Clamp device for machining one-eighth sphere

Abstract

The clamp device comprises a first clamp and a second clamp, the first clamp comprises a first receiving disc, and the two sides of the first receiving disc are provided with a first main shaft connected through a plurality of first bolts and a first clamp body connected through a plurality of first inner hexagon screws respectively; the second clamp comprises a second receiving disc, a second main shaft connected through a plurality of second bolts and four spherical blocks connected through a plurality of second inner hexagon screws are arranged on the two sides of the second receiving disc respectively, and a positioning plate is arranged between the spherical blocks through fastening bolts and positioning pins. The spherical area of the spherical block is provided with a pressing ring through a locking screw. Through the optimized and improved design, the clamping, positioning, form and position precision and size precision of the workpiece in the machining process are effectively guaranteed and further improved, and then the effects of improving the production efficiency and the production quality, avoiding material waste and saving the production cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of clamp devices, in particular to a clamp device for processing a one-eighth sphere. Background Art

[0002] An eighth sphere, in simple terms, is one of the eight equal parts of a sphere. From a geometric point of view, it represents a part of a complete sphere that has been divided in a specific way in three-dimensional space. This shape has applications in many fields, including but not limited to design, engineering, architecture, and scientific research; in terms of production and processing, it is mainly cut and ground using milling machines.

[0003] The more conventional processing methods are:

[0004] 1. Turning: Select the blank size as Φ85*52mm, the total length of the end face is 51mm, and the outer circle is Φ84*10mm;

[0005] 2. Boring: Drilling R15 +0.02 -0mm and R20mm step holes, controlling the hole depth to 36 0 -0.1mm and 41mm;

[0006] 3. Turning: Turn and clamp the outer circle of Φ84, depth 8mm. Rough and fine turning of semi-circular ball SR400 -0.02mm, pay attention to control the total length to 500 -0.05mm;

[0007] 4. Milling: The dividing head is clamped with an outer circle of Φ84, 8mm deep. Mill two mutually perpendicular planes of the semicircular sphere SR400 -0.02mm axially, and leave a grinding allowance of 0.15mm. After the dividing head rotates 180°, the other two mutually perpendicular planes are milled in the same way to produce two one-eighth spheres; (5) Wire cutting: First, wire cutting is used to cut the junction of the two one-eighth spheres, and then radially cut off the two SR400 -0.02mm one-eighth spheres, leaving a grinding allowance of 0.15mm;

[0008] 5. Benchwork: Grind three vertical planes to ensure the size of SR400 -0.02mm, verticality 0.05mm, surface roughness 0.8μm, and sharp angle blunting 0.2mm.

[0009] However, this processing method has the following problems: (1) When a milling machine is used to cut two mutually perpendicular planes to ensure one-eighth of a sphere, only two workpieces can be retained, resulting in great waste; (2) The surface roughness of the three perpendicular planes is 0.8 μm, which requires grinding, which is inefficient; (3) The verticality of the three perpendicular planes caused by grinding is difficult to control. Utility Model Content

[0010] In view of the above technical problems in the related art, the utility model proposes a clamp device for processing a one-eighth sphere, which can overcome the above shortcomings of the prior art.

[0011] In order to achieve the above technical purpose, the technical solution of the utility model is implemented as follows:

[0012] A fixture device for machining a one-eighth sphere;

[0013] The fixture device for processing a one-eighth sphere comprises a first fixture and a second fixture, wherein the first fixture comprises a first receiving plate, and the first receiving plate has a first spindle connected by a plurality of first bolts and a first fixture body connected by a plurality of first hexagon socket screws on both sides thereof;

[0014] The second clamp includes a second connecting plate, and the second connecting plate has a second main shaft connected by a plurality of second bolts and four spherical blocks connected by a plurality of second hexagon socket screws on both sides, four positioning plates are arranged between the four spherical blocks through fastening bolts and positioning pins, and four clamping rings are arranged on the spherical areas of the four spherical blocks through locking screws.

