KR20020043532A - manufacture method and apparatus press mold of the connecting rim of the flexible connectors for an automobile - Google Patents

Abstract

PURPOSE: A method for manufacturing a connecting rim and a press die apparatus are provided to reduce manufacturing and management cost of die and equipment by forming a pipe to be the connecting rim using two steps of a curling and a burring. CONSTITUTION: A raw material is provided to form a flexible connector rim(30) which is made from a metal pipe with proper length and diameter. The metal pipe is drawn to be enlarged at its peripheral lower end by a curling by which a first drawing punch having a trumpet punch groove is drawn to a curling die where the metal pipe is set. The curled forming pipe is drawn to be shaped as projecting sill by a burring by which a second drawing punch having a punch groove is drawn to a burring die where the curled forming metal pipe is set. Between the curling and the burring is carried out a pre-drawing of projecting sill for rounding a upper portion of the curled forming pipe at certain angle.

Description

{Manufacture method and apparatus press mold of the connecting rim of the flexible connectors for an automobile}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a connecting rim assembled at both ends of a flexible connector installed in an exhaust line of a vehicle by a press drawing method using a pipe as a material, and to a press mold apparatus thereof. It is about.

In general, the exhaust line of an automobile absorbs the vibration and displacement of the entire exhaust line due to engine roll vibrations during engine start-up, rapid braking, gear shifting, or road vibrations where the exhaust pipe vibrates according to road conditions during driving. In addition, an exhaust line shock absorber is provided, which absorbs or cushions damage or loosening of the connecting portion, the welded portion, or the like in the engine, the vehicle body, and the exhaust line, thereby improving durability and ride comfort of the exhaust line.

The exhaust line shock absorber is provided in various types according to the exhaust line characteristics of the vehicle, one of which is a flexible connector 20 having a woven mesh as shown in Figs. have.

As shown in FIG. 1, the flexible connector 20 has a front exhaust pipe 27 for exhausting exhaust gas from an engine and an exhaust line to which the converter 28 and the muffler 29 are connected. ) Is installed in the middle of the front exhaust pipe 27.

Detailed configuration of the flexible connector 20 as shown in Figures 2 to 5, the bellows tube 21 having an internal connection tube 22 at both side ends therein is built, the outside of the bellows tube 21 The finishing material is formed of a stainless steel woven mesh 23, the left and right ends of the woven mesh 23 is covered on the outer surface of the inner connection pipe 22 of the bellows pipe 21 to connect with the front exhaust pipe 27 It is configured to be fixed by the left and right connection rims 30 for.

The detailed configuration of the left and right connecting rims 30 is made of stainless steel, as shown in Figures 4 to 5, the front end is formed with a stepped portion 31 is bent inwards a certain width, the middle portion It is formed of a connection tube 32 of a predetermined length, the rear end is formed of a closing tube 33 opened in a trumpet tube shape while extending integrally to the rear end of the connection tube 32.

Known as a manufacturing method of the left and right connecting rims 30 of such a configuration has been produced by the press drawing method by using a strip-shaped steel sheet wound in the form of a roll and a progressive press mold provided with five dies and punches.

Looking at the conventional manufacturing method in detail, if the strip-shaped steel sheet wound in the roll (roll) is continuously and stepwise supplied to the primary die side of the progressive press mold having five dies and punches installed in the press machine shown in Figs. As you did,

A notching process of cutting the corners of the outer circumference with the scrap 40f while leaving the disc 40a in a partial square area of the strip-shaped steel sheet 40 by a predetermined punch at the primary drawing position D1 where the primary die is installed; ,

Press the center part with a predetermined punch against the disc 40a transferred to the secondary drawing position D2 where the secondary die is installed, the upper end to the closing tube member 40b, the middle part to the connecting tube 32, and the lower part to A drawing step of forming a cup member formed of the bottom plate 40c,

With respect to the cup member transferred to the tertiary drawing position D3 provided with the tertiary die, the center portion of the bottom plate 40c is cut out with disc scraps 40g with a predetermined punch, and a stepped wheel 40d is formed around the cup member. A piercing process for drawing,

In the fourth drawing position D4 provided with the fourth die, a burring process of bending the inner circumferential end of the step wheel 40d downward by a predetermined punch to be formed into the step jaw 31, and

In the fifth drawing position (D5) where the fifth die is installed, the disc is the same as the outer circumference of the closing tube 33 while leaving a ring-shaped scrap 40h inside the outer circumference of the closing tube member 40b by a predetermined punch. The trimming process is performed by a trimming process of manufacturing the connection rim 30 which is a predetermined finished product.

According to the conventional manufacturing method of the connection rim 30 as described above, by using the belt-shaped steel sheet 40 wound in the form of a roll, and produced by the press drawing method by a progressive press mold in which five dies and punches are integrally installed, The process was automated and there was mass productivity.

