JP3642126B2 - Smooth roll matting treatment method and smooth roll obtained by the treatment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a matting treatment method in a grain grinding roll, in particular, a smooth roll for grinding wheat, and a smooth roll obtained by the treatment.
[0002]
[Prior art]
The rolls used in the wheat milling process include grinding brake rolls with a conspicuous surface and grinding the endosperm coarse grains in order to obtain coarse endosperm grains by grinding the wheat grains so that they are largely expanded. In order to obtain flour, there is a smooth roll whose surface is matted.
[0003]
The purpose of the smooth roll matting process is to increase the gripping force by using the entire roll surface 10 as a pear ground, finely grind the endosperm coarse grains supplied to the smooth roll without making them into flakes, and improve the grinding efficiency. The matting process supplies a single grain size of # 30 to # 60, for example, # 60 black silicon carbide between a pair of rolls rotating at different speeds in different directions. And it is performed by making an abrasive grain bite into the roll surface 10 by the pressure between rolls, and forming the biting part 13. FIG.
[0004]
However, in the above processing method, by forming a textured surface on the roll surface 10, it is possible to increase the grip force to some extent and improve the grinding efficiency of the smooth roll. However, for example, using # 60 black silicon carbide When the matting process is performed, it is difficult to form the biting portion 13 on the entire roll surface 10 because the grain size of the abrasive grains is relatively large, and the smooth surface portion 11 remains on the roll surface 10.
[0005]
When the endosperm coarse particles are pulverized using a smooth roll having the smooth surface portion 11, the endosperm coarse particles are not swallowed well into the roll gap, and the endosperm coarse particles are between the smooth surface portion 11 and the smooth surface portion 11. In addition to being crushed into flakes, there is a problem in that the powder quality deteriorates due to the increase in roll temperature generated at this time.
[0006]
Also, black silicon carbide is used as the abrasive grains, but black silicon carbide has a low hardness of the abrasive grains themselves, and the shape is somewhat rounded (the corners are not sharp). Even if it is a particle size, since the width of the particle size distribution is wide, it cannot sufficiently penetrate into the roll surface 10, and the bite portion 13 formed on the roll surface 10 is rounded so that the edge 12 of the bite portion 13 is rounded. There is also a problem that the bite is rounded and the biting depth of the biting portion 13 varies.
[0007]
When the endosperm coarse particles are pulverized using such a smooth roll, the endosperm coarse particles are pulverized at the round edge 12 and cannot be pulverized sharply. However, the endosperm coarse particles could not be pulverized to have a uniform particle size, and the powder quality was lowered due to the occurrence of flakes and variations in the particle size distribution.
[0008]
[Problems to be solved by the invention]
In view of the above problems, the present invention provides a matting treatment method that can form a biting portion with a uniform depth on the roll surface without forming a smooth surface portion on the roll surface and sharpen the edge of the biting portion. In addition, a technical problem is to provide a smooth roll that does not generate flakes, improves the pulverization efficiency, and can obtain a high-quality powder.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the matting method of the present invention sequentially supplies abrasive grains having different particle sizes between a pair of rolls rotating in opposite directions.
[0010]
Sequentially feed between rolls starting from small grain size.
[0011]
The abrasive grains are green silicon carbide.
[0012]
The smooth roll of the present invention is formed by sequentially supplying abrasive grains having different grain sizes between a pair of rolls rotating in the opposite direction.
[0013]
The abrasive grain having a small particle size is sequentially supplied between the rolls to form a textured surface.
[0014]
Technical measures were taken to make the abrasive grains green silicon carbide.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
[0016]
FIG. 1 is an explanatory view of a matting treatment method. In the matting treatment, green silicon carbide 3 is sequentially and evenly distributed over a roll surface 5 between a pair of rolls 1 rotating in different directions through a feed roll 2. This is done by supplying. The sequential supply of green silicon carbide of different particle sizes means supplying green silicon carbide 3 while gradually increasing or decreasing the particle size, supplying continuous abrasive grains, and supplying green silicon carbide 3 of a certain particle size. After that, there is a stepwise supply of abrasive grains in which green silicon carbide 3 having a different particle size is supplied again.
[0017]
When the final depth of the cut portion 4 of the textured surface is obtained by using, for example, # 30 to # 240 abrasive grains, before the # 30 to # 240 abrasive grains are supplied, The abrasive grains of # 60 to # 400 are supplied to the roll 1, and the minute biting portion 4 is formed on the entire roll surface 5. Note that the grain size of the abrasive grains supplied to the subsequent stage is larger than the grain size of the abrasive grains supplied in the previous stage.
[0018]
Referring to FIG. 2, the shape of roll surface 5 when the first stage treatment is performed using # 220 green silicon carbide and then the second stage treatment is performed using # 60 green silicon carbide. Will be described.
[0019]
