A die-casting punch assembly with ultrasonic

Abstract

The present invention discloses a die-casting punch assembly with ultrasonic waves, comprising a modified punch, a pressure rod transition section and a pressure rod ultrasonic section; an ultrasonic device is arranged inside the pressure rod ultrasonic section, and the ultrasonic device comprises an ultrasonic amplitude transformer and an ultrasonic generating device; the modified punch is designed with a plurality of evenly distributed step-shaped protrusions on the end face in contact with the molten metal, so as to increase the contact area between the molten metal and the punch and improve the transmission efficiency of the ultrasonic waves. By modifying the die-casting punch and the pressure rod, an effective ultrasonic load is applied to the molten metal in the pressure chamber while ensuring their original functions and performances, thereby breaking up the coarse pre-crystallized structure of the pressure chamber, thereby achieving the refinement of the die-casting structure, and effectively improving the mechanical properties of the die-casting.

Description

Summary of the Invention

[0001] The invention relates to a die-casting punch assembly with ultrasonic waves, belonging to the technical field of die-casting machines. Background Art

[0002] Cold chamber die-casting machines offer a wide range of applications due to their limited alloy restrictions, comprehensive specifications, high production efficiency, and ease of automated production. Compared to hot chamber die-casting machines, the structural difference lies in the fact that the pressure chamber and punch of a cold chamber die-casting machine are exposed to air, while those of a hot chamber die-casting machine are immersed in the high-temperature molten metal. This creates a problem: when molten metal is poured into the pressure chamber of a cold chamber die-casting machine, the hot molten metal comes into contact with the cold chamber surface, causing the leading edge of the molten metal to rapidly drop in temperature, leading to nucleation and growth, forming a pre-crystallized structure in the pressure chamber. This pre-crystallized structure, formed within the pressure chamber, acts as a nucleation point after being filled into the die-casting mold along with the hot molten metal, causing it to grow to a certain extent, resulting in a coarse structure that is detrimental to the mechanical properties of the die-casting. Research has shown that irregular contraction occurs between the pre-crystallized structure (which crystallizes first) and the aluminum matrix (which crystallizes later). This allows tiny pores to form at the grain boundaries between the pre-crystallized structure and the aluminum matrix, and between the pre-crystallized structure and the aluminum matrix. These pores become sites for crack initiation and propagation, reducing the tensile strength of the specimen. Therefore, the larger the size and the greater the number of pre-crystallized structures in the alloy, the greater the negative impact on the mechanical properties.

[0003] However, the structure of the cold chamber die-casting machine determines that the temperature of the pressure chamber and the punch will be at a lower level, and the generation of pressure chamber pre-crystallization structure is inevitable. In order to reduce the adverse effects of pressure chamber pre-crystallization structure on die-castings, some scholars have proposed to control the movement speed of the liquid during the filling process by designing flow channels, so as to achieve the purpose of crushing and dispersing the pressure chamber pre-crystallization structure. CN201910385699.0 discloses a flow channel for crushing and collecting pressure chamber pre-crystallization structure. Through the optimized design of the main flow channel, the coarse pressure chamber pre-crystallization structure in the casting is reduced and the fluidity of the metal liquid entering the casting cavity is improved, thereby improving the mechanical properties of the die-casting. CN201020032901.6 discloses a die-casting punch system, including a punch and an assembler. The assembler head of the assembler is sealed in the inner cavity of the punch. The structure mainly considers increasing the water outlet flow of cooling water, increasing the cooling area and cooling effect of the punch, thereby increasing the service life of the die-casting punch and mold, and improving the quality problems of the casting product such as shrinkage, burning and air entrapment, but does not consider the problem of crushing the pressure chamber pre-crystallization structure at all.

