KR20110077557A - Press tool for manufacturing an reinforcement plate, the reinforcement plate and an oil filter - Google Patents

Abstract

PURPOSE: A press apparatus for manufacturing a reinforcing plate of an oil filter, a reinforcing plate, and an oil filter are provided to prevent screw threads from getting loose by forming recessed surfaces in the corners of a base hole. CONSTITUTION: A press apparatus for manufacturing a reinforcing plate of an oil filter comprises a drawing stage, a piercing stage(4), and a burring stage(8). The drawing stage has a drawing punch(210) and a drawing die(310). The drawing stage forms a container with a bottom part(101) and inclined walls(102a). The bottom part corresponds to a base hole(104) of a reinforcing plate(100). The piercing stage has a piercing punch and a piercing die(320) and pierces the bottom part and parts of the inclined walls of the container. The burring stage has a burring punch(240) and a burring die(340). The burring stage forms flanges(102) and the base hole by expanding and bending the inclined walls of the container.

Description

Press Tool for Manufacturing An Reinforcement Plate and The Reinforcement Plate AND An Oil Filter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil filter and a reinforcement plate thereof, and in particular, a press device for forming a mounting base hole by pressing a flange on a reinforcement plate, a reinforcement plate manufactured by the press device, and an oil having the reinforcement plate. It is about a filter.

As shown in FIG. 1, an oil filter for filtering impurities in oil in an engine of an automobile, a mechanical device requiring lubrication, or a hydraulic device is provided with a core 12 inside a container-shaped housing 10. The filter element 14 is accommodated outside the core 12.

In addition, a reinforcing plate 20 is installed on an upper surface of the housing 10, and a seaming cap 16 is provided on an upper surface of the reinforcing plate 20 to be integrally coupled to the housing 10, and seaming. The cap 16 is provided with mounting portions for engines, hydraulic equipment, and the like (hereinafter referred to as "equipment") and packings 18 for airtightness.

As shown in FIGS. 1 and 2, the reinforcing plate 20 of the oil filter includes a flange 22 having a base hole 22a at the center thereof, and a radial direction of the base hole 22a. A plurality of oil inlet hole 24 is formed to the outside.

The base hole 22 is a portion in which a threaded portion 22b for screwing into a stud pipe (not shown) provided on the equipment side is formed, and the oil filtered through the filter element 14 is lubricated. It is provided as an outlet to the part, and the oil inlet hole 24 is provided as an inlet through which the oil circulating the lubrication part is introduced.

The stud pipe provided on the equipment side has a form in which a screw is formed on the outer circumference of the hollow pipe, and the threaded portion 22b formed in the base hole 22 of the reinforcement plate 20 is coupled to the threaded portion thereof, and the inside of the stud pipe Oil filtered through the neck exits and is supplied to the lubrication section of the equipment.

3 shows a process stage of a conventional progressive mold apparatus for producing the flange 22 and the base hole 22a in the reinforcement plate 20 described above.

As shown in FIG. 3, the progressive mold apparatus for manufacturing the reinforcement plate 20 conventionally uses a piercing punch 30 and a piercing die 40 at a piercing stage to form a reinforcement plate 20 made of steel. Drills a preliminary hole 21 having a diameter smaller than that of the base hole 22, and then uses a burr removing punch 31 and a die 41 at the burr removing stage to determine the corners of the preliminary hole 21. The rough end is removed and the flange 22 is then formed by pressing and expanding the burring punch 30 with a diameter larger than the preliminary hole 21 in the burring stage. After the flange 22 was formed on the reinforcing plate 20, tapping was performed on the base hole 22a to form the threaded portion 22b as shown in FIG. 4.

According to such a conventional flange forming step and a tap work step, a product defect occurs frequently when tapping the threaded portion 22b, which causes assembly failure when assembling to the equipment side according to such a defect. It is possible to develop even the problem of damaging a sliding part such as an engine by dropping out of fine pieces, so that a countermeasure is urgently needed.

