Numerically controlled grinding machine provided with workpiece holding device

Abstract

The utility model relates to numerical control grinding machine with workpiece holding device, its workpiece holding device is equipped with double output worm gear mechanism, upper holding mechanism and lower holding mechanism, upper holding mechanism is equipped with upper support screw mechanism, and the front end of its upper support guide sleeve is connected with the upper support block for workpiece lateral holding, the upper gear of double output worm gear mechanism is connected with the rear end transmission of upper support screw rod axle, lower holding mechanism includes lower support screw mechanism and lower support lever mechanism, and the lower support seat middle part rotation of lower support lever mechanism is connected in workpiece holding device base frame, the rear end is connected with the transmission of lower support screw mechanism lower support guide sleeve, and the front end is equipped with the lower support block for workpiece below holding. The utility model can realize the synchronous automatic regulation of upper support block and lower support block, keep holding to workpiece in grinding processing, and be suitable for the grinding processing of slender workpiece.

Description

Technical Field

[0001] This utility model relates to a CNC grinding machine equipped with a workpiece holding device. This CNC grinding machine can hold the workpiece during grinding and is suitable for grinding slender workpieces. It belongs to the field of machining technology. Background Technology

[0002] In the machining of slender rod-shaped parts, CNC grinding machines typically use a workpiece support device. This device can be single or multiple, installed at appropriate locations on the machine bed to prevent the slender workpiece from bending. However, most existing workpiece support devices are manually adjustable, thus failing to automatically adjust their position as the workpiece grinds, affecting machining accuracy and efficiency. Some machines also use hydraulically driven three-point centering devices to lock the workpiece; however, because the three support points in contact with the workpiece in these devices are made of hard, wear-resistant materials such as carbide, grinding marks appear at the support points during workpiece rotation, and these marks are difficult to remove. Utility Model Content

[0003] The purpose of this invention is to achieve automatic adjustment of the workpiece holding device, so as to eliminate the negative impact on processing accuracy or production efficiency caused by the need for manual adjustment.

[0004] The technical solution of this utility model is as follows: a CNC grinding machine equipped with a workpiece holding device, wherein the workpiece holding device is provided with a double-output worm gear mechanism, an upper holding mechanism and a lower holding mechanism. The double-output worm gear mechanism is provided with a vertical worm shaft and an upper gear (also called a worm wheel) and a lower gear meshing with the worm shaft. The upper holding mechanism is provided with an upper support screw mechanism, which includes a longitudinal upper support screw shaft and an upper support guide sleeve threaded with the upper support screw shaft. The front end of the upper support guide sleeve is connected to an upper support block for lateral workpiece holding. The upper gear is drivenly connected to the rear end of the upper support screw shaft (for example, coaxially connected through a coupling). The lower support mechanism includes a lower support screw mechanism and a lower support lever mechanism. The lower support screw mechanism includes a longitudinal lower support screw shaft and a lower support guide sleeve threaded with the lower support screw shaft. The lower support lever mechanism includes a lower support seat (which can be considered a lever). The middle part of the lower support seat is rotatably connected to (for example, via a rotating shaft and a bearing for mounting the rotating shaft; the specific position of the rotating shaft is set according to actual needs) the workpiece support device frame (fixed component). The lower support seat is inclined with a higher front end and a lower rear end. Its rear end (or lower end) is drivenly connected to the lower support guide sleeve, and its front end (or upper end) is provided with a lower support block for supporting the workpiece from below. When grinding the side (circumferential surface) of a workpiece using a CNC grinding machine, by reasonably setting the dimensions and transmission ratio of each part of the upper and lower support mechanisms, the longitudinal movement distance of the upper support block is the same as the vertical movement distance of the lower support block (within an allowable range), so as to adapt to the change in the diameter of the workpiece during the grinding process. The workpiece holding device can be installed at a suitable position on the bed based on existing technology, and the workpiece holding device can be controlled by the grinding machine control system. The servo motor is controlled according to the change of workpiece diameter, and the servo motor drives the double-output worm gear mechanism to move, thereby driving the upper support block and the lower support block to move synchronously.

[0005] The dual-output worm gear mechanism (worm shaft and each gear shaft) can be mounted on the servo support seat of the workpiece holding device base frame via bearings, and the workpiece holding device base frame can be mounted at a suitable position on the bed of the CNC grinding machine.

