CN106424510B - The design method of lorry axle roll forging roll forging mold - Google Patents
The design method of lorry axle roll forging roll forging mold Download PDFInfo
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- CN106424510B CN106424510B CN201610916114.XA CN201610916114A CN106424510B CN 106424510 B CN106424510 B CN 106424510B CN 201610916114 A CN201610916114 A CN 201610916114A CN 106424510 B CN106424510 B CN 106424510B
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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
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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Abstract
The present invention discloses a kind of design method of lorry axle roll forging roll forging mold, its technique formed only with roll forging without die forging, the present invention is only useful in D1600mm forging roll and greater than using on D1600mm forging roll, at the maximum distortion of the practical nip angle of roll forging at the half of blank, i.e., separated among blank.After one end is first carried out four-pass roll forging, then fall the excessive carry out four-pass roll forging to the other end, four-pass roll forging before turning around and after turning around four-pass roll forging be same deputy roller forging mould roll-forging process；The present invention devises the roll forging die enabling that the size that stock of square side length is 300mm is big, and the lorry axle of weight weight can not enough be completed due to the die-filling width of D1500mm forging roll on D1500mm forging roll；Curved, the off-axis phenomenon of prior art generation are avoided, this not only improves the production efficiency of lorry axle, also changes roll forging part metallic character significantly, improves bearing capacity.
Description
Technical field
One kind does not need especially in entire forging process for the molding roll forging die enabling of lorry axle roll forging
Die forging and only with four-pass roll forging stings entry position and turn around roll forging and same pair by the selection in centre during roll forging
The Roll Forging Die Design method that mold uses twice.
Background technique
Railway freight industry actively pushes forward heavily loaded speed-raising in recent years, to alleviate the deficiency of railway carrying capacity.And railway goods
Vehicle axle is the most important component of goods train vehicle running gear, subjects the self weight and load of vehicle, in train operation and
Also subject to impact force and brake force when parking, stress condition is with regard to increasingly complex in the state of high speed and heavy duty, while for peace
Consideration on complete, there is more stringent technical requirements to lorry axle.Therefore in addition to being filled on raw material and heat treatment after forging
Dispensing meaning guarantees to meet outside its technical requirements, and lorry axle has to pass through rolling and forging plasticity twice in moulding process
Deformation process, to reach the dual purpose of molding to its mechanical property of required shape and raising.
There are mainly two types of the forging technologies of current existing lorry axle: the first is free forging process, and equipment is logical
Common hydraulic press, such as original in the industry axle forging technique or pull-down forging hydraulic press, the flat-die hammer forging technology of early stage
It is seldom used, this production efficiency is extremely low, and labor intensity is very big, is almost eliminated；Second of technique is radial forging
(or finish forge) technique is made, equipment usually selects the radial forging of large-sized numerical control, and representative is radial forging finish forge work
Skill.
Defect existing for both existing techniques: 1) lorry axle is in forging process, it is desirable that operation machine jaw
It should remain and forge that axis is concentric and servo-actuated, guarantee that the axle of forging does not generate bending.The operation machine that original uses is in forging process
Middle no up and down action, therefore curved, the off-axis quantity generated in producing is more.2) press machine be old-fashioned three beams, four rod structure, four
Column stress is difficult equilibrium.Since " water attack " phenomenon causes the pressure piping of body often to be pulled apart, while pipe leakage is also caused, needed
Emulsion is largely supplemented, in order to maintain continuous production, emergency is supplemented without the tap water of Over emulsfication sometimes, leads to hydraulic tube
Road heavy corrosion, and cause the vicious circle for leaking and supplementing tap water.3) due to raw water press to moved cross beam drafts without
Control means have to be closed to guarantee that forging axis radial dimension by upper/lower die in supply to guarantee to forge axis radial dimension,
Forging axis during upper/lower die be frequently closed to guarantee that forging axis radial dimension, forge axis during upper/lower die be frequently closed and
The fatal problem caused: when the load born of moment hydraulic press of mold closure is ultimate load, cause host lower margin loose
Dynamic, body generates serious shaking, and these problems have seriously affected the normal production of axle.
