KR101794476B1 - Apparatus for manufacturing oilless bearings for dry vacuum pump and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing an oilless bearing for a dry vacuum pump, capable of reducing manufacturing time by simplifying a manufacturing process, and improving price competitiveness of products by reducing the defective rate while improving the productivity, and to a manufacturing method thereof. The apparatus of the present invention comprises: a worktable having a work plate and a plurality of support legs; a base material fixing means including a disk plate, an upper fixing jig, a lower fixing jig, and a vibration buffering plate; a rotation driving means; and a punching means.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing an oilless bearing for a vacuum pump,

The present invention relates to an apparatus for manufacturing an oilless bearing for a vacuum pump and a manufacturing method thereof, and more particularly, to an apparatus and a method for manufacturing an oilless bearing for a dry vacuum pump, which can simplify a manufacturing process and shorten a manufacturing time, To an apparatus for manufacturing an oilless bearing for a vacuum vacuum pump and to a manufacturing method thereof.

Vacuum pump in the pump is a device that makes vacuum in the space by artificially controlling gas molecules in a certain space. It is a device for manufacturing semiconductor and display device requiring high cleanliness and high precision by removing foreign substances and unnecessary gas in the space It is used to create a working environment suitable for process and product production, or to discharge gas generated during the manufacturing process.

Such a vacuum pump can be roughly divided into a wet type and a dry type. The wet type vacuum pump uses oil to realize high vacuum. The dry type vacuum pump has a relatively low degree of vacuum but does not use oil, It has good durability and easy maintenance.

Since the dry vacuum pump does not use oil, an oil-less bearing is used for the bearing arranged for smooth operation of each component disposed therein.

In general, oilless bearings are dry lubricant bearings in which a special solid lubricant is embedded in a base metal. Fine particles of the solid lubricant form a fine lubricating coating on the concave and convex surfaces of the moving parts during friction, Is an oil-free bearing with excellent self-lubrication and excellent wear resistance.

The special solid lubricant used is graphite, Teflon, etc. It is mainly used for the friction part that performs low speed motion. Since the solid lubricant has higher friction coefficient than the liquid lubricant, frictional heat is generated during high speed operation. It is mainly used for low-speed low-speed motion, reciprocating motion, impact load, angular oscillation motion, and discontinuous stop motion motion without oil lubrication in principle.

Such oilless bearings are generally formed into a circular shape by using a machine tool such as a CNC machine, but the planar type or the special type is largely dependent on manual production, resulting in poor uniformity of quality and difficulty in productivity management.

The prior art related to the production of conventional oil-less bearings is Korean Patent Registration No. 10-0496655 (registered on December 02, 2004). In the prior art, the sliding bearing is formed through the sintering step and the rolling step, A method of manufacturing a bearing, comprising the steps of: applying a non-graphite mixed metal powder not containing graphite to a surface of a metal sheet; and applying a graphite mixed metal powder to the non-graphite mixed metal powder to gradually increase the graphite distribution. And a step of applying a bearing material to apply the powder in a laminated manner. As a result, it is expected to improve the quality by reducing defects in sintering and to increase the production amount by simplifying the process.

However, in the above-mentioned prior art, there is a problem in that it is difficult to secure uniformity of quality and addition of an unnecessary process step as a method based on a metal powder, resulting in lowering of productivity and occurrence of defects.

In addition, since it is difficult to quickly change to various standards, there is a problem that various demands of consumers can not be satisfied.

On the other hand, Korean Patent Laid-Open No. 10-2005-12355 (published on Feb. 22, 2005) discloses another prior art related to the manufacture of oilless bearings. Providing a graphite fins in the holes, applying a refractory graphite material to the graphite frit and forming a mold, and injecting molten metal into the fritting mold .

