CN104138938B - Double-fold unfolding sheet metal parts length parameter determines method and production method - Google Patents

Abstract

The present invention relates to a method for determining the unfolded length parameters of double-folded sheet metal parts and a production method. First, according to the product part diagram, the sum L' of the basic lengths of all folded edges between any two points to be determined is obtained; Select the bending deduction value K corresponding to all the bending angles between any two points to be determined in the table, judge whether the bending deduction value needs to be corrected during the selection process, and deduct the bending deduction corresponding to the bending angle that needs to be corrected Correct the value to obtain the bending deduction value K _i corresponding to the corrected bending angle; retain the original value of the bending deduction value corresponding to the bending angle that does not need to be corrected; then the unfolded length between any two points to be determined The sum L' of the basic lengths of all folded edges is subtracted from the sum of the bend deduction values K _i corresponding to all bend angles. The error of the unfolded length parameters of any two points determined by the method is obviously reduced, the quality of the double-folded sheet metal parts is improved, and the parts are scrapped and waste caused by processing errors out of tolerance is avoided.

Description

Determination method and production method of unfolded length parameters of double-folded sheet metal parts

technical field

The invention relates to a method for determining the unfolded length parameter of a bent sheet metal part, in particular to a method for determining the unfolded length parameter of a double-folded sheet metal part and a production method.

Background technique

Bending is one of the commonly used stamping processing methods for sheet metal parts. It is widely used in the processing of sheet metal parts. Double folding refers to bending the metal sheet inwards to a certain angle, and then turning one end of the metal sheet backwards. Bending outwards and flattening, and then bending this end inwards to form the same sheet metal processing process as the bending angle of the inner metal sheet. When calculating the blanking length required for bending parts, generally use Theoretical formula calculation, the theoretical calculation formula is L=L-K, in this theoretical calculation formula, L' is the sum of the basic lengths of all folded edges marked on the part drawing between any two points to be determined, the basic length of each folded edge The length is the straight-line distance from the edge away from the bending angle to the outside of the other edge of the bending angle, K is the sum of the bending deduction values at all bending angles between any two points to be determined, In actual processing, the operator generally chooses according to experience or in the bending factor table. Since this bending deduction value is summarized according to general laws, it is not applicable to all bending situations. Therefore, the actual processed parts are different from the designed ones. Parts have large errors.

Contents of the invention

The purpose of the present invention is to propose a method for determining the unfolded length parameter of a double-folded sheet metal part, which can determine the developed length parameter of the double-folded sheet metal part with high precision. Also provided is a sheet metal production method for determining the unfolded length parameter of the sheet metal using the above method.

In order to solve the above problems, the technical scheme adopted in the method for determining the unfolded length parameters of double-folded sheet metal parts in the present invention is:

The method for determining the unfolded length parameters of double-folded sheet metal parts includes the following steps,

A. According to the product part drawing, obtain the sum L' of the basic lengths of all folded edges between any two points to be determined;

B. Select the bending deduction value K corresponding to all bending angles between any two points to be determined in the bending factor table. During the selection process, according to the bending that appears on both sides of each bending angle in the product part diagram Determine whether the bending deduction value corresponding to the bending angle needs to be corrected, correct the bending deduction value corresponding to the bending angle that needs to be corrected, and use the corrected value as the bending deduction corresponding to the bending angle that needs to be corrected value K _i ; for the bending deduction value corresponding to the bending angle that does not need to be corrected, the original value in the bending factor table is used as the bending deduction value K _i ; then the unfolded length between any two points to be determined is The sum L' of the basic lengths of all folded edges minus the sum of the bend deduction values K _i corresponding to all bend angles.

The bending deduction value described in the above step B needs to correct the bending angle when the bending angle is 90 degrees for the double-folded inner sheet and one side of the bending angle continues to be reversely bent for 180° Degree, the bending deduction value K _i corresponding to the bending angle is 3.39mm.

The bending deduction value described in the above step B needs to correct the bending angle when the bending angle is 90 degrees for the double-folded inner layer plate and the two sides forming the bending angle continue to bend 90 degrees , the bending deduction value K _i corresponding to the bending angle is 3.3mm.

