SU1728694A1 - Method of testing of water-tightness of watches - Google Patents

Abstract

The invention relates to metrology and permits an increase in the sensitivity and reliability of the control by reducing the influence of the ambient temperature. When checking clocks for condensation, they are placed in a heating chamber and heated to a fixed temperature of 45-50 ° C. Then the watch is taken out of the heating cabinet and the heated glass is cooled, washing the predetermined area of the watch glass with water in front of it, the dial is turned down. The area of the washed glass has the shape of a circle, the axis of which coincides with the axis of the arrows. The area of glass to be cooled is set in the range of 0.2-1.0 cm2. The washing of a certain part of the glass is carried out by an even flow of water with a strictly fixed temperature of 5-35 ° C. The cooling temperature of the condensation test prior to keeping the clock in water is chosen 2-5 ° C below the temperature of the cooling water after keeping the clock in water. 4 hp ff, 2 ill. . (Ls

Description

The invention relates to metrology and can be used in the watch industry in the manufacture of waterproof watches.

There is a known method for controlling the water resistance of a watch by checking the clock for condensation by heating the clock to a temperature within 40-45 ° C, cooling the heated glass with water at 18-25 ° C for one minute and fixing the presence or absence of condensation moisture on the glass, immersing the clock in water to a certain depth for a fixed period of time, re-checking the clock for condensation through similar operations.

The disadvantages of the method are low sensitivity and reliability, due to the inability to achieve

The inner surface of the cooled portion of the glass has temperatures that provide condensation moisture for any amount of moisture contained in the watch, as well as the influence of the ambient temperature.

The aim of the invention is to increase sensitivity and reliability by reducing the effect of ambient temperature.

The goal is achieved by the fact that during the condensation check process, the clock is heated to a fixed temperature, which is chosen from the range of 45-50 ° C, and the glass is cooled by flushing a portion of glass in the shape of a circle with water, the axis of which coincides with the axis of the arrows. , with an atom, the area of the cooled portion

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the glasses are chosen from a limit of 0.2-1.0 cm, the temperature of the water is in the range of 5-35 ° C, and the temperature of the cooling water when checking for condensate before keeping the hours in water is 2-5 ° C below the temperature of the cooling water after keeping hours in the water.

The essence of the invention is as follows.

When checking clocks for condensation, the clocks are placed in a heating chamber where they are heated to a certain temperature selected from the limit of 45-50 ° C. Then, the hours heated to the required temperature are taken out from the heating cabinet and the heated glass is cooled by washing the water in front of a predetermined specific area of the clock glass, turned with the dial downwards. The area of the washed glass has the shape of a circle, the axis of which coincides with the axis of the arrows.

The area of the glass to be cooled is set within 0.20-1.0 cm. With a decrease in the area of the glass to be cooled, on the one hand, the sensitivity and reliability of the control increases, and on the other hand, this is due to the need to ensure that the presence of condensation moisture on the inner surface is objectively fixed. glasses of relatively small size.

When flushing, the temperature on the inner surface of the cooled portion of glass is set to the temperature of the cooled water. Flushing of a certain part of the glass is carried out by a uniform stream of water with a strictly fixed temperature, chosen from the range of 5-35 ° C. This range provides overlap of all the dew point values of the ambient air for any time of year. Consequently, depending on the concentration of moisture in the ambient air, at which the waterproof watch is assembled, it is possible to choose a cooling water temperature when the condensation moisture is not covered during the pre-test for condensation.

When testing for condensation after testing hours in the aquatic environment, the appearance of condensation moisture deposits indicates that water has penetrated into the watch during the tests and the clock is rejected, and the absence of the coating indicates the suitability of the watch. When the glass is cooled by washing, the duration of the transition process of the establishment on the inner surface of the cooled portion of the glass is significantly reduced.

cooling water temperatures. In this case, the cooling time can be reduced while maintaining a reliable margin of up to 30 seconds. To eliminate the influence

the measurement errors of the cooling water temperature, the heating temperature of the clock in the heating chamber, the ambient temperature, the cooling water temperature is required when checking for condensation to

keeping the clock in water choose 2-5 ° C below the temperature of the cooling water after keeping the clock in water.

1 shows a diagram of the device for implementing the method; figure 2 - tube

to set the clock.

The device contains a vessel 1 into which water is poured at a strictly fixed temperature in the range of 5-35 ° C. The vessel 1 is connected to the tube by means of a hose 2.

3, on which the controlled clock 4 is mounted on the dial down. The base of the tube 3 on which the clock is mounted, has a profile of rectangular teeth through the slots between which water flows,

coming up from the bottom through the internal hollow channel.

The tube 3 is hermetically secured to the bottom of a cylindrical cup 5 having an outlet nozzle 6 for draining the water flowing out of the tube 3 during the washing of the glass for 1, Boiler 5 with a ring

7can move up and down on the stand 8. In the initial state, the cup 5 is fastened with the screw 9 on the tripod 8 at such a height that the base of the tube 3 is higher than the water level in the jar 1.

In this case, the process of washing the watch glass is absent. At the bottom of the tripod 8

A screw 10 is fixed by means of a screw 9, by means of which the lower position of the base of the tube 3 relative to the water level in the vessel 1 is set during the washing of the watch glass.

The device works as follows.

The clock is mounted on the base of the tube 3. Then the screw 9 of the ring 7 is loosened, and the glass 5 together with the tube 3 with the clock 4

descends down the tripod 8 up to the stop 10. In the lower position of the glass 5, the glass of the clock 4 is washed. After the cooling time has expired, the glass 5 returns to its initial upper position. Clock 4

Claims (5)

1. A method for controlling the water tightness of a clock by checking the clock for condensation by heating the clock and cooling the heated glass of the clock with water and fixing the presence or absence of condensation moisture on the glass, keeping the clock for a fixed period of time in water at a certain depth, retesting for condensation through similar operations characterized in that, in order to increase sensitivity and reliability by reducing the influence of the ambient temperature, the heating of the clock is carried out to at a fixed temperature, the glass is cooled by flushing with a stream of water a section of glass that has the shape of a circle, the axis of which coincides with the axis of the arrows. 0 five 2. The method according to claim 1. different in that. that a fixed temperature is chosen from the range of 45-50 ° C. 3. A method according to claim 1, characterized in that the area of the glass to be cooled is in the range of 0.2-1.0 cm. 4. A method according to claim 1, characterized in that the water temperature is selected from the range of 5-35 ° C. 5. The method according to claim 1, wherein that the temperature of the cooling water when testing for condensate before keeping the clock in water is chosen 2-5 ° C below the temperature of the cooling water after keeping the clock in water.