However, the corner scrap 40f at the time of stripping the strip-shaped steel sheet 40 to the disk 40a by the notching process, the disk scrap 40g to be cut at the center of the cup member bottom plate 40c in the piercing process, and the finishing tube The ring-shaped scraps 40h, which are removed from the member 40b to the finishing tube 33, are material loss, and the scrap amount is about the same weight as the material of the connecting rim 30, which is a finished product, and one finished connection rim ( 30) takes twice the weight of the steel required to manufacture the material costs a lot of disadvantages,

In addition, the entire manufacturing process requires at least five drawing processes, such that the die and the punch of the progressive press die are lengthened in the transverse direction and are bulky, and the capacity of the press has to use a high capacity.

The above problems are disadvantageous in that the mold cost is high, the handling is difficult, the operating cost of the manufacturing equipment is high, and in particular, the material cost is high and the manufacturing cost is also high.

The present invention solves the shortcomings of the flexible connector connection rim manufacturing method for automobiles, which uses a strip-shaped steel sheet wound in the form of a conventional roll as described above and has several drawing processes as a main process by using a progressive press mold provided with several dies and punches. In order to provide a flexible connector, the connecting rim of the flexible connector is manufactured by a drawing method by pressing the pipe as a raw material, and there is almost no material loss, low material cost, high production speed, and good mass productivity. It is an object of the present invention to provide a flexible connector connection rim manufacturing method for automobiles and a press mold apparatus thereof, which are inexpensive and can significantly lower the manufacturing cost.

1 is an example of an installation state of a flexible connector for automobiles

Figure 2 is a perspective view of an example flexible connector for a vehicle to which the present invention is applied

3 is a cross-sectional view of an example flexible connector for an automobile to which the present invention is applied;

4 is a perspective view of a connecting rim of an example flexible connector for a vehicle to which the present invention is applied;

5 is a cross-sectional view of a connecting rim of an example flexible connector for an automobile to which the present invention is applied;

Figure 6 is a perspective view of a press-drawn molding of an example flexible connector connection rim for an automobile according to a conventional manufacturing method

7 is a plan view of a press-drawn molding of an example flexible connector connection rim for an automobile according to a conventional manufacturing method

8 is a cross-sectional view of a press-molded article of an example flexible connector connection rim for an automobile according to a conventional manufacturing method

Figure 9 is a cross-sectional view of the configuration of the primary press mold apparatus for manufacturing a flexible connector connection rim for an embodiment of the present invention

10 is a cross-sectional view of a main configuration of a punch set of a primary press die apparatus for manufacturing flexible connector connection rims for automobiles according to one embodiment of the present invention;

Figure 11 is a cross-sectional view of the main configuration of the die set of the primary press mold apparatus for manufacturing a flexible connector connection rim for an embodiment of the present invention

12 is a cross-sectional view of a secondary press mold apparatus for manufacturing a flexible connector connection rim for an embodiment of the present invention;

Fig. 13 is a sectional view of the main configuration of a punch set of a secondary press mold apparatus for manufacturing flexible connector connection rims for automobiles according to one embodiment of the present invention;

Fig. 14 is a sectional view of the main configuration of a die set of a secondary press mold apparatus for manufacturing flexible connector connection rims for automobiles according to one embodiment of the present invention.

Figure 15a to 15g is an embodiment of the curling process of the manufacturing method of an embodiment by a primary press mold apparatus for manufacturing flexible connector connection rim for automobiles of the present invention

Figures 16a to 16g is a burling process progress of an embodiment manufacturing method by a second press mold apparatus for manufacturing a flexible connector connection rim for an embodiment of the present invention

(Short description of symbols for the main parts of the drawing)

D1: 1st drawing position D2: 2nd drawing position D3: 3rd drawing position

D4: 4th drawing position D5: 5th drawing position

20: Flexible connector 21: Bellows tube 22: Internal connector

23: woven mesh 27: front exhaust pipe 28: converter

30: Flexible rim connection rim 31: Flexible connector rim connection

32: Connector of flexible connector connection rim

33: Closed end of flexible connector connection rim

40: strip-shaped steel plate 40a: disc 40b: finish pipe member

40c: bottom plate 40d: jaw ring 40f: edge scrap

40 g: Disc scrap 40 h: Ring scrap

100: raw material pipe 100a: semi-finished molded pipe

50,50a: 1,2nd die equipment 51,51a: 1,2nd die plate

52,52a: 1, 2nd die 521: 1st top die 521a, 523a: 2nd top and bottom die

522: 1st round molding step 522a: 2nd round molding step

523: cylindrical primary lower die 524: step die 525: control rod

53,53a: 1, 2nd die stripper 531,531a: 1, 2nd inner circumference

535: spring 536: guide bar 537: guide bushing

54,54a: 1, 2nd punch plate 541,541a: spring

55,56,55a, 56a: 1, 2nd internal and external punch 551: Pressed groove

552,552a: control jaw 561,561a: guide step

562,562a: Cylindrical rim 563,563a: Guide rim

564a: secondary curved step 565: cylindrical stepped molded rim

57,57a: 1, 2nd punch stripper 571: spring

The flexible connector connection rim manufacturing method for automobiles of the present invention for achieving the above object is a drawing method by a press mold apparatus which performs at least two steps of drawing process using a flexible connector connection rim of a predetermined standard as a raw material of a pipe. As characterized by manufacturing,

