Small-size edge rolling terminal die

Abstract

The invention relates to a small-size edge rolling terminal die which is used for machining a material belt into a small-size edge rolling terminal and comprises a third pre-rolling die, the third edge rolling die comprises a third pre-rolling supporting block, a third pre-rolling punch and an elastic stripping block, a third pre-rolling groove is formed in the upper portion of the third pre-rolling supporting block, a third gap extending up and down is formed below the third pre-rolling groove, and a third gap extending up and down is formed below the third pre-rolling punch. The elastic stripping block is arranged in the third gap, when the elastic stripping block releases internal stress, the upper surface of the elastic stripping block is higher than the lowest point of the third pre-rolling groove, and a third convex ridge matched with the third pre-rolling groove is arranged at the bottom of the third pre-rolling punch. Compared with a rigid stripping block, the elastic stripping block can be processed into a thin sheet with a narrow thickness, but a good stripping effect can be achieved, stripping under a limited width becomes possible, and therefore it is ensured that a small-size edge rolling terminal can be formed.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping processing, and in particular to a small-sized rolled terminal die. Background Art

[0002] Terminals are hardware connectors used for electrical conduction or signal transmission. In order to generate a clamping force, some terminals have a curled structure.

[0003] Chinese patent CN116422777B discloses a die and method for processing folded riveted round tube wire terminals, which can produce terminals with a rolled structure. However, in this process, the outer diameter of the rolled structure is large relative to the thickness of the material strip, and deformation control is simple, without difficulty in stripping. Figure 1 and Figure 2 As shown, this terminal is a small-sized rolled terminal 1 with a very small rolled portion 14, with an outer diameter of only 0.4-0.6mm. This terminal is made from a flat strip of material through a series of punching, bending, and rolling processes. The strip thickness is only 0.15-0.2mm, and the material at the rolled portion 14 must be rolled nearly 360°, making it very difficult to control. Furthermore, the small size of the rolled portion 14 results in a limited stripping range, making it impossible to use conventional stripping blocks in the lower die, which prevents continuous stamping of the terminal.

[0004] Therefore, it is necessary to design a new molding method to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a small-sized rolled terminal mold, which can ensure the stripping effect and ensure that the small-sized rolled terminal can be formed.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: a small-sized rolled terminal mold, used to process the material strip into a small-sized rolled terminal, which includes a third pre-rolling mold, and the third rolling mold includes a third pre-rolling support block, a third pre-rolling punch and an elastic stripping block. The upper part of the third pre-rolling support block has a third pre-rolling groove, and the lower part of the third pre-rolling groove has a third gap extending up and down. The elastic stripping block is arranged in the third gap. When the elastic stripping block releases internal stress, its upper surface is higher than the lowest point of the third pre-rolling groove. The bottom of the third pre-rolling punch is provided with a third ridge that cooperates with the third pre-rolling groove.

[0007] Specifically, the depth of the third gap is 30-40% of the height of the third pre-roll supporting block, and the natural height of the elastic stripping block is 105-120% of the depth of the third gap.

[0008] Specifically, the small-size round terminal includes a connecting sheet, a V-shaped part, a large round part and a small round part connected in sequence, the large round part is coaxial with the small round part, the outer diameter of the large round part is 0.8-1mm, and the outer diameter of the small round part is 0.4-0.6mm; The mold further includes a first pre-rounding mold, a second pre-rounding mold, a third pre-rounding mold and a round mold, which are arranged in sequence. Before entering the first pre-rounding mold, the connecting band and the terminal blank are cut out on the material band, the connecting band is formed with a positioning hole, the terminal blank includes a first area for deforming into the V-shaped part, a second area for deforming into the large round part and a third area for deforming into the small round part, the terminal blank is a mirror-symmetrical structure with a mirror plane perpendicular to the conveying direction of the material band, and the connecting band, the first area, the second area and the third area are connected in sequence. The first pre-rounding mold is used to press the two sides of the second area into two first arc-shaped surfaces with an arc angle of 45°, the second pre-rounding mold is used to press the two sides of the second area into two second arc-shaped surfaces with an arc angle of 90° and the two sides of the third area into two third arc-shaped surfaces with an arc angle of 90°, the third pre-rounding mold is used to press the first area into the V-shaped part, the center of the second area into a fourth arc-shaped surface with an arc angle of 120° and the center of the third area into a fifth arc-shaped surface with an arc angle of 120°, and the round mold is used to deform the second area into the large round part with a circular cross section and deform the third area into the small round part with a circular cross section.