As the surface condition of the casting is almost similar to that of the finished product, the process can be shortened and the cost can be reduced. However, since the same loss model as the production unit must be formed, the cost is increased, , Foamed polystyrene, polymethyl methacrylate, which are raw materials of the disappearance model, are harmful to human body and have a problem that they adversely affect the health of workers when they are exposed for a long time.

Further, Korean Patent Registration No. 10-587726 (registered on Jun. 1, 2006) proposes an oilless bearing carbon hole processing apparatus. In the above conventional technology, several holes are automatically formed on the surface of an oilless bearing formed in a tubular shape To a processing technology.

However, in the related art, it is possible to form one hole at a time, to change the position of the drill head motor after forming one hole, to rotate the oil-less bearing, There is a problem in that the productivity is lowered due to the necessity and further there is a problem that the probability of occurrence of defects is high because it is difficult for a worker to visually confirm the position where the work is perforated.

0001. Registration No. 10-0496655 (registered on December 02, 2004) 0002. Published Patent No. 10-2005-12355 (published Feb. 2, 2005) 0003. Registration No. 10-587726 (registered on June 1, 2006)

The present invention relates to a method of manufacturing an oilless bearing used in a dry vacuum pump, which can shorten the manufacturing time by shortening the manufacturing process, thereby improving the productivity and reducing the defective rate, And an object of the present invention is to provide an apparatus for manufacturing an oilless bearing and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a work table comprising: a work table having a flat upper surface; a work table having a plurality of support legs such that the work plate is spaced upward from a floor or a floor surface; An upper fixing jig for fixing the upper end of the base material, a lower fixing jig for fixing the lower end of the base material, and a lower fixing jig for absorbing vibrations and shocks generated in the boring operation A driving magnet coupled to a rod end of the lifting cylinder and a driven magnet disposed in a bottom surface groove of the disk plate. The base plate includes a base material holding unit including a vibration buffer plate, a lifting cylinder disposed below the work table, A drive motor, and a drill coupled to the drive motor, And a drilling unit including a coupling bracket to which the driving motor is independently coupled and a moving cylinder to adjust a position of the coupling bracket, wherein the working plate is formed in a flat plate shape, An annular guide groove is formed in the inner circumferential surface of the seat portion to prevent displacement of the disc plate when the disc plate is rotated, An annular guide protrusion that is rotatably coupled to the inner surface of the work plate and is formed to be recessed inwardly on the bottom surface and is inserted into the guide groove of the work plate on the outer circumferential surface of the work plate .

Further, the disc plate is further provided with a cutting groove for guiding the lower fixing jig so as to be movable from the center to the edge side.

The coupling bracket may further include coupling means for coupling the driving motor to the coupling bracket so that the coupling brackets are detachably coupled to each other, wherein the coupling means is provided at one end of the coupling bracket, A slide groove formed along the longitudinal direction forward and formed with a plurality of fastening holes; a guide projection provided at the other end of the engagement bracket and movably inserted into the slide groove; And a fastening screw for pressing and fixing the fastening member.

A first step of disposing a base material cut in a predetermined length in a base material fixing means; a second step of fixing the base material through an upper fixing jig and a lower fixing jig; A fourth step of boring a hole in the base material by driving the perforating means, a step of separating the perforating means from the base material, and then rotating the disc plate through rotation driving means in the same manner as in the third step And a sixth step of moving the boring means to the base material side and perforating a hole in the base material in the same manner as in the fourth step so as to change the position of the base material by rotating the oilless bearing for the dry vacuum pump The method comprising the steps of:

According to the present invention, there is provided an apparatus for manufacturing an oilless bearing for a vacuum vacuum pump and a method of manufacturing the oilless bearing for a dry vacuum pump, wherein the oilless bearing having different diameters and lengths is replaced or replaced in one manufacturing apparatus It is possible to produce without using, and it absorbs the vibration and shock generated during the base material machining, and it can drill several holes at a time, shortening the manufacturing time and reducing the production of defective product, have.

