CN113899275A - Front subframe mounting stud precision gauge and application method thereof - Google Patents
Front subframe mounting stud precision gauge and application method thereof Download PDFInfo
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- CN113899275A CN113899275A CN202110730381.9A CN202110730381A CN113899275A CN 113899275 A CN113899275 A CN 113899275A CN 202110730381 A CN202110730381 A CN 202110730381A CN 113899275 A CN113899275 A CN 113899275A
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- mounting stud
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0025—Measuring of vehicle parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/245—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing perpendicularity
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Abstract
The invention discloses a front subframe mounting stud precision gauge which comprises a mounting stud precision gauge base and a detection assembly, wherein the detection assembly comprises a slide rail mounting seat fixed on the mounting stud precision gauge base, a slide rail fixed on the slide rail mounting seat, an upper slide block arranged on the slide rail in a sliding mode, an upper detection sleeve fixed on the upper slide block, a lower slide block arranged on the slide rail in a sliding mode and a lower detection sleeve fixed on the lower slide block, the length direction of the slide rail is along the vertical direction, the upper slide block is positioned on the upper side of the lower slide block, the inner diameter of the upper detection sleeve is larger than that of the lower detection sleeve, the position degree and the verticality of a mounting stud of a subframe can be detected, and the structure is simple. The invention also discloses a use method of the front subframe installation stud precision gauge, the detection process is rapid, and the production can be effectively guided according to different measurement results.
Description
Technical Field
The invention relates to an automobile chassis, in particular to a front auxiliary frame mounting stud precision gauge and a use method thereof.
Background
The auxiliary frame assembly 2 is taken as an important component of the whole vehicle and closely related to the performance and the function of the whole vehicle, the verticality and the position accuracy of the mounting stud 1 of the front auxiliary frame on the vehicle body assembly also influence one of the performance and the function factor of the chassis, and unqualified verticality and position accuracy of the mounting stud not only influence the assembly rhythm and the difficulty degree of the assembly, but also can cause abnormal sound of the auxiliary frame assembly 2 and the chassis control performance.
As shown in fig. 1, the front subframe mounting stud 1 comprises a front subframe mounting surface 11 and a nut mounting surface 12 arranged on the lower side of the front subframe mounting surface 11, and a bushing of the subframe assembly 2 is matched with the front subframe mounting surface 11 and then tightened by a nut to realize the connection and fixation of the subframe assembly 2 and the front subframe mounting stud 1, so that the perpendicularity and the position degree of the front subframe mounting stud 1 must be qualified, and the subframe assembly 2 can be normally assembled. The outer diameter of the subframe mounting section is larger than that of a nut assembling surface 12, for example, the inner diameter of a bushing of a subframe assembly 2 is phi 17mm, the outer diameter of the subframe mounting section can be phi 16mm, the nut assembling surface 12 can be connected with an M14 nut, the existing verticality and position degree detection mode of a front subframe mounting stud 1 is that the front subframe mounting stud 1 is connected with a cabin boundary beam sub-assembly 4 through a detection assembling clamp, then the cabin boundary beam sub-assembly 4 is positioned through a cabin boundary beam detection tool assembly, and finally the front subframe mounting stud 1 is detected through a front subframe mounting stud 1 detection module arranged on the cabin boundary beam detection tool assembly, as shown in figure 2, most of the existing front subframe mounting stud detection modules detect the nut assembling surface 12 with M14 threads through a phi 15 perpendicularity sleeve 3 to judge whether the front subframe mounting stud 1 meets the requirements or not, therefore, whether the perpendicularity of the nut assembling surface 12 and the position degree of the front sub frame installing surface 11 meet the requirements or not is judged. The verticality of a nut assembling surface 12 of a front sub-frame mounting stud 1 requires phi 0.5mm, the position degree of a front sub-frame mounting surface 11 requires phi 1.0mm, the sub-frame assembly 2 is matched with the front sub-frame mounting surface 11, the front sub-frame mounting surface 11 is positioned on the upper side of the nut assembling surface 12, and the length of the front sub-frame mounting stud 1 is greater than 80mm (can be 82.2 mm), when the verticality of the nut assembling surface 12 and the position degree of the front sub-frame mounting surface 11 are qualified but the deviation directions are consistent, the detection mode of slightly deviating can cause unqualified phenomena, but the front sub-frame mounting stud 1 has no problem during actual loading, so that whether the verticality and the position degree of the nut assembling surface 12 are qualified or not can be judged by adopting the mode, and qualified parts can be difficult to deliver to qualified parts by suppliers; when the precision is indeed unqualified, the detection mode cannot judge whether the unqualified reason is that the position degree of the front subframe installation surface 11 is unqualified or the verticality of the nut assembly surface 12 is unqualified, so that a supplier cannot effectively guide the precision debugging direction through the detection result. Meanwhile, the detection mode can also lead a host factory to judge that the verticality and the position degree of the front auxiliary frame mounting stud 1 are not qualified once the auxiliary frame assembly 2 is difficult to assemble, and the root cause of the auxiliary frame assembly 2 difficult to assemble is seriously influenced by an engineer, so that the rectification and modification period is longer and the rectification and modification efficiency is low.
