CN113458721B - Preparation method of high-strength aluminum alloy guide bar grooved needle connecting rod - Google Patents
Preparation method of high-strength aluminum alloy guide bar grooved needle connecting rod Download PDFInfo
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- CN113458721B CN113458721B CN202110673251.6A CN202110673251A CN113458721B CN 113458721 B CN113458721 B CN 113458721B CN 202110673251 A CN202110673251 A CN 202110673251A CN 113458721 B CN113458721 B CN 113458721B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention discloses a preparation method of a high-strength aluminum alloy guide bar groove needle connecting rod, which comprises the following steps: step 100, cutting an aluminum alloy raw material into a bar stock with a preset size, heating the bar stock, preserving heat and then performing die forging to obtain a forged piece; step 200, cooling the forged piece after trimming and polishing; step 300, carrying out solution treatment on the cooled forging, and then placing the forging in water for cooling to finish quenching of the forging; step 400, carrying out aging treatment on the forge piece for different durations at a plurality of different temperatures, and placing the forge piece subjected to the aging treatment into a furnace with a preset temperature for heat preservation so as to obtain a plurality of batches of aluminum alloy guide bar slot needle connecting rod finished products under different treatment conditions; 500, sampling the finished product of the aluminum alloy guide bar slot needle connecting rod of each batch; and step 600, performing a tensile test on all the second samples. The invention can stably prepare the guide bar slot needle connecting rod with each index meeting the preset target.
Description
Technical Field
The invention relates to the technical field of warp knitting machines, in particular to a preparation method of a high-strength aluminum alloy guide bar groove needle connecting rod.
Background
The knitting mechanism of a warp knitting machine is generally driven by a cam or an eccentric connecting rod, wherein a guide bar groove needle connecting rod is always under the working conditions of high speed, high abrasion and large centrifugal load, so that the guide bar groove needle connecting rod has the requirements of higher fatigue impact resistance, strength, toughness, smaller mass and the like. And the forged 7022 aluminum alloy is widely applied to industries such as automobile parts, textile machinery and the like by virtue of the characteristics of high strength, light weight, easiness in forming and the like. The guide bar grooved needle connecting rod formed by forging by adopting 7022 aluminum alloy as a raw material has high tensile strength, yield strength, elongation and the like.
At present, the existing standards require the following for the product performance of 7022 aluminum alloys: GB/T3880.2-2012 Standard: under the condition of T6, the tensile strength Rm is more than or equal to 410MPa, the yield strength is more than or equal to 330MPa, and the elongation after fracture is more than or equal to 3 percent. Based on the definition and specification of 7022 aluminum alloy in the standard, the performance requirements of the current aging treatment process can be met, but with the increase of the application degree of 7022 aluminum alloy and the popularization of 7022 aluminum alloy in various industries, more and more parts have individual requirements, and the requirements on the performance of 7022 aluminum alloy forging pieces are continuously improved. For example, the 7022 aluminum alloy sley bar grooved needle connecting rod for textile machinery is further required to have tensile strength of more than 550MPa and yield strength of more than 450MPa, and the specific performance requirements are as follows: the tensile strength is more than or equal to 550MPa, the yield strength is more than or equal to 450MPa, and the elongation is more than or equal to 10%.
The 7022 aluminum alloy is an aluminum alloy with extremely high alloying degree in Al-Zn-Mg-Cu alloy, and has high content of Mg and Zn elements, so that a main strengthening phase of the 7022 aluminum alloy is MgZn2, and meanwhile, because the alloying degree is high, the sensitivity of the 7022 aluminum alloy to an aging precipitation phase is increased, the aging precipitation phase of the 7022 aluminum alloy is extremely difficult to control in the aging treatment process, particularly, the 7022 aluminum alloy can rapidly enter the natural aging process at room temperature, the subsequent change of the performance of the 7022 aluminum alloy can be greatly influenced, and the target tensile strength, yield strength and elongation of the connecting rod of the comb grooved needle can not be easily achieved, so that an aluminum alloy aging heat treatment method which can stably prepare the connecting rod of the comb grooved needle and meets the target tensile strength, yield strength and elongation of the connecting rod of the comb grooved needle is lacked in the prior art.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength aluminum alloy guide bar grooved needle connecting rod, and aims to solve the technical problem that an aging heat treatment method for stably preparing an aluminum alloy meeting the target tensile strength, yield strength and elongation of the guide bar grooved needle connecting rod is lacked in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a preparation method of a high-strength aluminum alloy guide bar groove needle connecting rod comprises the following steps:
step 100, cutting an aluminum alloy raw material into a bar stock with a preset size, heating the bar stock, preserving heat and then performing die forging to obtain a forged piece;
step 200, cooling the forged piece after trimming and polishing;
step 300, carrying out solution treatment on the cooled forge piece, and then placing the cooled forge piece into water for cooling to finish quenching of the forge piece;
step 400, carrying out aging treatment on the forge piece for different durations at a plurality of different temperatures, and placing the forge piece subjected to the aging treatment into a furnace with a preset temperature for heat preservation so as to obtain a plurality of batches of aluminum alloy guide bar slot needle connecting rod finished products under different treatment conditions;
500, sampling the finished product of the aluminum alloy guide bar slot needle connecting rod of each batch to obtain a first sample, and cutting and sampling the same position of the first sample of all batches to obtain a second sample with the same size;
and 600, performing a tensile test on all the second samples to obtain tensile performance parameters of all the second samples, and matching the tensile performance parameters to the finished products of the aluminum alloy guide bar slot needle connecting rods of corresponding batches.
As a preferred embodiment of the present invention, the step 400 further includes:
carrying out aging treatment on the aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 110 ℃, wherein the time of the aging treatment is 1-19 h respectively, taking out a batch of finished products every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 70min until the aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature;
and (2) carrying out aging treatment on the aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 130 ℃, wherein the time of the aging treatment is 1-19 h respectively, taking out a batch of finished products every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 75min until the aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature.
As a preferred embodiment of the present invention, the step 100 further includes: and heating the bar stock to 480-530 ℃, preserving heat for 2-3 h, and adjusting the furnace temperature to be more than or equal to 510 ℃ when the bar stock is ready to be discharged from the furnace, so that the discharging temperature of the bar stock is more than or equal to 510 ℃, and performing die forging on the bar stock in a 1600t press.
As a preferred embodiment of the present invention, the step 500 further includes:
step 501, conveying the finished product of the aluminum alloy guide bar groove needle connecting rod to the next processing link through a conveyor belt, and sampling the finished product of the aluminum alloy guide bar groove needle connecting rod on the conveyor belt to obtain a connecting rod sample;
502, transferring the connecting rod samples to an operation platform one by one, and fixing the connecting rod samples on the operation platform through a fixing device;
and 503, cutting the fixed connecting rod sample into a second sample through a cutting device.
As a preferred embodiment of the present invention, the step 600 further includes:
step 601, fixing two ends of the second sample through a clamping device;
step 602, stretching both ends of the fixed second sample at a constant speed by a stretching device, and simultaneously recording axial stretching load data borne by the stretched second sample;
step 603, observing the conditional yield limit σ 0.2, strength limit σ b, elongation δ and reduction of area ψ of the second sample being stretched during the stretching process.
As a preferable scheme of the invention, the cutting device comprises a driving assembly fixedly mounted on the operating platform, the driving assembly is connected with a combined blade for cutting and clamping a sample, the driving assembly reciprocates vertically right above the fixed seat, and the bottom end of the driving assembly is connected with the combined blade for cutting and clamping the sample;
the combined blade comprises a first end blade connected to one side of the bottom end of the driving assembly and a second end blade connected to the other side of the bottom end of the driving assembly;
the first end blade and the second end blade are U-shaped blades with two openings opposite to each other, and the two sides of the first end blade and the second end blade are detachably connected through the side cutting blades.
As a preferable aspect of the present invention, the clamping device includes a longitudinal limiting member disposed inside the first end blade and the second end blade, and the longitudinal limiting member is a longitudinal protrusion fixedly mounted on the first end blade or the second end blade;
the operation platform is provided with a group of placing grooves in a clamping manner, sealing pieces are placed in the placing grooves, and the first end blade and the second end blade can be clamped on the sealing pieces in a one-to-one correspondence manner.
As a preferred scheme of the invention, the driving assembly comprises a group of hollow guide rods fixedly mounted on the fixed seat, a support frame body is arranged between the hollow guide rods, two ends of the support frame body are both connected with sliding blocks, the two sliding blocks are nested in the hollow guide rods in a one-to-one correspondence and longitudinally slidable manner, the bottoms of the sliding blocks are connected to the bottom end of the support frame body through elastic resetting pieces, the tops of the sliding blocks are connected to the top end of the support frame body through elastic extrusion air bags, and the elastic extrusion air bags are connected with external air pump equipment through air pressure charging and discharging pipes;
the first end blade and the second end blade can be linearly and slidably mounted at the bottom of the support frame body along the extension direction of the bottom of the support frame body.
As a preferable aspect of the present invention, the first end blade and the second end blade are higher than the second sample;
the stretching device comprises load sensors fixed on the outer sides of the first end blade and the second end blade, a traction plate is fixedly connected to the outer side of each load sensor, the top end of the traction plate can be linearly and slidably mounted on the support frame body, and the support frame body drives the traction plate through a motor at a constant speed.
As a preferable scheme of the invention, two ends of the side cutting blade are connected with connecting plates, grooves for nesting the connecting plates are respectively formed in the first end blade and the second end blade, clamping plates are respectively rotatably mounted on the upper side and the lower side of one end of each connecting plate through torsion springs, opposite ends of the two clamping plates are connected through a first air bag, and the first air bag is vertically connected with a second air bag.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the guide bar groove needle connecting rod with various indexes meeting the preset target can be stably prepared under the aging treatment condition straight line within the range of 110-130 ℃ and 7-13 h, namely the tensile strength of the guide bar groove needle connecting rod is more than or equal to 550MPa, the yield strength is more than or equal to 450MPa, and the elongation is more than or equal to 10%.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic flow diagram of the process;
FIG. 2 is a schematic structural diagram of a 7022 aluminum alloy guide bar slot needle connecting rod for textile machinery;
FIG. 3 is a drawing of the dimensions of a tensile specimen;
fig. 4 is a schematic view of a tensile specimen sampling position, and B is a tensile specimen sampling position. (ii) a
FIG. 5 is a schematic overall structure diagram according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a web in an embodiment of the present invention.
The reference numerals in the drawings denote the following, respectively:
1-an operation platform; 2-a cutting device; 3-a clamping device; 4-stretching device
21-a drive assembly; 22-a composite blade;
31-longitudinal limit; 32-sealing;
211-hollow guide bar; 212-support frame body; 213-a slide block; 214-a resilient return member; 215-elastic squeeze balloon; 216-pneumatic charging and discharging pipe;
221-a first end blade; 222-a second end blade; 223-side cutting blade; 224-a connecting plate; 225-cardboard; 226-a first balloon; 227-a second bladder;
41-load sensor; 42-traction plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
As shown in fig. 1-6, a method for preparing a high-strength aluminum alloy guide bar grooved needle connecting rod comprises the following steps:
step 100, cutting an aluminum alloy raw material into a bar stock with a preset size, heating the bar stock, preserving heat and then performing die forging to obtain a forged piece;
step 200, cooling the forged piece after trimming and polishing;
step 300, carrying out solution treatment on the cooled forge piece, and then placing the cooled forge piece into water for cooling to finish quenching of the forge piece;
step 400, carrying out aging treatment on the forge piece for different durations at a plurality of different temperatures, and placing the forge piece subjected to the aging treatment into a furnace with a preset temperature for heat preservation so as to obtain a plurality of batches of aluminum alloy guide bar slot needle connecting rod finished products under different treatment conditions;
500, sampling the finished product of the aluminum alloy guide bar slot needle connecting rod of each batch to obtain a first sample, and cutting and sampling the same position of the first sample of all batches to obtain a second sample with the same size;
and 600, performing a tensile test on all the second samples to obtain tensile performance parameters of all the second samples, and matching the tensile performance parameters to the finished products of the aluminum alloy guide bar slot needle connecting rods of corresponding batches.
Wherein, the step 400 further comprises:
carrying out aging treatment on the aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 110 ℃, wherein the time of the aging treatment is 1-19 h respectively, taking out a batch of finished products every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 70min until the aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature;
and (2) carrying out aging treatment on the aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 130 ℃, wherein the time of the aging treatment is 1-19 h respectively, taking out a batch of finished products every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 75min until the aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature.
Wherein the aluminum alloy raw material is 7022 aluminum alloy.
The 7022 aluminum alloy is an aluminum alloy with a very high alloying degree in Al-Zn-Mg-Cu alloy. For Al-Zn-Mg-Cu alloys, the widely accepted precipitation sequence is supersaturated solid solution SSS → GP zone → metastable phase η '→ η MgZn2, and the main strengthening phases are GP zone, metastable phase η' and η MgZn 2. The 7022 aluminum alloy belongs to an Al-Zn-Mg-Cu alloy with high alloy content, wherein Mg and Zn elements contain more gold, so that the solid solution density is high, the sensitivity to precipitated phases is higher during aging, namely, the phase change processes among GP zones, metastable phases eta' and eta MgZn2 are sensitive and difficult to control during aging, moreover, the 7022 aluminum alloy has relatively strong capability of natural aging at room temperature after extrusion forming, the influence on the performance of the alloy is great, the phenomenon can greatly influence the subsequent obtaining of high performance through artificial aging, and particularly, the aluminum alloy extruded section with tensile strength improved to 550MPa and yield strength higher than 450MPa is difficult to obtain.
Wherein, the method specifically comprises the step of cutting an aluminum alloy raw material into
And heating the bar stock to 480-530 ℃, preserving heat for 2-3 h, and finally performing die forging on the bar stock by using a 1600t press under the condition that the tapping temperature of the bar stock is not lower than 510 ℃. The specific operation method of step 300 is as follows: carrying out solution treatment on the forge piece for 420min at 470 ℃, and after the solution treatment is finished, rapidly transferring the forge piece to water at 60-70 ℃ for cooling for 20min, wherein the quenching transfer time is not more than 15 s. Wherein, it also includesComprises the following steps: and 500, sampling the finished product, performing a tensile test on the sample, and acquiring test data according to the tensile test result.
Wherein, the step 100 further comprises: and heating the bar stock to 480-530 ℃, preserving heat for 2-3 h, and adjusting the furnace temperature to be more than or equal to 510 ℃ when the bar stock is ready to be discharged from the furnace, so that the discharging temperature of the bar stock is more than or equal to 510 ℃, and performing die forging on the bar stock in a 1600t press.
The forging is subjected to aging treatment under different conditions for experiments, and the specific experimental conditions are as follows:
1. carrying out aging treatment on the 7022 aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 70 ℃, wherein the time of the aging treatment is 1-19 h respectively, carrying out sampling tests every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 60min until the 7022 aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature;
2. aging the 7022 aluminum alloy guide bar grooved needle connecting rod forge piece at 90 ℃, wherein the aging time is 1-19 h, sampling test forge pieces are carried out every 3h, the forge pieces are placed into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and the 7022 aluminum alloy guide bar grooved needle connecting rod forge piece reaches the preset temperature after the heat preservation is carried out for 65 min;
3. carrying out aging treatment on the 7022 aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 110 ℃, wherein the time of the aging treatment is 1-19 h respectively, carrying out sampling tests every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 70min until the 7022 aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature;
4. carrying out aging treatment on the 7022 aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 130 ℃, wherein the time of the aging treatment is 1-19 h respectively, carrying out sampling tests every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 75min until the 7022 aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature;
5. carrying out aging treatment on the 7022 aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 150 ℃, wherein the time of the aging treatment is 1-19 h respectively, sampling tests are carried out every 3h, the forge piece is placed into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and the 7022 aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature after the furnace temperature is preserved for 80 min;
6. the method comprises the following steps of carrying out two-stage aging treatment on the 7022 aluminum alloy guide bar slot needle connecting rod forge piece under the conditions that the aging system is 120 ℃,6h +172 ℃ and 8h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, carrying out heat preservation for 72min, enabling the 7022 aluminum alloy guide bar slot needle connecting rod forge piece to reach the preset temperature, and fully cooling the forge piece between two times of aging treatment.
And obtaining each finished product subjected to the aging treatment, and carrying out a test experiment on the finished products, wherein the test results are shown in the following table.
The tensile strength, yield strength and elongation of the 7022 aluminum alloy guide bar groove needle connecting rod are continuously changed along with the change of the aging time and the aging temperature, so that various indexes of the forge piece meet the preset target when the forging piece is aged for 10h under the condition that the aging temperature is 110 ℃ and aged for 7h and 13h under the condition that the forging piece is 130 ℃ can be seen in combination with the above table, namely the tensile strength of the guide bar groove needle connecting rod is more than or equal to 550MPa, the yield strength is more than or equal to 450MPa, and the elongation is more than or equal to 10%. Thereby obtaining the condition range value of the aging treatment method which stably prepares the aging treatment method meeting the target condition in the method.
Wherein, the step 500 further comprises:
step 501, conveying the finished product of the aluminum alloy guide bar slot needle connecting rod to the next processing link through a conveyor belt, and sampling the finished product of the aluminum alloy guide bar slot needle connecting rod on the conveyor belt to obtain a connecting rod sample;
502, transferring the connecting rod samples to an operation platform one by one, and fixing the connecting rod samples on the operation platform 1 through a fixing device;
and step 503, cutting the fixed connecting rod sample into a second sample through the cutting device 2.
Wherein, the step 600 further comprises:
step 601, fixing two ends of the second sample through a clamping device 3;
step 602, stretching both ends of the fixed second sample at a constant speed by a stretching device 4, and simultaneously recording axial stretching load data borne by the stretched second sample;
step 603, observing the conditional yield limit σ 0.2, strength limit σ b, elongation δ and reduction of area ψ of the second sample being stretched during the stretching process.
The cutting device 2 comprises a driving assembly 21 fixedly mounted on the operating platform 1, a combined blade 22 for cutting and clamping a sample is connected to the driving assembly 21, the driving assembly 21 reciprocates vertically above the fixed seat 1, and the combined blade 22 for cutting and clamping the sample is connected to the bottom end of the driving assembly 21;
the composite blade 22 includes a first end blade 221 connected to one side of the bottom end of the driving assembly 21, and a second end blade 222 connected to the other side of the bottom end of the driving assembly 21;
the first end blade 221 and the second end blade 222 are U-shaped blades with two openings facing each other, and both sides of the first end blade 221 and the second end blade 222 are detachably connected by a side cutting blade 223.
When the driving assembly 21 is operated, the driving assembly 21 first descends to the topmost end, the combined blade 22 cuts the sample, then the driving assembly 21 gradually ascends to the topmost end, and at the stage of completely separating from the operation platform 1 in the ascending process of the driving assembly 21, the first end blade 221 and the second end blade 222 are driven to perform transverse distancing movement, and the distancing movement of the first end blade 221 and the second end blade 222 just realizes the stretching process of the sample.
The operation platform 1 is a platform which is used for clamping and fixing a sample by an existing mechanical arm and has a bearing capacity.
The clamping device 3 includes a longitudinal limiting member 31 disposed inside the first end blade 221 and the second end blade 222, and the longitudinal limiting member 31 is a longitudinal protrusion fixedly mounted on the first end blade 221 or the second end blade 222; a group of placing grooves are clamped on the operating platform 1, the sealing sheet 32 is placed in the placing grooves, and the first end blade 221 and the second end blade 222 can be correspondingly clamped on the sealing sheet 32 one by one.
The side edge of the sample is penetrated through the longitudinal knife bulge so as to increase the friction force of the sample stretching in the transverse direction, and the side edge of the sample is deformed to a certain degree along with the penetration of the longitudinal knife bulge, and the sample is fixed by utilizing the deformation.
The driving assembly 21 includes a group of hollow guide rods 211 fixedly mounted on the fixed seat 1, a support frame body 212 is disposed between the group of hollow guide rods 211, both ends of the support frame body 212 are connected with sliding blocks 213, the two sliding blocks 213 are nested in the hollow guide rods 211 in a one-to-one correspondence and longitudinally slidable manner, the bottom of the sliding block 213 is connected to the bottom end of the support frame body 212 through an elastic resetting member 214, the top of the sliding block 213 is connected to the top end of the support frame body 212 through an elastic extrusion air bag 215, and the elastic extrusion air bag 215 is connected to an external air pump device through an air pressure inflation and deflation tube 216;
the first end blade 221 and the second end blade 222 are both linearly slidably mounted on the bottom of the support frame 212 along the extension direction of the bottom of the support frame 212.
The linear motor and other electric control structures in the prior art mainly control the lifting process of one component through a control circuit, and the scheme has the main problems of high cost and difficulty in popularization and promotion.
The driving assembly 21 of the present invention is mainly used for testing samples, and has experimental properties, so the device is used less times, and a simple structure can be adopted to reduce the cost.
The elastic pressing air bag 215 and the elastic resetting piece 214 are matched with each other to realize the purpose, the pressing is driven by the elastic pressing air bag 215, and the elastic resetting piece 214 resets and ascends.
