Water-cooling casting mold for manufacturing copper-chromium contact

Abstract

The utility model belongs to the technical field of copper-chromium contact manufacturing, and particularly relates to a water-cooling casting mold for manufacturing a copper-chromium contact, which comprises a lower mold and an upper mold. A casting groove is concavely formed in the inner side of the top face of the lower die, and a plurality of lower cooling water channels are formed in the bottom of the lower die. A plurality of vertically-through casting notches are formed in the top face of the upper die, a plurality of bosses are evenly arranged on the bottom face of the upper die and extend into the casting grooves respectively, and a plurality of upper cooling water channels are formed in the upper die. Due to the fact that copper-chromium alloy liquid is cast into a cylindrical mold barrel, during cooling, the cooling speed close to the outer side of a metal rod is high, the cooling speed of the center of the metal rod is low, serious segregation occurs in the solidification process of the metal rod, separated alpha chromium is enriched and grows up, and the copper-chromium alloy liquid is cooled. According to the utility model, the lower die with the lower cooling water channel and the upper die with the upper cooling water channel are arranged in a matched manner, so that a whole casting positioned in the casting groove between the lower die and the upper die can be uniformly cooled, and the problems of inconsistent cooling speed and too slow cooling speed of each part of a manufactured metal wafer raw material are effectively solved; therefore, the defects of excessive fluctuation, looseness, shrinkage and the like of metal wafer raw material components are eliminated.

Description

Technical Field

[0001] This utility model belongs to the field of copper-chromium contact manufacturing technology, specifically a water-cooled casting mold for making copper-chromium contacts. Background Technology

[0002] Currently, the manufacturing process for copper-chromium contacts typically involves pouring molten copper-chromium alloy into a cylindrical mold to form an alloy metal rod. This rod is then cut into 6mm thick metal discs for further processing. Because the molten copper-chromium alloy is poured into a cylindrical mold, the cooling rate is faster near the outer edge of the metal rod compared to the center. This results in severe segregation during solidification, causing the precipitated α-chromium to accumulate and grow, and leading to defects such as shrinkage cavities and porosity, ultimately affecting the material's performance. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a water-cooled casting mold for manufacturing copper-chromium contacts.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A water-cooled casting mold for manufacturing copper-chromium contacts includes a lower mold and an upper mold. The lower mold has a casting groove recessed on the inner side of its top surface and several lower cooling water channels at its bottom. The upper mold is disposed on the top surface of the lower mold and has several vertically penetrating casting slots on its top surface corresponding to the casting grooves. Several bosses are evenly distributed on the bottom surface of the upper mold at locations corresponding to the casting slots, and each boss extends into the casting groove. Several upper cooling water channels are provided on the upper mold. Each lower and upper cooling water channel has an inlet and an outlet for connecting to an external circulating water cooling system. After the upper mold is disposed on the top surface of the lower mold, there is a gap between the lower end face of each boss and the bottom surface of the casting groove.

[0006] All of the lower cooling channels are located on the lower side of the casting groove, and all of the lower cooling channels and all of the upper cooling channels are arranged parallel to each other.

[0007] The outer contour of the casting groove is rectangular, and the bottom surface of the casting groove is planar.

[0008] After the upper mold is placed on the top surface of the lower mold, the gap between the lower end face of each boss and the bottom surface of the casting groove is 6-10mm.

[0009] All the bosses on the bottom surface of the upper mold are divided into several parallel columns of boss groups, and each column of boss group includes the same number of bosses.

[0010] Each of the upper cooling channels corresponds to a row of bosses, and each upper cooling channel passes through all the bosses of its corresponding row of bosses.

[0011] The number of columns of the boss group is an even number of not less than two, forming several boss group pairs. Each boss group pair includes two columns of adjacent boss groups. The number of casting slots corresponds to the number of boss group pairs. Each casting slot is located between the two columns of boss groups in its corresponding boss group pair. The length direction of each casting slot is parallel to the length direction of each boss group.