The green silicon carbide 3 of # 220 smaller than the particle size of the green silicon carbide 3 supplied in the subsequent stage is supplied from the feed roll 2 to the roll 1A (A) before the matting treatment. Green silicon carbide 3 has higher hardness than black silicon carbide, has a sharp shape (sharp corners), and has a narrow width of single particle size distribution. Therefore, green silicon carbide 3 bites into the entire roll surface 5A, and roll surface 5A has a sharp corner portion 6B and a biting portion 4B having a uniform depth (about 2 μm), and the flat roll surface 5A has no smooth surface portion and has an infinite number of biting portions 4B as a whole. 5B (B).
[0020]
Then, the # 60 green silicon carbide 3 is supplied from the feed roll 2 to the roll 1B in which the minute biting portion 4B is formed over the entire surface. The green silicon carbide 3 deeply and deeply bites into the roll surface 5B, and the roll surface 5B has a fine biting portion 4B and a sharp corner portion 6C and a biting portion 4C having a uniform depth (about 25 μm). It becomes the surface 5C (C).
[0021]
When the endosperm coarse particles ground by the brake roll are pulverized using the smooth roll obtained by the matting process, the endosperm coarse particles supplied to the roll gap are formed at the corner 6B formed by the biting portion 4B. Due to the gripping force, it is caught in the roll gap with a strong force, and is sharply crushed without generating flakes by the sharp corner portion 6C formed by the biting portion 4C ground to a substantially constant depth.
[0022]
In the above embodiment, the matting process in which green silicon carbide having a small particle size is supplied to the roll in stages has been described. If done, the bite portion of the target depth is first formed on the roll surface, then the minute bite portion is formed on the roll surface where the bite portion is not formed, and the roll surface has no smooth surface portion. Since it becomes a pear ground having a deep bite portion and a fine bite portion, when the endosperm coarse particles are crushed using such a smooth roll of pear ground, flakes are not generated and flakes are generated There is no increase in the roll temperature due to the pulverization, the pulverization efficiency is improved, and a high quality powder with a uniform particle size can be obtained.
[0023]
【The invention's effect】
A pair of rolls rotating in the opposite direction are sequentially supplied with abrasive grains of different particle sizes to form a textured surface on the roll surface, so that a part of the flat roll surface is formed with a large particle size and a biting part is formed In addition, since the biting portion is formed by the abrasive grains having a small particle size in the other portions, the roll surface can be formed on a satin surface where no smooth surface portion exists.
[0024]
By supplying the abrasive grains from the abrasive grains having a small particle size, after forming a small biting portion on the entire roll surface in advance, a biting portion having a target depth is formed. It can be formed by a biting portion.
[0025]
By making the abrasive grains green silicon carbide, the biting portion can be formed with a substantially constant depth, and the corner portion of the biting portion can be formed sharply.
[0026]
By forming the smooth roll pear ground by sequentially supplying abrasive grains of different particle sizes between a pair of rolls rotating in the opposite direction, the surface of the smooth roll becomes a pear ground with no smooth surface, and this smooth pear ground is When the endosperm coarse particles are pulverized using a roll, flakes are not generated, and the roll temperature does not increase due to the generation of flakes, and a good quality powder can be obtained.
[0027]
By sequentially supplying between the rolls from abrasive grains having a small particle size, and forming a smooth roll finish, the surface of the smooth roll surely has a fine biting portion and a biting portion of a target depth, When a smooth pear surface with no smooth surface is formed and the endosperm coarse grains are crushed using the smooth roll of this pear ground, the endosperm coarse grains are well supplied to the roll gap by the fine bite, and the deep bite is surely Since it is pulverized, the pulverization efficiency is improved, flakes are not generated, and high-quality powder can be obtained.
[0028]
By forming a smooth roll pear ground using green silicon carbide, the biting portion formed on the smooth roll surface has a substantially constant depth and a sharp corner, and a smooth roll having this biting portion is formed. When the endosperm coarse particles are pulverized using the endosperm coarse particles, the endosperm coarse particles are pulverized sharply and with a uniform particle size, so that a high quality powder can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a matting processing method.
FIG. 2 is an explanatory diagram of a roll surface shape by matting processing.
FIG. 3 is an explanatory diagram of a shape of a roll surface obtained by a conventional matting process.
[Explanation of symbols]
1 Roll 2 Feed Roll 3 Green Silicon Carbide 4 Notch 5 Roll Surface 6 Corner

Claims (6)

In a smooth roll matting method in which abrasive grains are supplied between a pair of rolls rotating in the opposite direction and the outer peripheral surface of the roll is formed on a matte surface, abrasive grains having different grain sizes are sequentially supplied between the rolls. A smooth roll matting method characterized by the above. 2. The smooth roll matting method according to claim 1, wherein abrasive grains having a small particle size are sequentially supplied between the rolls. 3. The smooth roll matting method according to claim 1, wherein the abrasive grains are green silicon carbide. In a smooth roll in which abrasive grains are supplied between a pair of rolls rotating in the opposite direction and the outer peripheral surface of the roll is formed on a matte ground, the matte ground sequentially feeds the abrasive grains having different grain sizes between the rolls. Smooth roll characterized by being formed. The smooth roll according to claim 4, wherein abrasive grains having a small grain size are sequentially supplied between rolls to form the textured surface. The smooth roll according to claim 4 or 5, wherein the abrasive grains are made of green silicon carbide.

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