Technological method for improving wear resistance of block casting middle trough
Through 3D printing and overall casting methods, combining the design of diamond grid grooves and chain grooves, and laying a wear-resistant layer on their surface, the problems of easy breakage and wear resistance in the middle of the casting are solved, significantly improving wear resistance and service life, and reducing maintenance costs and impacts.
Patent Information
- Application Number
- CN202411980424.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-04-08
AI Technical Summary
The existing casting middle grooves are prone to fracture and wear resistance during work, which leads to frequent replacement or lifting and repairing, affecting production and increasing costs.
The whole cast middle groove is made by 3D printing and overall casting method, and diamond grid grooves and chain grooves are opened on its surface, and wear-resistant layers are set in these grooves, slopes are set on both sides, and rounded corners are set at the bottom. ZG28SiMnCr1NiMo material was used, and an wear-resistant layer was obtained by inner cladding overlay method.
It significantly improves the wear resistance of the middle groove in the casting, and its service life can reach 1-2 times that of the traditional casting groove, reducing the maintenance frequency and cost, and improving the overall performance and production efficiency of the equipment.
Smart Images
Figure CN119776720A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of coal mine machinery, and in particular relates to a process method for improving the wear resistance of a middle groove of an integral casting. Background Art
[0002] Scraper conveyor is the most frequently used equipment in coal mines. The middle trough is the main component of the scraper conveyor. At present, most of the middle troughs on the market are cast and welded structures. The manufacturing process is complicated. Not only does welding require a large number of welders and welding wires, but also the strength and wear resistance of each part are inconsistent due to inconsistent materials, poor welding performance, and prone to welding deformation, weld cracking and other problems. Although the traditional integrally cast middle trough solves the above problems, it is difficult to take into account excellent wear resistance, strength, weldability and impact toughness due to the high carbon content and alloy composition of the material. When it is impacted and bent during work, it causes problems such as casting fracture or wear resistance. It needs to be replaced or repaired by lifting the well, which not only affects normal production but also increases the cost of use.
[0003] Therefore, it is necessary to design a process method to improve the wear resistance of the middle groove of the whole casting to solve the above problems. Summary of the invention
[0004] The purpose of the present invention is to provide a process method for improving the wear resistance of the integrally cast middle groove, and the produced integrally cast middle groove has good welding performance, high toughness and high wear resistance. The problem of fracture and poor wear resistance of the integrally cast middle groove is solved, and the method has the advantages of diverse processability, good wear resistance and long service life.
[0005] To achieve the above-mentioned purpose, the present invention provides the following scheme: a process method for improving the wear resistance of the integrally cast middle groove, manufacturing the integrally cast middle groove by 3D printing and integral casting, opening a diamond grid groove and a chain groove on the integrally cast middle groove, arranging a wear-resistant layer in the diamond grid groove and the chain groove, setting a slope on both sides of the integrally cast middle groove, and setting a rounded corner at the bottom of the integrally cast middle groove.
[0006] Based on the process method of improving the wear resistance of the integrally cast middle groove of the present invention, the material of the integrally cast middle groove is ZG 28 SiMnCr1NiMo.
[0007] Based on the process method of improving the wear resistance of the middle groove of the integral casting of the present invention, ZG 28 The components of SiMnCr1NiMo are C: 0.22%-0.29%, Cr: 0.4%-0.8%, Ni: 0.4%-1.1%, Si: 0.9%-1.4%, Mn: 0.6%-1%, P: 0.01%-0.03%, S: 0.001%-0.005%, Mo: 0.1%-0.3%, and the rest is Fe.
[0008] According to a process method for improving the wear resistance of the middle groove of the integral casting of the present invention, during 3D printing and integral casting, first the mold is split and printed, then the positioning pins of the sand mold are assembled, and vertical casting is adopted during casting.
[0009] A process method for improving the wear resistance of the middle groove of the integral casting according to the present invention has a slope of 10°-15° and a radius of R3-R5.
[0010] According to a process method for improving the wear resistance of the middle groove of the integral casting of the present invention, the wear-resistant layer is obtained by an internal cladding and surfacing method.
[0011] According to a process method for improving the wear resistance of the integrally cast middle groove of the present invention, the wear-resistant layer is wear-resistant welding wire or alloy powder.
[0012] According to the process method for improving the wear resistance of the integrally cast middle groove of the present invention, the hardness of the wear-resistant layer is higher than HRC60.
[0013] Based on a process method for improving the wear resistance of the integrally cast middle groove of the present invention, the wear-resistant layer thickness of the chain groove is 8mm-10mm higher than the plane of the integrally cast middle groove.
[0014] Based on a process method for improving the wear resistance of the integrally cast middle groove of the present invention, the thickness of the wear-resistant layer of the diamond grid groove is 4mm-5mm higher than the plane of the integrally cast middle groove.
[0015] Compared with the prior art, the present invention has the following advantages and technical effects:
[0016] Through the friction and wear test of the whole cast middle trough with wear-resistant layer, the wear resistance can be increased to more than 3 times, and the service life is 1-2 times that of the traditional whole cast trough, which greatly saves the use cost, reduces the maintenance time of coal mine underground, and has high coal flow and production efficiency; improves the overall performance of the scraper conveyor equipment. The whole cast middle trough has high wear resistance, high strength, corrosion resistance and weldability. Its tensile strength reaches more than 1200MPa, and its wear resistance is more than 2 times that of imported wear-resistant plates. After the grinding layer, the contact area between the scraper and the middle plate is effectively reduced, and the coal powder gathered between the wear-resistant layer plays a lubricating role, which significantly reduces the friction resistance of the scraper, makes the equipment run smoothly, the noise is small, saves about 20%-30% of energy consumption, and increases the service life of the chain. The surface of the whole cast middle trough is smooth, the outline is clear and beautiful. It is mass-produced using professional molds and corrected by professional equipment to ensure product size consistency and interchangeability. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:
[0018] Figure 1 Schematic diagram of the middle groove of the whole casting.
