CN218542883U - Repairing layer structure of rolling mill screw-down nut - Google Patents
Repairing layer structure of rolling mill screw-down nut Download PDFInfo
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- CN218542883U CN218542883U CN202222848574.7U CN202222848574U CN218542883U CN 218542883 U CN218542883 U CN 218542883U CN 202222848574 U CN202222848574 U CN 202222848574U CN 218542883 U CN218542883 U CN 218542883U
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Abstract
The utility model relates to a repair layer structure of rolling mill screwdown nut belongs to nut technical field. The nut comprises a nut body, an internal thread is arranged in the nut body, the internal thread screw teeth comprise a plurality of substrate layers and a plurality of reinforcing layers, and the substrate layers and the reinforcing layers are alternately arranged in the height direction of the screw teeth. The utility model discloses a repair layer structure of rolling mill screwdown nut had both adopted the better substrate layer of toughness close with the parent metal to guarantee to weld amalgamation nature, had the wear resistance that the wear-resisting enhancement layer of high strength increased the screw tooth again, and the mode that substrate layer and enhancement layer arranged in turn has not only increased screw tooth wear resistance, has prolonged screwdown nut's life moreover.
Description
Technical Field
The utility model relates to a restoration layer structure of rolling mill screwdown nut belongs to nut technical field.
Background
The rolling mill is used for rolling a thick casting blank to a required thickness and generally comprises a frame, a rolling device, a main transmission device, a screw-down device, an upper roll balancing device, an elevation adjusting device, a dephosphorization guide device and the like. The rolling mill screwdown device is used for adjusting the horizontal position of the roller to ensure that the rolled piece rolls out the required section size according to the given rolling reduction, and the huge pressing force is also transmitted to the stand through the rolling mill screwdown device.
The screwdown devices can be divided into three types, namely manual screwdown, electric screwdown and hydraulic screwdown according to different actuators. The manual screw-down device is mainly used for equipment with infrequent change of constant-pressure screw-down quantity of a section mill; the hydraulic pressing device is mostly used in occasions with small pressing amount, high response speed and high adjustment precision; the electric pressing is the most commonly used upper wheel adjusting device in the rolling mill at present, and the conventional configuration of the electric pressing comprises a motor, a speed reducer, a brake, a pressing screw, a pressing nut, a thrust component, a pressing position measuring and displaying device, a pressure measuring instrument and the like.
The four-rod rolling mill screwdown device works frequently, a screwdown nut and a screwdown screw are required to be matched to frequently adjust the horizontal position of a roller, and the screwdown device has the disadvantages of complex operation condition and severe operation environment, and the screwdown nut rotates up and down frequently, so that abrasion cannot be avoided. The abrasion is the most common failure mode of mechanical equipment in the using process, and the abrasion of the screw-down nut can reduce the working efficiency of a screw-down mechanism, increase the energy consumption, aggravate the impact vibration of a rolling mill and reduce the reliability of the rolling mill. The life of the reduction nut has a great influence on the productivity and the product quality of the entire production line.
The size of the screw-down nut is larger, the screw-down nut with the specification of phi 1250 multiplied by phi 781 multiplied by 1000 has the single weight of 6740kg, and the screw-down nut is generally cast by high-strength copper alloy and is expensive.
After the screw-down nut is damaged, the traditional screw-down nut repairing mode is that the whole thread is completely removed in a turning mode, then integral surfacing welding is carried out on the inner surface of the screw-down nut in a welding mode, the inner diameter of the screw-down nut is surfacing welded to a specified height, and then machining is carried out on the inner side of the screw-down nut again to recover the size of the thread. The integral surfacing welding is carried out on the inner surface of the screw nut, so that a large amount of welding materials are needed, the welding materials are expensive, the repairing cost is high, a large amount of materials need to be machined in machining, and the machining time is long. The welding material selected for repairing the traditional screw down nut is generally similar to the welding material of the screw down nut, so that the service life of the repaired screw down nut is short.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a repair layer structure of rolling mill screwdown nut to improve or solve as above the traditional screwdown nut that exists among the prior art repair the material of welding of chooseing for use generally with screwdown nut similar material that welds, consequently the shorter technical problem of life of screwdown nut after restoreing.
