JPS63127834A - Manufacture of mount member for optical equipment - Google Patents

Abstract

PURPOSE:To shorten the working time by cutting the surface including a surface having a fine hole after fixing the first and second mount members and execut ing dimension setting and then allowing oil to be introduced into the fine hole on the mount member. CONSTITUTION:As for a mount ring 1 which is press-worked, a fine hole 15 is formed at the slidable part between an opponent mount through the laser or electron beam method. After the cutting work, the hole is allowed to contain lubricating oil, and the superior mounting durability is provided. The lubricating oil oozes out to the mount surface by the acceleration of the capillary tube phenomenon by the generation of local heat or the negative pressure suction action through the mounting/demounting sliding of the mount. Therefore, a rolled plate which is inexpensive in comparison with the material made from sintering can be used, and cutting is performed sufficiently by only one chuck operation by using an NC lathe in the posterior cutting process.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an optical device that dramatically improves sliding durability through the lubrication effect generated when oil present in minute holes seeps onto the mount surface. This relates to a mount member.

[Prior Art] Conventionally, each time a mount member of an optical device is attached or detached from a lens mount, etc., the mount surface is worn out due to direct contact between metals.
The sintered oil-impregnated stainless acid mount described in Publication No. 7 was used.

[Problem that the invention seeks to solve] However,
Since the above conventional example uses a stainless steel sintered material, the tensile strength is only 25 kg-f/■2 elongation 5%, and the stainless steel cold rolled material used in the present invention is guaranteed to have a tensile strength of only 53 kg.
g-f/mII! 2.40%, for example, when an impact force was applied to the bayonet claw, the claw could break off. In addition, the production of stainless steel sintered materials involves multiple steps such as mixing expensive raw material powder with a powder lubricant, compression molding, removing the powder lubricant, firing in a reducing atmosphere or vacuum, and sizing. Therefore, manufacturing costs are high. In addition, the production line becomes a bad environment where dust and heat generation cannot be avoided.
It is also unfavorable from a safety and health standpoint.

[Means for Solving the Problems] According to the present invention, in order to solve the above problems, a manufacturing process that provides greater strength and equivalent sliding durability without going through the sintering process is provided. I will provide a. In other words, the mount link 1 and the bayonet link 2, which were produced through a progressive press process, are joined by spot welding, and then directly connected to the N
The basic manufacturing process is one-chuck finish cutting using a C lathe, which is simple, clean, and easy to automate.

However, the mount manufactured in this process has a sliding number of times of 2.
00 times, the surface of the other lens mount etc. is damaged and the appearance is not only unsightly, but in severe cases, the amount of flange back changes as well, impairing camera function. Therefore, the present invention provides excellent attachment/detachment and sliding durability by drilling a fine hole 15 with a laser or an electron beam in the pressed mount ring l at the sliding part with the other mount and impregnating it with lubricating oil after cutting. giving sex. It is thought that the action of sliding the mount on and off causes local heat generation or negative pressure suction to promote capillary action, causing the lubricant to seep out to the mount surface.

[Example']' Examples of camera body mounts are shown below.

FIG. 1(a) shows a mount ring, and FIG. 1(b) shows a bayonet claw ring, both of which were made by press working. 1
Since a 10-ton crank press is used and punching is performed using a progressive die, the processing cycle is 60 s, p, m, that is, the part shown in the figure is processed at a high speed of 1 piece per second. At the same time, welding projection projections 5 are also formed. We used JIS and 5US304 for both materials, but if you are looking for free machining properties, use JIS to see if it has magnetism.

A ferritic stainless steel, such as Sυ5444, which has corrosion resistance equivalent to austenitic stainless steel by containing Mo may also be used. FIG. 2 shows the laser drilling process which is the gist of the present invention.

The shape of this hole is 0.155m in opening diameter and 0.6cm in depth.
It is. The laser processing machine used is pulse oscillation Nd:YA.
With a G laser, a φ10 mask is installed in the laser optical path in the laser oscillator with a lamp input voltage of 1.2 KV, and a φ20
Once the luminous flux is changed to φlO, it becomes a luminous flux that is easy to narrow down. The focal length of the condenser lens 10 is 35 mta and is aligned on the surface of the focal mount ring l, and the assist gas is at a pressure of 1 k.
Air of g-f/C1+2 is used. The heat radiation time is l
ll5. The beam was focused 10 times per second. mount ring l
is rotated once in 10 seconds by the DC motor 14 using the mount holding member 13, as shown in FIG. 2(b).
100 holes are drilled on 64 concentric circles. The lens side mount has a circular protrusion with a width of 1 mrB and a height of 0.5 mm with a diameter of 64 mm at the center, and only that part is in contact with the camera body side of the embodiment. That is, in this embodiment, 100 fine holes are made in a row at equal intervals on the center line of the area where the lens side mount and the camera body side mount come into contact. Next, FIG. 3 shows a projection spot welding process for joining the mount ring 1 and the bayonet claw ring 2. A comb-shaped electrode 16 with a diameter of 10 mm is provided so that the eight projection projections 5 are centered.
Welded using a capacitor spot welder. The power supply capacity of this welding machine is 10KVA and the capacitor capacity is 40KVA.
．． It is 500 leF. 8 by the air press attached to the welding machine
Welding was carried out at a voltage of 280V while applying a pressure of 1 ton to the entire projection projection 5 so that a uniform load was applied to each location. At this time, the final pressing force, or forging pressure, was 1.5 tons. Further, the height of the projection protrusion 5 is pressed in advance so that it is within a range of ±0.3 mm to ensure a uniform load. By spot welding at these eight locations, a nugget 17 is formed and the strength of this mount is maintained. That is, the camera body mount of the present invention is installed on the camera, a 150m+++ telephoto lens is attached, and the tip of this telephoto lens is used as the point of emphasis, and the 8-meter angle perpendicular to the optical axis is set.
After applying a force of 7 kg-f in the direction, the amount of deformation of the bayonet claw 6 in the optical axis direction was measured to be a maximum of 3 gm, and the mount ring and bayonet claw ring could be attached to the four screw holes 4 without spot welding. The amount of deformation has been greatly suppressed compared to the maximum of 35 gm which is the result of a mount with a structure that is simply fixed with screws.

