JPS63147756A - Lubricating method for tainter clip drive chain - Google Patents

Abstract

PURPOSE:To improve wear resistance and prevent galling from occurring by using, for the lubrication of a drive-chain, lubricating oil of a high withstand- load capacity at a time of a 'break-in' or 'take-to' operation and using lubricating oil of a high temperature-stability quality after finishing the 'break-in' operation. CONSTITUTION:Lubricating oil A is used at a time of a 'break-in' operation, and after shifting to a production operation, lubrication oil B is used. Lubricating oil A is classified as the one which is made to be lower in kinematic viscosity than lubricating oil B and whose fluidity and permeatability are made to better under a hot wind of comparatively low temperature and in addition, whose withstand-load capacity and frictional coefficient are made to improve through being combined with the extreme pressure additive of an organic molybdenum strain. As above, by using two different oil, lubricating oil A for the 'break-in' operation and lubricating oil B for the production operation, the occurrence of galling at as time of the 'break-in' operation is almost prevented, and also the wear resistance at a time of the production operation is improved due to a specular frictional surface being formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method for lubricating a tenter clip drive chain that runs under high temperature and high load in a transverse stretching machine that stretches a film or sheet in the width direction.

[Prior Art] Conventional lubrication methods use one type of lubricating oil that is stable at high temperatures both during break-in operation of a new chain and during production operation. However, the friction surfaces of the connecting pins and chain links of the tenter clip drive chain were in a fairly rough state with surface roughness of 2 to 4S, and the oil film was easily broken during break-in, causing adhesive wear accompanied by galling. If the chain tension is set low here, adhesive wear will be less likely to occur, but the break-in operation time will be longer. Furthermore, if production operation is started with incomplete break-in operation and a high load is applied, adhesive wear will occur, shortening the life of the connecting pin and thus the tenter clip drive chain. In addition, the greater the wear, the greater the driving power.

[Objective of the Invention] The present invention has been made from this point of view, and its purpose is to form a mirror surface on the worn surface without causing adhesive wear, thereby increasing the substantial contact area, and reducing wear. An object of the present invention is to provide a method for lubricating a tenter clip drive chain that reduces driving power.

[Summary of the Invention] The method for lubricating a tenter clip drive chain in the present invention is to use a lubricating oil with high load carrying capacity during break-in or break-in operation of a new drive chain. After the operation is completed, the lubricant is switched to a lubricant with good high temperature stability and production operation begins.

[Embodiments of the Invention] Two types of lubricating oils A and B used in a break-in operation and a production operation will be described below as an example of the present invention.

Table 1 Load-bearing capacity was measured based on the JIS K2519ftl lubricant load-bearing capacity test using a 4-ball friction tester by the 4-day 4-ball method.

The friction coefficient was measured using a Soda pendulum type oil tester.

As shown in Table 1, lubricating oil A for break-in operation has a lower kinematic viscosity than lubricating oil B for production operation, so that the fluidity and permeability of the lubricating oil are improved under relatively low-temperature hot air. Furthermore, by incorporating organic molybdenum-based extreme pressure additives, the load carrying capacity and wear coefficient were improved.

Here, using lubricant A for break-in operation according to the present invention and lubricant oil B for production operation described in the conventional example, the number of clips is 2.
The break-in operation status was confirmed on 30 test machines. The break-in operating conditions are hot air temperature 80℃ and chain running speed 1.
00 m/min fist chain tension 350Kg/
The running time is 200 hours and the amount of oil supplied is 5 cc/h.

Table 2 In Table 2, in the case of lubricating oil A, galling occurred locally, but in the case of lubricating oil B, galling occurred almost over the entire friction surface in some cases. Furthermore, both lubricating oils had a mirror-like friction surface with no galling and a surface roughness of about 0.35.

[Effects of the Invention] As explained above, the method of lubricating the tenter clip drive chain according to the present invention uses different lubricating oils for break-in operation and production operation, which is particularly prone to adhesive wear accompanied by galling. Since galling is almost prevented from occurring during break-in operation, and a mirror-like friction surface is formed, wear resistance during production operation is improved and chain drive power is reduced.

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Claims (1)

[Claims] When lubricating a tenter clip drive chain, use a lubricant with high load capacity during break-in or breaking-in of a new drive chain, and after break-in, switch to a lubricant with good high temperature stability before production operation. A method of lubricating a tenter clip drive chain characterized by: