CN110947785A - Tubing extrusion die of Gleeble thermal simulation testing machine and use method thereof - Google Patents
Tubing extrusion die of Gleeble thermal simulation testing machine and use method thereof Download PDFInfo
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- CN110947785A CN110947785A CN201911275529.3A CN201911275529A CN110947785A CN 110947785 A CN110947785 A CN 110947785A CN 201911275529 A CN201911275529 A CN 201911275529A CN 110947785 A CN110947785 A CN 110947785A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
- B21C25/025—Selection of materials therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
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Abstract
The invention discloses a tubing extrusion die of a Gleeble thermal simulation testing machine and a use method thereof. The invention uses a Gleeble thermal simulation testing machine to simulate the extrusion of the pipe, and can quickly explore the new process parameters of the extrusion of the pipe by controlling the temperature rise and the temperature drop at different speeds and the extrusion deformation at different speeds and simultaneously recording the changes of parameters such as temperature, force, strain, stress and the like in the process of testing the extrusion.
Description
Technical Field
The invention belongs to the technical field of material processing, and particularly relates to a tubing extrusion die of a Gleeble thermal simulation testing machine and a using method thereof.
Background
Most parts are formed by die casting or extrusion, with extrusion being the most suitable form for some pipes. With the development of industry and the progress of science and technology in China, the quality requirement of people on extruded pipes is higher and higher. Therefore, the extrusion process parameters, the pipe microstructure and the mechanical properties have a crucial influence on the quality of the extruded product.
In the past, for the extrusion forming of a novel pipe, a large amount of tests are needed to explore the optimal process parameters, which greatly influences the development cycle and the production efficiency of a new product. In order to avoid material waste, seek reasonable extrusion process parameters and perform performance analysis on the formed pipe, the problem to be solved by the current pipe extrusion forming technology is urgent.
The Gleeble thermal simulation testing machine can dynamically simulate the metal heating and deformation process, measure the high-temperature mechanical property and stress-strain curve of the metal and the like. The problem of extrusion of the current pipe can be better solved by utilizing a Gleeble testing machine to simulate extrusion, and a proper Gleeble testing machine does not exist at present for simulating a pipe extrusion die.
Disclosure of Invention
In view of the above, the invention aims to provide a tubing extrusion die of a Gleeble thermal simulation testing machine and a use method thereof, and aims to overcome the defect that the tubing extrusion die suitable for being simulated by the Gleeble thermal simulation testing machine is not available at present.
In order to achieve the purpose of the invention, the technical scheme is as follows:
a tubing extrusion die of a Gleeble thermal simulation testing machine comprises a left die and a right die, one end face of the left die is connected with a mechanical transmission pressure head of the Gleeble thermal simulation testing machine, one end face of the right die is connected with a bearing pressure head of a Gleeble thermal simulation testing machine, and the other end surface of the left die is provided with a cylindrical left die convex block, the other end surface of the right die is provided with a hollow cylindrical extrusion concave cavity matched with the left die convex block, the diameter of the extrusion concave cavity is larger than that of the left die convex block, meanwhile, a positioning groove for installing an extrusion sample is arranged on the side surface opposite to the positive direction of the left die convex block in the extrusion concave cavity, in addition, a through hole is arranged on any other side surface of the extrusion concave cavity, a thermocouple is arranged in the through hole, one end of the thermocouple is connected with the extrusion sample, and the other end of the thermocouple is connected with a temperature control system of the Gleeble testing machine.
Preferably, the cylindrical surface of the left die projection and the inner surface of the extrusion cavity are each coated with graphite sheets and tantalum sheets.
Preferably, the size of the connecting end of the left die connected with the mechanical transmission pressure head is the same as that of the mechanical transmission pressure head; and the size of the connecting end of the right die connected with the bearing pressure head is the same as that of the bearing pressure head.
Preferably, the positioning groove is located at the center of the side surface of the extrusion concave cavity.
Preferably, the diameter of the opening of the through hole is 1 mm.
Preferably, a cylindrical left mold protruding block is fixed on the other end surface of the left mold or a detachable cylindrical left mold protruding block is arranged on the other end surface of the left mold.
More preferably, the size of the left die projection is the same as the size of the extruded sample.
More preferably, the material of the tubing extrusion die of the Gleeble thermal simulation testing machine is one of hot die steel, tungsten carbide or nickel alloy.