[0006] The dual-output worm gear mechanism can use a servo motor as the drive device. The servo motor is mounted on a servo support, and its output (e.g., the output shaft extension of a servo motor reducer) drives the upper end of the worm shaft (e.g., coaxially connected via a coupling) to rotate the worm shaft.

[0007] Preferably, the upper and lower gears can have the same or different number of teeth to achieve the same or different rotational speeds between them. Depending on actual needs or specific design, this can be used as a means or one of the means to adjust the ratio between the longitudinal movement distance of the upper support and the vertical movement distance of the lower support.

[0008] Preferably, the pitches of the upper support screw mechanism and the lower support screw mechanism can be the same or different. Depending on actual needs or specific design, this can be used as a means or one of the means to adjust the ratio between the longitudinal movement distance of the upper support seat and the vertical movement distance of the lower support seat.

[0009] Preferably, an upper support fixing sleeve (e.g., fixed to the side plates on both sides by means of a bracket or connector) is fixedly installed on the base frame of the workpiece holding device. An upper support guide sleeve is fitted inside the upper support fixing sleeve and slides with the upper support fixing sleeve. An upper support linear guide structure is provided between the upper support fixing sleeve and the upper support guide sleeve to limit the upper support guide sleeve to slide only in a straight line inside the upper support fixing sleeve.

[0010] Preferably, the upper support seat is fixedly installed at the front end of the upper support guide sleeve; or, the upper support seat is threadedly connected to the upper support guide sleeve through an upper support fine-tuning sleeve sleeved on its outer side.

[0011] Preferably, the upper support block, at least the supporting surface of the upper support block (the surface that directly contacts the workpiece), is made of a material with suitable hardness for support.

[0012] Preferably, the front end face of the upper support block is a plane, forming a side support surface that contacts the workpiece.

[0013] Depending on the actual needs, the edge portion (edge ​​corner) of the front face of the upper support block can be rounded.

[0014] Preferably, a lower support fixing sleeve is fixedly installed on the base frame of the workpiece holding device (for example, fixed to the side plates on both sides from both sides by a bracket or connector), and a lower support guide sleeve is sleeved in the lower support fixing sleeve and slides with the lower support fixing sleeve. A lower support linear guide structure is provided between the lower support fixing sleeve and the lower support guide sleeve to limit the lower support guide sleeve to slide only in a straight line in the lower support fixing sleeve.

[0015] Preferably, a top block is fixedly mounted on the front end of the lower support guide sleeve. The front end of the top block is a smooth curved surface (e.g., a spherical cap surface) that abuts against the rear end face of the lower support seat to push the lower support seat to rotate. The rear end face of the lower support seat is preferably flat, thereby allowing the front end of the top block to slide on the rear end face of the lower support seat. The lower support seat (including the lower support block mounted on the lower support seat) can rely on its own weight to have a downward rotational tendency at its front end, so as to maintain pressure contact between the rear end face of the lower support seat and the front end of the top block.

[0016] Preferably, the forearm of the lower support (the part located in front of its pivot) can be nearly horizontal (the angle between it and the horizontal plane is less than 45 degrees, for example, 5-30 degrees), so that the displacement of the lower support block (the displacement during actual operation) is mainly vertical; the rear arm of the lower support (the part located behind its pivot) can be nearly vertical (the angle between it and the vertical line is less than 45 degrees, for example, 5-30 degrees), so that the longitudinal movement of the top block is effectively converted into the rotation of the lower support. By reasonably setting the pivot position of the lower support and the initial angle and length of the forearm, the movement trajectory of the upper support block (the support surface of the upper support block) is set to meet the support requirements. By reasonably setting the length and initial angle of the front and rear arms of the lower support, the relationship between the displacement of the rear end and the front end of the lower support is set. Depending on actual needs or specific design, this can be used as a means or one of the means to adjust the ratio between the longitudinal movement distance of the upper support and the vertical movement distance of the lower support.

[0017] Preferably, the lower support block, at least the supporting surface of the lower support block, is made of a material with suitable hardness for support.

[0018] Preferably, the front end face of the lower support block is a plane, forming a lower support surface that contacts the workpiece.

