KR101342902B1 - Device for manufacturing upper case of abs unit for a vehicle - Google Patents

Abstract

The present invention relates to a device for manufacturing an upper case for the ABS unit of a vehicle to prevent the inner surface of a die bush and the outer surface of a cylinder from being scratched when the cylinder inserted into the die bush is escaping from the die bush due to pressure from a lower punch by tapering the inner surface of the die bush from one end where a steel sheet is inserted to the other end to expand the inner diameter of the die bush. In other words, the present invention improves process efficiency and reduces manufacturing costs by eliminating a grinding step for the surface of the cylinder in comparison with existing manufacturing processes which include post-processing steps.

Description

Manufacturing apparatus of upper case for car ABS unit {DEVICE FOR MANUFACTURING UPPER CASE OF ABS UNIT FOR A VEHICLE}

The present invention relates to an apparatus for manufacturing an upper case for a car ABS unit.

In general, an anti-lock brake system (ABS) unit of a vehicle detects when a wheel slip occurs during braking of the vehicle and repeatedly increases or decreases the wheel brake pressure to prevent a risk of slipping of the wheel. The brake system of the Republic of Korea, Republic of Korea Patent Nos. 10-0799491, 10-0311154 and 10-0345106 and the like has been presented ABS related technology.

The ABS unit for adjusting the brake pressure of the wheel includes an electronic control device such as a microcontroller, and a cylindrical upper case is installed inside the ABS unit to protect a plurality of connection terminals.

Conventionally, a drawing apparatus which sequentially presses a predetermined steel sheet with a plurality of punches has been used to manufacture a cylindrical upper case. That is, the conventional drawing device presses the steel sheet to a die having a constant depth and diameter to form a cylindrical shape, and after separating the cylinder from the die, press the steel sheet again to another die to adjust the diameter of the cylinder gradually to upper The case was prepared.

However, in the conventional drawing apparatus, a cylinder is formed by pressing a steel sheet on a die, and friction occurs between the inner circumferential surface of the die and the outer circumferential surface of the cylinder in the process of forcibly separating the made cylinder from the die, so that scratches are formed on the surface of the cylinder. there was.

As a result, in the conventional drawing apparatus, after the drawing process is completed due to the scratches generated on the outer circumferential surface of the cylinder during drawing processing, the post-processing to remove scratches by grinding the surface of the cylinder is additionally required, thereby reducing the process efficiency and manufacturing cost. There was a rising disadvantage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to provide a technique for preventing scratches that may occur on the surface of an upper case between manufactures of upper cases for an automobile ABT unit and efficiently manufacturing the upper case. .

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

In order to achieve this object, in one aspect of the present invention, an apparatus for manufacturing an upper case for an automotive ABS unit includes a notching die for removing a portion of a steel sheet; A drawing mold which sequentially presses one surface of the steel sheet passing through the notching mold to form a cylinder; A piercing mold for drilling at least one hole in the bottom of the cylinder; And a trimming mold for separating the cylinder punched by the piercing mold from the steel sheet. It includes, The drawing mold comprises a plurality of drawing punch for pressing the outer peripheral surface of the steel sheet in one direction; A drawing die for supporting the steel sheet under the steel sheet; And a plurality of die bushes having a hollow cylindrical shape for inserting the steel sheet pressed by the drawing punch, and coupled to the inside of the drawing die. Including, the inner circumferential surface of the at least one die bush may be formed to be tapered so that the inner diameter is extended toward the other end in the direction in which the steel sheet is inserted.

In addition, the taper inclination of the inner peripheral surface of the die bush may be formed to 1 ° to 3 °.

In addition, one end of the die bush may have an inclined surface inclined downward in the insertion direction of the steel sheet.

Here, the inclined surface is an inclined portion inclined at a predetermined angle from the central axis of the die bush; A first curvature portion extending from one end of the inclined portion to be in contact with the steel sheet before being pressed by the drawing punch and formed round; And a second curvature portion extending from the other end of the inclined portion and having a curvature greater than that of the first curvature portion. . ≪ / RTI >

The drawing mold may further include: a protrusion forming punch in which one or more protrusions are formed to press one surface of the steel sheet to form at least one groove; As shown in FIG.

