Air window strip stamping die

Abstract

The utility model discloses an air window strip stamping die which comprises a bottom plate, a middle push rod assembly, two end push rod assemblies and six sets of stamping work modules, and the six sets of stamping work modules are arranged on the bottom plate in an arc shape in the X direction and the Z direction and used for stamping all holes and bosses of an air window strip at a time. And the middle push rod assembly and the two-end push rod assembly are matched to take out the stamped air window strip from the die. By means of the stamping die, holes and bosses of all air window strips can be machined at a time, the number of used dies and the occupied time of stamping equipment are reduced, and the stamping work efficiency is improved. And the rolling and stretch bending processes are matched, so that the process route of the air window strip can be greatly shortened, the subsequent off-line shaping procedure is not needed, and the production efficiency of the air window strip is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile exterior decoration parts, in particular to a windshield strip stamping die. Background Art

[0002] Windshield strips are automotive exterior trims installed on both sides of the front windshield. They are mainly used to fix sealing strips. Their main functions are to prevent water leakage and dust, and to make the car beautiful. At the same time, they have a certain function of reducing external noise, providing a quiet environment for driving in the car.

[0003] The windshield strip is an assembly part. The plastic sealing strip needs to be installed into the car body through the windshield strip slot. Therefore, there are requirements for the windshield strip's clipping position, clip node strength, installation force and removal force during assembly. The windshield strip has a 3D curvature, that is, it has curvature in the X and Z directions of the body coordinate system. The windshield strip has multiple holes and multiple triangular bosses. Generally, a windshield strip has 5-6 holes (including at least one round hole and the rest are waist holes) and 12-16 triangular bosses. Due to the strength requirements of the triangular boss, it is necessary to ensure that the insertion and removal of the plastic strip 5 times will not affect the tightness of the clip. Therefore, the material of the windshield strip is generally hardened stainless steel 304-3 / 4H, and the material tensile strength is 1150-1300MPa.

[0004] The processing technology of windshield strips generally includes pure stamping process and rolling + bending + stamping process. Due to the above-mentioned characteristics of windshield strips, the stamping die structure used in the pure stamping process is complex and the processing difficulty is high. Generally, 6-7 stamping processes are required and combined with subsequent multiple manual shaping processes to meet the part size. Therefore, the pure stamping process is used to process windshield strips, which requires more manpower, long molding time, and high tooling costs, and cannot meet the needs of modern intelligent manufacturing of automobiles.

[0005] The rolling + bending + stamping process is a new processing technology developed on the basis of pure stamping process. The windshield strips are first processed by rolling and stretching, and then all the holes and bosses of the windshield strips are processed at one time by stamping process. It can greatly reduce the number of molds and the occupancy time of stamping equipment, shorten the process route, and do not require subsequent offline shaping process, which greatly improves production efficiency. Therefore, it is of great significance to develop a stamping die that can process all the holes and bosses of windshield strips at one time. Summary of the invention

[0006] In order to achieve the above-mentioned purpose, the utility model provides a windshield strip stamping die.

[0007] The technical solution adopted by the utility model is:

[0008] A windshield strip stamping die comprises a bottom plate, a middle push rod assembly, two end push rod assemblies and 6 groups of stamping working modules, the 6 groups of stamping working modules are arranged in an arc shape on the bottom plate in the X direction and the Z direction, and a push rod movable gap is provided between two adjacent groups of stamping working modules;

[0009] The middle push rod assembly includes a push rod connecting plate, 5 push rods A and a push rod cylinder A; the push rod cylinder A is installed on the rear side of the stamping working module, and the cylinder piston rod extends forward to connect the push rod connecting plate. One end of the 5 push rods A is fixed on the push rod connecting plate, and the other end extends to the 5 gaps of the 6 groups of stamping working modules respectively;

[0010] The push rod assemblies at both ends have the same structure, both including a push rod cylinder B, a push rod seat B and two small push rods. The two push rod cylinders B are respectively installed on both sides of the 6 groups of stamping working modules. The cylinder piston rod extends forward to connect the push rod seat B. One end of the push rod seat B is rotatably mounted on the base plate through a rotating shaft, and the two small push rods are fixedly mounted on the push rod seat B.

