Stable clamping jig for precise metal piece

Abstract

The invention discloses a stable clamping jig for precision metal parts, which is used for workpiece processing and comprises a base plate, a carrier plate mounted above the base plate and a plurality of clamping jaws mounted on the base plate and positioned on the outer side of the carrier plate, the clamping jaw further comprises a pressing head, a supporting plate installed on the base plate, a fixed seat installed at the front end of the upper surface of the supporting plate and an air cylinder installed below the supporting plate, a movable seat is installed at the upper end of a piston rod of the air cylinder, and the pressing head arranged above the movable seat is connected with the movable seat through a rotatable second connecting rod. The upper surface of the movable seat is provided with an arched part extending upwards, and the lower surface of the joint of the pressing head and the second connecting rod is provided with an arc-shaped part arched downwards. On the basis of saving the action space of the pressure head and reducing the bonding of scraps, the pressure head is locked during clamping, stable and continuous pressure is kept, the circumferential shielding of the pressure claw is realized, and the bad interference of the scraps on the pressure claw is avoided.

Description

Technical Field

[0001] The invention relates to a stable clamping fixture for precision metal parts, and belongs to the field of electronic product processing. Background Art

[0002] The principle of CNC machining is to use the cutting tool with scientific and reasonable cutting parameters to realize the milling of holes, holes and special shapes on precision CNC machining equipment. In recent years, the development of high-performance and high-precision CNC machine tools and the emergence of excellent metal cutting tools have made CNC machining widely used in the processing of mobile phone, computer and other shells, and even in the processing of other similar metal products.

[0003] Laptop computers are one of the commonly used electronic devices in modern society. During the milling process of the laptop shell, a special fixture is usually required to clamp the laptop to ensure that the laptop shell is accurately and stably installed on the machine tool before processing it.

[0004] The clamping force of the clamping fixture of the prior art is unstable during clamping. A loose clamping force can easily cause the workpiece to deviate or shake, resulting in defective products. In addition, there is no shielding around the pressure head, which can be easily disturbed by debris generated during processing. Summary of the invention

[0005] The object of the present invention is to provide a stable clamping jig for precision metal parts. The stable clamping jig for precision metal parts can save the space for the pressure head to move and reduce the adhesion of waste chips. It can also lock the pressure head during clamping to maintain stable and continuous pressure, and can also achieve circumferential shielding of the pressure jaws to avoid adverse interference of debris on the pressure jaws.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a stable clamping fixture for precision metal parts, used for workpiece processing, comprising: a base plate, a carrier plate installed above the base plate, and a plurality of clamping jaws installed on the base plate and located outside the carrier plate, the workpiece is placed on the upper surface of the carrier plate, the lower surface of the front end of the pressure head of the clamping jaw can be connected with the workpiece for pressing, the clamping jaw further comprises: a pressure head, a support plate installed on the base plate, a fixed seat installed on the front end of the upper surface of the support plate, and a cylinder installed below the support plate, the piston rod of the cylinder passes through the support plate upward and is located at the rear side of the fixed seat, a movable seat is installed at the upper end of the piston rod, and the pressure head arranged above the fixed seat and the movable seat is connected to the fixed seat and the movable seat respectively through a rotatable first connecting rod and a second connecting rod; The other end of the first connecting rod, one end of which is rotatably connected to the fixed seat, is rotatably connected to the middle part of the pressure head; the second connecting rod, located at the rear side of the first connecting rod, has one end rotatably connected to the pressure head, and the other end rotatably connected to the rear end of the fixed seat; one end of a rotating rod is rotatably connected to the middle part of the first connecting rod, and the other end of the rotating rod is rotatably connected to the front end of the movable seat through a pin shaft; the upper surface of the movable seat has an arched portion extending upward, and the lower surface of the connection between the pressure head and the second connecting rod has an arc-shaped portion arched downward, and when the piston rod of the cylinder is in an extended state, the upper surface of the arched portion is pressed and contacted with the lower surface of the arc-shaped portion; The left and right ends of the pin shaft passing through the movable seat each extend outward and are installed with a movable baffle, and the two movable baffles are each provided with a side baffle on the side opposite to the movable seat, and at least one group of vertically extending guide grooves and guide ridges are slidably matched between the side baffles installed on the upper surface of the support plate and the corresponding movable baffles, a front baffle is provided between the two side baffles and located on the front side of the fixed seat, and a floating baffle is provided between the two movable baffles, and the floating baffle is located between the fixed seat and the front baffle, and a groove for the floating baffle to be embedded is provided on the front end surface of each of the movable baffles, and the length of the groove in the vertical direction is greater than the length of the floating baffle in the vertical direction, so that the floating baffle embedded in the groove can move in the vertical direction, and a spring is vertically provided between the lower wall of each groove and the lower surface of the floating baffle.

