CN111308057B - Method for determining wood section processing conditions for veneer cutting and evaluating processing effect - Google Patents

Method for determining wood section processing conditions for veneer cutting and evaluating processing effect Download PDF

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CN111308057B
CN111308057B CN201911063795.XA CN201911063795A CN111308057B CN 111308057 B CN111308057 B CN 111308057B CN 201911063795 A CN201911063795 A CN 201911063795A CN 111308057 B CN111308057 B CN 111308057B
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treatment
wood
hardness
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CN111308057A (en
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青龙
王喜明
李哲锋
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Inner Mongolia Agricultural University
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Inner Mongolia Agricultural University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/46—Wood
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0266—Cylindrical specimens

Abstract

The invention discloses a method for determining wood section treatment conditions for veneer cutting and evaluating treatment effect, which is characterized by comprising the steps of manufacturing a test piece, selecting raw wood with the average water content of more than 80 percent to manufacture the test piece, manufacturing wood into a hardness test piece, and then performing water soaking and water saturation treatment to prepare a water saturation test piece; measuring the hardness of the cross section, the chord section and the radial section of the wood; after manufacturing a smooth-grain shear strength test piece, carrying out water soaking and water saturation treatment, and preparing a water saturation test piece; selecting a treatment method according to the density characteristics of the wood; determining the processing temperature through the parameters obtained by processing, and finally determining the processing time; the anisotropy of the wood can be improved according to the density characteristics of the wood by adopting a classification treatment mode; the proper wood processing conditions are directly selected through the parameters, so that mechanical equipment precision and adjustment errors in the indirectly selected processing conditions, cutting parameters and many influence factors in the cutter aspect can be avoided, and the veneer and veneer cutting quality can be improved.

Description

Method for determining wood section processing conditions for veneer cutting and evaluating processing effect
Technical Field
The invention relates to the field of wood processing, in particular to a method for determining wood section processing conditions for cutting a single board.
Background
The wood is an anisotropic material, the anisotropy is mainly embodied in the three section directions of a transverse section, a chord section and a radial section, and when the properties of the three directions or two directions are close from the viewpoint of veneer cutting (slicing and rotary cutting), the anisotropy of the wood can be reduced, so that the cutting performance of the wood is improved. Thus, treating wood improves its cutting performance to some extent.
The present wood segment for cutting veneer (veneer) (in the production of plywood, the log or wood beam with a certain length specification for cutting veneer is called wood segment) is mainly treated by using hydrothermal treatment (soaking boiling, cooking). For wood with low density, the treatment effect is not good or the treatment is not carried out, which affects the quality of the veneer, therefore, different treatment methods are needed to be selected according to the performance characteristics of the wood. And the evaluation of the treatment quality effect is carried out indirectly. That is, the properties of the cut veneer (veneer) were measured to evaluate the wood fragment treatment conditions, and appropriate treatment conditions were selected. However, the single board cutting process includes many other factors, such as cutting parameters, tool conditions, and machine tool precision and adjustment, and the improved effect of the wood processing method cannot be accurately evaluated. For example, tests show that the sharpness of the cutter has a remarkable influence on the cutting quality, and the tests show that the sharpness of the edge is 0.3
Figure 122183DEST_PATH_IMAGE002
The minimum thickness of the cutting tool is about 0.06 mm; edge sharpness 2
Figure 792199DEST_PATH_IMAGE002
The minimum cutting thickness is about 0.2 mm. At present, the sharpness of the edge of the domestic cutter for cutting the single plate is difficult to reach 2
Figure 906786DEST_PATH_IMAGE002
The veneer cutting quality is affected as follows. The individual or combined effects of these factors cannot always be avoided with respect to the above-mentioned problems.
Finally, because the evaluation and the determination of the wood segment treatment effect are inaccurate, the waste of energy, manpower and material resources is caused. The quality of the veneer (veneer) is influenced, and the enterprise benefit is influenced.
Therefore, the quality of the veneers (veneers) is improved, energy and manpower and material resources required by wood section treatment are reduced, and a classification treatment method and a direct evaluation method of treatment effect are necessary to be researched according to the characteristics of the wood, so that the optimal treatment condition is determined.