The utility model provides a technical scheme as follows: the repairing layer structure of the rolling mill screw down nut comprises a nut body, an internal thread is arranged in the nut body, the thread of the internal thread comprises a plurality of base material layers and a plurality of reinforcing layers, and the base material layers and the reinforcing layers are alternately arranged in the height direction of the thread.
Furthermore, the layer of the screw teeth connected with the nut body is a substrate layer.
Further, the material of the base material layer is the same as or similar to that of the nut body.
Further, the nut body is made of a cast copper alloy material.
Further, the cast copper alloy is aluminum bronze.
Further, the cast copper alloy is aluminum brass.
Further, the cast copper alloy is brass.
Furthermore, the reinforcing layer is formed by overlaying high manganese aluminum bronze welding wires.
Furthermore, the reinforcing layer is formed by overlaying high-iron aluminum bronze welding wires.
Furthermore, the substrate layer and the reinforcing layer are formed in a spiral welding mode.
The technical scheme provided by the utility model, compared with prior art, following beneficial effect has: the utility model discloses a repair layer structure of rolling mill screwdown nut had both adopted the better substrate layer of toughness close with the parent metal to guarantee to weld amalgamation nature, had the wear resistance that the wear-resisting enhancement layer of high strength increased the screw thread again, and the mode that substrate layer and enhancement layer were arranged in turn has not only increased screw thread wear resistance, has prolonged screwdown nut's life moreover.
Drawings
Fig. 1 is a schematic structural view of a rolling mill screwdown nut of the present invention;
fig. 2 isbase:Sub>A sectional view taken along the linebase:Sub>A-base:Sub>A of fig. 1 according to the present invention;
FIG. 3 is an enlarged schematic view of the structure at B of the present invention;
in the figure, 1, a nut body; 2. a substrate layer; 3. and a reinforcing layer.
Detailed Description
The principles and features of the present invention are described below in conjunction with examples, which are set forth only to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1 to 3, a repairing layer structure of a rolling mill screw down nut comprises a nut body 1, wherein an internal thread is formed in the nut body 1, threads of the internal thread comprise a plurality of substrate layers 2 and a plurality of reinforcing layers 3, and the substrate layers 2 and the reinforcing layers 3 are alternately arranged in the height direction of the threads.
More specifically, the layer that the screw tooth is connected with nut body 1 is substrate layer 2.
The material of substrate layer 2 with the material of nut body 1 is the same or close, can guarantee with the welding fusibility of nut body 1.
The nut body 1 is made of cast copper alloy materials. The cast copper alloy material can be made of aluminum bronze, aluminum brass or brass, such as ZGuAl10Fe3, ZGuZn23Al6Fe3Mn2, ZGuZn25Al6Fe3Mn3, cuZn25A15Mn4Fe3-B, ZGuZn34Al2Fe2Mn3 and the like.
The enhancement layer 3 is formed by surfacing welding of high-strength wear-resistant high manganese aluminum bronze welding wires or high iron aluminum bronze welding wires, and the enhancement layer 3 can increase the wear resistance of the screw threads.
The substrate layer 2 and the reinforcing layer 3 are formed in a spiral welding mode. During welding, the base material layer 2 and/or the reinforcing layer 3 are only overlaid on the thread path, and the thread pitch of the welded base material layer 2 and the welded reinforcing layer 3 meets the machining requirement.
The repair layer structure of the rolling mill screw down nut is characterized in that a base material layer 2 and a reinforcing layer 3 are alternately arranged, wherein the base material layer 2 can ensure the welding fusion property with the nut body 1, and the reinforcing layer 3 can increase the wear resistance of screw teeth.
The first repair method of the rolling mill screw down nut is as follows:
the method comprises the following steps: machining the press nut with the worn internal thread, removing the worn internal thread, and integrally removing the internal thread on the press nut;
step two: selecting a welding wire which is the same as or similar to the base metal, such as an aluminum bronze, tin bronze or iron aluminum bronze welding wire, forming a base material layer 2 on the inner surface of the screw nut in a surfacing welding mode along the spiral direction of the original thread, wherein the base material layer 2 is spiral; the base material layer 2 is formed by surfacing welding of a welding wire made of the same material as the base material, and the bonding strength between the base material layer 2 and the nut body 1 can be guaranteed.
