Elastic non-surface contact positioning device

Abstract

The utility model relates to the technical field of numerical control machine tools, and discloses an elastic non-surface contact positioning device which comprises butt joint bodies, each butt joint body comprises a fixing portion and a connecting portion, the connecting portions of the two butt joint bodies are connected in a non-surface contact mode and then are paired to form a positioning mechanism, and the positioning mechanism is connected with the fixing portion. The spherical surfaces on the two sides of the convex connector and the straight surface of the inner wall of the concave connector are adopted for point contact or line contact, the positioning precision is higher than that of surface contact, positioning can be carried out without applying force, and after positioning is completed, residual counter-acting force cannot cause inclination of the side milling head; wing ends which are symmetrical left and right are arranged on the fixing part of at least one of the two butt joint bodies in the positioning mechanism; and the non-surface contact parts of the two connecting parts are correspondingly arranged on the left wing end and the right wing end in the vertical direction, so that other redundant positioning supporting points in previous cylinder or conical surface positioning are removed, and the over-positioning problem is solved.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, specifically to an elastic non-surface contact positioning device. Background Technology

[0002] Existing machine tools and their accessories, such as side milling heads, are mostly positioned by using tapered pins, cylindrical pins, or locating blocks to achieve rigid surface contact between the pins and corresponding grooves. Figure 9-10 As shown, the main structure of the rigid surface contact positioning device 100 in the prior art is as follows: a vertical shaft 310 is provided on the machine tool frame 300, a horizontal shaft 320 is installed at the bottom of the vertical shaft 310, a side milling head 200 is installed at one end of the horizontal shaft 320, a flange 140 is installed on the vertical shaft 310 between the machine tool frame 300 and the horizontal shaft 320, and a surface contact positioning device 100 is provided on the flange 140. The surface contact positioning device 100 includes a force-applying screw hole (not shown in the figure) provided on the flange 140, a force-applying bolt 110 is provided in the force-applying screw hole, a conical groove 130 is provided on the machine tool frame 300 corresponding to the force-applying screw hole, a conical pin 120 is installed in the conical groove 130, and the bottom of the conical pin 120 abuts against the head of the force-applying bolt 110. Force is applied to the tapered pin 120 so that the tapered surface of the tapered pin 120 contacts the corresponding tapered surface of the tapered groove 120, which serves to position the vertical shaft 310. However, the reaction force F2 caused by the applied force F1 will cause the side milling head 200 to tilt relative to the machine tool frame 300. When the applied force F1 of the force-applying bolt 110 is too small, the circumferential horizontal positioning of the side milling head 200 will be inaccurate and the contact surface will not be completely tight, making the side milling head 200 unusable. When the applied force F1 of the force-applying bolt 110 is too large, it will cause the side milling head 200 to tilt, its internal structure will wear out quickly, and it may even become unusable when the tilt is severe. The design of the tapered pin has high requirements for the use and manufacturing of the hole and the pin, such as the mating angle and mating diameter, and a preload is required along the tapered direction to achieve the positioning effect.

[0003] Meanwhile, the existing positioning device is over-positioned due to the spatial position structure and geometric tolerances of the positioning parts of the machine tool frame 300 and the side milling head 200. This causes internal stress and deformation in the side milling head 200, and also leads to accelerated wear of the positioning device and reduced service life. Utility Model Content

[0004] The purpose of this utility model is to provide an elastic non-surface contact positioning device to solve the problems mentioned in the background art, such as the surface contact positioning of rigid surface contact positioning devices requiring pre-pressure to achieve the positioning effect, the over-positioning problem of the side milling head, and the problem that the contact surfaces cannot be completely pressed together.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A flexible non-surface contact positioning device includes a positioning mechanism. The positioning mechanism includes docking bodies, each of which includes a fixing part and a connecting part. The connecting parts of two docking bodies are connected to each other in a non-surface contact manner to form a positioning mechanism. In the positioning mechanism, one of the connecting parts of the two docking bodies is a rigid connecting part and the other is an elastic connecting part. In the positioning mechanism, one of the fixing parts of the two docking bodies is fixedly connected to the end of a machine tool and the other is fixedly connected to the end of a milling head. In the positioning mechanism, one of the connecting parts of the two docking bodies is a convex interface and the other is a concave interface. The contact portion of the concave interface and the convex interface is a non-surface contact portion.