Disclosure of Invention
The present invention is directed to a method for determining a processing condition of a wood segment for cutting a veneer and a method for evaluating a processing effect, so as to solve the above-mentioned technical problems in the background art.
A method for determining the wood section processing conditions for veneer cutting, namely an effect evaluation method, is characterized by comprising the following steps:
s1, manufacturing a test piece: selecting a raw material with the average water content of more than 80% to manufacture a test piece, and performing water soaking and water saturation treatment after manufacturing a hardness test piece according to GB/T1929-2009 'Wood physical mechanical test material sawing and sample intercepting method', so as to prepare a water saturation test piece; determining the hardness of the cross section, the chord section and the radial section of the wood according to GB/T1941-2009 Wood hardness test method; a water-soaking and water-saturating treatment is carried out after a grain-following shear strength test piece is manufactured according to Japanese industrial standard | JISZ2101-1994 shear test method (8) of wood, and a water-saturating test piece is prepared.
s2, selecting a treatment method according to the wood characteristics:
determining the density of the corresponding wood according to the existing data, or determining the density of the wood, and dividing the wood into low-density wood and high-density wood; the density of the wood is 0.5g/cm under the equilibrium treatment condition3Hereinafter referred to as low density, the density being 0.5g/cm3The above is referred to as high density;
for densities above 0.5g/cm3The hydrothermal treatment method is selected for the wood, and the hydrothermal treatment is carried out; the calculation of the relevant parameters is performed according to the following definition requirements:
national standard hardness value of cross section after treatment (
Figure DEST_PATH_IMAGE004
) And cross section hardness value of water-saturated test piece (
Figure DEST_PATH_IMAGE006
) The percentage of (A) is referred to as a reduction rate of cross-sectional hardness (
Figure DEST_PATH_IMAGE008
) As shown in the following equation 1
Figure DEST_PATH_IMAGE010
(1)
International hardness value of string section after treatment (
Figure DEST_PATH_IMAGE012
) And hardness value of tangent plane of water-saturated test piece (
Figure DEST_PATH_IMAGE014
) The percentage of (A) is referred to as the reduction rate of the hardness of the tangent plane (
Figure DEST_PATH_IMAGE016
) As shown in the following equation 2
Figure DEST_PATH_IMAGE018
(2)
International hardness value of diameter section after treatment (
Figure DEST_PATH_IMAGE020
) And the radial section hardness value of the water-saturated test piece (
Figure DEST_PATH_IMAGE022
) The percentage of (D) is called as a reduction rate (J) of the diametral cut surface hardness, as shown in the following equation 3
Figure DEST_PATH_IMAGE024
（3）
Treatment ofHardness value of posterior tangent plane: (
Figure 468086DEST_PATH_IMAGE012
) And the national standard hardness value of the cross section (
Figure 984518DEST_PATH_IMAGE004
) The percentage of (A) is referred to as the cross-sectional softening rate: (
Figure DEST_PATH_IMAGE026
) As shown in the following equation 4
Figure DEST_PATH_IMAGE028
（4）
International hardness value of diameter section after treatment (
Figure 625102DEST_PATH_IMAGE020
) Chord tangent plane hardness value
Figure 226985DEST_PATH_IMAGE012
) The percentage of (A) is referred to as the tangent softening rate (
Figure DEST_PATH_IMAGE030
) As shown in the following equation 5
Figure DEST_PATH_IMAGE032
（5）
Treated shear strength values (
Figure DEST_PATH_IMAGE034
) And shear strength value of water-saturated test piece
Figure DEST_PATH_IMAGE036
) The percentage of (A) is referred to as a shear strength reduction rate: (
Figure DEST_PATH_IMAGE038
) As shown in equation 6
Figure DEST_PATH_IMAGE040
（6）
The following respective values are referred to in the case of hydrothermal treatment: the reduction rate of the hardness of the cross section is about 76 percent, and the reduction rate of the hardness of the chord section and the radial section is about 81 percent; the softening rate of the cross section is about 96 percent, and the softening rate of the chord section is about 95 percent; the reduction rate of the shear strength is about 90 percent;