[0007] The further improved scheme in the above technical scheme is as follows: 1. In the above solution, the upper surface of the pressure head is an arc-shaped surface, and the middle part of the arc-shaped surface is arched upward.

[0008] 2. In the above solution, the upper surfaces of the two movable baffles are arc-shaped surfaces that bend downward.

[0009] 3. In the above solution, the upper part of the side surface of the side baffle is an arc-shaped surface continuous with the upper surface of the movable baffle.

[0010] 4. In the above solution, the arched portion is located at the front end of the movable seat.

[0011] 5. In the above solution, the front end of the area where the arched portion can be pressed and contacted with the lower surface of the arc-shaped portion is a downwardly inclined surface or an arc-shaped surface.

[0012] 6. In the above scheme, a first mounting hole is provided on the lower wall of the groove, and a second mounting hole corresponding to the first mounting hole is provided on the lower surface of the floating baffle, and the lower end and the upper end of the spring in the extruded state are correspondingly embedded in the first mounting hole and the second mounting hole.

[0013] 7. In the above solution, the first mounting hole and the second mounting hole are both blind holes.

[0014] 8. In the above scheme, a guide column is fixedly installed in the first mounting hole, the upper end of the vertically extending guide column is embedded in the second mounting hole directly above it, and the spring is sleeved on the outside of the guide column.

[0015] 9. In the above scheme, a guide hole is opened above the second mounting hole, and the inner diameter of the guide hole, which is coaxial and connected to the second mounting hole, is smaller than the inner diameter of the second mounting hole. The upper end of the guide column can be embedded in the guide hole and slide in contact with the inner wall of the guide hole.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. A stable clamping fixture for precision metal parts of the present invention, wherein one end of a first connecting rod is rotatably connected to a fixed seat, and the other end is rotatably connected to the middle part of a pressing head. One end of a second connecting rod located at the rear side of the first connecting rod is rotatably connected to the pressing head, and the other end is rotatably connected to the rear end of the fixed seat. One end of a rotating rod is rotatably connected to the middle part of the first connecting rod, and the other end of the rotating rod is rotatably connected to the front end of a movable seat through a pin shaft. The upper surface of the movable seat has an arch extending upward, and the lower surface of the connection between the pressing head and the second connecting rod has an arc-shaped portion arched downward. When the piston rod of the cylinder is in an extended state, the upper surface of the arched portion is pressed and contacted with the lower surface of the arc-shaped portion. On the basis of achieving that the pressing head always maintains a nearly horizontal state and shrinks back and forth to save the space required for the action and reduce the adhesion of waste chips, the pressing head can be locked when the pressing head is in a clamping state without reverse flipping, thereby maintaining stable and continuous pressure and avoiding the workpiece from being offset or jittered due to loose holding force during processing, resulting in product defects.

[0017] 2. The stable clamping fixture of precision metal parts of the present invention further extends outward at the left and right ends of the pin shaft passing through the movable seat and is installed with a movable baffle, and the two movable baffles are each provided with a side baffle on the side opposite to the movable seat, and at least one group of vertically extending guide grooves and guide convex strips are slidably matched between the side baffles installed on the upper surface of the support plate and the corresponding movable baffles, a front baffle is provided between the two side baffles and located on the front side of the fixed seat, and a floating baffle is provided between the two movable baffles, and the floating baffle is located between the fixed seat and the front baffle, and the front end surface of each movable baffle is provided with a groove for the floating baffle to be embedded. The length of the groove in the vertical direction is greater than the length of the floating baffle in the vertical direction, so that the floating baffle embedded in the groove can move in the vertical direction. A spring is vertically arranged between the lower wall of each groove and the lower surface of the floating baffle. Through the cooperation of the fixed side baffle, the front baffle and the movable baffle and the floating baffle, circumferential shielding is achieved during the entire contraction process of the pressure jaws, further avoiding the adverse interference of the debris generated during the processing to the pressure jaws, and the floating baffle can be kept in contact with the lower surface of the pressure head during the entire process of the pressure head pressing the workpiece upward and then slightly downward to prevent debris from flying into the shielding area.

