CN213613379U

CN213613379U - Copper alloy track's hot extrusion's worker mould

Info

Publication number: CN213613379U
Application number: CN202022228995.0U
Authority: CN
Inventors: 叶丙义; 周洁; 王连华; 高杰; 张爱亮; 刘富强
Original assignee: Handan Xinxing Special Pipe Co ltd
Current assignee: Handan Xinxing Special Pipe Co ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-07-06
Anticipated expiration: 2030-10-09

Abstract

The utility model relates to a orbital hot extrusion's of copper alloy worker mould, including extrusion die, plug and cold drawing mould, the extrusion die center is equipped with the die cavity cover, and the pass of die cavity cover is the same with the orbital appearance shape of copper alloy, and the die cavity cover is equipped with the water conservancy diversion pitch arc of gradual change. The head of the core rod is provided with a needle point with the same shape as the inner hole of the track of the copper alloy track, and the mold cavity sleeve and the needle point at the head of the core rod form a molding cavity of the copper alloy track. The cold-drawing die comprises an outer die and an inner die, and the cold-drawing die is used for cold-drawing the copper alloy rail subjected to the solution heat treatment to the size required by the technical agreement. The utility model discloses an optimize the mold design, make the one shot forming of work piece appearance and hole, improve extrusion's process, produce the copper alloy track that surface quality is good.

Description

Copper alloy track's hot extrusion's worker mould

Technical Field

The utility model belongs to the technical field of extrusion technique and profile shapes are made, a orbital hot extrusion's of copper alloy worker's mould is related to.

Background

The copper alloy rail belongs to special profile materials, is applied to the fields of military industry and the like, and is a better choice as a special rail due to excellent wear resistance, higher strength and excellent conductivity. The forming method of the solid copper alloy rail in China generally adopts a forging process forming method, but the forging process of the copper alloy rail with the special-shaped inner hole is difficult to form. And the one-step molding of the external shape and the special-shaped inner hole can be realized by adopting the hot extrusion method for molding. Hot extrusion is extrusion by heating a metal material to a hot forging temperature, that is, extrusion by heating a billet to a temperature higher than the recrystallization temperature of the metal before extrusion. The hot extrusion die is a die for directly extruding hot metal into various profiles, profiles or pipes.

The utility model discloses a patent number is CN 111570553A's utility model application discloses an extrusion die for making track traffic automobile body end beam section bar, including last mould and lower mould, it has the last mould core that suits with lower mould chamber to go up the mould, the nib that the gap between last mould core and the lower mould chamber constitutes cavity rectangle tubular structure, the nib is by first runner, the second runner, third runner and fourth runner surround and form, all have the diagonal flow channel between the adjacent mould core head, it has a plurality of diffluence orifices to go up the mould, the hookup location of second runner and fourth runner and each diagonal flow channel exposes respectively in the diffluence orifice that corresponds. The patent is used for manufacturing an extrusion die of the end beam section of the rail transit vehicle body, but cannot be used for hot extrusion molding of the copper alloy rail.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a orbital hot extrusion's of copper alloy worker mould optimizes the mold design, makes the one shot forming of work piece appearance and hole, improves extrusion's process, produces the copper alloy track that surface quality is good.

The technical scheme of the utility model is that: the hot extrusion molding tool and die for the copper alloy track comprise an extrusion die, a core rod and a cold drawing die, wherein a die cavity sleeve is arranged at the center of the extrusion die, the hole pattern of the die cavity sleeve is the same as the shape of the copper alloy track, and a gradual change flow guide arc line is sleeved on the die cavity sleeve. The head of the core rod is provided with a needle point with the same shape as the inner hole of the track of the copper alloy track, and the mold cavity sleeve and the needle point at the head of the core rod form a molding cavity of the copper alloy track. The cold-drawing die comprises an outer die and an inner die, and the cold-drawing die is used for cold-drawing the copper alloy rail subjected to the solution heat treatment to the size required by the technical agreement.

The material of the extrusion die is H13 and the material of the cold-drawing die is Cr12 MoV. The core rod is provided with a connecting piece 1, a positioning pin and a connecting screw thread. The width L1 of the inner hole of the copper alloy rail is 40 +/-3 mm, the height H1 is 21 +/-2 mm, the width L2 of the copper alloy rail is 180 +/-2 mm, and the height H2 is 98 +/-2 mm. The die support and the die center support of the extrusion die are both provided with a hole pattern in the shape of a copper alloy track.

The utility model discloses orbital hot extrusion's of copper alloy worker's mould makes the one shot forming of work piece appearance and hole through optimizing the mold design, has improved extrusion's process, produces the copper alloy track that surface quality is good. Compared with the traditional forging process, the utility model discloses preparation simple process, the lumber recovery is high to manufacturing cost has been reduced.