[0009] Specifically, the first round mold includes a first pre-rounding block, a first pre-rounding punch and a first rigid stripper, the upper part of the first pre-rounding block has a first pre-rounding groove, the lower part of the first pre-rounding groove has a first gap extending upward and downward, the first rigid stripper is floatingly arranged in the first gap, and the bottom of the first pre-rounding punch is provided with a first convex ridge matched with the first pre-rounding groove.

[0010] Further, the second round mold includes a second pre-rounding block, a second pre-rounding punch and a second rigid stripper, the upper part of the second pre-rounding block has a second pre-rounding groove, the lower part of the second pre-rounding groove has a second gap extending upward and downward, the second rigid stripper is floatingly arranged in the second gap, the bottom of the second pre-rounding punch is provided with a second convex ridge matched with the second pre-rounding groove, and the width of the second rigid stripper is smaller than that of the first rigid stripper.

[0011] Further, the lower mold of the mold is provided with a floating plate, and the first pre-rounding block, the second pre-rounding block and the third pre-rounding block vertically pass through the floating plate respectively.

[0012] Specifically, the large rolled portion is provided with two clamping thorns, and the third pre-rolling support block is provided with two avoidance grooves in the third pre-rolling groove for avoiding the clamping thorns.

[0013] The beneficial effects of the technical solution of the present invention are: The elastic stripping block of the present invention is simpler to process into a thin sheet of narrow thickness than the rigid stripping block, but can achieve a good stripping effect, making stripping under limited width possible, thereby ensuring that small-sized curled terminals can be formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the main perspective view of the terminal; Figure 2 It is the left view of the terminal; Figure 3 This is a top view of the structural changes of the material strip at the four stations: the first pre-rolling die, the second pre-rolling die, the third pre-rolling die, and the rolling die; Figure 4 The cross-sectional structural change diagram of the first area, the second area and the third area at four workstations; Figure 5 The figure is a diagram showing the local position relationship of the three pre-rolling dies; Figure 6 It is a three-dimensional diagram of the third pre-roll support block.

[0015] The following are marked in the figure: 1- small size curled terminal, 11- connecting piece, 12- V-shaped part, 13- large curled part, 131- clamping thorn, 14- small curled part; 2-die, 21-first pre-roll die, 211-first pre-roll support block, 2111-first pre-roll groove, 212-first pre-roll punch, 2121-first ridge, 213-first rigid stripper block, 22-second pre-roll die, 221-second pre-roll support block, 2211-second pre-roll groove, 222-second pre-roll punch, 2221-second ridge, 223-second rigid stripper block, 23-third pre-roll die, 231-third pre-roll support block, 2311-third pre-roll groove, 2312-avoidance groove, 232-third pre-roll punch, 2321-third ridge, 24-stripper plate; 3-material strip, 31-connecting strip, 32-terminal blank, 321-first area, 3211-fourth curved surface, 322-second area, 3221-first curved surface, 3222-second curved surface, 323-third area, 3231-third curved surface, 3232-fifth curved surface. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to specific embodiments.

[0017] Embodiment: As shown in Figure 1 , the small-size crimping terminal 1 comprises a connecting strip 11, a V-shaped part 12, a large crimping part 13 and a small crimping part 14 connected in sequence, the large crimping part 13 and the small crimping part 14 are coaxial, the outer diameter of the large crimping part 13 is 0.8-1mm, the outer diameter of the small crimping part 14 is 0.4-0.6mm, and the large crimping part 13 has two clamping spikes 131.

[0018] As shown in Figure 1 and Figure 2 , a small-size crimping terminal mold 2 is used to form the small-size crimping terminal 1. The mold 2 comprises a first pre-crimping mold 21, a second pre-crimping mold 22, a third pre-crimping mold 23 and a crimping mold arranged in sequence.

