Manufacturing process for manufacturing large ship-used shafting forge pieces
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A marine shafting and manufacturing process technology, applied in the direction of manufacturing tools, furnace types, engine components, etc., can solve the problems of high production cost, low work efficiency, and low utilization rate of steel ingots, so as to reduce production cycle and cost, and eliminate waste point, the effect of low forging cost
Inactive Publication Date: 2018-08-28
WUXI HONGDA HEAVY IND
View PDF4 Cites 14 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] In order to solve the above technical problems, the present invention provides a manufacturing process for the manufacture of large-scale marine shafting forgings to solve the problems of low steel ingot utilization, low work efficiency and high production cost in the traditional manufacturing process existing in the existing technology
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0045] The present invention will be further described below in conjunction with accompanying drawing:
[0046] as attached Figure 1-3 As shown, the manufacturing process of a large-scale marine shafting forging in this embodiment specifically includes the following steps:
[0047] Step 1, heat treatment before forging:
[0048] S1. Preliminarily heat the steel ingot, and place the forging in a heating furnace with a temperature of ≤500°C for heat preservation, and the heat preservation time is not less than 5 hours;
[0049] S2. Heating at a rate of 50±20°C / hour to slowly heat the forging to 800±20°C;
[0050] S3. Heating at a rate of 100±20°C / hour, so that the steel ingot is slowly heated to 1220±20°C, and then kept warm after being heated to 1220±20°C, and the holding time is not less than 15 hours;
[0051] Step two, forging:
[0052] The steel ingot is forged by two times of upsetting + WHF method of drawing, and the two times of upsetting and drawing are carried out...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention provides a manufacturing process for manufacturing large ship-used shafting forge pieces and belongs to the field of ship-used shafting forge pieces. The manufacturing process for manufacturing large ship-used shafting forge pieces specifically comprises the following steps: heat treatment before forging; two-time upsetting and stretching and forging (a WHF method); and thermal treatment on the forged shafting forge pieces. The two-time upsetting and stretching process is reasonable. Cast state tissues can be crushed effectively in first time stretching, and inner hole defects are forged; strip-type plastic inclusions of a core of a blank are fractured to smaller impurities in second time upsetting; the impurities are stretched to disperse impurity granules in the second stretching process, and the action of white points is eliminated effectively by the two-time upsetting process. As a result of temperature change condition in the two-time upsetting and stretching process, the solubility of hydrogen in the forge pieces changes continuously, and distribution and diffusion of hydrogen are facilitated well.
Description
technical field [0001] The invention belongs to the technical field of marine shafting forgings, and in particular relates to a manufacturing process for manufacturing large-scale marine shafting forgings. Background technique [0002] China is a country with many rivers, so shipping has naturally become an industry with great development potential. With the development of the shipbuilding industry, the demand for various forgings used on ships is also increasing. The shafting forgings commonly used in the shipbuilding industry include intermediate shafts, couplings, propeller shafts, stern shafts, propulsion shafts, camshafts, main engine bolts, gearbox bolts and nuts, etc., while the rudder forgings used include rudder stock, rudder For pins, rudder blade flange rudder stock bolts and nuts, carbon steels such as No. 20, No. 25, No. 35, and No. 45 are commonly used, as well as 20MN, 30MN, 34CrNiMo6, 20CrNi2MoA, 42CrMo4HH, and 18CrNiMo7~6 carbon-manganese steel. [0003] I...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more