Positioning clamp for impact sample notch wire moving machining

Abstract

The utility model relates to a positioning clamp for impact sample notch wire moving machining. The positioning clamp comprises a clamp body, an eccentric pressing wheel, a pressing sliding block and an elastic pressing pad. A machine tool connecting part of the clamp body is fixedly connected with a machine tool workbench, a left groove, a rectangular through hole and a right groove are formed in a sample pressing, positioning and clamping part of the clamp body, an eccentric pressing wheel is embedded in the left groove, rotating shafts are arranged in shaft holes in the two sides of the left groove, and the eccentric pressing wheel is rotationally connected to the rotating shafts; the pressing sliding block is embedded in the left portion in the rectangular through hole in a left-right sliding mode. An elastic pressing pad is fixed on the right side surface of the pressing sliding block; a sample placing space is formed between the elastic pressing pad and the right side surface of the rectangular through hole in the rectangular through hole; under the state that the high position of the outer side of the eccentric pressing wheel is in contact with the left side face of the pressing sliding block, the elastic pressing pad enables the multiple samples which are arranged in the sample containing space in an up-down multi-layer mode to be pressed on the right side face of the rectangular through hole. The clamp can realize one-time positioning and clamping of a plurality of samples, and the processing efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of material processing, and in particular relates to a positioning fixture for impact specimen notch wire-feeding processing. Background Art

[0002] In material mechanics experiments, the depth, shape, angle and arc radius of the impact specimen notch have a great influence on the impact performance. There are three existing methods for processing impact notches:

[0003] The first method is to use a horizontal milling machine to install a thin slice milling cutter with the same shape as the notch for milling. This method requires high technical level of the processing operator, high precision of the machine tool, good precision of the fixture vise, and cannot process multiple impact specimens at a time. Because it is the last step in the impact specimen processing, the impact specimen cannot be knocked, and it is difficult to ensure that the specimen clamp is flat and straight. The tool wear is accompanied by the processing process, and it cannot be detected on the machine tool. The notch of the impact specimen needs to be detected with a projector. If it exceeds the tolerance, it cannot be repaired by the milling machine again. It can only be re-sampled and re-processed, which wastes a lot of time.

[0004] The second method is to use a broaching machine to process the impact notch using a broach. One sample is processed at a time. Compared with milling machines, it is faster and has lower technical requirements for operators. However, when processing impact samples with high hardness, the dimensional accuracy is prone to deviations, and large burrs are easily produced on the notch surface. When processing impact samples with high viscosity, irregular notches are easily formed on the notch surface, causing the sample to be scrapped and resampled.

[0005] The third method is to install a thin grinding wheel on the curve grinder and trim it into a shaped grinding wheel that is the same as the notch to grind the impact notch. One sample is processed each time. This method has high processing accuracy, but it is necessary to use a milling machine or a broaching machine to process the notch with an allowance, and then use the curve grinder for processing. This method has three important disadvantages. The first is that the steps are complicated and the processing time is long, and the notch with an allowance needs to be opened in advance. The second is that the operation is complicated and the working environment is poor. It needs to be processed by projection in a pure black closed environment, and the noise is loud. The third is that the grinding wheel wears and deforms after grinding a few impact notches, and needs to be re-trimmed, which wastes a lot of time. Utility Model Content

[0006] In view of the deficiencies of the prior art, the utility model provides a positioning fixture for impact specimen notch wire-cutting processing, which can position and clamp multiple specimens at one time, ensure the positioning accuracy of the specimens, and improve the processing efficiency of the specimens.

[0007] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0008] A positioning fixture for impact specimen notch wire processing, characterized by comprising a clamp body, an eccentric clamping wheel, a clamping slide block, and an elastic clamping pad;

[0009] The bottom plane of the clamp body is an installation and positioning surface in contact with the working table of the machine tool, and the clamp body as a whole is composed of a machine tool connecting part and a sample pressing and positioning clamping part arranged on the left and right, and the width of the sample pressing and positioning clamping part is consistent with the length of the sample; the height of the machine tool connecting part is lower than the height of the sample pressing and positioning clamping part, and a screw through hole is arranged on the machine tool connecting part, which is fixedly connected to the machine tool workbench by the through screw; the sample pressing and positioning clamping part is in the shape of a square column, and a rectangular through hole is arranged in the front-to-back direction in the middle part of the sample pressing and positioning clamping part, and a left groove is arranged vertically in the middle part of the left side of the sample pressing and positioning clamping part, and the right end groove bottom extends to the left side of the rectangular through hole, and axial holes are coaxially arranged on both sides of the left groove; a right groove is arranged vertically in the middle part of the right side of the sample pressing and positioning clamping part, and the right groove is a wire-feeding clearance groove, and the left end groove bottom of the right groove extends to the right side of the rectangular groove, and the depth of the right groove extending into the rectangular groove is greater than the notch processing depth set for the sample;

