阅读说明：本技术 一种双耳托板螺钉托板的成型方法 (Method for forming double-lug supporting plate screw supporting plate ) 是由 王强 刘子杨 于 2018-07-27 设计创作，主要内容包括：本发明公开了一种双耳托板螺钉托板的成型方法：多工位冷镦机镦制T型毛坯,软化退火,预处理：吹砂、磷化、皂化,压力机镦扁成型1.5mm厚托板,冲切托板外形,热处理至σb=590-735MPa,本发明实现双耳托板的直接镦扁成型,解决镦制模具寿命低,车削托板厚度加工效率低,表面粗糙度差的问题,并降低生产成本。(The invention discloses a method for molding a double-lug supporting plate screw supporting plate, which comprises the following steps: upsetting a T-shaped blank by a multi-station cold header, softening, annealing and pretreating: blowing sand, phosphorizing and saponifying, upsetting and molding a 1.5mm thick supporting plate by a press, punching the appearance of the supporting plate, and performing heat treatment to the temperature of sigma b = 590-charge 735 MPa.)

1. A method for forming a double-lug supporting plate screw supporting plate is characterized in that: the method comprises the following process steps:

(1) upsetting a T-shaped blank: cutting the wire material into a T-shaped blank on a multi-station cold header;

(2) softening and annealing: putting the T-shaped blank into a leather case, burying parts with cast iron sand, sealing the leather case, sealing the case cover with quartz sand, and annealing at the following temperature: keeping the temperature at 680 +/-10 ℃ for 7 hours; then the sheet iron box is taken out of the furnace and naturally cooled;

(3) pretreatment before molding: removing annealing oxide skin by adopting a sand blowing process, and carrying out phosphating and saponification process treatment on the blank;

(4) upsetting a forming supporting plate by a press: forming a supporting plate on the pretreated T-shaped blank on a crank press; the pallet profile is then die cut.

2. The method of claim 1 wherein the method further comprises: and (3) the annealing equipment for softening and annealing in the step (2) is a box-type electric furnace.

3. The method of claim 1 wherein the method further comprises: and (2) in the step (2), the iron sheet box is not opened when the iron sheet box is discharged from the furnace and naturally cooled.

Technical Field

The invention belongs to the technical field of aviation manufacturing, and particularly relates to a method for molding a double-lug supporting plate screw supporting plate.

Background

In aircraft assembly, a large number of double-lug supporting plate screws are used for connection. The shape of the part is shown in fig. 1 and fig. 2, and the structure of the part comprises a threaded rod 1 and a double-lug supporting plate 2. The part material is ML25 (material strength sigma b =590-735 MPa), the part strength sigma b =590-735MPa, the thread diameter is M3-M6, the rod part length is 10-40 mm, the thickness of the support plate is 1.5mm, the aspect ratio of the support plate is 2:1, and the length of the support plate is 18-26 mm. The molding of the double-lug supporting plate is a processing difficulty of the part.

The current method for forming the double-lug supporting plate screw supporting plate in the aerospace industry comprises the following steps: upsetting a 2.0mm thick supporting plate by a multi-station cold header, annealing and destressing, turning the thickness of the supporting plate to be 1.5mm, punching the appearance of the supporting plate, and annealing and destressing.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a method for molding a double-lug supporting plate screw supporting plate, which realizes the direct upsetting molding of the double-lug supporting plate, solves the problems of short service life of an upsetting mold, low thickness processing efficiency of a turning supporting plate and poor surface roughness and reduces the production cost.

In order to solve the technical problems, the invention adopts the technical scheme that:

a method for forming a double-lug supporting plate screw supporting plate is characterized in that: the method comprises the following process steps:

(1) upsetting a T-shaped blank: cutting the wire material into a T-shaped blank on a multi-station cold header;

(2) softening and annealing: putting the T-shaped blank into a leather case, burying parts with cast iron sand, sealing the leather case, sealing the case cover with quartz sand, and annealing at the following temperature: keeping the temperature at 680 +/-10 ℃ for 7 hours; then the sheet iron box is taken out of the furnace and naturally cooled;

(3) pretreatment before molding: removing annealing oxide skin by adopting a sand blowing process, and carrying out phosphating and saponification process treatment on the blank;

(4) upsetting a forming supporting plate by a press: forming a supporting plate on the pretreated T-shaped blank on a crank press; the pallet profile is then die cut.

And (3) the annealing equipment for softening and annealing in the step (2) is a box-type electric furnace.

And (2) in the step (2), the iron sheet box is not opened when the iron sheet box is discharged from the furnace and naturally cooled.

The invention has the following advantages:

compared with the prior art, the invention has the following positive effects and is applied to actual production:

1. the deformation degree of the multi-station cold header is reduced, the forming force acting on the cold header is reduced, and the service life of the cold header is prolonged by more than 150%;

the 2.1.5 mm thick supporting plate is directly formed by upsetting through a press, the forming time is 5 seconds per piece, and the efficiency is improved by 60 times compared with the efficiency of turning the supporting plate by a lathe for 5 minutes per piece;

3. the surface roughness of the upsetting-made supporting plate is Ra1.6, which is improved by two grades compared with the cutting roughness Ra6.3.

Drawings

FIG. 1 is a schematic structural view of a binaural supporting plate screw;

FIG. 2 is a schematic diagram of a bracket structure of a binaural bracket screw;

the labels in the figure are: 1. threaded rod, 2, ears layer board.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following examples, which are conventional unless otherwise specified, and the materials are commercially available from the public unless otherwise specified.

The invention provides a method for molding a double-lug supporting plate screw supporting plate, which comprises the following steps: upsetting a T-shaped blank by a multi-station cold header, softening and annealing, and pretreating: blowing sand, phosphorizing, saponifying, upsetting and molding a supporting plate with the thickness of 1.5mm by a press, punching the appearance of the supporting plate, and carrying out heat treatment to sigma b = 590-charge 735 MPa.