An elastic grinding device for grinding the inner wall of aluminum alloy castings

Abstract

The present invention discloses an elastic polishing device for polishing the inner wall of an aluminum alloy casting, and belongs to the technical field of polishing the inner wall of a casting. It includes a base plate, two guide posts and a support frame mounted on the base plate, a pressure plate and a lifting frame slidably mounted on the guide posts, a polishing pressure spring, a pressure rack, a pressure gear meshing with the pressure rack for transmission, a pressure motor for driving the pressure gear to rotate, a connecting piece rotatably mounted on the lifting frame, a polishing motor for driving the connecting piece to rotate, a locking frame rotatably mounted on the support frame, a plurality of casting polishing self-locking assemblies for locking the aluminum alloy casting, a locking motor for driving a plurality of casting polishing self-locking assemblies to synchronously lock or synchronously release the aluminum alloy casting, and a self-rotation power assembly for driving the locking frame to slowly rotate. The present invention is an elastic polishing device with a reasonable structure, which can significantly improve the uniformity of inner wall polishing and can polish the inner wall with high stability.

Description

Technical Field

[0001] The invention mainly relates to the technical field of inner wall grinding of castings, and in particular to an elastic grinding device for grinding the inner wall of aluminum alloy castings. Background Art

[0002] Squeeze casting is the process of pouring molten metal directly into a metal mold to obtain die-cast parts with excellent mechanical properties. Round tubes cast from aluminum alloy materials are widely used in industrial machinery due to their advantages such as high strength and low density. However, the inner wall of cast aluminum round tubes produced by the casting process inevitably produces flash and burrs, so the inner wall needs to be polished during later use. The existing technology for polishing the inner wall of a longer cast aluminum round tube usually involves first fixing the cast aluminum round tube, inserting a polishing rod into the cast aluminum round tube from one end to polish its inner wall, and then inserting the polishing rod into the cast aluminum round tube from the other end to polish its inner wall. Although the existing technology has achieved the inner wall grinding of long cast aluminum round tubes, it still has the following defects: First, the grinding pressure between the grinding rod and the inner wall of the cast aluminum round tube cannot be accurately controlled, resulting in uneven circumferential grinding of the inner wall; Second, the grinding rod is installed with one end fixed and the other end free. This installation method causes the grinding pressure on the inner wall of the cast aluminum round tube to be unevenly distributed along the axial direction, resulting in uneven axial grinding of the inner wall; Third, the clamping and locking method of the cast aluminum round tube has no self-locking function, and it is easy to shake under the action of uneven grinding pressure, that is, the grinding stability is not high. Therefore, it is urgent to design an inner wall grinding device that can significantly improve the uniformity of inner wall grinding. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in response to the technical problems existing in the prior art, the present invention provides an elastic grinding device with a reasonable structure, which can significantly improve the uniformity of inner wall grinding and can grind the inner wall with high stability.

[0004] The camming mechanism that this invention relates to is that this invention relates to a device for grinding the inner wall of an aluminum alloy casting, comprising: a base plate, two guide columns and a support frame mounted on the base plate, the device further comprising: a pressure plate and a lifting frame slidably mounted on the guide columns from bottom to top, the two ends of the pressure spring being fixedly connected to the lifting frame and the pressure plate respectively, a pressure rack fixedly mounted on the pressure plate in a vertical direction, a pressure gear mounted on the guide columns and meshing with the pressure rack for transmission, a pressure motor driving the pressure gear to rotate, a connecting piece mounted on the lifting frame, a grinding motor driving the connecting piece to rotate, a locking frame mounted on the support frame, a plurality of casting grinding self-locking assemblies symmetrically mounted on the locking frame for locking the aluminum alloy casting, a locking motor driving the plurality of casting grinding self-locking assemblies to synchronously lock or synchronously release the aluminum alloy casting, and a rotation power assembly driving the locking frame to slowly rotate;

[0005] One of the guide posts is fixedly mounted on the base plate, and the other guide post is orthogonally slidably mounted on the base plate via an orthogonal movable platform; the two connecting members are respectively connected to the two ends of the polishing rod, and one of the connecting members is detachably fixedly connected to the polishing rod, and the other connecting member is detachably slidably connected to the polishing rod;

[0006] When the polishing rod polishes the inner wall of the aluminum alloy casting, the rotation direction of the polishing rod and the aluminum alloy casting are opposite.

