CN109759531B - X-section drawing method based on center compaction - Google Patents
X-section drawing method based on center compaction Download PDFInfo
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- CN109759531B CN109759531B CN201910022131.2A CN201910022131A CN109759531B CN 109759531 B CN109759531 B CN 109759531B CN 201910022131 A CN201910022131 A CN 201910022131A CN 109759531 B CN109759531 B CN 109759531B
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Abstract
The invention discloses a central compaction-based X-section drawing method, which is characterized in that a T-shaped narrow anvil is utilized to respectively press concave shapes on an upper surface, a lower surface, a left surface and a right surface, so that the cross section profile of a prefabricated blank is in an X shape. At the moment, the metal core is easy to forge, and the transverse cracking of the core can be inhibited; the flat end face of a boss at the front end of the T-shaped narrow anvil is used for respectively pressing down the convex metals at the corner parts at two opposite sides of the prefabricated blank, and the convex metals at the corner parts are pressed into the main body of the prefabricated blank from the four corners, so that the tangential strain of the center part in the diagonal direction is inhibited, and the diagonal looseness is eliminated; meanwhile, the left concave part and the right concave part of the prefabricated blank can generate a compressive stress component pointing to the core part, so that the transverse tensile stress of the core part can be reduced or even eliminated, and finally the high-quality completion of the initial blank drawing work is realized.
Description
Technical Field
The invention relates to the technical field of metal forging, in particular to an X-section drawing method based on center compaction.
Background
In the process of drawing out a rectangular section metal forging, defects such as core cracking, diagonal looseness and the like often occur, which are caused by transverse tensile stress occurring in the core of the cross section of the forging and shear strain generated at the diagonal, and the defects directly influence the quality of the forging.
In order to solve the above problems, according to the mechanics theory and experimental research results, the current common methods can be summarized as the following aspects: firstly, when a flat anvil is used for drawing, the center of a forging piece is fully deformed under hydrostatic pressure as much as possible by reasonably adjusting the anvil width ratio and the material width ratio to achieve the purpose of compacting the center, however, the pressing amount of each time is not too large due to the limitation of reasonable intervals of the anvil width ratio and the material width ratio, and the working efficiency is influenced; secondly, the horizontal tensile stress of the core is reduced or even eliminated by changing the shape of the swage anvil, such as a V-shaped swage anvil, a ladder-shaped swage anvil and the like, so as to achieve the purpose of compacting the core, however, the load required by each method is increased by times, and the uniformity of the deformation of the cross section of the forge piece is not easy to control, thereby further influencing the forming quality of the forge piece; thirdly, the internal temperature gradient of the blank before forging is changed by a rapid water cooling method, the surface metal is rapidly cooled to form a hard shell, the outer hard shell metal is used for restraining the transverse deformation of the core metal, and the narrow anvil is used for drawing out, so that the core can also obtain larger deformation under a small rolling reduction, and the purpose of compacting the core is achieved.
Disclosure of Invention
Aiming at the problems, the invention provides an X-section drawing method based on center compaction, aiming at overcoming the defects of the prior method and improving the drawing method of the center quality of a rectangular-section blank, and the process is particularly suitable for the drawing process of the large-size long-axis rectangular-section blank.
The technical scheme of the invention is to provide an X-section drawing method, wherein a T-shaped narrow anvil is used for respectively pressing an upper face, a lower face and a left face and a right face to form concave shapes, the prefabricated blank with the X-shaped cross section is obtained, the T-shaped narrow anvil is used for carrying out secondary pressing on the prefabricated blank with the X-shaped cross section, so that the mechanical state of the interior of the blank when the blank with the rectangular section is drawn by a flat anvil is changed, and the T-shaped narrow anvil can enable the initial blank to still keep the required concave shape and size under large pressing amount. Based on the metal plastic mechanics theory, when the flat end face of the front end boss of the T-shaped narrow anvil is used for pressing the X-shaped precast blank, a difficult deformation area with a cross section similar to a triangle is not generated under the influence of protruding metal at the corners of the upper side and the lower side of the precast blank, so that a shear strain area in the blank is disturbed, and thus when the X-shaped precast blank exceeds the range of the material width ratio, the shear stress of the center in the diagonal direction is not generated, the generation of diagonal cracks is inhibited, and in the pressing process, the transverse pressure stress component is generated under the influence of concave shapes at the two sides of the X-shaped precast blank, so that the transverse tensile stress of the center can be ensured under the condition of a large material width ratio.