[0011] The six sets of stamping working modules are used to stamp out all holes and bosses of the wind window strip at one time, and the middle push rod assembly and the push rod assemblies at both ends cooperate to remove the stamped wind window strip from the mold.

[0012] Furthermore, each group of stamping working modules includes an oil cylinder, a pressure block, a punch fixing plate, a longitudinal adjustment mounting plate, a transverse adjustment mounting plate, a height adjustment mounting plate, a lower die frame, three boss punches, a hole punch, three boss dies and a hole die; the longitudinal adjustment mounting plate is installed on the bottom plate to adjust the Y-axis position of the mold, the transverse adjustment mounting plate is installed on the longitudinal adjustment mounting plate to adjust the X-axis position of the mold, the height adjustment mounting plate is installed on the transverse adjustment mounting plate to adjust the Z-axis position of the mold, the oil cylinder is installed on the height adjustment mounting plate through the oil cylinder bracket, the oil cylinder piston rod extends vertically downward to connect the pressure block, the bottom rear side of the punch fixing plate is connected to the square guide column, the square guide column can be slidably installed in the guide frame, the guide frame is fixedly installed on the height adjustment mounting plate, a reset spring is provided between the square guide column and the guide frame, the three boss punches and one hole punch are all fixed on the punch fixing plate, the lower die frame is installed on the height adjustment mounting plate, the three boss dies and one hole die are fixedly installed in the lower die frame and correspond to the three boss punches and one hole punch respectively.

[0013] The curvature of the 6 stamping working modules in the X direction is adjusted by coordinating the longitudinal adjustment mounting plate and the transverse adjustment mounting plate, and the curvature of the 6 stamping working modules in the Z direction is adjusted by the height adjustment mounting plate to adapt to the 3D curvature of the windshield strip; the oil cylinder drives the punch fixing plate to press down through the pressing block, and the three boss punches cooperate with the three boss dies respectively to stamp out the three boss structures of the windshield strip, and the hole punch cooperates with the hole die to stamp out the round hole or waist-shaped hole of the windshield strip. After the stamping is completed, the oil cylinder piston rod retracts, and the punch fixing plate returns to its initial position under the action of the reset spring. Through the above 6 sets of stamping working modules, all boss and hole structures on the windshield strip can be stamped out in one go.

[0014] Furthermore, two side baffles and a pressing plate are fixedly installed on the lower front side of the punch fixing plate. The lower ends of the side baffles, the boss punch and the hole punch all pass through the pressing plate. The side baffles are used to support the windshield strip from the side when the cylinder moves downward; the pressing plate is used to press the stamping surface of the windshield strip against the die when the cylinder moves downward.

[0015] Furthermore, a cylinder sensor is provided on the cylinder, and the cylinder sensor is used to control the stroke of the cylinder, thereby improving the stamping quality and work efficiency.

[0016] Furthermore, a PLC controller is included, and push rod cylinder A, push rod cylinder B and oil cylinder sensor are all connected to the PLC controller. The PLC controller is used to control the oil cylinder to go down to the sensing position, and then the oil cylinder rises, and then push rod cylinder A and push rod cylinder B act at the same time, and push rod A and push rod B push the windshield strip out of the mold cavity to complete a stamping action. By adopting a PLC control system, the stamping work efficiency can be improved, and the stamping quality can be controlled.

[0017] Furthermore, the longitudinal adjustment mounting plate is connected to the bottom plate through a waist-shaped hole A extending along the Y-axis direction. The waist-shaped hole A is used to adjust the displacement of the punching working module in the Y-axis direction, thereby adjusting the front and rear position of the longitudinal adjustment mounting plate on the bottom plate.

[0018] Furthermore, the transverse adjustment mounting plate is connected to the longitudinal adjustment mounting plate through a waist-shaped hole B extending along the X-axis direction. The waist-shaped hole B is used to adjust the displacement of the punching working module in the X-axis direction, thereby adjusting the left and right position of the longitudinal adjustment mounting plate on the bottom plate.

