CN101774410B - Method for producing automotive frame assembly - Google Patents
Method for producing automotive frame assembly Download PDFInfo
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- CN101774410B CN101774410B CN201010118309A CN201010118309A CN101774410B CN 101774410 B CN101774410 B CN 101774410B CN 201010118309 A CN201010118309 A CN 201010118309A CN 201010118309 A CN201010118309 A CN 201010118309A CN 101774410 B CN101774410 B CN 101774410B
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Abstract
The invention discloses a method for producing an automotive frame assembly, which comprises the following steps: forming each component of the automotive frame assembly (1), and forming preset holes on predetermined components; welding each component of the automotive frame assembly (1) into the automotive frame assembly (1) on a welding clamp; and forming mounting holes at the positions of the preset holes on the predetermined components. Due to the technical scheme of welding first and then forming the mounting holes, smaller preset holes are punched at the key mounting holes with higher requirement on precision on the frame, and the step of forming the mounting holes is performed on the preset hole after the welding of the whole frame is finished. Therefore, the influence on the precision of the mounting holes due to welding deformation is avoided, the dimension precision of a mounting hole of a lower arm of the frame, a mounting hole of a shaft pin of a leaf spring and the like is improved, and the assembly quality of a chassis is guaranteed.
Description
Technical field
The present invention relates to a kind of method for producing automotive frame assembly, particularly, relate to a kind of method for producing automotive frame assembly that carries out the mounting hole forming step on the vehicle frame manufacturing line that is included in.
Background technology
Automotive frame assembly generally comprises longeron, crossbeam and a plurality of mounting bracket.Said frame assembly is as the carrier that the car chassis parts are installed; Have a plurality of corresponding mounting brackets on it; The following swing arm mounting bracket that for example is used to install swing arm under the vehicle frame (this time swing arm belongs to the parts of automobile suspension system, all is called " swing arm under the vehicle frame " for describing below convenient) and the leaf spring mounting bracket that is used to install leaf springs of car (being steel spring) etc.Be formed with corresponding mounting hole (referring to Fig. 1 to Fig. 5) on these mounting brackets; To be used to install parts such as swing arm under the said vehicle frame, leaf springs of car; Certainly; On the frame assembly of different structure, some mounting holes also can be formed directly on the chassis side rail, the mounting hole that is used for mounting dampers that for example on chassis side rail, forms.As everyone knows, the dimensional accuracy of these mounting holes on the frame assembly and form accuracy are very important, and it relates to the road-holding property and the safety of automobile.For example, for the mounting hole of the leaf spring pivot pin of automobile, if the dimensional accuracy of mounting hole and form accuracy can't guarantee, then when the leaf spring pivot pin is installed, will be difficult to install.More seriously; If the mounting hole of the leaf spring pivot pin of automobile both sides forms to such an extent that obviously the left and right sides is asymmetric; The position of then in vehicle traveling process, installing owing to the leaf spring of automobile both sides is obviously inconsistent on automobile fore-and-aft direction or short transverse, therefore generation inclination even rollover easily.
But traditional method for producing automotive frame assembly is difficult to guarantee the dimensional accuracy and the form accuracy of these mounting holes.This mainly is because traditional automobile chassis frame working method self has apparent in view defective.Fig. 6 has shown the schematic flow sheet of traditional frame assembly working method; Generally speaking; The technological process that the working method of tradition frame assembly adopts earlier drawing fully to weld then; Wherein, in the parts forming step, each parts of frame assembly, especially corresponding mounting bracket are all through Sheet Metal Forming Technology be shaped fully (being that its size, mounting hole all are shaped fully); For example; The scheme drawing that shows swing arm first mounting bracket 2 under the vehicle frame among Fig. 7, as can be seen from the figure, following swing arm first mounting hole 8 on this time swing arm first mounting bracket 2 has formed final elongated hole shape (other vehicle frame parts such as leaf spring mounting bracket are drawing fully similarly all) in the parts forming step.Like this; In follow-up welding step; Because the main CO2 gas shield arc welding (CO2 weldering) that adopts of vehicle frame welding; There is bigger welding deformation in frame assembly after welding (mounting bracket at place, weld also can deform; Thereby make installation hole size, shape, the position be formed on the mounting bracket all obvious variation can take place), and the frame assembly aligning step generally can only proofread and correct tangible welding deformation (the for example obvious welding deformation of chassis side rail), and powerless for the local welding distortion of the mounting hole on the mounting bracket.Therefore; Under traditional frame optimization assembly working method; The relative size precision and the form accuracy of key mounting holes such as swing arm mounting hole, leaf spring mounting hole can not be guaranteed under the vehicle frame, thereby have influenced the assembly quality on chassis greatly, make the road-holding property variation of car load.
