KR101811776B1 - Method for Casting Refiner Bar Plate and Refiner Bar Plate using the same and Refiner having the same - Google Patents

Abstract

The present invention relates to a method to cast a refiner bar plate using a silicone model, capable of minimizing decrease of a capacity of passed pulp even if being worn out; a casted refiner bar plate thereof; and a refiner including the same. According to one embodiment of the present invention, the method comprises: a mold forming step of forming a mold having a formation space with a shape corresponding to a shape of a bar and a base surface of a refiner bar plate to be formed; a silicone model forming step of filling heat resistant silicone in the formation space of the mold to form a silicon model; a sand model forming step of using the silicone model to form a mold with resin-coated sand; and a casting step of injecting a molten metal in the mold formed in the sand mold forming step to form a refiner bar plate.

Description

TECHNICAL FIELD The present invention relates to a refiner bar plate casting method using a silicon model, a refiner bar plate cast using the refiner bar plate, and a refiner including the refiner bar plate.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refiner bar plate casting method and a refiner bar plate cast using the same, and more particularly, to a refiner bar plate manufactured by using a silicone model to reduce the capacity To a refiner bar plate casting method using the same, and a refiner comprising the same.

In the production of pulp, raw materials of wood or vegetable fiber, or used and discarded waste paper are used as raw materials. The raw material is subjected to a refining process, which is the most important process in the papermaking process, and is subjected to a reforming process in the form most suitable for paper production (internal fibrillation, external fibrillation, fiber shortening, etc.) .

Therefore, the parts of the refiner which are carried out in the refining process should have excellent wear resistance and shape of the bar, and also have excellent corrosion resistance in order to withstand the corrosion.

The bar plate, which is a refiner for pulp and refiners used in cone-shaped conical bar type or disk-shaped digital bar type refiner, is a consumable part, and it depends on importing all but a part.

Such a bar plate has a conical or circular disc shape formed by combining a plurality of plates formed with a plurality of bars, and a thin bar having a thickness of about 0.6 to 6 mm may be formed as a comb And one set of two stator rotors and one stationary stator are provided in one set or two sets of stator and rotor are provided in one set to disintegrate the raw materials for papermaking.

The refiner is a device for mechanically fibrillating and modifying pulp fibers from a network of fibers forming woody fibrous materials such as wood chips, sawdust and vegetable fiber materials to suitably change paper production.

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Such a refiner comprises a rotor and a stator, and the above-described fiber-based materials are injected between the rotor and the stator while the rotor is rotated. The bar is formed by a bar formed to protrude from the rotor- So as to dissolve the base material. Therefore, such a bar plate is formed of a material requiring both abrasion resistance, high tensile strength, and corrosion resistance.

As shown in FIG. 1, the refiner is divided into a conical type and a disk type disk type (not shown), both of which are composed of a rotor 20 and a stator 10, And the stator 10 may be formed by coupling a plurality of rower bar plates 30, respectively.

The refiner bar plate 30 may be composed of a base 32 and a bar 34 as shown in FIG.

The base 32 is a component forming a base plate, and the bars 34 may protrude from the base 32 by a plurality of spaced apart portions.

Such a refiner bar plate 30 is disposed on the opposing surfaces of the rotor 20 and the stator 10 so as to be rotatable relative to the rotor 20 so that the groove 34 between the bar 34 and the bar 34 The bar 34 of the rotating rotor 20 mechanically reforms the pulp (fibrous material) passing through the groove 36 as the fibrous material flows through the filter 36.

Meanwhile, the refiner bar plate 30 may be formed by a casting process.

In the conventional manufacturing method using the refining of the refiner bar plate 30, a model having a shape of a refiner bar plate 30, which is a casting body, is manufactured. Then, a model is placed inside the flask and a resin- And then the mold is fired by heating.

Then, molten steel is injected into the manufactured mold, and then the refiner bar plate 30 is cast by cooling.

Generally, most castings use molds or molds to produce molds, in which case a minus slope must be formed for casting. Therefore, when the sand mold is fired by using the resin coordinate sand, a subtraction gradient can be formed in the mold in order to prevent collapse or breakage of the sand mold.

A minus slope is also formed in the mold formed by the mold, and as shown in FIG. 3, the refiner bar plate 30 manufactured by this mold is also subjected to a minus slope.

This subtraction gradient is applied such that the side of the bar 34 of the refiner bar plate 30 is formed to be inclined with respect to the base 32. Generally, this subtraction gradient is formed at about 2 to 2.5 degrees.

