CN103495687B - A kind of connecting pin hot forging and hot extrusion composite accurate forming technology - Google Patents
A kind of connecting pin hot forging and hot extrusion composite accurate forming technology Download PDFInfo
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- CN103495687B CN103495687B CN201310415262.XA CN201310415262A CN103495687B CN 103495687 B CN103495687 B CN 103495687B CN 201310415262 A CN201310415262 A CN 201310415262A CN 103495687 B CN103495687 B CN 103495687B
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Abstract
The invention belongs to technical field of forging, be specifically related to a kind of connecting pin hot forging and hot extrusion composite accurate forming technology, comprise first time hot forging and be shaped and second time single-ended localized heat extruding precision form; Rely on existing forging die by blank radially die forging, can obtain and only have single-ended local without draft angle and the recessed fillet of minimum transition
mm does not also reach the connecting pin forging part of net shape and dimensional requirement; Rely on hot extruding die that the be shaped part that also do not reach micron order shape and dimensional requirement of first time hot forging is carried out to the single-ended localized heat of axis again and extruded precision form, finally reach single-ended local and only forge without draft angle and the recessed fillet of minimum transition
the micron order shape of mm and dimensional requirement.Achieve connecting pin forging part monolithic molding and (not machined) is forged only without draft angle and the recessed fillet of minimum transition in single-ended local
the micron order shape of mm and dimensional requirement.
Description
Technical field
The invention belongs to technical field of forging, be specifically related to a kind of connecting pin hot forging and hot extrusion composite accurate forming technology.
Background technology
Connecting pin forging part has single-ended local and only forges (not machined) without draft angle and the recessed fillet of minimum transition
the micron order shape of mm and size, do not allow supplementary machined, otherwise this place can be cut off along the equally distributed metal streamline of part transition recessed fillet profile and produce the phenomenon that stress concentrates and rupture.
From GB12362 " steel forging part tolerance and machine-finish allowance " national standard: forging part micron order tolerance divides whole micron order and the large classification of local micron order two; The single-ended local of connecting pin forging part is without draft angle and the recessed fillet of minimum transition
mm, namely connecting pin forging part is local micron order forging part.Under existing die forging condition, if adopt existing hot forging forming technology separately, can only reach except the single-ended local of connecting pin is without draft angle and the recessed fillet of minimum transition
all shapes beyond mm and the requirement of size; If adopt existing hot extrusion forming process separately, the connecting pin forging part that can only be shaped is single-ended without draft angle and the recessed fillet of minimum transition
mm waits local shape and size, but cannot be shaped connecting pin other all shapes and size.
Hot forging and hot extrusion combined forming process process in conjunction with combined shaping existing hot forging processing and existing hot extrusion to obtain a kind of processing method of the forging part of required form, size and performance.
Summary of the invention
The object of the present invention is to provide a kind of connecting pin hot forging and hot extrusion composite accurate forming technology, achieve connecting pin forging part monolithic molding and single-ended local under existing forging condition and only forge (not machined) without draft angle and the recessed fillet of minimum transition
the requirement of mm micron order shape and size.
Technical scheme of the present invention is, connecting pin hot forging and hot extrusion composite accurate shaping process are:
1) hot forging (containing heating, die forging and trimming): be first time hot forging shaping stage, can obtain and only have single-ended local without draft angle and the recessed fillet of minimum transition
mm does not also reach the connecting pin forging part of net shape and dimensional requirement.
2) hot extrusion (containing heating and extruding): be the second time single-ended localized heat extruding precision form stage, finally can by single-ended for connecting pin forging part local draft angle 10 ° and compared with the recessed fillet R10mm of great transition become respectively without draft angle with
the recessed fillet of minimum forging transition, reach connecting pin forging part local micron order shape and the requirement of size.
Described second time hot extrusion precision form realizes by hot extruding die, and hot extruding die is by punch, pedestal, drift, fixed support bar and V-type movable clamping block five chief components.
