JPH0124575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates generally to the mechanical fabrication of metals, in particular to
Regarding double roll sheet metal bending machines.

The present invention is most beneficial when used to bend sheet metal into skins. In addition, the present invention may be used in the manufacture of tubular items, parts, aircraft skins, etc.

BACKGROUND OF THE INVENTION Modern machine construction makes extensive use of thin-walled structures and components fabricated by bending sheet materials. Currently, a major trend in mechanical engineering and machine construction is an increase in the so-called single unit power or capacity of machines, which results in larger machines. Machine components also become larger, including those bent from sheet metal by roll-type sheet bending machines. Therefore, one of the problems to be solved with respect to sheet bending machines is increasing the effective length of the rolls.

One of the most promising types of sheet bending machines at present is the double roll sheet metal bending machine, which is characterized by an elastic coating on one of the rolls.

a first roll having a relatively rigid peripheral surface and rotatably mounted on a machine base; having a resilient peripheral layer; comprising a rotary drive and a radial movement mechanism in the direction of the first roll; Double-roll sheet metal bending machines are known (see US Pat. No. 3,478,555), which consist of a second roll with a second roll, the longitudinal axes of which are parallel to each other.

The second roll is essentially a sleeve whose outer surface is finished with an elastic coating and whose shaft or mandrel is supported at both ends and arranged concentrically. Two bearings supporting the sleeve are provided on the shaft of the sleeve between supports at both ends of the shaft, and the bearings are arranged so that the overhang and the span of the sleeve have an equal amount of deflection. The rotary drive applies torque to the sleeve.

When a second roll with an elastic circumferential layer moves radially towards a first roll with a rigid circumferential surface, the elastic circumferential layer of the second roll first touches the rigid circumferential surface of the first roll. When the rolls come into contact with each other and then the rolls come closer together, the elastic surrounding layer becomes deformed. As a result, the roll with a rigid peripheral surface is forced into the elastic covering of the other roll. a second having an elastic surrounding layer;
When the rotary drive of the roll is actuated, the rotation is transmitted by frictional force to the first roll having a rigid peripheral surface. The sheet-like blank is then fed between the rolls and bent around the roll with a rigid peripheral surface by the forces resulting from the deformation of the elastic coating of the second roll.

However, the application of a double roll sheet metal bending machine having the above-described configuration to the production of long, thin-walled items is limited by the stiffness and strength of the roll shafts with elastic surrounding layers.

If an attempt is made to increase rigidity and strength by increasing the diameter of the shaft, the diameter of the roll as a whole will increase. This is disadvantageous for several reasons. First, the overall size of the machine and its material increases. Secondly, increasing the diameter of a roll with an elastic surrounding layer also increases its torque, resulting in a concomitant increase in mechanical drive power. Thirdly, increasing the diameter of the roll by keeping the coating thickness of the elastic surrounding layer at an optimum requires a large amount of rather expensive elastic material, e.g. polyurethane, and the overall mechanical becomes expensive.

Another known double roll sheet metal bending machine is the one shown in Soviet Union Inventor's Certificate No. 634814. This includes a base having a support, a first roll having a relatively rigid surrounding surface and rotatably mounted on the support, and a second roll having an elastic surrounding layer and equipped with a rotation mechanism. It consists of a roll. The second roll has a cylindrical part with a rigid peripheral surface, and an elastic ring is disposed in the cylindrical part, the diameter of the ring is larger than the diameter of the second roll, and its thickness is the same as the thickness of the elastic coating. be. Both rolls are radially movable towards each other in such a way that the second roll is radially movable towards the first roll. The second role is essentially
It is a cylindrical rod with a rigid peripheral surface with an elastic coating. The rod is supported at both ends by bearings mounted on columns.

However, this configuration of known double-roll sheet metal bending machines does not allow the production of long thin-walled items because the stiffness of the rolls with elastic surrounding layers is too low. The bending process of thin-walled items involves high loads per unit length on the bending machine, whereas the second roll may be represented as a single support beam that is subjected to high bending moments about the longitudinal axis. Such bending moments cause considerable deflection of the elastically coated second roll.

The amount of deflection that occurs in the elastically coated second roll can be reduced by increasing its diameter. However, this increases the overall size and mass of the sheet bending machine as a whole, and increases the torque applied to the rolls, which concomitantly increases the power of the second roll rotation mechanism. Increasing the diameter of the second roll while maintaining an optimum elastic coating thickness requires a large amount of coating material, e.g. polyurethane, and the high cost of polyurethane makes it difficult to machine. This results in high prices.

