A flat-panel chip expansion fixture

Abstract

This invention discloses a flat-plate chip expansion fixture, relating to the field of expansion fixture technology. It includes a device body comprising a top plate and a bottom plate, with a first floating support and a floating pressure plate positioned between the top and bottom plates via a second floating support on the lower end face of the top plate; a floating pressure head assembly, one end of which is fixed to the lower end face of the top plate, and the other end passing through a corresponding through hole on the floating pressure plate and corresponding to a pre-drilled hole in the workpiece's water pipe; the floating pressure head assembly includes a floating pressure head, a guide sleeve, a floating core rod, a base, and a floating spring; and a workpiece fixing assembly, disposed on the upper end face of the bottom plate, including a fixed contour block, a movable contour block, and a pneumatic cylinder. This invention, through its multi-segment floating structure, reduces the likelihood of water pipe swaying or pressure head misalignment.

Description

Technical Field

[0001] This invention relates to the field of tube expansion tooling technology, and in particular to a flat-panel chip tube expansion tooling. Background Technology

[0002] The stacked aluminum alloy oil cooler uses multiple chips stacked and then brazed. To better braze the inlet and outlet water pipes, the existing process first presses in two water pipes and the chips, fixing the water pipes to the chips and ensuring the required orientation angle before brazing. However, the existing pressing fixture is prone to damage during the pressing of the water pipes, resulting in poor product appearance quality that does not meet customer acceptance standards. Furthermore, the pressing process involves many steps and is cumbersome for employees. Specifically: 1. Using the bottom surface of the chip's inner cavity as the positioning surface makes it prone to damage during pressing; 2. The pressing process involves many steps, making it cumbersome for employees. The reasons for this include: 1. The fixture uses the bottom surface of the chip's inner cavity as the positioning surface, causing the entire product surface to contact the fixture during pressing, resulting in damage. 2. Each of the two water pipes needs to be fitted with a contour block before being placed in the fixture, then the top chip is placed on top, and finally, pressing is performed; after pressing, the two contour blocks need to be removed separately.

[0003] Chinese Patent 202020303326.2 discloses a water pipe positioning fixture mechanism, including a clamping and positioning fixture disposed below a servo press. The clamping and positioning fixture includes a contour positioning plate, a fixing plate, a pressure plate, and a pneumatic gripper disposed on the contour positioning plate. The contour positioning plate is slidably fitted onto the fixing plate. The pressure plate is fixed to the upper end of the contour positioning plate. The lower end of the contour positioning plate has a guide groove with a cylindrical bottom surface. The plate is floatingly connected to the fixing plate via a floating structure. Each of the two movable ends of the pneumatic gripper is equipped with a clamp. The clamp has a first groove with its end face perpendicular to the axis of the guide groove, and a second groove with its end face parallel to the axis of the guide groove. However, this fixture still has problems such as easy damage to the product, low installation efficiency, and easy shaking of the water pipe during the pressing process. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a flat-plate chip expansion fixture. The fixture's structural design prevents the bottom surface of the chip's inner cavity from contacting the fixture, reducing the risk of damage. Furthermore, the multi-segment floating structure minimizes pipe swaying or pressure head misalignment. The fixture is modified to have a dual-mold conforming structure, with cylinders controlling the mold closing and opening. The water pipe can be directly installed onto the conforming position of the fixed mold, resulting in faster installation.

[0005] The specific technical solution is as follows:

[0006] A flat-panel chip expansion fixture includes a device body, which comprises a top plate and a bottom plate, with a first floating support provided between the top plate and the bottom plate.

[0007] A floating pressure plate, wherein the floating pressure plate is disposed on the lower end face of the top plate by a second floating support;

[0008] A floating pressure head assembly is provided, with one end fixed to the lower end face of a top plate and the other end passing through a corresponding through hole in the floating pressure plate and corresponding to the hole position of the tube to be expanded. The floating pressure head assembly includes a floating pressure head, a guide sleeve, a floating core rod, a base, and a floating spring. The base is fixed to the top plate, the guide sleeve is fitted over the lower end of the base and fixedly connected to the lower end of the base, and the floating core rod is disposed inside the guide sleeve and located below the base. The floating spring is disposed between the floating core rod and the base to form a floating gap. The upper end of the floating pressure head is fitted inside the guide sleeve and contacts the floating core rod. The opening diameter of the lower end of the guide sleeve is smaller than the diameter of the upper end of the floating pressure head, and the diameter of the lower end of the floating core rod is smaller than the inner diameter of the guide sleeve. The guide sleeve forms a clearance fit with both the upper end of the floating core rod and the lower end of the base.