for densities below 0.5g/cm3The raw wood of (1) is frozen (the raw wood is frozen under the conditions of different temperatures and different time periods), and relevant parameters are calculated according to the following definition requirements: cross-sectional hardness value after treatment (
Figure DEST_PATH_IMAGE042
) And cross section hardness value of water-saturated test piece (
Figure DEST_PATH_IMAGE044
) The percentage of (A) is referred to as a cross-sectional hardness increase rate (
Figure DEST_PATH_IMAGE046
) As shown in equation 7
Figure DEST_PATH_IMAGE048
（7）
Hardness value of tangent plane after treatment (
Figure 60817DEST_PATH_IMAGE012
) And hardness value of tangent plane of water-saturated test piece (
Figure 431756DEST_PATH_IMAGE022
) The percentage of (A) is referred to as the rate of increase in the hardness of the tangent plane (
Figure DEST_PATH_IMAGE050
) As shown in equation 8
Figure DEST_PATH_IMAGE052
（8）
Hardness value of radial section after treatment (
Figure DEST_PATH_IMAGE054
) And the radial section hardness value of the water-saturated test piece (
Figure DEST_PATH_IMAGE056
) The percentage of (A) is referred to as the radial hardness increase rate (
Figure DEST_PATH_IMAGE058
) As shown in equation 9
Figure DEST_PATH_IMAGE060
（9）
Hardness value of tangent plane after treatment (
Figure 830858DEST_PATH_IMAGE012
) And cross-sectional hardness value
Figure 654457DEST_PATH_IMAGE042
) The percentage of (B) is referred to as the cross-sectional hardness change rate: (
Figure DEST_PATH_IMAGE062
) As shown in equation 10
Figure DEST_PATH_IMAGE064
（10）
Hardness value of radial section after treatment (
Figure 839451DEST_PATH_IMAGE054
) Chord tangent plane hardness value
Figure 64896DEST_PATH_IMAGE012
) The percentage of (A) is referred to as the chord section hardness change rate (
Figure DEST_PATH_IMAGE066
) As shown in equation 11
Figure DEST_PATH_IMAGE068
（11）
Treated shear strength values (
Figure 575512DEST_PATH_IMAGE034
) And shear strength value of water-saturated test piece
Figure 151986DEST_PATH_IMAGE036
) The percentage of (A) is referred to as the shear strength increase rate: (
Figure DEST_PATH_IMAGE070
) As shown in formula (12)
Figure DEST_PATH_IMAGE072
（12）
In the case of the freezing treatment, the following respective values are referred to: when the three-section hardness increase rate is about 109 percent, the cross-section hardness increase rate is about 115 percent, and the radial-section hardness increase rate is about 121 percent; the change rate of the cross section hardness is about 96 percent; the hardness change rate of the tangent plane is about 98 percent; the shear strength increase rate is about 111%; is the optimum processing temperature.
s3 determining the treatment temperature
And determining the treatment temperature of the corresponding wood according to the corresponding treatment parameters calculated by the above defined formula.
s4 determining processing time
Determining the treatment time according to the radius of the specific wood segment, and determining the treatment time by adopting the hardness change speed of hydrothermal treatment and the hardness change speed of freezing treatment;
in the wood section hydrothermal treatment process, the time when the cross section hardness reduction value from the outer surface of the wood section to the random (respectively measuring the hardness of the edge wood and the core material) reaches the calculated value of the formula (1) is selected as the treatment time, and the radius of the wood section is (C), (B), (C), (D) and D)
Figure DEST_PATH_IMAGE074
) And the time required (
Figure DEST_PATH_IMAGE076
) The ratio of (A) to (B) is called the hydrothermal hardness change rate: (
Figure DEST_PATH_IMAGE078
) (ii) a As shown in equation 13
Figure DEST_PATH_IMAGE080
（13）
In the wood section freezing treatment process, the time from the outer surface of the wood section to the random (respectively measuring the edge wood and core material hardness) cross section hardness increase value to the calculated value of the formula (7) is selected as the treatment time, and the radius of the wood section is (C), (B), (C), (D) and D)
Figure 737076DEST_PATH_IMAGE074
) And the time required (
Figure 817028DEST_PATH_IMAGE076
) The ratio of (A) to (B) is called the freezing hardness change rate: (
Figure DEST_PATH_IMAGE082
) (ii) a As shown in equation 14
Figure DEST_PATH_IMAGE084
（14）
The parameters obtained through a series of experiments and calculation determine the processing conditions (such as processing temperature and processing time) and the processing effect of the corresponding wood properties to make accurate evaluation.
