CN103495687A - Hot die forging and hot extrusion composite accurate forming technology of connecting pin - Google Patents
Hot die forging and hot extrusion composite accurate forming technology of connecting pin Download PDFInfo
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- CN103495687A CN103495687A CN201310415262.XA CN201310415262A CN103495687A CN 103495687 A CN103495687 A CN 103495687A CN 201310415262 A CN201310415262 A CN 201310415262A CN 103495687 A CN103495687 A CN 103495687A
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Abstract
The invention belongs to the technical field of forging, and particularly relates to a hot die forging and hot extrusion composite accurate forming technology of a connecting pin. The hot die forging and hot extrusion composite accurate forming technology of the connecting pin comprises the steps that primary hot die forging forming and secondary single-ended local hot extrusion accurate forming are conducted; die forging is conducted on a blank in the radial direction through an existing forging die so that a connecting pin forging die piece which can only meet the requirements that the single-ended local portion is free of a draft angle and the minimum transitional concave circular angle is R1.0+1.0/-0.5 mm but cannot meet the requirements for the final shape and size can be obtained; axial single-ended local hot extrusion accurate forming is conducted on the portion which does not meet the requirements for the accurate-level shape and size after primary hot die forging forming through a hot extrusion die, and finally, the connecting pin which can meet the requirements that the single-ended local net forging portion is free of the draft angle and the minimum transitional concave circular angle is R1.0+1.0/-0.5 mm and can also meet the requirements for the accurate-level shape and size is obtained. The requirements for integral forming of the connecting pin die forging piece and the accurate-level shape and size are met, wherein the accurate-level shape and size satisfy the requirements that the single-ended local net forging (without machining) portion does not have the draft angle and the minimum transitional concave circular angle is R1.0+1.0/-0.5 mm.
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 combined precision forming technology.
Background technology
The connecting pin forging part has single-ended part and only forges (not machined) without draft angle and the recessed fillet of minimum transition
micron order shape and the size of mm, do not allow to supplement machined, otherwise this place can be produced along the equally distributed metal streamline cut-out of the recessed fillet profile of part transition, stress is concentrated and the phenomenon of fracture.
From GB12362 " steel forging part tolerance and machine-finish allowance " national standard: forging part micron order tolerance is divided whole micron orders and the large classification of local micron order two; The single-ended part of connecting pin forging part is without draft angle and the recessed fillet of minimum transition
mm, the connecting pin forging part is local micron order forging part.Under existing die forging condition, if adopt separately existing hot forging forming technology, can only reach except the single-ended part of connecting pin without draft angle and the recessed fillet of minimum transition
all shapes beyond mm and the requirement of size; If adopt separately existing hot extrusion forming process, the connecting pin forging part that can only be shaped is single-ended without draft angle and the recessed fillet of minimum transition
local shape such as grade and the size of mm, but can't be shaped connecting pin other all shapes and size.
Hot forging and hot extrusion combined forming process are hot extrusion to be processed and had now in existing hot forging process a kind of processing method with the forging part of acquisition required form, size and performance in conjunction with combined shaping.
Summary of the invention
The object of the present invention is to provide a kind of connecting pin hot forging and hot extrusion combined precision forming technology, realized that under existing forging condition connecting pin forging part monolithic molding and single-ended part forge (not machined) only 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 that connecting pin hot forging and hot extrusion combined precision shaping process are:
1) hot forging (containing heating, die forging and trimming): be hot forging shaping stage for the first time, can obtain and only have single-ended part 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 single-ended localized heat extruding precision form stage for the second time, finally can become respectively without draft angle by 10 ° of the single-ended local draft angles of connecting pin forging part with than the recessed fillet R10mm of great transition and
the recessed fillet of minimum forging transition, reach the requirement of the local micron order shape of connecting pin forging part and size.
The described precision form of hot extrusion for the second time can realize by hot extruding die, and hot extruding die is by punch, pedestal, drift, fixed support bar and five chief components of V-type movable clamping piece.
Described punch is positioned at the topmost of hot extruding die, by the top die shank, is fixed on the 1600kN forcing press; V-type movable clamping piece is arranged in punch and hot extrude casting die right side, drift left side and pedestal upper left-hand groove; Drift is arranged in V-type movable clamping piece right side and pedestal upper right groove; Pedestal is positioned at the bottom of overall thermal extrusion die, for fixing or placement V-type movable clamping piece, drift and fixed support bar; The fixed support bar is arranged in the left side of hot extrude casting die and V-type movable clamping piece and is fixed on pedestal left groove hole.