[0007] Furthermore, in the positioning mechanism, at least one of the two docking bodies has a fixed part with symmetrical wing ends; the non-face contact parts of the two connecting parts in the positioning mechanism are arranged on the left and right wing ends corresponding to each other in the vertical direction.

[0008] Preferably, the positioning mechanism includes a first docking body and a second docking body that are paired with each other. The first docking body includes a first fixing part and a first connecting part. The first fixing part has a first left wing end and a first right wing end on both sides of its end. The first connecting part has a first convex interface with a cross-section larger than a semicircle and a first groove in the middle. The side of the first convex interface has a first spherical surface. The second docking body includes a second fixing part and a second connecting part. The front end of the second connecting part has a second concave interface. The second concave interface has a second positioning cavity that matches the first convex interface. The cross-section of the second positioning cavity is a circle smaller than that of the first convex interface. The inner wall of the second positioning cavity has a second straight surface. The first spherical surface of the first convex interface and the second straight surface of the second concave interface have corresponding first non-surface contact parts and second non-surface contact parts in the vertical direction of the first left wing end and the first right wing end.

[0009] Furthermore, the first convex interface is a first convex elastic interface, the second concave interface is a second concave rigid interface, and the first convex elastic interface is snapped into the second concave rigid interface; the first fixing part is fixedly connected to the machine tool end, and the second fixing part is fixedly connected to the milling head end.

[0010] Preferably, the positioning mechanism includes a third docking body and a fourth docking body that are paired with each other. The third docking body includes a third fixing part and a third connecting part. The third fixing part has a third left wing end and a third right wing end on both sides of its end. The third connecting part has a third convex interface with a rectangular cross-section and a third straight surface on its side. The fourth docking body includes a fourth fixing part and a fourth connecting part. The fourth connecting part has a fourth concave interface and a fourth positioning cavity that matches the third convex interface. The fourth positioning cavity has a circular cross-section smaller than that of the third convex interface and a fourth spherical surface on its inner wall. The third straight surface of the third convex interface and the fourth spherical surface of the fourth concave interface have a third non-surface contact part and a fourth non-surface contact part respectively in the vertical direction of the third left wing end and the third right wing end.

[0011] Furthermore, the third convex interface is a third convex rigid interface, the fourth concave interface is a fourth concave elastic interface, and the third convex rigid interface is snapped into the fourth concave elastic interface; the third fixing part is fixedly connected to the machine tool end, and the fourth fixing part is fixedly connected to the milling head end.

[0012] Preferably, the positioning mechanism includes a fifth docking body and a sixth docking body that are paired with each other. The fifth docking body includes a fifth fixing part and a fifth connecting part. The fifth fixing part has a fifth left wing end and a fifth right wing end on both sides of its end. The fifth connecting part has a fifth concave interface and a fifth open clamp. The fifth open clamp has a fifth spherical surface on both clamping surfaces. The sixth docking body includes a sixth fixing part and a sixth connecting part. The sixth connecting part has a sixth convex interface. The sixth convex interface has a rectangular cross-section. The sixth convex interface and the two sides corresponding to the two clamping surfaces of the fifth open clamp have a sixth straight surface. The fifth spherical surface of the fifth concave interface and the sixth straight surface of the sixth convex interface have a fifth non-surface contact part and a sixth non-surface contact part respectively in the vertical direction of the fifth left wing end and the fifth right wing end.

[0013] Furthermore, the fifth concave interface is a fifth concave elastic interface, the sixth convex interface is a sixth convex rigid interface, and the sixth convex rigid interface is snapped into the fifth concave elastic interface; the fifth fixing part is fixedly connected to the machine tool end, and the sixth fixing part is fixedly connected to the milling head end.

[0014] Furthermore, the elastic non-surface contact positioning device is used for positioning between the machine tool and the side milling head mounted on the machine tool.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This utility model uses the spherical surfaces on both sides of the convex interface and the straight surface of the inner wall of the concave interface to make point contact or line contact, which is a non-surface contact. Compared with surface contact, the positioning accuracy is higher. Most importantly, the non-surface contact design does not require the application of force to perform positioning, avoiding the design of the conical pin positioning in the prior art that requires the application of force to position. The residual reaction force after positioning will not cause the side milling head to tilt.

[0016] This invention provides a positioning mechanism in which at least one of the two docking bodies has a fixed part with symmetrical wing ends; and the non-face contact parts of the two connecting parts are correspondingly arranged on the left and right wing ends in the vertical direction. In this way, the positioning device only performs positioning on the straight line or curve formed by the left and right wing ends, eliminating other redundant positioning support points in the previous cylindrical or conical surface positioning, solving the over-positioning problem, and achieving precise positioning.