[0019] Furthermore, the height adjustment mounting plate includes a first height adjustment mounting plate and a second height adjustment mounting plate. The first height adjustment mounting plate is fixedly mounted on the lateral adjustment mounting plate, and its upper side surface is set to a first inclined surface inclined along the Y-axis direction. The second height adjustment mounting plate is connected to the first height adjustment mounting plate through a waist-shaped hole C extending along the Y-axis direction, and the lower side surface of the second height adjustment mounting plate is set to a second inclined surface, and the first inclined surface and the second inclined surface are slidably connected.

[0020] The displacement of the first height adjustment mounting plate in the Y-axis direction is adjusted through the waist-shaped hole C, thereby adjusting the front and rear position of the first height adjustment mounting plate on the second height adjustment mounting plate. Since the first height adjustment mounting plate and the second height adjustment mounting plate are connected by an inclined surface, when the first height adjustment mounting plate slides downward along the second height adjustment mounting plate, the total height of the first height adjustment mounting plate and the second height adjustment mounting plate decreases, and vice versa.

[0021] The beneficial effects of the utility model are as follows: the punching die of the present application can be used to process all holes and bosses of the windshield strips at one time, reducing the number of dies used and the time occupied by the punching equipment, and improving the punching work efficiency. In combination with the rolling and stretch bending process, the process route of the windshield strips can be greatly shortened, and no subsequent offline shaping process is required, which greatly improves the production efficiency of the windshield strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional structural diagram of the windshield strip stamping die of this application.

[0023] Figure 2 This is a working schematic diagram of 6 sets of stamping working modules in this application.

[0024] Figure 3 This is a three-dimensional structural diagram of the stamping working module of this application.

[0025] Figure 4 Schematic diagram of the connection between the die of the stamping working module and the windshield strip.

[0026] Figure 5 This is a schematic diagram of the connection between the stamping components of the stamping working module and the windshield strip.

[0027] Figure 6 This is a schematic diagram of the connection between the intermediate push rod assembly and the windshield strip of this application.

[0028] Figure 7 This is a schematic diagram of the connection between the push rod assemblies at both ends of this application and the windshield strips. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and a preferred implementation manner.

[0030] See also Figure 1-Figure 7 This embodiment provides a windshield strip stamping die, including a base plate 2, a middle push rod assembly, two end push rod assemblies and 6 sets of stamping working modules 9.

[0031] Six groups of stamping working modules 9 are arranged in an arc shape on the bottom plate 2 in both the X direction and the Z direction, and a push rod movable gap is provided between two adjacent groups of stamping working modules;

[0032] The intermediate push rod assembly includes a push rod connecting plate 3, 5 push rods A4 and a push rod cylinder A5; the push rod cylinder A5 is installed on the rear side of the stamping working module 9, and the cylinder piston rod extends forward to connect the push rod connecting plate 3. In this embodiment, the push rod connecting plate 3 is arranged in an arc shape on the bottom plate, and one end of the 5 push rods A is fixed on the arc-shaped push rod connecting plate 3, and the other end extends to the 5 gaps of the 6 groups of stamping working modules respectively; the push rod A is in the shape of a round rod, and its front end is provided with two cutting surfaces, through which the bottom of the wind window strip groove can be inserted to push the wind window strip out of the mold.

[0033] The push rod assemblies at both ends have the same structure, including a push rod cylinder B7, a push rod seat B8 and two small push rods B8-1. The two push rod cylinders B8 are respectively installed on both sides of the 6 groups of stamping working modules. The cylinder piston rod extends forward to connect the push rod seat B8. One end of the push rod seat B8 is rotatably installed on the bottom plate 2 through the rotating shaft 8-2, and the two small push rods B8-1 are fixedly installed on the push rod seat B8. The push rod cylinder B7 is pushed out, driving the push rod seat B8 to rotate around the rotating shaft 8-2, and the front ends of the two small push rods B8-1 are inserted into the bottom of the wind window strip groove to push the wind window strip out of the mold.

[0034] The bottom plate 2 is a rectangular flat plate, and bolt holes are arranged around it for fixing the bottom plate on the workbench. Six sets of stamping working modules 9, an intermediate push rod assembly, two end push rod assemblies and an oil pipe seat 6 are arranged on the bottom plate 2. The oil pipe seat 6 is used to connect the oil inlet and outlet pipes of the oil cylinders of the six sets of stamping working modules 9, and the connection between the stamping working modules 9 and the hydraulic device is convenient through the oil pipe seat.