The present invention is lorry axle roll forging roll forging die design method, in second half section roll forging and then is fallen
Head carrys out roll forging front half section, and is with same deputy roller forging mould with the second half section, this is than not only reducing mould in general roll-forging process
Have cost, and play the role of simplified roll-forging process, and is improved the bearing capacity for carrying position；Present invention use side
Expect roll forging, solve the deformation at carrying position, changes the structure and structure property at carrying position, enhance bearing capacity；This hair
The bright defect for not only overcoming above-mentioned traditional handicraft, also reduction labour personnel, mechanization production easy to accomplish not only improve labour
Efficiency, also saving labour cost.
Require bearing capacity strong since the weight of lorry axle itself is very heavy and length is again especially long, carries position
The features such as, documentation yet there are no only with roll-forging process for the forging technology of lorry axle and record.
Summary of the invention
The present invention relates to one kind to be used for the molding Roll Forging Die Design of lorry axle roll forging, wherein forging entirely
It being formed and using four roll forging die enablings only with roll forging without die-forging forming in journey, lorry axle uses square blank,
Mouth (4) at maximum distortion is actually bitten during roll forging and is selected in blank middle position, is bitten since the middle position, first
The second half section of stock of square carries out four-pass roll forging by first, second, third road, the 4th mold；Four mold
It is also used to the other half progress four-pass roll forging to excessive stock of square is fallen, and the front half section of roll forging part and second half section are each
Corresponding equal length in passage roll forging.
1=25.6 ° of angle [alpha] of first of roll forging die enabling effective deformation of the interlude x of lorry axle, the carrying of lorry axle
1=18.2 ° of angle beta of first of roll forging die enabling effective deformation of position 1；First of roll forging before the interlude x of lorry axle turns around
The length L1-1=309.6mm of part, first of roll forging parts with length L2-1=227mm before carrying position 1 is turned around.
2=33.5 ° of angle [alpha] of the second roll forging die enabling effective deformation of the interlude x of lorry axle, the carrying of lorry axle
2=22.9 ° of angle beta of the second roll forging die enabling effective deformation at position 1；Second roll forging before the interlude x of lorry axle turns around
The length L1-2=387.7mm of part, second roll forging parts with length L2-2=284.2mm before carrying position 1 is turned around.
3=37.2 ° of angle [alpha] of the third road roll forging die enabling effective deformation of the interlude x of lorry axle, the carrying of lorry axle
3=22.9 ° of angle beta of the third road roll forging die enabling effective deformation at position 1；Third road roll forging before the interlude x of lorry axle turns around
The length L1-3=471.6mm of part, third road roll forging parts with length L2-3=284.2mm before carrying position 1 is turned around.
4=44.3 ° of angle [alpha] of the 4th roll forging die enabling effective deformation of the interlude x of lorry axle, the carrying of lorry axle
4=22.9 ° of angle beta of the 4th roll forging die enabling effective deformation at position 1；4th roll forging before the interlude x of lorry axle turns around
The length L1-4=558.1mm of part, the 4th roll forging parts with length L2-4=284.2mm before carrying position 1 is turned around.
The length L ' of first of roll forging part after the interlude x of lorry axle turns around1-1=L1-1, the carrying position of lorry axle
1 turn around after first of roll forging part length L '2-1=L2-1, first of roll forging parts with length L ' after cantilever end 00 turns around3-1=L3-1；
The length L ' of second roll forging part after the interlude x of lorry axle turns around1-2=L1-2, the carrying position of lorry axle
1 turn around after second roll forging part length L '2-2=L2-2, second roll forging parts with length L ' after cantilever end 00 turns around3-2=L3-2；
The length L ' of third road roll forging part after the interlude x of lorry axle turns around1-3=L1-3, the carrying position of lorry axle
1 turn around after third road roll forging part length L '2-3=L2-3, third road roll forging parts with length L ' after cantilever end 00 turns around3-3=L3-3；
The length L ' of 4th roll forging part after the interlude x of lorry axle turns around1-4=L1-4, the carrying position of lorry axle
1 turn around after the 4th roll forging part length L '2-4=L2-4, the 4th roll forging parts with length L ' after cantilever end 00 turns around3-4=L3-4。
Detailed description of the invention
Fig. 1 is the blanking figure before lorry axle roll forging；
Fig. 2 is the blanking section A-A figure before lorry axle roll forging；
Fig. 3 is the main view for first of roll forging die enabling that lorry axle turns around before roll forging；
Fig. 4 is the left view for first of roll forging die enabling that lorry axle turns around before roll forging；
Fig. 5 is first of roll forging part that lorry axle turns around before roll forging；
Fig. 6 is the main view for the second roll forging die enabling that lorry axle turns around before roll forging；
Fig. 7 is the left view for the second roll forging die enabling that lorry axle turns around before roll forging；
Fig. 8 is the second roll forging part that lorry axle turns around before roll forging；
Fig. 9 is the main view for the third road roll forging die enabling that lorry axle turns around before roll forging；
Figure 10 is the left view for the third road roll forging die enabling that lorry axle turns around before roll forging；
Figure 11 is the third road roll forging part that lorry axle turns around before roll forging；
Figure 12 is the main view for the 4th roll forging die enabling that lorry axle turns around before roll forging；
Figure 13 is the left view for the 4th roll forging die enabling that lorry axle turns around before roll forging；
Figure 14 is the 4th roll forging part that lorry axle turns around before roll forging；
Figure 15 is first of roll forging part that lorry axle turns around after roll forging；
Figure 16 is the second roll forging part that lorry axle turns around after roll forging；
Figure 17 is the third road roll forging part that lorry axle turns around after roll forging；
Figure 18 is the 4th roll forging part that lorry axle turns around after roll forging；
Specific embodiment
Illustrating as 11 ' and 11 be the object of the symmetrical same size, L ' in the present embodiment2-1It is pair with L2-1
Claim size, L '1-1With L1-1It is symmetrical size etc..
Fig. 1 is the blank size before lorry axle roll forging, since the present invention uses stock of square roll forging, is actually bitten
4 selection is more crucial at mouth maximum distortion, this guarantees that same deputy roller forging mould utilizes twice, and mold is saved in roll-forging process
Cost, while playing the role of simplified roll-forging process, and the bearing capacity at carrying position can be improved, it actually bites in the present invention
4 are selected in blank middle position at mouth maximum distortion；Label 5 is front half section and the forging roll machine before roll forging of turning around of blank
The clamping end of tool hand, label 6 are the clamping ends of second half section and the forging roll manipulator after turning around of blank；Label 5 and mark
Numbers 6 be actually to bite at mouthful maximum distortion 4 and be divided into front half section 5 and second half section 6 for line of demarcation.Fig. 2 is cuing open for Fig. 1 section A-A
Face figure, L are square side length, and L=300mm.
Fig. 3 is the main view for first of roll forging die enabling that lorry axle turns around before roll forging, and the L0 in figure is forging roller
Center is away from and L0=1600mm；11 ' be first of roll forging upper mold, 11 first of roll forging lower die；M is upper and lower mould die parting line, and γ is
The angle of roll forging fanlike die block, and γ=115 °；α1It is first of roll forging die enabling effective deformation angle of the interlude x of lorry axle
Degree, β1It is first of roll forging die enabling effective deformation angle at the carrying position 1 of lorry axle；Wherein angle [alpha]1=25.6 °, α1?
