Small special numerical control thread grinder

Abstract

The invention discloses a small special numerical control thread grinding machine, belongs to the grinding machine technology, and aims to solve the problems that the existing thread grinding machine grinds a single grinding wheel every time, is low in efficiency and is not suitable for large-batch small screw machining. The first grinding wheel and the second grinding wheel are arranged on the two radial sides of the part, and the first grinding wheel and the second grinding wheel can conduct rough grinding and fine grinding at the same time; the axial leads of the grinding dressing wheel, the part and the power head for driving the part to rotate are parallel and are arranged on a longitudinal carriage between the first grinding wheel and the second grinding wheel, and the longitudinal carriage can drive the part, the dressing wheel and the like to axially move back and forth; the first grinding wheel and the second grinding wheel are arranged on the first transverse carriage and the second transverse carriage respectively and can transversely move left and right on the two radial sides of the part. Through numerical control grinding linkage and finishing linkage of the machine tool, precise grinding and efficient grinding of the small screw are achieved.

Description

Technical Field

[0001] The invention belongs to the field of grinding machine technology, and in particular relates to a multi-axis linkage small-sized special numerically controlled thread grinding machine for grinding micro-sized shaft-type external thread parts. Background Art

[0002] The existing external thread grinders use the same grinding wheel to grind both rough and fine grinding of parts. If the rough grinding efficiency is given priority, the accuracy and surface quality of the final parts will be lost; if the accuracy and surface quality of the parts are given priority, the processing efficiency will be lost; if the rough grinding and fine grinding are divided into steps to achieve a comprehensive effect, in actual operation, it is difficult to align the tool for the thread profiles in different steps, or even scrap it. Therefore, the existing grinding efficiency of micro-shaft external thread parts is low and is not suitable for industrial mass production. Summary of the invention

[0003] The technical problem to be solved and the technical task proposed by the present invention is to overcome the dilemma that the existing external thread grinders have low grinding efficiency and are not suitable for industrial mass production, and to provide a small special CNC thread grinder suitable for grinding small parts, so that the parts have higher processing accuracy and better surface morphology, and to improve production efficiency and reduce manufacturing costs.

[0004] To achieve the above object, the small special CNC thread grinding machine of the present invention comprises:

[0005] A longitudinal carriage that can be driven by a third driver to move longitudinally forward and backward is provided on the longitudinal carriage with a power head system for clamping one end of a part and driving the part to rotate, a support system for clamping the other end of the part, and a dressing wheel system for dressing the grinding wheel. The rotation axis of the power head system is coaxial with the axis of the part and is parallel to the rotation axis of the dressing wheel system and the moving direction of the longitudinal carriage.

[0006] A first grinding wheel and a second grinding wheel are arranged on both sides of the part in a radial direction. The first grinding wheel is coaxially arranged on the first main shaft and can be moved horizontally left and right by a first transverse carriage under the drive of a first driver. The second grinding wheel is coaxially arranged on the second main shaft and can be moved horizontally left and right by a second transverse carriage under the drive of a second driver.

[0007] An electrical program control system controls the rotation of the first spindle, the second spindle, the power head system, the dressing wheel system, and the movement of the first transverse carriage, the second transverse carriage, and the longitudinal carriage to dress the grinding wheel and process parts;

[0008] The rotation of the part driven by the power head system and the longitudinal forward and backward movement driven by the third driver are numerically linked and can be processed by the first grinding wheel and the second grinding wheel at the same time.

[0009] Accordingly, the first grinding wheel and the second grinding wheel can simultaneously perform rough grinding and fine grinding on the parts, taking into account the accuracy, surface quality and efficiency of the parts. The difficulty of tool setting and even the defect of scrapping of thread profiles in different working steps are overcome, so that the parts have higher processing accuracy and better surface morphology, and the production efficiency is improved, and the manufacturing cost is reduced.

