Heat shield positioning tool

Abstract

The utility model provides a heat shield positioning tool which comprises a base, and a sliding block, a workpiece placing area, a fixing block and a piston cylinder are arranged on the base. A first profiling clamp is arranged at the top of the sliding block, and a first clamping opening is formed in one side of the first profiling clamp; a second profiling clamp is arranged at the top of the fixed block; a second clamping opening is formed in one side of the second profiling clamp; the first clamping opening is opposite to the second clamping opening; the free end of a piston of the piston cylinder is connected with the side, away from the workpiece containing area, of the sliding block. The piston movement direction of the piston cylinder is consistent with the sliding direction of the sliding block. A first clamping block is arranged on the first clamping opening, and a second clamping block and a third clamping block are arranged on the second clamping opening; a groove is further formed in the second clamping opening. The utility model solves the technical problems in the prior art that the centering degree is deviated due to interference or clearance fit between the clamp and the heat shield, the clamp and the heat shield are extruded during processing to cause wrinkling deformation, and the position deviation is larger when the heat shield is put in.

Description

Heat insulation cover positioning fixture Technical Field

[0001] This utility model relates to the field of machinery, and further to metal processing equipment, especially to workpiece clamping devices, and particularly to a heat insulation cover positioning fixture. Background Technology

[0002] A heat shield is a thin-walled part with an opening on one side. The lower half is a thin-walled cylinder, and the upper half is a thin-walled arc-shaped cover. The existing processing steps are as follows: after clamping and positioning the thin-walled cylinder of the heat shield with two semi-circular clamps, multiple holes perpendicular to the horizontal plane are drilled on the arc-shaped cover to meet the assembly requirements.

[0003] However, the following defects were discovered during the processing:

[0004] 1. To ensure the accuracy of the assembly position of the holes, the centering requirement after the heat shield is clamped is high. The existing fixture uses two semi-circular fixtures to clamp the thin-walled cylindrical body with hoops on the outer periphery. Since the diameter of the thin-walled cylindrical body of the heat shield itself has a certain tolerance, interference or clearance fit will occur between the fixture and the thin-walled cylindrical body, thus affecting the centering positioning.

[0005] 2. When there is an interference fit, the fixture will squeeze the thin-walled cylindrical body, causing wrinkles and deformation; when the drill bit is drilling, the heat shield as a whole is subjected to downward extrusion force, which will also produce wrinkles or indentations on the thin-walled cylindrical body, thus causing processing defects.

[0006] 3. When placing an unprocessed heat shield on the fixture, errors may cause a large deviation in the placement of the heat shield, which may result in the heat shield not being able to enter the semi-circular fixture accurately. When the fixture is closed, the heat shield is squeezed flat by the fixture, increasing the probability of scrap. Summary of the Invention

[0007] The purpose of this utility model is to provide a heat insulation cover positioning fixture, which solves the technical problems in the prior art, such as misalignment caused by interference or clearance fit between the fixture and the heat insulation cover, wrinkling and deformation caused by squeezing of the fixture and the heat insulation cover during processing, and large positional deviation when the heat insulation cover is placed.

[0008] A heat insulation cover positioning fixture includes a base, on which a sliding block, a workpiece placement area, a fixing block, and a piston cylinder are disposed. The workpiece placement area is located between the sliding block and the fixing block. The bottom of the sliding block is slidably connected to the base via a slide rail, and the top of the sliding block is provided with a first contour clamp, one side of which is a first clamping opening. The bottom of the fixing block is fixedly connected to the base, and the top of the fixing block is provided with a second contour clamp, one side of which is a second clamping opening. The first clamping opening and the second clamping opening are opposite to each other. The free end of the piston of the piston cylinder is connected to the side of the sliding block away from the workpiece placement area, and the piston movement direction of the piston cylinder is consistent with the sliding direction of the sliding block. A first clamping block is disposed on the first clamping opening, and a second clamping block and a third clamping block are disposed on the second clamping opening. The first clamping block, the second clamping block, and the third clamping block are evenly arranged around the outer periphery of the workpiece placement area. A groove is also formed on the second clamping opening, and the groove is located between the second clamping block and the third clamping block.

[0009] Furthermore, a positioning disk is provided on the base, and the positioning disk is located within the workpiece placement area.

[0010] Furthermore, the top edge of the positioning disk is chamfered.

[0011] Furthermore, the first contouring clamp is detachably connected to the sliding block; the second contouring clamp is detachably connected to the fixing block.

[0012] Furthermore, the piston cylinder is either a pneumatic cylinder or an electric cylinder.

[0013] Compared with existing technologies, the advantages of this invention are positive and obvious:

[0014] 1. This utility model achieves centering by uniformly clamping the heat insulation cover from three directions using a first clamping block, a second clamping block, and a third clamping block, thus avoiding centering deviation caused by interference or clearance between the heat insulation cover and the clamp.

[0015] 2. The first clamping block and the second clamping block, and the first clamping block and the third clamping block of this utility model are separated from each other. A groove is provided between the second clamping block and the third clamping block, so that when the heat insulation cover is subjected to the extrusion force of the drill bit drilling downward, there is a certain elastic deformation margin, releasing the extrusion force and avoiding plastic deformation such as wrinkles or indentations in the heat insulation cover.

[0016] 3. The positioning plate of this utility model is slightly smaller than the diameter of the heat insulation cover. The bottom opening of the heat insulation cover is fitted onto the positioning plate to achieve coarse positioning when placing the heat insulation cover, so as to avoid large deviations in the placement position of the heat insulation cover. Attached Figure Description

[0017] Figure 1. Schematic diagram of the structure of an embodiment of this utility model.

[0018] Figure 2. Top view of the structure of an embodiment of this utility model.

[0019] Figure 3. Schematic diagram of the connection between the embodiment and the heat insulation cover in this utility model.

[0020] In the figure: 1. Base; 101. Workpiece placement area; 2. Piston cylinder; 3. Sliding block; 4. Fixing block; 5. First contour clamp; 501. First clamping block; 6. Second contour clamp; 601. Second clamping block; 602. Third clamping block; 603. Groove; 7. Heat insulation cover workpiece; 701. Machining hole; 8. Positioning plate. Detailed Implementation

[0021] The following embodiments will further illustrate the present invention, but are not intended to limit the present invention.

[0022] As shown in Figures 1 to 3, this embodiment provides a heat insulation cover positioning fixture, including a base 1, on which a sliding block 3, a fixing block 4, and a piston cylinder 2 are mounted. The area between the sliding block 3 and the fixing block 4 is the workpiece placement area 101, used to place the heat insulation cover workpiece 7. In the front view, from left to right, the base 1 consists of the piston cylinder 2, the sliding block 3, the workpiece placement area 101, and the fixing block 4.

[0023] The bottom of the sliding block 3 is connected to the base 1 via a slide rail. The top of the sliding block 3 is provided with a first contouring clamp 5, and one side of the first contouring clamp 5 is a first clamping opening. The bottom of the fixed block 4 is fixedly connected to the base 1. The top of the fixed block 4 is provided with a second contouring clamp 6. One side of the second contouring clamp 6 is a second clamping opening. The first clamping opening and the second clamping opening are opposite to each other, so as to clamp the two sides of the heat insulation cover workpiece 7 respectively.

[0024] The free end of the piston rod of piston cylinder 2 is fixedly connected to the side of sliding block 3 away from the workpiece placement area 101. The piston movement direction of piston cylinder 2 is consistent with the sliding direction of sliding block 3. When the piston extends, it moves sliding block 3 to the right; when the piston retracts, it moves sliding block 3 to the left. In this embodiment, piston cylinder 2 is a pneumatic cylinder; in other embodiments, an electric cylinder can be used instead. Piston cylinder 2 is controlled by an external set of two-hand buttons. The technical solution of controlling a pneumatic cylinder with two-hand buttons is a commonly used existing technical solution, which will not be elaborated here.

[0025] A first clamping block 501 is fixed on the first clamping port, and a second clamping block 601 and a third clamping block 602 are fixed on the second clamping port. The first clamping block 501, the second clamping block 601, and the third clamping block 602 are evenly arranged around the outer periphery of the workpiece placement area 101. The contact surfaces of the first clamping block 501, the second clamping block 601, and the third clamping block 602 with the heat insulation cover workpiece 7 are arc surfaces. The arc length of the arc contact surfaces of the first clamping block 501, the second clamping block 601, and the third clamping block 602 is one-eighth of the circumference of an imaginary circle. The diameter of the imaginary circle matches the diameter of the heat insulation cover workpiece 7, thereby achieving the effect of evenly clamping the workpiece 7 at three points around it. Because the first clamping block 501 is actively clamped by the sliding table after translation, while the second clamping block 601 and the third clamping block 602 are passively clamped by connection with the fixed base, the first clamping block 501 moves and comes into close contact with one side of the heat insulation cover workpiece 7 during clamping, and pushes the heat insulation cover workpiece 7 to come into close contact with the second clamping block 601 and the third clamping block 602. The gaps or allowances caused by tolerances are eliminated by the three-point centering method, so that workpieces of different diameters can be centered, thereby improving the machining accuracy.

