CN109763011A - A kind of cold pier mold high-ductility abrasion-proof cemented carbide material and preparation method thereof - Google Patents
A kind of cold pier mold high-ductility abrasion-proof cemented carbide material and preparation method thereof Download PDFInfo
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- CN109763011A CN109763011A CN201910164497.3A CN201910164497A CN109763011A CN 109763011 A CN109763011 A CN 109763011A CN 201910164497 A CN201910164497 A CN 201910164497A CN 109763011 A CN109763011 A CN 109763011A
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- cemented carbide
- proof
- carbide material
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- cold pier
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Abstract
The invention discloses a kind of cold pier mold high-ductility abrasion-proof cemented carbide materials and preparation method thereof comprising the alloy compositions of following weight percent: WC 77.2~78.2%, Co 21.8~22.2% and Cr3C20.8~1.2%, the sum of each component is 100%.A kind of cold pier mold high-ductility abrasion-proof cemented carbide material of the present invention, the adjustment of technique is designed and prepared by being reasonably formulated, make prepared cemented carbide material under the premise of some strength, good wearability and toughness can be had both, mold can be effectively prevent damaged in cold forging processes, substantially increase the service life of mold.
Description
Technical field
The present invention relates to metals not to have mold materials field, more particularly to a kind of cold pier mold high-ductility abrasion-proof hard alloy
Material and preparation method thereof.
Background technique
Cold pier mold is the indispensable mold for preparing fastener class accessory.In the forming process of fastener class accessory, cold-heading
Mold needs to bear violent punching press load, and molding surface bears very high compression, it is desirable that mold materials are with higher
Intensity, toughness and wearability.
But in general, the toughness and wearability of same alloy material are conflicting.General hardness gets over high-wearing feature
It is better, but obdurability is poorer, and obdurability is better, and hardness is poorer.
Existing cold pier mold is usually carbon tool steel or low-alloy cold-forming die steel with metal material.It is this to use
Wearability and toughness cannot be taken into account in journey, cause the service life of mold shorter.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of cold pier mold high-ductility abrasion-proof cemented carbide material and its
Preparation method is able to solve in place of existing cold pier mold above shortcomings.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of cold pier mold high-ductility is provided
Wearable hard alloy material comprising the alloy compositions of following weight percent: WC 77.2~78.2%, Co 21.8~22.2%
And Cr3C20.8~1.2%, the sum of each component is 100%.
In a preferred embodiment of the present invention, the WC includes two kinds of particle sizes that average grain diameter is 3 μm and 6 μm
Particle.
In a preferred embodiment of the present invention, the WC that the WC and average grain diameter that average grain diameter is 3 μm are 6 μm
Mass ratio be 2~2.5:1.
In order to solve the above technical problems, another technical solution used in the present invention is: it is high to provide a kind of cold pier mold
The preparation method of tough wearable hard alloy material, includes the following steps:
(1) ingredient: by WC, Co and Cr of two kinds of partial sizes3C2It is weighed by above-mentioned formula ratio, it is spare；
(2) ground and mixed: above-mentioned material is sequentially added in ball milling bucket, and a certain amount of solvent naphtha is then added, and mixed grinding obtains
The wet-milling slurry of certain partial size；
(3) drying and screening: low melt point paraffin being added into wet-milling slurry obtained in step (2), and stirring makes above-mentioned wet-milling slurry
It is dry, 400 meshes are then crossed, impurity is filtered out；
(4) compression moulding: being sieved, treated expects that grain is pressed, and obtains semi-finished product；
(5) sinter molding: pressed semi-finished product are put into sintering furnace, are sintered under inert atmosphere conditions through high-temperature pressurizing
Afterwards, cooling obtains the mold high temperature toughness cemented carbide material.
In a preferred embodiment of the present invention, in the step (2), the additional amount of the solvent naphtha is described WC, Co
And Cr3C2The 1/5~1/4 of gross mass；The process conditions of the mixed grinding are as follows: 6~8:1 of ratio of grinding media to material, Ball-milling Time be 12~
15h, the average grain diameter of gained wet-milling slurry are 2~4 μm.
