CN204710898U - And of Varying Depth roller die building mortion and And of Varying Depth roller die formation system - Google Patents
And of Varying Depth roller die building mortion and And of Varying Depth roller die formation system Download PDFInfo
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- CN204710898U CN204710898U CN201520439338.7U CN201520439338U CN204710898U CN 204710898 U CN204710898 U CN 204710898U CN 201520439338 U CN201520439338 U CN 201520439338U CN 204710898 U CN204710898 U CN 204710898U
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Abstract
The utility model provides a kind of And of Varying Depth roller die building mortion and And of Varying Depth roller die formation system, and And of Varying Depth roller die building mortion comprises bed die (4), forming rolls group (5), forming rolls group motion, base (6) and host computer; Described forming rolls group (5) is arranged at directly over described bed die (4), if described forming rolls group (5) comprises the forming rolls (5-1) of n passage; The shape angles of each passage forming rolls (5-1) of described forming rolls group (5) successively increases progressively from the first passage to final pass; The z value of every time forming rolls (5-1) can independently regulate.Advantage is: can according to the difformity of roll and bed die, the product of different in width, differing heights, different cross section is produced in design, and, for the identical product produced, also there is different height values, adaptability is stronger, effectively solves a roll forming difficult problem for the not only dark but also narrow height change section parts of cross sectional shape.
Description
Technical field
The utility model belongs to the And of Varying Depth roller die forming technique field in machining, is specifically related to a kind of And of Varying Depth roller die building mortion and And of Varying Depth roller die formation system.
Background technology
In recent years, variable-section roll-bending forming technique has become a hot research problem, particularly And of Varying Depth roll forming technology in roll forming field, in the dark narrow sheet metal components of shaping, have plurality of advantages.Wherein, dark narrow sheet metal components refers to: the sheet metal part highly comparatively large, width is less.
At present, successfully have developed several And of Varying Depth roll forming model machine both at home and abroad, but, existing And of Varying Depth roll forming technology is faced with problems, such as, due to part variable cross-section, district is different with the springback angle in uiform section district, makes the control of part forming precision become very complicated, at present, lack effective technological approaches to solve.
In addition, existing And of Varying Depth roll forming model machine in world wide, Collaborative Control when relating to multiaxis empty, the number of axle is in large scale, control complicated, in actual production process, face system cloud gray model instability, reliability is low, forming accuracy is limited and safeguard the problems such as complicated.
Utility model content
For the defect that prior art exists, the utility model provides a kind of And of Varying Depth roller die building mortion and And of Varying Depth roller die formation system, can effectively solve the problem.
The technical solution adopted in the utility model is as follows:
The utility model provides a kind of And of Varying Depth roller die building mortion, comprises bed die (4), forming rolls group (5), forming rolls group motion, base (6) and host computer;
Described bed die (4) is fixed on described base (6), and described bed die (4) has the grooving (4-1) identical with the shape for hat feature bottom shape that is formed; Further, the length of described grooving (4-1) is not less than the length of 2 times of forming units needed for shape for hat part that are formed;
In addition, the shape for hat part that is formed described in comprises U-shaped part and the left flanging that extends respectively to external symmetry from left and right two vertical edge of described U-shaped part and right flanging; Described left flanging and described right flanging have identical forming curve;
Then: described grooving (4-1) has end to end m shaping pilot trench, the length of each shaping pilot trench is identical with the length of forming unit needed for shape for hat part that is formed, and the groove outer geometric locus of each shaping pilot trench is consistent with the forming curve of the shape for hat part that is formed; Wherein, m value is for described grooving (4-1) length is divided by the integer value of the forming unit length needed for shape for hat part that is formed;
Described forming rolls group (5) is arranged at directly over described bed die (4), if described forming rolls group (5) comprises the forming rolls (5-1) of n passage; Wherein, n is natural number; Each described forming rolls (5-1) includes main forming roll (5-1-1) and is positioned at described main forming roll (5-1-1) left and right sides and higher than the left redundant roll (5-1-2) of described main forming roll (5-1-1) and right redundant roll (5-1-3); The shape angles of described forming rolls (5-1) refers to: the angle between the outer radial curved surface of described left redundant roll (5-1-2) and described main forming roll (5-1-1) axis; Meanwhile, be also the outer radial curved surface of described right redundant roll (5-1-3) and described main forming roll (5-1-1) axially between angle;
The shape angles of each passage forming rolls (5-1) of described forming rolls group (5) successively increases progressively from the first passage to final pass;
Described forming rolls group motion comprises x to motion and n z to motion; Host computer is connected to motion to motion and n z with described x respectively; Wherein, x is to the feedstock direction for the part that is formed; Z to in processing plane with x to vertical direction; Described x to motion for drive described forming rolls group (5) overall at x to movement, that is: when the overall x of described forming rolls group (5) is to movement, passage spacing between adjacent forming rolls (5-1) is fixed value, remains unchanged; Each z is to the forming rolls (5-1) of the unique corresponding passage of motion, for the independent z value regulating this passage forming rolls (5-1), that is: the independent vertical distance regulated between this passage forming rolls (5-1) and described bed die (4).
