CN110629138A - Thermal mechanical treatment process based on ultrahigh-strength and high-toughness aluminum alloy plate - Google Patents
Thermal mechanical treatment process based on ultrahigh-strength and high-toughness aluminum alloy plate Download PDFInfo
- Publication number
- CN110629138A CN110629138A CN201910977577.0A CN201910977577A CN110629138A CN 110629138 A CN110629138 A CN 110629138A CN 201910977577 A CN201910977577 A CN 201910977577A CN 110629138 A CN110629138 A CN 110629138A
- Authority
- CN
- China
- Prior art keywords
- forging
- parts
- aluminum alloy
- strength
- hoop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/50—Other details
-
- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- 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
- C22F1/053—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 of alloys with zinc as the next major constituent
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
Abstract
The invention discloses a thermal mechanical treatment process based on an ultrahigh-strength and high-toughness aluminum alloy plate, which belongs to the technical field of aluminum alloy processing and comprises the following process steps: step 1: the alloy comprises the following components in parts by weight: 0.05-0.12 part of Fe: 0.08-0.15 parts of Cu: 2.0-2.6 parts, Mn: 0.01-0.1 parts of Mg: 1.9-2.6 parts, Gr: 0.01-0.04 parts, Zn: 5.7-6.7 parts of Ti: 0.04-0.06 parts of Zr: 0.1 to 0.14. According to the invention, a forging forming process of two-step rough forging and one-step fine forging is formed by using a die system for accurately regulating and controlling the structure of a specific position region, so that a large amount of fine subgrain structures are formed in the root region of the lower support of the combined body of the rotating arm and the rotating arm hoop, the plastic deformation capability of the alloy is favorably improved, and the strength and the fatigue resistance of the high-stress region are favorably improved.
Description
Technical Field
The invention relates to a mechanical treatment process, in particular to a thermal treatment process based on an ultrahigh-strength and high-toughness aluminum alloy plate, and belongs to the technical field of aluminum alloy processing.
Background
The light high-strength material and the advanced manufacturing technology have great potential in the aspects of light weight design and manufacturing of the bogie. High-performance aluminum alloy materials are generally adopted to manufacture transmission gear boxes, air spring brackets, bogie sleeper beams, axle box bodies, motor end covers and the like of high-speed motor trains such as Japan new mainline, Germany ICE, French TGV and the like, so that the self weight of the bogie is obviously reduced, and the light-weight structural design and material application development strength of the bogie are enhanced.
In China, a large amount of high-strength cast aluminum alloy is adopted on high-speed trains to manufacture motor covers, motor fans, transmission gear boxes and the like, but the high-speed train is mainly concentrated on the upper body part of the high-speed train, and the weight of the high-speed train is more than 2-15 kg; the size is mainly 200-600mm, and the requirements on high toughness and corrosion resistance of the material are low.
Disclosure of Invention
The invention mainly aims to solve the defects of the prior art and provide a thermomechanical treatment process based on an ultrahigh-strength high-toughness aluminum alloy plate.
The purpose of the invention can be achieved by adopting the following technical scheme:
a thermal mechanical treatment process based on an ultrahigh-strength high-toughness aluminum alloy plate comprises the following process steps:
step 1: the aluminum alloy plate comprises the following components in parts by weight: 0.05-0.12 part of Fe: 0.08-0.15 parts of Cu: 2.0-2.6 parts, Mn: 0.01-0.1 parts of Mg: 1.9-2.6 parts, Gr: 0.01-0.04 parts, Zn: 5.7-6.7 parts of Ti: 0.04-0.06 parts of Zr: 0.1-0.14, and the balance of aluminum;
step 2: performing high-quality casting on large-size ingot blanks, heating and casting the raw materials at 680-800 ℃, pouring the heated solid liquid into a mold for casting, and sealing the mold after 3min of rare gas is introduced into a rotating arm hoop mold in the casting process;
and step 3: forging the cast plate, and performing warm forging on the cast plate by applying constant knocking force to the cast at 230-460 ℃;
and 4, step 4: carrying out nondestructive flaw detection on the forging by adopting laser speckle imaging detection and ultrasonic detection;
and 5: carrying out heat treatment on the forge piece in the step 4, rapidly raising the temperature to 300-420 ℃, keeping the temperature for 30-80 min, carrying out T74 double-stage aging process treatment, and then air cooling or lime cooling;
step 6: carrying out numerical control machining on the forged piece cooled in the step 5, and removing redundant burrs;
and 7: carrying out surface treatment on the forging;
and 8: and detecting the generated workpiece.