[0004] In summary, the existing technology does not fundamentally solve the problem of breaking up the pre-crystallized structure in the die chamber to reduce the adverse effects of the structure on the die casting. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a die-casting punch assembly with ultrasonic waves to solve the problem that the front molten metal rapidly nucleates and grows due to the chilling effect when the high-temperature molten metal contacts the surface of the pressure chamber, forming a pre-crystallization structure in the pressure chamber, which has an adverse effect on the mechanical properties of the casting, thereby achieving the purpose of improving the mechanical properties of the die-casting.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A die-casting punch assembly with ultrasonic waves comprises a modified punch, a pressure rod transition section and a pressure rod ultrasonic section; an ultrasonic device is arranged inside the pressure rod ultrasonic section, and the ultrasonic device comprises an ultrasonic amplitude transformer and an ultrasonic generating device; the modified punch is designed with a plurality of evenly distributed step-shaped protrusions on the end face in contact with the molten metal, thereby increasing the contact area between the molten metal and the modified punch, improving the transmission efficiency of the ultrasonic waves, and ensuring that the ultrasonic waves have a good crushing effect on the coarse dendrites formed in the pressure chamber.

[0008] Furthermore, the ultrasonic generating device includes a connecting rod, an electrode sheet, a piezoelectric ceramic, and a fixing block and a connecting nut for fixation; the connecting rod is provided with a thread for connecting to the amplitude rod, and a flange for limiting is provided thereafter, and a groove for limiting and fixing the electrode sheet is provided on the connecting rod body, and the groove is connected to the hollow circular groove in the center for routing; the electrode sheet is a circular conductive sheet that cooperates with the connecting rod, and a rectangular block for limiting and connecting to the power supply is provided on the inner side of the circular ring, that is, the inward protruding part of the electrode circular ring; wherein, the design of the rectangular block is based on the need to connect the ultrasonic device to the power supply. In order to realize the connection of the power supply and the fixation of the various components on the ultrasonic connecting rod, an inward protruding rectangular block is provided on the electrode connecting sheet, which cooperates with the groove of the connecting rod to achieve fixation, and the wires can be led out through the groove of the connecting rod 211 when in use. The piezoelectric ceramic is configured as a hollow cylinder, which passes through the ultrasonic connecting rod during installation and is spaced apart from the electrode sheet. After the piezoelectric ceramic and the electrode sheet are arranged on the connecting rod, they are fastened by a fixing block and a link nut, wherein the outer diameter of the flange at the tail of the fixing block matches the inner diameter of the large cylindrical groove of the ultrasonic section of the pressure rod.

[0009] Furthermore, the modified punch is provided with an annular groove for introducing cooling water and a threaded connection hole for connecting the pressure rod transition section, and on this basis is provided with a secondary countersunk hole smaller than the threaded connection hole for connecting the amplitude rod for cooperating with the ultrasonic amplitude rod to achieve effective transmission of the ultrasonic load; the end face of the modified punch in contact with the pressure rod transition section is provided with an annular groove for installing a sealing gasket.

[0010] Furthermore, the pressure rod transition section is a connecting part for connecting the modified punch and the pressure rod ultrasonic section. The end connected to the modified punch is provided with a thread for connection, and the end face is provided with a circular ring groove for installing a sealing gasket. The end used to connect the pressure rod ultrasonic section is provided with a threaded connection hole for connection, and this end face is also provided with a circular ring groove for installing a sealing gasket; the interior of the pressure rod transition section is provided with a cylindrical through hole of equal diameter for the ultrasonic amplitude rod to pass through, and its inner diameter is larger than the diameter of the amplitude rod, and two water channels for cooling water are symmetrically provided.

[0011] Furthermore, a space for installing an ultrasonic device is provided inside the ultrasonic section of the pressure rod, including a large inner diameter cylindrical equal diameter groove for installing the ultrasonic generating device, and a small inner diameter cylindrical equal diameter through hole for the ultrasonic horn to pass through.

[0012] Furthermore, the end surface of the pressure rod transition section connecting the pressure rod ultrasonic section is provided with a groove connected to the pressure rod ultrasonic section cooling water channel. The groove is symmetrically distributed along the cross section of the cooling water channel, allowing a certain installation error.

[0013] 1. The present invention transforms the die-casting punch and pressure rod, and while ensuring their original functions and performance, applies an effective ultrasonic load to the molten metal in the pressure chamber, breaking up the coarse pre-crystallized structure in the pressure chamber, thereby achieving grain refinement and effectively improving the mechanical properties of the die-casting.