[0007] Furthermore, the casting polishing self-locking assembly includes: a locking sliding rod radially slidingly mounted on the locking frame, a locking piece fixedly mounted on the centripetal end of the locking sliding rod, an elastic telescopic rod A hingedly mounted on the locking frame at one end, an elastic telescopic rod B hingedly mounted on the locking sliding rod at one end, a rack rod, and a composite sprocket rotatably mounted on the locking frame and meshing with the rack rod for transmission; the output shaft of the locking motor is transmission-connected to one of the composite sprockets, the elastic telescopic rod A, the elastic telescopic rod B and the rack rod are hingedly connected at a common point at one end adjacent to the rack rod, and the rack rod is swingingly meshingly connected to the composite sprocket for transmission.

[0008] Furthermore, the composite sprocket is composed of a locking gear and a locking sprocket that are coaxially and synchronously rotated. The locking gear is meshed with the corresponding rack rod for transmission connection, and a plurality of the locking sprockets are connected through a unidirectional transmission chain.

[0009] Furthermore, in the initial state, the rack rod is perpendicular to the locking sliding rod, and the elastic telescopic rod A and the elastic telescopic rod B in the non-collinear state are symmetrical about the rack rod; in the locked state, the elastic telescopic rod A and the elastic telescopic rod B undergo significant and equal compression deformation, and the elastic telescopic rod A, the elastic telescopic rod B and the locking sliding rod are collinear.

[0010] Furthermore, the self-rotation power assembly includes: a driving motor mounted on the support frame, a driving gear fixedly mounted on the output shaft of the driving motor, and an outer gear ring fixedly mounted on the locking frame and externally meshing with the driving gear; a circular through hole is provided in the middle of the locking frame to allow the aluminum alloy casting to pass axially, and the axis of the circular through hole is collinear with the axis of the outer gear ring.

[0011] Compared with the prior art, the present invention has the following advantages and beneficial effects: an elastic polishing device for polishing the inner wall of an aluminum alloy casting is provided with a casting polishing self-locking assembly comprising an elastic telescopic rod A and an elastic telescopic rod B. When the aluminum alloy casting is locked, the elastic telescopic rod A and the elastic telescopic rod B undergo significant and equal compression deformation, and are collinear with the locking sliding rod, thereby achieving a locking effect with a self-locking function and controllable locking force, thereby improving the polishing stability; the present invention is also provided with a polishing pressure spring for accurately regulating the polishing pressure, and during the polishing process, the aluminum alloy casting and the polishing rod rotate in opposite directions, which not only improves the circumferential uniformity of the inner wall polishing, but also improves the inner wall polishing efficiency. In addition, the present invention uses a detachable sliding connection to separate or transmit the left connecting member from the polishing rod, which not only facilitates the placement of the aluminum alloy casting on the polishing rod, but also enables the polishing rod to have a "simply supported beam" installation mode during the polishing process, thereby improving the distribution of the polishing pressure along the axial direction and improving the axial uniformity of the inner wall polishing. It can be seen from this that the present invention is an elastic grinding device with a reasonable structure, which can significantly improve the uniformity of inner wall grinding and can grind the inner wall with high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic diagram of the structural principle of an elastic grinding device for grinding the inner wall of an aluminum alloy casting.

[0013] Figure 2 The diagram is a schematic diagram of the relative positions of several casting polishing self-locking components, an aluminum alloy casting, and a locking frame according to the present invention.

[0014] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at point I.

