A universal parallel seam welding fixture

Abstract

The present invention discloses a universal parallel seam welding fixture, comprising a liftable structure adjustably connected between a base and a platform; slideways are provided on the inner side surfaces of two opposing outer frames of the base; the liftable structure comprises a movable frame, a connecting rod structure, and an adjustment knob rotatable about a central axis; protrusions are cooperatively provided on the outer side surfaces of two opposing side frames of the movable frame, which can move horizontally along the slideways; the connecting rod structure comprises a first fixed block, a second fixed block, a first connecting rod, and a second connecting rod; the adjustment knob is axially fixed to the base and interconnected with the movable frame housed in the inner space of the base's outer frame via threads. This fixture is suitable for packaging circuits of various specifications, especially circuits with irregular substrates or housings, and has good versatility.

Description

Technical Field

[0001] The invention relates to a fixture, in particular to a universal parallel seam welding fixture. Background Art

[0002] The parallel seam welding process is widely used in various electronic packaging with airtightness requirements. The parallel seam welding packaging process uses a parallel seam welding machine to generate extremely high-density heat energy at the contact point between the seam welding electrode cone surface and the edge of the shell cover through high current pulses, so that the local metal body and the coating of the shell 100 and the cover 200 are quickly heated and fused together. As the electrode continues to roll forward on the edge of the cover, the fusion points are continuously formed into a dense weld bead. After the weld bead is closed, the airtight packaging is achieved. Figure 1 Parallel seam welding is generally only used for shell sealing welding of thin cover plates with regular shapes such as rectangular or circular edges.

[0003] Typically, the working trajectories of the two electrodes of a parallel seam welder are symmetrically distributed and have an appropriate working height range. Therefore, there are requirements for the horizontal position and height of the geometric center of the package cover. When using a parallel seam welder, a specific fixture is required to fix the circuit to be packaged so that the conical surface of the parallel seam welder electrode can make good contact with the edge of the shell cover. Typically, customized parallel seam welding fixtures are required for different types of packaged circuits. However, there are now many different types of packaged circuits. If a customized parallel seam welding fixture is required for each type of package and each size of shell, it will increase production costs.

[0004] The main parallel seam welding clamps currently have the following typical categories:

[0005] A parallel seam welding fixture (invention patent, application number 201610911773.4);

[0006] Introduction: The present invention has the advantages of simple structure, easy use, and low manufacturing cost. In particular, through the corresponding cooperation of limit plates I and II on the fixture body and limit plate III on the horizontal plane and the installation of different pads as needed, it can complete the parallel seam welding packaging of various types of tube shells such as FP, QFP, DIP, BGA / PGA, etc. This not only reduces the number of special fixtures for parallel seam welding and reduces scientific research and production manufacturing costs, but also shortens the scientific research and production cycle and avoids the increase of tooling processing costs and management costs.

[0007] Disadvantages: 1. The height adjustment of the parallel seam welding fixture is achieved by adding a pad. When adjusting the height inside the parallel seam welding machine, the operation is complicated and continuous height adjustment is not possible;

[0008] 2. The parallel seam welding fixture cannot effectively fix irregular substrates or shells, and it is difficult to find the geometric center of the packaged parts;

[0009] 3. The parallel seam welding fixture still requires an additional device to fix the cover plate.

[0010] A fixture for parallel seam welding (utility model patent, application number 201420818702.6);

[0011] Summary: This utility model discloses a fixture for parallel seam welding, comprising a parallel seam welding platform and a fixture body fixed to the platform. The center of the fixture body is provided with a placement slot for placing the shell to be welded and a removal slot for removing the shell. The fixture body is an incomplete cylinder with cut surfaces on its left and right sides. This fixture allows for quick and accurate clamping and positioning, and once positioned, parts can be welded smoothly.

[0012] Disadvantages: This parallel seam welding fixture is only suitable for parallel seam welding of one type of circuit.

[0013] Adjustable parallel seam welding fixture (utility model patent, application number 201420288019.6);

[0014] Introduction: This utility model features a simple structure, low processing costs, easy operation, and high control precision. A single fixture can accommodate multi-module packaging applications, significantly improving production efficiency. Through adjustment and configuration, it solves the challenge of finding the geometric center of the component to be packaged during the parallel seam welding process. This allows a single fixture to be designed to package multiple modules, enabling multiple processing steps for multiple semi-finished modules to be completed using a single fixture. This reduces costs, shortens processing time, and improves production efficiency.

[0015] Disadvantages: 1. The parallel seam welding fixture cannot be adjusted in height;

[0016] 2. The parallel seam welding fixture cannot effectively fix irregular substrates or shells;

[0017] 3. The parallel seam welding fixture still requires an additional device to fix the cover plate.

