JP3052427U - A chain device made by nitriding the surfaces of pins and plates. - Google Patents

Abstract

(57) [Abstract] [Purpose] The surface hardness is increased by nitriding the shaft hole provided in the plate of the chain device and the pin passing through the shaft hole.
It has a structure with excellent wear resistance with low friction resistance,
Reinforcement part directly on or attached to the box (hereinafter referred to as
And the center pin of the chain device can be welded directly or indirectly. [Structure] A chain device that combines a nitridated pin and a plate formed by nitriding at least a shaft hole, which is mounted on each box of a telescopic cover, and a washer for welding a reinforcing member to a center pin is press-fitted into the center pin. ,
In addition, a chain device in which a stepped portion is provided on the center pin and the surface of the pin and the plate formed by inserting and welding the stepped portion to the reinforcing member portion is nitrided.

Description

[Detailed description of the invention]

There is a telescopic cover comprising a plurality of mutually fitted boxes for protecting a sliding portion of a machine tool, which is representative of the industrial field using a chain device. In the telescopic cover, the boxes fitted to each other are connected by a chain device to control the sliding of the boxes. Depending on the size of the clearance between the pin diameter of the chain device and the diameter of the plate, a noticeable difference appears in the smoothness of sliding of the box connected to the chain device. If the clearance is large, there is play in the operation of the chain itself, resulting in rattling and unbalanced movement. Conventional chain devices are based on pins and plates made of raw or tempered material, or those with bearing metal mounted on the plate's shaft holes to reduce wear on the plate's shaft holes and pin outer diameters. I have. When the material of the pin and the plate is raw or tempered as described above, the outer diameter of the pin and the abrasion of the plate shaft hole are large, and the clearance of the bearing part becomes larger in addition to the initial clearance, and the clearance is expanded. The surface pressure between the pin and the shaft hole also increases temporarily, further promoting wear. In the case of mounting the bearing metal in the shaft hole of the plate, the dispersion increases due to the plate hole diameter, the shaft hole of the bearing metal, the dimensional change at the time of mounting, etc., and the initial clearance must be adjusted to allow the dispersion. It is necessary to set a large value, and the variation causes a large pitch error and a large play in the movement of the chain device, and the movement becomes uncertain. As described above, the failure of the chain devices mounted on the left and right between the boxes causes distortion and galling on the sliding surface between the boxes during operation, causing a problem of early life.

The present invention has been intensively studied in order to solve such a problem, and will be described below with reference to the drawings. 1 and 2 show perspective views of the entire chain device. FIG. 1 shows a general equi-pitch chain apparatus 1-A, and FIG. 2 shows a utility model which has already been obtained by the present applicant, registration No. 3047883, and a name of the invention "unequal pitch expansion / reduction type combined pantograph". This shows an unequal pitch chain device 1-B, which is formed by basic components of a plate 2, a center pin 3-1 and a side pin 3-2. FIGS. 3-1, 2 and 3 are perspective views showing examples of the number of stacked plates. FIG. 3-1 shows a two-layer plate type, FIG. 3-2 shows a three-layer plate type, and FIG. A stacked plate type or a multi-layer structure of thinner plates may be used. This shows a state in which the overlapped plates 2 are locked by a center pin 3-1. Means for locking are a C-shaped retaining ring, a spring pin, a bolt (not shown), and various other types. There is a method, but any method may be used. The center pin 3-1 and the inner center pin 3-1 of the side pins 3-2 face each of a plurality of fitted-in boxes for protecting a sliding portion of a machine tool, and are directly or fixed to the box. It is fixed via a reinforcing member (hereinafter referred to as a reinforcing member) 13, and welding is most suitable as the fixing means. That is, there is an advantage that loosening does not occur as in bolting. When the center pin 3-1 is welded to the reinforcing member 13, it is an essential condition that there is no nitrided layer in the welded portion. Even in the case of liquid nitriding or gas nitriding, the purpose can be achieved by masking the required weld with plating or the like before nitriding. On the other hand, the plate may be subjected to nitriding treatment only on at least the inner surface of the shaft hole, or may be entirely nitrided. However, the whole nitridation is more effective in reducing the friction coefficient between the overlapping surfaces of the plates and improving the wear resistance. It is more desirable because it does not require any steps such as masking. Of the center pins 3-1 or the side pins 3-2, at least the whole of the center pin 3-1 is subjected to a nitriding treatment, and one of them is welded as shown in the sectional view of FIG. A press-fit pin 11 having an outer diameter D and a press-fit washer 12 having an inner diameter 0.2% or less than D is D ′, and the pin 11 is press-fitted into the press-fit washer 12. Is shown in the sectional view of FIG. FIG. 5A is a cross-sectional view showing a pin 14 having a stepped portion A (hereinafter referred to as a pin with a stepped portion) which has been entirely nitrided. The nitrided layer at the welded portion on the end of the stepped portion of the stepped pin 14 is cut off with a sander or the like so that the welded portion can be welded to the reinforcing member 13 with an inner diameter corresponding to the outer diameter of the stepped portion. FIG. 5B is a cross-sectional view showing a state in which the stepped portion A of the stepped pin 14 is inserted into the hole and the portion B is fixed by welding. Also, the inner surface of the washer 12 of the pin 11-A having the press-fit washer and the reinforcing member 13 are provided in a hole having an inner diameter corresponding to the outer diameter of the pin 11 having the press-fit washer provided on the reinforcing body 13 with the pin 11-A having the press-fit washer. Fig. 4-3 shows a state in which the parts are inserted until they come into contact with each other, and the part C in the figure between the contact parts is fixed by welding. FIGS. 4-3 and 5-2 show a state in which the center pin is fixed to each reinforcing member 13. As shown in FIG. 4-3, the washer 12 of the washer press-fit pin 11-A is welded to the reinforcing member 13. FIG. 6-1 shows a state in which the plate 2 of the chain device is mounted thereon. In the figure, a pin 11-A with a press-fit washer is welded to a reinforcing member 13 as shown in the figure, and the plate 2 is locked by a C-shaped retaining ring 16 or the like via upper and lower washers 15. FIG. 6B is a cross-sectional view showing a state in which the stepped pin 14 is welded to the reinforcing member 13 and the plate 2 is attached thereto as shown in FIG. 5-2. In the figure, the stepped pin 14 is welded to the reinforcing member 13 as shown in the figure, and the plate 2 is locked by the C-shaped retaining ring 16 via the upper and lower washers 15. The locking of the plate 2 by the side pin is performed by locking the plate 2 with a C-shaped retaining ring 16 via upper and lower washers 15 on a pin 11-A with a washer as shown in the sectional view of FIG. . Although the C-shaped retaining ring has been exemplified as a method of locking the plate 2, the locking may be performed by a spring pin or other methods. A chain formed by nitriding the surface of pins and plates that can contribute to the formation of a high-performance telescopic cover by combining a box with a chain device, a combination of a plate 2, a center pin, and a side pin in each of the above methods. apparatus.