[0019] The beneficial effects of this utility model are as follows: Due to the inclusion of a workpiece holding device, the workpiece is held during processing, avoiding or reducing bending and corresponding vibration of slender workpieces. Furthermore, the upper and lower holding mechanisms can move synchronously under the drive of a servo motor, allowing the upper and lower support blocks to move with the workpiece during grinding, maintaining a suitable holding position and providing conditions for achieving high processing accuracy. This also avoids the extra time and impact on processing accuracy caused by manual adjustment. The upper and lower holding mechanisms support the workpiece from the horizontal side and below, clamping it together with the grinding wheel, achieving and maintaining centering. This design is suitable for various workpieces, especially slender workpieces. Support; Since the support blocks of each support mechanism abut against the workpiece surface, and the support blocks or their surface layers can be made of soft, wear-resistant materials, it helps to avoid the formation of grinding marks on the workpiece surface; Since the upper and lower support mechanisms are driven synchronously by a dual-output worm gear mechanism, and each part of the upper and lower support mechanisms can adopt appropriate dimensions and transmission ratios, the upper and lower support blocks move synchronously according to the set moving distance relationship (ratio) throughout the entire processing process, always maintaining a suitable support position, thereby meeting the lateral and downward support requirements of the workpiece during processing, which helps to simplify the mechanical structure, reduce the data acquisition and processing volume of the control system, and help to ensure the accuracy and reliability of the support. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the workpiece holding device involved in this utility model; Figure 2 Is with Figure 1 Corresponding A-direction construction diagram; Figure 3 This is a schematic diagram of the upper support part of the workpiece support device involved in this utility model; Figure 4 Is with Figure 3 A schematic diagram of the corresponding fine-tuning mechanism; Figure 5 This is a schematic diagram of the lower support portion of the workpiece support device involved in this utility model; Figure 6 This is a schematic diagram of the upper and lower supporting parts of the workpiece supporting device involved in this utility model working together to support the workpiece.

[0021] The markings in the diagram are: 1. Servo motor; 2. Thrust bearing; 3. Worm shaft; 4. Self-lubricating bearing; 5. Servo support base; 6. Upper gear; 7. Lower gear; 8. Support base; 9. Upper support threaded screw; 10. Upper support guide screw; 11. Upper support guide sleeve; 12. Upper support positioning circlip; 13. Upper support fine-tuning sleeve; 14. Upper support base; 15. Upper support block; 16. Lower support threaded screw; 17. Lower support guide sleeve; 18. Lower support guide screw; 19. Lower support pin; 20. Lower support base; 21. Lower support shaft; 22. Lower support block. Detailed Implementation

[0022] See Figures 1 to 5 This CNC grinding machine's workpiece holding device mainly consists of a dual-output worm gear mechanism, an upper holding mechanism (upper holding part), and a lower holding mechanism (lower holding part). The dual-output worm gear mechanism has two worm gears (or gears) output, which drive the upper and lower holding mechanisms respectively. The servo support base 5 and the support base 8 are fixed together with screws to form the workpiece holding device frame. The shape of the support base is set according to the installation requirements of related components, and it has two side plates for installing the lower support shaft and other related components. The servo motor 1 (motor mount) is fixed to the servo support base 5 with screws. The worm shaft (or worm) 3 is vertically positioned and rotatably mounted on the servo support 5 via the upper thrust bearing 2 and the lower self-lubricating bearing 4. The servo motor 1 can also be vertically positioned and coaxially connected to the drive worm shaft 3, enabling it to rotate. The upper gear (or upper support worm wheel) 6 and the lower gear (or lower support worm wheel) 7 both mesh with the worm shaft 3. When the worm shaft 3 rotates, it drives the upper gear 6 and the lower gear 7 to rotate simultaneously. The rotation axes of the upper gear 6 and the lower gear 7 are both longitudinal (corresponding to...). Figure 1 (in the left and right directions), it can be located on the same side of the worm shaft 3. The rear end of the upper support threaded screw 9 (corresponding to) Figure 1The left end (or inner end, hereinafter the same) is coaxially fixedly connected to the upper gear 6. When the upper gear 6 rotates, it drives the upper support threaded screw 9 to rotate together. The front part of the upper support threaded screw 9 is threadedly connected to the upper support guide sleeve 11. The upper support guide sleeve 11 is fitted inside the upper support fixed sleeve and slides with the upper support fixed sleeve. An upper support linear guide structure (or linear guide structure) is provided between the two. The upper support fixed sleeve is fixedly connected to the support base 8. Its rear part can be connected to the upper support threaded screw 9 through a bearing to realize the rotational support of the upper support threaded screw. The upper support linear guide mechanism includes a threaded connection to the upper support... The upper support guide screw 10 on the upper support fixed sleeve and the upper support guide sleeve 11 on the side have an upper support guide groove (hereinafter referred to as guide groove) that mates with the upper support guide screw 10. The upper support guide screw 10 passes through the side wall of the upper support fixed sleeve, and its inner end extends into the upper support guide groove and slides with the upper support guide groove. This allows the upper support guide screw 10 to restrict the upper support guide sleeve 11 from rotating. When the upper support threaded screw 9 rotates, it transmits power to the upper support guide sleeve 11 through the thread between the two. The upper support guide sleeve 11 moves longitudinally (forward or backward) under the guidance and restriction of the corresponding linear guide mechanism.

