Tool suitable for clamping small hollow frame type workpiece

Abstract

The invention relates to a tool suitable for clamping a small hollow frame type workpiece, and belongs to the technical field of workpiece clamping devices. A frame-shaped workpiece to which the tool is applicable is provided with a quadrilateral frame and a middle rib which is positioned in the middle of the quadrilateral and is connected with two opposite frames; the tool comprises a square seat block arranged on a seat leg; symmetrical notch grooves are formed in the four edges of the top face of the seat block, and clamp assemblies are fixedly arranged on the top face of the seat block. And a through hole is formed in the middle of the seat block and is provided with a clamping jaw assembly in a penetrating manner. According to the tool, the clamping jaw assemblies are used for clamping middle ribs of the frame-shaped workpiece while the clamping jaw assemblies are used for clamping the four side frames of the frame-shaped workpiece, and therefore the frame-shaped workpiece is clamped more firmly; and in addition, the middle ribs of the frame-shaped workpieces distributed in different numbers and positions can be firmly clamped.

Description

Technical Field

[0001] The invention relates to a mechanical processing rapid clamping and positioning device, in particular to a special process device suitable for clamping a frame-type workpiece, belonging to the technical field of workpiece clamping devices (B25B 11 / 00). Background Art

[0002] At present, more and more products with complex structures and irregular surfaces need to be realized through CNC machining technology; therefore, higher requirements are placed on the clamping equipment for machining of products. For example, for some small frame-type workpieces, the frame is mostly hollowed out with a small space and has some ribs or ribs, and the plane of the workpiece needs to be machined to ensure flatness and smoothness; 1) The traditional clamp-type fixture can only clamp it around, which cannot ensure a firm clamp, and may even lead to the risk of dimensional deviation and scrap during product processing; 2) The existing tire seat is set in the hollow cavity of the frame workpiece to clamp the workpiece, but this method is segmented processing, which is prone to joint marks and the flatness of machining is difficult to ensure; 3) When using the existing internal support tooling, the workpiece surface needs to be leveled by adjusting the internal support height during clamping. Due to the influence of the ribs at the hollow part of the frame workpiece, the clamping and alignment time is long, which affects the processing efficiency, and multiple plane machining has to be performed; and so on. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to enable special workpieces such as frame-type workpieces to be firmly clamped during CNC machining and to achieve high-quality plane machining of the workpiece in one go.

[0004] In order to solve the above technical problems, the technical solution proposed by the present invention is: a tool suitable for clamping a small hollow frame-shaped workpiece, the frame-shaped workpiece has four quadrilateral frames and a middle rib connecting two opposite frames at the hollowed-out middle of the quadrilateral; its characteristics are: the tool comprises a seat block with a quadrilateral top surface arranged on the seat legs, the seat legs are arranged on both sides of the bottom of the seat block to form two opposite to each other, and a gap is formed between the two seat legs; the four sides of the top surface of the seat block are made with symmetrical notch grooves, and a clamp assembly is fixed in the notch groove; the middle part of the seat block is made with a through hole, and a clamping claw assembly is installed in the hole; The clamp assembly comprises an adjusting bolt and a top block which are threadedly connected to each other, one side of the top block abuts against the inner end surface of the notch groove, and a clamping opening is formed between the other side of the top block and the inner end surface of the adjusting bolt; The clamping jaw assembly comprises a pair of clamping jaw rods, a pair of connecting rods, a pair of clamping jaw seats and a cylinder, wherein the clamping jaw seats are fixed to the top surface of the seat block, the cylinder body of the cylinder is fixed to the bottom surface of the seat block, and a connecting block is sleeved on the telescopic rod of the cylinder; one end of the clamping jaw rod is formed with a clamping jaw and is hinged to the clamping jaw seat, and the other end is hinged to one end of the connecting rod; the other end of the connecting rod is hinged to the connecting block; When in use, the frame-shaped workpiece is placed on the seat block, the four sides of the frame-shaped workpiece are inserted into the clamping mouth, the claws at one end of the pair of claw rods extend out of the top surface of the seat block, and the middle rib of the frame-shaped workpiece is inserted between a pair of claws at one end of a pair of claw rods.