[0018] 3. The stable clamping fixture for precision metal parts of the present invention has an upper surface of the pressure head that is an arc-shaped surface, and the middle part of the arc-shaped surface is arched upward, the upper surfaces of the two movable baffles are downwardly bent arc-shaped surfaces, and the upper part of the side surface of the side baffle is an arc-shaped surface continuous with the upper surface of the movable baffle, which can allow the flying waste chips to slide down along the arc-shaped surface, further avoiding the residue and accumulation of waste chips, and avoiding the adverse interference of waste chips on subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a schematic structural diagram of a stable clamping fixture for precision metal parts of the present invention; Attached Figure 2 It is a schematic diagram of the partial structure disassembly of the stable clamping fixture for precision metal parts of the present invention; Attached Figure 3 It is a schematic diagram of the clamping state of the clamping jaws of the stable clamping fixture for precision metal parts of the present invention; Attached Figure 4 For attachment Figure 3 Schematic diagram of the cross section along AA; Attached Figure 5 For attachment Figure 4 The enlarged schematic diagram of point B in the middle; Attached Figure 6 A schematic diagram of the stable clamping fixture for precision metal parts of the present invention in which the clamping jaws are extended; Attached Figure 7 For attachment Figure 6 Schematic diagram of the cross section along DD; Attached Figure 8 It is a schematic diagram of the non-working state of the clamping jaws of the stable clamping fixture for precision metal parts of the present invention; Attached Fig. 9 For attachment Figure 8 Schematic diagram of the cross section along the CC; Attached Fig.10 It is a schematic diagram of the partial structure of the clamping jaws of the stable clamping fixture for precision metal parts of the present invention.

[0020] In the above drawings: 100, workpiece; 200, substrate; 201, mounting bar; 300, carrier plate; 301, cavity; 302, adsorption hole; 400, clamping claw; 500, cover plate; 501, avoidance hole; 600, bottom plate; 700, support column; 1, pressure head; 2, support plate; 3, fixed seat; 4, cylinder; 5, movable seat; 61, first connecting rod; 62, second connecting rod; 7, rotating rod; 8, pin shaft; 9. movable baffle; 91. raised portion; 10. side baffle; 11. guide groove; 12. guide ridge; 13. floating baffle; 131. extension portion; 14. groove; 15. spring; 16. front baffle; 171. first mounting hole; 172. first mounting hole; 18. guide column; 181. flange portion; 19. guide hole; 20. arched portion; 21. arc-shaped portion; 22. arc-shaped groove; 23. arc-shaped groove. Implementation

[0021] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0022] Embodiment 1: A stable clamping fixture for precision metal parts, used for processing a workpiece 100, comprising: a base plate 200, a carrier plate 300 installed above the base plate 200, and a plurality of clamping jaws 400 installed on the base plate 200 and located outside the carrier plate 300, the workpiece 100 is placed on the upper surface of the carrier plate 300, the lower surface of the front end of the pressure head 1 of the clamping jaw 400 can be pressed and connected with the workpiece 100, the clamping jaw 400 further comprises: a pressure head 1, a support plate 2 installed on the base plate 200, a fixed seat 3 installed at the front end of the upper surface of the support plate 2, and a cylinder 4 installed below the support plate 2, the piston rod 41 of the cylinder 4 passes upward through the support plate 2 and is located at the rear side of the fixed seat 3, a movable seat 5 is installed at the upper end of the piston rod 41, the pressure head 1 arranged above the fixed seat 3 and the movable seat 5 is connected to the fixed seat 3 and the movable seat 5 respectively through a rotatable first connecting rod 61 and a second connecting rod 62; The first connecting rod 61, one end of which is rotatably connected to the fixed seat 3, is rotatably connected to the middle part of the pressure head 1 at the other end. The second connecting rod 62 located at the rear side of the first connecting rod 61 is rotatably connected to the pressure head 1 at one end, and is rotatably connected to the rear end of the fixed seat 3 at the other end. One end of a rotating rod 7 is rotatably connected to the middle part of the first connecting rod 61, and the other end of the rotating rod 7 is rotatably connected to the front end of the movable seat 5 through a pin shaft 8. The upper surface of the movable seat 5 has an upwardly extending arched portion 20, and the lower surface of the connection between the pressure head 1 and the second connecting rod 62 has an arc-shaped portion 21 that arches downward. When the piston rod 41 of the cylinder 4 is in an extended state, the upper surface of the arched portion 20 is pressed and contacted with the lower surface of the arc-shaped portion 21; The left and right ends of the pin shaft 8 passing through the movable seat 5 each extend outward and are installed with a movable baffle 9. The two movable baffles 9 are each provided with a side baffle 10 on the side opposite to the movable seat 5. At least one group of vertically extending guide grooves 11 and guide ridges 12 are slidably matched between the side baffles 10 installed on the upper surface of the support plate 2 and the corresponding movable baffles 9. A front baffle 16 is provided between the two side baffles 10 and located on the front side of the fixed seat 3. A floating baffle 13 is provided between the two movable baffles 9. The floating baffle 13 is located between the fixed seat 3 and the front baffle 16. The front end surface of each movable baffle 9 is provided with a groove 14 for the floating baffle 13 to be embedded. The length of the groove 14 in the vertical direction is greater than the length of the floating baffle 13 in the vertical direction, so that the floating baffle 13 embedded in the groove 14 can move in the vertical direction. A spring 15 is vertically provided between the lower wall of each groove 14 and the lower surface of the floating baffle 13. When the piston rod of the cylinder is in the retracted state: The lower surface of the movable seat is fitted with the upper surface of the support plate, and the two movable baffles that can move up and down with the pin shaft on the movable seat are respectively moved to the lowest point of their travel, so that their lower surfaces are fitted with the upper surface of the support plate, and their upper surfaces are flush with the upper surfaces of the side baffles, and the rear side surfaces of the upper protrusions are fitted with the front side surface of the support plate; The ends of the first connecting rod and the second connecting rod connected to the ram are respectively tilted backward and the first connecting rod is almost horizontal. The end of the rotating rod connected to the middle part of the first connecting rod is tilted forward. The ram is at the lowest point and rearmost of its stroke (located outside the workpiece and lower than the workpiece), and its front end surface protrudes slightly forward from the front baffle. The floating baffle, whose upper surface is in compression contact with the lower surface of the ram, is at the lowest point of its stroke under the action of the ram. At this time, the floating baffle is located above the groove and its upper surface is close to the upper wall of the groove, and the compression of the spring is minimal.

