CN104353691A - Z type sensing finger one-molded die for high-voltage switch - Google Patents

Abstract

The invention relates to a Z type sensing finger one-molded die for a high-voltage switch. The mould is characterized by comprising an one-molded upper convex die and an one-molded lower concave die with an one-molded die cavity, wherein the one-molded die cavity comprises a left molded cavity, a right molded cavity and a bent-molded cavity which is connected between the left molded cavity and the right molded cavity and is matched with the shape of a bent part of a corresponding Z type sensing finger; the bottoms of the left molded cavity and the right molded cavity are both arranged horizontally. Through the adoption of the die disclosed by the invention, the problem that the one-molded brake forming angle of the Z type sensing finger is too big to be easy to cause rebound is solved.

Description

One-time molding mold for Z-shaped contact fingers for high-voltage switches

technical field

The invention relates to a one-time molding die for a Z-shaped contact finger for a high-voltage switch.

Background technique

Z-type contact finger is a key component in high-voltage switching electrical products such as circuit breakers and GIS. Its design and processing quality directly affect the arc-extinguishing performance of the switch. In addition to design factors, the performance of the Z-shaped finger mainly depends on the material and processing quality of the finger. The structure of the Z-shaped finger is shown in Figure 12: the Z-shaped finger 45 includes the finger body, and the middle part of the finger body has a In the bent part 45-1, a left blind hole 45-2 is provided on the underside of the left end of the stylus body, and a right blind hole 45-3 is provided on the underside of the right end of the stylus body, and the axis extension directions of the left and right blind holes intersect obliquely. Two tabs 45-4 are arranged symmetrically on the front and back sides of the finger body. At present, the Z-type contacts used in my country's high-voltage switches are all imported from abroad, the procurement cycle is long, and the cost of parts is high, which brings a lot of inconvenience to the long-term development of my country's high-voltage electrical industry.

The production of Z-type contacts has always been a technical problem in this field. The material of Z-type contacts is copper. Copper is a metal with a face-centered cubic lattice without allotropic transformation. It has high plasticity and is suitable for extrusion. Compression molding. From the analysis of the manufacturability of the parts, it can be seen that the three key parts of the forming of the parts are the left and right blind holes, the curved part in the middle and the symmetrically distributed lugs on both sides. From the appearance, the process is not complicated, but due to the The volume is small, the axes of the two blind holes have a certain angle, and the blind holes and lugs have precision requirements. Analysis of the flow of metal in the cavity shows that the filling of the two ends of the stylus body mainly depends on the blind hole. The transfer of metal in the hole, the filling of the lugs on both sides is partly the transfer of the metal in the right blind hole, and part of it is the transfer of the metal in the left blind hole. From the analysis of the metal flow path, it is difficult to transfer the metal in the right blind hole to the ear. It is relatively large, so the filling of the lug mainly depends on the metal transfer at the left blind hole, so the forming of the part is difficult. In addition, if the workpiece is bent and formed at a large angle, the copper workpiece will have bending springback, resulting in It is difficult to guarantee the design shape and performance requirements of the Z-type finger.

Contents of the invention

The object of the present invention is to provide a one-time molding die for Z-shaped contact fingers for high-voltage switches, so as to solve the springback problem easily caused by the excessively large primary bending angle of the Z-shaped contact fingers.

In order to solve the above problems, the technical solution of the present invention is:

The one-time molding die for Z-type contact fingers for high-voltage switches includes a one-time forming upper punch and a one-time forming lower die with a one-time forming cavity. The one-time forming cavity includes a left forming cavity, a right forming cavity and connected to left and right forming The curved molding cavities between the cavities are adapted in shape to the curved parts of the corresponding Z-shaped contact fingers, and the bottoms of the left and right molding cavities are all set horizontally.

The cavity bottom of the left forming cavity is provided with a lower forming protrusion for forming the left blind hole of the Z-shaped contact finger, and the upper forming protrusion for forming the right blind hole of the Z-shaped contact finger is provided on the one-time forming upper convex mold.

The primary forming cavity also includes an ear forming cavity connected with the left forming cavity for forming the ears on both sides of the Z-shaped contact finger.

The underside of the lower die for one-time forming is provided with a lower backing plate for the lower die for one-time forming, and the lower die for one-time forming is equipped with a forming punch whose axis extends in the up-down direction, and the lower backing plate for the first-time forming die and the lower end of the forming punch are The stop fits to limit the downward movement of the forming punch, the lower forming projection being formed by the upper end of the forming punch.

