CN116306056B - Rotary riveting process parameter development and stability verification method - Google Patents
Rotary riveting process parameter development and stability verification method Download PDFInfo
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Abstract
The invention relates to a rotary riveting process parameter development and stability verification method, which comprises the following steps: step 1, based on the qualification requirements of a rotary riveting product, selecting three process parameters of a pressing distance, a buffering speed and a buffering distance in the rotary riveting process parameters for testing, and determining three process parameter ranges of the qualified product as primary selection parameter ranges; and 2, respectively carrying out a cross grid test on three process parameters of the pressing distance, the buffering speed and the buffering distance according to the initially selected parameter range in the step 1, and establishing a three-dimensional test parameter network to obtain an optimal riveting parameter range. The invention can ensure the stability of the quality of the rotary riveting product.
Description
Technical Field
The invention belongs to the technical field of technological parameter development, and relates to a technological parameter development method, in particular to a rotary riveting technological parameter development and stability verification method.
Background
Common workpiece connection methods in automotive parts include fastener connection, arc welding, resistance welding, pressure riveting, rotary riveting, and the like.
The rotary riveting and other connecting modes are different in structure, the rotary riveting rivet used in the middle exists in the rotary riveting, the workpiece can rotate around the rivet after being riveted, different rotary riveting products are matched with different technological parameters, and therefore the performance of the products is directly affected by the rotary riveting technological parameters.
Fig. 2 is a schematic diagram of a riveting form of a spin riveting structure. As shown in fig. 2, the first part and the second part are rotationally riveted together by a rotational rivet head and a rotational rivet. The second part can rotate around the rotary riveting rivet to the position of the broken line under the action of small torque after rotary riveting.
Currently, the process of determining the technological parameters of the rotary riveting part is that a technician determines a rough range according to equipment specifications and working experience, a plurality of products are manufactured through given parameters in a trial mode and are checked to be qualified, the parameter range is basically determined, and intermediate parameter values are selected to be used as final technological parameters of riveting.
Therefore, the traditional development and determination method for the technological parameters of the rotary riveting products is extensive and simple, has no data support, cannot accurately judge the median value of the technological parameters, and cannot guarantee the stability of the quality of the rotary riveting products.
Therefore, how to provide a method for developing, determining and verifying the stability of the technological parameters of the rotary riveting machine for producing different products is a technical problem to be solved by the technicians in the rotary riveting field.
No prior art publication is found, either the same or similar to the present invention, upon retrieval.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a rotary riveting process parameter development and stability verification method which can ensure the stability of the quality of a rotary riveting product.
The invention solves the practical problems by adopting the following technical scheme:
a rotary riveting process parameter development and stability verification method comprises the following steps:
step 1, based on the qualification requirements of a rotary riveting product, selecting three process parameters of a pressing distance, a buffering speed and a buffering distance in the rotary riveting process parameters for testing, and determining three process parameter ranges of the qualified product as primary selection parameter ranges;
and 2, respectively carrying out cross grid test on three technological parameters of the pressing distance, the buffering speed and the buffering distance according to the initially selected parameter range in the step 1, and establishing a three-dimensional test parameter network to obtain an optimal riveting parameter range.
The specific method of the step 1 is as follows:
based on the past experience or the specification of the rotary riveting equipment, three technological parameters are given in combination with the qualification requirement of the rotary riveting product for testing, if qualified products appear, the three technological parameters of the qualified products are increased or reduced until the qualified products become unqualified products, and the three parameter ranges of the qualified products are determined as the primary selection parameter ranges for further cross grid testing;
moreover, the qualification requirements of the rotary riveting product in the step 1 are as follows: diameter of rivet after spin riveting: phi 12.3mm plus or minus 0.5, rivet height 2.1 plus or minus 0.2mm, rotational torque: 5-15n x m;
the three parameter ranges for determining the qualified product are respectively as follows: the pressing distance is 32.95-33mm, the buffering speed is 0.5-0.7mm/s, and the buffering distance is 5.5-7mm, and the next step of cross grid experiment is carried out as a primary selection parameter range.