[0019] The small-size crimping terminal 1 is processed from a material strip 3. Before entering the first pre-crimping mold 21, the connecting strip 31 and the terminal blank 32 have been cut out on the material strip 3, the connecting strip 31 is formed with a positioning hole 311, the terminal blank 32 comprises a first area 321 for deforming into the V-shaped part 12, a second area 322 for deforming into the large crimping part 13 and a third area 323 for deforming into the small crimping part 14, the terminal blank 32 is a mirror-symmetrical structure with the mirror plane perpendicular to the conveying direction of the material strip 3, and the connecting strip 31, the first area 321, the second area 322 and the third area 323 are connected in sequence.

[0020] As shown in Figure 5 , the first pre-crimping mold 21 is used to press the two sides of the second area 322 into two first arc surfaces 3221 with an arc angle of 45°. The first pre-crimping mold 21 comprises a first pre-crimping block 211, a first pre-crimping punch 212 and a first rigid stripper 213, the upper part of the first pre-crimping block 211 has a first pre-crimping groove 2111, the lower part of the first pre-crimping groove 2111 has a first gap extending upward and downward, the first rigid stripper 213 is arranged in the first gap in a floating manner, and the bottom of the first pre-crimping punch 212 is provided with a first ridge 2121 matched with the first pre-crimping groove 2111.

[0021] The top of the first rigid stripper 213 is a flat surface used to contact the lower surface of the undeformed flat part of the second area 322. The first rigid stripper 213 and the first ridge 2121 are actually in a top-to-top relationship, and when the first ridge 2121 descends, it will pinch the middle part of the terminal blank 32 with the first rigid stripper 213, so as to fix the position of the second area 322. The first pre-crimping groove 2111 provides two forming surfaces closely contacting the first arc surfaces 3221. In the late stage of mold closing, the forming surfaces contact the side of the second area 322, so that it is slightly crimped, and the theoretical radius of the crimped part is close to the designed outer diameter of the large crimping part 13. When the mold is opened, the first rigid stripper 213 pushes against the middle part of the terminal blank 32 to rise, thereby realizing the stripping.

[0022] As Figure 4 and Figure 5 shown, the second pre-rolling die 22 is used to press the two sides of the second area 322 into two second arc-shaped surfaces 3222 with an arc of 90°, and press the two sides of the third area 323 into two third arc-shaped surfaces 3231 with an arc of 90°. The second pre-rolling die 22 comprises a second pre-rolling block 221, a second pre-rolling punch 222 and a second rigid stripper 223. The upper part of the second pre-rolling block 221 has a second pre-rolling groove 2211, and the lower part of the second pre-rolling groove 2211 has a second gap extending upward and downward. The second rigid stripper 223 is floatingly arranged in the second gap. The bottom of the second pre-rolling punch 222 is provided with a second ridge 2221 matched with the second pre-rolling groove 2211. The width of the second rigid stripper 223 is smaller than the width of the first rigid stripper 213.

[0023] The second pre-rolling die 22 is similar in structure to the first pre-rolling die 21, and the working principle is also similar. The same parts will not be described again. The difference between the first pre-rolling and the second pre-rolling is that the arc of the deformation area of the second area 322 is larger, so the area of the deformation area is also increased, and therefore the supporting width provided by the second rigid stripper 223 is smaller than the width of the first rigid stripper 213. Here, the third area 332 is not pre-rolled by 45°, but directly pre-rolled by 90°, because the area of the third area 332 is already very small, and there is no much space for accurate control here.

[0024] As Figure 4 to Figure 6 shown, the third pre-rolling die 23 is used to press the first area 321 into the V-shaped part 11, press the center of the second area 322 into a fourth arc-shaped surface 3223 with an arc of 120°, and press the center of the third area 323 into a fifth arc-shaped surface 3232 with an arc of 120°. The third pre-rolling die 23 comprises a third pre-rolling block 231, a third pre-rolling punch 232 and an elastic stripper 233. The upper part of the third pre-rolling block 231 has a third pre-rolling groove 2311, and the lower part of the third pre-rolling groove 2311 has a third gap extending upward and downward. The elastic stripper 233 is arranged in the third gap. When the elastic stripper 233 releases internal stress, the upper surface thereof is higher than the lowest point of the third pre-rolling groove 2311. The bottom of the third pre-rolling punch 232 is provided with a third ridge 2321 matched with the third pre-rolling groove 2211.

