An apparatus for machining the outer surface of a mold guide pin

Abstract

The utility model relates to the technical field of mould manufacturing and precision mechanical machining, disclose a kind of outer surface processing device of mould guide rod, including lathe bed, the one end of lathe bed is provided with grinding mechanism, the upper fixed mounting of the other end of lathe bed is equipped with fixed frame, the upper end of fixed frame is equipped with three-jaw chuck, when using the device, by the closed-loop control system being made of elastic jacking rod, pressure sensor and first feed screw mechanism, the heat elongation problem in guide rod grinding is solved;System can monitor jacking force in real time, when heat stress is overproof, can automatically instruct first feed screw mechanism to micro-retreat, accurate release stress;Effectively prevent the defects such as workpiece bending, vibration or surface burn caused by traditional rigid jacking, fundamentally ensure the high shape accuracy and dimensional stability of long axis type parts in heavy load grinding, greatly improve product pass rate.

Description

Technical Field

[0001] This utility model relates to the field of mold manufacturing and precision machining technology, specifically to a device for machining the outer surface of a mold guide rod. Background Technology

[0002] In the mold manufacturing industry, the guide rod, as a core component of precision transmission, directly affects the mold closing accuracy and service life through the grinding precision of its outer cylindrical surface. Currently, most mold guide rod processing equipment on the market is modified from traditional cylindrical grinding machines. It generally adopts a fixed structure of "three-jaw chuck + rigid center", and controls the grinding wheel feed by manually adjusting the position of the support arm. The entire process of guide rod clamping, alignment and grinding is completed manually, and it is widely used in guide rod processing scenarios in the fields of automotive molds and precision stamping dies.

[0003] However, in terms of thermal deformation control, traditional equipment uses a rigid clamping structure. During the grinding process, when the guide rod elongates axially due to frictional heat, the clamping force continuously increases with the accumulation of thermal stress, leading to workpiece bending, vibration, or surface burns. In the clamping and positioning stage, existing equipment requires manual tapping or mechanical edge finder calibration, relying heavily on worker experience. Furthermore, initial bending or installation deviations can easily cause grinding eccentricity, severely affecting machining accuracy. Regarding flexibility, the clamping mechanism of traditional equipment is fixed in position. Changing guide rods of different lengths requires disassembling and reassembling the fixture, a cumbersome adjustment process that cannot meet the needs of multi-variety, small-batch production.

[0004] To address the aforementioned problems, this application proposes a device for machining the outer surface of a mold guide rod. Utility Model Content

[0005] The purpose of this utility model is to provide a device for processing the outer surface of a mold guide rod, so as to solve the problems mentioned in the background art, such as the inability to automatically compensate for thermal deformation, reliance on manual clamping and positioning, and insufficient flexible adaptability in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a mold guide rod outer surface processing device, including a bed, a grinding mechanism at one end of the bed, a fixed frame fixedly installed at the upper part of the other end of the bed, a three-jaw chuck installed at the upper end of the fixed frame, a sliding seat slidably installed at the upper part of the end of the bed away from the fixed frame, a moving frame installed at the upper end of the sliding seat, and a clamping mechanism fixedly installed at the upper end of the moving frame; the clamping mechanism is provided with a radial positioner, a top head, at least one pair of guide rods, an elastic top rod, and a first feed screw mechanism in sequence along its inner wall from the opening to the inside, and a pressure sensor is installed on the side of the top head facing the elastic top rod.

[0007] Preferably, the top head is coaxially arranged with the clamping mechanism. One end of the top head is fixedly connected to the boss on the inner wall of the clamping mechanism through at least one pair of guide rods, and the other end is fixedly connected to one end of the elastic push rod. The other end of the elastic push rod is connected to the output end of the first feed screw mechanism.

[0008] Preferably, the first feed screw mechanism includes: a servo motor, a screw connected to the output shaft of the servo motor, a nut threadedly engaged with the screw, and a push rod fixedly connected to the nut.

[0009] Preferably, there are multiple radial positioners, and each radial positioner is evenly distributed along the circumference of the clamping mechanism.