Preferably, the Gleeble thermal simulation testing machine can simulate extrusion processes under different environments, more accurately reflect actual extrusion conditions, analyze changes of a plastic deformation area, an elastic deformation area and the like of the metal flow deformation in the extrusion process through parameters such as extrusion force, stress, strain and the like obtained by Gleeble simulation extrusion, and predict information such as flow behavior, possibly generated defects, optimal process parameters and the like of the metal in the forming process.
A method for using a tubing extrusion die of a Gleeble thermal simulation testing machine comprises the following steps:
paving graphite sheets and tantalum sheets on the cylindrical surface of the left die bump and the inner surface of the extrusion concave cavity, and then loading the left die, the left die bump and the right die into a Gleeble-3800 thermal simulation tester for clamping and fixing;
welding one end of a thermocouple at the center of an extruded sample, connecting the other end of the thermocouple into a computer control system through a small hole with the diameter of 1mm on a right die to accurately measure the temperature of the sample, clamping the extruded sample by using forceps, clamping the right end of the extruded sample into a positioning groove in an extrusion concave cavity of the right die, and slowly driving the left die to move right by using a hydraulic driving device so that a convex block of the left die is contacted with the left end surface of the cylindrical sample to firmly fix the cylindrical sample;
step three, setting parameters of the extruded sample: programming the heating rate, the peak temperature, the heat preservation time, the cooling mode and the cooling rate into a Gleeble thermal simulation testing machine program, operating the program, and controlling the Gleeble thermal simulation testing machine by the system according to the set parameters to extrude the extruded sample into a corresponding pipe;
and step four, after the extrusion process is finished, rapidly cooling the die, slowly moving the left die away, and as the graphite sheet and the tantalum sheet are paved on the surface of the die, the graphite sheet and the tantalum sheet have the functions of lubricating and accelerating heat conduction, the extruded tube sample cannot be stuck on the die, and the extruded tube sample is clamped out by using tweezers, so that the sample is demoulded.
The invention has the beneficial effects that: the tubing extrusion die of the Gleeble thermal simulation testing machine can effectively solve the problem that the Gleeble thermal simulation testing machine cannot simulate to extrude tubing, the Gleeble thermal simulation testing machine is used for simulating tubing extrusion, the temperature rise and the temperature drop at different speeds and the extrusion deformation at different speeds are controlled in the simulation and test processes, and the change of parameters such as temperature, force, strain, stress and the like in the test extrusion process is recorded, so that the information such as the flowing behavior of metal in the forming process, the defects possibly generated, the optimal process parameters and the like can be rapidly explored, the time is saved, and the material waste is also saved; the left die convex block can be arranged to be detachable, so that the invention can manufacture corresponding dies aiming at cylindrical samples with different sizes, is suitable for extrusion molding of various materials and has wide application range; in addition, the pipe processed by the method can be subjected to microscopic analysis and mechanical test, so that the product quality is better improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a longitudinal section before extrusion of a tubing extrusion die of a Gleeble thermal simulation testing machine of the present invention;
FIG. 2 is a longitudinal section view of the tubing extrusion die of the Gleeble thermal simulation testing machine after extrusion;
FIG. 3 is a partial enlarged view of the through hole and the thermocouple in the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The Gleeble thermal simulation testing machine can dynamically simulate the metal heating and deformation process, measure the high-temperature mechanical property and the stress-strain curve of the metal and other technical advantages. Therefore, a die which is suitable for a Gleeble thermal simulation testing machine and can be used for simulating an extruded pipe is designed and developed.
According to the tubing extrusion die of the Gleeble thermal simulation testing machine, the Gleeble thermal simulation testing machine is used, temperature rise and temperature fall at different speeds and extrusion deformation at different speeds are controlled in the simulation and test processes, and changes of parameters such as temperature, force, strain and stress in the test extrusion process are recorded, so that new tubing extrusion process parameters can be rapidly explored, time is saved, and material waste is also saved.
The structural characteristics of the tubing extrusion die of the Gleeble thermal simulation testing machine related by the invention are specifically described below.
Example 1
The utility model provides a Gleeble thermal simulation testing machine tubular product extrusion die, includes left mould 1 and right mould 2, an terminal surface and the mechanical transmission pressure head of Gleeble thermal simulation testing machine of left side mould 1 are connected, just the size of left side mould link end is the same with the size of mechanical transmission pressure head, an terminal surface and the bearing pressure head of Gleeble thermal simulation testing machine of right side mould 2 are connected just the size of right side mould link end is the same with the size of bearing pressure head.