PROBLEM TO BE SOLVED BY THE INVENTION The main object of the invention is to provide a double roll characterized in that the roll with an elastic surrounding layer is arranged in construction to give a high stiffness and a reduced diameter. The objective is to provide a sheet metal bending machine whose features make it suitable for the production of long, thin-walled products.

Means for Solving the Problems The aforementioned objectives of the invention are achieved by the following facts. The fact is that a first roll with a relatively rigid periphery is rotatably mounted on a column connected to a platform, while a second roll with a surrounding layer made of elastic material is made of elastic material. A cylindrical portion having a rigid peripheral surface without a surrounding layer is provided, and an elastic ring is disposed on the cylindrical portion, the diameter of the ring being larger than the diameter of the second roll, and the diameter of the ring being larger than the diameter of the second roll. Double roll sheet metal bending, the thickness of which is equal to the thickness of the surrounding layer of elastic material of the second roll, and which is provided with a rotation transmission mechanism to the second roll, both rolls being movable in the radial direction with respect to each other. In the machine, according to the invention, the diameter of the cylindrical part with the above-mentioned rigid peripheral surface is substantially smaller than the diameter of the outer surface of the second roll, and
In the gap provided between the inner surface of the elastic ring and the outer surface of the cylindrical part having a rigid peripheral surface provided on the second roll, the above-mentioned The fact is that the supporting part is housed in contact with a cylindrical part with a rigid peripheral surface.

This constructional arrangement of the double roll sheet metal bending machine of the invention allows the production of long, thin-walled products by increasing the stiffness of the rolls with an elastic surrounding layer. Since the outer surface of the second roll with a surrounding layer of elastic material has a cylindrical section supported by struts connected to the platform, the second roll is represented as a multi-supported beam with uniformly distributed loads. Under the same load, the bending moment will be lower and the deflection experienced will also be lower.

This structural arrangement of the second roll allows for a smaller diameter and also saves on expensive elastic coating materials.

By providing an elastic ring on each of the parts with a rigid peripheral surface of the second roll having an elastic peripheral layer, the elastic coating of the second roll is effective over the entire parent surface. A second like this
The configuration of the rolls allows the roll length to be increased to a limit that depends on the minimum roll stiffness, and the minimum roll torsional strength places a limit on the roll length.

For example, existing double roll bending machines have a roll effective length limit of 2000mm. For such a length of roll with an elastic peripheral layer, the maximum diameter is 400 mm. For existing roll configurations, doubling the roll effective length increases the experienced bending moment by a factor of 4 and the roll diameter by a factor of 1.58, proportionally increasing the diameter of the roll with an elastic surrounding layer.

The double roll sheet metal bending machine of the invention uses a 400 mm roll of rolls with an elastic surrounding layer.
For a similar diameter of , it is possible to enlarge the roll effective length to 4000 mm. In other words, in existing double roll sheet metal bending machines,
When applying a load of 200 KN per meter of length of the roll, the diameter of the roll with a surrounding layer of elastic material of length 4000 mm must be, for example, more than 600 mm, but according to the invention this diameter can be reduced to 400 mm. It is possible to decrease.

In the double roll sheet metal bending machine of the present invention, the support consists of two anti-friction bearings mounted on a bracket, which is fixed to the stand and has an elastic ring passage opening, which supports the longitudinal axes of both rolls. Advantageously, the size of the cross-section of the opening in the plane through which it passes is greater than the size of the cross-section of the elastic ring in that plane.

If the support part is provided as two anti-friction bearings, the second
The frictional forces acting between the cylindrical part with a rigid peripheral surface of the roll and the support part are reduced, making it possible to reduce the amount of torque required for the elastically coated roll. This reduces power and reduces the overall size of the second roll rotation mechanism, resulting in energy savings.

In order to increase the stiffness of the second roll with an elastic surrounding layer, it is necessary to securely connect the bracket supporting the anti-friction bearing to the platform.By providing an opening in the bracket supporting the anti-friction bearing, the elastic ring can be It is possible to arrange two rolls in a cylindrical part with a rigid peripheral surface, and the second roll can also be used to transmit the rotation to the cylindrical part, thereby spreading the elastic coating of the roll to the entire roll. It can be placed into operation along the base surface.

Embodiments Other objects and advantageous features of the invention will become apparent below from the detailed description of exemplary embodiments of the invention.

