CN103612339A - CsI crystal cutting machine - Google Patents

Abstract

The present invention relates to special processing equipment for cutting CsI crystals. The research on the structure and properties of CsI and the research on growth technology are relatively perfect, but the processing of CsI is often a major problem in the world at present. Requirements and other characteristics limit the processing method. The crystal cutting machine of the present invention is a thin slice grinding wheel cutter made of fine-grained diamond powder with a minimum thickness of 0.1mm, and the grinding wheel blade is cut along the dividing line of the cut piece at a cutting line speed of 0.1-400m/s. There is also a method of cutting through the entire crystal thickness. Under the precise drive of micro-motors in X, Y, Z, and θ directions under the control of the industrial computer, the large crystal is divided according to the preset size through the reciprocating motion in the X, Y, and Z directions and the 360° rotation in the θ direction. , resulting in a single array (window).

Description

A CsI crystal cutting machine

technical field

The invention relates to special processing equipment for cutting CsI crystals, in particular a mechanical structure with reasonable structural design and reliable working performance, and a control software design with stable operation and high degree of automation. It is suitable for precision cutting of scintillation crystals such as CsI, and can also be used for processing other similar hard and brittle materials.

Background technique

Cesium iodide (chemical formula: CsI) is an inorganic ionic compound, usually used as an input phosphor for fluorescent display devices such as X-ray image multiplier tubes. The cesium iodide cathode tube has a high detection efficiency for the strong ultraviolet band. Cesium iodide crystals are commonly used as scintillator materials for electromagnetic calorimeters in particle physics experiments. Pure cesium iodide is a fast, high-density scintillator material with relatively high luminescence.

Optical cesium iodide crystals are very soft and free of cleavage, making it difficult to produce a flat polished surface. In addition, cesium iodide optical crystals must be stored in dry containers to prevent water from reacting with cesium iodide. Coating a layer of germanium on the surface of cesium iodide can minimize the influence of exposure to moisture in the air when exchanging beam splitters.

At present, the structural performance research and growth technology research of CsI are relatively perfect, but the processing of CsI is often a major problem in the world at present. It is easy to chip, the material hardness is high, and the surface finish requirements and other characteristics limit the processing method. Usually the cutting of CsI on the market uses the mode of copper wire plus sandstone abrasive material, and this machine cutting efficiency is low, and the crystal cutting machine of the present invention is the thin slice emery wheel cutter that utilizes the thickness minimum of 0.1mm that utilizes the fine-grained diamond powder to make, at 0.1 At the cutting line speed of ~400m/s, the grinding wheel blade is cut along the dividing line of the cut piece. There is also a method of cutting through the entire crystal thickness. Under the precise drive of micro-motors in X, Y, Z, and θ directions under the control of the industrial computer, the large crystal is divided according to the preset size through the reciprocating motion in the X, Y, and Z directions and the 360° rotation in the θ direction. , resulting in a single array (window). The accuracy of the rotation in the θ direction determines the accuracy of the shape of the cut workpiece.

Contents of the invention

This equipment adopts the technical route developed independently. Through the integration of technology innovation and process innovation, we have overcome key core technologies such as precision mechanical structure design, precision design, high-precision positioning control, development of special system software and cutting technology, and developed high-tech products with independent intellectual property rights, leading domestic technology, and advanced international technology. Precision CsI Crystal Cutting Machine.

Adjust the processing range of the machine to improve the accuracy

In order to adapt to the cutting of various specifications and sizes, the length ratio of the guide rail, lead screw and base must be increased. Due to the different sizes, the accuracy level must be improved, which is mainly guaranteed by machining. The screw ball circulation mode is changed from the external circulation to the internal circulation mode with good fluency, high efficiency and easy assembly. The second is for users who require particularly high precision, choose Japanese-made precision ball screws with a stepping equivalent of 2Lm. The guide rail adopts the SP level precision produced by THK in Japan. The precision of the guide rail and screw rod produced by Nissan is twice as high as that of the domestic one, which can meet some special needs.

Increase the spindle power to ensure cutting torque

The power of the main shaft of the cutting machine has been increased from 1.25kW. The lengthening of the static pressure electric main shaft requires machining to ensure its dimensional accuracy, as well as the power of the main shaft motor, so as to flexibly drive the main shaft to rotate at a high speed. No loss of rotation when cutting thick and hard materials, ensuring cutting quality.

Improve the anti-corrosion and insulation capabilities of the machine

The cutting machine uses aluminum to make some corrosion-resistant parts. After long-term use, it is found that aluminum can resist general corrosion, but when cutting some special materials, aluminum will be eroded quickly. In such cases, other materials must be used. According to the difference of coolant during CsI cutting, stainless steel or non-metallic materials are used instead. In order to facilitate the operation of the knife setting, the metal materials that originally affected the reliability of the insulation have been treated as non-metallic.

Control Circuit Design

Increase software functions, improve integration, improve reliability, and reduce failure rate.

The advantages and positive technical effects of the present invention are: the present invention utilizes a fine copper-based diamond blade and cooperates with a high-precision aerostatic electric spindle to rotate at high speed to achieve the purpose of precision cutting, which is beneficial to reduce chipping and improve Cross-section smoothness, the use of precision mechanical structure, combined with imported grating for feed compensation, so that the accuracy of dimensional feed can be fed back in real time during cutting, and accurate control and positioning of the cutting position can be achieved. The structure design is reasonable, and the performance is safe and reliable. There are problems such as single cutting method and precision error, which provides reliable operation guarantee for the cutting quality of the cutting machine, significantly improves work efficiency and reduces the labor intensity of maintenance personnel.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Figure 1 is a diagram of the transmission system.

Description of serial numbers in the figure: 1X-direction motor, 2-carriage stage, 3-spindle, 4Y-direction motor, 5Z-direction motor, 6θ-direction motor;

Figure 2 is a schematic diagram of a fully distributed structure.

Detailed ways

The present invention is made up of two major parts of machinery and electrical equipment,

The mechanical part includes: X-axis, Y-axis, Z-axis, transmission system in 4 directions, main shaft, positioning alignment system and compressed air filtration system.

(1) The X-axis is driven by a 90BF006 reactive stepping motor, which drives the bearing piece table to reciprocate left and right on the circular guide rail through the toothed pulley and the toothed belt, with a stroke of 240mm.

(2) The Y-axis is driven by a 90BF006 reactive stepping motor through a ball screw to drive the main shaft fixed on the Y-direction sliding plate to move linearly on the guide rail with a stepping equivalent of 5Lm. There are three kinds of motion directions: repeat, index and single step, and the stroke is 170mm. If a smaller step is required, only a ball screw with a pitch of 2mm can be replaced to achieve the indexing transmission requirement of a step equivalent of 2Lm.

(3) The Z-axis is driven by a 60BF009 reactive stepper motor, which drives the guide plate to move up and down in the cylindrical guide sleeve through the screw, and then drives the spindle to move up and down in the Z direction with a step equivalent of 5Lm. There are two kinds of movement modes: continuous and single-step, and the stroke is 30mm.

型反应式步进电机，通过一对蜗轮副带动承片台作H向旋转。转角范围为0～360°，转动方式有90°、60°、单步3种。(4) The θ axis is controlled by a

Type reaction type stepper motor, through a pair of worm gear pairs, it drives the bearing table to rotate in H direction. The rotation angle ranges from 0 to 360°, and there are 3 rotation modes: 90°, 60°, and single step.

(5) Spindle This machine adopts a static pressure medium frequency electric spindle with a power of 1.25kW and a speed of 40000r/min.

(6) The positioning and alignment system adopts a high-magnification fixed-magnification microscope, and a coaxial and ring-shaped light source for alignment. The microscope can be adjusted up and down, forward and backward, fixed on the Y axis, and moves together with the spindle.

(7) The compressed air filtration system consists of a secondary oil-water filter and a primary water-separation air filter. Provides clean compressed air for the hydrostatic spindle.

Circuit control part design

(1) Design of hardware control system This machine adopts self-designed hardware control system. The output circuit is composed of 4 sets of stepper motor control circuits for X-axis, Y-axis, Z-axis and H-axis, 3 relay circuits, 3 solenoid valve circuits, 18 indicator light circuits and an alarm circuit. The entire control circuit is 8 boards, and 6 groups of power supplies are installed in an electrical cabinet placed under the host. Other transformers and stepping motor load resistors are separately placed in a transformer resistor box in order to reduce the influence of heat dissipation on the control circuit.

(2) Software design The control software of various functions of the whole machine is solidified in 2 pieces of 2716. The principle of software design is to replace hardware with soft as much as possible in order to reduce the source of failure, and make use of software features to make it convenient for users to use and maintain. Not only the decimal compensation system with step distance L is designed, but also the system fault self-diagnosis and system Parameter self-inspection function program, and also designed positioning deviation memory and automatic positioning function.

Claims (2)

1. A CzI crystal cutting machine, characterized in that: the diamond grinding wheel blade cuts along the dividing line of the cut piece under the cutting speed of 0.1～400m/s. The crystal cutting machine is precisely driven by micro-motors in X, Y, Z, and θ directions under the control of an industrial computer, through reciprocating motion in X, Y, and Z directions and 360° rotation in θ direction, according to the preset Size divides large crystals; 2. The crystal cutting machine according to claim 1, further characterized by the design of the hardware control system of the crystal cutting machine, and the design and positioning of the software control of the crystal cutting machine.

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