[0018] An adjustable parallel seam welding fixture for surface-mounted ceramic housings (invention patent, application number 201811277015.7).

[0019] Introduction: The ceramic housing fixture of the present invention has the following advantages:

[0020] 1) An adjustable parallel seam welding fixture for surface mount ceramic housings with a simple and reasonable structural design;

[0021] 2) The present invention designs a flexible adjustable fixing device, and cooperates with a spring fixing component to realize the loading and fixing of surface mount ceramic housings of different dimensions. No additional customized fixtures are required, which ensures the smooth progress of the packaging process, improves production efficiency and reduces production costs.

[0022] Disadvantages: 1. The parallel seam welding fixture cannot be adjusted in height;

[0023] 2. The parallel seam welding fixture cannot effectively fix irregular substrates or shells, and it is difficult to find the geometric center of the packaged parts;

[0024] 3. The parallel seam welding fixture still requires an additional device to fix the cover plate. Summary of the Invention

[0025] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a universal parallel seam welding fixture, which is suitable for packaging circuits of various specifications, especially circuits with irregular substrates or shells, and has good versatility.

[0026] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0027] A universal parallel seam welding fixture includes a liftable structure adjustably connected between a base and a platform;

[0028] Slideways are provided on the inner sides of two opposite outer frames of the base;

[0029] The liftable structure includes a movable frame, a connecting rod structure and an adjusting knob that can rotate around a central axis;

[0030] The outer sides of two opposite frames of the movable frame are cooperatively provided with protruding structures that can move horizontally along the slideway;

[0031] The connecting rod structure includes a first fixed block, a second fixed block, a first connecting rod and a second connecting rod; one end of the first connecting rod is connected to the midpoint of the second connecting rod via a rotatable node, the other end of the first connecting rod is connected to the first fixed block via a rotatable node, one end of the second connecting rod is connected to the movable frame via a rotatable node, and the other end of the second connecting rod is connected to the second fixed block via a rotatable node; the first fixed block is connected and fixed to the outer frame of the base; the second fixed block is connected and fixed to the platform;

[0032] The adjusting knob is axially fixed on the base and is interconnected with a movable frame accommodated in the inner space of the outer frame of the base through a thread.

[0033] Furthermore, a plurality of magnets are provided inside the platform; the position fixer is connected to the upper surface of the platform by the magnetic force of the magnets.

[0034] Furthermore, the axial center distances between adjacent rotatable nodes on the first connecting rod and the second connecting rod are equal.

[0035] Furthermore, each rotatable node is a rotation node with hole-shaft clearance fit.

[0036] Furthermore, each rotatable node rotates around the central axis of the hole or shaft.

[0037] Furthermore, the holes or axes at the rotatable nodes are parallel to each other.

[0038] Furthermore, the connecting rod structure is composed of four groups, which are symmetrically connected to both sides of the movable frame.

[0039] Furthermore, scale lines are provided on the upper surface of the platform.

[0040] Furthermore, the position fixer is L-shaped or cylindrical.

[0041] Furthermore, the base is fixed on a movable operating table of the parallel seam welding machine.

[0042] The beneficial effects achieved by the present invention are:

[0043] (a) Continuous height adjustment is possible and easy to operate;

[0044] (b) With the help of the scale lines, the geometric center of the cover slip can be easily found;

[0045] (c) For circuits with irregular base or housing, fixation can also be achieved through multiple position fixators;

[0046] (b) No additional device is required to fix the housing cover, thereby avoiding the possibility of mechanical damage to the housing cover due to fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the parallel seam welding packaging process in the prior art;

[0048] Figure 2 Assembly diagram of the parallel seam welding fixture of this embodiment;

[0049] Figure 3 In this embodiment Figure 2 Schematic diagram behind the hidden platform;

[0050] Figure 4 In this embodiment Figure 3 Schematic diagram from above;

[0051] Figure 5 Assembly diagram of the lifting structure of the parallel seam welding fixture of this embodiment;

[0052] Figure 6 Assembly diagram of the parallel seam welding fixture base of this embodiment;

[0053] Figure 7 Assembly diagram of the connecting rod structure of the parallel seam welding fixture of this embodiment;

[0054] Figure 8 Schematic diagram of the parallel seam welding fixture parts of this embodiment;

[0055] Figure 9 Schematic diagram of connecting rod spacing.