[0010] Preferably, the radial positioner includes a square sleeve fixedly installed on the inner wall of the tightening mechanism, a square guide rod slidably sleeved in the square sleeve, a compression spring disposed between the square sleeve and the square guide rod, and a guide wheel installed on the end of the square guide rod away from the square sleeve, wherein the axis of the guide wheel is parallel to the axis of the guide rod.

[0011] Preferably, the lower end of the movable frame is equipped with a T-shaped guide rail, the upper end of the sliding seat is provided with a T-shaped slide groove that matches the T-shaped guide rail, and one side of the movable frame is connected to the output end of the second feed screw mechanism that is fixedly installed on the upper end of the sliding seat.

[0012] Preferably, the grinding mechanism includes a grinding wheel and a support arm. The grinding wheel is rotatably mounted on one end of the support arm, and the outer shell of the grinding wheel is provided with multiple nozzles. The lower end of the support arm is sequentially connected to a vertical slide and a horizontal slide. The vertical slide is driven by a third feed screw mechanism to move vertically along the horizontal slide, and the horizontal slide is driven by a fourth feed screw mechanism to move laterally along the bed. Compared with the prior art, the beneficial effects of this utility model are: This invention solves the problem of thermal elongation in guide rod grinding through a closed-loop control system consisting of an elastic push rod, a pressure sensor, and a first feed screw mechanism. The system can monitor the clamping force in real time, and when the thermal stress exceeds the standard, it can automatically instruct the first feed screw mechanism to perform micro-retraction to accurately release the stress. It effectively eliminates defects such as workpiece bending, vibration, or surface burning caused by traditional rigid clamping, fundamentally ensuring high shape accuracy and dimensional stability of long shaft parts in heavy-duty grinding, and significantly improving the product qualification rate.

[0013] This invention employs a radially distributed spring-guide wheel adaptive structure in its radial positioner. When the guide rod is fed in, it automatically compensates for initial bending or installation deviations, precisely guiding the workpiece to a position coaxial with the mandrel and grinding center. This replaces the time-consuming and experience-dependent manual alignment step, significantly shortening the auxiliary time for workpiece clamping, reducing reliance on operator skill levels, and providing a crucial reference for subsequent uniform grinding and high-precision clamping, thus improving operational efficiency.

[0014] This invention, through the coordinated operation of the sliding seat, the second feed screw mechanism, and the clamping mechanism, allows for rapid and wide-range position adjustments, easily adapting to the clamping and processing needs of mold guide rods of different lengths. This flexible design significantly reduces adjustment time when changing product specifications, thereby improving equipment utilization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the outer surface processing device for a mold guide rod according to the present invention; Figure 2 This is a schematic diagram of the back structure of the outer surface processing device for a mold guide rod according to the present invention; Figure 3 This is a schematic diagram of the main structure of the movable frame in the outer surface processing device for a mold guide rod according to this utility model; Figure 4 This is a cross-sectional view of the clamping mechanism in the outer surface processing device for a mold guide rod according to this utility model; Figure 5 This is an enlarged view of A in the outer surface processing device for a mold guide rod according to this utility model; In the diagram: 1. Bed; 2. Grinding mechanism; 3. Fixed frame; 4. Three-jaw chuck; 5. Sliding seat; 6. Moving frame; 7. Tightening mechanism; 8. Radial positioner; 9. Mandrel; 10. Guide rod; 11. Elastic push rod; 12. First feed screw mechanism; 13. T-shaped guide rail; 14. Second feed screw mechanism; 15. Grinding wheel; 16. Support arm; 17. Nozzle; 18. Vertical slide; 19. Horizontal slide; 20. Third feed screw mechanism; 21. Fourth feed screw mechanism; 81. Square sleeve; 82. Square guide rod; 83. Compression spring; 84. Guide wheel. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Please see Figures 1-5This utility model provides a technical solution: a device for processing the outer surface of a mold guide rod, including a bed 1, a grinding mechanism 2 at one end of the bed 1, a fixed frame 3 fixedly mounted on the upper part of the other end of the bed 1, a three-jaw chuck 4 mounted on the upper end of the fixed frame 3, a sliding seat 5 slidably mounted on the upper part of the end of the bed 1 away from the fixed frame 3, a movable frame 6 mounted on the upper end of the sliding seat 5, and a clamping mechanism 7 fixedly mounted on the upper end of the movable frame 6; the clamping mechanism 7 has a radial positioner 8, a top head 9, at least one pair of guide rods 10, an elastic top rod 11, and a first feed screw mechanism 12 arranged sequentially along its inner wall from the opening to the inside; a pressure sensor is mounted on the side of the top head 9 facing the elastic top rod 11. The bed 1 provides a rigid support foundation for the entire device. The fixed frame 3 and the three-jaw chuck 4 on it are used to clamp and rotate the mold guide rod workpiece. The sliding seat 5 can move along the bed 1, and the initial position of the clamping mechanism 7 can be adjusted by the movable frame 6 to accommodate guide rods of different lengths. The clamping mechanism 7 is used to position and clamp the end of the guide rod: the radial positioner 8 first radially straightens the guide rod; the first feed screw mechanism 12 drives the mandrel 9 to move precisely along the guide rod 10 by pushing the elastic push rod 11, thus completing the clamping. During the machining process, the heat generated by grinding will cause the guide rod to elongate axially. At this time, the elastic push rod 11 undergoes elastic deformation to absorb the interference and provide buffering; at the same time, the pressure sensor monitors the change of clamping force in real time. When the pressure exceeds the safety threshold, the control system starts the first feed screw mechanism 12 to make a slight position adjustment, automatically compensates for thermal deformation, and forms a dynamic "detection-buffering-feedback-adjustment" closed-loop control system.