In order to avoid that the elastic extrusion airbag 215 overflows out of the hollow guide rod 211 in the expansion process, the width of the longitudinal groove of the hollow guide rod 211 can be reduced, and the connecting part of the sliding block 213 and the support frame body 212 is concave inwards, so that the deformation degree of the elastic extrusion airbag 215 overflowing out of the hollow guide rod 211 in the expansion process, namely the overflowing difficulty, can be improved, and the stiffness coefficient of the elastic extrusion airbag 215 can be further improved.
Wherein the first end blade 221 and the second end blade 222 are both higher than the second sample;
the stretching device 4 comprises a load sensor 41 fixed on the outer sides of the first end blade 221 and the second end blade 222, a traction plate 42 is fixedly connected on the outer side of the load sensor 41, the top end of the traction plate 42 is linearly slidably mounted on the support frame body 212, and the support frame body 212 drives the traction plate 42 at a constant speed through a motor.
The two ends of the side cutting blade 223 are connected with a connecting plate 224, grooves for nesting the connecting plate 224 are formed in the first end blade 221 and the second end blade 222, clamping plates 225 are rotatably mounted on the upper side and the lower side of one end of the connecting plate 224 through torsion springs, opposite ends of the two clamping plates 225 are connected through a first air bag 226, and the first air bag 226 is vertically connected with a second air bag 227.
When the connecting plate 224 is artificially nested in the groove, the two clamping plates 225 are automatically clamped to two sides of the groove under the action of the torsion spring, so that the connecting plate 224 is locked in the groove, after the first air bag 226 is inflated, the first air bag 226 extrudes the clamping plates 225 to reversely rotate, so that the locking of the clamping plates 225 is released, and as the elastic coefficient of the first air bag 226 is far smaller than that of the second air bag 227, the first air bag 226 is completely expanded, the second air bag 227 is expanded, and the connecting plate 224 is ejected out of the groove through the expansion of the second air bag 227 in the front-back direction, so that the side cutting blade 223 automatically falls off, and the tensile data are prevented from being influenced by the side cutting blade 223.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (8)
1. A preparation method of a high-strength aluminum alloy guide bar slot needle connecting rod is characterized by comprising the following steps: the method comprises the following steps:
step 100, cutting an aluminum alloy raw material into a bar stock with a preset size, heating the bar stock, preserving heat and then performing die forging to obtain a forged piece;
step 200, cooling the forged piece after trimming and polishing;
step 300, carrying out solution treatment on the cooled forge piece, and then placing the cooled forge piece into water for cooling to finish quenching of the forge piece;
step 400, carrying out aging treatment on the forge piece for different durations at a plurality of different temperatures, and placing the forge piece subjected to the aging treatment into a furnace with a preset temperature for heat preservation so as to obtain a plurality of batches of aluminum alloy guide bar slot needle connecting rod finished products under different treatment conditions;
step 500, sampling the finished product of the aluminum alloy guide bar slot needle connecting rod of each batch to obtain a first sample, cutting and sampling the same position of the first sample of all batches to obtain a second sample of the same size, and further comprising:
step 501, conveying the finished product of the aluminum alloy guide bar slot needle connecting rod to the next processing link through a conveyor belt, and sampling the finished product of the aluminum alloy guide bar slot needle connecting rod on the conveyor belt to obtain a connecting rod sample;
502, transferring the connecting rod samples to an operation platform one by one, and fixing the connecting rod samples on the operation platform (1) through a fixing device;
step 503, cutting the fixed connecting rod sample into a second sample through a cutting device (2);
wherein: the cutting device (2) comprises a driving assembly (21) fixedly installed on the operating platform (1), a combined blade (22) used for cutting and clamping a sample is connected to the driving assembly (21), the driving assembly (21) vertically reciprocates right above the operating platform (1), the bottom end of the driving assembly (21) is connected with the combined blade (22) used for cutting and clamping the sample, the driving assembly (21) comprises a group of hollow guide rods (211) fixedly installed on the operating platform (1), a supporting frame body (212) is arranged between the hollow guide rods (211), two ends of the supporting frame body (212) are respectively connected with sliding blocks (213), the two sliding blocks (213) are nested in the hollow guide rods (211) in a one-to-one correspondence and longitudinally sliding manner, and the bottoms of the sliding blocks (213) are connected to the bottom end of the supporting frame body (212) through elastic resetting pieces (214), the top of the sliding block (213) is connected to the top end of the support frame body (212) through an elastic extrusion air bag (215), and the elastic extrusion air bag (215) is connected with an external air pump device through an air pressure charging and discharging pipe (216);
the combined blade (22) comprises a first end blade (221) connected to one side of the bottom end of the driving assembly (21) and a second end blade (222) connected to the other side of the bottom end of the driving assembly (21), and both the first end blade (221) and the second end blade (222) can be linearly slidably mounted on the bottom of the supporting frame body (212) along the extending direction of the bottom of the supporting frame body (212);
and 600, performing a tensile test on all the second samples to obtain tensile performance parameters of all the second samples, and matching the tensile performance parameters to the finished products of the aluminum alloy guide bar slot needle connecting rods of corresponding batches.