[0010] Preferably, the first spindle is arranged on the first spindle seat, the first spindle seat is directly or indirectly arranged on the first transverse carriage, the first transverse carriage is arranged on one side of the bed; the second spindle is arranged on the second spindle seat, the second spindle seat is directly or indirectly arranged on the second transverse carriage, the second transverse carriage is arranged on the other side of the bed; the longitudinal carriage is arranged in the middle position of the left and right directions of the bed and is located between the first transverse carriage and the second transverse carriage. With this structure, the entire thread grinder is roughly bilaterally symmetrical, with a reasonable layout, and is suitable for precise and efficient processing of micro-shaft external threaded parts.

[0011] Preferably, the first spindle seat is directly or indirectly arranged on the first composite component with a rotatable first support shaft, the axis of the first support shaft is perpendicular to the axis of the part, the first support shaft is directly or indirectly arranged on the first bracket, and the first bracket is directly or indirectly arranged on the first transverse carriage; the first support shaft can rotate the first grinding wheel around the axis of the first support shaft to adjust the posture of the first grinding wheel. Accordingly, the posture of the first grinding wheel can be adjusted as needed, and the micro-shaft external threaded parts with different leads and different guide angles can be matched during processing to achieve precision processing.

[0012] Preferably, the axis of the first support shaft intersects the first grinding wheel at the center of the outer circle geometric profile of the first grinding wheel, thereby ensuring that the posture of the first grinding wheel can be accurately adjusted by the rotation of the first support shaft to ensure the quality of processing.

[0013] Preferably, the second spindle seat is directly or indirectly constructed on a second composite component having a rotatable second support shaft, the axis of the second support shaft is perpendicular to the axis of the part, the second support shaft is directly or indirectly constructed on a second bracket, and the second bracket is directly or indirectly constructed on a second transverse carriage; the second support shaft can rotate the second grinding wheel around the axis of the second support shaft to adjust the posture of the second grinding wheel. Accordingly, the posture of the second grinding wheel can be adjusted as needed, and micro-shaft external threaded parts with different leads and different guide angles can be matched during processing to achieve precision processing.

[0014] Preferably, the axis of the second support shaft intersects the second grinding wheel at the center of the outer circle geometric profile of the second grinding wheel, thereby ensuring that the posture of the first grinding wheel can be accurately adjusted by the rotation of the first support shaft to ensure the quality of processing.

[0015] Preferably, the first bracket and / or the second bracket are frame components or box components, and the first bracket and / or the second bracket are endowed with sufficient structural performance to play the role of positioning and supporting the first support shaft and / or the second support shaft.

[0016] Preferably, the longitudinal carriage is composed of an upper carriage and a lower carriage stacked together, and the upper carriage can rotate slightly relative to the lower carriage around the rotation axis and be locked; the power head system, support system and dressing wheel system are arranged on the upper carriage and arranged in the front and rear in the longitudinal direction. Accordingly, the size difference (similar to taper) of the parts in the entire axial length can be fine-tuned as needed to ensure processing accuracy.

[0017] Preferably, the power head system includes a driving actuator with a central through hole that can drive the part to rotate, a front center system that passes through the central through hole of the driving actuator and is directly or indirectly fixed to the longitudinal carriage, and a clamp installed at the front end of the driving actuator for clamping the part. This structure separates the function of minimizing the positioning error of the part in the power head system and the function of refining the rotation accuracy, thereby maximizing the processing accuracy.

[0018] Preferably, the dressing wheel system comprises at least one set of dressing wheels and a dressing electric spindle, the dressing wheel is coaxially mounted on the dressing electric spindle, and the dressing electric spindle is directly or indirectly mounted on the longitudinal carriage through a dressing wheel seat. Accordingly, the dressing electric spindle carries the dressing wheel to perform precise dressing on the first grinding wheel and / or the second grinding wheel.

