CN213613376U - Hot extrusion molding system of stainless steel rail - Google Patents
Hot extrusion molding system of stainless steel rail Download PDFInfo
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- CN213613376U CN213613376U CN202022137890.4U CN202022137890U CN213613376U CN 213613376 U CN213613376 U CN 213613376U CN 202022137890 U CN202022137890 U CN 202022137890U CN 213613376 U CN213613376 U CN 213613376U
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Abstract
The utility model relates to a hot extrusion molding system of stainless steel rail, including machining equipment, firing equipment, lubricating arrangement, hot extrusion equipment, cold bed, thermal treatment equipment and quality inspection equipment, machining equipment, firing equipment, lubricating arrangement, hot extrusion equipment, cold bed, thermal treatment equipment and quality inspection equipment set gradually. The machining equipment comprises a lathe, a cutting machine and a polishing machine, the heating equipment is an electromagnetic induction heating furnace, and the quality inspection equipment comprises surface quality equipment, specification and dimension inspection equipment and mechanical property and physical and chemical property inspection equipment. The utility model discloses a rationally integrate stainless steel rail hot extrusion moulding's production flow, optimized the production process, the stainless steel rail of production satisfies the requirement for quality, is favorable to reduction in production cost, increases enterprise economic benefits.
Description
Technical Field
The utility model belongs to the technical field of hot extrusion forming technique and profile shapes are made, a hot extrusion forming system of stainless steel rail is related to.
Background
Steel rails are the main components of railway tracks. Its function is to guide the wheels of the rolling stock forward, to be stressed by the wheels and to be transmitted to the sleepers. The rails must provide a continuous, smooth and minimally resistive rolling surface for the wheel. In the electric railway or automatic block section, the rail can also be used as a track circuit. The section of the steel rail is in an I-shaped section with the best bending resistance, and comprises a rail head, a rail web and a rail bottom. In order to make the rail better withstand forces from all directions and to ensure the necessary strength conditions, the rail should have sufficient height, its head and base should have sufficient area and height, and the waist and base should not be too thin.
The most common method of rail forming is hot roll forming, which is mainly used for mass production of rails. The method for producing the steel rail by adopting the hot extrusion method is not reported in documents. The hot extrusion molding method can be used for one-step molding, the surface quality can be ensured, and the structure performance can be ensured through heat treatment. The replacement specification is very simple during production, and the method is very suitable for the production of small-batch steel rails. However, this molding method also has many difficulties: the steel rail can be scrapped no matter which link is in trouble, such as the design of tools and dies, the heating process, the lubricating effect and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hot extrusion molding system of stainless steel rail, the hot extrusion molding's of the reasonable stainless steel rail production facility of integrating optimizes the process of rail production, satisfies the required quality of stainless steel rail, reduction in production cost increases enterprise economic benefits.
The technical scheme of the utility model is that: the hot extrusion molding system of the stainless steel rail comprises machining equipment, heating equipment, lubricating equipment, hot extrusion equipment, a cooling bed, heat treatment equipment and quality inspection equipment, wherein the machining equipment, the heating equipment, the lubricating equipment, the hot extrusion equipment, the cooling bed, the heat treatment equipment and the quality inspection equipment are sequentially arranged. The machining equipment comprises a lathe, a cutting machine and a polishing machine, the heating equipment is an electromagnetic induction heating furnace, and the quality inspection equipment comprises surface quality equipment, specification and dimension inspection equipment and mechanical property and physical and chemical property inspection equipment.
The hot extrusion equipment is a 63MN horizontal extruder. The horizontal extruder comprises an extruding cylinder and an extruding die, wherein the extruding cylinder comprises an extruding cylinder outer sleeve, an extruding cylinder middle liner and an extruding cylinder inner liner, and the extruding die comprises a die middle support, a die base, a die middle pad and a die rear pad. The rail hole pattern of the rail extrusion die is provided with a gradual change flow guiding arc line. The die support and the die center support of the extrusion die are both provided with steel rail hole patterns in the shape of steel rails.
The utility model discloses an integration stainless steel rail hot extrusion's production flow has optimized the process of rail production, and the stainless steel rail of production satisfies the requirement for quality, is favorable to reduction in production cost, increases enterprise economic benefits. Compared with the traditional hot rolling process, the hot extrusion process has the advantages of no limitation of blanks, stable forming process, flexible production mode and the like.