Described punch is positioned at the topmost of hot extruding die, is fixed on 1600kN forcing press by top die shank; V-type movable clamping block is arranged on the right side of punch and hot extrude casting die, on the left of drift and pedestal upper left-hand groove; Drift is arranged on the right side of V-type movable clamping block and pedestal upper right groove; Pedestal is positioned at the bottom of overall thermal extrusion die, for fixing or placement V-type movable clamping block, drift and fixed support bar; Fixed support bar is arranged in the left side of hot extrude casting die and V-type movable clamping block and is fixed on pedestal left groove hole.
Described punch working portion is used for hot extrusion and is finally shaped, and the anti-obliquity angle bottom punch working portion is 3 °, and bottom roundings is R0.8mm, and working portion height is 100mm.
Described V-type movable clamping block for clamping, the forging part that is shaped of fixing and handling first time hot forging, wherein the V-type opening angle of V-type movable clamping block is 90 °, and inside V-type, right bank angle is 3 °, and on the right side of V-type, fixed elevation is 10 °.
Described drift is used for the micro-tightness adjusting V-type movable clamping block and coordinate with hot forging of retreating at any time.
Described pedestal is used for fixing, place or support V-type movable clamping block, drift and fixed support bar.
Described fixed support bar is fixed in the shrinkage pool of pedestal, for supporting and fix the lower recess of the forging part that first time hot forging is shaped.
The invention has the beneficial effects as follows:
(1) connecting pin hot forging of the present invention and hot extrusion composite accurate forming technology, efficiently solves and under existing forging condition, is difficult to realize connecting pin die-forging forming especially reaches single-ended local without draft angle and the recessed fillet of minimum transition
a difficult problem for mm micron order shape and dimensional requirement.
(2) connecting pin hot forging of the present invention and hot extrusion composite accurate forming technology, to maximize favourable factors and minimize unfavourable ones the pluses and minuses of existing die forging forming process and existing hot extrusion forming process, be shaped by first time hot forging and second time single-ended localized heat extruding precision form, thoroughly can obtain shape and the good micron order connecting pin forging part of dimensional uniformity.
(3) simple, the compact intensity again of the structure of the hot extruding die of connecting pin hot forging of the present invention and hot extrusion composite accurate forming technology is enough, and easy to loading and unloading, dependability is high, and service efficiency is high, high life, low cost of manufacture.
(4) connecting pin hot forging of the present invention and hot extrusion composite accurate forming technology, also can be other analogous shape and size forging part is shaped and local precision die forging is shaped and provides solid reference.
Accompanying drawing explanation
Fig. 1 a is the connecting pin forging part front view schematic diagram in the present invention;
Fig. 1 b is the top view of Fig. 1 a;
Fig. 1 c is the left view of Fig. 1 a;
Fig. 2 is the existing connecting pin forging part schematic diagram in the present invention;
Fig. 3 a is the hot extruding die installation diagram schematic diagram in the present invention;
Fig. 3 b is the top view after Fig. 3 a removes punch (1);
Fig. 4 a is the front view schematic diagram of punch (1);
Fig. 4 b is the top view of Fig. 4 a;
Fig. 5 a is the front view schematic diagram of V-type movable clamping block (2);
Fig. 5 b is the top view of Fig. 5 a;
Fig. 6 a is the front view schematic diagram of drift (3);
Fig. 6 b is the top view of Fig. 6 a;
Fig. 7 a is the front view schematic diagram of pedestal (4);
Fig. 7 b is the top view of Fig. 7 a;
Fig. 8 a is the front view schematic diagram of fixed support bar (5);
Fig. 8 b is the top view of Fig. 8 a.
Detailed description of the invention
Connecting pin hot forging of the present invention and hot extrusion composite accurate shaping process are: hot forging (containing heating, die forging and trimming) → hot extrusion (containing heating and extruding).Described technique is precise forming process, and described precise forming process comprises first time hot forging and is shaped and second time single-ended localized heat extruding precision form.
