CN1270337C - Method for producing contact sheet of electric device connector - Google Patents

Abstract

The contact sheet is obtained by segmenting the secondary sheet (1) of the contact made of a metal strip (9) in which openings (2) are formed with an initial standard pitch (d ₁ ), to form a discontinuous center piece (CS) of the blade (3). Each of said blades is twisted to create an initial contact piece (10). The method further includes subjecting said primary sheet to pleating and quenching heat treatment. It is characterized in that it starts from the following operations: - Metallization is carried out on both sides of the strip (9) so that a metal layer belonging to a good conductor of electricity covers at least said central sheet (CS), on said strip (9) openings (2) are formed therein, and each of said blades (3) is twisted, and is also characterized in that it then comprises the following continuous operations: pleating said initial sheet (10), and then performing said quenching heat treatment, To form the secondary contact piece (1), the secondary piece is divided into a plurality of contact pieces.

Description

Contact piece for electrical equipment connector and method of manufacturing the same

technical field

The present invention relates to a method of manufacturing contact pieces of electrical equipment connectors, obtained by subdividing secondary pieces of contacts made of metal strips, in which metal strips with initial pitch (original pitch) are formed pitch) to form a discrete central piece of blade, the longitudinal ends of which are connected to two continuous edge pieces of the band, each of which is twisted about its longitudinal axis relative to the plane of the band Pivoted and bent so that each of its two surfaces has at least one raised area to form a contact point on one side of said plane, said twisting and bending operations form an initial contact piece, the blade of which Spaced at substantially the same regular pitch as the initial pitch of the openings, the method further includes pleating the initial contact pieces by forming pleats on each successive edge piece to move all The blades are brought closer together, the method also includes a quenching heat treatment to make the blades have a certain elasticity and hardness at the same time, so that they act as springs.

Background technique

The strips used in the above method disclosed in patent document FR2811147 are not necessarily metal strips. In practice, beryllium-based alloys are often preferred. The central part of one surface of the strip is covered with a metal layer which is a good conductor of electricity, eg silver. One edge of each blade is bent like a backing in such a direction that the conductive layer remains outside so that current can flow through the conductive layer between the two contacts of the blade. Therefore, this layer must be thick enough to have suitable conductive parts. The central portion of one face of the tape is usually covered with the conductive layer by a mechanical lamination operation and is therefore less elastic than the edge portion of the tape after heat treatment to harden the contact pads.

In the prior art method described above, the edge portions of the strips are not covered by the conductive layer so that they remain elastic after the heat treatment, which elasticity makes the blades act as springs. It may be noted that this necessity exists in other types of bladed contact pieces, such as the separately manufactured bladed piece disclosed in patent document FR2339259. It should be noted that if the connecting element exerts a pressure on the blade of the contact blade perpendicular to the plane of the blade, the blade must be able to pivot relative to this plane while exerting an elastic return force on the connecting element to provide reliable contact .

Furthermore, the pleating operation forms a contact sheet with a large number of lobes per unit length of the sheet. Since the edge portion of the strip is not covered, the pleating operation may produce one or more pleats, for example a single narrow pleat bent substantially parallel to the plane of the strip, as disclosed in the aforementioned patent FR2811147. Therefore, obtaining a high density of vanes along the length of the contact strips in this way should not be particularly difficult.

Although very satisfactory contact strips have been obtained, especially in terms of their ability to conduct large currents, especially in the order of 1000 amperes or more, which are often present in medium and high voltage installations, fall under the patents mentioned above The subject approach still has some deficiencies. First, it is difficult to pleat the edge of each blade like a liner, especially since the applied metal layer covering one surface of the edge must be thick enough for two opposing contacts on each blade Sufficient electrical conductivity is provided between the surfaces, which imposes a burden on manufacturing cost. Second, the mechanical lamination operation itself is relatively costly, especially compared to electrolytic galvanization operations.

One conventional method of manufacturing contact blades utilizes an electrolytic plating operation of the strips of the contact blades. In practice this operation is carried out at the end of the process, ie after the blades have been formed in each strip, the strips have been cut to the desired length for the contact sheet, and each cut strip has subsequently been After heat treatment such as annealing to impart the desired elastic properties on the blade. It should be noted that the edge portion of the strip has not undergone any pleating operation and that the finished contact piece is formed by two galvanized pieces of the same length inserted one into the other, as shown in patent document FR2100220. This doubles the number of vanes per unit length and achieves the required vane density for use in high current applications.

