CN102658450A - Unfolding and machining method for single-bent thin-walled parts - Google Patents

Abstract

The invention relates to an unfolding and machining method for single-bent thin-walled parts, which is applicable to thin-walled parts with a curvature radius of more than 1000 mm. The method is characterized by comprising the following steps of: 1) carrying out pre-roll bending on thin-walled parts, wherein the rolled radius of each thin-walled part is 1000 mm larger than the final curvature radius thereof; 2) carrying out unfolding and machining on the thin-walled parts, namely, unfolding the thin-walled parts on a vacuum platform of a numerical control device to be clamped, keeping the machined surfaces of the thin-walled parts horizontal, and machining the thin-walled parts through selecting a high-speed milling numerical control machining mode, wherein the machining path is a longitudinal serpentine milling path; and 3) discharging the parts from the vacuum platform, and placing the parts in a natural state, so that the final technical requirement can be satisfied. The method is not only simple, but also can save a lot of production cost on the premise of ensuring the quality and machining cycle of the parts.

Description

The expansion machine adding method of single thin-wall part

Technical field

The present invention relates to a kind of expansion machine adding method of single thin-wall part, belong to the panel beating forming field.

Background technology

Existing traditional processing proposal to the single thin-walled parts is divided into dual mode.A kind of mode is a milling part thickness and sink after the panel beating moulding, mills the folder machine on then and adds interior profile.This processing scheme of the thin-walled parts of overwhelming majority employing at present.The characteristics of this scheme are, the process-cycle is longer, and quality is more stable, and processing cost is higher.Its shortcoming is: be to guarantee part quality, the sagging number of plies of part milling can not be more than 5 times, otherwise the part wall thickness tolerance can't guarantee, the milling case puts that control is not very accurate with size, and error is about about 1mm, and machine adds the large-scale machined dress of needs special use etc.Another kind of mode is that machine adds sagging and profile under the dull and stereotyped state of thin-walled single part, finishes back panel beating factory at downset areas shimming rolling-bending forming.The characteristics of this scheme are, the process-cycle is short, and quality is unstable, and processing cost is low.But a necessary condition of this scheme is that the thin-walled parts embossed shape is necessary for bigger and simple, the single thin-walled parts of depth conversion that sink, and the product design demand that this necessary condition significant discomfort is used for becoming increasingly complex at present.

Summary of the invention

The technical problem that the present invention will solve provides a kind of expansion machine adding method of single thin-wall part, and this method not only method is simple, and can under the prerequisite that has guaranteed part quality and process-cycle, practice thrift a large amount of manufacturing expenses.

For overcoming the above problems, concrete technical scheme of the present invention is following: a kind of expansion machine adding method of single thin-wall part is applicable to that radius of curvature greater than the thin-wall part more than the 1000mm, may further comprise the steps:

1) thin-walled parts rolls curved in advance: with the big 1000mm of the final radius of curvature of the radius ratio of thin-wall part rolling;

2) thin-walled parts expansion machine is added: thin-walled parts is deployed in clamping on the vacuum platform of numerical control device, keeps thin-wall part finished surface level, select the High Speed Milling Operation digital control processing for use, machining locus is vertical snakelike milling;

3) part is unloaded from the vacuum platform, nature is placed, and can reach final specification requirement.

The expansion machine adding method of this single thin-wall part adopts above-mentioned steps, through rolling earlier curved part in advance, flattens then and again part is carried out machine and add, and through snakelike milling longitudinally, makes part produce bigger bending stress, thereby reaches specification requirement.This method not only quality to guaranteeing, and saved a large amount of processing steps, practiced thrift a large amount of costs.

Description of drawings

Fig. 1 rolls curved sketch map in advance for the single thin-wall part.

Fig. 2 adds sketch map for single thin-wall part expansion machine.

Fig. 3 is the final delivery status figure of single thin-wall part.

1-cutter path wherein; The 2-cutter.

The specific embodiment

As shown in Figure 1, contour dimension is aluminium lithium alloy 2198 thin plates of 3200mm * 2100mm * 3.175mm, need the processing parts size after, radius of curvature requires to become 1667.5mm, the expansion machine adding method to this single thin-wall part may further comprise the steps:

1) thin-walled parts rolls curved in advance: with the big 1000mm of the final radius of curvature 1667.5mm of the radius ratio of thin-wall part rolling, rolling curved radius in advance is 2500mm ~ 2600mm;

2) prove through lot of test that thin-walled parts rolls under the curved situation of radius greater than R1000mm in advance, when thin-walled parts launched clamping, suffered power did not influence the final weight of thin-walled parts, so thin-walled parts expansion machine is added; Thin-walled parts is deployed in clamping on the vacuum platform of numerical control device; Keep thin-wall part finished surface level, select the High Speed Milling Operation digital control processing for use, machining locus is vertical snakelike milling; Snakelike cutting purpose be control as far as possible cutting stress from the big place of clamping stress to the little local transition of clamping stress; Mild to reach control thin-walled parts internal stress, increase influence to distortion, and the negative effect of avoiding local excessive stresses that part is produced; As shown in Figure 2, and then thin-walled parts local depression or hole handled;

3) part is unloaded from the vacuum platform, nature is placed, and the curvature of thin-walled parts is between 1670mm ~ 1800mm; Be 15mm to the maximum with the gap of assembling jig, using dynamometer to detect maximum erection stress is 15.8 pounds, can satisfy matching requirements; Meet specification requirement, as shown in Figure 3.

Claims (1)

1. the expansion machine adding method of a single thin-wall part is applicable to that radius of curvature greater than the thin-wall part more than the 1000mm, is characterized in that may further comprise the steps:

1) thin-walled parts rolls curved in advance: with the big 1000mm of the final radius of curvature of the radius ratio of thin-wall part rolling;

2) thin-walled parts expansion machine is added: thin-walled parts is deployed in clamping on the vacuum platform of numerical control device, keeps thin-wall part finished surface level, select the High Speed Milling Operation digital control processing for use, machining locus is vertical snakelike milling;

3) part is unloaded from the vacuum platform, nature is placed, and can reach final specification requirement.

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