KR20180065774A - Device and method for grinding slab - Google Patents

Abstract

Provided are a casting grinding facility and a casting grinding method. In order to be able to perform a grinding operation by easily confirming twist of a cast-piece without aligning the cast-piece, the present invention comprises: a conveying line having a plurality of conveying rolls for supporting and conveying the cast-piece; a scratch detection unit disposed at a rear end of the conveying line in the casting direction to detect a surface scratch on the cast-piece; a grinder disposed above the conveying line for grinding the surface of the cast-piece; a measurement unit installed on the conveying line to measure the twist of the cast-piece relative to the conveying line; and a control unit for calculating a signal of the measurement unit to give a reference point of the grinder in accordance with the twisted state of the cast-piece.

Description

TECHNICAL FIELD [0001] The present invention relates to a grinding apparatus and a grinding apparatus,

The present invention relates to a casting grinding facility and a casting grinding method.

In general, slabs produced through steelmaking and casting processes are immediately rolled as hot-rolled coils and cold-rolled coils, but the castings that have been judged as constituent anomalous materials, quality anomalous materials, and dimensional anomalous materials are subjected to a flawed code, After being placed on the bed and cooled, scarfing and grinding are performed to completely remove the scratches on the surface of the slab, and then charged into the hot-rolling furnace.

The casting grinding apparatus is disposed on the conveying line and has a grinder for removing surface scratches on the casting sheet, and a scratching device for observing surface scratches is disposed at the trailing end of the conveying line along the advancing direction. The defect inspection apparatus reads the defective portion and transfers the defective portion position to the grinder, and the grinder performs the grinding at the transferred position to remove the surface defect of the casting. Since the grinder is operated by the coordinates according to the characteristics of the equipment, it is necessary to have a fixed reference point. Therefore, a large number of auxiliary devices are required to transport the cast to a fixed reference point.

In the conventional case, when the main body is moved onto the conveying line, it is usually conveyed without being aligned in the conveying line width direction. In this case, the workpieces arranged in a twisted state are aligned and moved to the reference position so that the grinder can work. Therefore, it takes a lot of time to align the reference position of the cast steel, and there is a problem that the equipment becomes complicated due to the additional equipment.

Further, in the process of moving the billet to the reference position on the transporting line, the billet pushed on the roller of the transporting line is pushed in the axial direction of the roller, and scratches are scratched on the billet due to friction between the billet and the rollers.

Provided are a casting grinding apparatus and a casting grinding method which are capable of producing a high quality product by preventing surface frictional scratches generated in the process of aligning the positions of the cast steel.

There is provided a casting grinding facility and a casting grinding method which are capable of performing necessary work by easily checking the twisting of the casting in the state without aligning the casting.

Provided is a casting grinding apparatus and a casting grinding method which can minimize the flow of casting during the grinding process and enhance stability.

The casting grinding facility of this embodiment includes a conveying line having a plurality of conveying rolls supported and supported by a casting material, a scratching portion disposed at a rear end of the conveying line along the casting direction to detect surface flaws on the casting slab, A grinder for grinding the surface of the cast steel, a measuring unit installed on the conveying line for measuring a twist of the casting to the conveying line, a signal calculating unit for calculating a signal of the measuring unit, And a control unit.

The measuring unit may include a plurality of distance measuring sensors disposed on at least one side of the transfer line and spaced apart from each other to measure a distance from the casting at each position.

The measuring unit may include a first distance measuring sensor disposed on at least one side of the transfer line for measuring a distance to the casting, a distance from the first distance measuring sensor to the casting at a position different from the first distance measuring sensor And a second distance measuring sensor for measuring the distance.

The control unit may be configured to calculate a distance between the first distance measuring sensor and the second distance measuring sensor and a deviation between the detection values of the two sensors to set a reference value in accordance with the twisting of the casting placed on the conveying line.

