CN106734797B - A kind of variable-section variable wall thickness axis of swaging is swaged the determination method of mold finishing segment length - Google Patents
A kind of variable-section variable wall thickness axis of swaging is swaged the determination method of mold finishing segment length Download PDFInfo
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- CN106734797B CN106734797B CN201611235442.XA CN201611235442A CN106734797B CN 106734797 B CN106734797 B CN 106734797B CN 201611235442 A CN201611235442 A CN 201611235442A CN 106734797 B CN106734797 B CN 106734797B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/008—Incremental forging
Abstract
Related variable-section variable wall thickness axis of swaging is swaged the determination method of mold finishing segment length according to the present invention, comprising the following steps: determines the position of the neutral surface in the rotary swaging process of shaft part containing plug；Establish the relationship that shaft part containing plug is swaged between mold finishing segment length and neutral surface position；Establish the relationship that shaft part containing plug is swaged between mold finishing segment length and power of swaging；Determine that shaft part containing plug is swaged mold Strain During Finishing Stage limiting length；Determine that shaft part containing plug is swaged mold Strain During Finishing Stage active length.Present invention combination car, which is swaged, axis product and swages feature, establish the relationship swaged between mold finishing segment length and neutral surface position, power of swaging containing plug, the variable-section variable wall thickness of proposition the swage determination method of mold finishing segment length of axis of swaging to the quality and performance for improving hollow shaft, and to swage hollow shaft mold design and the actual production containing plug there is important Technical Reference to be worth.
Description
Technical field
The invention belongs to machinery fields, and in particular to a kind of determination method of mold finishing segment length.
Background technique
Constant velocity shaft is an important composition component in automobile constant velocity Universal drive assembly.In one end and speed changer
Differential side gear be connected, the connection of the wheel hub of the other end and driving wheel, played in car driving process passing movement and
The effect of torque.
Swaging is referred to as swaged, and radial forging can also be called, and is a kind of for bar, tubing or wire rod Precision Machining
Rotoforming technique, belong to the scope of progressive molding and near-net-shape.
Swaging is that one kind is high-speed rotating simultaneously around blank axis by 2~4 pieces of forging dies, carries out high frequency forging to blank
It beats, to make the progressive molding method that blank axis sectional dimension reduces or shape changes.It swages and processes hollow shaft, the company of can be realized
Continuous radial direction forges, and the amount of feeding is small, compared with the forging that machining obtains, has preferable Forming Quality.In addition, using forging
Forming technique, shape and size can be controlled flexibly, can provide complex-shaped components blank, therefore, in the advanced of foreign countries
Technique of swaging is widely applied in car transmission shaft manufacture.Monoblock type car hollow shaft can be processed using technique of swaging, had
The features such as light weight degree is high, torsion stiffness is high and fatigue life is high.Technique of swaging can process monoblock type car hollow shaft,
Have the characteristics that light weight degree is high, torsion stiffness is high and fatigue life is high, for the car etc. of small size and receiving large torque
The manufacture of fast Universal drive jackshaft has an apparent advantage, therefore car constant-speed Universal drive jackshaft is swaged during technique can become
Between axis manufacture production development trend.
The middle section of car constant-speed universal drive shaft is swaged the equal wall thickness hollow shaft of technique formation using containing plug, is revolved
Reasonable technological parameter is the key that guarantee swage product quality and prevention defect in forging process.
But there are pits, surface for the car constant-speed universal drive shaft produced using current processing technology of swaging
The defects of folding, surface cracks, deviation from circular from, straightness error, excessive surface roughness.If forging desired size precision
It is higher, then mold finishing segment length of swaging must reasonably be designed, if mold Strain During Finishing Stage Design of length is unreasonable, Chang Hui
Cause hollow shaft to occur the defects of deviation from circular from, straightness error, excessive surface roughness in rotary swaging process, influences hollow shaft
Quality and performance.
Summary of the invention
The present invention is to carry out the axis, and it is an object of the present invention to provide a kind of variable-section variable wall thickness is swaged to solve the above-mentioned problems and revolve
The determination method of forging mould finishing segment length.