[0014] 2. The present invention cleverly innovates the design of cooling components and connections, which is conducive to the installation and stable operation of the ultrasonic device. It has a simple structure, ingenious conception, reasonable design and other advantages, and has good promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the connection between the modified punch, modified pressure rod and ultrasonic generator assembly;

[0016] Figure 2 Schematic diagram of the modified punch structure (where a2 is a schematic diagram of the modified punch end face, b2 is a schematic diagram of the modified punch connection end face, and c2 is an axial cross-sectional view of the modified punch);

[0017] Figure 3 Schematic diagram of the pressure rod transition section structure (where a3 is a schematic diagram of the connection surface between the pressure rod transition section and the modified punch, b3 is a schematic diagram of the connection surface between the pressure rod transition section and the pressure rod ultrasonic section, and c3 is an axial cross-sectional view of the pressure rod transition section);

[0018] Figure 4 Schematic diagram of the structure of the pressure rod ultrasonic section (wherein, a4 is a schematic diagram of the connection surface between the pressure rod ultrasonic section and the pressure rod transition section, b4 is a schematic diagram of the connection surface between the pressure rod ultrasonic section and the pressure rod transition section, and c4 is an axial cross-sectional view of the pressure rod ultrasonic section);

[0019] Figure 5 This is a schematic diagram of the assembly of the ultrasonic generator;

[0020] Figure 6 is a schematic diagram of a sealing gasket;

[0021] Figure 7 Schematic diagram of the application of the die-casting punch assembly of the present invention.

[0022] Among them, 101-die casting mold, 102-pressing chamber;

[0023] 201 - Modified punch, 202 - Pressure rod transition section, 203 - Pressure rod ultrasonic section, 204 - Fixing block, 205 - Connecting nut, 206 - Hydraulic pressure rod, 207 - Cooling water pipe, 208 - Power connection line, 209 - Electrode sheet, 210 - Piezoelectric ceramic, 211 - Connecting rod, 212 - Ultrasonic horn, 213 - Sealing gasket, 214 - Ultrasonic device. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to specific embodiments.

[0025] like Figure 1 As shown, the present invention provides a die-casting punch assembly with ultrasonic waves, including a modified punch 201, a pressure rod transition section 202, a pressure rod ultrasonic section 203 and an ultrasonic device 214 arranged in the pressure rod ultrasonic section 203; the ultrasonic device 214 includes an ultrasonic amplitude transformer 212 and an ultrasonic generating device; the modified punch 201 is designed with a plurality of evenly distributed step-shaped protrusions on the end face in contact with the molten metal, so as to increase the contact area between the molten metal and the modified punch 201, improve the transmission efficiency of the ultrasonic waves, and further improve the effect of the ultrasonic waves, that is, to ensure that the ultrasonic waves have a good crushing effect on the coarse dendrites formed in the pressure chamber.

[0026] Combine Figure 1 and Figure 5As can be seen, the ultrasonic generating device includes a connecting rod 211, an electrode sheet 209, a piezoelectric ceramic 210, and a fixing block 204 and a connecting nut 205 for fixing. The connecting rod 211 is provided with a thread for connecting to the ultrasonic horn 212, followed by a flange for limiting position. The connecting rod 211 body is provided with a groove for limiting and fixing the electrode sheet 209, which is connected to the hollow circular groove in the center for wiring. The electrode sheet 209 is a circular conductive sheet that cooperates with the connecting rod 211. The inner side of the ring is provided with a rectangular block for limiting position and connecting to the power supply, that is, the portion of the electrode sheet 209 that protrudes inward from the electrode ring. The piezoelectric ceramic 210 is configured as a hollow cylinder. When installed, it passes through the ultrasonic connecting rod 211 and is spaced apart from the electrode sheet 209. After the piezoelectric ceramic 210 and the electrode sheet 209 are arranged on the connecting rod 211, they are fastened by the fixing block 204 and the link nut, wherein the outer diameter of the tail flange of the fixing block 204 matches the inner diameter of the large cylindrical groove of the ultrasonic section 203 of the pressure rod.

