cylindrical grinder

Abstract

The utility model relates to the technical field of grinding machine, especially relates to the cylindrical grinding machine, including the workstation, the workstation is connected with the grinding seat frame of sliding, the rotatable fixed grinding wheel is connected in the grinding seat frame, the upper end surface of workstation is connected with workpiece headstock and workpiece tailstock of sliding, still include the centre, the centre is fixedly connected respectively on workpiece headstock and workpiece tailstock, the centre includes fixed ball, the fixed ball inner wall is connected with pressure sensor, the fixed ring is connected on the fixed ball, the movable link is connected with the fixed ring of sliding, in the utility model, through fixed spring and pressure sensor cooperation, the centre force of each clamping is consistent, so that the operator of novice need not to pass through long time to feel to grasp the feeling, only need to workpiece top into, until seeing the trigger signal of pressure sensor, thereby eliminates the variable because the operator is different or state is different, realizes the standardization of clamping process.

Description

Technical Field

[0001] This utility model relates to the field of grinding technology, and in particular to cylindrical grinding machines. Background Technology

[0002] As the core equipment for precision machining of shaft parts, the external cylindrical grinding machine plays a crucial role in ensuring machining accuracy and production safety during the external cylindrical grinding process. Among these aspects, the control of the tailstock clamping force is particularly important. Currently, in the workpiece clamping process of mainstream external cylindrical grinding machines, the adjustment of the tailstock clamping force mainly relies on the operator's manual operation and experience judgment: the operator drives the center forward by rotating the tailstock handwheel until the center subjectively feels that it is in contact with the center hole of the workpiece and reaches a suitable clamping state, and then stops the operation.

[0003] However, this adjustment method, which relies on manual experience, lacks quantifiable force control standards and precise control methods. It is prone to problems due to improper control of the clamping force. When the clamping force is too small, the contact pressure between the center point and the workpiece center hole is insufficient, and a stable positioning constraint cannot be formed. During the grinding process, the workpiece is prone to axial movement or radial wobble due to the cutting force of the grinding wheel and centrifugal force, causing the rotation trajectory to deviate from the reference axis. This not only causes the workpiece's outer circle cylindricity, roundness, and other dimensional and positional tolerances to exceed the tolerances, but more seriously, if the fit constraint between the workpiece and the center point completely fails, the high-speed rotating workpiece may disengage from the chuck and the center point, causing a "runaway" safety accident, which poses a significant threat to the safety of equipment, tooling, and operators. When the clamping force is too large, the excessive contact pressure will cause plastic deformation and severe frictional wear on the surface of the center point and the workpiece center hole. Therefore, this application aims to solve the problem that traditional manual center point force adjustment lacks quantifiable standards, and that insufficient force easily leads to workpiece displacement, dimensional and positional tolerances, or even "runaway," while excessive force causes deformation and wear, all of which endanger safety and quality. Therefore, an external cylindrical grinding machine is proposed. Utility Model Content

[0004] To overcome the lack of quantitative standards in traditional manual adjustment of center force, which easily leads to problems due to improper tightening force, when the tightening force is too small, the workpiece is prone to displacement or vibration, resulting in out-of-tolerance form and position tolerances. In severe cases, it may cause "runaway" accidents, threatening personal and equipment safety. When the tightening force is too large, it is easy to cause deformation and wear of the center and center hole.

[0005] The technical solution of this utility model is: an external cylindrical grinding machine, including a worktable, a grinding base frame slidably connected to the worktable, a rotatable fixed grinding wheel connected inside the grinding base frame, a workpiece headstock and a workpiece tailstock slidably connected to the upper end face of the worktable, and also including a center assembly, the center assembly being fixedly connected to the workpiece headstock and the workpiece tailstock respectively. The top component includes a fixed ball, a pressure sensor connected to the inner wall of the fixed ball, a fixed ring connected to the fixed ball, a movable rod slidably connected to the fixed ring, a pressure ball connected to the movable rod, a fixed spring sleeved on the outer side of the movable rod, the two ends of the fixed spring abutting against the fixed ring and the pressure ball respectively, and a limit ring connected to the fixed ball, the limit ring fitting against the pressure ball.