Preferably, in step 3, the forging process employs: two-step rough forging and one-step fine forging.
Preferably, in step 3, the forging process is a forging process of forging the casting by using a hammer in a forging machine.
Preferably, the forging is controlled by the orientation of the forging structure and the forging region is the root region of the lower body of the swivel arm hoop body.
Preferably, in step 4, magnetic powder inspection is adopted for nondestructive inspection, the detected information is to detect whether defects or non-uniformity exist in the forged piece, and simultaneously detect the size, position, property and quantity of the defects, when the workpiece is magnetized, if the defects exist on the surface or near surface of the workpiece, magnetic flux leakage is generated due to the increase of magnetic resistance at the defects to form a local magnetic field, and the magnetic powder displays the shape and position of the defects at the positions, so that the existence of the defects is judged.
Preferably, in step 5, the heat treatment ensures that the forging is optimized for intragranular or grain boundary precipitation.
Preferably, in step 7, the surface treatment of the workpiece is performed by sand blasting and shot blasting.
Preferably, a specific location area tissue accurate regulating and controlling system is arranged inside the rotating arm hoop mold and is communicated with a computer, and the regulating and controlling system is used for monitoring the exhaust in the mold and the flatness of the casting and transmitting information to the computer.
Preferably, the thermomechanical processing process produces a boom cuff comprising: rocking arm and fixed hoop, the mounting hole that is used for installing on the train is offered to the one end of rocking arm, and the recess is seted up to the inside of rocking arm, and the top of recess is equipped with first rocking arm hoop, and the inside of fixed hoop is equipped with and is used for fixed rocking arm and the second rocking arm hoop of mutually supporting with first rocking arm hoop.
The invention has the beneficial technical effects that: according to the thermal mechanical treatment process based on the ultrahigh-strength high-toughness aluminum alloy plate, a forging forming process of two-step rough forging and one-step fine forging is formed by using a die system with a specific site region structure accurately regulated, a large amount of fine subgrain structures are formed in the root region of the lower support of the combined body of the rotating arm and the rotating arm hoop, the plastic deformation capacity of the alloy is favorably improved, and the strength and the fatigue resistance of the high-stress region are favorably improved.
Drawings
FIG. 1 is a schematic view of a rotating arm structure of a preferred embodiment of the thermal mechanical treatment process based on the ultra-high strength and high toughness aluminum alloy plate according to the invention;
FIG. 2 is a schematic structural view of a rotating arm hoop in a preferred embodiment of the thermal mechanical treatment process based on the ultra-high strength and high toughness aluminum alloy plate according to the invention;
FIG. 3 is a schematic structural diagram of a forging die of a preferred embodiment of the thermal mechanical treatment process based on the ultra-high strength and high toughness aluminum alloy plate according to the invention;
FIG. 4 is a schematic structural view of a blank mold according to a preferred embodiment of the thermal mechanical treatment process of the ultra-high strength and high toughness aluminum alloy plate;
fig. 5 is a schematic structural view of a trimming die of a preferred embodiment of the thermal mechanical treatment process based on the ultra-high strength and high toughness aluminum alloy plate according to the invention.