[0019] Preferably, the dressing wheel system comprises two groups of bilaterally symmetrical dressing wheels and dressing electric spindles, and the first grinding wheel and the second grinding wheel are each dressed by a dressing wheel. Accordingly, different dressing wheels can be configured according to the different division of labor of the first grinding wheel and the second grinding wheel, thereby improving the efficiency and accuracy of dressing.

[0020] The present invention configures the first grinding wheel and the second grinding wheel on both radial sides of the part, so that the first grinding wheel and the second grinding wheel can simultaneously perform rough grinding and fine grinding on the part in sequence, taking into account the accuracy, surface quality and efficiency of the part. It overcomes the difficulty of tool alignment and even the defect of scrapping of thread profiles in different working steps, so that the part has higher processing accuracy and better surface morphology, and improves production efficiency and reduces manufacturing costs.

[0021] The present invention realizes the clamping of parts, axial feeding and the dressing of the first grinding wheel and the second grinding wheel by jointly constructing the power head system, the support system and the dressing wheel system on the longitudinal carriage; during grinding, the first grinding wheel and the second grinding wheel can process the parts at the same time. The design has a compact structure, high efficiency and good precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is an isometric view of the small special CNC thread grinding machine of the present invention;

[0023] Figure 2 It is an isometric view of the power head system, the support system and the dressing wheel system of the present invention being jointly constructed on a longitudinal carriage;

[0024] Figure 3 for Figure 2 an axonometric view of another perspective of the structure shown;

[0025] Figure 4 for Figure 2-3 A schematic diagram of an orthographic projection of the structure shown from left to right;

[0026] Figure 5 for Figure 4 Left view of

[0027] Figure 6 is an isometric view of a first grinding wheel of the present invention disposed on a first composite component;

[0028] Figure 7 is an isometric view of a second grinding wheel of the present invention disposed on a second composite component;

[0029] Figure 8 It is a schematic diagram of the positional relationship between the first grinding wheel, the second grinding wheel and the part in a top view of the present invention;

[0030] Explanation of reference numerals in the figure: 1 part, 101 axis of part, 2 first grinding wheel, 3 first spindle, 4 first spindle seat, 5 first transverse slide, 6 bed, 7 first drive, 8 second grinding wheel, 9 second spindle, 10 second spindle seat, 11 second transverse slide, 12 second drive, 13 longitudinal slide, 131 upper slide, 132 lower slide, 14 third drive, 15 power head system, 151 rotation axis of power head system, 1 52 driving actuator, 153 fixture, 154 front center system, 16 supporting system, 17 dressing wheel system, 171 rotating axis of dressing wheel system, 172 dressing electric spindle, 173 dressing wheel, 174 dressing wheel seat, 18 first supporting shaft, 181 axis of first supporting shaft, 19 first bracket, 20 second supporting shaft, 201 axis of second supporting shaft, 21 second bracket, 22 rotating shaft, 23 first composite component, 24 second composite component. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "radial", "axial" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Among them, "upper" and "lower", "left" and "right", "front" and "rear" are opposite in direction, "transverse" and "longitudinal", "radial" and "axial" are perpendicular, the axial direction is the front-to-back direction in the figure, and the transverse direction is the left-to-right direction in the figure.

[0034] In the description of the present invention, it is necessary to understand that the technical features defined by the terms "first", "second", "third" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present invention.

[0035] In the description of the present invention, the parts refer to shaft-type external thread parts.

[0036] The present invention is described in detail below in conjunction with specific embodiments and accompanying drawings.

