CN206435720U - A kind of casting core box manufactured for rail truck core - Google Patents

Abstract

The utility model relates to a casting core box used for manufacturing sand cores of railway vehicles. It includes: an outer frame, an inner core box arranged in the outer frame; wherein, the contact surface between the outer frame and the inner core box is a wooden structure; the inner core box includes: a cavity with an opening retracted, and the cavity There is a sand core support inside; the sand core support is an inverted V-shaped structure, and its two ends are respectively supported on the inner wall of the cavity by side plates; an upward protrusion is provided at the center of the bottom of the cavity. The core box is made of plastic material and 3D printing technology. The plastic material includes nylon, photosensitive resin or PLA. The outer frame of the core box is still made of wood or metal, which can simplify the process, shorten the core box manufacturing cycle, and improve the efficiency of trial production. And it is easy to repair the mold, the workload of mold repair is small, the cost of mold repair is low, the change or replacement of the local structure of the core box is convenient and quick, the core box has good wear resistance, high dimensional accuracy, and the overall cost is low.

Description

A foundry core box for the manufacture of sand cores for railway vehicles

technical field

The utility model relates to a casting core box, which belongs to the field of railway equipment, in particular to a casting core box used for manufacturing sand cores of railway vehicles.

Background technique

During the trial production and production process of steel castings for railway vehicles, it is first necessary to design and manufacture casting core boxes for making sand cores. The casting core box is generally composed of an outer frame and an inner core box through assembly. The traditional casting core box is mostly made of all metal (both the outer frame and the inner core box are made of metal), and a small amount is made of all wood (the outer frame and the inner core box are both made of metal). Made of wood). Traditional casting core boxes have the following disadvantages:

(1) The manufacture of metal core boxes generally requires processes such as billet casting, heat treatment, and machining. The manufacture of wooden core boxes generally requires CNC machining, resulting in a longer manufacturing cycle for core boxes (a set of metal core boxes for railway steel castings generally requires 7 to 15 days), the product trial production cycle is long, the core box is partially repaired or replaced, and the overall cost is relatively high.

(2) It is difficult to repair the mold of the all-metal core box. If repeated mold repair is required, the workload of mold repair will be large and the cost of mold repair will be high.

(3) If there is only a small change in the product structure, it is inconvenient to change or replace the local structure on the core box, because the local structure still requires cumbersome processing.

(4) The wooden core box has poor wear resistance and low dimensional accuracy, especially the inner core box, because it is often in contact with the core sand, if it is made of wood, it will wear faster.

3D printing technology, due to its many advantages such as rapid manufacturing, moldless molding, rich molding materials, and complex molding structures, is in the ascendant in the industrial and technological circles and will have a major impact on traditional manufacturing. At present, 3D printing technology has achieved some applications in casting, such as printing casting sand cores, printing precision casting prototype parts made of plastic materials, etc.

Based on the characteristics of the casting production of railway steel castings, considering the long production cycle of the core box and the difficulty of partial repair or replacement, it is proposed to introduce 3D printing technology into the sand core manufacturing process of railway steel castings, that is, in the new railway steel castings. In the process of product trial production, 3D printing technology is used to make casting core boxes with plastic materials, which are used in the manufacture of sand cores for steel castings.

Utility model content

The utility model mainly solves the problems existing in the prior art such as cumbersome process of all-metal core boxes, long manufacturing cycle, difficult mold repair, inconvenient local structure modification or replacement, poor wear resistance of all-wood core boxes, and low dimensional accuracy. A foundry core box for the manufacture of sand cores for railway vehicles is presented. The core box is made of plastic material and 3D printing technology. The plastic material includes nylon, photosensitive resin or PLA. The outer frame of the core box is still made of wood or metal, which can simplify the process, shorten the core box manufacturing cycle, and improve the efficiency of trial production. And it is easy to repair the mold, the workload of mold repair is small, the cost of mold repair is low, the change or replacement of the local structure of the core box is convenient and quick, the core box has good wear resistance, high dimensional accuracy, and the overall cost is low.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions:

A casting core box for manufacturing sand cores for railway vehicles, comprising: an outer frame and an inner core box arranged in the outer frame; wherein, the contact surface between the outer frame and the inner core box is a wooden structure;

The inner core box includes: a cavity with an opening retracted, and a sand core support is arranged inside the cavity; the sand core support is an inverted V-shaped structure, and its two ends are respectively supported in the cavity by side plates on the wall;

An upward protrusion is provided at the center of the bottom of the cavity.

Optimally, the above-mentioned casting core box for the manufacture of railway vehicle sand cores, the opening of the cavity is provided with an inward reducing section; the top of the protrusion is in the shape of an arc surface, and the bottom of the The cross-section is rectangular; and the bottom of the protrusion is in contact with the first step surface arranged horizontally at the bottom of the cavity, and the edge of the first step surface extends longitudinally downwards and then meets one end of the first arc bottom of the bottom; The first arc bottom extends upwards from the side connecting with the first step surface and then connects with the side wall of the cavity.

Optimally, in the aforementioned casting core box for manufacturing sand cores for railway vehicles, the solution of the center of the first arc bottom is 90 degrees.

Optimally, in the aforementioned foundry core box for manufacturing sand cores for railway vehicles, a core cover is arranged inside the cavity.

