A heat disc machine tooling fixture

Abstract

The utility model relates to a kind of heating disc machining clamps, comprising: mounting seat, clamping component and extruding block;The upper surface of the mounting seat is provided with at least three dovetail grooves, and upper is provided with the clamping component extending to the inside of dovetail groove, the clamping component includes at least three clamping plates, three the clamping plate is provided with extruding block, the extruding block is used to push clamping component along the direction of the dovetail groove moves.The utility model is by being provided with mounting seat, clamping component, extruding block and reset spring etc., by the cooperation between extruding block, mounting seat and clamping component, so that clamping component can be pushed along the direction of the dovetail groove by extruding block, i.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, specifically to a fixture for machining heating plates. Background Technology

[0002] Cast iron heating plates are common components in various heating devices. They are made of cast iron and generate heat by passing an electric current through a built-in heating wire. Cast iron heating plates are commonly found inside appliances that require heating, such as rice cookers and coffee machines. Cast iron heating plates are usually made by melting metal raw materials and pouring them into a mold. After cooling, they are demolded to obtain a semi-finished product. The semi-finished product is then processed by turning, milling, and other methods to remove excess cast iron. The heating plate in a rice cooker has a hole in the center.

[0003] During the processing of the semi-finished product, the cast iron heating plate (hereinafter referred to as the heating plate) needs to be clamped by a fixture. The common clamping method is to fix it with flat-jaw pliers or pressure plate bolts. Flat-jaw pliers have limited clamping force, and because the contact area between the jaws and the heating plate is small, local stress concentration is likely to occur, which will cause the heating plate to deform. At the same time, during clamping, the tooling position needs to be repeatedly adjusted to be aligned (such as to its machining datum), which is cumbersome. When clamping the workpiece, the positions of the T-bolts, pressure plates, and shims need to be adjusted one by one to ensure that the pressure plates evenly clamp the workpiece. The alignment process is time-consuming. Furthermore, since there is a mounting post on one side of the heating plate, uneven clamping force is likely to occur on the surface of the heating plate when milling the surface of the side without the mounting post. This not only causes the heating plate to easily shift during processing, affecting the processing accuracy, but may also cause the heating plate to deform due to excessive local stress. This effect is more pronounced for thin-walled or easily deformable heating plates. Therefore, a heating plate machining fixture is proposed to solve the above-mentioned problems. Utility Model Content

[0004] Based on the above description, this utility model provides a heating plate machining fixture to solve the problems of inconvenient alignment and uneven clamping force when clamping heating plates using common clamping methods such as pressure plate bolts and flat-jaw pliers.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A heating plate machining fixture, comprising: a mounting base, a clamping assembly and an extrusion block; The upper surface of the mounting base is provided with at least three dovetail grooves, and a clamping assembly extending into the dovetail grooves is provided above it. The clamping assembly includes at least three clamping plates, and a pressing block is provided between the three clamping plates. The pressing block is used to push the clamping assembly to move along the direction of the dovetail grooves.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the mounting base includes a base body, the lower surface of which is provided with a main dovetail block, and the upper surface of which is provided with a main threaded hole. The main threaded hole penetrates the main dovetail block and is provided with a fixing screw inside. The fixing screw extends to the bottom of the main threaded hole and is threadedly connected to the main threaded hole.

[0008] Furthermore, the upper surface of the base is provided with positioning blind holes, which are staggered with the main threaded holes, for placing the mounting post on one side of the heating plate.

[0009] Furthermore, a mounting groove is provided at the center of the upper surface of the base, and a central seat is provided on the bottom wall inside the mounting groove. A gap is provided between the circumferential surface of the central seat and the inner sidewall of the mounting groove.

[0010] Furthermore, the upper surface of the center seat is provided with at least three dovetail grooves along the axial direction, and a secondary threaded hole is provided at the center of the circle, wherein the secondary threaded hole and the dovetail grooves are not connected.

[0011] Furthermore, a limiting cover is fitted around the center seat. The limiting cover includes a hollow cylinder disposed in the gap. A cover plate is provided on the top of the hollow cylinder. A central hole is provided on the top of the cover plate. The cover plate is disposed above the dovetail groove to cover a portion of the dovetail groove.

[0012] Furthermore, the three clamping plates are arranged in a ring at equal intervals and located inside the central hole. The lower surface of the clamping plates is provided with a secondary dovetail block extending into the dovetail groove. The length of the secondary dovetail block is less than the width of the gap, so as to ensure that the secondary dovetail block can extend into the gap and be pushed into the dovetail groove.

[0013] Furthermore, a return spring is provided inside the dovetail groove. One end of the return spring is in close contact with one side of the secondary dovetail block, and the other end is in close contact with the inner wall of the hollow cylinder. Each of the three secondary dovetail blocks has an inverted frustum extrusion surface on one opposite side.