The present invention provides a kind of variable-section variable wall thickness axis of swaging to swage the determination method of mold finishing segment length, for
The axis of swaging of the shaft part containing plug is swaged in technique, the neutral surface position in the rotary swaging process for quality of swaging to influence and axis of swaging
Mold finishing segment length of swaging is determined characterized by comprising
Step 1, the position of the neutral surface in the rotary swaging process of shaft part containing plug is determined；
Step 2, the relationship that shaft part containing plug is swaged between mold finishing segment length and neutral surface position is established；
Step 3, the relationship that shaft part containing plug is swaged between mold finishing segment length and power of swaging is established；
Step 4, determine that shaft part containing plug is swaged mold Strain During Finishing Stage limiting length；
Step 5, determine that shaft part containing plug is swaged mold Strain During Finishing Stage active length.
It swages in the determination method that axis swages mold finishing segment length in variable-section variable wall thickness provided by the invention, it can be with
It has a feature in that wherein, in step 2, by any one method in economics analysis method, simulation method, experimental method come really
Fixed shaft part containing plug is swaged the relationship of mold finishing segment length and neutral surface position.
In addition, swage in the determination method that axis swages mold finishing segment length in variable-section variable wall thickness provided by the invention,
It can also have the following features: wherein, containing for plural kind of different finishing segment length chosen by simulation method respectively in step 2
Plug shaft part swages mold should by testing the relation line 1 of obtain swaging containing plug mold finishing segment length and neutral surface position
The function expression of relation line 1 are as follows: yy1=0.49x+15.02, y1For Y axis coordinate value corresponding to neutral surface, x is that unit is mm
Swage the value of mold finishing segment length containing plug.
In addition, swage in the determination method that axis swages mold finishing segment length in variable-section variable wall thickness provided by the invention,
It can also have the following features: wherein, in step 3, under conditions of the amount of feeding is swaged in setting containing plug, choose plural number respectively
The shaft part containing plug of kind different finishing segment length is swaged mold, by experiment obtain swaging containing plug mold finishing segment length and
Forge the relation line 2 between power, the function expression of the relation line 2 are as follows: yy2=16.46x-199.35, y2For the value for forging power,
X is that unit is swaging the value of mold finishing segment length containing plug for mm.
In addition, swage in the determination method that axis swages mold finishing segment length in variable-section variable wall thickness provided by the invention,
It can also have the following features: wherein, in step 4, choose identical blank material, swage the amount of feeding in setting containing plug
Under the conditions of, the shaft part containing plug for choosing plural kind of different finishing segment length respectively is swaged mold, obtains containing plug by experiment
The relation curve 3 of mold finishing segment length of swaging and axial tension stress, the expression formula of the relation line 3 are as follows: yy3=9.73 × 1010
×0.64x+ 477.12, y3It is the axial tension stress value of MPa for unit, x is that unit is swaging mold finishing segment length containing plug for mm
The value of degree.
In addition, swage in the determination method that axis swages mold finishing segment length in variable-section variable wall thickness provided by the invention,
It can also have the following features: wherein, according to relation line 3, it is long to obtain the Strain During Finishing Stage limit corresponding with blank material limiting value
Degree.
In addition, swage in the determination method that axis swages mold finishing segment length in variable-section variable wall thickness provided by the invention,
It can also have the following features: wherein, in step 5, the Strain During Finishing Stage active length is meets the relation line 1, institute simultaneously
It states relation line 2 and the relation line 3 and is less than the value of any one x of the Strain During Finishing Stage limiting length.
The action and effect of invention
Related variable-section variable wall thickness axis of swaging is swaged the determination method of mold finishing segment length according to the present invention, including
Following steps: the position of the neutral surface in the rotary swaging process of shaft part containing plug is determined；Shaft part containing plug is established to swage mold Strain During Finishing Stage
Relationship between length and neutral surface position；Establish the pass that shaft part containing plug is swaged between mold finishing segment length and power of swaging
System；Determine that shaft part containing plug is swaged mold Strain During Finishing Stage limiting length；It is produced in conjunction with face position, power of swaging and axis of swaging in swaging property
Product size determines that suitable shaft part containing plug is swaged mold finishing segment length.Present invention combination car, which is swaged, axis product and swages
Feature establishes the relationship swaged between mold finishing segment length and neutral surface position, power of swaging containing plug, the variable-section variable of proposition
Wall thickness swage axis swage mold finishing segment length determination method to improving the quality and performance of hollow shaft, and swage containing plug
There is important Technical Reference to be worth for hollow shaft mold design and actual production.