In a preferred embodiment of the present invention, in the step (5), the process conditions of the sintering are as follows: in inertia argon
Gas atmosphere under the pressure condition of 10~12MPa, first rises to 800 DEG C from room temperature with the heating rate of 3~5 DEG C/min, constant temperature is kept
Then 30~60min is warming up to 1100~1200 DEG C from 800 DEG C with the heating rate of 10~15 DEG C/min, and constant temperature keeps 30~
60min is finally warming up to 1400~1450 DEG C from 1100~1200 DEG C again with the heating rate of 3~5 DEG C/min, and constant temperature keeps 30
~45min.
In a preferred embodiment of the present invention, in the step (5), the process conditions of the cooling are as follows: in inertia argon
Gas atmosphere under the pressure condition of 5~8MPa, is first cooled to 500 from 1400~1450 DEG C with the rate of temperature fall of 10~20 DEG C/min
~600 DEG C, constant temperature keeps 1~2h, then inert argon atmosphere, cooled to room temperature under condition of normal pressure.
The beneficial effects of the present invention are: a kind of cold pier mold high-ductility abrasion-proof cemented carbide material of the present invention, by reasonable
Formula design and prepare the adjustment of technique, make prepared cemented carbide material under the premise of some strength, can have both
Good wearability and toughness can effectively prevent mold damaged in cold forging processes, substantially increase the service life of mold.
Detailed description of the invention
Fig. 1 is the Scanning metalloscopy that a kind of cold pier mold high-ductility abrasion-proof cemented carbide material of the present invention amplifies 1500 times
Figure.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
The embodiment of the present invention includes:
Present invention discloses a kind of cold pier mold high-ductility abrasion-proof cemented carbide materials and preparation method thereof, wherein the cold pier
Mold high-ductility abrasion-proof cemented carbide material includes the alloy compositions of following weight percent: WC 77.2~78.2%, Co 21.8
~22.2% and Cr3C20.8~1.2%, the sum of each component is 100%.
Wherein, the WC includes the particle for two kinds of particle sizes that average grain diameter is 3 μm and 6 μm, and
The mass ratio for the WC particle that the WC particle and average grain diameter that average grain diameter is 3 μm are 6 μm is 2~2.5:1.
A kind of above-mentioned cold pier mold preparation method of high-ductility abrasion-proof cemented carbide material, specifically comprises the following steps:
(1) ingredient: by the WC particle, Co and Cr of two kinds of partial sizes3C2It is weighed by above-mentioned formula ratio, it is spare；
(2) ground and mixed: above-mentioned material is sequentially added in ball milling bucket, is then added and is accounted for described WC, Co and Cr3C2Gross mass
1/5~1/4 solvent naphtha, 12~15h of mixed grinding under conditions of 6~8:1 of ratio of grinding media to material, obtaining average grain diameter is 2~4 μm
Wet-milling slurry；
(3) drying and screening: appropriate low melt point paraffin being added into wet-milling slurry obtained in step (2), and stirring makes above-mentioned wet-milling
Slurry is dry, crosses 400 meshes, then to filter out impurity；
(4) compression moulding: by sieving, treated that mixture grain is pressed by above-mentioned, obtains semi-finished product；
(5) sinter molding: pressed semi-finished product in step (4) are put into sintering furnace, under inert atmosphere conditions, through high temperature
After pressure sintering, cooling obtains the mold high temperature toughness cemented carbide material.
Specifically, the process conditions of the sintering are as follows: under inert argon atmosphere, the pressure condition of 10~12MPa, first with
The heating rate of 3~5 DEG C/min is increased to 800 DEG C from room temperature, and constant temperature keeps 30~60min, then with 10~15 DEG C/min's
Heating rate is warming up to 1100~1200 DEG C from 800 DEG C, and constant temperature keeps 30~60min, finally again with the heating of 3~5 DEG C/min
Speed is warming up to 1400~1450 DEG C from 1100~1200 DEG C, and constant temperature keeps 30~45min.