[0006] Preferably, a connecting rod is connected to one end face of the fixed ball, a movable ball is connected to the connecting rod, a rotating cover is provided on the outside of the movable ball, the movable ball is rotatably housed in the rotating cover, and an adjustment groove is provided on the rotating cover for the movable ball to move.

[0007] Preferably, a connecting seat is fitted on the outer side of the rotating cover, a connecting rod plate is connected to one end face of the connecting seat, a hydraulic push rod is connected to the connecting rod plate, a locking block is connected to the hydraulic push rod, and a time relay is connected to the connecting seat. The time relay is used to control the working sequence of the hydraulic push rod.

[0008] Preferably, a connecting rod is connected to the side of the connecting seat away from the connecting rod piece, and a fitting cover is provided on one side of the connecting rod. A fixing seat is connected to the outer surface of the fitting cover.

[0009] Preferably, the workpiece headstock is provided with a first main shaft that can rotate around its own central axis, and a lever is connected to the first main shaft.

[0010] Preferably, the workpiece tailstock is provided with a second main shaft that can rotate around its own central axis, and a rotating rod is connected to the upper end of the workpiece tailstock. Rotating the rotating rod can drive the center assembly on the workpiece tailstock to move along the central axis of the second main shaft.

[0011] Preferably, a drive motor is connected to the inner wall of the grinding base, a first synchronous pulley is connected to the output shaft of the drive motor, a second synchronous pulley concentric with the fixed grinding wheel is connected to the fixed grinding wheel, and a synchronous belt is fitted on the outer surface of the first synchronous pulley and the second synchronous pulley.

[0012] The beneficial effects of this utility model are: 1. This utility model uses a fixed spring and a pressure sensor to work together to ensure that the clamping force is consistent each time, so that novice operators do not need to spend a long time figuring it out to master the feel. They only need to push the workpiece in until they see the trigger signal of the pressure sensor, thereby eliminating the variables caused by different operators or different conditions and realizing the standardization of the clamping process. 2. By driving the movable ball to slide in the adjustment groove, the connecting rod connected to the movable ball drives the fixed ball to rotate inside the fitting cover, thereby adjusting the position of the pressure ball to achieve the adjustment and processing of irregular workpieces. Attached Figure Description

[0013] Figure 1 The diagram shown is a three-dimensional structural schematic of the cylindrical grinding machine of this utility model; Figure 2 The diagram shows a three-dimensional structure of the fixed grinding wheel of the cylindrical grinding machine of this utility model. Figure 3 The diagram shown is a three-dimensional structural schematic of the time relay of the external cylindrical grinding machine of this utility model; Figure 4 The diagram shown is a cross-sectional view of the fixed ball of the cylindrical grinding machine of this utility model.

[0014] Explanation of reference numerals in the attached drawings: 1. Worktable; 201. Grinding base frame; 202. Drive motor; 203. First synchronous pulley; 204. Synchronous belt; 205. Second synchronous pulley; 206. Fixed grinding wheel; 301. Workpiece headstock; 302. First spindle; 303. Lever; 401. Workpiece tailstock; 402. Second spindle; 403. Rotating rod; 501. Fixed seat; 502. Fitting cover; 503. Connecting rod; 504. Connecting seat; 505. Connecting rod plate; 506. Hydraulic push rod; 507. Locking block; 508. Time relay; 601. Rotating cover; 602. Adjustment groove; 603. Movable ball; 604. Connecting ball rod; 605. Fixed ball; 606. Pressure sensor; 607. Fixed ring; 608. Movable rod; 609. Fixed spring; 610. Pressing ball; 611. Limiting ring. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] refer to Figures 1-4 The structure shown is an external cylindrical grinding machine, including a worktable 1, a grinding base 201 slidably connected on the worktable 1, a rotatable fixed grinding wheel 206 connected inside the grinding base 201, a workpiece headstock 301 and a workpiece tailstock 401 slidably connected on the upper end face of the worktable 1, and also includes a center assembly, which is fixedly connected to the workpiece headstock 301 and the workpiece tailstock 401 respectively. The top component includes a fixed ball 605, a pressure sensor 606 connected to the inner wall of the fixed ball 605, a fixed ring 607 connected to the fixed ball 605, a movable rod 608 slidably connected to the fixed ring 607, a pressure ball 610 connected to the movable rod 608, a fixed spring 609 sleeved on the outer side of the movable rod 608, the two ends of the fixed spring 609 abutting against the fixed ring 607 and the pressure ball 610 respectively, and a limit ring 611 connected to the fixed ball 605, the limit ring 611 fitting against the pressure ball 610.