In addition; Also there is another defective in traditional frame optimization assembly working method; Promptly after the frame assembly welding was accomplished, can there be corresponding welding stress in each weld in the frame assembly, and these welding stresses can't discharge in a short time; But along with car production is accomplished and place in operation; Welding stress can discharge gradually, thereby can make some crucial welds (weld of the swing arm mounting bracket that for example is welded down) of frame assembly deform lentamente, this so that also can have influence on dimensional accuracy, form accuracy and the positional precision of mounting hole such as swing arm mounting hole, leaf spring mounting hole under the vehicle frame; Thereby in use make the degradation of automobile suspension system, steering swivel system etc., seriously undermined the road-holding property and the safety of automobile.
The defective of above-mentioned orthodox car frame assembly working method has had a strong impact on the overall performance of car chassis, and also becomes and relatively be difficult to the problem that solves in the method for producing automotive frame assembly.
Summary of the invention
Technical matters to be solved by this invention provides a kind of method for producing automotive frame assembly; This method for producing automotive frame assembly can avoid said mounting hole to receive the influence of frame assembly welding deformation at dimensional accuracy that guarantees the key mounting holes on the automobile chassis frame effectively and form accuracy.
The technical matters that the present invention further solves provides a kind of method for producing automotive frame assembly; This method for producing automotive frame assembly not only can avoid the key mounting holes on the vehicle frame to receive the influence of welding deformation; And can in the vehicle frame production process, eliminate the vehicle frame welding stress effectively; Thereby can more effectively guarantee the dimensional accuracy and the form accuracy of said key mounting holes, and prevent in said frame assembly use, to discharge the positional precision that influences said mounting hole because of welding stress.
For solving above-mentioned basic fundamental problem of the present invention; The present invention provides a kind of method for producing automotive frame assembly; Wherein, This method for producing automotive frame assembly comprises the steps: frame assembly parts forming step: form each parts of said automotive frame assembly, and form preset holes on the predetermined parts in these parts; Frame assembly welding step: each parts of said automotive frame assembly are welded into said automotive frame assembly; And frame assembly mounting hole forming step: the preset holes position on said predetermined parts forms the mounting hole of reservation shape and size.
For solving above-mentioned further technical matters of the present invention; Said method for producing automotive frame assembly also is included in the elimination welding stress step of carrying out before the said frame assembly mounting hole forming step, and this elimination welding stress step is through being heated to the weld that forms in the said frame assembly welding step the pairing A of material of this weld
C1After the heat treatment temperature, spray the phenol formaldehyde foam that is used to be incubated in this weld.
Because adopting to be welded earlier, the present invention forms the technical scheme of mounting hole again; In frame assembly parts forming step, corresponding mounting bracket also not exclusively is shaped; But the key mounting holes higher to some accuracy requirements (for example swing arm mounting hole, leaf spring pivot pin mounting hole etc. under the vehicle frame) forms less preset holes earlier; After whole vehicle frame welding is accomplished; Further carry out punching technology again forming the mounting hole of preliminary dimension and shape, thereby avoided influencing the precision of mounting hole, improved the dimensional accuracy and the form accuracy of swing arm mounting hole, leaf spring pivot pin mounting hole etc. under the vehicle frame for example because of welding deformation in the preset holes position; Guarantee the assembly quality on chassis, improved the road-holding property after the car load assembling is accomplished.
In addition; Through above-mentioned further optimized technical scheme of the present invention; Because this technical scheme comprises the Promethean step that eliminates stress that meets the destressing Principles of Heating Processing; Therefore can eliminate the welding stress in the frame assembly effectively, thereby can avoid frame assembly in use in the future, distortion slowly to take place, and have influence on dimensional accuracy, form accuracy and the positional precision of key mounting holes because of welding stress discharges; The quality of the frame assembly that therefore can guarantee effectively to be produced, and further improved the road-holding property and the safety of automobile.And this step that eliminates stress is unlike the destressing heat treatment needs of routine very long heat treatment time or the special equipment such as heat treatment heating furnace of needs, and it carries out on the vehicle frame manufacturing line fully; And after this step that eliminates stress is accomplished; Can carry out mounting hole forming step of the present invention subsequently, therefore can not have influence on the smoothness of automobile chassis frame production procedure, its cost is lower; Simple to operate, reliability is better.
Description of drawings
Below in conjunction with the specific embodiment of accompanying drawing detailed description frame assembly working method of the present invention, through describing in detail, above and other objects of the present invention, feature and advantage will be tangible:
Fig. 1 is the exemplary plot of frame assembly:
Fig. 2 is the enlarged diagram of the part A among Fig. 1;
Fig. 3 is the enlarged diagram of the part B among Fig. 1;
Fig. 4 is the enlarged diagram of the portion C among Fig. 1;
Fig. 5 is the enlarged diagram of the part D among Fig. 1;
Fig. 6 is the schematic flow sheet of traditional frame assembly working method;
Fig. 7 is the formed exemplary plot of the left front mounting bracket of swing arm down of the parts forming step of Fig. 6;
Fig. 8 is the schematic flow sheet of the frame assembly working method of the specific embodiment of the invention;
Fig. 9 is the exemplary plot of formed down swing arm first mounting bracket of the parts forming step of Fig. 8, the shape of following swing arm first mounting hole that long and two-short dash line is wherein represented in follow-up frame assembly mounting hole forming step, to form;
Figure 10 is the schematic side view of the frame assembly after accomplishing welding step on the welding jig;
Figure 11 is the plan sketch of the frame assembly after accomplishing welding step on the welding jig;
Figure 12 is the scheme drawing of the frame assembly mounting hole forming step of the preferred embodiment for the present invention, wherein for making figure succinctly clear, has omitted the clamping limb of welding jig;
Figure 13 is the enlarged diagram of the part E among Figure 12, the wherein clearer process of carrying out the mounting hole forming step through punch that at length shown;
Figure 14 is the schematic perspective view of the punch that adopted of the frame assembly mounting hole forming step of the preferred embodiment for the present invention; And
Figure 15 is the schematic side view of the punch that adopted of the frame assembly mounting hole forming step of the preferred embodiment for the present invention.
Description of reference numerals:
2 times swing arm first mounting brackets of 1 frame assembly
4 times swing arm the 3rd mounting brackets of 3 times swing arms, second mounting bracket
5 times swing arms the 4th mounting bracket, 6 back leaf spring bearing pin first mounting brackets
8 times swing arm first mounting holes of 7 back leaf spring bearing pin second mounting brackets
10 times swing arm the 3rd mounting holes of 9 times swing arms, second mounting hole
11 times swing arms the 4th mounting hole, 12 back leaf spring bearing pin first mounting holes
13 back leaf spring bearing pin second mounting hole 14 preset holes
The clamping limb of 15 welding jigs, 16 welding jigs
17 punch, 18 first punch
19 first dies, 20 second punch
21 the 3rd punch, 22 second dies
23 the 4th punch, 24 first driving cylinders
25 second driving cylinders, 26 guide rails
27 bearings, 28 waste material exhaust tubes
29 waste material boxes
The specific embodiment
Before setting forth preferred implementation of the present invention, need to prove, hereinafter; For describing convenient more employed nouns of locality, like " left side ", " right side ", " preceding ", " back " etc., its implication all is the orientation according to institute's ordinary representation after the auto assembly moulding; For example, in Fig. 1, after this frame assembly 1 is assembled into automobile; Part A among the figure and portion C promptly are in the left side of automobile, the right side that part B among the figure and part D then are in automobile; Part A and part B are in the front portion of automobile, and portion C and part D then are in the rear portion of automobile, and relation can the rest may be inferred for the position between other corresponding component.In addition, alleged " swing arm under the vehicle frame " of the present invention is the parts of automobile suspension system, and D score wherein representes that it is installed in the below of vehicle frame.
Automotive frame assembly generally comprises longeron, crossbeam and a plurality of mounting bracket.Referring to figs. 1 through Fig. 5; Wherein Fig. 1 shows the exemplary plot of frame assembly 1; Fig. 2 to Fig. 5 has then shown some crucial mounting brackets and the enlarged diagram of mounting hole thereof on the frame assembly among Fig. 1, and wherein, Fig. 2 shows first mounting bracket 2 and following swing arm second mounting bracket 3 of swing arm down; Be formed with swing arm first mounting hole 8 down on swing arm first mounting bracket 2 down; Be formed with swing arm second mounting hole 9 down on swing arm second mounting bracket 3 down, this time swing arm first mounting bracket 2 and following swing arm second mounting bracket 3 are positioned at the left side of frame assembly 1 front portion, and swing arm second mounting bracket 2 is positioned at the place ahead of swing arm second mounting bracket 3 down down.In addition; In Fig. 2 to Fig. 4 respectively enlarged and displayed time swing arm the 3rd mounting bracket 4, swing arm the 4th mounting bracket 5, back leaf spring bearing pin first mounting bracket 6 and back leaf spring second mounting bracket 7 down; Wherein descend swing arm the 3rd mounting bracket 4 and following swing arm the 4th mounting bracket 5 respectively with following swing arm first mounting bracket 1 and the following swing arm second mounting bracket 2 left and right symmetries; Then 6 of leaf spring bearing pin first mounting brackets and afterwards leaf spring second mounting bracket 7 left and right symmetries; Correspondingly; Be formed with swing arm the 3rd mounting hole 10 down on swing arm the 3rd mounting bracket 4 down; Be formed with swing arm the 4th mounting hole 11 down on following swing arm the 4th mounting bracket 5, on back leaf spring first mounting bracket 6 and back leaf spring second mounting bracket 7, then be formed with back leaf spring bearing pin first mounting hole 12 and back leaf spring bearing pin second mounting hole 13 that are used to install the leaf spring bearing pin respectively.Known ground; Above-mentioned mounting hole relates to the setting accuracy of parts such as automobile suspension system, steering swivel system; Therefore its dimensional accuracy and form accuracy are extremely important, have only the precision of abundant these key mounting holes of assurance, could guarantee road-holding property and safety behind the car load assembled formation.
Need to prove at this; Frame assembly 1 shown in Fig. 1 to Fig. 5 and some above-mentioned crucial mounting holes only are the example structure of giving an example for the purpose of illustration; The frame assembly of different automobile types has the certain structure difference in the actual production practice, for example, and on the frame assembly of different structure; Some mounting holes also can be formed directly on the chassis side rail, the mounting hole that is used for mounting dampers that for example on chassis side rail, forms.But method for producing automotive frame assembly of the present invention is applicable to the production of various different frame assemblys 1, and the essence design of its technical scheme has general applicability, and is not limited to the frame assembly of ad hoc structure shown in Fig. 1 to Fig. 5.
As shown in Figure 8, the basic technical scheme of frame assembly working method of the present invention comprises the steps: the forming step of frame assembly parts; The frame assembly welding step; And frame assembly mounting hole forming step.
Specifically describe each step of the frame assembly working method of basic technical scheme of the present invention below in conjunction with Fig. 9 to Figure 15.Be the invention main points of outstanding basic technical scheme of the present invention, to some with traditional frame assembly working method in similar step only carry out simple explanation, and do not describe in detail.In addition, when each basic step is described, will according to circumstances carry out additional disclosure to some preferred steps.
The forming step of frame assembly parts mainly shapes each parts of frame assembly; The parts of frame assembly generally all are steel plateelements; Therefore mainly be to form, for example the steel plate punching press be bent into cross member of frame and each mounting bracket etc. that grooved longeron, punching press form reservation shape and size, still through process for stamping; The forming step of frame assembly parts also is not limited to the employing process for stamping; Can also adopt other various suitable methods, for example, through formation chassis side raiies such as Forging Technology, rolling mill practices, process corresponding mounting bracket etc. through welding method.Different with traditional frame assembly working method is; In this parts forming step, need be formed with the mounting bracket of key mounting holes to some, this forming step is when being shaped these mounting brackets; Mounting hole on it and incomplete be shaped (for example punching press) are put in place; But only form preset holes 14, and this preset holes 14 is mainly used in the formation position that indicates the mounting hole in the follow-up frame assembly mounting hole forming step, and its size is significantly less than the mounting hole of final shaping.For example; At following swing arm first mounting bracket 2 that parts forming step of the present invention forms that passes through shown in Figure 9; Following swing arm first mounting bracket in the punching press shape of this time swing arm first mounting bracket 2 and the traditional vehicle frame working method shown in Figure 7 is basic identical; But on this following swing arm shown in Figure 9 first mounting bracket 2, only be formed with preset holes 14, do not form final required oval slotted hole (among Fig. 9 with shown in the long and two-short dash line).
" branch unit welding step " shown in Fig. 8 belongs to the selection step under a kind of optimal way; After it mainly is welded into corresponding vehicle frame branch unit with each parts of said automotive frame assembly in advance; And then each said vehicle frame branch unit is carried out general assembly weld on said welding jig 15; Therefore this branch unit welding step in fact also can be considered to be included in the preferred steps in the frame assembly welding step; When selecting this branch unit welding step; Can with vehicle frame left side longeron with and on mounting bracket be welded in advance vehicle frame left side longeron branch unit, with the vehicle frame right vertical beam and on mounting bracket be welded into vehicle frame right vertical beam branch unit in advance; In addition, each crossbeam with and on mounting bracket etc. also can be welded into corresponding crossbeam branch unit in advance, the crossbeam that swing arm first mounting bracket 2 and following swing arm the 3rd mounting bracket 4 for example are installed down among Fig. 1 can form a crossbeam branch unit; And then, on welding jig 15, vehicle frame left side longeron branch unit, vehicle frame right vertical beam branch unit and each crossbeam assembly are welded into complete frame assembly 1.
Certainly; Do not carrying out under the situation of branch unit welding step in advance; Like Figure 10 and shown in Figure 11, can on welding jig 15, directly carry out the welding step of frame assembly 1, generally be that the clamping limb 16 through welding jig is clamped to the left and right longerons of vehicle frame on the welding jig 15 earlier; Directly carry out the welding of each crossbeam, mounting bracket then, form frame assembly 1 thereby be welded.
The frame assembly aligning step is the preferred steps of frame assembly working method of the present invention, and it mainly is that the obvious distortion of the frame assembly after the welding is forced to proofread and correct, and for example proofreaies and correct the obvious welding deformation of chassis side rail.Certainly, under the situation that does not have obvious welding deformation, this frame assembly aligning step can not carry out yet.This frame assembly aligning step is identical with traditional frame assembly working method, generally is to proofread and correct through the method (for example compression machine etc.) of exerting pressure, thereby makes vehicle frame meet predetermined dimensional characteristic on the whole.
Preferably,, the frame assembly aligning step carries out elimination welding stress step of the present invention (in the schematic flow sheet of Fig. 8, not showing) after carrying out.
As everyone knows; Can there be corresponding welding stress in frame assembly 1 after welding; This welding stress can't discharge in a short time, but along with car production is accomplished and place in operation, welding stress can discharge gradually; Thereby can make some crucial welds (the for example weld of swing arm mounting bracket under the vehicle frame) of vehicle frame deform slowly; This can have influence on dimensional accuracy, form accuracy and the positional precision of key mounting holes such as swing arm mounting hole, leaf spring mounting hole under the vehicle frame, thereby in use makes the degradation of automobile suspension system, steering swivel system etc., has seriously undermined the road-holding property and the safety of automobile.But the known heat treatment method of eliminating welding stress is general all to need the long processing time, and needs between special heat treatment heating or heating furnace.This is not suitable for the vehicle frame working method with strict production operation time; If adopt these known heat treatment methods; The inevitable prolongation greatly of the residence time of frame assembly on manufacturing line; For example eliminating stress through the natrual ageing heat treatment method generally needs the time of several weeks, and this can badly influence the normal production procedure of vehicle frame.
For eliminating the welding stress that frame assembly 1 welding produces; The present invention adopts the step of special removal welding stress; Because the welding stress that forms in the frame assembly welding step mainly concentrates on corresponding weld; (Ac1 is a general-duty heat treatment temperature symbol to the pairing Ac1 heat treatment temperature of material (parts of frame assembly are steel basically) of this weld with these weld patterned heats in the present invention for this reason; The material that the position is heat-treated in expression begins to produce the pairing temperature of Ao Shi soma); When the material with each weld (especially being welded with the crucial weld of important mounting bracket) was heated to the Ac1 heat treatment temperature, the steel inside of weld began to take place the even diffusion phenomena of formula body difficult to understand, thereby can discharge the in-to-in welding stress; This moment is the locally sprayed phenol formaldehyde foam that is used to be incubated in each weld; Thereby make the weld in the long relatively time, remain in the heat-treatment temperature range that to eliminate welding stress, therefore make Ao Shi soma evenly spread and continue to carry out, thereby can eliminate welding stress relatively effectively.Wherein, said phenol formaldehyde foam resistance to effect of heat is better, and it can bear 1700 ℃ instantaneous temperature peak value, and can play insulation effect preferably, thereby makes the release of welding stress continue to carry out.In addition, the patterned heat to the weld can adopt acetylene bright eruption rifle instruments such as (being similar to the acetylene cutting gun) to carry out.
And then, carry out the mounting hole forming step of frame assembly working method of the present invention.
Extremely shown in Figure 13 like Figure 12 (for making drawing clear; Omitted the clamping limb 16 of welding jig 15 among Figure 12); In optimal way of the present invention, (swing arm mounting bracket 2,3 under the vehicle frame for example shown in Figure 1 at the predetermined parts of frame assembly 1 to adopt punch 17; 4,5) go up punching press and form mounting hole.The concrete structure of punch 17 such as Figure 14 and shown in Figure 15; This punch 17 comprises first punch 18, first die 19, second punch 20, the 3rd punch 21, second die 22 and the 4th punch 23; Wherein, First die 19 is between first punch 18 and second punch 20; Second die 22 is separated with spacing between respectively between first die 19 and first punch 18 and second punch 20 between the 3rd punch 21 and the 4th punch 23, also be separated with spacing between respectively between second die 22 and the 3rd punch 21 and the 4th punch 23.When carrying out the punching press of mounting hole; For example; In Figure 13; This punch 17 is carrying out the drawing of following swing arm second mounting hole 9 on following swing arm first mounting hole 8 and following swing arm second mounting bracket 3 on following swing arm shown in Figure 1 first mounting bracket 2; This moment, down two flange (being formed with preset holes 14 on it) of swing arm first mounting bracket 2 extend between first punch 18 and first die 19 respectively and between second punch 20 and first die 19; Two flange of contiguous following swing arm second mounting bracket 3 then extend between the 3rd punch 21 and second die 22 respectively and between the 4th punch 23 and second die 22; When first driving cylinder 24 and second driving cylinder 25 drove, first punch 18 and second punch 20 were pressed to first die 19 from both sides at the guide rail 26 of punch 17 simultaneously like this, thereby the position corresponding to preset holes 14 forms swing arm first mounting hole 8 down on two flange of swing arm first mounting bracket 2 down.Similarly, following swing arm second mounting hole 9 on following swing arm second mounting bracket 3 also forms through second die 22, the 3rd punch 21 and the 4th punch 23 in an identical manner.In addition, the waste material of punching generation is discharged in the waste material box 19 that is installed on the bearing 27 through waste material exhaust tube 28.
Need to prove that Figure 14 and punch 17 shown in Figure 15 only are a kind of exemplary structures, in this ad hoc structure; First die 19 and second die 22 all can two-sidedly use, and promptly this first die 19 and second die 22 all can be used as the die use corresponding to the face of corresponding punch, selectively; Also can adopt and four punch 18,20,21; 23 corresponding four independent dies, this only is a kind of simple modification, it belongs to scope of the present invention equally.In addition, each punch and die can carry out dismounting and change, to select mould to carry out drawing to the mounting hole of difformity and size.
Similarly, other mounting bracket (for example the leaf spring bearing pin mounting hole 12,13 on the leaf spring bearing pin mounting bracket 6,7, the mounting hole (not shown) on the suspension trailing arm mounting bracket etc.) all can carry out drawing through the punch of this type.Be formed directly under the situation of chassis side rail in some key mounting holes (the for example bearing pin mounting hole of shock absorber), should form in the grooved opening that can extend into chassis side rail for example towards the punch of empty machine 17 or die.But the shaping of the mounting hole that these are crucial also necessarily forms through above-mentioned punch 17 punching presses, and it can adopt various appropriate method to be shaped, and for example passes through horizontal borer etc., and the dimensional accuracy and the positional precision that only need to guarantee these mounting holes get final product.Basic fundamental design of the present invention is: after the frame assembly welding step, carry out the shaping of above-mentioned key mounting holes, make its influence that can not receive welding deformation, therefore above-mentioned mounting hole can form through multiple suitable mode.
