Method for improving qualified rate of machine tool box body cast by evanescent mode process

Abstract

The invention belongs to the field of evanescent mode casting production, and particularly relates to a method for improving the qualification rate of a machine tool box body cast through an evanescent mode technology, the method comprises a machine tool box body and a method for improving the structure of the machine tool box body, and the machine tool box body comprises a box body, a box body cover, an improved new box body and a new box body cover; according to the method for improving the machine tool box body structure, a box body cover is divided into a large circular cavity part half box body cover and a small cavity part half box body cover; the large circular cavity part half box body cover is fixedly and correspondingly arranged above the large circular cavity part half box body of the box body, the large circular cavity part half box body cover and the box body form a new box body, and when a new box body model is molded by burying dry quartz sand through an evanescent mode process, the peripheral wall of the new box body model is not distorted and deformed; the small cavity part of the box body cover is a half box body cover, naturally becomes a new box body cover and is detachably and fixedly connected with a new box body. The percent of pass of casting the machine tool box body by adopting the evanescent mode process is improved; and the method has obvious economic benefits.

Description

Technical Field

[0001] The invention belongs to the field of lost foam casting production, and in particular relates to a method for improving the qualified rate of a lost foam casting machine tool box. Background Art

[0002] Casting is the main production process of metal forming. Among them, lost foam casting (also known as full mold casting) is a new casting method that combines foam models with similar size and shape to the casting into a model family, brushes refractory coating and dries it, buries it in dry quartz sand for vibration molding, pours it under negative pressure, gasifies the model, and the liquid metal occupies the position of the model. After solidification and cooling, it forms a casting. Compared with traditional casting, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited material and suitable for all sizes; 3. High dimensional accuracy, smooth surface, reduced cleaning, 4. Save machining; 5. Internal defects are greatly reduced and the organization is dense; 6. It can be suitable for castings with complex casting structures. 7. It can realize automated assembly line operation. 8. It can greatly improve the working environment, reduce labor intensity, and reduce energy consumption. Therefore, machine tool box castings have been improved from traditional sand casting to lost foam casting for many years. The machine tool box casting of the present invention is composed of two parts, a box body and a box cover. Since the internal structures of the box body and the box cover are relatively complex and the walls are thin, when the lost foam casting process is adopted, the box body and the box cover are very easy to deform during the above-mentioned "buried in dry quartz sand for vibration molding", especially the deformation of the surrounding wall of the box body is relatively serious, and the production efficiency is low. Therefore, it is necessary to adopt n rod-shaped models of different lengths to support horizontally in multiple directions on the inner side of the box model respectively, so as to improve the strength and rigidity of the box model when buried in dry quartz sand for vibration molding. However, despite such box model reinforcement measures, there is still a waste of lost foam raw materials, loss of work and time, and the qualified rate of casting products can only be 50%. In view of the above problems, how to improve the qualified rate of such machine tool box casting products using the lost foam casting process has become a research topic that needs to be improved. Summary of the invention

[0003] The present invention aims at the technical problems that the lost foam casting of the above-mentioned machine tool casing not only wastes lost foam raw materials, causes delays in work and time, but also the qualified rate of the casting products can only reach 50%, and provides a method for improving the qualified rate of the lost foam casting machine tool casing.

[0004] The present invention adopts the following technical solutions: A method for improving the qualified rate of a machine tool box body for lost foam casting, comprising a machine tool box body and a method for improving the structure of the machine tool box body, wherein the machine tool box body comprises a box body and a box body cover, and a new box body and a new box body cover after improving the structure of the box body and the box body cover; the bottom surface and the top surface of the box body are arranged in parallel, and a box body boundary wall is arranged perpendicularly to the bottom surface and the top surface between the middle bottom of the inner cavity and the top surface and between the inner side walls of the box body, the box body boundary wall divides the box body into a large circular cavity part half box body and a small cavity part half box body, the bottom surface of the box body cover is arranged in parallel with the top surface of the box body, the box body cover and the box body are provided with a large circular cavity part half box body cover and a small cavity part half box body cover correspondingly above and below, and the box body and the box body cover are detachably fixedly connected; The method for improving the machine tool box structure, the box cover extends along the curved surface of the box boundary wall on one side of the corresponding box body and the outer circular side wall of the half box body of the large circular cavity part to the outer walls of both sides of the box cover, and the box cover is separated into two parts: the half box cover of the large circular cavity part and the half box cover of the small cavity part; The half box cover of the large circular cavity part after the box cover is separated is fixedly arranged above the half box cover of the large circular cavity part of the box body, and forms a new box body with the box body; After the box cover is separated, the half box cover of the small cavity portion naturally becomes a new box cover, and is detachably fixedly connected to the new box; The improved new box body and the new box body cover are cast by the same lost foam process as the box body and the box body cover.

[0005] When the machine tool box body is cast by the lost foam process, the process of "burying the model of the new box body in dry quartz sand for vibration molding" no longer requires the use of n rod-shaped models of different lengths to perform horizontal support and reinforcement operations in multiple directions on the inner side of the new box body model, thereby simplifying the process of "burying the model of the box body in dry quartz sand for vibration molding" before improvement, and the cumbersome operation of supporting and reinforcing the box body model, which can ensure that the strength and rigidity of the new box body model when buried in dry quartz sand for vibration molding are much greater than those of the box body model, and the surrounding wall of the new box body model will not be twisted and deformed; compared with the box body cover cast by the lost foam process, the new box body cover is smaller in size, which can ensure the strength and rigidity of the new box body cover model when buried in dry quartz sand for vibration molding.