[0015] In the figure, 11 is a base plate; 12 is a guide column; 13 is a support frame; 14 is a locking frame; 15 is an orthogonal moving platform; 20 is a grinding motor; 21 is a connecting piece; 22 is a lifting frame; 23 is a grinding pressure spring; 24 is a pressure plate; 25 is a pressure rack; 26 is a pressure gear; 3 is a casting grinding self-locking assembly; 31 is a locking piece; 32 is a locking sliding rod; 33 is an elastic telescopic rod A; 34 is an elastic telescopic rod B; 35 is a rack rod; 36 is a compound chain gear; 41 is an outer ring gear; 42 is a driving gear; 43 is a driving motor; 5 is an aluminum alloy casting; 6 is a grinding rod. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. For the sake of convenience, the cast aluminum round tube with the inner wall to be polished and the cast aluminum round tube after the inner wall is polished are uniformly recorded as aluminum alloy casting 5, and the length direction of the polishing rod 6 is recorded as the X-axis direction. Figure 1 The direction from left to right is recorded as the positive direction of the X axis, and the opposite direction is recorded as the negative direction of the X axis; the direction perpendicular to the length of the grinding rod 6 in the horizontal plane is recorded as the Y axis direction, Figure 1 The direction from front to back is recorded as the positive direction of the Y axis, and the opposite direction is recorded as the negative direction of the Y axis; the section perpendicular to the X axis is recorded as the cross section, and the cross section at the location of several locking members 31 is recorded as the locking cross section.

[0017] See also Figures 1 to 3The present invention relates to an elastic grinding device for grinding the inner wall of an aluminum alloy casting, which includes a base plate 11, two guide columns 12 and a support frame 13 mounted on the base plate 11, a pressure plate 24 and a lifting frame 22 mounted on the guide column 12 for sliding upward, a grinding pressure spring 23 fixedly connected to the lifting frame 22 and the pressure plate 24 at both ends, a pressure rack 25 fixedly mounted on the pressure plate 24 in the vertical direction, a pressure gear 26 mounted on the guide column 12 and meshing with the pressure rack 25 for transmission, and a driving force. The pressure motor (not shown in the figure) that rotates the pressure gear 26 rotates the connecting part 21 installed on the lifting frame 22, drives the grinding motor 20 to rotate the connecting part 21, rotates the locking frame 14 installed on the support frame 13, and a plurality of casting grinding self-locking components 3 that are centrally symmetrically installed on the locking frame 14 and are used to lock the aluminum alloy casting 5, a locking motor (not shown in the figure) that drives the plurality of casting grinding self-locking components 3 to synchronously lock or synchronously release the aluminum alloy casting 5, and a rotation power component that drives the locking frame 14 to slowly rotate. During specific implementation, the support frame 13 is installed in the middle of the two guide columns 12, and the grinding rod 6 is symmetrical about the locking cross section. The aluminum alloy casting 5 passes through the locking frame 14 along the X-axis direction and is placed on the grinding rod 6. The aluminum alloy casting 5 after being clamped and locked can be symmetrical about the locking cross section, so that the grinding pressure generated by the grinding rod 6 on the inner wall of the aluminum alloy casting 5 is more uniform; the grinding pressure spring 23 is a compression-resistant metal coil spring with a constant stiffness. The precise control of the grinding pressure is achieved by controlling the compression deformation of the grinding pressure spring 23; in this embodiment, a total of four casting grinding self-locking components 3 are provided.

