Structure and methods to prevent solder from flowing into the flow channel functional area

Abstract

The application provides a structure and method for avoiding filler flowing into a functional area of a flow channel. The brazing method comprises at least two plates which are adapted to be joined together. The plates are processed according to the following steps: S1, processing a functional area of a joint surface of each plate; S2, processing a flow resistance part on the joint surface of at least one plate, the flow resistance part at least surrounds part of the functional area; S3, arranging filler on at least part of a brazing surface of at least one of the two plates to be joined, so that the filler is separated from the functional area by the flow resistance part; S4, sequentially stacking the plates; and S5, combining the plates into one by a brazing process. The structure for avoiding filler flowing into a functional area of a flow channel comprises a main flow channel plate and a branch flow channel plate, and the main flow channel plate and the branch flow channel plate are connected by the above-mentioned brazing method. The filler is separated from the functional area by the flow resistance part, so that the filler can be effectively prevented from flowing into the functional area when the plates are brazed, and the performance of the functional area is ensured.

Description

Technical Field

[0001] This invention belongs to the field of brazing technology, specifically relating to a structure and method for preventing brazing filler metal from flowing into the flow channel functional area. Background Technology

[0002] Hot runner systems are heating components used in injection molds to inject molten plastic particles into the mold cavity. Hot runner molds are a new construction that heats the runners and sprues of traditional or three-plate molds, eliminating the need to remove the runners and sprues for each molding cycle.

[0003] When a hot runner plate is brazed, the molten brazing filler metal easily flows to the wall of the fluid channel. After cooling, it forms an uneven and rough surface on the wall of the fluid channel, which reduces the smoothness of the fluid channel wall and has an adverse effect on the performance of the hot runner.

[0004] The common way to control the flow of solder is to use a flow retardant. However, when there is a large amount of solder, or when the solder is squeezed beyond the boundary of the flow retardant during assembly, the flow retardant is unable to prevent the solder from flowing to the wall of the fluid channel, which has certain limitations. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a structure and method for preventing solder from flowing into the functional area of ​​the flow channel.

[0006] The technical solution adopted by this invention to solve its technical problem is: A brazing method comprising at least two mating plates; processed according to the following steps: S1 is the functional area for processing the joint surfaces of various plates; S2, a flow-blocking portion is processed on the mating surface of at least one plate, the flow-blocking portion at least surrounding a portion of the functional area; S3, solder is provided on at least a portion of the brazing surface of at least one of the two bonded plates, such that the solder is separated from the functional area by a flow-blocking part; S4, stack the boards in sequence; S5 uses a brazing process to combine the various plates into one piece.

[0007] In this invention, the flow-blocking part includes a groove structure and surrounds the functional area.

[0008] In this invention, the groove structure is a flow-blocking groove provided on two mutually adapted and joined plates; a flow-blocking component is provided in the flow-blocking groove.

[0009] In this invention, the flow-blocking part consists of flow-blocking grooves and flow-blocking protrusions respectively provided on two mutually fitted and joined plates.

[0010] In this invention, during step S2, a brazing surface is processed on the joint surface of the plate, so that the brazing surface is lower than the functional area surface of the functional area and forms a step with a height difference, which constitutes a flow-blocking part.

[0011] A structure that prevents brazing filler metal from flowing into the flow channel functional area includes a main flow channel plate and a branch flow channel plate; characterized in that: the main flow channel plate and the branch flow channel plate are connected by the above-mentioned brazing method.

[0012] In this invention, a fluid channel groove is provided in the functional area, and the fluid channel grooves of two mating plates correspond to form a fluid channel.

[0013] In this invention, a positioning pin hole is opened on the brazing surface. When two mating plates are joined, the positioning pin is inserted into the positioning pin hole to position the two plates.

[0014] In this invention, a clamp is also provided for fixing each plate, and the plate is provided with a boss surrounding the through hole.

