Cross ring clamp of scroll compressor with flexible clamping function

Abstract

The application provides a cross ring clamp with flexible clamping function of scroll compressor, and relates to the technical field of machining. The clamp comprises a reference plate, a reference block, a supporting block, a pressing plate, a positioning pin, a limiting bolt, a stop bolt, a pilot pin and a ball head plunger. The stop bolt is threadedly connected to the pressing plate, and the extension length of the stop bolt is adjustable. The pilot pin is installed on the reference plate in a floating manner through a spring, and is used for assisting the elastic support of the bottom of the cross ring workpiece. The ball head plunger is installed on the reference block, and is used for quickly pre-positioning the cross ring workpiece during clamping. The radial positioning is realized through the cooperation of the semi-annular structure of the reference block and the limiting bolt, the axial positioning is realized through the convex end face of the supporting block, and the quick pre-positioning is realized through the ball head plunger. The combined positioning mode makes the cross ring obtain accurate constraints in horizontal and vertical directions during clamping, and effectively solves the problem of inaccurate positioning caused by the wear of the positioning point of the existing hydraulic clamp.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more particularly to a cross-ring clamp for a scroll compressor with flexible clamping function. Background Technology

[0002] Currently, in the milling and drilling processes of the cross ring of a scroll compressor, a two-station hydraulic fixture per side is commonly used. This fixture uses standard hydraulic components, and its structure is as follows: the cross ring is positioned by a fixture reference block, and a hydraulic flipping clamping method is used, with three pressure plates rotating and pressing down to clamp the cross ring onto the fixture. Subsequently, the OS surface of the cross ring is milled, and the positioning holes are drilled. However, the above-mentioned hydraulic fixture has the following technical problems in practical applications:

[0003] 1. Pressure cannot be adjusted independently: This fixture can only adjust the overall pressure of two stations on the same side at the same time, and cannot control the pressure independently for a single station. Due to the different stress states of different stations during the processing, a uniform pressure setting cannot simultaneously meet the optimal clamping requirements of each station, resulting in some stations having flatness deviations after processing (requirement ≤0.01mm). 2. Hard contact can easily damage the workpiece: Both the locating block and the pressure plate adopt a raised locating point design and are made of cemented carbide, forming a hard point contact with the cross ring. This contact method can easily cause indentations or damage to the surface of the cross ring; at the same time, the locating points are prone to wear after long-term use, resulting in a decrease in positioning accuracy, which in turn affects the positional accuracy of hole machining. 3. Unsynchronized clamping due to asynchronous pressure plate movements: The three independent pressure plates exhibit slight differences in their downward pressing speeds, meaning their movements are asynchronous. The cross ring has a thin-walled annular structure, with machining positions evenly distributed at 45° (4 machining surfaces). Under this clamping method, the cross ring is prone to a seesaw-like wobbling with the pressure plates as fulcrum, leading to unstable workpiece positioning during machining and exacerbating flatness issues. 4. Lack of vibration damping structure leads to machining deformation: The clamping plate, made of cemented carbide, is in direct contact with the cross ring, lacking a buffer structure. The cutting forces generated during machining cannot be effectively released or absorbed by the clamping device, causing vibration marks to easily form on the surface of the cross ring. Furthermore, residual machining stress easily accumulates inside the workpiece, leading to deformation in subsequent processes or after natural aging. Crucially, the cross ring has four high and low keys. The high key, due to its longer overhang and weaker rigidity, is more significantly affected by cutting vibration during milling, resulting in occasional deviations in its perpendicularity. This makes it difficult to consistently achieve the machining accuracy requirement of ≤0.004mm, severely impacting the product yield.

[0004] Therefore, how to provide a cross ring clamp that can achieve independent pressure adjustment at a single workstation, adopt a flexible contact method, improve clamping stability, and reduce machining deformation has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the aforementioned technical problems of existing hydraulic clamps, such as asynchronous movements leading to unstable clamping, hard contact causing damage to the workpiece surface, and lack of vibration damping structures resulting in machining deformation, this invention provides a scroll compressor cross ring clamp with flexible clamping function. This invention primarily utilizes a flexible clamping structure to effectively reduce clamping deformation during machining, significantly improving the flatness of the cross ring and the machining accuracy of the hole diameter.