And a lifting unit installed on the transporting line for lifting and fixing the slab upon grinding, wherein the lifting unit includes a skid bar disposed between the transport rolls and moved up and down to lift up the slab placed on the transport roll, And a driving cylinder connected to a lower end of the bar to vertically move the skid bar, wherein a plurality of the skid bars are disposed along the transfer line at an interval, and the skid bar disposed at the center of the plurality of skid bars has an upper- It can be a structure relatively lower than a skid bar.

The method for grinding a cast steel according to this embodiment comprises the steps of conveying a casting along a conveying line, detecting a surface flaw of the casting being conveyed, fixing the casting after completion of the casting of the casting, measuring the degree of twisting of the casting placed on the conveying line A step of grinding the grinder with a reference point of the grinder in accordance with the twist of the measured casting, and a step of grinding the grinder by moving the grinder to the surface flaw occurrence position of the casting with reference to the reference point.

The step of measuring the position of the casting may include measuring the distance to the casting at two positions spaced apart from the side of the conveying line, measuring the distance between the two positions and the deviation of the measured distance from the casting And measuring the twist of the casting placed on the transfer line.

The grinding method of this embodiment further includes calculating a degree of twist of the cast steel, calculating whether the degree of twist is within a predetermined range, and moving the cast steel on the conveyance line when the degree of twist of the cast steel exceeds the set range can do.

According to this embodiment, grinding can be performed without aligning the position of the cast steel, thereby preventing the friction between the cast steel and the cast steel and thus the occurrence of surface flaws on the cast steel, thereby enhancing the quality of the product.

In addition, the process for aligning the position of the cast steel can be omitted and the facility can be simplified, thereby improving the productivity and reducing the cost.

In addition, when the cast steel is lifted, the cast steel can be reliably supported by the skid irrespective of the upward and downward bending of the cast steel, so that the flow of the cast steel can be minimized and the grinding can be performed accurately and stably.

1 is a schematic view showing a casting grinding apparatus according to the present embodiment.
2 is a schematic view showing a lifting structure of a cast slab grinding apparatus according to the present embodiment.
Fig. 3 is a schematic view showing a state in which the main shaft is lifted according to the present embodiment, in comparison with the prior art.
FIG. 4 is a schematic flow chart showing a casting process according to the present embodiment.
5 is a photograph showing a cast steel produced according to the present embodiment in comparison with a conventional cast steel.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that the embodiments described below may be modified in various ways without departing from the spirit and scope of the invention. But is not limited to the example.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive.

Fig. 1 shows a screed scarfing facility according to the present embodiment, and Fig. 2 schematically shows a lifting structure of screed scarfing facility according to the present embodiment.

As shown in FIG. 1, the casting grinding apparatus 100 of the present embodiment includes a conveying line 10 having a plurality of conveying rolls 12 supported by and supporting a cast S, A scratching portion 20 disposed at the rear end of the conveying line 10 to detect surface flaws of the slab S, a grinder 30 disposed on the conveying line 10 for grinding the surface of the casting piece, And a control unit 50 provided in the main body 10 for measuring the twist of the casting to the conveying line 10 and a control unit 50 for calculating a signal of the measuring unit and giving a reference point of the grinder 30 in accordance with the twisted state of the casting do.

In the following description, the y-axis direction in Fig. 1 is referred to as the longitudinal direction or the advancing direction of the cast steel, and the x-axis direction is referred to as the casting width direction.

The scalloped sculpture is passed through the scarfing facility to the grinding facility along the transfer line 10 and spun by a grinder.

A plurality of feed rolls (12) for feeding the slabs are arranged at intervals in the feed line (10). Between the feed rolls 12, skids 61 and 62 for supporting and supporting the cast steel s are disposed to prevent movement of the cast steel during grinding of the cast slab.

