Numerical control grinding machine grinding wheel grinding constant force sensing device

Abstract

The utility model discloses a grinding constant force sensing device for a grinding wheel of a numerical control grinding machine, and relates to the technical field of grinding machining of grinding wheels of numerical control grinding machines. The constant force detection device comprises a grinding wheel spindle part and a constant force detection mechanism, the grinding wheel spindle part comprises a base plate, an electric spindle seat, an electric spindle and a grinding wheel connecting rod; the constant force detection mechanism comprises a constant force sensor, a spring piece, a front protection plate and a rear protection plate; the front end of the constant force sensor is provided with an induction base making contact with the induction support, the induction support senses micro-deformation of the spring piece generated during grinding of the grinding wheel, and the micro-deformation is transmitted to the constant force sensor through the induction base. According to the constant force detection device, the sensing support on the lower side of the base plate makes contact with the sensing base of the constant force sensor support so that deformation force can be transmitted to the constant force sensor, the constant force sensor senses deformation and transmits data to the PLC, and therefore efficient constant force detection is obtained. The volatility is relatively small, and the stability is relatively good.

Description

Technical Field

[0001] This utility model belongs to the field of CNC grinding machine grinding wheel technology, and in particular relates to a constant force sensing device for CNC grinding machine grinding wheel. Background Technology

[0002] When grinding bearing workpieces using a grinding machine, the workpiece is prone to deformation and burning due to unstable grinding force and heat. Currently, acid pickling is used to detect burns, but this is a destructive test that affects the processing results. Therefore, constant force grinding, also known as constant temperature grinding, is added to the grinding process to ensure product stability and yield.

[0003] Existing grinding force detection methods for grinding machines typically involve current and power measurement, where the controller is installed inside the machine tool's electrical cabinet, and fluctuations in current and power are detected. However, due to the high sensitivity and large fluctuations in current and voltage, the detection is unstable and affects the workpiece pass rate. Therefore, this technical solution proposes a mechanical constant force sensing device for CNC grinding machine wheel grinding. Utility Model Content

[0004] This invention provides a constant force sensing device for grinding wheels on a CNC grinding machine. The sensor is fixed to the slide table via a sensor mounting bracket, and a sensing seat is installed at the front end. When the grinding wheel grinds the workpiece, the force generated during grinding is transmitted to the spring plates on both sides of the bottom of the pad, causing micro-deformation. The deformation force is transmitted to the constant force sensor through the contact between the sensing bracket on the underside of the pad and the sensing seat of the constant force sensor bracket. The constant force sensor detects the deformation and transmits the data to the PLC controller, thus achieving efficient constant force detection. This solution is based on a mechanical structure, resulting in less fluctuation and better stability compared to existing current fluctuation detection methods. In summary, it solves the problems in the background technology.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model discloses a constant force sensing device for grinding wheel of a CNC grinding machine, which includes a grinding wheel shaft and a constant force detection mechanism;

[0007] The grinding wheel shaft includes a pad, an electric spindle seat fixedly mounted on the pad, an electric spindle mounted on the electric spindle seat, and a grinding wheel connecting rod with a grinding wheel and a pressure cap at one end of the electric spindle. An induction bracket is provided on the underside of the pad; a rear protective cover for the electric spindle is provided at the rear of the electric spindle seat.

[0008] The constant force detection mechanism includes a constant force sensor fixedly mounted on the slide by a sensor bracket, spring plates mounted on the left and right sides of the pad, a front protective plate mounted on the front side of the pad, and a rear protective plate mounted on the rear side of the pad. The front end of the constant force sensor is equipped with a sensing seat that contacts the sensing bracket. The sensing bracket senses the micro-deformation of the spring plates during grinding by the grinding wheel and transmits it to the constant force sensor through the sensing seat.

[0009] Furthermore, the spring sheet is clamped and fixed by the outer fixing strip and the inner fixing pressure strip, and the sensing bracket is provided with a sensing head that is in contact with the inner wall of the spring sheet.

[0010] Furthermore, both the fixing strip and the bottom of the fixing strip are provided with fixing holes, and are respectively fixedly connected to the slide table through the fixing hole diameter connecting pin.

[0011] Furthermore, the pad has a threaded hole on its surface, and a screw is threaded into the threaded hole. An adjusting bolt passes through the pad and its bottom end is positioned at a distance from the surface of the slide.

[0012] Furthermore, the surface of the spring sheet is provided with first mounting holes at equal intervals in the transverse direction, and the spring sheet is connected to the mounting positioning holes on the side of the pad by screws through the first mounting holes.

[0013] Furthermore, the front and rear protective plates are provided with second mounting holes at equal intervals on their surfaces, which are connected to the mounting and positioning holes on the front and rear sides of the pad by screws.