The invention has the beneficial effects that:
1. improving wood anisotropy based on wood characteristics by classification, e.g. low density (density less than 0.5 g/cm)3) The wood is frozen by a freezing method; high relative density (high density)At 0.5g/cm3) The wood is subjected to hydrothermal treatment by a hydrothermal treatment method, and the quality of the veneer (veneer) can be effectively improved by classification treatment.
2. The direct evaluation method can avoid the influence of mechanical equipment, cutting parameters and cutters, evaluates the treatment effect of the wood, is beneficial to accurately determining the wood treatment conditions, and saves energy, manpower and material resources for wood section treatment; the production cost is reduced, and the enterprise benefit can be improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the present invention, each property of the wood is affected by the moisture content, and therefore, the state where the moisture content after the treatment reaches 12% in the national standard is defined as the measurement standard state, and this treatment process is called as the equilibrium treatment. The determination and classification of wood density is carried out after the equilibration treatment.
Example 1
Method for treating high-density wood
s1, manufacturing a test piece: poplar is adopted, the age of the poplar is 24-32 years, the diameter of the poplar is between 235 plus one year and 310mm, and the average water content of the raw wood is 89%;
selecting a poplar raw material with the average water content of 89% to manufacture a test piece, and performing water soaking and water saturation treatment after manufacturing a hardness test piece according to GB/T1929-2009 'Wood physical mechanics test material sawing and sample intercepting method', so as to prepare a water saturation test piece; determining the hardness of the cross section, the chord section and the radial section of the wood according to GB/T1941-2009 Wood hardness test method; a water-soaking and water-saturating treatment is carried out after a grain-following shear strength test piece is manufactured according to Japanese industrial standard | JISZ2101-1994 shear test method (8) of wood, and a water-saturating test piece is prepared.
s2 for densities above 0.5g/cm3The wood is subjected to soaking and boiling treatment by a hydrothermal treatment method; the calculation of the relevant parameters is performed according to the following definition requirements: during hydrothermal treatment, multiple groups of different soaking and boiling are setThe conditions of temperature and treatment time (such as treatment temperature of 40 deg.C, 50 deg.C, 60 deg.C, 70 deg.C, 80 deg.C; treatment time of 4h, 8h, 10h, 12h, etc.) are used as control groups to treat the wood.
National standard hardness value of cross section after treatment (
Figure 232965DEST_PATH_IMAGE004
) And cross section hardness value of water-saturated test piece (
Figure 31157DEST_PATH_IMAGE006
) The percentage of (A) is referred to as a reduction rate of cross-sectional hardness (
Figure 495636DEST_PATH_IMAGE008
) As shown in the following equation 1
Figure 430094DEST_PATH_IMAGE010
(1)
International hardness value of string section after treatment (
Figure 220196DEST_PATH_IMAGE012
) And hardness value of tangent plane of water-saturated test piece (
Figure 505684DEST_PATH_IMAGE014
) The percentage of (A) is referred to as the reduction rate of the hardness of the tangent plane (
Figure 508275DEST_PATH_IMAGE016
) As shown in the following equation 2
Figure 562818DEST_PATH_IMAGE018
(2)
International hardness value of diameter section after treatment (
Figure 523821DEST_PATH_IMAGE020
) And the radial section hardness value of the water-saturated test piece (
Figure 765447DEST_PATH_IMAGE022