[0037] like Figure 1 The small special CNC thread grinding machine shown includes:

[0038] like Figure 2-5As shown, a longitudinal carriage 13 can be driven by a third driver 14 to move longitudinally forward and backward, and a power head system 15 for clamping one end of the part 1 and driving the part to rotate, a support system 16 for clamping the other end of the part 1, and a dressing wheel system 17 for dressing the grinding wheel are purchased on the longitudinal carriage 13. The rotation axis 151 of the power head system is coaxial with the axis 101 of the part and is parallel to the rotation axis 171 of the dressing wheel system and the moving direction of the longitudinal carriage;

[0039] like Figure 1 , Figure 8 The first grinding wheel 2 and the second grinding wheel 8 are arranged on both sides of the part 1 in the radial direction. The first grinding wheel 2 is coaxially arranged on the first spindle 3 and can be moved horizontally left and right by the first transverse carriage 5 under the drive of the first driver 7. The second grinding wheel 8 is coaxially arranged on the second spindle 9 and can be moved horizontally left and right by the second transverse carriage 11 under the drive of the second driver 12.

[0040] An electrical program control system controls the rotation of the first spindle 3, the second spindle 9, the power head system 15, the dressing wheel system 17 and the movement of the first transverse carriage, the second transverse carriage, and the longitudinal carriage to dress the grinding wheel and process parts;

[0041] The rotation of the part driven by the power head system 15 and the longitudinal forward and backward movement driven by the third driver 14 are numerically linked and can be processed by the first grinding wheel 2 and the second grinding wheel 8 at the same time.

[0042] Accordingly, the first grinding wheel and the second grinding wheel can simultaneously perform rough grinding and fine grinding on the parts, taking into account the accuracy, surface quality and efficiency of the parts. The difficulty of tool setting and even the defect of scrapping of thread profiles in different working steps are overcome, so that the parts have higher processing accuracy and better surface morphology, and the production efficiency is improved, and the manufacturing cost is reduced.

[0043] Figure 1 In the structure shown, the first spindle 3 is arranged on the first spindle seat 4, which is directly or indirectly arranged on the first transverse carriage 5, which is arranged on one side of the bed 6; the second spindle 9 is arranged on the second spindle seat 10, which is directly or indirectly arranged on the second transverse carriage 11, which is arranged on the other side of the bed 6; the longitudinal carriage 13 is arranged in the middle position of the bed 6 in the left-right direction and is located between the first transverse carriage 5 and the second transverse carriage 11. With this structure, the entire thread grinder is roughly bilaterally symmetrical, with a reasonable layout, and is suitable for precise and efficient processing of micro-shaft external threaded parts.

[0044] Figure 6In the structure shown, the first spindle seat 4 is directly or indirectly arranged on the end face of the first composite component 23 having the rotatable first support shaft 18, the first support shaft 18 and the first composite component 23 are fixed together so that the first support shaft 18 can rotate the first composite component 23, the axis 181 of the first support shaft is perpendicular to the axis line 101 of the part, the first support shaft 18 is directly or indirectly arranged on the first bracket 19, and the first bracket 19 is directly or indirectly arranged on the first transverse carriage 5; the first support shaft can rotate the first spindle seat 4, the first spindle 3 and the first grinding wheel 2 around the axis 181 of the first support shaft to adjust the posture of the first grinding wheel 2, and the first grinding wheel 2 is positioned and maintained in the desired posture by locking the first support shaft. Accordingly, the posture of the first grinding wheel 2 can be adjusted as needed, and the micro-shaft external threaded parts with different leads and different guide angles can be matched during processing to achieve precision processing.

[0045] Figure 8 In the structure shown, the axis 181 of the first support shaft intersects the first grinding wheel 2 at the center of the outer circle geometric profile of the first grinding wheel 2. This ensures that the posture of the first grinding wheel can be accurately adjusted by the rotation of the first support shaft to ensure the quality of processing.