[0006] The technical means employed in this invention are as follows: A scroll compressor cross ring clamp with flexible clamping function includes a reference plate, a reference block, a support block, a pressure plate, a positioning pin, a limit bolt, a stop bolt, a guide pin, and a ball-head plunger. The stop bolt is threaded onto the pressure plate, and its extension length is adjustable. The guide pin is mounted on the reference plate via a spring, providing auxiliary elastic support to the bottom of the cross ring workpiece. The ball-head plunger is mounted on the reference block for rapid pre-positioning of the cross ring workpiece during clamping.

[0007] Furthermore, there are two pressure plates, which are symmetrically hinged to the left and right sides of the support block respectively; the limiting bolts include a first limiting bolt disposed below the reference block and two second limiting bolts disposed at the support block; the second limiting bolts are used to limit the rotation angle of the pressure plates so that the two pressure plates can achieve synchronous pressing action.

[0008] Furthermore, the upper end of the support block is provided with a raised end face, the flatness of which matches the flatness of the cross ring workpiece blank end face, for the purpose of axial positioning of the cross ring workpiece.

[0009] Furthermore, the front end of the guide pin is an R-shaped arc surface; the floating position of the guide pin can be locked by a clamping copper pin and a set screw, the clamping copper pin abuts against the outer diameter surface of the guide pin, and the set screw passes through the clamping copper pin and abuts against the guide pin.

[0010] Furthermore, the end of the stop bolt is provided with a polyurethane layer for forming flexible contact with the surface of the cross-shaped workpiece and applying clamping force.

[0011] Furthermore, there are two ball-head plungers, which are symmetrically arranged on opposite sides of the reference block to allow for alternating use after the two sides of the reference block wear out.

[0012] Furthermore, the reference block is a semi-circular ring structure, and the perpendicularity between the positioning surface and the bottom surface of the reference block is ≤0.01mm, which is used to achieve radial positioning of the cross-ring workpiece.

[0013] Furthermore, the reference plate is a rectangular structure, fixed on the B-axis of the machining center, with a flatness ≤0.002mm, parallelism ≤0.002mm, and surface roughness ≤Rz3.2.

[0014] Furthermore, the positioning pin is a cylindrical structure and is disposed in the positioning hole of the reference plate and the B axis of the machining center for mounting and positioning the reference plate. The positioning pin has an M5 through hole at its center.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This invention achieves radial positioning through the semi-circular structure of the reference block and the cooperation of the limiting bolt, axial positioning through the raised end face of the support block, and rapid pre-positioning through the ball-head plunger. This combined positioning method enables the cross ring to obtain precise constraints in both the horizontal and vertical directions during clamping, effectively solving the problem of inaccurate positioning caused by wear of positioning points in existing hydraulic clamps; 2. This invention employs a Y-shaped pressure plate combined with polyurethane-coated end-mounted locking bolts to form a two-point synchronous clamping method, replacing the three-point asynchronous clamping of existing technologies. This structure eliminates the seesaw-like wobbling of the cross ring during clamping, improving clamping stability. Simultaneously, the flexible contact of the polyurethane layer absorbs cutting vibrations, reducing residual stress during machining, thereby effectively controlling the machining deformation of the cross ring and ensuring a flatness of less than 0.01mm. Especially for high-key machining, due to the significant suppression of vibration, its perpendicularity stability is greatly improved, consistently meeting the design requirement of ≤0.004mm, completely resolving the potential quality issues caused by occasional deviations. 3. The polyurethane layer at the end of the stop bolt of the present invention provides flexible contact, which can absorb cutting vibration and reduce the generation of residual stress during processing; the R-shaped front end of the guide pin avoids damage to the workpiece surface, and the floating support of the spring makes the cross ring evenly stressed, further reducing local deformation of the clamping part. 4. The ball-head plunger of this invention enables rapid pre-positioning of the cross ring without manual support; the pressure plate can automatically unscrew under its own weight, facilitating workpiece loading and unloading. This structure increases the number of stations per clamping operation from 2 stations / face in the prior art to 3 stations / face, reducing the number of tool changes and machining center pallet rotations, and significantly improving production efficiency. 5. The reference block of this invention adopts a symmetrical structural design, with ball-head plunger mounting threaded holes on both the upper and lower sides. When one side wears out after long-term use, the ball-head plunger can be installed on the other side, realizing alternating use of the left and right sides, thus doubling the service life of vulnerable parts and reducing manufacturing costs; In summary, this invention achieves independent adjustable clamping force, flexible contact, rapid clamping, and cost optimization while ensuring machining accuracy. It can be widely applied in the precision machining of cross rings for scroll compressors. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a top view of the cross-ring clamp of the present invention; Figure 2 This is a front view of the cross-ring clamp of the present invention; Figure 3 This is a left view of the cross-ring clamp of the present invention; Figure 4 This is a perspective view of the cross-ring clamp of the present invention.