[0015] The beneficial effects of this invention are: By setting up flow-blocking sections to separate the brazing filler metal from the functional areas, the brazing filler metal can be effectively prevented from flowing into the functional areas during plate brazing, thus ensuring the performance of the functional areas. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the brazing process in this embodiment; Figure 2 This is a schematic diagram of the structure in this embodiment where both of the two joined plates are provided with flow-blocking grooves; Figure 3 for Figure 2 Enlarged view of section A; Figure 4 This embodiment shows a schematic diagram of two interlocking plates with mutually compatible flow-blocking grooves and flow-blocking protrusions. Figure 5 for Figure 4 An enlarged view of part B in the image; Figure 6 This is a schematic diagram of a structure in which two interlocking plates are provided with steps. Figure 7 for Figure 6 Enlarged view of section C; Figure 8 This is a schematic diagram of the structure in this embodiment where both of the two joined plates are provided with steps and flow-blocking grooves; Figure 9 for Figure 8 Enlarged view of section D; Figure 10This is a schematic diagram of the main paving slab structure in this embodiment; Figure 11 This is a schematic diagram of the structure for installing the flow divider plate and the fixture in this embodiment; Figure 12 This is a schematic diagram of the flow channel plate in this embodiment. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0018] Example: like Figure 1 As shown, this embodiment discloses a brazing method, including at least two mutually compatible and interlocking plates 1; processed according to the following steps: S1, Functional area 2 for processing the joint surfaces of each board 1; S2, a flow-blocking portion 3 is processed on the joint surface of at least one plate 1, the flow-blocking portion 3 at least surrounding a portion of the functional area 2; S3, at least a portion of the brazing surface 9 of at least one of the two bonded plates 1 is provided with brazing filler metal 4, such that brazing filler metal 4 is separated from functional area 2 by flow-blocking portion 3; S4, stack the board 1 in sequence; S5, the various plates 1 are joined together by brazing.

[0019] By setting the flow-blocking part 3 to separate the brazing filler metal 4 from the functional area 2, the brazing process of the plate 1 can be effectively prevented from flowing into the functional area 2, thus ensuring the performance of the functional area 2.

[0020] Specifically, such as Figure 2 and Figure 3 As shown, there is a gap between the flow-blocking part 3 and the functional area 2; the width W2 of the gap is in the range of 0-3mm, preferably 1-2mm. That is, when the flow-blocking part 3 is processed and set, it is placed at a certain distance from the functional area 2, thereby separating the flow-blocking part 3 from the functional area 2 and avoiding mutual interference between the flow-blocking part 3 and the functional area 2. If there is no gap between the flow-blocking part 3 and the functional area 2, and the flow-blocking part 3 is directly connected to the functional area 2, the processing of the flow-blocking part 3 may easily cause damage to the functional area 2; and when the functional area 2 is working, the material flowing through the functional area 2 will also affect the flow-blocking part 3.

[0021] Specifically, when the flow-blocking part 3 is a groove structure, the flow-blocking part 3 surrounds the functional area 2, that is, the groove structure is a flow-blocking groove 6 provided on two mutually adapted and joined plates 1; a flow-blocking component 7 is provided in the flow-blocking groove 6. The flow-blocking component 7 can be a flow-blocking strip or flow-blocking tape, etc., which can be installed in the flow-blocking groove 6. The flow-blocking component 7 fills the flow-blocking groove 6 on the two plates 1. When the two plates 1 are stacked together, the flow-blocking component 7 is pressed tightly in the flow-blocking groove 6, thereby forming a barrier structure between the functional area 2 and the brazing filler metal 4. When installing the flow-blocking component 7, the flow-blocking component 7 is installed into the flow-blocking groove 6 of one of the plates. The size of the flow-blocking component 7 is adapted to the size of the flow-blocking groove 6. In order to facilitate the installation of the flow-blocking component 7 into the flow-blocking groove 6, when installing the flow-blocking component 7, one end of the flow-blocking component 7 can be inserted into the flow-blocking groove 6 and fixed first, and then the flow-blocking component 7 can be gradually installed into the flow-blocking groove 6. In this case, the width W1 of the flow-blocking groove 6 is 0.2-2 mm, preferably 0.5-1 mm; the depth H1 of the flow-blocking groove 6 is 0.3-3 mm, preferably 1-2 mm. The height H2 of the flow-blocking element 7 is between the depth H1 of the flow-blocking groove 6 and twice the depth 2H1 of the flow-blocking groove 6. Preferably, the height H2 of the flow-blocking element 7 is less than 0.2 mm smaller than twice the depth 2H1 of the flow-blocking groove 6, i.e., 0 < 2H1 - H2 ≤ 0.2 mm; more preferably, it is less than 0.1 mm smaller, i.e., 0 < 2H1 - H2 ≤ 0.1 mm; and even more preferably, it is equal to 0.05 mm, i.e., 2H1 - H2 = 0.05 mm. Here, two specific embodiments of the flow-blocking element 7 are described. 1. The flow-blocking component 7 is made of foil-shaped stainless steel soft steel strip. The stainless steel soft steel strip is cut to a suitable length according to the dimensions of the flow-blocking groove 6 and the dimensions of the stainless steel soft steel strip. Simultaneously, the surface of the stainless steel soft steel strip is polished with coarse sandpaper to remove the oxide layer and create a capillary texture. One end of the stainless steel soft steel strip is inserted into the flow-blocking groove 6 and can be lightly spot-welded for fixation. The stainless steel soft steel strip is gradually inserted into the flow-blocking groove 6 until the entire flow-blocking groove 6 is filled. 2. If the flow-blocking component 7 is made of stainless steel sheet through machining, it can be directly inserted into the flow-blocking groove 6.