With the conventional methods described above, it would not be possible to achieve the same blade density on the contact blades of a single strip. Because the plating is done after the blades have been formed, the blades must never be brought too close together, as the metal layer then obtained by electrolytic plating has too irregular a thickness, especially since a phenomenon known as shadow cone affects the blades . A shadow cone is defined as the part of a blade that is located behind another blade in the direction of the plating electric field. Furthermore, the more vanes overlap in the direction perpendicular to the strip, the greater the risk of air bubbles being trapped during plating. Since it is difficult to thoroughly clean the strip inside the plating bath to expel trapped air bubbles, there is a risk that the continuity of the metal layer is locally severed. The conventional solution of embedding pairs of vane strips has therefore been adopted to ensure satisfactory plating of each vane.

However, this solution also has the disadvantage of relatively high costs. Also, in this method, it is desirable to cut the strips to the desired length prior to embedding a pair of already plated strips, since it is more difficult and costly to cut a pair of already-embedded strips. The resulting double-strip contact blades must therefore have different lengths corresponding to the size of the connectors for which they are to be used, which means that a large number of different parts must be stocked in order to be able to meet the requirements quickly. This solution therefore imposes a burden on storage costs and delivery times.

Contents of the invention

The object of the present invention is to overcome the disadvantages of the solutions of the prior art described above by proposing a solution which is particularly capable of meeting requirements quickly but which is less expensive to manufacture and store.

For this purpose, the invention provides a method of manufacturing a contact sheet as proposed at the outset, characterized in that it starts from the following three steps:

- metallizing on both sides of said metal strip so that at least said central sheet is covered by a metal layer which is a better conductor than the metal of said strip,

- forming said opening in said strip, and

- twisting and bending each of said blades,

and also consists in then including the following successive operations:

- pleating two consecutive edge pieces of said first piece of contact,

- subjecting the obtained contact sheet to said quenching heat treatment after the aforementioned operation to form said secondary contact sheet, and

- Dividing said secondary contact strips into a plurality of contact strips to be mounted on connectors having the required strip length for each connector.

The secondary contact blades can be obtained from long strips and loaded in the form of spools, for example cut into the contact blades by the client just before the blades are fitted into the connector.

Advantageously, the strip is metallized by electroplating. Plating is performed electrolytically, for example using silver. The strip to be plated may consist of an alloy of beryllium and bronze which is poorly conductive but very elastic after heat treatment. This is well known in the art. Heat treatment of beryllium bronze may include heating it to approximately 320° C. for four hours, followed by gradual cooling.

In a preferred embodiment of the method, all surfaces of the strip are covered during the metal plating operation. Especially with metal plating by electrolytic plating, and in the state of the art, plating the entire surface is much less costly than treating only the center piece of the strip.

In one embodiment of the method, openings are punched in the strip, i.e. are cut out using a punch and die fitted one into the other to form a relatively wide hole, said punching operation being performed prior to said punching operation. metal plating operations.

In a preferred embodiment of the method, during said pleating operation, said blades are moved closer together so that they are evenly spaced with a new standard pitch such that the initial pitch and The ratio between the new pitches is from 1.3 to 2. In the remainder of this description, this ratio is referred to as the blade proximity factor. There is a range of values for this ratio in which the new pitch corresponds to a sufficiently large blade density to guarantee performance in high current applications at least as high as that of contact blades made by the aforementioned prior art methods performance as well.

Further features and advantages of the manufacturing method according to the invention will be shown in more detail in the remainder of the description with reference to the drawings.

Finally, the invention also provides a contact piece for connecting electrical equipment, obtained from a metal strip in which openings are formed to form a discontinuous central piece of a blade, said contact piece being plated over its entire surface. There is a metal layer belonging to a good conductor of electricity, the longitudinal ends of the blades are connected to two consecutive edge pieces of the strip, the strip is bent with a transverse bend, the blades are evenly spaced with a standard pitch, touching The sheet is characterized in that each pleat has a height such that the ratio between said gauge pitch and said height is from 1.7 to 2.5. The spatial nature of each pleat in such a contact sheet is particularly advantageous in allowing a pleating operation which is relatively simple to perform and has no risk of damaging the conductive metal layer in the region of said continuous edge sheet of the strip. risk.

