Method of making curved parts of the rod

 

The invention relates to the processing of metals by pressure and can be used in the production of parts made from a bar type terminal rail mounting. The method is carried out in a mould by first flexible on the mandrel end sections of the workpiece, releasing them from contact with the mandrel and subsequent flexible the rest of the workpiece, with the initial bending lead to the formation of two loops running on the rod by a pair of rollers moving along a curved path, then fix the blank and bend two sites distant to the center of the workpiece from the previously bent in the same direction until the formation of the third loop. Productivity increases. 7 C.p. f-crystals, 11 ill.

The invention relates to the processing of metals by pressure and is intended for use in the metallurgical industry for the production of rod-type terminals rail fasteners, connecting straps and loops.

A known method of manufacturing a curved parts of the rod /1/ implemented stamp by initial and subsequent flexible workpiece. These characteristics coincide with the essential features of the claimed invention.

The disadvantage of this spacescape. On the first transition is only one bend in the workpiece, and the second transition - dogive one end of the workpiece at an angle to the plane of the first bend and forming the other end of the workpiece, which enables to produce only simple details narrow range.

A known method of manufacturing a curved parts of the rod /2/ with three loops implemented in the stamp by first flexible on the mandrel end sections of the workpiece, releasing them from contact with the mandrel and subsequent flexible the rest of the workpiece. These characteristics coincide with the essential features of the claimed invention. Subsequent bending the middle part of the workpiece lead into the direction opposite the initial bend.

The disadvantage of this method is the inability to receive one stamp of parts with loops on the ends of the workpiece and the big loop in the middle part. In addition, the dimensional cutting of the workpiece outside of the bending of the stamp on a separate press requires the use of special transmitting devices, synchronized with the operation of the stamp.

The closest in technical essence to the claimed is a method of making curved parts of the rod /3/ having three loops implemented in W is akami and subsequent flexible the rest of the workpiece. These characteristics coincide with the essential features of the claimed invention. Subsequent bending the middle part of the workpiece lead into the direction opposite the initial bend.

The disadvantage of this method is the inability to receive one stamp of parts with loops on the ends of the workpiece and the big loop in the middle part, due to inappropriate schemes implementation of technological transitions flexible.

For analogs and prototypes common cause, preventing the manufacture of parts having loops at the ends of the workpiece and the big loop in the middle part, is unacceptable execution scheme of technological transitions.

The basis of the invention is the task in the method of manufacturing the curved parts of the rod by means of rational operations flexible to provide the possibility of making one stamp with high performance parts that have loops on the ends of the workpiece and the big loop in the middle.

To solve this problem a method of manufacturing a curved parts of the rod, with three loops, carried out in the stamp by first flexible on the mandrel end sections of the workpiece, releasing them from contact with the mandrel and subsequent flexible the rest of the duck by a pair of rollers, moving on curved trajectories, then fix the blank and bend two sites distant to the center of the workpiece from the previously bent in the same direction until the formation of the third loop. The initial bending of the workpiece are running on the rod by a pair of rollers moving in circles with centers located inside two loops at more than a right angle 180. Branches of the third loop is formed subsequent flexible workpiece by another pair of rollers at an angle greater 90. The workpiece is fixed by holding the first pair of rollers for two loops. The ends of the workpiece bend angle to the rest of the workpiece by moving the pair of rollers along their longitudinal axis during the initial bending. Before the initial flexible stamp to produce the cutting of the workpiece length. The workpiece, which has three loops, transfer to another position of the stamp, where you bend it in the other plane. In one stamp produce simultaneous cutting and then bending the two workpieces, which are set in the stamp towards each other.

The above characteristics of the claimed invention provide a technical result, which is manufacturing on the same stamp with the issuance of each turn prevena the relationship between the set of essential features of the claimed invention and achievable technical result consists in the following.

Original flexible workpiece to form the two loops running on the rod by a pair of rollers moving along a curved trajectory, allows you to sync bending end sections of the workpiece and to obtain a symmetrical loop.

Workholding and flexible of the two sites distant to the center of the workpiece from the previously bent in the same direction until the formation of the third loop allows you to precisely center the workpiece without touching it with his hands, and fully implement the shaping parts per stroke of the stamp.

Original flexible workpiece by rolling the rod by a pair of rollers moving in circles with centers located inside two loops at more than a right angle 180gives the ability to withstand a given configuration of the loops and to compensate for the elastic springback of the curved sections of the workpiece.

The education branch of the third subsequent loops of the flexible workpiece by another pair of rollers at an angle greater 90allows to minimize friction bending tool on the workpiece and to compensate for the elastic springback of the average loop detail after removal efforts flexible.

Workholding holding the first pair of rollers for two loops f of the workpiece.

The bending of the end sections of the workpiece at an angle to the rest of the workpiece by moving the pair of rollers along the longitudinal axis during the initial bending allows you to produce details of spatial forms in one move, stamp, combining bending hinges are flexible in a plane at an angle to the plane of the placement of the rest of the blanks.

