CH628541A5 - Machine for cutting and deburring an upset workpiece - Google Patents

Description

628 541

PATENT CLAIMS I. Machine for cutting and deburring a compressed workpiece, in particular the head of a compressed bolt, with a die that can be moved back and forth, with means that are driven by a drive and serve to generate the movement of the die, with one opposite the die and movable push-out pin, which is connected to a two-armed lever with a fixed pivot point, which lever is actuated by a rotatable cam connected to the drive, which push-out pin has two telescopically arranged parts which are spring-biased towards one another, such that that the ejector pin is biased against its longest state in which it ejects a finished workpiece, characterized in that the working angle of rotation of the cam (15) is divided into a fixed number of parts which are in a fixed ratio to one of one with the Nokken (15) coupled electronic pulse generator er (25) during the cutting and deburring process, the number of pulses given means that the push-out pin has an actuating element (22) which can be moved, and which has a scanner (21) connected to an electronic pulse counter (31) at the beginning and at the end of the movement of the push-out pin , or 23) actuates which pulse counter (31) is connected to the pulse generator (25), that an adjusting device (26, 27) is provided, which serves to lower and the upper limit of the during cutting and deburring to determine the permissible number of pulses delivered and to compare the actually delivered number with the defined lower and upper limit value, that a device (28) is present which registers the number of incorrectly cut and deburred workpieces and emits a signal when a maximum number is reached, and that there is an electromagnetic device (29) which, after receiving the signal from the Switch off the registration device (28) at least part of the machine.

The present invention relates to a machine for cutting and deburring a compressed workpiece, in particular the head of a compressed bolt, with a die that can be moved back and forth, with means driven by a drive that serves to generate the movement of the die, with one that is opposite the die , to and fro movable ejector pin, which is connected to a two-armed lever with a fixed fulcrum, which lever is actuated by a rotatable cam connected to the drive, which ejector pin has two telescopically arranged parts which are spring-biased towards each other, such that the push pin is biased against its longest state in which it ejects a finished workpiece.

The greatest number of malfunctions occur in multi-station pin upsetting machines due to defective deburring. If an incorrectly deburred workpiece is produced, damage to thread rolling machines or machine parts can occur. This is mainly the case with machines with different processing stations, in which a feed movement by means of a feed member is used to bring the workpieces from one station to the other station.

In such machines, the deburring usually takes place in a last cutting and deburring station, the round head formed in the previous stations being given the desired final head shape by means of cutting processing, usually a hexagonal or square shape. The cutting processing and deburring take place by a movable cutting die pressing the workpiece against a stationary punch and thereby cutting the raw, round head of the workpiece in the desired shape and by a movable deburring pin pushing the workpiece through the cutting die. Due to the cutting processing, most of the malfunctions that occur in the machines mentioned will occur in the deburring station, e.g. by the deburring die becoming blunt or by pieces breaking out of it.

The aim of the invention is to signal every incorrectly deburred workpiece and to take automatic measures,

by which the machine or part of it is switched off to prevent further damage.

The machine according to the invention is characterized in that the working angle of rotation of the cam is divided into a fixed number of parts which are in a fixed ratio to a number of pulses emitted by an electronic pulse generator coupled to the cam during the cutting and deburring process, that the push-out pin has an actuating element which can also be moved and which actuates a scanner connected to an electronic pulse counter at the beginning and at the end of the movement of the push-out pin, which pulse counter is connected to the pulse generator, that an adjusting device is provided which serves to lower the lower one and to set the upper limit of the number of pulses delivered during cutting and deburring and to compare the actually delivered number with the specified lower and upper limit that there is a device which can detect the number of incorrectly cut and cut Workpieces registered and emits a signal when a maximum number is reached, and that an electromagnetic device is present which serves to switch off at least part of the machine after the signal has been received by the registration device.

The invention can be applied to various bolt-upsetting machines. These can e.g. Upers or combined bolt upsetting machines that have a conveyor carriage that conveys the workpieces from one processing station to the other processing station.

The invention is explained in more detail below with the aid of an embodiment. It shows:

1 is a longitudinal sectional view of the cutting and deburring station of a machine on which an embodiment of the invention is based and with the cam in a position which corresponds to the start of deburring.

2 shows a longitudinal section similar to that of FIG. 1, but in a position of the cam which corresponds to the end of the deburring,

3 shows a longitudinal section of the deburring tools at the time at which the deburring die begins cutting, that is to say at the beginning of the first part of the deburring,

4 is a longitudinal section similar to that of FIG. 3, but at the end of the cutting movement of the trimming die and with the main slide in the front position and at the beginning of the preceding movement of the trimming expression pin, the second part of the cutting beginning,

Fig. 5 is a longitudinal section similar to that of Fig. 4 at the end of deburring, with the deburring pin in the extreme front position, and

Fig. 6 is a block diagram of the device according to the invention.

The device and the effect of the cutting and deburring station in a pin upsetting machine on which the invention is carried out are first described below.