Corresponding length is L in Fig. 51-1, L1-1For lorry axle interlude x turn around before first of roll forging part length, and L1-1=
309.6mm；Angle beta1=18.2 °, β1Corresponding length is L in Fig. 52-1, L2-1First of roll forging before turning around for carrying position 1
Part length, and L2-1=227mm；The L in Fig. 53-1It is the end of roll forging part, and L3-1=115.2mm.
Fig. 4 is the left view for first of roll forging die enabling that lorry axle turns around before roll forging, and L1 and L4 are seam allowance rulers
It is very little, L1=L4=1320mm；L3 is roller diameter, L3=1100mm；L5 is module width, L5=540mm；L2 is seam allowance groove
Depth, L2=15mm.
Fig. 5 is first of roll forging part that lorry axle turns around before roll forging；L1-1It is the interlude x (figure of lorry axle
18) length before roll forging of turning around after first of roll forging, length are equal to axle interlude x the two of first of roll forging length
/ mono-；L2-1It is length of the carrying position 1 of lorry axle before roll forging of turning around after first of roll forging, L3-1For lorry axle
Length of the cantilever end 00 before roll forging of turning around after first of roll forging.
Fig. 6 is the main view for the second roll forging die enabling that lorry axle turns around before roll forging；L0 in figure is forging roller
Center is away from and L0=1600mm；22 ' be second roll forging upper mold, 22 second roll forging lower dies；M is upper and lower mould die parting line, and γ is
The angle of roll forging fanlike die block, and γ=115 °；α2It is the second roll forging die enabling effective deformation angle of the interlude x of lorry axle
Degree, β2It is the second roll forging die enabling effective deformation angle at the carrying position 1 of lorry axle；Wherein angle [alpha]2=33.5 °, α2?
Corresponding length is L in Fig. 81-2, L1-2For lorry axle interlude x turn around before second roll forging part length, and L1-2=
387.7mm；Angle beta2=22.9 °, β2Corresponding length is L in fig. 82-2, L2-2Second roll forging before turning around for carrying position 1
Part length, and L2-2=284.2mm；L in fig. 83-2It is the end of roll forging part, and L3-2=149.7mm.
Fig. 7 is the left view for the second roll forging die enabling that lorry axle turns around before roll forging；L1, L2, L3 in figure,
L4, L5 are such as Fig. 4.
Fig. 8 is the second roll forging part that lorry axle turns around before roll forging；L1-2 is the interlude x of lorry axle
The length of (Figure 18) before roll forging of turning around after second roll forging, length are equal to axle interlude x in second roll forging length
Half；L2-2 is length of the carrying position 1 of lorry axle before roll forging of turning around after second roll forging, and L3-2 is goods
Length of the cantilever end 00 of vehicle axle before roll forging of turning around after second roll forging.
Fig. 9 is the main view for the third road roll forging die enabling that lorry axle turns around before roll forging；L0 in figure is forging roller
Center is away from and L0=1600mm；33 ' be third road roll forging upper mold, 33 third road roll forging lower dies；M is upper and lower mould die parting line, and γ is
The angle of roll forging fanlike die block, and γ=115 °；α3It is the third road roll forging die enabling effective deformation angle of the interlude x of lorry axle
Degree, β3It is the third road roll forging die enabling effective deformation angle at the carrying position 1 of lorry axle；Wherein angle [alpha]3=37.2 °, α3?
Corresponding length is L in Figure 111-3, L1-3For lorry axle interlude x turn around before third road roll forging part length, and L1-3=
471.6mm；Angle beta3=22.9 °, β3Corresponding length is L in Figure 112-3, L2-3Third road roller before turning around for carrying position 1
Forging length, and L2-3=284.2mm；The L in Figure 113-3It is the end of roll forging part, L3-3=194.6mm.
Figure 10 is the left view for the third road roll forging die enabling that lorry axle turns around before roll forging；L1, L2 in figure,
L3, L4, L5 are such as Fig. 4.