On the other hand, the piercing mold is a fixing bush provided for introducing the cylinder formed from the drawing mold; A piercing punch for forming a piercing hole in a bottom of a cylinder introduced into the fixing bush; And a heating plate connected to one side of the fixing bush and supplying heat to the fixing bush so that the temperature of the surface of the cylinder increases. . ≪ / RTI >

As described above, according to the present invention, the inner circumferential surface of the die bush is tapered so that the inner diameter of the die bush is tapered so that the inner diameter of the die bush is extended from one end into which the steel sheet is inserted. When the die bush is released by pressurization, scratches do not occur between the inner circumferential surface of the die bush and the outer circumferential surface of the cylinder.

That is, in the present invention, since the step of grinding the surface of the cylinder is omitted, the process efficiency is increased and the manufacturing cost is reduced as compared with the conventional manufacturing process including the post-processing step.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 illustrates an apparatus for manufacturing an upper case for an automobile ABS unit according to an exemplary embodiment of the present invention.
Figure 2 illustrates a process for manufacturing the upper case for the car ABS unit according to an embodiment of the present invention.
Figure 3 illustrates a lower portion of the projection forming punch according to an embodiment of the present invention.
4 is a cross-sectional view of the first die bush according to the embodiment of the present invention.
5 is a cross-sectional view of a fourth die bush according to an embodiment of the present invention.
Figure 6 shows the completed shape of the upper case for a car ABS unit according to an embodiment of the present invention.
7 is a flowchart illustrating a manufacturing method of an upper case for a car ABS unit according to an embodiment of the present invention.
8 is a flowchart illustrating a drawing step according to an embodiment of the present invention.
9 is a flowchart illustrating a piercing step according to an embodiment of the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for simplicity of explanation.

<Description of Configuration>

The apparatus 10 for manufacturing an upper case for an automotive ABS unit according to the present invention may include a notching mold 100, a drawing mold 200, a piercing mold 300, and a trimming mold 400. This will be described with reference to FIGS. 1 to 6.

As shown in FIG. 1, the apparatus 10 for manufacturing an upper case for an automobile ABS unit includes a notching mold 100, a drawing mold 200, a piercing mold 300, and trimming from a side from which a steel plate 500 is supplied. As the mold 400 is installed in sequence, the steel sheet 500 which is supplied stepwise by a continuous and constant pitch is processed to finally manufacture a cylindrical upper case U as shown in FIG. 6.

Hereinafter, each mold will be described in more detail, but the description of the conventional mold structure and operation will be omitted for convenience.

The notching die 100 removes a portion of the remaining area not used in the manufacture of the upper case U among the entire area of the steel sheet 500. That is, the notching region S having a predetermined shape is removed from the steel sheet 500 by using the upper punches 110 and 120 and the lower punches 130 and 140.

The drawing mold 200 sequentially presses one surface of the steel sheet 500 passing through the notching mold 100 to form a cylinder. In one embodiment of the present invention, the drawing mold 200 is subdivided into four steps, but is not necessarily limited thereto, and various modifications may be made according to the design purpose of those skilled in the art.

The drawing mold 200 may include a plurality of drawing punches 220, 230, 240, 250, a drawing die 205, a plurality of die bushes 260, 270, 280, 290, and a protrusion forming punch 210. have. The plurality of drawing punches 220, 230, 240, and 250 descend and press the outer circumferential surface of the steel sheet 500 so that the steel sheet 500 is drawn into the die bushes 260, 270, 280, and 290.

The drawing die 205 supports the steel sheet 500 at the lower side of the steel sheet 500, and a fastening hole for coupling the plurality of die bushes 260, 270, 280, and 290 is formed inside the drawing die 205. do.

The plurality of die bushes 260, 270, 280, and 290 correspond to the plurality of drawing punches 220, 230, 240, and 250 in the vertical direction, respectively, and are formed by the drawing punches 220, 230, 240, and 250. The pressed steel sheet 500 has a hollow cylindrical shape for insertion.

When the steel sheet 500 that has passed through the notching die 100 is formed into a final shape at one time, excessive pressure may be applied to the steel sheet 500 to cause the steel sheet 500 to be torn or broken. Accordingly, the plurality of drawing punches are subdivided into the first drawing punch 220, the second drawing punch 230, the third drawing punch 240, and the fourth drawing punch 250, and the plurality of die bushes are divided into the first die. The steel sheet 500 is subdivided into a bush 260, a second die bush 270, a third die bush 280, and a fourth die bush 290 so that the steel sheet 500 is separated from the first die bush 260 by the fourth die bush 290. It is preferable to perform step forming so that the inner diameter of the cylinder becomes smaller as it proceeds to).