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The cutting and trimming die 1 is held by means of a filling sleeve 2 in a holder 3, which in turn is carried in a holder 4 which is connected to a main slide 5. The main slide 5 is arranged to be movable back and forth in a bearing 5 'of the machine. The back and forth movement is generated by means of a drive rod 6 and a crankshaft 7.

The trimming punch 8 is inserted in a holder 9 and thus connected to a frame part of the machine. In this deburring stamp there is the push-out pin 10 for the deburring, which is given a reciprocating movement by means of an arm 12 and a pressure pin 11, the compression spring 13 generating the returning movement.

An arm 12 is pivotable about a bearing pin 14, the pivoting movement being generated by rotating the cam 15, which is arranged on a shaft 16, which shaft 16 is connected to the crankshaft 7 by a gear mechanism (not shown).

If a workpiece has now been brought in front of the deburring die 8 by a feed element (not shown) of the machine, it is inserted into the deburring die 8 by the main slide 5 by means of the deburring die 1 (see FIGS. 1 and 3). During the last part of the forward movement of the main slide 5, the deburring die 1 cuts the head of the workpiece into the desired shape for the most part of the head height. 4, the head of the workpiece is cut to 90% of the head height in a hexagon shape. Only 10% of the head height is not cut by the main slide movement.

4, the main slide is in the maximum advanced position. At this moment, the deburring pin 10 is advanced by means of the Andriick pin 11, the arm 12 and the cam 15, whereby the workpiece is pushed out of the deburring die 8 and the remaining part of the head is cut into a hexagonal shape, which deburr machining is called.

At the point in time at which the deburring pin 10 almost reaches the foremost position and is no longer driven by the cam 15, the compression spring 18 acts on the pin 17 seated in the pin 11, whereby the burr pin 10 gives additional acceleration through which the workpiece is forcefully pushed completely through the trimming die 1, as shown in FIG. 5. The cut ridge or beard 19 remains behind and falls down and out of the machine when the main slide executes its backward movement.

Reasons that the burring does not take place correctly can e.g. be that the trimming die 1 is no longer sufficiently sharp or that parts have broken out of the trimming die 1. The consequence of this is that the workpiece can no longer be pressed through the deburring die 1 by means of the deburring push-out pin 10, 11, because the force of the compression spring 18, which is located behind the deburring deburring pin 10, is not sufficiently great for this. The consequence of this is that the workpiece remains in the trimming die 1 and, during the subsequent feed movement of the main slide 5, bumps against the subsequent workpiece which has been pushed in front of the trimming punch 8 by means of the feed element (not shown). This could damage or destroy the feed element, the trimming punch and / or the trimming die.

From the above it can be seen that the machining for the shaping of the head of the workpiece actually takes place in two steps, the first step taking place during the last section of the feed movement of the main slide 5 when the trimming die 1 partially shapes the round head of the workpiece into the desired shape cuts. The second step of deburring takes place when the deburring pin 10 completely pushes the workpiece out of the deburring punch 8 through the deburring die 1.

This second step of deburring therefore begins when the deburring pin 10 begins its outward movement and ends when it has reached the outermost front position.

By means of the device according to the invention, the movement of the above-mentioned push-out pin 10, 11 is now tracked electronically, in that as long as the movement lasts, a number of pulses are supplied to an electronic device 20 by means of an electronic pulse generator 25 (FIG. 6). These pulses are derived from the rotational movement of the shaft 16 on which the cam 15 is arranged. The movement of the shaft 16 is generated by the crankshaft 7 by means of a gear transmission (not shown) or another device.

If a cutting edge of the cutting and trimming die 1 is now worn out, the penetration of the bolt head into it is difficult. As a result, the spring 18 will not be able to relax because it is not strong enough. The result of this is that the scanner 23 is actuated by the disk 22 much later. The spring 18 causes an advance of the rod 10 and the disk 22 in relation to the movement of the part 11 of the pressure pin in the trouble-free case. The time span that is necessary and consequently the number of pulses that are emitted by the pulse generator in order to move the disk from the scanner 21 to the scanner 23 will therefore be greater if the spring cannot relax directly. This direct relaxation of the spring 18 is only possible with a perfectly cutting cutting and trimming die 1, because then the spring 18 can simply push the bolt through the opening in the die. With a poorly cutting, e.g. B. worn die, the spring would have to apply additional force for cutting and deburring, but is not able to apply it. If the bolt is stuck in the trimming punch for any reason, either the pin 10 must break or the arm 12 must bend. However, the arm 12 is usually provided with a predetermined breaking point, a breaking bolt which breaks in such a condition. However, the final result remains the same in this case as well: the disk 22 will only reach the scanner 23 much later or not at all.

The spring 18 thus plays the role of an elastic intermediate link in the transmission chain cam 15, lever arm 12, pin 11, pin 10 and causes the pin 10 to lag in the event of a fault. Conversely, the spring 18 can also cause the pin 10 to advance if the cutting edges of the cutting and deburring die 1 are so perfectly sharp that the bolt can be snapped through the die 1.