Drawings

FIG. 1 is a schematic diagram of a copper alloy rail structure;

FIG. 2 is a schematic view of an extrusion die;

FIG. 3 is a cross-sectional view of an extrusion die A-A;

FIG. 4 is a schematic view of an extrusion mandrel;

FIG. 5 is a cross-sectional view B-B of the core rod tip;

FIG. 6 is a schematic view of a molding cavity;

FIG. 7 is a schematic view of a cold-drawing die;

FIG. 8 is a cross-sectional view of a cold-drawing die C-C;

FIG. 9 is a schematic view of a full section hardness test position.

Wherein: 1-copper alloy track, 2-core rod, 3-needle point, 4-molding cavity, 5-extrusion die, 6-external die, 7-internal die, 8-die cavity sleeve, 9-track inner hole, 10-connecting piece, 11-locating pin, 12-connecting screw thread, 13-cold drawing die, L1-width of copper alloy track, L2-width of track inner hole, H1-height of copper alloy track, and H2-height of track inner hole.

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 orbital hot extrusion's of copper alloy worker mould is shown including extrusion die 5, plug 2 and cold drawing mould 13 in 2 ~ 8. The center of the extrusion die is provided with a die cavity sleeve 8, the shape of the hole pattern of the die cavity sleeve is the same as that of the copper alloy track 1, and the die cavity sleeve is provided with a gradual change flow guide arc line. The head of the core rod is provided with a needle point 3 with the same shape as the track inner hole 9 of the copper alloy track, and the die cavity sleeve and the needle point at the head of the core rod form a forming die cavity 4 of the copper alloy track. The cold-drawing die comprises an outer die and an inner die, and the cold-drawing die is used for cold-drawing the copper alloy rail subjected to the solution heat treatment to the size required by the technical agreement. The material of the extrusion die 5 is H13 and the material of the cold-drawing die is Cr12 MoV. The core rod 2 is provided with a connecting piece 10, a positioning pin 11 and a connecting screw thread 12. The die support and the die center support of the extrusion die 5 both have a hole pattern in the shape of a copper alloy rail.

The utility model discloses the copper alloy track of production is shown in figure 1, and there is track hole 9 at the orbital center of copper alloy, and the width L1 of the orbital track hole 9 of copper alloy is 40 + -3 mm, high H1 is 21 + -2 mm, and copper alloy track 1's width L2 is 180 + -2 mm, high H2 is 98 + -2 mm.

Use the utility model discloses the orbital hot extrusion's of copper alloy frock mould production copper alloy orbital process route does: blank processing → blank heating → tool and die preparation → lubrication → hot extrusion → cooling → solution heat treatment → inspection → straightening → cold drawing → aging heat treatment → inspection → straightening. The method comprises the following specific steps:

firstly, blank processing: the copper alloy used is low beryllium high-conductivity high-strength beryllium bronze. Firstly, sawing forged polished blank round steel, wherein the sawing length is 1300mm, and the end face cutting slope after sawing is less than or equal to 5 mm; drilling holes, namely drilling holes in the center of the sawed blank, wherein the hole diameter is 80 mm; thirdly, turning and polishing the outer surface and the head; the process requirements are as follows: after being processed and polished, the outer surface is smooth and has no defect, the roughness is less than or equal to 2.0 mu m, the head is chamfered, the external arc angle R305mm is formed, and the external diameter phi 425mm is formed.

Secondly, heating the blank: before the blank is heated, the surface is coated with titanium alloy anti-oxidation coating, the drying temperature is 180 ℃, and the drying time is 1 h. Heating by a resistance furnace at 900 ℃, heating the blank along with the furnace, and keeping the temperature for 5 hours after the blank reaches the temperature.

Preparing a tool and a die: the extrusion die which is specially designed and has the hole pattern same as the copper alloy in shape is adopted. As shown in fig. 2 and 3, the hole pattern of the die has a gradual change of the diversion arc line, and the die support and the die center support of the die both have a hole pattern in the shape of a steel rail. As shown in figures 4 and 5, the head of the core rod is provided with a needle point with the same shape as the inner hole of the copper alloy, and as shown in figure 6, a forming cavity of the copper alloy track is formed by the hole type of the extrusion die and the needle point. Assembling an extrusion die on a die holder of an extruder according to a set position; secondly, the extrusion core rod is arranged on the extrusion core rod, and the extrusion core rod is adjusted to a proper position.

Lubricating: the extrusion die, the manipulator and the extrusion cylinder are coated with sufficient and uniform lubricant.

Carrying out hot extrusion: the billet was hot extruded into a copper alloy rail using a 435 series extrusion barrel using a 63MN horizontal extruder. The parameters of the hot extrusion process are as follows: the extrusion ratio was 8.2, the extrusion speed was 48mm/S, and the extrusion force was theoretically calculated to be 49.3 MN. The barrel temperature was 346 ℃ before extrusion.