A raw material pipe prepared by cutting a metal pipe having a predetermined diameter into an appropriate length required for forming a flexible connector connecting rim having a predetermined size, and a press die device for drawing and forming the raw material pipe into a connecting rim having a predetermined shape. In that,

A curling die set with a cut standard pipe of a predetermined size is drawn with a primary drawing punch having a flap-shaped punch groove drawing in the form of a predetermined connection rim closure tube to be molded, and the raw pipe set with the curling die A finishing tube curling process of extending a lower end portion around the bottom portion in a fallopian tube shape;

Punch for setting the semi-finished molded pipe, the lower end of which is formed in the form of a fallopian tube by the finishing tube curling process, on the bearing die, and drawing the upper end of the set semi-finished molded pipe in the form of a stepped shape in the form of a predetermined connection rim tip to be molded. Drawing by a secondary drawing punch having a groove, it is characterized in that it is carried out in two stages of a step burring process of bending and standing the upper end portion of the semi-finished pipe inwards.

The present invention constituted by the two-stage drawing process of the closed tube curling process and the stepped burring process is not necessarily performed in sequence, and is formed in various aspects depending on the configuration of the press mold apparatus to be used. can do.

For example, when a compound mold apparatus is used, curling and burring processes can be simultaneously performed by a single press mold apparatus in a single press machine, or can be performed in an annual stroke.

In addition, when the two-step drawing process of the finishing tube curling process and the stepped burring process is performed by two different press machines and two mold apparatuses, each process sequence is first bent inward to the upper end of the raw material pipe. After performing the stepped burring step of forming the stepped step, the same effect can be obtained by performing a closed tube curling step of extending the periphery of the lower end of the raw material pipe outward in a predetermined width in the form of a fallopian tube in the secondary step.

Hereinafter, the configuration of the flexible connector connection rim manufacturing method and the press mold apparatus for automobiles according to the present invention will be described in detail with reference to the accompanying drawings.

9 to 14 show a connection rim 30 of an example of a flexible connector for automobiles as shown in FIGS. First and second mold apparatuses 50 and 50a of a preferred embodiment of molding are shown.

The primary and secondary mold apparatuses 50 and 50a are respectively primary and secondary die plates 51 and 51a, dies 52 and 52a, die strippers 53 and 53a, and 1,2. The secondary punch plates 54, 54a, inner and outer punches 55, 56, 55a, 56a, and punch strippers 57, 57a.

The primary and secondary dies 52 and 52a are assembled and fixed to the primary and secondary pre-beds (bolsters) by the primary and secondary die plates 51 and 51a respectively formed of several plate pieces. In addition, the first and second die strippers 53 and 53a are respectively provided on the outside of each of the first and second dies 52 and 52a.

The form of the primary die 52 is a configuration for drawing molding the connecting pipe 32 and the closing pipe 33 in the configuration of the connecting rim 30 with respect to the raw material pipe 100,

A cylindrical upper upper die 521 having a diameter equal to the inner diameter of the connecting tube 32 of the connecting rim 30 to be molded and a height slightly lower than that of the connecting tube 32, and the primary upper die 521. It is formed integrally with a diameter slightly smaller than the outer circumferential diameter of the closing tube 33 while being connected to the first round-shaped forming step 522 having the same shape as the inner peripheral surface curved surface of the closing tube 33 to be molded from the bottom of It is formed of a cylindrical primary lower die 523 (see Figs. 9 and 11).

The primary inner and outer punches 55 and 56 are prefabricated by primary punch plates 54 composed of several plate pieces with respect to the slide of the primary press.

The primary inner punch 55 is a cylinder of the same diameter as the outer diameter of the connecting tube 32 of the connecting rim 30 to be molded, being installed concentrically from the center of the cylindrical primary outer punch 56 The primary punch plate 54 is installed with a certain elasticity with a spring 541, the lower end portion is formed with a pressing groove wheel 551 for pressing the upper surface of the raw material pipe 100 to the outer periphery, the control on the upper outer periphery It is the structure provided with the jaw 552 (refer FIG. 9, FIG. 10).

The first outer punch 56 is formed with a guide step 561 in the form of an outer circumferential surface of the closing tube 33 of the connecting rim 30 to be molded into an inner side of a lower end thereof, and then upwards after the guide step 561. It is formed of a cylindrical rim 562 having the same diameter and a predetermined length as the outer circumferential surface of the connecting tube 32 in a configuration for forming the connecting tube 32 of the connecting rim 30 to be molded, the cylindrical rim 562 In the upper end of the) is a guide rim 563 is formed to accommodate the control jaw 551 of the primary inner punch 55 to guide in the vertical direction (see Figs. 9 and 10).