Figure 11 is the third road roll forging part that lorry axle turns around before roll forging；L1-3 is the interlude x of lorry axle
The length of (Figure 18) before roll forging of turning around after the roll forging of third road, length are equal to axle interlude x in third road roll forging length
Half；L2-3 is length of the carrying position 1 of lorry axle before roll forging of turning around after the roll forging of third road, and L3-3 is goods
Length of the cantilever end 00 of vehicle axle before roll forging of turning around after the roll forging of third road.
Figure 12 is the main view for the 4th roll forging die enabling that lorry axle turns around before roll forging；L0 in figure is forging roller
Center is away from and L0=1600mm；44 ' be the 4th roll forging upper mold, 44 third road roll forging lower dies；M is upper and lower mould die parting line, and γ is
The angle of roll forging fanlike die block, and γ=115 °；α4It is the 4th roll forging die enabling effective deformation angle of the interlude x of lorry axle
Degree, β4It is the 4th roll forging die enabling effective deformation angle at the carrying position 1 of lorry axle；Wherein angle [alpha]4=37.2 °, α4?
Corresponding length is L in Figure 141-4, L1-4For lorry axle interlude x turn around before the 4th roll forging part length, and L1-4=
471.6mm；Angle beta4=22.9 °, β4Corresponding length is L in Figure 142-4, L2-44th roller before turning around for carrying position 1
Forging length, and L2-4=284.2mm；The L in Figure 143-4It is the end of roll forging part, L3-4=233.5mm.
Figure 13 is the left view for the 4th roll forging die enabling that lorry axle turns around before roll forging；L1, L2 in figure,
L3, L4, L5 are such as Fig. 4.
Figure 14 is the 4th roll forging part that lorry axle turns around before roll forging；L1-4 is the interlude x of lorry axle
The length of (Figure 18) before roll forging of turning around after the 4th roll forging, length are equal to axle interlude x in the 4th roll forging length
Half；L2-4 is length of the carrying position 1 of lorry axle before roll forging of turning around after the 4th roll forging, and L3-4 is goods
Length of the cantilever end 00 of vehicle axle before roll forging of turning around after the 4th roll forging.
Figure 15 is first of roll forging part that lorry axle turns around after roll forging；L′1-1It is in first of forge rolling die of Fig. 3
Effective deformation angle [alpha]1Corresponding length, the i.e. length of first of roll forging part after the interlude x of lorry axle turns around, and L '1-1=
L1-1；L′2-1Be lorry axle carrying position 1 after roll forging of turning around the effective deformation angle beta in Fig. 31Corresponding length, i.e.,
The length of first of roll forging part after the carrying position 1 of lorry axle is turned around, and L '2-1=L2-1；L′3-1For the cantilever of lorry axle
First of roll forging parts with length and L ' after length of the end 00 after first of roll forging after roll forging of turning around, i.e. cantilever end 00 turn around3-1=
L3-1。
Figure 16 is the second roll forging part that lorry axle turns around after roll forging；L′1-2It is in Fig. 6 second forge rolling die
Effective deformation angle [alpha]2Corresponding length, the i.e. length of second roll forging part after the interlude x of lorry axle turns around, and L '1-2=
L1-2；L′2-2Be lorry axle carrying position 1 after roll forging of turning around the effective deformation angle beta in Fig. 62Corresponding length, i.e.,
The length of second roll forging part after the carrying position 1 of lorry axle is turned around, and L '2-2=L2-2；L′3-2For the cantilever of lorry axle
Second roll forging parts with length after length of the end 00 after second roll forging after roll forging of turning around, i.e. cantilever end 00 turn around, and L '3-2
=L3-2。
Figure 17 is the third road roll forging part that lorry axle turns around after roll forging；L′1-3It is in Fig. 9 third road forge rolling die
Effective deformation angle [alpha]3Corresponding length, the i.e. length of third road roll forging part after the interlude x of lorry axle turns around, and L '1-3=
L1-3；L′2-3Be lorry axle carrying position 1 after roll forging of turning around the effective deformation angle beta in Fig. 93Corresponding length, i.e.,
The length of third road roll forging part after the carrying position 1 of lorry axle is turned around, and L '2-3=L2-3；L′3-3For the cantilever of lorry axle
