Auxiliary positioning and connecting device for machining bolt hole of marine diesel engine body

Abstract

The auxiliary positioning and connecting device for machining the marine diesel engine body bolt hole comprises a screw tap extension rod used for connecting a screw tap and a drilling machine and a positioning sleeve used for limiting deflection of the screw tap extension rod when an internal thread section of the bolt hole is machined, and the upper end of the screw tap extension rod is connected with a tapping cutter handle of the drilling machine. The lower end of the screw tap extension rod is connected with the upper end of the screw tap in a matched mode, the positioning sleeve is matched with the opening position of the upper end of the unthreaded hole, and the screw tap penetrating out of the positioning sleeve is driven by the tapping cutter handle to coaxially machine a threaded hole along the bottom of the unthreaded hole under the anti-deviation guiding effect of the positioning sleeve on the screw tap extension rod. The positioning sleeve is arranged at the hole opening position of the machined unthreaded hole, the screw tap and the drilling machine are connected through the screw tap extension rod, the screw tap coaxially machines the threaded hole along the hole bottom of the unthreaded hole in the state that the screw tap extension rod is matched with the positioning sleeve, the quality problem that the perpendicularity of a bolt hole is out of tolerance in a traditional machining mode is solved, the perpendicularity requirement of the bolt hole is met, and the machining efficiency is improved. The processing quality of products is improved, and smooth production is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine body bolt hole processing, and in particular relates to an auxiliary positioning and connecting device for processing the bolt holes of a marine diesel engine body. Background Art

[0002] Marine diesel engines have the characteristics of high thermal efficiency, good economy, easy starting, and great adaptability to various types of ships. They are widely used in ship propulsion power plants and ship power stations. The fuselage of a marine diesel engine is one of the key components of a diesel engine and also the base of the diesel engine. All fixed and moving parts are installed on it through bolt connections. Among them, the main bearing bolt hole and cylinder head bolt hole of the diesel engine fuselage are the key bolt holes of the fuselage. The bolt hole structure is a step hole, that is, the lower part is a threaded hole and the upper part is a light hole. The bolt hole thread diameter is above M36, and the verticality requirement is 0.20 / 100. The traditional economic processing method is to pre-drill with a gantry boring and milling machine first, and then tap with a drilling machine. However, due to the large flexibility of the drilling machine, the verticality of the main bearing bolt hole and the cylinder head bolt hole is out of tolerance. The length of the main bearing bolt and cylinder head bolt of a marine diesel engine is about 1000mm. The verticality of the main bearing bolt hole and the cylinder head bolt hole will directly affect the installation of the main bearing cover and the cylinder head, causing interference. During the tapping process of key bolt holes, the verticality of the thread is mainly guaranteed by the accuracy of the drilling machine. However, as the equipment is used for longer and longer, the accuracy of the drilling machine decreases. At this time, it is impossible to perform accuracy compensation like a CNC machine tool. This system error directly affects the processing accuracy of the key bolt holes of the fuselage, and the processing quality is unstable, resulting in the main bearing cover and cylinder head cannot be installed smoothly, affecting the production progress. Therefore, it is necessary to make improvements to the above problems. Summary of the invention

[0003] The technical problem solved by the present invention is as follows: an auxiliary positioning and connecting device for processing bolt holes in a marine diesel engine fuselage is provided, by arranging a positioning sleeve at the position of the processed light hole mouth, and connecting the tap and the drilling machine by a tap extension rod, and processing the threaded hole coaxially along the bottom of the light hole by the tap when the tap extension rod and the positioning sleeve are adapted, thereby solving the quality problem of excessive verticality of the bolt hole under the traditional processing method, ensuring the verticality requirement of the bolt hole, improving the processing quality of the product, and ensuring smooth production.

[0004] The technical solution adopted by the present invention is: an auxiliary positioning and connecting device for processing bolt holes in a marine diesel engine body, comprising a tap extension rod for connecting a tap and a drilling machine and a positioning sleeve for limiting the deflection of the tap extension rod when processing the threaded section in the bolt hole, the upper end of the tap extension rod is connected to the tapping tool handle of the drilling machine, and the lower end of the tap extension rod is adaptively connected to the upper end of the tap, the positioning sleeve is adapted to the position of the upper end of the light hole, and the tap that passes through the positioning sleeve is driven by the tapping tool handle to coaxially process the threaded hole along the bottom of the light hole under the anti-deflection guiding action of the positioning sleeve on the tap extension rod.