The shape of the secondary die 52a is a connection tube of the primary die 52 and the primary inner and outer punches 55 and 56 with respect to the raw material pipe 100 with respect to the raw material pipe 100. As a structure for drawing-molding the step 31 from the structure of the connection rim 30 with respect to the member which carried out drawing-molding of the 32 and the closed tube 33,

Secondary upper and lower dies 521a and 523a having the same configuration as that of the primary upper and lower dies 521 and 523 and the primary round molding step 522 and the secondary round molding step ( While having a 522a, an additional upper end portion of the secondary upper die 521a is provided with a stepped die 524 of a cylindrical shape having the same size as that of the inner circumferential surface of the stepped portion 31 of the connecting rim 30 to be molded.

In addition, a control rod 525 is installed at the center of the upper end surface of the stepped die 524 to control the downward stroke of the secondary internal punch 55a to a predetermined height (see FIGS. 12 and 14).

The secondary inner and outer punches 55a and 56a are assembled by a secondary punch plate 54a composed of several plate pieces with respect to the slide of the secondary press.

The secondary inner punch 55a is a cylinder having a diameter smaller than the inner diameter of the connecting pipe 32 of the connecting rim 30 to be molded and larger than the outer diameter of the step 31, and the cylindrical secondary outer punch 56a. While being installed concentrically from the center of the secondary punch plate 54a is installed with a certain elasticity with a spring 541a, the upper outer periphery is configured with a control jaw 552a (see Fig. 12, Fig. 13) .

The secondary outer punch 56a has a guide step 561a having the same shape as that of the outer circumferential surface of the closing tube 33 of the connecting rim 30 to be molded to the inner side of the lower end, and protrudes higher than the lower surface 566. A cylindrical rim 562a having the same height as the outer diameter of the connecting pipe 32 of the connecting rim 30 to be molded is formed above the guide step 561a, and the cylindrical rim 562a. At the top of the secondary curved stepped jaw 564 having the same shape as the outer surface of the curved portion bent to the step 31 in the configuration of the connecting rim 30 to be formed is formed, and then from the top of the second curved stepped jaw 564 A cylindrical stepped rim 565 having the same diameter as the outer diameter of the stepped 31 is formed at a predetermined height, and the control jaw 551a of the secondary inner punch 55a is accommodated at the upper end of the stepped rim 565. The guide rim 563a which guides in the up and down direction is formed (see Figs. 12 and 13).

The primary and secondary die strippers 53 and 53a have the same configuration, and have a ring shape fitted to the outer circumferential surface of the primary and secondary lower dies 523 and 523a of the primary and secondary dies 52 and 52a. In addition, the first and second die plates 51 and 51a are fixed up and down by several springs 535 and guide bars 536 and guide bushings 537 fitted to the outer circumferential surfaces of the guide bars 536. It is installed in an elastic state with a stroke.

First and second inner circumferential surfaces 531 and 531a having a step of a size larger than the thickness of the closing tube 33 of the connecting rim 30 to be molded at the inner end surfaces of the first and second die strippers 53 and 53a. Are each formed.

The outer diameters of the first and second inner circumferential surfaces 531 and 531a are formed to be the same as the outer circumferential diameter of the finishing tube 33 of the connecting rim 30 to be molded, and at the maximum rising position, Is located above the top surface of the stepped die 524 formed on the top surface or the top of the secondary upper die 521a,

When pressed by the first and second punch strippers 57 and 57a, the height of the inner circumferential surfaces 531 and 531a is lowered when the lower surface is supported by the upper and lower surfaces of the first and second die plates 51 and 51a. The round shaped stepped portions 522 and 522a are formed in the same line as the outer periphery.

The first and second punch strippers 57 and 57a are ring-shaped to be fitted to the outer surfaces of the first and second outer punches 56 and 56a, and the first and second punch strips 54 and 54a. A plurality of springs 571, guide bars (not shown) and guide bushings (not shown) are installed in an elastic state with a predetermined stroke up and down, and the bottom surface thereof is the first and second outer punches 56. It is set to a predetermined width lower than the position of the bottom surface of the 56a, the configuration for pressing the first and second die strippers 53, 53a before the first and second outer punches 56, 56a in operation. (See Figs. 9-14).

The compressive force of the spring 571 supporting the primary and secondary punch strippers 57 and 57a is set stronger than the springs 535 of the primary and secondary die strippers 53 and 53a.

In the configuration of the first and second mold apparatuses 50 and 50a, the first and second punches and punch strippers and punch plates are operated up and down with respect to the die set consisting of the first and second dies, the die stripper and the die plate. The configuration of the lifting guide stripper, which is the up and down lifting guide member of the configured punch set, is omitted, and the configuration of the bolt fixing and assembling the die, plate, and strippers in each of the die set and the punch set is also omitted.

As described above, the method for manufacturing flexible connector connection rims for automobiles according to one embodiment of the present invention as described above includes the configuration of the first and second press mold apparatuses 50 and 50a.

In one embodiment, the method for manufacturing a flexible connector connection rim for an automobile by using the first and second press mold apparatuses cuts a stainless pipe to a predetermined diameter and an appropriate length required for forming the flexible connector 20 of an example to be molded. One raw material pipe 100 is used as a molding material, and the first and second press mold apparatuses 50 and 50a are each subjected to a primary finishing tube curling process and a secondary step burring process.

The primary finishing tube curling process by the primary press die apparatus 50 is carried out after the cut raw material pipe 100 is mounted on the primary upper die 521 of the primary die 52 as shown in Fig. 15A. do.

When the primary inner and outer punches 55 and 56 and the primary punch stripper 57 are lowered with respect to the primary die 52 in which the raw material pipe 100 is vertically inserted, as shown in FIG. 15B, the primary punch stripper ( 57 is first connected to the top surface of the primary die stripper 53, and then the pressing groove 551 formed at the outer periphery of the bottom surface of the primary inner punch 55 is connected to the top surface of the raw material pipe 100. .

The primary inner and outer punches 55 and 56 and the primary punch stripper 57 are continued while the pressing groove 551 of the primary inner punch 55 is connected to the upper surface of the raw material pipe 100. Is further lowered, the primary punch stripper 57 is lowered by pressing the top surface of the primary die stripper 53 as shown in Fig. 15C, and the primary outer punch 56 is lowered along the outer surface of the raw material pipe 100. The primary inner punch 55 is a spring 541 is pressed until the upper surface is in contact with the lower surface of the primary punch plate 54, the pressing groove wheel 551 is connected to the upper surface of the raw material pipe 100 Maintain state.

The first inner and outer punches 55 and 56 and the first punch strippers 57 are further formed while the top surface of the first inner punch 55 is in contact with the bottom surface of the first punch plate 54. When lowered, as shown in Fig. 15D, with the primary punch stripper 57 not completely lowering the primary die stripper 53, and also with the primary outer punch 56 not fully lowered, the primary inner punch 55 is a primary round type having the same shape as the inner peripheral surface curved surface of the finishing pipe 33 to form the lower end of the raw material pipe 100 is pressed by the pressing groove 551 to the raw material pipe 100 The curling process is gradually opened to the outside by the forming step 522.

Subsequently, when the first inner and outer punches 55 and 56 and the first punch stripper 57 are further lowered to reach the bottom dead center, the first punch stripper 57 is the first die stripper 53 as shown in FIG. 15E. ) Is completely lowered so that the inner circumferential surface 531 of the upper end surface of the primary die stripper 53 coincides with the outer circumference of the primary round molding step 522, and the primary outer punch 56 is also lowered completely. The inner guide step 561 is positioned with a predetermined space above the inner peripheral surface 531 of the upper end surface of the primary die stripper 53 and the primary round molding step 522, and the primary internal punch 55. The pressing groove wheel 551 is to continue to press the upper surface of the raw material pipe 100, the first round-shaped forming step having the same shape as the inner peripheral surface curved surface of the finishing tube 33 to form the lower end of the raw material pipe 100 From 522 to the closing tube (33) fully open until it reaches the outer peripheral step of the inner peripheral surface (531) of the primary die stripper (53) Type a curling process is completed for.

When the press slide is raised after the curling drawing process is completed, the first outer punch 56 and the first punch stripper 57 are raised, and the first inner punch 55 is kept intact by the compression force of the spring 541. When the jaw 552 is caught by the lower end of the upper guide rim 563 of the primary outer punch 56, the jaw 552 is raised together, and the lower portion of the jaw 550 is first molded into the semi-finished molded pipe 100a formed by the tubular closure tube 33. It separates from the cylindrical rim 562 of the outer punch 56 (refer FIG. 15F).

At the same time, as the first outer punch 56 and the first punch stripper 57 are raised, the first die stripper 53 also rises with elasticity of the spring 535, and the inner peripheral surface 531 of the first die stripper 53 is raised. The semi-finished molded pipe 100a having a part of the outer periphery of the lower end formed by the closing tube 33 is separated from the primary upper die 521 and raised above the upper end surface, thereby allowing the 1 Complete the primary tube curling process (see Figure 15g).

In the secondary stepped burring process by the secondary press die apparatus 50a, the semi-finished forming pipe 100a formed by the primary curling process with a lower end portion formed into the finishing tube 33 as shown in FIG. 16A. The lower end curled by 33) is mounted on the inner circumferential surface 531a of the secondary die stripper 53a.

The secondary inner and outer punches 55a and 56a and the secondary punch stripper with respect to the secondary die 52a on which the semi-finished molded pipe 100a is mounted on the inner circumferential surface 531a of the secondary die stripper 53a. When 57a) is lowered, the secondary punch stripper 57a is first connected to the upper surface of the secondary die stripper 53a as shown in Fig. 16B, and the upper end of the semi-finished molded pipe 100a is formed of the secondary internal punch 55a. It fits between the outer surface and the inner lower cylindrical rim 562a of the secondary outer punch 56a.

