JPH035032A - Method and device for molding by compressing each part by using strip material - Google Patents

Abstract

PURPOSE: To improve productivity by feeding strip stocks from several pieces of coils to a drawing press and making a composite feeding speed coincide with the producing speed of the above described drawing press. CONSTITUTION: Plural strips 1, 1A are fed to a cutting device 5 from different coils 2, 2A. The strips are cut into pieces 15, 15A, 15B of the strips whose lengths coincide with each part to be machined by the cutting device. These pieces of each strip preliminarily cut are transported to standby positions 9, 9A, 9B to form a buffer storage part 6. These pieces of the strips stored in the standby position are taken out one by one so as to be successively transported in the downside of each machining stations 11, 11A to 11D of the drawing press 8. Thus, since the strip stocks from plural coils are fed to the drawing press, feeding at a high producing speed becomes possible by making the composite feeding steed coincide with the producing speed of the above described drawing press.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for forming parts by compression from precut strip material.

The invention generally finds application in the field of mechanics, ie, in the field of constructing hardware.

[Conventional technology]

BACKGROUND OF THE INVENTION In many fields, it is common practice to machine parts by compression from strip material stored in the form of coils. A reel disposed at the beginning of this device therefore controls the unwinding of said strip, which is then cut into sections whose length is determined by the part to be machined. guided towards the cutting unit.

Each portion of these pre-cut strips is then conveyed to the underside of a press and subjected to one or more compression operations.

In this regard, when it is necessary to perform several compression operations on one part, the underside of the same press is equipped with several molds corresponding to each compression operation to be performed. It must be noted that advancing this part is done frequently.

This technology has made it possible to develop presses with particularly high production volumes. Of course, many problems arise insofar as their supply, which has to be at the same speed, is concerned. Difficulties thus arise when the implemented strip material is of the metallic type. It is true that in these circumstances it is generally necessary to straighten said strip as it exits the coil so that after cutting a substantially straight (5) (6) strip piece is obtained. This effect slows down the unwinding of the strip of metal material and thus slows down the feed rate of the press. Furthermore, it must be taken into account that the coil from which the strip material emerges is particularly heavy and has a non-negligible inertia at the start of rotation and at the time of braking. This becomes an even more difficult problem when the unwinding of these coils occurs sequentially and non-sequentially.

OBJECT OF THE INVENTION In fact, the aim of the invention is to overcome this difficulty when feeding parts from strips into a press at high production rates.

[Means to solve the problem]

In general detail, the present invention relates to a method of forming sections from pre-cut strip material by compression;
The method comprises the steps of: feeding a cutting device with several strips coming out of different coils and forming strip pieces whose length corresponds to each part to be machined; the strip fragments stored in the waiting position are conveyed one by one to the underside of various machining stations of the drawing press, forming a buffer storage; It is characterized by comprising the steps of:

The invention also relates to a device for carrying out this method, which device comprises: a first transport means for conveying one or several pre-cut strip pieces from the cutting device to a waiting position at the inlet of the drawing press; second transport means capable of transporting the strip pieces one by one in sequence to the underside of each machining station of the drawing press.

(7) (8) [Effects of the Invention] The advantages obtained by the present invention are substantially the same as those obtained by feeding a drawing press with several coils of strip material and matching this combined feeding rate to the production rate of said drawing press. It's about being able to make things happen.

Other objects and advantages of the present invention will become apparent through the following description. However, the following description merely represents one embodiment and is given by way of example only and is not limiting.

〔Example〕

A description of the invention will be facilitated below with reference to the accompanying drawings.

With particular reference to FIG.

The present invention relates to a method for forming parts by compression from pre-cut strip material. In more detail,
Said strip 1 of metallic type is initially stored in the form of a coil 2. This coil is placed on a reel, which is preferably ensured to rotate sequentially so as to unwind the strip 1. This strip first
After cutting, the strip pieces obtained are passed through an enlarger 3 in such a way that they are substantially straight. Finally, the strip l is inserted into the threader 4 which ensures entry into the cutting device 5 according to a predetermined length corresponding to the length of each part to be machined.