[0017] Among them, the pressure sensor 606 is generally used in conjunction with a miniature force sensor of model HBM U9B; By using the fixed spring 609 in conjunction with the pressure sensor 606, the clamping force is consistent for each clamping operation. This eliminates the need for novice operators to spend a long time figuring out how to use the tool. They can simply push the workpiece in until they see the trigger signal from the pressure sensor 606, thus eliminating the variables caused by different operators or different conditions and standardizing the clamping process.

[0018] Furthermore, a connecting rod 604 is connected to one end face of the fixed ball 605, and a movable ball 603 is connected to the connecting rod 604. A rotating cover 601 is provided on the outside of the movable ball 603, and the movable ball 603 is rotatably housed in the rotating cover 601. An adjustment groove 602 for the movable ball 603 to move is provided on the rotating cover 601.

[0019] Specifically, by driving the movable ball 603 to slide in the adjustment groove 602, the connecting rod 604 connected to the movable ball 603 drives the fixed ball 605 to rotate inside the fitting cover 502, thereby allowing the position of the pressing ball 610 to be adjusted to achieve the adjustment processing of irregular workpieces.

[0020] Furthermore, a connecting seat 504 is sleeved on the outer side of the rotating cover 601. A connecting rod plate 505 is connected to one end face of the connecting seat 504. A hydraulic push rod 506 is connected to the connecting rod plate 505. A locking block 507 is connected to the hydraulic push rod 506. A time relay 508 is connected to the connecting seat 504. The time relay 508 is used to control the working sequence of the hydraulic push rod 506.

[0021] The hydraulic push rod 506 drives the locking block 507 to move, thereby clamping the rotating cover 601 through the moving locking block 507.

[0022] Furthermore, a connecting rod 503 is connected to the side of the connecting seat 504 away from the connecting rod piece 505, and a fitting cover 502 is provided on one side of the connecting rod 503. A fixing seat 501 is connected to the outer surface of the fitting cover 502.

[0023] Furthermore, the workpiece headstock 301 is provided with a first spindle 302 that can rotate around its own central axis, and a lever 303 is connected to the first spindle 302.

[0024] The first spindle 302 and the top tip assembly are configured to be rotatably connected.

[0025] Furthermore, the workpiece tailstock 401 is provided with a second main shaft 402 that can rotate around its own central axis. The upper end of the workpiece tailstock 401 is connected to a rotating rod 403. Rotating the rotating rod 403 can drive the tip assembly on the workpiece tailstock 401 to move along the central axis of the second main shaft 402.

[0026] The workpiece tailstock 401 contains a lead screw, a nut, a tailstock sleeve, and a locking handle. The tailstock sleeve is a hollow precision tube with a center mounted at its front end and a precision sliding fit with the tailstock body. The lead screw's front end is threaded to the rear end of the sleeve, thus pushing the sleeve. The nut is fixed within the workpiece tailstock 401 and does not move. The locking handle is an eccentric cam used to press and fix the outer circle of the tailstock sleeve. When the rotating rod 403 is rotated, the rotation of the rotating rod 403 drives the lead screw to rotate synchronously. The lead screw engages with a nut fixed within the rear end of the workpiece tailstock. Since this nut is fixed and cannot move forward or backward, according to the principle of a screw pair, the rotating lead screw is forced to produce a linear forward or backward motion while rotating. The front end of the lead screw is fixed to the tailstock sleeve. Therefore, the linear motion of the lead screw directly pushes the entire sleeve and the center assembly mounted at the front end of the sleeve forward or backward in a straight line.