Here, the inner diameter of the fourth die bush 290 extends from the one end of the upper side into which the steel sheet 500 is inserted toward the other end of the lower side. That is, the inner circumferential surface of the fourth die bush 290 may be formed to be tapered, and the taper inclination of the inner circumferential surface may be formed to be 1 ° to 3 ° based on the longitudinal central axis of the fourth die bush 290.

If the taper inclination of the inner peripheral surface is less than 1 °, when the cylinder introduced into the fourth die bush 290 leaves the fourth die bush 290 by the lower punch, the inner peripheral surface of the fourth die bush 290 and the cylinder The friction occurs between the outer circumferential surface of the scratches occur on the outer circumferential surface of the cylinder, if the taper inclination of the inner circumferential surface exceeds 3 °, it is difficult to process the diameter of the cylinder uniformly, it is preferable to be carried out within the above-mentioned range.

On the other hand, the upper end of the first die bush 260 has an inclined surface inclined downward in the insertion direction of the steel sheet 500, the inclined surface is formed as a curved surface having a curvature. The inclined surface of the curved surface may be generated due to excessive pressure on the upper side of the first die bush 260 when a part of the steel sheet 500 is drawn into the first die bush 260 by pressing the first drawing punch 220. The shear stress of the steel sheet 500 is reduced to have an effect of preventing damage to the steel sheet 500.

In addition, the upper end of the fourth die bush 290 has a slope inclined downward in the insertion direction of the steel plate 500, the slope of the fourth die bush 290 is constant from the central axis of the fourth die bush 290 A first curvature portion (R2) and a second curvature portion (R3) extending at both ends of the inclined portion 291 and the inclined portion 291 inclined at an angle.

The angle formed between the central axis of the fourth die bush 290 and the inclined portion 291 is excessive when the steel plate 500 is introduced into the fourth die bush 290, above the fourth die bush 290. The shear stress of the steel sheet 500 may be reduced due to the pressure to prevent damage to the steel sheet 500, the angle range is preferably 20 ° ~ 40 °.

If the angle between the central axis of the fourth die bush 290 and the inclined portion 291 is less than 20 °, the surface of the steel sheet 500 when the steel sheet 500 is drawn into the fourth die bush 290. The frictional force is largely formed, there is a risk of surface damage, if it exceeds 40 ° because the rate of shear stress reduction of the steel sheet 500 may be lowered, it is preferably carried out within the above-mentioned range, more preferably An angle between the central axis of the four die bush 290 and the inclined portion 291 may be formed at 30 degrees.

The first curvature portion R2 extends at one end of the inclined portion 291 so as to contact the steel sheet 500 before pressing the steel sheet 500 by a drawing punch, and is rounded.

The second curvature portion R3 extends at the other end of the inclined portion 291 and has a constant curvature. As the inlet of the fourth die bush 290 becomes narrower from the first curvature portion R2 toward the second curvature portion R3, the stress of the steel sheet 500 that is pressed into the fourth die bush 290. Is increased when contacting the second curvature R3 than when contacting the first curvature R2.

In this case, when the steel sheet 500 enters the fourth die bush 290 by forming the curvature of the second curvature R3 to be 2 to 6 times larger than the curvature of the first curvature R2. The frictional force with the inner circumferential surface of the fourth die bush 290 may be reduced, and scratches that may occur on the surface of the steel sheet 500 due to friction may be reduced.

If the curvature of the second curvature portion R3 is less than twice the curvature of the first curvature portion R2, the frictional force reduction effect is not great, and even if it exceeds 6 times, the frictional force reduction effect is boiling, so the above-mentioned range It is preferable to make it within.

One or more protrusions 211 are formed on one surface of the protrusion forming punch 210 to press one surface of the steel sheet 500 to form at least one groove H. In the drawing process, the press forming punch 210 may be twisted or distorted by the pressing of the plurality of drawing punches, thereby reducing the productivity and the processing accuracy of the product. Before the drawing process starts, a plurality of grooves H are formed on one surface of the steel sheet 500 by pressing a portion of the steel sheet 500. That is, the protrusion forming punch 210 may disperse the stress acting on the steel sheet 500 during the drawing process, thereby preventing the steel sheet 500 from twisting, and improving the quality of the product.

