CN-121988653-A - Cold press forming and heat treatment method for spherical composite metal plate

CN121988653ACN 121988653 ACN121988653 ACN 121988653ACN-121988653-A

Abstract

The invention relates to a cold press forming and heat treatment method of a spherical composite metal plate, which comprises the steps of cold press forming of the spherical composite metal plate, detection after cold press forming, part charging and heat preservation after heat treatment, part discharging and air cooling and inspection after heat treatment. Through carrying out annular cold pressing on the plate from the edge to the center according to preset parameters in stages, progressive uniform plastic deformation of the plate is realized, and local stress concentration and elastic resilience are remarkably reduced. The problems of difficult precision control and large rebound quantity in the processing of the spherical composite metal plate are fundamentally solved by combining detection after cold press molding. Meanwhile, the heat treatment process is optimized, the full release of the residual stress of the spherical composite metal plate is realized, and the forming precision and the surface quality of the spherical composite metal plate after heat treatment are improved.

Inventors

MENG PENG
ZHU YU
WU CHAOHUI
LIU QIANG
ZHU YONGAN
CAI JIANXIONG

Assignees

江南造船(集团)有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (9)

1. A cold press forming and heat treatment method for a spherical composite metal plate, which is characterized by comprising the following steps: Cold press forming of the spherical composite metal plate, namely cold pressing the plate from the edge to the center in a ring manner according to preset parameters by stages by using an oil ton machine and a die, wherein the preset parameters comprise single-point processing pressure, feeding quantity, pressing quantity, pressure maintaining time and pressure bearing point quantity; Detecting after cold press molding, including detecting part precision sample plates, and detecting part contour lines, surface quality and combination rate; heat treatment parts are charged and kept warm, namely, the furnace temperature is heated to a preset heat treatment temperature, then the parts are charged, and the heat is kept for a preset time after the part temperature reaches the preset heat treatment temperature; discharging the parts and air-cooling, namely after the furnace returning is finished, hanging the parts off a furnace car for air-cooling; and (3) checking after heat treatment, including part precision sample plate detection and heat treatment detection.
2. The cold press forming and heat treatment method of a spherical composite metal plate according to claim 1, further comprising a preparation work before cold press forming, including checking the condition of the incoming material, the condition of the cutting and scribing, and the condition of the cut parts, before the cold press forming of the spherical composite metal plate; the cutting and scribing conditions comprise whether the incoming materials have furnace batch number marks and whether the incoming materials are smooth, the cutting and scribing conditions comprise whether scribing is complete and scribing precision meets standard requirements, and the part conditions after cutting comprise whether cutting precision meets the standard requirements.
3. The cold press forming and heat treatment method of a spherical composite metal plate according to claim 1, wherein the cold press forming of the plate from the edge to the center in the circumferential direction according to the preset parameters in stages is performed in a mode that the curvature of the mold is large to small, and the curvature of the mold adopted in the last cold press before cold press forming is smaller than the target curvature of the spherical surface.
4. The cold press forming and heat treatment method of a spherical composite metal plate according to claim 1, wherein in the cold press forming process of the spherical composite metal plate, if abnormal deformation occurs in the plate, cold press is continued after timely treatment and correction.
5. The cold press forming and heat treatment method of a spherical composite metal plate according to claim 1, further comprising a pre-heat treatment preparation before the heat treatment part is charged and kept warm, wherein the pre-heat treatment preparation comprises a heat treatment furnace state inspection and a pre-heat treatment part inspection; The part inspection before heat treatment comprises the steps of checking whether a temperature thermocouple is installed at the center position of one surface of the spherical composite metal plate substrate, wiring and checking whether a shape-preserving tool is installed on the surface of the spherical composite metal plate substrate.
6. The cold press forming and heat treatment method for spherical composite metal plates according to claim 1, wherein, The part precision template detection comprises the steps of firstly positioning by using a sample box, drawing a spherical center point of a part, taking out the sample box, then checking the straightness of a triangular template inspection line and the clearance between a curved plate and the template by using a single curved template along a 30-degree bisector, and then measuring the space straight line distance of an intersection point of the contour line of the spherical composite metal plate by using a tape measure or a sample rod; The drawing of the part contour line comprises the steps of after the detection of the part precision sample plate, repositioning the sample box, and drawing a theoretical edge contour line of the part on the part after the accurate placement of the alignment spherical center line.
7. The cold press forming and heat treatment method of a spherical composite metal plate according to claim 1, wherein the surface quality and bonding rate detection includes detection of composite surface quality by direct visual inspection and penetration detection, detection of substrate quality by magnetic powder, and detection of composite metal plate substrate and composite bonding rate by ultrasonic waves.
8. The cold press forming and heat treatment method of the spherical composite metal plate according to claim 1, wherein the heat treatment detection comprises the steps of respectively detecting the surface quality of a base material and a composite material of the composite metal plate by adopting a direct visual, magnetic powder and penetration detection method, detecting the bonding rate of the composite metal plate by adopting ultrasonic waves, and detecting the performance of the base material and the intergranular corrosion of the composite material by adopting a sample test method.
9. The method of cold press forming and heat treating a spherical composite metal sheet according to claim 1, further comprising: After the heat treatment is finished, a detailed temperature-time curve, a back furnace heat treatment record table and a part precision measuring table are reserved; and after heat treatment, checking, executing, recording and closing loop according to the quality plan requirements, executing relevant files of a quality assurance system, and compiling a quality plan and detailed heat treatment technical file.

