CN212042031U - A special steel bar cooling bed - Google Patents

Abstract

The utility model relates to a special steel bar cooling bed, which comprises a cooling bed body, wherein the upper part of the cooling bed body is provided with a heat preservation device, the heat preservation device comprises a heat preservation cover and guide rails arranged at the two sides of the cooling bed body, and the bottom of the heat preservation cover is provided with a roller matched with the guide rails; the cooling device is arranged at the top of the heat-insulating cover and comprises a plurality of water mist fans arranged at the top of the heat-insulating cover, water rings are wound on the water mist fans, a plurality of nozzles aligned with the cooling bed body are arranged on the water rings, and the water rings are connected with water inlet pipes; the cooling bed body is provided with a plurality of groups of parallel movable racks and fixed racks, and the middle part of each fixed rack is provided with an inclined plate. The utility model can ensure the straightness of the bar, improve the bar collecting temperature and control the performance and metallographic structure of the rolled bar; the special steel bar can be controlled and cooled in the structure transformation temperature zone according to the characteristics of the special steel, and the running time of the bar on a cooling bed after passing through the structure transformation temperature zone can be shortened.

Description

A special steel bar cooling bed

technical field

The utility model relates to the technical field of special steel bar production, in particular to a special steel bar cooling bed.

Background technique

Special steel refers to steel with special chemical composition (alloying), produced by special process, with special structure and properties, and can meet special needs. Common special steels include carbon steel, high-quality structural steel, and alloy steel. Wait. China's special steel includes high-quality carbon structural steel, alloy structural steel, carbon and alloy tool steel, spring steel, bearing steel, tool steel and other types of steel. Among the special steels, the bar products are the most widely used. The main steel types are bearing steel, spring steel, gear steel, non-quenched and tempered steel, etc. Each type of steel has different requirements for controlled cooling after the bar is rolled.

The traditional cooling bed moving rack and fixed rack are all equipped with teeth, the bar can only move one tooth by one, the running cycle of the bar on the cooling bed is fixed, the running speed is not easy to adjust, the specification bar below ∮70mm during the production process The rapid temperature drop of the bar and the low temperature of the cooling bed under the bar and the entry pit will lead to white spots or internal cracking defects in the special steel bar, and it is difficult to ensure the internal quality of the special steel bar. In addition, the traditional stepping rack cooling cannot control the cooling rate of the bar on the cooling bed, and the mechanical properties and metallographic structure of the bar cannot be effectively controlled in the hot-rolled state. Chinese Patent No. ZL201220359720.3 discloses a cooling bed capable of increasing the collection temperature of special steel, providing a cooling bed that can not only ensure the straightness of the bar but also increase the collection temperature of the special steel bar. Shorten the running time of the bar on the cooling bed, realize the high-temperature collection of the steel and slow cooling in the pit at a high temperature, and ensure the internal quality of the steel. However, this utility model patent, like the disadvantage of the traditional stepping cooling bed, cannot control the cooling rate of the bar on the cooling bed, and the mechanical properties and metallographic structure of the bar cannot be effectively controlled in the hot rolling state.

Utility model content

The technical problem to be solved by the utility model is: in order not only to ensure the straightness of the bar, but also to improve the collection temperature of the special steel bar, and at the same time to control the performance and metallographic structure of the rolled material.

In order to achieve the above purpose, the utility model provides the following technical solutions: a special steel bar cooling bed provided by the utility model includes a cooling bed body, and a heat preservation device is arranged on the upper part of the cooling bed body, and the heat preservation device includes a heat preservation cover and guide rails arranged on both sides of the cooling bed body, the bottom of the thermal insulation cover is installed with rollers matched with the guide rails; the top of the thermal insulation cover is provided with a cooling device, and the cooling device includes a plurality of water mist fans on the top, a water ring is arranged around the water mist fan, a plurality of nozzles aligned with the cooling bed body are installed on the water ring, and the water ring is connected with a water inlet pipe; A plurality of parallel movable racks and fixed racks are arranged on the cooling bed body, and an inclined plate is arranged in the middle of the fixed racks.

Further, the fixed rack is provided with teeth, and the teeth extend from the starting point of rolling of the rod to the swash plate; the movable rack and the fixed rack with the teeth cooperate to connect the rod The bar is rolled to the inclined plate, and the bar can be quickly rolled to the collection place by the height of the inclined plate and the gravity of the bar.

Further, the swash plate is installed on the fixed rack through a fixed card plate, and the fixed card plate can be clamped on the fixed rack during installation. The swash plate can be installed or removed according to production needs. Down.