1 is a schematic view showing an apparatus for manufacturing an oilless bearing according to the present invention;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oilless bearing manufacturing apparatus.
3 is a schematic view showing a rotational driving means of an oilless bearing manufacturing apparatus according to the present invention.
4 is a schematic view showing a punching means of an oilless bearing manufacturing apparatus according to the present invention;
5 is a flowchart showing an operational state of an oilless bearing manufacturing apparatus according to the present invention.

Hereinafter, other objects and features of the present invention will be apparent from the following description of embodiments with reference to the accompanying drawings.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

An apparatus 1 for manufacturing an oilless bearing for a vacuum vacuum pump according to the present invention comprises a work table 10, a base material fixing means 20, a rotation drive means 30 and a boring means 40.

The work table 10 is provided with a base material fixing means 20, a rotation driving means 30 and a perforation means 40 and is provided with a base MA for an oilless bearing, And a plurality of support legs 12 are provided so that the working plate 11 is spaced upward from the floor or the floor surface.

The working plate 11 is formed in the shape of a flat plate and has a notched portion 111 formed at the center in a downward direction and an outflow hole 112 penetrating upward and downward at the center of the notched portion 111.

The disk 111 is rotatably arranged in a disk plate 21 of a base material securing means 20 to be described later and is recessed downward from the upper surface of the work plate 11.

An annular guide groove 113 is formed in the inner circumferential surface of the inner ring 111 to prevent the disc plate 21 from being displaced when the disc plate 21 rotates. A plurality of rotational bearings (not shown in the drawing) disposed radially may be further provided.

It is preferable that the support leg 12 is further provided with a caster 13 which is supported from the bottom so that the work plate 11 is disposed above the ground or the bottom surface and a plurality of the support legs 12 are disposed and movable and fixed to the end portion.

The base material fixing means 20 fixes a base material formed of a tube-shaped tube for forming the oilless bearing, and is composed of a disk plate 21 rotatably arranged on the upper surface of the working plate 11 An upper fixing jig 22 for fixing the upper end of the base material MA, a lower fixing jig 23 for fixing the lower end of the base material MA, And a vibration damping plate 24 for absorbing vibrations and shocks.

The disc plate 21 is rotatably coupled to the inner teeth portion 111 of the working plate 11 and is formed with a groove 211 which is formed on the bottom surface so as to be inwardly recessed. An annular guide protrusion 213 which is movably inserted into the guide groove 113 of the working plate 11 is further formed on the outer circumferential surface of the rim, do.

The recess 211 is recessed inward from the center of the bottom surface of the disc plate 21, and the driven magnet 31 of the rotational driving means 30, which will be described later, is fixedly disposed. At this time, it is preferable that the grooves 211 are disposed on the same vertical center line as the entry / exit holes 112 formed in the working plate 11.

The cutout groove 212 is formed in the upper surface of the disc plate 21 and cuts from the center of the disc plate 21 to the edge so that a lower fixing jig 23 described later is guided along the cutout groove 212 do.

At this time, a plurality of cutting grooves 212 may be arranged on the upper surface of the disc plate 21 with a predetermined distance therebetween, and the lower cutting jig 23 may be divided into a plurality of So that the base material MA can be fixed.

The annular guide protrusion 213 protrudes outward from the outer circumferential surface of the rim of the disc plate 21 and is movably inserted into the guide groove 113 formed in the inner ring portion 111 of the working plate 11 . The disc plate 21 is prevented from being released while being rotated through the rotation driving means 30 to be described later in a state of being coupled to the inner teeth portion 111 of the working plate 11. [

The upper fixing jig 22 fixes the position of the base material MA by pressing the upper end of the base material MA disposed on the upper surface of the circular plate 21 and is lifted or lowered by the lifting means 22a. And is brought into close contact with the upper end portion of the base material MA when it descends to press-fix the base material MA from above.

The bottom surface of the upper fixing jig 22 contacting the base material MA is preferably made of a soft material for preventing the surface from being damaged by friction with the base material MA. Urethane and a pad of urethane material may be further attached to the bottom surface of the upper fixing jig (22).