[0018] In the diagram: 1. Base plate; 2. Base block; 3. Support block; 4. Pressure plate; 5. Positioning pin; 6. Limit bolt; 7. Stop bolt; 8. Spring; 9. Guide pin; 10. Ball head plunger; 11. Clamping copper pin; 12. Set screw. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0023] This invention provides a cross-ring clamp for a scroll compressor with flexible clamping function. For example... Figure 1-4 As shown. Includes: reference plate 1, reference block 2, support block 3, pressure plate 4, positioning pin 5, limit bolt 6, stop bolt 7, spring 8, guide pin 9, ball head plunger 10, clamping copper pin 11, and set screw 12.

[0024] The reference plate 1 is positioned by the locating pin 5 and fixedly installed on the workpiece axis B of the horizontal machining center by bolts. After installation, the flatness of the reference plate 1 is checked using a dial indicator to ensure it is ≤0.002mm.

[0025] The reference block 2 and the support block 3 are fixed on the reference plate 1. After installation, check that the perpendicularity between the positioning surface of the reference block 2 and the bottom surface is ≤0.01mm, and that the flatness of the raised end face of the support block 3 matches the end face of the cross ring blank.

[0026] The limiting bolt 6 includes a first limiting bolt located below the reference block 2 and two second limiting bolts located on the support block 3. The extension height of the first limiting bolt is adjusted so that the distance between its upper end face and the positioning surface of the reference block 2 is equal to the height of the cross ring, for vertical positioning. The position of the second limiting bolts is adjusted so that the pressure plate 4 remains parallel to the ground when clamped, and can rotate approximately 90° under its own weight when released.

[0027] The pressure plate 4 is hinged to the support block 3, and the stop bolt 7 is threaded to the end of the pressure plate 4. The extension length of the stop bolt 7 can be adjusted by rotating it, and the adjustment range is recommended to be 0-5mm.

[0028] Spring 8 is placed into the guide hole of reference plate 1, and guide pin 9 is inserted above spring 8. The initial height of guide pin 9 can be adjusted by set screw 12 and clamping copper pin 11.

[0029] Screw the ball-head plunger 10 into the threaded hole of the reference block 2, to a depth such that the steel ball of the ball-head plunger 10 can lightly press against the side of the cross ring.

[0030] II. Clamping Operation Steps Step 1: Workpiece Placement: The operator places the cross-shaped workpiece into the semi-circular space of the reference block 2, so that the workpiece is roughly in the center position.

[0031] Step 2: Rapid pre-positioning: Under the action of the internal spring, the ball plunger 10 automatically pushes the cross ring workpiece to one side of the reference block 2, achieving preliminary radial positioning.

[0032] Step 3: Vertical positioning: The operator manually pushes the cross ring workpiece downwards so that the lower end face of the workpiece abuts against the first limiting bolt 6 below the reference block 2, thus completing the precise vertical positioning.

[0033] Step 4: Axial Position Confirmation: Check whether the cross-shaped ring workpiece is in close contact with the raised end face of the support block 3. If there is a gap, the position of the workpiece can be finely adjusted or the installation height of the support block 3 can be checked.