[0023] An upper support seat 14 is mounted on the front end of the upper support guide sleeve 11. An upper support block 15 is fixedly mounted on the front end of the upper support seat 14. The upper support block 15 can be an independent component fixedly mounted on the upper support seat 14, or it can be integral with the upper support seat 14 (manufactured as a single component). An upper support fine-tuning sleeve 13 is fixedly sleeved on the outer side of the upper support seat 14, and an upper support positioning snap ring 12 is provided to fix the upper support fine-tuning sleeve 13 on the upper support seat. When the upper support guide sleeve 11 moves longitudinally, it drives the upper support fine-tuning sleeve 13, the upper support seat 14, and the upper support block 15 to move forward or backward as a whole. The upper support fine-tuning sleeve 13 is threadedly connected to the front end of the upper support guide sleeve 11, thereby realizing the threaded connection of the upper support seat 14 on the upper support guide sleeve 11. In use, the longitudinal position of the upper support fine-tuning sleeve 13 can be adjusted according to actual needs to achieve fine-tuning of the position of the upper support block, so that the upper and lower support blocks of the holding device can simultaneously fit / support the corresponding surfaces of the corresponding parts of the workpiece.

[0024] The rear end of the lower support threaded screw 16 is coaxially fixedly connected to the lower gear 7. When the lower gear 7 rotates, it drives the lower support threaded screw 16 to rotate together. The front part of the lower support threaded screw 16 is threadedly connected to the lower support guide sleeve 17. The lower support guide sleeve 17 is fitted inside the lower support fixed sleeve and slides with it. A lower support linear guide structure is provided between the two. The lower support fixed sleeve is fixedly connected to the support base 8. Its rear part can be connected to the lower support threaded screw 16 through a bearing to achieve rotational support for the lower support threaded screw. The lower support linear guide mechanism includes a threaded connection to the lower support fixed sleeve. The lower support guide screw 18 and the lower support guide sleeve 17 have a lower support guide groove (hereinafter referred to as guide groove) on their sides that mates with the lower support guide screw 18. The lower support guide screw 18 passes through the side wall of the lower support fixed sleeve, and its inner end extends into the lower support guide groove and slides with it. This allows the lower support guide screw 18 to restrict the lower support guide sleeve 17 from rotating. When the lower support threaded screw 16 rotates, it transmits power to the lower support guide sleeve 17 through the thread between the two. The lower support guide sleeve 17 moves longitudinally (forward or backward) under the guidance and restriction of the corresponding linear guide mechanism.

[0025] The lower support 20 is connected to the support base 8 via a lower support shaft 21. The lower support shaft 21 is mounted on the side plates of the support base 8 via bearings at both ends, thereby allowing the lower support 20 to swing / rotate around the axis of the lower support shaft 21. The lower support block 22 is fixed to the supporting end (or upper end, or front end) of the lower support 20 with screws, and its upper end face supports the workpiece below. When appropriate, the lower support block 15 and the upper support 14 can also be integrated (manufactured as a single part).