[0006] The present invention has the following beneficial effects: The invention improves the strength and rigidity of the casting model of the machine tool box casting using the lost foam process, and increases the qualified rate of the machine tool box casting from only 50% to 100%, greatly improves the production efficiency, reduces the production cost, and has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the box before improvement; Figure 2 This is a schematic diagram of the box cover before improvement; Figure 3 This is a schematic diagram of the box cover separation during improvement; Figure 4 This is a schematic diagram of the improved new cabinet; Figure 5 This is a schematic diagram of the improved new box cover; Figure 6 The figure is a schematic diagram of a machine tool case in which a new case and a new case cover are combined.

[0008] In the figure: 1-box, 2-box cover, 3-new box, 4-new box cover, 11-box boundary wall, 12-large circular cavity part and half box, 13-small cavity part and half box, 22-large circular cavity part and half box cover, 23-small cavity part and half box cover. DETAILED DESCRIPTION

[0009] The following is combined with Figure 1-6 The present invention is further illustrated by the following examples.

[0010] A method for improving the qualified rate of a machine tool box body for lost foam casting, comprising a machine tool box body and a method for improving the structure of the machine tool box body, wherein the machine tool box body comprises a box body 1 and a box body cover 2, and a new box body 3 and a new box body cover 4 after the structures of the box body 1 and the box body cover 2 are improved; the bottom surface and the top surface of the box body 1 are arranged in parallel, and a box body boundary wall 11 is arranged perpendicularly to the bottom surface and the top surface between the middle bottom of the inner cavity and between the inner side walls of the box body 1, and the box body boundary wall 11 divides the box body 1 into a large circular cavity part half box body 12 and a small cavity part half box body 13, the bottom surface of the box body cover 2 is arranged in parallel with the top surface of the box body 1, and the box body cover 2 and the box body 1 are provided with a large circular cavity part half box body cover 22 and a small cavity part half box body cover 23 correspondingly above and below, and the box body 1 and the box body cover 2 are detachably fixedly connected; The method for improving the machine tool box structure, the box cover 2 extends along the curved surface that coincides with the outer circular side wall of the large circular cavity part half box 12 on one side of the corresponding box boundary wall 11 in the box 1 to the outer walls on both sides of the box cover 2, and the box cover 2 is separated into two parts: the large circular cavity part half box cover 22 and the small cavity part half box cover 23; The large circular cavity half box cover 22 after the box cover 2 is separated and fixedly arranged above the large circular cavity half box 12 of the box 1, and forms a new box 3 with the box 1; After the box cover 2 is separated, the small cavity part half box cover 23 naturally becomes a new box cover 4, which is detachably fixedly connected to the new box 3.

[0011] When the machine tool box body is cast by the lost foam process, the process of "burying the model of the new box body 3 in dry quartz sand for vibration molding" no longer needs to adopt n rod-shaped models of different lengths to perform horizontal support and reinforcement operations in multiple directions on the inner side of the new box body 3 model, which simplifies the process of "burying the model of the box body 1 in dry quartz sand for vibration molding" before improvement, and the cumbersome operation of supporting and reinforcing the box body 1 model can ensure that the strength and rigidity of the new box body 3 model when buried in dry quartz sand for vibration molding are much greater than those of the box body 1 model, and the surrounding wall of the new box body model will not be twisted and deformed; compared with the box body cover 2 cast by the lost foam process, the new box body cover 4 is smaller in size, which can ensure the strength and rigidity of the new box body cover 4 model when buried in dry quartz sand for vibration molding.

[0012] In addition to this embodiment, all machine tool cases consisting of a case body and a case cover that adopt the method of improving the qualified rate of lost foam casting machine tool cases of the present invention belong to the protection scope of the present invention.

Claims

1. A method for improving the qualified rate of lost foam casting machine tool box, characterized in that: The invention comprises a machine tool box and a method for improving the structure of a machine tool box, wherein the machine tool box comprises a box (1) and a box cover (2), and a new box (3) and a new box cover (4) after the structure of the box (1) and the box cover (2) are improved; the bottom surface and the top surface of the box (1) are arranged in parallel, a box boundary wall (11) is arranged perpendicular to the bottom surface and the top surface between the middle bottom of the inner cavity and between the inner side walls of the box (1), the box boundary wall (11) divides the box (1) into a large circular cavity part half box (12) and a small cavity part half box (13), the bottom surface of the box cover (2) is arranged in parallel with the top surface of the box (1), the box cover (2) and the box (1) are provided with a large circular cavity part half box cover (22) and a small cavity part half box cover (23) above and below, and the box (1) and the box cover (2) are detachably fixedly connected; The method for improving the machine tool box structure, wherein the box cover (2) extends along a curved surface that coincides with the outer circular side wall of the large circular cavity part half box (12) on one side of the box boundary wall (11) in the corresponding box (1) to the outer walls on both sides of the box cover (2), and the box cover (2) is separated into two parts: the large circular cavity part half box cover (22) and the small cavity part half box cover (23); The large circular cavity half box cover (22) after the box cover (2) is separated is fixedly arranged above the large circular cavity half box (12) of the box (1) to form a new box (3) with the box (1); After the box cover (2) is separated, the small cavity part half box cover (23) naturally becomes a new box cover (4) and is detachably fixedly connected to the new box (3).

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