) The percentage of (D) is called as a reduction rate (J) of the diametral cut surface hardness, as shown in the following equation 3
Figure 837308DEST_PATH_IMAGE024
（3）
Hardness value of tangent plane after treatment (
Figure 11937DEST_PATH_IMAGE012
) And the national standard hardness value of the cross section (
Figure 612683DEST_PATH_IMAGE004
) The percentage of (A) is referred to as the cross-sectional softening rate: (
Figure 872763DEST_PATH_IMAGE026
) As shown in the following equation 4
Figure 482736DEST_PATH_IMAGE028
（4）
International hardness value of diameter section after treatment (
Figure 508942DEST_PATH_IMAGE020
) Chord tangent plane hardness value
Figure 280589DEST_PATH_IMAGE012
) The percentage of (A) is referred to as the tangent softening rate (
Figure 27965DEST_PATH_IMAGE030
) As shown in the following equation 5
Figure 441629DEST_PATH_IMAGE032
（5）
Treated shear strength values (
Figure 325271DEST_PATH_IMAGE034
) And shear strength value of water-saturated test piece
Figure 533399DEST_PATH_IMAGE036
) The percentage of (A) is referred to as a shear strength reduction rate: (
Figure 502492DEST_PATH_IMAGE038
) As shown in equation 6
Figure 454267DEST_PATH_IMAGE040
（6）
The following respective values are referred to in the case of hydrothermal treatment: when the reduction rate of the cross section hardness is about 76 percent, and the reduction rates of the chord section hardness and the radial section hardness are about 81 percent; the softening rate of the cross section is about 96 percent, and the softening rate of the chord section is about 95 percent; the optimum treatment temperature is set when the shear strength reduction rate is about 90%.
s3 determining the treatment temperature
And determining the processing temperature according to the corresponding processing parameters calculated by the above defined formula.
s4 determining processing time
Determining the treatment time according to the radius of the specific wood segment, and determining the treatment time by adopting the hardness change speed of hydrothermal treatment and the hardness change speed of freezing treatment;
in the wood section hydrothermal treatment process, the time when the cross section hardness reduction value from the outer surface of the wood section to the random (respectively measuring the hardness of the edge wood and the core material) reaches the calculated value of the formula (1) is selected as the treatment time, and the radius of the wood section is (C), (B), (C), (D) and D)
Figure 192416DEST_PATH_IMAGE074
) And the time required (
Figure 571445DEST_PATH_IMAGE076
) The ratio of (A) to (B) is called the hydrothermal hardness change rate: (
Figure 762255DEST_PATH_IMAGE078
) (ii) a As shown in equation 13
Figure 517721DEST_PATH_IMAGE080
（13）
Through the series of experiments and calculation, the processing conditions and the processing effect corresponding to the wood properties can be directly and accurately evaluated, and the optimal processing conditions are determined.
Example 2
Method for treating low density wood
s1, manufacturing a test piece:
selecting a green wood with the water content higher than 80% to manufacture a test piece, and performing water soaking and water saturation treatment after manufacturing a hardness test piece according to GB/T1929-2009 'Wood physical mechanical test material sawing and sample intercepting method', so as to prepare a water saturation test piece; determining the hardness of the cross section, the chord section and the radial section of the wood according to GB/T1941-2009 Wood hardness test method; a water-soaking and water-saturating treatment is carried out after a grain-following shear strength test piece is manufactured according to Japanese industrial standard | JISZ2101-1994 shear test method (8) of wood, and a water-saturating test piece is prepared.