The specific implementation steps in the drawing process are as follows:
(1) selecting an anvil with a proper specification according to the final size required by the finished blank, wherein the specification of the T-shaped narrow anvil is selected according to the principle that the length L of the flat end surface of the front-end boss of the T-shaped narrow anvil is larger than the final size of the finished blank, the preferable range is larger than 15% -20% of the final size of the finished blank, the height H of the front-end boss of the T-shaped narrow anvil is selected properly according to the drawing pass requirement, the preferable range is 10% -20% of the final size of the finished blank, the slope α of the front-end boss of the T-shaped narrow anvil is preferably in the range of 20-40 degrees, and the anvil width ratio of the T-shaped narrow anvil is preferably in the range of 0.5-0.9;
(2) pressing concave surfaces with proper sizes on the upper surface and the lower surface of the initial blank by using the T-shaped narrow anvil part, and then continuously pressing downwards, so that the center of the blank is completely forged, the pressing amount is proper, but the height of the pressed initial blank is larger than the width of the flat end surface of a boss at the front end of the T-shaped narrow anvil, so that the initial blank is turned by 90 degrees clockwise along the central X axis of the initial blank, and then the other two surfaces are subjected to indentation treatment;
(3) then, the initial blank is turned 90 degrees clockwise along the central X axis of the initial blank, proper concave surfaces are pressed on the other two surfaces, and then the blank is continuously pressed downwards, so that the height of the prefabricated blank is smaller than the width of the flat end surface of the boss at the front end of the T-shaped narrow anvil, and the purpose is that the whole upper surface of the prefabricated blank can be pressed by utilizing the boss part at the front end of the T-shaped narrow anvil after the prefabricated blank is turned 90 degrees clockwise along the central X axis of the initial blank, so that anvil replacement is not needed; finally, the cross section of the prefabricated blank is shaped like an X. (2) In the process of (3), because the metal below the T-shaped narrow anvil deforms greatly and the metal at the core is easily forged through, the transverse crack at the core cannot be caused, and the effect of compacting the core is achieved;
(4) and turning the X-shaped prefabricated blank clockwise by 90 degrees along the central X axis of the X-shaped prefabricated blank, utilizing the flat end surface of the boss at the front end of the T-shaped narrow anvil to press the convex metal at the corner parts at the upper side and the lower side in the X-shaped prefabricated blank downwards, and pressing the metal in the area into the main body of the X-shaped prefabricated blank until the metal is pressed flatly. In the process, the corner convex metal is pressed into the X-shaped prefabricated blank main body from four corners, so that the generation of the shear strain of the center in the diagonal direction is inhibited, and the diagonal loose defect is eliminated. In the whole pressing process, the concave surfaces on the left side and the right side form pressure components pointing to the heart part, so that the heart part can be kept pressed transversely; according to the method, the prefabricated blank with the flattened upper and lower surfaces is turned over 90 degrees clockwise along the central X axis of the prefabricated blank for the third time, and the other two surfaces are pressed until the specified size is finished;
in the step (4), if the height of the prefabricated blank does not meet the size requirement of the finished blank after the upper surface is flattened, continuing to press down to enable the cross section profile to continue to be in an X shape; and then, clockwise turning the X-shaped prefabricated blank by 90 degrees along the central X axis, pressing down the corner convex metals on the other two surfaces again by utilizing the flat end surface of the boss at the front end of the T-shaped narrow anvil, flattening the upper surface of the T-shaped narrow anvil if the height of the prefabricated blank reaches the size requirement of the finished blank, repeating the operation until the height of the prefabricated blank reaches the size requirement of the finished blank after the upper surface is flattened, clockwise turning the prefabricated blank with the flattened upper surface and the flattened lower surface by 90 degrees along the central X axis, flattening the other two surfaces, and finally obtaining the finished blank meeting the size requirement.
Preferably, the front end boss of the T-shaped narrow anvil is a concave shape required for drawing.