[0026] A groove 603 is also provided on the second clamping opening between the second clamping block 601 and the third clamping block 602. The groove 603 is used to provide a certain elastic deformation margin when the heat shield is subjected to the extrusion force of the drill bit drilling downward, thereby releasing the extrusion force and avoiding plastic deformation such as wrinkles or indentations of the heat shield.

[0027] A circular positioning disk 8 is fixed on the base 1, and the positioning disk 8 is located within the workpiece placement area 101. The diameter of the positioning disk 8 is slightly smaller than the diameter of the inner ring at the bottom of the heat insulation cover, which is used to achieve coarse positioning when placing the heat insulation cover and to avoid large deviations in the placement position of the heat insulation cover workpiece 7. The top edge of the positioning disk 8 is chamfered, making it easier to insert the heat insulation cover workpiece 7.

[0028] The first contour clamp 5 and the sliding block 3 are detachably connected by screws; the second contour clamp 6 is detachably connected to the fixing block 4 by screws. By replacing the first contour clamp 5 and the second contour clamp 6 of different sizes, different sizes of heat insulation cover workpieces 7 can be adapted, thus improving the versatility of the tooling.

[0029] How to use this embodiment:

[0030] 1. Press the two buttons to drive the cylinder to retract the piston rod. The piston rod drives the sliding block 3 to move to the left, thereby opening the clamp.

[0031] 2. Place the heat insulation cover workpiece 7 with the opening facing down into the workpiece placement area 101, and then place it on the positioning plate 8 to achieve coarse positioning.

[0032] 3. Press the two buttons again to drive the cylinder to extend the piston rod. The piston rod drives the sliding block 3 to move to the right, which in turn drives the first clamping block 501 to move. After the first clamping block 501 moves, it comes into close contact with the left side of the heat insulation cover workpiece 7, and pushes the right side of the heat insulation cover workpiece 7 to come into close contact with the second clamping block 601 and the third clamping block 602, thus centering the heat insulation cover workpiece 7 at three points.

[0033] 4. Start the machining program and drill holes in the top arc-shaped cover of the heat insulation cover workpiece 7 using a drill bit. After drilling three machining holes 701, the machining is completed.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A positioning fixture for a heat insulation cover, characterized in that: Includes a base (1), on which a sliding block (3), a workpiece placement area (101), a fixing block (4), and a piston cylinder (2) are provided; the workpiece placement area (101) is located between the sliding block (3) and the fixing block (4); the bottom of the sliding block (3) is slidably connected to the base (1) via a slide rail, and the top of the sliding block (3) is provided with a first contour clamp (5), one side of which is a first clamping opening; the bottom of the fixing block (4) is fixedly connected to the base (1), and the top of the fixing block (4) is provided with a second contour clamp (6); one side of the second contour clamp (6) is a second clamping opening; the first clamping opening and the second clamping opening are arranged opposite to each other; the piston cylinder (2) is... The free end of the piston rod of the piston cylinder (2) is connected to the side of the sliding block (3) away from the workpiece placement area (101). The piston rod of the piston cylinder (2) moves in the same direction as the sliding block (3). A first clamping block (501) is provided on the first clamping port, and a second clamping block (601) and a third clamping block (602) are provided on the second clamping port. The first clamping block (501), the second clamping block (601) and the third clamping block (602) are evenly arranged around the outer periphery of the heat insulation cover workpiece (7). A groove (603) is also provided on the second clamping port. The groove (603) is located between the second clamping block (601) and the third clamping block (602).

2. The heat insulation cover positioning fixture according to claim 1, characterized in that: A positioning disk (8) is provided on the base (1), and the positioning disk (8) is located in the workpiece placement area (101).

3. The heat insulation cover positioning fixture according to claim 2, characterized in that: The top edge of the positioning disk (8) is chamfered.

4. The heat insulation cover positioning fixture according to claim 1, characterized in that: The first contouring clamp (5) is detachably connected to the sliding block (3); the second contouring clamp (6) is detachably connected to the fixing block (4).

5. The heat insulation cover positioning fixture according to claim 1, characterized in that: The piston cylinder (2) is either a pneumatic cylinder or an electric cylinder.

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