CN115889779A - Alloy powder pressing bar processing system - Google Patents
Alloy powder pressing bar processing system Download PDFInfo
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- CN115889779A CN115889779A CN202211313238.0A CN202211313238A CN115889779A CN 115889779 A CN115889779 A CN 115889779A CN 202211313238 A CN202211313238 A CN 202211313238A CN 115889779 A CN115889779 A CN 115889779A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an alloy powder pressing bar processing system which comprises a die sleeve for containing metal powder and a sheath, a pressure nozzle positioned at the lower part of the die sleeve and a gland positioned above the die sleeve, wherein a crevasse pestle and a measuring rod are arranged below the pressure nozzle, the measuring rod is fixedly connected with the crevasse pestle and positioned below the crevasse pestle, and the end part of the crevasse pestle is provided with a knife edge; the upper end of the measuring rod is provided with the upper contact rod, the lower end of the measuring rod is provided with the lower contact rod, the opening pestle is arranged below the opening pestle, the alloy powder pressing bar processing system is used for achieving extrusion forming of alloy powder to obtain the rod-shaped blank, resistance detection is conducted on the rod-shaped blank after forming, the density of the rod-shaped blank is measured, the blank sections with qualified density are screened, and separation between the rod-shaped blank and the sheath is achieved through structural matching of the measuring circuit and the opening pestle.
Description
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to an alloy powder pressing bar processing system.
Background
Powder metallurgy is a process technique for producing metal materials, composite materials and various types of products by using metal powder or alloy powder (or a mixture of metal powder and nonmetal powder) as a raw material and performing molding and sintering. In the method for forming the alloy powder, the extrusion of the alloy powder is a composite technology for preparing a section by using powder as a raw material and adopting a conventional extrusion process, and the alloy powder passes through a corresponding die orifice by extrusion to form a tubular or rod-shaped blank.
In the hot extrusion process, in order to keep the alloy powder to deform coordinately, the outer wall of the alloy powder is sheathed, the sheath needs to be peeled after a blank is obtained, the processes are multiple, the situation that the stress of the alloy powder is uneven in extrusion forming possibly occurs, the density of the blank is uneven, and the part with the density which does not reach the standard can occur in the blank.
Disclosure of Invention
The invention aims to solve the problems of subsequent peeling of a sheath and nonuniform density in extrusion molding of alloy powder in the prior art, and provides an alloy powder pressing bar processing system which is used for realizing sheath automatic separation and density detection of an alloy powder bar blank and assisting in removing unqualified density parts.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rack of the processing system for pressing alloy powder into bars is provided with a die sleeve for containing metal powder and a sheath, a pressure nozzle positioned at the lower part of the die sleeve and a gland positioned above the die sleeve. The frame is also provided with a lifting cylinder for driving the gland to move up and down, the gland moves up and can leave the die sleeve for feeding in the die sleeve, the gland moves down and can apply pressure to the metal powder in the die sleeve, and the metal powder is extruded from the pressing nozzle to form a target rod-shaped blank.
According to the invention, the metal powder is wrapped inside the sheath, the sheath comprises the metal layer and the isolating layer, and the isolating layer is used for isolating the metal powder from the metal layer, so that the metal powder and the metal layer can be conveniently stripped.
According to the invention, the crevasse pestle and the measuring rod are arranged below the pressure nozzle, and the measuring rod is fixedly connected with the crevasse pestle and is positioned below the crevasse pestle.
The broken pestle is rod-shaped, the axis of the broken pestle is perpendicular to the axis of the die sleeve, one end of the broken pestle is connected with the frame through the broken cylinder, and the other end of the broken pestle is provided with a knife edge which is used for puncturing the sheath of the bar blank.
Furthermore, an opening expanding block is arranged below the broken-opening pestle, and the opening expanding block is a conical block with a narrow upper part and a wide lower part. When the sheath is punctured by the opening pestle, the upper end of the flaring block is clamped into the opening, and the opening can be enlarged for separating the sheath from the rod-shaped embryo body.
Furthermore, the upper end of the measuring rod is provided with an upper contact rod, and the lower end of the measuring rod is provided with a lower contact rod. The axes of the upper contact rod and the lower contact rod are respectively vertical to the axis of the die sleeve, and the end parts of the upper contact rod and the lower contact rod are respectively used for being in contact with the rod-shaped blank body and measuring the resistance of the blank section between the upper contact rod and the lower contact rod of the rod-shaped blank body.