[0012] The size of the upper opening of each casting slot is larger than the size of the lower opening of the casting slot.

[0013] The present invention provides a water-cooled casting mold for manufacturing copper-chromium contacts, which further includes a casting hopper. The casting hopper is disposed on the top surface of the upper mold and is located on the outer side of all the casting slots.

[0014] Inside the casting hopper, a guide block is provided between each pair of adjacent casting slots. The bottom surface of each guide block is in contact with the upper mold. The highest point on the top surface of each guide block is located away from the middle of the two adjacent casting slots. The top surface of each guide block gradually slopes downward from the middle of the two casting slots to the edge of each adjacent casting slot.

[0015] The advantages and positive effects of this utility model are as follows:

[0016] This invention, through the cooperative arrangement of a lower mold with a lower cooling channel and an upper mold with an upper cooling channel, can uniformly cool the entire casting located in the casting groove between the lower and upper molds. The resulting metal disc portion of the casting can be cooled quickly and evenly, effectively solving the problems of inconsistent cooling rates and excessively slow cooling rates in the produced metal disc raw materials. This eliminates defects such as excessive fluctuations in the composition of the metal disc raw materials and porosity and shrinkage cavities, ensuring that every copper-chromium contact piece produced in subsequent processing meets the quality requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the lower mold and upper mold of this utility model when they are separated.

[0018] Figure 2 This is a bottom view of the upper mold structure of this utility model;

[0019] Figure 3 This is one of the cross-sectional structural schematic diagrams of this utility model;

[0020] Figure 4 This is the second cross-sectional structural schematic diagram of this utility model.

[0021] In the diagram: 1 is the lower mold, 101 is the casting groove, and 102 is the lower cooling water channel;

[0022] 2 is the upper mold, 201 is the casting slot, 202 is the boss, and 203 is the upper cooling water channel;

[0023] 3 is the casting hopper, and 4 is the guide block;

[0024] 5 represents a casting. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail.

[0026] A water-cooled casting mold for manufacturing copper-chromium contacts, such as Figure 1-4 As shown, this embodiment includes a lower mold 1 and an upper mold 2. The lower mold 1 has a casting groove 101 recessed on its inner top surface, and four lower cooling water channels 102 are formed at its bottom. In use, the upper mold 2 is placed on the top surface of the lower mold 1. Two vertically penetrating casting slots 201 are formed on the top surface of the upper mold 2, corresponding to the casting grooves 101. Twenty protrusions 202 are evenly distributed on the bottom surface of the upper mold 2, corresponding to the casting slots 201. Each protrusion 202 extends into the casting groove 101. Four upper cooling water channels 203 are formed on the upper mold 2. Each lower cooling water channel 102 and each upper cooling water channel 203 has an input port and an output port for connecting to an external circulating water cooling system. The connection method between each lower cooling water channel 102 and each upper cooling water channel 203 and the external circulating water cooling system adopts existing technology. The external circulating water cooling system itself also adopts existing technology, such as being composed of a circulating pump, a refrigeration unit, and a cooling water tank. After the upper mold 2 is set on the top surface of the lower mold 1, there is a gap between the lower end face of each boss 202 and the bottom surface of the casting groove 101.

[0027] In this embodiment, the outer contour of the casting groove 101 is rectangular, and the bottom surface of the casting groove 101 is flat. After the upper mold 2 is set on the top surface of the lower mold 1, the gap between the lower end face of each boss 202 and the bottom surface of the casting groove 101 is 6-10mm. The cross-sectional shape of each boss 202 is circular, so as to be suitable for casting a metal disc with a thickness of 6-10mm as generally required. The cross-sectional shape and thickness of each boss 202 can also be arbitrarily adjusted according to other usage requirements. The boss 202 can be fixed to the bottom surface of the upper mold 2 by welding.