CN204388761U discloses a position accuracy detection device of sub vehicle frame location tubular column, includes: the fixing surface of the fixing plate is parallel to the welding surface of the auxiliary frame positioning column tube; the first detection pin is of a stepped structure and abuts against the auxiliary frame positioning column pipe; the stepped sleeve is sleeved outside the first detection pin, and the end face of the large-diameter section of the stepped sleeve abuts against the fixed plate; the connecting plate comprises a first plate and a second plate perpendicular to the first plate, and the second plate is connected with the fixing plate; and the second detection pin penetrates through the top end of the first plate. The utility model discloses a position accuracy detection device of sub vehicle frame location tubular column on measuring the basis that sub vehicle frame location tubular column hangs down straightness, detects the round pin and leans on with sub vehicle frame bottom surface counterbalance through the second that sets up on the connecting plate that is connected with the deflector, measures the position accuracy of sub vehicle frame location tubular column Z direction. This is, of course, a useful attempt in the art.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art and provide the front subframe mounting stud precision gauge which can detect the position degree and the perpendicularity of the subframe mounting stud and has a simple structure; the invention also provides a use method of the front subframe installation stud precision gauge, the detection process is fast and convenient, production can be effectively guided according to different measurement results, and problem analysis can be rapidly carried out.
The invention discloses a front subframe mounting stud precision gauge which comprises a mounting stud precision gauge base and a detection assembly, wherein the detection assembly comprises a slide rail mounting seat fixed on the mounting stud precision gauge base, a slide rail fixed on the slide rail mounting seat, an upper sliding block arranged on the slide rail in a sliding mode, an upper detection sleeve fixed on the upper sliding block, a lower sliding block arranged on the slide rail in a sliding mode and a lower detection sleeve fixed on the lower sliding block, the length direction of the slide rail is along the vertical direction, the upper sliding block is positioned on the upper side of the lower sliding block, and the inner diameter of the upper detection sleeve is larger than that of the lower detection sleeve.
Further, the detection assembly further comprises an upper limiting block used for preventing the upper sliding block from sliding out upwards and a lower limiting block used for preventing the lower sliding block from sliding out downwards, the upper limiting block is arranged on the upper side of the sliding rail, and the lower limiting block is arranged on the lower side of the sliding rail.
Furthermore, the inner diameter of the upper detection sleeve is phi 17mm, and the inner diameter of the lower detection sleeve is phi 15.4 mm.
Further, the upper detection sleeve is coaxial with the lower detection sleeve.