[0014] Furthermore, the extrusion block includes a frustum block disposed between the three secondary dovetail blocks. The frustum block has the same shape as the frustum extrusion surface and fits into each other. The center of the upper surface of the frustum block is provided with an internal hexagon blind hole, and the lower surface is provided with a threaded post. The threaded post is threadedly connected to the secondary threaded hole.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This utility model, by setting up a mounting base, a clamping component, a pressing block, and a return spring, etc., through the cooperation between the pressing block, the mounting base, and the clamping component, enables the clamping component to move along the direction of the dovetail groove under the push of the pressing block, that is, to move in a direction away from each other, thereby enabling the clamping component to clamp the inner wall of the heating plate hole. When the pressing block moves in the opposite direction, the clamping component is reset under the action of the return spring. 2. By setting the mounting base and the limiting cover, the clamping component is limited, which not only restricts the movement of the clamping component but also prevents the return spring from disengaging and effectively reduces the chance of debris entering the dovetail groove during processing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a heating plate machining fixture provided in an embodiment of the present utility model; Figure 2 This is a cross-sectional view of the fixture in an embodiment of the present invention; Figure 3 This is a schematic diagram of the mounting base in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the limiting cover in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the fixture assembly in an embodiment of the present invention; Figure 6 for Figure 5 Another structural diagram from a different perspective; Figure 7 This is a schematic diagram of the extrusion block in an embodiment of the present invention; Figure 8 This is a schematic diagram showing the usage state of the clamp in an embodiment of this utility model; Figure 9 This is a schematic diagram of the structure of a heating plate in the prior art; The attached diagram lists the components represented by each number as follows: 1. Mounting base; 11. Base body; 12. Main dovetail block; 13. Main threaded hole; 14. Positioning blind hole; 15. Mounting groove; 16. Center seat; 17. Dovetail groove; 18. Secondary threaded hole; 2. Limiting cover; 21. Hollow cylinder; 22. Cover plate; 23. Center hole; 3. Clamping assembly; 31. Clamping plate; 32. Secondary dovetail block; 33. Frustum extrusion surface; 4. Extrusion block; 41. Frustum block; 42. Internal hexagon blind hole; 43. Threaded post; 5. Return spring; 6. Fixing screw; 7. Heating plate. Detailed Implementation

[0017] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0019] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0020] like Figures 1-3 As shown, a heating plate machining fixture is characterized by comprising: a mounting base 1, a clamping assembly 3, and an extrusion block 4; The upper surface of the mounting base 1 is provided with at least three dovetail grooves 17. The mounting base 1 includes a base body 11. The lower surface of the base body 11 is provided with a main dovetail block 12, and the upper surface is provided with a main threaded hole 13. The main threaded hole 13 passes through the main dovetail block 12 and is provided with a fixing screw 6 inside. The fixing screw 6 extends to the bottom of the main threaded hole 13 and is threadedly connected to the main threaded hole 13. The upper surface of the base 11 is provided with a positioning blind hole 14, which is staggered from the main thread hole 13 and is used to place the mounting post on one side surface of the heating plate 7. A mounting groove 15 is provided at the center of the upper surface of the base 11. A center seat 16 is provided on the bottom wall inside the mounting groove 15. A gap is provided between the circumferential surface of the center seat 16 and the inner side wall of the mounting groove 15. The upper surface of the center seat 16 is provided with at least three dovetail grooves 17 along the axial direction, and a secondary threaded hole 18 is provided at the center. The secondary threaded hole 18 and the dovetail grooves 17 are not connected. Based on the above, the seat 11 provides support for the heating plate 7. The main dovetail block 12, the main threaded hole 13, and the fixing screw 6 cooperate with each other so that the mounting seat 1 can be installed on the milling machine. That is, the main dovetail block 12 is inserted into the inside of the dovetail groove on the surface of the milling machine worktable from the side. By tightening the fixing screw 6, it passes through the main screw hole 13 and fits tightly against the inner wall of the dovetail groove on the surface of the milling machine worktable, thereby achieving the effect of fixing the mounting seat 1 on the milling machine worktable. The positioning blind hole 14 serves to place the mounting post on the surface of the heating plate 7, avoiding uneven force when the mounting post of the heating plate 7 is oriented. The center seat 16 and the dovetail groove 17 allow the clamping component 3 to be inserted into the dovetail groove 17 through the gap, thereby realizing the installation of the clamping component 3. Furthermore, the secondary threaded hole 18 allows the extrusion block 4 to be threadedly connected to it, and the vertical movement of the extrusion block 4 can be achieved by twisting it.

[0021] like Figure 1 , Figure 2 and Figure 4 As shown, a limiting cover 2 is sleeved on the outside of the center seat 16. The limiting cover 2 includes a hollow cylinder 21 disposed in the gap. A cover plate 22 is disposed on the top of the hollow cylinder 21. A central hole 23 is disposed on the top of the cover plate 22. The cover plate 22 is disposed above the dovetail groove 17 to cover part of the dovetail groove 17. Based on the above, the setting of the limiting cover 2 serves to block part of the dovetail groove 17, thereby limiting the movement path of the clamping component 3, preventing the clamping component 3 from moving excessively, and also providing a certain degree of protection for the return spring 5.

[0022] like Figure 1 , Figure 2 , Figure 5 as well as Figure 6 As shown, a clamping assembly 3 extending into the dovetail groove 17 is provided above the mounting base 1, and the clamping assembly 3 includes at least three clamping plates 31. The three clamping plates 31 are arranged in a ring at equal intervals and are located inside the central hole 23. The lower surface of the clamping plate 31 is provided with a secondary dovetail block 32 extending into the dovetail groove 17. The length of the secondary dovetail block 32 is less than the width of the gap, so as to ensure that the secondary dovetail block 32 can extend into the gap and push into the dovetail groove 17. A return spring 5 is provided inside the dovetail groove 17. One end of the return spring 5 is tightly attached to one side of the secondary dovetail block 32, and the other end is tightly attached to the inner wall of the hollow cylinder 21. Each of the three secondary dovetail blocks 32 has an inverted frustum extrusion surface 33 on one side of its opposite side. Based on the above, the clamping plate 31 is connected to the dovetail groove 17 through the secondary dovetail block 32. At this time, the secondary dovetail block 32 can only drive the clamping plate 31 to move along the direction of the dovetail groove 17. When the three clamping plates 31 move away from each other, the reset spring 5 is compressed and generates a reverse elastic force. The setting of the inverted frustum extrusion surface 33 allows the clamping assembly 3 to cooperate with the extrusion block 4. Under the extrusion of the extrusion block 4, the three clamping plates 31 move away from each other.

[0023] like Figure 1 , Figure 2 as well as Figure 7 As shown, a pressing block 4 is provided between the three clamping plates 31, and the pressing block 4 is used to push the clamping assembly 3 to move along the direction of the dovetail groove 17; The extrusion block 4 includes a frustum block 41 disposed between the three secondary dovetail blocks 32. The frustum block 41 has the same shape as the frustum extrusion surface 33 and fits together. The center of the upper surface of the frustum block 41 is provided with an internal hexagon blind hole 42, and the lower surface is provided with a threaded post 43. The threaded post 43 is threadedly connected to the secondary threaded hole 18. Based on the above, the setting of the extrusion block 4 serves to push the three clamping plates 31 to move away from each other. The setting of the internal hexagon blind hole 42 allows the extrusion block 4 to be tightened or loosened by a hexagonal wrench. Furthermore, the threaded post 43 and the secondary threaded hole 18 cooperate with each other, allowing the extrusion block 4 to be connected to the mounting base 1 by means of screw connection. When the extrusion block 4 is tightened, it moves downward. During this process, the outer surface of the inverted frustum block 41 and the inverted frustum extrusion surface 33 press against each other, causing the three clamping plates 31 to move away from each other under the extrusion force. When the extrusion block 4 moves in the opposite direction, it moves upward, thereby causing the outer surface of the inverted frustum block 41 to separate from the inverted frustum extrusion surface 33.

[0024] In summary, this fixture uses three clamping plates 31 working together to clamp the heating plate 7 of the rice cooker using an internal expansion clamping method. Compared with the flat-jaw pliers and the pressure plate bolt fixing method, the uniformity of clamping force is improved by more than 60%, the workpiece displacement is controlled within ±0.02mm during processing, and the plastic deformation rate is reduced to below 0.05%. Although the internal expansion fixing method is only applicable to heating plates 7 with holes at the center, it is not only highly efficient when clamping and fixing such heating plates 7, but also applicable to the processing of different surfaces of such heating plates 7. Moreover, the clamping stability is significantly improved compared to the flat-jaw pliers and pressure plate bolt fixing methods.