Description

Cold press forming and heat treatment method for spherical composite metal plate Technical Field The invention relates to the technical field of processing of spherical composite metal plates, in particular to a cold press forming and heat treatment method of a spherical composite metal plate. Background The composite metal sheet is generally formed by compounding different metal materials. For some high-strength composite metal plates (for example, composite steel plates, the composite steel plates are formed by explosion and compounding high-strength low-alloy steel and 304L stainless steel), the defects of difficult precision control and large rebound amount generally exist when spherical surface machining forming is carried out, and meanwhile, an effective heat treatment mode and an effective precision control method are lacked, so that the spherical surface composite metal plate is lower in forming precision and poorer in surface quality after heat treatment. Disclosure of Invention In order to at least partially solve the problems in the prior art, the invention provides a cold press forming and heat treatment method for a spherical composite metal plate. A cold press forming and heat treatment method for a spherical composite metal plate, the method comprising: Cold press forming of the spherical composite metal plate, namely cold pressing the plate from the edge to the center in a ring manner according to preset parameters by stages by using an oil ton machine and a die, wherein the preset parameters comprise single-point processing pressure, feeding quantity, pressing quantity, pressure maintaining time and pressure bearing point quantity; Detecting after cold press molding, including detecting part precision sample plates, and detecting part contour lines, surface quality and combination rate; heat treatment parts are charged and kept warm, namely, the furnace temperature is heated to a preset heat treatment temperature, then the parts are charged, and the heat is kept for a preset time after the part temperature reaches the preset heat treatment temperature; discharging the parts and air-cooling, namely after the furnace returning is finished, hanging the parts off a furnace car for air-cooling; and (3) checking after heat treatment, including part precision sample plate detection and heat treatment detection. Optionally, before the cold press forming of the spherical composite metal plate, preparing work before cold press is further included, including checking the condition of incoming materials, the condition of cutting and scribing and the condition of parts after cutting; the cutting and scribing conditions comprise whether the incoming materials have furnace batch number marks and whether the incoming materials are smooth, the cutting and scribing conditions comprise whether scribing is complete and scribing precision meets standard requirements, and the part conditions after cutting comprise whether cutting precision meets the standard requirements. Optionally, the step of cold pressing the plate from the edge to the center in the circumferential direction according to preset parameters is performed in a mode that the curvature of the die is large to small, and the curvature of the die adopted by the last cold pressing before cold pressing forming is smaller than the target curvature of the spherical surface. Optionally, in the cold press forming process of the spherical composite metal plate, if abnormal deformation occurs to the plate, cold press is continued after correction in time. Optionally, before the heat treatment part is charged and kept warm, the method further comprises a preparation work before heat treatment, wherein the preparation work before heat treatment comprises a heat treatment furnace state check and a part check before heat treatment; The part inspection before heat treatment comprises the steps of checking whether a temperature thermocouple is installed at the center position of one surface of the spherical composite metal plate substrate, wiring and checking whether a shape-preserving tool is installed on the surface of the spherical composite metal plate substrate. Optionally, the part precision template detection comprises the steps of firstly positioning by using a sample box, drawing a spherical center point of a part, taking out the sample box, then checking the straightness of a triangular template inspection line and the clearance between a curved plate and the template by using a single curved template along a 30-degree bisector, and then measuring the space straight line distance of the intersection point of the contour line of the spherical composite metal plate by using a tape measure or a sample rod; The drawing of the part contour line comprises the steps of after the detection of the part precision sample plate, repositioning the sample box, and drawing a theoretical edge contour line of the part on the part after the accurate placement of the align