A double-station grinding machine for mechanical watch screws

Abstract

The present invention relates to equipment for producing mechanical watches, with the goal of providing a dual-station screw grinder for mechanical watches to improve screw grinding quality, increase grinding efficiency, and reduce production costs. The technical solution is: a dual-station screw grinder for mechanical watches, characterized by comprising a base, a grinding base plate slidably positioned longitudinally on the base, a grinding chuck slidably positioned transversely on the base for mounting screws on its bottom surface, a longitudinal drive mechanism for driving the longitudinal movement of the grinding base plate, and a transverse drive mechanism for driving the transverse movement of the grinding chuck.

Description

Technical Field

[0001] The invention relates to a mechanical watch production device, in particular to a mechanical watch screw double-station grinding machine. Background Art

[0002] Screws are one of the precision parts of mechanical watches. There are 20 to 50 screws installed in a mechanical watch. Mechanical watches are luxury products, so screws ( Figure 13 )The roughness of the head end face 20 needs to be ground to the mirror standard.

[0003] There is still a gap in the grinding level of existing screws. High-end screws are all made in Switzerland, and their main features are manual grinding, high precision and high price, while low-end screws are ground by grinding machines and the price is only one tenth of high-end screws.

[0004] The market is full of grinders of various specifications and models. The working principle of the grinder is basically the same, that is, the grinding disc of the grinder only rotates around its own axis, and the upper part is equipped with 3-4 auxiliary rotating mechanisms to keep the workpiece relatively fixed and rotate with the auxiliary rotating mechanism. The workpiece is smaller than the radius of the grinding disc and rotates around its own axis without exceeding the maximum outer circle of the grinding disc. The contact surface between the two is supplied with abrasives, and is equipped with two types of grinding pressure, namely a counterweight disc and a compression spring. The former is used for fine grinding, and the latter is used for grinding before fine grinding. The same below

[0005] The problem when using commercially purchased grinders to process screws is that, when the grinding roughness is required to reach Ra0.025-0.05, due to the grinding mechanism, the grinder's disc and rotating motion cause a concave arc to appear locally on the grinding plate, and the ground screw head also produces a tiny protrusion, which cannot achieve a mirror effect. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and provide a double-station grinding machine for mechanical watch screws to improve the screw grinding quality, increase the grinding efficiency and reduce production costs.

[0007] The technical solution of the present invention is:

[0008] A double-station grinding machine for mechanical watch screws, characterized in that the grinding machine comprises a base, a grinding base plate slidably positioned on the base longitudinally, a grinding chuck for mounting screws on the bottom surface and slidably positioned on the base transversely, a longitudinal drive mechanism for driving the grinding base plate to move longitudinally, and a transverse drive mechanism for driving the grinding chuck to move transversely;

[0009] The longitudinal drive mechanism and the transverse drive mechanism are arranged in an I-shape, and the two longitudinal drive mechanisms are arranged at both ends of the transverse drive mechanism; the grinding chucks and the grinding base plates are arranged correspondingly up and down, each longitudinal drive mechanism is provided with two grinding base plates, and two grinding chucks are provided at each end of the transverse drive mechanism.

[0010] The bottom surface of the grinding chuck is provided with a positioning hole for installing screws; the side surface of the grinding chuck is provided with a side plate for cooperating with grinding, and the bottom edge of the side plate is lower than the bottom surface of the grinding chuck; the longitudinal drive mechanism and the transverse drive mechanism are both motor screw drive mechanisms.

[0011] The grinding chuck and the grinding base plate are both rectangular; four side plates are provided on the side of the grinding chuck, and the bottom edges of the side plates are coplanar with the grinding surface of the screw head; the grinding chuck is also provided with a counterweight plate.

[0012] A clamping mechanism is provided between the grinding chuck and the transverse driving mechanism; the clamping mechanism comprises a guide assembly connecting the transverse driving mechanism and the grinding chuck, and a spring applying a downward thrust to the grinding chuck.