In addition; Need to prove; Form preset holes 14 in the forming step of frame assembly parts of the present invention and be mainly used in the position that indicates the formation mounting hole; The final installation hole size that forms is greater than preset holes 14, and this mounting hole forms in the position corresponding to preset holes 14 and preset holes 14 is eliminated.The distortion displacement of trace also can take place in the position of preset holes 14 in above-mentioned welding process; But; This generally can not form obvious influence to the positional precision of the mounting hole of final formation; Welding deformation mainly can form considerable influence to the shape and size of preset holes 14, and the present invention is through the processing step arrangement of the mounting hole of welding postforming earlier for this reason, makes the dimensional accuracy of mounting hole and the influence that form accuracy can not be welded.Certainly; When reality forms mounting hole; In order more accurately to guarantee the positional precision of mounting hole, preferably also can carry out certain measurement update work, like this after forming mounting hole; The dimensional accuracy and the form accuracy of mounting hole not only can be fully guaranteed, the positional precision of these mounting holes can also be further guaranteed.Thereby; For traditional frame optimization assembly working method, owing to traditional frame assembly working method is shaped mounting hole before welding step fully, therefore after welding; Not only can can't guarantee the dimensional accuracy and the form accuracy of mounting hole because of welding deformation; And the position of these key mounting holes can not be adjusted according to the welding deformation situation, so positional precision also can't be further improved, and with regard to frame assembly working method of the present invention; Because the above-mentioned process step arrangement of technology of the present invention; It not only can fully guarantee the dimensional accuracy and the form accuracy of mounting hole, and can therefore can also further improve the positional precision of mounting hole with respect to traditional handicraft according to the formation position of welding deformation situation adjustment mounting hole under preferred situation because after the welding.
After frame assembly mounting hole forming step is accomplished; Because each weld at frame assembly 1 has sprayed the phenol formaldehyde foam that is used to be incubated under the situation of above-mentioned optimal technical scheme; This moment, the welding stress of corresponding weld was eliminated basically, and the temperature of weld also has been cooled to normal temperature basically (although exist phenol formaldehyde foam to be incubated after the mounting hole forming step is accomplished; But the weld still can be through the parts conduction heat of vehicle frame; Just decrease of temperature is slower), at this moment, remove the phenol formaldehyde foam of weld spraying; With the aesthetic property of assurance frame assembly 1, and make frame assembly 1 be suitable for carrying out following frame assembly spraying step.
In addition, frame assembly among Fig. 8 spraying step is a preferred steps, and it is the final decoration step after frame assembly 1 assembling is accomplished, and generally is spray paint on frame assembly 1, preventing the parts corrosion of frame assembly, and guarantees the aesthetic property of frame assembly 1.
Can find out through foregoing description; Method for producing automotive frame assembly of the present invention adopts to be welded earlier and forms the technical scheme of mounting hole again; Not exclusively drawing of parts (for example corresponding mounting bracket) to being scheduled in vehicle frame parts forming step; But stamp out less preset holes earlier in key mounting holes higher on these parts (for example swing arm mounting hole, leaf spring pivot pin mounting hole etc. under the vehicle frame) to some accuracy requirements; After whole vehicle frame welding is accomplished, further preset holes is carried out the mounting hole forming step again, to form the mounting hole of preliminary dimension and shape; Thereby avoided influencing the precision of mounting hole because of welding deformation; Improve the dimensional accuracy and the positional precision of swing arm mounting hole and leaf spring pivot pin mounting hole etc. under the vehicle frame for example, guaranteed the assembly quality on chassis, and improved the road-holding property after the car load assembling is accomplished.
In addition; In the further preferred version of the present invention through the Promethean step that eliminates stress that meets the destressing Principles of Heating Processing; Can eliminate the welding stress in the frame assembly effectively; Thereby can avoid frame assembly in use in the future, distortion slowly to take place, and have influence on dimensional accuracy, form accuracy and the positional precision of key mounting holes, therefore further guarantee the road-holding property and the safety of automobile because of welding stress discharges.In addition, this step that eliminates stress is unlike the destressing heat treatment needs of routine very long heat treatment time or the special equipment such as heat treatment furnace of needs, and it carries out on the vehicle frame manufacturing line fully; And after this step that eliminates stress is accomplished; Can carry out mounting hole forming step of the present invention subsequently, and can not have influence on the smoothness of automobile chassis frame production procedure, its cost is lower; Simple to operate, reliability is better.
More than combine accompanying drawing to describe the specific embodiment of method for producing automotive frame assembly of the present invention; But the present invention is not limited to the above-mentioned specific embodiment; In technical conceive scope of the present invention, can carry out various simple modification; For example welding jig 15 can be different from the ad hoc structure that shows among Figure 10 and Figure 11, the driving cylinder of punch 17 can also adopt air cylinder or the like; These simple variant all belong to protection scope of the present invention, and protection scope of the present invention should be limited claim.
Claims (10)
1. method for producing automotive frame assembly, wherein, this method for producing automotive frame assembly in turn includes the following steps:
Frame assembly parts forming step: form each parts of said automotive frame assembly (1), and form preset holes (14) on the predetermined parts in these each parts;
Frame assembly welding step: each parts of said automotive frame assembly (1) are welded into said automotive frame assembly (1); And
Frame assembly mounting hole forming step: preset holes (14) position on said predetermined parts forms the mounting hole (8,9,10,11,12,13) of reservation shape and size.