[0017] This invention solves the problem of the contact points not being able to fit completely tightly by using a rigid connection part and an elastic connection part in the connection part of two docking bodies. The two are elastically connected and paired to form a positioning mechanism. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the non-surface contact positioning device of this utility model;

[0019] Figure 2 This is a partial cross-sectional view of the first embodiment of the non-surface contact positioning device of this utility model;

[0020] Figure 3 This is a top view of the first embodiment of the non-surface contact positioning device of this utility model;

[0021] Figure 4 This is a three-dimensional schematic diagram of the first docking body of this utility model;

[0022] Figure 5 This is a perspective view of the second embodiment of the non-surface contact positioning device of this utility model;

[0023] Figure 6 This is a cross-sectional view of the second embodiment of the non-surface contact positioning device of this utility model;

[0024] Figure 7 This is a perspective view of the third embodiment of the non-surface contact positioning device of this utility model;

[0025] Figure 8 This is a cross-sectional view of the third embodiment of the non-surface contact positioning device of this utility model;

[0026] Figure 9 This is a cross-sectional view of the prior art surface contact positioning device of this utility model;

[0027] Figure 10 This is a bottom view of the prior art surface contact positioning device of this utility model;

[0028] In the diagram: 100 - Surface contact positioning device, 110 - Force-applying bolt, 120 - Conical pin, 130 - Conical groove, 140 - Conical contact surface, F1 - Force applied, F2 - Reaction force, 200 - Side milling head, 300 - Machine tool frame, 410 - First docking body, 411 - First fixing part, 412 - First connecting part, 4121 - First spherical surface, 4122 - First groove, 420 - Second docking body, 421 - Second fixing part, 422 - Second connecting part, 4221 - Second positioning cavity 4222-Second straight surface, 510-Third docking body, 511-Third fixing part, 512-Third connecting part, 5121-Third straight surface, 520-Fourth docking body, 521-Fourth fixing part, 522-Fourth connecting part, 5221-Fourth spherical surface, 610-Fifth docking body, 611-Fifth fixing part, 612-Fifth connecting part, 6121-Fifth spherical surface, 620-Sixth docking body, 621-Sixth fixing part, 622-Sixth connecting part, 6221-Sixth straight surface. Detailed Implementation

[0029] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figure 1 As shown, an elastic non-surface contact positioning device includes a positioning mechanism. The positioning mechanism includes docking bodies, each of which includes a fixing part and a connecting part. The connecting parts of two docking bodies are connected to each other in a non-surface contact manner to form a positioning mechanism. In the positioning mechanism, one of the connecting parts of the two docking bodies is a rigid connecting part and the other is an elastic connecting part. In the positioning mechanism, one of the fixing parts of the two docking bodies is fixedly connected to the machine tool end and the other is fixedly connected to the milling head end. In the positioning mechanism, one of the connecting parts of the two docking bodies is a convex interface and the other is a concave interface. The contact part of the concave interface and the convex interface is a non-surface contact part. This device does not require force application. Positioning can be performed by using the non-surface contact of the concave interface and the convex interface. This structure avoids the design of force-applying bolts required for conical pin positioning in the prior art.

[0031] like Figure 1As shown, at least one of the two docking bodies in the positioning mechanism has a fixed part with symmetrical wing ends; the non-face contact parts of the two connecting parts in the positioning mechanism are arranged to correspond to the left and right wing ends in the vertical direction, so that the positioning device only performs positioning on the straight line or curve formed by the left and right wing ends, which can achieve precise positioning.

[0032] like Figure 2-4 As shown, in a first embodiment of the non-surface contact positioning device of this utility model: the positioning mechanism includes a first docking body 410 and a second docking body 420 that are paired with each other. The first docking body 410 includes a first fixing part 411 and a first connecting part 412. The first fixing part 411 has a first left wing end and a first right wing end on both sides of its end. The first connecting part 412 has a first convex interface. The cross-section of the first convex interface is a fan shape larger than a semicircle and has a first groove 4122 in the middle. The groove makes the first convex interface elastic. The side of the first convex interface has a first spherical surface 4121. The second docking body 410... 20 includes a second fixing part 421 and a second connecting part 422. The front end of the second connecting part 422 is provided with a second concave interface. The second concave interface is provided with a second positioning cavity 4221 that matches the first convex interface. The cross-section of the second positioning cavity 4221 is a circle smaller than that of the first convex interface. The inner wall of the second positioning cavity 4221 is provided with a second straight surface 4222. The first spherical surface 4121 of the first convex interface and the second straight surface 4222 of the second concave interface are respectively provided with a first non-surface contact part and a second non-surface contact part in the vertical direction of the first left wing end and the first right wing end.

