CN109127751A - A method of coarse grain ring is reduced for hard alloy - Google Patents
A method of coarse grain ring is reduced for hard alloy Download PDFInfo
- Publication number
- CN109127751A CN109127751A CN201710461954.6A CN201710461954A CN109127751A CN 109127751 A CN109127751 A CN 109127751A CN 201710461954 A CN201710461954 A CN 201710461954A CN 109127751 A CN109127751 A CN 109127751A
- Authority
- CN
- China
- Prior art keywords
- coarse grain
- hard alloy
- grain ring
- blank
- reduced
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/02—Cooling or heating of containers for metal to be extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
-
- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
Abstract
A method of coarse grain ring is reduced for hard alloy.It is related to hard alloy processing technology field.Propose that a kind of orderliness is clear, orderly and the method for reducing coarse grain ring for hard alloy of contained coarse grain ring after hard alloy extrusion forming can be greatly reduced in step.The present invention first carries out homogenization to raw material in process, so that blank internal grain is evenly distributed, particle is further refined；The initial temperature for resetting extrusion cylinder, is larger than the temperature of blank, so that deflection be made to reduce, reduces coarse grain ring depth；And using at the uniform velocity squeezing, so that the deformation of extruded product is more uniform, surface is more smooth；Finally, making initial temperature when quenching relatively low, the generation of coarse grain ring is further reduced.The advantages of having that orderliness is clear, step is orderly on the whole, and coarse grain ring contained after hard alloy extrusion forming can be greatly reduced.
Description
Technical field
The present invention relates to hard alloy processing technology fields.
Background technique
Nowadays client does not require nothing more than product items chemical component, tensile strength, hardness etc. and touches the mark, it is necessary to guarantee to produce
Product surface is smooth, cannot there is granular metal precipitation.For current common hot extrusion industry, the section and length of product are not
Uniformly.The crystal grain of the usually coarse grains at center and head, outer layer and tail portion is tiny.Therefore thick according to production bar and profile
Degree, general front end needs to cut certain waste material.
Specifically: the inhomogeneities that one side, extruded product occur on section and length is mainly due to uneven
Caused by deformation；Aluminium bar enters that extrusion cylinder is gradually upset to become larger, and is limited in extrusion process by frictional force and mold shape, according to
Metal flow direction, aluminium bar central part aluminium is introduced into die cavity in extrusion cylinder, and outer layer also progresses into die cavity, and outer layer metal is born
Very aximal deformation value, so there is structural heterogenity on product section.
Equally, in length, since frictional resistance and mold shape constrain, metal flow inhomogeneities is gradually increased.Institute
It bears deflection also to gradually increase, so that the crystal grain degree of wrecking be made to be also to be gradually increased from front to back, leads to product length
On nonuniform organization.
On the other hand, when extrusion speed is too fast or stick temperature is excessively high, stock skin-friction force increases, temperature in aluminium bar extruding
It is significantly raised, it is also possible to which that for fracture than front end coarse grains, product surface has granular particulate matter of obviously cracking rice after in product.
Summary of the invention
The present invention in view of the above problems, propose a kind of orderliness is clear, step orderly and can be greatly reduced hard alloy squeeze
The method for reducing coarse grain ring for hard alloy of contained coarse grain ring after molded.
The technical solution of the present invention is as follows: being operated according to the following steps:
1), homogenization: blank is taken, and all raw material is subjected to homogenization；
2) it, heats: blank is heated；
3) it, sets the temperature of extrusion cylinder: setting the initial temperature of extrusion cylinder, be larger than the temperature of blank；
4), extrusion forming: blank is sent into extrusion cylinder, is squeezed, molding, is formed alloy components；
5) it, is heat-treated: alloy components is quenched；It finishes.
Using at the uniform velocity squeezing in step 4), operating current when extruding is 0.3A-0.4A.
Can be first by alloy components natural cooling 5-20min in step 5), then be quenched.
The present invention first carries out homogenization to raw material in process, so that the distribution of blank internal grain is equal
Even, particle further refines；The initial temperature for resetting extrusion cylinder, is larger than the temperature of blank, so that deflection is reduced,
Reduce coarse grain ring depth；And using at the uniform velocity squeezing, so that the deformation of extruded product is more uniform, surface is more smooth；Finally, making
Initial temperature when must quench is relatively low, further reduces the generation of coarse grain ring.The clear, step with orderliness on the whole
Orderly, the advantages of and coarse grain ring contained after hard alloy extrusion forming being greatly reduced.
Specific embodiment
The present invention operates according to the following steps:
1), homogenization: blank is taken, and all raw material is subjected to homogenization；So that the distribution of blank internal grain is equal
Even, particle further refines；
2) it, heats: blank is heated；
3) it, sets the temperature of extrusion cylinder: setting the initial temperature of extrusion cylinder, be larger than the temperature of blank；In this way, can make to become
Shape amount is reduced, and reduces coarse grain ring depth；
4), extrusion forming: blank is sent into extrusion cylinder, is squeezed, molding, is formed alloy components；
5) it, is heat-treated: alloy components is quenched；It finishes.
Using at the uniform velocity squeezing in step 4), operating current when extruding is 0.3A-0.4A.So that the change of extruded product
Shape is more uniform, and surface is more smooth.
Can be first by alloy components natural cooling 5-20min in step 5), then be quenched.So that first when quenching
Beginning temperature is relatively low, further reduces the generation of coarse grain ring.
Claims (3)
1. a kind of method for reducing coarse grain ring for hard alloy, which is characterized in that operated according to the following steps:
1), homogenization: blank is taken, and all raw material is subjected to homogenization；
2) it, heats: blank is heated；
3) it, sets the temperature of extrusion cylinder: setting the initial temperature of extrusion cylinder, be larger than the temperature of blank；
4), extrusion forming: blank is sent into extrusion cylinder, is squeezed, molding, is formed alloy components；
5) it, is heat-treated: alloy components is quenched；It finishes.
2. a kind of method for reducing coarse grain ring for hard alloy according to claim 1, which is characterized in that in step 4)
Using at the uniform velocity squeezing, operating current when extruding is 0.3A-0.4A.
3. a kind of method for reducing coarse grain ring for hard alloy according to claim 1, which is characterized in that in step 5)
Can be first by alloy components natural cooling 5-20min, then be quenched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710461954.6A CN109127751A (en) | 2017-06-19 | 2017-06-19 | A method of coarse grain ring is reduced for hard alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710461954.6A CN109127751A (en) | 2017-06-19 | 2017-06-19 | A method of coarse grain ring is reduced for hard alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109127751A true CN109127751A (en) | 2019-01-04 |
Family
ID=64803943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710461954.6A Withdrawn CN109127751A (en) | 2017-06-19 | 2017-06-19 | A method of coarse grain ring is reduced for hard alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109127751A (en) |
-
2017
- 2017-06-19 CN CN201710461954.6A patent/CN109127751A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190104 |