[0046] Figure 7 In the illustrated structure, the second spindle seat 10 is directly or indirectly arranged on the end face of the second composite component 24 having the rotatable second support shaft 20, the second support shaft 20 and the second composite component 24 are fixed together so that the second support shaft 20 can rotate the second composite component 24, the axis 201 of the second support shaft is perpendicular to the axis 101 of the part, the second support shaft 20 is directly or indirectly arranged on the second bracket 21, and the second bracket 21 is directly or indirectly arranged on the second transverse carriage 11; the second support shaft can rotate around the axis 201 of the second support shaft with the second spindle seat 10, the second spindle 9 and the second grinding wheel 8 to adjust the posture of the second grinding wheel 8, and the second grinding wheel 8 is positioned and maintained in the desired posture by locking the second support shaft. Accordingly, the posture of the second grinding wheel 2 can be adjusted as needed, and the micro-shaft external threaded parts with different leads and different guide angles can be matched during processing to achieve precision processing.

[0047] Figure 8 In the structure shown, the axis 201 of the second support shaft intersects the second grinding wheel 8 at the center of the outer geometric profile of the second grinding wheel 8. This ensures that the posture of the first grinding wheel is accurately adjusted by the rotation of the first support shaft to ensure the quality of processing.

[0048] Figure 6-7In the structure shown, the first bracket 19 and the second bracket 21 are box components. The first bracket 19 and the second bracket 21 are endowed with sufficient structural performance to play the role of positioning and supporting the first support shaft 18 and / or the second support shaft 20. In other embodiments, the first bracket 19 and the second bracket 21 can also be frame components.

[0049] Figure 2-5 In the structure shown, the longitudinal carriage 13 is composed of an upper carriage 131 and a lower carriage 132 stacked together. The upper carriage 131 can rotate slightly relative to the lower carriage 132 around the rotating shaft 22 connecting the two carriages and be locked; the power head system 15, the support system 16 and the dressing wheel system 17 are arranged on the upper carriage 131 and arranged in the front and back in the longitudinal direction. Based on this, the size difference (similar to the taper) of the parts in the entire axial length can be fine-tuned as needed to ensure the processing accuracy.

[0050] Figure 2-5 In the structure shown, the power head system 15 includes a driving actuator 152 with a central through hole that can drive the part 1 to rotate, a front center system 154 that passes through the central through hole of the driving actuator 152 and is directly or indirectly fixed to the longitudinal carriage, and a clamp 153 installed at the front end of the driving actuator 152 and extending toward the part 1 to clamp the part 1. The power head system 15 has the functions of positioning, clamping and driving the rotation of the shaft part 1. The structure is compact, the division of labor is reasonable, and the error is minimized.

[0051] Figure 2-5 In the structure shown, the dressing wheel system 17 includes at least one set of dressing wheels 173 and a dressing electric spindle 172. The dressing wheel 173 is coaxially mounted on the dressing electric spindle 172, and the dressing electric spindle 172 is directly or indirectly mounted on the longitudinal carriage 13 through a dressing wheel seat 174. Accordingly, the dressing electric spindle carries the dressing wheel to perform precise dressing on the first grinding wheel and / or the second grinding wheel.

[0052] Figure 2-5 In the structure shown, the dressing wheel system 17 includes two groups of bilaterally symmetrical dressing wheels 173 and a dressing electric spindle 172, and the first grinding wheel 2 and the second grinding wheel 8 are each dressed by a dressing wheel 173. Accordingly, different dressing wheels can be configured according to the different functions of the first grinding wheel 2 and the second grinding wheel 8 to improve the dressing accuracy. Among them, each dressing wheel 173 is configured at a position adjacent to its dressing grinding wheel. The dressing wheel seat 174 is directly or indirectly configured on the upper layer of the longitudinal carriage, or is indirectly configured on the upper layer of the longitudinal carriage in combination with other components.

[0053] In a specific implementation, the first transverse slide 5 and the second transverse slide 11 are not necessarily located on the same horizontal plane, and can be inclined at an angle to the horizontal plane as needed, or the first transverse slide 5 and the second transverse slide 11 can have a step difference in height; it is not necessarily required that the first transverse slide 5 and the second transverse slide 11 move horizontally left and right on the same plane, and the lateral movement directions of the two on both radial sides of the part 1 can intersect at an angle.