[0056] In the picture:

[0057] 1. Base; 11. Slide; 12. Positioning hole;

[0058] 2. Liftable structure;

[0059] 3. Platform;

[0060] 4. Position fixer; 41. L-shaped position fixer; 42. Cylindrical position fixer;

[0061] 5. External frame; 51. Step surface;

[0062] 6. Baffle;

[0063] 7. Screws;

[0064] 8. Movable frame; 81. Raised structure; 82. Bolt hole;

[0065] 9. Connecting rod structure; 911, 912, 913, 914, bolts; 921, 922, fixing blocks; 93, connecting rod; 94, connecting rod;

[0066] 10. Stud knob; 14. Magnet; 15. Scale line. DETAILED DESCRIPTION

[0067] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0068] Combine Figures 2 to 7 The main structure of this device includes a base 1, a liftable structure 2, a platform 3 and a position fixer 4.

[0069] The liftable structure 2 is connected to the base 1 and the platform 3 by screws and studs, and the position holder 4 and the platform 3 are connected to each other by magnetic attraction. The total height of the fixture is controlled by adjusting the liftable structure 2.

[0070] The base 1 comprises an outer frame 5 and baffles 6. Positioning holes 12 are provided through the outer frame 5 and baffles 6, through which the base 1 is secured to the movable operating table of the parallel seam welder. The baffles 6 are connected to the outer frame 5 via screws 7. Two baffles 6 are positioned on opposite sides of the outer frame 5, forming a slideway 11 with the outer frame 5 to accommodate the raised structure 81 and support the raised structure 81 of the movable frame 8.

[0071] The liftable structure 2 is composed of a movable frame 8, a connecting rod structure 9, and a stud knob 10. The connecting rod structure 9 is connected to the bolt hole 82 on the movable frame 8 by a bolt 911. Two opposing sides of the movable frame 8 are provided with a raised structure 81, which is mounted on the slide 11 of the base. The stud knob 10 is axially fixed to the outer frame 5 of the base 1 and can rotate around the central axis of the stud knob. It is interconnected with the movable frame 8 by a thread. By controlling the rotation of the stud knob 10 and adjusting the position of the threaded movable frame 8, the movable frame 8 can be moved horizontally along the slide 11.

[0072] The connecting rod structure 9 consists of a fixed block 92, a first connecting rod 93, a second connecting rod 94, and bolts. One end of the first connecting rod 93 is rotatably connected to the second connecting rod 94 via a bolt 913. The other end of the first connecting rod 93 is rotatably connected to the first fixed block 921 via a bolt 912. One end of the second connecting rod 94 is rotatably connected to the second fixed block 922 via a bolt 914, and the other end of the second connecting rod 94 is rotatably connected to the side threaded hole 82 of the movable frame 8 via a bolt 911. The first fixed block 921 is screwed to the stepped surface 52 at the bottom of the base 1. The second fixed block 922 is screwed to the platform 3 and fixed thereto. The first connecting rod 93 has two parallel bolt holes for mounting bolts 912 and 913, respectively. The second connecting rod 94 has three bolt holes for mounting bolts 911, 913, and 914, respectively. The axial center distance X between adjacent bolt holes is equal. The bolts 912 interconnected with the first fixed block 921 and the bolts 911 interconnected with the movable frame 8 are located at the same level. Each rotatable node in the connecting rod structure 9 rotates around the axis of the bolt or bolt hole at the corresponding node.

[0073] In other embodiments, the bolts may also be replaced by other parts.

[0074] A plurality of magnets 14 are evenly distributed inside the platform 3. Scale lines 15 are made on the upper surface of the platform 3.

[0075] The position holder 4 is made of metal iron, coated with an anti-rust layer and passivated on the edges and corners. It is interconnected with the magnet 15 inside the platform 3 through magnetic attraction, and the position holder 4 is sucked onto the surface of the platform 3.

[0076] Assembly of parallel seam welding fixture:

[0077] (a) Connect the four connecting rod structures 9 to the movable frame 8 via bolts 911;

[0078] (b) connecting the movable frame 8 and the base 1 via a slideway 11 formed by the outer frame 5 and the baffle 6;

[0079] (c) connecting the movable frame 8 and the base 1 with the stud knob 10;

[0080] (d) Connect the first fixing block 921 to the base 1 with screws;

[0081] (e) Connect the second fixing block 922 to the platform 3 with screws;

[0082] (f) Place the position holder 4 on the platform 3 to complete the assembly of the parallel seam welding fixture.

[0083] (1) Overall dimensions

[0084] The fixture should be smaller than or equal to the maximum fixture size that can be loaded by the parallel seam welding machine and should not affect the movement of the parallel seam welding machine's stage.

[0085] For example, the SM8500 parallel seam welding machine can load a maximum fixture size of 200mm.

[0086] (2) The size and spacing of the positioning holes 12 on the base.

[0087] Depends on the model of parallel seam welding machine.

[0088] For example, in the SM8500 parallel seam welding machine, the size of the positioning hole 12 is Ø6.4±0.05mm, the center distance of the positioning hole 12 is 101.6±0.01mm, and the hole depth is greater than 6mm.