[0005] The beneficial effects of the present invention are as follows: 1) by rotating the adjusting bolt, the inner end face of the adjusting bolt and the other side face of the top block clamp the four sides of the frame-type workpiece, and by the cylinder rising, the telescopic rod drives the connecting rod to rotate, so that a pair of clamping claw rods rotate close to each other to clamp the middle rib of the frame-type workpiece; the pneumatic clamping claw assembly uses the cavity between the seat legs to accommodate the cylinder, and uses the hole made in the middle of the seat block to wear the clamping claw rod and the connecting rod and other rotating parts, which cleverly solves the problem of clamping the middle rib of the narrow hollow in the middle of the frame-type workpiece; in this way, both the four sides of the frame-type workpiece and the middle rib of the frame-type workpiece are clamped, so that the narrow hollow frame-type workpiece is clamped more firmly. 2) Since the clamp assembly and the clamping claw assembly only contact the four sides and the middle rib of the clamped frame-type workpiece, and do not contact the plane of the frame-type workpiece that needs to be machined, after being clamped firmly, the plane machining of the frame-type workpiece can be completed with high quality at one time (flatness and finish are guaranteed). 3) In addition, it can also adapt to the changes in the number and position distribution of the middle ribs of different frame-type workpieces, so that the clamping jaw assembly can firmly clamp the middle ribs of frame-type workpieces with different numbers and position distributions.

[0006] Furthermore, the diameter of the hole is larger than the maximum outer dimension of the clamping jaw assembly.

[0007] Furthermore, there are eight notch grooves distributed along the four sides of the top surface of the seat block and eight clamp assemblies are fixedly installed; there are four groups of holes and four sets of clamp assemblies are respectively installed.

[0008] Furthermore, the middle ribs of the frame-type workpiece are three ribs connecting a frame and an opposite frame, which are two oblique middle ribs and a straight middle rib located between the two oblique middle ribs. One end of each of the three middle ribs is combined to connect the middle part of a frame, the other end of the straight middle rib is connected to the middle part of the opposite frame, and the other ends of each of the two oblique middle ribs are respectively connected to two corners of the opposite frame.

[0009] Furthermore, the middle rib of the frame-shaped workpiece is a straight middle rib; one end of the straight middle rib is connected to the middle of one frame, and the other end is connected to the middle of the opposite frame.

[0010] Furthermore, the middle ribs of the frame-shaped workpiece are two oblique middle ribs; one end of each of the two oblique middle ribs is combined to connect the middle part of a frame, and the other end is respectively connected to two corners of the opposite frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of the tooling for clamping a small hollow frame-shaped workpiece in the first embodiment of the present invention when clamping a first frame-shaped workpiece; Figure 2 yes Figure 1 A top view of Figure 3 yes Figure 2 Middle AA section view; Figure 4 yes Figure 2 A schematic diagram of the top view of the seat block decomposed from FIG. Figure 5 yes Figure 3 A schematic diagram of the structure of a clamp assembly exploded in FIG. Figure 6 yes Figure 3 Schematic diagram of the structure of a gripper assembly exploded.

[0012] Figure 7 It is a top view of the second embodiment of the tooling for clamping a small hollow frame-shaped workpiece when clamping a second frame-shaped workpiece.

[0013] Figure 8 Embodiment 3 is a top view of a tooling device for clamping a small hollow frame-shaped workpiece when clamping a third type of frame-shaped workpiece. DETAILED DESCRIPTION Embodiment 1

[0014] The tooling of this embodiment is suitable for clamping a small hollow frame-shaped workpiece, and a frame-shaped workpiece 4 to be processed is suitable for Figure 1 , Figure 2 As shown, the frame-type workpiece 4 to be processed has four quadrilateral side frames 4-1, 4-2, 4-3 and 4-4, and an intermediate rib located in the middle of the quadrilateral and connecting two opposite side frames 4-1 and 4-3. The intermediate ribs are three ribs connecting one side frame 4-1 and the opposite side frame 4-3, which are two oblique intermediate ribs 4-5 and a straight intermediate rib 4-7 located in the middle of the two oblique intermediate ribs 4-5 and 4-6. One end of each of the three intermediate ribs 4-5, 4-6 and 4-7 is combined to connect the middle part of one side frame 4-1, wherein the other end of the straight intermediate rib 4-7 is connected to the middle part of the opposite side frame 4-3, and the other ends of each of the two oblique intermediate ribs 4-5 and 4-6 are connected to two corners of the opposite side frame 4-3.

[0015] The tooling for clamping a frame-type workpiece in this embodiment is as follows: Figure 1 , Figure 2 and Figure 3As shown, it includes a square seat block 2 arranged on a seat leg 1, the top surface of the seat block 2 is a quadrilateral, the seat legs 1 are arranged on both sides of the bottom of the seat block 2 to form two seat legs 1 opposite to each other, and a gap is formed between the two seat legs 1; the four sides of the top surface of the seat block 2 are made with symmetrical notch grooves 3, and clamp assemblies 5 are fixed in the notch grooves 3; in this embodiment, eight notch grooves 3 (two on each side and symmetrical in pairs) are distributed along the four sides of the top surface of the seat block 3, and eight clamp assemblies 5 (two on each side and symmetrical in pairs) are fixed in the corresponding eight notch grooves 3. The side of the seat leg 1 is slotted and can be fixed with a machine tool pressure plate, and the top of the seat leg 1 is provided with a mounting hole to be fixed to the seat block 2 through bolts.