Preferably, when n is 5, described forming rolls group (5) is made up of the forming rolls (5-1) of 5 passages, and the shape angles of described forming rolls (5-1) is followed successively by 20 °, 40 °, 60 °, 80 ° and 90 ° from the first passage to the 5th passage.
Preferably, described forming rolls group motion comprises rack-and-pinion and lead screw pair; Described rack-and-pinion as described x to motion, described lead screw pair as described z to motion.
Preferably, also comprise: decoiling equipment (1), pay-off (2), uniform section roll forming device (3), shearing device, drawing mechanism and palletizing apparatus;
The utility model also provides a kind of And of Varying Depth roller die formation system, comprising: And of Varying Depth roller die building mortion, decoiling equipment (1), pay-off (2), uniform section roll forming device (3), shearing device, drawing mechanism and palletizing apparatus;
Before And of Varying Depth roller die building mortion, by plate throughput direction, set gradually described decoiling equipment (1), described pay-off (2) and described uniform section roll forming device (3);
After And of Varying Depth roller die building mortion, by plate throughput direction, set gradually described shearing device, described drawing mechanism and described palletizing apparatus.
The And of Varying Depth roller die building mortion that the utility model provides and And of Varying Depth roller die formation system have the following advantages:
(1) can according to the difformity of roll and bed die, the product of different in width, differing heights, different cross section is produced in design, and for the identical product produced, also have different height values, adaptability is stronger.
(2) the utility model effectively can solve a roll forming difficult problem for the not only dark but also narrow height change section parts of cross sectional shape; Also reduce servo-controlled number of axle scale, use traditional mechanical mechanism to be shaped, make control system become simple, thus improve the reliability of system cloud gray model, conveniently system is safeguarded.
Accompanying drawing explanation
The perspective view of the And of Varying Depth roller die building mortion that Fig. 1 provides for the utility model;
Fig. 2 is the rough schematic view of Fig. 1;
The structural representation of the forming rolls that Fig. 3 provides for the utility model;
Fig. 4 is the rough schematic view of Fig. 3;
The side structure schematic diagram of the And of Varying Depth roller die building mortion that Fig. 5 provides for the utility model;
Fig. 6 is the rough schematic view of Fig. 5;
The complete perspective view of the And of Varying Depth roller die formation system that Fig. 7 provides for the utility model;
The top view of the And of Varying Depth roller die formation system that Fig. 8 provides for the utility model;
The side view of the And of Varying Depth roller die formation system that Fig. 9 provides for the utility model;
When Figure 10 is for being provided with 5 passage forming rolls, the variable cross-section forming process schematic diagram in certain cross section of U-shaped component.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in detail:
The utility model provides a kind of And of Varying Depth roller die building mortion, And of Varying Depth roller die formation system and manufacturing process, core concept is: the distance between every time forming rolls and bed die of forming rolls group can independently be regulated, thus the effective roll forming difficult problem solving the not only dark but also narrow variable cross-section part of cross sectional shape.Adopt bed die, can ensure the forming accuracy of part, the product quality that variable-section roll-bending is shaped is greatly improved.In addition, also there is the high advantage of production efficiency.