The guide moving sleeve on the upper punch of the primary forming is equipped with a first edge-holding block whose lower end is used to contact and press-fit with the upper cavity of the primary forming cavity, and the upper punch of the primary forming is fixed on the upper die seat of the primary forming mold Above, between the upper die base of the primary forming mold and the first edge-holding block, there is a first edge-holding spring that exerts a downward force on the first edge-holding block.

The first guide rod is guided through the first blank holder spring and the upper mold base of the primary forming mold, the lower end of the first guide rod is fixed on the first blank holder block, and the upper end of the first guide rod is provided with an outer Turning edge, the primary forming mold cooperates with the valgus edge limit to limit the downward movement limit of the first guide rod relative to the upper die seat of the primary forming mold.

The beneficial effects of the present invention are: in order to avoid the problem that the Z-shaped contact finger is easily bent and rebounded due to an excessively large forming angle at one time, the forming process of the Z-shaped contact finger is divided into two steps. In the first step, the blank is extruded into an intermediate In the second step, the intermediate product is extruded into the final Z-shaped contact finger. The one-time molding die in the present invention is a forming die for extruding the blank into the intermediate product in the first step, because the left, The cavity bottom of the right molding cavity is set horizontally, so the bottom of the left end and the bottom of the right end of the middle part are horizontal, and the left end and right end of the middle part are connected by a bending part, and then only the middle part needs to be formed by using the secondary molding die The right end can be squeezed and bent. During the extrusion molding process of the billet by the molding die, there is no phenomenon that the bending angle is too large, so the springback problem of the metal can be effectively avoided.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the one-time molding die of the present invention;

Fig. 2 is a schematic diagram of cooperation between the intermediate product and the lower die in one shot in Fig. 1;

Fig. 3 is a schematic structural view of the punch on the one-time forming in Fig. 1;

Fig. 4 is the A-A direction sectional view of Fig. 3;

Fig. 5 is the structural representation of molding punch among Fig. 1;

Fig. 6 is a structural schematic diagram of a secondary molding die used in conjunction with a primary molding die;

Fig. 7 is a schematic diagram of cooperation between the Z-shaped contact finger and the lower die of secondary molding in Fig. 6;

Fig. 8 is a top view of the lower die of secondary molding in Fig. 7;

Fig. 9 is a schematic diagram of cooperation between the Z-shaped contact finger and the upper punch of the secondary molding in Fig. 6;

Fig. 10 is a top view of the punch on the overmolding in Fig. 9;

Fig. 11 is a schematic diagram of cooperation between the second edge-holding block and the Z-shaped contact finger in Fig. 6;

Fig. 12 is a schematic structural diagram of a Z-shaped contact finger in the present invention;

Fig. 13 is a diagram of the forming process of the Z-shaped contact finger in the present invention.

Detailed ways

The embodiment of the one-time forming mold of the Z-type contact finger for the high-voltage switch is shown in Figures 1 to 5 and Figures 12 and 13: the one-time forming mold includes a one-time forming upper punch 12 and a one-time forming lower die 8 with a one-time forming cavity, The primary molding lower die 8 is fixed on the primary molding die base 1 through the first fixing structure. The first fixing structure includes the primary molding die bushing 9 and the primary molding die sleeved on the periphery of the primary molding lower die 8 The fixed plate 6, the one-time forming die bushing 9 cooperate with the one-time forming lower die 8 taper surface, the one-time forming die bushing 9, and the one-time forming die fixing plate 6 are fixed on the lower mold seat of the one-time forming die by the hexagon socket head cap screw 2 1 on. The primary forming upper punch 12 is fixed on the primary forming upper mold base 16 through the primary forming punch fixing plate 14 and the primary forming punch upper lining plate 15, and the primary forming lower mold base is arranged with four first guides at intervals around the circumference. Column 19, four first guide sleeves 18 that are respectively guided and moved on the corresponding first guide column are arranged at intervals around the circumference on the upper mold seat of the one-time forming, and the peripheral guide and mobile sleeve of the upper punch of the one-time forming is provided with a lower end for matching with the first guide column. The upper cavity of the primary molding cavity is in contact with the first press-fitting first blanking block, and the first blanking block that applies a downward force to the first blanking block is provided between the upper die base of the primary molding mold and the first blanking block. A blank holder spring 13, a first guide rod 17 is installed between the upper die base of the primary forming mold and the first blank holder spring, the lower end of the first guide rod is fixed on the first clamp block, and the first guide rod The upper end of the upper end is provided with a valgus edge, and the primary forming mold is matched with the valgus edge to limit the downward movement limit of the first guide rod relative to the upper mold base of the primary forming mold. The connecting part and 11 are fixed to the working part 10 on the lower side of the connecting part by bolts, and the lower end of the working part is used to contact and press fit with the upper cavity edge of the primary molding cavity. The one-shot molding cavity includes a left molding cavity, a right molding cavity, and a curved molding cavity that is connected between the left and right molding cavities and is adapted to the shape of the curved portion 45-1 of the corresponding Z-shaped contact finger. The cavities of the left and right molding cavities The bottom is set horizontally, and the bottom of the left molding cavity is provided with a lower molding protrusion for forming the left blind hole 45-2 of the Z-shaped contact finger. The upper end of the forming punch 7 extending in the up and down direction constitutes, the upper forming punch 23 of the one-time forming has the upper forming protrusion 22 for forming the right blind hole 45-3 of the Z-shaped contact finger, and the forming cavity of the one-time forming also includes the left forming part. The cavity is connected with the ear forming cavity on both sides of the Z-shaped contact finger, which is adapted to the shape of the ears on both sides. It is used to form the ears 45-4 on both sides of the Z-shaped contact finger 45 before the ear forming. Item 3 in Figure 1 represents the push rod; Item 4 represents the first positioning pin; Item 5 represents the backing plate under the one-time molding die.