s2 for density lower than 0.5g/cm3The raw material is frozen, and relevant parameters are calculated according to the following definition requirements (if different groups of temperature and time conditions are set for freezing, such as-3 ℃, 6 ℃, 9 ℃ and 12 ℃, and processing time is 4h, 8h, 10h, 12h, and the like, different contrast groups are frozen, and the like): cross-sectional hardness value after treatment (
Figure 375956DEST_PATH_IMAGE042
) And cross section hardness value of water-saturated test piece (
Figure 925886DEST_PATH_IMAGE044
) The percentage of (A) is referred to as a cross-sectional hardness increase rate (
Figure 869571DEST_PATH_IMAGE046
) As shown in equation 7
Figure 163149DEST_PATH_IMAGE048
（7）
Hardness value of tangent plane after treatment (
Figure 610311DEST_PATH_IMAGE012
) And hardness value of tangent plane of water-saturated test piece (
Figure 596722DEST_PATH_IMAGE022
) The percentage of (A) is referred to as the rate of increase in the hardness of the tangent plane (
Figure 762124DEST_PATH_IMAGE050
) As shown in equation 8
Figure 862322DEST_PATH_IMAGE052
（8）
Hardness value of radial section after treatment (
Figure 429570DEST_PATH_IMAGE054
) And the radial section hardness value of the water-saturated test piece (
Figure 586882DEST_PATH_IMAGE056
) The percentage of (A) is referred to as the radial hardness increase rate (
Figure 239580DEST_PATH_IMAGE058
) As shown in equation 9
Figure 874961DEST_PATH_IMAGE060
（9）
Hardness value of tangent plane after treatment (
Figure 562294DEST_PATH_IMAGE012
) And cross-sectional hardness value
Figure 624928DEST_PATH_IMAGE042
) The percentage of (B) is referred to as the cross-sectional hardness change rate: (
Figure 764922DEST_PATH_IMAGE062
) As shown in equation 10
Figure 469573DEST_PATH_IMAGE064
（10）
Hardness value of radial section after treatment (
Figure 745834DEST_PATH_IMAGE054
) Chord tangent plane hardness value
Figure 244948DEST_PATH_IMAGE012
) The percentage of (A) is referred to as the chord section hardness change rate (
Figure 606659DEST_PATH_IMAGE066
) As shown in equation 11
Figure 583843DEST_PATH_IMAGE068
（11）
Treated shear strength values (
Figure 245768DEST_PATH_IMAGE034
) And shear strength value of water-saturated test piece
Figure 650205DEST_PATH_IMAGE036
) The percentage of (A) is referred to as the shear strength increase rate: (
Figure 764791DEST_PATH_IMAGE070
) As shown in formula (12)
Figure 545665DEST_PATH_IMAGE072
（12）
In the case of the freezing treatment, the following respective values are referred to: when the three-section hardness increase rate is about 109 percent, the cross-section hardness increase rate is about 115 percent, and the radial-section hardness increase rate is about 121 percent; the change rate of the cross section hardness is about 96 percent |; the hardness change rate of the tangent plane is about 98 percent; the shear strength increase rate is about 111%; is the optimum processing temperature.
s3 determining the treatment temperature
The treatment temperature of the wood is determined according to the corresponding treatment parameters calculated by the above defined formula.
s4 determining processing time
Determining the treatment time according to the radius of the specific wood segment, and determining the treatment time by adopting the hardness change speed of hydrothermal treatment and the hardness change speed of freezing treatment;
in the wood section freezing treatment process, the time from the outer surface of the wood section to the random (respectively measuring the edge wood and core material hardness) cross section hardness increase value to the calculated value of the formula (7) is selected as the treatment time, and the radius of the wood section is (C), (B), (C), (D) and D)
Figure 796518DEST_PATH_IMAGE074
) And the time required (
Figure 637435DEST_PATH_IMAGE076
) The ratio of (A) to (B) is called the freezing hardness change rate: (
Figure 259826DEST_PATH_IMAGE082
) (ii) a As shown in equation 14
Figure 578811DEST_PATH_IMAGE084
（14）
Through the series of experiments and calculation, the processing conditions and the processing effect corresponding to the wood performance can be directly and accurately evaluated. Selecting reasonable wood segment treatment conditions.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the above description within the technical scope of the present invention, the technical solutions and their concepts equally substituted or changed within the technical scope of the present invention.

