CN112588950B - Spring holding and carrying processing method - Google Patents

Abstract

The invention discloses a processing method of spring embracing. When processing spring embracing, the strip material is sent in by a feeder and then placed between a discharge plate and a lower template, and passes through the first punching station, the second Punching station, the third center blanking station, the fourth side blanking station, the fifth workpiece end bending station, the sixth workpiece preliminary pre-bending station, the seventh workpiece secondary The pre-bending station, the eighth workpiece preliminary rounding station, the ninth full-circle station, and the tenth workpiece connecting residual material cutting station cut the middle connecting residual material and both sides connecting residual material of the two workpieces in the belt material Finally, make the two workpieces drop through the blanking hole.

Description

Processing method of spring hugging

technical field

The invention belongs to the field of processing circular parts, and in particular relates to a processing method for spring wraps.

Background technique

As shown in FIG. 1 , the applicant has designed a spring armband, which has an assembly hole and two weight-reducing holes, and one end of the spring armband passes through the assembly hole to form a circular armband. At present, for this kind of circular workpiece, it is usually punched and rounded after blanking according to the unfolded size of the workpiece. This processing method has low forming efficiency and produces a lot of waste. In actual production, after the material is cut into strips, the material is fed to the progressive die through the automatic feeder, and after punching, edge trimming, and multiple pre-bending, a core rod is inserted into the pre-bent post through the cylinder. The hollow part of the workpiece is rounded, and finally the finished workpiece is trimmed and blanked (such as the Chinese patent application number 2013100324595).

It can be seen that the use of progressive dies to process circular workpieces has greatly improved efficiency. However, in the molding process of the above-mentioned workpieces, the core rods for the complete circle of the workpiece need to be fed through two cylinders. The rounding method is relatively complicated, and only one workpiece can be formed at a time, so the efficiency needs to be improved. At the same time, in the feeding process, the feeding rate of the strip is only controlled by the feeder, but not according to the length change after bending in each process. It is difficult to make the mold, and it is difficult to control the spacing and speed of each bending station.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a material-saving, simple rounding and precise processing method for spring wraps.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A method for processing a spring bag, the spring bag has an assembly hole and two weight-reducing holes, and one end of the spring bag passes through the assembly hole to form a circular bag, which is characterized in that it includes the following steps : S1, blanking, according to the unfolded length and shape of the spring to be prepared, use CAD to draw the layout of the spring hugging process, and then cut the metal plate according to the width of the drawn layout, the metal strip after cutting is Rectangular, the width is greater than the length of the expanded spring arms; each station in the layout diagram corresponds to two circular arms, and the width of each processing station is greater than the expanded width of the two spring arms; S2, the The metal strip is loaded into the automatic feeder, and one end of the metal strip is sent into the progressive die installed on the press machine through the automatic feeder; S3, the metal strip is passed through the automatic feeder from one side of the progressive die to the The other side goes through the following processes in turn: a. Punching, through the press, the punching punch on the upper die of the progressive die is driven to punch down, and after corresponding