[0015] Furthermore, the number of the first bolts and the number of the second bolts are both four.

[0016] Furthermore, each of the spherical blocks and the positioning plates are fastened to each other in pairs via two fastening bolts and two positioning pins, and the longitudinally arranged positioning plates and the transversely arranged positioning plates are perpendicular to each other.

[0017] Furthermore, the verticality of two adjacent positioning plates is 0.02 mm, and the parallelism of the planes of two adjacent positioning plates and the center line of the rotation axis is 0.01 mm.

[0018] Furthermore, a first workpiece is clamped in the first clamp body, a second workpiece is clamped between the clamping ring and the positioning plate, and the number of the first workpiece and the number of the second workpiece are both four.

[0019] Further, a side of the first workpiece away from the first clamp body abuts against the top of the inner cone, and a side of the second workpiece away from the clamping ring abuts against the top of the core shaft.

[0020] Furthermore, a cushion block is arranged in parallel between the first receiving plate and the first workpiece.

[0021] The beneficial effects of the utility model are as follows: through the optimized and improved design of the product of the utility model, the clamping, positioning, various shape and size accuracy of the workpiece during processing into a one-eighth sphere are effectively guaranteed and further improved, thereby achieving the technical effect of improving production efficiency, improving production quality, avoiding material waste, and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a side view of a first fixture of a fixture device for machining a one-eighth sphere according to an embodiment of the utility model;

[0024] Figure 2 This is a front view of a first fixture of a fixture device for machining a one-eighth sphere according to an embodiment of the utility model;

[0025] Figure 3 It is an assembly side view of a first fixture of a fixture device for machining a one-eighth sphere according to an embodiment of the utility model;

[0026] Figure 4 It is an assembly side view of a second fixture of a fixture device for machining a one-eighth sphere according to an embodiment of the utility model;

[0027] Figure 5 It is an assembly front view of a second fixture of a fixture device for machining a one-eighth sphere according to an embodiment of the utility model;

[0028] Figure 6 A clamping device for machining a one-eighth sphere according to an embodiment of the utility model Figure 4 Sectional view along line AA;

[0029] Figure 7 A clamping device for machining a one-eighth sphere according to an embodiment of the utility model Figure 4 Sectional view along the midline BB;

[0030] Figure 8 A clamping device for machining a one-eighth sphere according to an embodiment of the utility model Figure 4 Sectional view of the mid-CC line;

[0031] Fig. 9 A clamping device for machining a one-eighth sphere according to an embodiment of the utility model Figure 4 Cross-sectional view of the middle DD;

[0032] Fig.10 A clamping device for machining a one-eighth sphere according to an embodiment of the utility model Figure 4 Sectional view along line EE;

[0033] Fig.11 It is a right view of a finished workpiece of a one-eighth sphere according to a fixture device for machining a one-eighth sphere according to an embodiment of the utility model;

[0034] Fig.12 It is a front view of a finished workpiece of a one-eighth sphere according to a fixture device for machining a one-eighth sphere according to an embodiment of the utility model;

[0035] In the figure: 1. first bolt; 2. first spindle; 3. first connecting plate; 4. first hexagon socket screw; 5. first locking screw; 6. first clamping body; 7. first workpiece; 8. inner cone top; 9. spacer; 11. second bolt; 12. second spindle; 13. second connecting plate; 14. second hexagon socket screw; 15. positioning plate; 16. fastening bolt; 17. positioning pin; 18. second workpiece; 19. spindle top; 20. spherical block; 21. locking screw; 22. clamping ring. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0037] It should be understood that in the description of the embodiments of the present utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0038] like Figure 1-10 As shown, a fixture device for machining a one-eighth sphere according to an embodiment of the utility model comprises a first fixture and a second fixture, wherein the first fixture comprises a first receiving plate 3, and the first receiving plate 3 has a first spindle 2 connected by a plurality of first bolts 1 and a first fixture body 6 connected by a plurality of first hexagon socket screws 4 on both sides thereof;