[0027] The end face of the modified punch 201 where it contacts the pressure rod transition section 202 is provided with a circular groove for mounting a sealing gasket 213. The ultrasonic horn 212, connected to the modified punch 201, is a solid round rod of equal diameter. The end connected to the ultrasonic generator is provided with a limit flange and a connecting threaded hole. The outer diameter of the limit flange matches the inner diameter of the large inner diameter cylindrical groove of the ultrasonic section. The end face of the pressure rod transition section 202 where it connects to the pressure rod ultrasonic section 203 is provided with a groove that connects to the ultrasonic section cooling water channel. The grooves are symmetrically distributed along the cross-section of the cooling water channel, allowing for a certain degree of installation error.

[0028] It can be seen that the modification of the modified punch 201 by the present invention includes designing a number of evenly distributed step-shaped protrusions on the end face in contact with the molten metal, increasing the contact area between the molten metal and the modified punch 201, improving the transmission efficiency of the ultrasonic wave, and thus improving the effect of the ultrasonic wave, that is, ensuring that the ultrasonic wave has a good crushing effect on the coarse dendrites formed in the pressure chamber; in order to ensure the cooling effect of the die-casting punch, the present invention designs an annular groove for passing cooling water, and respectively sets a secondary countersunk hole and a threaded connection hole for connecting the ultrasonic amplitude rod 212 and the pressure rod transition section 202 in the punch; in order to ensure the sealing of the connection between the punch and the transition section, an annular groove for installing a sealing gasket 213 is set on the end face where the modified punch 201 is connected to the pressure rod transition section 202.

[0029] See also Figure 2 The modified punch 201 has a plurality of evenly distributed stepped protrusions on its end surface that contacts the molten metal. The modified punch 201 is machined with a circular groove for cooling water and a threaded connection hole for connecting the pressure rod transition section 202. On this basis, a secondary countersunk hole smaller than the threaded connection hole is provided for connecting the amplitude rod. Figure 2 、 Figure 4In order to achieve good connection and sealing between the pressure rod transition section 202 and the modified punch 201 and the pressure rod ultrasonic section 203, threads and threaded connection holes are designed at both ends for connection, and circular grooves for installing sealing gaskets 213 are also provided on both end faces. Inside the pressure rod transition section 202, in order to allow the ultrasonic horn 212 to pass through and achieve good contact with the modified punch 201, thereby achieving good ultrasonic transmission, a cylindrical through-hole of equal diameter is machined inside the pressure rod transition section 202, and its diameter is larger than that of the ultrasonic horn 212 to avoid contact with it, thereby reducing energy loss and improving the utilization efficiency of ultrasonic waves. In order to achieve the circulation of cooling water, the pressure rod transition section 202 is symmetrically provided with two water channels for cooling water, and a groove connected to the cooling water channel is machined on the end face in contact with the pressure rod ultrasonic section 203. The grooves are symmetrically distributed along the cross section of the cooling water channel, allowing a certain installation error.

[0030] See also Figure 3 The pressure rod transition section 202 is used to connect the modified punch 201 and the pressure rod ultrasonic section 203. The side connected to the modified punch 201 is provided with threads for connection, and this end face is provided with a circular groove for mounting a sealing gasket 213. The side connected to the pressure rod ultrasonic section 203 is provided with a threaded connection hole for connection, and this end face is also provided with a circular groove for mounting a sealing gasket 213. The pressure rod transition section 202 is internally provided with a cylindrical through hole of equal diameter for the ultrasonic horn 212 to pass through, and its inner diameter is larger than the horn diameter. Two water channels for cooling water are also symmetrically arranged.

[0031] See also Figure 4 The ultrasonic section 203 of the pressure rod has space inside for mounting an ultrasonic device 214. This includes a large-diameter cylindrical groove for mounting the ultrasonic generator and a small-diameter cylindrical hole for the ultrasonic horn 212. The ultrasonic section 203 is connected in the same manner as the transition section 202, with threads for connecting to the transition section and threaded holes for connecting to the hydraulic pressure rod 206. Both end surfaces are provided with annular grooves for mounting sealing gaskets. The ultrasonic section 203, like the transition section 202, is also equipped with cooling water channels and grooves. For the pressure rod ultrasonic section 203, in order to achieve good connection and sealing with the pressure rod transition section 202 and the hydraulic pressure rod 206, it has the same threaded connection and sealing groove design as the pressure rod transition section 202; at the same time, in order to achieve the circulation of cooling water, cooling water channels and grooves are also provided; a space for installing an ultrasonic generating device is provided inside the pressure rod ultrasonic section 203, which is a small cylindrical through hole for the ultrasonic amplitude rod 212 to pass through near the pressure rod transition section 202, and a cylindrical through hole with a larger inner diameter for installing the ultrasonic device 214 near the hydraulic pressure rod 206.