The structure of the secondary molding mold used in conjunction with the primary molding mold is shown in Figures 6 to 11: the secondary molding mold includes a secondary molding upper punch 31, a secondary molding lower die 28 for placing the intermediate product 20, and a In the part fixing structure on the left end of the fixed intermediate part 20, the secondary forming lower die 28 is fixed on the secondary forming die lower mold base 23 through the secondary forming die lower backing plate 25 and the secondary forming die fixing plate 26 , the secondary forming mold lower mold base 23, the secondary forming die lower backing plate 25 and the secondary forming die fixing plate 26 are equipped with locking bolts 24 whose axes extend in the up and down direction. The secondary forming upper punch is fixed on the secondary forming mold upper mold base 40 through the secondary forming punch fixing plate 32 and the secondary forming punch upper backing plate 34, and the secondary forming mold lower mold base is arranged at intervals around the circumference There are four second guide columns 44 , and four second guide sleeves 41 are arranged at intervals around the circumference of the secondary forming upper die holder to guide and move respectively and sleeve on the corresponding second guide columns. The part fixing structure includes a positioning protrusion arranged at the left end of the mold cavity of the lower die cavity of the secondary molding, which is positioned and matched with the left blind hole on the intermediate part. The part fixing structure also includes an elastic The crimping mechanism of the top pressure fit, the positioning rod 26 whose axis extends in the up and down direction is pierced on the lower die of the secondary forming, the positioning protrusion is formed by the upper end of the positioning rod 26, and the lower backing plate 25 of the secondary forming die is connected with the positioning rod 26. The lower end of the rod 26 stops and cooperates to limit the downward movement limit of the positioning rod. The blank-holding mechanism includes a second guide rod 30 fixed on the upper die base of the secondary molding die, whose guiding direction extends along the up-down direction. The press-fitted second clamping block 29, the second clamping spring 33 that exerts a downward force on the second clamping block is provided between the upper die base of the secondary molding die and the first clamping block. The cavity bottom 46 at the right end of the die cavity of the secondary forming lower die is a forming slope inclined to the horizontal direction, and the secondary forming upper convex die is used to contact and press fit with the upper right end of the intermediate product to deform the right end of the intermediate product To the pressing protrusion 47 attached to the molding slope. Item 35 among Fig. 7 represents the bolt that realizes secondary forming punch fixed plate 32, secondary forming punch upper backing plate 34 to be fixed on the die base 40 of secondary forming mold; Item 36 represents die handle; Item 38 and 43 represent Fastening screw; item 39 indicates second alignment pin; item 42 indicates stop.