The contact lugs according to the invention are particularly advantageous from the point of view of the performance/cost trade-off if they are obtained by the production method according to the invention.

Description of drawings

Figures 1 to 3 show the steps of an embodiment of a method according to the invention for producing contact blades with a high blade density.

Figure 3a is a schematic diagram showing an alternative embodiment of transverse pleats in a blade strip.

Figure 4 is a schematic diagram showing a suitable blade shape for each of the two surfaces of the blade to have two contact surfaces.

FIG. 5 is a schematic diagram showing a cross-sectional portion of a contact blade mounted in a partial connector formed of a blade strip similar to that shown in FIG. 4 .

Fig. 6 is a schematic diagram showing a cross-sectional part of a contact strip similar to that shown in Fig. 5, where the contact strip is mounted on the connector part, including means for immobilizing the strip in the longitudinal direction.

Fig. 6a is a schematic diagram showing the apparatus shown in Fig. 6 in longitudinal section.

Detailed ways

FIG. 1 shows a metal strip 9 , which, as can be seen in FIG. 1 a , is covered on both surfaces with a metal layer 15 which is a good conductor of electricity. In the remainder of this specification, "a good conductor of electricity" means any metal that conducts electricity better than the metal of the strip. As can be seen in Figure 2, at least the center piece CS of the belt is covered by a layer 15 and the standard pitched openings 12 are punched into the center piece. These openings may optionally be formed before covering the strip with a metal layer 15 which is a good conductor, as explained below.

In the remainder of this description it is assumed that the entire surface of the strip 9 is covered during the metal plating operation and that the openings 2 are formed after the metal plating. The metal of the strip is, for example, an alloy of beryllium and bronze, which is a relatively poor electrical conductor, and the metal plating process is, for example, electrolytic plating in a silver bath. If the entire strip is electroplated, the edges of the strip will be covered with a layer joining its two surfaces, like layer 15s shown in Figure 1a.

As shown in Figure 2, the openings 2 are formed in the metallized strip seen in Figure 1a with an initial gauge pitch _d1 in the direction of the longitudinal axis of symmetry A of the strip to form a discontinuous central piece of the blade 3 CS, the longitudinal ends 31 and 32 of this blade 3 are connected to the two continuous edge pieces ES ₁ and ES ₂ of the belt. Preferably, these openings can be relatively narrow at their waists, which in this example are along the longitudinal axis of symmetry A of the belt, especially to obtain as small an initial pitch as possible for a given blade width D. distance d ₁ , and also to limit the amount of remaining material.

The width D of each blade is preferably greater than about 80% of the initial pitch _d1 , since its width at the waist is equal to _d1 -D, so an opening has a width at its waist at most equal to about 20% of _d1 . For a particular blade width D, it is not desirable that the initial pitch _d1 of the openings be much larger than D, as this would force the use of longer strips of metal plating and increase the width of the openings, implying increased manufacturing costs. In addition, as described below, the pleating operation is used to form pleats protruding from the same side of the belt, the height of the pleats increases with the initial pitch _d1 , although it is not desirable to form too large pleats as this would hinder the contact tabs Adaptation to the connector for which it is intended.

The two edge pieces ES ₁ and ES ₂ of the strip are externally grooved to form a tongue 4 for connecting the contact piece with a part of the connector for which it is intended. In the present embodiment, the blade 3 is symmetrical with respect to its longitudinal axis A _T , which is perpendicular to the longitudinal axis _A , but a design which is not completely symmetrical such that a slightly asymmetric opening shape can be used .

Conventionally, the blades are next twisted about their longitudinal axis so that they pivot relative to the plane of the belt so that the two surfaces of each blade form a respective contacts 3A and 3B, as can be seen in the first part of Figure 3. This twisting operation is conventionally performed simultaneously with bending of the two edges of each blade in at least one longitudinal plane perpendicular to the plane of the strip, so as to form at least one contact area on each surface of the blade, in which Electricity flows between the blade and part of the connector. In the rest of the description it will be understood that the contact 3A or 3B comprises at least one contact surface.