[0016] like Figure 3 and Figure 4 As shown, the middle of the seat block 2 is formed with a through hole 6, and the hole 6 is penetrated by a clamping jaw assembly 7. The diameter of the hole 6 should be larger than the maximum outer dimension of the clamping jaw assembly 7 when it is unfolded. In this embodiment, the middle of the seat block 2 is formed with four groups of holes 6 and four sets of clamping jaw assemblies 7 are respectively penetrated. Figure 2 As shown, among the four sets of clamping jaw assemblies 7 of this embodiment, two sets of clamping jaw assemblies 7 located on both sides of the seat block 2 are respectively used to clamp the two oblique middle ribs 4-5 and 4-6, and the other two sets of clamping jaw assemblies 7 located in the middle of the seat block 2 are used to clamp the straight middle rib 4-7, which can form a strong clamping on the middle part of the frame-type workpiece 4 to form a better supporting effect during processing.

[0017] like Figure 3 and Figure 5 As shown, each clamp assembly 5 includes an adjusting bolt 5-1 and a top block 5-2 which are threadedly connected in sequence from the outside to the inside. One side surface of the top block 5-2 abuts against the inner end surface of the notch groove 3, and a clamping opening 5-3 is formed between the other side surface of the top block 5-2 and the inner end surface of the adjusting bolt 5-1. The other side surface of the top block 5-2 and the inner end surface of the bolt 5-1 constitute two opposite surfaces of the clamping opening 5-3.

[0018] like Figure 6 As shown, each set of clamping jaw assembly 7 includes a pair of clamping jaw rods 7-1, a pair of connecting rods 7-2, a pair of clamping jaw seats 7-3 and a cylinder 7-4. The clamping jaw seats 7-3 are fixed to the top surface of the seat block 2, the cylinder body of the cylinder 7-4 is fixed to the bottom surface of the seat block 2, and a connecting block 7-5 is sleeved on the telescopic rod 7-4-1 of the cylinder 7-4; one end of the clamping jaw rod 7-1 is formed with a clamping jaw and is hinged to the clamping jaw seat 7-3 through a pin 7-6, and the other end of the clamping jaw rod 7-1 is hinged to one end of the connecting rod 7-2 through a pin 7-7; the other end of the connecting rod 7-2 is hinged to the connecting block 7-5 through a pin 7-8. Figure 3 As shown, the lower half of the clamping jaw assembly 7 (mainly the cylinder body of the cylinder 7-4) is accommodated in the gap between the two seat legs 1. The middle hole 6 of the seat block 2 is finely processed to install the positioning surface and the avoidance groove, and the clamping jaw assembly 7 is fixedly connected with bolts.

[0019] like Figure 1 and Figure 2 As shown, when in use, the frame-shaped workpiece 4 to be processed is placed on the top surface of the seat block 2, with the plane of the frame-shaped workpiece 4 to be machined facing upward, and the four sides of the frame-shaped workpiece 4 are clamped into the clamping opening 5-3 between the adjusting bolt 5-1 and the top block 5-2 of the clamp assembly 5, and the middle rib of the frame-shaped workpiece 4 is placed between a pair of clamping claw rods 7-1 of the clamp assembly 7. First, by fine-tuning the distance between the top block 5-2 and the adjusting bolt 5-1, that is, adjusting the caliber of the clamping opening 5-3, the clamp assembly can adjust the clamping degree of the four sides of the frame-shaped workpiece 4, and the clamping of the four sides of the frame-shaped workpiece 4 can be loosened after increasing the distance between the adjusting bolt 5-1 and the top block 5-2. 2. 1) When the cylinder 7-4 is turned on, the telescopic rod 7-4-1 of the cylinder 7-4 drives the connection block 7-5 to rise, the connecting rod 7-2 rotates forward and rises, and the pair of clamping claws 7-1 also rotates forward and approaches relatively under the drive of the forward rotation of the connecting rod 7-2, and the pair of clamping claws at one end of each pair of clamping claws 7-1 clamp the three middle ribs 4-5, 4-6 and 4-7 of the frame-shaped workpiece 4 respectively. 2) When the cylinder 7-4 is closed, the telescopic rod 7-4-1 of the cylinder 7-4 drives the connection block 7-5 to descend, the connecting rod 7-2 descends in the opposite direction, and the pair of clamping claws 7-1 also rotates in the opposite direction and moves away from each other under the drive of the reverse rotation of the connecting rod 7-2, and the pair of clamping claws at one end of each pair of clamping claws 7-1 release the clamping of the three middle ribs 4-5, 4-6 and 4-7 of the frame-shaped workpiece 4.