Further, the ends of the opening pestle, the upper contact rod and the lower contact rod are located on the same straight line, the straight line is parallel to the axis of the die sleeve, and when the knife edge of the opening pestle is in contact with the rod-shaped blank, the ends of the upper contact rod and the lower contact rod are also in contact with the rod-shaped blank.
Furthermore, the outside of the measuring rod is provided with a heat insulation sleeve which is used for forming a constant temperature field, so that the temperature of the embryo section between the upper contact rod and the lower contact rod is kept the same, and the temperature measuring environment of the resistor is ensured.
Furthermore, the lower end of the flaring block is located outside the heat-insulating sleeve, so that the rod-shaped blank is located inside the heat-insulating sleeve, and the sheath is located outside the heat-insulating sleeve.
Further, the alloy powder pressing bar processing system further comprises a measuring method of the density of the blank, and the measuring method comprises the following steps: measuring the resistance G of the embryo body by using a detection circuit;
when the resistance G is larger than the maximum value of the standard resistance, the compactness is insufficient; when the resistor G is within the standard resistor range, the density is qualified.
The method for obtaining the standard resistor comprises the following steps:
step A1: sampling a plurality of embryo rods with qualified compactness, measuring at corresponding temperature to obtain the resistance value of the equal-length embryo section of each embryo rod, recording, and sequencing the resistance values from bottom to top to obtain r1, r2, r3, · rn;
step A2: removing r1 and rn, obtaining an average value Rav of r2, r3, the.
Step A3: taking the sum of the average value Rav and the variance sigma as a maximum resistance value Rmax, taking the difference of the average value Rav and the variance sigma as a minimum resistance value Rmin, and taking the interval of the standard resistance as [ Rmin, rmax ].
The resistor G is the resistance of the embryo section between the upper contact rod and the lower contact rod of the rodlike embryo body.
The detection circuit comprises a power supply, a resistor R1, a switch K1, a voltmeter V1 and a resistor G access end, wherein the power supply, the resistor R1, the switch K1 and the resistor G access end are connected in series, and the voltmeter V1 is connected in parallel with the resistor R1. And two ends of the access end of the resistor G are used for respectively connecting the upper contact rod and the lower contact rod. When the compactness of the rod-shaped blank is measured, the switch K1 is closed, and the voltmeter V1 measures the voltage V at the two ends of the resistor R1 1 The resistance G of the rod-shaped blank can be calculated to obtain the value of the resistance G = (220-V) 1 )R1/V 1 。
Preferably, the movable sleeve is movably sleeved on the opening pestle, the fixing plate is fixedly sleeved on the opening pestle, and the fixing plate is connected with the movable sleeve through the elastic part. One side of the movable sleeve, which is close to the knife edge, is provided with an outer contact block, the outer contact block is provided with two outer contact points which are distributed up and down, and the knife edge is provided with inner contact points at two end parts of the knife edge.
Preferably, the detection circuit further comprises a resistor R2, a switch K2, a voltmeter V2, a knife edge micro-resistor W access end and a sheath micro-resistor M access end. The resistance R1 and the resistance G access end are connected in series to form a first series circuit, the resistance R2 and the knife edge micro-resistance W access end are connected in series to form a second series circuit, the sheath micro-resistance M access end and the switch K2 are connected in series to form a third series circuit, the power supply and the switch K1 form a main circuit, the first series circuit and the second series circuit are connected in parallel to form the main circuit, the voltmeter V2 is connected in parallel to the resistance R2, and the third series circuit is connected in parallel to the knife edge micro-resistance W access end.
The knife edge micro-resistor W access end is connected with two inner contact points of the knife edge, and the sheath micro-resistor M access end is connected with two outer contact points of the outer contact block.
When the knife edge is contacted with the surface of the rodlike embryo body, two inner contacts on the knife edge are contacted with the surface of the rodlike embryo body, the embryo end between the two inner contacts of the rodlike embryo body forms a knife edge micro resistor W which is connected into the detection circuit, and at the moment, the series circuit II is conducted. When the voltmeter V2 has a measurable voltage, the knife edge of the knife edge is in contact with the rod-shaped blank body, the sheathing layer is completely broken, the working distance of the breaking cylinder is controlled, the sheathing layer is kept broken, and the rod-shaped blank body can be prevented from being damaged.
