CN1265903C - Guide wheel for high-speed rod-rolling mill and its manufacture - Google Patents
Guide wheel for high-speed rod-rolling mill and its manufacture Download PDFInfo
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- CN1265903C CN1265903C CN 02110248 CN02110248A CN1265903C CN 1265903 C CN1265903 C CN 1265903C CN 02110248 CN02110248 CN 02110248 CN 02110248 A CN02110248 A CN 02110248A CN 1265903 C CN1265903 C CN 1265903C
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- guide wheel
- silicon nitride
- mass percent
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Abstract
The present invention discloses a guide wheel for a high-speed rod rolling mill and a manufacture method thereof for guiding reinforced bars for rolling rods. The guide wheel is made of silicon nitride ceramic material. A material recipe is mainly composed of silicon nitride powder, titanium carbonitride micro powder and tetragonal zirconia micro powder are added, and magnesium oxide (MgO), yttrium oxide (Y2O3), aluminum oxide (Al2O3) and lanthanum oxide (La2O3) are added as additives. Blending is manufactured into a guide wheel blank body by a series of processes. After the guide wheel blank body is ground and processed, a groove is processed on an inner wall. An elastic clamping ring is arranged in the groove of the inner wall. The service life of the guide wheel for a high-speed rod rolling mill of the present invention is at least six times longer than that of a stainless steel guide wheel so as to greatly enhance the work efficiency of the high-speed rod rolling mill.
Description
Technical field
The present invention relates to a kind of guide wheel and manufacture method thereof that is used for high-speed rod-rolling mill.
Background technology
Wire rod is one of important kind of steel products, is widely used in building and goods industry.The wire rod annual production accounts for about 10% of world's steel total output in the world wide at present, and wherein 80% wire rod is high-speed rod-rolling mill production.High-speed wire production line the most important thing is mm finishing mill unit.Along with the development of high-speed wire rolling technology, mill speed is more and more higher, has now reached per second more than 120 meters.Each road roll pass difference in the wire rod rolling, circular hole and oval groove alternately shut out the circular steel that come by the circular hole roll and enter down in one oval groove roll rolling often; Shut out the flat steel that come by the oval groove roll and enter down in one circular hole roll rollingly again, so constantly circulation progressively has billet rolling one-tenth the wire rod of certain diameter.Wherein when flat steel enter into the circular hole roll and are rolled, flat steel must enter with certain angle, otherwise will cause accident such as heap steel etc., therefore need having a pair of rolling to lead position-be before the circular hole roll, that guide wheel comes the clamping reinforcing bar, the guiding reinforcing bar can enter in the circular hole roll it with required angle is rolling.Because mill speed is fast, reinforcing bar is quite serious to the wearing and tearing of guide wheel, to reach 4～50,000 rev/mins at mm finishing mill unit guide wheel rotating speed in addition, the guide wheel of high speed rotating will produce bigger active force to the bearing that assembles in the guide wheel, and this active force strengthens with the increase of guide wheel density of material.Existing high nickel heat-resistance stainless steel guide wheel is not because wear-resisting; service life is very short; steel transportation amount generally has only 400～500 tons; and the density of high nickel heat-resistance stainless steel guide wheel is big, and during the guide wheel high speed rotating, the active force that the bearing that assembles in the guide wheel is produced is very big; bearing very easily damages; production line will constantly be shut down the guide wheel that replacing has been worn and torn or bearing goes wrong, and production efficiency is subjected to very big influence, and has increased the incidence of heap steel accident.
Summary of the invention
The present invention aims to provide a kind of wearability height, guide wheel that density is little, to improve the service life of guide wheel, improves the operating efficiency of high-speed rod-rolling mill;
Another purpose of the present invention aims to provide a kind of method of making this guide wheel.
The technical solution adopted for the present invention to solve the technical problems is: on the basis of the guide wheel shape that does not change prior art, it is made material improves, employing is that the silicon nitride ceramic material of primary raw material is made with the alpha-silicon nitride powders, and a snap ring is equipped with in the center of guide wheel inwall.Guide wheel of the present invention adds titanium carbonitride micro mist, tetragonal zircite micro mist in the prescription of silicon nitride ceramic material, and adds magnesia (MgO), yittrium oxide (Y
2O
3), aluminium oxide (Al
2O
3) lanthana (La
2O
3) as additive.