Composition graphs 1 and Fig. 2, be the schematic diagram of the And of Varying Depth roller die building mortion that the utility model provides, And of Varying Depth roller die building mortion comprises bed die 4, forming rolls group 5, forming rolls group motion, base 6 and host computer;
Bed die 4 is fixed on base 6, and bed die 4 has the grooving 4-1 identical with the shape for hat feature bottom shape that is formed; Further, the length of grooving 4-1 is not less than the length of 2 times of forming units needed for shape for hat part that are formed;
In addition, the shape for hat part that is formed comprises U-shaped part and the left flanging that extends respectively to external symmetry from left and right two vertical edge of U-shaped part and right flanging; Left flanging and right flanging have identical forming curve;
Then: grooving 4-1 has end to end m shaping pilot trench, the length of each shaping pilot trench is identical with the length of forming unit needed for shape for hat part that is formed, and the groove outer geometric locus of each shaping pilot trench is consistent with the forming curve of the shape for hat part that is formed; Wherein, m value is for grooving 4-1 length is divided by the integer value of the forming unit length needed for shape for hat part that is formed; Such as, grooving length is 10, and the forming unit length needed for shape for hat part that is formed is 3, then m value is 3.
Forming rolls group 5 is arranged at directly over bed die 4, is set as the forming rolls 5-1 that shape roll stacks 5 comprises n passage; Wherein, n is natural number; The forming rolls of n passage immobilizes along x to distance, and that is, when shaping roll stacks is along x to when moving, in the x direction, the forming rolls 5-1 of each passage carries out synchronous x to motion;
Structural reference Fig. 3 of each forming rolls 5-1, includes main forming roll 5-1-1 and is positioned at the main forming roll 5-1-1 left and right sides and higher than the left redundant roll 5-1-2 of main forming roll 5-1-1 and right redundant roll 5-1-3; The shape angles of forming rolls 5-1 refers to: the angle between the outer radial curved surface of left redundant roll 5-1-2 and main forming roll 5-1-1 axis; Meanwhile, be also the outer radial curved surface of right redundant roll 5-1-3 and main forming roll 5-1-1 axially between angle;
The shape angles of each passage forming rolls 5-1 of forming rolls group 5 successively increases progressively from the first passage to final pass; Such as, in FIG, n is 5, that is: forming rolls group 5 is made up of the forming rolls 5-1 of 5 passages, and the shape angles of forming rolls 5-1 is followed successively by 20 °, 40 °, 60 °, 80 ° and 90 ° from the first passage to the 5th passage.
Forming rolls group motion comprises x to motion and n z to motion; Host computer is connected to motion to motion and n z with x respectively; Wherein, x is to the feedstock direction for the part that is formed; Z to in processing plane with x to vertical direction; X is to motion for driving shaping roll stacks 5 entirety at x to movement, that is: when the overall x of forming rolls group 5 is to movement, the passage spacing between adjacent forming rolls 5-1 is fixed value, remains unchanged; Each z, to the forming rolls 5-1 of the unique corresponding passage of motion, for the independent z value regulating this passage forming rolls 5-1, that is: independently regulates the vertical distance between this passage forming rolls 5-1 and bed die 4.
In specific implementation, forming rolls group motion comprises rack-and-pinion and lead screw pair; Rack-and-pinion as x to motion, lead screw pair as z to motion.The concrete form of the utility model to forming rolls group motion does not limit.
In addition, with reference to figure 7-9, the And of Varying Depth roller die formation system that the utility model provides, comprising: And of Varying Depth roller die building mortion, decoiling equipment 1, pay-off 2, uniform section roll forming device 3, shearing device, drawing mechanism and palletizing apparatus;
Before And of Varying Depth roller die building mortion, by plate throughput direction, set gradually decoiling equipment 1, pay-off 2 and uniform section roll forming device 3;
After And of Varying Depth roller die building mortion, by plate throughput direction, set gradually shearing device, drawing mechanism and palletizing apparatus.