[0054] The forward and backward movement direction of the longitudinal carriage 13 can be horizontal or inclined at an angle to the horizontal plane, but in the grinding area, the axis 181 of the first support shaft and the axis 201 of the second support shaft must be perpendicular to the axis 101 of the part.

[0055] The process of grinding parts on a thread grinder is as follows:

[0056] Loading, the part 1 is installed between the power head system 15 and the support system 16, and the power head system 15 positions and clamps the part 1.

[0057] The first spindle 3 and the second spindle 9 are started to rotate the first grinding wheel 2 and the second grinding wheel 8 .

[0058] The position of the groove to be ground of the part is aligned with the geometrical contour position of the grinding wheel. Since the number of heads and the lead of the thread grooves of different parts are different, an intermediate adjustment mechanism (such as a carriage) capable of longitudinal fine adjustment is added between the first bracket 19 and the first transverse carriage 5 or / and between the second bracket 21 and the second transverse carriage 11. The bracket is mounted on the intermediate adjustment mechanism, and the intermediate adjustment mechanism is mounted on the transverse carriage, so that the displacement of the first grinding wheel 2 and the second grinding wheel 8 in the direction of the axis 101 of the part can be finely adjusted.

[0059] Under the action of the third driver 14, the longitudinal carriage 13 is moved in a fast forward manner and drives the part 1 to the starting position for part grinding.

[0060] Under the action of the first driver 7 , the first grinding wheel 2 is quickly brought into the grinding setting position, thereby achieving radial feeding of the first grinding wheel 2 .

[0061] Under the action of the second driver 12 , the second grinding wheel 8 is quickly brought into the grinding setting position, thereby realizing radial feeding of the second grinding wheel 8 .

[0062] Under the action of the third driver 14, the longitudinal carriage 13 is moved and the part 1 is driven to feed axially along its axis at a set speed; at the same time, the execution power head 15 starts the grinding CNC linkage and drives the part 1 to rotate at a set speed. Under the combined action, the part 1 can rotate and move axially at the same time according to the set requirements.

[0063] When the grinding wheel completes the grinding of all threads, all the transverse carriages retreat, the execution power head 15 stops rotating, and the longitudinal carriage stops axially advancing.

[0064] All numerical control processes of machining, including start position data, stop position data, machining process parameters and dressing compensation data, are automatically memorized and logically controlled by the machine tool electrical system.

[0065] If the part has a large grinding allowance, a second and third round of grinding can be repeated until the design requirements are met.

[0066] After grinding is completed, the third driver 14 moves the longitudinal carriage 13 in a fast forward motion and drives the part 1 to the starting position of the part grinding for unloading.

[0067] Reload and start the next cycle.

[0068] Equipped with a robot for automatic loading and unloading, it can realize the full automation of small screw thread grinding.

[0069] The process of dressing the grinding wheel on the thread grinder shown in the figure is as follows:

[0070] The first composite component 23 is rotated around the axis 181 of the first support shaft, and the first grinding wheel 2 and the first spindle 3 are synchronously driven to rotate around the axis 181 of the first support shaft, so that the axis 301 of the first spindle 3 is rotated to be parallel to the axis line 101 of the part and located in the same plane, and the first support shaft is locked to fix the posture of the first grinding wheel 2 and the first spindle 3.

[0071] The second composite component 24 is rotated around the axis 201 of the second support shaft, and the second grinding wheel 8 and the second spindle 9 are synchronously driven to rotate around the axis 201 of the second support shaft, so that the axis 901 of the second spindle 9 is rotated to be parallel to the axis line 101 of the part and located in the same plane, and the first support shaft is locked to fix the posture of the second grinding wheel 8 and the second spindle 9.

[0072] The first spindle 3, the second spindle 9 and the dressing electric spindle 172 are started to rotate.