Described punch working portion finally is shaped for hot extrusion, and the anti-obliquity angle of punch working portion bottom is 3 °, and the bottom fillet is R0.8mm, and the working portion height is 100mm.
Described V-type movable clamping piece is for clamping, fix and loading and unloading the forging part that hot forging for the first time is shaped, and wherein the V-type opening angle of V-type movable clamping piece is 90 °, and the inboard right bank angle of V-type is 3 °, and V-type right side fixed elevation is 10 °.
The tightness that described drift coordinates with hot forging for the V-type of front and back advance and retreat trace adjustment at any time movable clamping piece.
Described pedestal is for fixing, place or support V-type movable clamping piece, 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 of the shaping of hot forging for the first time.
The invention has the beneficial effects as follows:
(1) connecting pin hot forging of the present invention and hot extrusion combined precision forming technology, efficiently solve under existing forging condition and be difficult to realize that the connecting pin die-forging forming especially reaches single-ended part without draft angle and the recessed fillet of minimum transition
the difficult problem of mm micron order shape and dimensional requirement.
(2) connecting pin hot forging of the present invention and hot extrusion combined precision forming technology, the maximized favourable factors and minimized unfavourable ones pluses and minuses of existing die forging forming process and existing hot extrusion forming process, be shaped and single-ended localized heat extruding precision form for the second time by hot forging for the first time, can thoroughly obtain the micron order connecting pin forging part that shape and dimensional uniformity are good.
(3) intensity is enough again for simple in structure, the compactness of the hot extruding die of connecting pin hot forging of the present invention and hot extrusion combined precision forming technology, 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 combined precision forming technology, also can be other analogous shape and the shaping of size forging part and the shaping of local precision die forging solid reference be provided.
The accompanying drawing explanation
Fig. 1 a is the connecting pin forging part front view schematic diagram in the present invention;
The top view that Fig. 1 b is Fig. 1 a;
The left view that Fig. 1 c is 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. 1 a removes punch (1);
The front view schematic diagram that Fig. 4 a is punch (1);
The top view that Fig. 4 b is Fig. 4 a;
The front view schematic diagram that Fig. 5 a is V-type movable clamping piece (2);
The top view that Fig. 5 b is Fig. 5 a;
The front view schematic diagram that Fig. 6 a is drift (3);
The top view that Fig. 6 b is Fig. 6 a;
The front view schematic diagram that Fig. 7 a is pedestal (4);
The top view that Fig. 7 b is Fig. 7 a;
The front view schematic diagram that Fig. 8 a is fixed support bar (5);
The top view that Fig. 8 b is Fig. 8 a.
The specific embodiment
Connecting pin hot forging of the present invention and hot extrusion combined precision 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 that hot forging for the first time is shaped and single-ended localized heat extruding precision form for the second time.
(1) hot forging for the first time is shaped: need to rely on existing forging die to realize, be about to after Q345 steel billet material is heated to 1220 ℃ radially carry out the Integral die-forged shaping along blank in having forging die now, and then by cutting burrs, can obtain as shown in Figure 2 only have single-ended part 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) single-ended localized heat pushes precision form for the second time: need to rely on hot extruding die to realize, the connecting pin forging part that is about to the shaping of hot forging for the first time acquisition is heated to 1100 ℃～1150 ℃, and then carry out the accurate hot extrusion in axial single-ended part in hot extruding die, finally can and become respectively without draft angle and the recessed fillet of minimum transition than the recessed fillet R10mm of great transition 10 ° of the single-ended local draft angles of connecting pin forging part
can thoroughly reach connecting pin forging part micron order shape as shown in Fig. 1 c and the requirement of size.
The described precision form of hot extrusion for the second time need 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 piece 2, drift 3, pedestal 4 and 5 five chief components of fixed support bar.
Described punch 1 is positioned at the topmost of hot extruding die, by the top die shank, is fixed on the 1600kN forcing press; V-type movable clamping piece 2 is arranged in punch 1 and hot extrude casting die 6 right sides, drift 3 left sides and pedestal 4 upper left-hand grooves; Drift 3 is arranged in V-type movable clamping piece 2 right sides and pedestal 4 upper right grooves; Pedestal 4 is positioned at the bottom of overall thermal extrusion die, for fixing or placement V-type movable clamping piece 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 piece 2 and is fixed on pedestal 4 left groove holes.