Preferably, when the T-shaped narrow anvil presses the initial blank with a rectangular cross section, because the width of the front end boss of the T-shaped narrow anvil is relatively narrow, the deformation of the metal below is relatively large, and the metal in the core is easily forged through, the center does not generate a transverse crack, and the blank continues to be pressed down after being pressed into a required concave shape, so that the core obtains a relatively large deformation.
Preferably, the flat end of the front end boss of the T-shaped narrow anvil presses down the convex metal at the upper and lower opposite corner parts of the X-shaped precast blank, so that a diagonal shear strain region is not formed inside the X-shaped precast blank, and the core is always in a compressive stress state due to a compressive stress component directed to the core generated by the left and right concave shapes of the X-shaped precast blank, thereby inhibiting the generation of defects such as diagonal looseness, transverse cracks and the like.
Preferably, the specification of the T-shaped narrow anvil is selected according to the principle that the flat end surface length L of the front end boss of the T-shaped narrow anvil should be larger than the final size of the finished blank, preferably in the range of 15% -20% larger than the final size of the finished blank, the height H of the front end boss of the T-shaped narrow anvil is properly selected according to the drawing pass requirement, preferably in the range of 10% -20% of the final size of the finished blank, the front end boss slope α of the T-shaped narrow anvil is preferably in the range of 20-40 °, and the anvil width ratio of the T-shaped narrow anvil is preferably in the range of 0.5-0.9.
Preferably, the selection of the range of the single pressing amount during the drawing is carried out according to the principle that after the first pressing amount is the concave shape required by the extrusion, the blank is pressed again by about 5% -8% of the height of the initial blank, and after the second pressing amount is the concave shape required by the extrusion, the blank is pressed again, wherein the pressing amount is that the height of the prefabricated blank after pressing is smaller than the length L of the flat end surface of the boss at the front end of the T-shaped narrow anvil, the height of the prefabricated blank after pressing is about 85% -95% of the height of the L, the cross section area of the blank is reduced due to the axial extension of the blank, so that the pressing amount of the last times is gradually reduced compared with the pressing amount of the second time, and the selection is suitable according.
Preferably, starting from the shape of the blank, the mechanical state of the core is improved and said T-shaped narrow anvil is designed so that the desired shape of the blank is obtained during the drawing process without any prior treatment of the blank before drawing.
Compared with the traditional drawing process, the method has the following advantages:
a method for drawing X section does not need to form reasonable temperature gradient in advance, meanwhile, the T-shaped narrow anvil used in the work does not increase the required load, but slightly reduces the load compared with a common flat anvil, when the T-shaped narrow anvil presses an initial blank into an X-shaped prefabricated blank, the limitation of the material width ratio when the original flat anvil draws a rectangular section blank can be broken, the stress state of the center of a forging piece is improved by changing the shape of the blank, and the forging piece still cannot form transverse tensile stress under the condition of a larger material width ratio, so that the single pressing amount can be properly increased, and the drawing efficiency and the forming quality are improved.
Drawings
FIG. 1 is a T-shaped narrow anvil for use in the center compaction based X-section elongation method of the present invention;
FIGS. 2 a-2 f are schematic views of the process for drawing out an X-section based on center compaction according to the present invention;
3 a-3 b are comparisons of the internal shear strain field of the center compaction based X-section drawing method of the present invention with a flat anvil drawing process; and
fig. 4 a-4 b are comparisons of the internal transverse stress field of the center compaction based X-section drawing method of the present invention with a flat anvil drawing process.
The main reference numbers:
an upper anvil 1; an initial blank 21; a preform 22; corner convex metal 23; a concave shape 24; a finished blank 25; a lower anvil 3.
Detailed Description
The invention will be described in detail with reference to the accompanying drawings for describing the technical content, the achieved purpose and the efficacy of the invention.
The invention relates to an X-section drawing method, which comprises the steps of utilizing a T-shaped narrow anvil to respectively press an upper surface, a lower surface, a left surface and a right surface to form concave shapes to obtain a prefabricated blank with an X-shaped cross section profile, utilizing the T-shaped narrow anvil to press the prefabricated blank with the X-shaped cross section profile again, and changing the mechanical state in the blank when a flat anvil draws a rectangular cross section blank, wherein the T-shaped narrow anvil can enable an initial blank to still keep the required concave shape and size under a large rolling reduction.