Sixthly, cooling: the extruded copper alloy rail was cooled to room temperature in air.

Solution heat treatment for ears: the technological conditions of the solution heat treatment are as follows: heating temperature is 950 ℃, the temperature of the workpiece rises along with the furnace, the temperature is preserved for 120 minutes after the temperature is reached, and the workpiece is rapidly discharged from the furnace and cooled by water.

And (3) checking: and (5) testing the hardness and the conductivity after the solution heat treatment.

Straightening the self-skin: and straightening the copper alloy rail after the solution heat treatment to achieve the straightness required by cold drawing.

The method has the advantages of cold drawing: the copper alloy rails after the solution heat treatment are cold-drawn to the dimensions required for the process using the cold-drawing dies shown in fig. 7 and 8.

Aging heat treatment: the aging heat treatment process conditions are as follows: the heating temperature is 450 ℃, the temperature of the workpiece is raised along with the furnace, the workpiece is kept warm for 240 minutes after reaching the temperature, and the workpiece is slowly cooled along with the furnace.

Performing water test: and (3) carrying out full-section hardness, electric conductivity, room-temperature tensile strength, 600-DEG C high-temperature tensile strength and metallographic examination on the copper alloy rail subjected to aging heat treatment.

And (6) performing selection and straightening: and straightening the copper alloy track subjected to the time-effect heat treatment to ensure that the upper, lower, left and right straightness of the copper alloy track meets the requirements of technical protocols. According to the process requirements, the performance and the size of each item of the copper alloy track formed by hot extrusion of the utility model are tested, and the test position is shown in figure 9.

According to the technical requirements, the performance and the size of each item of the copper alloy track formed by hot extrusion of the utility model are inspected. Table 1 shows the mechanical properties of the copper alloy rails; table 2 shows the tensile strength at 600 ℃; table 3 shows the full section hardness (see fig. 9 for test positions); table 4 full length conductivity; table 5 is the cd inspection data. All meet the requirements.

Table 1. copper alloy track mechanical property parameters

Parameters of mechanical properties	Require that	Measured value
			Tensile strength/MPa	≥800	840
Yield strength/MPa	≥700	721
			Elongation/percent	≥14	18

TABLE 2 tensile Strength at 600 ℃

Parameters of mechanical properties	Require that	Measured value
			Tensile strength/MPa	≥300	364

TABLE 3 Total section hardness (test position see FIG. 9)

TABLE 4 full Length conductivity

TABLE 5 Key size detection Meter (mm)

Above data show, utilize the utility model discloses indexes such as copper alloy track's that copper alloy track hot extrusion mould made surface quality, size precision, physical and chemical properties, mechanical properties, electric conductive property all satisfy the design requirement, have solved various technological problems in this forming method, have established the basis for orbital industrial application of copper alloy and batch production.

Claims

1. The utility model provides a orbital hot extrusion's of copper alloy worker mould, characterized by: the tool and die comprises an extrusion die (5), a core rod (2) and a cold-drawing die (13), wherein a die cavity sleeve (8) is arranged at the center of the extrusion die, the shape of the hole pattern of the die cavity sleeve (8) is the same as that of the copper alloy track (1), and a gradual change flow guide arc line is sleeved on the die cavity sleeve; the head of the core rod is provided with a needle point (3) with the same shape as the track inner hole (9) of the copper alloy track, and the die cavity sleeve and the needle point at the head of the core rod form a forming die cavity (4) of the copper alloy track; the cold-drawing die (13) comprises an outer die (6) and an inner die (7), and the cold-drawing die is used for cold-drawing the copper alloy rail subjected to the solution heat treatment to the size required by the technical agreement.

2. The tool and die for hot extrusion molding of a copper alloy rail as set forth in claim 1, wherein: the extrusion die (5) is made of H13 and the cold-drawing die is made of Cr12 MoV.

3. The tool and die for hot extrusion molding of a copper alloy rail as set forth in claim 1, wherein: the core rod (2) is provided with a connecting piece (10), a positioning pin (11) and a connecting screw thread (12).

4. The tool and die for hot extrusion molding of a copper alloy rail as set forth in claim 1, wherein: the width L1 of the track inner hole (9) of the copper alloy track is 40 +/-3 mm, the height H1 is 21 +/-2 mm, the width L2 of the copper alloy track (1) is 180 +/-2 mm, and the height H2 is 98 +/-2 mm.

5. The tool and die for hot extrusion molding of a copper alloy rail as set forth in claim 1, wherein: and the die support and the die middle support of the extrusion die (5) are provided with a hole pattern in the shape of a copper alloy track.