In the manufacturing method according to the present invention, it is generally preferred from a cost point of view that the operations of cutting out the blades and tongues, twisting and bending the blades, and The continuous edge piece of the belt is pleated. This is because it costs very little to do so, especially labor costs, without having to reset or adjust the belt between operations. This is why it is generally preferred to carry out a metal plating operation at the very beginning of the production method according to the invention.

Furthermore, it must be noted that when punching a solid metal plated strip, as shown in Figure 1a, the electrical conductivity between the two layers covering the two surfaces of the blades of the strip is only affected by the metal thickness of the strip . This is because the blade cut out by punching does not have on its edge a metal layer connecting its two surface layers, such as layer 15s which can be seen on the edge of the strip in Fig. la. The metal of the contact strap is generally not a good conductor of electricity. However, since such strips are usually relatively thin, typically from 0.10mm to 0.40mm thick, large currents can be conducted, and the strips have sufficient surface area for the overall resistance of the contact piece to take into account that the pass will flow through The overall resistance of the contact piece, that is, the equivalent resistance between the two sets of contacts 3A and 3B of all blades, remains within an acceptable value range in the case of heating the blades due to the current flow.

If the overall resistance of the contact blade must be reduced without increasing the surface of the strip or reducing its thickness, it may be necessary to metallize the already punched strip, i.e. after the blade has been cut out and possibly twisted and after bending. This is because metal, which is a good conductor, then covers the surface and edges of each blade. Therefore, in the contact piece obtained by this method, the current flowing between the two contacts 3A and 3B of the blade is divided between the thickness of the strip 9 and the edge of the blade, so that the entire resistance of the obtained contact piece can be was reduced to a certain extent. However, for the reasons mentioned earlier, metal plating at this stage usually entails a considerable increase in costs compared to a sequence of operations where metal plating is carried out right at the beginning of the process.

The first part of Figure 3 is a view of the secondary and primary contact pieces in longitudinal section, in a plane perpendicular to the plane P of the strip and passing through its longitudinal axis A. The initial contact piece can be seen on the right-hand side of FIG. 3 , which is obtained after the twisting operation of the blades of the contact piece shown in FIG. 2 . The vanes 3 are spaced apart by the same initial pitch d ₁ as the openings 2 . In this representation, the tongue 4 has been inclined relative to the plane P of the belt, as can be seen in FIG. 5 . The left-hand side of the figure shows the secondary sheet obtained after pleating the two consecutive edge sheets ES ₁ and ES ₂ of the belt such that the blades 3 are spaced apart by the new pitch d ₂ and before their heat treatment. It must be borne in mind that in the manufacturing method according to the invention, the above-mentioned pleating operation must be carried out after the metal plating strip, in order to avoid little plating in the parts where the blades overlap each other.

To give an idea of the magnitudes involved, for example, an initial pitch d ₁ of 2.5 mm and a corresponding new pitch d ₂ of 1.7 mm yields a blade with a proximity factor d ₁ /d ₂ close to 1.5. It can be noted that the blades partly overlap each other in a direction perpendicular to the plane P of the belt. However, the distance between the edge of one blade and the surface of the blade closest to it must be kept large enough so that when the final contact piece is fitted and pressed between the two parts of the connector, as shown in Figure 5 When between the two parts 11 and 12 shown, this edge does not come into contact with the surface. Therefore, starting with a given initial contact piece, there is a lower limit to the new pitch _d2 , and this limit must never be exceeded. The limit depends inter alia on the inclination of the blade with respect to the plane of the belt, the required elasticity of the blade and the width D and thickness of the blade. Therefore, in order to obtain a high blade density while obtaining good conductivity for high currents, a compromise has to be made to obtain a pitch d ₂ as small as possible.

The initial pitch _d must be large enough to be able to cut _fairly wide blades so that they can be bent and form an area with a satisfactory contact surface area for the connection that this initial pitch d is to be used for The two parts of the device are compatible. Furthermore, since each blade of the resulting contact strip can be resiliently pivoted, it is important to have a blade whose width D is sufficiently large to achieve the desired elastic movement within the contact area of each blade. However, wide blades will to some extent necessitate an increase in the new pitch d ₂ , which prevents achieving a high density of blades. As explained in the description with respect to Fig. 2, since it is undesirable that the initial pitch _d1 is greater than 1.25 times the required width D of the blade, a compromise must be made to minimize the initial pitch.