On the basis of the structure, as shown in fig. 1-3, another end face of the left die 1 is fixed with a cylindrical left die protruding block 11, another end face of the right die 2 is provided with a hollow cylindrical extrusion cavity 21 matched with the left die protruding block 11, the diameter of the extrusion cavity 21 is larger than that of the left die protruding block 11, meanwhile, a positioning groove 212 for installing an extrusion sample 3 is arranged on a side face 211 opposite to the forward direction of the left die protruding block 11 in the extrusion cavity 21, in addition, a through hole 213 with the diameter of 1mm is further arranged on any other side face of the extrusion cavity 21, a thermocouple 214 is arranged in the through hole 213, one end of the thermocouple 214 is connected with the extrusion sample 3, and the other end of the thermocouple 214 is connected with a temperature control system of a Gleeble testing machine. The temperature of the extruded sample 3 is communicated to the computer control system by the thermocouple 214 to ensure that the temperature of the sample can be detected in real time.
In addition, in order to facilitate smooth demolding of the extruded tube, in the present invention, graphite sheets and tantalum sheets are laid on the cylindrical surface of the left die projection 11 and the inner surface of the extrusion concave cavity 21, respectively.
In order to better adapt to the advantages of a Gleeble thermal simulation testing machine, the material of the pipe extrusion die is one of hot die steel, tungsten carbide or nickel alloy.
Example 2
On the basis of the structure of the tubing extrusion die of the Gleeble thermal simulation testing machine disclosed in the embodiment 1, further technical improvement is made. The structure of the concrete improvement is as follows:
the position of the positioning groove 212 is set at the center of the side 211 in the pressing cavity 21. Therefore, the extrusion sample 3 is conveniently clamped into the positioning groove to play a positioning role, and the sample is ensured to be in the middle position of the extrusion concave cavity 21. In addition, the diameter of the positioning groove 212 is the same as that of the pressed sample 3.
At the same time, in order to ensure the accuracy of the extrusion, it is also ensured that the dimensions of the left die projection 11 are the same as those of the extruded sample 3.
Example 3
On the basis of the structure of the tubing extrusion die of the Gleeble thermal simulation testing machine disclosed in the embodiment 2, further technical improvement is made. The structure of the concrete improvement is as follows:
the other end surface of the left die 1 is provided with a detachable cylindrical left die convex block 11. The inner diameter of the extruded tube 3' is the same as the diameter of the left die projection 11. Therefore, the inner diameter of the extruded tube 3' can be determined by replacing the diameter of the left die projection 11. Therefore, pipes with various specifications can be conveniently extruded.
Having described the structure of the present invention in detail above, examples 4-5 below represent the use of the tubing extrusion die and Gleeble thermal simulation test machine according to the present invention, primarily in the form of operational steps.
Example 4:
taking a 6005A aluminum alloy cylindrical sample with the diameter of 10mm and the height of 15mm as an example, the implementation method is as follows:
paving graphite sheets and tantalum sheets on the cylindrical surface of the left die bump and the inner surface of the extrusion concave cavity, and then loading the left die, the left die bump and the right die into a Gleeble-3800 thermal simulation tester for clamping and fixing;
and step two, after one end of a thermocouple is welded at the center of the aluminum alloy cylindrical sample, the other end of the thermocouple passes through a small hole of 1mm on the right die and is connected into a computer control system to accurately measure the temperature of the sample, tweezers are used for clamping the aluminum alloy cylindrical sample, the right end of the aluminum alloy cylindrical sample is clamped into a positioning groove in the right die extrusion concave cavity, and a hydraulic driving device is used for slowly driving the left die to move right, so that a convex block of the left die is in contact with the left end face of the cylindrical sample, and the cylindrical sample is firmly fixed.
And step three, the Gleeble thermal simulation testing machine can program to accurately control parameters such as heating speed, peak temperature, heat preservation time, cooling mode and cooling speed. According to the established protocol: heating an aluminum alloy cylindrical sample to 490 ℃ at the speed of 10 ℃/s, preserving heat for 60s to eliminate temperature deviation, setting the left die to move 12mm to the right, setting the left die displacement speed to be 1mm/s (extrusion deformation rate), keeping the extrusion state for 2s after the extrusion is in place, running a program, and controlling a Gleeble thermal simulation testing machine to extrude the aluminum alloy cylindrical test according to the program set by the system according to the test scheme so as to reach 80% of deformation, so as to extrude the aluminum alloy cylindrical test into a corresponding pipe.