In the step (5), the process conditions of the cooling are as follows: in the item of inert argon atmosphere and 5~8MPa pressure
Under part, 500~600 DEG C are first cooled to from 1400~1450 DEG C with the rate of temperature fall of 10~20 DEG C/min, constant temperature keeps 1~2h,
Then under conditions of inert argon atmosphere and normal pressure, cooled to room temperature.
The mold high-ductility abrasion-proof cemented carbide material of above method preparation, after tested, physical property is as follows: hardness is
84~90HRD；Tensile strength is 2800~3000N/mm2；Density is 13~15g/cm3, break surface is ductile rupture.
Embodiment 1
By taking the cold pier mold high-ductility abrasion-proof cemented carbide material for configuring 100kg as an example.
The WC particle 50kg that average grain diameter is 3 μm and the WC particle 27.8kg that average grain diameter is 6 μm are weighed, then weighs Co
Powder 21.8kg, Cr3C20.8kg, Ni 7.4kg, sequentially add in ball milling bucket, add 30kg solvent naphtha, and mixed grinding 12h is obtained
Then appropriate low melt point paraffin is added in the wet-milling slurry for being 2~4 μm to average grain diameter, stir drying, then will be mixed after drying
It closes material and crosses 400 meshes, to filter out impurity therein, the semi-finished product of required shape are finally pressed into as required, using high temperature
Pressure sintering molding, obtains the mold high-ductility abrasion-proof cemented carbide material after cooling.
Specifically, the process conditions of the sintering are as follows: under inert argon atmosphere, the pressure condition of 10~12MPa, first with
The heating rate of 5 DEG C/min rises to 800 DEG C from room temperature, and constant temperature keeps 60min, then with the heating rate of 15 DEG C/min from 800
1100~1200 DEG C DEG C are warming up to, constant temperature keeps 30min, finally rises again with the heating rate of 5 DEG C/min from 1100~1200 DEG C
For temperature to 1400~1450 DEG C, constant temperature keeps 45min.
The process conditions of the cooling are as follows: under inert argon atmosphere, the pressure condition of 5~8MPa, first with 20 DEG C/min
Rate of temperature fall be cooled to 500~600 DEG C from 1400~1450 DEG C, constant temperature keeps 2h, then inert argon atmosphere, condition of normal pressure
Lower cooled to room temperature.
The high-ductility abrasion-proof cemented carbide material of mold made from the above method, after tested, hardness are 84 ± 0.5HRD；It draws
Stretching intensity is 2860N/mm2；Density is 13.3 ± 0.1g/cm3, break surface is ductile rupture.
A kind of mold high-ductility abrasion-proof cemented carbide material of the present invention, uses the WC of coarse grain diameter for primary raw material, due to thick
The WC of partial size has high tenacity and the characteristics such as wear-resisting, and freedom from cracking ability is strong, and mold prepared therefrom has both toughness and wearability,
It is damaged during cold-heading that mold can be effectively prevented, to substantially increase the service life of mold.Above method preparation
The cold pier mold is as shown in Figure 1 with the metallographic microscope figure that high-ductility abrasion-proof cemented carbide material amplifies 1500 times.
A kind of cold pier mold high-ductility abrasion-proof cemented carbide material and preparation method thereof of the present invention, is set by being reasonably formulated
The adjustment of meter and preparation process, the especially design of the selection of amounts of components and sintering forming process close prepared hard
Golden material can have both good wearability and toughness under the premise of some strength, and mold can be effectively prevent in cold forging mistake
It is damaged in journey, the service life of mold is substantially increased, to improve the quality of cold forging part.
In the description of the present invention, it should be noted that the instruction such as term " on ", "lower", "left", "right", "inner", "outside"
Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when usually put
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, and comes for those skilled in the art
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any modification, equivalent
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of cold pier mold high-ductility abrasion-proof cemented carbide material, which is characterized in that it includes the conjunction of following weight percent
Golden component: WC 77.2~78.2%, Co 21.8~22.2% and Cr3C20.8~1.2%, the sum of each component is 100%.
