Non-equal channel extrusion die for aluminum-titanium composite plate and production process of aluminum-titanium composite plate
By adopting horizontal sliding mechanism and non-equal channel structure in the non-equal channel extrusion mold of aluminum-titanium composite plate, the friction force in the die-space of the mold is reduced, the fluidity and bondability of aluminum are improved, and the aluminum in the prior art is solved The problem of poor material flowability achieves uniform laying of aluminum materials and controllability and safety of process.
Patent Information
- Application Number
- CN201810926615.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-08-15
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2038-08-15
AI Technical Summary
In the existing aluminum-titanium composite plate non-isotropic extrusion molds, the metal flowability and high friction force in the die-space position of the mold are poor, the fluidity of the aluminum metal to the titanium plate is poor, the bonding ability is low, the preparation process is difficult, and the product quality is low.
A non-iso-channel extrusion die of aluminum-titanium composite plate is designed, and the titanium plate is used to include an extrusion mechanism, an upper die, a lower die and a horizontal sliding mechanism in turn. The titanium plate is realized through the extrusion rod and linear motor driving the support plate. The relative movement of the lower mold reduces friction, improves the fluidity of aluminum, and ensures uniform laying of aluminum through non-isometric channel structure and smooth transition structure.
It effectively solves the problem of poor metal flowability at the die-zone location of the mold, improves the fluidity and bonding of aluminum materials, realizes uniform laying of aluminum materials, reduces friction, avoids the generation of oxide scale, and improves the ability of the process. Control and security.
Smart Images
Figure CN108856676B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of extrusion, and in particular relates to a non-equal channel extrusion die for an aluminum-titanium composite plate and a production process for the aluminum-titanium composite plate. Background Art
[0002] Metal composite plates are formed by the composite of two or more metals. Compared with single metal plates, composite plates not only better concentrate the excellent properties of the parent material, but also reduce the production cost of the material. Aluminum / titanium composite plates have the advantages of low density, high thermal conductivity, and high cost performance of aluminum, as well as high temperature resistance, corrosion resistance, and high specific strength (the ratio of the tensile strength of the material to the apparent density of the material) of titanium. Non-equichannel extrusion is a new process that further induces severe plastic strain on the ECAP technology. Titanium / aluminum composite plates are prepared by non-equichannel transverse co-extrusion forming process, and almost no surface film and oxide are generated during the interface bonding process. Since the thickness of the composite plate extruded by non-equichannel extrusion can be controlled below 5mm, non-equichannel extrusion technology is mostly used in the production of lightweight structural parts. It has important value and clear application background for improving the practical level of research on the preparation and forming process of titanium / aluminum composite plates in the fields of marine chemical industry, aerospace and nuclear energy equipment in my country.
[0003] For example, the patent with application number CN201710205931.9 discloses a co-extrusion preparation device for heterogeneous bimetallic composite plates, which can realize the production of metal composite plates. However, the dead zone of the mold in the non-equal channel extrusion process has the disadvantages of poor metal fluidity and high friction, resulting in poor fluidity of aluminum metal to the titanium plate, causing the titanium / aluminum composite plate to have low bonding, difficult preparation process, and low product quality. Summary of the invention
[0004] The present invention provides a non-equichannel extrusion die for an aluminum-titanium composite plate, which at least solves the problem in the prior art that the metal fluidity at the dead zone of the die is poor and the friction force is large, resulting in poor fluidity of the aluminum material metal to the titanium plate.
[0005] The object of the present invention is to provide a mold for obtaining an aluminum-titanium composite plate by adopting a non-equichannel extrusion preparation process. The non-equichannel extrusion mold for the aluminum-titanium composite plate comprises an extrusion mechanism, an upper mold, a lower mold, and a horizontal sliding mechanism from top to bottom. The upper mold is provided with an aluminum material accommodating cavity and an aluminum material outflow channel. The upper end of the aluminum material outflow channel is connected to the aluminum material accommodating cavity. The extrusion mechanism is installed on the upper mold. A retractable extrusion end is provided on the extrusion mechanism. The extrusion end of the extrusion mechanism is installed in the aluminum material accommodating cavity. The lower mold is located at the lower end of the upper mold. A non-equichannel is provided in the lower mold. The non-equichannel is a vertical channel, and the upper end cross-section of the non-equichannel is larger than the lower end cross-section of the non-equichannel. The upper end of the non-equichannel is connected to the lower end of the aluminum material outflow channel. The non-equichannel is connected to the aluminum material accommodating cavity through the aluminum material outflow channel, and the lower end of the non-equichannel faces the horizontal sliding mechanism.