Meanwhile, when the refiner bar plate 30 is used, the bar is worn. If the wear is worn beyond the wear limit, the refiner bar plate 30 is replaced.

However, even if the wear of the refiner bar plate 30 is progressed, the ends of the bar 34 of the refiner bar plate 30 provided in the stator 10 and the ends of the refiner bar plate 30 30 should be kept constant between the ends of the bars 34. [

Therefore, in the field, wear of the refiner bar plate 30 is checked at regular intervals, and the interval between the stator 10 and the rotor 20 is narrowed by the amount of wear as shown in FIG.

As shown in FIG. 5, the bar 34 of the refiner bar plate has a minus slope and becomes thicker toward the base 32. This is because the grooves 36 The volume is reduced and the flow rate is reduced, which leads to a problem that the productivity is lowered.

For example, if a minus 1 degree gradient is applied, if the top thickness of the bar is 2 mm, the bottom thickness of the bar becomes 4 mm, and the volume of the groove between the bar and bar becomes smaller as it goes down.

In addition, the thickness of the bar 34 becomes thinner toward the end of the bar 34 due to the application of the subtraction gradient. The bar 34 is long and thin, which may cause breakage of the mold.

6, in order to maintain the distance between the rotor 20 and the bar 34 of the refiner bar plate 30 of the stator 10, (10) to the opposite side.

As described above, the plurality of refiner bar plates 30 are coupled to the opposite surfaces of the rotor 20 or the stator 10, thereby forming a coupling line 40. The coupling line 40 is a dividing line generated when the refiner bar plate 30 and the nearby refiner bar plate 30 come into contact with each other.

As shown in FIG. 6, when the bar 34 is positioned to extend over the joining line 40 of the partner refiner bar plate 30, there is a slight gap in the joining line 40, The portion corresponding to the gap does not cause less wear or wear than other parts.

In the related art, the coupling line 40 is formed parallel to the rotation direction of the rotor 20, so that the portion corresponding to the gap of the coupling line 40 is not continuously worn There will be a height difference with other places on the bar.

In this case, when the refiner bar plate 30 is moved forward, the unbraided bar 34 interferes with the counterpart bar 34, so that the gap can not be maintained. Therefore, before the refiner or bar plate 30 is replaced, The plate 30 may need to be replaced.

SUMMARY OF THE INVENTION The present invention is directed to a refiner bar plate casting method using a silicon model in which a decrease in flow rate is reduced even when a bar of a refiner bar plate is worn, and a refiner bar plate cast using the same, It is a challenge to provide.

It is another object of the present invention to provide a refiner bar plate casting method in which abrasion occurs uniformly and can be used up to an expected life, a refiner bar plate cast using the same, and a refiner including the same.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to one aspect of the present invention, there is provided a method of manufacturing a metal mold, including: forming a metal mold having a forming space corresponding to a shape of a bar and a surface of a refiner bar plate to be formed; Molding a silicon mold into a mold to form a mold as a resin-coated sand by using the silicon mold, and injecting molten steel into a mold formed in the mold forming step to form a refiner bar plate A refiner bar plate casting method using a silicon model including a casting step is disclosed.

The silicon model may be formed such that the surface corresponding to the bar of the refiner bar plate and the surface corresponding to the base are perpendicular to each other.

In the mold formed in the mold forming step, the minus angle of inclination of the surface forming the bar of the refiner bar plate may be 0 degree.

The resin-coated sand may have a curing temperature in the range of 150 to 200 degrees Celsius.

According to another aspect of the present invention, there is provided a refiner bar plate cast by a refiner bar plate casting method using the above-described silicon model, wherein the refiner bar plate includes a base for forming a body, Wherein the bar is formed such that its side surface is perpendicular to the base.

According to still another aspect of the present invention, there is provided a refiner comprising a refiner bar plate cast by a refiner bar plate casting method using the above-described silicon model,

The refiner includes a fixed stator and a rotor disposed at a predetermined distance to face the stator and rotated with respect to the stator,

Wherein each of the stator and the rotor is formed by a plurality of refiner bar plates coupled to each other on a surface facing each other, and a coupling line to which the refiner bar plates are coupled is not parallel or concentric with the rotation direction of the rotor, Lt; / RTI >

The refiner bar plate casting method using the silicone model of the present invention, the refiner bar plate cast using the same, and the refiner including the same, have the following effects.

Firstly, since the bar and the base are perpendicular to each other because the bar is not applied to the bar of the refiner bar plate, the width of the groove is not reduced even if the wear progresses, so that the decrease of the flow rate is minimized, The refiner bar replacement cycle can be taken longer and the cost can be reduced.