[0073] The first transverse slide 5 is moved under the action of the first driver 7, and the longitudinal slide 13 is moved under the action of the third driver 14; the first transverse slide 5 and the longitudinal slide 13 can be numerically controlled and linked as needed to form a plane coordinate system, and the dressing wheel 173 on the longitudinal slide 13 can dress the first grinding wheel 2 on the first transverse slide 5 to obtain a desired contour morphology.

[0074] After the first grinding wheel 2 is dressed, the first transverse slide 5 retreats to the original set position; synchronously, the first composite component 23 drives the first grinding wheel 2, the first spindle 3, etc. to rotate around the axis 181 of the first support shaft to the grinding setting and the inclination angle consistent with the guide direction and angle of the thread groove of the part to be ground area, and locks the first support shaft to fix the posture of the first grinding wheel 2 and the first spindle 3.

[0075] The second transverse slide 11 is moved under the action of the second driver 12, and the longitudinal slide 13 is moved under the action of the third driver 14; the second transverse slide 11 and the longitudinal slide 13 can be numerically controlled and linked as needed to form a plane coordinate system, and the dressing wheel 173 on the longitudinal slide 13 can dress the second grinding wheel 8 on the second transverse slide 11 to obtain a desired contour.

[0076] After the second grinding wheel 8 is trimmed, the second transverse slide 11 retreats to the original set position; synchronously, the second composite component 24 drives the second grinding wheel 8, the second spindle 9, etc. to rotate around the axis 201 of the second support shaft to the grinding setting and the inclination angle consistent with the guide direction and angle of the thread groove of the part to be ground area, and locks the second support shaft to fix the posture of the second grinding wheel 8 and the second spindle 9.

[0077] Under the action of the third driver 14, the longitudinal carriage 13 is moved back to a set position, and the trimming electric spindle 172 stops rotating.

[0078] The trimming process is complete.

[0079] As described above, by configuring the first grinding wheel 2 and the second grinding wheel 8 on both radial sides of the part 1, the first grinding wheel and the second grinding wheel can simultaneously perform rough grinding and fine grinding on the part, taking into account the accuracy, surface quality and efficiency of the part. The defects of difficult tool alignment and even scrapping of thread profiles in different working steps are overcome, so that the part has higher processing accuracy and better surface morphology, and the production efficiency is improved, and the manufacturing cost is reduced.

[0080] By arranging the power head system 15, the support system 16 and the dressing wheel system 17 together on the longitudinal carriage 13, the clamping of the parts, the axial feeding and the dressing of the first grinding wheel 2 and the second grinding wheel 8 are realized. In addition, the structure is compact, the drive and the support plate are saved, and the manufacturing cost of the equipment is reduced.

Claims

1. Small special CNC thread grinder, characterized by include: A longitudinal carriage (13) can be driven by a third driver (14) to move longitudinally forward and backward, and a power head system (15) for clamping one end of a part (1) and driving the part to rotate, a support system (16) for clamping the other end of the part (1), and a dressing wheel system (17) for dressing a grinding wheel are installed on the longitudinal carriage (13), and a rotation axis (151) of the power head system is coaxial with an axis (101) of the part and parallel to a rotation axis (171) of the dressing wheel system and the moving direction of the longitudinal carriage; A first grinding wheel (2) and a second grinding wheel (8) are arranged on both radial sides of a part (1), wherein the first grinding wheel (2) is coaxially arranged on a first spindle (3) and can be moved laterally left and right by a first transverse carriage (5) under the drive of a first driver (7), and the second grinding wheel (8) is coaxially arranged on a second spindle (9) and can be moved laterally left and right by a second transverse carriage (11) under the drive of a second driver (12); An electrical program control system controls the rotation of the first spindle (3), the second spindle (9), the power head system (15), the dressing wheel system (17) and the movement of the first transverse carriage (5), the second transverse carriage (11), and the longitudinal carriage (13) to dress the grinding wheel and process parts; The rotation of the part driven by the power head system (15) and the longitudinal forward and backward movement driven by the third driver (14) are numerically linked and can be processed simultaneously by the first grinding wheel (2) and the second grinding wheel (8).