And step four, after the extrusion process is finished, rapidly cooling the die and slowly removing the left die. Because graphite flake and tantalum piece have been spread on the mould surface, have the effect of lubricating and accelerating heat conduction, on the sample can not glue the mould after the extrusion, press from both sides out extrusion back tubular product sample with tweezers, can easily realize the sample drawing of patterns.
After extrusion is completed, the Gleeble test machine automatically collects parameters such as temperature, force, stress, strain, displacement and the like in the extrusion process for further research, and after the extruded aluminum alloy sample is taken out, microscopic tissues under different extrusion parameters are observed and observed by using a microscope. By analyzing these parameters, the best extrusion process for aluminum alloy pipes was explored.
Example 5
Taking a 304 stainless steel cylindrical sample with the diameter of 10mm and the height of 15mm as an example, the implementation method is as follows:
paving graphite sheets and tantalum sheets on the cylindrical surface of the left die bump and the inner surface of the extrusion concave cavity, and then loading the left die, the left die bump and the right die into a Gleeble-3800 thermal simulation tester for clamping and fixing;
and step two, after one end of a thermocouple is welded at the center of the stainless steel cylindrical sample, the other end of the thermocouple passes through a small hole of 1mm on the right die and is connected to a computer control system to accurately measure the temperature of the sample, tweezers are used for clamping the stainless steel cylindrical sample, the right end of the aluminum alloy cylindrical sample is clamped into a positioning groove in a right die extrusion concave cavity, and a hydraulic driving device is used for slowly driving the left die to move right so that a left die bump is in contact with the left end face of the cylindrical sample to firmly fix the cylindrical sample.
And step three, the Gleeble thermal simulation testing machine can program to accurately control parameters such as heating speed, peak temperature, heat preservation time, cooling mode and cooling speed. According to the established protocol: heating a 304 stainless steel cylindrical sample to 1100 ℃ at the speed of 5 ℃/s, preserving heat for 60s to eliminate temperature deviation, setting the left die to move 12mm to the right and the left die displacement speed to be 0.5mm/s (extrusion deformation rate), keeping the extrusion state for 2s after the extrusion is in place, running a program, controlling a Gleeble thermal simulation testing machine by a system according to the program set by the test scheme to extrude the 304 stainless steel cylindrical test to reach 80% of deformation, and extruding to obtain a corresponding pipe.
And step four, after the extrusion process is finished, rapidly cooling the die and removing the left die. Because graphite flake and tantalum piece have been spread on the mould surface, have the effect of lubricating and accelerating heat conduction, on the sample can not glue the mould after the extrusion, press from both sides out extrusion back tubular product sample with tweezers, can easily realize the sample drawing of patterns.
After extrusion is completed, a Gleeble test machine automatically acquires extrusion parameters such as temperature, force, strain, stress, displacement and the like in the extrusion process, and simultaneously takes out the extruded stainless steel pipe, and observes microstructures under different extrusion parameters by using a microscope. By analyzing these parameters, the best stainless steel tubing extrusion process was explored.
Claims (9)
- The pipe extrusion die comprises a left die and a right die, wherein one end face of the left die is connected with a mechanical transmission pressure head of the Gleeble thermal simulation testing machine, one end face of the right die is connected with a bearing pressure head of the Gleeble thermal simulation testing machine, and the pipe extrusion die is characterized in that:another terminal surface of left side mould is provided with a columniform left side mould lug, another terminal surface of right side mould seted up a hollow, with a left side mould lug matched with columniform extrusion cavity, and the diameter of this extrusion cavity is greater than the diameter of left side mould lug, meanwhile in the extrusion cavity, with be provided with a constant head tank that is used for installing the extrusion sample on the positive relative side of left side mould lug, in addition still seted up a through-hole on any other side of extrusion cavity, install the thermocouple in the through-hole, the one end of thermocouple with the extrusion sample links to each other, and the other end links to each other with the temperature control system of Gleeble testing machine.
- 2. The Gleeble thermal simulation tester tube extrusion die of claim 1, wherein the cylindrical surface of the left die projection and the inner surface of the extrusion cavity are both paved with graphite sheets and tantalum sheets.
