KR102181814B1 - Manufacturing method and mold of support ring for dust cover with improved inner diameter deformation - Google Patents

Abstract

The present invention relates to a method for manufacturing a support ring for a dust cover with improved inner diameter deformation, capable of minimizing the deformation of an internal diameter by conducting a process, in which the deformation of an internal diameter can occur, in advance during the procedure of manufacturing a support ring with a press mold and leading a piercing process for determining an inner diameter to be carried out right before a trimming process, and a manufacturing mold. In other words, the method includes: a first piercing process of piercing a hole in the center with a first piercing punch provided in an upper block while moving a band-shaped flat panel in a longitudinal direction, and discharging a cut piece through a first discharge hole formed in a lower block by piercing a molding hole on an outer circumference with a molding punch provided in the upper block; a first bending process of forming an uneven piece near the hole pierced with the first piercing punch and forming an outer wall of a support ring near an edge by using a first bending core provided in the lower block and a first bending punch provided in the upper block; a second bending process of bending the uneven piece, formed in the first bending process, upwards by using a second bending punch provided in the upper block and a second bending core provided in the lower block; a second piercing process of forming an uneven part on the upwards bent uneven piece by using a second piercing punch provided in the upper block and a second piercing core provided in the lower block; and a trimming process of cutting an upper part of the outer wall of the support ring formed in the first bending process by using a trimming punch provided in the upper block and a third discharge hole provided in the lower block.

Description

Manufacturing method and mold of support ring for dust cover with improved inner diameter deformation {Manufacturing method and mold of support ring for dust cover with improved inner diameter deformation}

The present invention relates to a manufacturing method and a mold for manufacturing a support ring for a dust cover with improved inner diameter deformation, and more specifically, prior to a process in which deformation of the inner diameter may occur in the process of manufacturing the support ring with a press mold, and the inner diameter dimension It is intended to provide a manufacturing method and a manufacturing mold for a support ring for a dust cover with improved inner diameter deformation so that the determined piercing process can be performed immediately before the trimming process, thereby minimizing the deformation of the inner diameter.

In automobiles, a ball joint combined with a lower arm configured in various forms is applied. A dust cover is applied to the upper part of these ball joints as a means to prevent oil from lubricating grease and inflow of foreign substances into the interior, and to extend the life of the ball joint.

As a representative example of the above dust cover, a tie rod end dust cover of Korean Patent Laid-Open No. (A) 10-2007-0060382 (2007.06.13) is disclosed, and other examples are Korean Patent Publication (A) 10- 2014-0086633 (2014.07.08.) ball joint dust cover of the steering system for vehicles.

The dust cover is made of a ring-shaped steel insert in order to improve the holding power while increasing the gripping force with the contact surface at the upper and lower portions.

In the case of the above-described ring-shaped steel (supporting ring), as shown in Figs. 1 and 2, the outer wall is formed vertically on the outer periphery, and it is bent upward at the lower end of the outer wall, and the uneven portion is formed at the tip of the rubber material. It is designed to be easily combined with the cover body.

Meanwhile, in the case of the ring-shaped steel (supporting ring) used for the dust cover, it is manufactured by a press mold, and preferably the first piercing punch in the center while moving the strip-shaped plate-shaped panel in the longitudinal direction as shown in FIG. A first piercing step of drilling a hole with a furnace and punching a forming hole with a forming punch in the outer periphery; A first bending step of forming an uneven piece toward the hole formed by the first piercing punch and forming an outer wall of the support ring toward an edge thereof; A second piercing step of forming a hole for concave-convex shaping in a playing shape to form the concave-convex portion on the concave-convex piece formed by the first bending process; A third piercing step of forming an uneven portion by cutting along the uneven forming hole formed by the second piercing step; A second bending step of bending the uneven portion formed by the third piercing step upward; It is manufactured by a trimming process of cutting the upper end of the outer wall of the support ring formed in the first bending process.

In the case of the manufacturing method and the manufacturing mold for the manufacturing method described above, deformation of the inner diameter occurs in the second bending process and the second bending process.

This will be described with reference to FIG. 10, in the first bending process, the portion A has less flesh and is easily pulled, and the portion B is relatively pulled out due to the force on the edge side, thereby generating an ellipse primarily.

In this state, there is no significant change in the inner diameter until the second piercing process and the third piercing process, but the deformation of the inner diameter occurs again in the second bending process.

That is, since an ellipse is generated in the first bending process and a true circle is formed in the second bending process, the uneven portion is formed in the state where the ellipse is generated, and the inner diameter is deformed as the true circle is formed in this state. There was a problem of deterioration.

KR 1020070060382 A 2007.06.13. KR 1020140086633 A 2014.07.08.