[0025] The width of the third pre-roll groove 2311 is the smallest among the three pre-roll grooves, which results in the width of the third gap being extremely narrow (less than 0.5 mm). If a rigid stripper block is used here, the strength will not be enough. Therefore, an elastic stripper block 233 is used here instead. Before the mold is closed, the elastic stripper block 233 will naturally extend in the height direction to lift the terminal blank 32 until the third ridge 2321 presses down the terminal blank 32. Because the third ridge 2321 is to be inserted into the C-shaped structure of the terminal blank 32 and cause its central area to deform in an arc shape, the terminal blank 32 must also leave a small opening angle (about 60°). When the mold is closed, the elastic stripper block 233 will be compressed when surrounded by the third gap, and the elastic force will gather inside. When the mold is opened, the elastic force of the elastic stripper block 233 is released, so that the terminal blank 32 can be lifted up again. The elastic stripping block 233 is simpler to process into a thin sheet of narrow thickness than the rigid stripping block, but it can achieve a good stripping effect, making stripping under limited width possible, thereby ensuring that the small-sized curled terminal 1 can be formed.

[0026] The depth of the third gap is 30-40% of the height of the third pre-roll supporting block 231 , and the natural height of the elastic stripping block 233 is 105-120% of the depth of the third gap.

[0027] The third gap is the accommodating space of the elastic stripping block 233. In order to allow the elastic stripping block 233 to have sufficient expansion and contraction, the depth of the third gap cannot be less than 30% of the height of the third pre-roll support block 231; the two sides of the third gap are columnar structures, and the two columnar structures are connected as a whole through the material of the third pre-roll support block 231. If the depth of the third gap is too large, the lower connection area of ​​the third pre-roll support block 231 will become smaller, and the two columnar structures cannot maintain a uniform gap relationship well, and the strength is insufficient. When subjected to the reaction force of the terminal blank 32 to both sides, the third pre-roll support block 231 will break.

[0028] like Figure 6 As shown, the third pre-roll supporting block 221 is provided with two avoidance grooves 2312 in the third pre-roll groove 2311 for avoiding the blocking thorns 131 .

[0029] The thorn 131 is actually pressed out on the second area 322 before the first pre-rolling. In order to retain the thorn 131 on the small-sized round terminal 1, the third pre-rolling support block 221 should use the avoidance groove 2312 to avoid the position.

[0030] like Figure 4 As shown, the lower mold of the small-size round terminal mold 2 is provided with a floating plate 24 , and the first pre-rolling support block 211 , the second pre-rolling support block 221 and the third pre-rolling support block 231 vertically pass through the floating plate 24 respectively.

[0031] The floating plate 24 has a stripping effect (on the position of the connecting belt 31). Three through holes are present on the floating plate 24, through which the first pre-rolling supporting block 211, the second pre-rolling supporting block 221 and the third pre-rolling supporting block 231 pass, so that the first pre-rolling supporting block 211, the second pre-rolling supporting block 221 and the third pre-rolling supporting block 231 balance the lateral force in the lifting process. In particular, the elastic stripping block 233 has a tendency to be stretched in the width direction after being compressed in the length direction, so that the spacing between the above two columnar structures is stretched. The through hole through which the third pre-rolling supporting block 231 passes can clamp both sides of the columnar structure to resist such deformation, thereby improving the service life of the third pre-rolling supporting block 231.

[0032] As shown in Figure 3 The round die is used to deform the second area 322 into the large round part 12 with a circular cross section, and deform the third area 323 into the small round part 13 with a circular cross section.

[0033] The structure of the round die here adopts a conventional punch structure with upper and lower semicircular grooves. On the basis of the structure of the third pre-rolling, only the outer periphery of the material is formed by clamping.