That is, as shown in FIG. 4, since the inner periphery of the front-end | tip part (lower part in drawing) of the foundation hole 22a formed by the conventional flange shaping process forms a sharp edge, the foundation hole is (22a) When the tap tool is pushed in from the top to machine the threaded portion 22b, the inner edge portion of the tip portion is pushed downward to protrude.

In other words, the tip end face of the flange 22 does not overcome the feeding pressure of the tap tool and the flesh is pushed out before cutting by the tap tool is completed, so as to protrude sharply as in the 'A' part of FIG. 4. Will be.

In this way, the sharp threaded portion protruding from the front end surface of the flange 22 not only causes a poor coupling with the counterpart part, but also falls out when the foundation hole 22a is fastened to the stud pipe on the equipment side or during operation of the equipment. High risk and falling particles can cause fatal damage to the sliding parts of the equipment.

For this reason, conventionally, in order to remove the thread protruding sharply from the end face of the flange 22, it was necessary to separately chamfer using a counter sink 43 tool in a table drill, as shown in FIG. This lowered the yield and caused the cost to rise. This may not be so serious when looking at only one oil filter. For example, when producing an oil filter applied to a car, considering the number of cars produced per year and the A / S quantity, Is indeed a huge waste.

On the other hand, according to the conventional burring process, the upper edge portion of the base hole 22a has a shape of a simple round portion 22c naturally formed as the flange 22 is bent downward when burring.

As shown in FIG. 4, when the threaded portion 22b is machined by rotating the tab tool while pushing the tap tool into the round portion 22c formed on the base hole 22a of the flange 22, the round portion is rounded like the 'B' portion of FIG. 4. A phenomenon in which the portion 22c is pushed up sharply and thinly occurs.

In short, the upper portion of the rounded portion 22c on which the thread is initially formed lacks the force to support in the opposite direction of the progression of the tap tool, as if the thread of the tap tool penetrated the rounded portion 22c as if it was peeled off. Thin, sharply pushed up phenomenon occurs.

As described above, when the thread is pushed up from any part of the upper part of the base hole at the beginning of tapping, the tap tool is resisted to one side and the travel direction is displaced, so that the right angle of the threaded portion 22b is allowed. This makes it easier to get out of range, creating gaps when assembling equipment, causing leaks, and further increasing the possibility of mixing the unfiltered oil with the filtered out oil.

In addition, the thin and sharp threaded portion pushed up from the round part 22c during tapping has a high risk of falling off when tightened to the stud pipe on the machine side or during operation of the machine, and the dropped particles are caught in the sliding part of the machine, thereby causing fatal damage. Will be raised.

In order to remove the raised threaded portion, the yield is lowered and the cost is increased because a separate process such as a counter sink is required, as in the case of removing the thread that is sharply projected to the end face of the flange.

In FIG. 4, for convenience of understanding, one side of the base hole 22a is shown in a state where the threaded portion 22b is formed by tapping, and the other side is shown in a state before forming the threaded portion. The thread part 22b is formed in the periphery of the hole 22a, ie, the entire inner diameter surface of the flange 22.

The present invention was developed to solve the above problems, the first object of the present invention, in the step of forming the flange for the base hole in the reinforcing plate, the phenomenon in which the tip of the flange is pushed out during the tap process in advance in the pressing step In contrast, the present invention provides a press apparatus, a reinforcement plate, and an oil filter for manufacturing a reinforcing plate of an oil filter, which can fundamentally prevent the phenomenon of being pushed out to the front end face of a flange during tapping.

The second object of the present invention is, in addition to the first object described above, in the process of forming the flange for the base hole in the reinforcement plate, the thread is excessively threaded during tapping by forming a depression in the upper corner of the base hole of the flange in advance when tapping. In addition, the phenomenon of being pushed up is also prevented, and the center of the tab tool can be easily coincided with the center of the base hole so as to contribute to the improvement of the squareness of the threaded portion.