The invention also provides a use method of the auxiliary frame mounting stud precision gauge, which comprises the following steps:
s1, preparation procedure before detection;
the front subframe mounting stud comprises a front subframe mounting surface and a nut mounting surface arranged on the lower side of the front subframe mounting surface, the outer diameter of the front subframe mounting surface is phi 16mm, and the nominal diameter of a thread of the nut mounting surface is M14 mm; connecting a front auxiliary frame mounting stud with the cabin boundary beam sub-assembly through a detection assembly fixture, positioning the cabin boundary beam sub-assembly through a cabin boundary beam detection tool assembly, fixing a mounting stud precision detection tool base on the cabin boundary beam detection tool assembly through a bolt, and enabling the position of the front auxiliary frame mounting stud on the cabin boundary beam sub-assembly to correspond to the position of the detection assembly;
s2, sliding the upper detection sleeve upwards;
if the upper detection sleeve cannot pass through the nut assembly surface, the out-of-tolerance of the position degree and the verticality of the nut assembly surface is serious, the deviation of the position degree of the nut assembly surface is larger than phi 3mm, the connection state of the front subframe mounting stud and the cabin edge beam sub-assembly needs to be released through the detection assembly fixture, the mounting position of the front subframe mounting stud is determined again, and the step S1 is returned;
if the upper detection sleeve can pass through the nut mounting surface, performing step S3;
s3, continuously sliding the upper detection sleeve upwards;
when the upper sliding block abuts against the upper limiting block, the upper detection sleeve is sleeved on the mounting surface of the front auxiliary frame; if the upper sliding block cannot move upwards until the upper sliding block abuts against the upper limiting block, the position degree of the mounting surface of the front subframe is unqualified, the position degree deviation of the mounting surface of the front subframe is larger than phi 1mm, the upper detection sleeve needs to slide out of the mounting stud of the front subframe downwards, then the connection state of the mounting stud of the front subframe and the cabin edge beam sub-assembly is released through the detection assembly clamp, the mounting position of the mounting stud of the front subframe is determined again, then the mounting stud of the front subframe is connected with the cabin edge beam sub-assembly through the detection assembly clamp, and the step returns to the step S1;
if the upper sliding block can move upwards until abutting against the upper limiting block, and the position degree of the mounting surface of the front subframe meets the requirement, performing step S4;
s4, sliding the lower detection sleeve upwards;
if the lower detection sleeve can be sleeved on the nut assembling surface from bottom to top, the verticality of the nut assembling surface meets the requirement, so that the position degree and the verticality of the mounting stud of the front auxiliary frame are qualified;
if the lower detection sleeve cannot be sleeved on the nut assembling surface from bottom to top, the positional deviation of the nut assembling surface is larger than phi 1.4mm, and the out-of-tolerance possibly occurs in the perpendicularity indirectly reflecting the mounting stud of the front auxiliary frame, the step S5 is carried out;
s5, perpendicularity out-of-tolerance analysis;
measuring the relative position of the mounting surface of the front subframe in the upper detection sleeve by using a clearance gauge to judge the position degree deviation direction and the position degree deviation value of the mounting surface of the front subframe, and judging the position degree deviation direction of the nut mounting surface by observing the relative position of the nut mounting surface and the lower detection sleeve;
if the position degree deviation direction of the mounting surface of the front auxiliary frame is opposite to the position degree deviation direction of the nut assembling surface, the out-of-plumb of the mounting stud of the front auxiliary frame is serious, and the mounting stud of the front auxiliary frame needs to be rectified to correct the plumb;
if the direction of positional deviation of the front subframe mounting surface is the same as the direction of positional deviation of the nut mounting surface, performing step S6;
s6, correcting the mounting position of the front subframe mounting stud;
sliding the upper detection sleeve and the lower detection sleeve downwards from the front subframe mounting stud, removing the connection state of the front subframe mounting stud and the cabin edge beam sub-assembly through a detection assembly fixture, re-determining the mounting position of the front subframe mounting stud according to the position degree deviation value of the front subframe mounting surface measured in the step S5, and connecting the front subframe mounting stud and the cabin edge beam sub-assembly through the detection assembly fixture;
s7, sequentially sliding the upper detection sleeve and the lower detection sleeve upwards;
after the mounting position of the mounting stud of the front auxiliary frame is corrected, the position degree of the mounting surface of the front auxiliary frame has no deviation;
if the lower detection sleeve can be sleeved on the nut assembling surface from bottom to top, the verticality of the nut assembling surface meets the requirement, so that the position degree and the verticality of the mounting stud of the front auxiliary frame are qualified;
if the lower detection sleeve cannot be sleeved on the nut assembling surface from bottom to top, the positional deviation of the nut assembling surface is larger than phi 1.4mm, the out-of-tolerance of the verticality of the front auxiliary frame mounting stud is indirectly reflected, and the front auxiliary frame mounting stud needs to be corrected to correct the verticality.
The invention has the beneficial effects that: the front auxiliary frame mounting stud precision gauge can be used for detecting the position degree and the perpendicularity of an auxiliary frame mounting stud, and is simple in structure; the use method of the front subframe installation stud precision gauge is quick and convenient in detection process, production can be effectively guided according to different measurement results, and problem analysis can be quickly carried out.
Drawings
FIG. 1 is a schematic view of a bushing of the subframe assembly mating with a front subframe mounting stud;
FIG. 2 is a schematic structural diagram of a prior art nut mounting face for detecting M14 threads through a phi 15 sleeve;
FIG. 3 is a schematic structural diagram of the front subframe mounting stud precision gauge in the detection process;
FIG. 4 is a schematic structural view of the upper detection sleeve and the lower detection sleeve of the present invention respectively engaged with the front subframe mounting studs;
FIG. 5 is a flow chart of a using method of the front subframe mounting stud accuracy testing fixture.