[0014] Furthermore, an adjusting shim is installed on the surface of the sensor bracket via a positioning hole and screws, and the adjusting shim is fixedly connected to the slide table by screws; the position of the sensor bracket is adjusted by the installation position of the screws on the adjusting shim and the positioning hole.

[0015] The present invention has the following advantages over the prior art:

[0016] This solution uses a sensor mounting bracket to fix the sensor on the slide table, with a sensor base installed at the front end. When the grinding wheel is grinding the workpiece, the force generated by the grinding wheel is transmitted to the spring plates on both sides of the bottom of the pad, causing micro-deformation. The deformation force is transmitted to the constant force sensor through the contact between the sensor bracket on the underside of the pad and the sensor base of the constant force sensor bracket. The constant force sensor detects the deformation and transmits the data to the PLC controller, thus achieving efficient constant force detection. This solution is based on a mechanical structure, which has relatively smaller fluctuations and better stability compared to existing current fluctuation detection methods.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a constant force sensing device for grinding wheels in a CNC grinding machine according to the present invention;

[0020] Figure 2 for Figure 1 Structural bottom view;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure from the perspective of point A;

[0022] Figure 4 for Figure 1 Schematic diagram of the structure from the perspective of B;

[0023] Figure 5 for Figure 1 A structural diagram from a C-angle perspective;

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 11-Front protective plate, 14-Constant force sensor, 32-Adjusting shim, 33-Induction bracket, 34-Induction seat, 37-Sensor bracket, 51-Electric spindle seat, 60-Rear protective plate, 70-Spring plate, 71-Pad plate, 72-Fixing pressure strip, 73-Fixing strip, 75-Adjusting bolt, 76-Grinding wheel connecting rod, 77-Pressure cap, 78-Grinding wheel, 79-Electric spindle, 80-Electric spindle rear protective cover. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "lower side", "rear part", "both sides", "front end", "bottom", "surface", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Please see Figure 1-5 As shown, the present invention provides a constant force sensing device for grinding wheels on a CNC grinding machine, comprising a grinding wheel shaft and a constant force detection mechanism;

[0029] The grinding wheel spindle assembly includes a pad 71, an electric spindle seat 51 fixedly mounted on the pad 71, an electric spindle 79 mounted on the electric spindle seat 51, and a grinding wheel connecting rod 76 with a grinding wheel 78 and a pressure cap 77 at one end of the electric spindle 79. An induction bracket 33 is provided on the underside of the pad 71. A rear protective cover 80 is provided at the rear of the electric spindle seat 51, serving as a waterproof cover for the electric spindle connector. The entire grinding wheel spindle assembly is fixed to the pad 71, with upper and side busbars to ensure the parallelism and height difference between the electric spindle 79 and the workpiece axis. After being fixed with bolts and tapered pins, grinding can be achieved. The corresponding electric spindle 79, grinding wheel 78, pressure cap 77, and grinding wheel connecting rod 76 are all existing structures in the art, and their specific principles will not be elaborated in this specification. The electric spindle 79 is a flange-type grinding wheel spindle, fixed to the electric spindle seat 51 with screws.

[0030] The constant force detection mechanism includes a constant force sensor 14 fixedly mounted on the slide table by a sensor bracket 37, spring plates 70 mounted on the left and right sides of the pad 71, a front protective plate 11 mounted on the front side of the pad 71, and a rear protective plate 60 mounted on the rear side of the pad 71. The front end of the constant force sensor 14 is equipped with a sensing seat 34 that contacts the sensing bracket 33. The sensing bracket 33 senses the micro-deformation of the spring plate 70 during grinding with a grinding wheel and transmits it to the constant force sensor 14 through the sensing seat 34. The constant force sensor 14 is a B6E3-C3-20kg-3B type constant force sensor, which can efficiently detect the generated micro-deformation data. The spring plate 70 is a deformable stainless steel spring plate with a thickness of 1mm.

[0031] Since the spring plate 70 is a deformable part, when replacing it later, the height of the 3-M8 adjusting bolts 75 on the shim plate is adjusted to support the shim plate 71, the screws fixing the spring plate 70 are removed, and the spring plate 70 is quickly replaced. After that, the three adjusting bolts 75 can be lowered.

[0032] The spring sheet 70 is clamped and fixed by the outer fixing strip 73 and the inner fixing pressure strip 72. The sensing bracket 33 is equipped with a sensing head, which is in contact with the inner wall of the spring sheet 70. When the workpiece is ground by the grinding wheel, the force generated during the grinding is transmitted to the micro-deformation on the bottom spring sheet 70. The deformation force is transmitted to the constant force sensor 14 through the contact between the sensing bracket 33 on the lower side of the pad 71 and the sensing seat 34 of the sensor bracket 37.