Based on aforementioned And of Varying Depth roller die formation system, the utility model also provides a kind of And of Varying Depth roller die manufacturing process, comprises the following steps:
Step 1: when needing sheet material forming to be width to be n1, when length is L1, left and right flanging has the component of the hat section of specific forming curve, computer reads the specific forming curve figure of the shape for hat part left and right flanging that is formed; Wherein, this specific forming curve figure is the equation of x and z; X is to the feedstock direction for the part that is formed; Z to in processing plane with x to vertical direction;
Step 2: make bed die 4, make bed die 4 have the grooving 4-1 identical with the shape for hat feature bottom shape that is formed; Wherein, the width of this grooving 4-1 is n1; The length of this grooving 4-1 is L2, then: L2 is not less than 2 times of L1; If L2 is m divided by the integer of L1, then make grooving 4-1 have end to end m shaping pilot trench, the length of each shaping pilot trench is L1, and the groove outer geometric locus of each shaping pilot trench is consistent with specific forming curve; By mass transport direction, m shaping pilot trench is designated as successively the 1st shaping pilot trench, the 2nd shaping pilot trench ... m shaping pilot trench;
Step 3: build And of Varying Depth roller die formation system, that is: by sheet material throughput direction, set gradually decoiling equipment 1, pay-off 2, uniform section roll forming device 3, And of Varying Depth roller die building mortion, shearing device, drawing mechanism and palletizing apparatus;
For And of Varying Depth roller die building mortion, shaping roll stacks 5 is set directly over bed die 4, that is: make the main forming roll 5-1-1 of each forming rolls 5-1 be positioned at directly over the grooving 4-1 of bed die, wherein, the axial length of main forming roll 5-1-1 and the well width of grooving 4-1 suitable; Be set as shape roll stacks 5 to be made up of n forming rolls 5-1, its shape angles is respectively from the 1st passage to the n-th passage: α 1, α 2 ... α n;
Step 4: then, first carries out uncoiling by the sheet material of decoiling equipment 1 pair of rolling; By pay-off 2, the sheet material after uncoiling is transported to uniform section roll forming device 3 and carries out uniform section shaping, sheet material forming is end to end multiple U-shaped components 10 by uniform section roll forming device 3 successively, by shaping sequencing, be designated as 1U shape component, 2U shape component successively Wherein, each U-shaped component includes the plane of structure being positioned at bottom and the left surface and the right flank that are positioned at the plane of structure left and right sides; The width of U-shaped component is n1, and length is L1;
Step 5: host computer controls shaping roll stacks 5 lifting by forming rolls group motion, makes forming rolls group 5 be separated with bed die 4; 1U shape component after step 4 is delivered in the 1st shaping pilot trench of bed die 4;
Step 6: PC control forming rolls group 5 towards the motion of 1U shape component, that is: controls shaping roll stacks 5 and carries out x to motion; When the forming rolls of the 1st passage moves to directly over 1U shape component head position P1, host computer on the one hand, shaping roll stacks 5 is driven to carry out x to moving along 1U shape component, on the other hand, host computer also starts to carry out independent regulable control to the forming rolls of each passage in the position of z-axis, the forming rolls of each passage is drawn close to bed die 4, and near the grooving of bed die 4 and along the orbiting motion of bed die 4 in xz plane, be the shape for hat state meeting specific forming curve by the correspondence position bending of 1U shape component, concrete wrap direction is:
Suppose the forming rolls for any i-th passage, when it moves to the Pi position of 1U shape component, Pi is the x-axis coordinate that the forming rolls of the i-th passage moves to; Host computer reads Pi value in real time, and meanwhile, host computer reads specific forming curve, obtains the depth value z of shape for hat part in this position that be formed, if z value is zi; Groove outer geometric locus again due to the 1st shaping pilot trench is consistent with the forming curve of the shape for hat part that is formed, that is: the groove outer height of the 1st shaping pilot trench corresponding to Pi position of 1U shape component is also zi, therefore, when the forming rolls of the i-th passage drops to zi height, the groove outer of the 1st shaping pilot trench effect under, left redundant roll 5-1-2 by the outside bending of left surface at the Pi position of U-shaped component, wherein, bending angle equals the shape angles α i of this passage, and bending position is the position of zi; Meanwhile, right redundant roll 5-1-3 is by the outside bending of right flank at the Pi position of U-shaped component, and wherein, bending angle equals the shape angles α i of this passage, and bending position is the position of zi; Be the degree of depth by the Pi position bending of 1U shape component be thus zi, shape angles is the state of α i;