[0032] See also Figure 5 The ultrasonic device 214 designed in the present invention includes a connecting rod 211, an electrode sheet 209, a piezoelectric ceramic 210, and a fixing block 204 and a connecting nut 205 for fixing. The connecting rod 211 is provided with a thread for connecting to the ultrasonic horn 212, and a flange for limiting position is provided thereafter. A groove for limiting and fixing the electrode sheet 209 is provided on the connecting rod 211 body. The groove is connected to a hollow circular groove in the center for wiring. The electrode sheet 209 is a circular conductive sheet that cooperates with the connecting rod 211. A rectangular block for limiting position and connecting to a power supply is provided within the circular ring. The design of the rectangular block is based on the need for the ultrasonic device 214 to be connected to a power supply. In order to achieve the connection of the power supply and the fixation of the various components on the ultrasonic connecting rod, the electrode connecting sheet is provided with an inwardly protruding rectangular block that cooperates with the groove of the connecting rod 211 to achieve fixation. When in use, the wires can be led out through the groove of the connecting rod 211. The piezoelectric ceramic 210 is designed as a hollow cylinder and is spaced apart from the electrode sheet 209 during installation. For the installation and fixation of this device, the piezoelectric ceramic 210 and the electrode sheet 209 are arranged on the connecting rod 211 and then fastened by the fixing block 204 and the connecting nut 205. The outer diameter of the tail flange of the fixing block 204 is matched with the inner diameter of the hollow section of the ultrasonic section 203 of the pressure rod, ensuring that no unnecessary vibration is generated during operation, thereby improving the working efficiency and accuracy of the ultrasonic device 214.

[0033] Combine Figure 7 and Figure 1 It can be seen that the working principle and process of the present invention are as follows: before pouring the molten metal into the pressure chamber 102, it is necessary to first turn on the cooling water switch so that the cooling water flows into the modified punch 201 through the cooling water pipe 207 and the cooling water channel set in the pressure rod ultrasonic section 203 and the pressure rod transition section 202, and forms a circulation to ensure the cooling of the die-casting modified punch 201 and prevent the ultrasonic device 214 from overheating; thereafter, the control switch of the ultrasonic device 214 is turned on to put it in the working state, and ultrasonic load is applied to the modified punch 201 according to the pre-set frequency and power. After the state is normal, the molten metal is poured into the pressure chamber 102. At this time, the molten metal contacts the pressure chamber 102 and the modified punch 201 at room temperature, and the temperature drops rapidly. The quenching causes the rapidly cooled molten metal to begin to nucleate, crystallize and grow. However, in this process, the dendrites are broken due to the cavitation effect of the ultrasonic wave on the molten metal and the acoustic flow effect, and it cannot form coarse dendrites. As the die-casting machine starts die-casting according to the preset instructions, the pressure rod pushes the punch to hydraulically press the metal into the cavity of the mold 101, rapidly cooling and solidifying it, thereby forming a casting with almost no pre-crystallized structure in the pressure chamber and fine and uniform internal grains. This casting has better mechanical properties than ordinary die-casting.