[0005] Wherein, the positioning sleeve is a T-shaped sleeve, the small diameter section at the lower end of the positioning sleeve is adapted to the upper end of the light hole, and the step surface formed by the large diameter section and the small diameter section of the positioning sleeve is in contact with the plane on the fuselage at the position of the light hole opening for positioning.

[0006] Furthermore, a plurality of shallow grooves are evenly distributed on the circumference of the inner hole wall of the positioning sleeve and are parallel to the axial direction thereof and are used to guide cutting fluid or cutting oil.

[0007] Furthermore, the positioning sleeve is a two-petal splicing structure, and a plurality of V-shaped shallow grooves are evenly distributed on the circumference of the inner hole wall of the positioning sleeve.

[0008] Furthermore, the positioning sleeve is made of high-quality carbon structural steel after quenching and tempering.

[0009] Furthermore, the tap extension rod is made of CrMo steel through heat treatment, and the heat treatment hardness of the tap extension rod is 40-45HRC.

[0010] Furthermore, the tap extension rod includes a connecting guide section at the lower end, a stepped connecting section at the upper end, and an extended section connected to the connecting guide section and the stepped connecting section as a whole; the lower end surface of the connecting guide section is provided with a square hole adapted to be connected to the square column at the upper end of the tap, and the top screw threadedly connected to the connecting guide section through a countersunk screw hole is tightened in the annular groove at the upper end of the tap; the square column at the upper end of the stepped connecting section is adapted to be connected to the bed tapping tool handle.

[0011] The advantages of the present invention compared with the prior art are:

[0012] 1. This technical solution solves the quality problem of excessive verticality of bolt holes in traditional processing methods by setting a positioning sleeve at the opening of the processed light hole and connecting the tap and the drilling machine with a tap extension rod. When the tap extension rod and the positioning sleeve are matched, the tap processes the threaded hole coaxially along the bottom of the light hole. It provides guiding conditions for the tap extension rod to prevent swing during threaded section processing, ensures the stability and reliability of the tap when processing the threaded hole at the bottom of the light hole, and thus ensures the verticality requirements of the bolt hole.

[0013] 2. This technical solution processes a shallow groove on the inner hole wall of the positioning sleeve for guiding cutting fluid or cutting oil. Cutting fluid or cutting oil can be added during tapping to ensure sufficient lubrication;

[0014] 3. This technical solution has a simple structure, novel design, low cost, stable and reliable positioning and guiding, reduces the difficulty of bolt hole processing, improves the verticality accuracy of bolt holes, improves the processing quality of products, and ensures smooth production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the use state of the present invention;

[0016] Figure 2 A schematic diagram of the structure of the two-piece positioning sleeve of the present invention after being spliced;

[0017] Figure 3 Schematic diagram of bolt hole center deviation. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention Figure 1-3 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that, in this document, unless otherwise stated, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc., are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations. The elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0021] Auxiliary positioning and connection device for processing bolt holes in marine diesel engine fuselage, such as Figure 1-3As shown, it includes a tap extension rod 1 for connecting a tap 3 to a drilling machine and a positioning sleeve 2 for limiting the deflection of the tap extension rod 1 when processing the threaded section in the bolt hole. The upper end of the tap extension rod 1 is connected to the tapping handle of the drilling machine, and the lower end of the tap extension rod 1 is adaptively connected to the upper end of the tap 3. The positioning sleeve 2 is adapted to the position of the upper end of the light hole 4. The tap 3 passing through the positioning sleeve 2 is driven by the tapping handle to coaxially process the thread along the bottom of the light hole 4 under the anti-deflection guiding action of the positioning sleeve 2 on the tap extension rod 1. Hole; In the above structure, by setting a positioning sleeve 2 at the opening of the light hole 4 to be processed, and connecting the tap 3 and the drilling machine by the tap extension rod 1, the tap 3 is used to coaxially process the threaded hole along the bottom of the light hole 4 when the tap extension rod 1 and the positioning sleeve 2 are adapted, which solves the quality problem of excessive verticality of the bolt hole in the traditional processing method, provides a guiding condition for the tap extension rod 1 to prevent swing during the processing of the threaded section, ensures the stability and reliability of the tap when processing the threaded hole at the bottom of the light hole 4, and thus ensures the verticality requirement of the bolt hole;

