CN105904561A - Machining method of special-shaped tenon structure - Google Patents
Machining method of special-shaped tenon structure Download PDFInfo
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- CN105904561A CN105904561A CN201610276887.6A CN201610276887A CN105904561A CN 105904561 A CN105904561 A CN 105904561A CN 201610276887 A CN201610276887 A CN 201610276887A CN 105904561 A CN105904561 A CN 105904561A
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- drying baker
- flitch
- tenon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
- B27K5/0055—Radio-waves, e.g. microwaves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2240/00—Purpose of the treatment
- B27K2240/20—Removing fungi, molds or insects
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a machining method of a special-shaped tenon structure. Through the steps of cutting molding, preheating, pre-drying, vacuum drying, cooling, tenon machining, staged soaking, secondary vacuum drying and molding, the moisture content of a special-shaped tenon can be reduced to be about 10% finally, and the drying and moisture removal effects can be achieved effectively. The special-shaped tenon subjected to drying treatment can be prevented from deforming and cracking in the machining and using processes, and has excellent structural strength. Particularly, a batten is preheated in hot water in the machining process, pores in the batten are filled, and then the whole batten is compact in structure; in the subsequent drying process, moisture in the batten can be removed from inside to outside, then the moisture in the batten is distributed in a stepped linear mode, the batten can integrate the advantages of strength and toughness, and the batten is firmer when in use. In the pre-drying step, microwave heating is utilized, and the batten can be preheated more thoroughly through the combination of the internal heating mode and the external heating mode.
Description
Technical field
The processing method that the present invention relates to a kind of carpenter's connection member, the processing method being specifically related to a kind of abnormity tenon structure.
Background technology
Tenon is ancient china building, furniture and the primary structure mode of other apparatus, is a kind of connected mode using concavo-convex position to combine on two components.Projection is tenon (or being tenon)；Recess is the fourth of the twelve Earthly Branches (or being mortise, tongue-and-groove).Wood the component tenon protruded above and the mortise fallen in, be engaged simply, just combined by wood component, owing to the form of connecting elements is different, thus derives Protean compound mode, makes furniture reach the perfect unity of function and structure.
Tradition joinery and its construction technology requires: tenon thickness is less than mortise width 0.1～0.2mm, when tenon thickness is more than mortise width owing to extruding causes glue to run off thus reduces bonding strength, the most easily makes mortise ftracture during assembling.Tenon width ratio mortise length big 0.5～1mm, hard material is 0.5mm, and soft material is 1mm.Length of tenon is than the mortise degree of depth little 2～3mm and more than the half of mortise part thickness.Tenon combines and uses basic hole system, and tenon thickness should be adjusted to bore, with square set, the size being consistent.
The drying of wood is a highly important operation in the timber course of processing, is the important step ensureing and improving wood quality.Pass through dried, it is possible to prevent timber strain cracking, improve physical property, improve timber utilization rate, prevent foxiness from damaging by worms.The most effectively it is dried means currently for single joinery and its construction, seriously limits the range of application of Tenon.And in prior art, there is serious seasoning defect drying defect in the timber for minor diameter, dry run easily produces gross distortion and cross shake, the problem that tenon structure exists dry difficulty, yield rate is low especially for hard wooden, therefore, dry mass directly affects the structural stability of the product processed by tenon structure.
Summary of the invention
The processing method that it is an object of the invention to provide a kind of abnormity tenon structure, carries out effectively being dried processing for abnormity tenon structure, prevents abnormity tenon from deforming and cross shake in processing and use.
For reaching above-mentioned purpose, the technical scheme is that the processing method of a kind of abnormity tenon structure comprises the following steps:
The first step, excision forming, is processed into the flitch that cross section is rectangle by timber；
Second step, preheating, flitch is positioned in the hot water of 45～55 DEG C, soaks 1～2 hour；
3rd step, predrying, flitch is taken out from hot water, dries the moisture content on surface, be placed in drying baker, the ambient temperature in drying baker is risen to 60～65 DEG C, the ambient humidity in regulation drying baker, to 15～17%, keeps 1～2 hour；Being aided with microwave heating, the frequency of microwave is 890～940MHz simultaneously, and microwave heating is spaced 10 seconds after often continuing 2 seconds；
4th step, vacuum drying, the ambient temperature in drying baker is risen between 90～140 DEG C, the absolute pressure in drying baker is controlled 0.01～0.08Mpa, keep 1～2 hour；
5th step, is down to 55～60 DEG C by the ambient temperature in drying baker, and ambient humidity is down to 9～11%, and keeps 1～2 hour；
6th step, cooling, the ambient temperature in drying baker is down to 25～30 DEG C, ambient humidity is down to 7～8%, keeps 1～2 hour；
7th step, is processed tenon, is processed the tenon of two sides of flitch by timber processing apparatus；
8th step, stage immersion, the flitch being machined with tenon is positioned in the hot water of 45～55 DEG C, soaks 0.5～1 hour；
9th step, secondary vacuum is dried, flitch is taken out from hot water, dry the moisture content on surface, the surrounding of flitch being compressed by pressing plate, be placed in drying baker, the ambient temperature in drying baker rises between 90～140 DEG C, absolute pressure in drying baker is controlled 0.01～0.08Mpa, keep 1～2 hour；
Tenth step, molding, flitch is taken out in drying baker, removes pressing plate, obtain finished product.
When using technique scheme, finally the moisture content of abnormity tenon can be dropped to about 10%, it is possible to effectively play and be dried the effect except water.Special-shaped tenon through dried, it is possible to prevent from deforming and ftractureing in processing and use, have good structural strength.Concrete, flitch is particularly placed and is preheated in the hot water by work in-process, on the one hand can heat up follow-up being dried of flitch, furthermore, soak flitch in the hot water, it is possible to volumetric expansion after being heated and soaking, the hole in flitch is filled up, the structure making whole flitch is full, in follow-up being dried, it is possible to the moisture content in flitch is from inside to outside removed so that the moisture content in flitch is ladder linear distribution, the advantage that can simultaneously take into account intensity and toughness, more firm during use.Additionally, in pre-drying step, microwave heating has been arrived in use, microwave heating is heating in one, it is different from the external heating mode during traditional timber processes, combines the two ways of interior external heat, it is possible to be more thorough to flitch preheating, the inside and outside moisture content preventing flitch has big difference, and causes the problem that flitch ftractures.
Improvement project, in described 9th step, is aided with microwave heating simultaneously further, and the frequency of microwave is 890～940MHz, is spaced 10～15 second after often continuing 2 seconds during microwave heating.In secondary vacuum is dried, the microwave heating of utilization is heating in one, is different from the external heating mode during traditional timber processes, combine the two ways of interior external heat, can be more thorough to flitch preheating, prevent the inside and outside moisture content of flitch from having big difference, cause the problem that flitch ftractures.
Improvement project further, in the described first step, the sectional dimension of flitch is 70 × 80mm, a length of 170mm.
Further improvement project, in described 4th step, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C.
Further improvement project, in described 9th step, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C.In above-mentioned two step, the ambient temperature programming rate in drying baker is slower, on the one hand, can be heated up by slow, eliminate as much as the temperature difference inside and outside flitch, place in heating process and deform.Furthermore, slow intensification can extend whole heating process, it is to avoid is in for a long time in limit high temperature by flitch in traditional drying, causes the moisture content within flitch effectively not exchange, cause occurring moisture content tomography in flitch, causes the intensity of flitch to decline, easy to crack.
Improvement project further, pressing plate is locked by bolt.
Improvement project, in described 9th step, is down to 7～8% by the ambient humidity in drying baker further.By effectively controlling the measure of ambient humidity, this setting can guarantee that the finished product moisture content of final molding is up to standard.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings:
Fig. 1 is the structural representation of abnormity tenon of the present invention；
Fig. 2 is the side-looking structural representation of Fig. 1；
Fig. 3 is the plan structure schematic diagram of Fig. 1.