to the die on the lower die of the progressive die, punch out the weight-reducing hole and assemble Hole; when punching, it is divided into two stations for punching, and the punching punch and punching die on the two stations are symmetrically arranged along the width direction of the metal strip; b, after punching according to the expanded width and size of the spring hug When cutting the edge, the excess waste material in the middle and outside of the two spring embracing planes is punched successively to form two spring embracing expansion planes connected in the middle; c, two sides of the long sides of the two spring embracing planes Bending at the ends at the same time; d, respectively bending the two sides of the long side of the bent two springs to form two connected springs; e, bending the two springs The arc bending part is rounded, and the rounding is completed by the two stations of preliminary rounding and extrusion. During the initial rounding, the bending die insert of the upper die presses the workpiece to the lower die core of the lower die. After the end of the spring arm passes through the two assembly holes, the initial rounding is completed; when extruding a full circle, the sliding wedges on both sides of the lower mold core are pressed by the upper wedge of the upper mold to move towards each other, and the initial rounding is completed. The workpiece is extruded on both sides of the lower mold core to complete a full circle; f, the middle part of the two full-circle workpieces and the part connected to the strip material on both sides are cut with the cutting punch and the cutting die at the same time, so that The two workpieces fall from the die discharge hole of the cutting die; while cutting the connecting part in the middle of the two workpieces, pass through the unloading plate in the upper die and a set in the middle of the cutting die and connect with the connecting part of the two workpieces. The waste jacking nails at the corresponding positions push out the sheet material at the joint between the two workpieces, and drop it from the discharge hole of the cutting die. In this way, first draw the layout diagram according to the workpiece development diagram and the workpiece shape, and then punch the metal strip, trim the edge, bend the end, pre-bend twice, initially bend the circle, and cut the joint after the full circle. The workpiece is dropped from the discharge hole, the forming speed of the workpiece is fast, and the degree of automation is high. At the same time, during sample layout, the workpiece is punched twice, and three holes are punched for each workpiece. This method of punching twice can effectively reduce the impact on the strip material during the punching process and reduce the risk of stripping. The amount of deformation during the stamping process is beneficial to ensure the strength of the strip material after punching. At the same time, the directions of the three holes are completely opposite, which can effectively ensure the least expected removal after layout and trimming, effectively reduce the generation of waste, and further reduce the processing cost of the bag. When cutting the edge, first cut the excess edge material in the middle of the two workpieces, and then cut the excess edge material on both sides, so that the expanded shape of the two workpieces can be formed after two cuts, and the cutting efficiency is high. The curvature of the workpiece is formed by preliminary bending and full circle. When the initial bending is performed, the pre-bent workpiece is punched downward through the bending die insert, held at one end of the mandrel, and passed through the assembly hole to form an irregular circle. When the shape is round, the sliding wedge is squeezed by the oblique wedge, so that the two sliding wedges face each other to squeeze the irregular circular shape. After extrusion, it is completely fitted with the end of the mandrel to form a regular circular shape. This method of using the punch and the wedge to cooperate with the mandrel to complete the rounding process is simple and the molding quality is good.