The manufacture method of guide wheel of the present invention may further comprise the steps:
1, batching: be the ultra-fine alpha-phase silicon nitride powder of 70-90%, the super fine titanium carbonitride powder that mass percent is 0-15%, the tetragonal zircite micro mist that mass percent is 5-10%, additive (forming) weighing in proportion, the mixing that mass percent is 5-15% with mass percent earlier by ultra-fine alumina, ultrafine yttria, ultra-fine lanthana, super fine magnesia;
2, moulding: through ball milling, drying, sieve, operation such as granulation, moulding, sintering makes the guide wheel base substrate;
3, fine finishining: the guide wheel base substrate is finish grinded processing, on inwall, process groove with thin skive again, snap ring is contained in the inboard wall groove, just made the silicon nitride ceramics guide wheel.
Because silicon nitride ceramic material has high temperature resistant, high strength, high abrasion, excellent comprehensive performance such as anticorrosive, therefore the guide wheel made from silicon nitride ceramic material has advantages such as hardness height, wearability are good, thereby has prolonged the service life of guide wheel; Because silicon nitride ceramics density is little, density is 3.2～3.3g/cm again
3, and iron and steel density is 7.8g/cm
3Under equal conditions, silicon nitride ceramics guide wheel active force to bearing under high speed rotating has only 41% of heat-resistance stainless steel, so has also correspondingly prolonged the service life of guide wheel bearing, thereby has reduced the incidence of the heap steel accident that causes because of the guide wheel damage of bearings.In silicon nitride ceramics guide wheel installation test, (cause the uneven wear) except that being stuck owing to bearing, all guide wheel steel transportation amounts all surpass 3000 tons, 3650 tons of average out tos, be up to 5000 tons, and on the same frame, adopting the heat-resistance stainless steel guide wheel, steel transportation amount on average has only 450～500 tons, the highest also is no more than 1000 tons, and be more than 6 times of stainless steel guide wheel the service life of silicon nitride ceramics guide wheel.Because should there be a high step of 2.5 millimeters the center of guide wheel inwall, if make this step earlier as making the metal guide wheel, to make the postorder correct grinding processing of ceramic guide wheel become very difficult, after adopting making step of the present invention earlier the guide wheel base substrate to be finish grinded processing, on the guide wheel inwall, grind groove, the groove of again snap ring being packed into constitutes the step of guide wheel by outstanding snap ring, thereby has solved the difficult problem that ceramic guide wheel step is difficult to make.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the profile of guide wheel for high-speed rod-rolling mill of the present invention
The specific embodiment
1, batching: with ultra-fine alpha-phase silicon nitride powder (≤1 μ accounts for 90%), super fine titanium carbonitride powder, ultra-fine alumina, ultrafine yttria, ultra-fine lanthana, super fine magnesia, tetragonal zircite powder are pressed the formula rate weighing of table 1;
2, moulding: the raw material of working good is added in the nylon ball grinder, is blending agent with the pure water, makes ball-milling medium with the tetragonal zircite ball, makes binding agent by adding 1% polyvinyl alcohol in the 100 gram mixed powders in jar again.Material, water, ball mass ratio are 1: 1: 1.Behind the ball milling 24 hours, spray-drying, 120 mesh sieve sieve, granulation.Afterwards the powder after the granulation is filled in the steel die, pressurization 30Mpa is pressed into thick cylinder; Thick cylinder bag with latex film, is deflated with vavuum pump, in the isostatic pressing machine of packing into, with the last moulding of 250Mpa pressure; Base substrate behind the static pressure such as grade is put as 600 degree degreasings in the Muffle furnace; The base substrate 1800 ℃ of pressureless sinterings 2 hours of packing in the middle frequency furnace after the degreasing, protective gas is a nitrogen, sinters the guide wheel base substrate into;
3, fine finishining: will lead base substrate with two end faces of skive correct grinding processing and inside and outside wall to the required size precision, and the intersection of inside and outside circle wall and end face ground chamfering, afterwards within it on the wall center process wide 3 millimeters with skive, dark 0.5 millimeter groove, special steel snap ring 1 is contained in the inboard wall groove, process pass with the moulding skive at its outer wall again, as shown in Figure 1, just made silicon nitride ceramics guide wheel 2.