The bending deduction value described in the above step B needs to correct the bending angle when the bending angle is 90 degrees for the double-folded outer sheet and one side of the bending angle is bent by 180 degrees, and the other side is bent by 180 degrees. When bending at 90 degrees, the bending deduction value K _i corresponding to the bending angle is 4.2mm.

In the present invention, the technical scheme adopted by the double-folded sheet metal production method using the above-mentioned method to determine the unfolded length parameter of the sheet metal is:

A method for producing a double-folded sheet metal part, comprising the following steps,

A. According to the product part drawing, obtain the sum L' of the basic lengths of all folded edges between any two points to be determined;

B. Select the bending deduction value K corresponding to all bending angles between any two points to be determined in the bending factor table. During the selection process, according to the bending that appears on both sides of each bending angle in the product part diagram Determine whether the bending deduction value corresponding to the bending angle needs to be corrected, correct the bending deduction value corresponding to the bending angle that needs to be corrected, and use the corrected value as the bending deduction corresponding to the bending angle that needs to be corrected value K _i ; for the bending deduction value corresponding to the bending angle that does not need to be corrected, the original value in the bending factor table is used as the bending deduction value K _i ; then the unfolded length between any two points to be determined is The sum L' of the basic lengths of all folded edges minus the sum of the bend deduction values K _i corresponding to all bend angles;

C. Cut the material according to the determined development length parameters to obtain the metal sheet of the required specification;

D. Perform double-folded sheet metal processing on the metal sheet according to the product part drawing to obtain the required double-folded sheet metal parts.

The bending deduction value described in the above step B needs to correct the bending angle when the bending angle is 90 degrees for the double-folded inner sheet and one side of the bending angle continues to be reversely bent for 180° Degree, the bending deduction value K _i corresponding to the bending angle is 3.39mm.

The bending deduction value described in the above step B needs to correct the bending angle when the bending angle is 90 degrees for the double-folded inner layer plate and the two sides forming the bending angle continue to bend 90 degrees , the bending deduction value K _i corresponding to the bending angle is 3.3mm.

The bending deduction value described in the above step B needs to correct the bending angle when the bending angle is 90 degrees for the double-folded outer sheet and one side of the bending angle is bent by 180 degrees, and the other side is bent by 180 degrees. When bending at 90 degrees, the bending deduction value K _i corresponding to the bending angle is 4.2mm.

Before the above step D, corresponding sheet metal processing can be performed on the metal sheet according to the determined development length parameters between any points.

The method for determining the unfolded length parameters of a double-folded sheet metal part and the production method proposed by the present invention judge whether the bending deduction value corresponding to the bending angle needs to be corrected according to the different bending conditions of the sheet metal part, and determine whether the bending angle that needs to be corrected The corresponding bending deduction value is corrected, and the bending deduction value corresponding to the bending angle that does not need to be corrected is directly selected from the bending factor table. The developed length parameters between the points, the error of the developed length parameters of any two points of the double-folded sheet metal parts determined by this method is significantly reduced, the quality of the double-folded sheet metal parts is improved, and the machining error is avoided. The processed sheet metal parts are scrapped, resulting in a waste of manpower and material resources.

Further, an appropriate correction value is selected according to different bending angles of the sheet metal parts to further ensure the accuracy of the unfolded length parameter and improve the product quality of the sheet metal parts.

Further, according to the determined expansion length parameters of any two points of the sheet metal part, the required sheet is obtained by blanking, and the corresponding sheet metal processing is performed before bending, which can reduce the difficulty of processing while ensuring accurate positioning, and reduce the installation cost. Clamping times, improve processing efficiency.