Further, in order to make the thermal insulation effect better, the thermal insulation cover is wrapped with thermal insulation cotton.

Further, a cooling method for a special steel bar cooling bed, comprising the following steps:

S1. Determine the steel grade of the special steel bar;

S2. When the steel grade of the special steel bar belongs to the steel grade with strong white point sensitivity, and it is not necessary to control the mechanical properties and metallographic structure of the hot-rolled state, the operation steps for the special steel bar are as follows:

(1) Move the heat preservation cover and the cooling device as a whole to the entrance of the cooling bed body and turn off the water mist fan to ensure that the bars of the cooling bed body at high temperature are Reduce temperature loss on the cooling bed body;

(2) Start the cooling bed body, the rods roll through the heat preservation cover through the cooperation of the movable rack and the fixed rack, and then reach the inclined plate; The action of the inclined plate quickly rolls to the collection place;

S3. When the steel grade of the special steel bar belongs to non-quenched and tempered steel and bearing steel bar, and it is necessary to control the steel grade of mechanical properties or metallographic structure in the hot rolling state, the operation steps of the special steel bar as follows:

(1) Move the heat preservation cover and the cooling device as a whole to the entrance of the cooling bed body and turn on the water mist fan to rapidly cool the bar at high temperature to make the bar Quickly pass through the tissue transition temperature zone to ensure that the bar passing through the tissue transition temperature zone obtains ideal mechanical properties and metallographic structure;

(2) Start the cooling bed body, the rods roll through the heat preservation cover through the cooperation of the movable rack and the fixed rack, and then reach the inclined plate; The swash plate action rolls quickly to the collection.

Beneficial effects of the utility model: the cooling bed for special steel bars provided by the utility model can not only ensure the straightness of the bars, but also improve the collection temperature of the special steel bars, and at the same time, it can control the performance and performance of the rolled bars. Metallographic structure; through this cooling bed, the special steel bar can be controlled and cooled in the microstructure transition temperature zone according to the characteristics of the special steel grade, and the running time of the bar on the cooling bed after passing through the microstructure transition temperature zone can be shortened, so as to realize the high temperature of the steel. Collection and high temperature into the pit for slow cooling to ensure the internal quality of the steel.

Description of drawings

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structural representation of the present utility model;

Fig. 2 is the structural representation of the cooling device of the present invention;

Fig. 3 is the structural representation of the cooling bed body of the present invention;

In the picture: 1-cooling bed body, 2-guide rail, 3-roller, 4-water mist fan, 41-water ring, 42-nozzle, 5-water inlet pipe, 6-insulation cover, 7-bar, 8-movement Rack, 9-fixed rack, 10-inclined plate, 11-fixed card plate.

Detailed ways

The present utility model will now be described in further detail in conjunction with the accompanying drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the structures related to the present invention.

As shown in Figure 1, Figure 2 and Figure 3, a special steel bar cooling bed provided by the present invention includes a cooling bed body 1, the cooling bed body 1 is 2-3m wider than the existing cooling bed. The length of the cooling bed is 1/3 of the length of the cooling bed body 1 . The upper part of the cooling bed body 1 is provided with a heat preservation device, and the heat preservation device includes a heat preservation cover 6 and guide rails 2 arranged on both sides of the cooling bed body 1 . , the bottom of the thermal insulation cover 6 is equipped with a roller 3 matched with the guide rail 2, and the thermal insulation device can move back and forth according to the direction in which the bar 7 moves on the cooling bed body 1; the top of the thermal insulation cover 6 A cooling device is provided, and the cooling device includes four water mist fans 4 arranged on the top of the thermal insulation cover 6, and a water ring 41 is arranged around the water mist fan 4, and four water mist fans 4 are installed on the water ring 41. Aim at the nozzle 42 of the cooling bed body 1, the center of the nozzle 42 forms an angle of 45° with the air outlet surface of the water mist fan 4, and the central axis of the water mist fan 4 forms an angle of 60° with the vertical line to ensure The water mist can be blown onto the bar 7, and the water ring 41 is connected with the water inlet pipe 5; the cooling bed body 1 is provided with a plurality of groups of parallel movable racks 8 and fixed racks 9, the fixed teeth An inclined plate 10 is provided in the middle of the strip 9 .

As shown in FIG. 3 , the fixed rack 9 is provided with teeth, and the teeth extend from the starting point of the rolling of the bar 7 to the swash plate 10; the movable rack 8 and the gear with the teeth The fixed rack 9 cooperates to roll the bar 7 to the swash plate 10, and the height of the swash plate 10 and the gravity of the bar 7 enable the bar 7 to quickly roll to the collection place .