[0009] A workpiece fixing assembly, set on the upper surface of a base plate, includes a fixed contour block, a movable contour block, and a pneumatic cylinder. The fixed contour block and the pneumatic cylinder are fixed to the upper surface of the base plate. The movable contour block is located at the movable end of the pneumatic cylinder and can be pushed by the pneumatic cylinder to move toward the fixed contour block and form a contouring fixture with the fixed contour block. The fixed contour block and the movable contour block are separated by the axial centerline of the water pipe with expansion tube. A contouring groove for the chip is formed above the fixed contour block and the movable contour block. The depth of the contouring groove is less than the thickness of the chip.

[0010] Preferably, the corresponding end faces of the floating core rod and the base are provided with grooves for placing the floating spring.

[0011] Preferably, the groove opening is chamfered to avoid restricting the movement of the floating spring.

[0012] Preferably, the guide sleeve is fixed to the base by screws.

[0013] Preferably, the lower end face of the floating core rod has the same diameter as the upper end face of the floating pressure head.

[0014] Preferably, two floating pressure head assemblies are provided, corresponding to the water pipes to be expanded.

[0015] Preferably, the first floating support includes a linear bearing disposed on the top plate, a guide post that slides linearly with the linear bearing and is connected to the bottom plate, and a return spring sleeved on the guide post and located between the bottom plate and the linear bearing. The first floating support is disposed at corresponding end corners of the top plate and the bottom plate. The first floating support and the second floating support have the same structure.

[0016] Preferably, the base plate is provided with a limiting post facing the top plate and used to limit the downward movement distance of the top plate.

[0017] Preferably, the shape and size of the floating pressure plate correspond to the shape and size of the chip.

[0018] This invention, by setting up a three-segment floating structure, enables the floating pressure head and the expansion pipe interface to be accurately and efficiently positioned during the pressing process, overcoming problems such as inaccurate positioning and shaking during the pressing process; the use of contour tooling achieves installation-free operation, saving 30 minutes to 1 hour compared to the previous method; the floating design of the pressing head ensures automatic correction of positional deviations.

[0019] This invention uses a water pipe protrusion within the chip cavity for positioning, ensuring the bottom surface of the chip cavity does not contact the tooling and reducing the risk of damage. The tooling is modified into a dual-mold conforming structure with both moving and stationary molds, using a cylinder to control the closing and opening of the two molds. Furthermore, the water pipe can be directly installed onto the conforming position of the fixed mold in the tooling, reducing processing steps and improving work efficiency. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 This is a front view of the structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the floating pressure head assembly structure;

[0023] Figure 4 yes Figure 2 A bottom view.

[0024] In the attached diagram, 1-top plate, 2-bottom plate, 3-first floating support, 4-floating pressure plate, 5-second floating support, 6-floating pressure head assembly, 7-floating pressure head, 8-guide sleeve, 9-floating core rod, 10-base, 11-floating spring, 12-fixed contour block, 13-moving contour block, 14-pneumatic cylinder, 15-groove, 16-linear bearing, 17-guide post, 18-return spring, 19-limit post, 20-manual valve switch. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "top surface," "bottom surface," "inner," "outer," "inner side," and "outer side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0029] like Figure 1 , 2 As shown in Figure 4, the embodiment discloses a flat chip expansion tool. Here, the chip is an aluminum alloy oil cooler chip / core board that connects to the inlet and outlet water pipes. The chip has holes corresponding to the inlet and outlet water pipes, and there is also a water pipe protrusion in the inner cavity of the chip. The water pipe protrusion is used to block the unused inlet and outlet water ports in the oil cooler. For details about the water pipe protrusion, please refer to the prior art.

[0030] The specific solution of this embodiment includes: device body, floating pressure plate 4, floating pressure head assembly 6 and workpiece fixing assembly.

[0031] The device body includes a top plate 1 and a bottom plate 2, with a first floating support 3 provided between the top plate 1 and the bottom plate 2.