In order to achieve the above object, the press apparatus for manufacturing a reinforcing plate of an oil filter according to the present invention is a press apparatus for drilling a preliminary hole in an oil filter reinforcing plate and burring a base hole and a flange based on the preliminary hole. A drawing stage comprising a drawing punch and a drawing die for drawing-molding a container having a bottom portion and an inclined wall portion corresponding to a base hole on a material of a reinforcing plate; A piercing stage having a piercing punch and a piercing die for piercing the bottom portion and the portion of the inclined wall portion adjacent the bottom portion to drill a preliminary hole; A burring punch and a burring die having a diameter larger than the preliminary hole of the reinforcement plate are provided, and the inclined wall portion is expanded and bent to form a flange and a base hole, thereby changing the direction of the cut surface of the preliminary hole to the inside of the front end of the flange. It characterized in that it comprises a burring stage to form a slope entering.

In the above-mentioned press apparatus of the present invention, the burring punch includes: a first stage punch portion having a diameter larger than the preliminary hole of the reinforcing plate and pressing and expanding the periphery of the preliminary hole to form a flange and a base hole; The outer diameter is extended from the first stage punch portion, it is preferable to have a second stage expansion portion to form a recessed surface by pressing the upper peripheral edge portion of the base hole of the reinforcement plate during pressing.

In the press apparatus of the present invention, the second end expansion portion includes an inclined surface that extends radially outward from the first stage punching portion toward the upper side in the axial direction, thereby forming a depression surface having an inclined surface on the reinforcing plate. It is preferable.

In the press apparatus of the present invention described above, a third end extension is formed in the axial direction from the second end extension of the burring punch, and the third end extension extends upwardly of the recessed surface of the reinforcement plate. It is desirable to form.

In the press apparatus of the present invention, the thickness W between the maximum diameter of the second end expansion portion and the outer diameter of the first end punch portion is preferably thicker than the bone depth of the screw portion to be formed in the base hole of the reinforcing plate. Do.

In addition, the reinforcement plate of the present invention is a reinforcement plate which is installed on the upper portion of the oil filter and serves as the entrance and exit of the oil and fastened to the equipment side, the inner diameter is formed as a base hole to form a flange extending downward; A plurality of oil inlet holes are formed around the base hole; An inclined surface inclined inward is formed at the front end surface of the flange; The inner diameter of the base hole is formed in the form of a screw portion.

In the reinforcement plate of the present invention, the upper portion of the base hole of the flange, the recessed surface of the form of the diameter is extended from the upper peripheral edge of the base hole of the flange into the axial direction is formed, the screw portion is recessed It is preferable that the depth of the screw valley is formed to be shallower than the maximum diameter formed by the surface.

In the reinforcement plate of the present invention, an extension hole of a shape in which the maximum diameter portion of the recessed surface of the reinforcement plate is extended to the upper end in the axial direction is further formed, and the recessed surface enters the depth more than the depth of the extension hole. It is desirable to form.

In addition, the oil filter of the present invention and the container-shaped housing having a core installed therein; A filter element disposed outside the core and received inside the housing; An improved reinforcement plate of the present invention mounted to the housing upper end above the filter element; The seaming cap is integrally coupled to the housing on the upper surface of the reinforcing plate of the present invention.

According to the present invention, since the inclined surface deeply penetrated inwardly into the front end surface of the flange in the burring process, even if the thread is formed through the tap tool, the thread is pushed out to the front end surface of the flange so that no phenomenon occurs.

In addition, since the degree of protruding of the thread is small and formed by the inclined surface, and the flesh is secured to the root portion of the thread by the inclined surface, and there is an effect of sustaining it with great force. The amount of protruding is much smaller than that of forming the shape, and the thickness of the root portion of the thread is so thick that the rising angle is small and does not fall easily.

Furthermore, the present invention also provides a recessed surface at the corner of the foundation hole in the burring process in advance, so that the thread is pushed up and lifted off the corner surface of the foundation hole at the time of tapping, and the phenomenon that the raised thread falls out is simultaneously suppressed. Can be.

Therefore, the oil filter having such a reinforcement plate has a good mounting accuracy for the equipment, and can maintain a very good quality without the occurrence of thread-falling particles and no damage to the lubrication portion.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6 is a view showing the process stages of the progressive mold apparatus for reinforcement plate press molding according to the present invention.

