbox.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

The utility model takes HRC280F shaft coupling casting as an example, and describes the technical scheme adopted in detail.

The existing HRC280F coupling casting process is a box of two pieces, using two top risers (top riser diameter ∮ 90mm, height 100mm, single weight 4.3kg) and a dark riser for feeding (dark riser diameter ∮90mm, height 120mm, unit weight 5.2kg).

The utility model is an improvement to the existing casting process,

Referring to Fig. 1, it includes an upper sand box 9 and a lower sand box 3, two pieces in one box, the sprue 5 communicates with the cavity 1 through the runner 6, and there are two vertically arranged on the top of each cavity 1 A vent hole 8 is provided, and a dark riser 7 is arranged on the runner 6, and an inner runner 2 is provided between the dark riser 7 and each cavity 1.

Wherein, the top riser used in the prior art is removed, the air outlet holes 8 are evenly distributed on the top of the cavity 1, and the air outlet holes 8 are used to exhaust air during the pouring process.

Wherein, the runner 6 is located at the interface between the upper sand box 9 and the lower sand box 3, and is located on the upper sand box 9; the inner runner 2 is located at the interface between the upper sand box 9 and the lower sand box 3, and is located On the lower sand box 3. Such treatment makes the molten iron flow smoothly from high to low.

A filter screen is arranged between the sprue 5 and the runner 6, which can filter out the slag in the molten iron.

Among them, compared with the prior art, it has the following differences: 1. Two pieces in one box remain unchanged, the top riser in the process is removed, and two air outlets are respectively set on the top of each cavity, and the two parts are kept in the pouring process. Exhaust in the middle, which reduces the amount of molten iron;

2. The diameter of the dark riser is enlarged, and the diameter is adjusted from the original ∮90×120 to ∮100×130. The dark riser is used alone to feed the casting.

3. Strictly control the chemical composition of castings.

By adjusting the process and strictly controlling the composition, the produced coupling castings can fully meet the requirements of technical standards. Moreover, the amount of molten iron is reduced, the process yield is improved, and the production cost of a single piece is reduced. In this way, for mass-produced coupling castings, the overall production cost will be significantly reduced.

Claims (5)

1. A sand mold for coupling casting, comprising an upper sand box (9), a lower sand box (3), a sprue (5), a sprue and at least one coupling casting cavity (1), directly The runner (5) communicates with the cavity (1) through the runner (6), which is characterized in that two air outlets (8) are vertically provided on the top of the cavity (1), and the runner (6) ) is provided with a dark riser (7), and an inner sprue (2) is arranged between the dark riser (7) and the cavity (1). 2. A sand mold for coupling casting according to claim 1, characterized in that the air outlet holes (8) are evenly distributed on the top of the cavity (1). 3. A sand mold for coupling casting according to claim 1, characterized in that the runner (6) is located at the interface between the upper sand box (9) and the lower sand box (3), and is located On the sand box (9). 4. A sand mold for coupling casting according to claim 1, characterized in that the ingate (2) is located at the interface between the upper sand box (9) and the lower sand box (3), and is located On the lower sand box (3). 5. A sand mold for coupling casting according to claim 1, characterized in that a filter is provided between the sprue (5) and the runner (6).