[0032] The floating pressure plate 4 is set on the lower end face of the top plate 1 by the second floating support 5.

[0033] like Figure 2 and Figure 3 As shown, the floating pressure head assembly 6 has one end fixed to the lower end face of the top plate 1, and the other end can pass through the corresponding through hole on the floating pressure plate 4 and correspond to the hole position of the tube to be expanded. The floating pressure head assembly 6 includes a floating pressure head 7, a guide sleeve 8, a floating core rod 9, a base 10, and a floating spring 11. The base 10 is fixed on the top plate 1. The guide sleeve 8 is sleeved outside the lower end of the base 10 and fixedly connected to the lower end of the base 10. The floating core rod 9 is disposed inside the guide sleeve 8 and located below the base 10. The floating spring 11 is disposed between the floating core rod 9 and the base 10 to form a floating gap. The upper end of the floating pressure head 7 is sleeved inside the guide sleeve 8 and contacts the floating core rod 9. The opening diameter of the lower end of the guide sleeve 8 is smaller than the upper end diameter of the floating pressure head 7, and the lower end diameter of the floating core rod 9 is smaller than the inner diameter of the guide sleeve 8; the guide sleeve 8 forms a clearance fit with the upper end of the floating core rod 9 and the lower end of the base 10 respectively. Two floating pressure head components 6 are set up, corresponding to the water pipes to be expanded.

[0034] The workpiece fixing assembly, located on the upper surface of the base plate 2, includes a fixed contour block 12, a movable contour block 13, and a pneumatic cylinder 14. The fixed contour block 12 and the pneumatic cylinder 14 are fixed to the upper surface of the base plate 2. The movable contour block 13 is located at the movable end of the pneumatic cylinder 14 and can be pushed towards the fixed contour block 12 by the pneumatic cylinder 14 to form a contouring fixture with the fixed contour block 12. The fixed contour block 12 and the movable contour block 13 are separated by the axial centerline of the water pipe with the expansion tube. A contouring groove 15 for the chip is formed above the fixed contour block 12 and the movable contour block 13. The depth of the contouring groove 15 is less than the thickness of the chip. The pneumatic cylinder 14 is controlled by a manual valve switch 20 located on the device body.

[0035] Specifically, the device body tooling is mounted on the tooling table of the pneumatic press, the top plate 1 of the device body corresponds to the lower pressure end of the pneumatic press, and the bottom plate 2 of the device body is mounted on the worktable of the pneumatic press by bolts.

[0036] Here, in order to better realize expansion after floating positioning, the corresponding end faces of the floating core rod 9 and the base 10 are provided with grooves 15 corresponding to the placement of the floating spring 11. The opening of the groove 15 is chamfered to avoid restricting the movement of the floating spring 11. This allows the floating core rod 9 and the base 10 to fit together, so that the floating pressure head 7 is fixed after floating positioning, thereby realizing the expansion operation.

[0037] Specifically, the guide sleeve 8 and the base 10 can be fixed with screws for easy maintenance and disassembly.

[0038] Here, to achieve floating positioning, the lower end face of the floating core rod 9 has the same diameter as the upper end face of the floating pressure head 7.

[0039] Here, the first floating support 3 includes a linear bearing 16 disposed on the top plate 1, a guide post 17 linearly slidingly engaged with the linear bearing 16 and connected to the bottom plate 2, and a return spring 18 sleeved on the guide post 17 and located between the bottom plate 2 and the linear bearing 16. The first floating support 3 is disposed at corresponding end corners of the top plate 1 and the bottom plate 2; the first floating support 3 and the second floating support 5 have the same structure. The bottom plate 2 is provided with a limiting post 19 facing the top plate 1 and used to limit the downward movement distance of the top plate 1. The shape and size of the floating pressure plate 4 correspond to the shape and size of the chip.