[0018] The mandrel 9 is coaxially arranged with the clamping mechanism 7. One end of the mandrel 9 is fixedly connected to the boss on the inner wall of the clamping mechanism 7 via at least one pair of guide rods 10, and the other end is fixedly connected to one end of the elastic push rod 11. The other end of the elastic push rod 11 is connected to the output end of the first feed screw mechanism 12. The at least one pair of guide rods 10 constitutes a high-precision sliding pair, which strictly limits the mandrel 9 to moving only along the axial direction of the clamping mechanism 7, effectively preventing skewing or jamming during the clamping process. The elastic push rod 11 connects the mandrel 9 and the push rod of the first feed screw mechanism 12, and plays a triple role: transmitting the clamping force; absorbing the thermal expansion of the guide rod through its own elastic deformation; and effectively transmitting the pressure change on the mandrel 9 to the pressure sensor.

[0019] The first feed screw mechanism 12 includes: a servo motor, a screw connected to the output shaft of the servo motor, a nut threaded with the screw, and a push rod fixedly connected to the nut. This mechanism converts the rotational motion of the servo motor into precise linear motion. The servo motor provides a controllable power source, and its rotational accuracy determines the position control accuracy. The screw and nut form a precision transmission pair with high transmission rigidity and self-locking properties, capable of accurately converting rotational angles into linear displacement and maintaining them in any position without slippage. The push rod fixedly connected to the nut serves as the power output end, directly pushing the elastic push rod 11. This structure enables precise setting of the clamping force and micron-level displacement compensation control, making it a key actuator for achieving automated pressure regulation.

[0020] Multiple radial positioners 8 are provided, and each radial positioner 8 is evenly distributed along the circumference of the clamping mechanism 7. The multiple circumferentially evenly distributed radial positioners 8 together constitute an "adaptive positioning system" that can automatically center and correct guide rods of different diameters and with initial bending, ensuring that the axis of the guide rod coincides with the axis of the clamping mechanism 7, laying the foundation for subsequent high-precision clamping and grinding.