[0013] The longitudinal driving mechanism includes a longitudinal motor and a longitudinal track fixed on the base, a longitudinal slider that can slide along the longitudinal track, a longitudinal slide fixed on the longitudinal slider, a longitudinal screw that can be rotatably positioned on the base and driven by the longitudinal motor, and a longitudinal nut that is engaged with the longitudinal screw and fixed to the longitudinal slide.

[0014] The transverse driving mechanism includes a transverse motor and a transverse rail fixed on the base, a transverse slider that can slide along the transverse rail, a transverse slide fixed on the transverse slider, a transverse screw that can be rotatably positioned on the base and driven by the transverse motor, and a transverse nut that is engaged with the transverse screw and fixed to the transverse slide.

[0015] The transverse screw is vertically arranged between the two longitudinal screws; the transverse motor is arranged on the side of the transverse screw, and the transverse motor drives the transverse screw to rotate through the first synchronous pulley, the second synchronous pulley and the synchronous belt.

[0016] The grinding base plate is fixed on the longitudinal sliding block; a transverse frame is provided on the transverse sliding plate, which extends to above the grinding base plate of the longitudinal driving mechanism at both ends; a counterweight plate is fixed on the top surface of the grinding chuck; the counterweight plate is used for fine grinding; a guide assembly connects the transverse frame and the counterweight plate; a spring is used for grinding before fine grinding; both ends of the spring support the counterweight plate and the transverse frame.

[0017] The base is provided with a fixed cover, a longitudinal cover and a transverse cover; the fixed cover surrounds the transverse driving mechanism, the transverse cover is arranged above the fixed cover and is fixed to the transverse slide; the longitudinal cover is arranged on the side of the fixed cover, the longitudinal cover surrounds the longitudinal driving mechanism, and the longitudinal cover is fixed to the grinding base plate.

[0018] The beneficial effects of the present invention are:

[0019] The present invention configures three motion pairs arranged in an I-shape to drive the grinding chuck and the grinding base plate to move relative to each other, simulating the figure-eight motion trajectory of the manual grinding block gauge, ensuring uniform wear of the head end face of the screw, thereby meeting the mirror surface requirements and extremely high flatness requirements, and improving product quality. In addition, the present invention is provided with double stations, that is, grinding stations are provided at both ends of the transverse driving mechanism, and each station is equipped with two pairs of grinding base plates and grinding chucks. Through the simultaneous movement of four pairs of grinding base plates and grinding chucks, the production efficiency is greatly improved and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is one of the three-dimensional structural schematic diagrams of the present invention.

[0021] Figure 2 This is the second schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 3 It is a main structural schematic diagram of the present invention.

[0023] Figure 4 It is a schematic diagram of the top structure of the present invention.

[0024] Figure 5 It is a left-side structural schematic diagram of the present invention.

[0025] Figure 6 yes Figure 3 Schematic diagram of the cross-sectional structure in the AA direction.

[0026] Figure 7 yes Figure 5 Schematic diagram of the cross-sectional structure along the BB direction.

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the grinding chuck of the present invention.

[0028] Figure 9 It is a schematic diagram of the main structure of the grinding chuck of the present invention.

[0029] Figure 10 It is a schematic cross-sectional structural diagram of the grinding chuck of the present invention.

[0030] Figure 11 It is a schematic diagram of the fixed cover, longitudinally movable cover and transversely movable cover of the present invention (showing a longitudinally movable driving mechanism).

[0031] Figure 12 It is a schematic diagram of the main structure of the screw.

[0032] Figure 13 It is a schematic diagram of the grinding trajectory.