Therefore, the inventors of the present invention in the manufacturing process of forming the support ring for the conventional dust cover, when the first bending, the second piercing, the third piercing, and the second bending are performed in the order of the first piercing, an elliptical deformation occurs in the first bending. In order to improve the problem that the inner diameter is deformed even in the process of forming a true circle in the second bending while the shape of the inner diameter is changed again in the second and third piercings, the present invention has been researched and developed.

That is, in the present invention, the second piercing process of determining the inner diameter dimension can be performed immediately before the trimming process in a state prior to the first bending and second bending processes that may cause deformation of the inner diameter during the manufacturing of the support ring with a press mold. The present invention was completed with the technical problem of the invention in providing a method for manufacturing a support ring for a dust cover and a manufacturing mold with improved inner diameter deformation so that the inner diameter dimension deformation can be minimized.

As a means of solving the problem, in the present invention, while moving the strip-shaped panel in the longitudinal direction, a hole is drilled in the center with a first piercing punch provided in the upper block, and a forming hole is formed in the outer periphery with a molding punch provided in the upper block. A first piercing process for discharging the cut material through a first discharge hole formed in the lower block by drilling; The first bending to form an uneven piece toward the hole formed by the first piercing punch using the first bending punch provided in the upper block and the first bending core provided in the lower block and forming the outer wall of the support ring toward the edge Process; A second bending step of bending upwardly the uneven piece formed in the first bending step by using a second bending punch provided in the upper block and a second bending core provided in the lower block; A second piercing step of forming a concave-convex portion in the concave-convex piece bent upward using a second piercing punch provided in the upper block and a second piercing core provided in the lower block; It is characterized in that it is manufactured by a trimming process of cutting the upper end of the outer wall of the support ring formed in the first bending process using a trimming punch provided in the upper block and a third discharge hole provided in the lower block.

In addition, in the present invention, the base plate and; A lower plate supported by a plurality of ribs above the base plate; An upper plate facing the lower plate; Lower blocks stacked on the upper side of the lower plate; It is configured to include upper blocks stacked on the lower side of the upper plate;

A first piercing punch installed in the upper block and a first discharge hole formed in the lower block for the first piercing process; A first bending punch installed in the upper block and a first bending core installed in the lower block for the first bending process; A second bending punch installed in the upper block and a second bending core installed in the lower block for the second bending process; A second piercing punch installed in the upper block for the second piercing process, a second piercing core installed in the lower block, and a second discharge hole; For the trimming process, a trimming punch installed in the upper block and a third discharge hole formed in the lower block are sequentially applied so that the manufacturing method of claim 1 can be achieved.

According to the manufacturing method and manufacturing mold of the support ring for a dust cover with improved inner diameter deformation provided by the present invention, the first bending and the second bending process that may cause deformation of the inner diameter in the process of manufacturing the support ring with a press mold are preceded. In one state, by allowing the second piercing process to determine the inner diameter dimension to be performed immediately before the trimming process, there is an effect of minimizing the deformation of the inner diameter dimension.

Therefore, it is possible to provide a high-quality support ring by minimizing the process in which the inner diameter is deformed in the process of manufacturing the support ring.

1 is a perspective view showing the appearance of a support ring for a dust cover with improved inner diameter deformation manufactured by the present invention
Figure 2 is a front cross-sectional view of Figure 1
3 is a block diagram according to a method of manufacturing a support ring for a dust cover with improved inner diameter deformation provided by the present invention
Figure 4 is a perspective view showing a state in which a support ring for a dust cover with improved inner diameter deformation is manufactured according to the manufacturing method of the present invention
5 is a cross-sectional view of FIG. 4
6 is a cross-sectional view of a manufacturing mold for manufacturing a support ring for a dust cover with improved inner diameter deformation provided by the present invention
7 is a bottom view of the upper plate in FIG. 6
8 is a plan view of the lower plate in FIG. 6
9 is a plan view showing a state in which a support ring for a dust cover is manufactured according to a conventional manufacturing method
10 is an enlarged view showing a portion where deformation occurs while a support ring for a dust cover is manufactured according to a conventional manufacturing method

Hereinafter, a method of manufacturing a support ring for a dust cover with improved inner diameter deformation provided by the present invention and a preferred embodiment of a manufacturing mold will be described with reference to the accompanying drawings.

1 is a perspective view showing the outer shape of a support ring for a dust cover with improved inner diameter deformation manufactured by the present invention, and FIG. 2 is a front cross-sectional view of FIG.

The support ring 100 for a dust cover manufactured according to the present invention has an outer wall 110 formed perpendicularly to the outer periphery as shown, and the uneven piece 120 is bent upwardly from the lower end of the outer wall 110 inwardly. , It is a configuration in which the uneven portion 130 is formed at the tip of the uneven piece 120

The support ring 100 is insert-coupled to the upper and lower ends of the dust cover made of a rubber material, respectively, and the bonding force with the rubber is increased by the uneven portion 130 formed on the uneven piece 120.