Detailed description of the invention
Embodiment 1
The first step, excision forming, timber is sawn into the flitch that cross section is rectangle；The sectional dimension of flitch is 70 × 80mm, a length of 170mm；
Second step, preheating, flitch is positioned in the hot water of 45～55 DEG C, soaks 1～2 hour, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
3rd step, predrying, flitch is taken out from hot water, dries the moisture content on surface, be placed in drying baker, the ambient temperature in drying baker is risen to 60～65 DEG C, the ambient humidity in regulation drying baker, to 15～17%, keeps 1～2 hour；Being aided with microwave heating, the frequency of microwave is 890～940MHz simultaneously, and microwave heating is spaced 10 seconds after often continuing 2 seconds；
4th step, vacuum drying, the ambient temperature in drying baker is risen between 90～140 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, the absolute pressure in drying baker is controlled 0.01～0.08Mpa, keeps 1～2 hour；
5th step, is down to 55～60 DEG C by the ambient temperature in drying baker, and ambient humidity is down to 9～11%, and keeps 1～2 hour；
6th step, cooling, the ambient temperature in drying baker is down to 25～30 DEG C, ambient humidity is down to 7～8%, keeps 1～2 hour；
7th step, is processed tenon, is processed the tenon of two sides of flitch by timber processing apparatus；
8th step, stage immersion, the flitch being machined with tenon is positioned in the hot water of 45～55 DEG C, soaks 0.5～1 hour, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
9th step, secondary vacuum is dried, and is taken out by flitch from hot water, dries the moisture content on surface, the surrounding of flitch is compressed by pressing plate, pressing plate is locked by bolt, is placed in drying baker, and the ambient temperature in drying baker rises between 90～140 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, absolute pressure in drying baker is controlled 0.01～0.08Mpa, the ambient humidity in drying baker is down to 7～8%, keep 1～2 hour；Being aided with microwave heating, the frequency of microwave is 890～940MHz simultaneously, is spaced 10～15 second after often continuing 2 seconds during microwave heating；
Tenth step, molding, flitch is taken out in drying baker, removes pressing plate, obtain finished product.
Embodiment 2
Embodiment 1
The first step, excision forming, timber is sawn into the flitch that cross section is rectangle；The sectional dimension of flitch is 70 × 80mm, a length of 170mm；
Second step, preheating, flitch is positioned in the hot water of 50 DEG C, soaks 1.5 hours, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
3rd step, predrying, flitch is taken out from hot water, dries the moisture content on surface, be placed in drying baker, the ambient temperature in drying baker is risen to 60 DEG C, the ambient humidity in regulation drying baker, to 16%, keeps 1.5 hours；Being aided with microwave heating, the frequency of microwave is 920MHz simultaneously, and microwave heating is spaced 10 seconds after often continuing 2 seconds；
4th step, vacuum drying, the ambient temperature in drying baker is risen between 120 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, the absolute pressure in drying baker is controlled at 0.05Mpa, keeps 1.5 hours；
5th step, is down to 55 DEG C by the ambient temperature in drying baker, and ambient humidity is down to 10%, and keeps 1.5 hours；
6th step, cooling, the ambient temperature in drying baker is down to 25 DEG C, ambient humidity is down to 7%, keeps 1.5 hours；
7th step, is processed tenon, is processed the tenon of two sides of flitch by timber processing apparatus；
8th step, stage immersion, the flitch being machined with tenon is positioned in the hot water of 50 DEG C, soaks 1 hour, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
9th step, secondary vacuum is dried, and is taken out by flitch from hot water, dries the moisture content on surface, the surrounding of flitch is compressed by pressing plate, pressing plate is locked by bolt, is placed in drying baker, and the ambient temperature in drying baker rises between 120 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, absolute pressure in drying baker is controlled at 0.05Mpa, the ambient humidity in drying baker is down to 7%, keep 1.5 hours；Being aided with microwave heating, the frequency of microwave is 920MHz simultaneously, is spaced 12 second after often continuing 2 seconds during microwave heating；
Tenth step, molding, flitch is taken out in drying baker, removes pressing plate, obtain finished product.