(1) first time hot forging is shaped: need to rely on existing forging die to realize, in existing forging die, Integral die-forged shaping is carried out along blank radial direction after being heated to 1220 DEG C by Q345 steel billet material, and then by cutting burrs, can obtain as shown in Figure 2 only have single-ended local without draft angle (actual is 10 °) and the recessed fillet of minimum transition
mm (actual is R10mm) does not also reach the connecting pin forging part of net shape and dimensional requirement.
(2) second time single-ended localized heat extruding precision form: need to rely on hot extruding die to realize, the connecting pin forging part being about to first time hot forging shaping acquisition is heated to 1100 DEG C ~ 1150 DEG C, and then in hot extruding die, carry out the accurate hot extrusion in the single-ended local of axis, finally can become respectively without draft angle and the recessed fillet of minimum transition by single-ended for connecting pin forging part local draft angle 10 ° with compared with great transition recessed fillet R10mm
thoroughly can reach the requirement of connecting pin forging part micron order shape as illustrated in figure 1 c and size.
Described second time hot extrusion precision form needs to rely on hot extruding die to realize (as shown in Figure 3 a and Figure 3 b shows), and hot extruding die is by punch 1, V-type movable clamping block 2, drift 3, pedestal 4 and fixed support bar 5 five chief components.
Described punch 1 is positioned at the topmost of hot extruding die, is fixed on 1600kN forcing press by top die shank; V-type movable clamping block 2 is arranged on the right side of punch 1 and hot extrude casting die 6, on the left of drift 3 and pedestal 4 upper left-hand groove; Drift 3 is arranged on the right side of V-type movable clamping block 2 and pedestal 4 upper right groove; Pedestal 4 is positioned at the bottom of overall thermal extrusion die, for fixing or placement V-type movable clamping block 2, drift 3 and fixed support bar 5; Fixed support bar 5 is arranged in the left side of hot extrude casting die 6 and V-type movable clamping block 2 and is fixed on pedestal 4 left groove hole.
Simple, the compact intensity again of hot extruding die structure is enough, and easy to loading and unloading, dependability is high, and service efficiency is high, high life, low cost of manufacture.
Punch 1 working portion (as shown in figures 4 a and 4b), finally be shaped for hot extrusion, anti-obliquity gradient bottom punch (1) working portion is 3 °, and 10 °, the single-ended local chamfered portion (as shown in Figure 2) that first time hot forging can be made to be shaped becomes without gradient plane (as illustrated in figure 1 c) after hot extrusion; Punch 1 working portion bottom roundings R can not excessive (during R > 1.5mm, this hot extrusion fillet size be very easily super poor), can not too small (during R≤0.5mm very easily deformation failure again bottom punch 1), as R=0.8mm, be both conducive to meeting the recessed fillet of the minimum transition of connecting pin as illustrated in figure 1 c
requirement, be conducive to again improving service life of punch 1; Punch 1 working portion height is 100mm, 22mm is grown than respective mode forging physical length 78mm, namely the most flimsy bottom level of punch 1 working portion has the repairing removal amount of 22mm (actual value 17mm) at least, simultaneously because of the hot extrude pressure little (hot extrusion deformation amount is little) of punch 1 working portion, the service life of punch 1 also effectively can be improved.
V-type movable clamping block 2 (as shown in figure 5 a and 5b), for clamping, fix and handling forging part as shown in Figure 2, wherein V-type opening angle is 90 ° (angle corresponding with forging part contact position matches), to be conducive to clamping and fixed die forging; Inside V-type, right bank angle is 3 ° (namely forging part is also tilted to the right when Axial Thermal extrudes 3 °), can prevent punch 1 from operationally interfering phenomenon with forging matrix face, is also conducive to picking and placeing forging part simultaneously; On the right side of V type, fixed elevation is 10 ° (namely matching when fixing with 10 ° of inclined-planes of drift (3)), to be conducive to the tightness with drift fine setting V-type movable clamping block 2.
Drift 3 (as shown in figures 6 a and 6b), for the tightness that the V-type of front and back advance and retreat trace adjustment at any time movable clamping block 2 coordinates with hot forging 6, when practical operation, general only carry out clamping adjustment to 300/batches first 3, then no longer carry out clamping adjustment when hot extrude casting die picks and places smooth and easy.