The elevating and lowering means 22a includes an upper rod 222 having one end coupled to the upper surface of the upper fixing jig 22 and an upper cylinder 221 through which the upper rod 222 enters and exits, The power supply means for supplying power to the upper cylinder 221 and the operation relationship between the upper cylinder and the upper rod are the usual ones, and a detailed description thereof will be omitted.

The lower fixing jig 23 is for fixing the lower end of the base material MA disposed on the circular plate 21 and movably coupled to the cutout groove 212 formed in the circular plate 21, And an adjusting screw 231 that allows the lower fixing jig 23 to be fixed or movable to the disc plate 21 through the releasing action.

The lower fixing jig 23 is tightly fixed to the outer edge of the working base material MA and is provided symmetrically with respect to at least one pair of mutually opposing directions and includes a fixing body 232 closely attached to the outer peripheral surface of the base material, A fixing plate 234 disposed at a position spaced apart from the fixing body 232 and a protrusion protrusion 234 movably inserted into the cutout groove 212 235).

At this time, the adjusting screw 231 is disposed on the outer side of the fixing plate 234, and a threaded body passes through the fixing plate 234 and then passes through the adjusting hole 233 So that the user can adjust the position of the fixing member 232 by rotating the head.

In order to prevent the surface of the base material from being damaged by friction with the base material, a pad of the urethane material described above is preferably attached to the tip of the fixing body 232, that is, the portion contacting the base material MA.

The vibration damping plate 24 absorbs impact and vibration generated when holes are formed in the base material MA fixed by the upper fixing jig 22 and the lower fixing jig 23, And is arranged to protrude in the vertical direction outside the rim of the disc plate 21 so as to be movable toward the disc plate 21 through the fixed cylinder 241, And an absorbent pad of a soft material such as urethane or the like is further provided.

The vibration damping plate 24 moves toward the base material MA by the fixed cylinder 241 and moves to the outer side of the base material MA or moves to the outer side of the base material MA, And the like.

1 and 3, the rotation driving means 30 is for rotating the disk plate 21. The rotation driving means 30 includes a lifting cylinder 32 disposed below the work table 10, A drive magnet 33 coupled to the end of the rod 321 of the ascending and descending cylinder 32 and a driven magnet 31 disposed in the bottom surface groove 211 of the disk plate 21.

Descending cylinder 32 drives the rod 321 through the applied power source so that the upper end of the rod 321 is inserted through the access hole 112 of the work plate 11 and then inserted into the groove of the disk plate 21 (211) or spaced from the groove (211).

The driving magnet 33 is coupled to the rod 321 and the driven magnet 31 is disposed in the recess 211. The driving magnet 33 is an electromagnet that generates a magnetic field when power is applied, So that the position of the mother material MA can be changed by applying power when necessary in processing the mother material MA.

The rotation driving means 30 may further include a position sensing sensor (not shown) for sensing the positions of the upper and lower fixing jigs 22 and 23, The sensor detects the position of the upper fixing jig 22 and the lower fixing jig 23 and transmits the detected position to a control unit (not shown in the figure). The control unit compares the previously stored reference position value with the sensed sensed value, When the positions of the fixing jig 22 and the lower fixing jig 23 are recognized as the correct positions, power is applied to the ascending / descending cylinder 32 and the driving magnet 33 to drive them.

As shown in FIGS. 1 and 4, the perforating means 40 includes a driving motor 41, a driving motor 41 coupled to the driving motor 41, And a moving cylinder 44 for adjusting the position of the coupling bracket 43. The driving motor 41 is connected to the driving motor 41 via the driving motor 41,

The driving motor 41 rotates the coupled drill 42 while being driven through an applied power source. As shown in FIG. 4, the plurality of driving motors 41 are disposed at mutually spaced positions.