[0040] In this embodiment, a flat chip expansion fixture is used by first positioning the inlet pipe on the fixed contour block 12, then positioning the outlet pipe on the fixed contour block 12. Next, the manual valve switch 20 is activated to inflate the pneumatic cylinder 14, thereby moving the contour block 13 to fit against the fixed contour block 12. The chip is then positioned on the inlet and outlet pipes. The pneumatic press is activated to press down, thereby pressing down the top plate 1. The top plate 1 moves downward under the guidance of the first floating support 3 and the linear bearing 16, driving the floating pressure plate 4, the second floating support 5, and the floating pressure head assembly 6 to move downward. This causes the floating pressure plate 4 to press the chip tightly, and the floating pressure head 7 of the floating pressure head assembly 6 to be locked under the water pipe and continue to press down, causing the floating pressure head 7 to continue moving downward, thus achieving expansion. The expansion makes the connection between the water pipe and the chip more tightly fitted, fixing and maintaining a fixed angle. After welding is completed, the pneumatic press is lifted upwards. Under the action of the return spring 18, the top plate 1 moves upwards along with the floating pressure plate 4, the second floating support 5, and the floating pressure head assembly 6, thus completing one process. This invention has a rapid positioning and fixing function, which can first expand and fix the water pipe and the chip, thereby effectively improving the subsequent welding quality and thus improving the quality of the product. It has the characteristics of wide applicability and strong practicality.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention. All equivalent changes, substitutions or modifications made within the technical spirit and principles indicated by the present invention should be included within the scope of patent protection covered by the present invention.

Claims

1. A flat-plate chip expansion fixture, comprising a device body, the device body including a top plate and a bottom plate, wherein a first floating support is provided between the top plate and the bottom plate, characterized in that: A floating pressure plate, wherein the floating pressure plate is disposed on the lower end face of the top plate by a second floating support; A floating pressure head assembly, one end of which is fixed to the lower end face of the top plate, and the other end of which can pass through a corresponding through hole in the floating pressure plate and correspond to the hole position of the tube to be expanded; the floating pressure head assembly includes a floating pressure head, a guide sleeve, a floating core rod, a base, and a floating spring. The base is fixed to the top plate, the guide sleeve is sleeved outside the lower end of the base and fixedly connected to the lower end of the base, the floating core rod is disposed inside the guide sleeve and located below the base; the floating spring is disposed between the floating core rod and the base to form a floating gap; the upper end of the floating pressure head is sleeved on the guide sleeve. The guide sleeve is inserted into the sleeve and contacts the floating core rod. The diameter of the lower opening of the guide sleeve is smaller than the diameter of the upper end of the floating pressure head, and the diameter of the lower end of the floating core rod is smaller than the inner diameter of the guide sleeve. The guide sleeve forms a clearance fit with the upper end of the floating core rod and the lower end of the base. The corresponding end faces of the floating core rod and the base are provided with grooves corresponding to the placement of the floating spring. The lower end face of the floating core rod has the same diameter as the upper end face of the floating pressure head. Two floating pressure head assemblies are provided, corresponding to the water pipes to be expanded. The shape and size of the floating pressure plate correspond to the shape and size of the chip. A workpiece fixing assembly, set on the upper surface of a base plate, includes a fixed contour block, a movable contour block, and a pneumatic cylinder. The fixed contour block and the pneumatic cylinder are fixed to the upper surface of the base plate. The movable contour block is located at the movable end of the pneumatic cylinder and can be pushed by the pneumatic cylinder to move toward the fixed contour block and form a contouring fixture with the fixed contour block. The fixed contour block and the movable contour block are separated by the axial centerline of the water pipe with expansion tube. A contouring groove for the chip is formed above the fixed contour block and the movable contour block. The depth of the contouring groove is less than the thickness of the chip.

2. The flat-panel chip expansion fixture according to claim 1, characterized in that: The groove opening is beveled to avoid restricting the movement of the floating spring.

3. The flat-panel chip expansion fixture according to claim 1, characterized in that: The guide sleeve is fixed to the base with screws.

4. The flat-plate chip expansion fixture according to claim 1, characterized in that: The first floating support includes a linear bearing disposed on the top plate, a guide post that slides linearly with the linear bearing and is connected to the bottom plate, and a return spring sleeved on the guide post and located between the bottom plate and the linear bearing. The first floating support is disposed at the corresponding end corners of the top plate and the bottom plate. The first floating support and the second floating support have the same structure.

5. The flat-panel chip expansion fixture according to claim 1, characterized in that: The base plate is provided with a limiting post facing the top plate and used to limit the downward movement distance of the top plate.

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