Pedestal 4 (as shown in figs. 7 a and 7b), for fixing, placing or support V-type movable clamping block 2, drift 3 and fixed support bar 5.
Fixed support bar 5 (as figures 8 a and 8 b show), is operationally fixed in the shrinkage pool of pedestal 4, fits completely in inclined-plane, upper end and inclined-plane, connecting pin forging part contact position, for supporting and fix the forging part lower recess that first time hot forging is shaped.
The course of work of hot extruding die of the present invention is as follows: first, fixedly mounts complete and be fixed on 1600kN forcing press by punch 1 by hot extruding die entirety; Secondly, the forging part that first time hot forging obtains being heated to 1100 DEG C ~ 1150 DEG C is placed on the left of V-type movable clamping block 2 and on fixed support bar 5; Again, with tightness (generally often criticize and only finely tune first 3, then no longer finely tune when hot extrude casting die picks and places smooth and easy) on the right side of fine setting activity orientation block 2 of retreating before and after drift 3; Finally, in one stroke of press, axis single-ended localized heat extruding is carried out so that final shaping.
Claims (1)
1. connecting pin hot forging and a hot extrusion composite accurate forming technology, comprises first time hot forging and is shaped and second time single-ended localized heat extruding precision form; Concrete steps are as follows:
1) first time hot forging is shaped: by blank radially hot forging, can obtain and only have single-ended local not reach without draft angle and the recessed fillet of minimum transition
mm and all the other all reach the connecting pin forging part of net shape and dimensional requirement;
2) second time single-ended localized heat extruding precision form: rely on hot extruding die that the be shaped part that also do not reach micron order shape and dimensional requirement of first time hot forging is carried out to the single-ended localized heat of axis again and extruded precision form, only forge without draft angle and the recessed fillet of minimum transition finally to reach single-ended local
the micron order shape of mm and dimensional requirement.
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| CN201310415262.XA CN103495687B (en) | 2013-09-13 | 2013-09-13 | A kind of connecting pin hot forging and hot extrusion composite accurate forming technology |
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| CN201310415262.XA CN103495687B (en) | 2013-09-13 | 2013-09-13 | A kind of connecting pin hot forging and hot extrusion composite accurate forming technology |
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| CN103495687B true CN103495687B (en) | 2015-10-07 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1232355A1 (en) * | 1985-01-10 | 1986-05-23 | Харьковский политехнический институт им.В.И.Ленина | Stamp for die forging |
| CN1864881A (en) * | 2006-06-13 | 2006-11-22 | 中北大学 | Integral extrusion forming method for asymmetrical assembly parts and apparatus thereof |
| CN101607294A (en) * | 2009-07-08 | 2009-12-23 | 湖北三环锻造有限公司 | Medium and heavy automobile knuckle stamp forging extruding compound technology |
| CN102489978A (en) * | 2011-12-04 | 2012-06-13 | 北京机电研究所 | Hot and cold composite precision forging forming method of great-modulus high-thickness straight-tooth cylindrical gear |
-
2013
- 2013-09-13 CN CN201310415262.XA patent/CN103495687B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1232355A1 (en) * | 1985-01-10 | 1986-05-23 | Харьковский политехнический институт им.В.И.Ленина | Stamp for die forging |
| CN1864881A (en) * | 2006-06-13 | 2006-11-22 | 中北大学 | Integral extrusion forming method for asymmetrical assembly parts and apparatus thereof |
| CN101607294A (en) * | 2009-07-08 | 2009-12-23 | 湖北三环锻造有限公司 | Medium and heavy automobile knuckle stamp forging extruding compound technology |
| CN102489978A (en) * | 2011-12-04 | 2012-06-13 | 北京机电研究所 | Hot and cold composite precision forging forming method of great-modulus high-thickness straight-tooth cylindrical gear |
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| CN103495687A (en) | 2014-01-08 |
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