[0039] The second clamp includes a second receiving plate 13, and the second receiving plate 13 has a second main shaft 12 connected by a plurality of second bolts 11 and four spherical blocks 20 connected by a plurality of second hexagon socket screws 14 on both sides, four positioning plates 15 are arranged between the four spherical blocks 20 through fastening bolts 16 and positioning pins 17, and four clamping rings 22 are arranged on the spherical areas of the four spherical blocks 20 through locking screws 21.

[0040] In a specific embodiment, the number of the first bolts 1 and the number of the second bolts 11 are both four.

[0041] In a specific embodiment, each of the spherical blocks 20 and the positioning plates 15 are fastened to each other through two fastening bolts 16 and two positioning pins 17, and the longitudinally arranged positioning plates 15 and the transversely arranged positioning plates 15 are perpendicular to each other.

[0042] In a specific embodiment, the verticality of two adjacent positioning plates 15 is 0.02 mm, and the parallelism between the planes of two adjacent positioning plates 15 and the rotation axis is 0.01 mm.

[0043] In a specific embodiment, the first workpiece 7 is clamped in the first clamp body 6, and the second workpiece 18 is clamped between the clamping ring 22 and the positioning plate 15. The number of the first workpiece 7 and the number of the second workpiece 18 are both four.

[0044] In a specific embodiment, the side of the first workpiece 7 away from the first clamp body 6 abuts against the inner cone tip 8 , and the side of the second workpiece 18 away from the clamping ring 22 abuts against the core shaft tip 19 .

[0045] In a specific embodiment, a cushion block 9 is arranged in parallel between the first receiving plate 3 and the first workpiece 7 .

[0046] In order to facilitate understanding of the above technical solution of the present invention, the above technical solution of the present invention is described in detail below through specific usage and working principle.

[0047] In specific use, a clamp device for machining a one-eighth sphere according to the utility model comprises a first clamp and a second clamp.

[0048] Among them, Figure 3 As shown, the design of the connection part between the first clamp and the lathe spindle is: first, the positioning hole of the first receiving plate 3 and the positioning step of the first spindle 2 are engaged; the first receiving plate 3 is fastened to the first spindle 2 by four first bolts 1; the positioning hole of the first clamp body 6 is engaged with the positioning step of the first receiving plate 3; the clamp body 6 is fastened to the first receiving plate 3 by four first hexagon socket screws 4.

[0049] like Figure 4 As shown, the second fixture is connected to the lathe spindle in the same design as the first fixture, including a positioning plate 15, a fastening bolt 16, a positioning pin 17, a spherical block 20, a locking screw 21 and a clamping ring 22. The second fixture is connected to the grinding machine headstock in the same way as the lathe.

[0050] Design of the first clamping body 6 of the first fixture for clamping the first workpiece 7:

[0051] The design of the first clamp body 6 clamping the first workpiece 7 during drilling and boring is as follows: Figure 1 Place the flat grinding surface of the first workpiece 7 on the positioning plane of the first clamp body 6, close to the first receiving plate 3, tighten the four first locking screws 5 at two locations, and the first workpiece 7 is clamped.

[0052] When turning the hemisphere, the first clamp is still used. The first workpiece 7 is clamped by turning. Considering the need to turn the hemisphere, a cushion block 9 is arranged in parallel between the first workpiece 7 and the first receiving plate 3. The thickness of the cushion block 9 can ensure that the hemisphere can be turned out. The first locking screw 5 is moved to the screw hole position at the outer edge of the clamp and tightened. The clamping of the first workpiece 7 is completed.