[0034] To address the problem of molten metal nucleating and growing within the die-casting chamber, forming a pre-crystallized structure in the die-casting chamber and thus reducing the mechanical properties of the casting, this invention proposes modifying the die-casting machine punch and die-casting rod and adding an ultrasonic generator to apply ultrasonic loads to the molten metal within the die-casting chamber. The ultrasonic wave generates cavitation within the molten metal and acts as a sonic stream to break up the coarse pre-crystallized structure in the die-casting chamber, thereby refining the grain size and improving the mechanical properties of the die-casting.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A die-casting punch assembly with ultrasonic, characterized in that, The modified punch comprises a modified punch head, a pressure rod transition section, and a pressure rod ultrasonic section; an ultrasonic device is provided inside the pressure rod ultrasonic section, and the ultrasonic device comprises an ultrasonic amplitude transformer and an ultrasonic generator; the modified punch head is designed with a number of evenly distributed step-shaped protrusions on the end surface in contact with the molten metal, which increases the contact area between the molten metal and the modified punch head, improves the transmission efficiency of the ultrasonic wave, and ensures that the ultrasonic wave has a good crushing effect on the coarse dendrites formed in the pressure chamber; The ultrasonic generating device includes a connecting rod, an electrode sheet, a piezoelectric ceramic, and a fixing block and a connecting nut for fixing; the connecting rod is provided with a thread for connecting to the amplitude rod, and a flange for limiting is provided thereafter, and a groove for limiting and fixing the electrode sheet is provided on the connecting rod body, and the groove is connected to the hollow circular groove in the center for routing; the electrode sheet is a circular conductive sheet that matches the connecting rod, and a rectangular block for limiting and connecting the power supply is provided on the inner side of the circular ring, that is, the part of the electrode circular ring protruding inward; the piezoelectric ceramic is set as a hollow cylinder, which passes through the ultrasonic connecting rod during installation and is arranged at intervals with the electrode sheet; after the piezoelectric ceramic and the electrode sheet are arranged on the connecting rod, they are fastened by a fixing block and a link nut, wherein the outer diameter of the flange at the tail of the fixing block matches the inner diameter of the large cylindrical groove of the ultrasonic section of the pressure rod; The end surface of the pressure rod transition section connecting to the pressure rod ultrasonic section is provided with a groove connected to the ultrasonic section cooling water channel, and the groove is symmetrically distributed along the cross section of the cooling water channel; The connection method of the pressure rod ultrasonic section is consistent with that of the pressure rod transition section, and they are respectively provided with threads for connecting with the pressure rod transition section and threaded holes for connecting with the hydraulic pressure rod. Both end faces are provided with annular grooves for installing sealing gaskets; the pressure rod ultrasonic section is consistent with the pressure rod transition section, and is provided with a cooling water channel and a groove.

2. The ultrasonic die-casting punch assembly according to claim 1, characterized in that: The modified punch is provided with an annular groove for introducing cooling water and a threaded connection hole for connecting the pressure rod transition section, and on this basis is provided with a secondary countersunk hole smaller than the threaded connection hole for connecting the amplitude rod; the end face of the modified punch in contact with the pressure rod transition section is provided with an annular groove for installing a sealing gasket.

3. The ultrasonic die-casting punch assembly according to claim 1, characterized in that: The pressure rod transition section is a connecting part for connecting the modified punch and the pressure rod ultrasonic section. The end connected to the modified punch is provided with a thread for connection, and the end face is provided with a circular ring groove for installing a sealing gasket. The end used to connect the pressure rod ultrasonic section is provided with a threaded connection hole for connection, and this end face is also provided with a circular ring groove for installing a sealing gasket; the interior of the pressure rod transition section is provided with a cylindrical through hole of equal diameter for the ultrasonic amplitude rod to pass through, and its inner diameter is larger than the diameter of the amplitude rod, and two water channels for cooling water are symmetrically provided.

4. The ultrasonic die-casting punch assembly according to claim 1, characterized in that: The ultrasonic section of the pressure rod is provided with a space for installing an ultrasonic device, including a large inner diameter cylindrical equal diameter groove for installing the ultrasonic generator and a small inner diameter cylindrical equal diameter through hole for the ultrasonic horn to pass through.

5. The ultrasonic die-casting punch assembly according to claim 1, characterized in that: The end of the ultrasonic horn connected to the modified punch is a solid round rod of equal diameter, and the end connected to the ultrasonic generating device is provided with a limiting flange and a connecting threaded hole, wherein the outer diameter of the limiting flange matches the inner diameter of the large inner diameter cylindrical groove of the ultrasonic section.

6. The ultrasonic die-casting punch assembly according to claim 1, characterized in that: After the piezoelectric ceramics and electrode sheets are arranged on the connecting rod, they are fastened by a fixing block and a link nut, wherein the outer diameter of the flange at the tail of the fixing block matches the inner diameter of the large cylindrical groove of the ultrasonic section of the pressure rod.

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