CN215657699U

CN215657699U - Process structure for solving core drilling problem of molten iron by matching axle housing casting cores

Info

Publication number: CN215657699U
Application number: CN202121046467.1U
Authority: CN
Inventors: 王建东; 王东旭
Original assignee: Faw Forging Jilin Co ltd; FAW Group Corp; Faw Foundry Co Ltd
Current assignee: Faw Forging Jilin Co ltd; FAW Group Corp; Faw Foundry Co Ltd
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2022-01-28
Anticipated expiration: 2031-05-17

Abstract

The utility model relates to a process structure for solving the problem of molten iron core drilling by matching an axle housing casting core. Lightening holes are formed in the sand core of the axle housing casting core; and after the axle housing casting is molded, a sand tire is formed on the lower sand mold and is matched with the lightening holes of the sand core. A pit is arranged on a lower sand mold of the axle housing casting core, and a sand tire matched with the sand core is formed after molding; the sand tire is formed by molding green sand; and the fit clearance between the sand tire and the sand core lightening hole is 0 mm. The utility model relates to an axle housing casting, which adopts the structural design that the weight reduction part of a sand core is matched with the convex-concave part of a sand tire to prevent core drilling, has reasonable structural design and lower cost than the process of sand core plugging. The cost is reduced by more than half by using green sand; the structure of the utility model solves the problem of uneven wall thickness of the casting caused by sand holes and sand core not in place due to sand wiping when the core is put.

Description

Process structure for solving core drilling problem of molten iron by matching axle housing casting cores

Technical Field

The utility model relates to a casting method of an automobile axle housing, in particular to a process structure for solving the problem of core drilling of molten iron by matching an axle housing casting core.

Background

In actual production, molten iron is seriously drilled at positions of weight reducing blocks (refer to a sand core weight reducing block A2 and a sand core weight reducing block B4 in the figure 1) due to deformation and floating of the sand core, the sand core weight reducing blocks are plugged by the sand core manufactured additionally, the fit clearance is 0.1mm, and in order to prevent the fit sand core from falling off in the transportation process, gluing fixation is needed, so that the operation is troublesome and the cost is high.

CN202591552U discloses a three casting systems of V method casting axle housing one type, belongs to the machinery hot working field, solves the problem that current axle housing casting production efficiency is difficult to improve. The utility model relates to a V-method casting axle housing one-type three-piece pouring system, which consists of a sprue cup, a sprue, a cross gate, an ingate, a slag collecting ladle, a choke block, a riser and a slow flow vortex, wherein three axle housing models are arranged on a template side by side, the cross sections of the sprue, the cross gate and the ingate are respectively 40cm2, 58cm2 and 30cm2, the sprue cup, the sprue and the ingate are arranged on an upper template, the riser is arranged on two ends of the upper model and a large flange surface, the slow flow vortex, the cross gate, the slag collecting ladle and the choke block are arranged on a lower template, and the cross gate adopts a multi-stage type. The cross-sectional area and the structure of each pouring channel are reasonably designed, and the flow choking cross section, the slag collecting bag and the like are reasonably arranged, so that the pouring time of the one-type three-piece casting and the one-type two-piece casting is equal, the production efficiency of the axle housing is improved, and the pouring quality of the axle housing casting is ensured.

CN102896280B discloses a casting method of an automobile axle housing, which comprises the steps of firstly making cores and modeling to obtain a sand mold, then smelting to obtain molten iron, and finally pouring and cleaning to obtain an axle housing casting, wherein the proportion of sand mold raw materials is strictly controlled in the process of manufacturing the sand mold, so that the strength and the air permeability of an upper box, a lower box and a sand core are ensured; the melting temperature of the molten iron and the content of the components in the molten iron are strictly controlled, and the quality of the cast axle housing is ensured.

None of the above patents disclose a process or structure for preventing core drilling by using the convex-concave fit of the weight-reduced part of the sand core and the sand tire.

Disclosure of Invention

The utility model solves the problem of uneven wall thickness of a casting caused by sand holes and sand cores which are caused by sand wiping, and provides a process structure for solving the problem of core drilling of molten iron by matching a casting core of an axle housing.

In order to solve the technical problems, the utility model is realized by adopting the following technical scheme, which is described by combining the accompanying drawings as follows:

a process structure for solving the problem of core drilling of molten iron by matching an axle housing casting core is characterized in that a weight-reducing hole is formed in a sand core of the axle housing casting core;

and after the axle housing casting is molded, a sand tire is formed on the lower sand mold and is matched with the lightening holes of the sand core.

Further, a sand tire matched with the sand core is formed on the lower sand mold of the axle housing casting core.

Further, the sand tire is formed after molding by green sand.

Further, the fit clearance between the sand tire and the sand core lightening hole is 0 mm.