[0053] Design considerations for the first clamp of the first fixture for the first workpiece 7:

[0054] 1. The first clamp is specifically provided with a square hole of 85*85mm, and the square hole is provided with two positioning planes which are perpendicular to each other and parallel to the rotation axis of the first workpiece 7. The distance between the positioning plane and the rotation axis of the first spindle 2 is 40.50 -0.005mm. When the four first workpieces 7 are installed, the error between the intersection of the four first workpieces 7 and the rotation center is within 0.01mm, which can ensure that the coaxiality of SR400 -0.02mm and the step hole is within 0.05mm. The clamp can clamp four rectangular first workpieces 7 at a time, which greatly improves the production efficiency.

[0055] 2. A root cleaning groove is designed and processed to solve the problem of the first workpiece 7 in the lower left corner being flush with the positioning plane.

[0056] 3. When turning the hemisphere, it is not a whole workpiece, but four first workpieces 7 are clamped at the same time. A cone with a maximum cone diameter of Φ8 and a cone length of 3mm is turned inside the end face. The cone cooperates with the inner cone top 8. Relying on the gathering effect of the inner cone surface of the inner cone top 8, the four first workpieces 7 are gathered and fixed at the same time to prevent vibration of the workpiece during rough turning.

[0057] The design of the second clamping body of the second fixture for the workpiece clamping part:

[0058] Design as Figure 8 , 9 , 10. The second clamping body includes a positioning plate 15, a fastening bolt 16, a positioning pin 17, a spherical block 20, a locking screw 21 and a clamping ring 22. When installing the workpiece, a group of four second workpieces 18, namely, one-eighth spheres, are placed in turn between the two mutually perpendicular positioning plates 15 of the second clamp, and the spindle tip 19 fixed on the tailstock of the lathe is moved into the hole of the second workpiece 18, and the second workpiece 18 is pre-tightened so that the arc surface of the one-eighth sphere is close to the spherical block 20 in the clamping body, and then the eight locking screws 21 are screwed in four places to make the clamping ring 22 pre-tighten the second workpiece 18 so that the two vertical surfaces of the second workpiece 18 are close to the positioning plate 15. Observe the close contact between the second workpiece 18 and the positioning plate 15, and under the premise of ensuring that the positioning surface is flat, the second workpiece 18 is finally clamped through repeated operations.

[0059] The design considerations of the second fixture’s clamping body for the workpiece clamping part are as follows:

[0060] (1) The second clamp body is composed of four positioning plates 15 and four spherical blocks 20, which are interconnected and fastened by positioning pins 7 and fastening bolts 6. There are two positioning pins 17 and fastening bolts 16 at each location. The verticality of two adjacent positioning plates 15 is 0.02mm, and the parallelism of the plane with the axis of rotation is 0.01mm. The diameter of the inner sphere formed by the four spherical blocks 20 is SD80+0.005 0mm, and the circular runout error of the inner sphere 20 is within 0.005mm. When the spherical surface and two vertical planes of the second workpiece 18 are respectively close to the inner spherical surface of the spherical block 20 and the two vertical planes of the positioning plate 15, the end face of the second workpiece 18 is turned. At this time, the verticality of the end face and the other two vertical planes is within 0.05mm, thereby ensuring the verticality of the three planes of the workpiece.

[0061] (2) The mandrel tip 19 is provided to fix the second workpiece 18. The mandrel tip 19 and the vertical positioning plate 15 can increase the radial torque to prevent the second workpiece 18 from rotating. In use, it can well ensure that the second workpiece 18 will not loosen during radial turning of the end face, thereby ensuring the processing quality.

[0062] (3) The second fixture is installed on a grinding machine for end face grinding, which can not only ensure that the perpendicularity between the end face and the other two planes of the second workpiece 18 is within 0.05 mm, but also ensure that the surface roughness is within 0.8 μm. Compared with the aforementioned plane grinding, the work efficiency is greatly improved.