Detailed description of the invention
Fig. 1 is the schematic diagram of hollow shaft interlude before swaging in the embodiment of the present invention；
Fig. 2 is the hollow shaft section schematic diagram for becoming wall thickness variable cross-section in the embodiment of the present invention；
Fig. 3 is that shaft part containing plug is swaged the positional diagram of mold and blank in the embodiment of the present invention；
Fig. 4 is that the swage relation line of mold finishing segment length and neutral surface position containing plug is illustrated in the embodiment of the present invention
Figure；
Fig. 5 be in the embodiment of the present invention containing plug swage mold finishing segment length with forge the relation line schematic diagram of power；
And
Fig. 6 is that the swage relation line of mold finishing segment length and axial tension stress containing plug is illustrated in the embodiment of the present invention
Figure.
Specific embodiment
It is real below in order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention
Apply example combination attached drawing to variable-section variable wall thickness provided by the invention swage axis swage mold finishing segment length determination method work have
Body illustrates.
Embodiment
Step 1, the neutral surface position in the rotary swaging process of shaft part containing plug is determined.
The present embodiment is swaged by certain car for hollow shaft interlude, is swaged and is processed the blank that constant velocity universal jackshaft uses
For seamless steel pipe, as shown in Figure 1, material is steel alloy 25CrMo4, performance requirement of the product to blank material: tensile strength is most
Big 630MPa (target 600MPa), 86~100HRB of surface hardness (86~95HRB of target), 169~240HV5 of core hardness.It should
Billet size are as follows: outer diameter 37mm, wall thickness 5mm.
For convenience, axis of swaging is divided into according to the processing technology of product by three parts, as shown in Fig. 2, its shaft part 1,3
It is the hollow shaft section for becoming wall thickness variable cross-section, is swaged forming using no plug multi-pass；The prismatic hollow shafts of wall thickness such as shaft part 2 is
Section is swaged forming using single pass containing plug.
(1) it is swaged the feature of swaging of axis according to variable-section variable wall thickness car, determines and swage neutral surface position containing plug；
For the present embodiment, the rotary swaging process of the axis of swaging of variable-section variable wall thickness be broadly divided into no mandrel axis section 1 swage,
Shaft part containing plug 2 swages and three processes such as swages without mandrel axis section 3.
Process one, no mandrel axis section 1 are swaged, and rotary swaging process material flows primarily radial, axial metal flow
Seldom.
Process two, shaft part containing plug 2 are swaged, and rotary swaging process is a drawing process to material, middle metal of swaging
Flowing had not only generated Radial Flow but also the axial flowing of generation, was the key that influence the flow direction ginseng of metal by controlling mold shape
Number.Need to control the Main way of metal flow in 2 rotary swaging process of shaft part containing plug, because having swaged without mandrel axis section 1
At metal flows over the quality that more will affect product of swaging to 1 end of shaft part containing plug.
Process three, no mandrel axis section 3 are swaged, and rotary swaging process was swaged as the rotary swaging process of no mandrel axis section 1
Journey material flows primarily radial, and axial metal flow is seldom.
Shaft part containing plug 2 swage mold and blank detail location relationship as shown in figure 3, being swaged change according to mold and blank
The mold of swaging containing plug can be divided into three sections by metal flow relationship between shape, respectively sinking section I, forging stage II, finishing
Section III.Wherein the sinking section mainly blank material under the forging of mold moves radially, and internal-and external diameter reduces；Forging stage is material
Primary deformable section, the basic molded line of product is formed under the forging of mold and in conjunction with the effect of plug；Mold Strain During Finishing Stage portion
It is divided into calibration segment, blank further increases product circularity and surface quality by forging for Strain During Finishing Stage.
Neutral surface in rotary swaging process is the divisional plane of metal flow, and metal does not flow in neutral surface, neutral surface two sides
Flow direction is on the contrary, the position of neutral surface is to influence one of the important parameter of quality of swaging in rotary swaging process.For the present embodiment,
In order to guarantee quality of swaging, neutral surface position should be in mold Strain During Finishing Stage, and metal is given to blank end stream as far as possible when swaging in this way
It is dynamic, with the quality of the shaft part 1 for the completion that guarantees to have swaged.