Claims (3)

1. A method for determining the treatment conditions of a wood segment for cutting a veneer is characterized by comprising the following steps:
s1, manufacturing a test piece: selecting raw materials with the average water content of more than 80% to manufacture a test piece, manufacturing wood into a hardness test piece, and then performing water soaking and water saturation treatment to prepare a water saturation test piece; measuring the hardness of the cross section, the chord section and the radial section of the wood; after manufacturing a smooth-grain shear strength test piece, carrying out water soaking and water saturation treatment, and preparing a water saturation test piece;
s2, selecting a treatment method according to the wood characteristics:
determining the density of the wood of the corresponding species according to the existing data, and dividing the wood into two types of low-density wood and high-density wood, wherein under the conditions, the density of the wood is less than 0.5g/cm3 and is called low density, and the density of the wood is more than 0.5g/cm3 and is called high density;
selecting a hydrothermal treatment method for wood with the density of more than 0.5g/cm3, selecting a plurality of different treatment temperatures and treatment times at certain intervals, and carrying out hydrothermal treatment; the calculation of the relevant parameters is performed according to the following definition requirements:
national standard hardness value of cross section after treatment (
Figure 826685DEST_PATH_IMAGE001
) And cross section hardness value of water-saturated test piece (
Figure 359297DEST_PATH_IMAGE002
) The percentage of (A) is referred to as a reduction rate of cross-sectional hardness (
Figure 761460DEST_PATH_IMAGE003
) As shown in the following equation 1
Figure 56437DEST_PATH_IMAGE004
(1)
International hardness value of string section after treatment (
Figure 846539DEST_PATH_IMAGE005
) And hardness value of tangent plane of water-saturated test piece (
Figure 804130DEST_PATH_IMAGE006
) The percentage of (A) is referred to as the reduction rate of the hardness of the tangent plane (
Figure 931355DEST_PATH_IMAGE007
) As shown in the following equation 2
Figure 392424DEST_PATH_IMAGE008
(2)
International hardness value of diameter section after treatment (
Figure 773333DEST_PATH_IMAGE009
) And the radial section hardness value of the water-saturated test piece (
Figure 14958DEST_PATH_IMAGE010
) The percentage of (D) is called as a reduction rate (J) of the diametral cut surface hardness, as shown in the following equation 3
Figure 758924DEST_PATH_IMAGE011
（3）
Hardness value of tangent plane after treatment (
Figure 589345DEST_PATH_IMAGE005
) And the national standard hardness value of the cross section (
Figure 65457DEST_PATH_IMAGE001
) The percentage of (A) is referred to as the cross-sectional softening rate: (
Figure 748373DEST_PATH_IMAGE012
) As shown in the following equation 4
Figure 358346DEST_PATH_IMAGE013
（4）
International hardness value of diameter section after treatment (
Figure 262848DEST_PATH_IMAGE009
) Chord tangent plane hardness value
Figure 955867DEST_PATH_IMAGE005
) The percentage of (A) is referred to as the tangent softening rate (
Figure 703243DEST_PATH_IMAGE014
) As shown in the following equation 5
Figure 523431DEST_PATH_IMAGE015
（5）
Treated shear strength values (
Figure 770523DEST_PATH_IMAGE016
) And shear strength value of water-saturated test piece
Figure 916333DEST_PATH_IMAGE017
) The percentage of (A) is referred to as a shear strength reduction rate: (
Figure 619847DEST_PATH_IMAGE018
) As shown in equation 6
Figure 227415DEST_PATH_IMAGE019
（6）
The following respective values are referred to in the case of hydrothermal treatment: when the cross section hardness reduction rate is about 76%, the chord section and radial section hardness reduction rate is about 81%, the cross section softening rate is about 96%, the chord section softening rate is about 95%, and the shear strength reduction rate is about 90%, the optimal treatment temperature is set;
for densitySelecting a plurality of raw materials with different treatment temperatures and treatment times at certain intervals for freezing treatment, wherein the raw materials are less than 0.5g/cm3, and calculating related parameters according to the following definition requirements: cross-sectional hardness value after treatment (
Figure 903247DEST_PATH_IMAGE020
) And cross section hardness value of water-saturated test piece (
Figure 846057DEST_PATH_IMAGE021
) The percentage of (A) is referred to as a cross-sectional hardness increase rate (
Figure 692659DEST_PATH_IMAGE022
) As shown in equation 7