The piercing mold 300 drills at least one hole in the bottom surface of the cylinder formed through the drawing mold 200. The piercing mold 300 may include a plurality of fixing bushes 391, piercing punches 350, 360, 370, and 380, and a heat generating plate 390.

The fixing bush 391 is provided to fix the position by drawing the cylinder formed from the drawing mold 200, and the piercing punch 350 is a piercing hole 292 to the bottom of the cylinder introduced into the fixing bush 391. To form. The piercing hole 292 is formed for assembly with the peripheral parts and can drill a plurality of holes as necessary.

The heat generating plate 390 is connected to one side of the fixing bush 391, and supplies heat to the fixing bush 391 so that the surface temperature of the cylinder introduced into the fixing bush 391 increases. The mold control unit (not shown) that controls the operation of each mold has a temperature of the fixing bush 391 through a temperature sensor (not shown) installed on the other side of the fixing bush 391 when the heating plate 390 operates. When the temperature of the fixing bush 391 rises above the predetermined temperature, the piercing punch controls to pierce the piercing hole on the bottom of the cylinder.

That is, since the surface of the cylinder is heated by the heating plate 390 before the piercing hole is formed on the bottom of the cylinder, piercing is easy, and cracks or breakage that may occur around the piercing hole between piercing operations can be prevented. .

The trimming mold 400 separates the cylinder in which the piercing hole is punctured by the piercing mold 300 from the steel plate 500, and the cylinder passing through the trimming mold 400 has an upper case U as shown in FIG. It has a final shape as.

<Description of Method>

A method of manufacturing an upper case for an automobile ABS unit according to the present invention will be described with reference to the flowchart shown in FIG. 7 and with reference to the drawings shown in FIGS. The step-by-step process is labeled as A (notching step), B (drawing step), C (piercing step), D (trimming step) in FIGS.

1.Notching step <S701>

In this step, the steel sheet 500 is transferred to the notching mold 100, and a process of removing a portion of the steel sheet 500 by pressing the upper punches 110 and 120 and the lower punches 130 and 140 is performed. .

2. Protrusion forming step <S702>

In this step, the protrusion forming punch 210 pressurizes one surface of the steel sheet 500 that has passed through the notching mold 100 in step S701 to form at least one groove H in the steel sheet 500.

3. Drawing step <S703>

The steel sheet 500 of which step S702 is completed is performed by the first drawing punch 220, the second drawing punch 230, the third drawing punch 240, and the fourth drawing punch 250. One surface is pressurized sequentially, and the steel plate 500 is a cylinder which matches the inner diameter of each of the first die bush 260, the second die bush 270, the third die bush 280, and the fourth die bush 290. Machining takes place in the shape of.

3-1. First drawing step <S703A>

The first drawing punch 220 presses the outer circumferential surface of the steel sheet 500 located above the first die bush 260 toward the first die bush 260, and one surface of the steel sheet 500 is the first die bush 260. Once drawn into the inner circumferential surface of the crankshaft, a cylindrical shape matching the inner diameter of the first die bush 260 is formed. The lower punch 201 presses and raises the cylinder so that the cylinder in close contact with the inner circumferential surface of the first die bush 260 is separated outward.

3-2. Second drawing step <S703B>

The cylinder formed in step S703A is inserted into the second die bush 270 by the second drawing punch 230. Thereafter, the cylinder in close contact with the inner circumferential surface of the second die bush 270 is separated by the lower punch 202.

3-3. Third drawing step <S703C>

The cylinder formed in step S703B is inserted into the third die bush 280 by the third drawing punch 240, and then the inner peripheral surface of the third die bush 280 by the lower punch 203. The cylinder in close contact with the outside is separated to the outside and moves above the fourth die bush 290.

3-4. Fourth drawing step <S703D>

The cylinder formed in step S703C is inserted into the fourth die bush 290 by the fourth drawing punch 250 to form a cylinder having an inner diameter smaller than that of step S703C, and the formed cylinder is formed by the lower punch 204 by the fourth. It is separated from the diebush 290.

In this step, the fourth die bush 290 is tapered so that the inner circumferential surface of the fourth die bush 290 is tapered so that the inner diameter expands from one end into which the steel plate 500 is inserted into the other end direction. A minute gap occurs between the inner circumferential surface of 290 and the outer circumferential surface of the cylinder.