In the figure: 1-mounting hole, 2-first rotating arm hoop, 3-rotating arm, 4-fixed hoop and 5-second rotating arm hoop.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
The first embodiment is as follows:
as shown in fig. 1-fig. 2, the thermal mechanical treatment process based on the ultra-high strength and high toughness aluminum alloy plate provided in this embodiment includes the following steps:
step 1: the aluminum alloy plate comprises the following components in parts by weight: 0.05-0.12 part of Fe: 0.08-0.15 parts of Cu: 2.0-2.6 parts, Mn: 0.01-0.1 parts of Mg: 1.9-2.6 parts, Gr: 0.01-0.04 parts, Zn: 5.7-6.7 parts of Ti: 0.04-0.06 parts of Zr: 0.1-0.14, and the balance of aluminum;
step 2: performing high-quality casting on large-size ingot blanks, heating and casting the raw materials at 680-800 ℃, pouring the heated solid liquid into a mold for casting, and sealing the mold after 3min of rare gas is introduced into a rotating arm hoop mold in the casting process;
and step 3: forging the cast plate, and performing warm forging on the cast plate by applying constant knocking force to the cast at 230-460 ℃;
and 4, step 4: carrying out nondestructive flaw detection on the forging by adopting laser speckle imaging detection and ultrasonic detection;
and 5: carrying out heat treatment on the forge piece in the step 4, rapidly raising the temperature to 300-420 ℃, keeping the temperature for 30-80 min, carrying out T74 double-stage aging process treatment, and then air cooling or lime cooling;
step 6: carrying out numerical control machining on the forged piece cooled in the step 5, and removing redundant burrs;
and 7: carrying out surface treatment on the forging;
and 8: and detecting the generated workpiece.
In this example, as shown in fig. 1, in step 3, the forging process employs: in step 3, forging is carried out on the casting by adopting a forging hammer in forging machinery, forging is carried out on the forging by directionally controlling forging tissues and the forging area is the root area of a lower support body of a rotating arm hoop body, in step 4, magnetic powder inspection is adopted for nondestructive inspection, detected information is that whether defects or non-uniformity exist in the forging is detected, the size, the position, the property and the quantity of the defects are detected, when the workpiece is magnetized, if defects exist on the surface or the near surface of the workpiece, magnetic flux leakage is generated due to the increase of magnetic resistance at the defects to form a local magnetic field, the shape and the position of the defects are displayed on the magnetic powder, so that the existence of the defects is judged, in step 5, the forge piece is subjected to heat treatment to ensure the optimization of intragranular or grain boundary precipitation, in step 7, the surface treatment of the workpiece adopts sand blasting and shot blasting, and a specific position area tissue precise regulation and control system is arranged in the rotating arm hoop mold, the regulating system is communicated with a computer and is used for monitoring the flatness of exhaust and castings in the die and transmitting information to the computer, a forging forming process of two-step rough forging and one-step fine forging is formed by using the die system with the structure accurately regulated and controlled in a specific position area, so that a large amount of fine subgrain structures are formed in the root area of the lower support of the rotating arm and the rotating arm hoop, the plastic deformation capability of the alloy is improved, the strength and the fatigue resistance of the high stress area are improved, the T74 two-stage aging process is adopted for processing, the yield strength of the T74-state forge piece is measured to be more than 480MPa, the tensile strength reaches 530MPa, the elongation is 8 percent, and the determined mechanical property manufacturing target is obviously superior, the performance index requirements of bogie parts such as a rotating arm, a rotating arm hoop, a sliding bush and the like can be met, and the reliable service of the high-strength aluminum alloy forging parts under the running condition of the bogie can be ensured.
The utility model provides a rocking arm hoop based on super high strength and high toughness aluminum alloy plate's thermomechanical treatment technology is made, includes rocking arm 3 and fixed hoop 4, and the mounting hole 1 that is used for installing on the train is seted up to the one end of rocking arm 3, and the inside of rocking arm 3 is seted up flutedly, and the top of recess is equipped with first rocking arm hoop 2, and the inside of 4 is equipped with and is used for fixed rocking arm 3 and with the second rocking arm hoop 5 of first rocking arm hoop 2 mutually supporting.
In summary, in the present embodiment, according to the thermal mechanical treatment process based on the ultra-high strength and high toughness aluminum alloy plate of the present embodiment, a forging forming process of two-step rough forging and one-step fine forging is formed by using a die system with a specific location area structure precisely regulated and controlled, so as to promote the root region of the lower support of the combined body of the rotating arm and the rotating arm hoop to form a large amount of fine subgrain structures, which is not only beneficial to improving the plastic deformation capability of the alloy, but also beneficial to improving the strength and fatigue resistance of the high stress area, the T74 two-stage aging process is adopted, and the yield strength of the T74-state forging reaches above 480MPa, the tensile strength reaches 530MPa, the elongation is 8%, which is significantly better than the determined mechanical property manufacturing target, can meet the performance index requirements of the rotating arm, the rotating arm hoop, the sliding bush and other bogie components, and can ensure the reliable service of these high strength aluminum alloy forging components, the forge piece is subjected to sand blasting and shot blasting surface treatment, an oxide layer on the surface of the forge piece can be removed, the surface of the forge piece is cleaned at the same time, a die system with a specific position region organization accurate regulation is added into a rotating arm hoop die, so that a rotating arm, a rotating arm hoop, a sliding bush and other bogie parts can be conveniently manufactured through regulation and control of a specific position, and the forge piece is treated by adopting a T74 double-stage aging process to improve the plastic deformation capacity of the alloy.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.