[0025] The specific usage process of this fixture is as follows: Fixture installation: Slide the main dovetail block 12 of the mounting base 1 into the dovetail groove of the machine tool worktable, tighten the fixing screw 6 to lock it with the worktable, and complete the fixing of the fixture to the machine tool. Workpiece positioning: The center hole of the heating plate 7 is fitted onto the outside of the clamping assembly 3, so that the mounting post on the surface of the heating plate is inserted into the positioning blind hole 14 of the base body to achieve preliminary positioning; Clamping operation: Rotate the extrusion block 4 clockwise using an Allen wrench (the direction of rotation of the extrusion block 4 is determined according to the direction of the internal thread of the secondary threaded hole 18; the above is just an example of clockwise rotation). The threaded column 43 feeds downward along the secondary threaded hole 18 (feeding speed 0.5mm / r). The truncated cone block 41 extrudes the truncated cone extrusion surface 33 of the clamping assembly 3 through the conical extrusion surface, causing the three clamping plates 31 to expand radially synchronously along the dovetail groove 17 (the expansion speed is positively correlated with the extrusion block feed amount; for example, a 1mm feed corresponds to a 0.8mm expansion), until the outer arc surface of the clamping plate 31 is tightly fitted with the inner wall of the hole of the heating plate 7 (clamping force can reach 800-1200N), thus completing the clamping. Processing procedure: Start the machine tool to perform turning, milling and other machining operations. The limit cover 2 blocks most of the debris to prevent it from entering the dovetail groove 17. Release the workpiece: After processing, rotate the extrusion block 4 counterclockwise to reset it upwards. The reset spring 5 drives the clamping assembly 3 to retract radially and separate it from the inner wall of the heating plate 7 hole. Then, remove the heating plate.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A machining fixture for a heating plate, characterized in that, include: Mounting base (1), clamping assembly (3) and pressing block (4); The upper surface of the mounting base (1) is provided with at least three dovetail grooves (17), and a clamping assembly (3) extending into the dovetail grooves (17) is provided above it. The clamping assembly (3) includes at least three clamping plates (31), and a pressing block (4) is provided between the three clamping plates (31). The pressing block (4) is used to push the clamping assembly (3) to move along the direction of the dovetail grooves (17).

2. The heating plate machining fixture according to claim 1, characterized in that, The mounting base (1) includes a base body (11), a main dovetail block (12) is provided on the lower surface of the base body (11), and a main threaded hole (13) is provided on the upper surface. The main threaded hole (13) passes through the main dovetail block (12) and is provided with a fixing screw (6) inside. The fixing screw (6) extends to the bottom of the main threaded hole (13) and is threadedly connected to the main threaded hole (13).

3. The heating plate machining fixture according to claim 2, characterized in that, The upper surface of the base (11) is provided with a positioning blind hole (14), which is staggered from the main thread hole (13) and is used to place the mounting post on one side of the heating plate (7).

4. The heating plate machining fixture according to claim 3, characterized in that, An installation groove (15) is provided at the center of the upper surface of the seat (11), and a center seat (16) is provided on the bottom wall inside the installation groove (15). A gap is provided between the circumferential surface of the center seat (16) and the inner side wall of the installation groove (15).

5. The heating plate machining fixture according to claim 4, characterized in that, The upper surface of the center seat (16) is provided with at least three dovetail grooves (17) along the axial direction, and a secondary threaded hole (18) is provided at the center. The secondary threaded hole (18) and the dovetail grooves (17) are not connected.

6. The heating plate machining fixture according to claim 5, characterized in that, The center seat (16) is fitted with a limiting cover (2). The limiting cover (2) includes a hollow cylinder (21) disposed in the gap. The top of the hollow cylinder (21) is provided with a cover plate (22). The top of the cover plate (22) is provided with a central hole (23). The cover plate (22) is disposed above the dovetail groove (17) to cover part of the dovetail groove (17).

7. The heating plate machining fixture according to claim 6, characterized in that, The three clamping plates (31) are distributed in a ring at equal intervals and are located inside the central hole (23). The lower surface of the clamping plate (31) is provided with a secondary dovetail block (32) extending into the dovetail groove (17). The length of the secondary dovetail block (32) is less than the width of the gap, so as to ensure that the secondary dovetail block (32) can extend into the gap and push into the dovetail groove (17).

8. The heating plate machining fixture according to claim 7, characterized in that, The dovetail groove (17) is provided with a return spring (5). One end of the return spring (5) is tightly attached to one side of the secondary dovetail block (32), and the other end is tightly attached to the inner wall of the hollow cylinder (21). The three secondary dovetail blocks (32) are provided with a frustum extrusion surface (33) on opposite sides.

9. The heating plate machining fixture according to claim 8, characterized in that, The extrusion block (4) includes an inverted frustum block (41) disposed between the three secondary dovetail blocks (32). The inverted frustum block (41) has the same shape as the inverted frustum extrusion surface (33) and fits together. An internal hexagon blind hole (42) is provided at the center of the upper surface of the inverted frustum block (41), and a threaded post (43) is provided on the lower surface. The threaded post (43) is threadedly connected to the secondary threaded hole (18).

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