DE19807845A1 - Process for pressing metal parts - Google Patents

Abstract

A process for pressing metal parts, e.g. windscreen wiper arms, has the parts formed and held in the metal sheet by bridges of material. At the end of the press operations the parts are separated from the sheet by a cutting tool with the tool support performing a transverse action to remove the burrs left by the cutter. This eliminates any rework and produces a burr free edge for the part.

Description

The invention relates to a method for producing Me tallteile made of sheet metal, especially for wiping devices of windows on vehicles, with the metal parts striding wise from a correspondingly moved in the longitudinal direction Sheet metal strip cut and shaped by punching that they each have a web with one of them Metal tape remaining carrier strips remain connected and only at the end of the molding process Cutting or punching is cut.

A process of this kind for the production of sheet metal parts A wiper device for vehicle windows is an example from DE 35 15 329 A1, which relates to the production of a Fastening part of a wiper arm is directed, or from EP 0 783 999 A1, which relates to the production of a Main bracket of a wiper blade is directed, or from DE 196 15 867 A1, which relates to the production of a Ge steering part of a wiper arm is directed, be  knows. In each of these cases, the finished one is made and possibly painted sheet metal part by cutting egg nes remaining connecting web from a trained Trä separated strips. This separates from the sheet metal part has a separating burr that only remains unprocessed can, if he does not interfere with the finished product. Here but such a ridge mostly bothers because it is damaging neighboring parts or a risk of injury to the It must represent people or affect the design subsequently eliminated in an additional operation become.

So a first problem is a method for Production of such a metal part continues in this way wrap that easy and inexpensive disposal the ridge is included.

The invention further relates to a device for the manufacture make metal parts from sheet metal, especially for wiping Devices of windows on vehicles, the metal divide from one step lengthwise through the successively following working sections of a tool one for the Sheet metal processing suitable press moving sheet metal strip so are cut and shaped so that they each over egg NEN web with a support remaining from the sheet metal strip strips remain connected, and with the metal parts first in the last working section of the tool of the press Cutting the web between one to the lower part of the tool belonging cutting die and one to the upper part of the tool separating stamp belonging as a falling part of the Carrier strips are separated.

DE 35 15 329 A1 states that the sheet metal parts from a gradual lengthwise direction one after the other the following workstations moved sheet metal by punching  and forming are produced, the sheet metal parts to finally over a bridge with an emerging beam stay connected. Only in the last station the bar was cut to complete and assemble ride sheet metal part, here a connection head or fastening part of a wiper arm, as a falling part of the door to solve the stripes. Eliminating the resulting Use burr in the for the production of the sheet metal part Th sheet metal processing device is not provided.

Such device, the one with a corresponding Progressive tool for step-by-step sheet metal processing allowed press are already becoming more common as used by manufacturers of such sheet metal parts.

A second problem of the invention is therefore with simple means a device for the production of Me to further develop tall parts from sheet metal so that they cost one favorable elimination of when separating the connecting bridge separating burr created on the metal part is guaranteed.

The first problem is caused by that in the independent patent Claim 1 disclosed method of manufacturing metal parts released from sheet metal. Special types of execution are disclosed in subclaims 2 to 4.

The first problem is with a method of making Sheet metal parts, in particular for wiping devices of windows on vehicles, with the metal parts striding wise from a correspondingly moved in the longitudinal direction Sheet metal strip cut and shaped by punching that they each have a web with one of them Metal tape remaining carrier strips remain connected and only at the end of the molding process Cutting or punching is cut, solved in that  arises when the web is severed on the metal part whose ridge immediately in the for severing the web executed tool stroke is eliminated. Through this The intended procedure is deburring in the normal procedure of the previous procedure integrated without to take additional working hours. The effort for feeding the metal parts to one separately feeding operation and for carrying out a sol Chen separate operation is omitted.

A special embodiment of the invention according to claim 2 is characterized in that the removal of the ridge by a transverse to the working direction of the tool Separation of the web directed embossing process takes place. This is a particularly rational and simple way of Ent congratulations.

Another special embodiment of the invention according to Claim 3 is particularly applicable when the manufactured metal parts in their processing by last work step on opposite sides with remain connected to a carrier strip.

Another special embodiment of the invention according to Claim 4 is particularly applicable when the process anyway processing multiple metal parts at the same time or a corresponding stride length of the front provides thrust of the sheet metal strip.

The second problem is caused by the in Pa Claim 5 disclosed device for producing Metal parts detached from sheet metal. Special designs for this purpose are disclosed in subclaims 6 to 11.  

The second problem is with a manufacturing device of metal parts made of sheet metal, in particular for wiping devices lines of windows on vehicles, the metal parts one step by length through the successive ones One tool working sections for the sheet metal suitable press moving sheet metal strip so cut out ten and are shaped so that they each have a web with a carrier strip remaining from the sheet metal strip the remain, and the metal parts only in the last Ar section of the tool of the press by cutting of the web between one belonging to the lower part of the tool Cutting die and one belonging to the upper part of the tool Separating stamps each as a falling part of the carrier strip fen separated, solved by the fact that below the Cutting die in the lower part of the tool a catch slide for that separated, falling metal part and an embossing slide for Eliminate when cutting the web on the metal part resulting ridges are arranged and that the required Chen infeed and retraction movements of catch slide and Embossing slide across the stroke of the upper part of the tool by means of a wheel attached to the upper part of the tool tion wedge can be brought about with the catch slide or embossing slide is engaged.

The possible simple and space-saving is advantageous here constructive structure of the device. The operation of the Deburring is carried out by the same last working stroke of the Tool brought about and controlled, in which also that The web is separated. So there is no delay tion of the tool operation of the press, where also the duration of the working stroke of the press or Tool can be maintained. An additional ar so a walkway is not necessary.  

A special embodiment of the invention according to claim 6 is characterized in that the separating stamp is resilient supported on the upper part of the tool, preferred as the separating stamp is equipped with a gas pressure spring. This ensures that in the separation station at downwards outgoing press stroke the web is separated against the spring pressure is, and the separating stamp can, for example by a appropriate stop, after separating the web on egg ner further downward movement are prevented, so as not to To prevent transverse movement of the embossing slide.

Another special embodiment of the invention according to Claim 7 enables the respective control wedge in in an uncomplicated form, since it is simply as in Direction of the lifting movement from the upper part of the tool downwards protruding component can be executed.

By a further special embodiment of the invention According to claim 8, it is possible with only one Control wedge that engages in the breakthrough, both the Delivery as well as the withdrawal movement of the concerned Generate slider.

Another special embodiment of the invention according to Claim 9 is advantageous for separating the Me produced tallteiles of two opposite carrier strips and Eliminate the resulting burrs if it is provided that the metal parts produced in their Processing opposite each other until the last work step lead each side connected with a carrier strip ben.

Another special embodiment of the invention according to Claim 10 is characterized in that the tool Press on two opposite sides of several metal  parts for each metal part with a catch and with an embossing slide and associated control wedges or on two opposite sides of several metal parts each with only one for the corresponding number of me suitable slide gate and with only one for the appropriate number of metal parts suitable embossing equipped with associated control wedges. This embodiment is particularly advantageous bar if the procedure is already processing several Metal parts at the same time or a corresponding step length of the advance of the metal strip.

Another special embodiment of the invention according to Claim 11 leads due to the merger of functions otherwise Most of the required components to reduce the number of required components and thus for further Simplification of the construction of the device.

With reference to the drawing, the Er is below Finding examples described in more detail. Here can mentioned in the claims and in the description Characteristics each individually or in any Combination be essential to the invention. Zei in the drawing gene:

Fig. 1 shows a portion of a sheet metal strip with other aufein following processing sections,

Fig. 2 in vertical section a part of he inventive device,

Figure 3 edit., The positional arrangement of two in the separating portion of the tool to the metal parts,

Fig. 4-6 each in vertical section, the inven tion essential part of the device in different working phases and

Fig. 7-9 in an enlarged schematic representation of various work phases in separating the web and removing the burr.

From Fig. 1 can be seen on the basis of the illustrated area of a sheet metal strip, the individual processes belonging to the process, which are required to gradually produce a metal part 1 of a certain shape and size from a raw sheet metal strip by non-cutting shaping. In the present case, the metal part 1 is a joint part for a wiper arm of a vehicle wiper. The initially ro hey, not shown in Fig. 1 sheet metal strip, but which would be located here on the left side, is gradually fed in the direction of movement B indicated by an arrow, ie in the longitudinal direction of the sheet metal strip, to the individual working gears. In section 2 , the flat sheet metal blanks 3 required for the sheet metal parts 1 are cut out as closely as possible so that they remain connected to the two opposite end faces via a web 4 with the carrier strips 5 formed during cutting. In section 6 , the cut edges of the sheet metal blanks 3 are embossed in order to defuse sharp cut edges. In addition, in this section 6, the sheet metal blanks 3 can also be provided with embossed lettering or other identification. Sections 7 and 8 follow, in which the sheet metal blanks 3 are brought into a three-dimensional shape by bending certain zones of the sheet metal blanks 3 out of the plane of the sheet metal strip. Now the actual shape is closed abge, there are the sheet metal parts 1 , ie the elongated, in cross-section substantially U-shaped joint parts for windshield wiper arms, which are still connected via the webs 4 to the side carrier strips 5 .

In the last section 9 , the operation of separating the webs 4 and removing the ridges 10 formed when cutting through on the metal part 1 takes place ( FIG. 7). According to the invention, the deburring takes place in the same working stroke of the tool intended for severing the webs 4 of a corresponding sheet metal working machine. The detached from the carrier strips on both sides, falling metal part 1 can now be used for its further use.

The advantageous removal of the burr 10 by an embossing process directed transversely to the working direction of the tool when severing the web 4 is shown in FIG. 8 and will be described in more detail later. In Fig. 1 Darge presented section 9 is provided that at the same time, ie in the same working stroke of the tool, the webs 4 on the opposite end faces of the last two metal parts 1 , which opposes each other because of their tapering shape in the longitudinal direction for better material utilization are severed. Likewise, the simultaneous removal of the resulting four ridges 10 is provided.

Furthermore, one is intended to carry out the invention Device suitable for the method and its function more precisely to be discribed.

In the part of a press intended for sheet metal processing shown in FIG. 2, a progressive tool can be seen, the processing zones provided one behind the other in its direction of movement B of the sheet metal strip accordingly the sections 2 , 6 , 7 , 8 , 9 shown in FIG. 1 is trained. The tool has a rigidly arranged lower tool part 11 and a tool with the stamp of the press se for executing lifting movements in the direction of the double arrow 12 connected to the upper tool part 13 , the vertical section of FIG. 2 in the section 9 essential to the invention for severing the webs 4 and removing the ridges 10 is laid. The lower tool part 11 is equipped on its upper side with a cutting die 14 , on which the web 4 to be separated of the now fully formed metal part 1 reaches the cutting position for support when the metal strip is transported in its direction of movement B, ie perpendicular to the plane of the drawing. On the upper tool part 13 a with a gas pressure spring 15 equipped separating plunger 16 is resiliently supported, within the separating plunger 16 a spring-loaded push pin 17 acting on the metal part 1 is also supported. During the downward movement of the upper tool part 13 , the web 4 is severed under the spring force of the gas pressure spring 15 in the interaction of the separating punch 16 with the cutting die 14 . The separated metal part 1 falls down, and the carrier strip 5 initially remains on the cutting die 14 .

Essential to the invention is now a below the Schneidmatri ze 14 in the lower tool part 11 transversely to the lifting movement of the tool upper part 13 slidably arranged slide 18 , which is designed both for the function of a catch slide and for the function of an embossing slide. This slide over 18 is guided so that its feed or Rückzugbewe movement transversely to the lifting movement of the upper tool part 13 and
thereby runs transversely to the direction of movement B of the sheet metal strip. At its end facing the metal part 1 the
Slider 18 a for collecting and holding the falling Me tallteiles 1 trapping zone 19 ( Fig. 8) and one for removing the ridge 10 formed when separating the web 4 formed by an embossing process embossing zone 20 ( Fig. 8). In addition, the slider 18 has an opening 21 in the direction of the stroke movement of the tool upper part 13 , into which an attached to the tool upper part 13 , downwardly projecting control member 22 engages. On the control member 22 are a control wedge 23 ( FIG. 4) for generating the feed and retraction movement of the slide 18 for the function of the catch slide and a control wedge 24 ( FIG. 5) for generating the feed and withdrawal movement of the slide 18 for the function of the pre-slide. During a working stroke of the tool upper part 13 , ie a complete downward and a complete upward movement, the slide 18 is moved by the control member 22 into different positions in order to collect the separated, falling metal part 1 , to pull the end face of the metal part 1 under an embossing process and then by resetting the slide 18 to drop the finished metal part 1 through an opening 25 in the lower tool part 11 . Below the opening 25 , a collecting container or a transport band or the like can be provided.

