WO2016074668A2

WO2016074668A2 - Tool for producing cups, and blanking and drawing press

Info

Publication number: WO2016074668A2
Application number: PCT/DE2015/100478
Authority: WO
Inventors: Wolfgang Schumann; Martin Gaebges; Klaus Blei
Original assignee: Schuler Pressen Gmbh
Priority date: 2014-11-14
Filing date: 2015-11-09
Publication date: 2016-05-19
Also published as: WO2016074668A3; DE102014116701A1

Abstract

The invention relates to a tool for a blanking and drawing press, in particular for producing cups, comprising a cutting tool, which can be driven by a first ram and is designed such that a blank is cut during cutting from a supplied metal strip, a blank holder, which is designed to hold the cut blank down during holding, and a deep drawing tool, which can be driven by a second ram and is designed such that a cup shape is imparted to the held-down blank during deep drawing. A coupling device, which can be decoupled, is mounted between the first ram and the cutting tool and is designed such that the cutting tool is decoupled from the first ram or coupled to the first ram in a controlling manner.

Description

Tool for making cups or cups and cutting and drawing press

The invention relates to tools for a cutting and drawing press, in particular for producing cups or cups made of metal, with a cutting tool operable by a first plunger, which is set up so that when cut from a supplied metal strip a blank is cut out a hold-down tool adapted to hold down the cut blank when held down, and a deep-drawing tool operable by a second push rod, adapted to pull the held-down blank into a cup or cup shape during deep drawing.

[02] A cutting and drawing press, which is also called Cupper, is a double-acting press with a tool for producing cups and cups, from which beverage and aerosol cans are made. In the preparation of the cups or according to the cup is usually with an outer ram a mostly round board, also called Ronde, cut from a sheet, held down and pulled with an inner tappet to the cup or cup (deep). In order to produce many bowls or cups at once with one process step, the tool is provided several times in the press. However, this often leads to the fact that the metal sheet from which the individual discs are cut are not fully utilized. In this case, either the remaining sheets are recycled or used with an offset the previously not cut out areas for the production of other wells or cups.

[04] It may happen that cutting and holding down take place at a point where a round blank has already been cut out. However, material inhomogeneities can occur at the cut edges which wear the cutting or cutting tool more than in the uncut state. As a result, the cutting or cutting tools need to be replaced earlier.

[05] The object of the invention is to improve the state of the art.

The object is achieved by a tool for a cutting and drawing press, in particular for producing cups or cups made of metal, with a operable by a first ram cutting tool, which is arranged such that when cutting from a supplied metal strip a Ronde is cut, a hold-down tool, which is set so that when holding down the cut Ronde is held down, and operable by a second plunger deep-drawing tool, which is arranged such that in a deep drawing the held Ronde in a cup or cup shape is drawn, wherein between the first plunger and the cutting tool a decoupled coupling device is arranged, which is arranged such that controlling the cutting tool is decoupled from the first plunger or coupled to the first plunger.

[07] The cutting and drawing press can be used to deactivate the cutting tool. Thus, no cutting operation is performed on an already cut out point of the metal strip, so that in this respect the cutting tool is spared. This means that the cutting tools must be replaced less frequently and thus reduce the life of the cutting and drawing press or increase the maintenance intervals accordingly.

[08] The following conceptual is explained.

[09] In the present case, a "tool" is in particular a molding tool which imparts a defined shape to a workpiece by means of a cutting and drawing press and / or pulls the workpiece and / or supplementary functionalities such as ejection of a workpiece by means of the press Workpiece, realized.

[10] A "cutting and drawing press" is in particular a double-acting press for making cups or cups from which beverage and aerosol cans and / or metal bottles are made the cutting process as well as the actual deep drawing of the cups, bowls and / or bottles.

[11] A "plunger" is in particular a component which is displaceable by means of the press and imparts a pressing force to a component in operative contact with the plunger The distance traveled by the plunger is referred to herein as a plunger stroke The first plunger moves the cutting tool in operative contact In the present cutting and drawing press, in particular the ram stroke of the second ram is greater than the ram stroke of the first ram In the case where the first plunger is an outer plunger and the second plunger is designed as an inner plunger, in particular a double-acting cutting and drawing press can be provided.

