CN114406743A

CN114406743A - Sheet metal die cavity processing frock

Info

Publication number: CN114406743A
Application number: CN202111523863.3A
Authority: CN
Inventors: 韩小晨; 钱晨晨; 郭小雷; 段其红; 马利民; 孛鹏
Original assignee: Shanxi Pingyang Industry Machinery Co Ltd
Current assignee: Shanxi Pingyang Industry Machinery Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-04-29

Abstract

The invention relates to the technical field of thin cavity plate machining, in particular to a thin plate cavity machining tool. The technical problems of obvious flutter, large deformation, long time consumption of a processing flow and low processing efficiency in the existing thin plate cavity processing process are solved. A sheet cavity machining tool comprises a sawtooth-shaped top plate and at least one group of inclined wedge type clamps; the zigzag top plate consists of a cuboid and a protruding part vertically positioned on one narrow and long side surface of the cuboid; the length of the protruding part is the same as that of the cuboid, and the top of the protruding part is of a sawtooth structure; the inclined wedge type clamp consists of a first clamping block, a second clamping block and a third clamping block; one narrow long side surface of the first clamping block and one narrow long side surface of the third clamping block are in a slope structure, and two narrow long side surfaces of the second clamping block are in slope structures. The sawtooth-shaped top plate and the inclined wedge type clamp can obviously improve the flutter problem in the thin-wall cavity processing process and simultaneously improve the thin-wall cavity processing efficiency.

Description

Sheet metal die cavity processing frock

Technical Field

The invention relates to the technical field of thin cavity plate machining, in particular to a thin plate cavity machining tool.

Background

At present, when a sheet cavity is machined, the conventional machining methods comprise rough milling of the cavity, aging, semi-finish milling of the cavity and finish milling of the cavity. The processing flow consumes longer time, the progress requirement cannot be ensured, and the rotating speed of the machine tool can only be reduced during finish milling so as to solve the problem of reducing the vibration and deformation.

Specifically, the length of the upper cover plate of a workpiece is 470-0.3-0.4, the width of the upper cover plate is 193-0.3-0.4, the thinnest part of the upper cover plate is 2.5 +/-0.05, and the material of the upper cover plate is 5A 06. The blank is provided for the customer, and the size is: 480 × 205 × 20.

In the process of processing the workpiece, the workpiece is processed to the final size of 2.5 from the blank thickness of 20, the cutting amount is extremely large, the requirement on the dimensional tolerance of the workpiece is strict, and the processing process are easy to deform and bulge. The traditional process for processing the cavity consumes longer time and is difficult to meet the requirements of customers; and when the cavity is milled, the workpiece is clamped by a pressing plate. When the machining is carried out by the mode of the inverse pressing plate, tool receiving marks can be generated, a workpiece is easy to deform due to the action of clamping force during machining, a product is upwarped, and the tolerance is difficult to guarantee.

Disclosure of Invention

The following problems exist in the current process of processing a thin-wall cavity: 1) the problem of flutter is obvious in the processing process, and the deformation is large; 2) the processing flow has long time consumption, complex process route and low processing efficiency. In order to solve the technical problem, the invention provides a sheet cavity machining tool.

The invention is realized by adopting the following technical scheme: a sheet cavity machining tool comprises a sawtooth-shaped top plate and at least one group of inclined wedge type clamps; the zigzag top plate is composed of a cuboid and a protruding part vertically positioned on one narrow and long side surface of the cuboid; the length of the protruding part is the same as that of the cuboid, the top of the protruding part is in a sawtooth structure, and the thickness of the protruding part is smaller than that of the narrow and long side face where the protruding part is located; the cuboid is provided with a plurality of screw holes which penetrate through the two largest long side surfaces;

the inclined wedge type clamp group consists of a first clamping block, a second clamping block and a third clamping block; the three clamping blocks are cuboids with the same length, width and thickness, wherein one narrow long side surface of each of the first clamping block and the third clamping block is of a slope structure, and two narrow long side surfaces of the second clamping block are of slope structures; the included angles between the slope structures on the three clamping blocks and the vertical surface are the same; the three clamping blocks are all provided with a plurality of screw holes which penetrate through the two largest long side surfaces.

When the clamping device is used, a workpiece is clamped, the sawtooth-shaped top plate is fixed on a machine tool, then the workpiece is abutted against a sawtooth structure of the sawtooth-shaped top plate, then the first clamping block is fixed, the side, without the slope, of the first clamping block is attached to the workpiece, then the third clamping block is fixed, and finally the second clamping block is installed in the corresponding position between the first clamping block and the second clamping block; the sawtooth-shaped top plate and the inclined wedge type clamp respectively prop the workpiece from two sides. The sawtooth-shaped top plate is in contact with the workpiece through the sawtooth structure on the sawtooth-shaped top plate, and the sawtooth-shaped top plate and the workpiece are in line contact, so that the clamping force can be effectively dispersed. The two slopes of the second clamping block are respectively attached to the slopes of the first clamping block and the third clamping block. Due to the adoption of the mutually matched slope structures, the inclined wedge type clamp is stable in clamping and high in clamping force, the tolerance requirement of a product can be guaranteed, and the upwarp deformation of a workpiece is effectively prevented. Meanwhile, due to the fact that the combined clamp is used for machining parts, all machining can be completed only through a cavity milling process, machining efficiency is greatly improved, and product quality can be effectively guaranteed.