Further, when punching, two guide holes are punched at intervals between the two processing stations, on the upper and lower sides along the length direction of the metal strip, and a plurality of guide holes are arranged in the progressive die. One-to-one corresponding guide pins, the lower die of the progressive die is provided with perforations corresponding to the guide pins one by one, and the metal strips are aligned with the guide holes on the metal strips through the guide pins. The processing station conducts material guide positioning. In this way, after the metal strip is punched at equal intervals, the position of each station is controlled by the distance between two adjacent holes, and then the guide holes on the strip are matched with the guide pins in the progressive die. , can ensure that the guide pin corresponds to the guide hole during the continuous forward movement of the metal strip, and then ensure the displacement distance of each metal strip, so as to ensure that each processing station corresponds to the strip position correctly, and improve the machining accuracy of the workpiece.

Further, there are two rows of strip guiding devices for guiding the metal strip and lifting the processed metal strip back to the position in the lower mold. In this way, after the metal strip guide device is set, the metal strip will always move between the two rows of guide devices during the automatic feeding process of the metal strip by the automatic feeding mechanism, so as to ensure that the metal strip can be connected with each process after being fed. The processing punch and die in the position correspond to each other, thus ensuring the accuracy of processing.

Further, each row of strip guiding devices is composed of a plurality of floating lift pins arranged at intervals and consistent with the processing direction of the metal strip, and a ring is provided at the corresponding position of each floating lift pin and the metal strip to be processed. The slots, the annular slots of the two rows of floating top pins form a space for positioning the metal strip to be processed; a return spring is provided at the lower end of each floating top pin. When the upper mold in the mold is pressed down and moved up, the floating ejector pin lifts the metal strip for a certain distance under the jacking action of the return spring, so that the lower end of the metal strip returns to the initial processing height. In this way, after the upper mold presses the metal strip with the press, the metal strip is in close contact with the upper mold under the action of the downward pressure. At the same time, the pressed metal strip and the lifting pin move downward, and the return spring is compressed. After the processing of each station is completed, the press drives the upper mold to move upward, and there is no downward pressure on the metal strip, and then each floating jack pin returns to the initial height after the rebound of the return spring, so that the metal strip There is a certain distance between the lower end surface and the processing end surface of the lower die, so that the automatic feeding mechanism can drive the metal strip to continuously move to the next station. This method of lifting the metal strip by means of the lifting pin is simple to set up and can ensure a certain gap between the metal strip and the lower die, thereby facilitating the movement of the metal strip. At the same time, two rows of floating top pins are set, and after the metal strip is stuck in the annular slot of the two rows of floating top pins, the displacement direction of the metal strip can be effectively limited to ensure that the metal strip moves laterally, and after the movement, it can be connected with the Each station processing mold corresponding. And after the floating jack pins are arranged in two rows correspondingly, it can ensure that the lifting force of the metal strip material is balanced.

Further, the lower die core is a cylinder whose axial direction is consistent with the length direction of the metal strip, and a mounting seat parallel to it is provided at the lower end of the lower die core, and the mounting seat and the lower die core pass through A column is connected, and a plurality of grooves are arranged at intervals at the lower end of the installation seat, and a spring whose lower end goes deep into the lower end of the lower die is arranged in each groove. Like this, there is a spring at the lower end of the lower mold core. After the spring is added, when the upper mold has no pressure, it can cooperate with the spring installed under the lifting pin to lift the metal strip together with the workpiece and leave the die surface.

Further, the middle part of the cutting die has a hollow part, in the middle of the hollow part, there is a partition that divides the hollow part into a left blanking hole and a right blanking hole, and in the middle of the partition, there is a partition for A rectangular cutting knife that cuts off the middle connection of two workpieces. The upper end of the hollow part corresponds to the shape and size of the outer edge of the cutting punch, and the inner edge of the hollow part is a cutting edge; the cutting punch and the partition are arranged crosswise , at the lower end of the cutting punch, there is a groove that matches the partition of the cutting die, and the outer edge of the groove and the outer edge of the cutting die are cutting blades; The direction is set, a through hole is provided in the middle of the rectangular cutting knife and in the partition for the waste top nail to pass through, and a jacking spring is provided at the lower end of the waste top nail. In this way, the cutting die is divided into two parts by the partition, and the two hollow parts correspond to a processed workpiece respectively. At the same time, the connection part between the workpiece and the metal strip includes waste materials located on both sides of the workpiece and between the two workpieces, and the waste materials in the middle part The corresponding rectangular cutting knife is cut, and the waste on both sides is cut by the cutting blades of the cutting punch and the cutting die. After cutting, the waste materials on both sides fall through the hollow part with the cut workpiece at the same time, and the connection waste materials in the middle part pass through the rectangular cutting knife through the top nail and are pushed out, and then fall into the hollow part on one side. This setting can ensure that the two workpieces fall at the same time after cutting, and avoid the waste left on the cutting die after cutting, which will affect the next cutting.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the spring to be prepared in the embodiment;

Fig. 2 is the processing layout diagram of the spring hug in the embodiment;

Fig. 3 is a schematic diagram of the installation structure of the floating ejector pin and the pilot pin in the progressive die in the embodiment;

Fig. 4 is a schematic diagram of the pressing process of the end of the workpiece in the fifth station in the embodiment;

Fig. 5 is the schematic diagram of preliminary pre-bending processing of the workpiece in the sixth station in the embodiment;

Fig. 6 is the processing schematic diagram of secondary pre-bending of the workpiece in the seventh station in the embodiment;

Fig. 7 is the processing schematic diagram of the preliminary rounding of the workpiece in the eighth station in the embodiment;

Fig. 8 is a processing schematic diagram of the ninth station workpiece extruding a full circle in the embodiment;

Fig. 9 is a schematic diagram of the split structure of the cutting punch and the cutting die in the embodiment;

Fig. 10 is an enlarged schematic diagram of the installation structure of the cutting die in the embodiment.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example:

In the processing method of the spring wrap provided in this embodiment, the spring wrap has an assembly hole and two weight-reducing holes (as shown in Figure 1), and one end of the spring wrap passes through the assembly hole to form a circular Hold the bag, it is characterized in that, comprises the following steps: S1, blanking, according to the expanded length and the shape of the spring bag to be prepared, draw out the typesetting diagram (as shown in Figure 2) of the spring bag processing with CAD, and then according to the drawn The width of the layout diagram cuts the metal coil into a metal strip 1, and the cut metal strip 1 is rectangular, and the width is greater than the length after the spring is expanded; each station in the layout diagram corresponds to two circles Hold, and the width of each processing station is greater than the expansion width of the two springs; S2, put the metal strip 1 into the automatic feeder, and send one end of the metal strip 1 into the press machine through the automatic feeder In the progressive die on the top; S3, the metal strip is passed through the automatic feeder from one side of the progressive die to the other side in turn through the following processes: a, punching, the punching on the upper die of the progressive die is driven by the press The hole punch is punched downwards, and after corresponding to the die on the lower die of the progressive die, the weight-reducing hole and the assembly hole are punched out; when punching, two stations are used for punching, and the punching punch and the punching hole on the two stations The concave die is set symmetrically along the width direction of the metal strip; b, according to the expanded width and size of the spring wrap, the punched strip is trimmed. When cutting the edge, the excess waste in the middle and outside of the unfolded plane of the two spring wraps is punched out successively , to form two spring embracing unfolding planes connected in the middle; c, bending both ends of the long sides of the two spring embracing planes at the same time (as shown in Figure 4); The two sides of the long side of the spring embracing plane are bent (as shown in Figure 5 and Figure 6) to form two connected spring embracing curved parts; e, the two spring embracing curved parts are rounded, so The full circle is completed by the two stations of initial rounding and extrusion. During the initial rounding, the bending die insert of the upper die is used to press the workpiece onto the lower die core 7 of the lower die, so that the spring embraces the After one end passes through the two assembly holes, the preliminary rounding is completed (as shown in Figure 7); when extruding a full circle, the sliding wedges 6 on both sides of the lower mold core 7 are pressed by the upper inclined wedge 5 of the upper die to move toward each other, and the preliminary bending is completed. The rounded workpiece is extruded on both sides of the lower mold core to complete the circle (as shown in Figure 8); f, the middle part of the two rounded workpieces and the part connected to the belt material on both sides are simultaneously cut off by the punch 8 and the cut-off die 9 are matched and cut, so that the two workpieces fall from the die discharge hole of the cut-off die 9; Cut off the middle part of the die 9, and the waste top nail 10 at the corresponding position of the connected part of the middle parts of the two workpieces pushes out the joint part sheet material cut off by the two workpieces, and leaks down from the discharge hole of the cut die (as shown in Figure 9 and Fig. 10).

As shown in Figure 2, in this embodiment, the processing of the spring hugging during typesetting is completed by ten stations. The first station and the second station adopt the same punch and die, and they are all punched through punching dies. In cooperation with the punching die, two stations are used to punch out a total of six holes in the two workpieces. The third station is to punch out the connecting position of the middle part of the two workpieces, and punch out the excess material in the middle of the two workpieces. The fourth station is to punch out the remaining material on both sides of the workpiece. The fifth station is to punch out the two workpieces. The two ends are bent downwards, the sixth station is for preliminary pre-bending of the two workpieces, the seventh station is for secondary pre-bending of the two workpieces, the eighth station is for preliminary rounding of the two workpieces, The ninth station is to round the workpiece, and the tenth station is to cut the remaining material connecting the middle part of the two workpieces and the remaining material connecting the two sides in the belt, so that the two workpieces can be dropped through the blanking hole. After the third station, the fourth station to the ninth station are separated by a station distance and then the corresponding bending punches, bending dies, cutting dies and cutting punches are set. This design is mainly for guiding Pins, lifting pins and other components provide installation positions, and at the same time, ensure that the progressive die has sufficient strength.