Description of drawings

Fig. 1 is a part diagram of a double-folded sheet metal part to be processed;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the left view of Fig. 1;

Fig. 4 is the right view of Fig. 1;

Fig. 5 is a position diagram of each parameter to be determined in the parts diagram in Fig. 1;

Fig. 6 is the situation of the bending angle corresponding to the first basic bending deduction value;

Fig. 7 is the situation of the bending angle corresponding to the second basic bending deduction value;

Fig. 8 is the situation of the bending angle corresponding to the third basic bending deduction value;

Fig. 9 is a position diagram of each bending angle in Embodiment 1 of the production method of double-folded sheet metal parts of the present invention; it is also the position diagram of each bend in Embodiment 1 of the method for determining the unfolded length parameters of double-folded sheet metal parts of the present invention Angle location map;

Figure 10 is a diagram of the bending angle position corresponding to Embodiment 2 of the production method of double-folded sheet metal parts in the present invention; it is also corresponding to Embodiment 2 of the method for determining the unfolded length parameters of double-folded sheet metal parts of the present invention The position diagram of the bending angle;

Fig. 11 is a diagram of the bending angle position corresponding to Embodiment 3 of the production method of double-folded sheet metal parts in the present invention; it is also corresponding to Embodiment 3 of the method for determining the unfolded length parameters of double-folded sheet metal parts of the present invention The position diagram of the bending angle;

Fig. 12 is a diagram of the bending angle position corresponding to Embodiment 4 of the production method of double-folded sheet metal parts in the present invention; it is also corresponding to Embodiment 4 of the method for determining the unfolded length parameters of double-folded sheet metal parts of the present invention Location diagram of the bend corner.

detailed description

Embodiment 1 of the production method of the double-folded sheet metal part of the present invention: as shown in Figures 1 to 9, the production method of the double-folded sheet metal part in this embodiment includes the following steps: 1) According to the parameters marked in the part diagram, Determine the sum L' of the basic lengths of all folds between any two points to be determined; 2) According to the bending condition in the part drawing, select the corresponding bend in the bending factor table according to the plate thickness and bending angle Deduction value, when the bending deduction value in the bending factor table is 2 mm, the values of the basic bending deduction value K corresponding to the three basic bending angles in Figure 6 to Figure 8 are respectively: as shown in Figure 6 It is the first type of basic bending angle. At this time, the bending angle is 90 degrees. The bending deduction value corresponding to this bending angle is 3.5mm, as shown in Figure 7. In the case of the basic bending angle, the bending angle is 180 degrees at this time, and the bending deduction value corresponding to the bending angle is 0.86mm for the second basic bending deduction value K2, as shown in Figure 8, at this time it is a U-shaped double Folding, that is, bending the sheet into a U shape, and then bending one of the ends reversely 180 degrees, and then continue to bend it into a U shape, including the two-layer U-shaped structure connected inside and outside. At this time, the bending of the inner sheet The bending deduction value corresponding to the angle takes the first basic bending deduction value K1, and the bending deduction value corresponding to the bending angle at the joint of the inner and outer plates is 180 degrees takes the second basic bending deduction value K2, the bending deduction value corresponding to the bending angle of the outer layer plate is the third basic bending deduction value K3 is 4.3mm, La, Lb, Lc, Ld in the figure all represent the basic length of each folding edge; when bending The bending deduction value corresponding to the bending angle needs to be corrected when the angle is in the following three situations: a) When the bending angle is the bending angle r1, r5 as shown in Figure 9, that is, when the bending angle is 90 degrees double bending When one side of the inner layer plate of the side and one of the sides forming the bending angle continues to be reversely bent by 180 degrees, the bending deduction value at the bending angle needs to be corrected, and the bending angle corresponding to the bending angle Rs1 The deduction value is corrected to 3.39mm, and the corrected bending deduction value is used as the bending deduction value corresponding to the bending angle; b) When the bending angle is the bending angle at r7 in Figure 9, that is, when the bending When the double-folded inner plate with a bending angle of 90 degrees and the two sides forming the bending angle continue to bend at 90 degrees, the bending deduction value at the bending angle needs to be corrected, and the bending Correct the bending deduction value corresponding to the corner to 3.3mm, and use the corrected bending deduction value as the bending deduction value corresponding to the bending angle; c) When the bending angle is the bending angle at r6 in Figure 9 , that is, when the bending angle is 90 degrees for the double-folded outer sheet and one side of the bending angle is bent at 180 degrees and the other side is bent at 90 degrees, the bending at the bending angle is required. Correct the deduction value, and correct the bending deduction value corresponding to the bending angle to 4.2mm, and use the corrected bending deduction value as the bending deduction value corresponding to the bending angle; other bends that do not need to be corrected Angle, the basic bending deduction value corresponding to the bending angle is used as the bending deduction value corresponding to the bending angle, and the length between any two points is the basic value of all folded edges between the arbitrary two points The sum of the lengths L'

Subtract the sum of all bending deduction values between any two points; 3) Cut the material according to the determined expansion length parameters to obtain the metal sheet of the required specification; 4) Perform double folding on the metal sheet according to the part drawing of the product sheet metal processing to obtain the required double-folded sheet metal parts.