When neutral surface is located at Strain During Finishing Stage, the metal flow rates at blank end are far longer than product end.According to variable-section variable
Wall thickness car swage axis swage feature and neutral surface position at material flow characteristics, neutral surface is better closer to product end, can
To reduce flowing of the material to product end, to avoid influencing the machined quality for crossing part.So neutral surface should be located at essence
In whole section III.
Step 2, the relationship that shaft part containing plug is swaged between mold finishing segment length and neutral surface position is established.
(2) relationship swaged between mold finishing segment length and neutral surface position containing plug is established.
Containing plug swage mold finishing segment length centering face position influence it is very big, in order to determine containing plug swage mold essence
Whole segment length needs to establish and swage the relationship of mold finishing segment length and neutral surface position containing plug, can pass through economics analysis
Method, simulation method, experimental method etc. are determined swages the relationship of mold finishing segment length and neutral surface position containing plug.
It is determined in this example by simulation method and is swaged the relationship of mold finishing segment length and neutral surface position containing plug.Respectively
The mold for choosing five kinds of 40mm, 45mm, 50mm, 55mm, 60mm different finishing segment length obtains mold Strain During Finishing Stage of swaging containing plug
Length and the relationship of neutral surface position are as shown in table 1:
Neutral surface position under the different finishing segment length of table 1
Using the data in table 1, obtain as shown in Figure 4 swaging mold finishing segment length and neutral surface position containing plug
Relation line 1.
According to the positional relationship line 1 of finishing segment length in Fig. 4 and neutral surface, finishing segment length and neutral surface position are fitted
Between functional relation such as formula (1) shown in
yy1=0.49x+15.02 (1)
In formula, y1For Y axis coordinate value corresponding to neutral surface, x is that unit is swaging mold finishing segment length containing plug for mm
The value of degree.
The simulation result of neutral surface position under different finishing segment length is also shown that the increase with finishing segment length, in
Property face position it is mobile to product end, by neutral surface position to the flow effect of material it is found that the increase of finishing segment length makes material
Increasing to the flowing at die entrance end, this is conducive to the quality for improving processing axis, so theoretically the longer the better for neutral surface, but
It will receive processing technology during axis actual processing of swaging and forge the limitation of power, so Strain During Finishing Stage can not be too long.
Step 3, the relationship that shaft part containing plug is swaged between mold finishing segment length and power of swaging is established.
(3) relationship swaged between mold finishing segment length and power of swaging containing plug is established.
Swage mold finishing segment length to determine containing plug, it is also necessary to establish containing plug swage mold finishing segment length with
Relationship between power of swaging.
Strain During Finishing Stage is the calibrated section of product, is mainly used to control the straight line of the final forming dimension of forging and calibration blank
Degree.From the point of view of the effect of Strain During Finishing Stage, the longer the better for Strain During Finishing Stage, but too long Strain During Finishing Stage increases the metal for participating in deforming, if also
Keep original amount of feeding, it is necessary to increase power of swaging, to will increase the load of machine.When Strain During Finishing Stage reduces, on the contrary,
With regard to needing to reduce power of swaging.If not reducing power of swaging, Strain During Finishing Stage is too short to will appear hammering and external waviness.
It is 2.42mm containing the amount of feeding that plug is swaged for the present embodiment, finishing segment length and forges the relationship between power
Line 2, as shown in Figure 5.
Different finishing segment length corresponds to the different power that forges as seen from Figure 5, and the two is substantially in a linear relationship, according to
Fig. 5 finishing segment length and the variation for forging power can fit finishing segment length and forge the functional relation such as formula (2) between power
It is shown
yy2=16.46x-199.35 (2)
In formula, y2For the value for forging power, x is that unit is swaging the value of mold finishing segment length containing plug for mm.
Finishing segment length and the relationship forged between power also show that Strain During Finishing Stage is shorter, and it is smaller radially to forge power, reduce finishing
The length of section, which advantageously reduces, forges power.
Step 4, determine that shaft part containing plug is swaged mold Strain During Finishing Stage limiting length.
(4) it is determined according to characteristic of material mechanics of swaging and is swaged mold Strain During Finishing Stage limiting length containing plug.
Mold finishing segment length is swaged also by the influence of material limits, because in blank rotary swaging process containing plug containing plug
Axial tension.If tensile stress is excessive, the defects of swaging crackle may cause.Therefore the segment length of finishing containing plug will be swaged
The stress constraint of shaft material.