When punching, between the two processing stations, along the upper and lower sides of the length direction of the metal strip 1, a plurality of guide holes 11 are punched at intervals, and a plurality of guide holes 11 are arranged in the progressive die. A corresponding guide pin 2, the lower die of the progressive die is provided with perforations corresponding to the guide pin 2 one by one, and the metal strip 1 corresponds to the guide hole on the metal strip through the guide pin. Conduct material guide positioning for each processing station. The pilot hole 11 is formed by punching two pilot punching punches arranged symmetrically at the first station.

There are also two rows of strip guide devices (as shown in Figure 3) that are used to guide the metal strip and lift the processed metal strip back to its position in the lower die. Each row of strip guiding devices is composed of a plurality of floating lift pins 3 arranged at intervals and consistent with the processing direction of the metal strip. A ring is provided at the position corresponding to each floating lift pin 3 and the metal strip 1 to be processed. The slots, each annular slot of the two rows of floating top pins 3 form a strip material forward positioning space for clamping the metal strip to be processed; a return spring 4 is provided at the lower end of each floating top pin 3, When the upper mold in the progressive die is pressed down and moved up, the floating ejector pin 3 lifts the metal strip 1 for a certain distance under the jacking action of the return spring 4, so that the lower end surface of the metal strip 1 returns to the initial processing height .

The lower mold core 7 is a cylinder whose axial direction is consistent with the length direction of the metal strip, and a mounting seat parallel to it is provided at the lower end of the lower mold core 7, and a The columns are matched and connected, and a plurality of grooves are arranged at intervals at the lower end of the mounting seat, and a spring whose lower end goes deep into the lower end of the die is arranged in each groove.

The cutting die 9 middle part in the present embodiment has a hollow part, is provided with a dividing plate 91 that divides the hollow part into left blanking hole and right blanking hole in the middle of this hollow part, is provided with in the middle part of dividing plate 91 One is used to cut off the rectangular cutting knife 92 of two intermediate connection parts, and the upper end of described hollow part is corresponding with cutting off punch 8 outer edge shape and size, and the inner edge of hollow part is cutting edge; Said cutting punch 8 It is intersected with the partition 91, and there is a groove at the lower end of the cutting punch 8 that matches the partition 91 of the cutting die 9. The groove cuts off the outer edge and the outer edge of the cutting die 9. Blade; the waste top nail 10 is arranged along the height direction of the partition 91, and a through hole for the waste top nail 10 is provided in the middle part of the rectangular cutting knife 92 and the partition 91, and the lower end of the waste top nail 10 is provided with One with jacking springs.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit the technical solutions. Although the applicant has described the present invention in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that those who understand the present invention Any modification or equivalent replacement of the technical solution of the invention without departing from the spirit and scope of the technical solution shall be covered by the scope of the claims of the present invention.

Claims (5)