Cutting billet gauge length before the initial flexible stamp allows you to automate the process of making parts on one press and improve performance.

The transfer of the workpiece, with three loops, in another position of the stamp, where it bends in different plane, gives the opportunity to expand the technological capabilities of manufacturing in one stamp details of spatial forms.

Simultaneous cutting and then two flexible workpieces, which are set in the stamp towards each other, allows to produce two items in one turn of the stamp and at the same time to avoid unbalanced load of the machine when cutting the workpiece, taking into account that the effort of logging in several times more effort flexible.

The invention is illustrated by drawings which depict:

in Fig.1 - location of the parts bending tool before flexible parts;

in Fig.4 - scheme of large flexible loop part;

in Fig.5 is a wiring diagram of bending and auxiliary rollers with the sleeve covering the mandrel;

in Fig.6 is an example of the manufactured three-loop parts with integral sections, arranged at an angle to the rest of the workpiece;

in Fig.7 is an example of the manufactured three-loop details, curved in a different plane;

in Fig.8 is a top view of details of Fig.6 and 7;

in Fig.9 is a diagram of two flexible hinge parts shown in Fig.6;

in Fig.10 is a diagram of the flexible parts shown in Fig.7;

in Fig.11 is a diagram of the fabrication of two parts.

Making curved parts of the rod, with three loops, two 1 small and one large 2, is carried out in a mould by first flexible on the mandrel 4 end sections 3 of the workpiece to form the two loops 1. The initial bending are running on the rod with a pair of bending rollers 5, moving along a curved path 6. Choice of curved trajectories can be circles with centers located inside the two loops. To compensate for the springback of the curved ends of the loops 1 to withstand paralleli their end sections 3, the rollers 5 rotate by an angle greater 180and compensate so springback loop 2 after removal of the load flexible. After unloading branches of the loops 1 remain parallel.

In the manufacture of curved parts with three hinges, in which the end sections 3 are tilted to the rest of the blank, the ends 3 bend angleto the rest of the workpiece by moving the pairs of rollers 5 along their longitudinal axis simultaneously tested during the initial bending. The axial displacement of the rollers 5 is when you push the AC is the same as when bending a flat details.

In the manufacture of curved parts with three loops, which loops are not in the same plane, and have a spatial form, a curved flat preparation transfer to another position of the stamp, where you bend it in the other plane of the punch 22 in the matrix 23.

In the same stamp make cutting the workpiece length for flexible parts of the rod, which is defined between the mandrel 4 and 14 and the rollers 5 through the cylindrical sleeve 24 until the stop 25. Cutting is carried out by the knife 26, which is mounted on thebattle 27, interacting with the rod at the initial time flexible. The other end of the rod is bent symmetrically located atributele 28, made without a knife. Subsequent bending operations are the same as described above with reference to task in the stamp unit-length process.

In one stamp you can produce simultaneous cutting and then bending the two workpieces 29 and 30, which are set in the stamp towards each other. In this case, the cylindrical sleeve 24 are located at the edges of the stamp, and the stop 25 has two working sides 31 and 32.

Example. The original rod with a diameter of 17 mm set in a bending press with a force of 1000 kN for the manufacture of a spring clamp for rail fastening with three loops. is it the ends to form the two loops. Then in the same direction bends the third big loop details. The preform is transferred to the second position of the stamp, where bends in different plane. All bending operations are performed in one stroke of the press.

Sources of information

1. Auth. mon. The USSR №649488, CL 21 D 35/00. Bulletin of inventions No. 8, 1979.

2. Patent USSR No. 1817723, CL 21 D 35/00, 22/02. Bulletin of inventions No. 19, 1993.

3. Patent of Russia №2157291, CL 21 D 53/36, 7/06, 35/00. Bull. No. 28, 2000.

Claims

1. Method of making curved parts of the rod, with three loops implemented in the stamp by first flexible on the mandrel end sections of the workpiece, releasing them from contact with the mandrel and subsequent flexible the rest of the workpiece, characterized in that the initial bending lead to the formation of two loops running on the rod by a pair of rollers moving along a curved path, then fix the blank and bend two sites distant to the center of the workpiece from the previously bent in the same direction until the formation of the third loop.

2. The method according to p. 1, characterized in that the initial bending of the workpiece are running on the rod by a pair of rollers moving in circles with centers located in retia loops form a subsequent flexible workpiece by another pair of rollers at an angle more 90.

4. The method according to p. 1, characterized in that the workpiece is fixed by holding the first pair of rollers for two loops.

5. The method according to p. 1, characterized in that the ends of the workpiece bend angle to the rest of the workpiece by moving the pair of rollers along their longitudinal axis simultaneously tested during the initial bending.

6. The method according to p. 1, characterized in that before the initial flexible stamp to produce the cutting of the workpiece length.

7. The method according to p. 1, characterized in that the workpiece, which has three loops, transfer to another position of the stamp, where you bend it in another plane.

8. The method according to p. 1, characterized in that one stamp produce simultaneous cutting and then bending the two workpieces, which are set in the stamp towards each other.

 

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