[0006] Furthermore, the extrusion mechanism is an extrusion rod.
[0007] Furthermore, the horizontal sliding mechanism is a horizontal sliding block.
[0008] Furthermore, the horizontal sliding mechanism includes a linear motor and a supporting plate, the linear motor includes a mover structure and a guide rail structure, the supporting plate is installed on the mover structure, and the supporting plate is located between the lower mold and the linear motor.
[0009] Furthermore, the non-equivalent channels of the lower mold include a first channel, a second channel, and a third channel from top to bottom, the cross-sectional areas of the first channel, the second channel, and the third channel decrease successively, the lower end of the first channel is connected to the upper end of the second channel, and the lower end of the second channel is connected to the upper end of the third channel.
[0010] Furthermore, a first smooth transition structure is provided between the lower end of the first channel and the upper end of the second channel, and a second smooth transition structure is provided between the lower end of the second channel and the upper end of the third channel.
[0011] The present invention also discloses a production process of the aluminum-titanium composite plate using the above-mentioned aluminum-titanium composite plate non-equal channel extrusion die, comprising the following steps:
[0012] Step 1: Heat the mold to melt the aluminum material in the aluminum material receiving cavity;
[0013] Step 2: The extrusion mechanism extrudes the aluminum material in the aluminum material containing cavity, so that the aluminum material flows out through the aluminum material outflow channel and the non-equivalent channel onto the titanium plate on the horizontal sliding mechanism;
[0014] Step 3: Control the horizontal sliding mechanism to slide so that the titanium plate and the lower die move relative to each other to ensure that the aluminum material is laid on the titanium plate and complete the extrusion process of the aluminum-titanium composite plate.
[0015] Furthermore, in step 1, the mold is placed in a constant temperature box at 450-500° C. to melt the aluminum material in the aluminum material receiving cavity.
[0016] Furthermore, the extrusion force of the extrusion mechanism is 250-300KN.
[0017] Furthermore, the ratio of the movement speed of the horizontal sliding mechanism to the extrusion speed of the extrusion mechanism is 0.6-1.0.
[0018] Compared with the prior art, the present invention adopts a horizontal sliding mechanism to enable the titanium plate to move relative to the lower die, thereby reducing the friction of the aluminum metal near the dead zone between the titanium plate and the lower die, improving the fluidity of the aluminum metal in the dead zone, causing the aluminum metal in the dead zone to rub against the titanium plate, and promoting the aluminum material to be evenly laid on the surface of the titanium plate, effectively solving the problem in the prior art that the aluminum material has poor fluidity and large friction in the dead zone of the mold, resulting in poor fluidity of the aluminum metal to the titanium plate, and the aluminum material cannot be evenly laid on the surface of the titanium plate. At the same time, compared with the explosive welding process, the process disclosed by the present invention does not pollute the environment, is less dangerous, and has high controllability. In addition, compared with the casting and rolling composite method, the process disclosed by the present invention can easily control the thickness of the aluminum material on the plate, and does not require the assistance of the rolling process. Compared with the rolling composite method, the contact surface between the aluminum material and the outside air during the process disclosed by the present invention is limited, thereby effectively solving the problem of oxide scale on the surface of the aluminum material. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic structural diagram of a non-equal channel extrusion die for an aluminum-titanium composite plate according to an embodiment of the present invention;
[0020] Figure 2 It is a schematic diagram of the structure of non-equichannels according to an embodiment of the present invention. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.
[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.
[0023] The embodiment of the present invention discloses a non-equal channel extrusion die for an aluminum-titanium composite plate, such as Figure 1 As shown, the non-equivalent channel extrusion die of the aluminum-titanium composite plate includes an extrusion mechanism 1, an upper die 2, a lower die 3, and a horizontal sliding mechanism 4 from top to bottom. The upper die 2 is provided with an aluminum material accommodating cavity 21 and an aluminum material outflow channel 22. The upper end of the aluminum material outflow channel 22 is connected to the aluminum material accommodating cavity 21. The extrusion mechanism 1 is installed on the upper die 2. A retractable extrusion end is provided on the extrusion mechanism 1. The extrusion end of the extrusion mechanism 1 is installed in the aluminum material accommodating cavity 21. The lower die 3 is located at the lower end of the upper die 2. A non-equivalent channel 31 is provided in the lower die 3. The non-equivalent channel 31 is a vertical channel, and the upper end cross-section of the non-equivalent channel 31 is larger than the lower end cross-section of the non-equivalent channel. The upper end of the non-equivalent channel 31 is connected to the lower end of the aluminum material outflow channel 22. The non-equivalent channel 31 is connected to the aluminum material accommodating cavity 21 through the aluminum material outflow channel 22. The lower end of the non-equivalent channel 31 faces the horizontal sliding mechanism 4.