A defect inspection part (20) is arranged at the rear end of the conveyance line (10) along the course direction. The scratch detector 20 detects the position where the scratches are formed on the surface of the casting sheet to be moved. The slab S is moved to the lower portion of the grinder 30 via the scratching portion 20. In this process, whether or not scratches are formed and the position of occurrence of scratches on the scratched portion are accurately detected through the scratching portion 20.

A grinder 30 is disposed above the transfer line 10. The grinder 30 is provided with components necessary for three-dimensionally moving the grindstone to the surface flaw position of the slab S. Since the grinder 30 has already been described in detail, a detailed description thereof will be omitted.

In the present embodiment, the measuring section includes a first distance measuring sensor 40 disposed on at least one side of the conveying line 10 and measuring the distance from the casting S, And a second distance measuring sensor 42 for measuring the distance from the casting s at a different position from the distance measuring sensor 1.

In addition to the above structure, the measuring unit may include three or four or more distance measuring sensors for more precise measurement.

The first distance measuring sensor 40 and the second distance measuring sensor 42 may be sensors that precisely measure distances using, for example, a laser or an ultrasonic wave.

1, the first distance measuring sensor 40 and the second distance measuring sensor 42 are spaced apart from each other by a predetermined distance L on one side of the conveying line 10 and are arranged in the width direction of the casting , And the distance from the side of the cast steel along the width direction is measured. The first distance measuring sensor and the second distance measuring sensor may have the same structure.

The distance L between the first distance measuring sensor 40 and the second distance measuring sensor 42 can be variously set and the distance value is stored in advance in the controller 50 as data. The first distance measuring sensor 40 and the second distance measuring sensor 42 are accurately aligned in the x-axis direction of the transfer line 10, and the distances from the transfer line 10 and the transfer line 10 are the same. Thus, it is possible to detect whether or not the cast steel is twisted through the sensors disposed at two different positions.

Here, the twist of the cast steel S with respect to the conveyance line 10 means that the main axis is not aligned on the conveyance line 10 and is turned, and the rectangular coordinate in the longitudinal direction and the width direction of the casting is aligned with the xy- Which means that it does not exactly match.

If the primary slice placed on the transfer line 10 is not correctly aligned with respect to the width direction of the transfer line 10, a deviation will appear between the measured values of the first distance measurement sensor 40 and the second distance measurement sensor 42 . Accordingly, it is possible to accurately detect the placement state of the casting placed on the conveying line 10 through the deviation values detected by the two sensors. It is necessary to set the reference point of the grinder 30, which moves along the surface of the cast steel, to match the casted cast steel when the cast steel is placed on the conveying line 10.

The control unit 50 calculates a deviation between the distance L between the first distance measuring sensor 40 and the second distance measuring sensor 40 and the detection values L1 and L2 of the two sensors And the reference value is set in accordance with the twist of the cast steel placed on the transfer line 10. [

The controller 50 stores the distance L between the first distance measuring sensor and the second distance measuring sensor as data. The controller 50 calculates a deviation of the distance L 1 and the distance L 2 between the distance and the measured casting from each sensor and detects to what extent the main body is twisted on the conveying line 10. The control unit 50 is connected to the grinder 30 and transmits the reference point position corresponding to the twist of the casting placed on the transfer line 10 to the grinder 30.

Accordingly, it is possible to precisely check the position of the cast strip S without moving and aligning the cast strip S on the conveying line 10, thereby accurately providing the reference point of the grinder 30. Therefore, it is possible to prevent the friction between the cast steel and the conveying roll 12 on the conveying line 10 and hence the generation of the scratches.

When the reference point of the grinder 30 is applied in accordance with the position of the cast steel, the cast steel S placed on the conveying roll 12 by the lifting portion 60 is conveyed by the skids 61 and 62 The grinding operation is carried out. The lifting portion 60 supports the cast steel in the casting process and prevents the casting.

The grinding apparatus of the present embodiment has a structure that can reliably support the cast steel at two or more places even when the cast steel S is curved up and down to prevent it from flowing during grinding.