As shown in FIG. 6, the press apparatus of the present invention includes a drawing stage 2, a piercing stage 4, a burring stage 8, and furthermore, a piercing stage 4. The burr removing stage 6 is sequentially provided between the burring stages 8 to sequentially carry the reinforcing plate material 100, and then the pressing process is performed.

The drawing stage 2 includes a drawing punch 210 and a drawing die 310, flows the drawing punch 210 into the drawing die 310, and forms the material of the reinforcing plate 100 in the base hole 104. ) Is molded into a container shape having a bottom portion 101 and an inclined wall portion 102a corresponding to (see FIG. 6D).

The piercing stage 4 has a piercing punch 20 and a piercing die 320, and the inclined wall portion adjacent to the bottom portion 101 and the bottom portion 101 formed in the drawing stage 2 described above ( A portion of the flesh of 102a is pierced to drill a preliminary hole 103a having a diameter smaller than that of the base hole 104. The preliminary hole 103a formed in this way forms a straight hole in the vertical direction.

The burr removal stage 6 is provided with the burr removal punch 230 and the die 330, and removes the rough edge part of the edge of the preliminary hole 103a.

The burring stage 8 includes a burring punch 240 and a burring die 340 having a larger diameter than the preliminary hole 103a of the reinforcing plate 100. The burring punch 240 forms a flange 102 extending downward by pressing and expanding and bending the inclined wall portion 102a so that the inner diameter surface of the flange 102 forms the base hole 104.

As shown in (d) of FIG. 4, when the flange 102 is formed by expanding and bending the inclined wall portion 102a, the preliminary hole 103a forms a front end surface of the flange 102, The direction of the cutting surface piercing the preliminary hole 103a is changed to form an inclined surface 103 which enters inward from the tip of the flange 102. Therefore, the inclined surface 103 may be formed on the front end surface of the flange 102 by changing only the direction of the preliminary hole 103a in the pressing process without a separate cutting process or a chamfering process.

In this way, when the inwardly inclined surface 103 is formed on the front end surface of the flange 102, tapping is performed on the inner diameter of the base hole 104 to form a threaded portion. In FIG. 7, for convenience of understanding, one side of the base hole 104 is shown in a state where the threaded portion 105 is formed by tapping, and the other side is maintained in a state where the base hole 104 before forming the threaded portion is maintained as it is. When the tapping is actually performed, the thread portion 105 is formed around the entire inner diameter surface of the base hole 104, that is, the flange 102.

As shown in FIG. 7, since the inclined surface 103 deeply inserted into the base hole 104 is formed in the front end surface of the flange 102 of the reinforcing plate 100, even if the thread is formed through the tap tool, the flange is formed. The thread is pushed out to the distal end face of 102 and does not protrude. Even if the thread is slightly pushed out, there is no fear of protruding more than the surface of the flange 102 like the 'C' portion of FIG.

Further, since the inclined surface 103 is formed with a small and low protrusion of the thread, the inclined surface is secured to the root portion of the thread thickly, and has an effect of sustaining it with a large force. The amount of protruding is much smaller than when threaded at the edges, and the thickness of the root portion is so thick that the rising angle is small and does not fall easily.

8 to 10, in the above-described burring stage 8, the inclined surface 103 is formed on the front end surface of the flange 102 to prevent the thread from being pushed out during the later tapping operation. A press apparatus is shown which can prevent the thread from being pushed up from the upper surface, that is, the upper edge of the base hole 104.

Specifically, FIG. 8 shows a burring punch, and FIG. 9 shows a view showing a state of forming a reinforcing plate with a burring punch. 10 is sectional drawing which shows the state of the reinforcement board after a tab process, one side showed the state in which the thread part was formed by the tab process, and the other side was shown in the state before forming the thread part.

First, as shown in FIGS. 8 and 9, the burring punch 240 of the present invention is a preliminary hole 103a drilled in the reinforcing plate 100 while passing through the drawing stage 2 and the piercing stage 4. Press punch for burring the foundation hole and flange. The burring punch 240 is installed to face the burring die 50 and presses the reinforcing plate 100 placed on the burring die 50.