There is an optimal range of values for the approach factor d ₁ /d ₂ corresponding to the new pitch _{d 2 which} is small enough to obtain a relatively large blade density from the initial contact blade with an initial The pitch _d1 is large enough to form a blade with satisfactory electrical and mechanical properties. A blade proximity factor from 1.3 to 2 constitutes an optimal compromise and fully meets the technical requirements indicated above.

The second section in Figure 3, located below the first section, is a plan view of the primary and secondary contact pads shown in the first section of the figure. The mutual overlapping of the vanes of the secondary sheet can be clearly seen on the left hand side of the figure. After the pleating operation, the tongues 4 are evenly spaced at the same new pitch _d2 as the blades.

As can be seen in the first part of Figure 3, the pleats 5 formed transversely in the belt to move the blades 3 closer together all protrude on the same side of the plane P of the belt, preferably the same side as the tongue The side to which object 4 is bent is the same. In this way, the two continuous edge pieces ES ₁ and ES ₂ of the strip present a crenellated shape with pairs of crenellations, each separated by the base of the pleats 5 .

The inner walls of the pleats 5 are not in contact with each other, so that there is no risk during the pleat-breaking process when bending is applied to the continuous edge pieces of the strip, which overlay a central piece CS of the strip on the edge pieces ES ₁ and ES ₂ The case of the conductive layer 15 is most advantageous. Because if the pleats are formed by pressing one wall against the other, the risk of possible rupture mainly exists in layer 15 .

Each pleat thus has an inner space forming a cavity 6 opening in the plane P of the strip. Each cavity has two substantially flat walls parallel to each other and perpendicular to the plane of the belt in the embodiment of FIG. . The bottom of the cavity thus has a curvature diameter δ which corresponds to the diameter of the semi-cylindrical surface and which in this embodiment is also equal to the distance between the two planar walls of the cavity.

Alternatively, the pleats 5 may be formed with two planar walls, which are not parallel to each other, such as the shape shown in Figure 3a. In this figure, one of the two planar walls of the pleats 5 is perpendicular to the plane of the strip, but this is not essential and an angle other than 90° could be used. The wall forming the bottom of the cavity 6 partially adopts the shape of a cylinder with a diameter δ, thus having a diameter of curvature equal to δ.

Advantageously, each transverse pleat 5 has a height h such that the ratio d ₂ /h between the new standard pitch d ₂ and its height is from 1.7 to 2.5. The height of the pleat is the distance between the plane of the edge piece at the end of the pleat and the plane parallel to the face tangent to the highest point of the pleat, assuming that each pleat protrudes from the same side of the tape plane. For example, for a new pitch of 1.75mm, the pleat height may be 0.85mm, which gives a ratio _d2 /h of approximately 2. The range indicated above constitutes a good compromise, such that the tongue 4 is wide enough, but the pleats 5 are high enough to move the blades 3 closer together, with the required new pitch _d2 . The width of the tongue is measured at the level of the longitudinal curvature formed with the continuous edge pieces ES ₁ , ES ₂ of the belt.

Firstly, the tongues 4 must have a certain rigidity while having a certain elasticity, so that they can engage in grooves in the first part 11 of the connector when the contact piece is assembled, as shown in FIG. 5 . The tip of the tongue must then rest sufficiently against the inclined wall of the groove 13 to hold the contact piece when engaging against the portion 11 . If the tongue is too narrow, the contact blade will not be held by resting firmly enough against part 11 and there will be a risk of the blade coming out of engagement when the two parts 11 and 12 of the connector are not connected.

In order for each transverse pleat 5 to satisfy the previously indicated range of ratio d ₂ /h, the ratio h/δ between the height h of the pleat and the diameter δ of curvature at the bottom of the cavity 6 of the pleat is preferably and advantageously from 2.4 to 3.2. A ratio h/δ in the above range allows in particular a sufficiently wide bend without the risk of breaking the edge pieces during pleating, if the edge pieces ES ₁ and ES ₂ of the belt are covered with a conductive layer 15 . For example, for a pleat height of 0.85 mm, the diameter of curvature δ may be 0.3 mm, resulting in a ratio h/δ of approximately 2.8.