2, the lifting unit 60 includes a plurality of skids 61 disposed along the y-axis longitudinal direction of the transfer line 10, The height of the skid 62 is relatively lower than that of the adjacent skid 62. Here, the height of the skid may mean the height from the bottom of the equipment to the top of the skid along the z-axis direction of FIG.

In the present embodiment, five skids are disposed on the transfer line 10 of the grinding facility, and the height of the third skid 61 located at the center of the transfer line 10 is 40 mm or more smaller than the other skids 62. When the difference between the height of the skid 61 disposed in the middle of the transfer line 10 and the height of the adjacent skid 62 is less than 40 mm, the downwardly convexly curved slab is placed in the middle of the transfer line 10, So that there is a high possibility that flow occurs as in the conventional case.

As described above, in the present embodiment, even when the main body is bent and deformed convexly upward and downward along the y-axis direction, at least two or more skids of the skid can be stably supported by supporting the main body.

Fig. 3 shows a state in which the main shaft is lifted according to the present embodiment, in comparison with the prior art.

As shown in the embodiment of FIG. 3, according to the present embodiment, the slope of the skid disposed in the middle of the conveyance line is raised by the lifting portion having a structure relatively smaller than the adjacent skid height, Show a state in which the main body is lifted by a lifting part having skids all having the same height according to the prior art.

In both of the examples and the comparative examples, lifting was performed on the casts curved convex downward in the same manner.

As shown in Fig. 3, when the lifting portion is driven so that the skid lifts the cast placed on the transport roll, in the case of the embodiment, the skid arranged in the middle of the transport line is low in height and does not contact the cast, You can see that it has been brought into contact with the deployed skid. On the contrary, in the comparative example, it can be seen that the lower bent convex piece comes into contact with only the skid disposed in the middle of the transfer line.

In the case of the comparative example, there is a problem that the skid is damaged in the grinding process due to the weak bearing capacity of the slip by the skid as well as the damage of the skid by placing the slip on one skid.

However, in the present embodiment, since the main shaft is in contact with at least two skids, the skew damage is prevented by the weight dispersion of the main shaft, and the main shaft can be lifted more stably. Accordingly, it is possible to prevent the main part from flowing in the grinding process.

Hereinafter, the grinding process of the cast slab according to the present embodiment will be described with reference to FIG.

The scrapped scrap is fed to the grinding facility along the transfer line. In the casting process, a scratch on the surface is detected while passing through a defect inspection portion disposed at the rear end of the transfer line in the transfer process.

When the main cutting edge is completely conveyed to the lower part of the grinder of the conveying line, the progress is stopped, and the twisting state of the casting placed on the conveying line is detected through the measuring part.

The distance from the side of the casting is detected through the two sensors of the measuring part. The control part calculates the deviation of the measured value by the two sensors of the measuring part and the separation distance of the two sensors to calculate the twisting state of the casting on the conveying line. For example, if the distance between the front sensor and the casting along the conveying line is 1 m and the distance between the rear sensor and the casting is 1.1 m, the deviation of the measured value from both sensors is 0.1 m. If the distance between the two sensors is 5 m, the control unit calculates the values and accurately calculates the tilting and tilting of the main line by the value of 0.1 / 5 with respect to the xy coordinates of the transfer line.

When the degree of twisting of the cast steel is within a predetermined range, the control unit gives a grinder reference point to the casting twist along with the inspection data of the absorption tow unit with a grinder, and transmits the grinding reference point. Thus, it is possible to apply the reference point information to the grinder without aligning the strips on the transfer line. In the present embodiment, the setting range for the cast steel twist can be variously set according to equipment or working conditions. For example, the setting range may be set such that the distance deviation value by the two sensors is within 20 to 60 cm. Therefore, when the distance deviation value by the two sensors is within the above range, the reference point of the grinder can be given without moving the main shaft. If the setting range exceeds the above range, the twisting of the cast steel is severe. In this case, the workpiece is moved and aligned on the conveying line, and then the grinding is performed.