[0022] like Figure 1-2 As shown, the specific structure of the positioning sleeve 2 is as follows: the positioning sleeve 2 is a T-shaped sleeve, the small diameter section at the lower end of the positioning sleeve 2 is adapted to the upper end of the light hole 4, and the step surface formed by the large diameter section and the small diameter section of the positioning sleeve 2 is in contact with the plane on the body of the light hole 4 at the opening of the light hole 4 for positioning; specifically, a plurality of shallow grooves 5 are evenly distributed on the circumference of the inner hole wall of the positioning sleeve 2 and are parallel to the axial direction thereof and are used to guide cutting fluid or cutting oil, so as to facilitate lubrication of the tap; specifically, as Figure 2 As shown, in order to facilitate the installation of the positioning sleeve 2, the positioning sleeve 2 can be designed as a two-petal splicing structure, and a plurality of V-shaped shallow grooves 5 are evenly distributed on the circumference of the inner hole wall of the positioning sleeve 2; in the above structure, by processing the shallow grooves 5 for guiding cutting fluid or cutting oil on the inner hole wall of the positioning sleeve 2, cutting fluid or cutting oil can be added during tapping to ensure sufficient lubrication;

[0023] The positioning sleeve 2 is made of high-quality carbon structural steel after quenching and tempering. Specifically, the tap extension rod 1 is made of 42CrMo steel after heat treatment, and the heat treatment hardness of the tap extension rod 1 is 40-45HRC.

[0024] The specific structure of the tap extension rod 1 is as follows: the tap extension rod 1 includes a connecting guide section 1-1 at the lower end, a stepped connecting section 1-3 at the upper end, and an extension section 1-2 connected to the connecting guide section 1-1 and the stepped connecting section 1-3 as a whole. The lower end surface of the connecting guide section 1-1 is provided with a square hole adapted to be connected to the square column at the upper end of the tap 3, and the top screw threadedly connected to the connecting guide section 1-1 through a countersunk screw hole is pressed against the annular groove at the upper end of the tap 3. The square column at the upper end of the stepped connecting section 1-3 is adapted to be connected to the bed tapping tool handle. In the above structure, the tap 3 When processing the threaded hole from the bottom of the light hole 4, the connecting guide section 1-1 cooperates with the center hole of the positioning sleeve 2, and the cooperation clearance is selected to be 0.2-0.25mm. Moreover, the length of the connecting guide section 1-1 is greater than the length of the positioning sleeve 2, and at the same time greater than the processing depth of the threaded hole, thereby ensuring that the positioning sleeve 2 always cooperates with the connecting guide section 1-1 before and after the threaded hole processing, ensuring the verticality requirement of the threaded hole processing, and the positioning sleeve 2 that cooperates with the tap extension rod 1 and the light hole 4 of the bolt hole limits the swing position of the tap extension rod 1 during tapping, and well ensures the verticality of the bolt hole.

[0025] According to the structural characteristics of the fuselage bolt hole, the tap extension rod 1 and the positioning sleeve 2 are designed. The tap extension rod 1 is used to connect the tap 3 and the drilling machine, and the positioning sleeve 2 is used to limit the deflection of the tap extension rod 1 during thread processing. Design principle: The design center deviation is less than the theoretical center deviation δ, which can ensure the verticality requirements of the screw hole in the drawing. Figure 3 As shown, the bolt hole design center deviation = the fitting clearance between the tap extension rod 1 and the positioning sleeve 2 / 2+the fitting clearance between the positioning sleeve 2 and the bolt hole / 2<δ; generally, for the convenience of operation, each fitting clearance is selected to be 0.2~0.25mm, the orifice size of the fuselage bolt hole is controlled according to the outer diameter size of the positioning sleeve 2, and the inner hole size of the positioning sleeve 2 (to ensure that the sleeve wall thickness is ≥4mm) is determined according to the size of the positioning part of the tap extension rod 1 (i.e., the connecting guide section 1-1) to meet the fitting clearance requirements; for the convenience of installation, the positioning sleeve 2 can be cut into two parts from the center position, and the inner hole wall of the positioning sleeve 2 should be processed with a shallow groove 5 of a V-shaped structure, and cutting fluid or cutting oil can be added during tapping to ensure sufficient lubrication. The material of the positioning sleeve 2 is 45GB / T699, quenched and tempered; the material of the tap extension rod is 42CrMoGB / T3077, heat-treated with a hardness of 40-45HRC. The chip removal can be carried out by setting an axial center hole on the tap extension rod 1, which is the same as the chip removal method of the tap extension rod originally designed by our company, and will not be elaborated here.