Selected blank material is steel alloy 25CrMo4 in the present embodiment, and tensile strength is up to 630MPa (target
600MPa).The amount of feeding is swaged as 2.42mm containing plug in this example.Four kinds of different finishing segment length 45mm, 50mm, 55mm, 60mm
Under axial tension stress it is as shown in table 2:
Axial tension stress under the different finishing segment length of table 2
| Parameter | Mold 1 | Mold 2 | Mold 3 | Mold 4 |
| Finishing segment length L/mm | 45 | 50 | 55 | 60 |
| Axial tension stress/MPa | 232 | 440 | 469 | 483 |
By the relation line 3 of available the finishing segment length as shown in Figure 6 and axial tension stress of data in table 2.
According to the relation line 3 in Fig. 6.Functional relation during obtaining finishing segment length and forging between axial tension stress
As shown in formula (3)
yy3=9.73 × 1010×0.64x+477.12 (3)
In formula, y3It is the axial tension stress value of MPa for unit, x is that unit is swaging mold finishing segment length containing plug for mm
The value of degree.
By finishing segment length and axial tension stress relation line 3 it is found that when swaging containing plug, in the constant situation of other conditions
Under, with the increase of finishing segment length, corresponding axial stress is also increased with it.Its axis when finishing segment length reaches 60mm
Reach 483MPa to stress, in order to ensure axial tension stress cannot be excessive in rotary swaging process, practical finishing segment length is preferably little
In 55mm.
Step 5, determine that shaft part containing plug is swaged mold Strain During Finishing Stage active length.
(5) swage neutral surface position, power of swaging and axis product size of swaging are combined, determines suitable Strain During Finishing Stage work length
Degree.
In conjunction with the relationship swaged between mold finishing segment length and neutral surface position containing plug, swage mold finishing containing plug
Relationship between segment length and power of swaging and characteristic of material mechanics of swaging are determined swages mold Strain During Finishing Stage limiting length containing plug,
Can determine and swage mold Strain During Finishing Stage active length containing plug, the Strain During Finishing Stage active length be and meanwhile meet the relation line 1,
The value of the relation line 2 and the relation line 3 and any one x less than the Strain During Finishing Stage limiting length.
For the present embodiment, feature and swaged the surface of axis containing plug according to variable-section variable wall thickness car swaging for axis of swaging
Quality requirement determines neutral surface at Strain During Finishing Stage III；When finishing segment length is 45~55mm, forging power is 550~700KN, axis
It is 230~469MPa to tensile stress, material significantly improves to product end turnover rate, and it is relatively low that machine forges power, during forging
Axial tension stress is little, will not defect, so forging power and axial direction in rotary swaging process when finishing segment length is 45-55mm
Pulling force is suitable, and product quality can also significantly improve at this time；When finishing segment length is 55~60mm, power is forged greater than 700KN, axis
Also increasing to tensile stress is 469~483MPa, and it is larger that machine forges power, at this point, forging if blank material existing defects
Product can generate defect or latent defect because axial tension stress is excessive in the process, to reduce product quality.In addition, though smart
The whole bigger finishing effect of segment length is better, but finishing segment length also suffers from the restriction of product specific structure, can not be too long, no
Then influence product adds process.
The action and effect of embodiment
The axis of swaging of the variable-section variable wall thickness according to involved in the present embodiment is swaged the determination method of mold finishing segment length, packet
It includes following steps: determining the position of the neutral surface in the rotary swaging process of shaft part containing plug；Shaft part containing plug is established to swage mold finishing
Relationship between segment length and neutral surface position；Establish the pass that shaft part containing plug is swaged between mold finishing segment length and power of swaging
System；Determine that shaft part containing plug is swaged mold Strain During Finishing Stage limiting length；It is produced in conjunction with face position, power of swaging and axis of swaging in swaging property
Product size determines that suitable shaft part containing plug is swaged mold finishing segment length.The present embodiment combination car is swaged axis product and rotation
Feature is forged, the relationship swaged between mold finishing segment length and neutral surface position, power of swaging containing plug, the variable cross-section of proposition are established
Become wall thickness swage axis swage mold finishing segment length determination method to improve hollow shaft quality and performance, and containing plug revolve
Forging hollow shaft mold design and actual production, there is important Technical Reference to be worth.