When the deviation value range is set to be less than 20 cm as the setting range for the cast steel twist, there is a problem that the cast steel must be moved even if the cast steel is slightly twisted because the set value is too small. There is a problem that the reference point should be given without moving the casting.

When the reference point of the grinder is confirmed, the lifting section is driven to lift the cast on the conveyance line up. Thus, the cast steel is placed and fixed on the skid of the lifting portion. In the ideal state, the grinder moves according to the flaw data based on the reference point, and the flaw on the surface of the slice is removed by grinding.

When the grinding operation is finished, the lifting part is driven down to lower the casting and complete the process.

Meanwhile, in the present embodiment, when the degree of twisting of the cast steel is out of the setting range in the cast steel twisting operation process by the control unit, the cast steel is moved and aligned before the grinding operation is performed. The slip moving alignment process is a process of sliding and moving the slip on the conventional transfer line, and the detailed description will be omitted.

5 is a photograph showing a cast steel produced according to the present embodiment in comparison with a conventional cast steel.

In the case of the comparative example, it is confirmed that the abrasion is caused by the abrasion of the abrasive grains according to the conventional process and the friction with the transfer roll when the abrasive is moved on the surface.

On the contrary, as mentioned in the case of the embodiment, it is understood that the grinding operation is performed at the position without moving the casting on the conveying line, and no frictional flaws are formed on the surface with the conveying roll.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

10: conveying line 12: conveying roll
20: Flaw detection part 30: Grinder
40: first distance measuring sensor 42: second distance measuring sensor
50: control unit 60: lifting unit
61, 62: skid

Claims (8)

A feed line disposed at a rear end of the feed line along the feed direction of the feedstock to detect a surface flaw on the feedstock, And a control unit provided on the transfer line for measuring a twist of the casting with respect to the transfer line and a control unit for calculating a signal of the measuring unit and giving a reference point of the grinder in accordance with the twisted state of the casting, equipment. The method according to claim 1,
Wherein the measuring unit includes a plurality of distance measuring sensors disposed on at least one side of the transfer line and spaced from each other to measure a distance from the casting at each position. The method according to claim 1,
The measuring unit includes a first distance measuring sensor disposed on at least one side of the transfer line for measuring a distance from the casting, and a second distance measuring sensor disposed at a distance from the first distance measuring sensor, And a second distance measuring sensor for measuring the distance. The method of claim 3,
Wherein the control unit calculates a distance between the first distance measuring sensor and the second distance measuring sensor and a deviation of the detection value of the two sensors to set a reference value in accordance with the twisting of the casting placed on the conveying line. 5. The method according to any one of claims 1 to 4,
Further comprising a lifting portion provided on the conveying line for lifting and fixing the slab upon grinding,
Wherein the lifting portion includes a skid bar disposed between the transport rolls and moved up and down to lift up a cast piece placed on the transport roll upwardly and a drive cylinder connected to a lower end of the skid bar to move the skid bar upward and downward, And a plurality of skid bars disposed at the center of the plurality of skid bars along a transfer line and having a lower height than a skid bar having a top height. Detecting a surface defect of the casting to be conveyed, fixing the casting after completion of the feeding of the casting, measuring the degree of twisting of the casting placed on the conveying line, measuring the degree of twisting of the casting placed on the conveying line, And grinding the grinding wheel to move the grinding wheel to the surface flaw occurrence position of the casting with reference to the reference point. The method according to claim 6,
Measuring the position of the casting comprises measuring the distance to the casting at two positions spaced apart from the side of the conveying line, measuring the distance between the two positions and the deviation of the distance from the casting at each position And measuring twist of the casting placed on the transfer line. 8. The method of claim 7,
Calculating a degree of twist of the cast steel, and calculating whether the degree of twist is within a predetermined range; and aligning and aligning the cast on the conveyance line when the cast steel torsion degree is out of the set range.

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