CN109290523B - Method for processing and manufacturing small-caliber high-pound-grade valve body integral sand core - Google Patents

Abstract

The invention discloses a method for processing and manufacturing a small-caliber high-pound-grade valve body integral sand core, which comprises the steps of placing a sand block I in a sand surrounding frame, filling sand into the sand surrounding frame, wherein the sand filling height is the same as the height of the sand surrounding frame, removing the sand surrounding frame after the sand is hardened, processing the sand block I, and processing a lower core box; and then sleeving a sand enclosing frame on the upper plane of the processed lower core box sand block I, wherein the size of an inner frame of the sand enclosing frame exceeds the maximum outline size of the sand core, the height of the sand enclosing frame exceeds half of the height of the sand core, filling sand into the sand enclosing frame and the lower core box, the sand filling height is parallel and level to the upper plane of the sand enclosing frame, removing the sand enclosing frame after the sand is hardened, processing the sand block II, processing the outline shape of the upper sand core, and taking out the whole sand core from the lower core box after the processing is finished to finish the manufacture of the whole sand core. The invention ensures that the sand core has an integral structure without gaps, the size of the inner cavity is accurate after the casting is formed, no batch gaps exist, and the workload of repairing the batch gaps and polishing is reduced.

Description

Method for processing and manufacturing small-caliber high-pound-grade valve body integral sand core

Technical Field

The invention relates to the field of resin sand casting, in particular to a method for processing and manufacturing a small-caliber high-pound-grade valve body integral sand core.

Background

A manufacturing method of a traditional small-caliber high-pound-grade valve body sand core comprises the following steps: the open core box mould is generally of a half structure and is divided into an upper core box and a lower core box, sand is filled in the upper core box and the lower core box respectively for core making, after sand is hardened, the upper core and the lower core are taken out respectively, and then the upper core and the lower core are bonded together by using special core bonding glue for casting. The second method comprises the following steps: the core box opening mold is of a half structure, namely the core box mold is composed of two halves, the two half core boxes are provided with locking devices, the two half core box molds are locked before sand filling and core making, sand is filled from the core head opening position of the head part of the core box sand core, after the sand is hardened, the locking devices of the two half core boxes are loosened, the whole sand core is taken out, then the two half core box molds are locked again, and the next group of sand cores are waited to be manufactured.

The prior method, namely a core making method, has the following defects: the sand core is divided into an upper sand core and a lower sand core, then the two half sand cores are bonded together, the split surfaces of the upper sand core and the lower sand core have gaps after bonding, and the sand core is an inner cavity structure for forming a casting, so that the inner cavity has a flash after the casting is formed, and the flash of the finished and polished casting is difficult to remove because the caliber of a valve body is small, thereby not only influencing the casting quality and the casting attractiveness, but also increasing the polishing workload.

The core making method of the prior method II has the following defects: the sand core box is formed by combining two half core boxes together by using a locking device, sand is filled from the opening position of the core head, and the sand filling opening is small, so that the sand filling is not easy to compact. According to the requirement of casting technology, when special sand is required to be placed at a local position in a core box, the special sand cannot be placed at a specified position, and only the special sand can be used for replacing common resin sand to make a core, so that the special sand is expensive and the core making cost is high.

Aiming at the defects of the prior art, the invention aims to provide a method for processing and manufacturing the integral sand core of the small-caliber high-pound-grade valve body, which ensures that the sand core has an integral structure and no gap, ensures that the size of an inner cavity after a casting is formed is accurate and has no batch gap, and reduces the workload of repairing the batch gap and polishing.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for processing and manufacturing an integral sand core of a small-caliber high-pound-grade valve body aiming at the technical current situation.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a method for processing and manufacturing an integral sand core of a small-caliber high-pound-grade valve body comprises the following steps:

the method comprises the following steps: firstly, placing a sand block I in a sand surrounding frame, wherein the size of an inner frame of the sand surrounding frame exceeds the maximum outline size of a sand core, the height of the sand surrounding frame exceeds half of the height of the sand core, filling sand into the sand surrounding frame, the sand filling height is the same as the height of the sand surrounding frame, removing the sand surrounding frame after the sand is hardened, then processing the sand block I, and processing a lower core box;

step two: the method comprises the steps of sleeving a sand enclosing frame on a machined lower core box sand block I, enabling the size of an inner frame of the sand enclosing frame to exceed the maximum outline size of a sand core, enabling the height of the sand enclosing frame to exceed the half height of the sand core, filling sand into the sand enclosing frame and the lower core box, enabling the sand filling height to be parallel to the upper plane of the sand enclosing frame, removing the sand enclosing frame after sand hardening is waited, machining a sand block II, machining the outline shape of the upper sand core, taking out the whole sand core from the lower core box after machining is finished, and finishing the manufacturing of the whole sand core.

The invention has the beneficial effects that: the invention does not need a core box opening die, and directly applies a three-dimensional graph and a program to process the integral sand core. If the shape or the process is changed, the three-dimensional graph and the program file are directly modified, and compared with the die modification, the die modification is more convenient. Compared with the traditional method I, the whole sand core processed and manufactured has no gap and is complete. The inner cavity of the formed casting blank has no batch seams, and the flash does not need to be polished, so that the polishing workload is reduced; compared with the traditional method II, the special sand can be placed at the designated position of the process requirement by the manufactured sand core, and the size of the manufactured integral sand core is more accurate.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments.

A method for processing and manufacturing an integral sand core of a small-caliber high-pound-grade valve body comprises the following steps: the method comprises the following steps: firstly, placing a sand block I in a sand surrounding frame, wherein the size of an inner frame of the sand surrounding frame exceeds the maximum outline size of a sand core, the height of the sand surrounding frame exceeds half of the height of the sand core, filling sand into the sand surrounding frame, the sand filling height is the same as the height of the sand surrounding frame, removing the sand surrounding frame after the sand is hardened, then processing the sand block I, and processing a lower core box;

step two: the method comprises the steps of sleeving a sand enclosing frame on a machined lower core box sand block I, enabling the size of an inner frame of the sand enclosing frame to exceed the maximum outline size of a sand core, enabling the height of the sand enclosing frame to exceed the half height of the sand core, filling sand into the sand enclosing frame and the lower core box, enabling the sand filling height to be parallel to the upper plane of the sand enclosing frame, removing the sand enclosing frame after sand hardening is waited, machining a sand block II, machining the outline shape of the upper sand core, taking out the whole sand core from the lower core box after machining is finished, and finishing the manufacturing of the whole sand core.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope defined by the claims.

Claims (1)

1. A method for processing and manufacturing an integral sand core of a small-caliber high-pound-grade valve body is characterized by comprising the following steps of:

the method comprises the following steps: firstly, placing a sand block I in a sand surrounding frame, wherein the size of an inner frame of the sand surrounding frame exceeds the maximum outline size of a sand core, the height of the sand surrounding frame exceeds half of the height of the sand core, filling sand into the sand surrounding frame, the sand filling height is the same as the height of the sand surrounding frame, removing the sand surrounding frame after the sand is hardened, then processing the sand block I, and processing a lower core box;

step two: the method comprises the steps of sleeving a sand enclosing frame on a machined lower core box sand block I, enabling the size of an inner frame of the sand enclosing frame to exceed the maximum outline size of a sand core, enabling the height of the sand enclosing frame to exceed the half height of the sand core, filling sand into the sand enclosing frame and the lower core box, enabling the sand filling height to be parallel to the upper plane of the sand enclosing frame, removing the sand enclosing frame after sand hardening is waited, machining a sand block II, machining the outline shape of the upper sand core, taking out the whole sand core from the lower core box after machining is finished, and finishing the manufacturing of the whole sand core.