[0021] The radial positioner 8 includes a square sleeve 81 fixedly installed on the inner wall of the clamping mechanism 7, a square guide rod 82 slidably sleeved within the square sleeve 81, a compression spring 83 disposed between the square sleeve 81 and the square guide rod 82, and a guide wheel 84 installed at the end of the square guide rod 82 away from the square sleeve 81, the axis of the guide wheel 84 being parallel to the axis of the guide rod 10. When the guide rod is inserted, its outer wall contacts the guide wheel 84. If the guide rod has initial bending or misalignment, it will compress the corresponding guide wheel 84, forcing the square guide rod 82 to retract into the square sleeve 81 against the force of the compression spring 83. The square cross-section effectively prevents the square guide rod 82 from rotating on its own, ensuring that the guide wheel 84 is always in the correct direction. Under the restoring force of the compression spring 83, multiple positioners work together to automatically correct the guide rod to the center position coaxial with the top head 9. The design of the guide wheel 84 greatly reduces friction with the surface of the guide rod.

[0022] A T-shaped guide rail 13 is installed at the lower end of the movable frame 6, and a T-shaped groove adapted to the T-shaped guide rail 13 is provided at the upper end of the sliding seat 5. One side of the movable frame 6 is connected to the output end of the second feed screw mechanism 14, which is fixedly installed on the upper end of the sliding seat 5. The cooperation between the T-shaped guide rail 13 and the T-shaped groove forms a high-rigidity, anti-tipping sliding pair, ensuring that the movable frame 6 and the clamping mechanism 7 can only move smoothly along a precise straight trajectory and can withstand the axial reaction force generated during clamping. The second feed screw mechanism 14 is used to drive the entire clamping mechanism 7 to move over a wide range and quickly adjust to adapt to workpieces of different lengths, improving the adjustment efficiency of the equipment.

[0023] The grinding mechanism 2 includes a grinding wheel 15 and a support arm 16. The grinding wheel 15 is rotatably mounted on one end of the support arm 16, and multiple nozzles 17 are provided on the outer shell of the grinding wheel 15. A vertical slide 18 and a horizontal slide 19 are sequentially connected to the lower end of the support arm 16. The vertical slide 18 is driven by a third feed screw mechanism 20 to move vertically along the horizontal slide 19, and the horizontal slide 19 is driven by a fourth feed screw mechanism 21 to move laterally along the bed 1. The grinding wheel 15 rotates at high speed to perform the grinding operation. The nozzles 17 spray coolant into the grinding area, serving to cool, lubricate, and clean. The support arm 16 and the slide assembly below it constitute the precision moving platform of the grinding mechanism 2. The third feed screw mechanism 20 drives the vertical slide 18 to control the depth of cut (Z-axis feed) of the grinding wheel 15, thus precisely controlling the grinding amount. The fourth feed screw mechanism 21 drives the horizontal slide 19 to realize the longitudinal feed motion of the grinding wheel 15 along the axis of the guide rod (X-axis feed), thereby completing the grinding of the entire length of the guide rod. The cooperation of two high-precision feed screw mechanisms can realize complex grinding trajectories and precise dimensional control.