If the secondary inner and outer punches 55a and 56a and the secondary punch stripper 57a are further lowered, the secondary punch stripper 57a is the upper surface of the secondary die stripper 53a as shown in Fig. 16C. Press and continue to lower, the secondary inner punch (55a) is stopped by the bottom surface is restrained by the control rod 525 protruding to a certain height in the center of the top surface of the step die 524.

If the secondary outer punch 56a continues to press the upper end of the semifinished molded pipe 100a by the secondary curved step 564 of the inner middle, the secondary inner punch 55a is stopped, and the semi-finished molded pipe The upper end of the (100a) comes down the side of the stationary secondary inner punch (55a) is off the bottom,

As shown in Fig. 16D, at the forming position with the stepped die 524 of a cylindrical shape having the same dimensions as the curved surface and the height of the inner circumferential surface of the stepped portion 31 of the connecting rim 30 to be formed formed on a part of the upper end of the secondary upper die 521a. As the secondary curved step 564 of the inner middle reaches,

As shown in Fig. 16E, a burring process is performed in which the upper end portion of the semi-finished molded pipe 100a is bent inward with the step forming rim 565 to the bottom dead center of the slide to form the step 31.

The secondary punch stripper 57a during the molding process of the secondary curved punch 564 and the stepped forming rim 565 of the secondary outer punch 56a and the step 31 by the secondary upper die 521a. ) Presses the secondary die stripper 53a completely on the upper surface of the secondary die plate 51a so that the inner circumferential surface 531a of the upper surface of the secondary die stripper 53a is outside the secondary round molding step 522a. The secondary guide step 561a, which is part of the lower end surface of the secondary outer punch 56a, is also matched with the circumference, and the second round-shaped stepped step 522a is also curled by the closing tube 33 of the semi-finished molded pipe 100a. Will be pressed from above.

When the press slide is raised after the completion of molding to the finished product connecting rim 30 by the burring process of forming the step 31 as described above, as shown in Fig. 16F, the first secondary punch (56a) and the second punch stripper (57a) ) And the secondary inner punch 55a is stepped as the upper end of the molded finished connecting rim 30 which is raised by the secondary punch stripper 57a which is raised while being kept intact for a predetermined stroke by the compression force of the spring 541. When 31 is connected to the lower end surface, the lift is controlled during a predetermined stroke, so that the finished product connection rim is formed from the cylindrical rim 562a of the secondary outer punch 56a, the secondary curved stepped jaw 564, and the stepped molded rim 565. 30) is separated, and when the control step 552a is caught on the lower end of the upper guide rim 563a of the secondary outer punch 56a which is continuously raised, it rises together.

As described above, when the secondary outer punch 56a and the secondary punch stripper 57a are fully raised, the secondary die stripper 53a also rises with the elasticity of the spring 535a, and thus the secondary die stripper 53a The finished product connecting rim 30 having a part of the outer periphery of the lower end formed by the closing tube 33 on the inner circumferential surface 531a is separated from the secondary upper die 521a, and raised above the upper surface to form the secondary mold apparatus 50a. To complete the secondary step of burring process (see FIG. 16G).

According to one embodiment of the first and second press mold apparatus 50, 50a of the present invention as described above and the second step primary finishing tube curling process and the secondary step burring process of one embodiment, the raw material pipe 100 As the molding material, the connecting rim 30 having the step 31, the connecting pipe 32, and the closing pipe 33 for the flexible connector 20 can be molded.

In implementing the present invention as described above, the first and second press mold apparatuses 50 and 50a and the manufacturing method thereof according to the above embodiments are presented as preferred embodiments of the present invention, but are not limited thereto. In terms of drawing processing efficiency and quality control, the press mold apparatus and manufacturing method may be partially changed.

For example, the secondary mold apparatus 50a of the above-described embodiment is a compound mold apparatus having a configuration of a curling die and a punch of the finishing tube 33 and a bearing die and a punch of the step 31.

Depending on the capacity setting of the press, the closing tube 33 and the step 31 of the connecting rim 30 may be simultaneously formed in one slide stroke in one press.

In addition, the first and second press mold apparatuses 50 and 50a of one embodiment may achieve the same effect even if the configuration of the punch and the die is changed up and down.

In addition, in the manufacturing method of an embodiment of the present invention described above, in order to increase the efficiency of the secondary stepped burring process, the primary finish tube curling is preliminarily performed between the primary closed tube curling process and the secondary stepped burring process. It may be carried out by adding a preliminary stepped drawing step of bending the upper end portion of the semi-finished molded pipe 100a inwardly at an angle.

According to the press mold apparatus and the manufacturing method of the present invention as described above, a step 31, a connecting pipe 32, and a closing tube 33 for the flexible connector 20 are formed using a pipe having a predetermined size as a molding material. The connection rim 30 which can have was formed,

By a progressive press mold apparatus using a strip-shaped steel sheet wound in the form of a conventional roll and provided with five dies and punches, the manufacturing method is performed in a five-step process of a notching process, a drawing process, a piercing process, a burring process, and a trimming process. In comparison, there is almost no material scrap, and the material cost per fabrication of one finished joint rim can be significantly reduced.