[0028] Specifically, in this embodiment, all lower cooling channels 102 are located on the lower side of the casting groove 101, and all lower cooling channels 102 and all upper cooling channels 203 are arranged parallel to each other and uniformly, so as to uniformly cool the casting 5 located in the casting groove 101 between the lower mold 1 and the upper mold 2.

[0029] Specifically, in this embodiment, all the bosses 202 on the bottom surface of the upper mold 2 are divided into four parallel rows of boss groups, each row of boss groups including five bosses 202. Each upper cooling water channel 203 corresponds to one row of boss groups, and each upper cooling water channel 203 passes through all the bosses 202 of its corresponding row of boss groups, which can more effectively cool the bosses 202, and further ensure that the part of the casting 5 that will later form a metal disc, which is directly in contact with the bosses 202, can be cooled evenly and fully. Figure 2 As shown, in this embodiment, four columns of bosses form two boss pairs. Each boss pair includes two adjacent columns of bosses. The number of casting slots 201 corresponds to the number of boss pairs. Each casting slot 201 is located between the two columns of bosses in its corresponding boss pair. The length direction of each casting slot 201 is parallel to the length direction of each boss pair. The upper opening size of each casting slot 201 is larger than the lower opening size, which allows the cast alloy solution to fill the casting groove 101 better and faster.

[0030] Specifically, such as Figure 3 and Figure 4 As shown, the water-cooled casting mold for manufacturing copper-chromium contacts in this embodiment also includes a casting hopper 3 for assisting in the injection of the alloy solution into the mold. The casting hopper 3 is disposed on the top surface of the upper mold 2, and is located on the outer side of all casting slots 201. In this embodiment, the casting hopper 3 is fixed to the top surface of the upper mold 2 using existing technology, such as welding or screws. A guide block 4 is provided on the inner side of the casting hopper 3, between two adjacent casting slots 201. The bottom surface of the guide block 4 is in contact with the upper mold 2. The highest point on the top surface of the guide block 4 is located away from the center of the two adjacent casting slots 201. The top surface of the guide block 4 gradually slopes downward from the center away from the two casting slots 201 to the edge of each adjacent casting slot 201. In this embodiment, only one guide block 4 is provided, and the guide block 4 can be an integral structure with the casting hopper 3 for easy assembly and disassembly. By setting the guide block 4, the alloy solution entering the casting hopper 3, especially the alloy solution falling on the guide block 4, can flow fully along the inclined surface of the guide block 4 to the casting groove 201, thus avoiding the accumulation of alloy solution in the casting hopper 3 and resulting in waste.

[0031] Working principle:

[0032] Before casting, the upper mold 2 is first placed on top of the lower mold 1 and joined together. The inlets and outlets of each lower cooling channel 102 and each upper cooling channel 203 are connected to an external circulating water cooling system. Then, circulating cooling water is introduced into each lower cooling channel 102 and each upper cooling channel 203 to increase the cooling rate of the alloy solution inside the mold. During casting, the alloy solution is poured into the mold through the casting hopper 3. The alloy solution simultaneously flows through each casting slot 201 into the casting groove 101, allowing the alloy solution to quickly cool down. After casting is completed, the alloy solution in the casting groove 101 is rapidly and uniformly cooled by the circulating cooling water in each lower cooling channel 102 and each upper cooling channel 203 to form the casting 5. Each part of the casting 5 corresponding to the boss 202 is relatively thin, thus forming the required metal disc portion. The casting 5 can then be processed by existing common processing methods (such as stamping, laser cutting, etc.) to remove the excess part of the casting 5 and obtain the required metal disc raw material for subsequent processing to obtain copper-chromium contacts. Through the cooperative arrangement of the lower mold 1 with the lower cooling channel 102 and the upper mold 2 with the upper cooling channel 203, the entire casting 5 located in the casting groove 101 between the lower mold 1 and the upper mold 2 can be uniformly cooled. The metal disc portion of the casting 5 formed can be cooled rapidly and uniformly, effectively solving the problems of inconsistent cooling speed and slow cooling speed of the metal disc raw material, thereby eliminating defects such as excessive fluctuation in the composition of the metal disc raw material and porosity and shrinkage cavities.