At the moment, under the pressure of the elastic piece, the outer contact block is also contacted with the surface of the rod-shaped blank body, two outer contacts on the outer contact block are contacted with the metal layer, a sheath micro-resistor M is formed at the blank end between the outer contacts of the rod-shaped blank body and is connected into the detection circuit, the switch K2 is closed, and at the moment, the series circuit III is conducted. The sheath micro-resistor M and the blade micro-resistor W both generate equidirectional current, the sheath micro-resistor M and the blade micro-resistor W generate magnetic fields with the same magnetic direction, the like magnetic fields repel each other, and repulsion force is generated between the sheath micro-resistor M and the blade micro-resistor W to promote separation between a sheath layer and an embryo body.
The invention has the beneficial effects that: the alloy powder pressing bar processing system is used for realizing extrusion molding of alloy powder to obtain a bar-shaped blank, performing resistance detection on the formed bar-shaped blank, measuring the density of the bar-shaped blank, and screening blank sections with qualified density; through the structural cooperation of the measuring circuit and the broken pestle, the separation between the rod-shaped embryo body and the sheath is realized, the structure is compact, and the function is practical.
Drawings
FIG. 1 is a schematic structural view of the present alloy powder compacted bar processing system;
FIG. 2 is a schematic view of the structure of the alloy powder pressed bar processing system during the process of breaking the openings;
FIG. 3 is a schematic side view of the alloy powder compacted bar processing system during a breach;
FIG. 4 is a schematic diagram of a detection circuit of the alloy powder pressing bar processing system;
FIG. 5 is a schematic view of the auxiliary principle of the alloy powder pressing bar processing system for opening a hole;
FIG. 6 is a schematic diagram of a detection circuit (with transformer) of the alloy powder bar processing system.
In the figure: 1. a mold sleeve; 2. pressing a nozzle; 3. a gland; 4. a breaking pestle; 5. a crevasse cylinder; 6. a measuring rod; 7. an upper contact bar; 8. a lower contact bar; 9. a thermal insulation sleeve; 10. a flaring block; 11. metal powder; 12. an isolation layer; 13. a metal layer; 14. a coating layer; 15. a blank body; 41. a knife edge; 42. an outer contact block; 43. a movable sleeve; 44. a fixing plate; 45. an elastic member; 411. an inner contact point; 421. an outer contact point.
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.
Example 1
Referring to fig. 1, a frame of the alloy powder pressing bar processing system is provided with a die sleeve 1 for containing metal powder 11 and a sheath, a pressure nozzle 2 positioned at the lower part of the die sleeve 1, and a gland 3 positioned above the die sleeve 1. The frame still sets up the lift cylinder that is used for driving gland 3 to reciprocate, and gland 3 moves up and can leave mould cover 1 for the material loading of mould cover 1 inside, and gland 3 moves down can exert pressure to the inside metal powder 11 of mould cover 1, and metal powder 11 is extruded from pressure nozzle 2, forms the bar-shaped idiosome of target. The rod-shaped blank comprises a blank body 15 and a wrapping layer 14 wrapping the outer part of the blank body 15.
In this embodiment, the metal powder 11 is wrapped inside a jacket, the jacket includes a metal layer 13 and an isolation layer 12, the isolation layer 12 is used for isolating the metal powder 11 from the metal layer 13, so as to facilitate the stripping of the metal powder 11 from the metal layer 13, and the isolation layer 12 is an insulating material, such as glass fiber.
In this embodiment, the lower part of the pressure nozzle 2 is provided with a crevasse pestle 4 and a measuring rod 6, and the measuring rod 6 is fixedly connected with the crevasse pestle 4 and is positioned below the crevasse pestle 4.
The opening pestle 4 is rod-shaped, the axis of the opening pestle 4 is perpendicular to the axis of the die sleeve 1, one end of the opening pestle 4 is connected with the frame through the opening cylinder 5, the other end of the opening pestle 4 is provided with a knife edge 41, and the knife edge 41 is used for puncturing the sheath of the bar blank.
Further, a flaring block 10 is arranged below the broken pestle 4, and the flaring block 10 is a conical block with a narrow upper part and a wide lower part. Referring to fig. 2 and 3, when the capsule is pierced by the breach pestle 4, the upper end of the flaring block 10 is snapped into the breach, and the breach can be widened for separating the capsule from the rod-shaped embryo body.
Further, the upper end of the measuring rod 6 is provided with an upper contact rod 7, and the lower end of the measuring rod 6 is provided with a lower contact rod 8. The axes of the upper contact rod 7 and the lower contact rod 8 are respectively vertical to the axis of the die sleeve 1, and the ends of the upper contact rod 7 and the lower contact rod 8 are respectively used for being in contact with the rod-shaped blank body and measuring the resistance of the blank section between the upper contact rod 7 and the lower contact rod 8 of the rod-shaped blank body.
