CN115673239A

CN115673239A - Casting process of avoiding groove of steering machine with lower protective support

Info

Publication number: CN115673239A
Application number: CN202211233240.7A
Authority: CN
Inventors: 鲁永忠
Original assignee: DONGFENG FORGING CO LTD
Current assignee: DONGFENG FORGING CO LTD
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2023-02-03

Abstract

The invention discloses a casting process of an avoidance groove of a steering engine with a lower protective support, which comprises the following steps: and manufacturing the semi-suspended sand core according to the size of the avoidance groove of the steering engine on the lower protective support. Has the advantages that: the invention uses the moulding process of the semi-suspended sand core of the mould, fully utilizes the extrusion effect of the moulding sand, tightly fixes the sand core in the moulding sand, and tightly attaches the sand core to the mould, so that the sand core carries out self-positioning correction, thereby ensuring the shape and the size of a casting, reducing the fit clearance between the sand core and the moulding sand, leading the burr of the casting to be very small, improving the processing quality of the avoiding groove, simultaneously leading the shape and the position of the sand core to be fundamentally changed by changing the positioning mode of the sand core, reducing the weight of the sand core, realizing the burr-free casting of the reinforcing rib, meeting the appearance requirement of the casting, shortening the manufacturing time of the avoiding groove and improving the processing efficiency of the avoiding groove.

Description

Casting process of avoiding groove of steering machine with lower protective support

Technical Field

The invention relates to the technical field of casting industry, in particular to a casting process of an avoidance groove of a lower protective support steering engine.

Background

At present, when a steering machine avoidance groove is processed on a protective support on an automobile steering mechanism, a lower core method and a machining method are generally adopted: when the lower mold and the lower mold are used for manufacturing the mold, positioning core heads are made on the upper mold and the lower mold, parts such as an avoidance groove, an upper core head and a lower core head are made by using the sand core, the sand core is put into the mold cavity at a lower core working section after the mold is manufactured, and the avoidance groove is formed after the mold is closed and cast; the machining method is to directly and mechanically form an avoiding groove on the protective support.

When a lower-mold core setting method is adopted for processing, in order to ensure that the sand core can be set in place and the sand is not wiped when the core is set, the problems of large fit clearance between the sand core and molding sand, large casting burr, difficult cleaning of the burr near the reinforcing rib and the like exist, only a small pneumatic tool can be used for cleaning, the efficiency is low, the cleaning is not clean, the appearance burr standard is difficult to reach, the reinforcing rib is not in neat butt joint, the strength is influenced, and the service life of the part is shortened; the avoidance groove is machined by a machining method, machining procedures are increased, multiple layers of machining are needed, machining efficiency is low, the risk that parts are scrapped due to the fact that shrinkage holes are increased in the casting avoidance groove is caused, and therefore the problem is solved by urgently needing a casting technology of the avoidance groove of the lower protection support steering machine.

Disclosure of Invention

The invention aims to provide a casting process of an avoidance groove of a lower protective support steering engine, aiming at solving the problems.

The invention achieves the above purpose through the following technical scheme:

the casting process of the avoidance groove of the lower protective support steering engine comprises the following casting steps:

step 1: manufacturing a semi-suspended sand core according to the size of a steering engine avoidance groove on the lower protective support;

step 2: hanging the manufactured semi-suspended sand core on a lower casting mold on a lower protective support;

and 3, step 3: the sand core and the corresponding casting mould are sent into a host machine for molding, and the sand core is embedded into the molding sand;

and 4, step 4: and (3) performing mould assembling and pouring on the placed casting mould, and manufacturing a steering engine avoiding groove on the finally cast lower protection support.

Furthermore, when the sand core in the step 1 is used, in order to ensure that the position of the sand core is not changed in the process of rotating the template, a raised edge structure is designed on the sand core so as to conveniently fix the sand core on the strut, and experiments prove that the over-thick raised edge lower molding sand cannot be compacted and is easy to generate the defects of fleshiness, sand holes and the like, so that the over-thick raised edge of the sand core is avoided when the design is adopted; meanwhile, selecting a proper fit clearance and a proper extension edge between the sand core and the molding sand to prevent the hollow part of the sand mold from being separated; and moreover, when the sand core is designed, the stress of the sand core is concentrated on the top of the sand core and borne by the top of the support column, so that the sand core is guaranteed to bear high-strength impact force during molding.