Description of reference numerals: 1-a front auxiliary frame mounting stud, 11-a front auxiliary frame mounting surface, 12-a nut assembling surface, 2-an auxiliary frame assembly, 3-phi 15 sleeves, 4-a cabin edge beam sub-assembly, 5-a front auxiliary frame mounting stud precision gauge, 51-a mounting stud precision gauge base, 52-a detection component, 521-a slide rail mounting seat, 522-a slide rail, 523-an upper sliding block, 524-an upper detection sleeve, 525-a lower sliding block, 526-a lower detection sleeve, 527-an upper limiting block and 528-a lower limiting block.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 3 to 4, the front subframe mounting stud precision gauge 5 in this embodiment includes a mounting stud precision gauge base 51 and a detection assembly 52, where the detection assembly 52 includes a slide rail mounting seat 521 fixed on the mounting stud precision gauge base 51, a slide rail 522 fixed on the slide rail mounting seat 521, an upper slide block 523 slidably disposed on the slide rail 522, an upper detection sleeve 524 fixed on the upper slide block 523, a lower slide block 525 slidably disposed on the slide rail 522, and a lower detection sleeve 526 fixed on the lower slide block 525, a length direction of the slide rail 522 is along an up-down direction, the upper slide block 523 is located on an upper side of the lower slide block 525, and an inner diameter of the upper detection sleeve 524 is greater than an inner diameter of the lower detection sleeve 526; the detecting assembly 52 further comprises an upper limiting block 527 for preventing the upper slider 523 from sliding out upwards and a lower limiting block 528 for preventing the lower slider 525 from sliding out downwards, wherein the upper limiting block 527 is arranged on the upper side of the sliding rail 522, and the lower limiting block 528 is arranged on the lower side of the sliding rail 522. The slide rail mounting base 521 is connected with the mounting stud precision gauge base 51 through a bolt, the slide rail 522 is connected with the slide rail mounting base 521 through a bolt, a sliding groove structure matched with the upper sliding block 523 and the lower sliding block 525 is arranged on the slide rail 522, the upper detection sleeve 524 is connected with the upper sliding block 523 through a bolt, and the lower detection sleeve 526 is connected with the lower sliding block 525 through a bolt. The front subframe mounting stud precision gauge 5 in the embodiment can be fixed on a cabin boundary beam gauge assembly, the precision of a subframe mounting stud mounted on a cabin boundary beam sub-assembly 4 is detected, the position degree of a front subframe mounting surface 11 is detected through an upper detection sleeve 524, the position degree of a nut mounting surface 12 is detected through a lower detection sleeve 526, and the verticality of the front subframe mounting stud 1 is indirectly judged through the position degree deviation of the front subframe mounting surface 11 and the position degree deviation of the nut mounting surface 12.
As shown in fig. 3-4, the front subframe mounting stud 1 comprises a front subframe mounting surface 11 and a nut mounting surface 12 arranged on the lower side of the front subframe mounting surface 11, a bushing of the subframe assembly 2 is matched with the front subframe mounting surface 11 and then tightened by a nut to realize the connection and fixation of the subframe assembly 2 and the front subframe mounting stud 1, the outer diameter of the front subframe mounting surface 11 is phi 16mm, the inner diameter of the bushing of the subframe assembly 2 is 17mm, the matching tolerance is designed to be 1mm, the position degree is phi 1.0mm in consideration of normal manufacturing tolerance and size chain, and therefore the inner diameter of the upper detection sleeve 524 is phi 17 mm; the nominal diameter of the screw thread of the nut assembling surface 12 is M14mm, when the auxiliary frame assembly 2 is connected with the vehicle body assembly, the theoretical tolerance of the inner diameter of the bushing of the auxiliary frame assembly 2 is 3mm, the nut assembling surface 12 mainly plays a role in guiding and cooperates with a nut in the assembling process, and the actual tolerance requirement is influenced by two factors in the actual situation: 1. the accuracy will be poor during the assembly welding process, the logistics transportation process and the body-in-white welding process by the supplier; 2. the chassis auxiliary frame is non-rigid on the