Step 7: the forming rolls of the 1st passage is moved to 1U shape component tail position P0 and after carrying out bending and forming to 1U shape component tail position P0, if now obtain the 1 half shape for hat component;
Then, by forming rolls group 5 lifting, forming rolls group 5 is separated with bed die 4; And control shaping roll stacks 5 along x to carrying out counter motion, make the forming rolls of the 1st passage be positioned at directly over the head end of the 2nd shaping pilot trench; Then, the 1 half shape for hat component is transported to the 2nd shaping pilot trench, and is positioned at after the 1 half shape for hat component and with the 1 half shape for hat component continuous print 2U shape component and is transported to the 1st shaping pilot trench;
Then, decline shaping roll stacks 5, meanwhile, on the one hand, host computer drives shaping roll stacks 5 at x to the head end moving to the 1st shaping pilot trench from the 2nd shaping pilot trench; On the other hand, host computer also starts to carry out independent regulable control to the forming rolls of each passage in the position of z-axis, the forming rolls of each passage is made to be the shape for hat state meeting the component setup parameter that is formed successively by the correspondence position bending of component, detailed process is: be the 1st shape for hat component by the 1 half shape for hat component forming, the final shape for hat component obtained after the 1st shape for hat component is shaping; Be the 2 half shape for hat component by 2U shape component forming;
When shaping roll stacks 5 moves to the head end of the 1st shaping pilot trench, continue feeding component length that is formed again, 3U shape component is made to be transported to the 1st shaping pilot trench, and the 2 half shape for hat component is transported to the 2nd shaping pilot trench, and the roll stacks 5 that is shaped turns back to directly over the 2nd shaping pilot trench, each U-shaped component forming is constantly shape for hat component by so constantly circulation;
In the utility model, for the U-shaped component obtained that formalizes through uniform section forming unit, by the independent z value controlling each forming rolls group in shaping roll stacks in real time, be hat by each cross section of U-shaped component in different depth bending, but, for each cross section of U-shaped component, all by the effect of each passage forming rolls, be configured as 90 degree in certain depth, essence is a gradual change cross section forming process.
Such as, as shown in Figure 7, during for being provided with 5 passage forming rolls, the variable cross-section forming process schematic diagram in certain cross section of U-shaped component; As can be seen from Figure 7, this cross section of U-shaped component, first by the 1st passage forming rolls, through the effect of 1 passage forming rolls, makes the left surface of U-shaped component and right flank respectively to the position of outer bending to 20 °, obtains the state that shape angles is 20 °; Then, by the 2nd passage forming rolls effect, this cross section is formed into 40 °; By that analogy, according to this by the forming rolls of the 3rd passage to the 5th passage, finally this cross section of this U-shaped component is formed into 90 degree.
Step 8: the tail end of bed die exports each shape for hat component that step 7 obtains, and successively through shearing device, drawing mechanism and palletizing apparatus process, obtains multiple shape for hat component independently separated.
In sum, And of Varying Depth roller die building mortion, And of Varying Depth roller die formation system and manufacturing process that the utility model provides, have the following advantages:
(1) distance between every time forming rolls and bed die of forming rolls group is made independently to regulate, thus the effective roll forming difficult problem solving the not only dark but also narrow variable cross-section part of cross sectional shape.
(2) bed die is adopted, bed die is formed by multiple identical shaping pilot trench is end to end, and, the groove outer geometric locus of each shaping pilot trench is consistent with the forming curve of the shape for hat part that is formed, therefore, under the effect of bed die, can ensure the forming accuracy of part, the product quality that variable-section roll-bending is shaped is greatly improved.In addition, also there is the high advantage of production efficiency.
The above is only preferred embodiment of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should look protection domain of the present utility model.