[Brief description of the drawings]

FIG. 1 is a plan view of an equi-pitch chain device.

FIG. 2 is a plan view of the unequal pitch chain device.

FIG. 3-1 is a perspective view of a two-plate superposition type.

FIG. 3-2 is a perspective view of a three-plate superposition type.

FIG. 3-3 is a perspective view of a four-plate superposition type.

FIG. 4-1 is a cross-sectional view showing a press-fit pin 11 and a press-fit washer 12 for press-fitting the pin.

FIG. 4-2 is a cross-sectional view of a pin 11-A with a press-fit washer in which the press-fit pin 11 is pressed into the press-fit washer 12.

FIG. 4C is a cross-sectional view showing a state in which the pin B is inserted into a hole having an inner diameter corresponding to the outer diameter of the press-fit pin 11 provided in the reinforcing member 13 and a portion B is fixed by welding.

FIG. 5-1 A pin 1 with a stepped portion which is entirely nitrided
Sectional drawing of 4.

FIG. 5-2 is a cross-sectional view showing a state where the stepped portion of the stepped pin 14 is inserted and the portion B is fixed by welding.

FIG. 6-1 is a cross-sectional view showing a mounted state of a center pin and a plate.

FIG. 6-2 is a cross-sectional view showing a mounted state of the center pin and the plate.

FIG. 6-3 is a cross-sectional view showing a mounted state of a center pin and a plate.

[Explanation of symbols]

1-A equi-pitch chain device. 1-B Unequal pitch chain device. 2 plates. 3-1 Center pin. 3-2 Side pins. 11 Press-fit pin. 11-A Pin with press-fit washer. 12 Press-fit washers. 13 Box or reinforcement attached to it. 14 Stepped pin. 15 Washer. 16 C type retaining ring. A Stepped part. B Weld fixing part. C Welding portion between the press-fit washer 12 and the reinforcing body 13. D Outside diameter of press-fit pin. D 'Inner diameter of press-fit washer. A. The part to be welded.

Claims (3)

[Utility model registration claims] 1. A chain device for connecting telescopic covers consisting of a plurality of boxes fitted together for protecting a sliding portion of a machine tool, comprising a rectangular flat metal plate material processed to a required length. At least two plates provided with three shaft holes, a center portion shaft hole and a side portion shaft hole on the center portion and both side portions, respectively, are stacked on the resulting plate, and a metal center penetrating the center portion shaft hole of the stacked plate. Assemble a plurality of assembly parts which are locked with pins, alternately expand the tips of the respective overlapping plates, overlap the adjacent tips between the assembly parts, and overlap the overlapping side portion shaft holes. In the chaining device which is locked by a side pin penetrating through, the inner surface of at least the center shaft hole and the side shaft hole of the plate, and at least the center pin and the side pin Vickers Hm surface hardness By respectively nitriding the surface of the axial bore facing rate
A chain apparatus comprising a pin and a plate, wherein the surface of the pin and the plate are nitrided. 2. The chain device according to claim 1, wherein at least the entire center pin of the center pin and the side pin is subjected to nitriding treatment. A chain device characterized in that a center pin or a side pin is press-fitted into an inner diameter portion of a weldable washer having an inner diameter smaller than the outer diameter by 0.2% or more and assembled as a pin with a press-fit washer. 3. The chain device according to claim 1, wherein the surface of the pin and the plate is nitrified, and a stepped portion having a slightly smaller diameter at the tip is provided at one end of the center pin of the chain device. At least, the nitrided layer was not present in the welded part at the foremost surface thereof, and was provided in a hole directly provided in a box having a thickness corresponding to the depth of the step portion or a reinforcing plate fixed to the box. A chain device, wherein the stepped portion is inserted into a hole, and the tip portion and the hole can be welded and fixed.