The last 10% of the relative displacement path between the die and the push-out pin when cutting or deburring are generated by the cam 15. There are thus two possibilities with regard to the continuous movement of the bolt through the die 1. In the case of a die 1 which cuts well, the spring 18 will relax and the part 17 and the pin 10 will advance, so that the disk 22 quickly moves against the scanner 23 moves. In the case of a poorly cutting die, the pin 11 must drive the pin 10 forward because the spring 18 is compressed due to the excessive cutting force and the excessive friction of the bolt head in the die 1.

Consequently, the disk 22 reaches the scanner 23 much later.

To determine the beginning of the deburring, that is, the beginning of the outward movement of the deburring pin 10, 11. there is a scanner 21 in the holder 9 an5

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is arranged and which is switched at the point in time when the switching disc 22, which is arranged elastically on the pin 10, away from the scanner 21, that is to say at the point in time at which the deburring pin moves forward. The end of the deburring is determined when the switching disc 22 comes to rest against the scanner 23 present behind the deburring punch 8, that is to say at the point in time at which the deburring pin 10, 11 reaches its forward position. If the burring has taken place properly, these processes correspond to the positions I and XIII of the shaft 16 and cam 15, respectively.

The electronic device 20 has a number of setting and locking options.

With the setting 24, a number of pulses is set and stored in the memory, which is to be received when a workpiece is cut properly, that is, when the deburring pin 10, 11 moves forward when the shaft 16 or the cam 15 assumes position I, and when the outermost front position is reached, when the shaft 16 or the cam 15 is in position XIII.

The pulses are emitted by an electronic pulse generator 25, which is drive-connected to the shaft 16, or, in an alternative embodiment, is drive-connected to the crankshaft 7. The electronic pulse generator 25 can also be arranged directly on one of the shafts mentioned and connected to it in a rotationally fixed manner.

With the setting and locking device 26, the so-called lower limit is set and determined. This means that the number of pulses is determined here which is lower than the number set with the setting device 24, which may be received if the deburred workpiece is still acceptable. This is the case in the state in which the deburring pin 10, 11 only moves forward when the shaft 16 or the deburring cam 15 has already passed position I, or when the deburring pin 10, 11 has reached the position has reached the front position before the shaft 16 or the trimming cam 15 has reached the position XIII.

With the setting and locking device 27, the so-called upper limit is set and determined. Here the number of impulses is indicated which is higher than the number which can be received with the setting device 24 and at which the cut workpiece is still acceptable. This is the case when the burring ends when the shaft 16 or the cam 15 has already passed position XIII.

Furthermore, an adjusting device 28 is also arranged, which serves to adjust the number of incorrectly deburred workpieces from a predetermined, still acceptable amount, which number depends on the demands made. They are workpieces of which the number of pulses received is lower than the lower limit set in the setting and locking device 26, or higher than the upper limit set in the setting and locking device 27.

If the number of defective products is higher than the number set in the setting device 28, which can also be zero, a pulse is supplied to an electromagnet 29 which switches off a certain part of the machine, e.g. the feed element, as a result of which no new workpieces are fed in, so that a workpiece which has remained in the trimming die 1 can cause no further damage 5 to the machine. A signal indicating a fault can then also be emitted. The effect of the device according to the invention is as follows:

First, the predetermined nominal number of pulses for a perfectly deburred workpiece is set on the setting device 24 of the electronic device 20, which

Number is stored in the memory of the device 20. 6, this number is 560.

The setting and locking devices i5 26 and 27 are used to set and determine the lower or upper limit, which are dependent on the requirements. 6, these are numbers or 550 and 570. It is obvious that the closer the lower and upper limits set to the nominal number of pulses set with the 20 setting device 24, the better the quality of the deburred workpieces.

Thereafter, the permitted number of incorrectly deburred workpieces is set with the setting device 28. So the 25 number, of which the received number of pulses is higher or lower than the set lower or upper limit.

When workpieces are deburred, the electronic pulse generator 25 indicates from the point in time at which the deburring push-out pin 10, 11 moves forward, i.e. when the switching disc 22 leaves the scanner 21 and the actual deburring begins until the point in time since this is ended in each case, that is until the switching disk 22 abuts against the scanner 23, from a number of pulses to the electronic device 20. The device counts the received number 35 pulses via the counters 30 and 31 and compares this with the number of pulses stored in the memory of the device or with the settings 26 and 27. Is the number received! Pulses equal to the set nominal number of pulses or if the number of received pulses is within the range of the upper and lower limits set, the workpiece is deburred properly or does it still meet the requirements.

However, if the number of pulses received is below the lower limit or above the upper limit, 45 this is determined in the setting device 28. If the number of incorrectly deburred workpieces is higher than the number set and determined with this setting device, a pulse is supplied to an electromagnet 20, which then switches off part of the machine or possibly the entire machine.

If the setting device 28 is set to zero, a part of the machine is switched off for each incorrectly deburred workpiece and a signal can also be emitted. This signal is the signal for the machine operator 55 that the trimming die 1, the trimming punch 8 or another part of the machine is subject to excessive wear and / or is damaged, after which this part can be replaced.

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2 sheets of drawings