In Fig. 3 the positional arrangement of two Metalltei len 1 in the last processing zone of the progressive composite tool can be seen, which are to be processed here simultaneously. Accordingly, there are four separating stamp 16 on the upper tool part 13, the cut of the upper die in the same working stroke 13, four bars 4 at the end faces of the two metal parts 1 and freeing so the metal parts 1 from the remaining carrier strip. 5

Compared to the illustration in FIG. 2, the part of the device that is essential to the invention is shown enlarged in FIGS. 4-6. To 13 in FIG. 4 is the upper die part in the downward movement, and precisely in the phase corresponding to the start of the severing of the web 4. The carrier strip 5 and the web 4 lie in the separating position on the cutting die 14 , and the separating punch 16 is just on the surface of the metal part 1 . This situation is also shown in a further enlargement in FIG. 7, the ridge 10 being indicated here for illustration, which actually only arises during the further downward separating movement of the separating stamp 16 on the upper end edge of the metal part 1 . From Fig. 4 it can be seen that the downwardly moving control member 22 with the control wedge 23 has come into engagement with the opening 21 of the slide 18 and by the action of the wedge in question the slide 18 with the capture zone 19 under the end of the metal part 1 has moved, the same thing happens at the not shown, opposite end of the metal part 1 ge. Reference is also made to the stop 26 seen on the lower tool part 11 , whose function in cooperation with the lower edge 27 of the separating punch 16 can be seen from FIG. 5.

In the further downward movement of the upper tool part 13 , the metal part 1 is pressed down under the pressure of the gas pressure spring 15 by the separating stamp 16 . In cooperation of cutting die 14 and separating punch 16 , the web 4 is severed, the unwanted ridge 10 forming on the metal part 1 . The metal part 1 falls, supported by the push pin 17 , down and is caught and held by the catch zone 19 of the slide 18 . The separating punch 16 strikes with its lower edge 27 on the stop 26 and is thus prevented from moving further downward, whereas the upper tool part 13 is moved further downward against the force of the gas pressure spring 15 .

In Fig. 5, the phase of the working stroke of the upper tool part 13 is shown, in which the embossing process for removing the burr 10 is carried out. The separating punch 16 lies with its lower edge 27 on the stop 26 , which prevents the separating punch 16 from obstructing the slide 18 in its continued movement. The control member 22 , with its further control wedge 24, has come into engagement with the opening 19 of the slide 18 and has delivered it to carry out the stamping process against the end face of the metal part 1 . From the enlarged detail shown in Fig. 8 it can be seen that the slide 18 with its specially designed for deforming the ridge 10 formed when separating the web 4 embossing zone 20 is pressed against the end face of the metal part 1 GE. The ridge 10 is deformed so that a defused edge is formed on the front side of the metal part 1 . In Fig. 5 it can also be seen that the push-off pin 17 presses on the top of the metal part 1 and thus helps to keep the metal part 1 in the required position on the slide 18 .

After performing the stamping process, the tool upper part 13 reaches the lowest point of its downward movement and is moved up again to its upper rest or reversal point. The wedge surfaces of the control wedge 24 and the control wedge 23 intended for the retraction function then come into engagement with the opening 19 of the slide 18 . The slider 18 is therefore retracted to its most distant position from the metal part 1 . This situation is shown enlarged in FIG. 9 for clarification. By the retraction of the slide 18 , the metal part 1 is released and can now finally fall down through the opening 25 provided for this purpose in the lower tool part 11 , for example onto a conveyor belt (not shown).

Since only one side of the metal part 1 is shown in FIGS . 2 and 4-9, it is expressly pointed out that the device with existing webs 4 on the sides of the metal part 1 also on both sides of the tool in the is described above. The opposite and opposite to each other be movable slide 18 thus simultaneously form the required abutment during the embossing process. In contrast, if a carrier strip 5 and webs 4 are only provided on one side of the metal parts 1 , then the side of the metal parts 1 opposite the slide 18 must be provided for a corresponding support against the direction of movement of the slide 18 during the embossing process. In this case, advantageously, in the opposite part of the device, a slide similar to the slide 18 with analog mobility can be provided, which instead of the embossing zone 19 has a zone designed as a bearing.