FIG. 4 is a schematic diagram showing a slightly different blade shape than a conventional blade shape similar to the shape of the contact piece shown in FIG. 2 . The blade 3 has an intermediate portion 7 which is narrower along the longitudinal axis of symmetry A of the strip, as in some prior art embodiments, for example in patent document CH590570. This blade shape is adapted to the middle part of the blade so that it cannot come into contact with the connector part after the blade is twisted about its axis A _T and the edges of the blade sides are bent to form the contacts, as can be seen for example in Fig. 5 Part 11 or 12. In this way, each of the two surfaces of the blade has two contact surfaces Z ₁ and Z ₂ on respective opposite sides of said intermediate portion and are symmetrical with respect to the axis A.

In Fig. 5, contact blades formed of blade strips similar to those shown in Fig. 4 have been mounted in the first part 11 of the connector. A cross-section of the contact piece through the blade is schematically shown in a plane perpendicular to the strip plane. The first part 11 comprises two longitudinal grooves 13 for immobilizing the tongue 4 of the contact piece when the contact piece has been mounted. Moreover, in order that the folds 5 of the two continuous edge pieces ES ₁ and ES ₂ of the strip do not touch against the bottom of the groove when the contact piece is pressed between the two connector parts 11 and 12, each groove Groove 13 is sufficiently deep. The first part 11 of the connector has between its two longitudinal grooves 13 a planar or cylindrical longitudinal surface 20 into which the contacts 3B of the bottom surface of the blade are pressed and pushed against when the tongue 4 is fitted into the groove. It is held against the surface or the longitudinal surface 20 of the cylinder. The two ends 21 and 22 delimiting the longitudinal surface 20 transversely with respect to the two longitudinal grooves 13 may constitute edge displacement abutments to the contact strips. If there is friction in the direction transverse to the contact blade, the contact blade tends to move laterally, especially when the two connector parts 11 and 12 are connected or disconnected. If the tongue 4 is not rigid enough to limit this movement, the pleats 5 of the continuous edge sheet ES ₁ or ES ₂ can abut against the end 21 or 22 and prevent any further movement.

The two parts 11 and 12 - interconnected, the contacts 3A on the top surface of the blade are adapted to bear against the second part 12 of the connector. The second part 12 is shown in dotted outline at the location where the second part is connected. It is clear that each contact 3A or 3B comprises two contact areas, eg areas Z ₁ and Z ₂ for contact 3A. Thus, the surface area of the contacts between a blade face and a connector portion is substantially increased relative to more conventional embodiments in which each surface of the blade has only one contact area. In this way, the contact resistance between the contact 3A or 3B and the corresponding connector part 12 or 11 can be significantly reduced.

FIG. 6 schematically shows a cross-sectional portion of a contact piece similar to that shown in FIG. 5 . The connector portion holding the sheet includes means for immobilizing the sheet longitudinally, which may be advantageous in some relatively marginal embodiments. The aforementioned means comprise a crenellation 14 corresponding to the shallower region of the longitudinal groove 13 , the bottom of which is formed in this case by the bottom of the groove 13 . Once the sheet is assembled, the crests of the crests are closer to the plane P of the strip than the crests of the pleats 5 . Thus, if a greater force is applied to the contact strips in the longitudinal direction so that the tongues of the contact strips slide in their retaining grooves 13, the folds 5 abut against the crenelation 14 and prevent further movement of the strip. vertical movement. For such an embodiment, it is not necessary to have as many crenelations 14 in the grooves 13 as there are folds 5 in the associated contact piece, ie a small number of crenellations are distributed over the entire length of the piece.

Figure 6a is a diagrammatic view of the device of Figure 6 in a longitudinal section on plane P'. Like the device in Figure 5, the bottom of the groove 13 is far enough away from the pleats 5 that they do not contact the contact pieces when pressed in. It is clear that the pleats 5 can rest on the sides of the crenellation 14 if the sheet is moved longitudinally.

Thus, with the embodiment shown in Figures 6 and 6a, since the first connector part 11 supports the contact blade, the blade can be nested within this connector part and secured in the longitudinal direction. Thus if the connector is cylindrical it naturally implies the ability to hold the piece immobilized against rotation.