[0010] The eccentric pressing wheel is embedded in the left groove in a clearance fit manner, and a rotating shaft is installed in the shaft holes on both sides of the clamp body, and the eccentric pressing wheel is rotatably connected to the rotating shaft through the shaft holes;

[0011] The clamping slider is embedded in the left position of the rectangular through hole on the clamp body in a manner that it can slide in the left and right directions;

[0012] The elastic pressure pad is fixed on the right side of the pressure slider, and a sample placement space is formed in the rectangular through hole between the elastic pressure pad and the right side of the rectangular through hole;

[0013] When the outer high point of the eccentric pressing wheel contacts the left side of the pressing slide block, the elastic pressing pad presses multiple samples arranged in multiple layers in the sample placement space onto the right side of the rectangular through hole.

[0014] Moreover, a clamping handle extending in the radial direction is fixed on the outer side of the eccentric clamping wheel.

[0015] Moreover, the elastic pressing pad is a rubber pad.

[0016] The advantages and positive effects of the utility model are:

[0017] 1. The utility model provides a rectangular through hole for installing a clamping slide and a sample on the clamp body. The eccentric clamping wheel presses the clamping slide, and the elastic clamping member on the right side of the clamping slide realizes one-time positioning and clamping of multiple samples, thereby ensuring the positioning accuracy. During the processing, the wire can be fed once, and multiple samples can be processed simultaneously, which can greatly improve the processing efficiency.

[0018] 2. The positioning fixture of the utility model is applied to wire-cutting processing equipment and is not affected by the hardness or viscosity of the sample material and can achieve good processing accuracy.

[0019] 3. The utility model drives the eccentric pressing wheel to perform pressing and lifting operations through the pressing handle, which has the advantages of convenient operation and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the positioning fixture of the utility model;

[0021] Figure 2 It is a top view of the positioning fixture of the utility model;

[0022] Figure 3 It is a three-dimensional diagram of the positioning fixture of the utility model. DETAILED DESCRIPTION

[0023] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0024] A positioning fixture for impact specimen notch wire processing, see Figure 1-Figure 3 , including a clamping body 2, an eccentric pressing wheel 4, a pressing slider 5, and an elastic pressing pad 6.

[0025] The bottom plane of the clamp body is an installation positioning surface, which is used to contact the worktable of the machine tool. The clamp body as a whole is composed of a machine tool connecting part 2.1 and a sample pressing and positioning clamping part 2.2 arranged on the left and right. The height of the machine tool connecting part is lower than the height of the sample pressing and positioning clamping part. A screw through hole is arranged on the machine tool connecting part, and it is fixedly connected to the machine tool worktable by a through screw 1. The sample pressing and positioning clamping part is in the shape of a square column. A rectangular through hole is arranged in the middle part of the sample pressing and positioning clamping part along the front-to-back direction. The height of the rectangular through hole is consistent with the height of the pressing slider. The width of the rectangular through hole (the dimension along the left-right direction) is greater than the sum of the thickness of the pressing slider, the thickness of the elastic pressing pad and the width of the sample, which is used to realize the positioning and installation of the pressing slider, the elastic pressing pad and the sample. A left groove 2.2.1 is provided in the middle of the left side of the sample clamping and positioning clamping part. The bottom of the right end of the left groove extends to the left side of the rectangular through hole. The left groove adopts a rectangular groove. The left groove is used to set an eccentric clamping wheel. Axle holes are coaxially provided on both sides of the left groove. A right groove 2.2.2 is provided in the middle of the right side of the sample clamping and positioning clamping part. The bottom of the left end of the right groove extends to the right side of the rectangular groove. The depth of the right groove extending into the rectangular groove needs to be greater than the notch processing depth set for the sample. The right groove adopts a rectangular groove, and the right groove is a wire-cutting clearance groove. The width of the right groove needs to meet the width requirements of wire-cutting processing.

[0026] The eccentric pressing wheel is inserted into the left groove in a clearance fit manner, and a rotating shaft is installed in the shaft holes on both sides of the clamp body. The eccentric pressing wheel is rotatably connected to the rotating shaft through the shaft hole, so that the eccentric wheel can rotate around the rotating shaft. In order to facilitate the rotation adjustment of the eccentric pressing wheel, a radially extending pressing handle 3 is fixed on the outer side of the eccentric pressing wheel.

[0027] The clamping slider is embedded in the left position of the rectangular through hole on the clamp body in a slidable manner along the left and right directions, and the left side surface of the clamping slider contacts the outer surface of the eccentric clamping wheel.