Reference list

1

Metal part

2nd

section

3rd

Sheet metal cutting

4th

web

5

Carrier strips

6

section

7

section

8th

section

9

section

10th

ridge

11

Lower part of the tool

12th

Double arrow

13

Upper part of the tool

14

Cutting die

15

Gas pressure spring

16

Separating stamp

17th

Pull pin

18th

Slider

19th

Catch zone

20th

Embossing zone

21

breakthrough

22

Control link

23

Control wedge

24th

Control wedge

25th

opening

26

attack

27

Lower edge
B Direction of movement

Claims (12)

1. A method for producing metal parts from sheet metal, in particular for wiping devices of windows on vehicles, the metal parts ( 1 ) being cut and shaped step by step from a sheet metal strip which is moved further in the longitudinal direction by punching in such a way that they each have a web ( 4 ) a carrier strip ( 5 ) remaining from the sheet metal strip remains connected and only at the end of the shaping process the web ( 4 ) is separated by cutting or punching, characterized in that when the web ( 4 ) is cut through on the metal part ( 1 ) Enturring ridge ( 10 ) is immediately removed in the tool stroke carried out for severing the web ( 4 ). 2. The method according to claim 1, characterized in that the removal of the burr ( 10 ) by a transverse to the working direction of the tool when cutting the web ( 4 ) directed stamping process. 3. The method according to any one of the preceding claims, characterized in that several ridges ( 4 ) of a metal part ( 1 ), in particular on opposite sides of a metal part ( 1 ) in front of seen ridges ( 4 ), severed and the resultant in one work step burrs ( 10 ) can be removed. 4. The method according to any one of the preceding claims, characterized in that in one step each Weil one or more webs ( 4 ) of several metal parts ( 1 ), in particular on opposite sides of the tall parts ( 1 ) provided webs ( 4 ), severed and the resulting burrs ( 10 ) are removed. 5. Apparatus for producing metal parts from sheet metal, in particular for wiping devices of windows on vehicles, the metal parts ( 1 ) being cut out of a sheet metal strip that is suitable for a sheet metal working from a step-wise sections of a tool ( 11 , 13 ) that are suitable for sheet metal processing and are shaped so that they each remain connected via a web ( 4 ) with a support strip ( 5 ) remaining from the sheet metal strip, and the metal parts ( 1 ) only in the last working section of the tool ( 11 , 13 ) of the press by Zer Cutting the web ( 4 ) between a cutting die ( 14 ) belonging to the lower tool part ( 11 ) and a separating punch ( 16 ) belonging to the upper tool part ( 13 ) are each separated as a falling part from the carrier strip ( 5 ), characterized in that under half the cutting die ( 14 ) in the lower tool part ( 11 ) has a catch slide for the separated, falling Metal part ( 1 ) and an embossing pusher for eliminating the ridges ( 10 ) formed when severing the web ( 1 ) on the metal part ( 1 ) and that he required feed and retraction movements of catch pusher and embossing pusher transversely to the stroke movement of the Tool upper part ( 13 ) by a tool upper part ( 13 ) attached control wedge ( 23 , 24 ) are brought about, which is in engagement with the catch slide or embossing slide. 6. The device according to claim 5, characterized in that the separating stamp ( 16 ) is resiliently supported on the tool upper part ( 13 ), preferably the separating stamp ( 16 ) with a spring, preferably gas pressure spring ( 15 ), is equipped. 7. Device according to one of claims 5 to 6, characterized in that the catch slide and the pre-slide have in the direction of the lifting movement of the tool upper part ( 13 ) extending opening ( 21 ) in which the relevant control wedge ( 23 , 24 ) intervenes. 8. The device according to claim 7, characterized in that the control wedge ( 23 ) for the catch slide and the control wedge ( 24 ) for the embossing slide each have a wedge surface for the generation of the feed movement and a wedge surface for the generation of the return movement, each with the inside of the opening ( 21 ) of the catch or embossing slide cooperate. 9. Device according to one of claims 5 to 8, characterized in that the tool ( 11 , 13 ) of the press on two opposite sides of a single metal part ( 1 ) each with a catch and with a pre-slide and each with an associated Control wedge ( 23 , 24 ) is equipped. 10. Device according to one of claims 5 to 8, characterized in that the tool ( 11 , 13 ) of the press wedge on two opposite sides of a plurality of metal parts ( 1 ) for each metal part each with a catch and with an embossing slide and with associated control ( 23 , 24 ) or on two opposite sides of several metal parts ( 1 ) each with only one suitable for the corresponding number of metal parts ( 1 ) Catch slide and with only one embossing slide suitable for the corresponding number of metal parts ( 1 ) and associated control wedges ( 23 , 24 ) is equipped. 11. Device according to one of claims 5 to 10, characterized in that the catching slide and the pre-slide to a single slide ( 18 ) and the control wedge ( 23 ) for the catching slide and the control wedge ( 24 ) for the embossing slide to a single Control element ( 22 ) are summarized.