The double roll sheet metal bending machine of the invention, applied for example to the bending of skin panels, comprises a base 1 (FIG. 1) with supports 2, 3 and two rolls, namely a first roll with a relatively rigid peripheral surface. It consists of a roll 4 and a second roll 5 having a surrounding layer made of elastic material and equipped with a mechanism for rotating the roll about a longitudinal axis. The longitudinal axes of the first roll 4 and the second roll 5 are parallel to each other. The first roll 4 is the support 2,
It is rotatably mounted on 3. The first roll 4 is supported on roller bearings 8 at the journal 7, while the journal 9 of the roll is supported on two roller bearings 10. Half of the circumference of the bearing 8 is a support part 11
The support is vertically movable along a guideway (FIG. 2) provided in the column 2. The support 11 has an opening 13, which is convenient for attaching the support 11 to the rod 15 of the hydraulic cylinder 16 by means of a nut 14. The hydraulic cylinder has a support part 11
It is suitable for activating the vertical movement of and is fixed to the column 2. Slot 1 provided in post 2
7 is for accommodating the hydraulic cylinder 16, and the opening 18 is for removing the completed skin.

The bearing 10 (FIG. 1) is pushed into a support 20, which supports a guideway 2 provided in the column 3.
1 in the vertical direction.

The support 20 has an opening 22 which is convenient for attaching the support 20 to the rod 24 of the hydraulic cylinder 25 by means of a nut 23. The hydraulic cylinder is suitable for actuating the vertical movement of the support 20 and is fixed to the column 3. The roll 4 is movable in the radial direction towards the second roll 5.

The second roll 5 essentially consists of a sleeve 27
(FIG. 3) having a core 26 (FIG. 2),
Each sleeve is connected to the core 26 via a key 28 and has a surrounding layer of elastic material 29. Second
The roll 5 has a rigid peripheral surface, e.g.
The sleeve 30 has two cylindrical parts, each of which is provided with flanges, between which an elastic ring 31 made of polyurethane, for example, is inserted. The diameter of the ring 31 is larger than the diameter of the second roll 5, while the thickness of the ring is equal to the thickness of the elastic surrounding layer of the second roll. When the elastic ring 31 is provided on the cylindrical portion of the second roll 5 having a rigid peripheral surface, the elastic coating of the second roll 5 becomes effective over the entire mother surface. The diameter of the cylindrical part with the rigid peripheral surface of the second roll 5 is substantially equal to the diameter of the remaining rigid surface of the second roll, i.e. the outer diameter of the sleeve 30 with flanges is equal to that of the sleeve 27. Equal to outer diameter. Washers 32 and nuts 33 are provided to prevent axial displacement of sleeves 27 and 30.

The journal 34 (FIG. 1) of the core 26 is supported by a roller bearing 35 pressed into the support column, while the journal 36 of the core 26 is supported by a roller bearing 37 pressed into the support column 3. The journal 36 is coupled to a shaft (not shown) of a rotating mechanism 6 for the roll 5 via a coupling (not shown), and the rotating mechanism is actually a hydraulic motor.

A gap 38 (FIG. 3) provided between the inner surface of the elastic ring 31 and the outer rigid surface of the second roll, i.e. the outer surface of the sleeve 30, is connected to the rigid surface of the second roll, i.e. , accommodates a support portion 39 that contacts the surface of the sleeve 30. Support part 3
9 consists of two antifriction bearings 40, each bearing being held in a bracket 42 via a stud 41 (FIG. 3), while the bracket 42 is fixed to the base 1. The bracket 42 is an elastic ring 31
It has an opening 43 for passage therethrough, and the cross-sectional size of the opening 43 in a plane passing through the longitudinal axes of the rolls 4 and 5 is larger than the cross-sectional size of the elastic ring 31 in the plane.

Function The function of the double roll sheet metal bending machine of the present invention is as described below.

When pressure is applied to one of the chambers of the hydraulic cylinder 25 (FIG. 1), the rod 24 causes the support 20 to move vertically along the guide path 21 together with the roll 4. When pressure is applied to one of the chambers of the hydraulic cylinder 16, the rod 15 causes the support 11 to move vertically until its cylindrical surface contacts the surface of the bearing 8. Subsequently, the hydraulic cylinders 16, 25 drive the roll 4 in radial movement towards the roll 5, so that the roll 4 with a relatively rigid peripheral surface has a peripheral layer of elastic material. It is pushed into the second roll by a specified depth. The deformation of the elastic covering generates a return (repulsion) pressure, which is supplied to the bearing 35 , the three supports 39 and the bearing 37 . In this way, the second roll 5 can be represented as a multi-support beam with a uniformly distributed load, with the effect of reducing the bending moment, ie the deflection.