That is, in this step, when the cylinder introduced into the fourth die bush 290 leaves the fourth die bush 290 by the lower punch 204, the inner peripheral surface of the fourth die bush 290 and the outer peripheral surface of the cylinder are separated. By minimizing friction, the possibility of scratching the surface of the cylinder can be prevented.

4. Piercing step <S704>

In this step, the piercing mold 300 drills at least one hole in the bottom surface of the cylinder formed in step S703, and this step may be subdivided into a heat generation step and a drilling step.

4-1. Fever step <S704A>

When the cylinder formed in step S703D enters the fixing bush 391 by the upper punch 310, the heat generating plate 390 supplies heat to the fixing bush 391 so that the surface temperature of the introduced cylinder increases.

4-2. Drilling step <S704B>

After step S704A, the process of forming the one or more piercing holes in the bottom surface of the cylinder by the piercing punch 350 proceeds. In one embodiment, when the heating plate 390 is operated in step 704A, the mold control unit checks the temperature of the fixing bush 391 through a temperature sensor installed on the other side of the fixing bush 391, and the temperature is higher than the predetermined temperature. As a result, when the temperature of the fixing bush 391 rises, the piercing punch 350 can be controlled to drill the piercing hole on the bottom of the cylinder.

5. Trimming step <S705>

In this step, the trimming mold 400 separates the cylinder drilled in step S704B from the steel plate 500. When the step is completed, the upper case U having the final shape as shown in FIG. 6 is manufactured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. And the scope of the present invention should be understood as the following claims and their equivalents.

10: manufacturing apparatus of upper case for automobile ABS unit
100: notching mold
110, 120: upper punch
130, 140: lower punch
150: die
200: drawing mold
201, 202, 203, 204: lower punch
205: Drawing Die
210: protrusion forming punch
211: projection
220: first drawing punch
230: second drawing punch
240: third drawing punch
250: fourth drawing punch
260: First Daibush
270: Second Daibush
280: Third Daibush
290: 4th Daibush
291: inclined portion
300: Piercing Mold
310, 320, 330, 340: upper punch
350, 360, 370, 380: Piercing Punch
390: heating plate
391: fixing bush
392, 393: Piercing Hole
400: Trimming Mold
410: upper mold
420: lower mold
500: steel plate
U: upper case
H: home
S: notching area
R1: slope of the first die bush
R2: first curvature
R3: second curvature

Claims (6)

A notching mold for removing a portion of the steel sheet;
A drawing mold which sequentially presses one surface of the steel sheet passing through the notching mold to form a cylinder;
A piercing mold for drilling at least one hole in the bottom of the cylinder; And
A trimming mold for separating the cylinder punched by the piercing mold from the steel sheet; / RTI &gt;
The drawing mold is
A plurality of drawing punches for pressing the outer circumferential surface of the steel sheet in one direction;
A drawing die for supporting the steel sheet under the steel sheet; And
A plurality of die bushes having a hollow cylindrical shape for inserting the steel sheet pressurized by the drawing punch and being coupled to the inside of the drawing die; Including,
The inner circumferential surface of the at least one die bush is formed to be tapered so that the inner diameter extends from one end into which the steel sheet is inserted toward the other end,
Tapered inclination of the inner peripheral surface of the die bush is formed from 1 ° to 3 °,
One end of the die bush has a slope inclined downward in the insertion direction of the steel sheet,
The inclined surface
An inclined portion inclined at a predetermined angle from the central axis of the die bush;
A first curvature portion extending from one end of the inclined portion to be in contact with the steel sheet before being pressed by the drawing punch and formed round; And
A second curvature portion formed at the other end of the inclined portion and having a curvature of 2 to 6 times larger than the curvature of the first curvature portion; &Lt; RTI ID = 0.0 &gt;
The manufacturing apparatus of the upper case for automobile ABS units. delete delete delete The method of claim 1,
The drawing mold is
A projection forming punch in which one or more projections are formed to press one surface of the steel sheet to form at least one groove; &Lt; RTI ID = 0.0 &gt;
The manufacturing apparatus of the upper case for automobile ABS units. The method of claim 5,
The piercing mold
A fixing bush provided to draw in a cylinder formed from the drawing mold;
A piercing punch for forming a piercing hole in a bottom of a cylinder introduced into the fixing bush; And
A heating plate connected to one side of the fixing bush and supplying heat to the fixing bush so that the temperature of the surface of the cylinder increases; &Lt; RTI ID = 0.0 &gt;
The manufacturing apparatus of the upper case for automobile ABS units.

Images