A hydraulic fixture based on progressive forming machine tool and its feeding method for sheet metal forming

Abstract

The invention discloses a hydraulic fixture based on a progressive forming machine tool. The hydraulic fixture based on the progressive forming machine toolis characterized by including a support table, an upper support plate, a lower support plate, an upper pressing plate, a lower pressing plate, a hydraulic device, guide pillars and guide sleeves, wherein the lower ends and the upper ends of thefour guide pillars are cold-pressed into the support table and the upper support plate correspondingly, the lower support plate is arranged between the support table and the upper support plate, andthe lower support plate is assembled through the guide pillars and the guide sleeves; the upper pressing plate and the lower pressing plate are correspondingly installed on a lower frame of the uppersupport plate and an upper frame of the lower support plate; the hydraulic device is arranged between the lower support plate and the support table, and two ends of the hydraulic device are correspondingly connected with the support table and the lower support plate through fasteners. The edge-pressing force of the four sides of each pressing plate is independent of each other so that the pressingplates of the hydraulic fixture based on the progressive forming machine tool can be simultaneously controlled and also can be correspondingly controlled and the edge-pressing force can be changed over time in the machining process; by reducing the edge-pressing force of the pressing plates, the fluidity of the plate material is strengthened, the plate material is convenient to feed in the machining process, the break of the plate material is avoided in the machining process, and the formability performance of the plate material is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of progressive forming of sheet metal, and in particular relates to a hydraulic clamp based on a progressive forming machine tool and a feeding method for sheet metal forming. Background technique [0002] Sheet metal forming is widely used in the manufacturing industry. Traditional processes such as sheet metal stamping are a manufacturing technology with high material utilization and high productivity. However, the production cycle is long and the cost is high, so it is difficult to adapt to small batches of multi-variety production and samples. Trial needs. With the continuous development of the automobile manufacturing industry and aerospace and other fields, more and more stamping parts have the characteristics of more varieties and fewer quantities. These parts are not economical to stamp with conventional dies. Driven by social needs and supported by computer digital manufacturing technology, CNC in...

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Problems solved by technology

[0005] After searching the existing incremental forming technology and devices, it is found that the development of incremental forming has been restricted by the forming limit angle, and it is difficult to process parts with large forming angles, and there is a lack of a way to replenish the sheet metal during processing In addition, at present, the fixtures of progressive forming machine tools are still in the state of manually clamping the sheet. Every time the parts are processed, the sheet needs to be manually clamped. When the upper and lower platens are replaced, the tool needs to be re-set. The blank-holding force of the traditional fixture is completely provided by the locking force of the hexagon socket head screws at the four corners of the press plate. The control of the blank-holding force depends entirely on the subjective consciousness of the person. The distribution on the surface is uneven, and the blank-holding force is mainly concentrated at the four corners of the sheet, which is in a point-pressed state, and it is impossible to apply full surface pressure to the sheet.

In addition, the traditional mechanical fixtures of progressive machine tools cannot realize the control of blank holder force, and cannot achieve variable blank holder force. The variable blank holder force mainly shows that the blank holder forces on the four sides of the press plate are independent of each other, and can be controlled simultaneously or separately. And the blank holder force can change with time during the processing

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