[0023] The upper surface of the pressure head is an arc-shaped surface, and the middle part of the arc-shaped surface is arched upward.

[0024] The upper surfaces of the two movable baffles 9 are arc-shaped surfaces that are bent downward.

[0025] The upper side surface of the side baffle 10 is an arc-shaped surface continuous with the upper surface of the movable baffle 9, which allows the flying waste chips to slide down along the arc-shaped surface, further avoiding the residue and accumulation of waste chips and avoiding the adverse interference of waste chips on subsequent processing.

[0026] The arched portion 20 is located at the front end of the movable seat 5 .

[0027] The front end of the region where the arched portion 20 can press and contact with the lower surface of the arc-shaped portion 21 is a downwardly inclined surface.

[0028] A first mounting hole 171 is provided on the lower wall of the groove 14, and a second mounting hole 172 corresponding to the first mounting hole 171 is provided on the lower surface of the floating baffle 13. The lower end and the upper end of the spring 15 in the extruded state are correspondingly embedded in the first mounting hole 171 and the second mounting hole 172.

[0029] The first mounting hole 171 and the second mounting hole 172 are both blind holes.

[0030] A guide column 18 is fixedly installed in the first mounting hole 171 . The upper end of the vertically extending guide column 18 is embedded in the second mounting hole 172 just above it. The spring 15 is sleeved on the outer side of the guide column 18 .

[0031] A guide hole 19 is opened above the second mounting hole 172. The inner diameter of the guide hole 19, which is coaxial and connected to the second mounting hole 172, is smaller than the inner diameter of the second mounting hole 172. The upper end of the guide column 18 can be embedded in the guide hole 19 and slide in contact with the inner wall of the guide hole 19.