AGV positioning tool, so that the auxiliary frame assembly 2 can have certain movement allowance in the front, back, left and right directions in the process of consignment and assembly from bottom to top, the requirement on the verticality of the front auxiliary frame mounting stud 1 in the process of actual auxiliary frame assembly 2 assembly is not high, except the above factors, the front auxiliary frame mounting stud 1 is welded on the cabin boundary beam sub-assembly 4 through carbon dioxide arc welding, the carbon dioxide arc welding has uncontrollable thermal deformation due to objective reasons and the front auxiliary frame mounting stud 1 is longer (more than 80 mm), if the thermal deformation occurs during the carbon dioxide arc welding, the deviation of the nut assembly surface 12 is amplified, and the verticality of the front auxiliary frame mounting stud 1 and the position degree of the front auxiliary frame mounting surface 11 form a combined tolerance, so that the quick and effective detection is inconvenient, and the position degree of the nut assembly surface 12 is detected through the lower detection sleeve 526, the perpendicularity of the mounting stud 1 of the front subframe is indirectly judged by matching with the upper detection sleeve 524; and (3) carrying out size chain analysis by adopting an extreme value method, wherein the position tolerance band is as follows: a0= a1-a2 (a 0 is a tolerance band of 12-degree position of the nut fitting surface, a1 is tolerance design, and a2 is a tolerance band of 11-degree position of the front subframe mounting surface), i.e., a0=3mm-1mm =2mm, the tolerance of 12-degree position of the nut fitting surface is designed to be 2mm according to the above calculation analysis, but the 12-degree position of the nut fitting surface is set to be 1.4mm due to comprehensive consideration of factors affecting accuracy (such as assembly and welding deformation, etc.), and therefore the inner diameter of the lower detection sleeve 526 is 15.4 mm.
In this embodiment, the upper detection sleeve 524 and the lower detection sleeve 526 are coaxial, so that the perpendicularity of the front subframe mounting stud 1 can be indirectly determined by the positional deviation of the front subframe mounting surface 11 and the positional deviation of the nut mounting surface 12.
As shown in fig. 3 to 5, the invention further provides a use method of the auxiliary frame mounting stud precision gauge, which comprises the following steps:
s1, preparation procedure before detection;
the front subframe mounting stud 1 comprises a front subframe mounting surface 11 and a nut mounting surface 12 arranged on the lower side of the front subframe mounting surface 11, the outer diameter of the front subframe mounting surface 11 is phi 16mm, and the nominal diameter of a thread of the nut mounting surface 12 is M14 mm; the front auxiliary frame mounting stud 1 is connected with the cabin boundary beam sub-assembly 4 through a detection assembly fixture, the cabin boundary beam sub-assembly 4 is positioned through a cabin boundary beam detection tool assembly, a mounting stud precision detection tool base 51 is fixed on the cabin boundary beam detection tool assembly through a bolt, and the position of the front auxiliary frame mounting stud 1 on the cabin boundary beam sub-assembly 4 corresponds to the position of the detection assembly 52; the side sill sub-assembly 4 is a part of the car body assembly, and when products provided by suppliers are accepted, it is inconvenient to assemble all the components on the car body assembly for detection, and it is not easy to judge whether the assembly error occurs or each component itself has a problem, so the vehicle body assembly can be divided into a plurality of sub-assemblies to be respectively detected, the front sub-frame mounting stud 1 is positioned on the cabin edge beam sub-assembly 4, when in detection, the detection assembly fixture connects the front auxiliary frame mounting stud 1 with the cabin edge beam sub-assembly 4, the connection is detachable, so that the relative position of the front auxiliary frame mounting stud 1 and the cabin edge beam sub-assembly 4 can be adjusted conveniently when the detection is unqualified, so that subsequent adjustment can be conveniently carried out, and whether the problem occurs in the front auxiliary frame mounting stud 1 or the problem occurs in the relative position of the front auxiliary frame mounting stud and the cabin edge beam sub-assembly 4 can be conveniently judged during detection.