Claims

1. A water-cooled casting mold for manufacturing copper-chromium contacts, characterized in that: The system includes a lower mold (1) and an upper mold (2). The lower mold (1) has a casting groove (101) recessed on the inner side of its top surface. The lower mold (1) has several lower cooling water channels (102) at its bottom. The upper mold (2) is located on the top surface of the lower mold (1). The upper mold (2) has several vertically penetrating casting slots (201) on its top surface corresponding to the casting groove (101). The upper mold (2) has several protrusions evenly distributed on its bottom surface corresponding to the casting slots (201). (202) Each of the bosses (202) extends into the casting groove (101). The upper mold (2) is provided with a plurality of upper cooling water channels (203). Each of the lower cooling water channels (102) and each of the upper cooling water channels (203) has an input port and an output port for connecting to an external circulating water cooling system. After the upper mold (2) is set on the top surface of the lower mold (1), there is a gap between the lower end face of each boss (202) and the bottom surface of the casting groove (101).

2. The water-cooled casting mold for manufacturing copper-chromium contacts according to claim 1, characterized in that: All of the lower cooling channels (102) are located on the lower side of the casting groove (101), and all of the lower cooling channels (102) and all of the upper cooling channels (203) are arranged parallel to each other.

3. The water-cooled casting mold for manufacturing copper-chromium contacts according to claim 1, characterized in that: The outer contour of the casting groove (101) is rectangular, and the bottom surface of the casting groove (101) is planar.

4. The water-cooled casting mold for manufacturing copper-chromium contacts according to claim 1, characterized in that: After the upper mold (2) is placed on the top surface of the lower mold (1), the gap between the lower end face of each boss (202) and the bottom surface of the casting groove (101) is 6-10mm.

5. A water-cooled casting mold for manufacturing copper-chromium contacts according to claim 1, characterized in that: All the bosses (202) on the bottom surface of the upper mold (2) are divided into several parallel columns of boss groups, and each column of boss group includes the same number of bosses (202).

6. A water-cooled casting mold for manufacturing copper-chromium contacts according to claim 5, characterized in that: Each of the upper cooling channels (203) corresponds to a row of bosses, and each of the upper cooling channels (203) passes through all the bosses (202) of the corresponding row of bosses.

7. A water-cooled casting mold for manufacturing copper-chromium contacts according to claim 5, characterized in that: The number of columns of the boss group is an even number of not less than two, forming several boss group pairs. Each boss group pair includes two columns of adjacent boss groups. The number of casting slots (201) corresponds to the number of boss group pairs. Each casting slot (201) is located between the two columns of boss groups in its corresponding boss group pair. The length direction of each casting slot (201) is parallel to the length direction of each boss group.

8. A water-cooled casting mold for manufacturing copper-chromium contacts according to claim 1, characterized in that: The size of the upper opening of each of the casting slots (201) is larger than the size of the lower opening of the casting slot (201).

9. A water-cooled casting mold for manufacturing copper-chromium contacts according to claim 1, characterized in that: It also includes a casting hopper (3), which is disposed on the top surface of the upper mold (2) and is located on the outer side of all the casting slots (201).

10. A water-cooled casting mold for manufacturing copper-chromium contacts according to claim 9, characterized in that: Inside the casting hopper (3) and between each pair of adjacent casting slots (201), there are guide blocks (4). The bottom surface of each guide block (4) is in contact with the upper mold (2). The highest point on the top surface of each guide block (4) is away from the middle of the two adjacent casting slots (201). The top surface of each guide block (4) gradually slopes downward from the middle of the two casting slots (201) to the edge of each adjacent casting slot (201).

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