[0035] The six groups of stamping working modules 9 have the same structure, and each group of stamping working modules includes a cylinder 10, a pressing block 11, a punch fixing plate 24, a longitudinal adjustment mounting plate 12, a transverse adjustment mounting plate 13, a height adjustment mounting plate, a lower die frame 16, three boss punches 17, a hole punch 18, three boss dies 20 and a hole die 21.

[0036] Four waist-shaped holes A extending along the Y-axis direction are arranged at the front and rear ends of the longitudinal adjustment mounting plate 12. The longitudinal adjustment mounting plate 12 is fixed to the base plate 2 by screws passing through the waist-shaped holes A. By adjusting the relative position of the waist-shaped holes A and the screws, the longitudinal adjustment mounting plate 12 can be adjusted to move along the Y-axis direction, thereby adjusting the front and rear position of the longitudinal adjustment mounting plate 12 on the base plate.

[0037] Four waist-shaped holes B extending along the X-axis direction are arranged at the front and rear ends of the transverse adjustment mounting plate 13. The transverse adjustment mounting plate 13 is fixed to the longitudinal adjustment mounting plate 12 by screws passing through the waist-shaped holes B. By adjusting the relative position of the waist-shaped holes B and the screws, the transverse adjustment mounting plate 13 can be adjusted to move along the X-axis direction, thereby adjusting the left and right position of the transverse adjustment mounting plate 13 on the longitudinal adjustment mounting plate 12.

[0038] The height adjustment mounting plate includes a first height adjustment mounting plate 14 and a second height adjustment mounting plate 15. The lower side of the first height adjustment mounting plate 14 is a horizontal plane, and the upper side is set as a first inclined plane inclined along the Y-axis direction; the upper side of the second height adjustment mounting plate 15 is a horizontal plane, and the lower side is set as a first inclined plane inclined along the Y-axis direction; the first inclined plane and the second inclined plane are slidably connected. The first height adjustment mounting plate 14 is fixedly mounted on the lateral adjustment mounting plate 13 by screws, and the front and rear ends of the second height adjustment mounting plate 15 are both provided with waist-shaped holes C extending along the Y-axis direction, and the second height adjustment mounting plate 15 is connected to the first height adjustment mounting plate 14 by screws passing through the waist-shaped holes C. By adjusting the relative position of the waist-shaped holes C and the screws, the second height adjustment mounting plate 15 can be adjusted to move along the Y-axis direction, thereby adjusting the left and right position of the second height adjustment mounting plate 15 on the first height adjustment mounting plate 14, and then adjusting the total height of the first height adjustment mounting plate and the second height adjustment mounting plate.

[0039] Six groups of stamping working modules 9 are installed on the base plate 2 through the longitudinal adjustment mounting plate 12, the transverse adjustment mounting plate 13 and the height adjustment mounting plate. Through the cooperation of the longitudinal adjustment mounting plate 12 and the transverse adjustment mounting plate 13, the six groups of stamping working modules 9 can be arranged in an arc shape in the X direction on the base plate 2; through the cooperation of the first height adjustment mounting plate 14 and the second height adjustment mounting plate 15, the six groups of stamping working modules 9 can be arranged in an arc shape in the Z direction on the base plate 2.

[0040] The oil cylinder 10 is mounted on the height adjustment mounting plate through the oil cylinder bracket, the oil cylinder piston rod extends vertically downward to connect the pressing block 11, the pressing plate 25 and the punch fixing plate 24 are connected in sequence by bolts to form an upper die seat, the upper die seat is slidably mounted on the second height adjustment mounting plate 15 through the square guide column 26 and the guide frame 28, the guide frame 28 is fixed on the upper side of the second height adjustment mounting plate 15, the square guide column 26 and the return spring 27 are installed in the guide frame 28, the square guide column 26 is slidably matched with the guide frame 28, and its upper end is fixedly connected to the rear side of the punch fixing plate 24. When the pressing block 11 is pressed down, it first contacts the pressing plate 25, and the pressing plate 25 evenly distributes the punching force to the punch fixing plate 24; the return spring 27 is used to restore the upper die seat to the initial position after the punching action is completed, and then perform the next punching action.