Second, since the connecting line of the refiner bar plate does not coincide with the rotation direction of the rotor, the bar of the refiner bar plate does not hang only on the connecting line, and the abrasion occurs normally, thereby preventing the early replacement of the refiner bar.

Third, since a mold of a silicone material having elasticity during casting of a refiner bar plate is used to form a mold, even when a complex mold is formed, there is less concern about collapse of the mold, so that more complicated and finer molds are formed The thickness of the bar of the refiner bar plate can be made thinner and the performance of the refiner can be improved.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

The foregoing summary, as well as the detailed description of the preferred embodiments of the present application set forth below, may be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown preferred embodiments in the figures. It should be understood, however, that this application is not limited to the precise arrangements and instrumentalities shown.
FIG. 1 is a view showing a conventional conical type refiner; FIG.
FIG. 2 is a sectional view showing a refiner bar plate provided in the stator and the rotor; FIG.
3 is a cross-sectional view showing a minus angle of deviation of the bar of the refiner bar plate;
FIG. 4 is a cross-sectional view showing a change in gap due to wear of a refiner bar plate; FIG.
FIG. 5 is a sectional view showing a change in groove area of a refiner bar plate due to wear; FIG.
FIG. 6 is a view showing a state in which wear occurs non-uniformly due to a bonding line of a refiner bar plate;
FIG. 7 is a flowchart illustrating a casting method of a refiner bar plate using a silicon model according to an embodiment of the present invention; FIG.
FIG. 8 is a cross-sectional view illustrating a mold for forming a silicon model according to an embodiment of the present invention; FIG.
FIG. 9 is a cross-sectional view of a mold die formed using a silicon mold according to an embodiment of the present invention; FIG.
FIG. 10 is a cross-sectional view showing a state in which a lower mold is formed in the mold of FIG. 9; FIG.
FIG. 11 is a cross-sectional view showing a shape of a mold of FIG. 9; FIG.
FIG. 12 is a view showing a state in which a refiner bar plate is cast using the mold of FIG. 9; FIG.
FIG. 13 is a cross-sectional view showing a variation in wear due to wear of a refiner bar plate cast using the mold die of FIG. 9; FIG.
FIG. 14 is a cross-sectional view showing a groove area change of the refiner bar plate according to the wear of FIG. 13; FIG.
15 is a perspective view showing a rotor and a stator to which a refiner bar plate is coupled according to an embodiment of the present invention; And,
Fig. 16 is a view showing the connecting line of the refiner bar plate and the rotating direction of the rotor of Fig. 15;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

Hereinafter, a refiner bar plate casting method using a silicon model according to an embodiment of the present invention will be described.

As shown in FIG. 7, the refiner bar plate casting method using the silicon model according to the present embodiment includes a mold forming step S110, a silicon model forming step S120, a sand mold forming step S130, and a casting step S140 ).

The mold forming step S110 is a step of forming dies 112 and 114 having a forming space corresponding to the bar 134 of the refiner bar plate 130 to be cast and the silhouette of the surface of the base 132 .

These molds 112 and 114 may have the entire shape of the refiner bar plate 130 to be formed or may be formed in the same direction as that of the bar 134 and the base 132 of the refiner bar plate 130, Or may have a shape having a silhouette of a surface shape. The molds 112 and 114 may be made of a material having excellent heat resistance and strength such as metal.

8, the molds 112 and 114 include a bar 134 in the form of a silicon die 110 to be formed and a silicon mold for forming a silicon having a silhouette of the surface shape of the base 132 And a silicon support mold 112 which is combined with the silicon mold 114 to form a silicon formation space.

A plurality of fins may be formed on the silicon support metal mold 112 to form the bar 134.

Therefore, after the silicon is positioned between the silicon supporting mold 112 and the silicon forming mold 114, the silicon supporting mold 112 and the silicon forming mold 114 are pressed and the silicon is deformed, (110) may be formed.

When the silicon supporting die 112 and the silicon forming die 114 are separated from each other, the silicon of the silicon die 110 may be deformed in the form of being covered with a fin of the silicon supporting die 112 .

At this time, the surface forming the surface corresponding to the bar side of the refiner plate of the silicon mold 110 of the mold for forming the silicon mold 110 and the surface forming the surface corresponding to the base may be formed to be vertical have.

The silicon model forming step S120 is a step of forming a silicon model by filling the space formed with the molds 112 and 114 with heat-resistant silicon.