Moreover, the specific steps of the step 2 include:
(1) Selecting a pressing distance and a buffering speed to form a cross grid for testing; according to the method, the buffer distance of the initially selected parameter range in the step 1 is kept unchanged, a transverse X-axis is selected from small to large in the range of the pressing distance, a longitudinal Y-axis is selected from small to large in the range of the buffering speed, a cross grid is formed for testing, and the qualified range of the pressing distance and the buffering speed is selected according to the qualified standard of the test;
the selected acceptable range of the pressing distance is 32.96-33.00mm, and the acceptable range of the pressing speed is 0.56-0.68mm/s.
(2) Selecting a pressing distance and a buffering distance to form a cross grid for testing, wherein the buffering speed is 0.62mm/s in accordance with the initially selected parameter range in the step 1, selecting a transverse X-axis from small to large in the pressing distance range and a vertical Z-axis from small to large in the buffering distance range to form the cross grid for testing, and selecting a qualified range of the pressing distance and the buffering distance according to a qualified inspection standard;
the qualified range of the selected pressing down distance is 32.98-33.00mm, and the qualified range of the buffer distance is 5.6-7.1mm.
(3) Selecting a range of buffer distances and buffer speeds to form a cross grid for testing, keeping the pressing distance of 33mm according to the initially selected parameter range in the step 1 unchanged, selecting a longitudinal Y-axis of the buffer speeds from small to large and a vertical Z-axis of the buffer distances from small to large to form the cross grid for testing, and selecting a qualified range of the buffer distances and the buffer speeds according to a qualified inspection standard;
the selected acceptable range of the buffer distance is 5.9-6.8mm, and the acceptable range of the buffer speed is 0.62-0.65mm/s.
(4) And (3) establishing a three-dimensional test parameter network for the qualified ranges of the pressing distance, the buffering speed and the buffering distance of the three process parameters in the cross grid test in the steps (1) - (3), and overlapping and screening out the optimal riveting parameter range.
The specific steps of the step (4) of the step 2 include:
(1) establishing a three-dimensional test parameter network of the qualified ranges of the pressing distance, the buffering speed and the buffering distance of three process parameters in the cross grid test, and marking the qualified ranges of the process parameters:
(2) superposing and screening an optimal riveting parameter range in the three-dimensional test parameter network established in the step (1) in the step (4) in the step 2: the pressing distance is 32.98-33.00mm, the buffering speed is 0.62-0.65mm/s, and the buffering distance is 5.9-6.8mm.
Furthermore, the method further comprises the following steps after the step 2:
step 3, determining upper limit and lower limit values of spin riveting parameters through experiments;
and step 4, verifying the stability of the intermediate value of the rotary riveting process parameter.
The method of the step 3 is as follows:
and (3) respectively carrying out small batch production on the upper limit and the lower limit of the optimal riveting parameter range according to the superposition screening determined in the step (2), respectively carrying out inspection on the products produced according to the upper limit and the lower limit, and determining the upper limit and the lower limit of the spin riveting parameter.
The specific method of the step 4 is as follows:
taking the pressing distances of three process parameters of 33.00mm, the buffer speed of 0.62mm/s and the buffer distance of 6.5mm as intermediate values of the process parameters for continuous production, sampling and checking products, performing high-frequency spot check at the initial stage of production, gradually reducing the checking frequency, spot check at least 30 pieces, recording qualified data and all the products are qualified.
The invention has the advantages and beneficial effects that:
1. the invention provides a rotary riveting process parameter development and stability verification method which is suitable for rotary riveting products, wherein three-dimensional overlapping parts of XYZ are overlapped and screened through the establishment of three-dimensional grid data to obtain optimal process parameters, and the intermediate value of the rotary riveting process parameters is verified, and the output product engineering capacity CPK value is more than 1.33.