The coupling bracket 43 is further provided with coupling means 45 to which the driving motors 41 are independently coupled and the coupling brackets 43 are detachably coupled to each other.

The coupling bracket 43 is formed by joining a plurality of pipes to form a hollow rectangular frame, and the coupling means 45 is provided at an upper end portion and a lower end portion, respectively, so as to be vertically stacked.

That is, the coupling bracket 43 is provided to vertically stack a plurality of driving motors 41 so as to perforate a plurality of holes at one time, and a plurality of driving motors 41 By changing the position of the driving motor 41, it is possible to shorten the time required for perforation while reducing defects occurring during drilling.

The engaging means 45 includes a slide groove 451 provided at one end of the engaging bracket 43 and a slide projection 452 and a fastening screw 453 provided at the other end of the engaging bracket 43, .

The slide groove 451 is formed in the upper end of the engagement bracket 43 and is formed along the longitudinal direction forward from the rear of the engagement bracket 43 as shown in FIG. Are coupled to each other.

The slide protrusion 452 is formed at the lower end of the engagement bracket 43 and is movably inserted into the slide groove 451 of the adjacent other engagement bracket 43. The slide protrusion 452 is fastened with a fastening screw 453 Is fixed to the position adjusted by tightening the fastening screw 453 in a position-adjusted state.

So that the plurality of coupling brackets 43 are vertically stacked in a multi-stage manner so that a plurality of holes can be drilled in the base material at a time.

As shown in FIG. 1, the perforation means 40 may be disposed at an angle of 90 ° with respect to the vertical center line of the base material. In this case, .

5, the method for manufacturing an oilless bearing for a vacuum vacuum pump according to the present invention includes a first step (S10) of disposing a base material cut into a predetermined length into a base material fixing means, A second step (S20) of fixing the base material through the upper fixing jig and the lower fixing jig, a third step (S30) of rotating the disk plate of the base material fixing means through the rotation driving means, A fifth step S40 for changing the position of the base material by rotating the disk plate through the rotation driving means in the same manner as the third step S30 after separating the perforating means from the base material, (S50), and a sixth step (S60) of moving the drilling means to the base material side and drilling holes in the base material in the same manner as the fourth step (S40).

The first step (S10) is a step of arranging a workpiece having a hollow tube or tube in the workpiece holding means to form an oilless bearing. At this time, the operator places the base plate .

The second step (S20) is a step of fixing the base material disposed on the base material fixing means through the upper fixing jig and the lower fixing jig. The lower fixing jig is closely fixed to the outer circumferential surface of the base material, As shown in Fig.

In the third step (S30), the machining surface of the base material is aligned with the drilling means through the rotation driving means, and the direction of the base material fixed to the base material fixing means is switched, .

In the fourth step (S40), a drilling operation is performed to drill a hole in the base material by driving the drilling means, wherein the drilling means includes a motor and a drill coupled to the motor, and the engagement bracket, The motor is driven while the tip of the drill coupled to the motor is in contact with the base material while the motor is driven to move the motor to the base material side while the moving cylinder is driven, It punches. At the same time, the moving cylinder is gradually moved to the base material side in the process of drilling the hole of the drill so that the hole is drilled in the base material.

In the fifth step (S50), a hole is drilled in the base material through a fourth step, the drilling means is moved to the home position, and then the base material is rotated through the rotation driving means. The base material is rotated to adjust the uncut surface to be perpendicular to the drill of the perforating means.

The sixth step (S60) is the same as the fourth step, in which a perforation is made in the base material by driving the perforating means.