2. The method for preparing a high-strength aluminum alloy guide bar slot needle connecting rod as claimed in claim 1, wherein the step 400 further comprises:
carrying out aging treatment on the aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 110 ℃, wherein the time of the aging treatment is 1-19 h respectively, taking out a batch of finished products every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 70min until the aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature;
and (2) carrying out aging treatment on the aluminum alloy guide bar slot needle connecting rod forge piece at the temperature of 130 ℃, wherein the time of the aging treatment is 1-19 h respectively, taking out a batch of finished products every 3h, placing the forge piece into a heating furnace for heat preservation after the furnace temperature reaches the preset temperature, and keeping the temperature for 75min until the aluminum alloy guide bar slot needle connecting rod forge piece reaches the preset temperature.
3. The method for preparing a high-strength aluminum alloy guide bar slot needle connecting rod as claimed in claim 2, wherein the step 100 further comprises: and heating the bar stock to 480-530 ℃, preserving heat for 2-3 h, and adjusting the furnace temperature to be more than or equal to 510 ℃ when the bar stock is ready to be discharged from the furnace, so that the discharging temperature of the bar stock is more than or equal to 510 ℃, and performing die forging on the bar stock in a 1600t press.
4. The method for preparing a high-strength aluminum alloy guide bar slot needle connecting rod as claimed in claim 3, wherein the step 600 further comprises:
step 601, fixing two ends of the second sample through a clamping device (3);
step 602, stretching both ends of the fixed second sample at a constant speed through a stretching device (4), and simultaneously recording axial stretching load data borne by the stretched second sample;
step 603, observing the conditional yield limit σ 0.2, strength limit σ b, elongation δ and reduction of area ψ of the second sample being stretched during the stretching process.
5. The method for preparing a high-strength aluminum alloy guide bar slot needle connecting rod as claimed in claim 4, wherein the first end blade (221) and the second end blade (222) are U-shaped blades with two oppositely-arranged openings, and both sides of the first end blade (221) and the second end blade (222) are detachably connected through a side cutting blade (223).
6. The method for preparing a high-strength aluminum alloy guide bar slot needle connecting rod as claimed in claim 5, wherein the clamping device (3) comprises a longitudinal limiting member (31) arranged at the inner side of the first end blade (221) and the second end blade (222), the longitudinal limiting member (31) is a longitudinal knife-edge fixedly mounted on the first end blade (221) or the second end blade (222);
the operation platform (1) is provided with a group of placing grooves in a clamping manner, the sealing sheets (32) are placed in the placing grooves, and the first end blade (221) and the second end blade (222) can be correspondingly clamped on the sealing sheets (32) one by one.
7. The method for preparing a high strength aluminum alloy guide bar slot needle connecting rod as claimed in claim 6, wherein the first end blade (221) and the second end blade (222) are higher than the second sample;
the stretching device (4) comprises load sensors (41) fixed on the outer sides of the first end blade (221) and the second end blade (222), a traction plate (42) is fixedly connected to the outer side of each load sensor (41), the top end of each traction plate (42) can be linearly installed on the support frame body (212) in a sliding mode, and the support frame body (212) is driven by a motor at a constant speed to drive the traction plate (42).
8. The method for preparing the high-strength aluminum alloy guide bar slot needle connecting rod as claimed in claim 7, wherein connecting plates (224) are connected to two ends of the side cutting blade (223), grooves for nesting the connecting plates (224) are formed in the first end blade (221) and the second end blade (222), clamping plates (225) are rotatably mounted on the upper side and the lower side of one end of each connecting plate (224) through torsion springs, opposite ends of the two clamping plates (225) are connected through a first air bag (226), and the first air bag (226) is vertically connected with a second air bag (227).
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