Further, the ends of the crevasse pestle 4, the upper contact rod 7 and the lower contact rod 8 are located on the same straight line, the straight line is parallel to the axis of the die sleeve 1, and when the knife edge of the crevasse pestle 4 is in contact with the rod-shaped blank, the ends of the upper contact rod 7 and the lower contact rod 8 are also in contact with the rod-shaped blank.
Furthermore, a heat insulation sleeve 9 is arranged outside the measuring rod 6, and the heat insulation sleeve 9 is used for forming a constant temperature field and keeping the temperature of the embryo section between the upper contact rod 7 and the lower contact rod 8 the same.
Further, the lower end of the flaring block 10 is located outside the heat-insulating sleeve 9, so that the rod-shaped blank is located inside the heat-insulating sleeve 9, and the sheath is located outside the heat-insulating sleeve 9.
Further, the alloy powder pressing bar processing system further comprises a measuring method of the density of the blank, and the measuring method comprises the following steps: measuring the resistance G of the embryo body by using a detection circuit;
when the resistance G is larger than the maximum value of the standard resistance, the compactness is insufficient; and when the resistance G is within the standard resistance range, the density is qualified.
The method for obtaining the standard resistor comprises the following steps:
step A1: sampling a plurality of embryo rods with qualified compactness, measuring the length of a measuring segment of each embryo rod to be equal to the length of the embryo rod between the upper contact rod 7 and the lower contact rod 8, measuring and recording the resistance value at the same temperature as the temperature of the heat preservation sleeve 9, and sequencing the resistance values from bottom to top to obtain r1, r2, r3,. And rn;
step A2: removing r1 and rn, obtaining an average value Rav of r2, r3, the.. And rn-1, and obtaining a variance sigma of r2, r3, the.. And rn-1;
step A3: taking the sum of the average value Rav and the variance sigma as a maximum resistance value Rmax, taking the difference of the average value Rav and the variance sigma as a minimum resistance value Rmin, and taking the interval of the standard resistance as [ Rmin, rmax ].
The resistance G is the resistance of the embryo section between the upper contact rod 7 and the lower contact rod 8 of the rod-shaped embryo body.
The detection circuit comprises a power supply, a resistor R1, a switch K1, a voltmeter V1 and a resistor G access end, wherein the power supply, the resistor R1, the switch K1 and the resistor G access end are connected in series, and the voltmeter V1 is connected in parallel to the resistor R1. And two ends of the access end of the resistor G are respectively connected with the upper contact rod 7 and the lower contact rod 8. When the density of the rodlike blank is measured, the switch K1 is closed, and the voltmeter V1 measures the voltage V at the two ends of the resistor R1 1 The resistance G of the rod-shaped blank can be calculated as G =220-V 1 R1/V 1 。
With the extrusion of gland 3, the bar-shaped embryo body is continuously extruded and extended, and the embryo section between upper contact rod 7 and lower contact rod 8 is continuously replaced. When the resistance G of a certain embryo section does not meet the density standard, a mark can be made, and the embryo section can be cut off in subsequent processing to complete screening of qualified density embryos.
The alloy powder pressing bar processing system in the embodiment can be used for extrusion molding of alloy powder to obtain a bar-shaped blank, resistance detection is carried out on the formed bar-shaped blank, the density of the bar-shaped blank is measured, blank sections with qualified density are screened, and separation between the bar-shaped blank and a sheath can be realized.
Example 2
Referring to fig. 2 and fig. 3, different from embodiment 1, the movable sleeve 43 is movably sleeved on the breaching pestle 4 in this embodiment, the fixed plate 44 is fixedly sleeved on the breaching pestle 4, and the fixed plate 44 is connected with the movable sleeve 43 through the elastic member 45. An outer contact block 42 is arranged on one side of the movable sleeve 43 close to the knife edge 41, the outer contact block 42 is provided with two outer contact points 421 distributed up and down, and the knife edge 41 is provided with inner contact points 411 at two ends of the knife edge.
Referring to fig. 4, the detection circuit of the alloy powder pressing bar processing system further includes a resistor R2, a switch K2, a voltmeter V2, a knife edge micro-resistor W access end, and a sheath micro-resistor M access end. The resistance R1 and the resistance G access end are connected in series to form a first series circuit, the resistance R2 and the knife edge micro-resistance W access end are connected in series to form a second series circuit, the sheath micro-resistance M access end and the switch K2 are connected in series to form a third series circuit, the power supply and the switch K1 form a main circuit, the first series circuit and the second series circuit are connected in parallel to form the main circuit, the voltmeter V2 is connected in parallel to the resistance R2, and the third series circuit is connected in parallel to the knife edge micro-resistance W access end.