Step three: selecting a high-strength wear-resistant welding wire, such as a high-manganese-aluminum bronze welding wire or a high-iron-aluminum bronze welding wire, forming a base material layer 2 on the upper surface of the reinforcing layer 3 in a surfacing mode, and alternately welding the high-strength wear-resistant welding wire and the welding wire which is the same as or similar to the base material to form a thread structure in which the reinforcing layer 3 and the base material layer 2 are alternately arranged;
step four: and after welding is finished, finally restoring the size of the screw teeth in a machining mode.
The second repair method of the rolling mill screw down nut is as follows:
the method comprises the following steps: machining the press nut with the worn internal thread, removing the worn internal thread, not completely removing the internal thread on the press nut, and reserving a part of the original internal thread structure on the internal surface of the press nut;
step two: firstly, selecting high-strength wear-resistant welding wires such as high-manganese aluminum bronze welding wires or high-iron aluminum bronze welding wires, and forming a reinforcing layer 3 on the upper surface of the remaining internal threads in a spiral welding mode;
step three: welding wires which are made of the same materials as the base metal, such as aluminum bronze, tin bronze or iron aluminum bronze welding wires, are selected, a base material layer 2 is formed on the upper surface of the reinforcing layer 3 in a surfacing mode, and high-strength wear-resistant welding wires and welding wires which are made of the same materials as the base metal are alternately welded to form a thread structure in which the reinforcing layer 3 and the base material layer 2 are alternately arranged;
step four: and after welding is finished, finally restoring the size of the screw teeth in a machining mode.
The utility model discloses a rolling mill screwdown nut carries out spiral welding along the screw direction of former screw thread when restoreing the thread, has greatly reduced the welding volume, practices thrift and welds the material, reduces the repair cost to screw tooth combined type structure after the restoration has not only increased screw tooth wear resistance, has still prolonged screwdown nut's life.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. The repairing layer structure of the rolling mill screw down nut comprises a nut body (1), wherein an internal thread is formed in the nut body (1), and the repairing layer structure is characterized in that the thread of the internal thread comprises a plurality of base material layers (2) and a plurality of reinforcing layers (3), and the base material layers (2) and the reinforcing layers (3) are alternately arranged in the height direction of the thread.
2. The repair layer structure of the rolling mill screw down nut according to claim 1, characterized in that the layer where the screw teeth are connected with the nut body (1) is a base material layer (2).
3. The repair layer structure of the rolling mill screw down nut according to claim 1, characterized in that the material of the base material layer (2) is the same as or similar to the material of the nut body (1).
4. The repair layer structure of the rolling mill reduction nut according to any one of claims 1 to 3, characterized in that the nut body (1) is made of cast copper alloy material.
5. The repair layer structure of a rolling mill reduction nut of claim 4, wherein the cast copper alloy is aluminum bronze.
6. The repair layer structure of a rolling mill reduction nut of claim 4, wherein the cast copper alloy is aluminum brass.
7. The repair layer structure of a rolling mill reduction nut of claim 4, wherein the cast copper alloy is brass.
8. The repair layer structure for a rolling mill reduction nut according to claim 1, wherein the reinforcement layer (3) is formed by bead welding of high manganese aluminum bronze welding wires.
9. The repair layer structure of the rolling mill reduction nut according to claim 1, characterized in that the reinforcement layer (3) is formed by bead welding of high-iron aluminum bronze welding wires.
10. The repair layer structure of the rolling mill reduction nut according to claim 1, characterized in that the base material layer (2) and the reinforcing layer (3) are formed by means of spiral welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222848574.7U CN218542883U (en) | 2022-10-26 | 2022-10-26 | Repairing layer structure of rolling mill screw-down nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222848574.7U CN218542883U (en) | 2022-10-26 | 2022-10-26 | Repairing layer structure of rolling mill screw-down nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218542883U true CN218542883U (en) | 2023-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222848574.7U Active CN218542883U (en) | 2022-10-26 | 2022-10-26 | Repairing layer structure of rolling mill screw-down nut |
Country Status (1)
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|---|---|
| CN (1) | CN218542883U (en) |
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2022
- 2022-10-26 CN CN202222848574.7U patent/CN218542883U/en active Active
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