The rotation of the shaft of the hydraulic motor 6 is transmitted to the second roll 5 which has an elastic coating. As the roll 5 rotates, the elastic ring 31 (FIG. 2) and the roll 4 also rotate due to frictional force. The sheet-like blank is then fed between rotating rolls 4 and 5 to be formed into an outer panel 19. The blank is then bent around roll 4 until it leaves the contact area of rolls 4 and 5. So immediately the water pressure was 6
is stopped, thereby stopping the operation of roll 5 and thus roll 4. Then the hydraulic cylinder 16
The support part 11 moves upward and opens the opening 18.
(FIG. 2), while the hydraulic cylinder 25 actuates the support 20 and moves upwards with the roll 4 until the contact between the roll 4 and the elastic circumference of the roll 5 is broken. Finally completed exterior panel 1
9 is collected through opening 18.

A feature of the double roll sheet metal bending machine described above is that the second roll with an elastic surrounding layer is constructed in such a way that the roll length can be increased with a relatively small diameter; It is limited by the rigidity limit and by the torsional strength of the roll. By reducing the diameter of the second roll, expensive elastic coating material can be saved.

Effects of the Invention The double roll sheet metal bending machine provided by the present invention can be successfully applied to the production of tubular components made of high strength aluminum alloys, titanium alloys for anti-icing and life support systems of airplanes. When bending long, thin-walled items up to 1.5 mm thick in the case of titanium alloys and up to 3.0 mm thick in the case of aluminum alloys, the loads on the second roll with an elastic periphery reach 200 kN/m. A roll with an elastic circumference under such a force will have a diameter
The length is 400mm and the length is 4000mm.

The double roll sheet metal bending machine is miniaturized by a second roll with the aforementioned diameter and an elastic surrounding layer, and the material, e.g. polyurethane for the elastic surrounding layer, and the rotational drive of the second roll Electrical power can be saved.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of the double roll sheet metal bending machine of the present invention, with the non-white portion showing partially cut away supports for the first and second rolls. Figure 2 is an enlarged sectional view taken along the line - in Figure 1, and Figure 3 is an enlarged sectional view of the line 2 in Figure 1.
FIG. 3 is a cross-sectional view taken along line - in the figure. The following is a list of reference numerals used in the description and claims of the invention. 1: stand, 2: support, 3: support, 4: first roll, 5: second roll, 6: second roll rotation mechanism,
7: First roll journal, 8: Roller bearing,
9: First roll journal, 10: Two roller bearings, 11: Support part, 12: Two guide paths, 1
3: Opening of support part 11, 14: Nut, 15: Rod, 16: Hydraulic cylinder, 17: Slot of strut 2, 18: Opening of strut 2, 19: Outer plate, 20:
Support part, 21: Two guide paths, 22: Support part 20
opening, 23: nut, 24: rod, 25: hydraulic cylinder, 26: core, 27: sleeve, 2
8: Key, 29: Elastic material, 30: Sleeve with flange, 31: Elastic ring, 32: Two washers, 33: Two nuts, 34: Core journal, 35: Roller bearing, 36: Core journal, 37 : Roller bearing, 38: Gap, 39: Support part, 40: Two anti-friction bearings, 41: Stud, 4
2: Bracket, 43: Opening.

[Claims]

1. A mold guide supporting one side of the mold is provided on one side of the mold base plate, and a mold fixing claw supporting the other side of the mold can be raised and lowered at an opening on the other side of the base plate. An operating cam for driving the mold fixing claw is provided movably within the mold base plate, and is wedged with the tapered surface of the mold fixing claw in an upright state with respect to the operating cam. 1. A device for attaching and fixing a mold, comprising: a tapered surface that holds the wedge; and a pressing tool that urges the operating cam in a direction that holds the wedge.

Claims (1)

A double roll characterized in that a support part 39 is housed in contact with a cylindrical part having an surrounding surface.
Sheet metal bending machine. 2 The support 39 essentially consists of two anti-friction bearings 40 mounted on a bracket 42, which is fixed to the base 1 and fitted with an elastic ring 3.
1, and the cross-sectional size of the opening in a plane passing through the longitudinal axes of the rolls 4, 5 is larger than the cross-sectional size of the elastic ring 31 in the plane. Claim 1
Double roll sheet metal bending machine as described in section.