In actual work, the number of the inclined wedge type clamps is selected according to the size of the workpiece so as to ensure that the workpiece can be clamped.

Compared with the prior art, the invention has the following beneficial effects:

1) the sawtooth-shaped top plate and the inclined wedge type clamp can obviously improve the flutter problem in the thin-wall cavity processing process;

2) the efficiency of thin wall die cavity processing has been improved.

Drawings

Fig. 1 is a front view structure schematic diagram of a thin-wall shell.

Fig. 2 is a schematic top view of the structure of fig. 1.

Fig. 3 is a side view of the structure of fig. 2.

Fig. 4 is a front view structural diagram of a zigzag top plate.

Fig. 5 is a side view of the structure of fig. 4.

FIG. 6 is a front view of the clamping block.

Fig. 7 is a side view of the first clamping block.

Fig. 8 is a side view of the second clamping block.

Fig. 9 is a side view of the third clamping block.

Fig. 10 is a schematic view of the installation of the tool of the present invention and a sheet housing.

1-a sawtooth-shaped top plate, 2-a first clamping block, 3-a second clamping block, 4-a third clamping block and 5-a workpiece;

11-raised portion, 12-saw tooth structure.

Detailed Description

The tool is designed in order to solve the technical problem of thin-wall cavity machining and eliminate the condition of low efficiency in the machining process, the problem in the machining process is analyzed, the following embodiments are adopted, the workpiece circulation is reduced, the process route is simple, the machining efficiency is improved, and the problem of vibration is solved.

Example 1

As shown in fig. 4-9, a tooling for machining a thin plate cavity comprises a sawtooth-shaped top plate 1 and at least one group of inclined wedge-shaped clamps; the sawtooth-shaped top plate 1 is composed of a cuboid and a protruding part 11 vertically positioned on one narrow long side surface of the cuboid (the protruding part is tightly attached to one side edge of the long side surface); the length of the protruding part 11 is the same as that of the cuboid, the top of the protruding part is in a sawtooth structure 12, and the thickness of the protruding part 11 is smaller than that of the narrow and long side face where the protruding part is located; the cuboid is provided with a plurality of screw holes which penetrate through the two largest long side surfaces;

the inclined wedge type clamp consists of a first clamping block 2, a second clamping block 3 and a third clamping block 4; the three clamping blocks are cuboids with the same length, width and thickness, wherein one narrow long side surface of each of the first clamping block and the third clamping block is in a slope structure, and two narrow long side surfaces of the second clamping block 3 are in slope structures (matched with the slopes of the first clamping block and the third clamping block); the included angles between the slope structures on the three clamping blocks and the vertical surface are the same; the three clamping blocks are provided with a plurality of screw holes which penetrate through the two largest long side surfaces; the inclined wedge type clamps are divided into two groups.

Example 2

As shown in fig. 4 and 5, the length of the cuboid of the zigzag top plate 1 is 470mm, the thickness is 20mm, the width of the protruding part 11 is 60mm, the width of the protruding part 11 is 10mm, the thickness is 6.5mm, the height of the saw teeth is 2mm, and the distance between adjacent saw teeth is 4 mm. The parameters can effectively reduce the tremble problem in the processing process of the workpiece.

Example 3

As shown in fig. 6, the main structures of the first, second and third clamping blocks are all rectangular parallelepiped structures with the same size; as shown in fig. 7-9, the slope angles of the first, second and third clamping blocks are all 20 degrees, except that the positions of the slopes are different, the slopes of the first and third clamping blocks are only opened on one side surface, the second clamping block is opened on two side surfaces and has symmetrical structure (the two slopes are in a shape of 'eight'), and the two slopes are matched with the slopes of the first and third clamping blocks and clamped with each other; a ramp angle of 20 degrees ensures the degree of clamping. The first clamping block, the second clamping block and the third clamping block are all 220mm in length, 50mm in width and 17mm in thickness. The dimensions in the above embodiments are matched to the dimensions of the workpiece.

Example 4

Two screw holes are formed in the sawtooth-shaped top plate 1 and are positioned at two ends of the long central line; the two screw holes of the first clamping block, the second clamping block and the third clamping block are respectively positioned at two ends of the long central line; the aperture is 17 mm.

The invention is further described below with reference to the accompanying drawings. Aiming at the technical problems existing in the existing thin-wall cavity processing, the invention provides two solving measures:

1. the process route only arranges a process of milling the cavity, and the finish milling of the cavity can be completed only by keeping the last single side of the cavity by 0.2 in the process of milling the cavity.

2. A novel combined clamp is designed for clamping a workpiece, and the novel combined clamp consists of a zigzag top plate and an inclined wedge type clamp.