The silicon mold 110 may be formed along the shape of the space in which the molds 112 and 114 are formed. Therefore, the surface corresponding to the bar side surface of the refiner plate of the silicon model 110 and the surface corresponding to the surface of the base can be vertical.

At this time, the material of the silicon mold 110 may be heat-resistant silicone which can withstand a change of shape even at a high temperature of 300 to 400 degrees.

The mold forming step S130 is a step of forming a mold by inserting the silicon mold 110 and the resin-coated sand 128 formed in the silicon mold forming step S120 into the flask 126. [

The resin-coated sand 128 used in this step may be a low-temperature resin-coated sand of a bauxite series having a melting point of about 1850 degrees C and curing at a temperature of 150 to 220 ° C., and a particle size of 100 mesh- And may have a peak value of 140 mesh.

Since the surface forming the surface corresponding to the bar side of the refiner plate 130 of the silicon model 110 and the surface forming the surface corresponding to the base are perpendicular to each other, The surface forming the surface corresponding to the bar side surface of the refiner plate 130 of the serpentine mold 120 and the surface forming the surface corresponding to the base may be perpendicular to each other.

That is, the angle of inclination of the surface forming the surface corresponding to the bar side surface of the refiner plate and the surface forming the surface corresponding to the base may be 0 degree. Nevertheless, since the core provided in the mold 120 is a silicon mold 110 made of silicone having elasticity, the mold 120 may not be broken when the core is removed.

9, the mold 120 may be divided into a top mold 122 and a bottom mold 124, and a portion forming the shape of the base 132 may be divided into a top mold 122 122), and the portion forming the shape of the bar may be referred to as a lower die 124.

In forming the lower mold 124, the silicon mold 110 is heated to a temperature ranging from 150 to 220 degrees, placed in a flask 126, and a low temperature resin-coated sand 128 is introduced The silicone mold 110 can be removed from the molding die after completion of the post-heat curing. At this time, the silicon die 110 may be coupled to the silicon support die 112.

When the silicone mold 110 and the low-temperature resin-coated sand 128 are introduced into the flask 126, the silicon mold 110, which supports the silicone mold 110 as shown in FIG. 10, ) Can be used in a combined state. The silicon support metal mold 112 may be formed of a variety of materials such as a metal or a non-ferrous metal capable of coping with the thermosetting temperature of the resin-coated sand 128. The silicone mold 110 can be prevented from being deformed by the weight and pressure of the resin-coated sand 128 since the silicone-supporting metal mold 112 is bonded to the silicone mold 110.

In addition, since the silicone mold 110 having elasticity is put on the surface of the silicon supporting metal mold 112, even when the silicon mold 110 is detached, the resin-coated sand 128 ) May not collapse.

Of course, when the upper mold 122 forming the shape of the base 132 is formed, the mold 116 having the shape of the base 132 is attached to the flask 126 and the resin- The upper mold 122 can be formed using the upper mold 128.

On the other hand, the mold 120 having the shape of a zircon is used as a mold for forming the zircon sand and the solvent is mixed with alcohol. The solvent is preliminarily dried with a propane gas torch, Shape as car spray gun. And, after shaping, it is absolutely necessary to perform a complete drying in a propane gas torch or a continuous drying furnace of 150 to 200 degrees centigrade.

12, molten steel is injected into the casting mold 120 having the upper and lower molds 122 and 124 formed in the casting mold forming step S130, which are assembled in the casting step S140, Thereby forming the plate 130.

In this case, when the molten steel is injected, molten steel is injected from the upper part in a state where the fin of the silicon supporting metal mold 112 is directed downward, and the molten steel is filled from the lower side to the upper side of the casting mold 120 Or may be cast by an in-mold casting method in which molten steel is injected while the fin of the silicon supporting mold 112 faces upward.

In addition, the position of the sprue plug into which molten steel is inputted and the position of the scouring spout for the sprue can be arbitrarily selected depending on the shape of the refiner bar plate 130.

Since the sand forming the serpentine mold 120 is a low-temperature resin-coated sand 128, the width of the bar can be formed to a relatively small width of 2.0 mm to 2.5 mm.

In the casting step S140, the refiner bar plate 130 may be completed by injecting molten steel into the casting mold 120, cooling the casting mold 120, and disassembling the casting mold 120. FIG.

Of course, a finishing process may be performed after the refining of the refiner bar plate 130 after the casting step (S140) to remove an unnecessary portion.

Meanwhile, the refiner bar plate 130 cast by the refiner bar plate casting method using the above-described silicon model may include a bar 134 and a base 132, as shown in FIGS. 12 and 13.