[0063] During processing, the fixture device for processing one-eighth sphere described in the utility model is used, and the specific processing technology is as follows:

[0064] 1. Milling: Use a rectangular body with a blank size of 42*42*55, and mill it to 41*41*54mm;

[0065] 2. Grinding: The four sides of the flat-grinded rectangular body are (40.50 -0.005) * (40.50 -0.005) mm, and the verticality of the four sides is controlled within 0.005 mm;

[0066] 3. Turning: Place the flat grinding surfaces of the four workpieces into the two positioning surfaces of the fixture 1 in turn, turn the end faces until they are exposed to light, drill and bore R15+0.02-0mm and R20 step holes, and the hole depths are 360 ​​-0.1mm and 41mm;

[0067] 4. Turning: Turn the workpiece and add a pad to clamp it. Turn a cone with a maximum cone diameter of Φ8 and a cone length of 3mm on the end face. Use the inner cone tip to gather and fix the four workpieces at the same time. Figure 5 , 6, 7. Rough turn SR40mm, after the rough turning is completed, withdraw the center, and fine turn the hemisphere to ensure that SR400 -0.02mm and the total length 500 -0.1mm;

[0068] 5. Turning: Turn the workpiece and put it into fixture 2, use the mandrel top to hold the workpiece tightly, and ensure that the length of the turning end face is 40.2mm;

[0069] 6. Grinding: Use fixture 2 to grind the end face to 400 -0.02mm.

[0070] To sum up, with the help of the above-mentioned technical scheme of the utility model, through the optimization and improvement design of the product of the utility model, the clamping, positioning and various shape and size accuracy of the workpiece in the process of processing it into a one-eighth sphere are effectively guaranteed and further improved, thereby achieving the technical effect of improving production efficiency, improving production quality, avoiding material waste, and saving production costs.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixture device for machining one-eighth sphere, characterized in that: The invention comprises a first clamp and a second clamp, wherein the first clamp comprises a first receiving plate (3), and the first receiving plate (3) is provided with a first main shaft (2) connected by a plurality of first bolts (1) and a first clamp body (6) connected by a plurality of first hexagon socket screws (4) on both sides thereof; The second clamp comprises a second receiving plate (13), and the second receiving plate (13) is provided with a second main shaft (12) connected by a plurality of second bolts (11) and four spherical blocks (20) connected by a plurality of second hexagon socket screws (14) on both sides, four positioning plates (15) are provided between the four spherical blocks (20) via fastening bolts (16) and positioning pins (17), and four clamping rings (22) are provided on the spherical areas of the four spherical blocks (20) via locking screws (21).

2. A fixture device for machining a one-eighth sphere according to claim 1, characterized in that: The number of the first bolts (1) and the number of the second bolts (11) are both four.

3. A fixture device for machining a one-eighth sphere according to claim 1, characterized in that: Each of the spherical blocks (20) and the positioning plates (15) are fastened to each other in pairs via two fastening bolts (16) and two positioning pins (17), and the longitudinally arranged positioning plates (15) and the transversely arranged positioning plates (15) are perpendicular to each other.

4. A fixture device for machining a one-eighth sphere according to claim 1, characterized in that: The verticality of two adjacent positioning plates (15) is 0.02 mm, and the parallelism of the planes of two adjacent positioning plates (15) and the rotation axis is 0.01 mm.

5. The fixture device for machining a one-eighth sphere according to claim 1, characterized in that: A first workpiece (7) is clamped in the first clamp body (6), and a second workpiece (18) is clamped between the clamping ring (22) and the positioning plate (15), and the number of the first workpiece (7) and the number of the second workpiece (18) are both four.

6. A fixture device for machining a one-eighth sphere according to claim 5, characterized in that: The side of the first workpiece (7) away from the first clamp body (6) abuts against the inner cone tip (8), and the side of the second workpiece (18) away from the clamping ring (22) abuts against the core shaft tip (19).

7. A fixture device for machining a one-eighth sphere according to claim 5, characterized in that: A cushion block (9) is arranged in parallel between the first receiving plate (3) and the first workpiece (7).

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