[0032] Embodiment 2: A stable clamping fixture for precision metal parts, used for processing a workpiece 100, comprising: a base plate 200, a carrier plate 300 installed above the base plate 200, and a plurality of clamping jaws 400 installed on the base plate 200 and located outside the carrier plate 300, the workpiece 100 is placed on the upper surface of the carrier plate 300, the lower surface of the front end of the pressure head 1 of the clamping jaw 400 can be pressed and connected with the workpiece 100, the clamping jaw 400 further comprises: a pressure head 1, a support plate 2 installed on the base plate 200, a fixed seat 3 installed at the front end of the upper surface of the support plate 2, and a cylinder 4 installed below the support plate 2, the piston rod 41 of the cylinder 4 passes upward through the support plate 2 and is located at the rear side of the fixed seat 3, a movable seat 5 is installed at the upper end of the piston rod 41, the pressure head 1 arranged above the fixed seat 3 and the movable seat 5 is connected to the fixed seat 3 and the movable seat 5 respectively through a rotatable first connecting rod 61 and a second connecting rod 62; The first connecting rod 61, one end of which is rotatably connected to the fixed seat 3, is rotatably connected to the middle part of the pressure head 1 at the other end. The second connecting rod 62 located at the rear side of the first connecting rod 61 is rotatably connected to the pressure head 1 at one end, and is rotatably connected to the rear end of the fixed seat 3 at the other end. One end of a rotating rod 7 is rotatably connected to the middle part of the first connecting rod 61, and the other end of the rotating rod 7 is rotatably connected to the front end of the movable seat 5 through a pin shaft 8. The upper surface of the movable seat 5 has an upwardly extending arched portion 20, and the lower surface of the connection between the pressure head 1 and the second connecting rod 62 has an arc-shaped portion 21 that arches downward. When the piston rod 41 of the cylinder 4 is in an extended state, the upper surface of the arched portion 20 is pressed and contacted with the lower surface of the arc-shaped portion 21; In the first stage of the upward extension of the cylinder's piston rod: The movable seat moves upward in the vertical direction away from the support plate, thereby driving the first connecting rod, the second connecting rod, one end connected to the pressure head, and the end of the rotating rod connected to the middle of the first connecting rod to rotate forward until the first connecting rod is close to a vertical state and the rotating rod is close to a horizontal state, and the pin shaft on the movable seat drives the two movable baffles to move upward, and under the limiting action of the guide groove and the guide convex strip, the movable baffle only moves up in the vertical direction relative to the side baffle and further squeezes the spring; In the second stage when the piston rod of the cylinder continues to extend upward: The movable seat continues to move upward a small distance in the vertical direction until the piston rod reaches the upper limit of the stroke. During this process, the rear end of the pressure head rotates upward under the action of the arched portion on the movable seat, while the front end of the pressure head rotates downward until the lower surface of the front end of the pressure head presses the workpiece; When the front end of the pressure head rotates downward, the floating baffle plate embedded in the arc-shaped groove on the lower surface of the pressure head moves downward a small distance under the action of the pressure head and further compresses the spring. At this time, the floating baffle plate, whose upper part is still embedded in the arc-shaped groove, is located at the lower part of the groove and its lower surface is close to the lower wall of the groove. The left and right ends of the pin shaft 8 passing through the movable seat 5 each extend outward and are installed with a movable baffle 9. The two movable baffles 9 are each provided with a side baffle 10 on the side opposite to the movable seat 5. At least one group of vertically extending guide grooves 11 and guide ridges 12 are slidably matched between the side baffles 10 installed on the upper surface of the support plate 2 and the corresponding movable baffles 9. A front baffle 16 is provided between the two side baffles 10 and located on the front side of the fixed seat 3. A floating baffle 13 is provided between the two movable baffles 9. The floating baffle 13 is located between the fixed seat 3 and the front baffle 16. A groove 14 is provided on the front end surface of each movable baffle 9 for the floating baffle 13 to be embedded. The length of the groove 14 in the vertical direction is greater than the length of the floating baffle 13 in the vertical direction, so that the floating baffle 13 embedded in the groove 14 can move in the vertical direction. A spring 15 is vertically provided between the lower wall of each groove 14 and the lower surface of the floating baffle 13.

[0033] The front end of the region where the arched portion 20 can press and contact with the lower surface of the arc-shaped portion 21 is an arc-shaped surface; The pressing head moves upward and forward under the joint action of the first connecting rod and the second connecting rod until it is above the workpiece, and there is a gap between the lower surface of the front end of the pressing head and the upper surface of the workpiece, while the upper surface of the arched part on the movable seat has no pressure contact with the lower surface of the arc-shaped part on the pressing head.

[0034] A first mounting hole 171 is provided on the lower wall of the groove 14, and a second mounting hole 172 corresponding to the first mounting hole 171 is provided on the lower surface of the floating baffle 13. The lower end and the upper end of the spring 15 in the extruded state are correspondingly embedded in the first mounting hole 171 and the second mounting hole 172.

[0035] A guide column 18 is fixedly installed in the first mounting hole 171 . The upper end of the vertically extending guide column 18 is embedded in the second mounting hole 172 just above it. The spring 15 is sleeved on the outer side of the guide column 18 .

[0036] A guide hole 19 is opened above the second mounting hole 172. The inner diameter of the guide hole 19, which is coaxial and connected to the second mounting hole 172, is smaller than the inner diameter of the second mounting hole 172. The upper end of the guide column 18 can be embedded in the guide hole 19 and slide in contact with the inner wall of the guide hole 19.

[0037] The guide column 18 has a flange portion 181 extending radially outward at its lower end, and the lower end of the spring 15 is in press contact with the upper surface of the flange portion 181 .

[0038] The lower surface of the front baffle plate 16 is lower than the upper surface of the support plate 2 .

[0039] The left and right ends of the front baffle 16 are fixedly connected to the corresponding side baffle 10 by at least two screws respectively.

[0040] One end of the rotating rod 7 connected to the first connecting rod 61 is cylindrical, and the upper surface of the fixing seat 3 is provided with an arc groove 22 that is in sliding contact with the rotating rod 7 .

[0041] The floating baffle 13 has a downwardly extending portion 131 at the center of the lower surface thereof. The extending portion 131 is in sliding contact with two movable baffles 9 located on both sides thereof.

[0042] The front end of each lower surface of the two movable baffles 9 has a convex portion 91 extending downward, and the convex portion 91 is located outside the support plate 2 .

[0043] The upper surface of the floating baffle 13 is an arc-shaped surface that arches upward, and the lower surface of the pressure head 1 is provided with an arc-shaped groove 23 for the upper part of the floating baffle 13 to be embedded; At the moment the pressure head moves upward, the floating baffle that loses its stop limit moves upward under the action of the spring and always keeps in contact with the lower surface of the pressure head until the upper part of the floating baffle is embedded in the arc-shaped groove on the lower surface of the pressure head. At this time, the floating baffle is located in the middle of the groove, and the upper surface of the movable baffle is almost flush with the upper surface of the middle part of the pressure head.

[0044] The workpiece 100 is a notebook computer housing.

[0045] The lower surface of the front end of the pressing head 1 can be pressed and contacted with the upper surface of the workpiece 100 .

[0046] The front end of the upper surface of the pressure head 1 is a downwardly inclined slope.

[0047] There are two first connecting rods 61 and two second connecting rods 62 , respectively, and both are symmetrically arranged on both sides of the pressure head 1 .

[0048] The two first connecting rods 61 are respectively located on both sides of the fixed seat 3 , and the two second connecting rods 62 are respectively located on both sides of the movable seat 5 .

[0049] The two ends of the first connecting rod 61 are rotatably connected to the upper part of the fixed seat 3 and the pressure head 1 through a pin shaft, the two ends of the second connecting rod 62 are rotatably connected to the movable seat 5 and the pressure head 1 through a pin shaft, and the rotating rod 7 is rotatably connected to the first connecting rod 61 through a pin shaft.

[0050] The above also has a cover plate 500 disposed directly above the carrier plate 300, the lower surface of the cover plate 500 can be in contact with the upper surface of the workpiece 100, when the workpiece 100 is in a processing state, the lower surface of the front end of the pressure head 1 of the clamping jaw 400 is in pressure holding contact with the upper surface of the cover plate 500; Place each pressing jaw in a state of being retracted backward and downward, so that the pressing head of each pressing jaw is located outside the carrier plate and lower than the carrier plate; Then place the workpiece to be processed on the carrier plate and perform preliminary positioning on the workpiece, and place the cover plate on top of the workpiece to press the workpiece; At the same time, the piston rod of the cylinder in each clamp is driven to move upward, driving the corresponding pressure head to press the cover plate upward and forward, thereby achieving the pressing and positioning of the workpiece for subsequent milling processing.

[0051] The cover plate 500 is provided with a plurality of avoidance holes 501 for the processing head to pass through.

[0052] The clamping jaws 400 are provided in eight numbers.

[0053] The carrier plate 300 has a cavity 301 therein, and the cavity 301 communicated with the vacuum generator is communicated with the adsorption holes 302 opened on the upper surface of the carrier plate 300 .

[0054] A bottom plate 600 is disposed below the substrate 200 , and the upper surface of the bottom plate 600 is connected to the lower surface of the substrate 200 via at least three supporting columns 700 .

[0055] One supporting column 700 is disposed between any two adjacent clamping jaws 400 .

[0056] The carrier plate 300 is installed in the central area above the substrate 200 , and a plurality of the clamping claws 400 are arranged at intervals around the carrier plate 300 .

[0057] A clamping claw 400 is disposed on the outer side of each of the four corners of the carrier plate 300 .

[0058] The lower surface of the support plate 2 and the upper surface of the base plate 200 are connected via mounting bars 201 respectively disposed on both sides of the cylinder 4 .

[0059] The working principle of the present invention is as follows: First, each pressing claw is placed in a state of being retracted backward and downward, so that the pressing head of each pressing claw is located outside the carrier plate and lower than the carrier plate; Then place the workpiece to be processed on the carrier plate and perform preliminary positioning on the workpiece, and place the cover plate on top of the workpiece to press the workpiece; At the same time, the piston rod of the cylinder in each clamp is driven to move upward, driving the corresponding pressure head to press the cover plate upward and forward, thereby achieving the pressing and positioning of the workpiece for subsequent milling processing.