Taking the part diagram of the sheet metal part to be processed as shown in Fig. 1 to Fig. 4 as an example, to process the sheet metal part according to the above method, first determine the total length L and the total width W of the part according to the part diagram, and The positions L1, L2, L3, L4, L5, L6, L7, L8 of each hole; the bending deduction values corresponding to each bending angle are shown in Table 1 and Table 2, and the unit of each value in the table is mm, and the r1, r2, r3, r4, r5, r6, r7, and r8 represent the positions of the bending angles respectively, and the specific positions corresponding to the bending angles involved in this part diagram are shown in Figure 9:

Table 1 The bending deduction value corresponding to the bending angle that does not need to be corrected

Bend angle position r1 r2 r3 r4 r5 r6 r7 r8 Basic bending deduction value K 3.5 0.86 4.3 0.86 3.5 4.3 3.5 4.3

Table 2 The bending deduction value corresponding to the bending angle corrected according to the above method

Bend angle position r1 r2 r3 r4 r5 r6 r7 r8 Bend Deduction 3.39 0.86 4.3 0.86 3.39 4.2 3.3 4.3

Use the above two groups of bending deduction values to expand the part drawing in the sheet metal processing module of Solidworks. The calculated length parameters in the expanded drawing are shown in Table 3. The unit of each value in the table is mm, and in the table The specific positions indicated by L, W, L1, L2, L3, L4, L5, L6, L7, and L8 are shown in Figure 5:

Table 3 Comparison of the actual unfolding parameters and the unfolding parameters calculated in the Solidworks sheet metal processing module by using the basic bending deduction value and the corrected bending deduction value respectively

It can be seen that the maximum error of the expansion parameters calculated in the solidworks sheet metal processing module according to the basic bending deduction value is 0.4mm, and there is also a gap of 0.2mm or 0.4mm between the holes in the length direction. Error, use the parameters determined by the bending deduction value to carry out blanking, punching, bending and other corresponding sheet metal parts obtained by sheet metal processing, measure the size of the sheet metal part obtained by processing and the corresponding size in the designed part drawing In contrast, the total width of the sheet metal part obtained by its processing and the position of some holes do not match the designed part drawing; the corrected bending deduction value obtained after trimming the corresponding value according to the correction method proposed by the present invention is in the solidworks The unfolding parameters are calculated in the sheet metal processing module, and the obtained unfolding parameters reduce the error from the original 0.4mm to 0.01mm. The required sheet metal parts are processed by using the parameters determined by each bending deduction value in this method, and the measured The size of the sheet metal parts is compared with the corresponding dimensions in the designed part drawing. The error of each size of the processed sheet metal parts and the corresponding dimensions in the designed part drawing is very small, all within the allowable range within. It can be seen from this that the correction method provided by the present invention is used to correct the bending deduction value in the calculation, and each corrected bending deduction value meets the processing requirements in actual processing applications, and can be applied to the sheet metal in the computer-aided design software. In the gold processing module, the expansion calculation is more accurate, convenient and fast. After the unfolding parameters are calculated according to this method, blanking is carried out according to the parameters, and the sheet metal processing of punching can be directly carried out after blanking according to the positions of each hole obtained by calculation, and then the sheet metal processing of double folding is carried out to obtain the obtained Parts are required. Punching is performed before double-folding sheet metal processing, which can be clamped in sequence to complete the processing of holes in multiple positions, reducing the number of clamping times and improving processing efficiency.