[0034] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A small-size rolled terminal die, used to process a strip into a small-size rolled terminal, characterized by: It includes a third pre-rolling die, and the third rolling circular die includes a third pre-rolling support block, a third pre-rolling punch and an elastic stripping block. The upper part of the third pre-rolling support block is provided with a third pre-rolling groove, and the lower part of the third pre-rolling groove is provided with a third gap extending up and down. The elastic stripping block is arranged in the third gap. When the elastic stripping block releases internal stress, its upper surface is higher than the lowest point of the third pre-rolling groove. The bottom of the third pre-rolling punch is provided with a third ridge that cooperates with the third pre-rolling groove.

2. The small-size curled terminal mold according to claim 1, characterized in that: The depth of the third gap is 30-40% of the height of the third pre-roll supporting block, and the natural height of the elastic stripping block is 105-120% of the depth of the third gap.

3. The small-size curled terminal mold according to claim 1, characterized in that: The small-size curled terminal includes a connecting piece, a V-shaped portion, a large curled portion, and a small curled portion connected in sequence. The large curled portion and the small curled portion are coaxial. The outer diameter of the large curled portion is 0.8-1 mm, and the outer diameter of the small curled portion is 0.4-0.6 mm. The mold further comprises a first pre-rolling mold, a second pre-rolling mold, a third pre-rolling mold and a rolling mold, wherein the first pre-rolling mold, the second pre-rolling mold, the third pre-rolling mold and the rolling mold are arranged in sequence; Before entering the first pre-rolling die, a connecting strip and a terminal blank have been cut out of the material strip, a positioning hole is formed on the connecting strip, and the terminal blank includes a first area for deforming into the V-shaped portion, a second area for deforming into the large curled portion, and a third area for deforming into the small curled portion. The terminal blank has a mirror-symmetrical structure and the mirror plane is perpendicular to the conveying direction of the material strip. The connecting strip, the first area, the second area, and the third area are connected in sequence; The first pre-rolling die is used to press the two sides of the second area into two first curved surfaces with an arc of 45°; the second pre-rolling die is used to press the two sides of the second area into two second curved surfaces with an arc of 90°, and to press the two sides of the third area into two third curved surfaces with an arc of 90°; the third pre-rolling die is used to press the first area into a V-shaped portion, press the center of the second area into a fourth curved surface with an arc of 120°, and press the center of the third area into a fifth curved surface with an arc of 120°; the rolling die is used to deform the second area into a large rolled portion with a circular cross-section, and to deform the third area into a small rolled portion with a circular cross-section.

4. The small-size curled terminal mold according to claim 3, characterized in that: The first rolling circular die includes a first pre-rolling support block, a first pre-rolling punch and a first rigid stripping block. The upper part of the first pre-rolling support block has a first pre-rolling groove, and the lower part of the first pre-rolling groove has a first gap extending up and down. The first rigid stripping block can be floated in the first gap, and the bottom of the first pre-rolling punch is provided with a first ridge that cooperates with the first pre-rolling groove.

5. The small-size curled terminal mold according to claim 4, characterized in that: The second rolling circular die includes a second pre-rolling support block, a second pre-rolling punch and a second rigid stripping block. The upper part of the second pre-rolling support block is provided with a second pre-rolling groove, and the lower part of the second pre-rolling groove is provided with a second gap extending up and down. The second rigid stripping block can be floated in the second gap, and the bottom of the second pre-rolling punch is provided with a second ridge that cooperates with the second pre-rolling groove. The width of the second rigid stripping block is smaller than that of the first rigid stripping block.

6. The small-size curled terminal mold according to claim 5, characterized in that: The lower mold of the mold is provided with a floating plate, and the first pre-roll supporting block, the second pre-roll supporting block and the third pre-roll supporting block vertically pass through the floating plate respectively.

7. The small-size curled terminal mold according to claim 3, characterized in that: The large rolled portion is provided with two clamping thorns, and the third pre-rolling support block is provided with two avoidance grooves in the third pre-rolling groove for avoiding the clamping thorns.

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