Hot extruding die is simple in structure, intensity is enough again for compactness, 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 Fig. 4 a and Fig. 4 b), for hot extrusion, finally be shaped, the anti-obliquity gradient of punch (1) working portion bottom is 3 °, and single-ended local 10 ° of chamfered portions (as shown in Figure 2) that can make hot forging for the first time be shaped become without gradient plane (as shown in Figure 1) in hot extrusion later; Punch 1 working portion bottom fillet R can not be excessive (during R>1.5mm, this hot extrusion fillet size is very easily super poor), can not be too small when 0.5mm (R≤the very easily deformation failure again of punch 1 bottom), when R=0.8mm, both be conducive to meet the recessed fillet of the minimum transition of connecting pin as shown in Fig. 1 c
the requirement of mm, the service life that is conducive to again improve punch 1; Punch 1 working portion height is 100mm, than respective mode forging physical length, 78mm grows 22mm, it is the repairing removal amount that the most flimsy bottom level of punch 1 working portion has 22mm (actual value 17mm) at least, while is because of the hot extrude pressure little (the hot extrusion deformation amount is little) of punch 1 working portion, the service life that also can effectively improve punch 1.
V-type movable clamping piece 2 (as shown in Fig. 5 a and Fig. 5 b), for clamping, fix and handling forging part as shown in Figure 2, wherein the V-type opening angle is 90 ° (angle corresponding with the forging part contact position is complementary), to be conducive to clamping and fixed die forging; The inboard right bank angle of V-type is 3 ° (being that forging part also is tilted to the right 3 ° when Axial Thermal push), can prevent punch 1 when work and forging matrix face interferes phenomenon, and the while also is conducive to pick and place forging part; V-type right side fixed elevation is 10 ° (with 10 ° of inclined-planes of drift (3), fixedly the time, being complementary), to be conducive to the tightness with drift fine setting V-type movable clamping piece 2.
Drift 3 (as shown in Fig. 6 a and Fig. 6 b), the tightness coordinated with hot forging 6 for the V-type of front and back advance and retreat trace adjustment at any time movable clamping piece 2, when practical operation, general only 300/crowdes first 3 are clamped to adjustment, when the hot extrude casting die picks and places when smooth and easy, no longer clamp adjustment.
Pedestal 4 (as shown in Fig. 7 a and Fig. 7 b), for fixing, place or support V-type movable clamping piece 2, drift 3 and fixed support bar 5.
Fixed support bar 5 (as shown in Fig. 8 a and Fig. 8 b), in when work is fixed on the shrinkage pool of pedestal 4, fit fully in inclined-plane, upper end and inclined-plane, connecting pin forging part contact position, for supporting and the forging part lower recess of the fixing shaping of hot forging for the first time.
The course of work of hot extruding die of the present invention is as follows: at first, that the whole fixed installation of hot extruding die is complete and by punch 1 stuck-at-１ 600kN forcing press; Secondly, forging part hot forging for the first time obtained be heated to 1100 ℃～1150 ℃ be placed in V-type movable clamping piece 2 left sides and fixed support bar 5 on; Again, with drift 3 front and back advance and retreat fine setting activity orientation piece 2 right side tightness (only finely tune first 3 for general every batch, no longer finely tuned when the hot extrude casting die picks and places when smooth and easy); Finally, carry out axial single-ended localized heat extruding so that final the shaping in one stroke of press.
Claims (1)
1. a connecting pin hot forging and hot extrusion combined precision forming technology, comprise that hot forging for the first time is shaped and single-ended localized heat extruding precision form for the second time; Concrete steps are as follows:
1) hot forging for the first time is shaped: by radially hot forging of blank, can obtain and only have single-ended part 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) single-ended localized heat pushes precision form for the second time: the part that relies on hot extruding die also not reach micron order shape and dimensional requirement to the shaping of hot forging is for the first time carried out axial single-ended localized heat extruding precision form again, finally to reach single-ended part, only forges without draft angle and the recessed fillet of minimum transition
micron order shape and the dimensional requirement of mm.
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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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| CN103495687A true CN103495687A (en) | 2014-01-08 |
| CN103495687B 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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| CN103495687B (en) | 2015-10-07 |
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