According to the present invention, there is provided an apparatus for manufacturing an oilless bearing for a vacuum vacuum pump and a method of manufacturing the oilless bearing for a dry vacuum pump, wherein the oilless bearing having different diameters and lengths is replaced or replaced in one manufacturing apparatus It is possible to produce without using, and it absorbs the vibration and shock generated during the base material machining, and it can drill several holes at a time, shortening the manufacturing time and reducing the production of defective product, have.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

1: Oil-less bearing manufacturing apparatus MA: Base material
10: work table 11: work plate
12: support leg 13: castor
111: Anchibu 112: Entrance hall
113: guide groove
20: base material fixing means 21: disc plate
22: upper fixing jig 23: lower fixing jig
24: vibration damping plate 211: groove
212: incision groove 213: guide projection
221: upper cylinder 222: upper rod
231: adjusting screw 232: fixed body
233: Adjusting ball 234: Fixing plate
235: projecting projection 241: fixed cylinder
30: rotation drive means 31: driven magnetism
32: ascending / descending cylinder 33: driven magnetism
40: perforation means 41: drive motor
42: Drill 43: Coupling bracket
44: moving cylinder 45: engaging means

Claims (4)

A work table (10) provided with a working plate (11) having a flat top surface and a plurality of support legs (12) so that the working plate (11) is spaced upward from the ground or bottom surface;
A disc plate 21 rotatably disposed on the upper surface of the working plate 11, an upper fixing jig 22 for fixing the upper end of the base material MA and a lower plate 22 for fixing the lower end of the base material MA, A base material fixing means 20 including a fixing jig 23 and a vibration damping plate 24 for absorbing vibrations and impacts generated during the boring operation of the base material MA;
A drive magnet 33 coupled to an end of the rod 321 of the ascending and descending cylinder 32 and a drive magnet 33 connected to an end of the rod 32 of the disk plate 21, (30) comprising a driven magnet (31) arranged in the housing (211)
A drill 42 coupled to the drive motor 41; a coupling bracket 43 to which the driving motor 41 is independently coupled; And a drilling unit (40) including a moving cylinder (44)
The working plate 11 is formed in a flat plate shape and has a notch portion 111 formed at the center in a downward direction and an outflow hole 112 penetrating vertically at the center of the notch portion 111,
An annular guide groove 113 is formed on the inner circumferential surface of the inner ring 111 to prevent the disc plate 21 from being displaced when the disc plate 21 is rotated.
The disc plate 21 is rotatably coupled to the inner tooth portion 111 of the working plate 11 and has a groove 211 formed on the bottom surface so as to be inwardly recessed and protruded outward from the outer circumferential surface of the rim, An annular guide protrusion (213) movably inserted into the guide groove (113) of the working plate (11);
An incision groove (212) for guiding the lower fixing jig (23) so as to be movable from a center of the disc plate (21) to a rim side; And
And a fixing body (232) coupled to one side of the fixing jig (23) and having an arc shape corresponding to an outer circumferential surface of the base material (MA) is further formed. delete 2. The connector according to claim 1, wherein the engaging bracket (43)
The driving motor 41 may be independently coupled to the coupling bracket 43 and the coupling unit 45 may be detachably coupled to the coupling bracket 43,
The coupling means (45)
A slide groove 451 provided at one end of the engagement bracket 43 and formed along the longitudinal direction from the rear to the front and having a plurality of fastening holes 454,
A guide protrusion 213 provided at the other end of the engagement bracket 43 and movably inserted into the slide groove 451,
And a fastening screw (453) for fastening the outer circumferential surface of the guide protrusion (213) after passing through the fastening hole (454). A first step (S10) of arranging a tubular base material cut to a predetermined length in the base material fixing means,
A second step (S20) of fixing the base material through the upper fixing jig and the lower fixing jig,
A third step (S30) of rotating the disk plate of the base material fixing means through the rotation driving means,
A fourth step (S40) of drilling a hole in the base material by driving the perforating means,
A fifth step (S50) of changing the position of the base material by rotating the disk plate through the rotation driving means in the same manner as the third step (S30) after separating the perforating means from the base material,
And a sixth step (S60) of moving a boring device to the base material side and then drilling a hole in the base material in the same manner as the fourth step (S40). The method of manufacturing an oilless bearing for a dry vacuum pump .

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