S2, sliding upper detection sleeve 524 upward;
if the upper detection sleeve 524 cannot pass through the nut assembly surface 12, it is indicated that the position degree and the perpendicularity of the nut assembly surface 12 are seriously out of tolerance, the inner diameter of the upper detection sleeve 524 is 17mm, the outer diameter of the nut assembly surface 12 is 14mm, and the detection is unqualified, it is indicated that the position degree deviation of the nut assembly surface 12 is greater than phi 3mm, the connection state of the front subframe mounting stud 1 and the cabin boundary beam sub-assembly 4 needs to be released through a detection assembly fixture, and the mounting position of the front subframe mounting stud 1 is determined again, and the position degree deviation of the nut assembly surface 12 greater than phi 3mm possibly is caused by inaccurate connection of the front subframe mounting stud 1 and the cabin boundary beam sub-assembly 4, and the operation returns to the step S1 to reassemble the front subframe mounting stud 1 and the cabin boundary beam sub-assembly 4;
if the upper detection sleeve 524 can pass through the nut attachment surface 12, step S3 is performed;
s3, continue sliding upper detection sleeve 524 upward;
when the upper sliding block 523 abuts against the upper limiting block 527, the upper detection sleeve 524 is sleeved on the front sub-frame mounting surface 11; if the upper sliding block 523 cannot move upwards until abutting against the upper limiting block 527, it is determined that the position degree of the front subframe mounting surface 11 is unqualified, the inner diameter of the upper detection sleeve 524 is 17mm, the outer diameter of the front subframe mounting surface 11 is 16mm, the detection is unqualified, it is determined that the position degree deviation of the front subframe mounting surface 11 is greater than phi 1mm, the upper detection sleeve 524 needs to slide out of the front subframe mounting stud 1 downwards, then the connection state of the front subframe mounting stud 1 and the cabin edge beam sub-assembly 4 is released through a detection assembling clamp, the mounting position of the front subframe mounting stud 1 is determined again, the front subframe mounting stud 1 is connected with the cabin edge beam sub-assembly 4 through the detection assembling clamp, and the operation returns to step S1;
if the upper slider 523 can move upward until abutting against the upper limit block 527, which indicates that the position degree of the front subframe mounting surface 11 meets the requirement, step S4 is performed;
s4, sliding the lower detection sleeve 526 upward;
if the lower detection sleeve 526 can be sleeved on the nut assembling surface 12 from bottom to top, it indicates that the perpendicularity of the nut assembling surface 12 meets the requirement, and therefore the position degree and the perpendicularity of the mounting stud 1 of the front subframe are both qualified;
if the lower detection sleeve 526 cannot be sleeved on the nut assembling surface 12 from bottom to top, the inner diameter of the lower detection sleeve 526 is 15.4mm, the outer diameter of the nut assembling surface 12 is 14mm, which indicates that the position deviation of the nut assembling surface 12 is greater than phi 1.4mm, and the verticality of the front subframe mounting stud 1 is indirectly reflected to be out of tolerance, then step S5 is performed;
s5, perpendicularity out-of-tolerance analysis;
measuring the relative position of the front subframe mounting surface 11 in the upper detection sleeve 524 through a clearance gauge to judge the position degree deviation direction and the position degree deviation value of the front subframe mounting surface 11, and observing the relative position of the nut mounting surface 12 and the lower detection sleeve 526 to judge the position degree deviation direction of the nut mounting surface 12;
if the direction of positional deviation of the front subframe attachment surface 11 is opposite to the direction of positional deviation of the nut attachment surface 12, to illustrate that the perpendicularity of the front subframe mounting stud 1 is seriously out of tolerance, taking the example that the left side gap between the front subframe mounting surface 11 and the upper detection sleeve 524 measured by the gap gauge is 0.6mm larger than the right side gap (the left side gap is 0.8mm, and the right side gap is 0.2 mm), if the left side of the nut mounting surface 12 interferes with the left side of the lower detection sleeve 526, since the single-side fit clearance for the assembly of the lower inspection sleeve 526 and the nut mounting face 12 is designed to be 0.7mm, therefore, under the above conditions, the vertical deviation of the front subframe mounting stud 1 at least reaches 1.3mm, the front subframe mounting stud 1 needs to be rectified to correct the verticality, and the rectifying and rectifying mode can be that the self axis of the front subframe mounting stud 1 is changed by external force or the inclined direction of the mounting surface of the front subframe mounting stud is changed by external force;
