Composite casting mould for casting metal round bar
By combining the casting mold with graphite inner tube and metal outer tube and combining the metal pad boss structure, the problems of difficulty in demolding and poor surface quality of the taperless casting mold are solved, and efficient production and long-life casting molds are achieved, suitable for high-demand special steels with high requirements and high temperature alloy round rods.
Patent Information
- Application Number
- CN202420936803.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The existing taperless casting molds are difficult to release when casting metal round rods, which easily strain the inner wall of the casting mold. The surface quality of the metal round rods is poor, has a short service life, and it takes time and effort to install and disassemble, which affects production efficiency.
The graphite inner tube and the metal outer tube are combined with the metal pad. The metal pad is equipped with a boss. The graphite inner tube is nested in the metal outer tube and placed on the metal pad boss. The wall thickness of the graphite inner tube is 1/3 of its inner diameter. ~1/4, the wall thickness of the metal outer tube is 1/3 to 1/4 of the inner diameter of the graphite tube, and the height of the metal pad boss is 1/4 to 1/5 of the inner diameter of the graphite tube, and the insulation and self-lubrication of graphite are used. The mold release and surface quality improvement are achieved.
It realizes simple installation of casting molds, easy demolding, high production efficiency, long mold life, and improves the surface and internal quality of metal round rods. It is suitable for high-demand special steels and high-temperature alloys.
Smart Images
Figure CN222175862U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of metallurgical casting, in particular to a composite casting mold for casting metal round bars. Background Art
[0002] In addition to the continuous casting and rolling process, the production of metal bars usually casts some special steels and special alloys into metal ingots first, and uses a tapered mold structure to facilitate demoulding. The cast metal ingots are then processed into bars by forging, extrusion, etc. With the development of multi-link remelting of some special alloys, such as vacuum self-consumable, electroslag remelting, etc., and some short-process processing technologies, such as direct casting of round bars, perforation, and then extrusion to produce pipes, the demand for direct casting of metal round bars using non-tapered molds is becoming more and more widespread.
[0003] There are generally two types of metal molds for casting non-tapered round bars. One is a tubular metal mold, which uses a through-diameter tube. This type of mold is difficult to demould due to its lack of taper, and generally requires a special device for ejecting the cast rods, which can easily damage the inner wall of the mold, and the surface quality of the cast metal round rods is also poor, and the service life of the metal mold is also short; the other is a combined mold, which uses two semicircular molds connected by bolts. Due to the presence of joints, the surface of the rod is prone to misalignment after casting, and sometimes requires machining. In addition, the installation and disassembly of the combined mold is time-consuming and labor-intensive, affecting production efficiency. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a composite casting mold for casting metal round bars, which comprises a graphite inner tube, a metal outer tube and a metal pad, wherein the metal pad is provided with a boss, and the graphite inner tube is nested in the metal outer tube and placed on the boss provided on the metal pad.
[0005] The wall thickness of the graphite inner tube is 1 / 3 to 1 / 4 of its inner diameter.
[0006] The metal outer tube is a steel tube or a cast iron tube, and the wall thickness is 1 / 3 to 1 / 4 of the inner diameter of the graphite tube.
[0007] The height of the metal pad boss is 1 / 4 to 1 / 5 of the inner diameter of the graphite tube.
[0008] Compared with the prior art, the utility model has the following advantages: the utility model has simple mold installation, easy demoulding of cast rods, no need for ejection device, high production efficiency, long mold life; the graphite inner tube has good thermal insulation, and improves the axial shrinkage compensation capacity of the mold, and the surface and internal quality of the cast metal round rod are good. The utility model is particularly suitable for casting various special steels, high-temperature alloy round rods, etc. with high surface quality requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The specific implementation modes of the present utility model are further described in detail below in conjunction with the accompanying drawings.
[0010] Figure 1 It is a structural schematic diagram of the utility model.
[0011] In the figure: 1 - graphite inner tube 2 - metal outer tube 3 - metal pad. DETAILED DESCRIPTION
[0012] like Figure 1 A composite casting mold for casting metal round rods, comprising a graphite inner tube 1, a metal outer tube 2 and a metal pad 3, wherein the metal pad 3 is provided with a boss, the graphite inner tube 1 is nested in the metal outer tube 2 and placed on the boss provided on the metal pad 3; the wall thickness of the graphite inner tube 1 is 1 / 3 to 1 / 4 of its inner diameter; the metal outer tube 2 is a steel tube or a cast iron tube, and the wall thickness is 1 / 3 to 1 / 4 of the inner diameter of the graphite tube; the height of the boss of the metal pad 3 is 1 / 4 to 1 / 5 of the inner diameter of the graphite tube.
[0013] When in use, the metal outer tube 2 is first heated to above 300°C to facilitate embedding the high-strength graphite inner tube 1, and the inner and outer tubes form a good transition fit. The graphite inner tube 1 has good thermal insulation at high temperatures, and the metal outer tube 2 does not need to be preheated during normal use. Taking advantage of the good thermal insulation of graphite at high temperatures, low thermal expansion coefficient, and self-lubrication, the cooled metal casting rod can be easily removed, and the metal casting rod has good surface quality. The casting mold only needs to replace the graphite inner tube 1 regularly.
[0014] The above are preferred implementation modes of the present invention. Technicians in the field to which the present invention belongs can also change and modify the above implementation modes. Therefore, the present invention is not limited to the above specific implementation modes. Any obvious improvements, substitutions or modifications made by technicians in this field on the basis of the present invention belong to the protection scope of the present invention.
Claims
1. A composite casting mold for casting metal round bars, characterized in that: It comprises a graphite inner tube (1), a metal outer tube (2) and a metal pad (3), wherein the metal pad (3) is provided with a boss, and the graphite inner tube (1) is nested in the metal outer tube (2) and placed on the boss provided on the metal pad (3).
2. A composite casting mold for casting a metal round bar according to claim 1, characterized in that: The wall thickness of the graphite inner tube (1) is 1 / 3 to 1 / 4 of its inner diameter.
3. A composite casting mold for casting a metal round bar according to claim 1, characterized in that: The metal outer tube (2) is a steel tube or a cast iron tube, and the wall thickness is 1 / 3 to 1 / 4 of the inner diameter of the graphite tube.
4. A composite casting mold for casting a metal round bar according to claim 1, characterized in that: The height of the boss of the metal pad (3) is 1 / 4 to 1 / 5 of the inner diameter of the graphite tube.