Claims (9)
1. A thermal mechanical treatment process based on an ultrahigh-strength high-toughness aluminum alloy plate is characterized by comprising the following process steps:
step 1: the aluminum alloy plate comprises the following components in parts by weight: 0.05-0.12 part of Fe: 0.08-0.15 parts of Cu: 2.0-2.6 parts, Mn: 0.01-0.1 parts of Mg: 1.9-2.6 parts, Gr: 0.01-0.04 parts, Zn: 5.7-6.7 parts of Ti: 0.04-0.06 parts of Zr: 0.1-0.14, and the balance of aluminum;
step 2: performing high-quality casting on large-size ingot blanks, heating and casting the raw materials at 680-800 ℃, pouring the heated solid liquid into a mold for casting, and sealing the mold after 3min of rare gas is introduced into a rotating arm hoop mold in the casting process;
and step 3: forging the cast plate, and performing warm forging on the cast plate by applying constant knocking force to the cast at 230-460 ℃;
and 4, step 4: carrying out nondestructive flaw detection on the forging by adopting laser speckle imaging detection and ultrasonic detection;
and 5: carrying out heat treatment on the forge piece in the step 4, rapidly raising the temperature to 300-420 ℃, keeping the temperature for 30-80 min, carrying out T74 double-stage aging process treatment, and then air cooling or lime cooling;
step 6: carrying out numerical control machining on the forged piece cooled in the step 5, and removing redundant burrs;
and 7: carrying out surface treatment on the forging;
and 8: and detecting the generated workpiece.
2. The process for the thermomechanical treatment of the ultrahigh-strength and high-toughness aluminum alloy plate based on the claim 1, wherein in the step 3, the forging process comprises the following steps: two-step rough forging and one-step fine forging.
3. The process for the thermomechanical treatment of the aluminum alloy plate with ultrahigh strength and toughness as set forth in claim 1, wherein in the step 3, the forging process is a forging process of forging the casting by using a hammer of a forging machine.
4. The process of claim 3, wherein the forging is oriented control of forging structure and the forging area is the root area of the lower support of the swivel arm hoop body.
5. The process of claim 1, wherein in step 4, magnetic powder inspection is used for nondestructive inspection, the inspection information is to detect whether defects or non-uniformity exist in the forged part, and the size, position, property and quantity of the defects are detected, when the workpiece is magnetized, if defects exist on the surface or near surface of the workpiece, magnetic flux leakage is generated due to increased magnetic resistance at the defects, a local magnetic field is formed, and the magnetic powder displays the shape and position of the defects at the positions, so that the existence of the defects is judged.
6. The thermomechanical treatment process based on the ultrahigh-strength and high-toughness aluminum alloy plate, according to claim 1, wherein in the step 5, the heat treatment ensures that the forging is optimized in intra-grain or grain boundary precipitation.
7. The process for the thermomechanical treatment of the ultrahigh-strength and high-toughness aluminum alloy plate according to claim 1, wherein in the step 7, the surface treatment of the workpiece is performed by sand blasting and shot blasting.
8. The process of claim 1, wherein the inside of the rotating arm hoop die is provided with a precise control system for the specific location tissue, and the control system is communicated with a computer, and the control system is used for monitoring the exhaust in the die and the flatness of the casting and transmitting information to the computer.