That is to say, the Z-type contact finger for the high-voltage switch includes a primary molding die and a secondary molding die. In the primary molding cavity of the lower die, the upper mold seat of the primary molding mold drives the first blank holder and the upper punch to move down, and the working part of the first blank holder is first aligned with the mouth of the primary molding cavity. Contact top press fit to realize the sealing of the mouth of the primary forming cavity, which can prevent the metal from flowing out of the primary forming cavity when the billet is extruded, and ensure that the metal will fully fill the primary forming cavity, and then perform one-shot molding The upper mold base of the mold continues to move down. Since the position of the lower molding protrusion is higher, the left blind hole on the intermediate part is formed first. As the upper punch continues to move down in one molding, the metal filling at the left end is completed, and the ear is formed. , the right blind hole is formed, and the right end of the middle part 20 is also in a horizontal state. At this time, the blank is formed into a middle part. Compared with the final Z-shaped contact finger, the middle part is only the right end of the middle part. horizontal, while the right end of the Z-finger is slanted. Then in the second step, the secondary molding die is used to extrude the intermediate product, and the intermediate product is placed in the lower die of the secondary molding, and the positioning protrusion is mated with the left blind hole of the intermediate product. During the downward movement of the forming upper mold base, the second blank holder block of the blank holder mechanism presses the left upper end of the middle part, so the middle part is fixed through the positioning protrusion and the blank holder mechanism. As the secondary molding upper mold base continues to move down, the top pressure protrusion of the secondary molding upper punch presses the right end of the intermediate part to obliquely deform the right end of the intermediate part, and finally form a Z-shaped contact finger.

In the present invention, the forming of the Z-shaped contact fingers adopts distributed operations, and there is no large bending deformation part in each step, thereby avoiding the problem of metal springing; the first blank holder is in contact with the upper cavity edge of the primary forming cavity Seal fit, so as to prevent the metal from flowing out of the primary forming cavity during the extrusion process of the blank, and ensure that the metal can fill the primary forming cavity; when the left blind hole is formed, the flow of the metal also forms the lug, ensuring the metal flow The smoothness; the forming punch and the positioning rod are respectively detachable and assembled with the lower die of the primary forming and the lower die of the secondary forming, which is convenient for unloading. In other embodiments of the present invention: the heat preservation step can also be omitted; of course, no lubricant can be provided in the primary molding cavity; the forming punch and the primary molding lower die can also be integrally formed; The mold can also be integrally formed; the part fixing structure can also be a pressure plate fixed on the lower die of the secondary forming by bolts, and the left end of the intermediate part is fixed in the lower die of the secondary forming through the pressing plate.

Claims (6)

1. the one-time-shaped mould of Z-type fingertip used for high-voltage switch, it is characterized in that: comprise one-shot forming upper male mould and the one-shot forming lower cavity die with one-shot forming die cavity, one-shot forming die cavity comprise left forming cavity, right forming cavity and be connected between left and right forming cavity with the sweep shape adaptation of corresponding Z-type fingertip bend to die cavity, be all horizontally disposed with at the bottom of the chamber of left and right forming cavity.

2. one-time-shaped mould according to claim 1, is characterized in that: the compacted under be provided with at the bottom of the chamber of left forming cavity for the left blind hole of shaping Z-type fingertip is protruding, and one-shot forming upper male mould has the upper shaping projection of the right blind hole for shaping Z-type fingertip.

3. one-time-shaped mould according to claim 2, is characterized in that: one-shot forming die cavity also comprises the ear forming cavity processed of the both sides ear for shaping Z-type fingertip be connected with left forming cavity.

4. one-time-shaped mould according to claim 2, it is characterized in that: on the downside of described one-shot forming lower cavity die, be provided with one-shot forming die lower bolster, the forming convax mould that axis extends along the vertical direction is coated with in one-shot forming lower cavity die, one-shot forming die lower bolster coordinates with forming convax mould lower end block and moves down to limit forming convax mould, and described compacted under projection is made up of the upper end of described forming convax mould.

5. the one-time-shaped mould according to claim 1 ~ 4 any one, it is characterized in that: on described one-shot forming upper male mould, guiding movement is set with lower end for contacting the first flanging block pushing up press-fit with the epicoele opening's edge of one-shot forming die cavity, one-shot forming upper male mould is fixedly arranged on one-time-shaped mould upper bolster, is provided with the first flanging spring applying active force in downward direction to the first flanging block between one-time-shaped mould upper bolster and the first flanging block.

6. one-time-shaped mould according to claim 5, it is characterized in that: on described first flanging spring and one-time-shaped mould upper bolster, guiding is equipped with the first guide post, the lower end of the first guide post is fixed on described first flanging block, the upper end of the first guide post is provided with outer turning edge, and one-time-shaped mould moves down the limit with the spacing cooperation that turns edge with what limit the relative one-time-shaped mould upper bolster of the first guide post outward.