[0026] The front end of the lower support pin 19, used as a top block, abuts against the rear end of the lower support seat 20, thereby supporting the lower support seat 20 and keeping it stable. It can also rotate the lower support seat 20 around the axis of the lower support shaft 21 by pushing its rear end. The front end of the lower support pin 19 can be round (the head surface is a smooth convex curved surface). The rear end face of the lower support seat 20 that contacts the front end of the lower support pin can be flat and can have a certain inclination to facilitate the stability of the transmission between the lower support pin 19 and the lower support seat 20. The inclination of the rear end face of the lower support seat 20 can be determined by the movement trajectory of the front end of the lower support pin 19 and the movement trajectory of the rear end of the lower support seat 20. The tilt angle can also be set based on experience to adjust the tilt angle of the rear end face of the lower support seat 20, so that the two can transmit power effectively and stably during relative movement. The lower support pin 19 is threaded or fixedly connected to the front end of the lower support guide sleeve 17. When the lower support guide sleeve 17 moves forward, the lower support pin 19 pushes the lower support seat 20 to rotate around the lower support shaft 21. When the lower support pin 19 is connected to the front end of the lower support guide sleeve 17 by a threaded connection, the screw depth of the lower support pin 19 can be adjusted according to actual needs during assembly or use, thereby changing the posture of the lower support seat 20 and the position of the top surface (upper end face) of the lower support block 22.

[0027] The lower support block 22 can be fixedly installed at the front end of the lower support seat 20 by means of threaded connection, and the two are fixed as one, so that the lower support block 22 rotates together with the lower support seat 20 around the lower support shaft 21 under the drive of the lower support seat 20.

[0028] As mentioned above, the upper support portion is constrained to have only one degree of freedom in the forward and backward directions, and the lower support portion is constrained to have only one degree of freedom in rotation relative to the lower support base 20. The servo motor 1 synchronously drives the upper and lower support portions to move according to their respective motion modes via the worm shaft, so that the upper support block 15 and the lower support block 22 maintain their respective appropriate support (support) positions as the workpiece is being ground. Figure 5As shown, when the workpiece diameter changes, the lower support block (upper end face) 22 moves from point A to point B, the upper support block (front end face) 15 moves from point C to point D, and the lower support pin (top end) 19 moves from point E to point F. Let the movement distance from point E to point F be X, requiring the lower support threaded screw 16 to helically drive the lower support pin 19 to move a distance of X; let the movement distance from point C to point D be Y, requiring the upper support threaded screw 9 to helically drive the upper support block 15 to move a distance of Y. Since X and Y are not equal, the upper support threaded screw 9 and the lower support threaded screw 16 need to be set to two threaded screws with different pitches to ensure that the lower support portion moves a distance X and the side support portion moves a distance Y under the same rotation of the upper gear 6 and the lower gear 7. Alternatively, by adjusting the number of teeth on the upper gear 6 and the lower gear 7, and matching the different pitches of the upper support threaded screw 9 and the lower support threaded screw 16, a precise ratio of the X and Y movement distances can be achieved. The upper support threaded screw 9 and the lower support threaded screw 16 are two threaded screws with different pitches. By setting the ratio and coordinating it with the structural ratio of the lower support seat 20 relative to the front and rear (or up and down) sides of the lower support shaft, the upper support block 15 and the lower support block 22 can be simultaneously in contact with the workpiece support position throughout the entire processing under the driving action of the upper gear 6 and the lower gear 7.

[0029] The fine-tuning of the upper support section is achieved by connecting the upper support fine-tuning sleeve 13 and the upper support guide sleeve 11 via a threaded connection. The upper support fine-tuning sleeve 13 rotates within the upper support guide sleeve 11, allowing it to move forward or backward relative to the upper support guide sleeve 11. The upper support seat 14 and the upper support positioning snap ring 12 combine to constrain the upper support fine-tuning sleeve 13 onto the upper support seat 14. The upper support fine-tuning sleeve 13 can only rotate on the upper support seat 14. The upper support guide sleeve 11 has a guide groove, and the upper support seat 14 can only slide horizontally (longitudinally) under the linear guidance constraint of the upper support guide sleeve 11 (guide groove and guide screw). This ensures that the contact position between the upper support block 15 and the workpiece remains unchanged during the fine-tuning process of the upper support fine-tuning sleeve 13. Thus, by adjusting the rotation of the upper support fine-tuning sleeve 13 to push the upper support block 15, the upper support block 15 can be moved forward or backward.

[0030] The upper support base 14 and the upper support block 15 are connected by threads, which facilitates the replacement of the upper support block 15 after it has reached its limit. The lower support base 20 and the lower support block 22 are connected by threads, which facilitates the replacement of the lower support block 22 after it has reached its limit.

[0031] The thread distribution area of ​​each threaded component (a component with threads) can be set according to actual needs. For example, for the part of each guide screw (upper support guide screw and lower support guide screw) that extends into the guide groove, a smooth rod suitable for sliding fit with the guide groove wall should be used, and it is not necessary and should not have threads. Each threaded screw can also have external threads only at the part that fits with the thread of its corresponding guide sleeve.