Claims (4)
1. an And of Varying Depth roller die building mortion, is characterized in that, comprises bed die (4), forming rolls group (5), forming rolls group motion, base (6) and host computer;
Described bed die (4) is fixed on described base (6), and described bed die (4) has the grooving (4-1) identical with the shape for hat feature bottom shape that is formed; Further, the length of described grooving (4-1) is not less than the length of 2 times of forming units needed for shape for hat part that are formed;
In addition, the shape for hat part that is formed described in comprises U-shaped part and the left flanging that extends respectively to external symmetry from left and right two vertical edge of described U-shaped part and right flanging; Described left flanging and described right flanging have identical forming curve;
Then: described grooving (4-1) has end to end m shaping pilot trench, the length of each shaping pilot trench is identical with the length of forming unit needed for shape for hat part that is formed, and the groove outer geometric locus of each shaping pilot trench is consistent with the forming curve of the shape for hat part that is formed; Wherein, m value is for described grooving (4-1) length is divided by the integer value of the forming unit length needed for shape for hat part that is formed;
Described forming rolls group (5) is arranged at directly over described bed die (4), if described forming rolls group (5) comprises the forming rolls (5-1) of n passage; Wherein, n is natural number; Each described forming rolls (5-1) includes main forming roll (5-1-1) and is positioned at described main forming roll (5-1-1) left and right sides and higher than the left redundant roll (5-1-2) of described main forming roll (5-1-1) and right redundant roll (5-1-3); The shape angles of described forming rolls (5-1) refers to: the angle between the outer radial curved surface of described left redundant roll (5-1-2) and described main forming roll (5-1-1) axis; Meanwhile, be also the outer radial curved surface of described right redundant roll (5-1-3) and described main forming roll (5-1-1) axially between angle;
The shape angles of each passage forming rolls (5-1) of described forming rolls group (5) successively increases progressively from the first passage to final pass;
Described forming rolls group motion comprises x to motion and n z to motion; Host computer is connected to motion to motion and n z with described x respectively; Wherein, x is to the feedstock direction for the part that is formed; Z to in processing plane with x to vertical direction; Described x to motion for drive described forming rolls group (5) overall at x to movement, that is: when the overall x of described forming rolls group (5) is to movement, passage spacing between adjacent forming rolls (5-1) is fixed value, remains unchanged; Each z is to the forming rolls (5-1) of the unique corresponding passage of motion, for the independent z value regulating this passage forming rolls (5-1), that is: the independent vertical distance regulated between this passage forming rolls (5-1) and described bed die (4).
2. And of Varying Depth roller die building mortion according to claim 1, it is characterized in that, when n is 5, described forming rolls group (5) is made up of the forming rolls (5-1) of 5 passages, and the shape angles of described forming rolls (5-1) is followed successively by 20 °, 40 °, 60 °, 80 ° and 90 ° from the first passage to the 5th passage.
3. And of Varying Depth roller die building mortion according to claim 1, is characterized in that, described forming rolls group motion comprises rack-and-pinion and lead screw pair; Described rack-and-pinion as described x to motion, described lead screw pair as described z to motion.
4. an And of Varying Depth roller die formation system, it is characterized in that, comprising: And of Varying Depth roller die building mortion, decoiling equipment (1), pay-off (2), uniform section roll forming device (3), shearing device, drawing mechanism and palletizing apparatus;
Before And of Varying Depth roller die building mortion, by plate throughput direction, set gradually described decoiling equipment (1), described pay-off (2) and described uniform section roll forming device (3);
After And of Varying Depth roller die building mortion, by plate throughput direction, set gradually described shearing device, described drawing mechanism and described palletizing apparatus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520439338.7U CN204710898U (en) | 2015-06-24 | 2015-06-24 | And of Varying Depth roller die building mortion and And of Varying Depth roller die formation system |
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|---|---|---|---|
| CN201520439338.7U CN204710898U (en) | 2015-06-24 | 2015-06-24 | And of Varying Depth roller die building mortion and And of Varying Depth roller die formation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105665487A (en) * | 2015-06-24 | 2016-06-15 | 北方工业大学 | Variable-height roller die forming device, variable-height roller die forming system and forming method |
| CN105904221A (en) * | 2016-06-22 | 2016-08-31 | 厦门翼竑工贸有限公司 | Frameless wiper blade sheet steel forming and cutting-off all-in-one machine |
-
2015
- 2015-06-24 CN CN201520439338.7U patent/CN204710898U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105665487A (en) * | 2015-06-24 | 2016-06-15 | 北方工业大学 | Variable-height roller die forming device, variable-height roller die forming system and forming method |
| CN105904221A (en) * | 2016-06-22 | 2016-08-31 | 厦门翼竑工贸有限公司 | Frameless wiper blade sheet steel forming and cutting-off all-in-one machine |
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