[0018] One of the guide posts 12 is fixedly mounted on the base plate 11, and the other guide post 12 is orthogonally slidably mounted on the base plate 11 through an orthogonal movable platform 15; two connecting pieces 21 are respectively connected to the two ends of the grinding rod 6, and one of the connecting pieces 21 is detachably fixedly connected to the grinding rod 6, and the other connecting piece 21 is detachably slidably connected to the grinding rod 6; in specific implementation, the guide post 12 on the left is fixedly mounted on the orthogonal movable platform 15, and the guide post 12 on the right is directly fixedly mounted on the base plate 11; The cross-moving platform 15 can drive the guide column 12 on the left to move orthogonally in the X-axis direction and the Y-axis direction in the horizontal plane, thereby realizing the orthogonal sliding installation of the guide column 12 on the left; as an embodiment 1, the right connecting piece 21 and the right end of the grinding rod 6 adopt a transition fit method to achieve a detachable fixed connection; as an embodiment 2, the right connecting piece 21 and the right end of the grinding rod 6 can also adopt a chuck connection method to achieve a detachable fixed connection. The transition fit method and the chuck connection method are both existing technologies and will not be repeated here. To achieve a detachable sliding connection, the left connector 21 is provided with a tapered hole, with the larger end facing the polishing rod 6. The left end of the polishing rod 6 is tapered, with the smaller end facing the left. The tapered end of the polishing rod 6 and the tapered hole of the connector 21 have the same taper. When the orthogonal movable platform 15 drives the left guide post 12 to move in the positive direction of the X-axis, the left connector 21 moves toward the tapered end of the polishing rod 6 until the tapered hole is tightly fitted on the tapered end of the polishing rod 6. When the orthogonal movable platform 15 drives the left guide post 12 to move in the negative direction of the X-axis, the left connector 21 casting is withdrawn from the tapered end of the polishing rod 6 until the two are completely separated. When the aluminum alloy casting 5 is placed on the polishing rod 6 or removed from the polishing rod 6, the left connector 21 is in a separated state from the polishing rod 6. When the polishing rod 6 is polishing the inner wall of the aluminum alloy casting 5, the left connector 21 is in a transmission connection state with the polishing rod 6.

[0019] When the grinding rod 6 grinds the inner wall of the aluminum alloy casting 5 , the two rotate in opposite directions, so that the grinding rod 6 and the aluminum alloy casting 5 have opposite circumferential motion speeds at the contact point between the two, thereby improving the grinding efficiency.

[0020] Preferably, the casting polishing self-locking assembly 3 includes: a locking sliding rod 32 radially slidingly mounted on the locking frame 14, a locking member 31 fixedly mounted on the centripetal end of the locking sliding rod 32, an elastic telescopic rod A33 hingedly mounted on the locking frame 14 at one end, an elastic telescopic rod B34 hingedly mounted on the locking sliding rod 32 at one end, a rack rod 35, and a composite sprocket 36 rotatably mounted on the locking frame 14 and meshing with the rack rod 35; the output shaft of the locking motor is transmission-connected to one of the composite sprockets 36, the elastic telescopic rod A33, the elastic telescopic rod B34 and the rack rod 35 are hingedly connected at a common point at one end adjacent to the rack rod 35, and the rack rod 35 is swingingly meshingly connected to the composite sprocket 36. During specific implementation, an arc-shaped groove is provided on the rack rod 35, and the center of the arc-shaped groove is located at the rotation center of the composite sprocket 36. An arc-shaped slider is slidably installed in the arc-shaped groove. The arc-shaped slider is connected to the rotating shaft of the composite sprocket 36 by a metal spring that is always under tension, thereby ensuring that the rack rod 35 is always in a meshing transmission state with the composite sprocket 36 during the swinging process. During specific use, when the locking motor (not shown in the figure) drives the composite sprocket 36 to rotate clockwise, the elastic telescopic rod A33 and the elastic telescopic rod B34 move from the non-collinear state in the initial state to the collinear state in the self-locking state, and the locking slide rod 32 pushes the locking member 31 to move radially and centripetally along the aluminum alloy casting 5 until the elastic telescopic rod A33, the elastic telescopic rod B34 and the locking slide rod 32 are collinear. At this time, several locking members 31 lock the outer wall of the aluminum alloy casting 5, and the elastic telescopic rod A33 and the elastic telescopic rod B34 are in a collinear state. The length of the telescopic rod B34 is reduced, but the sum of their lengths is greater than the distance between the two hinge points in the initial state; when the locking motor (not shown in the figure) drives the composite sprocket 36 to rotate counterclockwise, the elastic telescopic rod A33 and the elastic telescopic rod B34 move from a collinear state to a non-collinear state, and the locking member 31 moves in a direction away from the aluminum alloy casting 5, and the locking member 31 returns to the initial position, that is, the locking member 31 and the aluminum alloy casting 5 are in a non-contact state, and the elastic telescopic rod A33 and the elastic telescopic rod B34 return to their initial length.