Embodiment 3
The first step, excision forming, timber is sawn into the flitch that cross section is rectangle；The sectional dimension of flitch is 70 × 80mm, a length of 170mm；
Second step, preheating, flitch is positioned in the hot water of 55 DEG C, soaks 1 hour, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
3rd step, predrying, flitch is taken out from hot water, dries the moisture content on surface, be placed in drying baker, the ambient temperature in drying baker is risen to 65 DEG C, the ambient humidity in regulation drying baker, to 15%, keeps 1 hour；Being aided with microwave heating, the frequency of microwave is 940MHz simultaneously, and microwave heating is spaced 10 seconds after often continuing 2 seconds；
4th step, vacuum drying, the ambient temperature in drying baker is risen between 140 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, the absolute pressure in drying baker is controlled at 0.01Mpa, keeps 1 hour；
5th step, is down to 60 DEG C by the ambient temperature in drying baker, and ambient humidity is down to 9%, and keeps 1 hour；
6th step, cooling, the ambient temperature in drying baker is down to 25 DEG C, ambient humidity is down to 7%, keeps 1 hour；
7th step, is processed tenon, is processed the tenon of two sides of flitch by timber processing apparatus；
8th step, stage immersion, the flitch being machined with tenon is positioned in the hot water of 55 DEG C, soaks 0.5 hour, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
9th step, secondary vacuum is dried, and is taken out by flitch from hot water, dries the moisture content on surface, the surrounding of flitch is compressed by pressing plate, pressing plate is locked by bolt, is placed in drying baker, and the ambient temperature in drying baker rises between 140 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, absolute pressure in drying baker is controlled at 0.01Mpa, the ambient humidity in drying baker is down to 7%, keep 1 hour；Being aided with microwave heating, the frequency of microwave is 940MHz simultaneously, is spaced 10 second after often continuing 2 seconds during microwave heating；
Tenth step, molding, flitch is taken out in drying baker, removes pressing plate, obtain finished product.
Embodiment 4
The first step, excision forming, timber is sawn into the flitch that cross section is rectangle；The sectional dimension of flitch is 70 × 80mm, a length of 170mm；
Second step, preheating, flitch is positioned in the hot water of 45 DEG C, soaks 2 hours, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
3rd step, predrying, flitch is taken out from hot water, dries the moisture content on surface, be placed in drying baker, the ambient temperature in drying baker is risen to 60 DEG C, the ambient humidity in regulation drying baker, to 15%, keeps 2 hours；Being aided with microwave heating, the frequency of microwave is 890MHz simultaneously, and microwave heating is spaced 10 seconds after often continuing 2 seconds；
4th step, vacuum drying, the ambient temperature in drying baker is risen between 90 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, the absolute pressure in drying baker is controlled at 0.08Mpa, keeps 2 hours；
5th step, is down to 55 DEG C by the ambient temperature in drying baker, and ambient humidity is down to 11%, and keeps 2 hours；
6th step, cooling, the ambient temperature in drying baker is down to 30 DEG C, ambient humidity is down to 8%, keeps 2 hours；
7th step, is processed tenon, is processed the tenon of two sides of flitch by timber processing apparatus；
8th step, stage immersion, the flitch being machined with tenon is positioned in the hot water of 45 DEG C, soaks 1 hour, it is possible to use flitch is completely immersed in water by the auxiliaries such as pressing plate；
9th step, secondary vacuum is dried, and is taken out by flitch from hot water, dries the moisture content on surface, the surrounding of flitch is compressed by pressing plate, pressing plate is locked by bolt, is placed in drying baker, and the ambient temperature in drying baker rises between 90 DEG C, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C, absolute pressure in drying baker is controlled at 0.08Mpa, the ambient humidity in drying baker is down to 8%, keep 2 hours；Being aided with microwave heating, the frequency of microwave is 890MHz simultaneously, is spaced 15 second after often continuing 2 seconds during microwave heating；
Tenth step, molding, flitch is taken out in drying baker, removes pressing plate, obtain finished product.