if the direction of the positional deviation of the front subframe mounting surface 11 is the same as the direction of the positional deviation of the nut mounting surface 12, and the left-side gap between the front subframe mounting surface 11 and the upper detection sleeve 524 measured by the gap gauge is 0.6mm larger than the right-side gap (the left-side gap is 0.8mm, and the right-side gap is 0.2 mm), for example, if the right side of the nut mounting surface 12 interferes with the left side of the lower detection sleeve 526, the vertical deviation of the front subframe mounting stud 1 in the above case reaches at least 0.1mm, and at this time, the front subframe mounting stud 1 may be satisfactory by itself, and only if the lower detection sleeve 526 cannot be fitted onto the nut mounting surface 12 due to an error in the mounting position of the front subframe mounting stud 1, step S6 is performed;
s6, correcting the mounting position of the front subframe mounting stud 1;
sliding the upper detection sleeve 524 and the lower detection sleeve 526 downwards from the front subframe mounting stud 1, relieving the connection state of the front subframe mounting stud 1 and the cabin edge beam subassembly 4 through a detection assembly fixture, re-determining the mounting position of the front subframe mounting stud 1 according to the position degree deviation value of the front subframe mounting surface 11 measured in the step S5, and connecting the front subframe mounting stud 1 with the cabin edge beam subassembly 4 through the detection assembly fixture;
s7, sliding upper detection sleeve 524 and lower detection sleeve 526 upward in sequence;
after the mounting position of the front subframe mounting stud 1 is corrected, the position degree of the front subframe mounting surface 11 has no deviation;
if the lower detection sleeve 526 can be sleeved on the nut assembling surface 12 from bottom to top, it indicates that the perpendicularity of the nut assembling surface 12 meets the requirement, and therefore the position degree and the perpendicularity of the mounting stud 1 of the front subframe are both qualified;
if the lower detection sleeve 526 cannot be sleeved on the nut assembling surface 12 from bottom to top, it is indicated that the positional deviation of the nut assembling surface 12 is larger than phi 1.4mm, which indirectly reflects that the verticality of the front subframe mounting stud 1 is out of tolerance, and the front subframe mounting stud 1 needs to be rectified to correct the verticality.
According to the using method of the auxiliary frame mounting stud precision gauge in the embodiment, whether the auxiliary frame mounting stud is qualified or not is judged through simple and convenient operation steps, unqualified reasons can be found out according to different test results, solutions are provided for different unqualified reasons, the rectification cycle is short, the rectification efficiency is high, production is effectively guided, and problem analysis is rapidly carried out.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. The utility model provides a preceding sub vehicle frame installation stud precision examines utensil, examines utensil base (51) and determine module (52) including the installation stud precision, its characterized in that: the detection assembly (52) comprises a slide rail mounting seat (521) fixed on the mounting stud precision gauge base (51), a slide rail (522) fixed on the slide rail mounting seat (521), an upper sliding block (523) arranged on the slide rail (522) in a sliding mode, an upper detection sleeve (524) fixed on the upper sliding block (523), a lower sliding block (525) arranged on the slide rail (522) in a sliding mode and a lower detection sleeve (526) fixed on the lower sliding block (525), the length direction of the slide rail (522) is along the vertical direction, the upper sliding block (523) is located on the upper side of the lower sliding block (525), and the inner diameter of the upper detection sleeve (524) is larger than that of the lower detection sleeve (526).
2. The front subframe mounting stud accuracy testing fixture of claim 1, wherein: the detection assembly (52) further comprises an upper limiting block (527) used for preventing the upper sliding block (523) from sliding out upwards and a lower limiting block (528) used for preventing the lower sliding block (525) from sliding out downwards, the upper limiting block (527) is arranged on the upper side of the sliding rail (522), and the lower limiting block (528) is arranged on the lower side of the sliding rail (522).
3. The front subframe mounting stud accuracy testing fixture of claim 2, wherein: the inner diameter of the upper detection sleeve (524) is phi 17mm, and the inner diameter of the lower detection sleeve (526) is phi 15.4 mm.
4. The front subframe mounting stud accuracy testing fixture of claim 3, wherein: the upper detection sleeve (524) is coaxial with the lower detection sleeve (526).