Third road roll forging parts with length after length of the end 00 after third road roll forging after roll forging of turning around, i.e. cantilever end 00 turn around, L '3-3=
L3-3。
Figure 18 is the 4th roll forging part that lorry axle turns around after roll forging；L′1-4It is in the 4th forge rolling die of Figure 12
Effective deformation angle [alpha]4Corresponding length, the i.e. length of first of roll forging part after the interlude x of lorry axle turns around, and L '1-4=
L1-4；L′2-4Be lorry axle carrying position 1 after roll forging of turning around the effective deformation angle beta in Figure 123Corresponding length,
That is the length of the 4th roll forging part after the carrying position 1 of lorry axle is turned around, and L '2-4=L2-4；L′3-4For the outstanding of lorry axle
4th roll forging parts with length after length of the arm end 00 after the 4th roll forging after roll forging of turning around, i.e. cantilever end 00 turn around, and
L′3-4=L3-4。
In summary, the present invention provides one kind for the molding Roll Forging Die Design side of lorry axle roll forging
Method, compared with prior art, lorry axle breach the constraint of open die forging and radial forging defect and enter roll-forging process
Semi-automatic forging technology, the characteristics of this mold design is that this roll forging is to bite mouth to bite in middle position and with same pair
Roll forging die enabling turns around the Roll Forging Die Design method of roll forging.
The foregoing is merely presently preferred embodiments of the present invention, and all changes made with the claims in the present invention all should belong to
The range that the present invention is covered.
Claims (6)
1. a kind of design method for lorry axle roll forging roll forging mold, wherein only being adopted in entire forging process
It is formed with roll forging and using four roll forging die enablings without die-forging forming, lorry axle uses square blank, in roll forging process
The middle mouth (4) at maximum distortion that actually bites is selected in blank middle position, bites since the middle position, first stock of square
Second half section by first, second, third road, the 4th mold carry out four-pass roll forging；Four mold is also used to pair
Fall the other half progress four-pass roll forging of excessive stock of square, and the front half section of roll forging part and second half section are in each passage roll forging
In corresponding equal length.
2. the method as described in claim 1, which is characterized in that first of roll forging die enabling of the interlude x of lorry axle is effective
Deformation angle α 1=25.6 °, first of roll forging die enabling effective deformation angle beta 1=at the carrying position (1) of lorry axle
18.2°；The length L1-1=309.6mm of first of roll forging part before the interlude x of lorry axle turns around, carrying position (1) are fallen
First of roll forging parts with length L2-1=227mm before head.
3. the method as described in claim 1, which is characterized in that the second roll forging die enabling of the interlude x of lorry axle is effective
Deformation angle α 2=33.5 °, the second roll forging die enabling effective deformation angle beta 2=at the carrying position (1) of lorry axle
22.9°；The length L1-2=387.7mm of second roll forging part before the interlude x of lorry axle turns around, carrying position (1) are fallen
Second roll forging parts with length L2-2=284.2mm before head.
4. the method as described in claim 1, which is characterized in that the third road roll forging die enabling of the interlude x of lorry axle is effective
Deformation angle α 3=37.2 °, the third road roll forging die enabling effective deformation angle beta 3=at the carrying position (1) of lorry axle
22.9°；The length L1-3=471.6mm of third road roll forging part before the interlude x of lorry axle turns around, carrying position (1) are fallen
Third road roll forging parts with length L2-3=284.2mm before head.
5. the method as described in claim 1, which is characterized in that the 4th roll forging die enabling of the interlude x of lorry axle is effective
Deformation angle α 4=44.3 °, the 4th roll forging die enabling effective deformation angle beta 4=at the carrying position (1) of lorry axle
22.9°；The length L1-4=558.1mm of 4th roll forging part before the interlude x of lorry axle turns around, carrying position (1) are fallen
4th roll forging parts with length L2-4=284.2mm before head.