2. method for producing automotive frame assembly according to claim 1; Wherein, This method for producing automotive frame assembly also is included in the elimination welding stress step of carrying out before the said frame assembly mounting hole forming step, and this elimination welding stress step is through being heated to the weld that forms in the said frame assembly welding step the pairing A of material of this weld
C1After the heat treatment temperature, spray the phenol formaldehyde foam that is used to be incubated in this weld.
3. according to the said method for producing automotive frame assembly of claim 2, wherein, this method for producing automotive frame assembly also is included in the step of the said phenol formaldehyde foam of removal that carries out after the said frame assembly mounting hole forming step.
4. according to the said method for producing automotive frame assembly of claim 1; Wherein, This method for producing automotive frame assembly also is included in after the said frame assembly welding step and the frame assembly aligning step that before said frame assembly mounting hole forming step, carries out, and this aligning step is proofreaied and correct the welding deformation of said automotive frame assembly (1) through the method for exerting pressure.
5. according to the said method for producing automotive frame assembly of claim 1, wherein, this method for producing automotive frame assembly also comprises the step of the frame assembly spray paint that carries out at last.
6. according to the said method for producing automotive frame assembly of claim 1; Wherein, Said frame assembly welding step is included in after each parts with said automotive frame assembly (1) are welded into corresponding vehicle frame branch unit in advance, again each said vehicle frame branch unit is carried out the general assembly welding on welding jig (15).
7. method for producing automotive frame assembly according to claim 6, wherein, said vehicle frame branch unit comprises vehicle frame left side longeron assembly, vehicle frame right vertical beam assembly and each crossbeam assembly.
8. method for producing automotive frame assembly according to claim 1, wherein, said predetermined parts comprise swing arm mounting bracket under chassis side rail, the vehicle frame (2,3,4,5) and leaf springs of car pivot pin mounting bracket (6,7).
9. method for producing automotive frame assembly according to claim 8, wherein, said mounting hole comprises swing arm mounting hole under the vehicle frame (8,9,10,11) and leaf springs of car pivot pin mounting hole (12,13).
10. each described method for producing automotive frame assembly in requiring according to aforesaid right, wherein, said frame assembly mounting hole forming step is carried out the drawing of said mounting hole through punching machine (15), and this punching machine (15) comprises punch (18,20; 21,23), die (19,22) and driving cylinder (24,25); Said predetermined parts are positioned at said punch (18,20,21,23) and said die (19 when punching press; 22) between, said punch (18,20,21; 23) ((19,22) are so that form said mounting hole on the said predetermined parts under the driving of said driving cylinder (24,35), to press to said die.
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| CN201010118309A CN101774410B (en) | 2010-03-04 | 2010-03-04 | Method for producing automotive frame assembly |
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| CN201010118309A CN101774410B (en) | 2010-03-04 | 2010-03-04 | Method for producing automotive frame assembly |
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| CN101774410B true CN101774410B (en) | 2012-10-24 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102179636B (en) * | 2011-04-11 | 2013-10-23 | 湖南江麓特种装备制造有限公司 | Assembly welding method of chassis assembly and assembly welding tooling clamping devices special for same |
| CN103317003A (en) * | 2013-06-07 | 2013-09-25 | 广东福迪汽车有限公司 | Method for improving punching accuracy of frame and device |
| CN103286467B (en) * | 2013-06-24 | 2016-08-24 | 合肥长安汽车有限公司 | A kind of welding method controlling frame assembly deformation |
| CN103303393B (en) * | 2013-06-25 | 2016-08-10 | 东风汽车公司 | The assembling localization method of double cross arm independent suspension structure frame assembly |
| CN107486648A (en) * | 2016-09-21 | 2017-12-19 | 宝沃汽车（中国）有限公司 | One kind lengthens vehicle frame manufacture method and corresponding lengthening vehicle frame and vehicle |
| CN109158474B (en) * | 2018-09-07 | 2019-07-02 | 扬州宏运车业有限公司 | A kind of high-precision punching apparatus |
| CN113618347B (en) * | 2021-09-08 | 2023-06-16 | 枣庄群鑫金属制造股份有限公司 | Automobile chassis processing method |
| CN114770000A (en) * | 2022-05-06 | 2022-07-22 | 杭州富宏叉车制动器有限公司 | Processing technology and processing equipment for brake shoe |
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