In the case of the support ring 100 for a dust cover as described above, it is a product that requires roundness while being manufactured with a thin steel plate.

3 is a block diagram illustrating a method for manufacturing a support ring for a dust cover with improved inner diameter deformation provided by the present invention, and FIG. 4 is a support ring for a dust cover with improved inner diameter deformation according to the manufacturing method of the present invention. A plan view showing a state of being manufactured, FIG. 5 is a cross-sectional view of FIG. 4.

As mentioned above, the support ring 100 for a dust cover of the present invention is manufactured by a plurality of processes by inserting the strip-shaped plate panel 200 into the manufacturing mold 1 (steel plate press mold).

Preferably, a first piercing step (S10), a first bending step (S20), a second bending step (S30), a second piercing step (S40), and a trimming step (S50) are performed.

Each process will be described in more detail below.

In the first piercing process (S10), a strip-shaped thin plate-like panel 200 is inserted into the manufacturing mold 1, and a hole 210 is drilled at the center with a first piercing punch 11, and a molding punch is performed at the outer periphery. This is a step of drilling the forming hole 220 with (13). The forming hole 220 perforated by the forming sponge is formed in the width direction, and is formed in a circular shape having a diameter larger than the outer diameter of the support ring 100.

The first bending process (S20) is a process of forming the uneven piece 120 toward the central hole 210 and forming the outer wall 110 at the edge of the support ring 100.

The second bending process S30 is a process of bending the uneven piece 120 formed as described above upward. Preferably, the uneven piece 120 may be bent with the upper plate 6 to match the design angle based on the lower end of the outer wall 110 formed at the edge of the support ring 100.

The second piercing step (S40) is a process of forming the uneven portion 130 in a waveform on the uneven piece 120. It is natural that the uneven portion 130 can be deformed into various shapes.

The trimming process (S50) is a process of completing the support ring 100 in a state in which the uneven portion 130 is formed on the uneven piece 120 while the outer wall 110 and the uneven piece 120 are bent in the plate panel. The upper end of the outer wall 110 of the support ring 100 formed in the first bending process S20 is cut.

6 is a cross-sectional view of a manufacturing mold for manufacturing a support ring for a dust cover provided in the present invention, FIG. 7 is a bottom view of the upper plate in FIG. 6, and FIG. 8 is a plan view of the lower plate in FIG. 6 I did it.

This shows a manufacturing mold (1) for manufacturing the support ring 100 for a dust cover provided in the present invention.

As shown in the figure, the lower plate 4 supported by the plurality of ribs 3 is disposed above the base plate 2 as in the configuration of a general iron plate press mold, and the upper plate facing the lower plate 4 (6) is provided, and lower blocks 5 are stacked on the upper side of the lower plate 4, and upper blocks 7 are stacked on the lower side of the upper plate 6.

A first piercing step (S10), a first bending step (S20), and a second bending step (S30) of manufacturing the support ring 100 for the dust cover on the manufacturing mold 1 having the basic configuration as described above, The punches and cores required for the second piercing step (S40) and the trimming step (S50) are sequentially arranged so that the work can be carried out step by step while raising and lowering in a batch.

For the first piercing process (S10), the first piercing punch 11 installed on the upper block 7 is fixed with a fixing bolt, and the lower block 5 is positioned under the first piercing punch 11. The first discharge hole 12 is formed, and when the first piercing punch 11 is lowered toward the first discharge hole 12, the hole 210 is drilled by the first piercing punch 11 in the center. , The molding hole 220 is perforated by the molding punch 13 at the outer periphery, and the cut is discharged through the first discharge hole 12.

For the first bending process (S20), the first bending punch 21 is installed on the upper block 7 as a fixing bolt, and the first bending core 22 is installed on the lower block 5 as a fixing bolt. As one thing, when the first bending punch 21 descends toward the first bending core 22, an uneven piece 120 is formed toward the central hole 210 between them, and the support ring 100 is formed at the edge. The outer wall 110 is formed.

For the second bending process (S30), a second bending punch 31 is installed on the upper block 7 as a fixing bolt, and a second bending core 32 is installed on the lower block 5 as a fixing bolt. As a result, when the second bending punch 31 descends, the concave-convex piece 120 on which the concave-convex portion 130 is to be formed between the second bending punch 31 and the second bending core 32 is moved upward. Organize to bend.

For the second piercing process (S40), the second piercing punch 41 is fixed to the upper block 7 with a fixing bolt, and a second piercing core 42 installed on the lower block 5 is installed, and The second discharge hole 43 is formed, which forms the concave-convex portion 130 on the concave-convex piece 120 when the second piercing punch 41 descends, and the cut material is transferred to the second discharge hole 43. It is a configuration to be discharged.