[0024] Among them, Figure 1 , 2 As shown, the extrusion mechanism 1 is an extrusion rod 1, and the horizontal sliding mechanism 4 is a horizontal sliding block 4. The non-equivalent channels 31 of the lower die 3 include a first channel 311, a second channel 312, and a third channel 313 from top to bottom. The cross-sectional areas of the first channel 311, the second channel 312, and the third channel 313 decrease in sequence. The lower end of the first channel 311 is connected to the upper end of the second channel 312, and the lower end of the second channel 312 is connected to the upper end of the third channel 313. Figure 2 As shown, there is a first smooth transition structure 321 between the lower end of the first channel 311 and the upper end of the second channel 312, and a second smooth transition structure 322 between the lower end of the second channel 312 and the upper end of the third channel 313, thereby ensuring that the inner wall of the non-equilateral channel 31 is a smooth surface structure without edges and corners.
[0025] like Figure 1 As shown in FIG, the distance between the lower end of the lower die 3 and the titanium plate 5 is 2 mm.
[0026] The production process of the aluminum-titanium composite plate according to the embodiment of the present invention is as follows:
[0027] Step 1: placing the mold in a constant temperature box at 450° C. to melt the aluminum material in the aluminum material receiving cavity 21;
[0028] Step 2: The extrusion rod 1 extrudes the aluminum material in the aluminum material accommodating cavity 21 with an extrusion force of 267 KN, so that the aluminum material flows out through the aluminum material outflow channel 22 and the non-equivalent channel 31 onto the titanium plate 5 on the horizontal slider, wherein the titanium plate 5 is Ti-6Al-4V titanium alloy, and the thickness of the titanium plate 5 is 0.8 mm and the width is 20 mm;
[0029] Step 3: Control the horizontal slider to slide at 6 mm / sec to make the titanium plate 5 and the lower mold 3 move relative to each other, ensure that the thickness of the aluminum material on the titanium plate 5 is 2 mm and the width is 20 mm, complete the extrusion process of the aluminum-titanium composite plate, cool the composite plate, ensure that the aluminum material solidifies, and form a stable aluminum-titanium composite plate.
[0030] The ratio of the movement speed of the horizontal slider to the extrusion speed of the extrusion rod 1 is 1.0.
[0031] The embodiment of the present invention adopts a bottom horizontal slider on the basis of a non-equal channel extrusion process to increase the contact area between the aluminum material and the upper and lower molds. As the cross-section of the mold flow channel becomes smaller and smaller, the extrusion ratio becomes larger and larger, thereby avoiding a sharp increase in the extrusion ratio to a certain extent, solving the problem of increased difficulty in metal flowing out of the mold hole and increased extrusion force during extrusion, and avoiding uneven deformation of the aluminum material caused by the increased difference in the flow velocity of the internal and external metals.
[0032] The embodiment of the present invention applies a certain speed to the horizontal slider to reduce the friction of the metal near the dead zone, improve the fluidity of the metal in the dead zone, and make the metal in the dead zone generate friction with the titanium plate 5 to promote their joint movement. And as the ratio between the movement speed of the horizontal slider and the extrusion speed of the extrusion rod 1 is greater than a certain critical value of 0.6-1.0, the maximum extrusion load will show a downward trend, at which time the friction force becomes the driving force, and the uniform strain will increase with the increase of the friction coefficient and the decrease of the extrusion force, so that the aluminum material is evenly laid on the surface of the titanium plate.
[0033] Compared with the prior art, the embodiment of the present invention adopts a horizontal sliding mechanism 4 to enable the titanium plate 5 to move relative to the lower mold 3, thereby reducing the friction of the aluminum metal near the dead zone between the titanium plate 5 and the lower mold 3, improving the fluidity of the aluminum metal in the dead zone, so that the aluminum metal in the dead zone generates friction with the titanium plate 5, and promotes the aluminum material to be evenly laid on the surface of the titanium plate 5, effectively solving the problem in the prior art that the aluminum material has poor fluidity and large friction at the dead zone of the mold, resulting in poor fluidity of the aluminum material to the titanium plate 5, and the aluminum material cannot be evenly laid on the surface of the titanium plate 5. At the same time, compared with the explosive welding process, the process disclosed in the embodiment of the present invention does not pollute the environment, is less dangerous, and has high controllability. In addition, compared with the casting and rolling composite method, the process disclosed in the embodiment of the present invention can easily control the thickness of the aluminum material on the plate, and does not require the assistance of the rolling process. Compared with the rolling composite method, the contact surface between the aluminum material and the outside air during the process disclosed in the embodiment of the present invention is limited, thereby effectively solving the problem of oxide scale on the surface of the aluminum material.