In practice and according to a feature of the method according to the invention, the cutting device 5 includes several strips 1. IA is provided so that this feed rate is substantially increased.

As mentioned above, the supply of a single strip to the drawing press is quite insufficient for this press to operate at maximum production speed, since the material provided is stored in the form of particularly heavy coils. This has actually become clear.

However, several strips 1. Supplying IA (9) (10) In the scope of the configuration, the transfer of the various strip pieces 15, 15A one by one from the cutting device 5 to the drawing press 8 is a problem.

The invention provides that these strip fragments 15.1 emerging from the cutting device 5 between the cutting device 5 and said drawing press 8
This problem is solved by ensuring a 5A buffer reservoir 6. This takes the strip pieces 15.15A one by one from their waiting positions 9.9A, 9B and transfers these pieces to one machining station 11. 11A, 11B to the other machining station under the drawing press 8 in sequence.

The invention also provides an apparatus 1 capable of carrying out the above method.
Regarding 4. This apparatus is shown schematically in FIG. 1 and in further detail in the following FIGS. 2 to 6.

Therefore, as already described, each strip 1. The IA is first fed to the cutting device 5 so as to form strip pieces 15.15A, the length of which is determined by the last part to be machined.

From this cutting device 5, these strip pieces 15, 15
A are removed according to the invention by the first transport means 16 so that these pieces are conveyed into a waiting position 9° 9A at the inlet 17 of the drawing press 8. In fact, this purpose is to draw this population 17 of the drawing press 8
A buffer reservoir 6 is formed in the region of , so that the drawing press can be fed at a high speed.

Preferably, the first transport means 16 is, for example, a cutting device 5.
It is formed by at least two arms 18 extending upwardly and having at their upper edge 19 a recess 20.2OA capable of receiving a respective simultaneously cut strip segment 15.15A.

These arms 18 are further subjected to a cyclic movement including a lifting movement for removing said strip pieces 15.15A in the region of the cutting device 5, which lifting movement includes:
A horizontal movement is then followed by a downward movement, which brings these strip pieces 15.15A into their waiting position 9,9A.
so that it is placed again.

(11) (12) These standby positions are, for example, recesses 21.21A provided in the table 22 disposed on the front side of the cutting device 5.

Corresponds to 21B. These arms 18 then undergo a second horizontal movement and cut the next strip section 15' of the cutting device 5.
, so that it returns to its initial position below 15A'.

However, these arms 18 are separated by strip segments 15.
It should be noted that 15A can be replaced by a clamp (fastener) with a cyclic movement for transferring it from the cutting device 5 to its standby position 9, 9A.

These first transport means 16 can furthermore be formed by transport belts provided with means for supporting the strip segments 15.15A and having a forward movement of the sequential type.

According to another feature of the invention, the device 14 further comprises:
The strip pieces 15.15A, 15B are taken out one by one from their standby positions 9.9A, 9B and these pieces are squeezed into the respective machining stations IL 11A to 1 on the underside of the press 8.
The second
It is equipped with a transport means 23 of.

In fact, the purpose of these second transport means 23 is to arrange the strip pieces 15.15A in the waiting positions 9.9A, 9B.
, 15B and various machining department ratios 11A to 11
Fragment 15C already located in D.

15D, 15E, 15F, 15G are moved stepwise to the underside of the drawing press 8 from the inlet 17 of this press to the outlet 24.

Thus, during the compression cycle corresponding to the upward and downward movements of the press, these second transport means 23 pick up all of the strip sections 15.15A to 15C and advance these sections by one step 34, so that the first Strip 15G located at outlet 24 of drawing press 8
is discharged from the device 14 in the area of the discharge ramp 33, while
Fragments 15B to 15F are in the machining department 11. 11A
to 11D. These transport means further move the strip fragment 15.15A into its waiting position 9.
, 9A to the next standby positions 9A, 9B, respectively.