[0019] Among them, 1. Integrally cast middle groove; 2. Diamond grid groove; 3. Chain groove. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0022] Reference Figure 1 As shown, the present invention provides a process method for improving the wear resistance of the integrally cast middle groove, the integrally cast middle groove 1 is manufactured by 3D printing and integral casting, a diamond grid groove 2 and a chain groove 3 are opened on the integrally cast middle groove 1, a wear-resistant layer is arranged in the diamond grid groove 2 and the chain groove 3, a slope is arranged on both sides of the integrally cast middle groove 1, and a fillet is arranged at the bottom of the integrally cast middle groove 1.
[0023] Furthermore, the material of the integrally cast middle groove 1 is ZG 28 SiMnCr1NiMo.
[0024] Furthermore, ZG 28 The components of SiMnCr1NiMo are C: 0.22%-0.29%, Cr: 0.4%-0.8%, Ni: 0.4%-1.1%, Si: 0.9%-1.4%, Mn: 0.6%-1%, P: 0.01%-0.03%, S: 0.001%-0.005%, Mo: 0.1%-0.3%, and the rest is Fe.
[0025] Furthermore, during 3D printing and integral casting, the mold is first printed separately, and then the positioning pins of the sand mold are assembled, and vertical casting is adopted during casting.
[0026] Furthermore, the slope is 10°-15° and the radius is R3-R5.
[0027] By setting the slope and fillet, on the one hand, it is convenient to demould, and on the other hand, the fusion effect of the root of the cladding metal is improved to improve the bonding strength.
[0028] Furthermore, the wear-resistant layer is obtained by an internal cladding and surfacing method.
[0029] Furthermore, the wear-resistant layer is wear-resistant welding wire or alloy powder.
[0030] Furthermore, the hardness of the wear-resistant layer is higher than HRC60.
[0031] Furthermore, the wear-resistant layer thickness of the chain groove 3 is 8 mm to 10 mm thicker than the plane of the integrally cast middle groove 1 .
[0032] Furthermore, the wear-resistant layer thickness of the diamond grid groove 2 is 4 mm to 5 mm thicker than the plane of the integrally cast middle groove 1 .
[0033] The present invention develops an integral middle slot material with good welding performance, and utilizes the advantages of 3D sand core printing integral casting to cast the chain path position into a groove shape, and to cast a diamond grid groove at other positions. The arc surfacing, plasma cladding surfacing, and secondary molding casting methods can be used to improve the wear resistance of the integrally cast scraper. The present invention provides an integrally cast middle slot material with high wear resistance, high strength, high toughness, weldability, and corrosion resistance. Through the process of integral casting, a groove is pre-cast on the middle plate. Its structural characteristics can be utilized to lay materials with higher wear resistance by arc or plasma surfacing and secondary casting, further enhancing the wear resistance and service life of the integrally cast middle slot; using special high-strength wear-resistant alloy steel materials, it has high strength, high wear resistance, corrosion resistance, and weldability, which greatly saves the use cost, reduces the underground maintenance time of coal mines, and has high coal throughput and production efficiency; improves the overall performance of the scraper conveyor equipment.
[0034] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0035] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.
Claims
1. A process for improving the wear resistance of the middle groove of the integral casting, characterized in that: An integrally cast middle groove (1) is manufactured by 3D printing and integral casting methods, a rhombus grid groove (2) and a chain groove (3) are provided on the integrally cast middle groove (1), a wear-resistant layer is provided in the rhombus grid groove (2) and the chain groove (3), slopes are provided on both sides of the integrally cast middle groove (1), and a rounded corner is provided at the bottom of the integrally cast middle groove (1).
2. A process for improving the wear resistance of the integrally cast middle groove according to claim 1, characterized in that: The material of the integrally cast middle groove (1) is ZG 28 SiMnCr1NiMo.
3. A process for improving the wear resistance of the integrally cast middle groove according to claim 2, characterized in that: ZG 28 The components of SiMnCr1NiMo are C: 0.22%-0.29%, Cr: 0.4%-0.8%, Ni: 0.4%-1.1%, Si: 0.9%-1.4%, Mn: 0.6%-1%, P: 0.01%-0.03%, S: 0.001%-0.005%, Mo: 0.1%-0.3%, and the rest is Fe.
4. A process for improving the wear resistance of the integrally cast middle groove according to claim 1, characterized in that: During 3D printing and integral casting, first print the mold, then assemble the sand mold positioning pins, and use vertical casting for casting.
5. A process for improving the wear resistance of the integrally cast middle groove according to claim 1, characterized in that: The slope is 10°-15° and the corner radius is R3-R5.
6. A process for improving the wear resistance of the integrally cast middle groove according to claim 1, characterized in that: The wear-resistant layer is obtained by internal cladding and surfacing.
7. A process for improving the wear resistance of the integrally cast middle groove according to claim 6, characterized in that: The wear-resistant layer is wear-resistant welding wire or alloy powder.
8. A process for improving the wear resistance of the integrally cast middle groove according to claim 7, characterized in that: The hardness of the wear-resistant layer is higher than HRC60.
9. A process for improving the wear resistance of the integrally cast middle groove according to claim 1, characterized in that: The wear-resistant layer thickness of the chain groove (3) is 8 mm to 10 mm higher than the plane of the integrally cast middle groove (1).
10. A process for improving the wear resistance of the integrally cast middle groove according to claim 1, characterized in that: The wear-resistant layer thickness of the diamond grid groove (2) is 4 mm to 5 mm higher than the plane of the integrally cast middle groove (1).