In addition, the present embodiment obtains described swaging mold finishing segment length and the neutral surface containing plug by emulation experiment
The relation line 1 of position, convenient for determining the length come Strain During Finishing Stage according to neutral surface position.
Further, the present embodiment obtains described swage containing plug by experiment and mold finishing segment length and forges between power
Relation line 2, convenient for determining the length of Strain During Finishing Stage according to power is forged.
Further, the present embodiment obtains described swaging mold finishing segment length and axial tension stress containing plug by experiment
Relation curve 3, convenient for determining the length of Strain During Finishing Stage according to axial tension stress.
Above embodiment is preferred case of the invention, the protection scope being not intended to limit the invention.
Claims (7)
1. a kind of variable-section variable wall thickness is swaged, axis is swaged the determination method of mold finishing segment length, for the rotation in the shaft part containing plug
Forging axis is swaged in technique, and the neutral surface position and axis of swaging in the rotary swaging process for quality of swaging to influence are swaged mold Strain During Finishing Stage
Length is determined characterized by comprising
Step 1, the position of the neutral surface in the rotary swaging process of shaft part containing plug is determined；
Step 2, the relationship that shaft part containing plug is swaged between finishing segment length described in mold and the neutral surface position is established；
Step 3, the relationship that shaft part containing plug is swaged between finishing segment length and power of swaging described in mold is established；
Step 4, determine that shaft part containing plug is swaged mold Strain During Finishing Stage limiting length；
Step 5, determine that shaft part containing plug is swaged mold Strain During Finishing Stage active length.
2. variable-section variable wall thickness according to claim 1 is swaged, axis is swaged the determination method of mold finishing segment length, special
Sign is:
Wherein, it in step 2, is determined by any one method in economics analysis method, simulation method, experimental method described containing plug
Shaft part is swaged the relationship of mold finishing segment length and neutral surface position.
3. variable-section variable wall thickness according to claim 2 is swaged, axis is swaged the determination method of mold finishing segment length, special
Sign is:
Wherein, the shaft part containing plug for choosing plural kind of different finishing segment length in step 2 respectively by simulation method is swaged
Mold obtains the shaft part containing plug and swages the relation line 1 of mold finishing segment length and the neutral surface position by testing, this
The function expression of relation line 1 are as follows:
yy1=0.49x+15.02
y1For Y axis coordinate value corresponding to neutral surface, x is that unit is that the shaft part containing plug of mm is swaged the value of mold finishing segment length.
4. variable-section variable wall thickness according to claim 3 is swaged, axis is swaged the determination method of mold finishing segment length, special
Sign is:
Wherein, in step 3, under conditions of the amount of feeding is swaged in setting containing plug, plural kind of the different finishing is chosen respectively
The shaft part containing plug of segment length is swaged mold, by experiment obtain the shaft part containing plug swage mold finishing segment length and
Forge the relation line 2 between power, the function expression of the relation line 2 are as follows:
yy2=16.46x-199.35
y2For the value for forging power, x is that unit is that the shaft part containing plug of mm is swaged the value of mold finishing segment length.
5. variable-section variable wall thickness according to claim 4 is swaged, axis is swaged the determination method of mold finishing segment length, special
Sign is:
Wherein, in step 4, identical blank material is chosen, under conditions of the amount of feeding is swaged in setting containing plug, is chosen respectively multiple
The shaft part containing plug of several different finishing segment length is swaged mold, is obtained the shaft part containing plug by experiment and is revolved
The relation line 3 of forging mould finishing segment length and axial tension stress, the expression formula of the relation line 3 are as follows:
yy3=9.73 × 1010×0.64x+477.12
y3It is the axial tension stress value of MPa for unit, x is that unit is that the shaft part containing plug of mm is swaged the value of mold finishing segment length.
6. variable-section variable wall thickness according to claim 5 is swaged, axis is swaged the determination method of mold finishing segment length, special
Sign is:
Wherein, according to the relation line 3, Strain During Finishing Stage limiting length corresponding with the blank material limiting value is obtained.
7. variable-section variable wall thickness according to claim 6 is swaged, axis is swaged the determination method of mold finishing segment length, special
Sign is:
Wherein, in step 5, the Strain During Finishing Stage active length is while meeting the relation line 1, the relation line 2 and described
The value of relation line 3 and any one x less than the Strain During Finishing Stage limiting length.
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