(13) (14) From the above description it can be seen that the cycle of the second transport means 23 leaves only one standby position 9 free, and more particularly only the standby position located closest to the cutting device 5. is understood. Therefore, a cycle of operation of the first transport means 16 results in a number of cycles of the second ψ transport means 23 equal to the number of strip pieces 15.15A that are cut and simultaneously conveyed by said first transport means 16.

Finally, this special device of the invention makes it possible to eliminate the feed rate of the drawing press 8 from limiting its production rate.

These second transport means 23 are similar to the first transport means 1 described above.
It can be made into the same shape as the shape of 6.

These transport means therefore move the collective strip pieces 15° 15A to 15G located above the table 22 and below the drawing press 8 according to the first embodiment.
It is formed by at least two arms 25 extending downwardly. These arms 25 are provided on their upper edge 26 with recesses 27.27A to 27C, the number of which is equal to the number of said strip segments 15.15A to 15G, so that these arms move the population of segments one step at a time during one cycle. It allows you to move it.

This cycle includes an upward movement of the arm 25 in order to remove the population fragments 15.15A to 15G from their initial position, this upward movement being followed by a horizontal movement over a length corresponding to one step. These arms 25 then perform a downward movement and strip pieces 15.15A to 15
G at its standby position 9A.

9B or the next machining department 11. 11A or 1
1D or on a discharge slope.

Finally, these arms 25 undergo a second horizontal movement to return to their original positions.

This cycle of the second transport means 23 is controlled by the drawing press 8, so that this upward movement, followed by a one-step movement of the various strip pieces and a downward movement of the arm 25, is controlled by the up-and-down movement of said drawing press 8. It must be noted that it occurs during the phase.

According to another embodiment (15) (16) not shown in these drawings, these second transport means 23 have a number of different strip segments 15.15A in the standby position.

15B and machining department 11. It is formed by clamps (fasteners) equal to the strip segments 15C to 15G located on the underside of 11A to 110.

These clamps advance in this state according to a one-cycle movement, whereby the various strips 15, 15A
to 15G is advanced one step in each compression cycle.

Furthermore, the clamp described above can be replaced by a suction gripper or any other gripping element capable of moving the strip pieces in the condition described above.

In all cases the first transport means 16 and the second transport means 2
3 can be actuated by typical control means 28. Therefore, also according to the embodiment shown in FIG. 6, a camshaft 29,30 is used which is arranged above the cutting device 5 and the table 22. These camshafts 29,30 move the arm 18 of the first transport means 16 and the arm 25 of the second transport means 23 according to the desired speed.
and give cycle motion. A motor 31 ensures the drive of said cam shirt 29.30 via a gear mechanism 32, which can vary its rotational speed. As already mentioned in the above description, the operation of each transport means 16, 23 is carried out on the one hand by a number of compression cycles and on the other hand by the stages of these cycles. The operation of said transport means 16.23 is therefore advantageously controlled by a programmable electronic processing unit. This electronic processing unit uses different motors to drive the camshaft 2.
It should be noted that 9.30 drives can be guaranteed. The operation of these motors is controlled by the programmable processing unit to adjust the motors to the speed of the press and vice versa. Such a structure is actually used for each transport means 16.23
allows individual control of and ultimately better regulation of the device.

In conclusion, even if it is difficult to increase the unwinding speed of strips, i.e. metal type materials, by combining the drawing of several strips into the press (17) (18) according to the invention. , this difficulty can be solved. The drawing press can thus operate at maximum production speed, ultimately resulting in lower production costs.