[0033] Figure markings: base 1, grinding base plate 2, grinding chuck 3, positioning hole 3.1, longitudinal movement motor 4.1, longitudinal movement rail 4.2, longitudinal movement slider 4.3, longitudinal movement skateboard 4.4, longitudinal movement screw 4.5, longitudinal movement nut 4.6, transverse movement motor 5.1, first synchronous pulley 5.11, second synchronous pulley 5.12, transverse movement rail 5.2, transverse movement slider 5.3, transverse movement skateboard 5.4, transverse movement screw 5.5, transverse movement nut 5.6, side plate 6, counterweight plate 7, guide sleeve 8.1, guide rod 8.2, guide frame 8.3, spring 9, spring guide rod 9.1, transverse frame 10, top plate 10.1, fixed cover 11, longitudinal movement cover 12, transverse movement cover 13, head end face 20. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] like Figure 1 As shown, a double-station grinding machine for mechanical watch screws includes a base 1, a grinding base plate 2, a grinding chuck 3, a longitudinal drive mechanism, and a transverse drive mechanism.

[0036] The base is an I-shaped structure. The grinding base can be longitudinally ( Figure 4 The grinding chuck is slidably positioned on the base (in the vertical direction), and the longitudinal driving mechanism is a motor screw driving mechanism, which is used to drive the grinding base plate to move longitudinally. The grinding chuck can be horizontally ( Figure 4 The horizontal direction in the horizontal direction) is slidably positioned on the base, and the transverse driving mechanism is a motor screw driving mechanism, which is used to drive the grinding chuck to move longitudinally.

[0037] The longitudinal drive mechanism and the transverse drive mechanism are arranged in an I-shape, and the two longitudinal drive mechanisms are arranged at both ends of the transverse drive mechanism; Figure 4 As shown, the transverse driving mechanism and the longitudinal driving mechanism form a kinematic pair in the x-axis direction and two kinematic pairs in the z-axis direction.

[0038] The grinding chucks are arranged correspondingly to the grinding base plates above and below, with a grinding chuck correspondingly arranged above each grinding base plate. Each longitudinal drive mechanism is provided with two grinding base plates, and two grinding chucks are provided at each end of the transverse drive mechanism.

[0039] The top surface of the grinding plate is a grinding surface, and the grinding chuck is used to install screws. The bottom surface of the grinding chuck is provided with a positioning hole 3.1 for installing the screw. The screw is inserted into the positioning hole (with the head end of the screw facing the grinding plate below) and bonded in place. The grinding plate and the screw are driven by a longitudinal drive mechanism and a transverse drive mechanism to respectively move relative to each other to achieve grinding. The head end of the screw and the grinding plate are evenly worn, thereby ensuring that the ground screw meets the requirements of mirror finish and extremely high flatness. The screw is bonded to the positioning hole with varnish, and after curing, it is ground and finally dissolved and removed with a thinner.

[0040] The grinding chuck is equipped with a side plate 6. The bottom edge of the side plate is lower than the bottom surface of the grinding chuck (this distance is appropriate for the thickness of the screw head) and is coplanar with the grinding surface of the screw head. The function of the side plate is to participate in the grinding process, ensuring uniform grinding of the screw and the grinding base plate. During grinding, the longitudinal and transverse drive mechanisms cooperate to move the screw along an eight-shaped trajectory (while abrasive is injected into the grinding area), processing the grinding surface to an extremely high flatness, achieving the required mirror reflection.

[0041] The grinding chuck and the grinding base plate are both rectangular. Four side plates are provided on the sides of the grinding chuck, and a counterweight plate 7 is provided above the grinding chuck. A clamping mechanism is also provided between the grinding chuck and the transverse drive mechanism.

[0042] The clamping mechanism includes a guide assembly and a spring 9. The guide assembly connects the transverse drive mechanism and the grinding chuck, and the spring applies a downward thrust to the grinding chuck. The guide assembly includes a guide sleeve 8.1 and a guide rod 8.2 positioned vertically slidably in the guide sleeve. The guide sleeve is fixed to the transverse frame of the transverse drive mechanism. The guide rod is fixed to the counterweight plate via a guide frame 8.3, and the grinding chuck is fixed to the bottom surface of the counterweight plate. The spring is arranged between the transverse drive mechanism and the grinding chuck, with the top end of the spring resting against the transverse frame of the transverse drive mechanism and the bottom end of the spring resting against the counterweight plate. A spring guide rod 9.1 is also provided in the spring, and the spring is mounted on the spring guide rod.