The blade micro-resistor W is connected with two inner contact points 411 of the blade 41, and the sheath micro-resistor M is connected with two outer contact points 421 of the outer contact block 42.
When the knife edge 41 contacts with the surface of the rod-shaped blank, the two inner contact points 411 on the knife edge contact with the surface of the rod-shaped blank, the blank end between the contact points 411 in the rod-shaped blank forms a knife edge micro-resistor W to be connected to the detection circuit, and at this time, the second series circuit is conducted. When the voltmeter V2 has a measurable voltage, the knife edge 41 contacts the rod-shaped blank body, which means that the sheathing layer 14 is completely broken, and is used for controlling the working distance of the breaking cylinder 5, keeping the sheathing layer 14 broken and avoiding the rod-shaped blank body from being damaged.
At this time, under the pressure of the elastic element 45, the outer contact block 42 is also in contact with the surface of the rod-shaped blank, the two outer contact points 421 on the outer contact block 42 are in contact with the metal layer 13, the blank end between the outer contact points 421 of the rod-shaped blank forms a sheath micro resistor M to be connected to the detection circuit, the switch K2 is closed, and at this time, the series circuit three is conducted. Referring to fig. 5, the sheath micro-resistor M and the blade micro-resistor W both generate equidirectional current, the sheath micro-resistor M and the blade micro-resistor W generate magnetic fields with the same magnetic direction, the like magnetic fields repel each other, and a repulsive force is generated between the sheath micro-resistor M and the blade micro-resistor W to promote the separation between the sheath layer 14 and the embryo body 15.
It should be noted that, referring to fig. 6, the second series circuit in the present embodiment may be provided with a voltage transformation element, and the voltage transformation element is connected to the power supply circuit.
The processing process of the alloy powder pressing bar processing system in the embodiment is as follows:
the method comprises the following steps: installing a pressure nozzle 2, driving a gland 3 to move upwards by a lifting cylinder, enabling the gland 3 to leave the die sleeve 1, and putting the metal powder 11 wrapped in the sheath into the die sleeve 1 to finish feeding;
switch K1 and switch K2 are closed.
Step two: the lifting cylinder drives the gland 3 to move downwards, the gland 3 applies pressure to the metal powder 11 in the die sleeve 1, and the metal powder 11 is extruded out from the pressure nozzle 2 to form a target rod-shaped blank;
step three: when the rod-shaped blank body passes through the opening pestle 4, the opening cylinder 5 extends to push the opening pestle 4, the knife edge 41 of the opening pestle 4 punctures the sheathing layer 14, two inner contact points 411 on the knife edge of the knife edge 41 are in contact with the surface of the blank body 15, a knife edge micro-resistor W is formed at the blank end between the inner contact points 411 of the rod-shaped blank body and is connected into the detection circuit, at the moment, the series circuit II is conducted to indicate that the sheathing layer 14 is completely broken, and the opening cylinder 5 stops extending;
under the pressure of the elastic element 45, two outer contact points 421 on the outer contact block 42 are in contact with the metal layer 13 of the sheathing layer 14, a sheathing micro-resistor M is formed at the blank end between the outer contact points 421 of the blank 15 and is connected to the detection circuit, at the moment, the series circuit III is conducted, and repulsive force is generated between the sheathing micro-resistor M and the knife edge micro-resistor W to promote the separation between the sheathing layer 14 and the blank 15;
step four: the crevasse of the rod-shaped blank passes through the flaring block 10, the crevasse is widened and is used for continuously separating the sheathing layer 14 from the blank 15, the sheathing layer 14 enters the outside of the heat-insulating sleeve 9, and the blank 15 enters the inside of the heat-insulating sleeve 9;
step five: the embryo body enters between the upper contact rod 7 and the lower contact rod 8, the resistor G is connected to the measuring circuit, when the density of the embryo section between the upper contact rod 7 and the lower contact rod 8 is measured, the value of the resistor G is obtained, when the resistor G of a certain embryo section does not meet the density standard, a mark can be made, and the resistor G can be cut off in subsequent processing and used for finishing screening of qualified density embryo bodies.