The method mainly comprises the following implementation steps:
step 2: heating the initial billet 21 to a start forging temperature of 1100 ℃;
and step 3: the initial blank 21 is placed in the position of the lower anvil 3, as shown in fig. 2 a;
and 4, step 4: pressing the initial blank 21 with a rectangular cross section by using a T-shaped narrow anvil to press a concave shape 24 with the same shape as the boss downwards, as shown in FIG. 2 b;
and 5: turning the initial blank 21 with the concave 24 on the upper and lower surfaces clockwise once by 90 degrees along the central X axis, as shown in FIG. 2c, pressing the other two surfaces, as shown in FIG. 2d, pressing the other two surfaces into the concave 24 again by using a T-shaped narrow anvil, so that the cross section of the initial blank 21 is in an X shape, and becomes a prefabricated blank 22 required by the subsequent steps;
step 6: continuously pressing down after the cross section of the prefabricated blank 22 is in an X shape, so that the height of the prefabricated blank 22 is slightly smaller than the width of the flat end face of the boss at the front end of the T-shaped narrow anvil, and the purpose is to press the whole upper surface of the prefabricated blank 22 by using the flat end face of the boss at the front end of the T-shaped narrow anvil after the prefabricated blank 22 is clockwise turned for 90 degrees along the central X axis of the prefabricated blank 22 for two times, so that anvil replacement is not needed;
and 7: turning the prefabricated blank 22 clockwise twice by 90 degrees along the central X axis, and pressing corner convex metals 23 on the upper side and the lower side by utilizing the flat end surface of a boss at the front end of a T-shaped narrow anvil until the flat end surfaces are pressed;
and 8: if the size is close to the final required size after the upper surface is flattened, performing step 11, and if the height of the prefabricated blank 22 does not reach the final required size, continuing to press down to enable the cross-sectional profile of the prefabricated blank 22 to continue to be in an X shape;
and step 9: then, the prefabricated blank 22 is turned over for 90 degrees clockwise again along the central X axis of the prefabricated blank, and the flat end faces of bosses at the front ends of the T-shaped narrow anvils are utilized to press the corner protruding metals 23 on the other two faces downwards again until the flat ends are pressed;
step 10: if the height of the prefabricated blank 22 does not reach the final required size, repeating the step 8, continuing pressing, and flattening if the height of the prefabricated blank 22 reaches the final size after the upper surface is flattened;
step 11: and then, clockwise turning the prefabricated blank 22 by 90 degrees along the central X axis, pressing corner protruding metals 23 on two sides of the other two faces by using the flat end face of the boss at the front end of the T-shaped narrow anvil as shown in figure 2f, drawing out the prefabricated blank 22 to the final required size, and finally obtaining a finished blank 25 meeting the final required size.
The X-section elongation method of the present invention is further described below with reference to the following examples:
the first embodiment is as follows:
the initial blank 21 was drawn to a 500mm by 500mm cube in cross section to a 300mm by 300mm cube in cross section of the finished blank 25.
The anvil specification for the T-anvil is such that the length L of the nose boss of the T-anvil is 36mm, the height H of the nose boss of the T-anvil is 4mm, the slope α of the nose boss of the T-anvil is 30 °, and the width ratio of the T-anvil is 0.8, depending on the final dimensions required for the finished blank 25.
The drawing operation steps are as follows:
(1) heating the initial billet 21 to a start forging temperature of 1100 ℃;
(2) the initial blank 21 is placed between the upper anvil 1 and the lower anvil 3 in bilateral symmetry;
(3) the lower anvil 3 is kept fixed, the upper anvil 1 presses the initial blank 21, and the first pressing amount is 200 mm;
(4) the initial blank 21 is turned 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continues to press the initial blank 21, the second pressing amount is 320mm, and then the prefabricated blank 22 with the X-shaped cross section is obtained;
(5) the prefabricated blank 22 is turned over 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continuously presses the prefabricated blank 22, and the third pressing amount is 250 mm;
(6) the prefabricated blank 22 is turned over 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continuously presses the prefabricated blank 22, and the fourth pressing amount is 250 mm;
(7) the prefabricated blank 22 is turned over by 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continuously presses the prefabricated blank 22, the concave part 24 is flattened, and the fifth pressing amount is about 100 mm.