[12] The "cutting tool", also called cutting tool, has in particular a punching knife, which imposes a force on the metal strip with the corresponding counter-tool, which causes the blank to be "cut out". In the present case, the term cutting also includes the term stamping. In general, all separation processes are included which separate a blank from a metal sheet or metal strip. [13] The "hold-down tool" acts in the

Hold down the cut round blank or parts of the blank with pressure and presses this in particular against a counterpart, so that the Ronde is fixed virtually clamped. This allows the deep drawing tool of the retained blank to impart a shape having high dimensional accuracy and quality.

[14] The "deep-drawing tool" draws the cut-out blank into a desired target shape, in particular by means of a press, which is referred to in particular as a deep-drawing operation.

[15] In the case of the tools described, the respective antidote is included. This means that, for example, in the cutting tool, the corresponding antidote is provided, so that the cutting can take place. Also, the counter-mold for the thermoforming tool is also included, so that by the interaction of counter-mold and a punch (arranged on the inner tappet) the actual (target) shape of the blank is impressed.

To the hold-down tool also counts according to the counter-mold, which opposes the pressing force of the hold-down tool a counter force, so that the round is braced in this regard.

[17] In particular, the "decoupled coupling device" can switch between two states: in the first state (activated or coupled state), the plunger stroke of the first plunger is for the most part transferred to the cutting tool, so that the blank moves out of the Sheet metal can be cut. The second state (deactivated or decoupled state) results in that the ram stroke of the first ram is substantially not transmitted to the cutting tool, so that the cutting edge of the cutting tool does not make contact with the metal sheet.

[18] "controllable" is understood to mean, in particular, that due to an external (control) signal, for example a machine control, the cutting tool is coupled to the first plunger or decoupled accordingly, so that the cutting tool can be activated or deactivated depending on the process parameter.

[19] In another embodiment, the first plunger additionally operates the hold down tool and the decoupled coupling device disposed between the first plunger and the hold down tool such that the hold down tool is controllably decoupled from the first plunger or coupled to the first plunger.

Thus, damage to the

Hold-down tool to be avoided at already punched out or corresponding cut-out points of the metal strip.

[21] In particular, in a related embodiment, the hold-down tool is spring-loaded so that the force acting on the blank is reduced and the blank is correspondingly protected against deformation by the hold-down tool. [22] In order to form a mechanically simple decoupled coupling device, it can have two prongs which are displaceable relative to one another by means of a translating device, which prongs are associated with one another in a coupling state and are offset from one another in a decoupled state.

[23] In the present case, "prongs" are also understood to mean teeth and teeth, whereby it is important for the opposing teeth to form an effective contact through the first plunger, so that the corresponding stroke is impressed on the cutting unit pull and / or the hold-down tool so that the cutting tool engages the teeth Cut the blank out of the sheet metal and / or the holding down tool can hold the blank.

[24] The "translation device", for example, move the tines to each other by means of servo motors.

[25] In the state in which the tines are offset from each other, in particular a ram stroke of the first ram causes the tines are not in operative contact and optionally guided in a corresponding recess.

For example, the prongs may also be the webs of a U-profile, in which case in the coupled state, the webs face each other and form an active contact and in the mutually staggered state one web in each case enters the recess of the other U-profile, so that the cutting tool and / or the hold-down tool is deactivated. In a further embodiment, the decoupled coupling device further to each other by means of the translation device displaceable prongs, which form a comb strip. In particular via the tines feasible contact surface can be influenced on a choice of material of the tines.

[28] In order to protect the blank from excessive pressing pressures, the hold-down tool may have a catching device.

[29] In a further embodiment, the tool has further rams, further hold-down tools, further deep-drawing tools and / or in particular further ones

Coupling devices on. These can each be configured as previously stated.

Thus, a tool for a cutting and drawing press can be provided with which several wells or cups can be produced in one process step.

Thus, in this case, so-called odd divisions can be driven so that in already punched round holes the cutting and / or hold down tool can be disabled. This allows a high yield of cups or cups from the supplied metal strip. Thus, the waste to be recycled later can be reduced.

[32] In a further embodiment, the first plunger or the further plungers are outer plungers and / or the second plunger or are the further plungers Interior tappers designed. Thus, by means of the tool a double-acting cutting and drawing press can be provided.

[33] An "inner tappet" is in particular a tappet, which is guided within an "outer tappet".

[34] In a further aspect of the invention, the object is achieved by a cutting and drawing press, which has a previously described tool.

[35] In order to be able to access the cutting tool and / or the hold-down tool in particular, the cutting and drawing press may have a machine control which controls or decouples the cutting tool and / or the hold-down tool.

[36] In particular, this machine control sets corresponding parameters such as

Press speed or conveyor speed and positions of the supplied metal strip to. In particular, all the previously blanked blanks and their position are already known to the machine control, so that when the metal strip is fed in, the cutting and / or holding down tools are deactivated, which would realize cutting and holding down in spite of the blanks already cut out.

[37] In another embodiment, the cutting and drawing press has a metal strip to be cut and deep-drawn. [38] Thus, the cutting and drawing press is able to produce appropriate cups and cups. The metal strip may consist of different materials or composite materials. To be favoured

Aluminum bands or steel bands used.

[39] In a final embodiment, the cutting and drawing press has a securing device with a sensor, which is in particular an optical sensor, and the safety device is designed such that when a pressing material is detected, the decoupling of one of the cutting tools and / or or one of the hold down tools is prevented or reset by the associated follower.

[40] In the event that machine control in particular assumes that a blank has already been cut from the metal strip, but this is not or not completely the case, the cutting and drawing press can be protected from extreme damage. This is realized in particular by the fact that, if it is detected by the sensor, the material is unexpectedly present, then both the cutting and the holding down takes place and then the cup or the cup is produced by deep drawing.

[41] If this were not the case, in particular, only deep-drawing would take place without cutting. This leads to a considerable damage and warping of the metal strip and thus the other other tools used. [42] The sensor is in particular an optical sensor, such as a camera, which monitors the corresponding positions. The safety device also includes software and hardware technical means which evaluate the sensor according to and reset or override a control signal.

[43] In the following, the invention will be explained with reference to the single FIGURE 1. It shows

Figure 1 is a schematic sectional view of a section of a tool of a cutting and drawing press with a cutting tool, a hold-down tool and a

Deep-drawing tool.

[44] A cutting and drawing press has a tool 101 with a cutting device 103 and a hold-down 105. The hold-down 105 is spring-loaded by the hold-down spring 107. Both the cutter 103 and the hold-down 105 are connected to the connector 109.

The connector 109 has a slide rail (not shown) on which a U-shaped comb bottom 111, 112 is slidably disposed. The displacement takes place by means of servomotors (not shown). The U-shaped comb base each has a U-shaped comb top 113 associated therewith. This U-shaped comb top 113 is fixedly connected to the outer plunger 115. [46] Within the outer tappet 115, the inner tappet 117 is guided. The inner tappet 117 also acts as a stamp. A printing table 123 has the corresponding to the punch of the inner plunger 117 cup shape 125, so that from the supplied metal strip 121 by pressing the inner plunger 117 in Tiefz direction of expulsion 133, the resulting form of cup 125 and punch form.

[47] The tool-forming counterpart to the cutting device 103, which forms the cutting tool together with the cutting device 103, is also arranged in the printing table 123 and not shown.

[48] If now the metal strip 121 made of aluminum in the transport direction 131 is guided via a transport device (not shown), it is deposited on the printing table 123 in such a way that a blank can be cut out of the metal strip 121.

[49] For this purpose, the U-shaped comb-bottom piece 111 is displaced into operative contact with the U-shaped comb overpiece 113. Subsequently, the outer tappet 115 hits the U-shaped comb base 111 via the U-shaped comb top 113. The force of the outer tappet 115 is impressed on the cutting device 103 and the hold-down 105 via the connecting piece 109. Both the hold-down 105 and the cutting device 103 move in the cutting and hold-down direction 135.

[50] First, the hold-down 105 comes in touching contact with the metal strip 121. By means of this contact, the metal strip 121 on the printing table 123 becomes clamping fixed. Subsequently, the cutting device 103 comes into operative contact with the metal strip 121 and cuts with the provided in the printing table 123 counterpart (not shown), the Ronde as a circular disc from the metal strip 121st

[51] Subsequently, the inner plunger 117 moves in Tiefz direction of 133 and pulls the held by the hold-down 105 Ronde in the cup shape 125. Subsequently, the inner plunger 117 and the outer plunger 115 is operated opposite and the forming cup

(not shown) is ejected.

[52] In the following, the case is explained in which a circular blank has already been cut from the metal strip 121.

[53] The machine control (not shown) is known that the now present metal strip 121 already at the position of the cutting device 103 and the inner plunger 117 has a cut Ronde.

[54] In order to deactivate the cutting device 103 and the hold-down 105, the U-shaped combunit 111 is displaced in the displacement direction 137 on the displacement rail of the connecting piece 109, so that there is an offset U-shaped combunit 112.

[55] Now, when the outer plunger 115 moves in cutting and hold-down direction 135 engages one leg of the offset U-shaped comb base 112 and the U-shaped comb top 113 in the respective voids of the opposite Kammunter- or upper piece 112, 113. Thus, the Ram stroke no movement of the Cutting device 103 or the blank holder 105. The cutting device 103 and the hold-down 105 are deactivated.

[56] The fact that the inner tappet 117 is moved in the direction of deep drawing 133 is hereby accepted and is not critical.

Reference sign list

101 tool

103 cutting device

105 hold down

107 hold-down spring

109 Connector with sliding rails

111 U-shaped comb piece

112 staggered U-shaped comb piece

113 U-shaped comb top

115 outer tappets

117 inner tappets

121 metal band

123 printing table

125 cup shape

131 Transport direction of the metal strip

133 Depth direction of the inner tappet

135 Cutting and hold-down direction

137 Shifting direction of the U-shaped comb bottom piece

Claims

Claims:

A tool (101) for a cutting and drawing press, in particular for producing cups or beakers of metal, with a cutting tool (103) which can be operated by a first plunger (115) and which is set up in such a way that it is fed from a feed Metal strip (121) a blank is cut out, a hold-down tool (105) which is arranged such that when holding down the cut blank is held down, and a by a second plunger (117) operable deep-drawing tool, which is arranged such that at a Deep drawing the held Ronde is drawn into a cup or cup shape, characterized in that between the first ram and the cutting tool a decoupled coupling device is arranged, which is arranged such that the controlling the

Cutting tool from the first plunger decoupled or coupled to the first plunger.

2. Tool according to claim 1, characterized in that the first plunger is arranged such that it additionally operates the hold-down tool and the decoupled coupling device between the first plunger and the hold-down tool is arranged, so controlling the hold-down tool from the first plunger decoupled or with the first Pestle is coupled.

3. Tool according to one of the preceding claims, characterized in that the decoupled coupling device comprises two mutually displaceable by means of a translation device prongs, which are associated with each other in a coupling state and are offset from each other in the decoupled state.

4. Tool according to claim 3, characterized in that the decoupled coupling device has further mutually displaceable by means of the translation device tines, which form a comb strip (111, 112, 113).

5. Tool according to one of the preceding claims, characterized in that the hold-down tool has a catching device (107).

6. Tool according to one of the preceding claims, characterized by further plunger, further hold-down tools, further thermoforming tools and / or in particular further coupling devices.

7. Tool according to one of the preceding claims, characterized in that the first plunger or the further plunger is designed as an outer plunger and / or the second plunger or the further plunger as inner plunger or are.

8. cutting and drawing press, which has a tool according to one of the preceding claims.

9. Cutting and drawing press according to claim 8, characterized by a machine control, which controls the cutting tool and / or the hold-down tool coupled or decoupled.

10. Cutting and drawing press according to one of claims 8 or

9, characterized by a metal strip (121) to be cut and deep-drawn.

11. Cutting and drawing press according to one of claims 8 to

10, characterized by a securing device with a sensor, in particular optical sensor, wherein the securing device is designed such that when a detected pressing material decoupling of one of the cutting tools and / or one of Holding down tools and the associated plunger is prevented or reset.