5. The use method of the subframe mounting stud accuracy testing fixture according to claim 4, characterized by comprising the following steps:
s1, preparation procedure before detection;
the front subframe mounting stud (1) comprises a front subframe mounting surface (11) and a nut mounting surface (12) arranged on the lower side of the front subframe mounting surface (11), the outer diameter of the front subframe mounting surface (11) is phi 16mm, and the nominal diameter of a thread of the nut mounting surface (12) is M14 mm; the front auxiliary frame mounting stud (1) is connected with the cabin boundary beam sub-assembly (4) through a detection assembly fixture, the cabin boundary beam sub-assembly (4) is positioned through a cabin boundary beam detection tool assembly, the mounting stud precision detection tool base (51) is fixed on the cabin boundary beam detection tool assembly through a bolt, and the position of the front auxiliary frame mounting stud (1) on the cabin boundary beam sub-assembly (4) corresponds to the position of the detection component (52);
s2, sliding the upper detection sleeve (524) upward;
if the upper detection sleeve (524) cannot pass through the nut assembling surface (12), the out-of-tolerance of the position degree and the verticality of the nut assembling surface (12) is serious, the deviation of the position degree of the nut assembling surface (12) is larger than phi 3mm, the connection state of the front subframe mounting stud (1) and the cabin edge beam sub-assembly (4) needs to be released through a detection assembling clamp, the mounting position of the front subframe mounting stud (1) is determined again, and the step S1 is returned;
if the upper detection sleeve (524) can pass through the nut mounting surface (12), performing step S3;
s3, continuing to slide the upper detection sleeve (524) upward;
when the upper sliding block (523) abuts against the upper limiting block (527), the upper detection sleeve (524) is sleeved on the front auxiliary frame mounting surface (11); if the upper sliding block (523) cannot move upwards until the upper sliding block abuts against the upper limiting block (527), the position degree of the front subframe mounting surface (11) is unqualified, the position degree deviation of the front subframe mounting surface (11) is larger than phi 1mm, the upper detection sleeve (524) needs to slide out of the front subframe mounting stud (1) downwards, then the connection state of the front subframe mounting stud (1) and the cabin boundary beam sub-assembly (4) is relieved through a detection assembling clamp, the mounting position of the front subframe mounting stud (1) is determined again, the front subframe mounting stud (1) is connected with the cabin boundary beam sub-assembly (4) through the detection assembling clamp, and the step S1 is returned;
if the upper sliding block (523) can move upwards until abutting against the upper limiting block (527), and the position degree of the front subframe mounting surface (11) meets the requirement, performing step S4;
s4, sliding the lower detection sleeve (526) upward;
if the lower detection sleeve (526) can be sleeved on the nut assembling surface (12) from bottom to top, the verticality of the nut assembling surface (12) meets the requirement, so that the position degree and the verticality of the mounting stud (1) of the front auxiliary frame are qualified;
if the lower detection sleeve (526) cannot be sleeved on the nut assembling surface (12) from bottom to top, the positional deviation of the nut assembling surface (12) is larger than phi 1.4mm, and the out-of-tolerance of the verticality of the mounting stud (1) of the front subframe is indirectly reflected, the step S5 is carried out;
s5, perpendicularity out-of-tolerance analysis;
measuring the relative position of the front subframe mounting surface (11) in the upper detection sleeve (524) through a clearance gauge to judge the position degree deviation direction and the position degree deviation value of the front subframe mounting surface (11), and judging the position degree deviation direction of the nut mounting surface (12) through observing the relative position of the nut mounting surface (12) and the lower detection sleeve (526);
if the position degree deviation direction of the front subframe mounting surface (11) is opposite to the position degree deviation direction of the nut assembling surface (12), the out-of-plumb of the front subframe mounting stud (1) is serious, and the front subframe mounting stud (1) needs to be rectified to correct the plumb;
if the direction of positional deviation of the front subframe mounting surface (11) is the same as the direction of positional deviation of the nut mounting surface (12), performing step S6;
s6, correcting the mounting position of the front subframe mounting stud (1);
sliding the upper detection sleeve (524) and the lower detection sleeve (526) downwards from the front subframe mounting stud (1), relieving the connection state of the front subframe mounting stud (1) and the cabin edge beam sub-assembly (4) through a detection assembly fixture, re-determining the mounting position of the front subframe mounting stud (1) according to the position degree deviation value of the front subframe mounting surface (11) measured in the step S5, and connecting the front subframe mounting stud (1) with the cabin edge beam sub-assembly (4) through the detection assembly fixture;
s7, sequentially sliding the upper detection sleeve (524) and the lower detection sleeve (526) upwards;
after the mounting position of the mounting stud (1) of the front subframe is corrected, the position degree of the mounting surface (11) of the front subframe has no deviation;
if the lower detection sleeve (526) can be sleeved on the nut assembling surface (12) from bottom to top, the verticality of the nut assembling surface (12) meets the requirement, so that the position degree and the verticality of the mounting stud (1) of the front auxiliary frame are qualified;
if the lower detection sleeve (526) cannot be sleeved on the nut assembling surface (12) from bottom to top, the positional deviation of the nut assembling surface (12) is larger than phi 1.4mm, the out-of-tolerance of the verticality of the front auxiliary frame mounting stud (1) is indirectly reflected, and the front auxiliary frame mounting stud (1) needs to be rectified to correct the verticality.
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Cited By (1)
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| CN115452863A (en) * | 2022-09-16 | 2022-12-09 | 沧州北方散热器股份有限公司 | Auxiliary frame welding detection equipment and detection method |
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