Example two:
the initial blank 21 was drawn to a 500mm by 500mm cube in cross section to a 250mm by 250mm cube in cross section of the finished blank 25.
The anvil specification for the T-anvil is such that the tip land length L of the T-anvil is 30mm, the tip land height H of the T-anvil is 3mm, the tip land slope α of the T-anvil is 30 °, and the anvil width ratio of the T-anvil is 0.8, depending on the final dimensions required for the finished blank 25.
The drawing operation steps are as follows:
(1) heating the initial blank 21 to 1100 ℃;
(2) the initial blank 21 is placed between the upper anvil 1 and the lower anvil 3 in bilateral symmetry;
(3) the lower anvil 3 is kept fixed, the upper anvil 1 is pressed downwards, and the first pressing amount is 220 mm;
(4) the initial blank 21 is turned 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continues to press the initial blank 21, the second pressing amount is 340mm, and then the prefabricated blank 22 with the X-shaped cross section is obtained;
(5) the prefabricated blank 22 is turned over 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continuously presses the prefabricated blank 22, and the third pressing amount is 250 mm;
(6) the prefabricated blank 22 is turned over 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continuously presses the prefabricated blank 22, and the fourth pressing amount is 170 mm;
(7) the prefabricated blank 22 is turned over 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continuously presses the prefabricated blank 22, and the fifth pressing amount is 150 mm;
(8) the prefabricated blank 22 is turned over by 90 degrees clockwise along the central X axis, the lower anvil 3 is kept fixed, the upper anvil 1 continuously presses the prefabricated blank 22, the concave part 24 is flattened, and the sixth pressing amount is about 60 mm.
In order to better highlight the advantages of the X-section drawing method, the internal shear strain field in the X-section drawing method and the internal shear strain field in the flat anvil drawing method are contrastively analyzed.
Fig. 3a is a shear strain field result obtained by an X-section elongation method, fig. 3b is a shear strain field result obtained by a process of drawing a rectangular-section blank by using a flat anvil, and by comparing fig. 3a and 3b, it can be seen that, when the rectangular-section blank is drawn by using the flat anvil, if the rectangular-section blank exceeds the range of the material-to-width ratio, a hard-to-deform region with a cross-section approximately triangular is formed due to the influence of friction between the anvil surface and the blank surface, under the influence of the hard-to-deform region, a diagonal-shaped shear strain region is generated at the center, and the shear strain region disappears until the rectangular-section blank enters the range of the reasonable material-to-width ratio, so that the shear stress in the diagonal direction of the center occurs within a period of time during the elongation process, and after the blank is turned over 90 ° along its central X axis, if the rectangular-section blank still exceeds the range of the material-to-width, under repeated pulling of shear stress, diagonal cracks are easily caused in the core region.
In the drawing process of the X-section drawing method, due to the difference between the X-shaped section and the rectangular section, a difficult deformation area with a cross section approximate to a triangle is not generated under the influence of the convex metal at the corners of two ends, so that a shear strain area in the blank is disturbed, and thus when the width ratio of the material of the X-shaped section blank exceeds the range of the material width ratio, the shear stress in the diagonal direction of the center part is not generated, and the generation of diagonal cracks is inhibited.
In order to better highlight the advantages of the X-section drawing method, the X-section drawing method and the flat anvil drawing method are subjected to comparative analysis of internal transverse stress fields.
Fig. 4a is the result of transverse stress field obtained by X-section elongation method, fig. 4b is the result of transverse stress field obtained by flat anvil elongation process, and comparing fig. 4a and 4b, it can be seen that when rectangular section blank is flat anvil elongated, if the rectangular section blank exceeds the range of material width ratio, transverse tensile stress will occur in the core, and during ingot solidification, the core is more likely to have defects of air holes, inclusions, coarse grains and the like, so that the core of the blank will crack under the action of small transverse tensile stress.