[0033] The fixing strips 72 and 73 are both provided with fixing holes at their bottoms, and are fixedly connected to the slide table by connecting pins with fixing hole diameters; the surface of the pad 71 is provided with threaded holes, and an adjusting bolt 75 is threaded into the threaded holes. The adjusting bolt 75 passes through the pad 71 and its bottom end is spaced apart from the surface of the slide table; the surface of the spring sheet 70 is provided with first mounting holes at equal intervals in the transverse direction, and is connected to the mounting positioning holes on the side of the pad 71 by screws through the first mounting holes; the surfaces of the front protective plate 11 and the rear protective plate 60 are provided with second mounting holes at equal intervals in the transverse direction, and are connected to the mounting positioning holes on the front and rear sides of the pad 71 by screws through the second mounting holes.

[0034] The sensor bracket 37 has an adjusting shim 32 installed on its surface through a positioning hole and screws. The adjusting shim 32 is fixedly connected to the slide table by screws. The sensor bracket 37 is positioned by adjusting the screws on the adjusting shim 32 and the positioning hole.

[0035] When the constant force sensing device of the CNC grinding machine is used to grind the workpiece, the micro deformation generated by the grinding force of the grinding wheel is transmitted directly to the constant force sensor through the slight deformation of the spring plate at the bottom and the sensing bracket, so as to achieve efficient detection. This detection is based on mechanical detection, which has less fluctuation and relatively lower sensitivity compared to current and voltage, thus resulting in better stability.

[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A constant force sensing device for grinding wheels on a CNC grinding machine, characterized in that, Including the grinding wheel shaft and the constant force testing mechanism; The grinding wheel shaft includes a pad (71), an electric spindle seat (51) fixedly mounted on the pad (71), an electric spindle (79) mounted on the electric spindle seat (51), and a grinding wheel connecting rod (76) with a grinding wheel (78) and a pressure cap (77) at one end of the electric spindle (79). An induction bracket (33) is provided on the lower side of the pad (71). A rear protective cover (80) for the electric spindle is provided at the rear of the electric spindle seat (51). The constant force detection mechanism includes a constant force sensor (14) fixedly mounted on the slide by a sensor bracket (37), spring plates (70) mounted on the left and right sides of the pad (71), a front protective plate (11) mounted on the front side of the pad (71), and a rear protective plate (60) mounted on the rear side of the pad (71). The front end of the constant force sensor (14) is equipped with a sensing seat (34) that contacts the sensing bracket (33). The sensing bracket (33) senses the micro-deformation of the spring plate (70) during grinding by the grinding wheel and transmits it to the constant force sensor (14) through the sensing seat (34).

2. The constant force sensing device for grinding wheel of a CNC grinding machine according to claim 1, wherein, The spring sheet (70) is clamped and fixed by the outer fixing strip (73) and the inner fixing pressure strip (72). The sensing bracket (33) is provided with a sensing head, which is in contact with the inner wall of the spring sheet (70).

3. The constant force sensing device for grinding wheel of a CNC grinding machine according to claim 2, wherein, The bottom of the fixing strip (72) and the fixing strip (73) are provided with fixing holes, and are respectively fixedly connected to the slide table through the fixing hole diameter connecting pin.

4. The constant force sensing device for grinding wheel of a CNC grinding machine according to claim 1, wherein, The pad (71) has a threaded hole on its surface, and an adjusting bolt (75) is threaded into the threaded hole. The adjusting bolt (75) passes through the pad (71) and its bottom end is spaced apart from the surface of the slide.

5. The constant force sensing device for grinding wheel of a CNC grinding machine according to claim 1, wherein, The surface of the spring sheet (70) is provided with first mounting holes at equal intervals in the transverse direction, and the spring sheet (70) is connected to the mounting positioning hole on the side of the pad (71) by screws through the first mounting holes.

6. The constant force sensing device for grinding wheel of a CNC grinding machine according to claim 1, wherein, The front protective plate (11) and the rear protective plate (60) are provided with second mounting holes at equal intervals in the transverse direction, and are connected to the mounting positioning holes on the front and rear sides of the pad (71) by screws through the second mounting holes.

7. The constant force sensing device for grinding wheel of a CNC grinding machine according to claim 1, wherein, The sensor bracket (37) has an adjustment shim (32) installed on its surface through a positioning hole and screws. The adjustment shim (32) is fixedly connected to the slide table by screws. The sensor bracket (37) is adjusted in position by adjusting the screws on the adjustment shim (32) and the positioning hole.

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