[0034] Step 5: Clamping: Rotate the left and right pressure plates 4 respectively, moving the stop bolts 7 on the pressure plates 4 above the cross ring workpiece. Continue pressing down the pressure plates 4 until they contact the second limit bolt 6. At this point, the polyurethane end of the stop bolt 7 contacts the surface of the cross ring. Adjust the extension length of the stop bolt 7 by rotating it to control the clamping force.

[0035] Step 6: Machining: After clamping, start the horizontal machining center. The B-axis rotates as needed, the milling cutter mills the OS surface of the cross ring, and the drill bit drills the positioning hole. During machining, the polyurethane layer of the stop bolt 7 absorbs cutting vibration, and the guide pin 9 floats and supports the bottom of the cross ring under the action of the spring 8.

[0036] Step 7: Workpiece Disassembly: After machining, rotate the pressure plate 4 bolt counterclockwise. The pressure plate 4 will automatically rotate outwards under its own weight to the position defined by the second limit bolt 6. Remove the machined cross ring workpiece and prepare for clamping the next workpiece.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cross-ring clamp for a scroll compressor with flexible clamping function, characterized in that, The system includes a reference plate (1), a reference block (2), a support block (3), a pressure plate (4), a positioning pin (5), a limiting bolt (6), a stop bolt (7), a guide pin (9), and a ball plunger (10). The stop bolt (7) is threaded onto the pressure plate (4), and the extension length of the stop bolt (7) is adjustable. The guide pin (9) is mounted on the reference plate (1) by means of a spring (8) and is used to provide auxiliary elastic support for the bottom of the cross ring workpiece. The ball plunger (10) is mounted on the reference block (2) and is used to quickly pre-position the cross ring workpiece during clamping.

2. The scroll compressor cross-ring clamp with flexible clamping function according to claim 1, characterized in that, There are two pressure plates (4), which are symmetrically hinged to the left and right sides of the support block (3); the limiting bolts (6) include a first limiting bolt set below the reference block (2) and two second limiting bolts set at the support block (3); the second limiting bolts are used to limit the rotation angle of the pressure plates (4) so ​​that the two pressure plates (4) can achieve synchronous pressing action.

3. The scroll compressor cross-ring clamp with flexible clamping function according to claim 2, characterized in that, The upper end of the support block (3) is provided with a raised end face, the flatness of which matches the flatness of the cross ring workpiece blank end face, and is used to realize the axial positioning of the cross ring workpiece.

4. The scroll compressor cross-ring clamp with flexible clamping function according to claim 1, characterized in that, The front end of the guide pin (9) is an R-shaped arc surface; the floating position of the guide pin (9) can be locked by the clamping copper pin (11) and the set screw (12). The clamping copper pin (11) abuts against the outer diameter surface of the guide pin (9), and the set screw (12) passes through the clamping copper pin (11) and abuts against the guide pin (9).

5. The scroll compressor cross-ring clamp with flexible clamping function according to claim 1, characterized in that, The end of the stop bolt (7) is provided with a polyurethane layer for forming a flexible contact with the surface of the cross ring workpiece and applying clamping force.

6. The scroll compressor cross-ring clamp with flexible clamping function according to claim 1, characterized in that, The number of ball-head plungers (10) is two, which are symmetrically arranged on opposite sides of the reference block (2) to realize the alternating use of the reference block (2) after wear on both sides.

7. The scroll compressor cross-ring clamp with flexible clamping function according to claim 1, characterized in that, The reference block (2) is a semi-circular ring structure. The perpendicularity between the positioning surface and the bottom surface of the reference block (2) is ≤0.01mm, which is used to realize the radial positioning of the cross ring workpiece.

8. The scroll compressor cross-ring clamp with flexible clamping function according to claim 1, characterized in that, The reference plate (1) is a rectangular structure, fixed on the B axis of the machining center, with a flatness of ≤0.002mm, a parallelism of ≤0.002mm, and a surface roughness of ≤Rz3.

2.

9. The scroll compressor cross-ring clamp with flexible clamping function according to claim 1, characterized in that, The positioning pin (5) is a cylindrical structure and is set in the positioning hole of the reference plate (1) and the B axis of the machining center. It is used for the installation and positioning of the reference plate (1). The positioning pin (5) has an M5 through hole in the center.

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