[0033] like Figure 2-4 As shown, the first convex interface is a first convex elastic interface, the second concave interface is a second concave rigid interface, and the first convex elastic interface is snapped into the second concave rigid interface; the first fixing part 411 is fixedly connected to the machine tool end, and the second fixing part 421 is fixedly connected to the milling head end.

[0034] like Figure 5-6As shown, in a second embodiment of the non-surface contact positioning device of this utility model: the positioning mechanism includes a third docking body 510 and a fourth docking body 520 that are paired with each other. The third docking body 510 includes a third fixing part 511 and a third connecting part 512. The third fixing part 511 has a third left wing end and a third right wing end on both sides of its end. The third connecting part 512 has a third convex interface with a rectangular cross-section and a third straight surface 5121 on its side. The fourth docking body 520 includes a fourth fixing part 510 and a fourth docking body 520. 21 and the fourth connecting part 522, the fourth connecting part 522 is provided with a fourth concave interface, the fourth concave interface is provided with a fourth positioning cavity that matches the third convex interface, the cross-section of the fourth positioning cavity is a circle smaller than that of the third convex interface, and the inner wall of the fourth positioning cavity is provided with a fourth spherical surface 5221; the third straight surface 5121 of the third convex interface and the fourth spherical surface 5221 of the fourth concave interface are respectively provided with a third non-surface contact part and a fourth non-surface contact part in the vertical direction of the third left wing end and the third right wing end.

[0035] like Figure 5-6 As shown, the third convex interface is a third convex rigid interface, the fourth concave interface is a fourth concave elastic interface, and the third convex rigid interface is snapped into the fourth concave elastic interface; the third fixing part 511 is fixedly connected to the machine tool end, and the fourth fixing part 521 is fixedly connected to the milling head end.

[0036] like Figure 6-7 As shown, in a third embodiment of the non-surface contact positioning device of this utility model: the positioning mechanism includes a fifth docking body 610 and a sixth docking body 620 that are paired with each other. The fifth docking body 610 includes a fifth fixing part 611 and a fifth connecting part 612. The fifth fixing part 611 has a fifth left wing end and a fifth right wing end on both sides of its end. The fifth connecting part 612 has a fifth concave interface, and the fifth concave interface has a fifth open clamp. The fifth open clamp has a fifth spherical surface 6121 on both clamping surfaces. The sixth docking body 620... The body 620 includes a sixth fixing part 621 and a sixth connecting part 622. The sixth connecting part 622 is provided with a sixth convex interface. The cross-section of the sixth convex interface is rectangular. The six convex interface and the two sides corresponding to the two clamping surfaces of the fifth open clamp are provided with a sixth straight surface 6221. The fifth spherical surface 6121 of the fifth concave interface and the sixth straight surface 6221 of the sixth convex interface are provided with a fifth non-surface contact part and a sixth non-surface contact part in the vertical direction of the fifth left wing end and the fifth right wing end, respectively.

[0037] like Figure 6-7As shown, the fifth concave interface is a fifth concave elastic interface, the sixth convex interface is a sixth convex rigid interface, and the sixth convex rigid interface is snapped into the fifth concave elastic interface; the fifth fixing part 611 is fixedly connected to the machine tool end, and the sixth fixing part 621 is fixedly connected to the milling head end.

[0038] In practice, the elastic non-surface contact positioning device is used for positioning between the machine tool and the accessories installed on the machine tool.