In addition, the overall manufacturing process can reduce the minimum three steps from the conventional five steps to form two steps can significantly increase the productivity.

In addition, in the mold apparatus, the structure of die and punch is simpler, the volume is greatly reduced, and the capacity of the press is also lower than that of the five-step progressive press mold, so the mold cost is low, the handling is easy, and the production equipment The operating cost is lowered, and the overall manufacturing cost of the flexible rim for the flexible connector can be significantly lowered.

As the raw material pipe, the metal pipe of the proper length and diameter required for forming the flexible connector connection rim of a predetermined standard,

One end of the raw material pipe is curled in the form of a predetermined connecting rim closing tube to be molded by a compound press mold apparatus having a punch and a die having a predetermined configuration for forming a closing tube and a step of a predetermined connecting rim to be molded. And the other end is a method of manufacturing a flexible rim of the automotive flexible connector, characterized in that simultaneously carrying out a two-stage molding process in the form of a predetermined connection rim step to be molded in one press machine.

Claims (7)

As the raw material pipe, the metal pipe of the proper length and diameter required for forming the flexible connector connection rim of a predetermined standard, A curling die set with raw material pipes is drawn with a primary drawing punch having a flap punch groove for drawing in the form of a predetermined connection rim closure tube to be molded, and a round tube shape is formed around the lower end of the raw material pipe set on the curling die. A curling tube curling process that extends outside the predetermined width of the furnace; Punch for setting the semi-finished molded pipe, the lower end of which is formed in the form of a fallopian tube by the finishing tube curling process, on the bearing die, and drawing the upper end of the set semi-finished molded pipe in the form of a stepped shape in the form of a predetermined connection rim tip to be molded. Manufacture of a flexible rim connector for automobiles, characterized in that the drawing is carried out by a secondary drawing punch having a groove, and is carried out by a two-stage press drawing method of a step burring process in which the upper end portion of the semi-finished pipe is bent and erected inward. Way. The method according to claim 1, further comprising a preliminary stepped drawing process for bending an upper end portion of the semi-finished forming pipe formed at the lower end portion in the form of a fallopian tube by the closing tube curling process, in between the closed tube curling process and the stepped burring process. Method of manufacturing a connection rim of a flexible connector for automobiles, characterized in that the configuration. As the raw material pipe, the metal pipe of the proper length and diameter required for forming the flexible connector connection rim of a predetermined standard, One end of the raw material pipe is curled in the form of a predetermined connection rim closure tube to be formed by a compound press mold apparatus having a punch and a die having a predetermined configuration for forming a closing tube and a step of a predetermined connection rim to be molded. And the other end is a method of manufacturing a flexible rim of the automotive flexible connector, characterized in that simultaneously carrying out a two-stage molding process in the form of a predetermined connection rim step to be molded in one press machine. In one step of the manufacturing method of the connection rim of the flexible connector for automobile, one end of the raw material pipe is finished with the metal pipe of the appropriate length and diameter required for forming the flexible connector connection rim of a predetermined standard. In the configuration of the die set of the press mold apparatus used for the finishing tube curling process that extends outward a certain width in the form of a tube, A cylindrical upper upper die 521 having a diameter equal to the inner diameter of the connecting tube 32 of the connecting rim 30 to be molded and a height slightly lower than that of the connecting tube 32, and the primary upper die 521. The cylinder is formed integrally with a diameter slightly smaller than the outer circumferential diameter of the closing tube 33 while being connected to the first round-shaped forming step 522 of the same shape as the inner peripheral surface curved surface of the closing tube 33 to be molded from the bottom of A primary die 52 composed of a mold primary lower die 523, It becomes ring-shaped to be fitted to the outer circumferential surface of the primary lower die 523 of the primary die 52, is installed in the primary die plate 51 in a resilient state having a predetermined stroke up and down, the outer diameter at the inner end of the upper end surface It has the same step diameter as the outer circumferential diameter of the closing tube 33 of the connecting rim 30 to be molded and is larger than the thickness of the closing tube 33 of the connecting rim 30 to be molded. Press die apparatus for manufacturing a connection rim of a flexible connector for automobiles, characterized in that it comprises a primary die stripper (53) formed with a primary inner circumferential surface (531) of a standard located on the same line as the outer periphery of the step (522). Die set. In one step of the manufacturing method of the connection rim of the flexible connector for automobile, one end of the raw material pipe is connected to the connection rim step by using the metal pipe of appropriate length and diameter required for forming the flexible connector connection rim of a predetermined standard as the raw material pipe. In the configuration of the die set of the press mold apparatus used for the stepped burring process of bending and standing inward in a constant width in the form, A cylindrical upper secondary die 521a having a diameter equal to the inner diameter of the connecting tube 32 of the connecting rim 30 to be molded and a height slightly lower than that of the connecting tube 32, and the secondary upper die 521a. Cylinder which