Embodiment 2 of the production method of double-folded sheet metal parts of the present invention: the part diagram in the above-mentioned embodiment is relatively complicated, and the determination of the expansion parameters of the part diagram involves three kinds of bending angles that need to be corrected. This embodiment is different from the above-mentioned embodiment Notably, this embodiment only relates to the situation when the bending angle is the bending angle Rs1 as shown in Figure 10, that is, when the bending angle is 90 degrees, the double-folded inner layer plate constitutes the bending angle. When continuing to reversely bend 180 degrees, it is necessary to correct the bending deduction value at the bending angle, and correct the bending deduction value corresponding to the bending angle Rs1 to 3.39mm. The bending deduction value is used as the bending deduction value corresponding to the bending angle. For other bending angles that do not need to be corrected, the basic bending deduction value corresponding to the bending angle is used as the bending deduction value corresponding to the bending angle. Using the parameter determination method in this embodiment to unfold and bend the corresponding parts, the sheet metal parts obtained are consistent with the dimensions in the designed part drawings, and are suitable for the actual processing of double-bending sheet metal parts.

Embodiment 3 of the method for producing a double-folded sheet metal part of the present invention: the difference between this embodiment and Embodiment 2 is that when the bending angle is the bending angle at Rs2 in Figure 11, that is, when the bending angle is When the 90-degree double-folded inner layer plate and the two sides forming the bending angle continue to bend 90 degrees, the bending deduction value at the bending angle Rs2 needs to be corrected, and the bending angle corresponds to Correct the bending deduction value to 3.3mm, and use the corrected bending deduction value as the bending deduction value corresponding to the bending angle. For other bending angles that do not need to be corrected, use the basic bending The bend deduction value is used as the bend deduction value corresponding to the bend angle. The length between any two points is the sum L' of the basic lengths of all folded edges between the arbitrary two points minus the sum of all bending deduction values between the arbitrary two points. Using the parameter determination method in this embodiment to unfold and bend the corresponding parts, the sheet metal parts obtained are consistent with the dimensions in the designed part drawings, and fully conform to the actual processing of double-bending sheet metal parts.

Embodiment 4 of the production method of double-folded sheet metal parts of the present invention: the difference between this embodiment and Embodiment 2 is that when the bending angle is the bending angle at Rs3 in Figure 12, that is, when the bending angle is 90 degree double-folded outer sheet and one side of the bending angle is bent at 180 degrees and the other side is bent at 90 degrees, the bending deduction value at the bending angle needs to be corrected, and the The bending deduction value corresponding to the bending angle is corrected to 4.2mm, and the corrected bending deduction value is used as the bending deduction value corresponding to the bending angle. For other bending angles that do not need to be corrected, the bending angle The corresponding basic bending deduction value is used as the bending deduction value corresponding to the bending angle. The length between any two points is the sum L' of the basic lengths of all folded edges between the arbitrary two points minus the sum of all bending deduction values between the arbitrary two points. Using the parameter determination method in this embodiment to unfold and bend the corresponding parts, the sheet metal parts obtained are consistent with the dimensions in the designed part drawings, and fully conform to the actual processing of double-bending sheet metal parts.

The above-mentioned embodiments respectively relate to one of the bending angle situations requiring correction of the bending deduction value and three bending angle situations requiring correction of the deduction value at the same time. In other embodiments of the present invention, only two of them may be involved at the same time. If two kinds of bending deduction values need to correct the bending angle, according to the actual part drawing, use the corresponding corrected bending deduction value for any two bending angles involved in the bending process, and the obtained sheet metal parts are the same as The parameters of the designed parts are compared and analyzed, and the size of the obtained sheet metal parts fully meets the actual production needs.

In each of the above-mentioned embodiments, before performing the double-folding sheet metal processing on the plate, the punching process is first performed on the plate, and in other embodiments of the present invention, it can also be punched after the double-folding Or other necessary sheet metal processing procedures.

The embodiment of the method for determining the unfolded length parameters of a double-folded sheet metal part in the present invention includes two steps of determining the sum of the basic lengths of all the folded edges and the adopted bending deduction value, wherein the sum of the basic lengths of all the folded edges is determined The content is the same as that of step 1 in the above-mentioned embodiments, and the content of determining the bending deduction value to be adopted is the same as that of step 2 in the above-mentioned embodiments, and will not be repeated here.