[0039] In practice, the elastic non-surface contact positioning device is used for positioning between the machine tool and the side milling head mounted on the machine tool.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An elastic non-planar contact positioning device, characterized by: The positioning mechanism comprises two docking bodies, each of which comprises a fixed part and a connecting part, and the connecting parts of the two docking bodies are connected to each other in non-planar contact and then paired to form a positioning mechanism, one of the connecting parts of the two docking bodies in the positioning mechanism is a rigid connecting part, and the other is an elastic connecting part; one of the fixed parts of the two docking bodies in the positioning mechanism is fixedly connected to the end of a machine tool, and the other is fixedly connected to the end of a milling head; one of the connecting parts of the two docking bodies in the positioning mechanism is a convex interface, and the other is a concave interface, and the contact part of the concave interface and the convex interface is a non-planar contact part; the positioning mechanism comprises the following three structures: (1) a first docking body and a second docking body that are paired with each other, the first docking body comprises a first fixed part and a first connecting part, and the end part of the first fixed part is provided with a first left wing end and a first right wing end on both sides; the first connecting part is provided with a first convex interface, the cross section of the first convex interface is larger than a sector of a semicircle, and a first groove is formed in the middle part of the first convex interface, and the side surface of the first convex interface is provided with a first spherical surface; the second docking body comprises a second fixed part and a second connecting part, and the front end of the second connecting part is provided with a second concave interface, the second concave interface is provided with a second positioning cavity matched with the first convex interface, the cross section of the second positioning cavity is smaller than that of the first convex interface, and the inner wall of the second positioning cavity is provided with a second straight surface; the first spherical surface of the first convex interface and the second straight surface of the second concave interface correspondingly have a first non-planar contact part and a second non-planar contact part in the vertical direction of the first left wing end and the first right wing end; (2) a third docking body and a fourth docking body that are paired with each other, the third docking body comprises a third fixed part and a third connecting part, and the end part of the third fixed part is provided with a third left wing end and a third right wing end on both sides; the third connecting part is provided with a third convex interface, the cross section of the third convex interface is rectangular, and the side surface of the third convex interface is provided with a third straight surface; the fourth docking body comprises a fourth fixed part and a fourth connecting part, and the fourth connecting part is provided with a fourth concave interface, the fourth concave interface is provided with a fourth positioning cavity matched with the third convex interface, the cross section of the fourth positioning cavity is smaller than that of the third convex interface, and the inner wall of the fourth positioning cavity is provided with a fourth spherical surface; the third straight surface of the third convex interface and the fourth spherical surface of the fourth concave interface correspondingly have a third non-planar contact part and a fourth non-planar contact part in the vertical direction of the third left wing end and the third right wing end. (3) the fifth and sixth docking bodies are matched with each other, the fifth docking body comprises a fifth fixed part and a fifth connecting part, the fifth fixed part is provided with a fifth left wing end and a fifth right wing end on both sides of the end thereof, the fifth connecting part is provided with a fifth female interface, the fifth female interface is provided with a fifth open clamp, the fifth open clamp is provided with a fifth spherical surface on both clamping surfaces thereof, the sixth docking body comprises a sixth fixed part and a sixth connecting part, the sixth connecting part is provided with a sixth male interface, the sixth male interface has a rectangular cross section, the sixth male interface is provided with a sixth straight surface corresponding to the two clamping surfaces of the fifth open clamp, and the fifth spherical surface of the fifth female interface and the sixth straight surface of the sixth male interface are provided with a fifth non-surface contact part and a sixth non-surface contact part corresponding to the fifth left wing end and the fifth right wing end in the vertical direction.

2. The elastic non-planar contact positioning device of claim 1, wherein: The fixed part of at least one of the two docking bodies in the positioning mechanism is provided with left-right symmetrical wing ends, and the non-surface contact parts of the two connecting parts in the positioning mechanism are arranged corresponding to the left-right wing ends in the vertical direction.

3. The elastic non-planar contact positioning device of claim 1, wherein: The first male interface is a first male elastic interface, the second female interface is a second female rigid interface, the first male elastic interface is clamped into the second female rigid interface, the first fixed part is fixedly connected to the end of the machine tool, and the second fixed part is fixedly connected to the end of the milling head.

4. The elastic non-planar contact positioning device of claim 1, wherein: The third male interface is a third male rigid interface, the fourth female interface is a fourth female elastic interface, the third male rigid interface is clamped into the fourth female elastic interface, the third fixed part is fixedly connected to the end of the machine tool, and the fourth fixed part is fixedly connected to the end of the milling head.

5. The elastic non-planar contact positioning device of claim 1, wherein: The fifth female interface is a fifth female elastic interface, the sixth male interface is a sixth male rigid interface, the sixth male rigid interface is clamped into the fifth female elastic interface, the fifth fixed part is fixedly connected to the end of the machine tool, and the sixth fixed part is fixedly connected to the end of the milling head.

6. An elastic non-planar contact positioning device according to any one of claims 1-5, characterized in that: The elastic non-surface contact positioning device is used for positioning between the machine tool and the side milling head installed on the machine tool.

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