2. The invention can determine the optimal technological parameters, can select the upper and lower limit values of the technological parameters under different conditions, and can determine the qualification rate of the product quality by the rotary riveting technological parameter development and stability verification method before formal batch production, thereby reducing the instability of the product quality in the prior batch production and further avoiding the phenomenon of counting and calculating the qualification rate of the product by the batch production process.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic diagram of a riveting structure of a spin riveting structure in the background art of the invention;
FIG. 3 is a schematic diagram of the engineering capacity CPK qualification rate curve of the present invention;
FIG. 4 is a schematic diagram of a three-dimensional grid data plane overlay screening parameter of the present invention;
reference numerals illustrate:
in FIG. 2, 1-swivel rivet; 2-a first part; 3-rotating the riveting rivet; 4-a second part;
in FIG. 3, 5-reject zone, 6-lower pass limit, 7-pass zone, 8-upper pass limit, 9-reject zone, 10-yield curve, 11-select zone A, 12-select zone B, 13-select zone C;
in FIG. 4, the 14-press down distance and the buffer speed constitute the cross grid test qualification range;
15-forming a qualified cross grid test range by the range of the buffer speed and the buffer distance;
the range of the 16-pressing distance and the buffer distance forms a qualified range of the cross grid test;
17-overlapping stereoscopic grid areas of acceptable ranges of pressing distance and buffer speed and buffer distance.
Detailed Description
Embodiments of the invention are described in further detail below with reference to the attached drawing figures:
a rotary riveting process parameter development and stability verification method, as shown in figure 1, comprises the following steps:
and step 1, analyzing requirements and execution standards in the drawing, and determining qualification requirements and quality inspection methods of the rotary riveting products.
In this embodiment, the qualification requirements of the rotary riveting product are: diameter of rivet after spin riveting: phi 12.3mm plus or minus 0.5, rivet height 2.1 plus or minus 0.2mm, rotational torque: 5-15N x M
In this embodiment, the product quality inspection method includes: and (3) inspecting the single-product parts produced in batches, and using the qualified products to reduce the influence of the size deviation of the single-product parts on the test result.
Step 2, preparing production materials, debugging equipment and tooling fixtures, and ensuring that the production materials conform to the production state;
step 3, based on the qualification requirements of the rotary riveting product, selecting three process parameters of the pressing distance, the buffering speed and the buffering distance in the rotary riveting process parameters for testing, and determining three process parameter ranges of the qualified product as primary selection parameter ranges;
in this embodiment, the qualification requirements of the rotary riveting product in the step 3 are as follows:
diameter of rivet after spin riveting: phi 12.3mm plus or minus 0.5, rivet height 2.1 plus or minus 0.2mm, rotational torque: 5-15n x m;
the pressing distance, the buffering speed and the buffering distance in the rotary riveting process parameters play a decisive role in rivet height, torsion value, rivet diameter and the like in the product quality, so that gridding tests are only carried out on the three parameters of the pressing distance, the buffering speed and the buffering distance.
The specific method of the step 3 is as follows:
based on the past experience or the specification of the rotary riveting equipment, three technological parameters are given in combination with the qualification requirement of the rotary riveting product for testing, if qualified products appear, the three technological parameters of the qualified products are increased or reduced until the qualified products become unqualified products, and the three parameter ranges of the qualified products are determined as the primary selection parameter ranges for further cross grid testing;
the three parameter ranges for determining the qualified product are respectively as follows: the pressing distance is 32.95-33mm, the buffering speed is 0.5-0.7mm/s, and the buffering distance is 5.5-7mm, and the next step of cross grid experiment is carried out as a primary selection parameter range.
In this embodiment, although the primary selection parameter range is qualified, the expansion range is limited due to the small number of tests, and it cannot be determined that the primary selection parameter is located in the selected area a or B or C, as shown in fig. 3, the 5-disqualified area, the 6-qualified lower limit, the 7-qualified area, the 8-qualified upper limit, the 9-disqualified area, the 10-qualification curve, the 11-selected area a, the 12-selected area B, and the 13-selected area C; and under the condition that a further cross grid experiment and engineering capability verification are not carried out on the initially selected parameter, whether the parameter is stable and qualified cannot be judged, namely, what the product qualification rate corresponding to any area (such as the selected area A, the selected area B and the selected area C) is cannot be judged, so that a next cross grid experiment is carried out according to the initially selected parameter range to find out the qualified range and the median parameter, and the parameter is positioned in the selected area B through CPK verification, and the product qualification rate is ensured.
In this embodiment, the primary selection parameters of the rotary riveting process are selected, if three process parameters are given through previous experience or rotary riveting equipment description, the test is performed according to the product performance requirements in the drawing, including the drawing requirements of rivet height, torsion value, rivet diameter and the like, the test is performed once by using one riveting process parameter, when a qualified product appears, the qualified product parameters are increased or reduced until the qualified product becomes a non-qualified product, and the parameter range of the qualified product is determined as the primary selection parameter range to perform a further cross grid test.
In this embodiment, the pressing distance, the buffering speed and the buffering distance in the rotary riveting process parameters play a decisive role in the rivet height, the torsion value, the rivet diameter and the like in the product quality, so that the gridding test is performed only on the three parameters of the pressing distance, the buffering speed and the buffering distance. As can be seen in Table 1, the workpieces in parameter 8 all meet the requirements, and the press-down distance can be roughly determined to be between 32.95 and 33mm, the buffer speed is between 0.5 and 0.7mm/s, and the buffer distance is between 5.5 and 7mm by coarse condition selection. When the coarse condition is selected, the numerical value is changed gradually from the numerical value small-vector value, the product quality is changed from unqualified to unqualified and then evolves to super-specification unqualified, the operation is carried out, a qualified area can be roughly screened out, and the qualified range is further determined through the cross grid test in the step 4.
Table 1:
step 4, respectively carrying out a cross grid test on three technological parameters of the pressing distance, the buffering speed and the buffering distance according to the initially selected parameter range in the step 3, and establishing a three-dimensional test parameter network to obtain an optimal riveting parameter range;
in the embodiment, the influence of the pressing distance, the buffering speed and the buffering distance in the process parameters on the quality of the product is the greatest; the pressing distance and the buffering distance mainly influence the rivet height and the rivet diameter; the buffering speed mainly influences the torque value of the rivet;
the three-dimensional digital model structure formed by the change of the three parameters cannot be subjected to experiments at the same time, one parameter in three elements (the pressing distance, the buffering speed and the buffering distance) of the initially selected parameters is required to be ensured to be unchanged, the other two parameters are subjected to cross grid experiments, a data network similar to the XYZ three-dimensional coordinate three-dimensional model is formed, and then three kinds of data are screened to determine the optimal riveting parameter range.
The specific steps of the step 4 include:
(1) Selecting a pressing distance and a buffering speed to form a cross grid for testing; according to the buffer distance of 6.5mm in the primary selected parameter range in the step 3, selecting a transverse X-axis from small to large and a longitudinal Y-axis from small to large for the pressing distance range, and performing a test, and selecting a qualified range of the pressing distance and the buffer speed according to a qualified test standard;
the qualified range of the selected pressing down distance is 32.96-33.00mm, and the qualified range of the pressing down speed is 0.56-0.68mm/s;
table 2:
in this embodiment, the purpose of expanding the values of the pressing distance of the transverse X axis and the buffering speed of the longitudinal Y axis is to verify the primary selected parameter range of the step 3 and simultaneously expand and determine the unqualified area and the qualified range, except for the primary selected parameter range according to the step 3.
Therefore, in this embodiment, the buffer speed is less than 0.52 in the pressing distance 32.94 and less than 0.71 in the pressing distance 33.02, the pressing distance range is selected to 32.96-33.00mm and the buffer speed range is selected to 0.56-0.68mm/s according to the principle that the planar parameter grids are selected to be qualified in both the transverse and longitudinal directions.
(2) Selecting a pressing distance and a buffering distance to form a cross grid for testing, wherein the buffering speed is 0.62mm/s in accordance with the initially selected parameter range in the step 3, selecting a transverse X-axis from small to large in the pressing distance range and a vertical Z-axis from small to large in the buffering distance range to form the cross grid for testing, and selecting a qualified range of the pressing distance and the buffering distance according to a qualified inspection standard;
the qualified range of the selected pressing down distance is 32.98-33.00mm, and the qualified range of the buffer distance is 5.6-7.1mm.
Table 3:
in this embodiment, the buffer speed range in the primary selected parameters according to step 3 is 0.5-0.7mm/s, the median buffer speed in the parameter 8 is 0.68mm/s, the obvious offset of 0.68mm/s can be judged to be larger by combining the additional table 2 in step 4 (1), and the selected buffer speed of 0.62mm/s is stable when the additional table 3 in step 4 (2) is used as the fixed parameter. According to the test data in the attached table 3, in the embodiment, the buffer distance below 5.3 in the pressing distance 32.96 is not qualified, the buffer distance above 7.4 in the pressing distance 33.02 is not qualified, the pressing distance range is selected to be 32.98-33.00mm according to the principle that the planar grid parameter grids are all qualified in the transverse and longitudinal directions, and the buffer distance range is selected to be 5.6-7.1mm.
(3) Selecting a range of buffer distances and buffer speeds to form a cross grid for testing, keeping the pressing distance of 33mm according to the initially selected parameter range in the step 3 unchanged, selecting a longitudinal Y-axis of the buffer speeds from small to large and a vertical Z-axis of the buffer distances from small to large to form the cross grid for testing, and selecting a qualified range of the buffer distances and the buffer speeds according to a qualified inspection standard;
the selected acceptable range of the buffer distance is 5.9-6.8mm, and the acceptable range of the buffer speed is 0.62-0.65mm/s.
Table 4:
in this embodiment, the pressing distance is 33mm according to the initial parameters selected in step 3, and the parameters in table 2 in step 4 (1) and table 3 in step 4 (2) are checked, and the parameters are all in the acceptable range, and the pressing distance can be selected to be 33mm to continue the cross grid test.
According to the test data in the attached table 4, in the embodiment, the buffer speed is less than 0.59, the buffer distance is less than 5.6, the buffer distance is more than 7.1, the buffer speed is more than 7.4, the buffer speed is 0.68, the buffer distance is selected to be 5.9-6.8mm according to the principle that the grid is selected to be qualified in the transverse and longitudinal directions of the planar grid parameter, and the buffer speed is selected to be 0.62-0.65mm/s.
(4) Establishing a three-dimensional test parameter network for the qualified ranges of the pressing distance, the buffering speed and the buffering distance of the three process parameters in the cross grid test in the steps (1) - (3), and overlapping and screening out the optimal riveting parameter range;
the specific steps of the step 4 (4) comprise:
(1) establishing a three-dimensional test parameter network of the qualified ranges of the pressing distance, the buffering speed and the buffering distance of three process parameters in the cross grid test, and marking the qualified ranges of the process parameters:
the pressing distance in the parameters is used as a transverse X axis, the buffering speed is used as a longitudinal Y axis, the buffering distance is used as a vertical Z axis, a three-dimensional test parameter network is established, and a three-dimensional grid meeting the qualified ranges of the three parameters can be screened out in an overlapping mode according to the qualified ranges of the three parameters.
As shown in fig. 4. In the figure: x-push down distance, Y-buffer speed, Z-buffer distance,
14-forming a qualified range of the cross grid test by the pressing distance and the buffer speed;
15-forming a qualified cross grid test range by the range of the buffer speed and the buffer distance;
the range of the 16-pressing distance and the buffer distance forms a qualified range of the cross grid test;
17-overlapping three-dimensional grid areas of qualified ranges of the pressing distance, the buffering speed and the buffering distance;
in the step 4, the cross grid test of the technological parameters is the most important parameter selection basis in the test, the three parameter qualification ranges are selected from qualified ranges in three grid composition three-dimensional ranges, the selected pressing distance ranges in the attached table 2 are 32.96-33.00mm, the selected pressing distance ranges in the attached table 3 are 0.56-0.68mm/s, the selected pressing distance ranges in the attached table 3 are 32.98-33.00mm, the selected buffering distance ranges in the attached table 3 are 5.6-7.1mm, the selected buffering distance ranges in the attached table 4 are 5.9-6.8mm, and the selected buffering speed ranges in the attached table 4 are 0.62-0.65mm/s.
(2) Superposing and screening an optimal riveting parameter range in the three-dimensional test parameter network established in the step (1) in the step (4): the pressing distance is 32.98-33.00mm, the buffering speed is 0.62-0.65mm/s, and the buffering distance is 5.9-6.8mm.
In the embodiment, the pressing distance range of 32.96-33.00mm is selected by referring to the pressing distance range in the accompanying table 2, the pressing distance range in the accompanying table 3 is selected to be 32.98-33.00mm, and the pressing distance of 32.98-33.00mm can be determined to be qualified;
the buffer speed range in the attached table 2 is selected to be 0.56-0.68mm/s, the buffer speed range in the attached table 4 is selected to be 0.62-0.65mm/s, and the buffer speed is determined to be 0.62-0.65mm/s to be qualified;
the buffer distance ranges in Table 3 are selected from 5.6 to 7.1mm, and the buffer distances in Table 4 are selected from 5.9 to 6.8mm, and the buffer distances can be determined from 5.9 to 6.8mm.
The three-dimensional parameter grid formed in the area where the three elements (the pressing distance, the buffering speed and the buffering distance) of the process parameters are all qualified is the qualified parameter result of the overlapping screening of the parameters, the pressing distance is 32.98-33.00mm, the buffering speed is 0.62-0.65mm/s, and the buffering distance is 5.9-6.8mm.
In this embodiment, the cross grid experiment includes not only the primary selection parameter range but also extends beyond the primary selection range and performs the experiment, such experiment is to process from the product disqualification state to the product qualification state, and finally process to the disqualification state beyond the error, and the parameter range of the intermediate qualification state is taken, so that not only the area selected by the primary selection parameter is further verified, but also the qualified range of the process parameter three elements (the pressing distance, the buffering speed and the buffering distance) can be more accurate through the cross grid test screen in the finer step 4 and the superposition screening by the establishment of the three-dimensional grid data.
Step 5, determining upper limit and lower limit values of spin riveting parameters through experiments;
the method of the step 5 is as follows: and (3) screening out the upper limit and the lower limit of the optimal riveting parameter range (the pressing distance is 32.98-33.00mm, the buffering speed is 0.62-0.65mm/s, and the buffering distance is 5.9-6.8 mm) according to the superposition determined in the step (4), respectively carrying out small batch production, wherein the number of the produced products is small, respectively inspecting the products according to the upper limit and the lower limit, and determining that the selected upper limit and lower limit range are qualified.
The purpose of this test was to ensure a safe boundary range for the process parameters, i.e. to verify the 8 parameter limit vertices of the three-element three-dimensional network cube of fig. 4, which had little impact on product quality even if slight deviations occurred in production.
Step 6, verifying the stability of the intermediate value of the spin riveting process parameter;
the specific method of the step 6 is as follows:
and 5, determining that the upper limit and the lower limit of the three elements of the process parameters are qualified, taking the three elements of the process parameters (the pressing distance is 33.00mm, the buffering speed is 0.62mm/s and the buffering distance is 6.5 mm) as the intermediate value of the process parameters for continuous production, and because the process is the first batch production, sampling inspection is carried out on the products, the high-frequency spot inspection can be carried out in the initial production stage, the inspection frequency is gradually reduced, at least 30 pieces of spot inspection are carried out, qualified data are recorded, and all the products are qualified.
Table 5:
and according to the detection data, outputting the engineering capacity unilateral CPK value not lower than 1.33.
