DE1750825A1 - Process for the production of compressed wood elements for self-lubricating slide bearings - Google Patents

Description

DR. EULE DR. BERG DIPL.-ING. STAPF

8 MUNICH 2nd HILBLESTRA8SE

Dr. Owl dr Berg Dipl.-Ing. Stopf, S MOnchtn 2, HilblwtrgCe 20 Our sign date

W / Öd 17 391 ι ₇ , Ju _n ,

Lawyer file no. 17 591

INSTYTUT TEGHNOLOGII DREWNA Posnan / Poland.

"Process for the production of compressed wood elements for self-lubricating slide bearings".

Dipl »-Ing.Zdzlslaw Chudzinski, Inventor: Dipl.-Ing. Lech Graj,

Dipl.-Ing.Zbigniew Rudnicki and Doc.Ing. Marian Wnuk.

The invention relates to a method for the production of pressed solid wood elements for self-lubricating Bearings.

109815/0649

Up to now, sliding bearings made of non-ferrous metals or other alloys have been used in various machines and facilities used. The following can be used as substitutes: modified Elsenform casting, plastics or pressed slaughtered wood (Lignofol) and even solid wood. Such bearings require constant lubrication during operation. This This circumstance causes significant construction difficulties, especially in the case of a required, dust-tight design. In addition, e.g. Lignofol is for Plain bearings fully impregnated with Bakelite resins, which in some cases can cause damage to the machine construction units. Solid wood, on the other hand, becomes Manufacture of slightly compressive plain bearings used, preferably for bearings that are at low Speed work. The durability of these camps is, however, due to changes in humidity and temperature Cause shrinkage cracks, insufficient.

Lately, solid wood manufactured in the following way has been used to manufacture plain bearings:

a) tailor-made boards were made

b) plasticized, c) designed in the correct shape, d) dried the moldings in hot air, e) cooled to about 20 ° C., f) by cutting until the desired one is reached Dimensions machined and g) soaked with lubricating oil before or after this machining.

109815 / 06A9 " ³ ~

Most often, the pressed solid wood elements for the production of slide bearings are manufactured in four different processes. According to the first process, the wood to be processed is plasticized by contact heating or steaming before it is deformed. The then correspondingly shaped and the pressed molded bodies are then cooled and dried in hot air in an air stream until about 2O ⁰ C. After a subsequent machining process, they are impregnated with oil. The second process differs from the one just described in that, at the beginning, freshly juiced wood is dried in melted bariso1 mud and then treated as in the first process. After the third process, the solid wood to be processed is plasticized in hot oil, after the fourth in cold ammonia solution.

All mentioned processes for the production of pressed solid wood elements for self-lubricating plain bearings differ from each other only in the How the wood is plastified before it is deformed into a bearing element, which is then dried Hot air, cooling, machining and impregnation with lubricating oil.

* ■ 4- **

109815/0649

However, either of these methods usually cracks and cracks during hot air drying also does not prevent significant shrinkage losses, which ultimately adversely affect the yield of the raw material and the masohine performance. The watering of the pressed solid wood in a separate operation also increases the workload.

The method according to the invention for the production of pressed solid wood elements for self-lubricating slide bearings enables the degree of utilization of both the raw material and the also to increase the means of production used and to reduce the labor and time expenditure significantly. To Pressed solid wood produced using the new process is characterized by better lubricity in the plain bearing compared to anything produced using the previous process the end.

The new process for the production of pressed solid wood elements for plain bearings includes the following operations:

a) cutting boards to size,

b) plastification of the same by moistening to above the fiber saturation point or by steaming,

c) Deformation and compression by pressing the boards to form plain bearing elements, d) Stabilization of the shape

with simultaneous drying and impregnation of the moldings with lubricating oil,

109815/0649 _{m 5 m}

The shape stabilization of the pressed solid wood elements for Plain bearing takes place during drying in hot lubricating oil, penetrates instead of evaporating water Oil into the voids of the wood structure. This condition counteracts sudden deformations of the plain bearing bushes and gives them the ability to self-lubricate.

The machine finishing of the according to the invention sliding bearing elements produced according to the method is limited to a fine machining of the sliding surface by grinding out. The adaptation of the circular circumferential surface to the housing is carried out by covering it with a corresponding layer of plastic resistant to lubricating oil or by machining. A plastic lining is required for plain bearing bushes that consist of several elements (segments) particularly suitable.

Compared to the previous process, the present process has the technical and economic advantage that it combines three separate operations, namely drying, cooling and impregnation with oil in one operation of simultaneous impregnation, drying and form stabilization in the lubricating oil »

Pat ent ans prücheι

10981S / 0649

Often INSPECTED

Claims (4)

Patent claims: 1. A process for the production of pressed solid wood elements for self-lubricating plain bearings - deformed and dimensionally processed in an otherwise known manner - characterized in that the impregnation with hot oil, drying and shape and dimensional stabilization take place at the same time. * 2. The method according to claim 1, characterized in that depending on the working parameters of the plain bearing for Soaking, drying and dimensional stabilization wrap Appropriately selected types of lubricating oil can be used pure or mixed. 3. The method according to claim 1, characterized in that solid wood with a moisture content above the Fiber saturation point is formed into plain bearing elements, 4. The method according to claim 1, 2 and 3, characterized in that that the shape and dimension stabilized slide bearing elements in an otherwise known way machined by cutting or their circumferential surfaces adapted to the housing by means of a plastic coating will. ORIGINAL INSPECTED 109815/0649