Next, the cutting process will be explained with reference to FIG. Figure 4 (A)
The figure shows the cutting direction, and the outermost circumference was chucked and cut with the bottom surface in the figure as the butt. The machining allowance is 0.3 mm on one side for the inner and outer diameter portions and 0.1 mm for the upper end surface. The cutting conditions were as follows: An NC lathe was used, the spindle rotation speed was 75 or-pm, the feed was 0.07 mm, and the cutting tool was made of carbide. Figure 4 (
B) and (C) are enlarged cross-sectional views of the microhole before and after cutting,
FIGS. 4(D) and 4(E) are enlarged cross-sectional views of the mount having the minute holes as seen in the radial direction. As shown in this figure, the laser-drilled openings are either left with a melted residue 18 or a protrusion, which is removed by cutting.

After cutting, the sealing part 1 is placed so as to cover part of the fine hole.
9 is generated, which contributes to making it difficult to visually recognize the existence of the hole in terms of appearance, and also helps to retain the lubricant even after the hole is impregnated with lubricant. The mount that has been cut in this manner is shown in FIG. 5, and the cutting oil is removed using trichloroethane, and the process proceeds to the step of impregnating the minute holes with a specified lubricating oil. That is, the oil impregnation step was performed by immersing the mount in lubricating oil heated to 100° C. and under vacuum.

Finally, the lubricating oil adhering to the surface was removed again using trichloroethane. The lubricant used here is 40
It was a fluid lubricating oil with a viscosity of 9.58 cst at °C. Instead of this lubricating oil, the viscosity is 30.3 cs.
When a high viscosity material of t was used, it was necessary to perform 200 attachment/detachment slides until the lubricating effect appeared, and the lens side mount surface was damaged during this time. On the other hand, viscosity 2
．． When 02cst low viscosity lubricating oil was used, the lubricating oil was removed even after careful degreasing with trichloroethane and no effect was obtained.

[Effects of the Invention] The camera body mount manufactured according to the present invention can now be processed using progressive press processing, which is a speedy and high-precision processing method. In addition, the post-cutting process requires only one-chuck cutting using an NC lathe, and the machining time is significantly shortened even through the entire machining process. As a result, processing costs are approximately half that of sintering. Furthermore, looking at the processing equipment, all of them are capable of supplying stable products in a clean environment.

[Brief explanation of the drawing]

FIG. 1(a) shows the eye of a pressed mount ring 2, FIG. 1(b) shows a bayonet ring, and FIG. 2(a) shows a method of drilling with a laser. Figure 2(b) is a front view of the mount ring with the hole drilled, Figure 2(c) is a sectional view of the mount link with the hole drilled, Figure 3(a) is a diagram showing the spot welding method, Figure 3(b)
) is an enlarged cross-sectional view before spot welding. FIG. 3(C) is an enlarged sectional view immediately after spot welding, and FIG. 3(d) is an enlarged sectional view after spot welding. Fig. 4(a) is a diagram showing the cutting method, Fig. 4(b) is a cutting shear cross-section diagram of the drilling part, and Fig. 4(c) is a diagram showing the cutting method.
) is a sectional view of the drilled part after cutting, Figure 4(d) is an enlarged cross-sectional view of the drilled part in the radial direction before cutting, and Figure 4(e) is the radial 1, mount ring 2, bayonet link 3 after cutting of the drilled part. , counterbore 4, screw hole 5, projection protrusion 6. Claw 7, laser oscillator 8, reflector 9, laser optical path 10, condenser lens 11, processing nozzle 12, compressed gas flow path 13, mount holding member 14, motor 15, hole 16, electrode chip 17, nugget 1B, melting Residue 19, sealing part (Q) 1 mouth (t)) = layer = t = = moat; C) 宕LF 口(d) Ce)

Claims (1)

[Scope of Claims] (i) A step of forming a two-piece mount member and drilling a fine hole on an optical axis concentric circle on the outer peripheral end surfaces of the first and second mount members; and (ii) the first and second mounts. After fixing the member, a step of cutting the surface including the surface with the micro-holes to determine the dimensions (iii) A step of impregnating the micro-holes of the mount member with the dimensions described in (i), (ii), and (iii) above. A method of manufacturing a mount member for an optical device, the method comprising: