阅读说明：本技术 一种在线测量薄板高速精密级进冲裁凸模磨损的方法 (method for online measurement of abrasion of high-speed precision progressive blanking punch of thin plate ) 是由 胡道春 王蕾 王红军 于 2019-10-22 设计创作，主要内容包括：本发明公开了一种在线测量薄板高速精密级进冲裁凸模磨损的方法,包括以下步骤：S1：首先对冲头进行活化,将冲头暴露在氘束(氘核束是在粒子加速器中产生的,能量为12MeV)中,冲头是由碳化钨制成,钨根据其同位素丰度被转化成不同的物种,活化仅涉及冲头钨原子的一部分,且仅在冲头的所需活化部分(与覆盖材料接触)上实现；本发明一种在线测量薄板高速精密级进冲裁凸模磨损的方法,该方法具有较高的精度和对摩擦学条件变化的敏感性,可以在不拆卸冲裁凸模的情况下实时使用,有效地提高了工作效率；薄层活化法测量的最终磨损量已通过对磨损冲头轮廓的附加测量得到证实,这两个结果之间的良好一致性证实了薄层活化法的准确性。(The invention discloses a method for online measurement of wear of a high-speed fine progressive blanking punch of a thin plate, which comprises the following steps S1, that is, a punch is activated and exposed in a deuterium beam (the deuterium nuclear beam is generated in a particle accelerator and has the energy of 12MeV), the punch is made of tungsten carbide, tungsten is converted into different species according to the isotopic abundance of the tungsten, the activation only relates to parts of tungsten atoms of the punch and is realized only on the required activation parts (contacted with a covering material) of the punch, online measurement of wear of the high-speed fine progressive blanking punch of the thin plate, the method has higher precision and sensitivity to the change of tribological conditions, can be used in real time without disassembling the blanking, the working efficiency is effectively improved, the final wear measured by a thin-layer activation method is confirmed by additional measurement of the profile of the wear punch, and the accuracy of the thin-layer activation method is confirmed by good between the two results.)

1, method for online measuring abrasion of high-speed fine progressive blanking punch of thin plate, which is characterized by comprising the following steps:

s1, first, the punch is activated, exposing it to a deuterium beam (the deuterium nuclear beam is generated in a particle accelerator, with an energy of 12MeV), the punch being made of tungsten carbide, the tungsten being converted into different species according to its isotopic abundance, the activation only involving the part of the tungsten atoms of the punch and being effected only on the desired activated part of the punch (in contact with the covering material), as shown in fig. 1;

s2: as shown in fig. 2, the die is opened, the probe fixing block (5) is directly placed on the concave die plate (7), the probe fixing block (5) is positioned through the positioning pin, the detector probe (6) of the HpGe detector (with the resolution of 1.9keV and the relative efficiency of 47%) is installed inside the probe fixing block (5), the punching stroke of the punch press is used for adjusting the height value of the probe fixing block (5), then the punch press is positioned at the bottom dead center, the discharging spring is compressed at the moment, the convex die is exposed out of the discharging plate (2) by 0.2mm, and as shown in fig. 3, the relative activity of the worn convex die is measured;

s3 calibration of the relationship between wear volume and relative activity, activation of batches of 6 μm thick tungsten foils under the same conditions while activating the punches, measurement of the activity of the stacks of these foils, in order to convert the activity loss measured on the punches into the volume of the worn material, allows to obtain a relative activity curve according to the reduction of the tungsten foils while changing the number of foil plates, as shown in fig. 4;

s4, calibrating the influence of thermal expansion on the measurement activity, arranging position sensors between the upper die base and the stripper plate for measuring the influence of thermal expansion of the press when the position of the measurement activity is arranged, measuring the 300 mu m change of the distance between the punch and the movable measurement probe, and obtaining a calibration curve of the influence of the punch/probe distance on the measurement activity, as shown in FIG. 5;

s5: the natural loss of relative activity over time was calibrated and the activity of the tungsten foil was measured at constant time intervals and the relative decay in activity of the tungsten foil obtained in this way was used to obtain a plot of the natural activity loss of the punches as shown in figure 6.

2. The method for on-line measurement of wear of high-speed fine progressive blanking punches for thin plates according to claim 1, wherein the step S1 activates a cylindrical punch having a height of 500 μm and an activation depth of 100 μm.

3. The method of on-line measurement of punch wear in high speed fine progressive blanking of sheets according to claim 1, wherein each measurement in step S2 is performed by stopping the press and placing the probe under the die, ensuring that the detector of each measurement is repositioned above the cavity plate as accurately as possible in its previous fixed position.

4. The method of on-line measurement of abrasion of punch for high-speed fine progressive cutting of thin sheets according to claim 1, wherein the function of abrasion loss and relative activity in the step S2 is determined by foil stack activation.

Technical Field

The invention relates to methods for measuring blanking punches, in particular to methods for measuring abrasion of thin plate high-speed fine progressive blanking punches on line.

Background

The wear of the punch during blanking affects the quality of the blanked part, in particular the occurrence of burrs and their amount, in close relation to the geometrical properties of the punch and the die during blanking. However, during the blanking process, the punch and the die wear, resulting in a gradual change of the geometry of the blanking punch. Therefore, the real-time abrasion of the punching male die is evaluated, and the method has very important significance for ensuring the correct maintenance, replacement and sharpening of the cutter. Furthermore, increasing the wear resistance of the blanking punch requires that such wear can be measured accurately. Conventionally, the wear of the blanking punch can be measured indirectly by the evolution of the profile of the blanking member, and also directly by the measurement of the profile of the punch. However, these measurement methods suffer from the disadvantage that it is often necessary to punch a large number of parts (until the punch is sharpened again) or to disassemble the die, respectively. When disassembling the die, it is not possible to guarantee absolute uniformity of the blanking gap when reassembling the punch and die parts, which would seriously affect the wear kinetics (eccentricity of a few microns would significantly alter the blanking conditions, in particular for high-speed blanking of thin plates).

Disclosure of Invention

The invention aims to provide methods for online measuring the abrasion of a high-speed fine progressive blanking punch of a thin plate, which have the advantages of higher precision, sensitivity to the change of tribological conditions and the like.

In order to achieve the purpose, the invention provides the following technical scheme that methods for measuring the abrasion of the high-speed fine progressive blanking punch of the thin plate on line comprise the following steps:

s1, first, the punch is activated, exposing it to a deuterium beam (the deuterium nuclear beam is generated in a particle accelerator, with an energy of 12MeV), the punch being made of tungsten carbide, the tungsten being converted into different species according to its isotopic abundance, the activation only involving the part of the tungsten atoms of the punch and being effected only on the desired activated part of the punch (in contact with the covering material), as shown in fig. 1;

s2: as shown in fig. 2, the mold is opened, the probe fixing block is directly placed on the concave mold plate, the probe fixing block is positioned through the positioning pin, the detector probe of the HpGe detector (the resolution is 1.9keV, the relative efficiency is 47%) is installed inside the probe fixing block, the punching stroke of the punch press is used for increasing the height value of the probe fixing block, then the punch press is positioned at the bottom dead center, the discharging spring is compressed at the moment, the convex mold is exposed out of the discharging plate by 0.2mm, and as shown in fig. 3, the relative activity of the worn convex mold is measured;

s3 calibration of the relationship between wear volume and activation loss, for converting the activation loss measured on the punch into worn material volume, batches of tungsten foils with a thickness of 6 μm were activated under the same conditions while activating the punch, and the activity of the stacks of these foils was measured, allowing a relative activity curve to be obtained from the reduction of the tungsten foils while changing the number of foil sheets, as shown in fig. 4;

s4, calibrating the influence of thermal expansion on the measurement activity, arranging position sensors between the upper die base and the stripper plate for measuring the influence of thermal expansion of the press when the position of the measurement activity is arranged, measuring the corresponding relative activity value when the distance between the punch and the movable measurement probe is changed from 0-300 μm, and obtaining a calibration curve of the influence of the punch/probe distance on the measurement activity, as shown in FIG. 5;

s5: the natural loss of relative activity over time was calibrated and the activity of the tungsten foil was measured at constant time intervals and the relative decay in activity of the tungsten foil obtained in this way was used to obtain a plot of the natural loss of activity of the punch as shown in figure 6.

In the preferred embodiments of the present invention, the activation depth of the cylindrical punch having a height of 500 μm in the step S1 is set to 100 μm.

As a preferred alternative to of the present invention, the S2 procedure stops the press and places the probe under the die for each measurement, and it must be ensured that the detector for each measurement is repositioned above the cavity plate in its previous, fixed position as accurately as possible.

In the preferred embodiments of the present invention, the function of the amount of wear and the relative activity in the step S2 is determined by a foil-stack activation method.

Compared with the prior art, the method for measuring the abrasion of the punch of the thin-plate high-speed precision progressive blanking has the advantages that methods for measuring the abrasion of the punch of the thin-plate high-speed precision progressive blanking have higher precision and sensitivity to changes of tribological conditions, can be used in real time without disassembling a blanking cutter, effectively improves the working efficiency, and the final abrasion loss measured by a thin-layer activation method is proved by additional measurement of the profile of an abrasion punch, and the good consistency between the two results proves the advantage of the accuracy of the thin-layer activation method.

Drawings

FIG. 1 is a schematic illustration of the punch activation configuration of the present invention;

FIG. 2 is a schematic structural diagram of a template of the present invention;

FIG. 3 is a schematic structural view of the relative activity measurement of the die plate of the present invention after wear of the punch;

FIG. 4 is a calibration curve of activation loss for the amount of material lost by the punch of the present invention due to wear;

FIG. 5 is a calibration curve of the effect of punch/probe distance on measurement activity of the present invention;

FIG. 6 is a calibration curve of the natural decrease in natural activity of the present invention over time;

fig. 7 is a relative activity of the blanking punch according to the present invention as a function of wear.

In the figure: 1. a lower die holder; 2. a stripper plate; 3. a punch; 4. a discharge spring; 5. a probe fixing block; 6. a detector probe; 7. a cavity plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.

Referring to fig. 1-7, the present invention provides methods for online measurement of wear of a high-speed fine-progressive blanking punch for a thin plate, comprising the steps of:

s1, first, the punch is activated, exposing it to a deuterium beam (the deuterium nuclear beam is generated in a particle accelerator, with an energy of 12MeV), the punch being made of tungsten carbide, the tungsten being converted into different species according to its isotopic abundance, the activation only involving the part of the tungsten atoms of the punch and being effected only on the desired activated part of the punch (in contact with the covering material), as shown in fig. 1;

s2: as shown in fig. 2, the mold is opened, the probe fixing block 5 is directly placed on the concave mold plate 7, the probe fixing block 5 is positioned through a positioning pin, the detector probe 6 of the HpGe detector (with the resolution of 1.9keV and the relative efficiency of 47%) is installed inside the probe fixing block 5, the punching stroke of the punch increases the height value of the probe fixing block 5, then the punch is positioned at a bottom dead center, at the moment, the discharge spring is compressed, the male mold is exposed out of the discharge plate by 20.2 mm, and as shown in fig. 3, the relative activity of the worn male mold is measured;

s3 calibration of the relationship between wear volume and activation loss, for converting the activation loss measured on the punch into worn material volume, batches of tungsten foils with a thickness of 6 μm were activated under the same conditions while activating the punch, and the activity of the stacks of these foils was measured, allowing a relative activity curve to be obtained from the reduction of the tungsten foils while changing the number of foil sheets, as shown in fig. 4;

s4, calibrating the influence of thermal expansion on the measurement activity, arranging position sensors between the upper die base and the stripper plate for measuring the influence of thermal expansion of the press when the position of the measurement activity is arranged, measuring the corresponding relative activity value when the distance between the punch and the movable measurement probe is changed from 0-300 μm, and obtaining a calibration curve of the influence of the punch/probe distance on the measurement activity, as shown in FIG. 5;

s5: the natural loss of relative activity over time was calibrated and the activity of the tungsten foil was measured at constant time intervals and the relative decay in activity of the tungsten foil obtained in this way was used to obtain a plot of the natural loss of activity of the punch as shown in figure 6.

Preferably, the cylindrical punch having a height of 500 μm is activated in the step of S1, the activation depth being set to 100 μm; for each measurement in the step S2, the press is stopped and the probe is placed under the die; it must be ensured that the detector of each measurement is relocated as accurately as possible on the upper surface of the cavity plate in its previously fixed position; the function of the amount of wear and the relative activity in the step S2 was determined by the foil stack activation method.

When the method is used specifically, methods for measuring the abrasion of the high-speed fine progressive blanking male die of the thin plate on line firstly pass through a HI-13 serial accelerator, a left 10-degree pipeline and a proton pair material CD650 with the size of CD650The prepared target specimen was irradiated with protons with an electric current intensity I of 1 μ a, E9 MeV, and a proton current intensity I of 1 μ a by irradiation with 56Fe (p, n)56Co, and the beam current of the target sheet (tungsten plate) and the target specimen (punch) was activated to 4000 μ C, and a punched piece of C5191 phosphor bronze (thickness 0.1mm) was first punched with a die (punching gap 0.003mm, lubrication condition 3.2 g/m), for example, a punched piece of C5191 phosphor bronze (thickness 0.1mm) to obtain a punched piece of C5191 phosphor bronze ²1000 punches per minute), stopping the press after punching, adjusting the height of the fixed block 5 by the punching stroke of the press, placing the fixed block 5 on the upper surface of the cavity plate 7, positioning the fixed block 5 by means of the positioning pins, installing the probe 6 of the HpGe detector (resolution 1.9keV, relative efficiency 47%) inside the fixed block 6, then the press is at the bottom dead center, with the discharge spring compressed, the punch exposed out of the stripper plate by 20.2 mm, as shown in fig. 3, calibrating the relative activity with respect to the wear volume, calibrating the relationship between the wear volume and the activity loss, activating batches of tungsten foils having a thickness of 6 μm under the same conditions while activating the punch, measuring the activity of these foil stacks, allowing to obtain a relative curve according to the thickness of the tungsten foils while changing the number of the foils, as shown in fig. 4, calibrating the effect of thermal expansion on the measured activity, providing position sensors between the upper die base and the stripper plate, measuring the effect of the punch when the punch is set, obtaining a relative activity curve from the measured by the relative movement of the punch, measuring the probe, measuring the distance of the probe, and measuring the distance of the measured relative activity of the punch, as shown in the calibration curve, and the measurement of the measurement probe, and the measurement ofFor the natural loss of activity over time, the activity of the tungsten foil was measured at constant time intervals, and the relative decay of the activity of the tungsten foil obtained in this way, a curve of the natural activity loss of the punch was obtained, as shown in fig. 6; according to the measurement result, the relative activity (%) and the abrasion loss (mum) of the blanking punch at different moments are finally obtained³) The relation curve of (A) realizes the online abrasion measurement of the high-speed fine progressive blanking punch of the thin plate, as shown in figure 7, the method is not only limited to the abrasion measurement of the blanking piece made of C5191 phosphor bronze, but also can be suitable for the abrasion measurement of the blanking pieces made of other materials, and can accurately measure the abrasion loss of the blanking punch.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", " end", "top", "middle", " end", "upper", " side", "top", "inner", "front", "center", "two ends", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "", "second", "third", "fourth" may explicitly or implicitly include at least of such features.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like shall be meaning, for example, they may be fixedly connected, detachably connected, or -shaped bodies, they may be mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, they may be connected inside two elements or their interaction relationship, and unless otherwise explicitly stated or limited, those of ordinary skill in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.