The alloy powder pressing bar processing system in the embodiment is used for extrusion molding of alloy powder to obtain a rod-shaped blank, the formed rod-shaped blank is subjected to density detection, blank sections with qualified density are screened, and effective separation between the rod-shaped blank and a sheath can be realized through structural matching of a measuring circuit and a notch pestle, so that the alloy powder pressing bar processing system is compact in structure and practical in function.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The alloy powder pressing bar processing system comprises a die sleeve (1) for containing metal powder (11) and a sheath, a pressure nozzle (2) positioned at the lower part of the die sleeve (1) and a gland (3) positioned above the die sleeve (1), and is characterized in that a crevasse pestle (4) and a measuring rod (6) are arranged below the pressure nozzle (2), and the measuring rod (6) is fixedly connected with the crevasse pestle (4) and positioned below the crevasse pestle (4);
a knife edge (41) is arranged at the end part of the breaking pestle (4); the upper end of the measuring rod (6) is provided with an upper contact rod (7), and the lower end of the measuring rod (6) is provided with a lower contact rod (8); the axes of the opening pestle (4), the upper contact rod (7) and the lower contact rod (8) are respectively vertical to the axis of the die sleeve (1), and the ends of the opening pestle (4), the upper contact rod (7) and the lower contact rod (8) are positioned on the same straight line;
the lower part of the broken-opening pestle (4) is provided with a flaring block (10), the outer part of the measuring rod (6) is provided with a heat-insulating sleeve (9), and the lower end of the flaring block (10) is positioned outside the heat-insulating sleeve (9).
2. The system for processing the pressed alloy bars according to claim 1, wherein the movable sleeve (43) is movably sleeved on the opening pestle (4), the fixed plate (44) is fixedly sleeved on the opening pestle (4), and the fixed plate (44) is connected with the movable sleeve (43) through an elastic member (45);
one side of the movable sleeve (43) close to the knife edge (41) is provided with an outer contact block (42), the outer contact block (42) is provided with two outer contact points (421) which are distributed up and down, and the two end parts of the knife edge (41) are provided with inner contact points (411).
3. The alloy powder compacted bar processing system of claim 1, further comprising a method of measuring the compactness of the billet, the method comprising the steps of: measuring the resistance G of the embryo body by using a detection circuit;
when the resistance G is larger than the maximum value of the standard resistance, the compactness is insufficient; and when the resistance G is within the standard resistance range, the density is qualified.
4. The alloy powder pressed bar processing system of claim 1, wherein the detection circuit comprises a power supply, a resistor R1, a resistor R2, a switch K1, a switch K2, a voltmeter V1, a voltmeter V2, a resistor G access, a knife edge micro-resistor W access, and a sheath micro-resistor M access; the resistance R1 and the resistance G access end are connected in series to form a first series circuit, the resistance R2 and the knife edge micro-resistance W access end are connected in series to form a second series circuit, the sheath micro-resistance M access end and the switch K2 are connected in series to form a third series circuit, the power supply and the switch K1 form a main circuit, the first series circuit and the second series circuit are connected in parallel to form a main circuit, the voltmeter V1 is connected in parallel to the resistance R1, the voltmeter V2 is connected in parallel to the resistance R2, and the third series circuit is connected in parallel to the knife edge micro-resistance W access end.
5. Alloy powder compacted bar processing system according to any of claims 2-3, the knife edge micro-resistor W access being connected to two inner contact points (411) of the knife edge (41) and the sheath micro-resistor M access being connected to two outer contact points (421) of the outer contact block (42).
6. The alloy powder compacted bar processing system according to any one of claims 2 to 4, wherein the standard electrical resistance obtaining method comprises the steps of:
step A1: sampling a plurality of embryo rods with qualified compactness, measuring at corresponding temperature to obtain the resistance value of the equal-length embryo section of each embryo rod, recording, and sequencing the resistance values from bottom to top to obtain r1, r2, r3, · rn;
step A2: removing r1 and rn, obtaining an average value Rav of r2, r3, r (n-1), and obtaining a variance sigma of r2, r3, r.1;
step A3: taking the sum of the average value Rav and the variance sigma as a maximum resistance value Rmax, taking the difference of the average value Rav and the variance sigma as a minimum resistance value Rmin, and taking the interval of the standard resistance as [ Rmin, rmax ].
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| CN113976888A (en) * | 2021-12-29 | 2022-01-28 | 中国航发北京航空材料研究院 | Method for manufacturing powder alloy disk with detectable inclusions, powder alloy disk and method for verifying detectability of inclusions in powder alloy disk |
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