[Brief explanation of the drawing]

1 is a schematic diagram of an apparatus according to the invention, and FIG. 2 is an apparatus for forming parts by compression from a strip I-IJ strip material, the drawing press and the strip pieces to be formed being removed from the feed area. FIGS. 3 to 5 are views similar to FIG. 2 showing different positions of the components of the device during the compression cycle; FIGS. FIG. 6 is a schematic top view of the control means for actuating the means for transporting strip fragments. 1. IA...Strip, 2.2A...Coil, 5...Cutting device, 6...Buffer storage section, 8...
Drawing press, 9.9A, 9B...standby position, 11
11A-11D...Machining department, 15, 15A-1
5G... strip fragment, 16... first transport means,
17... Entrance, 18... Arm,
19... Upper edge, 20, 20A... Recess, 21.2
1A, 21B... recess, 22... table, 2
3...Second transfer means, 25...Arm, 26
...Top edge, 27, 27A to 27G...Recess, 28
...control means, 29, 30...camshaft,
31...Motor, 32...Gear device, 33
...Discharge slope, 34...1 stage.

Claims (1)

Claims: 1. A method for forming a plurality of parts by compression from pre-cut strip material, the cutting device (5) having several strips (1, 1) from different coils (2, 2A).
A) is supplied with pieces of strip (15, 15A, 15B) whose length corresponds to each part to be machined
, and each of these pre-cut strip pieces (15, 15A, 15B) is placed in a waiting position (9, 9A, 9B).
), forming a buffer store (6), and the pieces (15, 15A, 15B) of these stored strips in the standby position (9, 9A, 9B) are conveyed to each machining machine of the drawing press (8). Department (11, 11A-11D)
They are taken out one by one so that they are carried one after the other to the bottom of the screen. A method of forming a strip material. 2. Apparatus for carrying out the method according to claim 1, comprising one or more cut strip fragments (15
, 15A) from the cutting device (5) to a waiting position (9, 9A) at the inlet (17) of the drawing press (8); , 15A)
to each machining section (11, 11) of the drawing press (8).
A second transport means (23) for removing said fragments one by one for transporting them one by one to the underside of (A to 11D). 3. The first transfer means (16) extends above the cutting device (5) and has a recess (20, at least two arms (20A) having
18), these arms (18) undergo a cyclic movement comprising an upward movement for removing said cut strip pieces (15, 15A), followed by a horizontal movement and a subsequent downward movement. and place these strip fragments (15, 15A) in their waiting positions (9, 9A).
) and these arms (18) then cut the next strip piece (15', 15A') of the cutting device (5).
make a second horizontal movement back to its initial position below the
The table (22) is in front of the cutting device and the drawing press (8)
This table (22) is placed at the entrance (17) of
The standby position of the strip fragments (15, 15A, 15B) (
9, 9A, 9B) corresponding to the recesses (21, 21A, 21
3. Device according to claim 2, characterized in that it has B). 4. A second transport means (23) extends at least two strip pieces (15, 15A to 15G) of the group located below the drawing press (8) on the table (22). formed by arms (25) which, on the one hand, are provided on their upper edge (26) with recesses (27, 27A-27G) whose number is equal to said strip segments (15, 15A-15G); , on the other hand, by a cyclical movement to advance the strip fragments (15, 15A to 15G) over a length corresponding to one step (34), this cyclical movement leading from its initial position to the collection of strip fragments (15, 15G). 15A-15G
), which is followed by a horizontal movement over the length of one step (34) and then placing the strip pieces (15, 15A-15G) in their waiting position (9A, 9B). Or the next machining department (11, 1
1A to 11D) or on the discharge ramp (33), whereby the arm (25)
characterized in that an upward movement and a downward movement followed by only one movement step (34) of each strip segment (15, 15A to 15G) occur between the steps of the up and down movement of said drawing press (8). 4. The device according to claim 3. 5. One operating cycle of the first transfer means (16) comprises:
causing a number of cycles of the second transport means (23) equal to the number of strip pieces (15, 15A) that are cut and simultaneously conveyed by the first transport means (16), and in addition these first transport means (16) and the arms (18, 25) of the second transfer means (23) are each actuated by control means (28) consisting of a camshaft (29, 30), the drive of which is driven by a single motor. (3
1) and by a suitable gear mechanism (32) or by two different motors, the operation of which is regulated to the speed of the press by a programmable electronic processing unit. 4. The device according to 3 or 4.