Furthermore, inlay the psammitolite in the molding sand in step 3 and can form the casting die cavity between psammitolite and molding sand to realize that the mould assembling forms and dodges the groove after pouring.

Furthermore, a part of the upper circle of the steering engine strut for suspending the sand core needs to be cut off, so that subsequent convenient demoulding of the sand core is facilitated.

The invention has the beneficial effects that:

the invention uses the moulding process of the semi-suspended sand core of the mould, fully utilizes the extrusion effect of the moulding sand, tightly fixes the sand core in the moulding sand, and tightly attaches the sand core to the mould, so that the sand core carries out self-positioning correction, thereby ensuring the shape and the size of a casting, reducing the fit clearance between the sand core and the moulding sand, leading the burr of the casting to be very small, improving the processing quality of the avoiding groove, simultaneously leading the shape and the position of the sand core to be fundamentally changed by changing the positioning mode of the sand core, reducing the weight of the sand core, realizing the burr-free casting of the reinforcing rib, meeting the appearance requirement of the casting, shortening the manufacturing time of the avoiding groove and greatly improving the processing efficiency of the avoiding groove.

Drawings

FIG. 1 is a flow chart of a casting process of an avoidance groove of a steering engine of a lower protective support saddle;

FIG. 2 is a schematic structural diagram of a sand core in the casting process of the avoidance groove of the lower protection support steering machine.

Detailed Description

and 2, step: hanging the manufactured semi-suspended sand core on a lower casting mold on a lower protective support;

and step 3: the sand core and the corresponding casting mould are sent into a host machine together for molding, and the sand core is inlaid in the molding sand;

In the embodiment, in order to ensure that the position of the sand core is not changed in the process of rotating the template when the sand core in the step 1 is used, a raised edge structure is designed on the sand core so as to conveniently fix the sand core on the strut, and experiments prove that the sand core under the excessively thick raised edge cannot be compacted, and the defects of fleshiness, sand holes and the like are easily generated, so that the excessively thick raised edge of the sand core is avoided when the design is adopted; meanwhile, selecting a proper fit clearance and a proper extension edge between the sand core and the molding sand to prevent the hollow part of the sand mold from being separated; and moreover, when the sand core is designed, the stress of the sand core is concentrated on the top of the sand core and borne by the top of the support column, so that the sand core is guaranteed to bear high-strength impact force during modeling.

In this embodiment, inlay the psammitolite in the molding sand in step 3 can form the casting die cavity between psammitolite and molding sand to form and dodge the groove after realizing the mould assembling and pouring.

In this embodiment, the circle of the steering engine pillar for suspending the sand core needs to be partially cut off to facilitate subsequent convenient demolding of the sand core.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The casting process of the avoidance groove of the lower protective support steering engine is characterized in that: the method comprises the following casting steps:

and step 3: the sand core and the corresponding casting mould are sent into a host machine for molding, and the sand core is embedded into the molding sand;

2. The casting process of the lower protective support steering engine avoiding groove as claimed in claim 1, wherein: when the sand core in the step 1 is used, in order to ensure that the position of the sand core is not changed in the process of rotating the template, a raised edge structure is designed on the sand core so as to conveniently fix the sand core on the strut; meanwhile, selecting a proper fit clearance and a proper extension edge between the sand core and the molding sand to prevent the hollow part of the sand mold from being separated; and moreover, when the sand core is designed, the stress of the sand core is concentrated on the top of the sand core and borne by the top of the support column, so that the sand core is guaranteed to bear high-strength impact force during molding.

3. The casting process of the lower protective support steering machine avoidance groove as claimed in claim 1, wherein: and 3, embedding the sand core into the molding sand, so that a casting cavity can be formed between the sand core and the molding sand.

4. The casting process of the lower protective support steering engine avoiding groove as claimed in claim 1, wherein: the circle of the steering engine support for suspending the sand core is partially cut off so as to facilitate the suspension of the sand core for demoulding.