[0043] The longitudinal drive mechanism includes a longitudinal motor 4.1 and a longitudinal track 4.2 fixed to the base, a longitudinal slider 4.3 slidable along the longitudinal track, a longitudinal slide plate 4.4, a longitudinal screw 4.5 rotatably positioned on the base and driven by the longitudinal motor (the longitudinal motor shaft and the longitudinal screw are connected by a coupling), and a longitudinal nut 4.6 engaged with the longitudinal screw. The longitudinal slide plate is fixed to the longitudinal slider and longitudinal nut.

[0044] The transverse drive mechanism includes a transverse motor 5.1 and a transverse track 5.2 fixed to the base, a transverse slider 5.3 that slides along the transverse track, a transverse slide plate 5.4 fixed to the transverse slider, a transverse screw 5.5 rotatably positioned on the base and driven by the transverse motor (the transverse motor shaft and the transverse screw are connected via a coupling), and a transverse nut 5.6 that engages the transverse screw and is fixed to the transverse slide plate. A transverse frame 10 is mounted on the transverse slide plate. The transverse frame extends above the grinding base plate, a guide sleeve is fixed to the transverse frame, and a spring-loaded top plate 10.1 is fixed above the transverse frame. The transverse motor is arranged on the side of the transverse screw, which shortens the length of the transverse drive mechanism and reduces the size of the entire device. The transverse motor drives the transverse screw to rotate through the first synchronous pulley 5.11, the second synchronous pulley 5.12, and the synchronous belt (omitted in the figure). The first synchronous pulley is fixed to the transverse motor shaft, the second synchronous pulley is fixed to the transverse screw, and the synchronous belt is mounted on the first synchronous pulley and the second synchronous pulley.

[0045] The base is provided with a fixed cover 11, a longitudinal cover 12, and a transverse cover 13. The fixed cover surrounds the transverse drive mechanism and has an opening to accommodate the movement of the transverse drive mechanism. The transverse cover is fixed to the transverse slide, surrounding the transverse slide and shielding the opening of the fixed cover. When the grinding chuck moves, the transverse cover and the fixed cover provide shielding and protection for the transverse drive mechanism. The longitudinal cover is located on the side of the fixed cover and surrounds the longitudinal drive mechanism. The longitudinal cover is fixed to the grinding base plate and provides shielding and protection for the longitudinal drive mechanism when the grinding base plate moves.

[0046] The size of the grinding base plate is 210 mm×210 mm, and the size of the grinding chuck is 100 mm×100 mm. 512 screws can be clamped at one time, and the grinding efficiency is high.

[0047] Since each longitudinal drive mechanism is provided with two grinding base plates, there are four grinding base plates in total. Correspondingly, the transverse frame extends to the top of the grinding base plates on both sides (the transverse frame is an I-shaped structure), and two grinding chucks are provided at each end of the transverse frame.

[0048] These four pairs of grinding base plates and grinding chucks can grind 2048 screws (512×4=2048) simultaneously, that is, the ingenious design of one X-axis stroke and two Z-axis strokes can achieve simultaneous grinding in four positions, making the grinder simple in structure, small in size, small in X and Z strokes, and greatly improving the grinding efficiency.

[0049] Since each screw and four side plates participate in the grinding, the grinding base plate is passively ground evenly, so that the grinding base plate has a high flatness during the grinding process, which reacts to the ground screw head plane, also making it have a high flatness.

[0050] Calculate the weight of the counterweight plate. When lapping, adjust the spring so that it is not compressed and only applies pressure through the counterweight plate. When grinding before lapping, use the spring and the counterweight plate to apply pressure at the same time.