[0022] In addition, such as Figure 4 and Figure 5 As shown, when the flow-blocking portions 3 of two mutually fitted and joined plates 1 are respectively provided with corresponding flow-blocking grooves 6 and flow-blocking protrusions 8, the flow-blocking protrusions 8 and flow-blocking grooves 6 cooperate with each other to form a barrier structure between the functional area 2 and the solder 4 in the two plates 1. Here, the height H3 of the flow-blocking protrusion 8 is less than the depth H1 of the flow-blocking groove 6. Preferably, the height difference between the height H3 of the flow-blocking protrusion 8 and the depth H1 of the flow-blocking groove 6 is less than or equal to 0.2 mm, that is, 0 < H1 - H3 ≤ 0.2 mm; more preferably, it is less than or equal to 0.1 mm, that is, 0 < H1 - H3 ≤ 0.1 mm; and even more preferably, it is equal to 0.05 mm, that is, H1 - H3 ≤ 0.05 mm.

[0023] In addition, such as Figure 6 and Figure 7 As shown, during step S2, a brazing surface 9 is processed on the mating surface of the plate 1, making the brazing surface 9 lower than the functional area surface of the functional area 2 and forming a step 10 with a height difference. The height H4 of the step 10 is 0.01-0.1 mm, preferably 0.05 mm. Correspondingly, the step 10 constitutes a flow-blocking part 3. When the two plates 1 are joined, in order to form a receiving area 11 between the mating surfaces of the two plates 1 that can accommodate the brazing filler metal 4, the receiving area 11 increases the contact area between the brazing filler metal 4 and the plate 1, thereby making the brazing connection between the brazing filler metal 4 and the plate 1 more favorable. The step 10 connects the brazing surface 9 and the functional area surface through an inclined surface with an inclination angle of 30°-60°. The inclination angles of the inclined surfaces of the two plates 1 are different, so that when the two plates 1 are joined, an intervening area is formed between the inclined surfaces of one plate 1 and the inclined surfaces of the other plate 1, and this intervening area serves as the receiving area 11.

[0024] In addition, such as Figure 8 and Figure 9 As shown, the flow-blocking part 3 can also be a combination of the aforementioned step 10 and the flow-blocking groove 6. The flow-blocking groove 6 is located below the step 10 and is arranged around the edge of the brazing surface 9. During the bonding and installation of the plate 1, the brazing filler metal 4 on the brazing surface 9 is squeezed and flows into the flow-blocking groove 6, improving the effect of blocking the brazing filler metal 4.

[0025] In a preferred embodiment, the plate 1 is made of stainless steel, and the brazing filler metal 4 is a nickel-based filler metal 4, which is provided as a paste or foil. The thickness of the filler metal 4 is 0.02-0.2 mm, preferably 0.05-0.15 mm. The filler metal 4 can be applied to the brazing surface 9 of one of the plates 1 or to both brazing surfaces 9 of the plates 1. When applying the filler metal 4, the volume of the filler metal 4 can be calculated by the area to be coated and the thickness of the coating, and then the coating can be applied accurately. Preferably, the volume of the filler metal 4 used is 1.01-1.2 times the calculated volume of the filler metal 4.

[0026] Based on the brazing method disclosed in the above embodiments, this embodiment also discloses a multilayer board, including at least two boards 1, wherein each board 1 is connected to the other by the above brazing method.

[0027] Based on the brazing method disclosed in the above embodiments, such as Figures 10 to 12 As shown, this embodiment also discloses a structure to prevent brazing filler metal from flowing into the flow channel functional area, including a main flow channel 12 and a branch flow channel 13; the main flow channel 12 and the branch flow channel 13 are connected by the above-described brazing method.