Drawings
FIG. 1 is a schematic flow chart of the hot extrusion molding system for stainless steel rails according to the present invention;
FIG. 2 is an assembly view of an extruder barrel and an extrusion die;
FIG. 3 is a schematic view of an extrusion die configuration;
FIG. 4 is a view A-A of FIG. 3;
FIG. 5 is a schematic of machining a blank;
fig. 6 is a side cross-sectional view of fig. 5.
Wherein: the method comprises the following steps of 1-forging plain billet round steel, 2-extrusion die, 3-steel rail hole type, 4-positioning pin hole, 5-die center support, 6-die support, 8-extrusion cylinder jacket, 9-extrusion cylinder center lining, 10-extrusion cylinder lining, 11-die holder, 12-die center pad, 13-die rear pad, 14-processing equipment, 15-heating equipment, 16-lubricating equipment, 17-hot extrusion equipment, 18-cooling bed, 19-heat treatment equipment, 20-inspection equipment and 21-extrusion cylinder.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The protection scope of the present invention is not limited to the embodiments, and those skilled in the art can make any changes within the scope defined by the claims.
The utility model discloses stainless steel rail's hot extrusion molding system, as shown in fig. 1, including machining equipment 14, firing equipment 15, lubricating arrangement 16, hot extrusion equipment 17, cold bed 18, equipment for heat treatment 19 and check out test set 20. The processing equipment, the heating equipment, the lubricating equipment, the hot extrusion equipment, the cooling bed, the heat treatment equipment and the quality inspection equipment are arranged in sequence. The machining equipment comprises a lathe, a cutting machine and a polishing machine, and the heating equipment is an electromagnetic induction heating furnace. The quality inspection equipment 20 includes surface quality equipment, specification and dimension inspection equipment, and mechanical property and physical and chemical property inspection equipment.
The hot extrusion equipment is a 63MN horizontal extruder. As shown in fig. 2, the extruder comprises a container 21 including a container jacket 8, a container liner 9 and a container liner 10, and an extrusion die 2 including a die center support 5, a die support 6, a die holder 11, a die center pad 12 and a die rear pad 13. As shown in fig. 3 and 4, the die support 6 and the die center support 5 of the extrusion die 2 each have a rail groove 3 in the shape of a rail. The other apparatus is conventional. The hot extrusion forming process route of the stainless steel rail of the utility model is as follows: blank processing → blank preheating → induction heating → tool and die preparation → lubrication → hot extrusion → cooling → heat treatment → inspection. The method comprises the following specific steps:
firstly, blank processing: the steel material is the forging polished blank round steel 1 of GB/T122006 Cr19Ni10, and the forging polished blank round steel is subjected to sawing, lathe processing and outer surface polishing according to the process requirements; the outer surface of the saw is required to be smooth and flawless after being processed and polished, the roughness is less than or equal to 2.0 mu m, and the cutting slope of the end surface after saw cutting is less than or equal to 5 mm; as shown in FIG. 5, the head of the lathe-machined blank is machined into a cone structure, the taper of the cone is 1:4, the top of the cone is an inverted external arc angle R30mm, the external diameter is phi 350mm, and the length is 640 mm.
The induction heating: in order to ensure the lubricating effect of the cone part of the blank during extrusion, glass powder is pre-coated on the cone part of the blank before heating. Adopting a sectional heating and temperature equalizing method, wherein the temperature measurement is based on the central temperature of the head of the blank, and the first section is as follows: heating to 800 ℃ with low power (300KW), and carrying out temperature equalization for 5-8 minutes; and a second stage: heating to 1000 ℃ with low power (300KW), and carrying out uniform temperature for 5-8 minutes; a third stage: heating to 1050 ℃ with medium power (450KW), and carrying out uniform temperature for 4-6 minutes; a fourth stage: heating to 1100 ℃ with medium power (450KW), and carrying out temperature equalization for 2-4 minutes; stage 5: rapidly heating to 1120-1160 ℃ by high power (600KW), and rapidly discharging.