Specifically, the burring punch 240 of the present invention includes a first stage punch portion 242 and a second stage expansion portion 244 whose diameter extends from the first stage punch portion 242, furthermore Includes a third end extension 246 extending axially from the second end extension 244.

The first stage punch part 242 has a diameter larger than that of the preliminary hole 103a of the reinforcement plate 100 shown in FIG. 8 and presses the periphery of the preliminary hole 103a to expand the flange shown in FIG. 9. 102 and base hole 104 are formed.

The second stage expansion portion 244 is formed in a shape in which the diameter is extended from the first stage punching portion 242, pressing the upper peripheral edge portion of the base hole 104 of the reinforcement plate 100 during pressing Recess

As in the present embodiment, the second end extension 244 is preferably made of an inclined surface that extends radially outward toward an axial upper portion or a surface including an inclined surface. When the second end expansion portion 244 is formed of a surface including an inclined surface or an inclined surface, since the recessed surface of the reinforcement plate 100 formed thereby becomes a surface including an inclined surface or an inclined surface, the base hole 104 The upper edge of the can be specially chamfered (Chamfering) effect.

The third end extension 246 of the burring punch 240 extends in the axial direction from the second end extension 244, and the guide 248 is formed from the third end extension 246.

As shown in FIG. 9, the third end extension 246 forms an extension hole 107 over the recessed surface 106 formed on the base hole 104 of the reinforcement plate 100. Forming the extension hole 107 in the upper portion of the base hole 104 means that the recessed surface 106 is formed at a deeper point. As such, the depth of the extension hole 107 is determined according to the depth of the recessed surface 106, and the length of the third end extension 246 is also determined accordingly.

8, the thickness W between the outer diameter of the first stage punch part 242 and the maximum diameter of the second stage expansion part 244 is formed in the base hole 104. It is preferable to form thicker than the screw valley depth of the threaded portion 105 (see FIG. 8). Then when tapping the threaded portion 105 the tab tool is placed on the upper surface portion of the base hole 104 of the reinforcement plate 100, ie the surface portion of the reinforcement plate around the maximum diameter portion of the depression 106. In other words, it is possible to enter the recessed surface 226 and form a screw without causing interference with the surface portion of the reinforcing plate around the extension hole 107, and any thread is formed on the surface of the reinforcing plate above the base hole 104. It is possible to maintain a smooth surface state not formed.

In the burring process using the burring punch 240, the burring punch 240 and pressing from the time when the reinforcing plate 100 in which the preliminary hole 103a is drilled is transferred to the upper surface of the burring die 50 of the burring stage in the previous stage. The punch 250 begins with the lowering.

As shown in FIG. 9, the burring punch 240 descends while the descending pressing punch 250 press-forms the reinforcing plate 100 and continues to support it, and the burring punch 240 primarily. First end punch portion 242 presses around the preliminary hole 103a of the reinforcing plate 100 and expands and bends radially outwardly, such that the flange 102 and the base hole 104 having the inclined surface 103 at the tip portion thereof. ).

In addition, the upper circumferential edge portion of the base hole 104 of the reinforcement plate 100 is pressed and recessed by the second stage expansion part 244, so that the recessed surface 106 deeply inserted into the upper portion of the base hole 104 is provided. Next, the extension hole 107 is formed by the third end extension 246.

After performing a molding process including a burring process and the like, the reinforcing plate 100 is separated from the material by punching out the reinforcing plate 100 to the outer contour in a blanking stage (not shown).

When tapping is performed to the flange 102 of the reinforcement board 100 obtained in this way, as shown in FIG. 10, the threaded part 105 is formed in the inner diameter part of the base hole 104. As shown in FIG.

As shown in FIG. 10, an inclined surface 103 inclined inward is formed on the front end face of the flange 102 of the reinforcing plate 100, and as described above, the sharp surface is sharp from the front end face of the flange 102 when tapping. Threading out is prevented.

In addition, the recessed surface 106 which penetrated deeply inside is also previously formed also in the upper part of the base hole 104 of the reinforcement board 100. Thus, the tap tool begins to form a thread from the depression surface 106, which is located at a point deeply indented from the upper surface of the reinforcement plate 100, so that the depression surface 106 is in the middle of the tapping operation. Even if the phenomenon that the thread is pushed up to the upper surface of the) occurs, there is no fear that the pushed up thread is more protruding than the surface of the reinforcing plate 100.