[0021] Preferably, the composite sprocket 36 is composed of a locking gear (not shown in the figure) and a locking sprocket (not shown in the figure) which are coaxially and synchronously mounted for rotation. The locking gear (not shown in the figure) is meshed with the corresponding rack rod 35 for transmission connection, and several locking sprockets (not shown in the figure) are connected for transmission through a unidirectional transmission chain (not shown in the figure).

[0022] Preferably, in the initial state, the rack rod 35 is perpendicular to the locking sliding rod 32, and the elastic telescopic rod A33 and the elastic telescopic rod B34 in a non-collinear state are symmetrical about the rack rod 35; in the locking state, the elastic telescopic rod A33 and the elastic telescopic rod B34 undergo significant and equal compression deformation, the elastic telescopic rod A33, the elastic telescopic rod B34 and the locking sliding rod 32 are collinear, and the rack rod 35 rotates clockwise, that is, the upper end of the rack rod 35 tilts toward the locking member 31.

[0023] Preferably, the self-rotation power assembly includes: a drive motor 43 mounted on the support frame 13, a drive gear 42 fixedly mounted on the output shaft of the drive motor 43, and an outer gear ring 41 fixedly mounted on the locking frame 14 and externally meshing with the drive gear 42; a circular through hole is provided in the middle of the locking frame 14 to allow the aluminum alloy casting 5 to pass axially, and the axis of the circular through hole is collinear with the axis of the outer gear ring 41.

[0024] The working process and working principle of the present invention are as follows:

[0025] In the first step, the orthogonal moving platform 15 drives the left guide column 12 to move first in the negative direction of the X axis and then in the negative direction of the Y axis, so that the left connecting piece 21 is separated from the grinding rod 6;

[0026] In the second step, the operator puts the aluminum alloy casting 5 onto the polishing rod 6 from left to right, and makes the aluminum alloy casting 5 be located in the center of the plurality of locking pieces 31;

[0027] Step 3: The orthogonal moving platform 15 drives the left guide column 12 to move first along the positive direction of the Y axis and then along the positive direction of the X axis, so that the left connecting piece 21 and the grinding rod 6 are in a transmission connection state;

[0028] Step 4: The locking motor (not shown) drives the composite sprocket 36 to rotate clockwise, and the same-direction transmission chain (not shown) rotates clockwise, and the plurality of locking sliding rods 32 move centripetally synchronously, and the casting polishing self-locking assembly 3 locks the aluminum alloy casting 5;

[0029] Step 5: The pressure motor (not shown) drives the pressure gear 26 to rotate forward, causing the pressure rack 25 to move upward to compress the polishing pressure spring 23, and the lifting frame 22 drives the polishing rod 6 upward to press against the inner wall of the aluminum alloy casting 5;

[0030] Step 6: The driving motor 43 drives the aluminum alloy casting 5 to rotate slowly in the forward direction, while the polishing motor 20 drives the polishing rod 6 to rotate in the reverse direction at high speed, and the polishing rod 6 polishes the inner wall of the aluminum alloy casting 5;

[0031] Step 7. After the grinding is completed, the pressure motor (not shown in the figure) drives the pressure gear 26 to rotate in the opposite direction, and the grinding rod 6 moves downward to reset; the locking motor (not shown in the figure) drives the casting grinding self-locking assembly 3 to reset, and several locking parts 31 synchronously move centrifugally to loosen the aluminum alloy casting 5; the orthogonal moving platform 15 drives the guide column 12 on the left to move orthogonally, and the connecting part 21 on the left is in a separated state from the grinding rod 6, and the operator removes the aluminum alloy casting 5 from the grinding rod 6.

[0032] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or replacements that are not conceived through creative work should fall within the protection scope of the present invention.