[0028] In this embodiment, a fluid channel groove 14 is provided in the functional area 2, and the fluid channel grooves 14 of the two mating plates 1 correspond to form a fluid channel 15. A positioning pin hole 16 is opened on the brazing surface 9. When the two mating plates 1 are joined, a positioning pin is first inserted into the positioning pin hole 16 of one plate 1, with a part of the positioning pin protruding from the positioning pin hole 16. Then, the positioning pin hole 16 of the other plate 1 is aligned with the positioning pin position and installed, thereby achieving accurate positioning and installation of the two plates 1.

[0029] In this embodiment, the structure to prevent brazing filler metal from flowing into the flow channel functional area further includes a clamp 17 for fixing each plate 1. The clamp 17 includes a through hole 18 penetrating the plate 1, a bolt 19, and a nut 20. The plate 1 has a boss surrounding the through hole 18 to prevent the plate 1 from deforming due to the clamping force of the clamp 17. The boss can be a support step on the plate 1 or a washer set at a corresponding position. Preferably, the head of the bolt 19 or the nut 20 covers 0.6-1.2 of the boss's projected area on the plate 1. When the clamp 17 fixes the plate 1, the bolt 19 can be connected to the nut 20 through the through hole 18 to complete the clamping and fixing of each plate 1.

[0030] Furthermore, the clamp 17 can also be implemented as follows: it includes a threaded hole 21 provided in an outer plate 1, a through hole 18 provided in the remaining plates 1 and connected to the threaded hole 21, and a bolt 19, wherein the bolt 19 passes through the through hole 18 and is threaded to the threaded hole 21 to fix each plate 1. Preferably, a brazing filler layer is provided on the outside of the bolt 19, the thickness of which is 0.01-0.3 mm, preferably 0.05-0.1 mm.

[0031] In this embodiment, the main flow channel 12 has a two-layer structure, and the diversion channel 13 has a three-layer structure.

[0032] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.

Claims

1. A brazing method comprising at least two mutually adaptable and interlocking plates; characterized in that: Process according to the following steps: S1 is the functional area for processing the joint surfaces of various plates; S2, a groove structure is provided on the joint surface of at least one plate. The groove structure includes a flow-blocking groove. A flow-blocking element is provided in the flow-blocking groove. The flow-blocking element is made of foil-shaped soft steel strip. The size of the soft steel strip is adapted to the size of the flow-blocking groove. First, a flow-blocking groove is processed on the joint surface of at least one plate, at least around a portion of the functional area. Then, the surface of the soft steel strip is polished to remove the oxide layer and form a capillary texture. Then, one end of the soft steel strip is inserted into the flow-blocking groove and fixed. The soft steel strip is gradually inserted into the flow-blocking groove until the entire flow-blocking groove is inserted. S3, a brazing filler metal is provided on at least a portion of the brazing surface of at least one of the two plates being joined, such that the brazing filler metal is separated from the functional area by a groove structure; S4, stack the boards in sequence; S5 uses a brazing process to bond the various plates together as one unit; There is a gap between the groove structure and the functional area.

2. The brazing method according to claim 1, characterized in that: The joint surfaces of the two plates that fit together have groove structures.

3. The brazing method according to claim 2, characterized in that: The width W1 of the flow-blocking groove is 0.2-2mm, the depth H1 of the flow-blocking groove is 0.3-3mm, and the height H2 of the flow-blocking component is between the depth H1 of the flow-blocking groove and twice the depth 2H1 of the flow-blocking groove.

4. The brazing method according to claim 1, characterized in that: In the two mating plates, one plate has a groove structure on its mating surface, and the other plate has flow-blocking protrusions on its mating surface.

5. The brazing method according to claim 4, characterized in that: The height H3 of the flow-blocking protrusion is less than the depth H1 of the flow-blocking groove.

6. The brazing method according to claim 1, characterized in that: The width W2 of the interval is within the range of 1-2mm.

7. A structure that prevents solder from flowing into the flow channel functional area, including a main flow channel plate and a branch flow channel plate; characterized in that: Both the main channel plate and the branch channel plate are connected by the brazing method as described in any one of claims 1-6.

8. The structure for preventing solder from flowing into the flow channel functional area according to claim 7, characterized in that: Fluid channel grooves are provided in the functional area, and the fluid channel grooves of two mating plates correspond to form a fluid channel.

9. The structure for preventing solder from flowing into the flow channel functional area according to claim 7, characterized in that: Locating pin holes are made on the brazing surface. When two mating plates are joined, the locating pins are inserted into the locating pin holes to position the two plates.

10. The structure for preventing solder from flowing into the flow channel functional area according to claim 7, characterized in that: It also includes clamps for fixing each plate, and the plates are provided with bosses surrounding the through holes.

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