1. A processing method for a spring bag, the spring bag has an assembly hole and two weight-reducing holes, and one end of the spring bag passes through the assembly hole to form a circular bag, which is characterized in that it includes The steps are as follows: S1, blanking, according to the unfolded length and shape of the spring wrap to be prepared, use CAD to draw the layout of the spring wrap, and then cut the metal coil into metal strips according to the width of the drawn layout (1 ), the metal strip material (1) after cutting is rectangular, and its width is greater than the length of the expanded spring arms; each station in the layout diagram corresponds to two circular arms, and the width of each processing station is greater than the expansion width of the two springs; S2, put the metal strip (1) into the automatic feeder, and send one end of the metal strip (1) into the progressive die installed on the press machine through the automatic feeder; S3, the metal strip is passed through the automatic feeder from one side of the progressive die to the other side in turn through the following processes: a, punching, through the press to drive the punching punch on the upper die of the progressive die to punch down, and the step After the concave die on the lower die of the die is matched, the weight-reducing hole and the assembly hole are punched out; when punching, two stations are used for punching, and the punching punch and the punching die on the two stations are along the width of the metal strip. The direction is set symmetrically; b, according to the expanded width and size of the spring arms, the edge of the punched strip material is cut. When cutting the edge, the excess waste material in the middle and outside of the two spring arms is successively punched to form two connected middle parts. The plane is unfolded by the spring embracing; c, the two ends of the long sides of the two spring embracing planes are simultaneously bent; d, the two sides of the long sides of the two spring embracing planes after bending are respectively bent twice to form Two connected spring embracing and bending arcs; e, complete the two spring embracing and bending arcs, and the full circle is completed by the two stations of preliminary bending and extruding the full circle. The bending die insert of the upper mold presses the workpiece onto the lower mold core (7) of the lower mold, so that one end of the spring arm passes through the two assembly holes and completes the initial rounding; the lower mold core (7) is A cylinder whose axial direction is consistent with the length direction of the metal strip is provided with a mounting seat parallel to it at the lower end of the lower die core (7). The mounting seat and the lower die core are connected by a column. The lower end of the seat is provided with a plurality of grooves at intervals, and each groove is provided with a spring whose lower end goes deep into the lower end of the lower die; when extruding a full circle, the lower die core ( 7) The sliding wedges (6) on both sides move towards each other, and squeeze the initially rounded workpiece on both sides of the lower mold core to complete a full circle; f, connect the middle part of the two rounded workpieces and the two sides with the The connecting part of the material is cut with the cutting punch (8) and the cutting die (9) at the same time, so that the two workpieces fall from the die discharge hole of the cutting die (9); At the same time, through the unloading plate in the upper mold and a waste ejector nail (10) set in the middle of the cutting die (9) and corresponding to the connecting part of the middle of the two workpieces, the sheet material at the joint part of the two workpieces is ejected. , and drop from the discharge hole of the cutting die. 2. The processing method of the spring wrap according to claim 1, characterized in that, when punching, between the two processing stations, the upper and lower sides along the length direction of the metal strip (1) are punched at intervals There are multiple guide holes (11), and multiple guide pins (2) corresponding to the guide holes are arranged in the progressive die, and guide pins (2) corresponding to the guide pins (2) are arranged on the lower die of the progressive die. ) one-to-one corresponding perforation, and the metal strip (1) guides and positions each processing station after the guide pin corresponds to the guide hole on the metal strip. 3. The processing method according to claim 1 or 2, characterized in that two rows of belts are provided in the lower mold for guiding the metal strip material and lifting the metal strip material back to its position after processing. material guiding device. 4. The processing method of spring hugging according to claim 3, characterized in that each row of tape guiding devices is composed of a plurality of floating ejector pins (3) arranged at intervals and consistent with the processing direction of the metal tape. Each floating jack pin (3) is provided with an annular slot corresponding to the position where the metal strip (1) to be processed is placed, and each annular slot of the two rows of floating jack pins (3) forms a There is a positioning space for the metal strip material to move forward; a return spring (4) is provided at the lower end of each floating ejector pin (3). 3) Under the lifting action of the return spring (4), the metal strip (1) is lifted for a certain distance, so that the lower end surface of the metal strip (1) returns to the initial processing height. 5. The processing method of spring wrap according to claim 1, 2 or 4, characterized in that, the middle part of the cutting die (9) has a hollow part, and a hollow part is arranged in the middle of the hollow part The partition (91) is divided into the left blanking hole and the right blanking hole, and a rectangular cutting knife (92) for cutting off the middle connection part of the two workpieces is arranged in the middle of the partition (91), and the upper end of the hollow part It corresponds to the shape and size of the outer edge of the cutting punch (8), and the inner edge of the hollow part is the cutting edge; the connection part between the workpiece and the metal strip includes waste materials located on both sides of the workpiece and between the two workpieces, and the middle part of the waste material corresponds to The rectangular cutting knife cuts, and the waste on both sides is cut by the cutting blades of the cutting punch and the cutting die; the waste top nail (10) is set along the height direction of the partition (91), and is in the middle of the rectangular cutting knife (92). , The dividing plate (91) is provided with a through hole for the waste material top nail (10) to wear, and the lower end of the waste material top nail (10) is provided with a jacking spring.

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