Claims (10)

1. a method of making the contact chip of electric equipment connector is to obtain by the secondary contact chip of being made by metal tape (9) is carried out piecemeal, forms to have initial pitch (d in above-mentioned metal tape ₁) opening (2), to form the discontinuous centre slice (CS) of blade (3), vertical end of blade (31,32) is connected to two continuous boundary sheet (ES of described metal tape ₁, ES ₂) on, with each described blade around its longitudinal axis (A _T) twist to rotate and crooked around pivot with respect to the plane (P) of described metal tape, make in two face each all have at least one raised zones (Z ₁, Z ₂) on a side on described plane, to form contact (3A, 3B), described distortion and bending operation produce initial contact chip (10), its blade (3) is spaced apart with the standard pitch identical with the initial pitch (d1) of described opening (2), and this method further comprises by at each continuous boundary sheet (ES ₁, ES ₂) go up to form pleat (5) and come to carry out pleating to described initial contact chip (10), more closely come to together to move described blade (3), this method also comprises the quenching heat treated so that described blade has the certain flexible hardness that has simultaneously, make them play the effect of spring, the method is characterized in that it is from following three steps:

A) enterprising row metal is electroplated so that metal level (15) covers described centre slice (CS) at least in two sides of described metal tape (9), and the metal of this metal level (15) is than the better electric conductor of the metal of described metal tape,

B) in described metal tape (9), form described opening (2) and

C) each described blade (3) is twisted and crooked,

And its feature also is to comprise then following continued operation:

D) with two continuous boundary sheet (ES of described initial contact chip (10) ₁, ES ₂) pleating,

E) after aforementioned operation, the contact chip that obtains is carried out described quenching heat treated, forming described secondary contact chip (1), and

F) described secondary contact chip is divided into a plurality of contact chips that will be installed on the connector, will has for the needed leaf length of each connector for these contact chips of these connectors.

2. according to the manufacture method of claim 1, it is characterized in that, give described metal tape (9) plating by electroplating.

3. according to the manufacture method of claim 1, it is characterized in that, in the metal plating operating process, cover all surface of described metal tape (9).

4. according to the manufacture method of claim 1, it is characterized in that punching forms the described metal tape of described opening (2) metal plating before in described band.

5. according to the manufacture method of claim 1, it is characterized in that, in described pleating operating process, move described blade (3) and more closely come to together, with new standard pitch (d ₂) be evenly spaced apart, make initial pitch (d ₁) and new pitch (d ₂) between ratio be from 1.3 to 2.

6. according to the manufacture method of claim 5, it is characterized in that, in the metal plating operating process, cover all surface of described metal tape (9), and on the same side on the plane of described metal tape (P) at two continuous boundary sheet (ES of described metal tape ₁, ES ₂) in form described pleat (5), and each pleat all has a height (h) and makes new standard pitch (d ₂) and described height (h) between ratio be from 1.7 to 2.5.

7. according to the manufacture method of claim 6, it is characterized in that, each pleat (5) all is formed with transverse passageway (6), this cavity has straight line portion and the part with constant curvature radius at that joint of longitudinal direction (A), and the bottom of described cavity has a curvature diameter (δ) makes that the height (h) of pleat and the ratio between this diameter (δ) are from 2.4 to 3.2.

8. contact chip that is used to connect the medium-pressure or high pressure electric equipment, obtain from metal tape (9), opening is arranged to form the discontinuous centre slice (CS) of blade (3) in metal tape, the whole surface of described contact chip all is coated with the metal level (15) of the good conductor that belongs to electricity, and vertical end of described blade (31,32) is connected to two continuous boundary sheet (ES of described metal tape ₁, ES ₂) on, described metal tape has been bent transverse curvature (5), described blade standard pitch (d ₂) be evenly spaced apart, contact chip is characterised in that, and described pleat is outstanding from the same side on the plane (P) of described metal tape, and each pleat all has a height (h), makes described standard pitch (d ₂) and described height (h) between ratio be from 1.7 to 2.5.

9. contact chip according to Claim 8, it is characterized in that, each pleat (5) all is formed with transverse passageway (6), this cavity has straight line portion and the part with constant curvature radius at that joint of longitudinal direction (A), and the bottom of described cavity has a curvature diameter (δ) makes that the height (h) of pleat and the ratio between this diameter (δ) are from 2.4 to 3.2.

10. according to Claim 8 or 9 contact chip, it is by obtaining according to the manufacture method of any one in the claim 1 to 5.

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