Method of making curved parts from section rolled stock

FIELD: process engineering.

SUBSTANCE: invention relates to ship building, particularly, to making the parts of ship hull. Part involute is obtained using robot cutting NC machine for marking notches on edge and wall and cutting curved end on edge and wall along Archimedes spiral. Bending is performed in two steps. At first step, local rotary bending press is used for bending curvilinear ends for the length of 800-1000 mm with control over part bent ends along rectifiable lines. At second step, bending is performed by known method with control over bent part shape along rectifiable lines and final cutting of notches.

EFFECT: better quality of finished parts, lower labor input.

 

The present invention relate to the field of different processes, namely shipbuilding, fabrication-related parts of the hull of a ship.

Currently, the curved parts of the ship set of profiled products are manufactured by way of cold bending straight blanks and subsequent newspaper clippings using gas cutting parts necessary forms.

Similar to the proposed method is a method developed Veselkova CENTURIES in "Using graphical information for job sizes and to control the shape of the curved edge profile details". Shipbuilding technology, No. 1, 1978

This method uses regular rectifiable lines, which are now calculated in all CAD/CAM systems. However, since they serve only to control the shape of the overall bending of the workpiece and does not define the shape of the edges of all, their use does not allow to completely abandon the need to use bending templates. As a result the accuracy of the determination of the form of regular rectifiable lines low.

The prototype of the proposed method is "a method of manufacturing a bent shape of the car" AS the USSR №603180, bull. No. 18, 1979

In this method, first, in accordance with drawing data Cabinet design is determined by the sweep length (straight stripes) is etale. The calculation of the length of the scan can be performed using specialized modules of computer CAD/CAM systems or by measurement of bending template. Then to the resulting length of the scan-side bent (curved) ends added bending allowances.

In accordance with the length of the workpiece from a profile strip is cut straight billet, which is then subjected to bending at the bending equipment. The control of the shape of the bent workpiece in the bending process is performed using a bending templates that are made within the lofting and technology training to every detail. After bending the workpiece using the bending template is the layout on the bent workpiece shape of a part. While in the process of marking mark the shape of the trim all the details and all the cutouts on the edge of the part, and in the detail field. Then spaced from the bent workpiece using manual gas cutting equipment (gas cutter) cut the actual item (trim ends and cut all cuts). The cut out detail is subjected to the second control by using the bending template and, if necessary (if the item is lost shape due to thermal deformation in the process of cutting), is finishing the folded part to the requirements of Tolerancing, regulated by such the tion tolerances. Lapping is performed by the method of heat straightening with cutting equipment.

The main disadvantage of this method is the necessity of bending templates for each item, the need to increase the length of the workpiece on the values of the bending allowances, after which flexible trimmed to the mixture (waste), and the inability to use equipment with numerical control (CNC) machines to cut all of the details.

Object of the invention is the improvement of the technological process at the expense of abandoning the use of bending templates, improve the quality of finished parts and reducing the complexity of their production.

This object is achieved in that a method of manufacturing bent parts with cuts from rental includes receiving scan items using the robotic cutter with CNC for marking cut-pas edge and the wall and cut the curved ends on the edge and the wall on the line in the form of an Archimedean spiral, its bending in two stages, the first of which use the press for rotary-local flexible method of rolling bends curved ends of the length from 800-1000 mm, control of the shape of the bent ends of the details on regular rectifiable lines, in the second stage bending perform on existing technology to control the shape of the bent parts on regular rectifiable lines and final cut were the s.

Now to cut the straight parts of the profile used car robot-Carver CNC. In the domestic shipbuilding robot cutter is used at JSC "Baltic shipyard". Bent workpiece with a robot-cutter process impossible.

The last (manual trim ends) defines the low accuracy of the shape of all parts of the ship set (especially in terms of cutting head profile of the workpiece), which further adversely affects the quality of collected hull structures.

As the equipment for cutting and marking profile of the workpiece is proposed to use a robotic cutter German company IMG. Experience of its use today has at JSC "Baltic shipyard". However, at present it is used only for cutting and marking straight parts of the ship set. In the proposed method, the robot will be cut and mark a straight scan curvilinear component. Be cut will be the ends of the parts and laid out the cut on the edge and the wall (cut them to not flexible in accordance with the technology). The shape of the line trim in the composition of the UE will be given not in the form of a straight line (as is done in the method used), and in the form of an Archimedean spiral. Geometrical parameters of the spiral of Archimedes for each straight edge profile with high quality, the second wall H and Malka M is defined by three points on the basis of what's the point of bleed on the tension side of the strip must be deflected from a straight line by the value of19HMRNSL(where R - bending radius of the neutral layer) in the direction opposite to the tension, and the point on the compressed layer by the value of49HMRNSLin the direction opposite to the compression, while the position of a point on the neutral layer remains unchanged.

Currently, regular rectifiable line (in foreign shipbuilding they are called inverse lines) are calculated for all CAD/CAM systems. However, since they serve only to control the shape of the overall bending of the workpiece and does not define the shape of the edges of all, their use does not allow to completely abandon the necessity of applying bending templates. As a result the accuracy of the determination of the form of regular rectifiable lines low.

In the proposed method, the shape of the edges of the ends is formed in the process of cutting robot cutter, so the quality of the job bending shape with regular rectifiable lines more responsible. The use of robot-cutter together with regular rectifiable lines poses which enables you to refuse the use of bending templates in General, but it is necessary to increase the reliability of the method of control through regular rectifiable lines. To achieve this goal, the authors, in comparison with analogues and variants of calculation in the foreign systems, provides a new theoretical basis of the distance between thermoprocessing points to calculate regular rectifiable lines and the magnitude of perekroi. So the distance between thermoprocessing points are encouraged to take no more than 100 mm, and the magnitude of perekroi to take at least half short regular rectifiable line. Data theoretical positions do control the shape of the bent workpiece using regular rectifiable lines is not less accurate than using a bending template.

In order to achieve bending of the workpiece without allowances, it is proposed to do it in two stages. This approach has not previously been used. At the first stage by using a press for rotary-local flexible method of rolling is Podlipki curved ends in the volume of 800-1000 mm. The control of the shape of the bent ends of the parts is straightening regular rectifiable lines.

The second stage is flexible for any existing technology (horizontal press, roller press, vertical press) with control over the shape of the bent parts on regular rectifiable lines.

The final process of cutting notches in the edge and in the detail field is carried out using a Roux is Noah gas cutting. If after opening cut item will lose shape due to thermal deformation, edit it, just like in case of traditional technologies, will be performed using gas burners.

Technical and economic efficiency.

The proposed method for the manufacture of molded parts from specialized Bicycle allows you to completely abandon the use of the bending template (reducing labor and materials), to refuse the appointment of bending allowances (reduction of metal consumption, saving material may lie in the range from 600 to 1600 mm on each manufactured item), use CNC equipment to cut the ends of the parts (improving the accuracy of finished parts, reducing the complexity).

A method of manufacturing bent parts cut out of the car, including the receipt scan items using the robotic cutter with CNC machine for marking a cut on the edge and the wall and cut the curved ends on the edge and the wall on the line in the form of an Archimedean spiral, its bending in two stages, the first of which use the press for rotary-local flexible method of rolling bends curved ends of the length from 800-1000 mm, control of the shape of the bent ends of the details on regular rectifiable lines, in the second stage, the bending is performed by control of the shape of the bent parts on regular rectifiable lines and final in the cut cut.



 

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EFFECT: raised quality of bending.

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