The mechanical property of table 1 different formulations silicon nitride ceramic material
| Silicon nitride wt% | 83 | 71 | 70 |
| Titanium carbonitride wt% | 0 | 5.0 | 12.0 |
| Aluminium oxide wt% | 3.0 | 3.5 | 2.0 |
| Yittrium oxide wt% | 6.0 | 5.5 | 6.0 |
| Lanthana wt% | 1.5 | 3.5 | 0 |
| Magnesia wt% | 1.5 | 1.5 | 2.0 |
| Tetragonal zircite wt% | 5.0 | 10 | 8.0 |
| Bending strength MPa | 730 | 708 | 696 |
| Fracture toughness Mpam 1/2 | 6.7 | 7.2 | 6.9 |
| Vickers hardness HRA | 88 | 90 | 91 |
Claims (2)
1, a kind of guide wheel for high-speed rod-rolling mill is characterized in that: described guide wheel is that the silicon nitride ceramic material of primary raw material is made in order to alpha-silicon nitride powders, and a snap ring is equipped with in the center of guide wheel inwall; Adding in the prescription of silicon nitride ceramic material has titanium carbonitride micro mist, tetragonal zircite micro mist, and adds magnesia (MgO), yittrium oxide (Y
2O
3), aluminium oxide (Al
2O
3), lanthana (La
2O
3) as additive; The shared mass percent of silicon nitride is 70～85% in the prescription, and the shared mass percent of titanium carbonitride micro mist is 0～15%, and the shared mass percent of tetragonal zircite micro mist is 5～10%, and the shared mass percent of additive is 10～14%.
2, a kind of manufacture method of guide wheel for high-speed rod-rolling mill is characterized in that: be to take following steps:
A, batching: earlier be that 70～85% ultra-fine alpha-phase silicon nitride powder, mass percent are that 0～15% super fine titanium carbonitride powder, mass percent are that 5～10% tetragonal zircite micro mist, mass percent are 10～14% additive weighing in proportion, the mixing be made up of ultra-fine alumina, ultrafine yttria, ultra-fine lanthana, super fine magnesia with mass percent;
B, moulding: through ball milling, drying, sieve, granulation, moulding, sintering circuit make the guide wheel base substrate;
C, fine finishining: the guide wheel base substrate is finish grinded processing, on inwall, process groove with thin skive again, snap ring (1) is contained in the inboard wall groove, just made silicon nitride ceramics guide wheel (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110248 CN1265903C (en) | 2002-04-01 | 2002-04-01 | Guide wheel for high-speed rod-rolling mill and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02110248 CN1265903C (en) | 2002-04-01 | 2002-04-01 | Guide wheel for high-speed rod-rolling mill and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448229A CN1448229A (en) | 2003-10-15 |
| CN1265903C true CN1265903C (en) | 2006-07-26 |
Family
ID=28680462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02110248 Expired - Fee Related CN1265903C (en) | 2002-04-01 | 2002-04-01 | Guide wheel for high-speed rod-rolling mill and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1265903C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173793B (en) * | 2011-03-16 | 2013-04-24 | 辽宁爱尔创生物材料有限公司 | Zirconia ceramic casing pipe and preparation process thereof |
| CN111606717A (en) * | 2020-06-08 | 2020-09-01 | 浙江锐克特种陶瓷有限公司 | Preparation method of high-strength and high-hardness silicon nitride wear-resistant sheet |
| CN114559304B (en) * | 2022-03-30 | 2023-05-02 | 卡贝尼新材料科技(上海)有限公司 | Large ceramic arc processing method |
-
2002
- 2002-04-01 CN CN 02110248 patent/CN1265903C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1448229A (en) | 2003-10-15 |
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