Table 6:
according to the unilateral CPK data result of engineering capability in the attached table 6, the rivet head height is the most stable, the CPK value reaches 3.82, the rotating torque value reaches 3.56, the CPK of the rivet head diameter also reaches 1.36, both exceeds 1.33, the bad probability is below 0.005%, and therefore the parameter can be judged to be the optimal production process parameter of the product. The data of the spot check is stability verification of parameter median, and the higher the consistency of the detection result is, the higher the CPK value is, which indicates that the more stable the product quality is and the lower the probability of defective products is.
The CPK value and reject ratio comparison table is shown in Table 7:
table 7:
the invention is characterized in that the adjustable range of the parameters of the product is determined while referring to the performance parameters provided by the equipment, the three-dimensional overlapped parts of the XYZ three sides are overlapped and screened to be the optimal technological parameters through the establishment of three-dimensional grid data, and the intermediate value of the rotary riveting technological parameters is verified, and the output CPK value of the engineering capability of the product is more than 1.33, so that the unqualified occurrence probability of the product is extremely low, and the stability of the production quality can be ensured.
It should be emphasized that the embodiments described herein are illustrative rather than limiting, and that this invention encompasses other embodiments which may be made by those skilled in the art based on the teachings herein and which fall within the scope of this invention.
Claims (9)
1. A rotary riveting process parameter development and stability verification method is characterized in that: the method comprises the following steps:
step 1, based on the qualification requirements of a rotary riveting product, selecting three process parameters of a pressing distance, a buffering speed and a buffering distance in the rotary riveting process parameters for testing, and determining three process parameter ranges of the qualified product as primary selection parameter ranges;
step 2, respectively carrying out a cross grid test on three process parameters of the pressing distance, the buffering speed and the buffering distance according to the initially selected parameter range in the step 1, and establishing a three-dimensional test parameter network to obtain an optimal riveting parameter range;
the specific steps of the step 2 include:
(1) Selecting a pressing distance and a buffering speed to form a cross grid for testing; according to the buffer distance of the initially selected parameter range in the step 1, selecting a transverse X-axis from small to large in the range of the pressing distance and a longitudinal Y-axis from small to large in the buffer speed to form a cross grid for testing, and selecting a qualified range of the pressing distance and the buffer speed according to a qualified inspection standard;
(2) Selecting a pressing distance and a buffering distance to form a cross grid for testing, selecting a transverse X-axis from small to large and a vertical Z-axis from small to large for the pressing distance range to form the cross grid for testing according to the buffering speed of the primary selected parameter range in the step 1, and selecting a qualified range of the pressing distance and the buffering distance according to a qualified inspection standard;
(3) Selecting a range of buffer distances and buffer speeds to form a cross grid for testing, selecting a longitudinal Y-axis of the buffer speeds from small to large and a vertical Z-axis of the buffer distances from small to large to form the cross grid for testing according to the pressing distance of the primary selected parameter range in the step 1, and selecting a qualified range of the buffer distances and the buffer speeds according to a qualified inspection standard;
(4) Establishing a three-dimensional test parameter network for the qualified ranges of the pressing distance, the buffering speed and the buffering distance of the three process parameters in the cross grid test in the steps (1) - (3), and overlapping and screening out the optimal riveting parameter range;
the specific method of the step (4) of the step 2 is as follows:
and establishing a three-dimensional test parameter network of the qualified ranges of the pressing distances, the buffering speeds and the buffering distances of three process parameters in the cross grid test, and marking the qualified ranges of the process parameters.
2. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 1, wherein the method comprises the following steps: the specific method of the step 1 is as follows:
based on the past experience or the specification of the rotary riveting equipment, three technological parameters are given in combination with the qualification requirement of the rotary riveting product for testing, if qualified products appear, the three technological parameters of the qualified products are increased or reduced until the qualified products become unqualified products, and the three parameter ranges of the qualified products are determined as the primary selection parameter ranges for further cross grid testing.
3. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 1, wherein the method comprises the following steps: the qualification requirements of the rotary riveting product in the step 1 are as follows: diameter of rivet after spin riveting: phi 12.3mm plus or minus 0.5, rivet height 2.1 plus or minus 0.2mm, rotational torque: 5-15n x m.
4. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 1, wherein the method comprises the following steps: the three parameter ranges for determining the qualified product are respectively as follows: the pressing distance is 32.95-33mm, the buffering speed is 0.5-0.7mm/s, and the buffering distance is 5.5-7mm, and the next step of cross grid experiment is carried out as a primary selection parameter range.
5. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 1, wherein the method comprises the following steps: the specific steps of the step 2 include:
(1) Selecting a pressing distance and a buffering speed to form a cross grid for testing; according to the method, the buffer distance of the initially selected parameter range in the step 1 is kept unchanged, a transverse X-axis is selected from small to large in the range of the pressing distance, a longitudinal Y-axis is selected from small to large in the range of the buffering speed, a cross grid is formed for testing, and the qualified range of the pressing distance and the buffering speed is selected according to the qualified standard of the test;
the qualified range of the selected pressing down distance is 32.96-33.00mm, and the qualified range of the pressing down speed is 0.56-0.68mm/s;
(2) Selecting a pressing distance and a buffering distance to form a cross grid for testing, wherein the buffering speed is 0.62mm/s in accordance with the initially selected parameter range in the step 1, selecting a transverse X-axis from small to large in the pressing distance range and a vertical Z-axis from small to large in the buffering distance range to form the cross grid for testing, and selecting a qualified range of the pressing distance and the buffering distance according to a qualified inspection standard;
the qualified range of the selected pressing down distance is 32.98-33.00mm, and the qualified range of the buffer distance is 5.6-7.1mm;
(3) Selecting a range of buffer distances and buffer speeds to form a cross grid for testing, keeping the pressing distance of 33mm according to the initially selected parameter range in the step 1 unchanged, selecting a longitudinal Y-axis of the buffer speeds from small to large and a vertical Z-axis of the buffer distances from small to large to form the cross grid for testing, and selecting a qualified range of the buffer distances and the buffer speeds according to a qualified inspection standard;
the qualified range of the selected buffer distance is 5.9-6.8mm, and the qualified range of the buffer speed is 0.62-0.65mm/s;
(4) And (3) establishing a three-dimensional test parameter network for the qualified ranges of the pressing distance, the buffering speed and the buffering distance of the three process parameters in the cross grid test in the steps (1) - (3), and overlapping and screening out the optimal riveting parameter range.
6. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 1, wherein the method comprises the following steps: and (3) superposing and screening the optimal riveting parameter range in the established three-dimensional test parameter network in the step (2) and the step (4) as follows: the pressing distance is 32.98-33.00mm, the buffering speed is 0.62-0.65mm/s, and the buffering distance is 5.9-6.8mm.
7. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 1, wherein the method comprises the following steps: the method further comprises the following steps after the step 2:
step 3, determining upper limit and lower limit values of spin riveting parameters through experiments;
and step 4, verifying the stability of the intermediate value of the rotary riveting process parameter.
8. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 7, wherein the method comprises the following steps: the method of the step 3 is as follows:
and (3) respectively carrying out small batch production on the upper limit and the lower limit of the optimal riveting parameter range according to the superposition screening determined in the step (2), respectively carrying out inspection on the products produced according to the upper limit and the lower limit, and determining the upper limit and the lower limit of the spin riveting parameter.
9. The method for developing and verifying the stability of the rotary riveting process parameters according to claim 7, wherein the method comprises the following steps: the specific method of the step 4 is as follows:
taking the pressing distances 33.00mm, the buffer speed 0.62mm/s and the buffer distance 6.5mm of three process parameters as intermediate values of the process parameters for continuous production, sampling and checking products, performing high-frequency spot check at the initial stage of production, gradually reducing the check frequency, spot check at least 30 pieces and recording qualified data, and all the products are qualified, thereby finishing the verification of the stability of the intermediate values of the spin riveting process parameters.
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