Furthermore, a core head for preventing the sand core from floating is arranged at an original shaft hole on a side flange of the axle housing casting.

Further, the wall thickness of the side flange is 30-36 mm.

Furthermore, a shaft hole with the diameter of 80mm is arranged on the side flange.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model relates to an axle housing casting, which adopts the structural design that the weight reduction part of a sand core is matched with the convex-concave part of a sand tire to prevent core drilling, has reasonable structural design and lower cost than the process of sand core plugging. The use of green sand reduces the cost by more than half. The structure of the utility model solves the problem of uneven wall thickness of the casting caused by sand holes and sand core under-position caused by sand wiping.

Drawings

FIG. 1 is a schematic view of an axle housing casting;

FIG. 2 is a perspective view of the sand core;

FIG. 3 is a cross-sectional view of a sand core;

FIG. 4 is a schematic view of a portion of a lower sand mold where a sand tire is formed;

in the figure:

1. a sand core;

2. a sand core lightening hole A;

3. a side flange A;

4. the shaft hole and the shaft hole core print A;

5. matching the sand core lightening holes with a sand tire A;

6. a sand core lightening hole B;

7. a side flange B;

8. a shaft hole and a shaft hole core print B;

9. and matching the sand core lightening holes with a sand core B.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model is described in detail below with reference to the attached drawing figures:

the utility model discloses a casting method of an automobile axle housing, in particular to a process structure for solving the problem of core drilling of molten iron by matching an axle housing casting core.

Firstly, the weight reduction design of the sand core is technically realized, so that the cost is reduced; in order to prevent molten iron from being drilled at the weight-reduced part, the sand tire matched with the weight-reduced part is designed in a lower mold, and a process design method for completely avoiding molten iron core drilling is provided.

The axle housing casting structure designed by the utility model is shown in figure 1, compared with the conventional casting, the axle housing casting structure is complex in structure, the main structure of the axle housing casting structure is similar to a box body with a downward opening, and the main wall thickness of a shell is 8-10 mm. The wall thickness of the side flange is 30-36mm, and only a shaft hole with the diameter of 80mm is arranged on the side flange and is used as a core head of the main sand control core drift. In the weight reduction design of the sand core 1 shown in the figures 1, 2 and 3, a sand core weight reduction hole A2 and a sand core weight reduction hole B6 are arranged, and a sand tire A5 matched with the sand core weight reduction hole and a sand tire B9 matched with the sand core weight reduction hole are arranged on the sand core.

The utility model cancels a matching sand core for blocking the lightening hole and is changed into a pit matched with the sand core on the lower pattern.

Referring to fig. 4, the sand tire of green sand produced after molding also blocks the position of a weight-reducing hole of a sand core, and the fit clearance is designed to be 0mm, so that the positioning is accurate while molten iron drilling is prevented, the original external fit clearance is increased, sand holes caused by contact with the sand tire during sand core discharging are reduced, and the cost of replacing the fit sand core with green sand is reduced by more than half.

At present, in order to prevent the core drilling of the casting, a shell type casting process adopts a process method of interference fit of a pattern core head and a sand core head, but the sand core is easy to touch a sand mould in the core setting process, so that the phenomena of sand wiping or not in place under the sand core are generated, and finally the defects of uneven sand hole, uneven wall thickness and the like of the casting are caused.

The process design of the utility model reduces the core matching of the defects of core drilling, sand holes and uneven wall thickness.

The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the utility model, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the utility model as defined by the appended claims. And those not described in detail in this specification are well within the skill of those in the art.

Claims

1. The utility model provides a process structure that axle housing foundry goods core cooperation was solved molten iron and is bored core which characterized in that:

lightening holes are formed in the sand core of the axle housing casting core;

2. The axle housing casting core cooperation of claim 1 solves iron water core drilling's process structure, its characterized in that:

and a sand tire matched with the sand core is formed on the lower sand mold of the axle housing casting core.

3. The axle housing casting core cooperation of claim 1 solves iron water core drilling's process structure, its characterized in that:

the sand tire is formed by molding green sand.

4. The axle housing casting core cooperation of claim 1 solves iron water core drilling's process structure, its characterized in that:

and the fit clearance between the sand tire and the sand core lightening hole is 0 mm.

5. The axle housing casting core cooperation of claim 1 solves iron water core drilling's process structure, its characterized in that:

the original axle hole position on the side flange of axle housing foundry goods has designed the core head that sand control core floats the core.

6. The axle housing casting core cooperation of claim 5 solves iron water core drilling's process structure, its characterized in that:

the wall thickness of the side flange is 30-36 mm.

7. The axle housing casting core cooperation of claim 5 solves iron water core drilling's process structure, its characterized in that:

and the side flange is provided with a shaft hole with the diameter of 80 mm.