The X-section drawing method is used for drawing under the same material-width ratio, and under the influence of concave shapes on two sides of an X-section blank, a transverse compressive stress component is generated, so that the core part can not generate transverse tensile stress under the condition of a large material-width ratio.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. A central compaction-based X-section drawing method is characterized in that a T-shaped narrow anvil is used for respectively pressing concave shapes on the upper surface, the lower surface, the left surface and the right surface of the blank to obtain a prefabricated blank with an X-shaped cross section profile, and then the T-shaped narrow anvil is used for carrying out secondary pressing on the prefabricated blank with the X-shaped cross section profile, so that the internal mechanical state of the blank is changed when the blank with the rectangular section is drawn by a flat anvil, the T-shaped narrow anvil can enable an initial blank to still keep the required concave shape and size under large pressing amount, and the specific implementation steps are as follows:
(1) pressing the initial blank with the rectangular cross section in the up-down direction by using the T-shaped narrow anvil to press a required concave shape, then clockwise turning the initial blank by 90 degrees along the central X axis of the initial blank, then pressing down again by using the T-shaped narrow anvil to press the required concave shape, and finally obtaining a prefabricated blank with the X-shaped cross section profile; when the T-shaped narrow anvil presses an initial blank with a rectangular cross section, the width of a boss at the front end of the T-shaped narrow anvil is narrow, the contact surface of the initial blank is larger than that of the T-shaped narrow anvil, so that the center of the initial blank cannot generate transverse cracks, and meanwhile, after the height of the prefabricated blank is smaller than the width of the flat end surface of the boss at the front end of the T-shaped narrow anvil, the whole upper surface of the prefabricated blank can be pressed by using the flat end surface of the boss at the front end of the T-shaped narrow anvil;
(2) pressing the convex metal at the corner part of the X-shaped prefabricated blank, which is opposite to the upper part and the lower part, downwards by using the flat end surface of the boss at the front end of the T-shaped narrow anvil, pressing the metal into the X-shaped prefabricated blank, and then continuously pressing downwards by a preset pressing amount according to the required size of the finished blank; then, the prefabricated blank is turned over 90 degrees clockwise along the central X axis of the prefabricated blank, the flat end face of the boss at the front end of the T-shaped narrow anvil is utilized to press down the corner protruding metals on the two remaining faces again, and after the metals are pressed into the prefabricated blank, the pressing down is continued according to the final size required by the finished blank; finally obtaining the finished blank meeting the size requirement.
2. The center-compaction-based X-section drawing method according to claim 1, wherein the front end boss of the T-shaped narrow anvil is concave in shape required for drawing.
3. The center-compaction-based X-section elongation method as claimed in claim 1, wherein the flat end surfaces of the T-shaped narrow anvil front end bosses press down the upper and lower opposite corner convex metals of the X-shaped precast blank, so that no diagonal shear strain zone is formed inside the X-shaped precast blank, and the core part is always in a compressive stress state due to the compressive stress component directed to the core part generated by the left and right concave shapes of the X-shaped precast blank, thereby inhibiting the generation of diagonal looseness and transverse cracks.
4. The center-compaction based X-section elongation method according to claim 3, wherein the T-shaped narrow anvil specification is selected such that the flat end face length L of the T-shaped narrow anvil nose boss is greater than 15% to 20% of the final dimension of the finished blank, the T-shaped narrow anvil nose boss height H ranges from 10% to 20% of the final dimension of the finished blank, the T-shaped narrow anvil nose boss slope α ranges from 20 ° to 40 °, and the T-shaped narrow anvil width ratio ranges from 0.5 ° to 0.9.
5. The method for drawing an X-section based on center compaction according to claim 4, wherein the range of the single pressing amount during drawing is selected such that the pressing amount is 5% -8% of the initial blank height after the first pressing amount is the concave shape required for extrusion, and the pressing amount is 5% -95% of the L after the second pressing amount is the concave shape required for extrusion, and the pressing amount is that the height of the prefabricated blank after pressing is less than the length L of the flat end face of the boss at the front end of the T-shaped narrow anvil, so that the height of the prefabricated blank after pressing is 85% -95% of the L.
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| KR101220738B1 (en) * | 2010-12-27 | 2013-01-09 | 주식회사 포스코 | Forging method of Heavy Thick Plate |
| CN205393435U (en) * | 2016-03-07 | 2016-07-27 | 东南大学 | Modular forging instrument |
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