[0032] This invention can be used in CNC grinding machines and other machining equipment to support workpieces, especially slender workpieces. Under the control of the machine tool control system, the servo motor drives the upper and lower support blocks to move in tandem, meeting the lateral and bottom support requirements of the workpiece during continuous grinding. The control system can be implemented based on the existing photoelectric sensing device and external diameter measuring device configured on the CNC grinding machine. If necessary, a separate matching photoelectric sensing device and diameter measuring device can also be configured. The photoelectric sensing device monitors the size of the grinding sparks during grinding and compares it in real time with the size range set by the diameter measuring device. By comparing the grinding diameter and the size of the grinding sparks, the system comprehensively judges the program feed or retraction amount and the stop feed time sequence, and sends the feed amount to the servo drive, realizing adjustable feed during the grinding process. After grinding, the machine returns to the initial position set by the servo.

[0033] Unless otherwise specified, the preferred and optional technical means disclosed in this utility model can be arbitrarily combined to form several different specific embodiments when one preferred or optional technical means is a further limitation of another technical means.

Claims

1. A CNC grinding machine equipped with a workpiece holding device, characterized in that... The workpiece holding device includes a double-output worm gear mechanism, an upper holding mechanism, and a lower holding mechanism. The double-output worm gear mechanism has a vertical worm shaft and an upper gear and a lower gear meshing with the worm shaft. The upper holding mechanism has an upper support screw mechanism, which includes a longitudinal upper support screw shaft and an upper support guide sleeve threaded with the upper support screw shaft. The front end of the upper support guide sleeve is connected to an upper support block for lateral workpiece holding. The upper gear is drivenly connected to the rear end of the upper support screw shaft. The lower holding mechanism includes a lower support screw mechanism and a lower support lever mechanism. The lower support screw mechanism includes a longitudinal lower support screw shaft and a lower support guide sleeve threaded with the lower support screw shaft. The lower support lever mechanism includes a lower support seat, the middle of which is rotatably connected to the workpiece holding device base frame. The lower support seat is inclined with a higher front end and a lower rear end. Its rear end is drivenly connected to the lower support guide sleeve, and its front end has a lower support block for supporting the workpiece from below.

2. The CNC grinding machine as described in claim 1, characterized in that... The upper gear and the lower gear may have the same or different number of teeth.

3. The CNC grinding machine as described in claim 1, characterized in that... The pitches of the upper support screw mechanism and the lower support screw mechanism may be the same or different.

4. The CNC grinding machine as described in any one of claims 1-3, characterized in that... An upper support fixed sleeve is fixedly installed on the base frame of the workpiece holding device. An upper support guide sleeve is sleeved inside the upper support fixed sleeve and slides with the upper support fixed sleeve. An upper support linear guide structure is provided between the upper support fixed sleeve and the upper support guide sleeve to limit the upper support guide sleeve to slide only in a straight line inside the upper support fixed sleeve.

5. The CNC grinding machine as described in any one of claims 1-3, characterized in that... The upper support seat is fixedly installed at the front end of the upper support guide sleeve; or, the upper support seat is threadedly connected to the upper support guide sleeve through an upper support fine-tuning sleeve sleeved on its outer side.

6. The CNC grinding machine as described in any one of claims 1-3, characterized in that... The front end face of the upper support block is flat.

7. The CNC grinding machine as described in any one of claims 1-3, characterized in that... A lower support fixed sleeve is fixedly installed on the base frame of the workpiece holding device. The lower support guide sleeve is sleeved inside the lower support fixed sleeve and slides with the lower support fixed sleeve. A lower support linear guide structure is provided between the lower support fixed sleeve and the lower support guide sleeve to limit the lower support guide sleeve to slide only in a straight line inside the lower support fixed sleeve.

8. The CNC grinding machine as described in claim 7, characterized in that... A top block is fixedly installed at the front end of the lower support guide sleeve. The front end of the top block is a smooth curved surface that abuts against the rear end face of the lower support seat. The rear end face of the lower support seat is a flat surface.

9. The CNC grinding machine as described in any one of claims 1-3, characterized in that... The forearm of the lower support is nearly horizontal; the rear arm of the lower support is nearly vertical.

10. The CNC grinding machine as described in any one of claims 1-3, characterized in that... The front end face of the lower support block is flat.

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