The serrated top plate and the inclined wedge type clamp are designed to clamp a workpiece, and the top plate is in line contact with the workpiece, so that clamping force can be effectively dispersed. The inclined wedge type clamp is stable in clamping and high in clamping force, can meet the requirement of product tolerance, and effectively prevents the workpiece from warping and deforming.

The design schematic diagram of the zigzag top plate is shown in fig. 4 and 5: the serrated top plate adopts a serrated design structure, and compared with a pressing plate, the surface contact is changed into point contact when a workpiece is clamped, so that the clamping stress and the cutting stress can be well dispersed.

The wedge clamp is shown in fig. 6-9.

The inclined wedge type clamp consists of three different clamping blocks, the first clamping block 2 and the third clamping block 4 are both provided with a slope with 20 degrees on one side, and the second clamping block 3 is provided with a slope with 20 degrees on both sides. The slope is too small, so that the slope is easy to stick in the using process, and the slope is too large and cannot completely play a supporting role. The gradient of 20 degrees adopted by the invention can just meet the requirements of the processing technology.

Referring to fig. 10, the installation sequence of the zigzag top plate and the clamping block is as follows:

1. fixing the top plate on the workbench by using a screw M16;

2. then, the workpiece is abutted against the sawtooth structure of the top plate;

3. fixing a group of inclined wedge type clamps, fixing a first clamping block, attaching to a workpiece, fixing a third clamping block, and finally installing a second clamping block at a corresponding position to attach to the first clamping block and the third clamping block;

4. and fixing the second group of inclined wedge type clamps. The two groups of inclined wedge type clamps just correspond to the length of the workpiece. In fig. 10 the workpiece 5 is a structure after it has been machined.

The combined clamp is adopted to process the workpiece, all processing can be completed only by a cavity milling process, the processing efficiency is greatly improved, and the product quality can be effectively ensured.

Claims

1. The thin plate cavity machining tool is characterized by comprising a sawtooth-shaped top plate (1) and at least one group of inclined wedge-shaped clamps; the sawtooth-shaped top plate (1) is composed of a cuboid and a protruding part (11) vertically positioned on one narrow and long side surface of the cuboid; the length of the protruding part (11) is the same as that of the cuboid, the top of the protruding part is of a sawtooth structure (12), and the thickness of the protruding part (11) is smaller than that of the narrow and long side face where the protruding part is located; the cuboid is provided with a plurality of screw holes which penetrate through the two largest long side surfaces;

the inclined wedge type clamp consists of a first clamping block (2), a second clamping block (3) and a third clamping block (4); the three clamping blocks are cuboids with the same length, width and thickness, wherein one narrow long side surface of each of the first clamping block and the third clamping block is of a slope structure, and two narrow long side surfaces of the second clamping block (3) are of slope structures; the included angles between the slope structures on the three clamping blocks and the vertical surface are the same; the three clamping blocks are all provided with a plurality of screw holes which penetrate through the two largest long side surfaces.

2. The tooling of claim 1, wherein the tapered wedge fixtures are in two sets.

3. The sheet cavity machining tool according to claim 1, wherein the cuboid of the sawtooth-shaped top plate (1) is 470mm long and 20mm thick, the width of the protruding portion (11) is 60mm, the width of the protruding portion (11) is 10mm, the thickness is 6.5mm, the height of the sawtooth is 2mm, and the distance between adjacent sawteeth is 4 mm.

4. The tooling of any one of claims 1 to 3, wherein the first, second and third clamping blocks have a slope angle of 20 degrees.

5. The sheet cavity machining tool of claim 4, wherein the first clamping block, the second clamping block and the third clamping block are all 220mm in length, 50mm in width and 17mm in thickness.

6. The tooling for machining the cavity of the thin plate as claimed in any one of claims 1 to 3, wherein two screw holes are formed in the serrated top plate (1) and are positioned at two ends of the long center line.

7. The tooling for machining the cavity of the thin plate according to any one of claims 1 to 3, wherein two screw holes are formed in the first clamping block, the second clamping block and the third clamping block and are respectively positioned at two ends of the long central line; the aperture is 17 mm.

8. The sheet cavity machining tool according to claim 5, wherein the first clamping block, the second clamping block and the third clamping block are provided with two screw holes respectively located at two ends of the long central line; the aperture is 17 mm.

9. The sheet cavity machining tool according to any one of claims 1 to 3, wherein the machining tool adopts the following steps when clamping a workpiece: 1) fixing the sawtooth-shaped top plate (1) on the workbench by using a screw M16;

2) then, the workpiece is abutted against the sawtooth structure (12) of the sawtooth-shaped top plate (1);

3) fixing a group of inclined wedge type clamps, fixing a first clamping block (2), attaching to a workpiece (5), fixing a third clamping block (4), and finally installing a second clamping block (3) at a corresponding position to attach to the first clamping block (2) and the third clamping block (4);

4) and fixing a second group of inclined wedge type fixtures, wherein the two groups of inclined wedge type fixtures are just corresponding to the length of the workpiece (5).