Claims

1. An elastic grinding device for grinding the inner wall of an aluminum alloy casting, comprising a base plate (11), two guide columns (12) and a support frame (13) mounted on the base plate (11), characterized in that: Also includes: The pressure plate (24) and the lifting frame (22) are slidably mounted on the guide column (12) from bottom to top, the grinding pressure spring (23) is fixedly connected to the lifting frame (22) and the pressure plate (24) at both ends, the pressure rack (25) is fixedly mounted on the pressure plate (24) in the vertical direction, the pressure gear (26) mounted on the guide column (12) and meshing with the pressure rack (25) is rotated, the pressure motor drives the pressure gear (26) to rotate, and the pressure gear (26) is rotated. (22), a connecting member (21) on the connecting member (21), a grinding motor (20) for driving the connecting member (21) to rotate, a locking frame (14) mounted on the supporting frame (13), a plurality of casting grinding self-locking assemblies (3) centrally symmetrically mounted on the locking frame (14) for locking the aluminum alloy casting (5), a locking motor for driving the plurality of casting grinding self-locking assemblies (3) to synchronously lock or synchronously release the aluminum alloy casting (5), and a rotation power assembly for driving the locking frame (14) to slowly rotate; One of the guide columns (12) is fixedly mounted on the base plate (11), and the other guide column (12) is orthogonally slidably mounted on the base plate (11) via an orthogonal movable platform (15); the two connecting members (21) are respectively connected to the two ends of the grinding rod (6), and one of the connecting members (21) is detachably fixedly connected to the grinding rod (6), and the other connecting member (21) is detachably slidably connected to the grinding rod (6); When the grinding rod (6) grinds the inner wall of the aluminum alloy casting (5), the grinding rod (6) and the aluminum alloy casting (5) rotate in opposite directions.

2. The elastic grinding device for grinding the inner wall of aluminum alloy casting according to claim 1, characterized in that: The casting grinding self-locking assembly (3) comprises: a locking sliding rod (32) radially slidably mounted on the locking frame (14), a locking member (31) fixedly mounted on the centripetal end of the locking sliding rod (32), an elastic telescopic rod A (33) hingedly mounted on the locking frame (14) at one end, an elastic telescopic rod B (34) hingedly mounted on the locking sliding rod (32) at one end, a rack rod (35), and a locking member (31) rotatably mounted on the locking frame (14) and fixedly mounted on the centripetal end of the locking sliding rod (32). The rack rod (35) is meshed with a composite sprocket (36) for transmission; the composite sprocket (36) is composed of a locking gear and a locking sprocket that are coaxially and synchronously rotated, the output shaft of the locking motor is transmission-connected to one of the composite sprockets (36), the elastic telescopic rod A (33), the elastic telescopic rod B (34) and the rack rod (35) are hingedly connected at a common point at one end adjacent thereto, and the rack rod (35) is swing-meshed with the composite sprocket (36) for transmission connection.

3. The elastic grinding device for grinding the inner wall of aluminum alloy casting according to claim 2, characterized in that: The locking gear is meshed with the corresponding rack rod (35) for transmission connection, and a plurality of locking sprockets are connected through a same-direction transmission chain.

4. The elastic grinding device for grinding the inner wall of aluminum alloy casting according to claim 2, characterized in that: In the initial state, the rack rod (35) is perpendicular to the locking sliding rod (32), and the elastic telescopic rod A (33) and the elastic telescopic rod B (34) in a non-collinear state are symmetrical about the rack rod (35); in the locking state, the elastic telescopic rod A (33) and the elastic telescopic rod B (34) undergo significant and equal compression deformation, and the elastic telescopic rod A (33), the elastic telescopic rod B (34) and the locking sliding rod (32) are collinear.

5. The elastic grinding device for grinding the inner wall of aluminum alloy casting according to claim 1, characterized in that: The self-rotation power assembly comprises: a driving motor (43) mounted on the support frame (13), a driving gear (42) fixedly mounted on the output shaft of the driving motor (43), and an outer gear ring (41) fixedly mounted on the locking frame (14) and externally meshing with the driving gear (42); a circular through hole is provided in the middle of the locking frame (14) to allow the aluminum alloy casting (5) to pass axially, and the axis of the circular through hole is collinear with the axis of the outer gear ring (41).

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