[0027] Furthermore, a drive motor 202 is connected to the inner wall of the grinding base 201, a first synchronous pulley 203 is connected to the output shaft of the drive motor 202, a second synchronous pulley 205 concentric with the fixed grinding wheel 206 is connected to the fixed grinding wheel 206, and a synchronous belt 204 is sleeved on the outer surface of the first synchronous pulley 203 and the second synchronous pulley 205.

[0028] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An external cylindrical grinding machine, comprising a worktable (1), on which a grinding base (201) is slidably connected, and a rotatable fixed grinding wheel (206) is connected inside the grinding base (201), and a workpiece headstock (301) and a workpiece tailstock (401) are slidably connected to the upper end face of the worktable (1), characterized in that: It also includes a center assembly, which is fixedly connected to the workpiece headstock (301) and the workpiece tailstock (401) respectively; The top component includes a fixed ball (605), a pressure sensor (606) connected to the inner wall of the fixed ball (605), a fixed ring (607) connected to the fixed ball (605), a movable rod (608) slidably connected to the fixed ring (607), a pressure ball (610) connected to the movable rod (608), a fixed spring (609) sleeved on the outer side of the movable rod (608), the two ends of the fixed spring (609) abutting against the fixed ring (607) and the pressure ball (610) respectively, and a limiting ring (611) connected to the fixed ball (605), the limiting ring (611) fitting against the pressure ball (610).

2. The external cylindrical grinding machine according to claim 1, characterized in that: A connecting rod (604) is connected to one end face of the fixed ball (605), and a movable ball (603) is connected to the connecting rod (604). A rotating cover (601) is provided on the outside of the movable ball (603), and the movable ball (603) is rotatably housed in the rotating cover (601). An adjustment groove (602) for the movable ball (603) to move is provided on the rotating cover (601).

3. The external cylindrical grinding machine according to claim 2, characterized in that: A connecting seat (504) is sleeved on the outer side of the rotating cover (601). A connecting rod plate (505) is connected to one end face of the connecting seat (504). A hydraulic push rod (506) is connected to the connecting rod plate (505). A locking block (507) is connected to the hydraulic push rod (506). A time relay (508) is connected to the connecting seat (504). The time relay (508) is used to control the working sequence of the hydraulic push rod (506).

4. The cylindrical grinding machine according to claim 3, characterized in that: The connecting seat (504) is connected to a connecting rod (503) on the side away from the connecting rod piece (505). A fitting cover (502) is provided on one side of the connecting rod (503). A fixing seat (501) is connected to the outer surface of the fitting cover (502).

5. The cylindrical grinding machine according to claim 1, characterized in that: The workpiece headstock (301) is provided with a first spindle (302) that can rotate around its own central axis, and a lever (303) is connected to the first spindle (302).

6. The external cylindrical grinding machine according to claim 1, characterized in that: The workpiece tailstock (401) is provided with a second spindle (402) that can rotate around its own central axis. The upper end of the workpiece tailstock (401) is connected to a rotating rod (403). Rotating the rotating rod (403) can drive the center assembly on the workpiece tailstock (401) to move along the central axis of the second spindle (402).

7. The cylindrical grinding machine according to claim 1, characterized in that: A drive motor (202) is connected to the inner wall of the grinding base (201). A first synchronous wheel (203) is connected to the output shaft of the drive motor (202). A second synchronous wheel (205) is connected to the fixed grinding wheel (206) and is concentric with it. A synchronous belt (204) is fitted on the outer surfaces of the first synchronous wheel (203) and the second synchronous wheel (205).

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