[0028] The elastic pressing pad is fixed on the right side of the pressing slider, and the elastic pressing pad can be a rubber pad. A sample placement space is formed in the rectangular through hole between the elastic pressing pad and the right side of the rectangular through hole, so that multiple samples can be pressed and placed in sequence along the up and down directions, thereby realizing one-time wire processing of multiple samples.

[0029] In the present invention, the machine tool connection part of the clamp body and the sample pressing and positioning clamping part can adopt the equal width design (along the front and rear direction) as shown in the attached figure, or can adopt the unequal width design. Among them, the width of the sample pressing and positioning clamping part is designed to be consistent with the length of the sample, so that when the sample is inserted into the rectangular through hole, the end face of the sample is aligned with the end face of the clamp body, and the center of the sample and the right groove can be aligned.

[0030] The operating steps of using the positioning fixture for notch wire processing of impact specimens to perform wire processing on the specimens are as follows:

[0031] Step 1: Fix the clamp body of the fixture to the machine tool through the connecting screws, and use the dial indicator to confirm that the X-axis, Y-axis and Z-axis of the fixture coincide with the machine tool.

[0032] Step 2: Place the impact specimen 7 Figure 3 At the right position of the middle rectangular through hole, the end face of the specimen is aligned with the end face of the corresponding part of the clamp body, ensuring that the position of the notch to be processed of the specimen is aligned with the center of the right groove.

[0033] Step 3: Press down Figure 3 The middle clamping handle drives the eccentric clamping wheel to rotate, so that the outer high point of the eccentric clamping wheel contacts the left side of the clamping slider, drives the clamping block slider to move right, and clamps the left end faces of multiple specimens through the elastic clamping pad to achieve the rightward tightening and positioning of the impact specimens.

[0034] Step 4: Use the machine tool to align the tool with the midpoint of the impact specimen and the right edge of the impact, and save the machine tool coordinates.

[0035] Step 5: Call the notch processing program to start wire processing.

[0036] Step 6: After processing, lift Figure 3 Press the handle tightly and take out the impact specimen.

[0037] The above are the operating steps for the first installation of this fixture. After confirming that the tool setting is accurate and the processing is qualified, this fixture does not need to be re-set without disassembly. It only needs to call up the saved machine tool coordinates and impact notch processing program, repeat the second step of placing the sample, the third step of tightening the sample, processing the sample, and the sixth step of removing the sample. It greatly reduces labor intensity and ensures the stability of the sample processing dimensional accuracy.

[0038] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A positioning fixture for impact specimen notch wire processing, characterized in that: It includes a clamp body, an eccentric pressing wheel, a pressing slide block, and an elastic pressing pad; The bottom plane of the clamp body is an installation and positioning surface in contact with the working table of the machine tool, and the clamp body as a whole is composed of a machine tool connecting part and a sample pressing and positioning clamping part arranged on the left and right, and the width of the sample pressing and positioning clamping part is consistent with the length of the sample; the height of the machine tool connecting part is lower than the height of the sample pressing and positioning clamping part, and a screw through hole is arranged on the machine tool connecting part, which is fixedly connected to the machine tool workbench by the through screw; the sample pressing and positioning clamping part is in the shape of a square column, and a rectangular through hole is arranged in the front-to-back direction in the middle part of the sample pressing and positioning clamping part, and a left groove is arranged vertically in the middle part of the left side of the sample pressing and positioning clamping part, and the right end groove bottom extends to the left side of the rectangular through hole, and axial holes are coaxially arranged on both sides of the left groove; a right groove is arranged vertically in the middle part of the right side of the sample pressing and positioning clamping part, and the right groove is a wire-feeding clearance groove, and the left end groove bottom of the right groove extends to the right side of the rectangular groove, and the depth of the right groove extending into the rectangular groove is greater than the notch processing depth set for the sample; The eccentric pressing wheel is embedded in the left groove in a clearance fit manner, and a rotating shaft is installed in the shaft holes on both sides of the clamp body, and the eccentric pressing wheel is rotatably connected to the rotating shaft through the shaft holes; The clamping slider is embedded in the left position of the rectangular through hole on the clamp body in a manner that it can slide in the left and right directions; The elastic pressure pad is fixed on the right side of the pressure slider, and a sample placement space is formed in the rectangular through hole between the elastic pressure pad and the right side of the rectangular through hole; When the outer high point of the eccentric pressing wheel contacts the left side of the pressing slide block, the elastic pressing pad presses multiple samples arranged in multiple layers in the sample placement space onto the right side of the rectangular through hole.

2. The positioning fixture for impact specimen notch wire processing according to claim 1 is characterized in that: A radially extending clamping handle is fixed on the outer side of the eccentric clamping wheel.

3. The positioning fixture for notch wire cutting of impact specimen according to claim 1, characterized in that: The elastic pressing pad is a rubber pad.

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