CN2161406Y

CN2161406Y - Special purpose vacuum soldering machine for polymerized crystal diamond compound sheet

Info

Publication number: CN2161406Y
Application number: CN 93230806
Authority: CN
Inventors: 陈建民; 吴开源; 庞景芹; 许敬年
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 1993-04-28
Filing date: 1993-04-28
Publication date: 1994-04-13
Anticipated expiration: 2003-04-28

Abstract

The utility model relates to a vacuum soldering machine which can be used for soldering polycrystalline diamond complex sheets. Two electrodes and two pressing rods are arranged in a vacuum chamber. The end parts of the electrodes and the pressing rods are exposed at the outside. A sealing device is arranged among the electrodes, the pressing rods and the vacuum chamber. The welded workpiece is fixed and clamped by the electrodes and the pressing rods. The lectrode are energized and implements self heating by using the resistance heat of the workpiece. Simultaneously the electrodes and the pressing rods can be cooled by using water, causing the diamond layer of the compound sheet to be locally cooled. The upper cover of the vacuum chamber is provided with a transparent window which is used for observing the whole soldering process. The soldering machine has the advantages of simple structure, convenient operation, high temperature soldering for the local part of a soldered joint, high intensity of soldering seams and decreased welding cost, and is suitable for small lot welding production and laboratory researches.

Description

Special purpose vacuum soldering machine for polymerized crystal diamond compound sheet

The utility model relates to a kind of vacuum brazing machine, is used for the soldering composite polycrystal-diamond.

Polycrystalline diamond cutting teeth PDC drill bit is a kind of novel chipping type bit that is embedded in drill steel body (or being welded in bit matrix) with the man-made polycrystalline diamond cutting teeth, and polycrystalline diamond cutting dentition is soldered on the carbide alloy pillar by composite polycrystal-diamond and constitutes.When temperature surpassed 700 ℃, the diamond layer of composite sheet will lose efficacy.Drill bit is more abominable in the operating mode of underground work, and requiring composite sheet and carbide alloy to prop up intercolumniation has higher soldering strength.In general, the temperature of solder is high more, and the brazed seam intensity of being welded is also high more, and this has just proposed to implement the requirement that high temperature brazing obtains the high strength brazed seam under assurance composite sheet diamond layer is heated the situation that is lower than 700 ℃.At present, generally adopt silver-base solder low temperature brazing and diffusion welding (DW) welding polycrystalline diamond cutting teeth.But the brazed seam room temperature strength of silver-base solder low temperature brazing is low, and elevated temperature strength is lower; The equipment price costliness that diffusion welding (DW) is required, and be unsuitable for the welding of small batch workpiece.

The purpose of this utility model is to provide a kind of cost low, is suitable for the special-purpose vacuum brazing machine of the soldering composite polycrystal-diamond that small lot batch manufacture and laboratory research use.The composite sheet diamond layer is lower than at heating temperature under 700 ℃ the situation still can implements high temperature brazing, obtain the high strength brazed seam.

The purpose of this utility model is achieved in that its critical piece has power supply, vacuum chamber, diffusion pump, mechanical pump, compound vacuum gauge etc.Vacuum chamber is cylindric, two electrodes and two depression bars radially are installed on the wall of vacuum chamber, electrode and depression bar are arranged at interval, in electrode and the depression bar cooling system is arranged, cool off with recirculated water, between electrode, depression bar and the vacuum-chamber wall dynamic sealing device is arranged, be stamped transparent window on the vacuum chamber, vacuum chamber connects diffusion pump.

Accompanying drawing 1 is exactly the structural representation according to the vacuum brazing machine that the utility model proposed

Accompanying drawing 2 is exactly the profile of Fig. 1 along the A-A position.

Among the figure, 1-transparent window, 2-vacuum chamber, 3-electrode, 4-diffusion pump, 5-mechanical pump, 6-compound vacuum gauge, 7-power supply, 8-depression bar.

Describe the concrete structure of the vacuum brazing machine that is exclusively used in the soldering composite polycrystal-diamond that proposes according to the utility model in detail below in conjunction with accompanying drawing and most preferred embodiment.

This vacuum brazing machine is to connect diffusion pump by vacuum chamber, and diffusion pump connects mechanical pump and forms.Vacuum chamber (2) is cylindric, and Qi Bishang radially installs two electrodes (3) and two depression bars (8), and electrode and depression bar arrange that at interval two electrodes connect power supply respectively, in electrode and the depression bar cooling system are arranged, and cool off with recirculated water.The relative position of electrode (3) and depression bar (8) is by being determined by the profile of soldering work piece, present embodiment is according to the profile characteristics of polycrystalline diamond cutting teeth, the relative position of electrode and depression bar is designed to 90 ° of angles, 70 °, 90 °, 110 °, be distributed on the same circumferential plane, be specifically designed to soldering polycrystalline diamond cutting teeth.Be stamped transparent window (1) on the vacuum chamber (2), be used to observe whole brazing process,, just stop the soldering heating immediately in case the solder fusing forms good brazed seam.Diffusion pump (4) and mechanical pump (5) are used for vacuumizing, and compound vacuum gauge (6) is connected on the diffusion pump (4), are used for measuring the vacuum of vacuum chamber; The radial motion of depression bar (8) energy is exerted pressure to workpiece, so that extrude redundant brazing in the brazed seam, improves the intensity of brazed seam.

Characteristics of the present utility model: 1. adopt vacuum brazing, guarantee easily the fine and close zero defect of brazed seam; 2. adopt and force the cooling depression bar, both extruded solder unnecessary in the brazed seam, improve the intensity of brazed seam, diamond layer to composite sheet cools off again, makes the diamond layer regional area form low-temperature space, so just allows to use high-temp solder, implement high temperature brazing, obtain high-intensity brazed seam; 3. utilize the resistance heat heating of workpiece itself, firing rate is fast, and the holding time is short, directly observes soldering situation in the vacuum chamber by transparent window, in case form good brazed seam, with regard to stopped heating, guarantees easily brazing quality. Advantage of the present utility model is compared with the soldering of low temperature money base, has improved Joint intensity: compare with diffusion welding (DW), greatly reduce the welding expense.

Claims

1, a kind of vacuum brazing machine, be used for the soldering composite polycrystal-diamond, form by vacuum chamber, power supply, diffusion pump, mechanical pump, compound vacuum gauge etc., it is characterized in that on the wall of vacuum chamber (2), radially installing two electrodes (3), two depression bars (8), electrode and depression bar are arranged at interval, vacuum chamber is cylindrical, is stamped transparent window on it, is used for observing whole brazing process.

2, vacuum brazing machine as claimed in claim 1 is characterized in that in electrode and the depression bar cooling system being arranged, and water cools off.