2. cold pier mold high-ductility abrasion-proof cemented carbide material according to claim 1, which is characterized in that the WC includes
The particle for two kinds of particle sizes that average grain diameter is 3 μm and 6 μm.
3. cold pier mold high-ductility abrasion-proof cemented carbide material according to claim 2, which is characterized in that average grain diameter is
The mass ratio for the WC that 3 μm of the WC and average grain diameter is 6 μm is 2~2.5:1.
4. a kind of preparation method of cold pier mold high-ductility abrasion-proof cemented carbide material as described in any one of claims 1-3,
It is characterized by comprising the following steps:
(1) ingredient: by WC, Co and Cr of two kinds of partial sizes3C2It is weighed by above-mentioned formula ratio, it is spare；
(2) ground and mixed: above-mentioned material is sequentially added in ball milling bucket, and a certain amount of solvent naphtha is then added, and mixed grinding obtains
The wet-milling slurry of certain partial size；
(3) drying and screening: low melt point paraffin being added into wet-milling slurry obtained in step (2), and stirring makes above-mentioned wet-milling slurry
It is dry, 400 meshes are then crossed, impurity is filtered out；
(4) compression moulding: being sieved, treated expects that grain is pressed, and obtains semi-finished product；
(5) sinter molding: pressed semi-finished product are put into sintering furnace, are sintered under inert atmosphere conditions through high-temperature pressurizing
Afterwards, cooling obtains the mold high temperature toughness cemented carbide material.
5. the preparation method of cold pier mold high-ductility abrasion-proof cemented carbide material according to claim 4, which is characterized in that
In the step (2), the additional amount of the solvent naphtha is described WC, Co and Cr3C2The 1/5~1/4 of gross mass；The mixing is ground
The process conditions of mill are as follows: 6~8:1 of ratio of grinding media to material, Ball-milling Time are 12~15h, and the average grain diameter of gained wet-milling slurry is 2~4 μm.
6. the preparation method of cold pier mold high-ductility abrasion-proof cemented carbide material according to claim 4, which is characterized in that
In the step (5), the process conditions of the sintering are as follows: under inert argon atmosphere, the pressure condition of 10~12MPa, first with 3
The heating rate of~5 DEG C/min rises to 800 DEG C from room temperature, and constant temperature keeps 30~60min, then with the heating of 10~15 DEG C/min
Speed is warming up to 1100~1200 DEG C from 800 DEG C, and constant temperature keeps 30~60min, finally again with the heating rate of 3~5 DEG C/min
1400~1450 DEG C are warming up to from 1100~1200 DEG C, constant temperature keeps 30~45min.
7. the preparation method of cold pier mold high-ductility abrasion-proof cemented carbide material according to claim 4, which is characterized in that
In the step (5), the process conditions of the cooling are as follows: under inert argon atmosphere, the pressure condition of 5~8MPa, first with 10
The rate of temperature fall of~20 DEG C/min is cooled to 500~600 DEG C from 1400~1450 DEG C, and constant temperature keeps 1~2h, then inert argon
Atmosphere, cooled to room temperature under condition of normal pressure.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4874408A (en) * | 1972-01-10 | 1973-10-06 | ||
| CN102676902A (en) * | 2012-05-15 | 2012-09-19 | 赣州海盛钨钼集团有限公司 | Ultra-thick hard alloy, and preparation method and application thereof |
| CN104388796A (en) * | 2014-11-13 | 2015-03-04 | 株洲硬质合金集团有限公司 | Hard alloy for cold heading mold and preparation method thereof |
-
2019
- 2019-03-05 CN CN201910164497.3A patent/CN109763011A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4874408A (en) * | 1972-01-10 | 1973-10-06 | ||
| CN102676902A (en) * | 2012-05-15 | 2012-09-19 | 赣州海盛钨钼集团有限公司 | Ultra-thick hard alloy, and preparation method and application thereof |
| CN104388796A (en) * | 2014-11-13 | 2015-03-04 | 株洲硬质合金集团有限公司 | Hard alloy for cold heading mold and preparation method thereof |
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Application publication date: 20190517 |