The base 132 may form a body of the refiner bar plate 130, and the bars 134 may protrude from the base 132 at a distance from one another.

At this time, since the minus angle of inclination of the surface forming the surface corresponding to the side of the bar 134 of the refiner plate 130 of the mold die 120 and the surface forming the surface corresponding to the base 132 is 0 degree , The side of the bar 134 of the refiner bar plate 130 formed in the casting step S140 and the base 132 may also be vertical

That is, the distance between the bar 134 and the bar 134 may not be narrowed or widened from the end of the bar 134 to the root, and may be uniform.

The thickness of the bar 134 is between 2.0 and 2.5 mm and the depth of the groove between the bar 134 and the bar 134 may be between 9 and 15 mm.

In accordance with the use of the refiner bar plate 130, the bar 134 may be worn as shown in FIG.

Therefore, in order to maintain the gap between the bar 134 and the bar 134 of the refiner bar plate 130 facing each other during use, the refiner bar plate 130 is brought close to each other according to the abrasion. At this time, As can be seen, the width of the groove 136 is wider than that of the conventional bar having a minus slope, so that a decrease in the flow rate is reduced.

15, a plurality of the refiner bar plates 130 may be mounted on the surfaces of the respective rotors 20 and the opposite surfaces of the state 10, respectively.

That is, the refiner bar plate 130 provided on the surface of the rotor 20 is moved with respect to the refiner bar plate 130 provided on the surface of the state 10 according to the rotation of the rotor 20.

15 and 16, a plurality of refiner bar plates 130 may be combined to form a coupling line 140 between adjacent refiner bar plates 130. In this case, 140 may not be parallel or concentric with the rotation direction of the rotor 20.

That is, when the refiner is of a conical type, it is formed so as not to be parallel to the rotation direction of the rotor 20 of the coupling line 140 of the refiner bar plate 130. When the refiner is a disk type (not shown) The coupling line of the refiner bar plate may be formed so as not to be concentric with the rotation center of the rotor.

The bar 134 of the refiner bar plate 130 of the rotated rotor 20 is connected to the bar 10 of the refiner bar plate 130 coupled to the state 10 via the coupling line 140 of the refiner bar plate 130 The abrasion can be uniformly caused. Therefore, the non-uniform wear of the bar 134 of the refiner bar plate 130 by the coupling line 140 between the refiner bar plates 130 does not occur and the refiner bar plate 130 can be used up to the expected lifetime, .

16, the coupling line 140 of the refiner bar plate 130 and the rotation direction R of the rotor 20 may have a relative angle of about 3 degrees. The drawings are exaggerated in order to show more dramatic changes.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10: stator 20: rotor
110: silicon model 112: silicon support mold
114: Mold for making silicon 120: Mold for die
122:
126: Flask 128: Resin coated sand
130: Refiner bar plate 132: Base
134: Bar 136: Groove
140: Coupling line R: Rotation direction of the rotor
S110: Mold Forming Step S120: Silicon Model Forming Step
S130: die casting step S140: casting step

Claims (6)

A silicon forming mold having a silhouette of a shape of a bar and a base surface of a refiner bar plate to be formed and a silicon forming space formed by being combined with the silicon forming mold to form a plurality of fins for supporting the silicon forming the bar shape A mold forming step including a silicon supporting mold to form a mold having a forming space of a shape corresponding to a shape of a bar and a base surface of a refiner bar plate to be formed;
A silicon model forming step of filling a space for forming the mold with heat-resistant silicon to form a silicon model;
A mold forming step of forming a mold as a resin-coated sand by using the silicone mold;
A casting step of injecting molten steel into the casting mold formed in the casting mold forming step to form a refiner bar plate;
/ RTI >
The silicon is a material having elasticity,
In the step of forming the mold,
An upper mold forming a shape of a base of a refiner bar plate to be formed and a lower mold forming a shape of a bar of a refiner bar plate to be formed,
When the lower mold is formed,
A refiner bar plate casting method using a silicone model formed by placing a flask in a silicon mold with a silicon support mold coupled and a resin coated sand. The method according to claim 1,
In the silicon model,
A refiner bar plate casting method using a silicon model formed such that a surface corresponding to a bar of a refiner bar plate and a surface corresponding to a base are perpendicular to each other. The method according to claim 1,
In the mold formed in the mold forming step,
Wherein a refractor bar plate is formed on a surface of the bar having a minus angle of inclination of 0 deg. The method according to claim 1,
The resin-
A refiner bar plate casting method using a silicone model wherein the curing temperature is in the range of 150-200 degrees Celsius. delete delete

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