is formed integrally with a diameter slightly smaller than the outer circumferential diameter of the closing tube 33 while being connected to the first round-shaped forming step 522a having the same shape as the inner peripheral surface curved surface of the closing tube 33 to be molded from the bottom of On the upper part of the upper secondary die 523a and the secondary upper die 521a, a cylindrical stepped die 524 having the same size as that of the inner circumferential surface of the stepped portion 31 of the connecting rim 30 to be molded is formed. A secondary die 52a provided at the center of the upper end surface of the stepped die 524 and having a control rod 525 for controlling the downward stroke of the secondary internal punch 55a to a predetermined height; It becomes ring-shaped fitted to the outer peripheral surface of the secondary lower die 523a of the secondary die 52a, and is installed on the secondary die plate 51a in a resilient state having a predetermined stroke up and down, and an outer diameter at the inner end of the upper end surface. It has the same step diameter as the outer circumferential diameter of the closing tube 33 of the connecting rim 30 to be molded and is larger than the thickness of the closing tube 33 of the connecting rim 30 to be molded. A press die device for manufacturing a connection rim of a flexible connector for automobiles, comprising a secondary die stripper 53a having a secondary inner circumferential surface 531a of a standard positioned on the same line as the outer circumference of the step 522a. Die set. As a step of manufacturing a flexible rim of a flexible connector for automobiles, the raw material pipe is made of a metal pipe of an appropriate length and diameter required for forming a flexible connector rim of a predetermined standard. In the configuration of the punch set of the press mold apparatus used in the finishing tube curling process of extending one side end of the raw material pipe to a certain width outside in the form of a connecting rim closure tube, It is a cylinder of the same diameter as the outer diameter of the connecting pipe 32 of the connecting rim 30 to be molded, is installed on the primary punch plate 54 with a constant elasticity with a spring 541, the raw material pipe on the lower end with an outer circumference Pressing groove wheel 551 is formed to press the upper surface of the upper outer periphery of the first inner punch 55 having a control jaw 552, and A guide step 561 in the form of an outer circumferential surface of the closing tube 33 of the connecting rim 30 to be molded is formed to protrude a predetermined height higher than the bottom surface 566, and then the guide step 561 is formed. The first inner punch is formed of a cylindrical rim 562 having the same diameter and a predetermined length as the outer circumferential surface of the connecting tube 32 in a configuration of forming the connecting tube 32 of the connecting rim 30 to be molded upward. The first outer punch (55), the upper end of the cylindrical rim 562 is formed with a guide rim (563) for receiving the control jaw 551 of the primary inner punch (55) and guides in the vertical direction ( 56), It is ring-shaped to be fitted to the outer surface of the primary outer punch 56, has a predetermined stroke up and down on the primary punch plate 54 and is installed in a resilient state stronger than the resilience of the primary die strippers 53, Press mold apparatus for manufacturing a connection rim of a flexible connector for a vehicle, characterized in that the lower surface is composed of a primary punch stripper 57 is set to a predetermined width lower than the position of the lower surface of the primary outer punch (56). Of punches. In one step of the manufacturing method of the connection rim of the flexible connector for automobile, one end of the raw material pipe is connected to the connection rim step by using the metal pipe of appropriate length and diameter required for forming the flexible connector connection rim of a predetermined standard as the raw material pipe. In the configuration of the punch set of the press mold apparatus used in the stepped burring process of bending and standing inward in a constant width in the form, It is a cylinder having a diameter smaller than the inner diameter of the connecting tube 32 of the connecting rim 30 to be molded and larger than the outer diameter of the step 31, and is installed concentrically at the center of the cylindrical secondary outer punch 56a. It is installed with a certain elasticity to the primary punch plate (54a) with a spring (541a), the secondary inner punch (55a) having a control jaw (552a) on the upper outer periphery, A guide step 561a having the same shape as that of the outer circumferential surface curved surface of the closing tube 33 of the connecting rim 30 to be molded is formed to protrude a predetermined height than the bottom surface 566, and the guide step 561a is formed. Subsequently, a cylindrical rim 562a having the same height as the outer diameter of the connecting pipe 32 of the connecting rim 30 to be formed is formed upward, and the connecting rim 30 to be molded is formed on the upper end of the cylindrical rim 562a. A secondary curved stepped jaw 564 having the same shape as the outer surface of the curved portion bent into the stepped jaw 31) is formed, and then a cylinder having a diameter equal to the outer diameter of the stepped jaw 31 from the upper end of the secondary curved stepped jaw 564. The stepped rim 565 is formed to have a predetermined height, and the upper end of the stepped rim 565 receives a control jaw 551a of the secondary inner punch 55a and guides the guide rim 563a in the vertical direction. The secondary outer punch 56a is formed, It becomes ring-shaped to be fitted to the outer surface of the secondary outer punch (56a), has a predetermined stroke up and down on the secondary punch plate (54a) and is installed in a resilient state stronger than the resilience of the secondary die strippers (53a), Press mold apparatus for manufacturing a connection rim of a flexible connector for a vehicle, characterized in that the lower surface is composed of a secondary punch stripper (57a) is set to a predetermined width lower than the position of the lower surface of the secondary outer punch (56a). Of punches.