As shown in FIG. 3 , the swash plate 10 is installed on the fixed rack 9 through a fixing card 11, and the fixed card 11 can be clamped on the fixed rack 9 during installation. The swash plate 10 can be installed or removed according to production needs.

As shown in FIG. 1 , in order to make the thermal insulation effect better, the thermal insulation cover 6 is wrapped with thermal insulation cotton.

A cooling method for a special steel bar cooling bed, comprising the following steps:

S1. Determine the steel grade of the special steel bar;

S2. For spring steel, CrMo and CrNiMo gear steel, structural steel, tool steel and other high-carbon or high-alloy steels, steels with strong white point sensitivity, and do not need to control the mechanical properties and metallographic structure of the hot-rolled state The operation steps for the special steel bar are as follows:

(1) Move the heat preservation cover 6 and the cooling device as a whole to the entrance of the cooling bed body 1 and turn off the water mist fan 4 to ensure that the rods of the cooling bed body 1 are at high temperature. Material 7, reducing temperature loss on the cooling bed body 1;

(2) Start the cooling bed body 1, and the rod 7 reaches the swash plate 10 after rolling through the heat preservation cover 6 through the cooperation of the movable rack 8 and the fixed rack 9 ; Then, quickly roll to the collection place through the action of the inclined plate 10, and the collection temperature is 650-750 ° C;

S3. For non-quenched and tempered steel and bearing steel bar, it is necessary to control the mechanical properties or metallographic structure of the steel in the hot-rolled state. The operation steps for the special steel bar are as follows:

(1) Move the heat preservation cover 6 and the cooling device as a whole to the entrance of the cooling bed body 1 and turn on the water mist fan 4 to rapidly cool the bar 7 under high temperature, so that the The rod 7 quickly passes through the tissue transition temperature zone to ensure that the rod 7 passing through the tissue transition temperature zone obtains ideal mechanical properties and metallographic structure; the rod 7 enters the heat preservation cover at 620-650°C 6, to ensure that the bar 7 passing through the tissue transition temperature zone reduces temperature loss on the cooling bed;

(2) Start the cooling bed body 1, and the rod 7 reaches the swash plate 10 after rolling through the heat preservation cover 6 through the cooperation of the movable rack 8 and the fixed rack 9 ; Then, roll quickly to the collection place through the action of the inclined plate 10, and the collection temperature is 600-620 °C.

The special steel bar cooling bed provided by the utility model can not only ensure the straightness of the bar, but also can improve the collection temperature of the special steel bar, and at the same time can control the performance and metallographic structure of the rolled material; The special steel bar can be cooled according to the characteristics of the special steel grade in the microstructure transition temperature zone, and can shorten the running time of the bar on the cooling bed after passing through the microstructure transition temperature zone, so as to realize the high temperature collection of the steel and the slow cooling of the high temperature pit. , to ensure the internal quality of the steel.

Taking the above ideal embodiment according to the present invention as inspiration, through the above description, relevant staff can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present utility model is not limited to the content in the description, and its technical scope must be determined according to the scope of the claims.

Claims (4)

1. A special steel bar cooling bed, characterized in that it comprises a cooling bed body (1), the upper part of the cooling bed body (1) is provided with a thermal insulation device, and the thermal insulation device comprises a thermal insulation cover (6) and a The guide rails (2) on both sides of the cooling bed body (1) are provided with rollers (3) matched with the guide rails (2) at the bottom of the thermal insulation cover (6); and the top of the thermal insulation cover (6) is provided with There is a cooling device, the cooling device comprises a plurality of water mist fans (4) arranged on the top of the heat preservation cover (6), and a water ring (41) is arranged around the water mist fans (4), and the water A plurality of nozzles (42) aligned with the cooling bed body (1) are installed on the ring (41), and a water inlet pipe (5) is connected to the water ring (41); the cooling bed body (1) is provided with There are multiple groups of parallel movable racks (8) and fixed racks (9), and an inclined plate (10) is arranged in the middle of the fixed racks (9). 2. A special steel bar cooling bed according to claim 1, characterized in that: the fixed rack (9) is provided with teeth, and the teeth extend from the starting point of rolling of the bar (7) to the the inclined plate (10). 3 . The cooling bed for special steel bars according to claim 1 , wherein the inclined plate ( 10 ) is mounted on the fixed rack ( 9 ) through a fixed clamping plate ( 11 ). 4 . 4. A special steel bar cooling bed according to claim 1, characterized in that: the thermal insulation cover (6) is wrapped with thermal insulation cotton.

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