[0034] Optionally, the horizontal sliding mechanism 4 of the embodiment of the present invention may also adopt a linear motor and a support plate structure, wherein the linear motor includes a mover structure and a guide rail structure, the support plate is installed on the mover structure, and the support plate is located between the lower mold and the linear motor.
[0035] Among them, the titanium plate 5 is installed on the supporting plate, and the staff can realize the automatic sliding of the supporting plate by controlling the linear motor, thereby improving the degree of automation of the extrusion preparation mold.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the specification of this application, the technicians can still modify or replace the specific implementation mode of the present invention with equivalents, but these modifications or changes do not deviate from the scope of protection of the pending claims of the present application.
Claims
1. Non-equal channel extrusion die for aluminum-titanium composite plate, It is characterized in that The non-equivalent channel extrusion die of the aluminum-titanium composite plate includes an extrusion mechanism, an upper die, a lower die, and a horizontal sliding mechanism from top to bottom, wherein the upper die is provided with an aluminum material accommodating cavity and an aluminum material outflow channel, the upper end of the aluminum material outflow channel is connected to the aluminum material accommodating cavity, the extrusion mechanism is installed on the upper die, a retractable extrusion end is provided on the extrusion mechanism, the extrusion end of the extrusion mechanism is installed in the aluminum material accommodating cavity, the lower die is located at the lower end of the upper die, a non-equivalent channel is provided in the lower die, the non-equivalent channel is a vertical channel, and the upper end cross-section of the non-equivalent channel is larger than the lower end cross-section of the non-equivalent channel, the upper end of the non-equivalent channel is connected to the lower end of the aluminum material outflow channel, the non-equivalent channel is connected to the aluminum material accommodating cavity through the aluminum material outflow channel, and the lower end of the non-equivalent channel faces the horizontal sliding mechanism; The non-equivalent channels include a first channel, a second channel, and a third channel from top to bottom, the cross-sectional areas of the first channel, the second channel, and the third channel decrease in sequence, the lower end of the first channel is connected to the upper end of the second channel, and the lower end of the second channel is connected to the upper end of the third channel; A first smooth transition structure is provided between the lower end of the first channel and the upper end of the second channel, and a second smooth transition structure is provided between the lower end of the second channel and the upper end of the third channel; The horizontal sliding mechanism is a horizontal sliding block; or the horizontal sliding mechanism includes a linear motor and a supporting plate, the linear motor includes a mover structure and a guide rail structure, the supporting plate is installed on the mover structure, and the supporting plate is located between the lower mold and the linear motor.
2. The non-equal channel extrusion die for aluminum-titanium composite plate according to claim 1, It is characterized in that The extrusion mechanism is an extrusion rod.
3. A process for producing an aluminum-titanium composite plate using the aluminum-titanium composite plate non-equal channel extrusion die according to any one of claims 1 to 2, It is characterized in that Step 1: Heat the mold to melt the aluminum material in the aluminum material receiving cavity; Step 2: The extrusion mechanism extrudes the aluminum material in the aluminum material containing cavity, so that the aluminum material flows out through the aluminum material outflow channel and the non-equivalent channel onto the titanium plate on the horizontal sliding mechanism; Step 3: Control the horizontal sliding mechanism to slide so that the titanium plate and the lower die move relative to each other to ensure that the aluminum material is laid on the titanium plate and complete the extrusion process of the aluminum-titanium composite plate.
4. The production process of the aluminum-titanium composite plate using the aluminum-titanium composite plate non-equal channel extrusion die according to claim 3, It is characterized in that In step 1, the mold is placed in a constant temperature box at 450-500° C. to melt the aluminum material in the aluminum material receiving cavity.
5. The production process of aluminum-titanium composite plate according to claim 3, It is characterized in that The extrusion force of the extrusion mechanism is 250-300KN.
6. The production process of aluminum-titanium composite plate according to claim 3, It is characterized in that The ratio of the movement speed of the horizontal sliding mechanism to the extrusion speed of the extrusion mechanism is 0.6-1.0.