For the trimming process (S50), a trimming punch 51 is installed in the upper block 7 with a fixing bolt, and a third discharge hole 52 is formed in the lower block 5.

This is a configuration in which when the trimming punch 51 descends, the completed support ring 100 is cut and discharged through the third discharge hole 52.

According to the manufacturing method and manufacturing mold 1 of the support ring 100 for a dust cover as described above, the first bending and the second bending, which may cause deformation of the inner diameter in the process of manufacturing the support ring 100 with a press mold. Since the bending process (S20) (S30) is preceded, the second piercing process (S40) of forming the uneven portion (130) can be performed immediately before the trimming process (S50), so that the deformation of the inner diameter can be minimized. Therefore, in the process of manufacturing the support ring 100, the process in which the inner diameter is deformed is minimized to provide the support ring 100 of high quality.

That is, in the present invention, in the first bending process (S20) as shown in FIG. 10, the part A is pulled easily due to the small amount of flesh, and the part B is relatively pulled less because of the force on the edge side, so that the second bending in the state in which the ellipse is primarily generated. The process (S30) is formed immediately to form the concave-convex piece 120 to form the concave-convex portion 130 through the second piercing process (S40) in a state in which the inner diameter is determined in a true circle state. ) Of the inner diameter dimension and shape deformation (ellipse) can be minimized.

In the detailed description of the present invention, specific embodiments are described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of protection of the present invention should not be defined by being limited to the described embodiments, and should not be determined by the claims to be described later as well as equivalents.

1: Manufacturing mold 2: Base plate
3: Rib 4: Bottom plate
5: Lower block 6: Upper plate
7: upper block 11: first piercing punch
12: 1st discharge hole 13: Molding punch
21: first bending punch 22: first bending core
31: second bending punch 32: second bending core
41: second piercing punch 42: second piercing core
43: second discharge hole 51: trimming punch
52: 3rd discharge hole
100: (for dust cover) support ring 110: outer wall
120: irregularities 130: irregularities
200: plate panel 210: hole
220: molding hole
S10: first piercing step S20: first bending step
S30: second bending process S40: second piercing process
S50: Trimming process

Claims (2)

While moving the strip-shaped plate panel 200 in the longitudinal direction, a hole 210 is drilled in the center with the first piercing punch 11 provided in the upper block 7, and for molding provided in the upper block 7 A first piercing step (S10) of perforating a forming hole 220 in the outer periphery with a punch 13 and discharging the cut material into the first discharge hole 12 formed in the lower block 5;
The uneven piece toward the hole formed by the first piercing punch 11 by using the first bending punch 21 provided in the upper block 7 and the first bending core 22 provided in the lower block 5 A first bending step (S20) of forming 120 and forming the outer wall 110 of the support ring 100 toward the edge;
The uneven piece 120 formed in the first bending process (S20) using the second bending punch 31 provided in the upper block 7 and the second bending core 32 provided in the lower block 5 A second bending step (S30) of bending upward;
Using the second piercing punch 41 provided in the upper block 7 and the second piercing core 42 provided in the lower block 5, the concave-convex portion 130 is formed on the uneven piece 120 bent upward. Forming a second piercing step (S40);
The upper end of the outer wall 110 of the support ring 100 formed in the first bending process (S20) using the trimming punch 51 provided in the upper block 7 and the third discharge hole provided in the lower block 5 A method of manufacturing a support ring for a dust cover with improved inner diameter deformation, characterized in that it is manufactured by a trimming process (S50) of cutting.
A base plate 2; A lower plate (4) supported by a plurality of ribs (3) above the base plate (2); An upper plate 6 facing the lower plate 4; Lower blocks (5) stacked on the upper side of the lower plate (4); It is configured to include upper blocks 7 stacked on the lower side of the upper plate 6;
A first piercing punch (11) installed in the upper block (7) for a first piercing process and a first discharge hole (12) formed in the lower block (5);
A first bending punch 21 installed in the upper block 7 and a first bending core 22 installed in the lower block 5 for the first bending process;
A second bending punch 31 installed in the upper block 7 and a second bending core 32 installed in the lower block 5 for the second bending process;
A second piercing punch 41 installed in the upper block 7 for a second piercing process, a second piercing core 42 installed in the lower block 5, and a second discharge hole 43;
Including that the trimming punch 51 installed in the upper block 7 and the third discharge hole 52 formed in the lower block 5 are sequentially applied to achieve the manufacturing method of claim 1 for the trimming process. A mold for manufacturing a support ring for a dust cover with improved inner diameter deformation, characterized in that.

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