2. The small special CNC thread grinder according to claim 1 is characterized in that: The first spindle (3) is arranged on a first spindle seat (4), the first spindle seat (4) is directly or indirectly arranged on a first transverse carriage (5), and the first transverse carriage (5) is arranged on one side of a bed (6); the second spindle (9) is arranged on a second spindle seat (10), the second spindle seat (10) is directly or indirectly arranged on a second transverse carriage (11), and the second transverse carriage (11) is arranged on the other side of the bed (6); the longitudinal carriage (13) is arranged at a middle position of the bed (6) in a left-right direction and is located between the first transverse carriage (5) and the second transverse carriage (11).

3. The small special CNC thread grinder according to claim 2 is characterized in that: The first spindle seat (4) is directly or indirectly arranged on a first composite component (23) having a rotatable first support shaft (18), the axis (181) of the first support shaft is perpendicular to the axis (101) of the part, the first support shaft (18) is directly or indirectly arranged on a first bracket (19), and the first bracket (19) is directly or indirectly arranged on a first transverse carriage (5); the first support shaft can rotate with the first grinding wheel (2) around the axis (181) of the first support shaft to adjust the posture of the first grinding wheel (2).

4. The small special CNC thread grinder according to claim 3 is characterized in that: The axis (181) of the first support shaft intersects with the first grinding wheel (2) at the center of the outer circle geometric profile of the first grinding wheel (2).

5. The small special CNC thread grinder according to any one of claims 2 to 4 is characterized in that: The second spindle seat (10) is directly or indirectly arranged on a second composite component (24) having a rotatable second support shaft (20), the axis (201) of the second support shaft is perpendicular to the axis (101) of the part, the second support shaft (20) is directly or indirectly arranged on a second bracket (21), and the second bracket (21) is directly or indirectly arranged on a second transverse carriage (11); the second support shaft can rotate with the second grinding wheel (8) around the axis (201) of the second support shaft to adjust the posture of the second grinding wheel (8).

6. The small special CNC thread grinder according to claim 5 is characterized in that: The axis (201) of the second support shaft intersects with the second grinding wheel (8) at the center of the outer circle geometric profile of the second grinding wheel (8).

7. The small special CNC thread grinder according to claim 1 or 2, characterized in that: The longitudinal carriage (13) is composed of an upper carriage (131) and a lower carriage (132) stacked together. The upper carriage (131) can slightly rotate relative to the lower carriage (132) around the rotation axis (22) and be locked. The power head system (15), the support system (16) and the dressing wheel system (17) are arranged on the upper carriage (131) and in a front and rear arrangement in the longitudinal direction.

8. The small special CNC thread grinder according to claim 1 or 2, characterized in that: The power head system (15) includes a driving actuator (152) having a central through hole that can drive the part (1) to rotate, a front center system (154) that passes through the central through hole of the driving actuator (152) and is directly or indirectly fixed to the longitudinal carriage, and a clamp (153) installed at the front end of the driving actuator (152) for clamping the part (1).

9. The small special CNC thread grinder according to claim 1 or 2, characterized in that: The dressing wheel system (17) comprises at least one set of dressing wheels (173) and a dressing electric spindle (172), wherein the dressing wheel (173) is coaxially mounted on the dressing electric spindle (172), and the dressing electric spindle (172) is directly or indirectly mounted on the longitudinal carriage (13) via a dressing wheel seat (174).

10. The small special CNC thread grinder according to claim 9 is characterized in that: The dressing wheel system (17) comprises two groups of bilaterally symmetrical dressing wheels (173) and a dressing electric spindle (172), and the first grinding wheel (2) and the second grinding wheel (8) are each dressed by a dressing wheel (173).

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