[0051] The working principle of the present invention is:

[0052] 1) The transverse drive mechanism drives the grinding chuck to move along the positive direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the negative direction of the z-axis (the screw moves in the opposite direction relative to the grinding base plate);

[0053] Starting from the starting point O, the grinding track of the screw on the grinding base is Figure 13 The arc a in

[0054] 2) The traverse drive mechanism drives the grinding chuck to move along the negative direction of the x-axis;

[0055] The grinding track of the screw on the grinding base is Figure 13 Line b in

[0056] 3) The transverse drive mechanism drives the grinding chuck to move along the positive direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the positive direction of the z-axis (the screw moves in the opposite direction relative to the grinding base plate);

[0057] The grinding track of the screw on the grinding base is Figure 13 The arc c in

[0058] 4) The transverse drive mechanism drives the grinding chuck to move along the negative direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the negative direction of the z-axis (the screw moves in the opposite direction relative to the grinding base plate);

[0059] The grinding track of the screw on the grinding base is Figure 13 The arc d in

[0060] 5) The longitudinal drive mechanism drives the grinding base plate to move along the positive direction of the z-axis (the screw moves in the opposite direction relative to the grinding base plate);

[0061] The grinding track of the screw on the grinding base is Figure 13 The straight line e in

[0062] 6) The transverse drive mechanism drives the grinding chuck to move along the positive direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the negative direction of the z-axis (the screw moves in the opposite direction);

[0063] The grinding track of the screw on the grinding base is Figure 13 The arc f in

[0064] 7) The longitudinal drive mechanism drives the grinding base plate to move along the positive direction of the z-axis (the screw moves in the opposite direction relative to the grinding base plate);

[0065] The grinding track of the screw on the grinding base is Figure 13 The straight line g in

[0066] 8) The traverse drive mechanism drives the grinding chuck to move along the negative direction of the x-axis;

[0067] The grinding track of the screw on the grinding base is Figure 13 Return to the starting point O and go back to step 1).

[0068] The above arc trajectory is achieved by circular interpolation motion.

[0069] This grinding method can simulate the figure-eight motion trajectory of a manual grinding block gauge, so that the end face of the screw head and the grinding base are evenly worn, thereby ensuring that the grinding part meets the mirror surface requirements and extremely high flatness requirements.

[0070] The accompanying drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Claims

1. A double-station grinding machine for mechanical watch screws, characterized by: The grinding machine comprises a base (1), a grinding base plate (2) positioned on the base in a longitudinally slidable manner, a grinding chuck (3) for mounting screws on the bottom surface and positioned on the base in a transversely slidable manner, a longitudinal drive mechanism for driving the grinding base plate to move longitudinally, and a transverse drive mechanism for driving the grinding chuck to move transversely; The longitudinal drive mechanism and the transverse drive mechanism are arranged in an I-shape, with the two longitudinal drive mechanisms being provided at both ends of the transverse drive mechanism; the grinding chucks and the grinding base plates are arranged correspondingly above and below, with two grinding base plates provided on each longitudinal drive mechanism, and two grinding chucks provided at each end of the transverse drive mechanism; The bottom surface of the grinding chuck is provided with a positioning hole (3.1) for installing a screw; the side surface of the grinding chuck is provided with a side plate (6) for cooperating with grinding, and the bottom edge of the side plate is lower than the bottom surface of the grinding chuck; the longitudinal drive mechanism and the transverse drive mechanism are both motor screw drive mechanisms; The grinding chuck and the grinding base plate are both rectangular; the side of the grinding chuck is provided with four side plates, the bottom edges of the side plates are coplanar with the grinding surface of the screw head; the grinding chuck is also provided with a counterweight plate (7); A clamping mechanism is provided between the grinding chuck and the transverse drive mechanism; the clamping mechanism comprises a guide assembly connecting the transverse drive mechanism and the grinding chuck, and a spring (9) applying a downward thrust to the grinding chuck; The grinding method of this grinder is as follows: 1) The lateral drive mechanism drives the grinding chuck to move along the positive direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the negative direction of the z-axis; the screw moves in the opposite direction relative to the grinding base plate; Starting from the starting point O, the grinding track of the screw on the grinding base is arc a; 2) The traverse drive mechanism drives the grinding chuck to move along the negative direction of the x-axis; the grinding trajectory of the screw on the grinding base is straight line b; 3) The lateral drive mechanism drives the grinding chuck to move along the positive direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the positive direction of the z-axis; the screw moves in the opposite direction relative to the grinding base plate; the grinding trajectory of the screw on the grinding base plate is arc c; 4) The lateral drive mechanism drives the grinding chuck to move along the negative direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the negative direction of the z-axis; the screw moves in the opposite direction relative to the grinding base plate; the grinding trajectory of the screw on the grinding base plate is arc d; 5) The longitudinal drive mechanism drives the grinding base plate to move along the positive direction of the z-axis; the screw moves in the opposite direction relative to the grinding base plate; the grinding track of the screw on the grinding base plate is a straight line e; 6) The lateral drive mechanism drives the grinding chuck to move along the positive direction of the x-axis, and the longitudinal drive mechanism drives the grinding base plate to move along the negative direction of the z-axis; the screw moves in the opposite direction; the grinding trajectory of the screw on the grinding base plate is arc f; 7) The longitudinal drive mechanism drives the grinding base plate to move along the positive direction of the z-axis; the screw moves in the opposite direction relative to the grinding base plate; the grinding track of the screw on the grinding base plate is a straight line g; 8) The traverse drive mechanism drives the grinding chuck to move along the negative x-axis direction; the grinding trajectory of the screw on the grinding base is a straight line h, and it returns to the starting point O, and returns to step 1); When lapping, adjust the spring so that it is not compressed and only the counterweight plate is used to apply pressure. When grinding before lapping, use both the spring and the counterweight plate to apply pressure at the same time.