[0089] (3) Base, connecting rod, platform

[0090] The main structure of the base, connecting rods and platform are all stainless steel.

[0091] The minimum height of the fixture is the sum of the heights of base 1 and platform 3. Maximum height is achieved when the connecting rod angle is 0. The appropriate connecting rod size, base height, and platform height should be selected based on the model of the parallel seam welder and the type of packaged circuit. The axial center distance of the bolt holes on connecting rods 93 and 94 must be consistent. The platform must have sufficient support strength, and the internal height of platform 3 must be sufficient to accommodate the embedded magnet 14.

[0092] For example, for the SM8500 parallel seam welder, for MCM-C (MCM-Ceramic, ceramic multi-chip module or ceramic thick film multi-chip module) type package circuit, the appropriate dimensions are: base height 10mm, platform height 5mm, and bolt hole axis distance 14mm.

[0093] (4) Round magnet

[0094] The magnet should be of a standard size that can be embedded in the platform and provide sufficient magnetic force to attract and fix the fixture and cover. The diameter of a standard round magnet is between 5mm and 40mm, and the thickness is between 1.5mm and 8mm.

[0095] (5) Position fixer

[0096] The position holder 4 is made of metal iron, coated with an anti-rust layer and passivated on the edges and corners.

[0097] The size, height and shape of the positioner are determined by the structure of the circuit to be packaged. The size of the positioner must not be larger than the packaged circuit, and the height must not be higher than the position of the packaged circuit cover.

[0098] For circuits with rectangular substrates or housings, L-shaped position holders 41 can be used for fixation; for circuits with irregular substrates or housings, cylindrical position holders 42 can be used for fixation. For MCM-C type circuits, the appropriate height of the position holder is equal to the height of the ceramic substrate.

[0099] Designing and manufacturing a set of commonly used L-shaped and cylindrical position fixers 41, 42 of different sizes can meet the fixing requirements of most circuits.

[0100] For some special packaged circuits, such as those with leads or pins, it is necessary to design and manufacture specific position fixers. However, the design and manufacturing costs of such position fixers are very low and the production cycle is short.

[0101] (1) The position fixer 4 is moved to a suitable position for fixing the circuit to be packaged, and the circuit to be packaged is determined to be in a suitable packaging position by the scale line. The housing cover of the circuit to be packaged is directly fixed by magnetic attraction.

[0102] (2) By rotating the stud knob to control the total height of the parallel seam welding fixture and the packaged circuit, the edge of the shell cover is at an appropriate height position to successfully complete the parallel seam welding of the circuit.

[0103] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A universal parallel seam welding fixture, characterized by: including a liftable structure adjustably connected between a base and a platform; Slideways are provided on the inner sides of two opposite outer frames of the base; The liftable structure includes a movable frame, a connecting rod structure and an adjusting knob that can rotate around a central axis; The outer sides of two opposite frames of the movable frame are cooperatively provided with protruding structures that can move horizontally along the slideway; The connecting rod structure includes a first fixed block, a second fixed block, a first connecting rod and a second connecting rod; one end of the first connecting rod is connected to the midpoint of the second connecting rod via a rotatable node, the other end of the first connecting rod is connected to the first fixed block via a rotatable node, one end of the second connecting rod is connected to the movable frame via a rotatable node, and the other end of the second connecting rod is connected to the second fixed block via a rotatable node; the first fixed block is connected and fixed to the outer frame of the base; the second fixed block is connected and fixed to the platform; The adjusting knob is axially arranged on the base and is interconnected with the movable frame accommodated in the inner space of the outer frame of the base via a thread; Multiple magnets are arranged inside the platform; The position fixer is connected to the surface of the platform by the magnetic force of the magnet; The connecting rod structure consists of four groups, which are symmetrically connected to both sides of the movable frame.

2. The universal parallel seam welding fixture according to claim 1 is characterized in that: The axial center distances between adjacent rotatable nodes on the second connecting rod are equal.

3. The universal parallel seam welding fixture according to claim 1 is characterized in that: Each rotatable node is a rotation node with hole-shaft clearance fit.

4. The universal parallel seam welding fixture according to claim 3 is characterized in that: Each rotatable node rotates around the central axis of the hole or shaft.

5. The universal parallel seam welding fixture according to claim 3 is characterized in that: The holes or shafts at the rotatable nodes are parallel to each other.

6. The universal parallel seam welding fixture according to claim 1 is characterized in that: Scale lines are arranged on the upper surface of the platform.

7. The universal parallel seam welding fixture according to claim 1 is characterized in that: The position fixer is L-shaped or cylindrical.

8. The universal parallel seam welding fixture according to claim 1 is characterized in that: The base is fixed on a movable operating table of the parallel seam welding machine.

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