Preparing a tool and a die: adopting an extrusion die with a hole pattern same as the shape of the steel rail, wherein the hole pattern of the steel rail die is provided with a gradual change flow guide arc line, as shown in figures 3 and 4; the die support 6 and the die center support 5 of the extrusion die are both provided with rail pass 3 in the shape of a rail. As shown in fig. 2, the tool and the die are assembled in place by an operator, and after the tool and the die are assembled, a technician checks whether the die meets the steel rail extrusion requirement.
Lubricating: glass lubrication is carried out on the outer surface of the blank and an extrusion die in the extrusion process, and the hole pattern of the lubrication glass pad is a steel rail type glass pad;
firstly, paving 844-7 type glass powder on a lubricating platform of an extruder;
secondly, HDK-5 glass powder is selected for manufacturing the glass pad, the glass pad is used for manufacturing a tool and a die, and the tool and the die are placed in a resistance furnace for drying at 150 ℃ after being pressed and formed.
Carrying out hot extrusion: the billet was hot-extruded into a rail using a 375 series extrusion cylinder using a 63MN horizontal extruder. The extrusion ratio was 11.3, the extrusion speed was 78mm/S, and the actual extrusion force was 54 MN.
Sixthly, cooling: and air-cooling the extruded steel rail on a cooling bed to normal temperature.
Heat treatment of ears: carrying out heat treatment on the steel rail; heating at 1000 deg.C, holding for 3 hr, discharging, and cooling with water.
And (3) checking: and (4) inspecting the stainless steel rail produced by the steps, wherein the inspection comprises surface quality, size, mechanical property and physical and chemical properties. The performance test was performed by sampling the position of the upper track portion of the rail.
The chemical compositions of the stainless steel rail produced by the utility model are shown in the table 1, and the mechanical property test results are shown in the table 2.
TABLE 1 examination of chemical composition
TABLE 2 results of mechanical Property examination
Through inspection, the surface quality, dimensional accuracy, physical and chemical properties, mechanical properties and other indexes of the manufactured stainless steel rail meet the design requirements.
Claims (4)
1. A hot extrusion molding system of stainless steel rail, characterized by: the system comprises machining equipment (14), heating equipment (15), lubricating equipment (16), hot extrusion equipment (17), a cooling bed (18), heat treatment equipment (19) and quality inspection equipment (20), wherein the machining equipment, the heating equipment, the lubricating equipment, the hot extrusion equipment, the cooling bed, the heat treatment equipment and the quality inspection equipment are sequentially arranged; the machining equipment comprises a lathe, a cutting machine and a polishing machine, the heating equipment is an electromagnetic induction heating furnace, and the quality inspection equipment (20) comprises surface quality equipment, specification and dimension inspection equipment and mechanical property and physical and chemical property inspection equipment.
2. The hot extrusion molding system for stainless steel rails according to claim 1, wherein: the hot extrusion equipment is 63MN horizontal extruder, the extruder includes recipient (21) and extrusion die (2), the recipient includes recipient overcoat (8), recipient lining (9) and recipient inside lining (10), extrusion die includes in the mould prop (5), mould support (6), die holder (11), pad (12) and mould back pad (13) in the mould.
3. The hot extrusion molding system for stainless steel rails according to claim 2, wherein: the die support (6) and the die middle support (5) of the extrusion die (2) are both provided with a steel rail hole pattern (3) in a steel rail shape.
4. The hot extrusion molding system for stainless steel rails according to claim 2, wherein: the steel rail hole pattern (3) of the extrusion die (2) is provided with a gradual change flow guide arc line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022137890.4U CN213613376U (en) | 2020-09-25 | 2020-09-25 | Hot extrusion molding system of stainless steel rail |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022137890.4U CN213613376U (en) | 2020-09-25 | 2020-09-25 | Hot extrusion molding system of stainless steel rail |
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| CN213613376U true CN213613376U (en) | 2021-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207145A (en) * | 2020-09-25 | 2021-01-12 | 邯郸新兴特种管材有限公司 | Hot extrusion molding method of stainless steel rail |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207145A (en) * | 2020-09-25 | 2021-01-12 | 邯郸新兴特种管材有限公司 | Hot extrusion molding method of stainless steel rail |
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