[0041] The front bottom of the punch fixing plate 24 is fixedly connected with three boss punches 17, a hole punch 18 and two side baffles 19. The lower end of the boss punch 17, the hole punch 18 and the side baffles 19 extends from the pressing plate 23. The side baffles 19 are used to press the windshield strip from the side when the oil cylinder moves downward. The pressing plate 23 is used to press the stamping surface of the windshield strip 1 against the three boss dies 20 and the hole die 21 when the oil cylinder moves downward. The boss punch 17 and the hole punch 18 form a stamping assembly, which cooperates with the boss die 20 and the hole die 21 respectively. The hole punch 18 can be a round hole punch or a waist hole punch. The fixed positions of the three boss punches 17 and the hole punch 18, as well as the shape of the hole punch are designed according to the adaptability of the windshield strip structure.

[0042] The lower mold frame 16 is installed on the first height adjustment mounting plate 14, and three boss dies 20 and one hole die 21 are fixedly installed in the lower mold frame 16. The three boss dies 20 cooperate with three boss punches 17 to punch to form bosses, and the hole die 21 cooperates with the hole punch 18 to punch to form holes.

[0043] In order to further improve the working efficiency and stamping quality of stamping, a cylinder sensor 22 is also provided on the cylinder 10, and the stamping mold also includes a PLC controller. The push rod cylinder A5, the push rod cylinder B7 and the cylinder sensor 22 are all connected to the PLC controller. The PLC controller is used to control the cylinder 10 to move downward to the sensing position, the cylinder rises, and then the push rod cylinder A5 and the push rod cylinder B7 automatically act at the same time, and the push rod A4 and the push rod B8-1 push the windshield strip out of the mold cavity to complete a stamping action.

[0044] The working principle of the utility model is:

[0045] (1) First, adjust the curvature of the mold in the X-axis direction by longitudinally adjusting the mounting plate 12 and transversely adjusting the mounting plate 13;

[0046] (2) Then, the curvature of the mold in the Z-axis direction is adjusted by the first height adjustment mounting plate 14 and the second height adjustment mounting plate 15;

[0047] (3) Placing the windshield strip 1 on the lower die frame 16 of the six sets of stamping working modules 9;

[0048] (4) The oil cylinder 10 starts to provide punching force, which is transmitted to the punching assembly fixed on the punch fixing plate 24 through the pressing block 11. The side stopper 19 moves downward and presses the side surface of the windshield strip 1. The pressing plate 23 moves downward to press the punching surface of the windshield strip against the die. Then, the hole punch 18 and the boss punch 17 move downward to cooperate with the boss die and the hole die to punch the windshield strip 1, respectively, so that all holes and bosses of the windshield strips are processed at one time.

[0049] (5) When the cylinder 10 moves downward to the set position, the sensor 22 gives a signal, and the PLC controls the cylinder 10 to lift up, and then controls the push rod cylinder A5 and the push rod cylinder B7 to move at the same time. The push rod A4 and the push rod B8-1 push the part out of the mold cavity, completing a stamping action.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications are also within the protection scope of the present invention.

Claims

1. A windshield strip stamping die, characterized in that: It comprises a bottom plate (2), a middle push rod assembly, two end push rod assemblies and 6 sets of stamping working modules (9). The six groups of stamping working modules (9) are arranged in an arc shape on the bottom plate (2) in both the X direction and the Z direction, and a push rod movable gap is provided between two adjacent groups of stamping working modules; The intermediate push rod assembly comprises a push rod connecting plate (3), five push rods A (4) and a push rod cylinder A (5); the push rod cylinder A (5) is mounted on the rear side of the stamping working module (9), the cylinder piston rod extends forward to connect the push rod connecting plate (3), one end of the five push rods A (4) is fixed on the push rod connecting plate (3), and the other end extends to five gaps of the six groups of stamping working modules (9); The push rod assemblies at both ends have the same structure, and both include a push rod cylinder B (7), a push rod seat B (8) and two small push rods B (8-1). The two push rod cylinders B (7) are respectively installed on both sides of the six groups of stamping working modules (9). The cylinder piston rod extends forward to connect to the push rod seat B (8). One end of the push rod seat B (8) is rotatably mounted on the bottom plate (2) through a rotating shaft. The two small push rods B (8-1) are fixedly mounted on the push rod seat B (8). The six sets of stamping working modules (9) are used to stamp out all holes and bosses of the wind window strip at one time, and the middle push rod assembly and the two end push rod assemblies cooperate to remove the stamped wind window strip from the mold.