Optimally, the aforementioned foundry core box for manufacturing sand cores for railway vehicles, the inner core box includes one or more of a nylon layer, a photosensitive resin layer, and a PLA material layer.

Therefore, the utility model has the following advantages: 1. The adoption of 3D printing rapid prototyping technology can simplify the process, greatly shorten the core box manufacturing cycle (the plastic module can be delivered within 4 days), and improve the efficiency of trial production; 2. Due to the adoption of Plastic material, easy mold repair, small mold repair workload, low mold repair cost; convenient and quick change or replacement of the core box local structure; 3. The core box has good wear resistance and high dimensional accuracy; the overall cost of core box manufacturing is low .

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model.

detailed description

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings. In the figure, the inner core box 1, the outer frame 2, the cavity 101, the sand core frame 102, the side plate 103, the protrusion 104, the variable diameter section 105, the first step surface 106, the first arc bottom 107, and the core cover 108.

Example:

A casting core box used for manufacturing sand cores for railway vehicles, comprising: an outer frame 2, and an inner core box 1 arranged in the outer frame 2; wherein, the contact surface between the outer frame 2 and the inner core box 1 is a wooden structure;

The inner core box 1 includes: a cavity 101 with an opening retracted, and a sand core frame 102 is arranged inside the cavity 101; the sand core frame 102 is an inverted V-shaped structure, and its two ends are respectively supported in the cavity by side plates 103 101 on the inner wall;

An upward protrusion 104 is provided at the center of the bottom of the cavity 101 .

A core cover 108 is disposed inside the cavity 101 . The opening of the cavity 101 is provided with an inward reducing section 105; the top of the protrusion 104 is an arc shape, and the cross-section of the bottom is rectangular; The step surface 106 is connected, and the edge of the first step surface 106 extends longitudinally downwards and then meets one end of the first arc bottom 107 at the bottom; the first arc bottom 107 extends upward from the side connecting with the first step surface 106 Then connect to the side wall of the cavity. The solution of the center of the first arc bottom 107 is 90 degrees.

The inner core box 1 includes one or more of a nylon layer, a photosensitive resin layer, and a PLA material layer.

After adopting the above structure, in the process of designing the core box of railway steel castings, the outer frame of the core box can be made of wood or metal materials, while the inner core box that determines the shape, size and surface roughness of the sand core is made of plastic material, and adopts Made with 3D printing technology. Factors such as the maximum size of the current 3D printing processed plastic parts should be considered to determine how the inner core box is divided into blocks and the shape and size of each module. Afterwards, the entire core box is manufactured in two parts. The outer frame is made of wood, and the inner core box is made of 3D printed plastic materials. The plastic materials include nylon, photosensitive resin and PLA. The rigidity, wear resistance, corrosion resistance and The surface finish of 3D printed parts meets the requirements of casting production. Among them, the maximum size of nylon material currently printed is 500×500×400mm, the current maximum size of photosensitive resin material is 450×450×350mm, and the maximum size of PLA material is currently printed. 1000×1000×1000mm. The maximum size of each plastic material will increase with the continuous development of 3D printing technology.

After the inner core box 1 and the outer frame 2 are respectively processed, they can be assembled to form a complete set of side frame small pedestal core boxes.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Although this paper uses the figure more often, the inner core box 1, the outer frame 2, the cavity 101, the sand core support 102, the side plate 103, the protrusion 104, the variable diameter section 105, the first stage surface 106 phase, the second phase An arc bottom 107, core cover 108 and other terms, but the possibility of using other terms is not excluded. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims (6)

1. A foundry core box for railway vehicle sand core manufacturing, characterized in that, comprising: an outer frame (2), an inner core box (1) arranged in the outer frame (2); wherein, the outer frame (2) The contact surface with the inner core box (1) is a wooden structure. 2. A casting core box for the manufacture of railway vehicle sand cores according to claim 1, characterized in that, The inner core box (1) includes: a cavity (101) with an opening retracted, and a sand core support (102) is arranged inside the cavity (101); the sand core support (102) is an inverted V-shaped structure, the two ends of which are respectively supported on the inner wall of the cavity (101) by side plates (103); An upward protrusion (104) is provided at the center of the bottom of the cavity (101). 3. A casting core box for the manufacture of railway vehicle sand cores according to claim 2, characterized in that, the opening of the cavity (101) is provided with an inward variable diameter section (105); The top of the protrusion (104) is in the shape of an arc, and the cross-section of the bottom is rectangular; and the bottom of the protrusion (104) is in contact with the first step surface (106) arranged horizontally at the bottom of the cavity (101) , the edge of the first step surface (106) extends longitudinally downwards and connects with one end of the first arc bottom (107) of the bottom; The connected side extends upwards and connects with the side wall of the cavity. 4. A foundry core box for manufacturing sand cores for railway vehicles according to claim 3, characterized in that the center of the first arc bottom (107) is 90 degrees. 5. A foundry core box for manufacturing sand cores for railway vehicles according to claim 3, characterized in that a core cover (108) is arranged inside the cavity (101). 6. A casting core box for the manufacture of railway vehicle sand cores according to claim 1, wherein the inner core box (1) comprises one of a nylon layer, a photosensitive resin layer, and a PLA material layer or more.