Above-described is only the preferred embodiment of the present invention; should be understood that; for a person skilled in the art; without departing from the inventive concept of the premise; some deformation and improvement can also be made; these also should be considered as protection scope of the present invention, and these are all without affecting effect and the practical applicability that the present invention implements.The technology of the omitted description of the present invention, shape, structure part are known technology.
Claims (7)
1. a processing method for special-shaped tenon structure, is characterized in that, comprises the following steps:
The first step, excision forming, is processed into the flitch that cross section is rectangle by timber；
Second step, preheating, flitch is positioned in the hot water of 45～55 DEG C, soaks 1～2 hour；
3rd step, predrying, flitch is taken out from hot water, dries the moisture content on surface, be placed in drying baker, the ambient temperature in drying baker is risen to 60～65 DEG C, the ambient humidity in regulation drying baker, to 15～17%, keeps 1～2 hour；Being aided with microwave heating, the frequency of microwave is 890～940MHz simultaneously, and microwave heating is spaced 10 seconds after often continuing 2 seconds；
4th step, vacuum drying, the ambient temperature in drying baker is risen between 90～140 DEG C, the absolute pressure in drying baker is controlled 0.01～0.08Mpa, keep 1～2 hour；
5th step, is down to 55～60 DEG C by the ambient temperature in drying baker, and ambient humidity is down to 9～11%, and keeps 1～2 hour；
6th step, cooling, the ambient temperature in drying baker is down to 25～30 DEG C, ambient humidity is down to 7～8%, keeps 1～2 hour；
7th step, is processed tenon, is processed the tenon of two sides of flitch by timber processing apparatus；
8th step, stage immersion, the flitch being machined with tenon is positioned in the hot water of 45～55 DEG C, soaks 0.5～1 hour；
9th step, secondary vacuum is dried, flitch is taken out from hot water, dry the moisture content on surface, the surrounding of flitch being compressed by pressing plate, be placed in drying baker, the ambient temperature in drying baker rises between 90～140 DEG C, absolute pressure in drying baker is controlled 0.01～0.08Mpa, keep 1～2 hour；
Tenth step, molding, flitch is taken out in drying baker, removes pressing plate, obtain finished product.
The processing method of a kind of abnormity tenon structure the most according to claim 1, is characterized in that, in described 9th step, being aided with microwave heating, the frequency of microwave is 890～940MHz simultaneously, is spaced 10～15 second after often continuing 2 seconds during microwave heating.
The processing method of a kind of abnormity tenon structure the most according to claim 1, is characterized in that, in the described first step, the sectional dimension of flitch is 70 × 80mm, a length of 170mm.
The processing method of a kind of abnormity tenon structure the most according to claim 1, is characterized in that, in described 4th step, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C.
5. according to the processing method of a kind of abnormity tenon structure described in claim 1 or 4, it is characterized in that, in described 9th step, ambient temperature programming rate in drying baker is per minute is less than 2 DEG C.
The processing method of a kind of abnormity tenon structure the most according to claim 1, is characterized in that, in described 9th step, pressing plate is locked by bolt.
The processing method of a kind of abnormity tenon structure the most according to claim 1, is characterized in that, in described 9th step, the ambient humidity in drying baker is down to 7～8%.
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| CN201610276887.6A CN105904561A (en) | 2016-04-29 | 2016-04-29 | Machining method of special-shaped tenon structure |
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| CN106393342A (en) * | 2016-09-28 | 2017-02-15 | 玉溪加宝生物能源有限公司 | Drying method for wood |
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Cited By (3)
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| CN106393342A (en) * | 2016-09-28 | 2017-02-15 | 玉溪加宝生物能源有限公司 | Drying method for wood |
| WO2018214248A1 (en) * | 2017-05-26 | 2018-11-29 | 久盛地板有限公司 | Wood microwave vacuum drying process for solid wood ground heating floor |
| CN109707708A (en) * | 2019-01-04 | 2019-05-03 | 中南林业科技大学 | A glue-free prestressed joint method for inserting tenon joints of furniture and building components |
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