[0026] The technical solution has a simple structure, novel design, low cost, stable and reliable positioning and guiding, reduces the difficulty of bolt hole processing, improves the verticality accuracy of the bolt hole, improves the processing quality of the product, and ensures smooth production.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An auxiliary positioning and connecting device for processing bolt holes of a marine diesel engine body, characterized in that: The invention comprises a tap extension rod (1) for connecting a tap (3) to a drilling machine and a positioning sleeve (2) for allowing the tap (3) to pass smoothly and limiting the deflection of the tap extension rod (1) when processing the threaded section in a bolt hole; the upper end of the tap extension rod (1) is connected to a tapping handle of the drilling machine, and the lower end of the tap extension rod (1) is adaptively connected to the upper end of the tap (3) so that the tap (3) rotates along with the rotation of the tap extension rod (1); the positioning sleeve (2) is axially positioned and adapted to the position of the upper end of the light hole (4); and the tap (3) passing through the positioning sleeve (2) is driven by the tapping handle to coaxially process the threaded hole along the bottom of the light hole (4) under the anti-deflection guiding action of the positioning sleeve (2) on the tap extension rod (1).

2. The auxiliary positioning and connecting device for machining bolt holes of a marine diesel engine body according to claim 1, characterized in that: The positioning sleeve (2) is a T-shaped sleeve, the small diameter section at the lower end of the positioning sleeve (2) is adapted to fit the upper end of the light hole (4), and the step surface formed by the large diameter section and the small diameter section of the positioning sleeve (2) contacts and positions the upper plane of the fuselage at the opening of the light hole (4).

3. The auxiliary positioning and connecting device for machining bolt holes of a marine diesel engine body according to claim 2, characterized in that: A plurality of shallow grooves (5) are evenly distributed on the circumference of the inner hole wall of the positioning sleeve (2) and are parallel to the axial direction thereof and are used to guide cutting fluid or cutting oil.

4. The auxiliary positioning and connecting device for machining bolt holes of a marine diesel engine body according to claim 3, characterized in that: The positioning sleeve (2) is a two-petal spliced ​​structure, and a plurality of V-shaped shallow grooves (5) are evenly distributed on the circumference of the inner hole wall of the positioning sleeve (2).

5. The auxiliary positioning and connecting device for machining bolt holes of a marine diesel engine body according to claim 1, characterized in that: The positioning sleeve (2) is made of high-quality carbon structural steel after quenching and tempering.

6. The auxiliary positioning and connecting device for machining bolt holes of a marine diesel engine body according to claim 1, characterized in that: The tap extension rod (1) is made of 42CrMo steel through heat treatment, and the heat treatment hardness of the tap extension rod (1) is 40-45HRC.

7. The auxiliary positioning and connecting device for machining bolt holes in a marine diesel engine body according to any one of claims 1 to 6, characterized in that: The tap extension rod (1) comprises a connecting guide section (1-1) at the lower end, a stepped connecting section (1-3) at the upper end, and an extension section (1-2) connected to the connecting guide section (1-1) and the stepped connecting section (1-3) as a whole; a square hole adapted to be connected to a square column at the upper end of the tap (3) is formed on the lower end surface of the connecting guide section (1-1); a top screw threadedly connected to the connecting guide section (1-1) through a countersunk screw hole is pressed against a ring groove at the upper end of the tap (3); and the square column at the upper end of the stepped connecting section (1-3) is adapted to be connected to a bed tapping tool handle.

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