2. A window strip stamping die according to claim 1, characterized in that: Each set of stamping working modules (9) includes a cylinder (10), a pressing block (11), a punch fixing plate (24), a longitudinal adjustment mounting plate (12), a transverse adjustment mounting plate (13), a height adjustment mounting plate, a lower die frame (16), three boss punches (17), a hole punch (18), three boss dies (20) and a hole die (21); the longitudinal adjustment mounting plate (12) is mounted on the bottom plate (2) for adjusting the Y-axis position of the die, the transverse adjustment mounting plate (13) is mounted on the longitudinal adjustment mounting plate (12) for adjusting the X-axis position of the die, the height adjustment mounting plate is mounted on the transverse adjustment mounting plate (13) for adjusting the Z-axis position of the die, and the cylinder (10) is mounted on the bottom plate (2) through a cylinder bracket. On the height adjustment mounting plate, the oil cylinder piston rod extends vertically downward to connect the pressure block (11), the bottom rear side of the punch fixing plate (24) is connected to the square guide column (26), the square guide column (26) is slidably mounted in the guide frame (28), the guide frame (28) is fixedly mounted on the height adjustment mounting plate, a return spring (27) is provided between the square guide column (26) and the guide frame (28), three boss punches (17) and one hole punch (18) are all fixed on the punch fixing plate (24), the lower die frame (16) is mounted on the height adjustment mounting plate, three boss dies (20) and one hole die (21) are fixedly mounted in the lower die frame (16) and correspond to the three boss punches (17) and the one hole punch (18) respectively.

3. A window strip stamping die according to claim 2, characterized in that: Two side baffles (19) and a press plate (23) are fixedly installed on the front side below the punch fixing plate (24). The lower ends of the side baffles (19), the boss punch (17) and the hole punch (18) all pass through the press plate (23). The side baffles (19) are used to press the windshield strip from the side when the oil cylinder moves downward; the press plate (23) is used to press the stamping surface of the windshield strip against the three boss dies (20) and the one hole die (21) when the oil cylinder moves downward.

4. A window strip stamping die according to claim 2, characterized in that: The oil cylinder (10) is also provided with an oil cylinder sensor (22), and the oil cylinder sensor (22) is used to control the stroke of the oil cylinder (10).

5. A window strip stamping die according to claim 4, characterized in that: The invention also includes a PLC controller. The push rod cylinder A (5), the push rod cylinder B (7) and the oil cylinder sensor (22) are all connected to the PLC controller. The PLC controller is used to control the oil cylinder (10) to move downward to the sensing position, and then the oil cylinder rises. Then, the push rod cylinder A (5) and the push rod cylinder B (7) act simultaneously, and the push rod A (4) and the push rod B (8-1) push the windshield strip out of the mold cavity, completing a stamping action.

6. The window strip stamping die according to claim 2, characterized in that: The longitudinal adjustment mounting plate (12) is connected to the bottom plate (2) via a waist-shaped hole A extending along the Y-axis direction.

7. The window strip stamping die according to claim 2, characterized in that: The transverse adjustment mounting plate (13) is connected to the longitudinal adjustment mounting plate (12) via a waist-shaped hole B extending along the X-axis direction.

8. The window strip stamping die according to claim 2, characterized in that: The height adjustment mounting plate comprises a first height adjustment mounting plate (14) and a second height adjustment mounting plate (15); the first height adjustment mounting plate (14) is fixedly mounted on the transverse adjustment mounting plate (13); the upper side surface of the first height adjustment mounting plate (14) is arranged as a first inclined surface inclined along the Y-axis direction; the second height adjustment mounting plate (15) is connected to the first height adjustment mounting plate (14) via a waist-shaped hole C extending along the Y-axis direction; the lower side surface of the second height adjustment mounting plate (15) is arranged as a second inclined surface; and the first inclined surface and the second inclined surface are slidably connected.

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