[0060] When the piston rod of the cylinder is in the retracted state: The lower surface of the movable seat is fitted with the upper surface of the support plate, and the two movable baffles that can move up and down with the pin shaft on the movable seat are respectively moved to the lowest point of their travel, so that their lower surfaces are fitted with the upper surface of the support plate, and their upper surfaces are flush with the upper surfaces of the side baffles, and the rear side surfaces of the upper protrusions are fitted with the front side surface of the support plate; The ends of the first connecting rod and the second connecting rod connected to the ram are respectively tilted backward and the first connecting rod is almost horizontal. The end of the rotating rod connected to the middle part of the first connecting rod is tilted forward. The ram is at the lowest point and rearmost of its stroke (located outside the workpiece and lower than the workpiece), and its front end surface protrudes slightly forward from the front baffle. The floating baffle, whose upper surface is in compression contact with the lower surface of the ram, is at the lowest point of its stroke under the action of the ram. At this time, the floating baffle is located above the groove and its upper surface is close to the upper wall of the groove, and the compression of the spring is minimal.

[0061] In the first stage of the upward extension of the cylinder's piston rod: The movable seat moves upward in the vertical direction away from the support plate, thereby driving the first connecting rod, the second connecting rod, one end connected to the pressure head, and the end of the rotating rod connected to the middle of the first connecting rod to rotate forward until the first connecting rod is close to a vertical state and the rotating rod is close to a horizontal state, and the pin shaft on the movable seat drives the two movable baffles to move upward, and under the limiting action of the guide groove and the guide convex strip, the movable baffle only moves up in the vertical direction relative to the side baffle and further squeezes the spring; During this process, the pressing head moves upward and forward under the joint action of the first connecting rod and the second connecting rod until it is above the workpiece, and there is a gap between the lower surface of the front end of the pressing head and the upper surface of the workpiece, while the upper surface of the arched part on the movable seat and the lower surface of the arc-shaped part of the pressing head have no pressure contact; At the moment the pressure head moves upward, the floating baffle that loses its stop limit moves upward under the action of the spring and always keeps in contact with the lower surface of the pressure head until the upper part of the floating baffle is embedded in the arc-shaped groove on the lower surface of the pressure head. At this time, the floating baffle is located in the middle of the groove, and the upper surface of the movable baffle is almost flush with the upper surface of the middle part of the pressure head.

[0062] In the second stage when the piston rod of the cylinder continues to extend upward: The movable seat continues to move upward a small distance in the vertical direction until the piston rod reaches the upper limit of the stroke. During this process, the rear end of the pressure head rotates upward under the action of the arched portion on the movable seat, while the front end of the pressure head rotates downward until the lower surface of the front end of the pressure head presses the workpiece; When the front end of the pressure head rotates downward, the floating baffle plate embedded in the arc-shaped groove on the lower surface of the pressure head moves downward a small distance under the action of the pressure head and further compresses the spring. At this time, the floating baffle plate whose upper part is still embedded in the arc-shaped groove is located at the lower part of the groove and its lower surface is close to the lower wall of the groove.

[0063] When the above-mentioned stable clamping fixture for precision metal parts is used, the ram can be locked when it is in a clamping state without reverse flipping, based on the fact that the ram can always remain in a nearly horizontal state and retract back and forth to save space required for the action and reduce the adhesion of waste chips. The stable and continuous pressure is avoided to avoid the workpiece from being offset or jittered due to loose holding force during processing, resulting in defective products. In addition, circumferential shielding is achieved during the entire contraction process of the pressure jaws through the cooperation of the fixed side baffles, front baffles and the movable baffles and floating baffles, further avoiding the adverse interference of the pressure jaws by the chips generated during the processing, and the floating baffle can be kept in contact with the lower surface of the ram to prevent chips from flying into the shielding area during the entire process of the ram pressing the workpiece upward and then slightly downward.