6. the method as described in claim 1, which is characterized in that the front half section of roll forging part and second half section are right in each passage roll forging
The equal length answered, the length L ' of first of roll forging part after the interlude x of lorry axle turns around1-1=L1-1, lorry axle holds
Carry the length L ' of first of roll forging part after position (1) turns around2-1=L2-1, first of roll forging part is long after cantilever end (00) turns around
Spend L '3-1=L3-1；
The length L ' of second roll forging part after the interlude x of lorry axle turns around1-2=L1-2, the carrying position (1) of lorry axle
The length L ' of second roll forging part after turning around2-2=L2-2, second roll forging parts with length L ' after cantilever end (00) turns around3-2=
L3-2；
The length L ' of third road roll forging part after the interlude x of lorry axle turns around1-3=L1-3, the carrying position (1) of lorry axle
The length L ' of third road roll forging part after turning around2-3=L2-3, third road roll forging parts with length L ' after cantilever end (00) turns around3-3=
L3-3；
The length L ' of 4th roll forging part after the interlude x of lorry axle turns around1-4=L1-4, the carrying position (1) of lorry axle
The length L ' of 4th roll forging part after turning around2-4=L2-4, the 4th roll forging parts with length L ' after cantilever end (00) turns around3-4=
L3-4。
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| CN201610916114.XA CN106424510B (en) | 2016-10-21 | 2016-10-21 | The design method of lorry axle roll forging roll forging mold |
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| CN201610916114.XA CN106424510B (en) | 2016-10-21 | 2016-10-21 | The design method of lorry axle roll forging roll forging mold |
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| DE102017116570B4 (en) * | 2017-03-22 | 2019-01-17 | Sms Group Gmbh | Stretching and stretching mill |
| CN107225150B (en) * | 2017-07-21 | 2019-12-03 | 泰安市瑞朗科技有限公司 | A kind of processing method of variable cross-section track connecting plate |
| CN113751647A (en) * | 2021-08-25 | 2021-12-07 | 第一拖拉机股份有限公司 | Closed clamping and pressing die and closed clamping and pressing method for die forging blank |
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| CN101549384A (en) * | 2009-02-18 | 2009-10-07 | 北京机电研究所 | Roll forging technology for producing roll forging parts with length exceeding maximum permissible length of roll forging machine |
| CN201519735U (en) * | 2009-05-12 | 2010-07-07 | 北京机电研究所 | roll forging die enabling support arm to achieve bending on roll forging machine |
| CN102430678A (en) * | 2011-11-08 | 2012-05-02 | 北京机电研究所 | Roll forging method for series toothed rail forgings of coal mining machine |
| CN202984551U (en) * | 2012-09-03 | 2013-06-12 | 北京机电研究所 | Roll forging mould for solid forging hand brake pull rod of rail wagon |
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| CN102274921B (en) * | 2011-05-13 | 2013-04-17 | 北京机电研究所 | Method for forming train shaft forgings |
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| US5592847A (en) * | 1993-12-17 | 1997-01-14 | Wyman-Gordon Company | Stepped segmented, closed-die forging |
| CN101549384A (en) * | 2009-02-18 | 2009-10-07 | 北京机电研究所 | Roll forging technology for producing roll forging parts with length exceeding maximum permissible length of roll forging machine |
| CN201519735U (en) * | 2009-05-12 | 2010-07-07 | 北京机电研究所 | roll forging die enabling support arm to achieve bending on roll forging machine |
| CN102430678A (en) * | 2011-11-08 | 2012-05-02 | 北京机电研究所 | Roll forging method for series toothed rail forgings of coal mining machine |
| CN202984551U (en) * | 2012-09-03 | 2013-06-12 | 北京机电研究所 | Roll forging mould for solid forging hand brake pull rod of rail wagon |
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