9. The process of claim 1, wherein the thermomechanical treatment process is used for manufacturing the swivel arm hoop comprising: rocking arm (3) and fixed hoop (4), mounting hole (1) that are used for installing on the train are offered to the one end of rocking arm (3), and the inside of rocking arm (3) is seted up flutedly, and the top of recess is equipped with first rocking arm hoop (2), and the inside of fixed hoop (4) is equipped with and is used for fixed rocking arm (3) and hoop (5) of second rocking arm of mutually supporting with first rocking arm hoop (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977577.0A CN110629138A (en) | 2019-10-15 | 2019-10-15 | Thermal mechanical treatment process based on ultrahigh-strength and high-toughness aluminum alloy plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977577.0A CN110629138A (en) | 2019-10-15 | 2019-10-15 | Thermal mechanical treatment process based on ultrahigh-strength and high-toughness aluminum alloy plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110629138A true CN110629138A (en) | 2019-12-31 |
Family
ID=68975106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910977577.0A Pending CN110629138A (en) | 2019-10-15 | 2019-10-15 | Thermal mechanical treatment process based on ultrahigh-strength and high-toughness aluminum alloy plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110629138A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111659889A (en) * | 2020-06-30 | 2020-09-15 | 同济大学 | 3D printing process method of high-strength aluminum-manganese alloy |
| CN112792503A (en) * | 2020-12-24 | 2021-05-14 | 国工恒昌新材料沧州有限公司 | Preparation method of large ring heat treatment clamp |
| CN114603975A (en) * | 2022-05-16 | 2022-06-10 | 江苏逸欣节能科技有限公司 | Automatic gluing composite device for producing heat-insulation sandwich board |
-
2019
- 2019-10-15 CN CN201910977577.0A patent/CN110629138A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111659889A (en) * | 2020-06-30 | 2020-09-15 | 同济大学 | 3D printing process method of high-strength aluminum-manganese alloy |
| CN112792503A (en) * | 2020-12-24 | 2021-05-14 | 国工恒昌新材料沧州有限公司 | Preparation method of large ring heat treatment clamp |
| CN114603975A (en) * | 2022-05-16 | 2022-06-10 | 江苏逸欣节能科技有限公司 | Automatic gluing composite device for producing heat-insulation sandwich board |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA3065982C (en) | Method for controlling deformation and precision of parts in parallel during additive manufacturing process | |
| CN110629138A (en) | Thermal mechanical treatment process based on ultrahigh-strength and high-toughness aluminum alloy plate | |
| CN103302226B (en) | Precise forging process for front upper arm part of car chassis suspension system | |
| CN101598585B (en) | Preparation method of aluminum-alloy gas meter end cover | |
| CN102962425B (en) | Preparation method of oblique oil cylinder body | |
| CN102615478B (en) | Forging process of wind power main shaft | |
| CN103831386B (en) | A kind of production method of brake disc of high-speed train and forging mold | |
| CN106319305B (en) | 6061 material commercial car aluminium alloy spindle nose liquid forging process methods | |
| CN112342366A (en) | Ultrasonic impact and deposition forming integrated device and technology for improving structure and performance of additive manufacturing metal component | |
| CN103447432B (en) | A kind of isothermal forging process of large scale magnesium alloy parts | |
| CN104511726B (en) | Five cylinder pressure break pump crankcase manufacture method of Whole fiber Integral die-forged | |
| CN101811246A (en) | Production method of wind tower flange deformed ring forging | |
| CN107414057B (en) | The manufacturing method of whole composite casting high-speed railway track switch slider bed platen | |
| JPH02255268A (en) | Production of disk made of super heat resisting alloy | |
| CN103121081B (en) | Method for integrally casting heavy-duty high-horsepower diesel locomotive bogie | |
| CN104325838A (en) | High-speed rail wheel and hot-extrusion integrated forming method thereof | |
| CN109048233A (en) | A kind of aluminium alloy wheel hub manufacturing method | |
| CN101367103B (en) | Magnesium alloy sheet material flow forming and molding process | |
| CN107739877A (en) | One Albatra metal roller set and preparation method thereof | |
| CN106636798B (en) | 6061 material commercial car aluminium alloy wheel hub liquid forging process methods | |
| CN103753150B (en) | A kind of preparation method of magnesium alloy honeycomb blind hole structural member | |
| CN205393435U (en) | Modular forging instrument | |
| CN110052595B (en) | Automobile steering knuckle with anti-transgranular fracture failure mode and manufacturing method thereof | |
| CN104985159B (en) | A kind of die casting equipment and method for producing refractory metal coating ceramic chip material | |
| CN203917851U (en) | A kind of vertical centrifugal casting device for the manufacture of roll neck |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191231 |
|
| RJ01 | Rejection of invention patent application after publication |