[0064] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A stable clamping fixture for precision metal parts, used for processing a workpiece (100), comprising: A substrate (200), a carrier plate (300) mounted above the substrate (200), and a plurality of clamping jaws (400) mounted on the substrate (200) and located outside the carrier plate (300), wherein the workpiece (100) is placed on the upper surface of the carrier plate (300), and the lower surface of the front end of the pressure head (1) of the clamping jaw (400) can be pressed and connected with the workpiece (100), and the clamping jaw (400) further comprises: a pressure head (1), a support plate (2) mounted on the substrate (200), and a mounting plate (300). A fixed seat (3) at the front end of the upper surface of the support plate (2) and a cylinder (4) installed below the support plate (2), a piston rod (41) of the cylinder (4) passing through the support plate (2) upward and being located at the rear side of the fixed seat (3), a movable seat (5) being installed at the upper end of the piston rod (41), and the pressure head (1) arranged above the fixed seat (3) and the movable seat (5) being connected to the fixed seat (3) and the movable seat (5) respectively through a rotatable first connecting rod (61) and a second connecting rod (62); The invention is characterized in that: one end of the first connecting rod (61) is rotatably connected to the fixed seat (3), and the other end is rotatably connected to the middle part of the pressure head (1); one end of the second connecting rod (62) located at the rear side of the first connecting rod (61) is rotatably connected to the pressure head (1), and the other end is rotatably connected to the rear end of the fixed seat (3); one end of a rotating rod (7) is rotatably connected to the middle part of the first connecting rod (61), and the other end of the rotating rod (7) is rotatably connected to the front end of the movable seat (5) through a pin shaft (8); the upper surface of the movable seat (5) has an upwardly extending arched portion (20); the lower surface of the connection between the pressure head (1) and the second connecting rod (62) has a downwardly arched arc portion (21); when the piston rod (41) of the cylinder (4) is in an extended state, the upper surface of the arched portion (20) is in contact with the lower surface of the arc portion (21); The left and right ends of the pin shaft (8) passing through the movable seat (5) each extend outward and are provided with a movable baffle (9), and the two movable baffles (9) are each provided with a side baffle (10) on the side opposite to the movable seat (5), and at least one set of vertically extending guide grooves (11) and guide ridges (12) are slidably engaged between the side baffles (10) installed on the upper surface of the support plate (2) and the corresponding movable baffles (9), and a front baffle (16) is provided between the two side baffles (10) and located on the front side of the fixed seat (3), and the two movable baffles (9) are provided with a plurality of guide grooves (11) and a plurality of guide ridges (12) extending vertically from the side baffles (10) and the ... A floating baffle (13) is arranged between the fixed seat (3) and the front baffle (16); the front end surface of each movable baffle (9) is provided with a groove (14) for the floating baffle (13) to be embedded; the length of the groove (14) in the vertical direction is greater than the length of the floating baffle (13) in the vertical direction, so that the floating baffle (13) embedded in the groove (14) can move in the vertical direction; and a spring (15) is vertically arranged between the lower wall of each groove (14) and the lower surface of the floating baffle (13).

2. The stable clamping fixture for precision metal parts according to claim 1 is characterized in that: The upper surface of the pressure head (1) is an arc-shaped surface, and the middle part of the arc-shaped surface is arched upwards.

3. The stable clamping fixture for precision metal parts according to claim 1 or 2, characterized in that: The upper surfaces of the two movable baffles (9) are arc-shaped surfaces that bend downward.

4. The stable clamping fixture for precision metal parts according to claim 3 is characterized in that: The upper portion of the side surface of the side baffle (10) is an arc-shaped surface continuous with the upper surface of the movable baffle (9).

5. The stable clamping fixture for precision metal parts according to claim 1 is characterized in that: The arched portion (20) is located at the front end of the movable seat (5).

6. The stable clamping fixture for precision metal parts according to claim 1, characterized in that: The front end of the area where the arched portion (20) can press and contact with the lower surface of the arc-shaped portion (21) is a downward sloping surface or an arc-shaped surface.

7. The stable clamping fixture for precision metal parts according to claim 1 is characterized in that: A first mounting hole (171) is provided on the lower wall of the groove (14), and a second mounting hole (172) corresponding to the first mounting hole (171) is provided on the lower surface of the floating baffle (13), and the lower end and the upper end of the spring (15) in the extruded state are correspondingly embedded in the first mounting hole (171) and the second mounting hole (172).

8. The stable clamping fixture for precision metal parts according to claim 7, characterized in that: The first mounting hole (171) and the second mounting hole (172) are both blind holes.

9. The stable clamping fixture for precision metal parts according to claim 7, characterized in that: A guide column (18) is fixedly mounted in the first mounting hole (171), the upper end of the vertically extending guide column (18) is embedded in the second mounting hole (172) directly above it, and the spring (15) is sleeved on the outside of the guide column (18).

10. The stable clamping fixture for precision metal parts according to claim 8, characterized in that: A guide hole (19) is opened above the second mounting hole (172); the inner diameter of the guide hole (19) which is coaxial with and connected to the second mounting hole (172) is smaller than the inner diameter of the second mounting hole (172); the upper end of the guide column (18) can be embedded in the guide hole (19) and is in sliding contact with the inner wall of the guide hole (19).

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