[0024] Working principle: When using the outer surface machining device for the mold guide rod, the operator first inserts one end of the mold guide rod to be machined into the three-jaw chuck 4 on the fixed frame 3 and clamps it. Then, the other end of the guide rod is inserted into the clamping mechanism 7, which has been adjusted to the position according to the length of the guide rod by the second feed screw mechanism 14. During the insertion process, the guide rod will first contact the guide wheels 84 of the multiple circumferentially distributed radial positioners 8, and be automatically aligned and centered under the action of the compression spring 83. Subsequently, the first feed screw mechanism 12 is activated, pushing the elastic push rod 11 and the push head 9 through the push rod, moving them precisely along the guide rod 10 until the guide rod is clamped. At this time, the pressure sensor begins to monitor the clamping force in real time. The grinding mechanism 2 is activated, and the grinding wheel 15 rotates at high speed. At the same time, the third feed screw mechanism 20 and the fourth feed screw mechanism 21 drive the grinding wheel 15 to perform vertical and horizontal feed movements, performing fully automatic grinding on the outer circle of the rotating guide rod. The heat generated by grinding causes the guide rod to expand axially, resulting in an increase in its internal stress and a rise in the clamping force. This device automatically addresses this problem through a closed-loop control system of "detection-buffering-feedback-adjustment": the elastic push rod 11 first undergoes elastic deformation to absorb the initial expansion and provide mechanical buffering; when the pressure sensor detects that the clamping force continuously exceeds the safety threshold, the control system immediately instructs the servo motor of the first feed screw mechanism 12 to slightly reverse, driving the screw nut pair to move the push rod back a short distance, thereby precisely releasing the excessive preload, compensating for the thermal expansion of the guide rod, effectively preventing workpiece bending, vibration, or equipment overload, and ensuring the continuous and stable operation of high-precision grinding. This process is applicable to guide rods of different lengths, and through the coarse adjustment of the sliding seat 5 and the fine adjustment of the clamping mechanism 7, it can quickly adapt to the processing requirements of workpieces of various specifications.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A device for machining the outer surface of a mold guide rod, comprising a bed (1), characterized in that: A grinding mechanism (2) is provided at one end of the bed (1), and a fixed frame (3) is fixedly installed on the upper part of the other end of the bed (1). A three-jaw chuck (4) is installed on the upper end of the fixed frame (3). A sliding seat (5) is slidably installed on the upper part of the bed (1) away from the fixed frame (3). A moving frame (6) is installed on the upper end of the sliding seat (5). A clamping mechanism (7) is fixedly installed on the upper end of the moving frame (6). The clamping mechanism (7) is provided with a radial positioner (8), a top head (9), at least one pair of guide rods (10), an elastic top rod (11), and a first feed screw mechanism (12) in sequence along its inner wall from the opening to the inside. A pressure sensor is installed on the side of the top head (9) facing the elastic top rod (11).

2. The outer surface processing device for a mold guide rod according to claim 1, characterized in that: The top head (9) is coaxially arranged with the clamping mechanism (7). One end of the top head (9) is fixedly connected to the boss on the inner wall of the clamping mechanism (7) through at least one pair of guide rods (10), and the other end is fixedly connected to one end of the elastic top rod (11). The other end of the elastic top rod (11) is connected to the output end of the first feed screw mechanism (12).

3. The outer surface processing device for a mold guide rod according to claim 2, characterized in that: The first feed screw mechanism (12) includes: a servo motor, a screw connected to the output shaft of the servo motor, a nut threadedly engaged with the screw, and a push rod fixedly connected to the nut.

4. The outer surface processing device for a mold guide rod according to claim 1, characterized in that: The radial positioner (8) is provided in multiple ways, and each radial positioner (8) is evenly distributed along the circumference of the clamping mechanism (7).

5. The outer surface processing device for a mold guide rod according to claim 4, characterized in that: The radial positioner (8) includes a square sleeve (81) fixedly installed on the inner wall of the clamping mechanism (7), a square guide rod (82) slidably sleeved in the square sleeve (81), a compression spring (83) disposed between the square sleeve (81) and the square guide rod (82), and a guide wheel (84) installed on the end of the square guide rod (82) away from the square sleeve (81), the axis of the guide wheel (84) being parallel to the axis of the guide rod (10).

6. The outer surface processing device for a mold guide rod according to claim 1, characterized in that: The lower end of the movable frame (6) is equipped with a T-shaped guide rail (13), and the upper end of the sliding seat (5) is provided with a T-shaped slide groove that is adapted to the T-shaped guide rail (13). One side of the movable frame (6) is connected to the output end of the second feed screw mechanism (14) which is fixedly installed on the upper end of the sliding seat (5).

7. The apparatus according to claim 1, characterized in that: The grinding mechanism (2) includes a grinding wheel (15) and a support arm (16). The grinding wheel (15) is rotatably mounted on one end of the support arm (16). The outer shell of the grinding wheel (15) is provided with multiple nozzles (17). The lower end of the support arm (16) is connected to a vertical slide (18) and a horizontal slide (19) in sequence. The vertical slide (18) is driven by a third feed screw mechanism (20) to move vertically along the horizontal slide (19). The horizontal slide (19) is driven by a fourth feed screw mechanism (21) to move laterally along the bed (1).

Images