In addition, when the depression surface 106 is made of an inclined surface, as shown in the 'B' portion and the enlarged portion in the magnifier display in FIG. 10, the projecting degree of the thread is formed small and low by the inclined depression surface 106, Due to the inclined recessed surface 106, the flesh of the thread is secured to the root portion of the thread to be supported by a large force, so that the amount of pushing up is much smaller than that of conventionally forming the thread at the rounded corner. Even if it is pushed up a lot, its root part is so thick that the rising angle is small and does not fall easily.

In addition, the tap tool is guided by the contact of the tip taper surface of the tap tool to the inclined surface at the beginning of the tap operation, whereby the center of the tap tool and the center of the base hole can be precisely aligned, and accordingly, the right angle of the thread portion 105 Can be formed satisfactorily. In addition, as described above, since the amount of thread pushing up to the surface is small and the rising angle is small, the tap tool receives less resistance, so that the right angle of the thread portion can be more precisely secured.

As described above, according to the present invention, in the burring process, the inclined surface 103 is formed in advance at the front end surface of the flange 102, and at the same time, the depression surface 106 is formed in advance in the upper corner of the foundation hole 104, thereby making the tap work. It is possible to prevent the phenomenon that the thread is pushed out or pushed up to the edge surface of the city foundation hole 104, thereby preventing the dropping of the protruding sharp thread, and also a separate chamfering process after either tap operation There is no need to carry out, and the machining precision of the screw portion is excellent.

In addition, the improved reinforcement plate 100 according to the present invention is installed in the oil filter in place of the reinforcement plate 20 shown in FIG. The mounting accuracy is good, and there is no generation of thread-falling particles, so that excellent quality without damage to the lubrication portion can be maintained.

In the above, specific embodiments of the present invention shown in the accompanying drawings have been described in detail, but these are merely illustrative of the preferred embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. In addition, the embodiments of the present invention as described above can be variously modified and equivalent other embodiments by those of ordinary skill in the art within the technical spirit of the present invention, such modifications and equivalent other embodiments are It belongs to the appended claims of the invention.

1 is a cross-sectional view of a general oil filter.

2 is a perspective view showing a reinforcing plate of an oil filter.

It is a figure which shows the process stage of the progressive mold apparatus for conventional reinforcement board press forming.

It is sectional drawing which shows the state after the tab process of the conventional reinforcement board, One side shows the state in which the thread part was formed by the tab process, and the other side was shown in the state before forming the thread part.

FIG. 5 is a view illustrating a state in which countersink processing is performed on the base hole of the reinforcing plate after the tapping operation in FIG. 4.

6 is a view showing a process stage of the progressive mold apparatus for reinforcing plate press molding according to the present invention.

7 is a cross-sectional view of a reinforcing plate manufactured according to the present invention, one side showing a threaded portion formed by tapping, and the other side is shown in a state before forming the threaded portion.

8 is a front view of a burring punch according to a preferred embodiment of the present invention.

9 is a view showing a state of forming a reinforcing plate with a burring punch according to the present invention.

It is sectional drawing which shows the state after the tab process of the reinforcement board which concerns on this invention, one side shows the state in which the thread part was formed by the tap process, and the other side was shown in the state before forming the thread part.

<Explanation of symbols for the main parts of the drawings>

2: drawing stage 4: piercing stage

6: burr removing stage 8: burring stage

10 housing 12 core

14 filter element 16 seaming cap

18: Packing

100: reinforcement plate 101: bottom surface

102 flange 102a inclined wall portion

103: inclined surface 103a: preliminary hole (piercing cutting surface)

104: base hole 105: threaded portion

106: recessed surface 107: extension hole

124: oil inlet hole

210, 310: Drawing Punch and Drawing Die

220, 320: Piercing Punch, Piercing Die

230, 330: punch for removing bur, die for removing bur

240, 340: Burring Punch, Burring Die

250: pressing punch

242: first stage punch portion 244: second stage expansion portion

246: third stage extension 248: guide

Claims (9)