2. A double-station grinding machine for mechanical watch screws according to claim 1, characterized in that: The longitudinal movement drive mechanism comprises a longitudinal movement motor (4.1) and a longitudinal movement track (4.2) fixed on a base, a longitudinal movement slider (4.3) capable of sliding along the longitudinal movement track, a longitudinal movement slide plate (4.4) fixed on the longitudinal movement slider, a longitudinal movement lead screw (4.5) rotatably positioned on the base and driven by the longitudinal movement motor, and a longitudinal movement nut (4.6) meshed with the longitudinal movement lead screw and fixed to the longitudinal movement slide plate.

3. A double-station grinding machine for mechanical watch screws according to claim 2, characterized in that: The transverse drive mechanism comprises a transverse motor (5.1) and a transverse rail (5.2) fixed on a base, a transverse slider (5.3) slidable along the transverse rail, a transverse slide plate (5.4) fixed on the transverse slider, a transverse lead screw (5.5) rotatably positioned on the base and driven by the transverse motor, and a transverse nut (5.6) meshed with the transverse lead screw and fixed to the transverse slide plate.

4. A double-station grinding machine for mechanical watch screws according to claim 3, characterized in that: The transverse screw is vertically arranged between the two longitudinal screws; the transverse motor is arranged on the side of the transverse screw, and the transverse motor drives the transverse screw to rotate through the first synchronous pulley (5.11), the second synchronous pulley (5.12), and the synchronous belt.

5. A double-station grinding machine for mechanical watch screws according to claim 4, characterized in that: The grinding base plate is fixed on the longitudinal sliding block; a transverse frame (10) is provided on the transverse sliding block, the transverse frame extends to above the grinding base plate of the longitudinal driving mechanism at both ends, a counterweight plate is fixed on the top surface of the grinding chuck, the counterweight plate is used for fine grinding, a guide assembly connects the transverse frame and the counterweight plate, a spring is used for grinding before fine grinding, and both ends of the spring support the counterweight plate and the transverse frame.

6. A double-station grinding machine for mechanical watch screws according to claim 5, characterized in that: The base is provided with a fixed cover (11), a longitudinal cover (12) and a transverse cover (13); the fixed cover surrounds the transverse drive mechanism, the transverse cover is arranged above the fixed cover and is fixed to the transverse slide; the longitudinal cover is arranged on the side of the fixed cover, the longitudinal cover surrounds the longitudinal drive mechanism, and the longitudinal cover is fixed to the grinding base plate.

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