[0020] Practice has shown that this embodiment realizes automatic alignment, clamping and loosening of the irregular frame-shaped workpiece 4, so the clamping is very accurate, convenient and reliable, which can ensure the processing dimensional accuracy and surface quality requirements, and significantly improve the clamping efficiency during production. Embodiment 2

[0021] This embodiment is a variation of the first embodiment, mainly in that the frame-shaped workpiece 4 to be processed is changed. The tooling for clamping a small hollow frame-shaped workpiece in this embodiment clamps a second frame-shaped workpiece 4, and the middle rib of the second frame-shaped workpiece 4 has only one straight middle rib 4-7. Figure 7 As shown, one end of the linear middle rib is connected to the middle of one frame 4-1, and the other end is connected to the middle of the opposite frame 4-3. It is only necessary to use the upper and lower sets of clamping jaw assemblies 7 in the middle of the seat block 2 to clamp the linear middle rib 4-7. Embodiment 3

[0022] This embodiment is another variation based on the first embodiment. The tooling for clamping a small hollow frame-shaped workpiece in this embodiment clamps a third frame-shaped workpiece 4, and the middle ribs of the third frame-shaped workpiece 4 have only two oblique middle ribs 4-5 and 4-6. As shown in Figure 8, one end of each of the two oblique middle ribs is combined to connect the middle of a frame 4-1, and the other end is respectively connected to the two corners of the opposite frame 4-3. It is only necessary to use two sets of clamping jaw assemblies 7 on both sides of the seat block 2 to clamp the two oblique middle ribs 4-5 and 4-6 respectively.

[0023] In addition to the above-mentioned embodiments, the present invention may also have other implementation modes, and the technical solutions formed by equivalent replacement or equivalent transformation all fall within the protection scope required by the present invention.

Claims

1. A tooling for clamping a small hollow frame-shaped workpiece, wherein the frame-shaped workpiece has four quadrilateral frames and a middle rib connecting two opposite frames at the middle hollow of the quadrilateral; wherein: The tooling comprises a seat block with a quadrilateral top surface arranged on the seat legs, the seat legs are arranged on both sides of the bottom of the seat block to form two opposite legs, and a gap is formed between the two seat legs; the top surface of the seat block is formed with symmetrical notches on the four sides, and a clamp assembly is fixed in the notch; the middle part of the seat block is formed with a through hole, and a clamp assembly is installed in the hole; The clamp assembly comprises an adjusting bolt and a top block which are threadedly connected to each other, one side of the top block abuts against the inner end surface of the notch groove, and a clamping opening is formed between the other side of the top block and the inner end surface of the adjusting bolt; The clamping jaw assembly comprises a pair of clamping jaw rods, a pair of connecting rods, a pair of clamping jaw seats and a cylinder, wherein the clamping jaw seats are fixed to the top surface of the seat block, the cylinder body of the cylinder is fixed to the bottom surface of the seat block, and a connecting block is sleeved on the telescopic rod of the cylinder; one end of the clamping jaw rod is hinged to the clamping jaw seat, and the other end is hinged to one end of the connecting rod; the other end of the connecting rod is hinged to the connecting block; When in use, the frame-shaped workpiece is placed on the seat block, the four sides of the frame-shaped workpiece are inserted into the clamping mouth, the claws at one end of the pair of claw rods extend out of the top surface of the seat block, and the middle rib of the frame-shaped workpiece is inserted between a pair of claws at one end of a pair of claw rods.

2. The tooling for clamping small hollow frame-shaped workpieces according to claim 1 is characterized in that: The diameter of the hole is larger than the maximum outer dimension of the clamping jaw assembly.

3. The tooling for clamping small hollow frame-shaped workpieces according to claim 1 or 2, characterized in that: There are eight notch grooves distributed along the four sides of the top surface of the seat block and eight clamp assemblies are fixedly arranged thereon; there are four groups of holes and four sets of clamp assemblies are respectively installed thereon.

4. The tooling for clamping small hollow frame-shaped workpieces according to claim 3 is characterized by: The middle ribs of the frame-shaped workpiece are three ribs connecting a frame and an opposite frame, which are two oblique middle ribs and a straight middle rib located between the two oblique middle ribs. One end of each of the three middle ribs is combined to connect the middle part of a frame, the other end of the straight middle rib is connected to the middle part of the opposite frame, and the other ends of each of the two oblique middle ribs are respectively connected to the two corners of the opposite frame.

5. The tooling for clamping small hollow frame-shaped workpieces according to claim 3 is characterized in that: The middle rib of the frame-shaped workpiece is a straight middle rib; one end of the straight middle rib is connected to the middle of one frame, and the other end is connected to the middle of the opposite frame.

6. The tooling for clamping small hollow frame-shaped workpieces according to claim 3 is characterized by: The middle ribs of the frame-shaped workpiece are two oblique middle ribs; one end of each of the two oblique middle ribs is connected together to the middle of a frame, and the other end is connected to two corners of the opposite frame.

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