Claims (3)

1. double-fold unfolding sheet metal parts length parameter determines method, it is characterised in that: comprise the following steps,

A, according to product parts figure, it is thus achieved that the fundamental length of all flangings between any two points to be determined it And L '；

The folding that B, all bending angles chosen in bending factor table between this any two points to be determined are corresponding Curved deduction value K, the bending situation occurred according to both sides, each bending angle in product parts figure during choosing judges Bent buckling corresponding to this bending angle except value is the need of correction, any one in bending angle is following three kinds of situations Need the bent buckling that doubling bent angle is corresponding to remove value when planting to be modified: a) when the double-fold that bending angle is 90 degree Internal layer sheet material and constitute this bending angle wherein while continue inverse bending 180 degree time, then need this bending angle The bent buckling at place is modified except value, and except value, bent buckling corresponding for this bending angle is modified to 3.39mm, will This revised bent buckling removes value except value as the bent buckling that this bending angle is corresponding；B) it it is 90 degree when bending angle The internal layer sheet material of double-fold and constitute the both sides at this bending angle when all continuing bending 90 degree, then need this bending Bent buckling at angle is modified except value, and except value, bent buckling corresponding for this bending angle is modified to 3.3mm, will This revised bent buckling removes value except value as the bent buckling that this bending angle is corresponding；C) it it is 90 degree when bending angle When the outer layer sheet material of double-fold and a composition wherein Edge Bend 180 degree at bending angle, another side bending 90 degree, Then need the bent buckling to this folding corner to be modified except value, and bent buckling corresponding for this bending angle is repaiied except value It is being just 4.2mm, this revised bent buckling is being removed value except the bent buckling that value is corresponding as this bending angle；To being not required to Bent buckling corresponding to bending angle to be revised except value using the initial value in bending factor table as its bent buckling except value K_i； Then fundamental length sum L that length of run is all flangings between this any two points to be determined ' deduct institute The bent buckling having bending angle corresponding removes value K_iSum.

2. double-fold sheet metal component production method, it is characterised in that: comprise the following steps,

A, according to product parts figure, it is thus achieved that the fundamental length of all flangings between any two points to be determined it And L '；

The folding that B, all bending angles chosen in bending factor table between this any two points to be determined are corresponding Curved deduction value K, the bending situation occurred according to both sides, each bending angle in product parts figure during choosing judges Bent buckling corresponding to this bending angle except value is the need of correction, any one in bending angle is following three kinds of situations Need the bent buckling that doubling bent angle is corresponding to remove value when planting to be modified: a) when the double-fold that bending angle is 90 degree Internal layer sheet material and constitute this bending angle wherein while continue inverse bending 180 degree time, then need this bending angle The bent buckling at place is modified except value, and except value, bent buckling corresponding for this bending angle is modified to 3.39mm, will This revised bent buckling removes value except value as the bent buckling that this bending angle is corresponding；B) it it is 90 degree when bending angle The internal layer sheet material of double-fold and constitute the both sides at this bending angle when all continuing bending 90 degree, then need this bending Bent buckling at angle is modified except value, and except value, bent buckling corresponding for this bending angle is modified to 3.3mm, will This revised bent buckling removes value except value as the bent buckling that this bending angle is corresponding；C) it it is 90 degree when bending angle When the outer layer sheet material of double-fold and a composition wherein Edge Bend 180 degree at bending angle, another side bending 90 degree, Then need the bent buckling to this folding corner to be modified except value, and bent buckling corresponding for this bending angle is repaiied except value It is being just 4.2mm, this revised bent buckling is being removed value except the bent buckling that value is corresponding as this bending angle；To being not required to Bent buckling corresponding to bending angle to be revised except value using the initial value in bending factor table as its bent buckling except value K_i； Then fundamental length sum L that length of run is all flangings between this any two points to be determined ' deduct all Bent buckling corresponding to bending angle is except value K_iSum；

C, according to the length of run parameter blanking determined, it is thus achieved that the sheet metal of required specification；

D, according to product parts figure, sheet metal is carried out the panel beating of double-fold, it is thus achieved that required double-fold metal plate Gold part.

Double-fold sheet metal component production method the most according to claim 2, it is characterised in that: in above-mentioned steps D According to the length of run parameter between the arbitrfary point determined, sheet metal can be carried out corresponding panel beating before.