Figure 854650DEST_PATH_IMAGE023
（7）
Hardness value of tangent plane after treatment (
Figure 132792DEST_PATH_IMAGE005
) And hardness value of tangent plane of water-saturated test piece (
Figure 354826DEST_PATH_IMAGE010
) The percentage of (A) is referred to as the rate of increase in the hardness of the tangent plane (
Figure 32932DEST_PATH_IMAGE024
) As shown in equation 8
Figure 654406DEST_PATH_IMAGE025
（8）
Hardness value of radial section after treatment (
Figure 101568DEST_PATH_IMAGE026
) And the radial section hardness value of the water-saturated test piece (
Figure 510815DEST_PATH_IMAGE027
) The percentage of (A) is referred to as the radial hardness increase rate (
Figure 551583DEST_PATH_IMAGE028
) As shown in equation 9
Figure 570223DEST_PATH_IMAGE029
（9）
Hardness value of tangent plane after treatment (
Figure 871892DEST_PATH_IMAGE005
) And cross-sectional hardness value
Figure 701307DEST_PATH_IMAGE020
) The percentage of (B) is referred to as the cross-sectional hardness change rate: (
Figure 994753DEST_PATH_IMAGE030
) As shown in equation 10
Figure 36658DEST_PATH_IMAGE031
（10）
Hardness value of radial section after treatment (
Figure 379784DEST_PATH_IMAGE026
) Chord tangent plane hardness value
Figure 380101DEST_PATH_IMAGE005
) The percentage of (A) is referred to as the chord section hardness change rate (
Figure 677352DEST_PATH_IMAGE032
) As shown in equation 11
Figure 788527DEST_PATH_IMAGE033
（11）
Treated shear strength values (
Figure 658263DEST_PATH_IMAGE016
) And shear strength value of water-saturated test piece
Figure 514968DEST_PATH_IMAGE017
) The percentage of (A) is referred to as the shear strength increase rate: (
Figure 532471DEST_PATH_IMAGE034
) As shown in formula (12)
Figure 712917DEST_PATH_IMAGE035
（12）
In the case of the freezing treatment, the following respective values are referred to: when the three-section hardness increase rate is about 109 percent, the tangential section hardness increase rate is about 115 percent, the diametral section hardness increase rate is about 121 percent, the transverse section hardness change rate is about 96 percent, the tangential section hardness change rate is about 98 percent, and the shear strength increase rate is about 111 percent, the optimal treatment temperature is set;
s3 determining the treatment temperature
Determining the treatment temperature of the wood according to the corresponding treatment parameters calculated by the above defined formula;
s4 determining processing time
Determining the treatment time according to the radius of the specific wood segment, and determining the treatment time by adopting the hardness change speed of hydrothermal treatment and the hardness change speed of freezing treatment;
in the process of wood segment hydrothermal treatment, the time when the cross section hardness reduction rate value from the outer surface of the wood segment to the medullary heart reaches the calculated value of the formula (1) is selected as the treatment time, and the radius of the wood segment is (
Figure 859995DEST_PATH_IMAGE036
) And the time required (
Figure 627881DEST_PATH_IMAGE037
) The ratio of (A) to (B) is called the hydrothermal hardness change rate: (
Figure 273626DEST_PATH_IMAGE038
) (ii) a As shown in equation 13
Figure 8495DEST_PATH_IMAGE039
（13）
In the wood segment freezing treatment process, the time when the value of the cross section hardness increase from the outer surface of the wood segment to the medullary heart reaches the value calculated by the formula (7) is selected as the treatment time, and the radius of the wood segment is (
Figure 931451DEST_PATH_IMAGE036
) And the time required (
Figure 162582DEST_PATH_IMAGE037
) The ratio of (A) to (B) is called the freezing hardness change rate: (
Figure 590895DEST_PATH_IMAGE040
) (ii) a As shown in equation 14
Figure 316406DEST_PATH_IMAGE041
（14）
And realizing classification processing aiming at wood with different densities through the parameter characteristics, and obtaining directly processed parameter data.
2. The method of claim 1, wherein the wood density value is obtained by direct measurement.
3. A method for evaluating the classifying treatment effect of wood segments for cutting veneers is characterized by comprising the following steps: determining parameters of wood treatment through a series of experiments and calculations in a method for determining conditions for wood section treatment for veneer cutting according to claim 1; accordingly, the processing conditions and processing effects corresponding to the wood properties can be directly and accurately evaluated, and the optimal processing conditions can be determined.
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