A press device for drilling a preliminary hole in a reinforcing plate for oil filter and burring a base hole and a flange based on the preliminary hole, A drawing having a drawing punch 210 and a drawing die 310, for drawing and forming a container having a bottom portion 101 and an inclined wall portion 102a corresponding to the base hole 104 based on the raw material of the reinforcing plate 100. A stage 2; A piercing stage 4 having a piercing punch 20 and a piercing die 320 to pierce a portion of the bottom portion 101 and the inclined wall portion 102a adjacent to the bottom portion thereof to drill the preliminary hole 103a. )Wow; A burring punch 240 and a burring die 340 having a diameter larger than the preliminary hole 103a of the reinforcement plate 100 are provided, and the inclined wall portion 102a is pressed and expanded to bend the flange 102 and the base hole. And forming a 104, a burring stage 8 for changing the direction of the cut surface of the preliminary hole 103a to form an inclined surface 103 which enters inwardly from the tip of the flange 102. Press apparatus for manufacturing reinforcement plate of filter. The method of claim 1, The burring punch 240, A first end punch part 242 having a diameter larger than the preliminary hole 103a of the reinforcement plate 100 and pressing and expanding the periphery of the preliminary hole 103a to form the flange 102 and the base hole 104; , The second stage expansion portion (3) which extends an outer diameter from the first stage punch portion 242 to press the upper circumferential edge portion of the base hole 104 of the reinforcement plate 100 to form the recessed surface 106 during pressing. Press device for producing a reinforcing plate of the oil filter, characterized in that it comprises a (244). The method of claim 2, The second stage expansion part 244 includes an inclined surface extending radially outward from the first stage punching portion 242 toward the upper axial direction, and thus the recessed surface 106 having the inclined surface on the reinforcing plate 100 is provided. Press forming device for producing a reinforcement plate of the oil filter, characterized in that the forming. The method of claim 2, A third end extension 246 is formed in the axial direction from the second end extension 244 of the burring punch 240, and the third end extension 246 recesses the reinforcing plate 100. Press device for manufacturing a reinforcing plate of the oil filter, characterized in that the extension hole 107 is formed above the surface 106. The method of claim 2, The thickness W between the maximum diameter of the second stage expansion portion 244 and the outer diameter of the first stage punching portion 242 is the thread portion 105 to be formed in the base hole 104 of the reinforcing plate 100. Press device for manufacturing a reinforcing plate of the oil filter, characterized in that the thickness of the bone depth. As a reinforcing plate installed on the upper part of the oil filter and serving as an entrance and exit of the oil, and fastened to the equipment side, A flange 102 is formed in which the inner diameter extends downward by forming the base hole 104, A plurality of oil inlet holes 124 are formed around the base hole 104, An inclined surface 103 inclined inward is formed at the front end surface of the flange 102, Reinforcing plate for oil filter, characterized in that the threaded portion 105 is formed in the inner diameter portion of the base hole (104). The method of claim 6, In the upper portion of the base hole 104 of the flange 102, a recessed surface 106 of the shape extending in the axial direction from the upper peripheral edge portion of the base hole 104 of the flange 102 is Formed, The screw portion 105 is an oil filter reinforcement plate, characterized in that formed in the form of a shallow depth of the screw valley than the maximum diameter formed by the recessed surface (106). The method of claim 7, wherein An extension hole 107 of a shape in which the maximum diameter portion of the recessed surface 106 of the reinforcement plate 100 extends in the axial upper direction is further formed, and the recessed surface 106 is formed by the depth of the extension hole 107. The oil filter reinforcing plate, characterized in that formed in the deeper position. A container-shaped housing 10 having a core 12 installed therein, A filter element 14 disposed outside the core 12 and received inside the housing 10; The reinforcing plate 100 according to any one of claims 6 to 8 installed on the upper end of the housing 10 above the filter element 14, Oil filter, characterized in that it comprises a seaming cap (16) integrally coupled to the housing (10) on the upper surface of the reinforcing plate (100).

Images