- 3. The tubing extrusion die of the Gleeble thermal simulation testing machine according to claim 1, wherein the size of the connecting end of the left die connected with the mechanical transmission pressure head is the same as the size of the mechanical transmission pressure head; and the size of the connecting end of the right die connected with the bearing pressure head is the same as that of the bearing pressure head.
- 4. The Gleeble thermal simulation tester tube extrusion die of claim 1, wherein the positioning groove is located at a central position of a side surface of the positioning groove in the extrusion cavity.
- 5. The Gleeble thermal simulation tester tubing extrusion die of claim 1, wherein the opening diameter of the through hole is 1 mm.
- 6. The Gleeble thermal simulation testing machine pipe extrusion die of any one of claims 1-5, wherein a cylindrical left die projection is fixed on the other end face of the left die or a detachable cylindrical left die projection is arranged on the other end face of the left die.
- 7. The Gleeble thermal simulation tester tubing extrusion die of claim 6, wherein the left die tab is the same size as the extruded specimen.
- 8. The Gleeble thermal simulation testing machine pipe extrusion die of claim 7, wherein the material of the Gleeble thermal simulation testing machine pipe extrusion die is one of hot die steel, tungsten carbide or nickel alloy.
- 9. Use of a Gleeble thermal simulation tester tubing extrusion die as claimed in any one of claims 1 to 8, characterized in that it comprises the steps of:paving graphite sheets and tantalum sheets on the cylindrical surface of the left die bump and the inner surface of the extrusion concave cavity, and then loading the left die, the left die bump and the right die into a Gleeble-3800 thermal simulation tester for clamping and fixing;welding one end of a thermocouple at the center of an extruded sample, connecting the other end of the thermocouple into a computer control system through a small hole with the diameter of 1mm on a right die to accurately measure the temperature of the sample, clamping the extruded sample by using forceps, clamping the right end of the extruded sample into a positioning groove in an extrusion concave cavity of the right die, and slowly driving the left die to move right by using a hydraulic driving device so that a convex block of the left die is contacted with the left end surface of the cylindrical sample to firmly fix the cylindrical sample;step three, setting parameters of the extruded sample: programming the heating rate, the peak temperature, the heat preservation time, the cooling mode and the cooling rate into a Gleeble thermal simulation testing machine program, operating the program, and controlling the Gleeble thermal simulation testing machine by the system according to the set parameters to extrude the extruded sample into a corresponding pipe;and step four, after the extrusion process is finished, rapidly cooling the die, slowly moving the left die away, and as the graphite sheet and the tantalum sheet are paved on the surface of the die, the graphite sheet and the tantalum sheet have the functions of lubricating and accelerating heat conduction, the extruded tube sample cannot be stuck on the die, and the extruded tube sample is clamped out by using tweezers, so that the sample is demoulded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911275529.3A CN110947785A (en) | 2019-12-12 | 2019-12-12 | Tubing extrusion die of Gleeble thermal simulation testing machine and use method thereof |
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| CN201911275529.3A CN110947785A (en) | 2019-12-12 | 2019-12-12 | Tubing extrusion die of Gleeble thermal simulation testing machine and use method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948016A (en) * | 2020-08-19 | 2020-11-17 | 燕山大学 | Matched die and method for preparing fiber reinforced composite board by thermal simulation testing machine |
| CN112129631A (en) * | 2020-09-16 | 2020-12-25 | 浙江久立特材科技股份有限公司 | Cold deformation die working curve design method based on full-size strain strengthening |
| CN113075009A (en) * | 2021-03-23 | 2021-07-06 | 中北大学 | Die inductive-resistant choke device formed by extrusion molding of Gleeble-3500 testing machine |
-
2019
- 2019-12-12 CN CN201911275529.3A patent/CN110947785A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948016A (en) * | 2020-08-19 | 2020-11-17 | 燕山大学 | Matched die and method for preparing fiber reinforced composite board by thermal simulation testing machine |
| CN112129631A (en) * | 2020-09-16 | 2020-12-25 | 浙江久立特材科技股份有限公司 | Cold deformation die working curve design method based on full-size strain strengthening |
| CN113075009A (en) * | 2021-03-23 | 2021-07-06 | 中北大学 | Die inductive-resistant choke device formed by extrusion molding of Gleeble-3500 testing machine |
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